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, |