| File: | dev/pci/drm/drm_dp_mst_topology.c |
| Warning: | line 3284, column 2 Value stored to 'len' is never read |
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| 1 | /* |
| 2 | * Copyright © 2014 Red Hat |
| 3 | * |
| 4 | * Permission to use, copy, modify, distribute, and sell this software and its |
| 5 | * documentation for any purpose is hereby granted without fee, provided that |
| 6 | * the above copyright notice appear in all copies and that both that copyright |
| 7 | * notice and this permission notice appear in supporting documentation, and |
| 8 | * that the name of the copyright holders not be used in advertising or |
| 9 | * publicity pertaining to distribution of the software without specific, |
| 10 | * written prior permission. The copyright holders make no representations |
| 11 | * about the suitability of this software for any purpose. It is provided "as |
| 12 | * is" without express or implied warranty. |
| 13 | * |
| 14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| 15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| 16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| 17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
| 18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| 20 | * OF THIS SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/bitfield.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/i2c.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/random.h> |
| 30 | #include <linux/sched.h> |
| 31 | #include <linux/seq_file.h> |
| 32 | #include <linux/iopoll.h> |
| 33 | |
| 34 | #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)0 |
| 35 | #include <linux/stacktrace.h> |
| 36 | #include <linux/sort.h> |
| 37 | #include <linux/timekeeping.h> |
| 38 | #include <linux/math64.h> |
| 39 | #endif |
| 40 | |
| 41 | #include <drm/drm_atomic.h> |
| 42 | #include <drm/drm_atomic_helper.h> |
| 43 | #include <drm/drm_dp_mst_helper.h> |
| 44 | #include <drm/drm_drv.h> |
| 45 | #include <drm/drm_print.h> |
| 46 | #include <drm/drm_probe_helper.h> |
| 47 | |
| 48 | #include "drm_crtc_helper_internal.h" |
| 49 | #include "drm_dp_mst_topology_internal.h" |
| 50 | |
| 51 | /** |
| 52 | * DOC: dp mst helper |
| 53 | * |
| 54 | * These functions contain parts of the DisplayPort 1.2a MultiStream Transport |
| 55 | * protocol. The helpers contain a topology manager and bandwidth manager. |
| 56 | * The helpers encapsulate the sending and received of sideband msgs. |
| 57 | */ |
| 58 | struct drm_dp_pending_up_req { |
| 59 | struct drm_dp_sideband_msg_hdr hdr; |
| 60 | struct drm_dp_sideband_msg_req_body msg; |
| 61 | struct list_head next; |
| 62 | }; |
| 63 | |
| 64 | static bool_Bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
| 65 | char *buf); |
| 66 | |
| 67 | static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port); |
| 68 | |
| 69 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, |
| 70 | int id, |
| 71 | struct drm_dp_payload *payload); |
| 72 | |
| 73 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, |
| 74 | struct drm_dp_mst_port *port, |
| 75 | int offset, int size, u8 *bytes); |
| 76 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
| 77 | struct drm_dp_mst_port *port, |
| 78 | int offset, int size, u8 *bytes); |
| 79 | |
| 80 | static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
| 81 | struct drm_dp_mst_branch *mstb); |
| 82 | |
| 83 | static void |
| 84 | drm_dp_send_clear_payload_id_table(struct drm_dp_mst_topology_mgr *mgr, |
| 85 | struct drm_dp_mst_branch *mstb); |
| 86 | |
| 87 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
| 88 | struct drm_dp_mst_branch *mstb, |
| 89 | struct drm_dp_mst_port *port); |
| 90 | static bool_Bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, |
| 91 | u8 *guid); |
| 92 | |
| 93 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_mst_port *port); |
| 94 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_mst_port *port); |
| 95 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); |
| 96 | |
| 97 | static bool_Bool drm_dp_mst_port_downstream_of_branch(struct drm_dp_mst_port *port, |
| 98 | struct drm_dp_mst_branch *branch); |
| 99 | |
| 100 | #define DBG_PREFIX"[dp_mst]" "[dp_mst]" |
| 101 | |
| 102 | #define DP_STR(x)[DRM_DP_SIDEBAND_TX_x] = "x" [DP_ ## x] = #x |
| 103 | |
| 104 | static const char *drm_dp_mst_req_type_str(u8 req_type) |
| 105 | { |
| 106 | static const char * const req_type_str[] = { |
| 107 | DP_STR(GET_MSG_TRANSACTION_VERSION)[DRM_DP_SIDEBAND_TX_GET_MSG_TRANSACTION_VERSION] = "GET_MSG_TRANSACTION_VERSION", |
| 108 | DP_STR(LINK_ADDRESS)[DRM_DP_SIDEBAND_TX_LINK_ADDRESS] = "LINK_ADDRESS", |
| 109 | DP_STR(CONNECTION_STATUS_NOTIFY)[DRM_DP_SIDEBAND_TX_CONNECTION_STATUS_NOTIFY] = "CONNECTION_STATUS_NOTIFY", |
| 110 | DP_STR(ENUM_PATH_RESOURCES)[DRM_DP_SIDEBAND_TX_ENUM_PATH_RESOURCES] = "ENUM_PATH_RESOURCES", |
| 111 | DP_STR(ALLOCATE_PAYLOAD)[DRM_DP_SIDEBAND_TX_ALLOCATE_PAYLOAD] = "ALLOCATE_PAYLOAD", |
| 112 | DP_STR(QUERY_PAYLOAD)[DRM_DP_SIDEBAND_TX_QUERY_PAYLOAD] = "QUERY_PAYLOAD", |
| 113 | DP_STR(RESOURCE_STATUS_NOTIFY)[DRM_DP_SIDEBAND_TX_RESOURCE_STATUS_NOTIFY] = "RESOURCE_STATUS_NOTIFY", |
| 114 | DP_STR(CLEAR_PAYLOAD_ID_TABLE)[DRM_DP_SIDEBAND_TX_CLEAR_PAYLOAD_ID_TABLE] = "CLEAR_PAYLOAD_ID_TABLE", |
| 115 | DP_STR(REMOTE_DPCD_READ)[DRM_DP_SIDEBAND_TX_REMOTE_DPCD_READ] = "REMOTE_DPCD_READ", |
| 116 | DP_STR(REMOTE_DPCD_WRITE)[DRM_DP_SIDEBAND_TX_REMOTE_DPCD_WRITE] = "REMOTE_DPCD_WRITE", |
| 117 | DP_STR(REMOTE_I2C_READ)[DRM_DP_SIDEBAND_TX_REMOTE_I2C_READ] = "REMOTE_I2C_READ", |
| 118 | DP_STR(REMOTE_I2C_WRITE)[DRM_DP_SIDEBAND_TX_REMOTE_I2C_WRITE] = "REMOTE_I2C_WRITE", |
| 119 | DP_STR(POWER_UP_PHY)[DRM_DP_SIDEBAND_TX_POWER_UP_PHY] = "POWER_UP_PHY", |
| 120 | DP_STR(POWER_DOWN_PHY)[DRM_DP_SIDEBAND_TX_POWER_DOWN_PHY] = "POWER_DOWN_PHY", |
| 121 | DP_STR(SINK_EVENT_NOTIFY)[DRM_DP_SIDEBAND_TX_SINK_EVENT_NOTIFY] = "SINK_EVENT_NOTIFY", |
| 122 | DP_STR(QUERY_STREAM_ENC_STATUS)[DRM_DP_SIDEBAND_TX_QUERY_STREAM_ENC_STATUS] = "QUERY_STREAM_ENC_STATUS", |
| 123 | }; |
| 124 | |
| 125 | if (req_type >= ARRAY_SIZE(req_type_str)(sizeof((req_type_str)) / sizeof((req_type_str)[0])) || |
| 126 | !req_type_str[req_type]) |
| 127 | return "unknown"; |
| 128 | |
| 129 | return req_type_str[req_type]; |
| 130 | } |
| 131 | |
| 132 | #undef DP_STR |
| 133 | #define DP_STR(x)[DRM_DP_SIDEBAND_TX_x] = "x" [DP_NAK_ ## x] = #x |
| 134 | |
| 135 | static const char *drm_dp_mst_nak_reason_str(u8 nak_reason) |
| 136 | { |
| 137 | static const char * const nak_reason_str[] = { |
| 138 | DP_STR(WRITE_FAILURE)[DRM_DP_SIDEBAND_TX_WRITE_FAILURE] = "WRITE_FAILURE", |
| 139 | DP_STR(INVALID_READ)[DRM_DP_SIDEBAND_TX_INVALID_READ] = "INVALID_READ", |
| 140 | DP_STR(CRC_FAILURE)[DRM_DP_SIDEBAND_TX_CRC_FAILURE] = "CRC_FAILURE", |
| 141 | DP_STR(BAD_PARAM)[DRM_DP_SIDEBAND_TX_BAD_PARAM] = "BAD_PARAM", |
| 142 | DP_STR(DEFER)[DRM_DP_SIDEBAND_TX_DEFER] = "DEFER", |
| 143 | DP_STR(LINK_FAILURE)[DRM_DP_SIDEBAND_TX_LINK_FAILURE] = "LINK_FAILURE", |
| 144 | DP_STR(NO_RESOURCES)[DRM_DP_SIDEBAND_TX_NO_RESOURCES] = "NO_RESOURCES", |
| 145 | DP_STR(DPCD_FAIL)[DRM_DP_SIDEBAND_TX_DPCD_FAIL] = "DPCD_FAIL", |
| 146 | DP_STR(I2C_NAK)[DRM_DP_SIDEBAND_TX_I2C_NAK] = "I2C_NAK", |
| 147 | DP_STR(ALLOCATE_FAIL)[DRM_DP_SIDEBAND_TX_ALLOCATE_FAIL] = "ALLOCATE_FAIL", |
| 148 | }; |
| 149 | |
| 150 | if (nak_reason >= ARRAY_SIZE(nak_reason_str)(sizeof((nak_reason_str)) / sizeof((nak_reason_str)[0])) || |
| 151 | !nak_reason_str[nak_reason]) |
| 152 | return "unknown"; |
| 153 | |
| 154 | return nak_reason_str[nak_reason]; |
| 155 | } |
| 156 | |
| 157 | #undef DP_STR |
| 158 | #define DP_STR(x)[DRM_DP_SIDEBAND_TX_x] = "x" [DRM_DP_SIDEBAND_TX_ ## x] = #x |
| 159 | |
| 160 | static const char *drm_dp_mst_sideband_tx_state_str(int state) |
| 161 | { |
| 162 | static const char * const sideband_reason_str[] = { |
| 163 | DP_STR(QUEUED)[0] = "QUEUED", |
| 164 | DP_STR(START_SEND)[1] = "START_SEND", |
| 165 | DP_STR(SENT)[2] = "SENT", |
| 166 | DP_STR(RX)[3] = "RX", |
| 167 | DP_STR(TIMEOUT)[4] = "TIMEOUT", |
| 168 | }; |
| 169 | |
| 170 | if (state >= ARRAY_SIZE(sideband_reason_str)(sizeof((sideband_reason_str)) / sizeof((sideband_reason_str) [0])) || |
| 171 | !sideband_reason_str[state]) |
| 172 | return "unknown"; |
| 173 | |
| 174 | return sideband_reason_str[state]; |
| 175 | } |
| 176 | |
| 177 | static int |
| 178 | drm_dp_mst_rad_to_str(const u8 rad[8], u8 lct, char *out, size_t len) |
| 179 | { |
| 180 | int i; |
| 181 | u8 unpacked_rad[16]; |
| 182 | |
| 183 | for (i = 0; i < lct; i++) { |
| 184 | if (i % 2) |
| 185 | unpacked_rad[i] = rad[i / 2] >> 4; |
| 186 | else |
| 187 | unpacked_rad[i] = rad[i / 2] & BIT_MASK(4)(1UL << ((4) % 64)); |
| 188 | } |
| 189 | |
| 190 | /* TODO: Eventually add something to printk so we can format the rad |
| 191 | * like this: 1.2.3 |
| 192 | */ |
| 193 | return snprintf(out, len, "%*phC", lct, unpacked_rad); |
| 194 | } |
| 195 | |
| 196 | /* sideband msg handling */ |
| 197 | static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) |
| 198 | { |
| 199 | u8 bitmask = 0x80; |
| 200 | u8 bitshift = 7; |
| 201 | u8 array_index = 0; |
| 202 | int number_of_bits = num_nibbles * 4; |
| 203 | u8 remainder = 0; |
| 204 | |
| 205 | while (number_of_bits != 0) { |
| 206 | number_of_bits--; |
| 207 | remainder <<= 1; |
| 208 | remainder |= (data[array_index] & bitmask) >> bitshift; |
| 209 | bitmask >>= 1; |
| 210 | bitshift--; |
| 211 | if (bitmask == 0) { |
| 212 | bitmask = 0x80; |
| 213 | bitshift = 7; |
| 214 | array_index++; |
| 215 | } |
| 216 | if ((remainder & 0x10) == 0x10) |
| 217 | remainder ^= 0x13; |
| 218 | } |
| 219 | |
| 220 | number_of_bits = 4; |
| 221 | while (number_of_bits != 0) { |
| 222 | number_of_bits--; |
| 223 | remainder <<= 1; |
| 224 | if ((remainder & 0x10) != 0) |
| 225 | remainder ^= 0x13; |
| 226 | } |
| 227 | |
| 228 | return remainder; |
| 229 | } |
| 230 | |
| 231 | static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) |
| 232 | { |
| 233 | u8 bitmask = 0x80; |
| 234 | u8 bitshift = 7; |
| 235 | u8 array_index = 0; |
| 236 | int number_of_bits = number_of_bytes * 8; |
| 237 | u16 remainder = 0; |
| 238 | |
| 239 | while (number_of_bits != 0) { |
| 240 | number_of_bits--; |
| 241 | remainder <<= 1; |
| 242 | remainder |= (data[array_index] & bitmask) >> bitshift; |
| 243 | bitmask >>= 1; |
| 244 | bitshift--; |
| 245 | if (bitmask == 0) { |
| 246 | bitmask = 0x80; |
| 247 | bitshift = 7; |
| 248 | array_index++; |
| 249 | } |
| 250 | if ((remainder & 0x100) == 0x100) |
| 251 | remainder ^= 0xd5; |
| 252 | } |
| 253 | |
| 254 | number_of_bits = 8; |
| 255 | while (number_of_bits != 0) { |
| 256 | number_of_bits--; |
| 257 | remainder <<= 1; |
| 258 | if ((remainder & 0x100) != 0) |
| 259 | remainder ^= 0xd5; |
| 260 | } |
| 261 | |
| 262 | return remainder & 0xff; |
| 263 | } |
| 264 | static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) |
| 265 | { |
| 266 | u8 size = 3; |
| 267 | |
| 268 | size += (hdr->lct / 2); |
| 269 | return size; |
| 270 | } |
| 271 | |
| 272 | static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, |
| 273 | u8 *buf, int *len) |
| 274 | { |
| 275 | int idx = 0; |
| 276 | int i; |
| 277 | u8 crc4; |
| 278 | |
| 279 | buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); |
| 280 | for (i = 0; i < (hdr->lct / 2); i++) |
| 281 | buf[idx++] = hdr->rad[i]; |
| 282 | buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | |
| 283 | (hdr->msg_len & 0x3f); |
| 284 | buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); |
| 285 | |
| 286 | crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); |
| 287 | buf[idx - 1] |= (crc4 & 0xf); |
| 288 | |
| 289 | *len = idx; |
| 290 | } |
| 291 | |
| 292 | static bool_Bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, |
| 293 | u8 *buf, int buflen, u8 *hdrlen) |
| 294 | { |
| 295 | u8 crc4; |
| 296 | u8 len; |
| 297 | int i; |
| 298 | u8 idx; |
| 299 | |
| 300 | if (buf[0] == 0) |
| 301 | return false0; |
| 302 | len = 3; |
| 303 | len += ((buf[0] & 0xf0) >> 4) / 2; |
| 304 | if (len > buflen) |
| 305 | return false0; |
| 306 | crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); |
| 307 | |
| 308 | if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { |
| 309 | DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1])__drm_dbg(DRM_UT_KMS, "crc4 mismatch 0x%x 0x%x\n", crc4, buf[ len - 1]); |
| 310 | return false0; |
| 311 | } |
| 312 | |
| 313 | hdr->lct = (buf[0] & 0xf0) >> 4; |
| 314 | hdr->lcr = (buf[0] & 0xf); |
| 315 | idx = 1; |
| 316 | for (i = 0; i < (hdr->lct / 2); i++) |
| 317 | hdr->rad[i] = buf[idx++]; |
| 318 | hdr->broadcast = (buf[idx] >> 7) & 0x1; |
| 319 | hdr->path_msg = (buf[idx] >> 6) & 0x1; |
| 320 | hdr->msg_len = buf[idx] & 0x3f; |
| 321 | idx++; |
| 322 | hdr->somt = (buf[idx] >> 7) & 0x1; |
| 323 | hdr->eomt = (buf[idx] >> 6) & 0x1; |
| 324 | hdr->seqno = (buf[idx] >> 4) & 0x1; |
| 325 | idx++; |
| 326 | *hdrlen = idx; |
| 327 | return true1; |
| 328 | } |
| 329 | |
| 330 | void |
| 331 | drm_dp_encode_sideband_req(const struct drm_dp_sideband_msg_req_body *req, |
| 332 | struct drm_dp_sideband_msg_tx *raw) |
| 333 | { |
| 334 | int idx = 0; |
| 335 | int i; |
| 336 | u8 *buf = raw->msg; |
| 337 | |
| 338 | buf[idx++] = req->req_type & 0x7f; |
| 339 | |
| 340 | switch (req->req_type) { |
| 341 | case DP_ENUM_PATH_RESOURCES0x10: |
| 342 | case DP_POWER_DOWN_PHY0x25: |
| 343 | case DP_POWER_UP_PHY0x24: |
| 344 | buf[idx] = (req->u.port_num.port_number & 0xf) << 4; |
| 345 | idx++; |
| 346 | break; |
| 347 | case DP_ALLOCATE_PAYLOAD0x11: |
| 348 | buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | |
| 349 | (req->u.allocate_payload.number_sdp_streams & 0xf); |
| 350 | idx++; |
| 351 | buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); |
| 352 | idx++; |
| 353 | buf[idx] = (req->u.allocate_payload.pbn >> 8); |
| 354 | idx++; |
| 355 | buf[idx] = (req->u.allocate_payload.pbn & 0xff); |
| 356 | idx++; |
| 357 | for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { |
| 358 | buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | |
| 359 | (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); |
| 360 | idx++; |
| 361 | } |
| 362 | if (req->u.allocate_payload.number_sdp_streams & 1) { |
| 363 | i = req->u.allocate_payload.number_sdp_streams - 1; |
| 364 | buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; |
| 365 | idx++; |
| 366 | } |
| 367 | break; |
| 368 | case DP_QUERY_PAYLOAD0x12: |
| 369 | buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; |
| 370 | idx++; |
| 371 | buf[idx] = (req->u.query_payload.vcpi & 0x7f); |
| 372 | idx++; |
| 373 | break; |
| 374 | case DP_REMOTE_DPCD_READ0x20: |
| 375 | buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; |
| 376 | buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; |
| 377 | idx++; |
| 378 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; |
| 379 | idx++; |
| 380 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); |
| 381 | idx++; |
| 382 | buf[idx] = (req->u.dpcd_read.num_bytes); |
| 383 | idx++; |
| 384 | break; |
| 385 | |
| 386 | case DP_REMOTE_DPCD_WRITE0x21: |
| 387 | buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; |
| 388 | buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; |
| 389 | idx++; |
| 390 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; |
| 391 | idx++; |
| 392 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); |
| 393 | idx++; |
| 394 | buf[idx] = (req->u.dpcd_write.num_bytes); |
| 395 | idx++; |
| 396 | memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes)__builtin_memcpy((&buf[idx]), (req->u.dpcd_write.bytes ), (req->u.dpcd_write.num_bytes)); |
| 397 | idx += req->u.dpcd_write.num_bytes; |
| 398 | break; |
| 399 | case DP_REMOTE_I2C_READ0x22: |
| 400 | buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; |
| 401 | buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); |
| 402 | idx++; |
| 403 | for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { |
| 404 | buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; |
| 405 | idx++; |
| 406 | buf[idx] = req->u.i2c_read.transactions[i].num_bytes; |
| 407 | idx++; |
| 408 | memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes)__builtin_memcpy((&buf[idx]), (req->u.i2c_read.transactions [i].bytes), (req->u.i2c_read.transactions[i].num_bytes)); |
| 409 | idx += req->u.i2c_read.transactions[i].num_bytes; |
| 410 | |
| 411 | buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 4; |
| 412 | buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); |
| 413 | idx++; |
| 414 | } |
| 415 | buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; |
| 416 | idx++; |
| 417 | buf[idx] = (req->u.i2c_read.num_bytes_read); |
| 418 | idx++; |
| 419 | break; |
| 420 | |
| 421 | case DP_REMOTE_I2C_WRITE0x23: |
| 422 | buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; |
| 423 | idx++; |
| 424 | buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; |
| 425 | idx++; |
| 426 | buf[idx] = (req->u.i2c_write.num_bytes); |
| 427 | idx++; |
| 428 | memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes)__builtin_memcpy((&buf[idx]), (req->u.i2c_write.bytes) , (req->u.i2c_write.num_bytes)); |
| 429 | idx += req->u.i2c_write.num_bytes; |
| 430 | break; |
| 431 | case DP_QUERY_STREAM_ENC_STATUS0x38: { |
| 432 | const struct drm_dp_query_stream_enc_status *msg; |
| 433 | |
| 434 | msg = &req->u.enc_status; |
| 435 | buf[idx] = msg->stream_id; |
| 436 | idx++; |
| 437 | memcpy(&buf[idx], msg->client_id, sizeof(msg->client_id))__builtin_memcpy((&buf[idx]), (msg->client_id), (sizeof (msg->client_id))); |
| 438 | idx += sizeof(msg->client_id); |
| 439 | buf[idx] = 0; |
| 440 | buf[idx] |= FIELD_PREP(GENMASK(1, 0), msg->stream_event)(((typeof((((~0UL) >> (64 - (1) - 1)) & ((~0UL) << (0)))))(msg->stream_event) << (__builtin_ffsll((((~ 0UL) >> (64 - (1) - 1)) & ((~0UL) << (0)))) - 1)) & ((((~0UL) >> (64 - (1) - 1)) & ((~0UL) << (0))))); |
| 441 | buf[idx] |= msg->valid_stream_event ? BIT(2)(1UL << (2)) : 0; |
| 442 | buf[idx] |= FIELD_PREP(GENMASK(4, 3), msg->stream_behavior)(((typeof((((~0UL) >> (64 - (4) - 1)) & ((~0UL) << (3)))))(msg->stream_behavior) << (__builtin_ffsll(( ((~0UL) >> (64 - (4) - 1)) & ((~0UL) << (3))) ) - 1)) & ((((~0UL) >> (64 - (4) - 1)) & ((~0UL ) << (3))))); |
| 443 | buf[idx] |= msg->valid_stream_behavior ? BIT(5)(1UL << (5)) : 0; |
| 444 | idx++; |
| 445 | } |
| 446 | break; |
| 447 | } |
| 448 | raw->cur_len = idx; |
| 449 | } |
| 450 | EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_encode_sideband_req); |
| 451 | |
| 452 | /* Decode a sideband request we've encoded, mainly used for debugging */ |
| 453 | int |
| 454 | drm_dp_decode_sideband_req(const struct drm_dp_sideband_msg_tx *raw, |
| 455 | struct drm_dp_sideband_msg_req_body *req) |
| 456 | { |
| 457 | const u8 *buf = raw->msg; |
| 458 | int i, idx = 0; |
| 459 | |
| 460 | req->req_type = buf[idx++] & 0x7f; |
| 461 | switch (req->req_type) { |
| 462 | case DP_ENUM_PATH_RESOURCES0x10: |
| 463 | case DP_POWER_DOWN_PHY0x25: |
| 464 | case DP_POWER_UP_PHY0x24: |
| 465 | req->u.port_num.port_number = (buf[idx] >> 4) & 0xf; |
| 466 | break; |
| 467 | case DP_ALLOCATE_PAYLOAD0x11: |
| 468 | { |
| 469 | struct drm_dp_allocate_payload *a = |
| 470 | &req->u.allocate_payload; |
| 471 | |
| 472 | a->number_sdp_streams = buf[idx] & 0xf; |
| 473 | a->port_number = (buf[idx] >> 4) & 0xf; |
| 474 | |
| 475 | WARN_ON(buf[++idx] & 0x80)({ int __ret = !!(buf[++idx] & 0x80); if (__ret) printf("WARNING %s failed at %s:%d\n" , "buf[++idx] & 0x80", "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c" , 475); __builtin_expect(!!(__ret), 0); }); |
| 476 | a->vcpi = buf[idx] & 0x7f; |
| 477 | |
| 478 | a->pbn = buf[++idx] << 8; |
| 479 | a->pbn |= buf[++idx]; |
| 480 | |
| 481 | idx++; |
| 482 | for (i = 0; i < a->number_sdp_streams; i++) { |
| 483 | a->sdp_stream_sink[i] = |
| 484 | (buf[idx + (i / 2)] >> ((i % 2) ? 0 : 4)) & 0xf; |
| 485 | } |
| 486 | } |
| 487 | break; |
| 488 | case DP_QUERY_PAYLOAD0x12: |
| 489 | req->u.query_payload.port_number = (buf[idx] >> 4) & 0xf; |
| 490 | WARN_ON(buf[++idx] & 0x80)({ int __ret = !!(buf[++idx] & 0x80); if (__ret) printf("WARNING %s failed at %s:%d\n" , "buf[++idx] & 0x80", "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c" , 490); __builtin_expect(!!(__ret), 0); }); |
| 491 | req->u.query_payload.vcpi = buf[idx] & 0x7f; |
| 492 | break; |
| 493 | case DP_REMOTE_DPCD_READ0x20: |
| 494 | { |
| 495 | struct drm_dp_remote_dpcd_read *r = &req->u.dpcd_read; |
| 496 | |
| 497 | r->port_number = (buf[idx] >> 4) & 0xf; |
| 498 | |
| 499 | r->dpcd_address = (buf[idx] << 16) & 0xf0000; |
| 500 | r->dpcd_address |= (buf[++idx] << 8) & 0xff00; |
| 501 | r->dpcd_address |= buf[++idx] & 0xff; |
| 502 | |
| 503 | r->num_bytes = buf[++idx]; |
| 504 | } |
| 505 | break; |
| 506 | case DP_REMOTE_DPCD_WRITE0x21: |
| 507 | { |
| 508 | struct drm_dp_remote_dpcd_write *w = |
| 509 | &req->u.dpcd_write; |
| 510 | |
| 511 | w->port_number = (buf[idx] >> 4) & 0xf; |
| 512 | |
| 513 | w->dpcd_address = (buf[idx] << 16) & 0xf0000; |
| 514 | w->dpcd_address |= (buf[++idx] << 8) & 0xff00; |
| 515 | w->dpcd_address |= buf[++idx] & 0xff; |
| 516 | |
| 517 | w->num_bytes = buf[++idx]; |
| 518 | |
| 519 | w->bytes = kmemdup(&buf[++idx], w->num_bytes, |
| 520 | GFP_KERNEL(0x0001 | 0x0004)); |
| 521 | if (!w->bytes) |
| 522 | return -ENOMEM12; |
| 523 | } |
| 524 | break; |
| 525 | case DP_REMOTE_I2C_READ0x22: |
| 526 | { |
| 527 | struct drm_dp_remote_i2c_read *r = &req->u.i2c_read; |
| 528 | struct drm_dp_remote_i2c_read_tx *tx; |
| 529 | bool_Bool failed = false0; |
| 530 | |
| 531 | r->num_transactions = buf[idx] & 0x3; |
| 532 | r->port_number = (buf[idx] >> 4) & 0xf; |
| 533 | for (i = 0; i < r->num_transactions; i++) { |
| 534 | tx = &r->transactions[i]; |
| 535 | |
| 536 | tx->i2c_dev_id = buf[++idx] & 0x7f; |
| 537 | tx->num_bytes = buf[++idx]; |
| 538 | tx->bytes = kmemdup(&buf[++idx], |
| 539 | tx->num_bytes, |
| 540 | GFP_KERNEL(0x0001 | 0x0004)); |
| 541 | if (!tx->bytes) { |
| 542 | failed = true1; |
| 543 | break; |
| 544 | } |
| 545 | idx += tx->num_bytes; |
| 546 | tx->no_stop_bit = (buf[idx] >> 5) & 0x1; |
| 547 | tx->i2c_transaction_delay = buf[idx] & 0xf; |
| 548 | } |
| 549 | |
| 550 | if (failed) { |
| 551 | for (i = 0; i < r->num_transactions; i++) { |
| 552 | tx = &r->transactions[i]; |
| 553 | kfree(tx->bytes); |
| 554 | } |
| 555 | return -ENOMEM12; |
| 556 | } |
| 557 | |
| 558 | r->read_i2c_device_id = buf[++idx] & 0x7f; |
| 559 | r->num_bytes_read = buf[++idx]; |
| 560 | } |
| 561 | break; |
| 562 | case DP_REMOTE_I2C_WRITE0x23: |
| 563 | { |
| 564 | struct drm_dp_remote_i2c_write *w = &req->u.i2c_write; |
| 565 | |
| 566 | w->port_number = (buf[idx] >> 4) & 0xf; |
| 567 | w->write_i2c_device_id = buf[++idx] & 0x7f; |
| 568 | w->num_bytes = buf[++idx]; |
| 569 | w->bytes = kmemdup(&buf[++idx], w->num_bytes, |
| 570 | GFP_KERNEL(0x0001 | 0x0004)); |
| 571 | if (!w->bytes) |
| 572 | return -ENOMEM12; |
| 573 | } |
| 574 | break; |
| 575 | case DP_QUERY_STREAM_ENC_STATUS0x38: |
| 576 | req->u.enc_status.stream_id = buf[idx++]; |
| 577 | for (i = 0; i < sizeof(req->u.enc_status.client_id); i++) |
| 578 | req->u.enc_status.client_id[i] = buf[idx++]; |
| 579 | |
| 580 | req->u.enc_status.stream_event = FIELD_GET(GENMASK(1, 0),((typeof((((~0UL) >> (64 - (1) - 1)) & ((~0UL) << (0)))))(((buf[idx]) & ((((~0UL) >> (64 - (1) - 1)) & ((~0UL) << (0))))) >> (__builtin_ffsll(((( ~0UL) >> (64 - (1) - 1)) & ((~0UL) << (0)))) - 1))) |
| 581 | buf[idx])((typeof((((~0UL) >> (64 - (1) - 1)) & ((~0UL) << (0)))))(((buf[idx]) & ((((~0UL) >> (64 - (1) - 1)) & ((~0UL) << (0))))) >> (__builtin_ffsll(((( ~0UL) >> (64 - (1) - 1)) & ((~0UL) << (0)))) - 1))); |
| 582 | req->u.enc_status.valid_stream_event = FIELD_GET(BIT(2),((typeof((1UL << (2))))(((buf[idx]) & ((1UL << (2)))) >> (__builtin_ffsll((1UL << (2))) - 1))) |
| 583 | buf[idx])((typeof((1UL << (2))))(((buf[idx]) & ((1UL << (2)))) >> (__builtin_ffsll((1UL << (2))) - 1))); |
| 584 | req->u.enc_status.stream_behavior = FIELD_GET(GENMASK(4, 3),((typeof((((~0UL) >> (64 - (4) - 1)) & ((~0UL) << (3)))))(((buf[idx]) & ((((~0UL) >> (64 - (4) - 1)) & ((~0UL) << (3))))) >> (__builtin_ffsll(((( ~0UL) >> (64 - (4) - 1)) & ((~0UL) << (3)))) - 1))) |
| 585 | buf[idx])((typeof((((~0UL) >> (64 - (4) - 1)) & ((~0UL) << (3)))))(((buf[idx]) & ((((~0UL) >> (64 - (4) - 1)) & ((~0UL) << (3))))) >> (__builtin_ffsll(((( ~0UL) >> (64 - (4) - 1)) & ((~0UL) << (3)))) - 1))); |
| 586 | req->u.enc_status.valid_stream_behavior = FIELD_GET(BIT(5),((typeof((1UL << (5))))(((buf[idx]) & ((1UL << (5)))) >> (__builtin_ffsll((1UL << (5))) - 1))) |
| 587 | buf[idx])((typeof((1UL << (5))))(((buf[idx]) & ((1UL << (5)))) >> (__builtin_ffsll((1UL << (5))) - 1))); |
| 588 | break; |
| 589 | } |
| 590 | |
| 591 | return 0; |
| 592 | } |
| 593 | EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_decode_sideband_req); |
| 594 | |
| 595 | void |
| 596 | drm_dp_dump_sideband_msg_req_body(const struct drm_dp_sideband_msg_req_body *req, |
| 597 | int indent, struct drm_printer *printer) |
| 598 | { |
| 599 | int i; |
| 600 | |
| 601 | #define P(f, ...) drm_printf_indent(printer, indent, f, ##__VA_ARGS__)drm_printf((printer), "%.*s" f, (indent), "\t\t\t\t\tX", ##__VA_ARGS__ ) |
| 602 | if (req->req_type == DP_LINK_ADDRESS0x01) { |
| 603 | /* No contents to print */ |
| 604 | P("type=%s\n", drm_dp_mst_req_type_str(req->req_type)); |
| 605 | return; |
| 606 | } |
| 607 | |
| 608 | P("type=%s contents:\n", drm_dp_mst_req_type_str(req->req_type)); |
| 609 | indent++; |
| 610 | |
| 611 | switch (req->req_type) { |
| 612 | case DP_ENUM_PATH_RESOURCES0x10: |
| 613 | case DP_POWER_DOWN_PHY0x25: |
| 614 | case DP_POWER_UP_PHY0x24: |
| 615 | P("port=%d\n", req->u.port_num.port_number); |
| 616 | break; |
| 617 | case DP_ALLOCATE_PAYLOAD0x11: |
| 618 | P("port=%d vcpi=%d pbn=%d sdp_streams=%d %*ph\n", |
| 619 | req->u.allocate_payload.port_number, |
| 620 | req->u.allocate_payload.vcpi, req->u.allocate_payload.pbn, |
| 621 | req->u.allocate_payload.number_sdp_streams, |
| 622 | req->u.allocate_payload.number_sdp_streams, |
| 623 | req->u.allocate_payload.sdp_stream_sink); |
| 624 | break; |
| 625 | case DP_QUERY_PAYLOAD0x12: |
| 626 | P("port=%d vcpi=%d\n", |
| 627 | req->u.query_payload.port_number, |
| 628 | req->u.query_payload.vcpi); |
| 629 | break; |
| 630 | case DP_REMOTE_DPCD_READ0x20: |
| 631 | P("port=%d dpcd_addr=%05x len=%d\n", |
| 632 | req->u.dpcd_read.port_number, req->u.dpcd_read.dpcd_address, |
| 633 | req->u.dpcd_read.num_bytes); |
| 634 | break; |
| 635 | case DP_REMOTE_DPCD_WRITE0x21: |
| 636 | P("port=%d addr=%05x len=%d: %*ph\n", |
| 637 | req->u.dpcd_write.port_number, |
| 638 | req->u.dpcd_write.dpcd_address, |
| 639 | req->u.dpcd_write.num_bytes, req->u.dpcd_write.num_bytes, |
| 640 | req->u.dpcd_write.bytes); |
| 641 | break; |
| 642 | case DP_REMOTE_I2C_READ0x22: |
| 643 | P("port=%d num_tx=%d id=%d size=%d:\n", |
| 644 | req->u.i2c_read.port_number, |
| 645 | req->u.i2c_read.num_transactions, |
| 646 | req->u.i2c_read.read_i2c_device_id, |
| 647 | req->u.i2c_read.num_bytes_read); |
| 648 | |
| 649 | indent++; |
| 650 | for (i = 0; i < req->u.i2c_read.num_transactions; i++) { |
| 651 | const struct drm_dp_remote_i2c_read_tx *rtx = |
| 652 | &req->u.i2c_read.transactions[i]; |
| 653 | |
| 654 | P("%d: id=%03d size=%03d no_stop_bit=%d tx_delay=%03d: %*ph\n", |
| 655 | i, rtx->i2c_dev_id, rtx->num_bytes, |
| 656 | rtx->no_stop_bit, rtx->i2c_transaction_delay, |
| 657 | rtx->num_bytes, rtx->bytes); |
| 658 | } |
| 659 | break; |
| 660 | case DP_REMOTE_I2C_WRITE0x23: |
| 661 | P("port=%d id=%d size=%d: %*ph\n", |
| 662 | req->u.i2c_write.port_number, |
| 663 | req->u.i2c_write.write_i2c_device_id, |
| 664 | req->u.i2c_write.num_bytes, req->u.i2c_write.num_bytes, |
| 665 | req->u.i2c_write.bytes); |
| 666 | break; |
| 667 | case DP_QUERY_STREAM_ENC_STATUS0x38: |
| 668 | P("stream_id=%u client_id=%*ph stream_event=%x " |
| 669 | "valid_event=%d stream_behavior=%x valid_behavior=%d", |
| 670 | req->u.enc_status.stream_id, |
| 671 | (int)ARRAY_SIZE(req->u.enc_status.client_id)(sizeof((req->u.enc_status.client_id)) / sizeof((req->u .enc_status.client_id)[0])), |
| 672 | req->u.enc_status.client_id, req->u.enc_status.stream_event, |
| 673 | req->u.enc_status.valid_stream_event, |
| 674 | req->u.enc_status.stream_behavior, |
| 675 | req->u.enc_status.valid_stream_behavior); |
| 676 | break; |
| 677 | default: |
| 678 | P("???\n"); |
| 679 | break; |
| 680 | } |
| 681 | #undef P |
| 682 | } |
| 683 | EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_dump_sideband_msg_req_body); |
| 684 | |
| 685 | static inline void |
| 686 | drm_dp_mst_dump_sideband_msg_tx(struct drm_printer *p, |
| 687 | const struct drm_dp_sideband_msg_tx *txmsg) |
| 688 | { |
| 689 | struct drm_dp_sideband_msg_req_body req; |
| 690 | char buf[64]; |
| 691 | int ret; |
| 692 | int i; |
| 693 | |
| 694 | drm_dp_mst_rad_to_str(txmsg->dst->rad, txmsg->dst->lct, buf, |
| 695 | sizeof(buf)); |
| 696 | drm_printf(p, "txmsg cur_offset=%x cur_len=%x seqno=%x state=%s path_msg=%d dst=%s\n", |
| 697 | txmsg->cur_offset, txmsg->cur_len, txmsg->seqno, |
| 698 | drm_dp_mst_sideband_tx_state_str(txmsg->state), |
| 699 | txmsg->path_msg, buf); |
| 700 | |
| 701 | ret = drm_dp_decode_sideband_req(txmsg, &req); |
| 702 | if (ret) { |
| 703 | drm_printf(p, "<failed to decode sideband req: %d>\n", ret); |
| 704 | return; |
| 705 | } |
| 706 | drm_dp_dump_sideband_msg_req_body(&req, 1, p); |
| 707 | |
| 708 | switch (req.req_type) { |
| 709 | case DP_REMOTE_DPCD_WRITE0x21: |
| 710 | kfree(req.u.dpcd_write.bytes); |
| 711 | break; |
| 712 | case DP_REMOTE_I2C_READ0x22: |
| 713 | for (i = 0; i < req.u.i2c_read.num_transactions; i++) |
| 714 | kfree(req.u.i2c_read.transactions[i].bytes); |
| 715 | break; |
| 716 | case DP_REMOTE_I2C_WRITE0x23: |
| 717 | kfree(req.u.i2c_write.bytes); |
| 718 | break; |
| 719 | } |
| 720 | } |
| 721 | |
| 722 | static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) |
| 723 | { |
| 724 | u8 crc4; |
| 725 | |
| 726 | crc4 = drm_dp_msg_data_crc4(msg, len); |
| 727 | msg[len] = crc4; |
| 728 | } |
| 729 | |
| 730 | static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, |
| 731 | struct drm_dp_sideband_msg_tx *raw) |
| 732 | { |
| 733 | int idx = 0; |
| 734 | u8 *buf = raw->msg; |
| 735 | |
| 736 | buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); |
| 737 | |
| 738 | raw->cur_len = idx; |
| 739 | } |
| 740 | |
| 741 | static int drm_dp_sideband_msg_set_header(struct drm_dp_sideband_msg_rx *msg, |
| 742 | struct drm_dp_sideband_msg_hdr *hdr, |
| 743 | u8 hdrlen) |
| 744 | { |
| 745 | /* |
| 746 | * ignore out-of-order messages or messages that are part of a |
| 747 | * failed transaction |
| 748 | */ |
| 749 | if (!hdr->somt && !msg->have_somt) |
| 750 | return false0; |
| 751 | |
| 752 | /* get length contained in this portion */ |
| 753 | msg->curchunk_idx = 0; |
| 754 | msg->curchunk_len = hdr->msg_len; |
| 755 | msg->curchunk_hdrlen = hdrlen; |
| 756 | |
| 757 | /* we have already gotten an somt - don't bother parsing */ |
| 758 | if (hdr->somt && msg->have_somt) |
| 759 | return false0; |
| 760 | |
| 761 | if (hdr->somt) { |
| 762 | memcpy(&msg->initial_hdr, hdr,__builtin_memcpy((&msg->initial_hdr), (hdr), (sizeof(struct drm_dp_sideband_msg_hdr))) |
| 763 | sizeof(struct drm_dp_sideband_msg_hdr))__builtin_memcpy((&msg->initial_hdr), (hdr), (sizeof(struct drm_dp_sideband_msg_hdr))); |
| 764 | msg->have_somt = true1; |
| 765 | } |
| 766 | if (hdr->eomt) |
| 767 | msg->have_eomt = true1; |
| 768 | |
| 769 | return true1; |
| 770 | } |
| 771 | |
| 772 | /* this adds a chunk of msg to the builder to get the final msg */ |
| 773 | static bool_Bool drm_dp_sideband_append_payload(struct drm_dp_sideband_msg_rx *msg, |
| 774 | u8 *replybuf, u8 replybuflen) |
| 775 | { |
| 776 | u8 crc4; |
| 777 | |
| 778 | memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen)__builtin_memcpy((&msg->chunk[msg->curchunk_idx]), ( replybuf), (replybuflen)); |
| 779 | msg->curchunk_idx += replybuflen; |
| 780 | |
| 781 | if (msg->curchunk_idx >= msg->curchunk_len) { |
| 782 | /* do CRC */ |
| 783 | crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); |
| 784 | if (crc4 != msg->chunk[msg->curchunk_len - 1]) |
| 785 | print_hex_dump(KERN_DEBUG"\0017", "wrong crc", |
| 786 | DUMP_PREFIX_NONE, 16, 1, |
| 787 | msg->chunk, msg->curchunk_len, false0); |
| 788 | /* copy chunk into bigger msg */ |
| 789 | memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1)__builtin_memcpy((&msg->msg[msg->curlen]), (msg-> chunk), (msg->curchunk_len - 1)); |
| 790 | msg->curlen += msg->curchunk_len - 1; |
| 791 | } |
| 792 | return true1; |
| 793 | } |
| 794 | |
| 795 | static bool_Bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, |
| 796 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 797 | { |
| 798 | int idx = 1; |
| 799 | int i; |
| 800 | |
| 801 | memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16)__builtin_memcpy((repmsg->u.link_addr.guid), (&raw-> msg[idx]), (16)); |
| 802 | idx += 16; |
| 803 | repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; |
| 804 | idx++; |
| 805 | if (idx > raw->curlen) |
| 806 | goto fail_len; |
| 807 | for (i = 0; i < repmsg->u.link_addr.nports; i++) { |
| 808 | if (raw->msg[idx] & 0x80) |
| 809 | repmsg->u.link_addr.ports[i].input_port = 1; |
| 810 | |
| 811 | repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; |
| 812 | repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); |
| 813 | |
| 814 | idx++; |
| 815 | if (idx > raw->curlen) |
| 816 | goto fail_len; |
| 817 | repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; |
| 818 | repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; |
| 819 | if (repmsg->u.link_addr.ports[i].input_port == 0) |
| 820 | repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; |
| 821 | idx++; |
| 822 | if (idx > raw->curlen) |
| 823 | goto fail_len; |
| 824 | if (repmsg->u.link_addr.ports[i].input_port == 0) { |
| 825 | repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); |
| 826 | idx++; |
| 827 | if (idx > raw->curlen) |
| 828 | goto fail_len; |
| 829 | memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16)__builtin_memcpy((repmsg->u.link_addr.ports[i].peer_guid), (&raw->msg[idx]), (16)); |
| 830 | idx += 16; |
| 831 | if (idx > raw->curlen) |
| 832 | goto fail_len; |
| 833 | repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; |
| 834 | repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); |
| 835 | idx++; |
| 836 | |
| 837 | } |
| 838 | if (idx > raw->curlen) |
| 839 | goto fail_len; |
| 840 | } |
| 841 | |
| 842 | return true1; |
| 843 | fail_len: |
| 844 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen)__drm_dbg(DRM_UT_KMS, "link address reply parse length fail %d %d\n" , idx, raw->curlen); |
| 845 | return false0; |
| 846 | } |
| 847 | |
| 848 | static bool_Bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, |
| 849 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 850 | { |
| 851 | int idx = 1; |
| 852 | |
| 853 | repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; |
| 854 | idx++; |
| 855 | if (idx > raw->curlen) |
| 856 | goto fail_len; |
| 857 | repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; |
| 858 | idx++; |
| 859 | if (idx > raw->curlen) |
| 860 | goto fail_len; |
| 861 | |
| 862 | memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes)__builtin_memcpy((repmsg->u.remote_dpcd_read_ack.bytes), ( &raw->msg[idx]), (repmsg->u.remote_dpcd_read_ack.num_bytes )); |
| 863 | return true1; |
| 864 | fail_len: |
| 865 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen)__drm_dbg(DRM_UT_KMS, "link address reply parse length fail %d %d\n" , idx, raw->curlen); |
| 866 | return false0; |
| 867 | } |
| 868 | |
| 869 | static bool_Bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, |
| 870 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 871 | { |
| 872 | int idx = 1; |
| 873 | |
| 874 | repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; |
| 875 | idx++; |
| 876 | if (idx > raw->curlen) |
| 877 | goto fail_len; |
| 878 | return true1; |
| 879 | fail_len: |
| 880 | DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen)__drm_dbg(DRM_UT_KMS, "parse length fail %d %d\n", idx, raw-> curlen); |
| 881 | return false0; |
| 882 | } |
| 883 | |
| 884 | static bool_Bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, |
| 885 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 886 | { |
| 887 | int idx = 1; |
| 888 | |
| 889 | repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); |
| 890 | idx++; |
| 891 | if (idx > raw->curlen) |
| 892 | goto fail_len; |
| 893 | repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; |
| 894 | idx++; |
| 895 | /* TODO check */ |
| 896 | memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes)__builtin_memcpy((repmsg->u.remote_i2c_read_ack.bytes), (& raw->msg[idx]), (repmsg->u.remote_i2c_read_ack.num_bytes )); |
| 897 | return true1; |
| 898 | fail_len: |
| 899 | DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen)__drm_dbg(DRM_UT_KMS, "remote i2c reply parse length fail %d %d\n" , idx, raw->curlen); |
| 900 | return false0; |
| 901 | } |
| 902 | |
| 903 | static bool_Bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, |
| 904 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 905 | { |
| 906 | int idx = 1; |
| 907 | |
| 908 | repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; |
| 909 | repmsg->u.path_resources.fec_capable = raw->msg[idx] & 0x1; |
| 910 | idx++; |
| 911 | if (idx > raw->curlen) |
| 912 | goto fail_len; |
| 913 | repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
| 914 | idx += 2; |
| 915 | if (idx > raw->curlen) |
| 916 | goto fail_len; |
| 917 | repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
| 918 | idx += 2; |
| 919 | if (idx > raw->curlen) |
| 920 | goto fail_len; |
| 921 | return true1; |
| 922 | fail_len: |
| 923 | DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen)__drm_dbg(DRM_UT_KMS, "enum resource parse length fail %d %d\n" , idx, raw->curlen); |
| 924 | return false0; |
| 925 | } |
| 926 | |
| 927 | static bool_Bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, |
| 928 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 929 | { |
| 930 | int idx = 1; |
| 931 | |
| 932 | repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; |
| 933 | idx++; |
| 934 | if (idx > raw->curlen) |
| 935 | goto fail_len; |
| 936 | repmsg->u.allocate_payload.vcpi = raw->msg[idx]; |
| 937 | idx++; |
| 938 | if (idx > raw->curlen) |
| 939 | goto fail_len; |
| 940 | repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
| 941 | idx += 2; |
| 942 | if (idx > raw->curlen) |
| 943 | goto fail_len; |
| 944 | return true1; |
| 945 | fail_len: |
| 946 | DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen)__drm_dbg(DRM_UT_KMS, "allocate payload parse length fail %d %d\n" , idx, raw->curlen); |
| 947 | return false0; |
| 948 | } |
| 949 | |
| 950 | static bool_Bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, |
| 951 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 952 | { |
| 953 | int idx = 1; |
| 954 | |
| 955 | repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; |
| 956 | idx++; |
| 957 | if (idx > raw->curlen) |
| 958 | goto fail_len; |
| 959 | repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); |
| 960 | idx += 2; |
| 961 | if (idx > raw->curlen) |
| 962 | goto fail_len; |
| 963 | return true1; |
| 964 | fail_len: |
| 965 | DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen)__drm_dbg(DRM_UT_KMS, "query payload parse length fail %d %d\n" , idx, raw->curlen); |
| 966 | return false0; |
| 967 | } |
| 968 | |
| 969 | static bool_Bool drm_dp_sideband_parse_power_updown_phy_ack(struct drm_dp_sideband_msg_rx *raw, |
| 970 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 971 | { |
| 972 | int idx = 1; |
| 973 | |
| 974 | repmsg->u.port_number.port_number = (raw->msg[idx] >> 4) & 0xf; |
| 975 | idx++; |
| 976 | if (idx > raw->curlen) { |
| 977 | DRM_DEBUG_KMS("power up/down phy parse length fail %d %d\n",__drm_dbg(DRM_UT_KMS, "power up/down phy parse length fail %d %d\n" , idx, raw->curlen) |
| 978 | idx, raw->curlen)__drm_dbg(DRM_UT_KMS, "power up/down phy parse length fail %d %d\n" , idx, raw->curlen); |
| 979 | return false0; |
| 980 | } |
| 981 | return true1; |
| 982 | } |
| 983 | |
| 984 | static bool_Bool |
| 985 | drm_dp_sideband_parse_query_stream_enc_status( |
| 986 | struct drm_dp_sideband_msg_rx *raw, |
| 987 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 988 | { |
| 989 | struct drm_dp_query_stream_enc_status_ack_reply *reply; |
| 990 | |
| 991 | reply = &repmsg->u.enc_status; |
| 992 | |
| 993 | reply->stream_id = raw->msg[3]; |
| 994 | |
| 995 | reply->reply_signed = raw->msg[2] & BIT(0)(1UL << (0)); |
| 996 | |
| 997 | /* |
| 998 | * NOTE: It's my impression from reading the spec that the below parsing |
| 999 | * is correct. However I noticed while testing with an HDCP 1.4 display |
| 1000 | * through an HDCP 2.2 hub that only bit 3 was set. In that case, I |
| 1001 | * would expect both bits to be set. So keep the parsing following the |
| 1002 | * spec, but beware reality might not match the spec (at least for some |
| 1003 | * configurations). |
| 1004 | */ |
| 1005 | reply->hdcp_1x_device_present = raw->msg[2] & BIT(4)(1UL << (4)); |
| 1006 | reply->hdcp_2x_device_present = raw->msg[2] & BIT(3)(1UL << (3)); |
| 1007 | |
| 1008 | reply->query_capable_device_present = raw->msg[2] & BIT(5)(1UL << (5)); |
| 1009 | reply->legacy_device_present = raw->msg[2] & BIT(6)(1UL << (6)); |
| 1010 | reply->unauthorizable_device_present = raw->msg[2] & BIT(7)(1UL << (7)); |
| 1011 | |
| 1012 | reply->auth_completed = !!(raw->msg[1] & BIT(3)(1UL << (3))); |
| 1013 | reply->encryption_enabled = !!(raw->msg[1] & BIT(4)(1UL << (4))); |
| 1014 | reply->repeater_present = !!(raw->msg[1] & BIT(5)(1UL << (5))); |
| 1015 | reply->state = (raw->msg[1] & GENMASK(7, 6)(((~0UL) >> (64 - (7) - 1)) & ((~0UL) << (6)) )) >> 6; |
| 1016 | |
| 1017 | return true1; |
| 1018 | } |
| 1019 | |
| 1020 | static bool_Bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, |
| 1021 | struct drm_dp_sideband_msg_reply_body *msg) |
| 1022 | { |
| 1023 | memset(msg, 0, sizeof(*msg))__builtin_memset((msg), (0), (sizeof(*msg))); |
| 1024 | msg->reply_type = (raw->msg[0] & 0x80) >> 7; |
| 1025 | msg->req_type = (raw->msg[0] & 0x7f); |
| 1026 | |
| 1027 | if (msg->reply_type == DP_SIDEBAND_REPLY_NAK0x01) { |
| 1028 | memcpy(msg->u.nak.guid, &raw->msg[1], 16)__builtin_memcpy((msg->u.nak.guid), (&raw->msg[1]), (16)); |
| 1029 | msg->u.nak.reason = raw->msg[17]; |
| 1030 | msg->u.nak.nak_data = raw->msg[18]; |
| 1031 | return false0; |
| 1032 | } |
| 1033 | |
| 1034 | switch (msg->req_type) { |
| 1035 | case DP_LINK_ADDRESS0x01: |
| 1036 | return drm_dp_sideband_parse_link_address(raw, msg); |
| 1037 | case DP_QUERY_PAYLOAD0x12: |
| 1038 | return drm_dp_sideband_parse_query_payload_ack(raw, msg); |
| 1039 | case DP_REMOTE_DPCD_READ0x20: |
| 1040 | return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); |
| 1041 | case DP_REMOTE_DPCD_WRITE0x21: |
| 1042 | return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); |
| 1043 | case DP_REMOTE_I2C_READ0x22: |
| 1044 | return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); |
| 1045 | case DP_REMOTE_I2C_WRITE0x23: |
| 1046 | return true1; /* since there's nothing to parse */ |
| 1047 | case DP_ENUM_PATH_RESOURCES0x10: |
| 1048 | return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); |
| 1049 | case DP_ALLOCATE_PAYLOAD0x11: |
| 1050 | return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); |
| 1051 | case DP_POWER_DOWN_PHY0x25: |
| 1052 | case DP_POWER_UP_PHY0x24: |
| 1053 | return drm_dp_sideband_parse_power_updown_phy_ack(raw, msg); |
| 1054 | case DP_CLEAR_PAYLOAD_ID_TABLE0x14: |
| 1055 | return true1; /* since there's nothing to parse */ |
| 1056 | case DP_QUERY_STREAM_ENC_STATUS0x38: |
| 1057 | return drm_dp_sideband_parse_query_stream_enc_status(raw, msg); |
| 1058 | default: |
| 1059 | DRM_ERROR("Got unknown reply 0x%02x (%s)\n", msg->req_type,__drm_err("Got unknown reply 0x%02x (%s)\n", msg->req_type , drm_dp_mst_req_type_str(msg->req_type)) |
| 1060 | drm_dp_mst_req_type_str(msg->req_type))__drm_err("Got unknown reply 0x%02x (%s)\n", msg->req_type , drm_dp_mst_req_type_str(msg->req_type)); |
| 1061 | return false0; |
| 1062 | } |
| 1063 | } |
| 1064 | |
| 1065 | static bool_Bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, |
| 1066 | struct drm_dp_sideband_msg_req_body *msg) |
| 1067 | { |
| 1068 | int idx = 1; |
| 1069 | |
| 1070 | msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; |
| 1071 | idx++; |
| 1072 | if (idx > raw->curlen) |
| 1073 | goto fail_len; |
| 1074 | |
| 1075 | memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16)__builtin_memcpy((msg->u.conn_stat.guid), (&raw->msg [idx]), (16)); |
| 1076 | idx += 16; |
| 1077 | if (idx > raw->curlen) |
| 1078 | goto fail_len; |
| 1079 | |
| 1080 | msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; |
| 1081 | msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; |
| 1082 | msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; |
| 1083 | msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; |
| 1084 | msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); |
| 1085 | idx++; |
| 1086 | return true1; |
| 1087 | fail_len: |
| 1088 | DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen)__drm_dbg(DRM_UT_KMS, "connection status reply parse length fail %d %d\n" , idx, raw->curlen); |
| 1089 | return false0; |
| 1090 | } |
| 1091 | |
| 1092 | static bool_Bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, |
| 1093 | struct drm_dp_sideband_msg_req_body *msg) |
| 1094 | { |
| 1095 | int idx = 1; |
| 1096 | |
| 1097 | msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; |
| 1098 | idx++; |
| 1099 | if (idx > raw->curlen) |
| 1100 | goto fail_len; |
| 1101 | |
| 1102 | memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16)__builtin_memcpy((msg->u.resource_stat.guid), (&raw-> msg[idx]), (16)); |
| 1103 | idx += 16; |
| 1104 | if (idx > raw->curlen) |
| 1105 | goto fail_len; |
| 1106 | |
| 1107 | msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); |
| 1108 | idx++; |
| 1109 | return true1; |
| 1110 | fail_len: |
| 1111 | DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen)__drm_dbg(DRM_UT_KMS, "resource status reply parse length fail %d %d\n" , idx, raw->curlen); |
| 1112 | return false0; |
| 1113 | } |
| 1114 | |
| 1115 | static bool_Bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, |
| 1116 | struct drm_dp_sideband_msg_req_body *msg) |
| 1117 | { |
| 1118 | memset(msg, 0, sizeof(*msg))__builtin_memset((msg), (0), (sizeof(*msg))); |
| 1119 | msg->req_type = (raw->msg[0] & 0x7f); |
| 1120 | |
| 1121 | switch (msg->req_type) { |
| 1122 | case DP_CONNECTION_STATUS_NOTIFY0x02: |
| 1123 | return drm_dp_sideband_parse_connection_status_notify(raw, msg); |
| 1124 | case DP_RESOURCE_STATUS_NOTIFY0x13: |
| 1125 | return drm_dp_sideband_parse_resource_status_notify(raw, msg); |
| 1126 | default: |
| 1127 | DRM_ERROR("Got unknown request 0x%02x (%s)\n", msg->req_type,__drm_err("Got unknown request 0x%02x (%s)\n", msg->req_type , drm_dp_mst_req_type_str(msg->req_type)) |
| 1128 | drm_dp_mst_req_type_str(msg->req_type))__drm_err("Got unknown request 0x%02x (%s)\n", msg->req_type , drm_dp_mst_req_type_str(msg->req_type)); |
| 1129 | return false0; |
| 1130 | } |
| 1131 | } |
| 1132 | |
| 1133 | static void build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, |
| 1134 | u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) |
| 1135 | { |
| 1136 | struct drm_dp_sideband_msg_req_body req; |
| 1137 | |
| 1138 | req.req_type = DP_REMOTE_DPCD_WRITE0x21; |
| 1139 | req.u.dpcd_write.port_number = port_num; |
| 1140 | req.u.dpcd_write.dpcd_address = offset; |
| 1141 | req.u.dpcd_write.num_bytes = num_bytes; |
| 1142 | req.u.dpcd_write.bytes = bytes; |
| 1143 | drm_dp_encode_sideband_req(&req, msg); |
| 1144 | } |
| 1145 | |
| 1146 | static void build_link_address(struct drm_dp_sideband_msg_tx *msg) |
| 1147 | { |
| 1148 | struct drm_dp_sideband_msg_req_body req; |
| 1149 | |
| 1150 | req.req_type = DP_LINK_ADDRESS0x01; |
| 1151 | drm_dp_encode_sideband_req(&req, msg); |
| 1152 | } |
| 1153 | |
| 1154 | static void build_clear_payload_id_table(struct drm_dp_sideband_msg_tx *msg) |
| 1155 | { |
| 1156 | struct drm_dp_sideband_msg_req_body req; |
| 1157 | |
| 1158 | req.req_type = DP_CLEAR_PAYLOAD_ID_TABLE0x14; |
| 1159 | drm_dp_encode_sideband_req(&req, msg); |
| 1160 | msg->path_msg = true1; |
| 1161 | } |
| 1162 | |
| 1163 | static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, |
| 1164 | int port_num) |
| 1165 | { |
| 1166 | struct drm_dp_sideband_msg_req_body req; |
| 1167 | |
| 1168 | req.req_type = DP_ENUM_PATH_RESOURCES0x10; |
| 1169 | req.u.port_num.port_number = port_num; |
| 1170 | drm_dp_encode_sideband_req(&req, msg); |
| 1171 | msg->path_msg = true1; |
| 1172 | return 0; |
| 1173 | } |
| 1174 | |
| 1175 | static void build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, |
| 1176 | int port_num, |
| 1177 | u8 vcpi, uint16_t pbn, |
| 1178 | u8 number_sdp_streams, |
| 1179 | u8 *sdp_stream_sink) |
| 1180 | { |
| 1181 | struct drm_dp_sideband_msg_req_body req; |
| 1182 | |
| 1183 | memset(&req, 0, sizeof(req))__builtin_memset((&req), (0), (sizeof(req))); |
| 1184 | req.req_type = DP_ALLOCATE_PAYLOAD0x11; |
| 1185 | req.u.allocate_payload.port_number = port_num; |
| 1186 | req.u.allocate_payload.vcpi = vcpi; |
| 1187 | req.u.allocate_payload.pbn = pbn; |
| 1188 | req.u.allocate_payload.number_sdp_streams = number_sdp_streams; |
| 1189 | memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink,__builtin_memcpy((req.u.allocate_payload.sdp_stream_sink), (sdp_stream_sink ), (number_sdp_streams)) |
| 1190 | number_sdp_streams)__builtin_memcpy((req.u.allocate_payload.sdp_stream_sink), (sdp_stream_sink ), (number_sdp_streams)); |
| 1191 | drm_dp_encode_sideband_req(&req, msg); |
| 1192 | msg->path_msg = true1; |
| 1193 | } |
| 1194 | |
| 1195 | static void build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg, |
| 1196 | int port_num, bool_Bool power_up) |
| 1197 | { |
| 1198 | struct drm_dp_sideband_msg_req_body req; |
| 1199 | |
| 1200 | if (power_up) |
| 1201 | req.req_type = DP_POWER_UP_PHY0x24; |
| 1202 | else |
| 1203 | req.req_type = DP_POWER_DOWN_PHY0x25; |
| 1204 | |
| 1205 | req.u.port_num.port_number = port_num; |
| 1206 | drm_dp_encode_sideband_req(&req, msg); |
| 1207 | msg->path_msg = true1; |
| 1208 | } |
| 1209 | |
| 1210 | static int |
| 1211 | build_query_stream_enc_status(struct drm_dp_sideband_msg_tx *msg, u8 stream_id, |
| 1212 | u8 *q_id) |
| 1213 | { |
| 1214 | struct drm_dp_sideband_msg_req_body req; |
| 1215 | |
| 1216 | req.req_type = DP_QUERY_STREAM_ENC_STATUS0x38; |
| 1217 | req.u.enc_status.stream_id = stream_id; |
| 1218 | memcpy(req.u.enc_status.client_id, q_id,__builtin_memcpy((req.u.enc_status.client_id), (q_id), (sizeof (req.u.enc_status.client_id))) |
| 1219 | sizeof(req.u.enc_status.client_id))__builtin_memcpy((req.u.enc_status.client_id), (q_id), (sizeof (req.u.enc_status.client_id))); |
| 1220 | req.u.enc_status.stream_event = 0; |
| 1221 | req.u.enc_status.valid_stream_event = false0; |
| 1222 | req.u.enc_status.stream_behavior = 0; |
| 1223 | req.u.enc_status.valid_stream_behavior = false0; |
| 1224 | |
| 1225 | drm_dp_encode_sideband_req(&req, msg); |
| 1226 | return 0; |
| 1227 | } |
| 1228 | |
| 1229 | static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, |
| 1230 | struct drm_dp_vcpi *vcpi) |
| 1231 | { |
| 1232 | int ret, vcpi_ret; |
| 1233 | |
| 1234 | mutex_lock(&mgr->payload_lock)rw_enter_write(&mgr->payload_lock); |
| 1235 | ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); |
| 1236 | if (ret > mgr->max_payloads) { |
| 1237 | ret = -EINVAL22; |
| 1238 | DRM_DEBUG_KMS("out of payload ids %d\n", ret)__drm_dbg(DRM_UT_KMS, "out of payload ids %d\n", ret); |
| 1239 | goto out_unlock; |
| 1240 | } |
| 1241 | |
| 1242 | vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); |
| 1243 | if (vcpi_ret > mgr->max_payloads) { |
| 1244 | ret = -EINVAL22; |
| 1245 | DRM_DEBUG_KMS("out of vcpi ids %d\n", ret)__drm_dbg(DRM_UT_KMS, "out of vcpi ids %d\n", ret); |
| 1246 | goto out_unlock; |
| 1247 | } |
| 1248 | |
| 1249 | set_bit(ret, &mgr->payload_mask); |
| 1250 | set_bit(vcpi_ret, &mgr->vcpi_mask); |
| 1251 | vcpi->vcpi = vcpi_ret + 1; |
| 1252 | mgr->proposed_vcpis[ret - 1] = vcpi; |
| 1253 | out_unlock: |
| 1254 | mutex_unlock(&mgr->payload_lock)rw_exit_write(&mgr->payload_lock); |
| 1255 | return ret; |
| 1256 | } |
| 1257 | |
| 1258 | static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, |
| 1259 | int vcpi) |
| 1260 | { |
| 1261 | int i; |
| 1262 | |
| 1263 | if (vcpi == 0) |
| 1264 | return; |
| 1265 | |
| 1266 | mutex_lock(&mgr->payload_lock)rw_enter_write(&mgr->payload_lock); |
| 1267 | DRM_DEBUG_KMS("putting payload %d\n", vcpi)__drm_dbg(DRM_UT_KMS, "putting payload %d\n", vcpi); |
| 1268 | clear_bit(vcpi - 1, &mgr->vcpi_mask); |
| 1269 | |
| 1270 | for (i = 0; i < mgr->max_payloads; i++) { |
| 1271 | if (mgr->proposed_vcpis[i] && |
| 1272 | mgr->proposed_vcpis[i]->vcpi == vcpi) { |
| 1273 | mgr->proposed_vcpis[i] = NULL((void *)0); |
| 1274 | clear_bit(i + 1, &mgr->payload_mask); |
| 1275 | } |
| 1276 | } |
| 1277 | mutex_unlock(&mgr->payload_lock)rw_exit_write(&mgr->payload_lock); |
| 1278 | } |
| 1279 | |
| 1280 | static bool_Bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, |
| 1281 | struct drm_dp_sideband_msg_tx *txmsg) |
| 1282 | { |
| 1283 | unsigned int state; |
| 1284 | |
| 1285 | /* |
| 1286 | * All updates to txmsg->state are protected by mgr->qlock, and the two |
| 1287 | * cases we check here are terminal states. For those the barriers |
| 1288 | * provided by the wake_up/wait_event pair are enough. |
| 1289 | */ |
| 1290 | state = READ_ONCE(txmsg->state)({ typeof(txmsg->state) __tmp = *(volatile typeof(txmsg-> state) *)&(txmsg->state); membar_datadep_consumer(); __tmp ; }); |
| 1291 | return (state == DRM_DP_SIDEBAND_TX_RX3 || |
| 1292 | state == DRM_DP_SIDEBAND_TX_TIMEOUT4); |
| 1293 | } |
| 1294 | |
| 1295 | static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, |
| 1296 | struct drm_dp_sideband_msg_tx *txmsg) |
| 1297 | { |
| 1298 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
| 1299 | unsigned long wait_timeout = msecs_to_jiffies(4000)(((uint64_t)(4000)) * hz / 1000); |
| 1300 | unsigned long wait_expires = jiffies + wait_timeout; |
| 1301 | int ret; |
| 1302 | |
| 1303 | for (;;) { |
| 1304 | /* |
| 1305 | * If the driver provides a way for this, change to |
| 1306 | * poll-waiting for the MST reply interrupt if we didn't receive |
| 1307 | * it for 50 msec. This would cater for cases where the HPD |
| 1308 | * pulse signal got lost somewhere, even though the sink raised |
| 1309 | * the corresponding MST interrupt correctly. One example is the |
| 1310 | * Club 3D CAC-1557 TypeC -> DP adapter which for some reason |
| 1311 | * filters out short pulses with a duration less than ~540 usec. |
| 1312 | * |
| 1313 | * The poll period is 50 msec to avoid missing an interrupt |
| 1314 | * after the sink has cleared it (after a 110msec timeout |
| 1315 | * since it raised the interrupt). |
| 1316 | */ |
| 1317 | ret = wait_event_timeout(mgr->tx_waitq,({ long __ret = mgr->cbs->poll_hpd_irq ? (((uint64_t)(50 )) * hz / 1000) : wait_timeout; if (!(check_txmsg_state(mgr, txmsg ))) __ret = ({ long ret = mgr->cbs->poll_hpd_irq ? (((uint64_t )(50)) * hz / 1000) : wait_timeout; do { int __error; unsigned long deadline; ((!cold) ? (void)0 : __assert("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c" , 1321, "!cold")); mtx_enter(&sch_mtx); deadline = jiffies + ret; __error = msleep(&mgr->tx_waitq, &sch_mtx, 0, "drmweti", ret); ret = deadline - jiffies; if (__error == -1 || __error == 4) { ret = -4; mtx_leave(&sch_mtx); break ; } if ((mgr->cbs->poll_hpd_irq ? (((uint64_t)(50)) * hz / 1000) : wait_timeout) > 0 && (ret <= 0 || __error == 35)) { mtx_leave(&sch_mtx); ret = ((check_txmsg_state (mgr, txmsg))) ? 1 : 0; break; } mtx_leave(&sch_mtx); } while (ret > 0 && !(check_txmsg_state(mgr, txmsg))); ret ; }); __ret; }) |
| 1318 | check_txmsg_state(mgr, txmsg),({ long __ret = mgr->cbs->poll_hpd_irq ? (((uint64_t)(50 )) * hz / 1000) : wait_timeout; if (!(check_txmsg_state(mgr, txmsg ))) __ret = ({ long ret = mgr->cbs->poll_hpd_irq ? (((uint64_t )(50)) * hz / 1000) : wait_timeout; do { int __error; unsigned long deadline; ((!cold) ? (void)0 : __assert("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c" , 1321, "!cold")); mtx_enter(&sch_mtx); deadline = jiffies + ret; __error = msleep(&mgr->tx_waitq, &sch_mtx, 0, "drmweti", ret); ret = deadline - jiffies; if (__error == -1 || __error == 4) { ret = -4; mtx_leave(&sch_mtx); break ; } if ((mgr->cbs->poll_hpd_irq ? (((uint64_t)(50)) * hz / 1000) : wait_timeout) > 0 && (ret <= 0 || __error == 35)) { mtx_leave(&sch_mtx); ret = ((check_txmsg_state (mgr, txmsg))) ? 1 : 0; break; } mtx_leave(&sch_mtx); } while (ret > 0 && !(check_txmsg_state(mgr, txmsg))); ret ; }); __ret; }) |
| 1319 | mgr->cbs->poll_hpd_irq ?({ long __ret = mgr->cbs->poll_hpd_irq ? (((uint64_t)(50 )) * hz / 1000) : wait_timeout; if (!(check_txmsg_state(mgr, txmsg ))) __ret = ({ long ret = mgr->cbs->poll_hpd_irq ? (((uint64_t )(50)) * hz / 1000) : wait_timeout; do { int __error; unsigned long deadline; ((!cold) ? (void)0 : __assert("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c" , 1321, "!cold")); mtx_enter(&sch_mtx); deadline = jiffies + ret; __error = msleep(&mgr->tx_waitq, &sch_mtx, 0, "drmweti", ret); ret = deadline - jiffies; if (__error == -1 || __error == 4) { ret = -4; mtx_leave(&sch_mtx); break ; } if ((mgr->cbs->poll_hpd_irq ? (((uint64_t)(50)) * hz / 1000) : wait_timeout) > 0 && (ret <= 0 || __error == 35)) { mtx_leave(&sch_mtx); ret = ((check_txmsg_state (mgr, txmsg))) ? 1 : 0; break; } mtx_leave(&sch_mtx); } while (ret > 0 && !(check_txmsg_state(mgr, txmsg))); ret ; }); __ret; }) |
| 1320 | msecs_to_jiffies(50) :({ long __ret = mgr->cbs->poll_hpd_irq ? (((uint64_t)(50 )) * hz / 1000) : wait_timeout; if (!(check_txmsg_state(mgr, txmsg ))) __ret = ({ long ret = mgr->cbs->poll_hpd_irq ? (((uint64_t )(50)) * hz / 1000) : wait_timeout; do { int __error; unsigned long deadline; ((!cold) ? (void)0 : __assert("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c" , 1321, "!cold")); mtx_enter(&sch_mtx); deadline = jiffies + ret; __error = msleep(&mgr->tx_waitq, &sch_mtx, 0, "drmweti", ret); ret = deadline - jiffies; if (__error == -1 || __error == 4) { ret = -4; mtx_leave(&sch_mtx); break ; } if ((mgr->cbs->poll_hpd_irq ? (((uint64_t)(50)) * hz / 1000) : wait_timeout) > 0 && (ret <= 0 || __error == 35)) { mtx_leave(&sch_mtx); ret = ((check_txmsg_state (mgr, txmsg))) ? 1 : 0; break; } mtx_leave(&sch_mtx); } while (ret > 0 && !(check_txmsg_state(mgr, txmsg))); ret ; }); __ret; }) |
| 1321 | wait_timeout)({ long __ret = mgr->cbs->poll_hpd_irq ? (((uint64_t)(50 )) * hz / 1000) : wait_timeout; if (!(check_txmsg_state(mgr, txmsg ))) __ret = ({ long ret = mgr->cbs->poll_hpd_irq ? (((uint64_t )(50)) * hz / 1000) : wait_timeout; do { int __error; unsigned long deadline; ((!cold) ? (void)0 : __assert("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c" , 1321, "!cold")); mtx_enter(&sch_mtx); deadline = jiffies + ret; __error = msleep(&mgr->tx_waitq, &sch_mtx, 0, "drmweti", ret); ret = deadline - jiffies; if (__error == -1 || __error == 4) { ret = -4; mtx_leave(&sch_mtx); break ; } if ((mgr->cbs->poll_hpd_irq ? (((uint64_t)(50)) * hz / 1000) : wait_timeout) > 0 && (ret <= 0 || __error == 35)) { mtx_leave(&sch_mtx); ret = ((check_txmsg_state (mgr, txmsg))) ? 1 : 0; break; } mtx_leave(&sch_mtx); } while (ret > 0 && !(check_txmsg_state(mgr, txmsg))); ret ; }); __ret; }); |
| 1322 | |
| 1323 | if (ret || !mgr->cbs->poll_hpd_irq || |
| 1324 | time_after(jiffies, wait_expires)((long)(wait_expires) - (long)(jiffies) < 0)) |
| 1325 | break; |
| 1326 | |
| 1327 | mgr->cbs->poll_hpd_irq(mgr); |
| 1328 | } |
| 1329 | |
| 1330 | mutex_lock(&mgr->qlock)rw_enter_write(&mgr->qlock); |
| 1331 | if (ret > 0) { |
| 1332 | if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT4) { |
| 1333 | ret = -EIO5; |
| 1334 | goto out; |
| 1335 | } |
| 1336 | } else { |
| 1337 | DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno)__drm_dbg(DRM_UT_KMS, "timedout msg send %p %d %d\n", txmsg, txmsg ->state, txmsg->seqno); |
| 1338 | |
| 1339 | /* dump some state */ |
| 1340 | ret = -EIO5; |
| 1341 | |
| 1342 | /* remove from q */ |
| 1343 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED0 || |
| 1344 | txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND1 || |
| 1345 | txmsg->state == DRM_DP_SIDEBAND_TX_SENT2) |
| 1346 | list_del(&txmsg->next); |
| 1347 | } |
| 1348 | out: |
| 1349 | if (unlikely(ret == -EIO)__builtin_expect(!!(ret == -5), 0) && drm_debug_enabled(DRM_UT_DP)) { |
| 1350 | struct drm_printer p = drm_debug_printer(DBG_PREFIX"[dp_mst]"); |
| 1351 | |
| 1352 | drm_dp_mst_dump_sideband_msg_tx(&p, txmsg); |
| 1353 | } |
| 1354 | mutex_unlock(&mgr->qlock)rw_exit_write(&mgr->qlock); |
| 1355 | |
| 1356 | drm_dp_mst_kick_tx(mgr); |
| 1357 | return ret; |
| 1358 | } |
| 1359 | |
| 1360 | static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) |
| 1361 | { |
| 1362 | struct drm_dp_mst_branch *mstb; |
| 1363 | |
| 1364 | mstb = kzalloc(sizeof(*mstb), GFP_KERNEL(0x0001 | 0x0004)); |
| 1365 | if (!mstb) |
| 1366 | return NULL((void *)0); |
| 1367 | |
| 1368 | mstb->lct = lct; |
| 1369 | if (lct > 1) |
| 1370 | memcpy(mstb->rad, rad, lct / 2)__builtin_memcpy((mstb->rad), (rad), (lct / 2)); |
| 1371 | INIT_LIST_HEAD(&mstb->ports); |
| 1372 | kref_init(&mstb->topology_kref); |
| 1373 | kref_init(&mstb->malloc_kref); |
| 1374 | return mstb; |
| 1375 | } |
| 1376 | |
| 1377 | static void drm_dp_free_mst_branch_device(struct kref *kref) |
| 1378 | { |
| 1379 | struct drm_dp_mst_branch *mstb = |
| 1380 | container_of(kref, struct drm_dp_mst_branch, malloc_kref)({ const __typeof( ((struct drm_dp_mst_branch *)0)->malloc_kref ) *__mptr = (kref); (struct drm_dp_mst_branch *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_branch, malloc_kref) ) ;}); |
| 1381 | |
| 1382 | if (mstb->port_parent) |
| 1383 | drm_dp_mst_put_port_malloc(mstb->port_parent); |
| 1384 | |
| 1385 | kfree(mstb); |
| 1386 | } |
| 1387 | |
| 1388 | /** |
| 1389 | * DOC: Branch device and port refcounting |
| 1390 | * |
| 1391 | * Topology refcount overview |
| 1392 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 1393 | * |
| 1394 | * The refcounting schemes for &struct drm_dp_mst_branch and &struct |
| 1395 | * drm_dp_mst_port are somewhat unusual. Both ports and branch devices have |
| 1396 | * two different kinds of refcounts: topology refcounts, and malloc refcounts. |
| 1397 | * |
| 1398 | * Topology refcounts are not exposed to drivers, and are handled internally |
| 1399 | * by the DP MST helpers. The helpers use them in order to prevent the |
| 1400 | * in-memory topology state from being changed in the middle of critical |
| 1401 | * operations like changing the internal state of payload allocations. This |
| 1402 | * means each branch and port will be considered to be connected to the rest |
| 1403 | * of the topology until its topology refcount reaches zero. Additionally, |
| 1404 | * for ports this means that their associated &struct drm_connector will stay |
| 1405 | * registered with userspace until the port's refcount reaches 0. |
| 1406 | * |
| 1407 | * Malloc refcount overview |
| 1408 | * ~~~~~~~~~~~~~~~~~~~~~~~~ |
| 1409 | * |
| 1410 | * Malloc references are used to keep a &struct drm_dp_mst_port or &struct |
| 1411 | * drm_dp_mst_branch allocated even after all of its topology references have |
| 1412 | * been dropped, so that the driver or MST helpers can safely access each |
| 1413 | * branch's last known state before it was disconnected from the topology. |
| 1414 | * When the malloc refcount of a port or branch reaches 0, the memory |
| 1415 | * allocation containing the &struct drm_dp_mst_branch or &struct |
| 1416 | * drm_dp_mst_port respectively will be freed. |
| 1417 | * |
| 1418 | * For &struct drm_dp_mst_branch, malloc refcounts are not currently exposed |
| 1419 | * to drivers. As of writing this documentation, there are no drivers that |
| 1420 | * have a usecase for accessing &struct drm_dp_mst_branch outside of the MST |
| 1421 | * helpers. Exposing this API to drivers in a race-free manner would take more |
| 1422 | * tweaking of the refcounting scheme, however patches are welcome provided |
| 1423 | * there is a legitimate driver usecase for this. |
| 1424 | * |
| 1425 | * Refcount relationships in a topology |
| 1426 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 1427 | * |
| 1428 | * Let's take a look at why the relationship between topology and malloc |
| 1429 | * refcounts is designed the way it is. |
| 1430 | * |
| 1431 | * .. kernel-figure:: dp-mst/topology-figure-1.dot |
| 1432 | * |
| 1433 | * An example of topology and malloc refs in a DP MST topology with two |
| 1434 | * active payloads. Topology refcount increments are indicated by solid |
| 1435 | * lines, and malloc refcount increments are indicated by dashed lines. |
| 1436 | * Each starts from the branch which incremented the refcount, and ends at |
| 1437 | * the branch to which the refcount belongs to, i.e. the arrow points the |
| 1438 | * same way as the C pointers used to reference a structure. |
| 1439 | * |
| 1440 | * As you can see in the above figure, every branch increments the topology |
| 1441 | * refcount of its children, and increments the malloc refcount of its |
| 1442 | * parent. Additionally, every payload increments the malloc refcount of its |
| 1443 | * assigned port by 1. |
| 1444 | * |
| 1445 | * So, what would happen if MSTB #3 from the above figure was unplugged from |
| 1446 | * the system, but the driver hadn't yet removed payload #2 from port #3? The |
| 1447 | * topology would start to look like the figure below. |
| 1448 | * |
| 1449 | * .. kernel-figure:: dp-mst/topology-figure-2.dot |
| 1450 | * |
| 1451 | * Ports and branch devices which have been released from memory are |
| 1452 | * colored grey, and references which have been removed are colored red. |
| 1453 | * |
| 1454 | * Whenever a port or branch device's topology refcount reaches zero, it will |
| 1455 | * decrement the topology refcounts of all its children, the malloc refcount |
| 1456 | * of its parent, and finally its own malloc refcount. For MSTB #4 and port |
| 1457 | * #4, this means they both have been disconnected from the topology and freed |
| 1458 | * from memory. But, because payload #2 is still holding a reference to port |
| 1459 | * #3, port #3 is removed from the topology but its &struct drm_dp_mst_port |
| 1460 | * is still accessible from memory. This also means port #3 has not yet |
| 1461 | * decremented the malloc refcount of MSTB #3, so its &struct |
| 1462 | * drm_dp_mst_branch will also stay allocated in memory until port #3's |
| 1463 | * malloc refcount reaches 0. |
| 1464 | * |
| 1465 | * This relationship is necessary because in order to release payload #2, we |
| 1466 | * need to be able to figure out the last relative of port #3 that's still |
| 1467 | * connected to the topology. In this case, we would travel up the topology as |
| 1468 | * shown below. |
| 1469 | * |
| 1470 | * .. kernel-figure:: dp-mst/topology-figure-3.dot |
| 1471 | * |
| 1472 | * And finally, remove payload #2 by communicating with port #2 through |
| 1473 | * sideband transactions. |
| 1474 | */ |
| 1475 | |
| 1476 | /** |
| 1477 | * drm_dp_mst_get_mstb_malloc() - Increment the malloc refcount of a branch |
| 1478 | * device |
| 1479 | * @mstb: The &struct drm_dp_mst_branch to increment the malloc refcount of |
| 1480 | * |
| 1481 | * Increments &drm_dp_mst_branch.malloc_kref. When |
| 1482 | * &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb |
| 1483 | * will be released and @mstb may no longer be used. |
| 1484 | * |
| 1485 | * See also: drm_dp_mst_put_mstb_malloc() |
| 1486 | */ |
| 1487 | static void |
| 1488 | drm_dp_mst_get_mstb_malloc(struct drm_dp_mst_branch *mstb) |
| 1489 | { |
| 1490 | kref_get(&mstb->malloc_kref); |
| 1491 | DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref))__drm_dbg(DRM_UT_CORE, "mstb %p (%d)\n", mstb, kref_read(& mstb->malloc_kref)); |
| 1492 | } |
| 1493 | |
| 1494 | /** |
| 1495 | * drm_dp_mst_put_mstb_malloc() - Decrement the malloc refcount of a branch |
| 1496 | * device |
| 1497 | * @mstb: The &struct drm_dp_mst_branch to decrement the malloc refcount of |
| 1498 | * |
| 1499 | * Decrements &drm_dp_mst_branch.malloc_kref. When |
| 1500 | * &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb |
| 1501 | * will be released and @mstb may no longer be used. |
| 1502 | * |
| 1503 | * See also: drm_dp_mst_get_mstb_malloc() |
| 1504 | */ |
| 1505 | static void |
| 1506 | drm_dp_mst_put_mstb_malloc(struct drm_dp_mst_branch *mstb) |
| 1507 | { |
| 1508 | DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref) - 1)__drm_dbg(DRM_UT_CORE, "mstb %p (%d)\n", mstb, kref_read(& mstb->malloc_kref) - 1); |
| 1509 | kref_put(&mstb->malloc_kref, drm_dp_free_mst_branch_device); |
| 1510 | } |
| 1511 | |
| 1512 | static void drm_dp_free_mst_port(struct kref *kref) |
| 1513 | { |
| 1514 | struct drm_dp_mst_port *port = |
| 1515 | container_of(kref, struct drm_dp_mst_port, malloc_kref)({ const __typeof( ((struct drm_dp_mst_port *)0)->malloc_kref ) *__mptr = (kref); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_port, malloc_kref) ); }); |
| 1516 | |
| 1517 | drm_dp_mst_put_mstb_malloc(port->parent); |
| 1518 | kfree(port); |
| 1519 | } |
| 1520 | |
| 1521 | /** |
| 1522 | * drm_dp_mst_get_port_malloc() - Increment the malloc refcount of an MST port |
| 1523 | * @port: The &struct drm_dp_mst_port to increment the malloc refcount of |
| 1524 | * |
| 1525 | * Increments &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref |
| 1526 | * reaches 0, the memory allocation for @port will be released and @port may |
| 1527 | * no longer be used. |
| 1528 | * |
| 1529 | * Because @port could potentially be freed at any time by the DP MST helpers |
| 1530 | * if &drm_dp_mst_port.malloc_kref reaches 0, including during a call to this |
| 1531 | * function, drivers that which to make use of &struct drm_dp_mst_port should |
| 1532 | * ensure that they grab at least one main malloc reference to their MST ports |
| 1533 | * in &drm_dp_mst_topology_cbs.add_connector. This callback is called before |
| 1534 | * there is any chance for &drm_dp_mst_port.malloc_kref to reach 0. |
| 1535 | * |
| 1536 | * See also: drm_dp_mst_put_port_malloc() |
| 1537 | */ |
| 1538 | void |
| 1539 | drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port) |
| 1540 | { |
| 1541 | kref_get(&port->malloc_kref); |
| 1542 | DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->malloc_kref))__drm_dbg(DRM_UT_CORE, "port %p (%d)\n", port, kref_read(& port->malloc_kref)); |
| 1543 | } |
| 1544 | EXPORT_SYMBOL(drm_dp_mst_get_port_malloc); |
| 1545 | |
| 1546 | /** |
| 1547 | * drm_dp_mst_put_port_malloc() - Decrement the malloc refcount of an MST port |
| 1548 | * @port: The &struct drm_dp_mst_port to decrement the malloc refcount of |
| 1549 | * |
| 1550 | * Decrements &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref |
| 1551 | * reaches 0, the memory allocation for @port will be released and @port may |
| 1552 | * no longer be used. |
| 1553 | * |
| 1554 | * See also: drm_dp_mst_get_port_malloc() |
| 1555 | */ |
| 1556 | void |
| 1557 | drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port) |
| 1558 | { |
| 1559 | DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->malloc_kref) - 1)__drm_dbg(DRM_UT_CORE, "port %p (%d)\n", port, kref_read(& port->malloc_kref) - 1); |
| 1560 | kref_put(&port->malloc_kref, drm_dp_free_mst_port); |
| 1561 | } |
| 1562 | EXPORT_SYMBOL(drm_dp_mst_put_port_malloc); |
| 1563 | |
| 1564 | #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)0 |
| 1565 | |
| 1566 | #define STACK_DEPTH 8 |
| 1567 | |
| 1568 | static noinline__attribute__((__noinline__)) void |
| 1569 | __topology_ref_save(struct drm_dp_mst_topology_mgr *mgr, |
| 1570 | struct drm_dp_mst_topology_ref_history *history, |
| 1571 | enum drm_dp_mst_topology_ref_type type) |
| 1572 | { |
| 1573 | struct drm_dp_mst_topology_ref_entry *entry = NULL((void *)0); |
| 1574 | depot_stack_handle_t backtrace; |
| 1575 | ulong stack_entries[STACK_DEPTH]; |
| 1576 | uint n; |
| 1577 | int i; |
| 1578 | |
| 1579 | n = stack_trace_save(stack_entries, ARRAY_SIZE(stack_entries)(sizeof((stack_entries)) / sizeof((stack_entries)[0])), 1); |
| 1580 | backtrace = stack_depot_save(stack_entries, n, GFP_KERNEL(0x0001 | 0x0004)); |
| 1581 | if (!backtrace) |
| 1582 | return; |
| 1583 | |
| 1584 | /* Try to find an existing entry for this backtrace */ |
| 1585 | for (i = 0; i < history->len; i++) { |
| 1586 | if (history->entries[i].backtrace == backtrace) { |
| 1587 | entry = &history->entries[i]; |
| 1588 | break; |
| 1589 | } |
| 1590 | } |
| 1591 | |
| 1592 | /* Otherwise add one */ |
| 1593 | if (!entry) { |
| 1594 | struct drm_dp_mst_topology_ref_entry *new; |
| 1595 | int new_len = history->len + 1; |
| 1596 | |
| 1597 | new = krealloc(history->entries, sizeof(*new) * new_len, |
| 1598 | GFP_KERNEL(0x0001 | 0x0004)); |
| 1599 | if (!new) |
| 1600 | return; |
| 1601 | |
| 1602 | entry = &new[history->len]; |
| 1603 | history->len = new_len; |
| 1604 | history->entries = new; |
| 1605 | |
| 1606 | entry->backtrace = backtrace; |
| 1607 | entry->type = type; |
| 1608 | entry->count = 0; |
| 1609 | } |
| 1610 | entry->count++; |
| 1611 | entry->ts_nsec = ktime_get_ns(); |
| 1612 | } |
| 1613 | |
| 1614 | static int |
| 1615 | topology_ref_history_cmp(const void *a, const void *b) |
| 1616 | { |
| 1617 | const struct drm_dp_mst_topology_ref_entry *entry_a = a, *entry_b = b; |
| 1618 | |
| 1619 | if (entry_a->ts_nsec > entry_b->ts_nsec) |
| 1620 | return 1; |
| 1621 | else if (entry_a->ts_nsec < entry_b->ts_nsec) |
| 1622 | return -1; |
| 1623 | else |
| 1624 | return 0; |
| 1625 | } |
| 1626 | |
| 1627 | static inline const char * |
| 1628 | topology_ref_type_to_str(enum drm_dp_mst_topology_ref_type type) |
| 1629 | { |
| 1630 | if (type == DRM_DP_MST_TOPOLOGY_REF_GET) |
| 1631 | return "get"; |
| 1632 | else |
| 1633 | return "put"; |
| 1634 | } |
| 1635 | |
| 1636 | static void |
| 1637 | __dump_topology_ref_history(struct drm_dp_mst_topology_ref_history *history, |
| 1638 | void *ptr, const char *type_str) |
| 1639 | { |
| 1640 | struct drm_printer p = drm_debug_printer(DBG_PREFIX"[dp_mst]"); |
| 1641 | char *buf = kzalloc(PAGE_SIZE(1 << 12), GFP_KERNEL(0x0001 | 0x0004)); |
| 1642 | int i; |
| 1643 | |
| 1644 | if (!buf) |
| 1645 | return; |
| 1646 | |
| 1647 | if (!history->len) |
| 1648 | goto out; |
| 1649 | |
| 1650 | /* First, sort the list so that it goes from oldest to newest |
| 1651 | * reference entry |
| 1652 | */ |
| 1653 | sort(history->entries, history->len, sizeof(*history->entries), |
| 1654 | topology_ref_history_cmp, NULL((void *)0)); |
| 1655 | |
| 1656 | drm_printf(&p, "%s (%p) topology count reached 0, dumping history:\n", |
| 1657 | type_str, ptr); |
| 1658 | |
| 1659 | for (i = 0; i < history->len; i++) { |
| 1660 | const struct drm_dp_mst_topology_ref_entry *entry = |
| 1661 | &history->entries[i]; |
| 1662 | ulong *entries; |
| 1663 | uint nr_entries; |
| 1664 | u64 ts_nsec = entry->ts_nsec; |
| 1665 | u32 rem_nsec = do_div(ts_nsec, 1000000000)({ uint32_t __base = (1000000000); uint32_t __rem = ((uint64_t )(ts_nsec)) % __base; (ts_nsec) = ((uint64_t)(ts_nsec)) / __base ; __rem; }); |
| 1666 | |
| 1667 | nr_entries = stack_depot_fetch(entry->backtrace, &entries); |
| 1668 | stack_trace_snprint(buf, PAGE_SIZE(1 << 12), entries, nr_entries, 4); |
| 1669 | |
| 1670 | drm_printf(&p, " %d %ss (last at %5llu.%06u):\n%s", |
| 1671 | entry->count, |
| 1672 | topology_ref_type_to_str(entry->type), |
| 1673 | ts_nsec, rem_nsec / 1000, buf); |
| 1674 | } |
| 1675 | |
| 1676 | /* Now free the history, since this is the only time we expose it */ |
| 1677 | kfree(history->entries); |
| 1678 | out: |
| 1679 | kfree(buf); |
| 1680 | } |
| 1681 | |
| 1682 | static __always_inline__attribute__((__always_inline__)) void |
| 1683 | drm_dp_mst_dump_mstb_topology_history(struct drm_dp_mst_branch *mstb) |
| 1684 | { |
| 1685 | __dump_topology_ref_history(&mstb->topology_ref_history, mstb, |
| 1686 | "MSTB"); |
| 1687 | } |
| 1688 | |
| 1689 | static __always_inline__attribute__((__always_inline__)) void |
| 1690 | drm_dp_mst_dump_port_topology_history(struct drm_dp_mst_port *port) |
| 1691 | { |
| 1692 | __dump_topology_ref_history(&port->topology_ref_history, port, |
| 1693 | "Port"); |
| 1694 | } |
| 1695 | |
| 1696 | static __always_inline__attribute__((__always_inline__)) void |
| 1697 | save_mstb_topology_ref(struct drm_dp_mst_branch *mstb, |
| 1698 | enum drm_dp_mst_topology_ref_type type) |
| 1699 | { |
| 1700 | __topology_ref_save(mstb->mgr, &mstb->topology_ref_history, type); |
| 1701 | } |
| 1702 | |
| 1703 | static __always_inline__attribute__((__always_inline__)) void |
| 1704 | save_port_topology_ref(struct drm_dp_mst_port *port, |
| 1705 | enum drm_dp_mst_topology_ref_type type) |
| 1706 | { |
| 1707 | __topology_ref_save(port->mgr, &port->topology_ref_history, type); |
| 1708 | } |
| 1709 | |
| 1710 | static inline void |
| 1711 | topology_ref_history_lock(struct drm_dp_mst_topology_mgr *mgr) |
| 1712 | { |
| 1713 | mutex_lock(&mgr->topology_ref_history_lock)rw_enter_write(&mgr->topology_ref_history_lock); |
| 1714 | } |
| 1715 | |
| 1716 | static inline void |
| 1717 | topology_ref_history_unlock(struct drm_dp_mst_topology_mgr *mgr) |
| 1718 | { |
| 1719 | mutex_unlock(&mgr->topology_ref_history_lock)rw_exit_write(&mgr->topology_ref_history_lock); |
| 1720 | } |
| 1721 | #else |
| 1722 | static inline void |
| 1723 | topology_ref_history_lock(struct drm_dp_mst_topology_mgr *mgr) {} |
| 1724 | static inline void |
| 1725 | topology_ref_history_unlock(struct drm_dp_mst_topology_mgr *mgr) {} |
| 1726 | static inline void |
| 1727 | drm_dp_mst_dump_mstb_topology_history(struct drm_dp_mst_branch *mstb) {} |
| 1728 | static inline void |
| 1729 | drm_dp_mst_dump_port_topology_history(struct drm_dp_mst_port *port) {} |
| 1730 | #define save_mstb_topology_ref(mstb, type) |
| 1731 | #define save_port_topology_ref(port, type) |
| 1732 | #endif |
| 1733 | |
| 1734 | static void drm_dp_destroy_mst_branch_device(struct kref *kref) |
| 1735 | { |
| 1736 | struct drm_dp_mst_branch *mstb = |
| 1737 | container_of(kref, struct drm_dp_mst_branch, topology_kref)({ const __typeof( ((struct drm_dp_mst_branch *)0)->topology_kref ) *__mptr = (kref); (struct drm_dp_mst_branch *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_branch, topology_kref ) );}); |
| 1738 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
| 1739 | |
| 1740 | drm_dp_mst_dump_mstb_topology_history(mstb); |
| 1741 | |
| 1742 | INIT_LIST_HEAD(&mstb->destroy_next); |
| 1743 | |
| 1744 | /* |
| 1745 | * This can get called under mgr->mutex, so we need to perform the |
| 1746 | * actual destruction of the mstb in another worker |
| 1747 | */ |
| 1748 | mutex_lock(&mgr->delayed_destroy_lock)rw_enter_write(&mgr->delayed_destroy_lock); |
| 1749 | list_add(&mstb->destroy_next, &mgr->destroy_branch_device_list); |
| 1750 | mutex_unlock(&mgr->delayed_destroy_lock)rw_exit_write(&mgr->delayed_destroy_lock); |
| 1751 | queue_work(mgr->delayed_destroy_wq, &mgr->delayed_destroy_work); |
| 1752 | } |
| 1753 | |
| 1754 | /** |
| 1755 | * drm_dp_mst_topology_try_get_mstb() - Increment the topology refcount of a |
| 1756 | * branch device unless it's zero |
| 1757 | * @mstb: &struct drm_dp_mst_branch to increment the topology refcount of |
| 1758 | * |
| 1759 | * Attempts to grab a topology reference to @mstb, if it hasn't yet been |
| 1760 | * removed from the topology (e.g. &drm_dp_mst_branch.topology_kref has |
| 1761 | * reached 0). Holding a topology reference implies that a malloc reference |
| 1762 | * will be held to @mstb as long as the user holds the topology reference. |
| 1763 | * |
| 1764 | * Care should be taken to ensure that the user has at least one malloc |
| 1765 | * reference to @mstb. If you already have a topology reference to @mstb, you |
| 1766 | * should use drm_dp_mst_topology_get_mstb() instead. |
| 1767 | * |
| 1768 | * See also: |
| 1769 | * drm_dp_mst_topology_get_mstb() |
| 1770 | * drm_dp_mst_topology_put_mstb() |
| 1771 | * |
| 1772 | * Returns: |
| 1773 | * * 1: A topology reference was grabbed successfully |
| 1774 | * * 0: @port is no longer in the topology, no reference was grabbed |
| 1775 | */ |
| 1776 | static int __must_check |
| 1777 | drm_dp_mst_topology_try_get_mstb(struct drm_dp_mst_branch *mstb) |
| 1778 | { |
| 1779 | int ret; |
| 1780 | |
| 1781 | topology_ref_history_lock(mstb->mgr); |
| 1782 | ret = kref_get_unless_zero(&mstb->topology_kref); |
| 1783 | if (ret) { |
| 1784 | DRM_DEBUG("mstb %p (%d)\n",__drm_dbg(DRM_UT_CORE, "mstb %p (%d)\n", mstb, kref_read(& mstb->topology_kref)) |
| 1785 | mstb, kref_read(&mstb->topology_kref))__drm_dbg(DRM_UT_CORE, "mstb %p (%d)\n", mstb, kref_read(& mstb->topology_kref)); |
| 1786 | save_mstb_topology_ref(mstb, DRM_DP_MST_TOPOLOGY_REF_GET); |
| 1787 | } |
| 1788 | |
| 1789 | topology_ref_history_unlock(mstb->mgr); |
| 1790 | |
| 1791 | return ret; |
| 1792 | } |
| 1793 | |
| 1794 | /** |
| 1795 | * drm_dp_mst_topology_get_mstb() - Increment the topology refcount of a |
| 1796 | * branch device |
| 1797 | * @mstb: The &struct drm_dp_mst_branch to increment the topology refcount of |
| 1798 | * |
| 1799 | * Increments &drm_dp_mst_branch.topology_refcount without checking whether or |
| 1800 | * not it's already reached 0. This is only valid to use in scenarios where |
| 1801 | * you are already guaranteed to have at least one active topology reference |
| 1802 | * to @mstb. Otherwise, drm_dp_mst_topology_try_get_mstb() must be used. |
| 1803 | * |
| 1804 | * See also: |
| 1805 | * drm_dp_mst_topology_try_get_mstb() |
| 1806 | * drm_dp_mst_topology_put_mstb() |
| 1807 | */ |
| 1808 | static void drm_dp_mst_topology_get_mstb(struct drm_dp_mst_branch *mstb) |
| 1809 | { |
| 1810 | topology_ref_history_lock(mstb->mgr); |
| 1811 | |
| 1812 | save_mstb_topology_ref(mstb, DRM_DP_MST_TOPOLOGY_REF_GET); |
| 1813 | WARN_ON(kref_read(&mstb->topology_kref) == 0)({ int __ret = !!(kref_read(&mstb->topology_kref) == 0 ); if (__ret) printf("WARNING %s failed at %s:%d\n", "kref_read(&mstb->topology_kref) == 0" , "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c", 1813); __builtin_expect (!!(__ret), 0); }); |
| 1814 | kref_get(&mstb->topology_kref); |
| 1815 | DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref))__drm_dbg(DRM_UT_CORE, "mstb %p (%d)\n", mstb, kref_read(& mstb->topology_kref)); |
| 1816 | |
| 1817 | topology_ref_history_unlock(mstb->mgr); |
| 1818 | } |
| 1819 | |
| 1820 | /** |
| 1821 | * drm_dp_mst_topology_put_mstb() - release a topology reference to a branch |
| 1822 | * device |
| 1823 | * @mstb: The &struct drm_dp_mst_branch to release the topology reference from |
| 1824 | * |
| 1825 | * Releases a topology reference from @mstb by decrementing |
| 1826 | * &drm_dp_mst_branch.topology_kref. |
| 1827 | * |
| 1828 | * See also: |
| 1829 | * drm_dp_mst_topology_try_get_mstb() |
| 1830 | * drm_dp_mst_topology_get_mstb() |
| 1831 | */ |
| 1832 | static void |
| 1833 | drm_dp_mst_topology_put_mstb(struct drm_dp_mst_branch *mstb) |
| 1834 | { |
| 1835 | topology_ref_history_lock(mstb->mgr); |
| 1836 | |
| 1837 | DRM_DEBUG("mstb %p (%d)\n",__drm_dbg(DRM_UT_CORE, "mstb %p (%d)\n", mstb, kref_read(& mstb->topology_kref) - 1) |
| 1838 | mstb, kref_read(&mstb->topology_kref) - 1)__drm_dbg(DRM_UT_CORE, "mstb %p (%d)\n", mstb, kref_read(& mstb->topology_kref) - 1); |
| 1839 | save_mstb_topology_ref(mstb, DRM_DP_MST_TOPOLOGY_REF_PUT); |
| 1840 | |
| 1841 | topology_ref_history_unlock(mstb->mgr); |
| 1842 | kref_put(&mstb->topology_kref, drm_dp_destroy_mst_branch_device); |
| 1843 | } |
| 1844 | |
| 1845 | static void drm_dp_destroy_port(struct kref *kref) |
| 1846 | { |
| 1847 | struct drm_dp_mst_port *port = |
| 1848 | container_of(kref, struct drm_dp_mst_port, topology_kref)({ const __typeof( ((struct drm_dp_mst_port *)0)->topology_kref ) *__mptr = (kref); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_port, topology_kref) ) ;}); |
| 1849 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
| 1850 | |
| 1851 | drm_dp_mst_dump_port_topology_history(port); |
| 1852 | |
| 1853 | /* There's nothing that needs locking to destroy an input port yet */ |
| 1854 | if (port->input) { |
| 1855 | drm_dp_mst_put_port_malloc(port); |
| 1856 | return; |
| 1857 | } |
| 1858 | |
| 1859 | kfree(port->cached_edid); |
| 1860 | |
| 1861 | /* |
| 1862 | * we can't destroy the connector here, as we might be holding the |
| 1863 | * mode_config.mutex from an EDID retrieval |
| 1864 | */ |
| 1865 | mutex_lock(&mgr->delayed_destroy_lock)rw_enter_write(&mgr->delayed_destroy_lock); |
| 1866 | list_add(&port->next, &mgr->destroy_port_list); |
| 1867 | mutex_unlock(&mgr->delayed_destroy_lock)rw_exit_write(&mgr->delayed_destroy_lock); |
| 1868 | queue_work(mgr->delayed_destroy_wq, &mgr->delayed_destroy_work); |
| 1869 | } |
| 1870 | |
| 1871 | /** |
| 1872 | * drm_dp_mst_topology_try_get_port() - Increment the topology refcount of a |
| 1873 | * port unless it's zero |
| 1874 | * @port: &struct drm_dp_mst_port to increment the topology refcount of |
| 1875 | * |
| 1876 | * Attempts to grab a topology reference to @port, if it hasn't yet been |
| 1877 | * removed from the topology (e.g. &drm_dp_mst_port.topology_kref has reached |
| 1878 | * 0). Holding a topology reference implies that a malloc reference will be |
| 1879 | * held to @port as long as the user holds the topology reference. |
| 1880 | * |
| 1881 | * Care should be taken to ensure that the user has at least one malloc |
| 1882 | * reference to @port. If you already have a topology reference to @port, you |
| 1883 | * should use drm_dp_mst_topology_get_port() instead. |
| 1884 | * |
| 1885 | * See also: |
| 1886 | * drm_dp_mst_topology_get_port() |
| 1887 | * drm_dp_mst_topology_put_port() |
| 1888 | * |
| 1889 | * Returns: |
| 1890 | * * 1: A topology reference was grabbed successfully |
| 1891 | * * 0: @port is no longer in the topology, no reference was grabbed |
| 1892 | */ |
| 1893 | static int __must_check |
| 1894 | drm_dp_mst_topology_try_get_port(struct drm_dp_mst_port *port) |
| 1895 | { |
| 1896 | int ret; |
| 1897 | |
| 1898 | topology_ref_history_lock(port->mgr); |
| 1899 | ret = kref_get_unless_zero(&port->topology_kref); |
| 1900 | if (ret) { |
| 1901 | DRM_DEBUG("port %p (%d)\n",__drm_dbg(DRM_UT_CORE, "port %p (%d)\n", port, kref_read(& port->topology_kref)) |
| 1902 | port, kref_read(&port->topology_kref))__drm_dbg(DRM_UT_CORE, "port %p (%d)\n", port, kref_read(& port->topology_kref)); |
| 1903 | save_port_topology_ref(port, DRM_DP_MST_TOPOLOGY_REF_GET); |
| 1904 | } |
| 1905 | |
| 1906 | topology_ref_history_unlock(port->mgr); |
| 1907 | return ret; |
| 1908 | } |
| 1909 | |
| 1910 | /** |
| 1911 | * drm_dp_mst_topology_get_port() - Increment the topology refcount of a port |
| 1912 | * @port: The &struct drm_dp_mst_port to increment the topology refcount of |
| 1913 | * |
| 1914 | * Increments &drm_dp_mst_port.topology_refcount without checking whether or |
| 1915 | * not it's already reached 0. This is only valid to use in scenarios where |
| 1916 | * you are already guaranteed to have at least one active topology reference |
| 1917 | * to @port. Otherwise, drm_dp_mst_topology_try_get_port() must be used. |
| 1918 | * |
| 1919 | * See also: |
| 1920 | * drm_dp_mst_topology_try_get_port() |
| 1921 | * drm_dp_mst_topology_put_port() |
| 1922 | */ |
| 1923 | static void drm_dp_mst_topology_get_port(struct drm_dp_mst_port *port) |
| 1924 | { |
| 1925 | topology_ref_history_lock(port->mgr); |
| 1926 | |
| 1927 | WARN_ON(kref_read(&port->topology_kref) == 0)({ int __ret = !!(kref_read(&port->topology_kref) == 0 ); if (__ret) printf("WARNING %s failed at %s:%d\n", "kref_read(&port->topology_kref) == 0" , "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c", 1927); __builtin_expect (!!(__ret), 0); }); |
| 1928 | kref_get(&port->topology_kref); |
| 1929 | DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->topology_kref))__drm_dbg(DRM_UT_CORE, "port %p (%d)\n", port, kref_read(& port->topology_kref)); |
| 1930 | save_port_topology_ref(port, DRM_DP_MST_TOPOLOGY_REF_GET); |
| 1931 | |
| 1932 | topology_ref_history_unlock(port->mgr); |
| 1933 | } |
| 1934 | |
| 1935 | /** |
| 1936 | * drm_dp_mst_topology_put_port() - release a topology reference to a port |
| 1937 | * @port: The &struct drm_dp_mst_port to release the topology reference from |
| 1938 | * |
| 1939 | * Releases a topology reference from @port by decrementing |
| 1940 | * &drm_dp_mst_port.topology_kref. |
| 1941 | * |
| 1942 | * See also: |
| 1943 | * drm_dp_mst_topology_try_get_port() |
| 1944 | * drm_dp_mst_topology_get_port() |
| 1945 | */ |
| 1946 | static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port) |
| 1947 | { |
| 1948 | topology_ref_history_lock(port->mgr); |
| 1949 | |
| 1950 | DRM_DEBUG("port %p (%d)\n",__drm_dbg(DRM_UT_CORE, "port %p (%d)\n", port, kref_read(& port->topology_kref) - 1) |
| 1951 | port, kref_read(&port->topology_kref) - 1)__drm_dbg(DRM_UT_CORE, "port %p (%d)\n", port, kref_read(& port->topology_kref) - 1); |
| 1952 | save_port_topology_ref(port, DRM_DP_MST_TOPOLOGY_REF_PUT); |
| 1953 | |
| 1954 | topology_ref_history_unlock(port->mgr); |
| 1955 | kref_put(&port->topology_kref, drm_dp_destroy_port); |
| 1956 | } |
| 1957 | |
| 1958 | static struct drm_dp_mst_branch * |
| 1959 | drm_dp_mst_topology_get_mstb_validated_locked(struct drm_dp_mst_branch *mstb, |
| 1960 | struct drm_dp_mst_branch *to_find) |
| 1961 | { |
| 1962 | struct drm_dp_mst_port *port; |
| 1963 | struct drm_dp_mst_branch *rmstb; |
| 1964 | |
| 1965 | if (to_find == mstb) |
| 1966 | return mstb; |
| 1967 | |
| 1968 | list_for_each_entry(port, &mstb->ports, next)for (port = ({ const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = ((&mstb->ports)->next); (__typeof(*port ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*port), next ) );}); &port->next != (&mstb->ports); port = ( { const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = (port->next.next); (__typeof(*port) *)( (char *)__mptr - __builtin_offsetof (__typeof(*port), next) );})) { |
| 1969 | if (port->mstb) { |
| 1970 | rmstb = drm_dp_mst_topology_get_mstb_validated_locked( |
| 1971 | port->mstb, to_find); |
| 1972 | if (rmstb) |
| 1973 | return rmstb; |
| 1974 | } |
| 1975 | } |
| 1976 | return NULL((void *)0); |
| 1977 | } |
| 1978 | |
| 1979 | static struct drm_dp_mst_branch * |
| 1980 | drm_dp_mst_topology_get_mstb_validated(struct drm_dp_mst_topology_mgr *mgr, |
| 1981 | struct drm_dp_mst_branch *mstb) |
| 1982 | { |
| 1983 | struct drm_dp_mst_branch *rmstb = NULL((void *)0); |
| 1984 | |
| 1985 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 1986 | if (mgr->mst_primary) { |
| 1987 | rmstb = drm_dp_mst_topology_get_mstb_validated_locked( |
| 1988 | mgr->mst_primary, mstb); |
| 1989 | |
| 1990 | if (rmstb && !drm_dp_mst_topology_try_get_mstb(rmstb)) |
| 1991 | rmstb = NULL((void *)0); |
| 1992 | } |
| 1993 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 1994 | return rmstb; |
| 1995 | } |
| 1996 | |
| 1997 | static struct drm_dp_mst_port * |
| 1998 | drm_dp_mst_topology_get_port_validated_locked(struct drm_dp_mst_branch *mstb, |
| 1999 | struct drm_dp_mst_port *to_find) |
| 2000 | { |
| 2001 | struct drm_dp_mst_port *port, *mport; |
| 2002 | |
| 2003 | list_for_each_entry(port, &mstb->ports, next)for (port = ({ const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = ((&mstb->ports)->next); (__typeof(*port ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*port), next ) );}); &port->next != (&mstb->ports); port = ( { const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = (port->next.next); (__typeof(*port) *)( (char *)__mptr - __builtin_offsetof (__typeof(*port), next) );})) { |
| 2004 | if (port == to_find) |
| 2005 | return port; |
| 2006 | |
| 2007 | if (port->mstb) { |
| 2008 | mport = drm_dp_mst_topology_get_port_validated_locked( |
| 2009 | port->mstb, to_find); |
| 2010 | if (mport) |
| 2011 | return mport; |
| 2012 | } |
| 2013 | } |
| 2014 | return NULL((void *)0); |
| 2015 | } |
| 2016 | |
| 2017 | static struct drm_dp_mst_port * |
| 2018 | drm_dp_mst_topology_get_port_validated(struct drm_dp_mst_topology_mgr *mgr, |
| 2019 | struct drm_dp_mst_port *port) |
| 2020 | { |
| 2021 | struct drm_dp_mst_port *rport = NULL((void *)0); |
| 2022 | |
| 2023 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 2024 | if (mgr->mst_primary) { |
| 2025 | rport = drm_dp_mst_topology_get_port_validated_locked( |
| 2026 | mgr->mst_primary, port); |
| 2027 | |
| 2028 | if (rport && !drm_dp_mst_topology_try_get_port(rport)) |
| 2029 | rport = NULL((void *)0); |
| 2030 | } |
| 2031 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 2032 | return rport; |
| 2033 | } |
| 2034 | |
| 2035 | static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) |
| 2036 | { |
| 2037 | struct drm_dp_mst_port *port; |
| 2038 | int ret; |
| 2039 | |
| 2040 | list_for_each_entry(port, &mstb->ports, next)for (port = ({ const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = ((&mstb->ports)->next); (__typeof(*port ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*port), next ) );}); &port->next != (&mstb->ports); port = ( { const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = (port->next.next); (__typeof(*port) *)( (char *)__mptr - __builtin_offsetof (__typeof(*port), next) );})) { |
| 2041 | if (port->port_num == port_num) { |
| 2042 | ret = drm_dp_mst_topology_try_get_port(port); |
| 2043 | return ret ? port : NULL((void *)0); |
| 2044 | } |
| 2045 | } |
| 2046 | |
| 2047 | return NULL((void *)0); |
| 2048 | } |
| 2049 | |
| 2050 | /* |
| 2051 | * calculate a new RAD for this MST branch device |
| 2052 | * if parent has an LCT of 2 then it has 1 nibble of RAD, |
| 2053 | * if parent has an LCT of 3 then it has 2 nibbles of RAD, |
| 2054 | */ |
| 2055 | static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, |
| 2056 | u8 *rad) |
| 2057 | { |
| 2058 | int parent_lct = port->parent->lct; |
| 2059 | int shift = 4; |
| 2060 | int idx = (parent_lct - 1) / 2; |
| 2061 | |
| 2062 | if (parent_lct > 1) { |
| 2063 | memcpy(rad, port->parent->rad, idx + 1)__builtin_memcpy((rad), (port->parent->rad), (idx + 1)); |
| 2064 | shift = (parent_lct % 2) ? 4 : 0; |
| 2065 | } else |
| 2066 | rad[0] = 0; |
| 2067 | |
| 2068 | rad[idx] |= port->port_num << shift; |
| 2069 | return parent_lct + 1; |
| 2070 | } |
| 2071 | |
| 2072 | static bool_Bool drm_dp_mst_is_end_device(u8 pdt, bool_Bool mcs) |
| 2073 | { |
| 2074 | switch (pdt) { |
| 2075 | case DP_PEER_DEVICE_DP_LEGACY_CONV0x4: |
| 2076 | case DP_PEER_DEVICE_SST_SINK0x3: |
| 2077 | return true1; |
| 2078 | case DP_PEER_DEVICE_MST_BRANCHING0x2: |
| 2079 | /* For sst branch device */ |
| 2080 | if (!mcs) |
| 2081 | return true1; |
| 2082 | |
| 2083 | return false0; |
| 2084 | } |
| 2085 | return true1; |
| 2086 | } |
| 2087 | |
| 2088 | static int |
| 2089 | drm_dp_port_set_pdt(struct drm_dp_mst_port *port, u8 new_pdt, |
| 2090 | bool_Bool new_mcs) |
| 2091 | { |
| 2092 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
| 2093 | struct drm_dp_mst_branch *mstb; |
| 2094 | u8 rad[8], lct; |
| 2095 | int ret = 0; |
| 2096 | |
| 2097 | if (port->pdt == new_pdt && port->mcs == new_mcs) |
| 2098 | return 0; |
| 2099 | |
| 2100 | /* Teardown the old pdt, if there is one */ |
| 2101 | if (port->pdt != DP_PEER_DEVICE_NONE0x0) { |
| 2102 | if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) { |
| 2103 | /* |
| 2104 | * If the new PDT would also have an i2c bus, |
| 2105 | * don't bother with reregistering it |
| 2106 | */ |
| 2107 | if (new_pdt != DP_PEER_DEVICE_NONE0x0 && |
| 2108 | drm_dp_mst_is_end_device(new_pdt, new_mcs)) { |
| 2109 | port->pdt = new_pdt; |
| 2110 | port->mcs = new_mcs; |
| 2111 | return 0; |
| 2112 | } |
| 2113 | |
| 2114 | /* remove i2c over sideband */ |
| 2115 | drm_dp_mst_unregister_i2c_bus(port); |
| 2116 | } else { |
| 2117 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 2118 | drm_dp_mst_topology_put_mstb(port->mstb); |
| 2119 | port->mstb = NULL((void *)0); |
| 2120 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 2121 | } |
| 2122 | } |
| 2123 | |
| 2124 | port->pdt = new_pdt; |
| 2125 | port->mcs = new_mcs; |
| 2126 | |
| 2127 | if (port->pdt != DP_PEER_DEVICE_NONE0x0) { |
| 2128 | if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) { |
| 2129 | /* add i2c over sideband */ |
| 2130 | ret = drm_dp_mst_register_i2c_bus(port); |
| 2131 | } else { |
| 2132 | lct = drm_dp_calculate_rad(port, rad); |
| 2133 | mstb = drm_dp_add_mst_branch_device(lct, rad); |
| 2134 | if (!mstb) { |
| 2135 | ret = -ENOMEM12; |
| 2136 | DRM_ERROR("Failed to create MSTB for port %p",__drm_err("Failed to create MSTB for port %p", port) |
| 2137 | port)__drm_err("Failed to create MSTB for port %p", port); |
| 2138 | goto out; |
| 2139 | } |
| 2140 | |
| 2141 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 2142 | port->mstb = mstb; |
| 2143 | mstb->mgr = port->mgr; |
| 2144 | mstb->port_parent = port; |
| 2145 | |
| 2146 | /* |
| 2147 | * Make sure this port's memory allocation stays |
| 2148 | * around until its child MSTB releases it |
| 2149 | */ |
| 2150 | drm_dp_mst_get_port_malloc(port); |
| 2151 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 2152 | |
| 2153 | /* And make sure we send a link address for this */ |
| 2154 | ret = 1; |
| 2155 | } |
| 2156 | } |
| 2157 | |
| 2158 | out: |
| 2159 | if (ret < 0) |
| 2160 | port->pdt = DP_PEER_DEVICE_NONE0x0; |
| 2161 | return ret; |
| 2162 | } |
| 2163 | |
| 2164 | /** |
| 2165 | * drm_dp_mst_dpcd_read() - read a series of bytes from the DPCD via sideband |
| 2166 | * @aux: Fake sideband AUX CH |
| 2167 | * @offset: address of the (first) register to read |
| 2168 | * @buffer: buffer to store the register values |
| 2169 | * @size: number of bytes in @buffer |
| 2170 | * |
| 2171 | * Performs the same functionality for remote devices via |
| 2172 | * sideband messaging as drm_dp_dpcd_read() does for local |
| 2173 | * devices via actual AUX CH. |
| 2174 | * |
| 2175 | * Return: Number of bytes read, or negative error code on failure. |
| 2176 | */ |
| 2177 | ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux, |
| 2178 | unsigned int offset, void *buffer, size_t size) |
| 2179 | { |
| 2180 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port,({ const __typeof( ((struct drm_dp_mst_port *)0)->aux ) *__mptr = (aux); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof (struct drm_dp_mst_port, aux) );}) |
| 2181 | aux)({ const __typeof( ((struct drm_dp_mst_port *)0)->aux ) *__mptr = (aux); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof (struct drm_dp_mst_port, aux) );}); |
| 2182 | |
| 2183 | return drm_dp_send_dpcd_read(port->mgr, port, |
| 2184 | offset, size, buffer); |
| 2185 | } |
| 2186 | |
| 2187 | /** |
| 2188 | * drm_dp_mst_dpcd_write() - write a series of bytes to the DPCD via sideband |
| 2189 | * @aux: Fake sideband AUX CH |
| 2190 | * @offset: address of the (first) register to write |
| 2191 | * @buffer: buffer containing the values to write |
| 2192 | * @size: number of bytes in @buffer |
| 2193 | * |
| 2194 | * Performs the same functionality for remote devices via |
| 2195 | * sideband messaging as drm_dp_dpcd_write() does for local |
| 2196 | * devices via actual AUX CH. |
| 2197 | * |
| 2198 | * Return: number of bytes written on success, negative error code on failure. |
| 2199 | */ |
| 2200 | ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux, |
| 2201 | unsigned int offset, void *buffer, size_t size) |
| 2202 | { |
| 2203 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port,({ const __typeof( ((struct drm_dp_mst_port *)0)->aux ) *__mptr = (aux); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof (struct drm_dp_mst_port, aux) );}) |
| 2204 | aux)({ const __typeof( ((struct drm_dp_mst_port *)0)->aux ) *__mptr = (aux); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof (struct drm_dp_mst_port, aux) );}); |
| 2205 | |
| 2206 | return drm_dp_send_dpcd_write(port->mgr, port, |
| 2207 | offset, size, buffer); |
| 2208 | } |
| 2209 | |
| 2210 | static int drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) |
| 2211 | { |
| 2212 | int ret = 0; |
| 2213 | |
| 2214 | memcpy(mstb->guid, guid, 16)__builtin_memcpy((mstb->guid), (guid), (16)); |
| 2215 | |
| 2216 | if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { |
| 2217 | if (mstb->port_parent) { |
| 2218 | ret = drm_dp_send_dpcd_write(mstb->mgr, |
| 2219 | mstb->port_parent, |
| 2220 | DP_GUID0x030, 16, mstb->guid); |
| 2221 | } else { |
| 2222 | ret = drm_dp_dpcd_write(mstb->mgr->aux, |
| 2223 | DP_GUID0x030, mstb->guid, 16); |
| 2224 | } |
| 2225 | } |
| 2226 | |
| 2227 | if (ret < 16 && ret > 0) |
| 2228 | return -EPROTO95; |
| 2229 | |
| 2230 | return ret == 16 ? 0 : ret; |
| 2231 | } |
| 2232 | |
| 2233 | static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, |
| 2234 | int pnum, |
| 2235 | char *proppath, |
| 2236 | size_t proppath_size) |
| 2237 | { |
| 2238 | int i; |
| 2239 | char temp[8]; |
| 2240 | |
| 2241 | snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); |
| 2242 | for (i = 0; i < (mstb->lct - 1); i++) { |
| 2243 | int shift = (i % 2) ? 0 : 4; |
| 2244 | int port_num = (mstb->rad[i / 2] >> shift) & 0xf; |
| 2245 | |
| 2246 | snprintf(temp, sizeof(temp), "-%d", port_num); |
| 2247 | strlcat(proppath, temp, proppath_size); |
| 2248 | } |
| 2249 | snprintf(temp, sizeof(temp), "-%d", pnum); |
| 2250 | strlcat(proppath, temp, proppath_size); |
| 2251 | } |
| 2252 | |
| 2253 | /** |
| 2254 | * drm_dp_mst_connector_late_register() - Late MST connector registration |
| 2255 | * @connector: The MST connector |
| 2256 | * @port: The MST port for this connector |
| 2257 | * |
| 2258 | * Helper to register the remote aux device for this MST port. Drivers should |
| 2259 | * call this from their mst connector's late_register hook to enable MST aux |
| 2260 | * devices. |
| 2261 | * |
| 2262 | * Return: 0 on success, negative error code on failure. |
| 2263 | */ |
| 2264 | int drm_dp_mst_connector_late_register(struct drm_connector *connector, |
| 2265 | struct drm_dp_mst_port *port) |
| 2266 | { |
| 2267 | #ifdef __linux__ |
| 2268 | DRM_DEBUG_KMS("registering %s remote bus for %s\n",__drm_dbg(DRM_UT_KMS, "registering %s remote bus for %s\n", port ->aux.name, connector->kdev->kobj.name) |
| 2269 | port->aux.name, connector->kdev->kobj.name)__drm_dbg(DRM_UT_KMS, "registering %s remote bus for %s\n", port ->aux.name, connector->kdev->kobj.name); |
| 2270 | #else |
| 2271 | DRM_DEBUG_KMS("registering %s remote bus\n",__drm_dbg(DRM_UT_KMS, "registering %s remote bus\n", port-> aux.name) |
| 2272 | port->aux.name)__drm_dbg(DRM_UT_KMS, "registering %s remote bus\n", port-> aux.name); |
| 2273 | #endif |
| 2274 | |
| 2275 | port->aux.dev = connector->kdev; |
| 2276 | return drm_dp_aux_register_devnode(&port->aux); |
| 2277 | } |
| 2278 | EXPORT_SYMBOL(drm_dp_mst_connector_late_register); |
| 2279 | |
| 2280 | /** |
| 2281 | * drm_dp_mst_connector_early_unregister() - Early MST connector unregistration |
| 2282 | * @connector: The MST connector |
| 2283 | * @port: The MST port for this connector |
| 2284 | * |
| 2285 | * Helper to unregister the remote aux device for this MST port, registered by |
| 2286 | * drm_dp_mst_connector_late_register(). Drivers should call this from their mst |
| 2287 | * connector's early_unregister hook. |
| 2288 | */ |
| 2289 | void drm_dp_mst_connector_early_unregister(struct drm_connector *connector, |
| 2290 | struct drm_dp_mst_port *port) |
| 2291 | { |
| 2292 | #ifdef __linux__ |
| 2293 | DRM_DEBUG_KMS("unregistering %s remote bus for %s\n",__drm_dbg(DRM_UT_KMS, "unregistering %s remote bus for %s\n", port->aux.name, connector->kdev->kobj.name) |
| 2294 | port->aux.name, connector->kdev->kobj.name)__drm_dbg(DRM_UT_KMS, "unregistering %s remote bus for %s\n", port->aux.name, connector->kdev->kobj.name); |
| 2295 | #else |
| 2296 | DRM_DEBUG_KMS("unregistering %s remote bus\n",__drm_dbg(DRM_UT_KMS, "unregistering %s remote bus\n", port-> aux.name) |
| 2297 | port->aux.name)__drm_dbg(DRM_UT_KMS, "unregistering %s remote bus\n", port-> aux.name); |
| 2298 | #endif |
| 2299 | drm_dp_aux_unregister_devnode(&port->aux); |
| 2300 | } |
| 2301 | EXPORT_SYMBOL(drm_dp_mst_connector_early_unregister); |
| 2302 | |
| 2303 | static void |
| 2304 | drm_dp_mst_port_add_connector(struct drm_dp_mst_branch *mstb, |
| 2305 | struct drm_dp_mst_port *port) |
| 2306 | { |
| 2307 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
| 2308 | char proppath[255]; |
| 2309 | int ret; |
| 2310 | |
| 2311 | build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath)); |
| 2312 | port->connector = mgr->cbs->add_connector(mgr, port, proppath); |
| 2313 | if (!port->connector) { |
| 2314 | ret = -ENOMEM12; |
| 2315 | goto error; |
| 2316 | } |
| 2317 | |
| 2318 | if (port->pdt != DP_PEER_DEVICE_NONE0x0 && |
| 2319 | drm_dp_mst_is_end_device(port->pdt, port->mcs) && |
| 2320 | port->port_num >= DP_MST_LOGICAL_PORT_08) { |
| 2321 | port->cached_edid = drm_get_edid(port->connector, |
| 2322 | &port->aux.ddc); |
| 2323 | drm_connector_set_tile_property(port->connector); |
| 2324 | } |
| 2325 | |
| 2326 | drm_connector_register(port->connector); |
| 2327 | return; |
| 2328 | |
| 2329 | error: |
| 2330 | DRM_ERROR("Failed to create connector for port %p: %d\n", port, ret)__drm_err("Failed to create connector for port %p: %d\n", port , ret); |
| 2331 | } |
| 2332 | |
| 2333 | /* |
| 2334 | * Drop a topology reference, and unlink the port from the in-memory topology |
| 2335 | * layout |
| 2336 | */ |
| 2337 | static void |
| 2338 | drm_dp_mst_topology_unlink_port(struct drm_dp_mst_topology_mgr *mgr, |
| 2339 | struct drm_dp_mst_port *port) |
| 2340 | { |
| 2341 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 2342 | port->parent->num_ports--; |
| 2343 | list_del(&port->next); |
| 2344 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 2345 | drm_dp_mst_topology_put_port(port); |
| 2346 | } |
| 2347 | |
| 2348 | static struct drm_dp_mst_port * |
| 2349 | drm_dp_mst_add_port(struct drm_device *dev, |
| 2350 | struct drm_dp_mst_topology_mgr *mgr, |
| 2351 | struct drm_dp_mst_branch *mstb, u8 port_number) |
| 2352 | { |
| 2353 | struct drm_dp_mst_port *port = kzalloc(sizeof(*port), GFP_KERNEL(0x0001 | 0x0004)); |
| 2354 | |
| 2355 | if (!port) |
| 2356 | return NULL((void *)0); |
| 2357 | |
| 2358 | kref_init(&port->topology_kref); |
| 2359 | kref_init(&port->malloc_kref); |
| 2360 | port->parent = mstb; |
| 2361 | port->port_num = port_number; |
| 2362 | port->mgr = mgr; |
| 2363 | port->aux.name = "DPMST"; |
| 2364 | port->aux.dev = dev->dev; |
| 2365 | port->aux.is_remote = true1; |
| 2366 | |
| 2367 | /* initialize the MST downstream port's AUX crc work queue */ |
| 2368 | drm_dp_remote_aux_init(&port->aux); |
| 2369 | |
| 2370 | /* |
| 2371 | * Make sure the memory allocation for our parent branch stays |
| 2372 | * around until our own memory allocation is released |
| 2373 | */ |
| 2374 | drm_dp_mst_get_mstb_malloc(mstb); |
| 2375 | |
| 2376 | return port; |
| 2377 | } |
| 2378 | |
| 2379 | static int |
| 2380 | drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb, |
| 2381 | struct drm_device *dev, |
| 2382 | struct drm_dp_link_addr_reply_port *port_msg) |
| 2383 | { |
| 2384 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
| 2385 | struct drm_dp_mst_port *port; |
| 2386 | int old_ddps = 0, ret; |
| 2387 | u8 new_pdt = DP_PEER_DEVICE_NONE0x0; |
| 2388 | bool_Bool new_mcs = 0; |
| 2389 | bool_Bool created = false0, send_link_addr = false0, changed = false0; |
| 2390 | |
| 2391 | port = drm_dp_get_port(mstb, port_msg->port_number); |
| 2392 | if (!port) { |
| 2393 | port = drm_dp_mst_add_port(dev, mgr, mstb, |
| 2394 | port_msg->port_number); |
| 2395 | if (!port) |
| 2396 | return -ENOMEM12; |
| 2397 | created = true1; |
| 2398 | changed = true1; |
| 2399 | } else if (!port->input && port_msg->input_port && port->connector) { |
| 2400 | /* Since port->connector can't be changed here, we create a |
| 2401 | * new port if input_port changes from 0 to 1 |
| 2402 | */ |
| 2403 | drm_dp_mst_topology_unlink_port(mgr, port); |
| 2404 | drm_dp_mst_topology_put_port(port); |
| 2405 | port = drm_dp_mst_add_port(dev, mgr, mstb, |
| 2406 | port_msg->port_number); |
| 2407 | if (!port) |
| 2408 | return -ENOMEM12; |
| 2409 | changed = true1; |
| 2410 | created = true1; |
| 2411 | } else if (port->input && !port_msg->input_port) { |
| 2412 | changed = true1; |
| 2413 | } else if (port->connector) { |
| 2414 | /* We're updating a port that's exposed to userspace, so do it |
| 2415 | * under lock |
| 2416 | */ |
| 2417 | drm_modeset_lock(&mgr->base.lock, NULL((void *)0)); |
| 2418 | |
| 2419 | old_ddps = port->ddps; |
| 2420 | changed = port->ddps != port_msg->ddps || |
| 2421 | (port->ddps && |
| 2422 | (port->ldps != port_msg->legacy_device_plug_status || |
| 2423 | port->dpcd_rev != port_msg->dpcd_revision || |
| 2424 | port->mcs != port_msg->mcs || |
| 2425 | port->pdt != port_msg->peer_device_type || |
| 2426 | port->num_sdp_stream_sinks != |
| 2427 | port_msg->num_sdp_stream_sinks)); |
| 2428 | } |
| 2429 | |
| 2430 | port->input = port_msg->input_port; |
| 2431 | if (!port->input) |
| 2432 | new_pdt = port_msg->peer_device_type; |
| 2433 | new_mcs = port_msg->mcs; |
| 2434 | port->ddps = port_msg->ddps; |
| 2435 | port->ldps = port_msg->legacy_device_plug_status; |
| 2436 | port->dpcd_rev = port_msg->dpcd_revision; |
| 2437 | port->num_sdp_streams = port_msg->num_sdp_streams; |
| 2438 | port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; |
| 2439 | |
| 2440 | /* manage mstb port lists with mgr lock - take a reference |
| 2441 | for this list */ |
| 2442 | if (created) { |
| 2443 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 2444 | drm_dp_mst_topology_get_port(port); |
| 2445 | list_add(&port->next, &mstb->ports); |
| 2446 | mstb->num_ports++; |
| 2447 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 2448 | } |
| 2449 | |
| 2450 | /* |
| 2451 | * Reprobe PBN caps on both hotplug, and when re-probing the link |
| 2452 | * for our parent mstb |
| 2453 | */ |
| 2454 | if (old_ddps != port->ddps || !created) { |
| 2455 | if (port->ddps && !port->input) { |
| 2456 | ret = drm_dp_send_enum_path_resources(mgr, mstb, |
| 2457 | port); |
| 2458 | if (ret == 1) |
| 2459 | changed = true1; |
| 2460 | } else { |
| 2461 | port->full_pbn = 0; |
| 2462 | } |
| 2463 | } |
| 2464 | |
| 2465 | ret = drm_dp_port_set_pdt(port, new_pdt, new_mcs); |
| 2466 | if (ret == 1) { |
| 2467 | send_link_addr = true1; |
| 2468 | } else if (ret < 0) { |
| 2469 | DRM_ERROR("Failed to change PDT on port %p: %d\n",__drm_err("Failed to change PDT on port %p: %d\n", port, ret) |
| 2470 | port, ret)__drm_err("Failed to change PDT on port %p: %d\n", port, ret); |
| 2471 | goto fail; |
| 2472 | } |
| 2473 | |
| 2474 | /* |
| 2475 | * If this port wasn't just created, then we're reprobing because |
| 2476 | * we're coming out of suspend. In this case, always resend the link |
| 2477 | * address if there's an MSTB on this port |
| 2478 | */ |
| 2479 | if (!created && port->pdt == DP_PEER_DEVICE_MST_BRANCHING0x2 && |
| 2480 | port->mcs) |
| 2481 | send_link_addr = true1; |
| 2482 | |
| 2483 | if (port->connector) |
| 2484 | drm_modeset_unlock(&mgr->base.lock); |
| 2485 | else if (!port->input) |
| 2486 | drm_dp_mst_port_add_connector(mstb, port); |
| 2487 | |
| 2488 | if (send_link_addr && port->mstb) { |
| 2489 | ret = drm_dp_send_link_address(mgr, port->mstb); |
| 2490 | if (ret == 1) /* MSTB below us changed */ |
| 2491 | changed = true1; |
| 2492 | else if (ret < 0) |
| 2493 | goto fail_put; |
| 2494 | } |
| 2495 | |
| 2496 | /* put reference to this port */ |
| 2497 | drm_dp_mst_topology_put_port(port); |
| 2498 | return changed; |
| 2499 | |
| 2500 | fail: |
| 2501 | drm_dp_mst_topology_unlink_port(mgr, port); |
| 2502 | if (port->connector) |
| 2503 | drm_modeset_unlock(&mgr->base.lock); |
| 2504 | fail_put: |
| 2505 | drm_dp_mst_topology_put_port(port); |
| 2506 | return ret; |
| 2507 | } |
| 2508 | |
| 2509 | static void |
| 2510 | drm_dp_mst_handle_conn_stat(struct drm_dp_mst_branch *mstb, |
| 2511 | struct drm_dp_connection_status_notify *conn_stat) |
| 2512 | { |
| 2513 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
| 2514 | struct drm_dp_mst_port *port; |
| 2515 | int old_ddps, ret; |
| 2516 | u8 new_pdt; |
| 2517 | bool_Bool new_mcs; |
| 2518 | bool_Bool dowork = false0, create_connector = false0; |
| 2519 | |
| 2520 | port = drm_dp_get_port(mstb, conn_stat->port_number); |
| 2521 | if (!port) |
| 2522 | return; |
| 2523 | |
| 2524 | if (port->connector) { |
| 2525 | if (!port->input && conn_stat->input_port) { |
| 2526 | /* |
| 2527 | * We can't remove a connector from an already exposed |
| 2528 | * port, so just throw the port out and make sure we |
| 2529 | * reprobe the link address of it's parent MSTB |
| 2530 | */ |
| 2531 | drm_dp_mst_topology_unlink_port(mgr, port); |
| 2532 | mstb->link_address_sent = false0; |
| 2533 | dowork = true1; |
| 2534 | goto out; |
| 2535 | } |
| 2536 | |
| 2537 | /* Locking is only needed if the port's exposed to userspace */ |
| 2538 | drm_modeset_lock(&mgr->base.lock, NULL((void *)0)); |
| 2539 | } else if (port->input && !conn_stat->input_port) { |
| 2540 | create_connector = true1; |
| 2541 | /* Reprobe link address so we get num_sdp_streams */ |
| 2542 | mstb->link_address_sent = false0; |
| 2543 | dowork = true1; |
| 2544 | } |
| 2545 | |
| 2546 | old_ddps = port->ddps; |
| 2547 | port->input = conn_stat->input_port; |
| 2548 | port->ldps = conn_stat->legacy_device_plug_status; |
| 2549 | port->ddps = conn_stat->displayport_device_plug_status; |
| 2550 | |
| 2551 | if (old_ddps != port->ddps) { |
| 2552 | if (port->ddps && !port->input) |
| 2553 | drm_dp_send_enum_path_resources(mgr, mstb, port); |
| 2554 | else |
| 2555 | port->full_pbn = 0; |
| 2556 | } |
| 2557 | |
| 2558 | new_pdt = port->input ? DP_PEER_DEVICE_NONE0x0 : conn_stat->peer_device_type; |
| 2559 | new_mcs = conn_stat->message_capability_status; |
| 2560 | ret = drm_dp_port_set_pdt(port, new_pdt, new_mcs); |
| 2561 | if (ret == 1) { |
| 2562 | dowork = true1; |
| 2563 | } else if (ret < 0) { |
| 2564 | DRM_ERROR("Failed to change PDT for port %p: %d\n",__drm_err("Failed to change PDT for port %p: %d\n", port, ret ) |
| 2565 | port, ret)__drm_err("Failed to change PDT for port %p: %d\n", port, ret ); |
| 2566 | dowork = false0; |
| 2567 | } |
| 2568 | |
| 2569 | if (port->connector) |
| 2570 | drm_modeset_unlock(&mgr->base.lock); |
| 2571 | else if (create_connector) |
| 2572 | drm_dp_mst_port_add_connector(mstb, port); |
| 2573 | |
| 2574 | out: |
| 2575 | drm_dp_mst_topology_put_port(port); |
| 2576 | if (dowork) |
| 2577 | queue_work(system_long_wq, &mstb->mgr->work); |
| 2578 | } |
| 2579 | |
| 2580 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, |
| 2581 | u8 lct, u8 *rad) |
| 2582 | { |
| 2583 | struct drm_dp_mst_branch *mstb; |
| 2584 | struct drm_dp_mst_port *port; |
| 2585 | int i, ret; |
| 2586 | /* find the port by iterating down */ |
| 2587 | |
| 2588 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 2589 | mstb = mgr->mst_primary; |
| 2590 | |
| 2591 | if (!mstb) |
| 2592 | goto out; |
| 2593 | |
| 2594 | for (i = 0; i < lct - 1; i++) { |
| 2595 | int shift = (i % 2) ? 0 : 4; |
| 2596 | int port_num = (rad[i / 2] >> shift) & 0xf; |
| 2597 | |
| 2598 | list_for_each_entry(port, &mstb->ports, next)for (port = ({ const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = ((&mstb->ports)->next); (__typeof(*port ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*port), next ) );}); &port->next != (&mstb->ports); port = ( { const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = (port->next.next); (__typeof(*port) *)( (char *)__mptr - __builtin_offsetof (__typeof(*port), next) );})) { |
| 2599 | if (port->port_num == port_num) { |
| 2600 | mstb = port->mstb; |
| 2601 | if (!mstb) { |
| 2602 | DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0])__drm_err("failed to lookup MSTB with lct %d, rad %02x\n", lct , rad[0]); |
| 2603 | goto out; |
| 2604 | } |
| 2605 | |
| 2606 | break; |
| 2607 | } |
| 2608 | } |
| 2609 | } |
| 2610 | ret = drm_dp_mst_topology_try_get_mstb(mstb); |
| 2611 | if (!ret) |
| 2612 | mstb = NULL((void *)0); |
| 2613 | out: |
| 2614 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 2615 | return mstb; |
| 2616 | } |
| 2617 | |
| 2618 | static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( |
| 2619 | struct drm_dp_mst_branch *mstb, |
| 2620 | const uint8_t *guid) |
| 2621 | { |
| 2622 | struct drm_dp_mst_branch *found_mstb; |
| 2623 | struct drm_dp_mst_port *port; |
| 2624 | |
| 2625 | if (memcmp(mstb->guid, guid, 16)__builtin_memcmp((mstb->guid), (guid), (16)) == 0) |
| 2626 | return mstb; |
| 2627 | |
| 2628 | |
| 2629 | list_for_each_entry(port, &mstb->ports, next)for (port = ({ const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = ((&mstb->ports)->next); (__typeof(*port ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*port), next ) );}); &port->next != (&mstb->ports); port = ( { const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = (port->next.next); (__typeof(*port) *)( (char *)__mptr - __builtin_offsetof (__typeof(*port), next) );})) { |
| 2630 | if (!port->mstb) |
| 2631 | continue; |
| 2632 | |
| 2633 | found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); |
| 2634 | |
| 2635 | if (found_mstb) |
| 2636 | return found_mstb; |
| 2637 | } |
| 2638 | |
| 2639 | return NULL((void *)0); |
| 2640 | } |
| 2641 | |
| 2642 | static struct drm_dp_mst_branch * |
| 2643 | drm_dp_get_mst_branch_device_by_guid(struct drm_dp_mst_topology_mgr *mgr, |
| 2644 | const uint8_t *guid) |
| 2645 | { |
| 2646 | struct drm_dp_mst_branch *mstb; |
| 2647 | int ret; |
| 2648 | |
| 2649 | /* find the port by iterating down */ |
| 2650 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 2651 | |
| 2652 | mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); |
| 2653 | if (mstb) { |
| 2654 | ret = drm_dp_mst_topology_try_get_mstb(mstb); |
| 2655 | if (!ret) |
| 2656 | mstb = NULL((void *)0); |
| 2657 | } |
| 2658 | |
| 2659 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 2660 | return mstb; |
| 2661 | } |
| 2662 | |
| 2663 | static int drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
| 2664 | struct drm_dp_mst_branch *mstb) |
| 2665 | { |
| 2666 | struct drm_dp_mst_port *port; |
| 2667 | int ret; |
| 2668 | bool_Bool changed = false0; |
| 2669 | |
| 2670 | if (!mstb->link_address_sent) { |
| 2671 | ret = drm_dp_send_link_address(mgr, mstb); |
| 2672 | if (ret == 1) |
| 2673 | changed = true1; |
| 2674 | else if (ret < 0) |
| 2675 | return ret; |
| 2676 | } |
| 2677 | |
| 2678 | list_for_each_entry(port, &mstb->ports, next)for (port = ({ const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = ((&mstb->ports)->next); (__typeof(*port ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*port), next ) );}); &port->next != (&mstb->ports); port = ( { const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = (port->next.next); (__typeof(*port) *)( (char *)__mptr - __builtin_offsetof (__typeof(*port), next) );})) { |
| 2679 | struct drm_dp_mst_branch *mstb_child = NULL((void *)0); |
| 2680 | |
| 2681 | if (port->input || !port->ddps) |
| 2682 | continue; |
| 2683 | |
| 2684 | if (port->mstb) |
| 2685 | mstb_child = drm_dp_mst_topology_get_mstb_validated( |
| 2686 | mgr, port->mstb); |
| 2687 | |
| 2688 | if (mstb_child) { |
| 2689 | ret = drm_dp_check_and_send_link_address(mgr, |
| 2690 | mstb_child); |
| 2691 | drm_dp_mst_topology_put_mstb(mstb_child); |
| 2692 | if (ret == 1) |
| 2693 | changed = true1; |
| 2694 | else if (ret < 0) |
| 2695 | return ret; |
| 2696 | } |
| 2697 | } |
| 2698 | |
| 2699 | return changed; |
| 2700 | } |
| 2701 | |
| 2702 | static void drm_dp_mst_link_probe_work(struct work_struct *work) |
| 2703 | { |
| 2704 | struct drm_dp_mst_topology_mgr *mgr = |
| 2705 | container_of(work, struct drm_dp_mst_topology_mgr, work)({ const __typeof( ((struct drm_dp_mst_topology_mgr *)0)-> work ) *__mptr = (work); (struct drm_dp_mst_topology_mgr *)( ( char *)__mptr - __builtin_offsetof(struct drm_dp_mst_topology_mgr , work) );}); |
| 2706 | struct drm_device *dev = mgr->dev; |
| 2707 | struct drm_dp_mst_branch *mstb; |
| 2708 | int ret; |
| 2709 | bool_Bool clear_payload_id_table; |
| 2710 | |
| 2711 | mutex_lock(&mgr->probe_lock)rw_enter_write(&mgr->probe_lock); |
| 2712 | |
| 2713 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 2714 | clear_payload_id_table = !mgr->payload_id_table_cleared; |
| 2715 | mgr->payload_id_table_cleared = true1; |
| 2716 | |
| 2717 | mstb = mgr->mst_primary; |
| 2718 | if (mstb) { |
| 2719 | ret = drm_dp_mst_topology_try_get_mstb(mstb); |
| 2720 | if (!ret) |
| 2721 | mstb = NULL((void *)0); |
| 2722 | } |
| 2723 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 2724 | if (!mstb) { |
| 2725 | mutex_unlock(&mgr->probe_lock)rw_exit_write(&mgr->probe_lock); |
| 2726 | return; |
| 2727 | } |
| 2728 | |
| 2729 | /* |
| 2730 | * Certain branch devices seem to incorrectly report an available_pbn |
| 2731 | * of 0 on downstream sinks, even after clearing the |
| 2732 | * DP_PAYLOAD_ALLOCATE_* registers in |
| 2733 | * drm_dp_mst_topology_mgr_set_mst(). Namely, the CableMatters USB-C |
| 2734 | * 2x DP hub. Sending a CLEAR_PAYLOAD_ID_TABLE message seems to make |
| 2735 | * things work again. |
| 2736 | */ |
| 2737 | if (clear_payload_id_table) { |
| 2738 | DRM_DEBUG_KMS("Clearing payload ID table\n")__drm_dbg(DRM_UT_KMS, "Clearing payload ID table\n"); |
| 2739 | drm_dp_send_clear_payload_id_table(mgr, mstb); |
| 2740 | } |
| 2741 | |
| 2742 | ret = drm_dp_check_and_send_link_address(mgr, mstb); |
| 2743 | drm_dp_mst_topology_put_mstb(mstb); |
| 2744 | |
| 2745 | mutex_unlock(&mgr->probe_lock)rw_exit_write(&mgr->probe_lock); |
| 2746 | if (ret) |
| 2747 | drm_kms_helper_hotplug_event(dev); |
| 2748 | } |
| 2749 | |
| 2750 | static bool_Bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, |
| 2751 | u8 *guid) |
| 2752 | { |
| 2753 | u64 salt; |
| 2754 | |
| 2755 | if (memchr_inv(guid, 0, 16)) |
| 2756 | return true1; |
| 2757 | |
| 2758 | salt = get_jiffies_64()jiffies; |
| 2759 | |
| 2760 | memcpy(&guid[0], &salt, sizeof(u64))__builtin_memcpy((&guid[0]), (&salt), (sizeof(u64))); |
| 2761 | memcpy(&guid[8], &salt, sizeof(u64))__builtin_memcpy((&guid[8]), (&salt), (sizeof(u64))); |
| 2762 | |
| 2763 | return false0; |
| 2764 | } |
| 2765 | |
| 2766 | static void build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, |
| 2767 | u8 port_num, u32 offset, u8 num_bytes) |
| 2768 | { |
| 2769 | struct drm_dp_sideband_msg_req_body req; |
| 2770 | |
| 2771 | req.req_type = DP_REMOTE_DPCD_READ0x20; |
| 2772 | req.u.dpcd_read.port_number = port_num; |
| 2773 | req.u.dpcd_read.dpcd_address = offset; |
| 2774 | req.u.dpcd_read.num_bytes = num_bytes; |
| 2775 | drm_dp_encode_sideband_req(&req, msg); |
| 2776 | } |
| 2777 | |
| 2778 | static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, |
| 2779 | bool_Bool up, u8 *msg, int len) |
| 2780 | { |
| 2781 | int ret; |
| 2782 | int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE0x1200 : DP_SIDEBAND_MSG_DOWN_REQ_BASE0x1000; |
| 2783 | int tosend, total, offset; |
| 2784 | int retries = 0; |
| 2785 | |
| 2786 | retry: |
| 2787 | total = len; |
| 2788 | offset = 0; |
| 2789 | do { |
| 2790 | tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total)(((mgr->max_dpcd_transaction_bytes)<((((16)<(total)) ?(16):(total))))?(mgr->max_dpcd_transaction_bytes):((((16) <(total))?(16):(total)))); |
| 2791 | |
| 2792 | ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, |
| 2793 | &msg[offset], |
| 2794 | tosend); |
| 2795 | if (ret != tosend) { |
| 2796 | if (ret == -EIO5 && retries < 5) { |
| 2797 | retries++; |
| 2798 | goto retry; |
| 2799 | } |
| 2800 | DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret)__drm_dbg(DRM_UT_KMS, "failed to dpcd write %d %d\n", tosend, ret); |
| 2801 | |
| 2802 | return -EIO5; |
| 2803 | } |
| 2804 | offset += tosend; |
| 2805 | total -= tosend; |
| 2806 | } while (total > 0); |
| 2807 | return 0; |
| 2808 | } |
| 2809 | |
| 2810 | static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, |
| 2811 | struct drm_dp_sideband_msg_tx *txmsg) |
| 2812 | { |
| 2813 | struct drm_dp_mst_branch *mstb = txmsg->dst; |
| 2814 | u8 req_type; |
| 2815 | |
| 2816 | req_type = txmsg->msg[0] & 0x7f; |
| 2817 | if (req_type == DP_CONNECTION_STATUS_NOTIFY0x02 || |
| 2818 | req_type == DP_RESOURCE_STATUS_NOTIFY0x13 || |
| 2819 | req_type == DP_CLEAR_PAYLOAD_ID_TABLE0x14) |
| 2820 | hdr->broadcast = 1; |
| 2821 | else |
| 2822 | hdr->broadcast = 0; |
| 2823 | hdr->path_msg = txmsg->path_msg; |
| 2824 | if (hdr->broadcast) { |
| 2825 | hdr->lct = 1; |
| 2826 | hdr->lcr = 6; |
| 2827 | } else { |
| 2828 | hdr->lct = mstb->lct; |
| 2829 | hdr->lcr = mstb->lct - 1; |
| 2830 | } |
| 2831 | |
| 2832 | memcpy(hdr->rad, mstb->rad, hdr->lct / 2)__builtin_memcpy((hdr->rad), (mstb->rad), (hdr->lct / 2)); |
| 2833 | |
| 2834 | return 0; |
| 2835 | } |
| 2836 | /* |
| 2837 | * process a single block of the next message in the sideband queue |
| 2838 | */ |
| 2839 | static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, |
| 2840 | struct drm_dp_sideband_msg_tx *txmsg, |
| 2841 | bool_Bool up) |
| 2842 | { |
| 2843 | u8 chunk[48]; |
| 2844 | struct drm_dp_sideband_msg_hdr hdr; |
| 2845 | int len, space, idx, tosend; |
| 2846 | int ret; |
| 2847 | |
| 2848 | if (txmsg->state == DRM_DP_SIDEBAND_TX_SENT2) |
| 2849 | return 0; |
| 2850 | |
| 2851 | memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr))__builtin_memset((&hdr), (0), (sizeof(struct drm_dp_sideband_msg_hdr ))); |
| 2852 | |
| 2853 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED0) |
| 2854 | txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND1; |
| 2855 | |
| 2856 | /* make hdr from dst mst */ |
| 2857 | ret = set_hdr_from_dst_qlock(&hdr, txmsg); |
| 2858 | if (ret < 0) |
| 2859 | return ret; |
| 2860 | |
| 2861 | /* amount left to send in this message */ |
| 2862 | len = txmsg->cur_len - txmsg->cur_offset; |
| 2863 | |
| 2864 | /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ |
| 2865 | space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); |
| 2866 | |
| 2867 | tosend = min(len, space)(((len)<(space))?(len):(space)); |
| 2868 | if (len == txmsg->cur_len) |
| 2869 | hdr.somt = 1; |
| 2870 | if (space >= len) |
| 2871 | hdr.eomt = 1; |
| 2872 | |
| 2873 | |
| 2874 | hdr.msg_len = tosend + 1; |
| 2875 | drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); |
| 2876 | memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend)__builtin_memcpy((&chunk[idx]), (&txmsg->msg[txmsg ->cur_offset]), (tosend)); |
| 2877 | /* add crc at end */ |
| 2878 | drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); |
| 2879 | idx += tosend + 1; |
| 2880 | |
| 2881 | ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); |
| 2882 | if (ret) { |
| 2883 | if (drm_debug_enabled(DRM_UT_DP)) { |
| 2884 | struct drm_printer p = drm_debug_printer(DBG_PREFIX"[dp_mst]"); |
| 2885 | |
| 2886 | drm_printf(&p, "sideband msg failed to send\n"); |
| 2887 | drm_dp_mst_dump_sideband_msg_tx(&p, txmsg); |
| 2888 | } |
| 2889 | return ret; |
| 2890 | } |
| 2891 | |
| 2892 | txmsg->cur_offset += tosend; |
| 2893 | if (txmsg->cur_offset == txmsg->cur_len) { |
| 2894 | txmsg->state = DRM_DP_SIDEBAND_TX_SENT2; |
| 2895 | return 1; |
| 2896 | } |
| 2897 | return 0; |
| 2898 | } |
| 2899 | |
| 2900 | static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) |
| 2901 | { |
| 2902 | struct drm_dp_sideband_msg_tx *txmsg; |
| 2903 | int ret; |
| 2904 | |
| 2905 | WARN_ON(!mutex_is_locked(&mgr->qlock))({ int __ret = !!(!(rw_status(&mgr->qlock) != 0)); if ( __ret) printf("WARNING %s failed at %s:%d\n", "!(rw_status(&mgr->qlock) != 0)" , "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c", 2905); __builtin_expect (!!(__ret), 0); }); |
| 2906 | |
| 2907 | /* construct a chunk from the first msg in the tx_msg queue */ |
| 2908 | if (list_empty(&mgr->tx_msg_downq)) |
| 2909 | return; |
| 2910 | |
| 2911 | txmsg = list_first_entry(&mgr->tx_msg_downq,({ const __typeof( ((struct drm_dp_sideband_msg_tx *)0)->next ) *__mptr = ((&mgr->tx_msg_downq)->next); (struct drm_dp_sideband_msg_tx *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_sideband_msg_tx , next) );}) |
| 2912 | struct drm_dp_sideband_msg_tx, next)({ const __typeof( ((struct drm_dp_sideband_msg_tx *)0)->next ) *__mptr = ((&mgr->tx_msg_downq)->next); (struct drm_dp_sideband_msg_tx *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_sideband_msg_tx , next) );}); |
| 2913 | ret = process_single_tx_qlock(mgr, txmsg, false0); |
| 2914 | if (ret < 0) { |
| 2915 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret)__drm_dbg(DRM_UT_KMS, "failed to send msg in q %d\n", ret); |
| 2916 | list_del(&txmsg->next); |
| 2917 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT4; |
| 2918 | wake_up_all(&mgr->tx_waitq)wake_up(&mgr->tx_waitq); |
| 2919 | } |
| 2920 | } |
| 2921 | |
| 2922 | static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, |
| 2923 | struct drm_dp_sideband_msg_tx *txmsg) |
| 2924 | { |
| 2925 | mutex_lock(&mgr->qlock)rw_enter_write(&mgr->qlock); |
| 2926 | list_add_tail(&txmsg->next, &mgr->tx_msg_downq); |
| 2927 | |
| 2928 | if (drm_debug_enabled(DRM_UT_DP)) { |
| 2929 | struct drm_printer p = drm_debug_printer(DBG_PREFIX"[dp_mst]"); |
| 2930 | |
| 2931 | drm_dp_mst_dump_sideband_msg_tx(&p, txmsg); |
| 2932 | } |
| 2933 | |
| 2934 | if (list_is_singular(&mgr->tx_msg_downq)) |
| 2935 | process_single_down_tx_qlock(mgr); |
| 2936 | mutex_unlock(&mgr->qlock)rw_exit_write(&mgr->qlock); |
| 2937 | } |
| 2938 | |
| 2939 | static void |
| 2940 | drm_dp_dump_link_address(struct drm_dp_link_address_ack_reply *reply) |
| 2941 | { |
| 2942 | struct drm_dp_link_addr_reply_port *port_reply; |
| 2943 | int i; |
| 2944 | |
| 2945 | for (i = 0; i < reply->nports; i++) { |
| 2946 | port_reply = &reply->ports[i]; |
| 2947 | DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n",__drm_dbg(DRM_UT_KMS, "port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n" , i, port_reply->input_port, port_reply->peer_device_type , port_reply->port_number, port_reply->dpcd_revision, port_reply ->mcs, port_reply->ddps, port_reply->legacy_device_plug_status , port_reply->num_sdp_streams, port_reply->num_sdp_stream_sinks ) |
| 2948 | i,__drm_dbg(DRM_UT_KMS, "port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n" , i, port_reply->input_port, port_reply->peer_device_type , port_reply->port_number, port_reply->dpcd_revision, port_reply ->mcs, port_reply->ddps, port_reply->legacy_device_plug_status , port_reply->num_sdp_streams, port_reply->num_sdp_stream_sinks ) |
| 2949 | port_reply->input_port,__drm_dbg(DRM_UT_KMS, "port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n" , i, port_reply->input_port, port_reply->peer_device_type , port_reply->port_number, port_reply->dpcd_revision, port_reply ->mcs, port_reply->ddps, port_reply->legacy_device_plug_status , port_reply->num_sdp_streams, port_reply->num_sdp_stream_sinks ) |
| 2950 | port_reply->peer_device_type,__drm_dbg(DRM_UT_KMS, "port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n" , i, port_reply->input_port, port_reply->peer_device_type , port_reply->port_number, port_reply->dpcd_revision, port_reply ->mcs, port_reply->ddps, port_reply->legacy_device_plug_status , port_reply->num_sdp_streams, port_reply->num_sdp_stream_sinks ) |
| 2951 | port_reply->port_number,__drm_dbg(DRM_UT_KMS, "port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n" , i, port_reply->input_port, port_reply->peer_device_type , port_reply->port_number, port_reply->dpcd_revision, port_reply ->mcs, port_reply->ddps, port_reply->legacy_device_plug_status , port_reply->num_sdp_streams, port_reply->num_sdp_stream_sinks ) |
| 2952 | port_reply->dpcd_revision,__drm_dbg(DRM_UT_KMS, "port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n" , i, port_reply->input_port, port_reply->peer_device_type , port_reply->port_number, port_reply->dpcd_revision, port_reply ->mcs, port_reply->ddps, port_reply->legacy_device_plug_status , port_reply->num_sdp_streams, port_reply->num_sdp_stream_sinks ) |
| 2953 | port_reply->mcs,__drm_dbg(DRM_UT_KMS, "port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n" , i, port_reply->input_port, port_reply->peer_device_type , port_reply->port_number, port_reply->dpcd_revision, port_reply ->mcs, port_reply->ddps, port_reply->legacy_device_plug_status , port_reply->num_sdp_streams, port_reply->num_sdp_stream_sinks ) |
| 2954 | port_reply->ddps,__drm_dbg(DRM_UT_KMS, "port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n" , i, port_reply->input_port, port_reply->peer_device_type , port_reply->port_number, port_reply->dpcd_revision, port_reply ->mcs, port_reply->ddps, port_reply->legacy_device_plug_status , port_reply->num_sdp_streams, port_reply->num_sdp_stream_sinks ) |
| 2955 | port_reply->legacy_device_plug_status,__drm_dbg(DRM_UT_KMS, "port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n" , i, port_reply->input_port, port_reply->peer_device_type , port_reply->port_number, port_reply->dpcd_revision, port_reply ->mcs, port_reply->ddps, port_reply->legacy_device_plug_status , port_reply->num_sdp_streams, port_reply->num_sdp_stream_sinks ) |
| 2956 | port_reply->num_sdp_streams,__drm_dbg(DRM_UT_KMS, "port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n" , i, port_reply->input_port, port_reply->peer_device_type , port_reply->port_number, port_reply->dpcd_revision, port_reply ->mcs, port_reply->ddps, port_reply->legacy_device_plug_status , port_reply->num_sdp_streams, port_reply->num_sdp_stream_sinks ) |
| 2957 | port_reply->num_sdp_stream_sinks)__drm_dbg(DRM_UT_KMS, "port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n" , i, port_reply->input_port, port_reply->peer_device_type , port_reply->port_number, port_reply->dpcd_revision, port_reply ->mcs, port_reply->ddps, port_reply->legacy_device_plug_status , port_reply->num_sdp_streams, port_reply->num_sdp_stream_sinks ); |
| 2958 | } |
| 2959 | } |
| 2960 | |
| 2961 | static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
| 2962 | struct drm_dp_mst_branch *mstb) |
| 2963 | { |
| 2964 | struct drm_dp_sideband_msg_tx *txmsg; |
| 2965 | struct drm_dp_link_address_ack_reply *reply; |
| 2966 | struct drm_dp_mst_port *port, *tmp; |
| 2967 | int i, ret, port_mask = 0; |
| 2968 | bool_Bool changed = false0; |
| 2969 | |
| 2970 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL(0x0001 | 0x0004)); |
| 2971 | if (!txmsg) |
| 2972 | return -ENOMEM12; |
| 2973 | |
| 2974 | txmsg->dst = mstb; |
| 2975 | build_link_address(txmsg); |
| 2976 | |
| 2977 | mstb->link_address_sent = true1; |
| 2978 | drm_dp_queue_down_tx(mgr, txmsg); |
| 2979 | |
| 2980 | /* FIXME: Actually do some real error handling here */ |
| 2981 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 2982 | if (ret <= 0) { |
| 2983 | DRM_ERROR("Sending link address failed with %d\n", ret)__drm_err("Sending link address failed with %d\n", ret); |
| 2984 | goto out; |
| 2985 | } |
| 2986 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK0x01) { |
| 2987 | DRM_ERROR("link address NAK received\n")__drm_err("link address NAK received\n"); |
| 2988 | ret = -EIO5; |
| 2989 | goto out; |
| 2990 | } |
| 2991 | |
| 2992 | reply = &txmsg->reply.u.link_addr; |
| 2993 | DRM_DEBUG_KMS("link address reply: %d\n", reply->nports)__drm_dbg(DRM_UT_KMS, "link address reply: %d\n", reply->nports ); |
| 2994 | drm_dp_dump_link_address(reply); |
| 2995 | |
| 2996 | ret = drm_dp_check_mstb_guid(mstb, reply->guid); |
| 2997 | if (ret) { |
| 2998 | char buf[64]; |
| 2999 | |
| 3000 | drm_dp_mst_rad_to_str(mstb->rad, mstb->lct, buf, sizeof(buf)); |
| 3001 | DRM_ERROR("GUID check on %s failed: %d\n",__drm_err("GUID check on %s failed: %d\n", buf, ret) |
| 3002 | buf, ret)__drm_err("GUID check on %s failed: %d\n", buf, ret); |
| 3003 | goto out; |
| 3004 | } |
| 3005 | |
| 3006 | for (i = 0; i < reply->nports; i++) { |
| 3007 | port_mask |= BIT(reply->ports[i].port_number)(1UL << (reply->ports[i].port_number)); |
| 3008 | ret = drm_dp_mst_handle_link_address_port(mstb, mgr->dev, |
| 3009 | &reply->ports[i]); |
| 3010 | if (ret == 1) |
| 3011 | changed = true1; |
| 3012 | else if (ret < 0) |
| 3013 | goto out; |
| 3014 | } |
| 3015 | |
| 3016 | /* Prune any ports that are currently a part of mstb in our in-memory |
| 3017 | * topology, but were not seen in this link address. Usually this |
| 3018 | * means that they were removed while the topology was out of sync, |
| 3019 | * e.g. during suspend/resume |
| 3020 | */ |
| 3021 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 3022 | list_for_each_entry_safe(port, tmp, &mstb->ports, next)for (port = ({ const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = ((&mstb->ports)->next); (__typeof(*port ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*port), next ) );}), tmp = ({ const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = (port->next.next); (__typeof(*port) *)( (char *)__mptr - __builtin_offsetof(__typeof(*port), next) );}); & port->next != (&mstb->ports); port = tmp, tmp = ({ const __typeof( ((__typeof(*tmp) *)0)->next ) *__mptr = (tmp-> next.next); (__typeof(*tmp) *)( (char *)__mptr - __builtin_offsetof (__typeof(*tmp), next) );})) { |
| 3023 | if (port_mask & BIT(port->port_num)(1UL << (port->port_num))) |
| 3024 | continue; |
| 3025 | |
| 3026 | DRM_DEBUG_KMS("port %d was not in link address, removing\n",__drm_dbg(DRM_UT_KMS, "port %d was not in link address, removing\n" , port->port_num) |
| 3027 | port->port_num)__drm_dbg(DRM_UT_KMS, "port %d was not in link address, removing\n" , port->port_num); |
| 3028 | list_del(&port->next); |
| 3029 | drm_dp_mst_topology_put_port(port); |
| 3030 | changed = true1; |
| 3031 | } |
| 3032 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 3033 | |
| 3034 | out: |
| 3035 | if (ret <= 0) |
| 3036 | mstb->link_address_sent = false0; |
| 3037 | kfree(txmsg); |
| 3038 | return ret < 0 ? ret : changed; |
| 3039 | } |
| 3040 | |
| 3041 | static void |
| 3042 | drm_dp_send_clear_payload_id_table(struct drm_dp_mst_topology_mgr *mgr, |
| 3043 | struct drm_dp_mst_branch *mstb) |
| 3044 | { |
| 3045 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3046 | int ret; |
| 3047 | |
| 3048 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL(0x0001 | 0x0004)); |
| 3049 | if (!txmsg) |
| 3050 | return; |
| 3051 | |
| 3052 | txmsg->dst = mstb; |
| 3053 | build_clear_payload_id_table(txmsg); |
| 3054 | |
| 3055 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3056 | |
| 3057 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 3058 | if (ret > 0 && txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK0x01) |
| 3059 | DRM_DEBUG_KMS("clear payload table id nak received\n")__drm_dbg(DRM_UT_KMS, "clear payload table id nak received\n" ); |
| 3060 | |
| 3061 | kfree(txmsg); |
| 3062 | } |
| 3063 | |
| 3064 | static int |
| 3065 | drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
| 3066 | struct drm_dp_mst_branch *mstb, |
| 3067 | struct drm_dp_mst_port *port) |
| 3068 | { |
| 3069 | struct drm_dp_enum_path_resources_ack_reply *path_res; |
| 3070 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3071 | int ret; |
| 3072 | |
| 3073 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL(0x0001 | 0x0004)); |
| 3074 | if (!txmsg) |
| 3075 | return -ENOMEM12; |
| 3076 | |
| 3077 | txmsg->dst = mstb; |
| 3078 | build_enum_path_resources(txmsg, port->port_num); |
| 3079 | |
| 3080 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3081 | |
| 3082 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 3083 | if (ret > 0) { |
| 3084 | ret = 0; |
| 3085 | path_res = &txmsg->reply.u.path_resources; |
| 3086 | |
| 3087 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK0x01) { |
| 3088 | DRM_DEBUG_KMS("enum path resources nak received\n")__drm_dbg(DRM_UT_KMS, "enum path resources nak received\n"); |
| 3089 | } else { |
| 3090 | if (port->port_num != path_res->port_number) |
| 3091 | DRM_ERROR("got incorrect port in response\n")__drm_err("got incorrect port in response\n"); |
| 3092 | |
| 3093 | DRM_DEBUG_KMS("enum path resources %d: %d %d\n",__drm_dbg(DRM_UT_KMS, "enum path resources %d: %d %d\n", path_res ->port_number, path_res->full_payload_bw_number, path_res ->avail_payload_bw_number) |
| 3094 | path_res->port_number,__drm_dbg(DRM_UT_KMS, "enum path resources %d: %d %d\n", path_res ->port_number, path_res->full_payload_bw_number, path_res ->avail_payload_bw_number) |
| 3095 | path_res->full_payload_bw_number,__drm_dbg(DRM_UT_KMS, "enum path resources %d: %d %d\n", path_res ->port_number, path_res->full_payload_bw_number, path_res ->avail_payload_bw_number) |
| 3096 | path_res->avail_payload_bw_number)__drm_dbg(DRM_UT_KMS, "enum path resources %d: %d %d\n", path_res ->port_number, path_res->full_payload_bw_number, path_res ->avail_payload_bw_number); |
| 3097 | |
| 3098 | /* |
| 3099 | * If something changed, make sure we send a |
| 3100 | * hotplug |
| 3101 | */ |
| 3102 | if (port->full_pbn != path_res->full_payload_bw_number || |
| 3103 | port->fec_capable != path_res->fec_capable) |
| 3104 | ret = 1; |
| 3105 | |
| 3106 | port->full_pbn = path_res->full_payload_bw_number; |
| 3107 | port->fec_capable = path_res->fec_capable; |
| 3108 | } |
| 3109 | } |
| 3110 | |
| 3111 | kfree(txmsg); |
| 3112 | return ret; |
| 3113 | } |
| 3114 | |
| 3115 | static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) |
| 3116 | { |
| 3117 | if (!mstb->port_parent) |
| 3118 | return NULL((void *)0); |
| 3119 | |
| 3120 | if (mstb->port_parent->mstb != mstb) |
| 3121 | return mstb->port_parent; |
| 3122 | |
| 3123 | return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); |
| 3124 | } |
| 3125 | |
| 3126 | /* |
| 3127 | * Searches upwards in the topology starting from mstb to try to find the |
| 3128 | * closest available parent of mstb that's still connected to the rest of the |
| 3129 | * topology. This can be used in order to perform operations like releasing |
| 3130 | * payloads, where the branch device which owned the payload may no longer be |
| 3131 | * around and thus would require that the payload on the last living relative |
| 3132 | * be freed instead. |
| 3133 | */ |
| 3134 | static struct drm_dp_mst_branch * |
| 3135 | drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, |
| 3136 | struct drm_dp_mst_branch *mstb, |
| 3137 | int *port_num) |
| 3138 | { |
| 3139 | struct drm_dp_mst_branch *rmstb = NULL((void *)0); |
| 3140 | struct drm_dp_mst_port *found_port; |
| 3141 | |
| 3142 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 3143 | if (!mgr->mst_primary) |
| 3144 | goto out; |
| 3145 | |
| 3146 | do { |
| 3147 | found_port = drm_dp_get_last_connected_port_to_mstb(mstb); |
| 3148 | if (!found_port) |
| 3149 | break; |
| 3150 | |
| 3151 | if (drm_dp_mst_topology_try_get_mstb(found_port->parent)) { |
| 3152 | rmstb = found_port->parent; |
| 3153 | *port_num = found_port->port_num; |
| 3154 | } else { |
| 3155 | /* Search again, starting from this parent */ |
| 3156 | mstb = found_port->parent; |
| 3157 | } |
| 3158 | } while (!rmstb); |
| 3159 | out: |
| 3160 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 3161 | return rmstb; |
| 3162 | } |
| 3163 | |
| 3164 | static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, |
| 3165 | struct drm_dp_mst_port *port, |
| 3166 | int id, |
| 3167 | int pbn) |
| 3168 | { |
| 3169 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3170 | struct drm_dp_mst_branch *mstb; |
| 3171 | int ret, port_num; |
| 3172 | u8 sinks[DRM_DP_MAX_SDP_STREAMS16]; |
| 3173 | int i; |
| 3174 | |
| 3175 | port_num = port->port_num; |
| 3176 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
| 3177 | if (!mstb) { |
| 3178 | mstb = drm_dp_get_last_connected_port_and_mstb(mgr, |
| 3179 | port->parent, |
| 3180 | &port_num); |
| 3181 | |
| 3182 | if (!mstb) |
| 3183 | return -EINVAL22; |
| 3184 | } |
| 3185 | |
| 3186 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL(0x0001 | 0x0004)); |
| 3187 | if (!txmsg) { |
| 3188 | ret = -ENOMEM12; |
| 3189 | goto fail_put; |
| 3190 | } |
| 3191 | |
| 3192 | for (i = 0; i < port->num_sdp_streams; i++) |
| 3193 | sinks[i] = i; |
| 3194 | |
| 3195 | txmsg->dst = mstb; |
| 3196 | build_allocate_payload(txmsg, port_num, |
| 3197 | id, |
| 3198 | pbn, port->num_sdp_streams, sinks); |
| 3199 | |
| 3200 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3201 | |
| 3202 | /* |
| 3203 | * FIXME: there is a small chance that between getting the last |
| 3204 | * connected mstb and sending the payload message, the last connected |
| 3205 | * mstb could also be removed from the topology. In the future, this |
| 3206 | * needs to be fixed by restarting the |
| 3207 | * drm_dp_get_last_connected_port_and_mstb() search in the event of a |
| 3208 | * timeout if the topology is still connected to the system. |
| 3209 | */ |
| 3210 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 3211 | if (ret > 0) { |
| 3212 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK0x01) |
| 3213 | ret = -EINVAL22; |
| 3214 | else |
| 3215 | ret = 0; |
| 3216 | } |
| 3217 | kfree(txmsg); |
| 3218 | fail_put: |
| 3219 | drm_dp_mst_topology_put_mstb(mstb); |
| 3220 | return ret; |
| 3221 | } |
| 3222 | |
| 3223 | int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, |
| 3224 | struct drm_dp_mst_port *port, bool_Bool power_up) |
| 3225 | { |
| 3226 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3227 | int ret; |
| 3228 | |
| 3229 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
| 3230 | if (!port) |
| 3231 | return -EINVAL22; |
| 3232 | |
| 3233 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL(0x0001 | 0x0004)); |
| 3234 | if (!txmsg) { |
| 3235 | drm_dp_mst_topology_put_port(port); |
| 3236 | return -ENOMEM12; |
| 3237 | } |
| 3238 | |
| 3239 | txmsg->dst = port->parent; |
| 3240 | build_power_updown_phy(txmsg, port->port_num, power_up); |
| 3241 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3242 | |
| 3243 | ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg); |
| 3244 | if (ret > 0) { |
| 3245 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK0x01) |
| 3246 | ret = -EINVAL22; |
| 3247 | else |
| 3248 | ret = 0; |
| 3249 | } |
| 3250 | kfree(txmsg); |
| 3251 | drm_dp_mst_topology_put_port(port); |
| 3252 | |
| 3253 | return ret; |
| 3254 | } |
| 3255 | EXPORT_SYMBOL(drm_dp_send_power_updown_phy); |
| 3256 | |
| 3257 | int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr, |
| 3258 | struct drm_dp_mst_port *port, |
| 3259 | struct drm_dp_query_stream_enc_status_ack_reply *status) |
| 3260 | { |
| 3261 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3262 | u8 nonce[7]; |
| 3263 | int len, ret; |
| 3264 | |
| 3265 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL(0x0001 | 0x0004)); |
| 3266 | if (!txmsg) |
| 3267 | return -ENOMEM12; |
| 3268 | |
| 3269 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
| 3270 | if (!port) { |
| 3271 | ret = -EINVAL22; |
| 3272 | goto out_get_port; |
| 3273 | } |
| 3274 | |
| 3275 | get_random_bytes(nonce, sizeof(nonce)); |
| 3276 | |
| 3277 | /* |
| 3278 | * "Source device targets the QUERY_STREAM_ENCRYPTION_STATUS message |
| 3279 | * transaction at the MST Branch device directly connected to the |
| 3280 | * Source" |
| 3281 | */ |
| 3282 | txmsg->dst = mgr->mst_primary; |
| 3283 | |
| 3284 | len = build_query_stream_enc_status(txmsg, port->vcpi.vcpi, nonce); |
Value stored to 'len' is never read | |
| 3285 | |
| 3286 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3287 | |
| 3288 | ret = drm_dp_mst_wait_tx_reply(mgr->mst_primary, txmsg); |
| 3289 | if (ret < 0) { |
| 3290 | goto out; |
| 3291 | } else if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK0x01) { |
| 3292 | drm_dbg_kms(mgr->dev, "query encryption status nak received\n")drm_dev_dbg((mgr->dev)->dev, DRM_UT_KMS, "query encryption status nak received\n" ); |
| 3293 | ret = -ENXIO6; |
| 3294 | goto out; |
| 3295 | } |
| 3296 | |
| 3297 | ret = 0; |
| 3298 | memcpy(status, &txmsg->reply.u.enc_status, sizeof(*status))__builtin_memcpy((status), (&txmsg->reply.u.enc_status ), (sizeof(*status))); |
| 3299 | |
| 3300 | out: |
| 3301 | drm_dp_mst_topology_put_port(port); |
| 3302 | out_get_port: |
| 3303 | kfree(txmsg); |
| 3304 | return ret; |
| 3305 | } |
| 3306 | EXPORT_SYMBOL(drm_dp_send_query_stream_enc_status); |
| 3307 | |
| 3308 | static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
| 3309 | int id, |
| 3310 | struct drm_dp_payload *payload) |
| 3311 | { |
| 3312 | int ret; |
| 3313 | |
| 3314 | ret = drm_dp_dpcd_write_payload(mgr, id, payload); |
| 3315 | if (ret < 0) { |
| 3316 | payload->payload_state = 0; |
| 3317 | return ret; |
| 3318 | } |
| 3319 | payload->payload_state = DP_PAYLOAD_LOCAL1; |
| 3320 | return 0; |
| 3321 | } |
| 3322 | |
| 3323 | static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
| 3324 | struct drm_dp_mst_port *port, |
| 3325 | int id, |
| 3326 | struct drm_dp_payload *payload) |
| 3327 | { |
| 3328 | int ret; |
| 3329 | |
| 3330 | ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); |
| 3331 | if (ret < 0) |
| 3332 | return ret; |
| 3333 | payload->payload_state = DP_PAYLOAD_REMOTE2; |
| 3334 | return ret; |
| 3335 | } |
| 3336 | |
| 3337 | static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
| 3338 | struct drm_dp_mst_port *port, |
| 3339 | int id, |
| 3340 | struct drm_dp_payload *payload) |
| 3341 | { |
| 3342 | DRM_DEBUG_KMS("\n")__drm_dbg(DRM_UT_KMS, "\n"); |
| 3343 | /* it's okay for these to fail */ |
| 3344 | if (port) { |
| 3345 | drm_dp_payload_send_msg(mgr, port, id, 0); |
| 3346 | } |
| 3347 | |
| 3348 | drm_dp_dpcd_write_payload(mgr, id, payload); |
| 3349 | payload->payload_state = DP_PAYLOAD_DELETE_LOCAL3; |
| 3350 | return 0; |
| 3351 | } |
| 3352 | |
| 3353 | static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
| 3354 | int id, |
| 3355 | struct drm_dp_payload *payload) |
| 3356 | { |
| 3357 | payload->payload_state = 0; |
| 3358 | return 0; |
| 3359 | } |
| 3360 | |
| 3361 | /** |
| 3362 | * drm_dp_update_payload_part1() - Execute payload update part 1 |
| 3363 | * @mgr: manager to use. |
| 3364 | * |
| 3365 | * This iterates over all proposed virtual channels, and tries to |
| 3366 | * allocate space in the link for them. For 0->slots transitions, |
| 3367 | * this step just writes the VCPI to the MST device. For slots->0 |
| 3368 | * transitions, this writes the updated VCPIs and removes the |
| 3369 | * remote VC payloads. |
| 3370 | * |
| 3371 | * after calling this the driver should generate ACT and payload |
| 3372 | * packets. |
| 3373 | */ |
| 3374 | int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) |
| 3375 | { |
| 3376 | struct drm_dp_payload req_payload; |
| 3377 | struct drm_dp_mst_port *port; |
| 3378 | int i, j; |
| 3379 | int cur_slots = 1; |
| 3380 | bool_Bool skip; |
| 3381 | |
| 3382 | mutex_lock(&mgr->payload_lock)rw_enter_write(&mgr->payload_lock); |
| 3383 | for (i = 0; i < mgr->max_payloads; i++) { |
| 3384 | struct drm_dp_vcpi *vcpi = mgr->proposed_vcpis[i]; |
| 3385 | struct drm_dp_payload *payload = &mgr->payloads[i]; |
| 3386 | bool_Bool put_port = false0; |
| 3387 | |
| 3388 | /* solve the current payloads - compare to the hw ones |
| 3389 | - update the hw view */ |
| 3390 | req_payload.start_slot = cur_slots; |
| 3391 | if (vcpi) { |
| 3392 | port = container_of(vcpi, struct drm_dp_mst_port,({ const __typeof( ((struct drm_dp_mst_port *)0)->vcpi ) * __mptr = (vcpi); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_port, vcpi) );}) |
| 3393 | vcpi)({ const __typeof( ((struct drm_dp_mst_port *)0)->vcpi ) * __mptr = (vcpi); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_port, vcpi) );}); |
| 3394 | |
| 3395 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 3396 | skip = !drm_dp_mst_port_downstream_of_branch(port, mgr->mst_primary); |
| 3397 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 3398 | |
| 3399 | if (skip) { |
| 3400 | drm_dbg_kms(mgr->dev,drm_dev_dbg((mgr->dev)->dev, DRM_UT_KMS, "Virtual channel %d is not in current topology\n" , i) |
| 3401 | "Virtual channel %d is not in current topology\n",drm_dev_dbg((mgr->dev)->dev, DRM_UT_KMS, "Virtual channel %d is not in current topology\n" , i) |
| 3402 | i)drm_dev_dbg((mgr->dev)->dev, DRM_UT_KMS, "Virtual channel %d is not in current topology\n" , i); |
| 3403 | continue; |
| 3404 | } |
| 3405 | /* Validated ports don't matter if we're releasing |
| 3406 | * VCPI |
| 3407 | */ |
| 3408 | if (vcpi->num_slots) { |
| 3409 | port = drm_dp_mst_topology_get_port_validated( |
| 3410 | mgr, port); |
| 3411 | if (!port) { |
| 3412 | if (vcpi->num_slots == payload->num_slots) { |
| 3413 | cur_slots += vcpi->num_slots; |
| 3414 | payload->start_slot = req_payload.start_slot; |
| 3415 | continue; |
| 3416 | } else { |
| 3417 | drm_dbg_kms(mgr->dev,drm_dev_dbg((mgr->dev)->dev, DRM_UT_KMS, "Fail:set payload to invalid sink" ) |
| 3418 | "Fail:set payload to invalid sink")drm_dev_dbg((mgr->dev)->dev, DRM_UT_KMS, "Fail:set payload to invalid sink" ); |
| 3419 | mutex_unlock(&mgr->payload_lock)rw_exit_write(&mgr->payload_lock); |
| 3420 | return -EINVAL22; |
| 3421 | } |
| 3422 | } |
| 3423 | put_port = true1; |
| 3424 | } |
| 3425 | |
| 3426 | req_payload.num_slots = vcpi->num_slots; |
| 3427 | req_payload.vcpi = vcpi->vcpi; |
| 3428 | } else { |
| 3429 | port = NULL((void *)0); |
| 3430 | req_payload.num_slots = 0; |
| 3431 | } |
| 3432 | |
| 3433 | payload->start_slot = req_payload.start_slot; |
| 3434 | /* work out what is required to happen with this payload */ |
| 3435 | if (payload->num_slots != req_payload.num_slots) { |
| 3436 | |
| 3437 | /* need to push an update for this payload */ |
| 3438 | if (req_payload.num_slots) { |
| 3439 | drm_dp_create_payload_step1(mgr, vcpi->vcpi, |
| 3440 | &req_payload); |
| 3441 | payload->num_slots = req_payload.num_slots; |
| 3442 | payload->vcpi = req_payload.vcpi; |
| 3443 | |
| 3444 | } else if (payload->num_slots) { |
| 3445 | payload->num_slots = 0; |
| 3446 | drm_dp_destroy_payload_step1(mgr, port, |
| 3447 | payload->vcpi, |
| 3448 | payload); |
| 3449 | req_payload.payload_state = |
| 3450 | payload->payload_state; |
| 3451 | payload->start_slot = 0; |
| 3452 | } |
| 3453 | payload->payload_state = req_payload.payload_state; |
| 3454 | } |
| 3455 | cur_slots += req_payload.num_slots; |
| 3456 | |
| 3457 | if (put_port) |
| 3458 | drm_dp_mst_topology_put_port(port); |
| 3459 | } |
| 3460 | |
| 3461 | for (i = 0; i < mgr->max_payloads; /* do nothing */) { |
| 3462 | if (mgr->payloads[i].payload_state != DP_PAYLOAD_DELETE_LOCAL3) { |
| 3463 | i++; |
| 3464 | continue; |
| 3465 | } |
| 3466 | |
| 3467 | DRM_DEBUG_KMS("removing payload %d\n", i)__drm_dbg(DRM_UT_KMS, "removing payload %d\n", i); |
| 3468 | for (j = i; j < mgr->max_payloads - 1; j++) { |
| 3469 | mgr->payloads[j] = mgr->payloads[j + 1]; |
| 3470 | mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; |
| 3471 | |
| 3472 | if (mgr->proposed_vcpis[j] && |
| 3473 | mgr->proposed_vcpis[j]->num_slots) { |
| 3474 | set_bit(j + 1, &mgr->payload_mask); |
| 3475 | } else { |
| 3476 | clear_bit(j + 1, &mgr->payload_mask); |
| 3477 | } |
| 3478 | } |
| 3479 | |
| 3480 | memset(&mgr->payloads[mgr->max_payloads - 1], 0,__builtin_memset((&mgr->payloads[mgr->max_payloads - 1]), (0), (sizeof(struct drm_dp_payload))) |
| 3481 | sizeof(struct drm_dp_payload))__builtin_memset((&mgr->payloads[mgr->max_payloads - 1]), (0), (sizeof(struct drm_dp_payload))); |
| 3482 | mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL((void *)0); |
| 3483 | clear_bit(mgr->max_payloads, &mgr->payload_mask); |
| 3484 | } |
| 3485 | mutex_unlock(&mgr->payload_lock)rw_exit_write(&mgr->payload_lock); |
| 3486 | |
| 3487 | return 0; |
| 3488 | } |
| 3489 | EXPORT_SYMBOL(drm_dp_update_payload_part1); |
| 3490 | |
| 3491 | /** |
| 3492 | * drm_dp_update_payload_part2() - Execute payload update part 2 |
| 3493 | * @mgr: manager to use. |
| 3494 | * |
| 3495 | * This iterates over all proposed virtual channels, and tries to |
| 3496 | * allocate space in the link for them. For 0->slots transitions, |
| 3497 | * this step writes the remote VC payload commands. For slots->0 |
| 3498 | * this just resets some internal state. |
| 3499 | */ |
| 3500 | int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) |
| 3501 | { |
| 3502 | struct drm_dp_mst_port *port; |
| 3503 | int i; |
| 3504 | int ret = 0; |
| 3505 | bool_Bool skip; |
| 3506 | |
| 3507 | mutex_lock(&mgr->payload_lock)rw_enter_write(&mgr->payload_lock); |
| 3508 | for (i = 0; i < mgr->max_payloads; i++) { |
| 3509 | |
| 3510 | if (!mgr->proposed_vcpis[i]) |
| 3511 | continue; |
| 3512 | |
| 3513 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi)({ const __typeof( ((struct drm_dp_mst_port *)0)->vcpi ) * __mptr = (mgr->proposed_vcpis[i]); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_port , vcpi) );}); |
| 3514 | |
| 3515 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 3516 | skip = !drm_dp_mst_port_downstream_of_branch(port, mgr->mst_primary); |
| 3517 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 3518 | |
| 3519 | if (skip) |
| 3520 | continue; |
| 3521 | |
| 3522 | DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state)__drm_dbg(DRM_UT_KMS, "payload %d %d\n", i, mgr->payloads[ i].payload_state); |
| 3523 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL1) { |
| 3524 | ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
| 3525 | } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL3) { |
| 3526 | ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
| 3527 | } |
| 3528 | if (ret) { |
| 3529 | mutex_unlock(&mgr->payload_lock)rw_exit_write(&mgr->payload_lock); |
| 3530 | return ret; |
| 3531 | } |
| 3532 | } |
| 3533 | mutex_unlock(&mgr->payload_lock)rw_exit_write(&mgr->payload_lock); |
| 3534 | return 0; |
| 3535 | } |
| 3536 | EXPORT_SYMBOL(drm_dp_update_payload_part2); |
| 3537 | |
| 3538 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, |
| 3539 | struct drm_dp_mst_port *port, |
| 3540 | int offset, int size, u8 *bytes) |
| 3541 | { |
| 3542 | int ret = 0; |
| 3543 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3544 | struct drm_dp_mst_branch *mstb; |
| 3545 | |
| 3546 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
| 3547 | if (!mstb) |
| 3548 | return -EINVAL22; |
| 3549 | |
| 3550 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL(0x0001 | 0x0004)); |
| 3551 | if (!txmsg) { |
| 3552 | ret = -ENOMEM12; |
| 3553 | goto fail_put; |
| 3554 | } |
| 3555 | |
| 3556 | build_dpcd_read(txmsg, port->port_num, offset, size); |
| 3557 | txmsg->dst = port->parent; |
| 3558 | |
| 3559 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3560 | |
| 3561 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 3562 | if (ret < 0) |
| 3563 | goto fail_free; |
| 3564 | |
| 3565 | /* DPCD read should never be NACKed */ |
| 3566 | if (txmsg->reply.reply_type == 1) { |
| 3567 | DRM_ERROR("mstb %p port %d: DPCD read on addr 0x%x for %d bytes NAKed\n",__drm_err("mstb %p port %d: DPCD read on addr 0x%x for %d bytes NAKed\n" , mstb, port->port_num, offset, size) |
| 3568 | mstb, port->port_num, offset, size)__drm_err("mstb %p port %d: DPCD read on addr 0x%x for %d bytes NAKed\n" , mstb, port->port_num, offset, size); |
| 3569 | ret = -EIO5; |
| 3570 | goto fail_free; |
| 3571 | } |
| 3572 | |
| 3573 | if (txmsg->reply.u.remote_dpcd_read_ack.num_bytes != size) { |
| 3574 | ret = -EPROTO95; |
| 3575 | goto fail_free; |
| 3576 | } |
| 3577 | |
| 3578 | ret = min_t(size_t, txmsg->reply.u.remote_dpcd_read_ack.num_bytes,({ size_t __min_a = (txmsg->reply.u.remote_dpcd_read_ack.num_bytes ); size_t __min_b = (size); __min_a < __min_b ? __min_a : __min_b ; }) |
| 3579 | size)({ size_t __min_a = (txmsg->reply.u.remote_dpcd_read_ack.num_bytes ); size_t __min_b = (size); __min_a < __min_b ? __min_a : __min_b ; }); |
| 3580 | memcpy(bytes, txmsg->reply.u.remote_dpcd_read_ack.bytes, ret)__builtin_memcpy((bytes), (txmsg->reply.u.remote_dpcd_read_ack .bytes), (ret)); |
| 3581 | |
| 3582 | fail_free: |
| 3583 | kfree(txmsg); |
| 3584 | fail_put: |
| 3585 | drm_dp_mst_topology_put_mstb(mstb); |
| 3586 | |
| 3587 | return ret; |
| 3588 | } |
| 3589 | |
| 3590 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
| 3591 | struct drm_dp_mst_port *port, |
| 3592 | int offset, int size, u8 *bytes) |
| 3593 | { |
| 3594 | int ret; |
| 3595 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3596 | struct drm_dp_mst_branch *mstb; |
| 3597 | |
| 3598 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
| 3599 | if (!mstb) |
| 3600 | return -EINVAL22; |
| 3601 | |
| 3602 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL(0x0001 | 0x0004)); |
| 3603 | if (!txmsg) { |
| 3604 | ret = -ENOMEM12; |
| 3605 | goto fail_put; |
| 3606 | } |
| 3607 | |
| 3608 | build_dpcd_write(txmsg, port->port_num, offset, size, bytes); |
| 3609 | txmsg->dst = mstb; |
| 3610 | |
| 3611 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3612 | |
| 3613 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 3614 | if (ret > 0) { |
| 3615 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK0x01) |
| 3616 | ret = -EIO5; |
| 3617 | else |
| 3618 | ret = size; |
| 3619 | } |
| 3620 | |
| 3621 | kfree(txmsg); |
| 3622 | fail_put: |
| 3623 | drm_dp_mst_topology_put_mstb(mstb); |
| 3624 | return ret; |
| 3625 | } |
| 3626 | |
| 3627 | static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) |
| 3628 | { |
| 3629 | struct drm_dp_sideband_msg_reply_body reply; |
| 3630 | |
| 3631 | reply.reply_type = DP_SIDEBAND_REPLY_ACK0x00; |
| 3632 | reply.req_type = req_type; |
| 3633 | drm_dp_encode_sideband_reply(&reply, msg); |
| 3634 | return 0; |
| 3635 | } |
| 3636 | |
| 3637 | static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, |
| 3638 | struct drm_dp_mst_branch *mstb, |
| 3639 | int req_type, bool_Bool broadcast) |
| 3640 | { |
| 3641 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3642 | |
| 3643 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL(0x0001 | 0x0004)); |
| 3644 | if (!txmsg) |
| 3645 | return -ENOMEM12; |
| 3646 | |
| 3647 | txmsg->dst = mstb; |
| 3648 | drm_dp_encode_up_ack_reply(txmsg, req_type); |
| 3649 | |
| 3650 | mutex_lock(&mgr->qlock)rw_enter_write(&mgr->qlock); |
| 3651 | /* construct a chunk from the first msg in the tx_msg queue */ |
| 3652 | process_single_tx_qlock(mgr, txmsg, true1); |
| 3653 | mutex_unlock(&mgr->qlock)rw_exit_write(&mgr->qlock); |
| 3654 | |
| 3655 | kfree(txmsg); |
| 3656 | return 0; |
| 3657 | } |
| 3658 | |
| 3659 | /** |
| 3660 | * drm_dp_get_vc_payload_bw - get the VC payload BW for an MST link |
| 3661 | * @link_rate: link rate in 10kbits/s units |
| 3662 | * @link_lane_count: lane count |
| 3663 | * |
| 3664 | * Calculate the total bandwidth of a MultiStream Transport link. The returned |
| 3665 | * value is in units of PBNs/(timeslots/1 MTP). This value can be used to |
| 3666 | * convert the number of PBNs required for a given stream to the number of |
| 3667 | * timeslots this stream requires in each MTP. |
| 3668 | */ |
| 3669 | int drm_dp_get_vc_payload_bw(int link_rate, int link_lane_count) |
| 3670 | { |
| 3671 | if (link_rate == 0 || link_lane_count == 0) |
| 3672 | DRM_DEBUG_KMS("invalid link rate/lane count: (%d / %d)\n",__drm_dbg(DRM_UT_KMS, "invalid link rate/lane count: (%d / %d)\n" , link_rate, link_lane_count) |
| 3673 | link_rate, link_lane_count)__drm_dbg(DRM_UT_KMS, "invalid link rate/lane count: (%d / %d)\n" , link_rate, link_lane_count); |
| 3674 | |
| 3675 | /* See DP v2.0 2.6.4.2, VCPayload_Bandwidth_for_OneTimeSlotPer_MTP_Allocation */ |
| 3676 | return link_rate * link_lane_count / 54000; |
| 3677 | } |
| 3678 | EXPORT_SYMBOL(drm_dp_get_vc_payload_bw); |
| 3679 | |
| 3680 | /** |
| 3681 | * drm_dp_read_mst_cap() - check whether or not a sink supports MST |
| 3682 | * @aux: The DP AUX channel to use |
| 3683 | * @dpcd: A cached copy of the DPCD capabilities for this sink |
| 3684 | * |
| 3685 | * Returns: %True if the sink supports MST, %false otherwise |
| 3686 | */ |
| 3687 | bool_Bool drm_dp_read_mst_cap(struct drm_dp_aux *aux, |
| 3688 | const u8 dpcd[DP_RECEIVER_CAP_SIZE0xf]) |
| 3689 | { |
| 3690 | u8 mstm_cap; |
| 3691 | |
| 3692 | if (dpcd[DP_DPCD_REV0x000] < DP_DPCD_REV_120x12) |
| 3693 | return false0; |
| 3694 | |
| 3695 | if (drm_dp_dpcd_readb(aux, DP_MSTM_CAP0x021, &mstm_cap) != 1) |
| 3696 | return false0; |
| 3697 | |
| 3698 | return mstm_cap & DP_MST_CAP(1 << 0); |
| 3699 | } |
| 3700 | EXPORT_SYMBOL(drm_dp_read_mst_cap); |
| 3701 | |
| 3702 | /** |
| 3703 | * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager |
| 3704 | * @mgr: manager to set state for |
| 3705 | * @mst_state: true to enable MST on this connector - false to disable. |
| 3706 | * |
| 3707 | * This is called by the driver when it detects an MST capable device plugged |
| 3708 | * into a DP MST capable port, or when a DP MST capable device is unplugged. |
| 3709 | */ |
| 3710 | int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool_Bool mst_state) |
| 3711 | { |
| 3712 | int ret = 0; |
| 3713 | struct drm_dp_mst_branch *mstb = NULL((void *)0); |
| 3714 | |
| 3715 | mutex_lock(&mgr->payload_lock)rw_enter_write(&mgr->payload_lock); |
| 3716 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 3717 | if (mst_state == mgr->mst_state) |
| 3718 | goto out_unlock; |
| 3719 | |
| 3720 | mgr->mst_state = mst_state; |
| 3721 | /* set the device into MST mode */ |
| 3722 | if (mst_state) { |
| 3723 | struct drm_dp_payload reset_pay; |
| 3724 | |
| 3725 | WARN_ON(mgr->mst_primary)({ int __ret = !!(mgr->mst_primary); if (__ret) printf("WARNING %s failed at %s:%d\n" , "mgr->mst_primary", "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c" , 3725); __builtin_expect(!!(__ret), 0); }); |
| 3726 | |
| 3727 | /* get dpcd info */ |
| 3728 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV0x000, mgr->dpcd, DP_RECEIVER_CAP_SIZE0xf); |
| 3729 | if (ret != DP_RECEIVER_CAP_SIZE0xf) { |
| 3730 | DRM_DEBUG_KMS("failed to read DPCD\n")__drm_dbg(DRM_UT_KMS, "failed to read DPCD\n"); |
| 3731 | goto out_unlock; |
| 3732 | } |
| 3733 | |
| 3734 | mgr->pbn_div = drm_dp_get_vc_payload_bw(drm_dp_bw_code_to_link_rate(mgr->dpcd[1]), |
| 3735 | mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK0x1f); |
| 3736 | if (mgr->pbn_div == 0) { |
| 3737 | ret = -EINVAL22; |
| 3738 | goto out_unlock; |
| 3739 | } |
| 3740 | |
| 3741 | /* add initial branch device at LCT 1 */ |
| 3742 | mstb = drm_dp_add_mst_branch_device(1, NULL((void *)0)); |
| 3743 | if (mstb == NULL((void *)0)) { |
| 3744 | ret = -ENOMEM12; |
| 3745 | goto out_unlock; |
| 3746 | } |
| 3747 | mstb->mgr = mgr; |
| 3748 | |
| 3749 | /* give this the main reference */ |
| 3750 | mgr->mst_primary = mstb; |
| 3751 | drm_dp_mst_topology_get_mstb(mgr->mst_primary); |
| 3752 | |
| 3753 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL0x111, |
| 3754 | DP_MST_EN(1 << 0) | |
| 3755 | DP_UP_REQ_EN(1 << 1) | |
| 3756 | DP_UPSTREAM_IS_SRC(1 << 2)); |
| 3757 | if (ret < 0) |
| 3758 | goto out_unlock; |
| 3759 | |
| 3760 | reset_pay.start_slot = 0; |
| 3761 | reset_pay.num_slots = 0x3f; |
| 3762 | drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); |
| 3763 | |
| 3764 | queue_work(system_long_wq, &mgr->work); |
| 3765 | |
| 3766 | ret = 0; |
| 3767 | } else { |
| 3768 | /* disable MST on the device */ |
| 3769 | mstb = mgr->mst_primary; |
| 3770 | mgr->mst_primary = NULL((void *)0); |
| 3771 | /* this can fail if the device is gone */ |
| 3772 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL0x111, 0); |
| 3773 | ret = 0; |
| 3774 | memset(mgr->payloads, 0,__builtin_memset((mgr->payloads), (0), (mgr->max_payloads * sizeof(mgr->payloads[0]))) |
| 3775 | mgr->max_payloads * sizeof(mgr->payloads[0]))__builtin_memset((mgr->payloads), (0), (mgr->max_payloads * sizeof(mgr->payloads[0]))); |
| 3776 | memset(mgr->proposed_vcpis, 0,__builtin_memset((mgr->proposed_vcpis), (0), (mgr->max_payloads * sizeof(mgr->proposed_vcpis[0]))) |
| 3777 | mgr->max_payloads * sizeof(mgr->proposed_vcpis[0]))__builtin_memset((mgr->proposed_vcpis), (0), (mgr->max_payloads * sizeof(mgr->proposed_vcpis[0]))); |
| 3778 | mgr->payload_mask = 0; |
| 3779 | set_bit(0, &mgr->payload_mask); |
| 3780 | mgr->vcpi_mask = 0; |
| 3781 | mgr->payload_id_table_cleared = false0; |
| 3782 | } |
| 3783 | |
| 3784 | out_unlock: |
| 3785 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 3786 | mutex_unlock(&mgr->payload_lock)rw_exit_write(&mgr->payload_lock); |
| 3787 | if (mstb) |
| 3788 | drm_dp_mst_topology_put_mstb(mstb); |
| 3789 | return ret; |
| 3790 | |
| 3791 | } |
| 3792 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); |
| 3793 | |
| 3794 | static void |
| 3795 | drm_dp_mst_topology_mgr_invalidate_mstb(struct drm_dp_mst_branch *mstb) |
| 3796 | { |
| 3797 | struct drm_dp_mst_port *port; |
| 3798 | |
| 3799 | /* The link address will need to be re-sent on resume */ |
| 3800 | mstb->link_address_sent = false0; |
| 3801 | |
| 3802 | list_for_each_entry(port, &mstb->ports, next)for (port = ({ const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = ((&mstb->ports)->next); (__typeof(*port ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*port), next ) );}); &port->next != (&mstb->ports); port = ( { const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = (port->next.next); (__typeof(*port) *)( (char *)__mptr - __builtin_offsetof (__typeof(*port), next) );})) |
| 3803 | if (port->mstb) |
| 3804 | drm_dp_mst_topology_mgr_invalidate_mstb(port->mstb); |
| 3805 | } |
| 3806 | |
| 3807 | /** |
| 3808 | * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager |
| 3809 | * @mgr: manager to suspend |
| 3810 | * |
| 3811 | * This function tells the MST device that we can't handle UP messages |
| 3812 | * anymore. This should stop it from sending any since we are suspended. |
| 3813 | */ |
| 3814 | void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) |
| 3815 | { |
| 3816 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 3817 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL0x111, |
| 3818 | DP_MST_EN(1 << 0) | DP_UPSTREAM_IS_SRC(1 << 2)); |
| 3819 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 3820 | flush_work(&mgr->up_req_work); |
| 3821 | flush_work(&mgr->work); |
| 3822 | flush_work(&mgr->delayed_destroy_work); |
| 3823 | |
| 3824 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 3825 | if (mgr->mst_state && mgr->mst_primary) |
| 3826 | drm_dp_mst_topology_mgr_invalidate_mstb(mgr->mst_primary); |
| 3827 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 3828 | } |
| 3829 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); |
| 3830 | |
| 3831 | /** |
| 3832 | * drm_dp_mst_topology_mgr_resume() - resume the MST manager |
| 3833 | * @mgr: manager to resume |
| 3834 | * @sync: whether or not to perform topology reprobing synchronously |
| 3835 | * |
| 3836 | * This will fetch DPCD and see if the device is still there, |
| 3837 | * if it is, it will rewrite the MSTM control bits, and return. |
| 3838 | * |
| 3839 | * If the device fails this returns -1, and the driver should do |
| 3840 | * a full MST reprobe, in case we were undocked. |
| 3841 | * |
| 3842 | * During system resume (where it is assumed that the driver will be calling |
| 3843 | * drm_atomic_helper_resume()) this function should be called beforehand with |
| 3844 | * @sync set to true. In contexts like runtime resume where the driver is not |
| 3845 | * expected to be calling drm_atomic_helper_resume(), this function should be |
| 3846 | * called with @sync set to false in order to avoid deadlocking. |
| 3847 | * |
| 3848 | * Returns: -1 if the MST topology was removed while we were suspended, 0 |
| 3849 | * otherwise. |
| 3850 | */ |
| 3851 | int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, |
| 3852 | bool_Bool sync) |
| 3853 | { |
| 3854 | int ret; |
| 3855 | u8 guid[16]; |
| 3856 | |
| 3857 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 3858 | if (!mgr->mst_primary) |
| 3859 | goto out_fail; |
| 3860 | |
| 3861 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV0x000, mgr->dpcd, |
| 3862 | DP_RECEIVER_CAP_SIZE0xf); |
| 3863 | if (ret != DP_RECEIVER_CAP_SIZE0xf) { |
| 3864 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n")__drm_dbg(DRM_UT_KMS, "dpcd read failed - undocked during suspend?\n" ); |
| 3865 | goto out_fail; |
| 3866 | } |
| 3867 | |
| 3868 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL0x111, |
| 3869 | DP_MST_EN(1 << 0) | |
| 3870 | DP_UP_REQ_EN(1 << 1) | |
| 3871 | DP_UPSTREAM_IS_SRC(1 << 2)); |
| 3872 | if (ret < 0) { |
| 3873 | DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n")__drm_dbg(DRM_UT_KMS, "mst write failed - undocked during suspend?\n" ); |
| 3874 | goto out_fail; |
| 3875 | } |
| 3876 | |
| 3877 | /* Some hubs forget their guids after they resume */ |
| 3878 | ret = drm_dp_dpcd_read(mgr->aux, DP_GUID0x030, guid, 16); |
| 3879 | if (ret != 16) { |
| 3880 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n")__drm_dbg(DRM_UT_KMS, "dpcd read failed - undocked during suspend?\n" ); |
| 3881 | goto out_fail; |
| 3882 | } |
| 3883 | |
| 3884 | ret = drm_dp_check_mstb_guid(mgr->mst_primary, guid); |
| 3885 | if (ret) { |
| 3886 | DRM_DEBUG_KMS("check mstb failed - undocked during suspend?\n")__drm_dbg(DRM_UT_KMS, "check mstb failed - undocked during suspend?\n" ); |
| 3887 | goto out_fail; |
| 3888 | } |
| 3889 | |
| 3890 | /* |
| 3891 | * For the final step of resuming the topology, we need to bring the |
| 3892 | * state of our in-memory topology back into sync with reality. So, |
| 3893 | * restart the probing process as if we're probing a new hub |
| 3894 | */ |
| 3895 | queue_work(system_long_wq, &mgr->work); |
| 3896 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 3897 | |
| 3898 | if (sync) { |
| 3899 | DRM_DEBUG_KMS("Waiting for link probe work to finish re-syncing topology...\n")__drm_dbg(DRM_UT_KMS, "Waiting for link probe work to finish re-syncing topology...\n" ); |
| 3900 | flush_work(&mgr->work); |
| 3901 | } |
| 3902 | |
| 3903 | return 0; |
| 3904 | |
| 3905 | out_fail: |
| 3906 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 3907 | return -1; |
| 3908 | } |
| 3909 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); |
| 3910 | |
| 3911 | static bool_Bool |
| 3912 | drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool_Bool up, |
| 3913 | struct drm_dp_mst_branch **mstb) |
| 3914 | { |
| 3915 | int len; |
| 3916 | u8 replyblock[32]; |
| 3917 | int replylen, curreply; |
| 3918 | int ret; |
| 3919 | u8 hdrlen; |
| 3920 | struct drm_dp_sideband_msg_hdr hdr; |
| 3921 | struct drm_dp_sideband_msg_rx *msg = |
| 3922 | up ? &mgr->up_req_recv : &mgr->down_rep_recv; |
| 3923 | int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE0x1600 : |
| 3924 | DP_SIDEBAND_MSG_DOWN_REP_BASE0x1400; |
| 3925 | |
| 3926 | if (!up) |
| 3927 | *mstb = NULL((void *)0); |
| 3928 | |
| 3929 | len = min(mgr->max_dpcd_transaction_bytes, 16)(((mgr->max_dpcd_transaction_bytes)<(16))?(mgr->max_dpcd_transaction_bytes ):(16)); |
| 3930 | ret = drm_dp_dpcd_read(mgr->aux, basereg, replyblock, len); |
| 3931 | if (ret != len) { |
| 3932 | DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret)__drm_dbg(DRM_UT_KMS, "failed to read DPCD down rep %d %d\n", len, ret); |
| 3933 | return false0; |
| 3934 | } |
| 3935 | |
| 3936 | ret = drm_dp_decode_sideband_msg_hdr(&hdr, replyblock, len, &hdrlen); |
| 3937 | if (ret == false0) { |
| 3938 | print_hex_dump(KERN_DEBUG"\0017", "failed hdr", DUMP_PREFIX_NONE, 16, |
| 3939 | 1, replyblock, len, false0); |
| 3940 | DRM_DEBUG_KMS("ERROR: failed header\n")__drm_dbg(DRM_UT_KMS, "ERROR: failed header\n"); |
| 3941 | return false0; |
| 3942 | } |
| 3943 | |
| 3944 | if (!up) { |
| 3945 | /* Caller is responsible for giving back this reference */ |
| 3946 | *mstb = drm_dp_get_mst_branch_device(mgr, hdr.lct, hdr.rad); |
| 3947 | if (!*mstb) { |
| 3948 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n",__drm_dbg(DRM_UT_KMS, "Got MST reply from unknown device %d\n" , hdr.lct) |
| 3949 | hdr.lct)__drm_dbg(DRM_UT_KMS, "Got MST reply from unknown device %d\n" , hdr.lct); |
| 3950 | return false0; |
| 3951 | } |
| 3952 | } |
| 3953 | |
| 3954 | if (!drm_dp_sideband_msg_set_header(msg, &hdr, hdrlen)) { |
| 3955 | DRM_DEBUG_KMS("sideband msg set header failed %d\n",__drm_dbg(DRM_UT_KMS, "sideband msg set header failed %d\n", replyblock [0]) |
| 3956 | replyblock[0])__drm_dbg(DRM_UT_KMS, "sideband msg set header failed %d\n", replyblock [0]); |
| 3957 | return false0; |
| 3958 | } |
| 3959 | |
| 3960 | replylen = min(msg->curchunk_len, (u8)(len - hdrlen))(((msg->curchunk_len)<((u8)(len - hdrlen)))?(msg->curchunk_len ):((u8)(len - hdrlen))); |
| 3961 | ret = drm_dp_sideband_append_payload(msg, replyblock + hdrlen, replylen); |
| 3962 | if (!ret) { |
| 3963 | DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0])__drm_dbg(DRM_UT_KMS, "sideband msg build failed %d\n", replyblock [0]); |
| 3964 | return false0; |
| 3965 | } |
| 3966 | |
| 3967 | replylen = msg->curchunk_len + msg->curchunk_hdrlen - len; |
| 3968 | curreply = len; |
| 3969 | while (replylen > 0) { |
| 3970 | len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16)(((replylen)<((((mgr->max_dpcd_transaction_bytes)<(16 ))?(mgr->max_dpcd_transaction_bytes):(16))))?(replylen):(( ((mgr->max_dpcd_transaction_bytes)<(16))?(mgr->max_dpcd_transaction_bytes ):(16)))); |
| 3971 | ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, |
| 3972 | replyblock, len); |
| 3973 | if (ret != len) { |
| 3974 | DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n",__drm_dbg(DRM_UT_KMS, "failed to read a chunk (len %d, ret %d)\n" , len, ret) |
| 3975 | len, ret)__drm_dbg(DRM_UT_KMS, "failed to read a chunk (len %d, ret %d)\n" , len, ret); |
| 3976 | return false0; |
| 3977 | } |
| 3978 | |
| 3979 | ret = drm_dp_sideband_append_payload(msg, replyblock, len); |
| 3980 | if (!ret) { |
| 3981 | DRM_DEBUG_KMS("failed to build sideband msg\n")__drm_dbg(DRM_UT_KMS, "failed to build sideband msg\n"); |
| 3982 | return false0; |
| 3983 | } |
| 3984 | |
| 3985 | curreply += len; |
| 3986 | replylen -= len; |
| 3987 | } |
| 3988 | return true1; |
| 3989 | } |
| 3990 | |
| 3991 | static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) |
| 3992 | { |
| 3993 | struct drm_dp_sideband_msg_tx *txmsg; |
| 3994 | struct drm_dp_mst_branch *mstb = NULL((void *)0); |
| 3995 | struct drm_dp_sideband_msg_rx *msg = &mgr->down_rep_recv; |
| 3996 | |
| 3997 | if (!drm_dp_get_one_sb_msg(mgr, false0, &mstb)) |
| 3998 | goto out; |
| 3999 | |
| 4000 | /* Multi-packet message transmission, don't clear the reply */ |
| 4001 | if (!msg->have_eomt) |
| 4002 | goto out; |
| 4003 | |
| 4004 | /* find the message */ |
| 4005 | mutex_lock(&mgr->qlock)rw_enter_write(&mgr->qlock); |
| 4006 | txmsg = list_first_entry_or_null(&mgr->tx_msg_downq,(list_empty(&mgr->tx_msg_downq) ? ((void *)0) : ({ const __typeof( ((struct drm_dp_sideband_msg_tx *)0)->next ) *__mptr = ((&mgr->tx_msg_downq)->next); (struct drm_dp_sideband_msg_tx *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_sideband_msg_tx , next) );})) |
| 4007 | struct drm_dp_sideband_msg_tx, next)(list_empty(&mgr->tx_msg_downq) ? ((void *)0) : ({ const __typeof( ((struct drm_dp_sideband_msg_tx *)0)->next ) *__mptr = ((&mgr->tx_msg_downq)->next); (struct drm_dp_sideband_msg_tx *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_sideband_msg_tx , next) );})); |
| 4008 | mutex_unlock(&mgr->qlock)rw_exit_write(&mgr->qlock); |
| 4009 | |
| 4010 | /* Were we actually expecting a response, and from this mstb? */ |
| 4011 | if (!txmsg || txmsg->dst != mstb) { |
| 4012 | struct drm_dp_sideband_msg_hdr *hdr; |
| 4013 | |
| 4014 | hdr = &msg->initial_hdr; |
| 4015 | DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",__drm_dbg(DRM_UT_KMS, "Got MST reply with no msg %p %d %d %02x %02x\n" , mstb, hdr->seqno, hdr->lct, hdr->rad[0], msg->msg [0]) |
| 4016 | mstb, hdr->seqno, hdr->lct, hdr->rad[0],__drm_dbg(DRM_UT_KMS, "Got MST reply with no msg %p %d %d %02x %02x\n" , mstb, hdr->seqno, hdr->lct, hdr->rad[0], msg->msg [0]) |
| 4017 | msg->msg[0])__drm_dbg(DRM_UT_KMS, "Got MST reply with no msg %p %d %d %02x %02x\n" , mstb, hdr->seqno, hdr->lct, hdr->rad[0], msg->msg [0]); |
| 4018 | goto out_clear_reply; |
| 4019 | } |
| 4020 | |
| 4021 | drm_dp_sideband_parse_reply(msg, &txmsg->reply); |
| 4022 | |
| 4023 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK0x01) { |
| 4024 | DRM_DEBUG_KMS("Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n",__drm_dbg(DRM_UT_KMS, "Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n" , txmsg->reply.req_type, drm_dp_mst_req_type_str(txmsg-> reply.req_type), txmsg->reply.u.nak.reason, drm_dp_mst_nak_reason_str (txmsg->reply.u.nak.reason), txmsg->reply.u.nak.nak_data ) |
| 4025 | txmsg->reply.req_type,__drm_dbg(DRM_UT_KMS, "Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n" , txmsg->reply.req_type, drm_dp_mst_req_type_str(txmsg-> reply.req_type), txmsg->reply.u.nak.reason, drm_dp_mst_nak_reason_str (txmsg->reply.u.nak.reason), txmsg->reply.u.nak.nak_data ) |
| 4026 | drm_dp_mst_req_type_str(txmsg->reply.req_type),__drm_dbg(DRM_UT_KMS, "Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n" , txmsg->reply.req_type, drm_dp_mst_req_type_str(txmsg-> reply.req_type), txmsg->reply.u.nak.reason, drm_dp_mst_nak_reason_str (txmsg->reply.u.nak.reason), txmsg->reply.u.nak.nak_data ) |
| 4027 | txmsg->reply.u.nak.reason,__drm_dbg(DRM_UT_KMS, "Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n" , txmsg->reply.req_type, drm_dp_mst_req_type_str(txmsg-> reply.req_type), txmsg->reply.u.nak.reason, drm_dp_mst_nak_reason_str (txmsg->reply.u.nak.reason), txmsg->reply.u.nak.nak_data ) |
| 4028 | drm_dp_mst_nak_reason_str(txmsg->reply.u.nak.reason),__drm_dbg(DRM_UT_KMS, "Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n" , txmsg->reply.req_type, drm_dp_mst_req_type_str(txmsg-> reply.req_type), txmsg->reply.u.nak.reason, drm_dp_mst_nak_reason_str (txmsg->reply.u.nak.reason), txmsg->reply.u.nak.nak_data ) |
| 4029 | txmsg->reply.u.nak.nak_data)__drm_dbg(DRM_UT_KMS, "Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n" , txmsg->reply.req_type, drm_dp_mst_req_type_str(txmsg-> reply.req_type), txmsg->reply.u.nak.reason, drm_dp_mst_nak_reason_str (txmsg->reply.u.nak.reason), txmsg->reply.u.nak.nak_data ); |
| 4030 | } |
| 4031 | |
| 4032 | memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx))__builtin_memset((msg), (0), (sizeof(struct drm_dp_sideband_msg_rx ))); |
| 4033 | drm_dp_mst_topology_put_mstb(mstb); |
| 4034 | |
| 4035 | mutex_lock(&mgr->qlock)rw_enter_write(&mgr->qlock); |
| 4036 | txmsg->state = DRM_DP_SIDEBAND_TX_RX3; |
| 4037 | list_del(&txmsg->next); |
| 4038 | mutex_unlock(&mgr->qlock)rw_exit_write(&mgr->qlock); |
| 4039 | |
| 4040 | wake_up_all(&mgr->tx_waitq)wake_up(&mgr->tx_waitq); |
| 4041 | |
| 4042 | return 0; |
| 4043 | |
| 4044 | out_clear_reply: |
| 4045 | memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx))__builtin_memset((msg), (0), (sizeof(struct drm_dp_sideband_msg_rx ))); |
| 4046 | out: |
| 4047 | if (mstb) |
| 4048 | drm_dp_mst_topology_put_mstb(mstb); |
| 4049 | |
| 4050 | return 0; |
| 4051 | } |
| 4052 | |
| 4053 | static inline bool_Bool |
| 4054 | drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr *mgr, |
| 4055 | struct drm_dp_pending_up_req *up_req) |
| 4056 | { |
| 4057 | struct drm_dp_mst_branch *mstb = NULL((void *)0); |
| 4058 | struct drm_dp_sideband_msg_req_body *msg = &up_req->msg; |
| 4059 | struct drm_dp_sideband_msg_hdr *hdr = &up_req->hdr; |
| 4060 | bool_Bool hotplug = false0; |
| 4061 | |
| 4062 | if (hdr->broadcast) { |
| 4063 | const u8 *guid = NULL((void *)0); |
| 4064 | |
| 4065 | if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY0x02) |
| 4066 | guid = msg->u.conn_stat.guid; |
| 4067 | else if (msg->req_type == DP_RESOURCE_STATUS_NOTIFY0x13) |
| 4068 | guid = msg->u.resource_stat.guid; |
| 4069 | |
| 4070 | if (guid) |
| 4071 | mstb = drm_dp_get_mst_branch_device_by_guid(mgr, guid); |
| 4072 | } else { |
| 4073 | mstb = drm_dp_get_mst_branch_device(mgr, hdr->lct, hdr->rad); |
| 4074 | } |
| 4075 | |
| 4076 | if (!mstb) { |
| 4077 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n",__drm_dbg(DRM_UT_KMS, "Got MST reply from unknown device %d\n" , hdr->lct) |
| 4078 | hdr->lct)__drm_dbg(DRM_UT_KMS, "Got MST reply from unknown device %d\n" , hdr->lct); |
| 4079 | return false0; |
| 4080 | } |
| 4081 | |
| 4082 | /* TODO: Add missing handler for DP_RESOURCE_STATUS_NOTIFY events */ |
| 4083 | if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY0x02) { |
| 4084 | drm_dp_mst_handle_conn_stat(mstb, &msg->u.conn_stat); |
| 4085 | hotplug = true1; |
| 4086 | } |
| 4087 | |
| 4088 | drm_dp_mst_topology_put_mstb(mstb); |
| 4089 | return hotplug; |
| 4090 | } |
| 4091 | |
| 4092 | static void drm_dp_mst_up_req_work(struct work_struct *work) |
| 4093 | { |
| 4094 | struct drm_dp_mst_topology_mgr *mgr = |
| 4095 | container_of(work, struct drm_dp_mst_topology_mgr,({ const __typeof( ((struct drm_dp_mst_topology_mgr *)0)-> up_req_work ) *__mptr = (work); (struct drm_dp_mst_topology_mgr *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_topology_mgr , up_req_work) );}) |
| 4096 | up_req_work)({ const __typeof( ((struct drm_dp_mst_topology_mgr *)0)-> up_req_work ) *__mptr = (work); (struct drm_dp_mst_topology_mgr *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_topology_mgr , up_req_work) );}); |
| 4097 | struct drm_dp_pending_up_req *up_req; |
| 4098 | bool_Bool send_hotplug = false0; |
| 4099 | |
| 4100 | mutex_lock(&mgr->probe_lock)rw_enter_write(&mgr->probe_lock); |
| 4101 | while (true1) { |
| 4102 | mutex_lock(&mgr->up_req_lock)rw_enter_write(&mgr->up_req_lock); |
| 4103 | up_req = list_first_entry_or_null(&mgr->up_req_list,(list_empty(&mgr->up_req_list) ? ((void *)0) : ({ const __typeof( ((struct drm_dp_pending_up_req *)0)->next ) *__mptr = ((&mgr->up_req_list)->next); (struct drm_dp_pending_up_req *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_pending_up_req , next) );})) |
| 4104 | struct drm_dp_pending_up_req,(list_empty(&mgr->up_req_list) ? ((void *)0) : ({ const __typeof( ((struct drm_dp_pending_up_req *)0)->next ) *__mptr = ((&mgr->up_req_list)->next); (struct drm_dp_pending_up_req *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_pending_up_req , next) );})) |
| 4105 | next)(list_empty(&mgr->up_req_list) ? ((void *)0) : ({ const __typeof( ((struct drm_dp_pending_up_req *)0)->next ) *__mptr = ((&mgr->up_req_list)->next); (struct drm_dp_pending_up_req *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_pending_up_req , next) );})); |
| 4106 | if (up_req) |
| 4107 | list_del(&up_req->next); |
| 4108 | mutex_unlock(&mgr->up_req_lock)rw_exit_write(&mgr->up_req_lock); |
| 4109 | |
| 4110 | if (!up_req) |
| 4111 | break; |
| 4112 | |
| 4113 | send_hotplug |= drm_dp_mst_process_up_req(mgr, up_req); |
| 4114 | kfree(up_req); |
| 4115 | } |
| 4116 | mutex_unlock(&mgr->probe_lock)rw_exit_write(&mgr->probe_lock); |
| 4117 | |
| 4118 | if (send_hotplug) |
| 4119 | drm_kms_helper_hotplug_event(mgr->dev); |
| 4120 | } |
| 4121 | |
| 4122 | static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) |
| 4123 | { |
| 4124 | struct drm_dp_pending_up_req *up_req; |
| 4125 | |
| 4126 | if (!drm_dp_get_one_sb_msg(mgr, true1, NULL((void *)0))) |
| 4127 | goto out; |
| 4128 | |
| 4129 | if (!mgr->up_req_recv.have_eomt) |
| 4130 | return 0; |
| 4131 | |
| 4132 | up_req = kzalloc(sizeof(*up_req), GFP_KERNEL(0x0001 | 0x0004)); |
| 4133 | if (!up_req) { |
| 4134 | DRM_ERROR("Not enough memory to process MST up req\n")__drm_err("Not enough memory to process MST up req\n"); |
| 4135 | return -ENOMEM12; |
| 4136 | } |
| 4137 | INIT_LIST_HEAD(&up_req->next); |
| 4138 | |
| 4139 | drm_dp_sideband_parse_req(&mgr->up_req_recv, &up_req->msg); |
| 4140 | |
| 4141 | if (up_req->msg.req_type != DP_CONNECTION_STATUS_NOTIFY0x02 && |
| 4142 | up_req->msg.req_type != DP_RESOURCE_STATUS_NOTIFY0x13) { |
| 4143 | DRM_DEBUG_KMS("Received unknown up req type, ignoring: %x\n",__drm_dbg(DRM_UT_KMS, "Received unknown up req type, ignoring: %x\n" , up_req->msg.req_type) |
| 4144 | up_req->msg.req_type)__drm_dbg(DRM_UT_KMS, "Received unknown up req type, ignoring: %x\n" , up_req->msg.req_type); |
| 4145 | kfree(up_req); |
| 4146 | goto out; |
| 4147 | } |
| 4148 | |
| 4149 | drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, up_req->msg.req_type, |
| 4150 | false0); |
| 4151 | |
| 4152 | if (up_req->msg.req_type == DP_CONNECTION_STATUS_NOTIFY0x02) { |
| 4153 | const struct drm_dp_connection_status_notify *conn_stat = |
| 4154 | &up_req->msg.u.conn_stat; |
| 4155 | |
| 4156 | DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n",__drm_dbg(DRM_UT_KMS, "Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n" , conn_stat->port_number, conn_stat->legacy_device_plug_status , conn_stat->displayport_device_plug_status, conn_stat-> message_capability_status, conn_stat->input_port, conn_stat ->peer_device_type) |
| 4157 | conn_stat->port_number,__drm_dbg(DRM_UT_KMS, "Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n" , conn_stat->port_number, conn_stat->legacy_device_plug_status , conn_stat->displayport_device_plug_status, conn_stat-> message_capability_status, conn_stat->input_port, conn_stat ->peer_device_type) |
| 4158 | conn_stat->legacy_device_plug_status,__drm_dbg(DRM_UT_KMS, "Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n" , conn_stat->port_number, conn_stat->legacy_device_plug_status , conn_stat->displayport_device_plug_status, conn_stat-> message_capability_status, conn_stat->input_port, conn_stat ->peer_device_type) |
| 4159 | conn_stat->displayport_device_plug_status,__drm_dbg(DRM_UT_KMS, "Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n" , conn_stat->port_number, conn_stat->legacy_device_plug_status , conn_stat->displayport_device_plug_status, conn_stat-> message_capability_status, conn_stat->input_port, conn_stat ->peer_device_type) |
| 4160 | conn_stat->message_capability_status,__drm_dbg(DRM_UT_KMS, "Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n" , conn_stat->port_number, conn_stat->legacy_device_plug_status , conn_stat->displayport_device_plug_status, conn_stat-> message_capability_status, conn_stat->input_port, conn_stat ->peer_device_type) |
| 4161 | conn_stat->input_port,__drm_dbg(DRM_UT_KMS, "Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n" , conn_stat->port_number, conn_stat->legacy_device_plug_status , conn_stat->displayport_device_plug_status, conn_stat-> message_capability_status, conn_stat->input_port, conn_stat ->peer_device_type) |
| 4162 | conn_stat->peer_device_type)__drm_dbg(DRM_UT_KMS, "Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n" , conn_stat->port_number, conn_stat->legacy_device_plug_status , conn_stat->displayport_device_plug_status, conn_stat-> message_capability_status, conn_stat->input_port, conn_stat ->peer_device_type); |
| 4163 | } else if (up_req->msg.req_type == DP_RESOURCE_STATUS_NOTIFY0x13) { |
| 4164 | const struct drm_dp_resource_status_notify *res_stat = |
| 4165 | &up_req->msg.u.resource_stat; |
| 4166 | |
| 4167 | DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n",__drm_dbg(DRM_UT_KMS, "Got RSN: pn: %d avail_pbn %d\n", res_stat ->port_number, res_stat->available_pbn) |
| 4168 | res_stat->port_number,__drm_dbg(DRM_UT_KMS, "Got RSN: pn: %d avail_pbn %d\n", res_stat ->port_number, res_stat->available_pbn) |
| 4169 | res_stat->available_pbn)__drm_dbg(DRM_UT_KMS, "Got RSN: pn: %d avail_pbn %d\n", res_stat ->port_number, res_stat->available_pbn); |
| 4170 | } |
| 4171 | |
| 4172 | up_req->hdr = mgr->up_req_recv.initial_hdr; |
| 4173 | mutex_lock(&mgr->up_req_lock)rw_enter_write(&mgr->up_req_lock); |
| 4174 | list_add_tail(&up_req->next, &mgr->up_req_list); |
| 4175 | mutex_unlock(&mgr->up_req_lock)rw_exit_write(&mgr->up_req_lock); |
| 4176 | queue_work(system_long_wq, &mgr->up_req_work); |
| 4177 | |
| 4178 | out: |
| 4179 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx))__builtin_memset((&mgr->up_req_recv), (0), (sizeof(struct drm_dp_sideband_msg_rx))); |
| 4180 | return 0; |
| 4181 | } |
| 4182 | |
| 4183 | /** |
| 4184 | * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify |
| 4185 | * @mgr: manager to notify irq for. |
| 4186 | * @esi: 4 bytes from SINK_COUNT_ESI |
| 4187 | * @handled: whether the hpd interrupt was consumed or not |
| 4188 | * |
| 4189 | * This should be called from the driver when it detects a short IRQ, |
| 4190 | * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The |
| 4191 | * topology manager will process the sideband messages received as a result |
| 4192 | * of this. |
| 4193 | */ |
| 4194 | int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool_Bool *handled) |
| 4195 | { |
| 4196 | int ret = 0; |
| 4197 | int sc; |
| 4198 | *handled = false0; |
| 4199 | sc = esi[0] & 0x3f; |
| 4200 | |
| 4201 | if (sc != mgr->sink_count) { |
| 4202 | mgr->sink_count = sc; |
| 4203 | *handled = true1; |
| 4204 | } |
| 4205 | |
| 4206 | if (esi[1] & DP_DOWN_REP_MSG_RDY(1 << 4)) { |
| 4207 | ret = drm_dp_mst_handle_down_rep(mgr); |
| 4208 | *handled = true1; |
| 4209 | } |
| 4210 | |
| 4211 | if (esi[1] & DP_UP_REQ_MSG_RDY(1 << 5)) { |
| 4212 | ret |= drm_dp_mst_handle_up_req(mgr); |
| 4213 | *handled = true1; |
| 4214 | } |
| 4215 | |
| 4216 | drm_dp_mst_kick_tx(mgr); |
| 4217 | return ret; |
| 4218 | } |
| 4219 | EXPORT_SYMBOL(drm_dp_mst_hpd_irq); |
| 4220 | |
| 4221 | /** |
| 4222 | * drm_dp_mst_detect_port() - get connection status for an MST port |
| 4223 | * @connector: DRM connector for this port |
| 4224 | * @ctx: The acquisition context to use for grabbing locks |
| 4225 | * @mgr: manager for this port |
| 4226 | * @port: pointer to a port |
| 4227 | * |
| 4228 | * This returns the current connection state for a port. |
| 4229 | */ |
| 4230 | int |
| 4231 | drm_dp_mst_detect_port(struct drm_connector *connector, |
| 4232 | struct drm_modeset_acquire_ctx *ctx, |
| 4233 | struct drm_dp_mst_topology_mgr *mgr, |
| 4234 | struct drm_dp_mst_port *port) |
| 4235 | { |
| 4236 | int ret; |
| 4237 | |
| 4238 | /* we need to search for the port in the mgr in case it's gone */ |
| 4239 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
| 4240 | if (!port) |
| 4241 | return connector_status_disconnected; |
| 4242 | |
| 4243 | ret = drm_modeset_lock(&mgr->base.lock, ctx); |
| 4244 | if (ret) |
| 4245 | goto out; |
| 4246 | |
| 4247 | ret = connector_status_disconnected; |
| 4248 | |
| 4249 | if (!port->ddps) |
| 4250 | goto out; |
| 4251 | |
| 4252 | switch (port->pdt) { |
| 4253 | case DP_PEER_DEVICE_NONE0x0: |
| 4254 | break; |
| 4255 | case DP_PEER_DEVICE_MST_BRANCHING0x2: |
| 4256 | if (!port->mcs) |
| 4257 | ret = connector_status_connected; |
| 4258 | break; |
| 4259 | |
| 4260 | case DP_PEER_DEVICE_SST_SINK0x3: |
| 4261 | ret = connector_status_connected; |
| 4262 | /* for logical ports - cache the EDID */ |
| 4263 | if (port->port_num >= 8 && !port->cached_edid) { |
| 4264 | port->cached_edid = drm_get_edid(connector, &port->aux.ddc); |
| 4265 | } |
| 4266 | break; |
| 4267 | case DP_PEER_DEVICE_DP_LEGACY_CONV0x4: |
| 4268 | if (port->ldps) |
| 4269 | ret = connector_status_connected; |
| 4270 | break; |
| 4271 | } |
| 4272 | out: |
| 4273 | drm_dp_mst_topology_put_port(port); |
| 4274 | return ret; |
| 4275 | } |
| 4276 | EXPORT_SYMBOL(drm_dp_mst_detect_port); |
| 4277 | |
| 4278 | /** |
| 4279 | * drm_dp_mst_get_edid() - get EDID for an MST port |
| 4280 | * @connector: toplevel connector to get EDID for |
| 4281 | * @mgr: manager for this port |
| 4282 | * @port: unverified pointer to a port. |
| 4283 | * |
| 4284 | * This returns an EDID for the port connected to a connector, |
| 4285 | * It validates the pointer still exists so the caller doesn't require a |
| 4286 | * reference. |
| 4287 | */ |
| 4288 | struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
| 4289 | { |
| 4290 | struct edid *edid = NULL((void *)0); |
| 4291 | |
| 4292 | /* we need to search for the port in the mgr in case it's gone */ |
| 4293 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
| 4294 | if (!port) |
| 4295 | return NULL((void *)0); |
| 4296 | |
| 4297 | if (port->cached_edid) |
| 4298 | edid = drm_edid_duplicate(port->cached_edid); |
| 4299 | else { |
| 4300 | edid = drm_get_edid(connector, &port->aux.ddc); |
| 4301 | } |
| 4302 | port->has_audio = drm_detect_monitor_audio(edid); |
| 4303 | drm_dp_mst_topology_put_port(port); |
| 4304 | return edid; |
| 4305 | } |
| 4306 | EXPORT_SYMBOL(drm_dp_mst_get_edid); |
| 4307 | |
| 4308 | /** |
| 4309 | * drm_dp_find_vcpi_slots() - Find VCPI slots for this PBN value |
| 4310 | * @mgr: manager to use |
| 4311 | * @pbn: payload bandwidth to convert into slots. |
| 4312 | * |
| 4313 | * Calculate the number of VCPI slots that will be required for the given PBN |
| 4314 | * value. This function is deprecated, and should not be used in atomic |
| 4315 | * drivers. |
| 4316 | * |
| 4317 | * RETURNS: |
| 4318 | * The total slots required for this port, or error. |
| 4319 | */ |
| 4320 | int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, |
| 4321 | int pbn) |
| 4322 | { |
| 4323 | int num_slots; |
| 4324 | |
| 4325 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div)(((pbn) + ((mgr->pbn_div) - 1)) / (mgr->pbn_div)); |
| 4326 | |
| 4327 | /* max. time slots - one slot for MTP header */ |
| 4328 | if (num_slots > 63) |
| 4329 | return -ENOSPC28; |
| 4330 | return num_slots; |
| 4331 | } |
| 4332 | EXPORT_SYMBOL(drm_dp_find_vcpi_slots); |
| 4333 | |
| 4334 | static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, |
| 4335 | struct drm_dp_vcpi *vcpi, int pbn, int slots) |
| 4336 | { |
| 4337 | int ret; |
| 4338 | |
| 4339 | /* max. time slots - one slot for MTP header */ |
| 4340 | if (slots > 63) |
| 4341 | return -ENOSPC28; |
| 4342 | |
| 4343 | vcpi->pbn = pbn; |
| 4344 | vcpi->aligned_pbn = slots * mgr->pbn_div; |
| 4345 | vcpi->num_slots = slots; |
| 4346 | |
| 4347 | ret = drm_dp_mst_assign_payload_id(mgr, vcpi); |
| 4348 | if (ret < 0) |
| 4349 | return ret; |
| 4350 | return 0; |
| 4351 | } |
| 4352 | |
| 4353 | /** |
| 4354 | * drm_dp_atomic_find_vcpi_slots() - Find and add VCPI slots to the state |
| 4355 | * @state: global atomic state |
| 4356 | * @mgr: MST topology manager for the port |
| 4357 | * @port: port to find vcpi slots for |
| 4358 | * @pbn: bandwidth required for the mode in PBN |
| 4359 | * @pbn_div: divider for DSC mode that takes FEC into account |
| 4360 | * |
| 4361 | * Allocates VCPI slots to @port, replacing any previous VCPI allocations it |
| 4362 | * may have had. Any atomic drivers which support MST must call this function |
| 4363 | * in their &drm_encoder_helper_funcs.atomic_check() callback to change the |
| 4364 | * current VCPI allocation for the new state, but only when |
| 4365 | * &drm_crtc_state.mode_changed or &drm_crtc_state.connectors_changed is set |
| 4366 | * to ensure compatibility with userspace applications that still use the |
| 4367 | * legacy modesetting UAPI. |
| 4368 | * |
| 4369 | * Allocations set by this function are not checked against the bandwidth |
| 4370 | * restraints of @mgr until the driver calls drm_dp_mst_atomic_check(). |
| 4371 | * |
| 4372 | * Additionally, it is OK to call this function multiple times on the same |
| 4373 | * @port as needed. It is not OK however, to call this function and |
| 4374 | * drm_dp_atomic_release_vcpi_slots() in the same atomic check phase. |
| 4375 | * |
| 4376 | * See also: |
| 4377 | * drm_dp_atomic_release_vcpi_slots() |
| 4378 | * drm_dp_mst_atomic_check() |
| 4379 | * |
| 4380 | * Returns: |
| 4381 | * Total slots in the atomic state assigned for this port, or a negative error |
| 4382 | * code if the port no longer exists |
| 4383 | */ |
| 4384 | int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state, |
| 4385 | struct drm_dp_mst_topology_mgr *mgr, |
| 4386 | struct drm_dp_mst_port *port, int pbn, |
| 4387 | int pbn_div) |
| 4388 | { |
| 4389 | struct drm_dp_mst_topology_state *topology_state; |
| 4390 | struct drm_dp_vcpi_allocation *pos, *vcpi = NULL((void *)0); |
| 4391 | int prev_slots, prev_bw, req_slots; |
| 4392 | |
| 4393 | topology_state = drm_atomic_get_mst_topology_state(state, mgr); |
| 4394 | if (IS_ERR(topology_state)) |
| 4395 | return PTR_ERR(topology_state); |
| 4396 | |
| 4397 | /* Find the current allocation for this port, if any */ |
| 4398 | list_for_each_entry(pos, &topology_state->vcpis, next)for (pos = ({ const __typeof( ((__typeof(*pos) *)0)->next ) *__mptr = ((&topology_state->vcpis)->next); (__typeof (*pos) *)( (char *)__mptr - __builtin_offsetof(__typeof(*pos) , next) );}); &pos->next != (&topology_state->vcpis ); pos = ({ const __typeof( ((__typeof(*pos) *)0)->next ) * __mptr = (pos->next.next); (__typeof(*pos) *)( (char *)__mptr - __builtin_offsetof(__typeof(*pos), next) );})) { |
| 4399 | if (pos->port == port) { |
| 4400 | vcpi = pos; |
| 4401 | prev_slots = vcpi->vcpi; |
| 4402 | prev_bw = vcpi->pbn; |
| 4403 | |
| 4404 | /* |
| 4405 | * This should never happen, unless the driver tries |
| 4406 | * releasing and allocating the same VCPI allocation, |
| 4407 | * which is an error |
| 4408 | */ |
| 4409 | if (WARN_ON(!prev_slots)({ int __ret = !!(!prev_slots); if (__ret) printf("WARNING %s failed at %s:%d\n" , "!prev_slots", "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c" , 4409); __builtin_expect(!!(__ret), 0); })) { |
| 4410 | DRM_ERROR("cannot allocate and release VCPI on [MST PORT:%p] in the same state\n",__drm_err("cannot allocate and release VCPI on [MST PORT:%p] in the same state\n" , port) |
| 4411 | port)__drm_err("cannot allocate and release VCPI on [MST PORT:%p] in the same state\n" , port); |
| 4412 | return -EINVAL22; |
| 4413 | } |
| 4414 | |
| 4415 | break; |
| 4416 | } |
| 4417 | } |
| 4418 | if (!vcpi) { |
| 4419 | prev_slots = 0; |
| 4420 | prev_bw = 0; |
| 4421 | } |
| 4422 | |
| 4423 | if (pbn_div <= 0) |
| 4424 | pbn_div = mgr->pbn_div; |
| 4425 | |
| 4426 | req_slots = DIV_ROUND_UP(pbn, pbn_div)(((pbn) + ((pbn_div) - 1)) / (pbn_div)); |
| 4427 | |
| 4428 | DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] [MST PORT:%p] VCPI %d -> %d\n",__drm_dbg(DRM_UT_ATOMIC, "[CONNECTOR:%d:%s] [MST PORT:%p] VCPI %d -> %d\n" , port->connector->base.id, port->connector->name , port, prev_slots, req_slots) |
| 4429 | port->connector->base.id, port->connector->name,__drm_dbg(DRM_UT_ATOMIC, "[CONNECTOR:%d:%s] [MST PORT:%p] VCPI %d -> %d\n" , port->connector->base.id, port->connector->name , port, prev_slots, req_slots) |
| 4430 | port, prev_slots, req_slots)__drm_dbg(DRM_UT_ATOMIC, "[CONNECTOR:%d:%s] [MST PORT:%p] VCPI %d -> %d\n" , port->connector->base.id, port->connector->name , port, prev_slots, req_slots); |
| 4431 | DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] [MST PORT:%p] PBN %d -> %d\n",__drm_dbg(DRM_UT_ATOMIC, "[CONNECTOR:%d:%s] [MST PORT:%p] PBN %d -> %d\n" , port->connector->base.id, port->connector->name , port, prev_bw, pbn) |
| 4432 | port->connector->base.id, port->connector->name,__drm_dbg(DRM_UT_ATOMIC, "[CONNECTOR:%d:%s] [MST PORT:%p] PBN %d -> %d\n" , port->connector->base.id, port->connector->name , port, prev_bw, pbn) |
| 4433 | port, prev_bw, pbn)__drm_dbg(DRM_UT_ATOMIC, "[CONNECTOR:%d:%s] [MST PORT:%p] PBN %d -> %d\n" , port->connector->base.id, port->connector->name , port, prev_bw, pbn); |
| 4434 | |
| 4435 | /* Add the new allocation to the state */ |
| 4436 | if (!vcpi) { |
| 4437 | vcpi = kzalloc(sizeof(*vcpi), GFP_KERNEL(0x0001 | 0x0004)); |
| 4438 | if (!vcpi) |
| 4439 | return -ENOMEM12; |
| 4440 | |
| 4441 | drm_dp_mst_get_port_malloc(port); |
| 4442 | vcpi->port = port; |
| 4443 | list_add(&vcpi->next, &topology_state->vcpis); |
| 4444 | } |
| 4445 | vcpi->vcpi = req_slots; |
| 4446 | vcpi->pbn = pbn; |
| 4447 | |
| 4448 | return req_slots; |
| 4449 | } |
| 4450 | EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots); |
| 4451 | |
| 4452 | /** |
| 4453 | * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots |
| 4454 | * @state: global atomic state |
| 4455 | * @mgr: MST topology manager for the port |
| 4456 | * @port: The port to release the VCPI slots from |
| 4457 | * |
| 4458 | * Releases any VCPI slots that have been allocated to a port in the atomic |
| 4459 | * state. Any atomic drivers which support MST must call this function in |
| 4460 | * their &drm_connector_helper_funcs.atomic_check() callback when the |
| 4461 | * connector will no longer have VCPI allocated (e.g. because its CRTC was |
| 4462 | * removed) when it had VCPI allocated in the previous atomic state. |
| 4463 | * |
| 4464 | * It is OK to call this even if @port has been removed from the system. |
| 4465 | * Additionally, it is OK to call this function multiple times on the same |
| 4466 | * @port as needed. It is not OK however, to call this function and |
| 4467 | * drm_dp_atomic_find_vcpi_slots() on the same @port in a single atomic check |
| 4468 | * phase. |
| 4469 | * |
| 4470 | * See also: |
| 4471 | * drm_dp_atomic_find_vcpi_slots() |
| 4472 | * drm_dp_mst_atomic_check() |
| 4473 | * |
| 4474 | * Returns: |
| 4475 | * 0 if all slots for this port were added back to |
| 4476 | * &drm_dp_mst_topology_state.avail_slots or negative error code |
| 4477 | */ |
| 4478 | int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state, |
| 4479 | struct drm_dp_mst_topology_mgr *mgr, |
| 4480 | struct drm_dp_mst_port *port) |
| 4481 | { |
| 4482 | struct drm_dp_mst_topology_state *topology_state; |
| 4483 | struct drm_dp_vcpi_allocation *pos; |
| 4484 | bool_Bool found = false0; |
| 4485 | |
| 4486 | topology_state = drm_atomic_get_mst_topology_state(state, mgr); |
| 4487 | if (IS_ERR(topology_state)) |
| 4488 | return PTR_ERR(topology_state); |
| 4489 | |
| 4490 | list_for_each_entry(pos, &topology_state->vcpis, next)for (pos = ({ const __typeof( ((__typeof(*pos) *)0)->next ) *__mptr = ((&topology_state->vcpis)->next); (__typeof (*pos) *)( (char *)__mptr - __builtin_offsetof(__typeof(*pos) , next) );}); &pos->next != (&topology_state->vcpis ); pos = ({ const __typeof( ((__typeof(*pos) *)0)->next ) * __mptr = (pos->next.next); (__typeof(*pos) *)( (char *)__mptr - __builtin_offsetof(__typeof(*pos), next) );})) { |
| 4491 | if (pos->port == port) { |
| 4492 | found = true1; |
| 4493 | break; |
| 4494 | } |
| 4495 | } |
| 4496 | if (WARN_ON(!found)({ int __ret = !!(!found); if (__ret) printf("WARNING %s failed at %s:%d\n" , "!found", "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c", 4496); __builtin_expect(!!(__ret), 0); })) { |
| 4497 | DRM_ERROR("no VCPI for [MST PORT:%p] found in mst state %p\n",__drm_err("no VCPI for [MST PORT:%p] found in mst state %p\n" , port, &topology_state->base) |
| 4498 | port, &topology_state->base)__drm_err("no VCPI for [MST PORT:%p] found in mst state %p\n" , port, &topology_state->base); |
| 4499 | return -EINVAL22; |
| 4500 | } |
| 4501 | |
| 4502 | DRM_DEBUG_ATOMIC("[MST PORT:%p] VCPI %d -> 0\n", port, pos->vcpi)__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] VCPI %d -> 0\n", port , pos->vcpi); |
| 4503 | if (pos->vcpi) { |
| 4504 | drm_dp_mst_put_port_malloc(port); |
| 4505 | pos->vcpi = 0; |
| 4506 | pos->pbn = 0; |
| 4507 | } |
| 4508 | |
| 4509 | return 0; |
| 4510 | } |
| 4511 | EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots); |
| 4512 | |
| 4513 | /** |
| 4514 | * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel |
| 4515 | * @mgr: manager for this port |
| 4516 | * @port: port to allocate a virtual channel for. |
| 4517 | * @pbn: payload bandwidth number to request |
| 4518 | * @slots: returned number of slots for this PBN. |
| 4519 | */ |
| 4520 | bool_Bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, |
| 4521 | struct drm_dp_mst_port *port, int pbn, int slots) |
| 4522 | { |
| 4523 | int ret; |
| 4524 | |
| 4525 | if (slots < 0) |
| 4526 | return false0; |
| 4527 | |
| 4528 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
| 4529 | if (!port) |
| 4530 | return false0; |
| 4531 | |
| 4532 | if (port->vcpi.vcpi > 0) { |
| 4533 | DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n",__drm_dbg(DRM_UT_KMS, "payload: vcpi %d already allocated for pbn %d - requested pbn %d\n" , port->vcpi.vcpi, port->vcpi.pbn, pbn) |
| 4534 | port->vcpi.vcpi, port->vcpi.pbn, pbn)__drm_dbg(DRM_UT_KMS, "payload: vcpi %d already allocated for pbn %d - requested pbn %d\n" , port->vcpi.vcpi, port->vcpi.pbn, pbn); |
| 4535 | if (pbn == port->vcpi.pbn) { |
| 4536 | drm_dp_mst_topology_put_port(port); |
| 4537 | return true1; |
| 4538 | } |
| 4539 | } |
| 4540 | |
| 4541 | ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots); |
| 4542 | if (ret) { |
| 4543 | DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n",__drm_dbg(DRM_UT_KMS, "failed to init vcpi slots=%d max=63 ret=%d\n" , (((pbn) + ((mgr->pbn_div) - 1)) / (mgr->pbn_div)), ret ) |
| 4544 | DIV_ROUND_UP(pbn, mgr->pbn_div), ret)__drm_dbg(DRM_UT_KMS, "failed to init vcpi slots=%d max=63 ret=%d\n" , (((pbn) + ((mgr->pbn_div) - 1)) / (mgr->pbn_div)), ret ); |
| 4545 | drm_dp_mst_topology_put_port(port); |
| 4546 | goto out; |
| 4547 | } |
| 4548 | DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n",__drm_dbg(DRM_UT_KMS, "initing vcpi for pbn=%d slots=%d\n", pbn , port->vcpi.num_slots) |
| 4549 | pbn, port->vcpi.num_slots)__drm_dbg(DRM_UT_KMS, "initing vcpi for pbn=%d slots=%d\n", pbn , port->vcpi.num_slots); |
| 4550 | |
| 4551 | /* Keep port allocated until its payload has been removed */ |
| 4552 | drm_dp_mst_get_port_malloc(port); |
| 4553 | drm_dp_mst_topology_put_port(port); |
| 4554 | return true1; |
| 4555 | out: |
| 4556 | return false0; |
| 4557 | } |
| 4558 | EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); |
| 4559 | |
| 4560 | int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
| 4561 | { |
| 4562 | int slots = 0; |
| 4563 | |
| 4564 | port = drm_dp_mst_topology_get_port_validated(mgr, port); |
| 4565 | if (!port) |
| 4566 | return slots; |
| 4567 | |
| 4568 | slots = port->vcpi.num_slots; |
| 4569 | drm_dp_mst_topology_put_port(port); |
| 4570 | return slots; |
| 4571 | } |
| 4572 | EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots); |
| 4573 | |
| 4574 | /** |
| 4575 | * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI |
| 4576 | * @mgr: manager for this port |
| 4577 | * @port: unverified pointer to a port. |
| 4578 | * |
| 4579 | * This just resets the number of slots for the ports VCPI for later programming. |
| 4580 | */ |
| 4581 | void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
| 4582 | { |
| 4583 | /* |
| 4584 | * A port with VCPI will remain allocated until its VCPI is |
| 4585 | * released, no verified ref needed |
| 4586 | */ |
| 4587 | |
| 4588 | port->vcpi.num_slots = 0; |
| 4589 | } |
| 4590 | EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); |
| 4591 | |
| 4592 | /** |
| 4593 | * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI |
| 4594 | * @mgr: manager for this port |
| 4595 | * @port: port to deallocate vcpi for |
| 4596 | * |
| 4597 | * This can be called unconditionally, regardless of whether |
| 4598 | * drm_dp_mst_allocate_vcpi() succeeded or not. |
| 4599 | */ |
| 4600 | void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, |
| 4601 | struct drm_dp_mst_port *port) |
| 4602 | { |
| 4603 | bool_Bool skip; |
| 4604 | |
| 4605 | if (!port->vcpi.vcpi) |
| 4606 | return; |
| 4607 | |
| 4608 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 4609 | skip = !drm_dp_mst_port_downstream_of_branch(port, mgr->mst_primary); |
| 4610 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 4611 | |
| 4612 | if (skip) |
| 4613 | return; |
| 4614 | |
| 4615 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); |
| 4616 | port->vcpi.num_slots = 0; |
| 4617 | port->vcpi.pbn = 0; |
| 4618 | port->vcpi.aligned_pbn = 0; |
| 4619 | port->vcpi.vcpi = 0; |
| 4620 | drm_dp_mst_put_port_malloc(port); |
| 4621 | } |
| 4622 | EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); |
| 4623 | |
| 4624 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, |
| 4625 | int id, struct drm_dp_payload *payload) |
| 4626 | { |
| 4627 | u8 payload_alloc[3], status; |
| 4628 | int ret; |
| 4629 | int retries = 0; |
| 4630 | |
| 4631 | drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS0x2c0, |
| 4632 | DP_PAYLOAD_TABLE_UPDATED(1 << 0)); |
| 4633 | |
| 4634 | payload_alloc[0] = id; |
| 4635 | payload_alloc[1] = payload->start_slot; |
| 4636 | payload_alloc[2] = payload->num_slots; |
| 4637 | |
| 4638 | ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET0x1c0, payload_alloc, 3); |
| 4639 | if (ret != 3) { |
| 4640 | DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret)__drm_dbg(DRM_UT_KMS, "failed to write payload allocation %d\n" , ret); |
| 4641 | goto fail; |
| 4642 | } |
| 4643 | |
| 4644 | retry: |
| 4645 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS0x2c0, &status); |
| 4646 | if (ret < 0) { |
| 4647 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret)__drm_dbg(DRM_UT_KMS, "failed to read payload table status %d\n" , ret); |
| 4648 | goto fail; |
| 4649 | } |
| 4650 | |
| 4651 | if (!(status & DP_PAYLOAD_TABLE_UPDATED(1 << 0))) { |
| 4652 | retries++; |
| 4653 | if (retries < 20) { |
| 4654 | usleep_range(10000, 20000); |
| 4655 | goto retry; |
| 4656 | } |
| 4657 | DRM_DEBUG_KMS("status not set after read payload table status %d\n", status)__drm_dbg(DRM_UT_KMS, "status not set after read payload table status %d\n" , status); |
| 4658 | ret = -EINVAL22; |
| 4659 | goto fail; |
| 4660 | } |
| 4661 | ret = 0; |
| 4662 | fail: |
| 4663 | return ret; |
| 4664 | } |
| 4665 | |
| 4666 | static int do_get_act_status(struct drm_dp_aux *aux) |
| 4667 | { |
| 4668 | int ret; |
| 4669 | u8 status; |
| 4670 | |
| 4671 | ret = drm_dp_dpcd_readb(aux, DP_PAYLOAD_TABLE_UPDATE_STATUS0x2c0, &status); |
| 4672 | if (ret < 0) |
| 4673 | return ret; |
| 4674 | |
| 4675 | return status; |
| 4676 | } |
| 4677 | |
| 4678 | /** |
| 4679 | * drm_dp_check_act_status() - Polls for ACT handled status. |
| 4680 | * @mgr: manager to use |
| 4681 | * |
| 4682 | * Tries waiting for the MST hub to finish updating it's payload table by |
| 4683 | * polling for the ACT handled bit for up to 3 seconds (yes-some hubs really |
| 4684 | * take that long). |
| 4685 | * |
| 4686 | * Returns: |
| 4687 | * 0 if the ACT was handled in time, negative error code on failure. |
| 4688 | */ |
| 4689 | int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) |
| 4690 | { |
| 4691 | /* |
| 4692 | * There doesn't seem to be any recommended retry count or timeout in |
| 4693 | * the MST specification. Since some hubs have been observed to take |
| 4694 | * over 1 second to update their payload allocations under certain |
| 4695 | * conditions, we use a rather large timeout value. |
| 4696 | */ |
| 4697 | const int timeout_ms = 3000; |
| 4698 | int ret, status; |
| 4699 | |
| 4700 | ret = readx_poll_timeout(do_get_act_status, mgr->aux, status,({ struct timeval __end, __now, __timeout_tv; int __timed_out = 0; if (timeout_ms * 1000L) { microuptime(&__now); USEC_TO_TIMEVAL (timeout_ms * 1000L, &__timeout_tv); do { (&__end)-> tv_sec = (&__now)->tv_sec + (&__timeout_tv)->tv_sec ; (&__end)->tv_usec = (&__now)->tv_usec + (& __timeout_tv)->tv_usec; if ((&__end)->tv_usec >= 1000000) { (&__end)->tv_sec++; (&__end)->tv_usec -= 1000000; } } while (0); } for (;;) { (status) = (do_get_act_status )(mgr->aux); if (status & (1 << 1) || status < 0) break; if (timeout_ms * 1000L) { microuptime(&__now); if ((((&__end)->tv_sec == (&__now)->tv_sec) ? ( (&__end)->tv_usec <= (&__now)->tv_usec) : (( &__end)->tv_sec <= (&__now)->tv_sec))) { __timed_out = 1; break; } } if (200) (*delay_func)((200) / 2); } (__timed_out ) ? -60 : 0; }) |
| 4701 | status & DP_PAYLOAD_ACT_HANDLED || status < 0,({ struct timeval __end, __now, __timeout_tv; int __timed_out = 0; if (timeout_ms * 1000L) { microuptime(&__now); USEC_TO_TIMEVAL (timeout_ms * 1000L, &__timeout_tv); do { (&__end)-> tv_sec = (&__now)->tv_sec + (&__timeout_tv)->tv_sec ; (&__end)->tv_usec = (&__now)->tv_usec + (& __timeout_tv)->tv_usec; if ((&__end)->tv_usec >= 1000000) { (&__end)->tv_sec++; (&__end)->tv_usec -= 1000000; } } while (0); } for (;;) { (status) = (do_get_act_status )(mgr->aux); if (status & (1 << 1) || status < 0) break; if (timeout_ms * 1000L) { microuptime(&__now); if ((((&__end)->tv_sec == (&__now)->tv_sec) ? ( (&__end)->tv_usec <= (&__now)->tv_usec) : (( &__end)->tv_sec <= (&__now)->tv_sec))) { __timed_out = 1; break; } } if (200) (*delay_func)((200) / 2); } (__timed_out ) ? -60 : 0; }) |
| 4702 | 200, timeout_ms * USEC_PER_MSEC)({ struct timeval __end, __now, __timeout_tv; int __timed_out = 0; if (timeout_ms * 1000L) { microuptime(&__now); USEC_TO_TIMEVAL (timeout_ms * 1000L, &__timeout_tv); do { (&__end)-> tv_sec = (&__now)->tv_sec + (&__timeout_tv)->tv_sec ; (&__end)->tv_usec = (&__now)->tv_usec + (& __timeout_tv)->tv_usec; if ((&__end)->tv_usec >= 1000000) { (&__end)->tv_sec++; (&__end)->tv_usec -= 1000000; } } while (0); } for (;;) { (status) = (do_get_act_status )(mgr->aux); if (status & (1 << 1) || status < 0) break; if (timeout_ms * 1000L) { microuptime(&__now); if ((((&__end)->tv_sec == (&__now)->tv_sec) ? ( (&__end)->tv_usec <= (&__now)->tv_usec) : (( &__end)->tv_sec <= (&__now)->tv_sec))) { __timed_out = 1; break; } } if (200) (*delay_func)((200) / 2); } (__timed_out ) ? -60 : 0; }); |
| 4703 | if (ret < 0 && status >= 0) { |
| 4704 | DRM_ERROR("Failed to get ACT after %dms, last status: %02x\n",__drm_err("Failed to get ACT after %dms, last status: %02x\n" , timeout_ms, status) |
| 4705 | timeout_ms, status)__drm_err("Failed to get ACT after %dms, last status: %02x\n" , timeout_ms, status); |
| 4706 | return -EINVAL22; |
| 4707 | } else if (status < 0) { |
| 4708 | /* |
| 4709 | * Failure here isn't unexpected - the hub may have |
| 4710 | * just been unplugged |
| 4711 | */ |
| 4712 | DRM_DEBUG_KMS("Failed to read payload table status: %d\n",__drm_dbg(DRM_UT_KMS, "Failed to read payload table status: %d\n" , status) |
| 4713 | status)__drm_dbg(DRM_UT_KMS, "Failed to read payload table status: %d\n" , status); |
| 4714 | return status; |
| 4715 | } |
| 4716 | |
| 4717 | return 0; |
| 4718 | } |
| 4719 | EXPORT_SYMBOL(drm_dp_check_act_status); |
| 4720 | |
| 4721 | /** |
| 4722 | * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. |
| 4723 | * @clock: dot clock for the mode |
| 4724 | * @bpp: bpp for the mode. |
| 4725 | * @dsc: DSC mode. If true, bpp has units of 1/16 of a bit per pixel |
| 4726 | * |
| 4727 | * This uses the formula in the spec to calculate the PBN value for a mode. |
| 4728 | */ |
| 4729 | int drm_dp_calc_pbn_mode(int clock, int bpp, bool_Bool dsc) |
| 4730 | { |
| 4731 | /* |
| 4732 | * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006 |
| 4733 | * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on |
| 4734 | * common multiplier to render an integer PBN for all link rate/lane |
| 4735 | * counts combinations |
| 4736 | * calculate |
| 4737 | * peak_kbps *= (1006/1000) |
| 4738 | * peak_kbps *= (64/54) |
| 4739 | * peak_kbps *= 8 convert to bytes |
| 4740 | * |
| 4741 | * If the bpp is in units of 1/16, further divide by 16. Put this |
| 4742 | * factor in the numerator rather than the denominator to avoid |
| 4743 | * integer overflow |
| 4744 | */ |
| 4745 | |
| 4746 | if (dsc) |
| 4747 | return DIV_ROUND_UP_ULL(mul_u32_u32(clock * (bpp / 16), 64 * 1006),(((mul_u32_u32(clock * (bpp / 16), 64 * 1006)) + ((8 * 54 * 1000 * 1000) - 1)) / (8 * 54 * 1000 * 1000)) |
| 4748 | 8 * 54 * 1000 * 1000)(((mul_u32_u32(clock * (bpp / 16), 64 * 1006)) + ((8 * 54 * 1000 * 1000) - 1)) / (8 * 54 * 1000 * 1000)); |
| 4749 | |
| 4750 | return DIV_ROUND_UP_ULL(mul_u32_u32(clock * bpp, 64 * 1006),(((mul_u32_u32(clock * bpp, 64 * 1006)) + ((8 * 54 * 1000 * 1000 ) - 1)) / (8 * 54 * 1000 * 1000)) |
| 4751 | 8 * 54 * 1000 * 1000)(((mul_u32_u32(clock * bpp, 64 * 1006)) + ((8 * 54 * 1000 * 1000 ) - 1)) / (8 * 54 * 1000 * 1000)); |
| 4752 | } |
| 4753 | EXPORT_SYMBOL(drm_dp_calc_pbn_mode); |
| 4754 | |
| 4755 | /* we want to kick the TX after we've ack the up/down IRQs. */ |
| 4756 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) |
| 4757 | { |
| 4758 | queue_work(system_long_wq, &mgr->tx_work); |
| 4759 | } |
| 4760 | |
| 4761 | static void drm_dp_mst_dump_mstb(struct seq_file *m, |
| 4762 | struct drm_dp_mst_branch *mstb) |
| 4763 | { |
| 4764 | struct drm_dp_mst_port *port; |
| 4765 | int tabs = mstb->lct; |
| 4766 | char prefix[10]; |
| 4767 | int i; |
| 4768 | |
| 4769 | for (i = 0; i < tabs; i++) |
| 4770 | prefix[i] = '\t'; |
| 4771 | prefix[i] = '\0'; |
| 4772 | |
| 4773 | seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); |
| 4774 | list_for_each_entry(port, &mstb->ports, next)for (port = ({ const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = ((&mstb->ports)->next); (__typeof(*port ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*port), next ) );}); &port->next != (&mstb->ports); port = ( { const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = (port->next.next); (__typeof(*port) *)( (char *)__mptr - __builtin_offsetof (__typeof(*port), next) );})) { |
| 4775 | seq_printf(m, "%sport: %d: input: %d: pdt: %d, ddps: %d ldps: %d, sdp: %d/%d, %p, conn: %p\n", prefix, port->port_num, port->input, port->pdt, port->ddps, port->ldps, port->num_sdp_streams, port->num_sdp_stream_sinks, port, port->connector); |
| 4776 | if (port->mstb) |
| 4777 | drm_dp_mst_dump_mstb(m, port->mstb); |
| 4778 | } |
| 4779 | } |
| 4780 | |
| 4781 | #define DP_PAYLOAD_TABLE_SIZE64 64 |
| 4782 | |
| 4783 | static bool_Bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
| 4784 | char *buf) |
| 4785 | { |
| 4786 | int i; |
| 4787 | |
| 4788 | for (i = 0; i < DP_PAYLOAD_TABLE_SIZE64; i += 16) { |
| 4789 | if (drm_dp_dpcd_read(mgr->aux, |
| 4790 | DP_PAYLOAD_TABLE_UPDATE_STATUS0x2c0 + i, |
| 4791 | &buf[i], 16) != 16) |
| 4792 | return false0; |
| 4793 | } |
| 4794 | return true1; |
| 4795 | } |
| 4796 | |
| 4797 | static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr, |
| 4798 | struct drm_dp_mst_port *port, char *name, |
| 4799 | int namelen) |
| 4800 | { |
| 4801 | struct edid *mst_edid; |
| 4802 | |
| 4803 | mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port); |
| 4804 | drm_edid_get_monitor_name(mst_edid, name, namelen); |
| 4805 | } |
| 4806 | |
| 4807 | /** |
| 4808 | * drm_dp_mst_dump_topology(): dump topology to seq file. |
| 4809 | * @m: seq_file to dump output to |
| 4810 | * @mgr: manager to dump current topology for. |
| 4811 | * |
| 4812 | * helper to dump MST topology to a seq file for debugfs. |
| 4813 | */ |
| 4814 | void drm_dp_mst_dump_topology(struct seq_file *m, |
| 4815 | struct drm_dp_mst_topology_mgr *mgr) |
| 4816 | { |
| 4817 | int i; |
| 4818 | struct drm_dp_mst_port *port; |
| 4819 | |
| 4820 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 4821 | if (mgr->mst_primary) |
| 4822 | drm_dp_mst_dump_mstb(m, mgr->mst_primary); |
| 4823 | |
| 4824 | /* dump VCPIs */ |
| 4825 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 4826 | |
| 4827 | mutex_lock(&mgr->payload_lock)rw_enter_write(&mgr->payload_lock); |
| 4828 | seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask, |
| 4829 | mgr->max_payloads); |
| 4830 | |
| 4831 | for (i = 0; i < mgr->max_payloads; i++) { |
| 4832 | if (mgr->proposed_vcpis[i]) { |
| 4833 | char name[14]; |
| 4834 | |
| 4835 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi)({ const __typeof( ((struct drm_dp_mst_port *)0)->vcpi ) * __mptr = (mgr->proposed_vcpis[i]); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_port , vcpi) );}); |
| 4836 | fetch_monitor_name(mgr, port, name, sizeof(name)); |
| 4837 | seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i, |
| 4838 | port->port_num, port->vcpi.vcpi, |
| 4839 | port->vcpi.num_slots, |
| 4840 | (*name != 0) ? name : "Unknown"); |
| 4841 | } else |
| 4842 | seq_printf(m, "vcpi %d:unused\n", i); |
| 4843 | } |
| 4844 | for (i = 0; i < mgr->max_payloads; i++) { |
| 4845 | seq_printf(m, "payload %d: %d, %d, %d\n", |
| 4846 | i, |
| 4847 | mgr->payloads[i].payload_state, |
| 4848 | mgr->payloads[i].start_slot, |
| 4849 | mgr->payloads[i].num_slots); |
| 4850 | |
| 4851 | |
| 4852 | } |
| 4853 | mutex_unlock(&mgr->payload_lock)rw_exit_write(&mgr->payload_lock); |
| 4854 | |
| 4855 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 4856 | if (mgr->mst_primary) { |
| 4857 | u8 buf[DP_PAYLOAD_TABLE_SIZE64]; |
| 4858 | int ret; |
| 4859 | |
| 4860 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV0x000, buf, DP_RECEIVER_CAP_SIZE0xf); |
| 4861 | if (ret) { |
| 4862 | seq_printf(m, "dpcd read failed\n"); |
| 4863 | goto out; |
| 4864 | } |
| 4865 | seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE0xf, buf); |
| 4866 | |
| 4867 | ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP0x020, buf, 2); |
| 4868 | if (ret) { |
| 4869 | seq_printf(m, "faux/mst read failed\n"); |
| 4870 | goto out; |
| 4871 | } |
| 4872 | seq_printf(m, "faux/mst: %*ph\n", 2, buf); |
| 4873 | |
| 4874 | ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL0x111, buf, 1); |
| 4875 | if (ret) { |
| 4876 | seq_printf(m, "mst ctrl read failed\n"); |
| 4877 | goto out; |
| 4878 | } |
| 4879 | seq_printf(m, "mst ctrl: %*ph\n", 1, buf); |
| 4880 | |
| 4881 | /* dump the standard OUI branch header */ |
| 4882 | ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI0x500, buf, DP_BRANCH_OUI_HEADER_SIZE0xc); |
| 4883 | if (ret) { |
| 4884 | seq_printf(m, "branch oui read failed\n"); |
| 4885 | goto out; |
| 4886 | } |
| 4887 | seq_printf(m, "branch oui: %*phN devid: ", 3, buf); |
| 4888 | |
| 4889 | for (i = 0x3; i < 0x8 && buf[i]; i++) |
| 4890 | seq_printf(m, "%c", buf[i]); |
| 4891 | seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n", |
| 4892 | buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]); |
| 4893 | if (dump_dp_payload_table(mgr, buf)) |
| 4894 | seq_printf(m, "payload table: %*ph\n", DP_PAYLOAD_TABLE_SIZE64, buf); |
| 4895 | } |
| 4896 | |
| 4897 | out: |
| 4898 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 4899 | |
| 4900 | } |
| 4901 | EXPORT_SYMBOL(drm_dp_mst_dump_topology); |
| 4902 | |
| 4903 | static void drm_dp_tx_work(struct work_struct *work) |
| 4904 | { |
| 4905 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work)({ const __typeof( ((struct drm_dp_mst_topology_mgr *)0)-> tx_work ) *__mptr = (work); (struct drm_dp_mst_topology_mgr * )( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_topology_mgr , tx_work) );}); |
| 4906 | |
| 4907 | mutex_lock(&mgr->qlock)rw_enter_write(&mgr->qlock); |
| 4908 | if (!list_empty(&mgr->tx_msg_downq)) |
| 4909 | process_single_down_tx_qlock(mgr); |
| 4910 | mutex_unlock(&mgr->qlock)rw_exit_write(&mgr->qlock); |
| 4911 | } |
| 4912 | |
| 4913 | static inline void |
| 4914 | drm_dp_delayed_destroy_port(struct drm_dp_mst_port *port) |
| 4915 | { |
| 4916 | drm_dp_port_set_pdt(port, DP_PEER_DEVICE_NONE0x0, port->mcs); |
| 4917 | |
| 4918 | if (port->connector) { |
| 4919 | drm_connector_unregister(port->connector); |
| 4920 | drm_connector_put(port->connector); |
| 4921 | } |
| 4922 | |
| 4923 | drm_dp_mst_put_port_malloc(port); |
| 4924 | } |
| 4925 | |
| 4926 | static inline void |
| 4927 | drm_dp_delayed_destroy_mstb(struct drm_dp_mst_branch *mstb) |
| 4928 | { |
| 4929 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
| 4930 | struct drm_dp_mst_port *port, *port_tmp; |
| 4931 | struct drm_dp_sideband_msg_tx *txmsg, *txmsg_tmp; |
| 4932 | bool_Bool wake_tx = false0; |
| 4933 | |
| 4934 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 4935 | list_for_each_entry_safe(port, port_tmp, &mstb->ports, next)for (port = ({ const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = ((&mstb->ports)->next); (__typeof(*port ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*port), next ) );}), port_tmp = ({ const __typeof( ((__typeof(*port) *)0)-> next ) *__mptr = (port->next.next); (__typeof(*port) *)( ( char *)__mptr - __builtin_offsetof(__typeof(*port), next) );} ); &port->next != (&mstb->ports); port = port_tmp , port_tmp = ({ const __typeof( ((__typeof(*port_tmp) *)0)-> next ) *__mptr = (port_tmp->next.next); (__typeof(*port_tmp ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*port_tmp) , next) );})) { |
| 4936 | list_del(&port->next); |
| 4937 | drm_dp_mst_topology_put_port(port); |
| 4938 | } |
| 4939 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 4940 | |
| 4941 | /* drop any tx slot msg */ |
| 4942 | mutex_lock(&mstb->mgr->qlock)rw_enter_write(&mstb->mgr->qlock); |
| 4943 | list_for_each_entry_safe(txmsg, txmsg_tmp, &mgr->tx_msg_downq, next)for (txmsg = ({ const __typeof( ((__typeof(*txmsg) *)0)->next ) *__mptr = ((&mgr->tx_msg_downq)->next); (__typeof (*txmsg) *)( (char *)__mptr - __builtin_offsetof(__typeof(*txmsg ), next) );}), txmsg_tmp = ({ const __typeof( ((__typeof(*txmsg ) *)0)->next ) *__mptr = (txmsg->next.next); (__typeof( *txmsg) *)( (char *)__mptr - __builtin_offsetof(__typeof(*txmsg ), next) );}); &txmsg->next != (&mgr->tx_msg_downq ); txmsg = txmsg_tmp, txmsg_tmp = ({ const __typeof( ((__typeof (*txmsg_tmp) *)0)->next ) *__mptr = (txmsg_tmp->next.next ); (__typeof(*txmsg_tmp) *)( (char *)__mptr - __builtin_offsetof (__typeof(*txmsg_tmp), next) );})) { |
| 4944 | if (txmsg->dst != mstb) |
| 4945 | continue; |
| 4946 | |
| 4947 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT4; |
| 4948 | list_del(&txmsg->next); |
| 4949 | wake_tx = true1; |
| 4950 | } |
| 4951 | mutex_unlock(&mstb->mgr->qlock)rw_exit_write(&mstb->mgr->qlock); |
| 4952 | |
| 4953 | if (wake_tx) |
| 4954 | wake_up_all(&mstb->mgr->tx_waitq)wake_up(&mstb->mgr->tx_waitq); |
| 4955 | |
| 4956 | drm_dp_mst_put_mstb_malloc(mstb); |
| 4957 | } |
| 4958 | |
| 4959 | static void drm_dp_delayed_destroy_work(struct work_struct *work) |
| 4960 | { |
| 4961 | struct drm_dp_mst_topology_mgr *mgr = |
| 4962 | container_of(work, struct drm_dp_mst_topology_mgr,({ const __typeof( ((struct drm_dp_mst_topology_mgr *)0)-> delayed_destroy_work ) *__mptr = (work); (struct drm_dp_mst_topology_mgr *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_topology_mgr , delayed_destroy_work) );}) |
| 4963 | delayed_destroy_work)({ const __typeof( ((struct drm_dp_mst_topology_mgr *)0)-> delayed_destroy_work ) *__mptr = (work); (struct drm_dp_mst_topology_mgr *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_topology_mgr , delayed_destroy_work) );}); |
| 4964 | bool_Bool send_hotplug = false0, go_again; |
| 4965 | |
| 4966 | /* |
| 4967 | * Not a regular list traverse as we have to drop the destroy |
| 4968 | * connector lock before destroying the mstb/port, to avoid AB->BA |
| 4969 | * ordering between this lock and the config mutex. |
| 4970 | */ |
| 4971 | do { |
| 4972 | go_again = false0; |
| 4973 | |
| 4974 | for (;;) { |
| 4975 | struct drm_dp_mst_branch *mstb; |
| 4976 | |
| 4977 | mutex_lock(&mgr->delayed_destroy_lock)rw_enter_write(&mgr->delayed_destroy_lock); |
| 4978 | mstb = list_first_entry_or_null(&mgr->destroy_branch_device_list,(list_empty(&mgr->destroy_branch_device_list) ? ((void *)0) : ({ const __typeof( ((struct drm_dp_mst_branch *)0)-> destroy_next ) *__mptr = ((&mgr->destroy_branch_device_list )->next); (struct drm_dp_mst_branch *)( (char *)__mptr - __builtin_offsetof (struct drm_dp_mst_branch, destroy_next) );})) |
| 4979 | struct drm_dp_mst_branch,(list_empty(&mgr->destroy_branch_device_list) ? ((void *)0) : ({ const __typeof( ((struct drm_dp_mst_branch *)0)-> destroy_next ) *__mptr = ((&mgr->destroy_branch_device_list )->next); (struct drm_dp_mst_branch *)( (char *)__mptr - __builtin_offsetof (struct drm_dp_mst_branch, destroy_next) );})) |
| 4980 | destroy_next)(list_empty(&mgr->destroy_branch_device_list) ? ((void *)0) : ({ const __typeof( ((struct drm_dp_mst_branch *)0)-> destroy_next ) *__mptr = ((&mgr->destroy_branch_device_list )->next); (struct drm_dp_mst_branch *)( (char *)__mptr - __builtin_offsetof (struct drm_dp_mst_branch, destroy_next) );})); |
| 4981 | if (mstb) |
| 4982 | list_del(&mstb->destroy_next); |
| 4983 | mutex_unlock(&mgr->delayed_destroy_lock)rw_exit_write(&mgr->delayed_destroy_lock); |
| 4984 | |
| 4985 | if (!mstb) |
| 4986 | break; |
| 4987 | |
| 4988 | drm_dp_delayed_destroy_mstb(mstb); |
| 4989 | go_again = true1; |
| 4990 | } |
| 4991 | |
| 4992 | for (;;) { |
| 4993 | struct drm_dp_mst_port *port; |
| 4994 | |
| 4995 | mutex_lock(&mgr->delayed_destroy_lock)rw_enter_write(&mgr->delayed_destroy_lock); |
| 4996 | port = list_first_entry_or_null(&mgr->destroy_port_list,(list_empty(&mgr->destroy_port_list) ? ((void *)0) : ( { const __typeof( ((struct drm_dp_mst_port *)0)->next ) *__mptr = ((&mgr->destroy_port_list)->next); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_port , next) );})) |
| 4997 | struct drm_dp_mst_port,(list_empty(&mgr->destroy_port_list) ? ((void *)0) : ( { const __typeof( ((struct drm_dp_mst_port *)0)->next ) *__mptr = ((&mgr->destroy_port_list)->next); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_port , next) );})) |
| 4998 | next)(list_empty(&mgr->destroy_port_list) ? ((void *)0) : ( { const __typeof( ((struct drm_dp_mst_port *)0)->next ) *__mptr = ((&mgr->destroy_port_list)->next); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_port , next) );})); |
| 4999 | if (port) |
| 5000 | list_del(&port->next); |
| 5001 | mutex_unlock(&mgr->delayed_destroy_lock)rw_exit_write(&mgr->delayed_destroy_lock); |
| 5002 | |
| 5003 | if (!port) |
| 5004 | break; |
| 5005 | |
| 5006 | drm_dp_delayed_destroy_port(port); |
| 5007 | send_hotplug = true1; |
| 5008 | go_again = true1; |
| 5009 | } |
| 5010 | } while (go_again); |
| 5011 | |
| 5012 | if (send_hotplug) |
| 5013 | drm_kms_helper_hotplug_event(mgr->dev); |
| 5014 | } |
| 5015 | |
| 5016 | static struct drm_private_state * |
| 5017 | drm_dp_mst_duplicate_state(struct drm_private_obj *obj) |
| 5018 | { |
| 5019 | struct drm_dp_mst_topology_state *state, *old_state = |
| 5020 | to_dp_mst_topology_state(obj->state)({ const __typeof( ((struct drm_dp_mst_topology_state *)0)-> base ) *__mptr = (obj->state); (struct drm_dp_mst_topology_state *)( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_topology_state , base) );}); |
| 5021 | struct drm_dp_vcpi_allocation *pos, *vcpi; |
| 5022 | |
| 5023 | state = kmemdup(old_state, sizeof(*state), GFP_KERNEL(0x0001 | 0x0004)); |
| 5024 | if (!state) |
| 5025 | return NULL((void *)0); |
| 5026 | |
| 5027 | __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base); |
| 5028 | |
| 5029 | INIT_LIST_HEAD(&state->vcpis); |
| 5030 | |
| 5031 | list_for_each_entry(pos, &old_state->vcpis, next)for (pos = ({ const __typeof( ((__typeof(*pos) *)0)->next ) *__mptr = ((&old_state->vcpis)->next); (__typeof(* pos) *)( (char *)__mptr - __builtin_offsetof(__typeof(*pos), next ) );}); &pos->next != (&old_state->vcpis); pos = ({ const __typeof( ((__typeof(*pos) *)0)->next ) *__mptr = (pos->next.next); (__typeof(*pos) *)( (char *)__mptr - __builtin_offsetof (__typeof(*pos), next) );})) { |
| 5032 | /* Prune leftover freed VCPI allocations */ |
| 5033 | if (!pos->vcpi) |
| 5034 | continue; |
| 5035 | |
| 5036 | vcpi = kmemdup(pos, sizeof(*vcpi), GFP_KERNEL(0x0001 | 0x0004)); |
| 5037 | if (!vcpi) |
| 5038 | goto fail; |
| 5039 | |
| 5040 | drm_dp_mst_get_port_malloc(vcpi->port); |
| 5041 | list_add(&vcpi->next, &state->vcpis); |
| 5042 | } |
| 5043 | |
| 5044 | return &state->base; |
| 5045 | |
| 5046 | fail: |
| 5047 | list_for_each_entry_safe(pos, vcpi, &state->vcpis, next)for (pos = ({ const __typeof( ((__typeof(*pos) *)0)->next ) *__mptr = ((&state->vcpis)->next); (__typeof(*pos) *)( (char *)__mptr - __builtin_offsetof(__typeof(*pos), next ) );}), vcpi = ({ const __typeof( ((__typeof(*pos) *)0)->next ) *__mptr = (pos->next.next); (__typeof(*pos) *)( (char * )__mptr - __builtin_offsetof(__typeof(*pos), next) );}); & pos->next != (&state->vcpis); pos = vcpi, vcpi = ({ const __typeof( ((__typeof(*vcpi) *)0)->next ) *__mptr = ( vcpi->next.next); (__typeof(*vcpi) *)( (char *)__mptr - __builtin_offsetof (__typeof(*vcpi), next) );})) { |
| 5048 | drm_dp_mst_put_port_malloc(pos->port); |
| 5049 | kfree(pos); |
| 5050 | } |
| 5051 | kfree(state); |
| 5052 | |
| 5053 | return NULL((void *)0); |
| 5054 | } |
| 5055 | |
| 5056 | static void drm_dp_mst_destroy_state(struct drm_private_obj *obj, |
| 5057 | struct drm_private_state *state) |
| 5058 | { |
| 5059 | struct drm_dp_mst_topology_state *mst_state = |
| 5060 | to_dp_mst_topology_state(state)({ const __typeof( ((struct drm_dp_mst_topology_state *)0)-> base ) *__mptr = (state); (struct drm_dp_mst_topology_state * )( (char *)__mptr - __builtin_offsetof(struct drm_dp_mst_topology_state , base) );}); |
| 5061 | struct drm_dp_vcpi_allocation *pos, *tmp; |
| 5062 | |
| 5063 | list_for_each_entry_safe(pos, tmp, &mst_state->vcpis, next)for (pos = ({ const __typeof( ((__typeof(*pos) *)0)->next ) *__mptr = ((&mst_state->vcpis)->next); (__typeof(* pos) *)( (char *)__mptr - __builtin_offsetof(__typeof(*pos), next ) );}), tmp = ({ const __typeof( ((__typeof(*pos) *)0)->next ) *__mptr = (pos->next.next); (__typeof(*pos) *)( (char * )__mptr - __builtin_offsetof(__typeof(*pos), next) );}); & pos->next != (&mst_state->vcpis); pos = tmp, tmp = ( { const __typeof( ((__typeof(*tmp) *)0)->next ) *__mptr = ( tmp->next.next); (__typeof(*tmp) *)( (char *)__mptr - __builtin_offsetof (__typeof(*tmp), next) );})) { |
| 5064 | /* We only keep references to ports with non-zero VCPIs */ |
| 5065 | if (pos->vcpi) |
| 5066 | drm_dp_mst_put_port_malloc(pos->port); |
| 5067 | kfree(pos); |
| 5068 | } |
| 5069 | |
| 5070 | kfree(mst_state); |
| 5071 | } |
| 5072 | |
| 5073 | static bool_Bool drm_dp_mst_port_downstream_of_branch(struct drm_dp_mst_port *port, |
| 5074 | struct drm_dp_mst_branch *branch) |
| 5075 | { |
| 5076 | while (port->parent) { |
| 5077 | if (port->parent == branch) |
| 5078 | return true1; |
| 5079 | |
| 5080 | if (port->parent->port_parent) |
| 5081 | port = port->parent->port_parent; |
| 5082 | else |
| 5083 | break; |
| 5084 | } |
| 5085 | return false0; |
| 5086 | } |
| 5087 | |
| 5088 | static int |
| 5089 | drm_dp_mst_atomic_check_port_bw_limit(struct drm_dp_mst_port *port, |
| 5090 | struct drm_dp_mst_topology_state *state); |
| 5091 | |
| 5092 | static int |
| 5093 | drm_dp_mst_atomic_check_mstb_bw_limit(struct drm_dp_mst_branch *mstb, |
| 5094 | struct drm_dp_mst_topology_state *state) |
| 5095 | { |
| 5096 | struct drm_dp_vcpi_allocation *vcpi; |
| 5097 | struct drm_dp_mst_port *port; |
| 5098 | int pbn_used = 0, ret; |
| 5099 | bool_Bool found = false0; |
| 5100 | |
| 5101 | /* Check that we have at least one port in our state that's downstream |
| 5102 | * of this branch, otherwise we can skip this branch |
| 5103 | */ |
| 5104 | list_for_each_entry(vcpi, &state->vcpis, next)for (vcpi = ({ const __typeof( ((__typeof(*vcpi) *)0)->next ) *__mptr = ((&state->vcpis)->next); (__typeof(*vcpi ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*vcpi), next ) );}); &vcpi->next != (&state->vcpis); vcpi = ( { const __typeof( ((__typeof(*vcpi) *)0)->next ) *__mptr = (vcpi->next.next); (__typeof(*vcpi) *)( (char *)__mptr - __builtin_offsetof (__typeof(*vcpi), next) );})) { |
| 5105 | if (!vcpi->pbn || |
| 5106 | !drm_dp_mst_port_downstream_of_branch(vcpi->port, mstb)) |
| 5107 | continue; |
| 5108 | |
| 5109 | found = true1; |
| 5110 | break; |
| 5111 | } |
| 5112 | if (!found) |
| 5113 | return 0; |
| 5114 | |
| 5115 | if (mstb->port_parent) |
| 5116 | DRM_DEBUG_ATOMIC("[MSTB:%p] [MST PORT:%p] Checking bandwidth limits on [MSTB:%p]\n",__drm_dbg(DRM_UT_ATOMIC, "[MSTB:%p] [MST PORT:%p] Checking bandwidth limits on [MSTB:%p]\n" , mstb->port_parent->parent, mstb->port_parent, mstb ) |
| 5117 | mstb->port_parent->parent, mstb->port_parent,__drm_dbg(DRM_UT_ATOMIC, "[MSTB:%p] [MST PORT:%p] Checking bandwidth limits on [MSTB:%p]\n" , mstb->port_parent->parent, mstb->port_parent, mstb ) |
| 5118 | mstb)__drm_dbg(DRM_UT_ATOMIC, "[MSTB:%p] [MST PORT:%p] Checking bandwidth limits on [MSTB:%p]\n" , mstb->port_parent->parent, mstb->port_parent, mstb ); |
| 5119 | else |
| 5120 | DRM_DEBUG_ATOMIC("[MSTB:%p] Checking bandwidth limits\n",__drm_dbg(DRM_UT_ATOMIC, "[MSTB:%p] Checking bandwidth limits\n" , mstb) |
| 5121 | mstb)__drm_dbg(DRM_UT_ATOMIC, "[MSTB:%p] Checking bandwidth limits\n" , mstb); |
| 5122 | |
| 5123 | list_for_each_entry(port, &mstb->ports, next)for (port = ({ const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = ((&mstb->ports)->next); (__typeof(*port ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*port), next ) );}); &port->next != (&mstb->ports); port = ( { const __typeof( ((__typeof(*port) *)0)->next ) *__mptr = (port->next.next); (__typeof(*port) *)( (char *)__mptr - __builtin_offsetof (__typeof(*port), next) );})) { |
| 5124 | ret = drm_dp_mst_atomic_check_port_bw_limit(port, state); |
| 5125 | if (ret < 0) |
| 5126 | return ret; |
| 5127 | |
| 5128 | pbn_used += ret; |
| 5129 | } |
| 5130 | |
| 5131 | return pbn_used; |
| 5132 | } |
| 5133 | |
| 5134 | static int |
| 5135 | drm_dp_mst_atomic_check_port_bw_limit(struct drm_dp_mst_port *port, |
| 5136 | struct drm_dp_mst_topology_state *state) |
| 5137 | { |
| 5138 | struct drm_dp_vcpi_allocation *vcpi; |
| 5139 | int pbn_used = 0; |
| 5140 | |
| 5141 | if (port->pdt == DP_PEER_DEVICE_NONE0x0) |
| 5142 | return 0; |
| 5143 | |
| 5144 | if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) { |
| 5145 | bool_Bool found = false0; |
| 5146 | |
| 5147 | list_for_each_entry(vcpi, &state->vcpis, next)for (vcpi = ({ const __typeof( ((__typeof(*vcpi) *)0)->next ) *__mptr = ((&state->vcpis)->next); (__typeof(*vcpi ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*vcpi), next ) );}); &vcpi->next != (&state->vcpis); vcpi = ( { const __typeof( ((__typeof(*vcpi) *)0)->next ) *__mptr = (vcpi->next.next); (__typeof(*vcpi) *)( (char *)__mptr - __builtin_offsetof (__typeof(*vcpi), next) );})) { |
| 5148 | if (vcpi->port != port) |
| 5149 | continue; |
| 5150 | if (!vcpi->pbn) |
| 5151 | return 0; |
| 5152 | |
| 5153 | found = true1; |
| 5154 | break; |
| 5155 | } |
| 5156 | if (!found) |
| 5157 | return 0; |
| 5158 | |
| 5159 | /* This should never happen, as it means we tried to |
| 5160 | * set a mode before querying the full_pbn |
| 5161 | */ |
| 5162 | if (WARN_ON(!port->full_pbn)({ int __ret = !!(!port->full_pbn); if (__ret) printf("WARNING %s failed at %s:%d\n" , "!port->full_pbn", "/usr/src/sys/dev/pci/drm/drm_dp_mst_topology.c" , 5162); __builtin_expect(!!(__ret), 0); })) |
| 5163 | return -EINVAL22; |
| 5164 | |
| 5165 | pbn_used = vcpi->pbn; |
| 5166 | } else { |
| 5167 | pbn_used = drm_dp_mst_atomic_check_mstb_bw_limit(port->mstb, |
| 5168 | state); |
| 5169 | if (pbn_used <= 0) |
| 5170 | return pbn_used; |
| 5171 | } |
| 5172 | |
| 5173 | if (pbn_used > port->full_pbn) { |
| 5174 | DRM_DEBUG_ATOMIC("[MSTB:%p] [MST PORT:%p] required PBN of %d exceeds port limit of %d\n",__drm_dbg(DRM_UT_ATOMIC, "[MSTB:%p] [MST PORT:%p] required PBN of %d exceeds port limit of %d\n" , port->parent, port, pbn_used, port->full_pbn) |
| 5175 | port->parent, port, pbn_used,__drm_dbg(DRM_UT_ATOMIC, "[MSTB:%p] [MST PORT:%p] required PBN of %d exceeds port limit of %d\n" , port->parent, port, pbn_used, port->full_pbn) |
| 5176 | port->full_pbn)__drm_dbg(DRM_UT_ATOMIC, "[MSTB:%p] [MST PORT:%p] required PBN of %d exceeds port limit of %d\n" , port->parent, port, pbn_used, port->full_pbn); |
| 5177 | return -ENOSPC28; |
| 5178 | } |
| 5179 | |
| 5180 | DRM_DEBUG_ATOMIC("[MSTB:%p] [MST PORT:%p] uses %d out of %d PBN\n",__drm_dbg(DRM_UT_ATOMIC, "[MSTB:%p] [MST PORT:%p] uses %d out of %d PBN\n" , port->parent, port, pbn_used, port->full_pbn) |
| 5181 | port->parent, port, pbn_used, port->full_pbn)__drm_dbg(DRM_UT_ATOMIC, "[MSTB:%p] [MST PORT:%p] uses %d out of %d PBN\n" , port->parent, port, pbn_used, port->full_pbn); |
| 5182 | |
| 5183 | return pbn_used; |
| 5184 | } |
| 5185 | |
| 5186 | static inline int |
| 5187 | drm_dp_mst_atomic_check_vcpi_alloc_limit(struct drm_dp_mst_topology_mgr *mgr, |
| 5188 | struct drm_dp_mst_topology_state *mst_state) |
| 5189 | { |
| 5190 | struct drm_dp_vcpi_allocation *vcpi; |
| 5191 | int avail_slots = 63, payload_count = 0; |
| 5192 | |
| 5193 | list_for_each_entry(vcpi, &mst_state->vcpis, next)for (vcpi = ({ const __typeof( ((__typeof(*vcpi) *)0)->next ) *__mptr = ((&mst_state->vcpis)->next); (__typeof (*vcpi) *)( (char *)__mptr - __builtin_offsetof(__typeof(*vcpi ), next) );}); &vcpi->next != (&mst_state->vcpis ); vcpi = ({ const __typeof( ((__typeof(*vcpi) *)0)->next ) *__mptr = (vcpi->next.next); (__typeof(*vcpi) *)( (char * )__mptr - __builtin_offsetof(__typeof(*vcpi), next) );})) { |
| 5194 | /* Releasing VCPI is always OK-even if the port is gone */ |
| 5195 | if (!vcpi->vcpi) { |
| 5196 | DRM_DEBUG_ATOMIC("[MST PORT:%p] releases all VCPI slots\n",__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] releases all VCPI slots\n" , vcpi->port) |
| 5197 | vcpi->port)__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] releases all VCPI slots\n" , vcpi->port); |
| 5198 | continue; |
| 5199 | } |
| 5200 | |
| 5201 | DRM_DEBUG_ATOMIC("[MST PORT:%p] requires %d vcpi slots\n",__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] requires %d vcpi slots\n" , vcpi->port, vcpi->vcpi) |
| 5202 | vcpi->port, vcpi->vcpi)__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] requires %d vcpi slots\n" , vcpi->port, vcpi->vcpi); |
| 5203 | |
| 5204 | avail_slots -= vcpi->vcpi; |
| 5205 | if (avail_slots < 0) { |
| 5206 | DRM_DEBUG_ATOMIC("[MST PORT:%p] not enough VCPI slots in mst state %p (avail=%d)\n",__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] not enough VCPI slots in mst state %p (avail=%d)\n" , vcpi->port, mst_state, avail_slots + vcpi->vcpi) |
| 5207 | vcpi->port, mst_state,__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] not enough VCPI slots in mst state %p (avail=%d)\n" , vcpi->port, mst_state, avail_slots + vcpi->vcpi) |
| 5208 | avail_slots + vcpi->vcpi)__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] not enough VCPI slots in mst state %p (avail=%d)\n" , vcpi->port, mst_state, avail_slots + vcpi->vcpi); |
| 5209 | return -ENOSPC28; |
| 5210 | } |
| 5211 | |
| 5212 | if (++payload_count > mgr->max_payloads) { |
| 5213 | DRM_DEBUG_ATOMIC("[MST MGR:%p] state %p has too many payloads (max=%d)\n",__drm_dbg(DRM_UT_ATOMIC, "[MST MGR:%p] state %p has too many payloads (max=%d)\n" , mgr, mst_state, mgr->max_payloads) |
| 5214 | mgr, mst_state, mgr->max_payloads)__drm_dbg(DRM_UT_ATOMIC, "[MST MGR:%p] state %p has too many payloads (max=%d)\n" , mgr, mst_state, mgr->max_payloads); |
| 5215 | return -EINVAL22; |
| 5216 | } |
| 5217 | } |
| 5218 | DRM_DEBUG_ATOMIC("[MST MGR:%p] mst state %p VCPI avail=%d used=%d\n",__drm_dbg(DRM_UT_ATOMIC, "[MST MGR:%p] mst state %p VCPI avail=%d used=%d\n" , mgr, mst_state, avail_slots, 63 - avail_slots) |
| 5219 | mgr, mst_state, avail_slots,__drm_dbg(DRM_UT_ATOMIC, "[MST MGR:%p] mst state %p VCPI avail=%d used=%d\n" , mgr, mst_state, avail_slots, 63 - avail_slots) |
| 5220 | 63 - avail_slots)__drm_dbg(DRM_UT_ATOMIC, "[MST MGR:%p] mst state %p VCPI avail=%d used=%d\n" , mgr, mst_state, avail_slots, 63 - avail_slots); |
| 5221 | |
| 5222 | return 0; |
| 5223 | } |
| 5224 | |
| 5225 | /** |
| 5226 | * drm_dp_mst_add_affected_dsc_crtcs |
| 5227 | * @state: Pointer to the new struct drm_dp_mst_topology_state |
| 5228 | * @mgr: MST topology manager |
| 5229 | * |
| 5230 | * Whenever there is a change in mst topology |
| 5231 | * DSC configuration would have to be recalculated |
| 5232 | * therefore we need to trigger modeset on all affected |
| 5233 | * CRTCs in that topology |
| 5234 | * |
| 5235 | * See also: |
| 5236 | * drm_dp_mst_atomic_enable_dsc() |
| 5237 | */ |
| 5238 | int drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state, struct drm_dp_mst_topology_mgr *mgr) |
| 5239 | { |
| 5240 | struct drm_dp_mst_topology_state *mst_state; |
| 5241 | struct drm_dp_vcpi_allocation *pos; |
| 5242 | struct drm_connector *connector; |
| 5243 | struct drm_connector_state *conn_state; |
| 5244 | struct drm_crtc *crtc; |
| 5245 | struct drm_crtc_state *crtc_state; |
| 5246 | |
| 5247 | mst_state = drm_atomic_get_mst_topology_state(state, mgr); |
| 5248 | |
| 5249 | if (IS_ERR(mst_state)) |
| 5250 | return -EINVAL22; |
| 5251 | |
| 5252 | list_for_each_entry(pos, &mst_state->vcpis, next)for (pos = ({ const __typeof( ((__typeof(*pos) *)0)->next ) *__mptr = ((&mst_state->vcpis)->next); (__typeof(* pos) *)( (char *)__mptr - __builtin_offsetof(__typeof(*pos), next ) );}); &pos->next != (&mst_state->vcpis); pos = ({ const __typeof( ((__typeof(*pos) *)0)->next ) *__mptr = (pos->next.next); (__typeof(*pos) *)( (char *)__mptr - __builtin_offsetof (__typeof(*pos), next) );})) { |
| 5253 | |
| 5254 | connector = pos->port->connector; |
| 5255 | |
| 5256 | if (!connector) |
| 5257 | return -EINVAL22; |
| 5258 | |
| 5259 | conn_state = drm_atomic_get_connector_state(state, connector); |
| 5260 | |
| 5261 | if (IS_ERR(conn_state)) |
| 5262 | return PTR_ERR(conn_state); |
| 5263 | |
| 5264 | crtc = conn_state->crtc; |
| 5265 | |
| 5266 | if (!crtc) |
| 5267 | continue; |
| 5268 | |
| 5269 | if (!drm_dp_mst_dsc_aux_for_port(pos->port)) |
| 5270 | continue; |
| 5271 | |
| 5272 | crtc_state = drm_atomic_get_crtc_state(mst_state->base.state, crtc); |
| 5273 | |
| 5274 | if (IS_ERR(crtc_state)) |
| 5275 | return PTR_ERR(crtc_state); |
| 5276 | |
| 5277 | DRM_DEBUG_ATOMIC("[MST MGR:%p] Setting mode_changed flag on CRTC %p\n",__drm_dbg(DRM_UT_ATOMIC, "[MST MGR:%p] Setting mode_changed flag on CRTC %p\n" , mgr, crtc) |
| 5278 | mgr, crtc)__drm_dbg(DRM_UT_ATOMIC, "[MST MGR:%p] Setting mode_changed flag on CRTC %p\n" , mgr, crtc); |
| 5279 | |
| 5280 | crtc_state->mode_changed = true1; |
| 5281 | } |
| 5282 | return 0; |
| 5283 | } |
| 5284 | EXPORT_SYMBOL(drm_dp_mst_add_affected_dsc_crtcs); |
| 5285 | |
| 5286 | /** |
| 5287 | * drm_dp_mst_atomic_enable_dsc - Set DSC Enable Flag to On/Off |
| 5288 | * @state: Pointer to the new drm_atomic_state |
| 5289 | * @port: Pointer to the affected MST Port |
| 5290 | * @pbn: Newly recalculated bw required for link with DSC enabled |
| 5291 | * @pbn_div: Divider to calculate correct number of pbn per slot |
| 5292 | * @enable: Boolean flag to enable or disable DSC on the port |
| 5293 | * |
| 5294 | * This function enables DSC on the given Port |
| 5295 | * by recalculating its vcpi from pbn provided |
| 5296 | * and sets dsc_enable flag to keep track of which |
| 5297 | * ports have DSC enabled |
| 5298 | * |
| 5299 | */ |
| 5300 | int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state, |
| 5301 | struct drm_dp_mst_port *port, |
| 5302 | int pbn, int pbn_div, |
| 5303 | bool_Bool enable) |
| 5304 | { |
| 5305 | struct drm_dp_mst_topology_state *mst_state; |
| 5306 | struct drm_dp_vcpi_allocation *pos; |
| 5307 | bool_Bool found = false0; |
| 5308 | int vcpi = 0; |
| 5309 | |
| 5310 | mst_state = drm_atomic_get_mst_topology_state(state, port->mgr); |
| 5311 | |
| 5312 | if (IS_ERR(mst_state)) |
| 5313 | return PTR_ERR(mst_state); |
| 5314 | |
| 5315 | list_for_each_entry(pos, &mst_state->vcpis, next)for (pos = ({ const __typeof( ((__typeof(*pos) *)0)->next ) *__mptr = ((&mst_state->vcpis)->next); (__typeof(* pos) *)( (char *)__mptr - __builtin_offsetof(__typeof(*pos), next ) );}); &pos->next != (&mst_state->vcpis); pos = ({ const __typeof( ((__typeof(*pos) *)0)->next ) *__mptr = (pos->next.next); (__typeof(*pos) *)( (char *)__mptr - __builtin_offsetof (__typeof(*pos), next) );})) { |
| 5316 | if (pos->port == port) { |
| 5317 | found = true1; |
| 5318 | break; |
| 5319 | } |
| 5320 | } |
| 5321 | |
| 5322 | if (!found) { |
| 5323 | DRM_DEBUG_ATOMIC("[MST PORT:%p] Couldn't find VCPI allocation in mst state %p\n",__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] Couldn't find VCPI allocation in mst state %p\n" , port, mst_state) |
| 5324 | port, mst_state)__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] Couldn't find VCPI allocation in mst state %p\n" , port, mst_state); |
| 5325 | return -EINVAL22; |
| 5326 | } |
| 5327 | |
| 5328 | if (pos->dsc_enabled == enable) { |
| 5329 | DRM_DEBUG_ATOMIC("[MST PORT:%p] DSC flag is already set to %d, returning %d VCPI slots\n",__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] DSC flag is already set to %d, returning %d VCPI slots\n" , port, enable, pos->vcpi) |
| 5330 | port, enable, pos->vcpi)__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] DSC flag is already set to %d, returning %d VCPI slots\n" , port, enable, pos->vcpi); |
| 5331 | vcpi = pos->vcpi; |
| 5332 | } |
| 5333 | |
| 5334 | if (enable) { |
| 5335 | vcpi = drm_dp_atomic_find_vcpi_slots(state, port->mgr, port, pbn, pbn_div); |
| 5336 | DRM_DEBUG_ATOMIC("[MST PORT:%p] Enabling DSC flag, reallocating %d VCPI slots on the port\n",__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] Enabling DSC flag, reallocating %d VCPI slots on the port\n" , port, vcpi) |
| 5337 | port, vcpi)__drm_dbg(DRM_UT_ATOMIC, "[MST PORT:%p] Enabling DSC flag, reallocating %d VCPI slots on the port\n" , port, vcpi); |
| 5338 | if (vcpi < 0) |
| 5339 | return -EINVAL22; |
| 5340 | } |
| 5341 | |
| 5342 | pos->dsc_enabled = enable; |
| 5343 | |
| 5344 | return vcpi; |
| 5345 | } |
| 5346 | EXPORT_SYMBOL(drm_dp_mst_atomic_enable_dsc); |
| 5347 | /** |
| 5348 | * drm_dp_mst_atomic_check - Check that the new state of an MST topology in an |
| 5349 | * atomic update is valid |
| 5350 | * @state: Pointer to the new &struct drm_dp_mst_topology_state |
| 5351 | * |
| 5352 | * Checks the given topology state for an atomic update to ensure that it's |
| 5353 | * valid. This includes checking whether there's enough bandwidth to support |
| 5354 | * the new VCPI allocations in the atomic update. |
| 5355 | * |
| 5356 | * Any atomic drivers supporting DP MST must make sure to call this after |
| 5357 | * checking the rest of their state in their |
| 5358 | * &drm_mode_config_funcs.atomic_check() callback. |
| 5359 | * |
| 5360 | * See also: |
| 5361 | * drm_dp_atomic_find_vcpi_slots() |
| 5362 | * drm_dp_atomic_release_vcpi_slots() |
| 5363 | * |
| 5364 | * Returns: |
| 5365 | * |
| 5366 | * 0 if the new state is valid, negative error code otherwise. |
| 5367 | */ |
| 5368 | int drm_dp_mst_atomic_check(struct drm_atomic_state *state) |
| 5369 | { |
| 5370 | struct drm_dp_mst_topology_mgr *mgr; |
| 5371 | struct drm_dp_mst_topology_state *mst_state; |
| 5372 | int i, ret = 0; |
| 5373 | |
| 5374 | for_each_new_mst_mgr_in_state(state, mgr, mst_state, i)for ((i) = 0; (i) < (state)->num_private_objs; (i)++) if (!(__drm_dp_mst_state_iter_get((state), &(mgr), ((void * )0), &(mst_state), (i)))) {} else { |
| 5375 | if (!mgr->mst_state) |
| 5376 | continue; |
| 5377 | |
| 5378 | ret = drm_dp_mst_atomic_check_vcpi_alloc_limit(mgr, mst_state); |
| 5379 | if (ret) |
| 5380 | break; |
| 5381 | |
| 5382 | mutex_lock(&mgr->lock)rw_enter_write(&mgr->lock); |
| 5383 | ret = drm_dp_mst_atomic_check_mstb_bw_limit(mgr->mst_primary, |
| 5384 | mst_state); |
| 5385 | mutex_unlock(&mgr->lock)rw_exit_write(&mgr->lock); |
| 5386 | if (ret < 0) |
| 5387 | break; |
| 5388 | else |
| 5389 | ret = 0; |
| 5390 | } |
| 5391 | |
| 5392 | return ret; |
| 5393 | } |
| 5394 | EXPORT_SYMBOL(drm_dp_mst_atomic_check); |
| 5395 | |
| 5396 | const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs = { |
| 5397 | .atomic_duplicate_state = drm_dp_mst_duplicate_state, |
| 5398 | .atomic_destroy_state = drm_dp_mst_destroy_state, |
| 5399 | }; |
| 5400 | EXPORT_SYMBOL(drm_dp_mst_topology_state_funcs); |
| 5401 | |
| 5402 | /** |
| 5403 | * drm_atomic_get_mst_topology_state: get MST topology state |
| 5404 | * |
| 5405 | * @state: global atomic state |
| 5406 | * @mgr: MST topology manager, also the private object in this case |
| 5407 | * |
| 5408 | * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic |
| 5409 | * state vtable so that the private object state returned is that of a MST |
| 5410 | * topology object. Also, drm_atomic_get_private_obj_state() expects the caller |
| 5411 | * to care of the locking, so warn if don't hold the connection_mutex. |
| 5412 | * |
| 5413 | * RETURNS: |
| 5414 | * |
| 5415 | * The MST topology state or error pointer. |
| 5416 | */ |
| 5417 | struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state, |
| 5418 | struct drm_dp_mst_topology_mgr *mgr) |
| 5419 | { |
| 5420 | return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base))({ const __typeof( ((struct drm_dp_mst_topology_state *)0)-> base ) *__mptr = (drm_atomic_get_private_obj_state(state, & mgr->base)); (struct drm_dp_mst_topology_state *)( (char * )__mptr - __builtin_offsetof(struct drm_dp_mst_topology_state , base) );}); |
| 5421 | } |
| 5422 | EXPORT_SYMBOL(drm_atomic_get_mst_topology_state); |
| 5423 | |
| 5424 | /** |
| 5425 | * drm_dp_mst_topology_mgr_init - initialise a topology manager |
| 5426 | * @mgr: manager struct to initialise |
| 5427 | * @dev: device providing this structure - for i2c addition. |
| 5428 | * @aux: DP helper aux channel to talk to this device |
| 5429 | * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit |
| 5430 | * @max_payloads: maximum number of payloads this GPU can source |
| 5431 | * @conn_base_id: the connector object ID the MST device is connected to. |
| 5432 | * |
| 5433 | * Return 0 for success, or negative error code on failure |
| 5434 | */ |
| 5435 | int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, |
| 5436 | struct drm_device *dev, struct drm_dp_aux *aux, |
| 5437 | int max_dpcd_transaction_bytes, |
| 5438 | int max_payloads, int conn_base_id) |
| 5439 | { |
| 5440 | struct drm_dp_mst_topology_state *mst_state; |
| 5441 | |
| 5442 | rw_init(&mgr->lock, "mst")_rw_init_flags(&mgr->lock, "mst", 0, ((void *)0)); |
| 5443 | rw_init(&mgr->qlock, "mstq")_rw_init_flags(&mgr->qlock, "mstq", 0, ((void *)0)); |
| 5444 | rw_init(&mgr->payload_lock, "mstpl")_rw_init_flags(&mgr->payload_lock, "mstpl", 0, ((void * )0)); |
| 5445 | rw_init(&mgr->delayed_destroy_lock, "mstdc")_rw_init_flags(&mgr->delayed_destroy_lock, "mstdc", 0, ((void *)0)); |
| 5446 | rw_init(&mgr->up_req_lock, "mstup")_rw_init_flags(&mgr->up_req_lock, "mstup", 0, ((void * )0)); |
| 5447 | rw_init(&mgr->probe_lock, "mstprb")_rw_init_flags(&mgr->probe_lock, "mstprb", 0, ((void * )0)); |
| 5448 | #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)0 |
| 5449 | rw_init(&mgr->topology_ref_history_lock, "mstref")_rw_init_flags(&mgr->topology_ref_history_lock, "mstref" , 0, ((void *)0)); |
| 5450 | #endif |
| 5451 | INIT_LIST_HEAD(&mgr->tx_msg_downq); |
| 5452 | INIT_LIST_HEAD(&mgr->destroy_port_list); |
| 5453 | INIT_LIST_HEAD(&mgr->destroy_branch_device_list); |
| 5454 | INIT_LIST_HEAD(&mgr->up_req_list); |
| 5455 | |
| 5456 | /* |
| 5457 | * delayed_destroy_work will be queued on a dedicated WQ, so that any |
| 5458 | * requeuing will be also flushed when deiniting the topology manager. |
| 5459 | */ |
| 5460 | mgr->delayed_destroy_wq = alloc_ordered_workqueue("drm_dp_mst_wq", 0); |
| 5461 | if (mgr->delayed_destroy_wq == NULL((void *)0)) |
| 5462 | return -ENOMEM12; |
| 5463 | |
| 5464 | INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); |
| 5465 | INIT_WORK(&mgr->tx_work, drm_dp_tx_work); |
| 5466 | INIT_WORK(&mgr->delayed_destroy_work, drm_dp_delayed_destroy_work); |
| 5467 | INIT_WORK(&mgr->up_req_work, drm_dp_mst_up_req_work); |
| 5468 | init_waitqueue_head(&mgr->tx_waitq); |
| 5469 | mgr->dev = dev; |
| 5470 | mgr->aux = aux; |
| 5471 | mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; |
| 5472 | mgr->max_payloads = max_payloads; |
| 5473 | mgr->conn_base_id = conn_base_id; |
| 5474 | if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 || |
| 5475 | max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8) |
| 5476 | return -EINVAL22; |
| 5477 | mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL(0x0001 | 0x0004)); |
| 5478 | if (!mgr->payloads) |
| 5479 | return -ENOMEM12; |
| 5480 | mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL(0x0001 | 0x0004)); |
| 5481 | if (!mgr->proposed_vcpis) |
| 5482 | return -ENOMEM12; |
| 5483 | set_bit(0, &mgr->payload_mask); |
| 5484 | |
| 5485 | mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL(0x0001 | 0x0004)); |
| 5486 | if (mst_state == NULL((void *)0)) |
| 5487 | return -ENOMEM12; |
| 5488 | |
| 5489 | mst_state->mgr = mgr; |
| 5490 | INIT_LIST_HEAD(&mst_state->vcpis); |
| 5491 | |
| 5492 | drm_atomic_private_obj_init(dev, &mgr->base, |
| 5493 | &mst_state->base, |
| 5494 | &drm_dp_mst_topology_state_funcs); |
| 5495 | |
| 5496 | return 0; |
| 5497 | } |
| 5498 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); |
| 5499 | |
| 5500 | /** |
| 5501 | * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. |
| 5502 | * @mgr: manager to destroy |
| 5503 | */ |
| 5504 | void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) |
| 5505 | { |
| 5506 | drm_dp_mst_topology_mgr_set_mst(mgr, false0); |
| 5507 | flush_work(&mgr->work); |
| 5508 | /* The following will also drain any requeued work on the WQ. */ |
| 5509 | if (mgr->delayed_destroy_wq) { |
| 5510 | destroy_workqueue(mgr->delayed_destroy_wq); |
| 5511 | mgr->delayed_destroy_wq = NULL((void *)0); |
| 5512 | } |
| 5513 | mutex_lock(&mgr->payload_lock)rw_enter_write(&mgr->payload_lock); |
| 5514 | kfree(mgr->payloads); |
| 5515 | mgr->payloads = NULL((void *)0); |
| 5516 | kfree(mgr->proposed_vcpis); |
| 5517 | mgr->proposed_vcpis = NULL((void *)0); |
| 5518 | mutex_unlock(&mgr->payload_lock)rw_exit_write(&mgr->payload_lock); |
| 5519 | mgr->dev = NULL((void *)0); |
| 5520 | mgr->aux = NULL((void *)0); |
| 5521 | drm_atomic_private_obj_fini(&mgr->base); |
| 5522 | mgr->funcs = NULL((void *)0); |
| 5523 | |
| 5524 | mutex_destroy(&mgr->delayed_destroy_lock); |
| 5525 | mutex_destroy(&mgr->payload_lock); |
| 5526 | mutex_destroy(&mgr->qlock); |
| 5527 | mutex_destroy(&mgr->lock); |
| 5528 | mutex_destroy(&mgr->up_req_lock); |
| 5529 | mutex_destroy(&mgr->probe_lock); |
| 5530 | #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)0 |
| 5531 | mutex_destroy(&mgr->topology_ref_history_lock); |
| 5532 | #endif |
| 5533 | } |
| 5534 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); |
| 5535 | |
| 5536 | static bool_Bool remote_i2c_read_ok(const struct i2c_msg msgs[], int num) |
| 5537 | { |
| 5538 | int i; |
| 5539 | |
| 5540 | if (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS4) |
| 5541 | return false0; |
| 5542 | |
| 5543 | for (i = 0; i < num - 1; i++) { |
| 5544 | if (msgs[i].flags & I2C_M_RD0x0001 || |
| 5545 | msgs[i].len > 0xff) |
| 5546 | return false0; |
| 5547 | } |
| 5548 | |
| 5549 | return msgs[num - 1].flags & I2C_M_RD0x0001 && |
| 5550 | msgs[num - 1].len <= 0xff; |
| 5551 | } |
| 5552 | |
| 5553 | static bool_Bool remote_i2c_write_ok(const struct i2c_msg msgs[], int num) |
| 5554 | { |
| 5555 | int i; |
| 5556 | |
| 5557 | for (i = 0; i < num - 1; i++) { |
| 5558 | if (msgs[i].flags & I2C_M_RD0x0001 || !(msgs[i].flags & I2C_M_STOP0x0004) || |
| 5559 | msgs[i].len > 0xff) |
| 5560 | return false0; |
| 5561 | } |
| 5562 | |
| 5563 | return !(msgs[num - 1].flags & I2C_M_RD0x0001) && msgs[num - 1].len <= 0xff; |
| 5564 | } |
| 5565 | |
| 5566 | static int drm_dp_mst_i2c_read(struct drm_dp_mst_branch *mstb, |
| 5567 | struct drm_dp_mst_port *port, |
| 5568 | struct i2c_msg *msgs, int num) |
| 5569 | { |
| 5570 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
| 5571 | unsigned int i; |
| 5572 | struct drm_dp_sideband_msg_req_body msg; |
| 5573 | struct drm_dp_sideband_msg_tx *txmsg = NULL((void *)0); |
| 5574 | int ret; |
| 5575 | |
| 5576 | memset(&msg, 0, sizeof(msg))__builtin_memset((&msg), (0), (sizeof(msg))); |
| 5577 | msg.req_type = DP_REMOTE_I2C_READ0x22; |
| 5578 | msg.u.i2c_read.num_transactions = num - 1; |
| 5579 | msg.u.i2c_read.port_number = port->port_num; |
| 5580 | for (i = 0; i < num - 1; i++) { |
| 5581 | msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; |
| 5582 | msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; |
| 5583 | msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; |
| 5584 | msg.u.i2c_read.transactions[i].no_stop_bit = !(msgs[i].flags & I2C_M_STOP0x0004); |
| 5585 | } |
| 5586 | msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; |
| 5587 | msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; |
| 5588 | |
| 5589 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL(0x0001 | 0x0004)); |
| 5590 | if (!txmsg) { |
| 5591 | ret = -ENOMEM12; |
| 5592 | goto out; |
| 5593 | } |
| 5594 | |
| 5595 | txmsg->dst = mstb; |
| 5596 | drm_dp_encode_sideband_req(&msg, txmsg); |
| 5597 | |
| 5598 | drm_dp_queue_down_tx(mgr, txmsg); |
| 5599 | |
| 5600 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 5601 | if (ret > 0) { |
| 5602 | |
| 5603 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK0x01) { |
| 5604 | ret = -EREMOTEIO5; |
| 5605 | goto out; |
| 5606 | } |
| 5607 | if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { |
| 5608 | ret = -EIO5; |
| 5609 | goto out; |
| 5610 | } |
| 5611 | memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len)__builtin_memcpy((msgs[num - 1].buf), (txmsg->reply.u.remote_i2c_read_ack .bytes), (msgs[num - 1].len)); |
| 5612 | ret = num; |
| 5613 | } |
| 5614 | out: |
| 5615 | kfree(txmsg); |
| 5616 | return ret; |
| 5617 | } |
| 5618 | |
| 5619 | static int drm_dp_mst_i2c_write(struct drm_dp_mst_branch *mstb, |
| 5620 | struct drm_dp_mst_port *port, |
| 5621 | struct i2c_msg *msgs, int num) |
| 5622 | { |
| 5623 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
| 5624 | unsigned int i; |
| 5625 | struct drm_dp_sideband_msg_req_body msg; |
| 5626 | struct drm_dp_sideband_msg_tx *txmsg = NULL((void *)0); |
| 5627 | int ret; |
| 5628 | |
| 5629 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL(0x0001 | 0x0004)); |
| 5630 | if (!txmsg) { |
| 5631 | ret = -ENOMEM12; |
| 5632 | goto out; |
| 5633 | } |
| 5634 | for (i = 0; i < num; i++) { |
| 5635 | memset(&msg, 0, sizeof(msg))__builtin_memset((&msg), (0), (sizeof(msg))); |
| 5636 | msg.req_type = DP_REMOTE_I2C_WRITE0x23; |
| 5637 | msg.u.i2c_write.port_number = port->port_num; |
| 5638 | msg.u.i2c_write.write_i2c_device_id = msgs[i].addr; |
| 5639 | msg.u.i2c_write.num_bytes = msgs[i].len; |
| 5640 | msg.u.i2c_write.bytes = msgs[i].buf; |
| 5641 | |
| 5642 | memset(txmsg, 0, sizeof(*txmsg))__builtin_memset((txmsg), (0), (sizeof(*txmsg))); |
| 5643 | txmsg->dst = mstb; |
| 5644 | |
| 5645 | drm_dp_encode_sideband_req(&msg, txmsg); |
| 5646 | drm_dp_queue_down_tx(mgr, txmsg); |
| 5647 | |
| 5648 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 5649 | if (ret > 0) { |
| 5650 | if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK0x01) { |
| 5651 | ret = -EREMOTEIO5; |
| 5652 | goto out; |
| 5653 | } |
| 5654 | } else { |
| 5655 | goto out; |
| 5656 | } |
| 5657 | } |
| 5658 | ret = num; |
| 5659 | out: |
| 5660 | kfree(txmsg); |
| 5661 | return ret; |
| 5662 | } |
| 5663 | |
| 5664 | /* I2C device */ |
| 5665 | static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, |
| 5666 | struct i2c_msg *msgs, int num) |
| 5667 | { |
| 5668 | struct drm_dp_aux *aux = adapter->algo_data; |
| 5669 | struct drm_dp_mst_port *port = |
| 5670 | container_of(aux, struct drm_dp_mst_port, aux)({ const __typeof( ((struct drm_dp_mst_port *)0)->aux ) *__mptr = (aux); (struct drm_dp_mst_port *)( (char *)__mptr - __builtin_offsetof (struct drm_dp_mst_port, aux) );}); |
| 5671 | struct drm_dp_mst_branch *mstb; |
| 5672 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
| 5673 | int ret; |
| 5674 | |
| 5675 | mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent); |
| 5676 | if (!mstb) |
| 5677 | return -EREMOTEIO5; |
| 5678 | |
| 5679 | if (remote_i2c_read_ok(msgs, num)) { |
| 5680 | ret = drm_dp_mst_i2c_read(mstb, port, msgs, num); |
| 5681 | } else if (remote_i2c_write_ok(msgs, num)) { |
| 5682 | ret = drm_dp_mst_i2c_write(mstb, port, msgs, num); |
| 5683 | } else { |
| 5684 | DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n")__drm_dbg(DRM_UT_KMS, "Unsupported I2C transaction for MST device\n" ); |
| 5685 | ret = -EIO5; |
| 5686 | } |
| 5687 | |
| 5688 | drm_dp_mst_topology_put_mstb(mstb); |
| 5689 | return ret; |
| 5690 | } |
| 5691 | |
| 5692 | static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) |
| 5693 | { |
| 5694 | return I2C_FUNC_I2C0 | I2C_FUNC_SMBUS_EMUL0 | |
| 5695 | I2C_FUNC_SMBUS_READ_BLOCK_DATA0 | |
| 5696 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL0 | |
| 5697 | I2C_FUNC_10BIT_ADDR0; |
| 5698 | } |
| 5699 | |
| 5700 | static const struct i2c_algorithm drm_dp_mst_i2c_algo = { |
| 5701 | .functionality = drm_dp_mst_i2c_functionality, |
| 5702 | .master_xfer = drm_dp_mst_i2c_xfer, |
| 5703 | }; |
| 5704 | |
| 5705 | /** |
| 5706 | * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX |
| 5707 | * @port: The port to add the I2C bus on |
| 5708 | * |
| 5709 | * Returns 0 on success or a negative error code on failure. |
| 5710 | */ |
| 5711 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_mst_port *port) |
| 5712 | { |
| 5713 | struct drm_dp_aux *aux = &port->aux; |
| 5714 | #ifdef __linux__ |
| 5715 | struct device *parent_dev = port->mgr->dev->dev; |
| 5716 | #endif |
| 5717 | |
| 5718 | aux->ddc.algo = &drm_dp_mst_i2c_algo; |
| 5719 | aux->ddc.algo_data = aux; |
| 5720 | aux->ddc.retries = 3; |
| 5721 | |
| 5722 | #ifdef __linux__ |
| 5723 | aux->ddc.class = I2C_CLASS_DDC; |
| 5724 | aux->ddc.owner = THIS_MODULE((void *)0); |
| 5725 | /* FIXME: set the kdev of the port's connector as parent */ |
| 5726 | aux->ddc.dev.parent = parent_dev; |
| 5727 | aux->ddc.dev.of_node = parent_dev->of_node; |
| 5728 | #endif |
| 5729 | |
| 5730 | strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(parent_dev)"", |
| 5731 | sizeof(aux->ddc.name)); |
| 5732 | |
| 5733 | return i2c_add_adapter(&aux->ddc)0; |
| 5734 | } |
| 5735 | |
| 5736 | /** |
| 5737 | * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter |
| 5738 | * @port: The port to remove the I2C bus from |
| 5739 | */ |
| 5740 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_mst_port *port) |
| 5741 | { |
| 5742 | i2c_del_adapter(&port->aux.ddc); |
| 5743 | } |
| 5744 | |
| 5745 | /** |
| 5746 | * drm_dp_mst_is_virtual_dpcd() - Is the given port a virtual DP Peer Device |
| 5747 | * @port: The port to check |
| 5748 | * |
| 5749 | * A single physical MST hub object can be represented in the topology |
| 5750 | * by multiple branches, with virtual ports between those branches. |
| 5751 | * |
| 5752 | * As of DP1.4, An MST hub with internal (virtual) ports must expose |
| 5753 | * certain DPCD registers over those ports. See sections 2.6.1.1.1 |
| 5754 | * and 2.6.1.1.2 of Display Port specification v1.4 for details. |
| 5755 | * |
| 5756 | * May acquire mgr->lock |
| 5757 | * |
| 5758 | * Returns: |
| 5759 | * true if the port is a virtual DP peer device, false otherwise |
| 5760 | */ |
| 5761 | static bool_Bool drm_dp_mst_is_virtual_dpcd(struct drm_dp_mst_port *port) |
| 5762 | { |
| 5763 | struct drm_dp_mst_port *downstream_port; |
| 5764 | |
| 5765 | if (!port || port->dpcd_rev < DP_DPCD_REV_140x14) |
| 5766 | return false0; |
| 5767 | |
| 5768 | /* Virtual DP Sink (Internal Display Panel) */ |
| 5769 | if (port->port_num >= 8) |
| 5770 | return true1; |
| 5771 | |
| 5772 | /* DP-to-HDMI Protocol Converter */ |
| 5773 | if (port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV0x4 && |
| 5774 | !port->mcs && |
| 5775 | port->ldps) |
| 5776 | return true1; |
| 5777 | |
| 5778 | /* DP-to-DP */ |
| 5779 | mutex_lock(&port->mgr->lock)rw_enter_write(&port->mgr->lock); |
| 5780 | if (port->pdt == DP_PEER_DEVICE_MST_BRANCHING0x2 && |
| 5781 | port->mstb && |
| 5782 | port->mstb->num_ports == 2) { |
| 5783 | list_for_each_entry(downstream_port, &port->mstb->ports, next)for (downstream_port = ({ const __typeof( ((__typeof(*downstream_port ) *)0)->next ) *__mptr = ((&port->mstb->ports)-> next); (__typeof(*downstream_port) *)( (char *)__mptr - __builtin_offsetof (__typeof(*downstream_port), next) );}); &downstream_port ->next != (&port->mstb->ports); downstream_port = ({ const __typeof( ((__typeof(*downstream_port) *)0)->next ) *__mptr = (downstream_port->next.next); (__typeof(*downstream_port ) *)( (char *)__mptr - __builtin_offsetof(__typeof(*downstream_port ), next) );})) { |
| 5784 | if (downstream_port->pdt == DP_PEER_DEVICE_SST_SINK0x3 && |
| 5785 | !downstream_port->input) { |
| 5786 | mutex_unlock(&port->mgr->lock)rw_exit_write(&port->mgr->lock); |
| 5787 | return true1; |
| 5788 | } |
| 5789 | } |
| 5790 | } |
| 5791 | mutex_unlock(&port->mgr->lock)rw_exit_write(&port->mgr->lock); |
| 5792 | |
| 5793 | return false0; |
| 5794 | } |
| 5795 | |
| 5796 | /** |
| 5797 | * drm_dp_mst_dsc_aux_for_port() - Find the correct aux for DSC |
| 5798 | * @port: The port to check. A leaf of the MST tree with an attached display. |
| 5799 | * |
| 5800 | * Depending on the situation, DSC may be enabled via the endpoint aux, |
| 5801 | * the immediately upstream aux, or the connector's physical aux. |
| 5802 | * |
| 5803 | * This is both the correct aux to read DSC_CAPABILITY and the |
| 5804 | * correct aux to write DSC_ENABLED. |
| 5805 | * |
| 5806 | * This operation can be expensive (up to four aux reads), so |
| 5807 | * the caller should cache the return. |
| 5808 | * |
| 5809 | * Returns: |
| 5810 | * NULL if DSC cannot be enabled on this port, otherwise the aux device |
| 5811 | */ |
| 5812 | struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port) |
| 5813 | { |
| 5814 | struct drm_dp_mst_port *immediate_upstream_port; |
| 5815 | struct drm_dp_mst_port *fec_port; |
| 5816 | struct drm_dp_desc desc = {}; |
| 5817 | u8 endpoint_fec; |
| 5818 | u8 endpoint_dsc; |
| 5819 | |
| 5820 | if (!port) |
| 5821 | return NULL((void *)0); |
| 5822 | |
| 5823 | if (port->parent->port_parent) |
| 5824 | immediate_upstream_port = port->parent->port_parent; |
| 5825 | else |
| 5826 | immediate_upstream_port = NULL((void *)0); |
| 5827 | |
| 5828 | fec_port = immediate_upstream_port; |
| 5829 | while (fec_port) { |
| 5830 | /* |
| 5831 | * Each physical link (i.e. not a virtual port) between the |
| 5832 | * output and the primary device must support FEC |
| 5833 | */ |
| 5834 | if (!drm_dp_mst_is_virtual_dpcd(fec_port) && |
| 5835 | !fec_port->fec_capable) |
| 5836 | return NULL((void *)0); |
| 5837 | |
| 5838 | fec_port = fec_port->parent->port_parent; |
| 5839 | } |
| 5840 | |
| 5841 | /* DP-to-DP peer device */ |
| 5842 | if (drm_dp_mst_is_virtual_dpcd(immediate_upstream_port)) { |
| 5843 | u8 upstream_dsc; |
| 5844 | |
| 5845 | if (drm_dp_dpcd_read(&port->aux, |
| 5846 | DP_DSC_SUPPORT0x060, &endpoint_dsc, 1) != 1) |
| 5847 | return NULL((void *)0); |
| 5848 | if (drm_dp_dpcd_read(&port->aux, |
| 5849 | DP_FEC_CAPABILITY0x090, &endpoint_fec, 1) != 1) |
| 5850 | return NULL((void *)0); |
| 5851 | if (drm_dp_dpcd_read(&immediate_upstream_port->aux, |
| 5852 | DP_DSC_SUPPORT0x060, &upstream_dsc, 1) != 1) |
| 5853 | return NULL((void *)0); |
| 5854 | |
| 5855 | /* Enpoint decompression with DP-to-DP peer device */ |
| 5856 | if ((endpoint_dsc & DP_DSC_DECOMPRESSION_IS_SUPPORTED(1 << 0)) && |
| 5857 | (endpoint_fec & DP_FEC_CAPABLE(1 << 0)) && |
| 5858 | (upstream_dsc & 0x2) /* DSC passthrough */) |
| 5859 | return &port->aux; |
| 5860 | |
| 5861 | /* Virtual DPCD decompression with DP-to-DP peer device */ |
| 5862 | return &immediate_upstream_port->aux; |
| 5863 | } |
| 5864 | |
| 5865 | /* Virtual DPCD decompression with DP-to-HDMI or Virtual DP Sink */ |
| 5866 | if (drm_dp_mst_is_virtual_dpcd(port)) |
| 5867 | return &port->aux; |
| 5868 | |
| 5869 | /* |
| 5870 | * Synaptics quirk |
| 5871 | * Applies to ports for which: |
| 5872 | * - Physical aux has Synaptics OUI |
| 5873 | * - DPv1.4 or higher |
| 5874 | * - Port is on primary branch device |
| 5875 | * - Not a VGA adapter (DP_DWN_STRM_PORT_TYPE_ANALOG) |
| 5876 | */ |
| 5877 | if (drm_dp_read_desc(port->mgr->aux, &desc, true1)) |
| 5878 | return NULL((void *)0); |
| 5879 | |
| 5880 | if (drm_dp_has_quirk(&desc, 0, |
| 5881 | DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) && |
| 5882 | port->mgr->dpcd[DP_DPCD_REV0x000] >= DP_DPCD_REV_140x14 && |
| 5883 | port->parent == port->mgr->mst_primary) { |
| 5884 | u8 downstreamport; |
| 5885 | |
| 5886 | if (drm_dp_dpcd_read(&port->aux, DP_DOWNSTREAMPORT_PRESENT0x005, |
| 5887 | &downstreamport, 1) < 0) |
| 5888 | return NULL((void *)0); |
| 5889 | |
| 5890 | if ((downstreamport & DP_DWN_STRM_PORT_PRESENT(1 << 0)) && |
| 5891 | ((downstreamport & DP_DWN_STRM_PORT_TYPE_MASK0x06) |
| 5892 | != DP_DWN_STRM_PORT_TYPE_ANALOG(1 << 1))) |
| 5893 | return port->mgr->aux; |
| 5894 | } |
| 5895 | |
| 5896 | /* |
| 5897 | * The check below verifies if the MST sink |
| 5898 | * connected to the GPU is capable of DSC - |
| 5899 | * therefore the endpoint needs to be |
| 5900 | * both DSC and FEC capable. |
| 5901 | */ |
| 5902 | if (drm_dp_dpcd_read(&port->aux, |
| 5903 | DP_DSC_SUPPORT0x060, &endpoint_dsc, 1) != 1) |
| 5904 | return NULL((void *)0); |
| 5905 | if (drm_dp_dpcd_read(&port->aux, |
| 5906 | DP_FEC_CAPABILITY0x090, &endpoint_fec, 1) != 1) |
| 5907 | return NULL((void *)0); |
| 5908 | if ((endpoint_dsc & DP_DSC_DECOMPRESSION_IS_SUPPORTED(1 << 0)) && |
| 5909 | (endpoint_fec & DP_FEC_CAPABLE(1 << 0))) |
| 5910 | return &port->aux; |
| 5911 | |
| 5912 | return NULL((void *)0); |
| 5913 | } |
| 5914 | EXPORT_SYMBOL(drm_dp_mst_dsc_aux_for_port); |