| File: | dev/pci/drm/drm_vblank.c |
| Warning: | line 1935, column 3 Value stored to 'high_prec' is never read |
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| 1 | /* |
| 2 | * drm_irq.c IRQ and vblank support |
| 3 | * |
| 4 | * \author Rickard E. (Rik) Faith <faith@valinux.com> |
| 5 | * \author Gareth Hughes <gareth@valinux.com> |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 8 | * copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation |
| 10 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 11 | * and/or sell copies of the Software, and to permit persons to whom the |
| 12 | * Software is furnished to do so, subject to the following conditions: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice (including the next |
| 15 | * paragraph) shall be included in all copies or substantial portions of the |
| 16 | * Software. |
| 17 | * |
| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 21 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| 22 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| 23 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| 24 | * OTHER DEALINGS IN THE SOFTWARE. |
| 25 | */ |
| 26 | |
| 27 | #include <linux/export.h> |
| 28 | #include <linux/kthread.h> |
| 29 | #include <linux/moduleparam.h> |
| 30 | |
| 31 | #include <drm/drm_crtc.h> |
| 32 | #include <drm/drm_drv.h> |
| 33 | #include <drm/drm_framebuffer.h> |
| 34 | #include <drm/drm_managed.h> |
| 35 | #include <drm/drm_modeset_helper_vtables.h> |
| 36 | #include <drm/drm_print.h> |
| 37 | #include <drm/drm_vblank.h> |
| 38 | |
| 39 | #include "drm_internal.h" |
| 40 | #include "drm_trace.h" |
| 41 | |
| 42 | /** |
| 43 | * DOC: vblank handling |
| 44 | * |
| 45 | * From the computer's perspective, every time the monitor displays |
| 46 | * a new frame the scanout engine has "scanned out" the display image |
| 47 | * from top to bottom, one row of pixels at a time. The current row |
| 48 | * of pixels is referred to as the current scanline. |
| 49 | * |
| 50 | * In addition to the display's visible area, there's usually a couple of |
| 51 | * extra scanlines which aren't actually displayed on the screen. |
| 52 | * These extra scanlines don't contain image data and are occasionally used |
| 53 | * for features like audio and infoframes. The region made up of these |
| 54 | * scanlines is referred to as the vertical blanking region, or vblank for |
| 55 | * short. |
| 56 | * |
| 57 | * For historical reference, the vertical blanking period was designed to |
| 58 | * give the electron gun (on CRTs) enough time to move back to the top of |
| 59 | * the screen to start scanning out the next frame. Similar for horizontal |
| 60 | * blanking periods. They were designed to give the electron gun enough |
| 61 | * time to move back to the other side of the screen to start scanning the |
| 62 | * next scanline. |
| 63 | * |
| 64 | * :: |
| 65 | * |
| 66 | * |
| 67 | * physical → ⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽ |
| 68 | * top of | | |
| 69 | * display | | |
| 70 | * | New frame | |
| 71 | * | | |
| 72 | * |↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓| |
| 73 | * |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| ← Scanline, |
| 74 | * |↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓| updates the |
| 75 | * | | frame as it |
| 76 | * | | travels down |
| 77 | * | | ("scan out") |
| 78 | * | Old frame | |
| 79 | * | | |
| 80 | * | | |
| 81 | * | | |
| 82 | * | | physical |
| 83 | * | | bottom of |
| 84 | * vertical |⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽| ← display |
| 85 | * blanking ┆xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx┆ |
| 86 | * region → ┆xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx┆ |
| 87 | * ┆xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx┆ |
| 88 | * start of → ⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽ |
| 89 | * new frame |
| 90 | * |
| 91 | * "Physical top of display" is the reference point for the high-precision/ |
| 92 | * corrected timestamp. |
| 93 | * |
| 94 | * On a lot of display hardware, programming needs to take effect during the |
| 95 | * vertical blanking period so that settings like gamma, the image buffer |
| 96 | * buffer to be scanned out, etc. can safely be changed without showing |
| 97 | * any visual artifacts on the screen. In some unforgiving hardware, some of |
| 98 | * this programming has to both start and end in the same vblank. To help |
| 99 | * with the timing of the hardware programming, an interrupt is usually |
| 100 | * available to notify the driver when it can start the updating of registers. |
| 101 | * The interrupt is in this context named the vblank interrupt. |
| 102 | * |
| 103 | * The vblank interrupt may be fired at different points depending on the |
| 104 | * hardware. Some hardware implementations will fire the interrupt when the |
| 105 | * new frame start, other implementations will fire the interrupt at different |
| 106 | * points in time. |
| 107 | * |
| 108 | * Vertical blanking plays a major role in graphics rendering. To achieve |
| 109 | * tear-free display, users must synchronize page flips and/or rendering to |
| 110 | * vertical blanking. The DRM API offers ioctls to perform page flips |
| 111 | * synchronized to vertical blanking and wait for vertical blanking. |
| 112 | * |
| 113 | * The DRM core handles most of the vertical blanking management logic, which |
| 114 | * involves filtering out spurious interrupts, keeping race-free blanking |
| 115 | * counters, coping with counter wrap-around and resets and keeping use counts. |
| 116 | * It relies on the driver to generate vertical blanking interrupts and |
| 117 | * optionally provide a hardware vertical blanking counter. |
| 118 | * |
| 119 | * Drivers must initialize the vertical blanking handling core with a call to |
| 120 | * drm_vblank_init(). Minimally, a driver needs to implement |
| 121 | * &drm_crtc_funcs.enable_vblank and &drm_crtc_funcs.disable_vblank plus call |
| 122 | * drm_crtc_handle_vblank() in its vblank interrupt handler for working vblank |
| 123 | * support. |
| 124 | * |
| 125 | * Vertical blanking interrupts can be enabled by the DRM core or by drivers |
| 126 | * themselves (for instance to handle page flipping operations). The DRM core |
| 127 | * maintains a vertical blanking use count to ensure that the interrupts are not |
| 128 | * disabled while a user still needs them. To increment the use count, drivers |
| 129 | * call drm_crtc_vblank_get() and release the vblank reference again with |
| 130 | * drm_crtc_vblank_put(). In between these two calls vblank interrupts are |
| 131 | * guaranteed to be enabled. |
| 132 | * |
| 133 | * On many hardware disabling the vblank interrupt cannot be done in a race-free |
| 134 | * manner, see &drm_driver.vblank_disable_immediate and |
| 135 | * &drm_driver.max_vblank_count. In that case the vblank core only disables the |
| 136 | * vblanks after a timer has expired, which can be configured through the |
| 137 | * ``vblankoffdelay`` module parameter. |
| 138 | * |
| 139 | * Drivers for hardware without support for vertical-blanking interrupts |
| 140 | * must not call drm_vblank_init(). For such drivers, atomic helpers will |
| 141 | * automatically generate fake vblank events as part of the display update. |
| 142 | * This functionality also can be controlled by the driver by enabling and |
| 143 | * disabling struct drm_crtc_state.no_vblank. |
| 144 | */ |
| 145 | |
| 146 | /* Retry timestamp calculation up to 3 times to satisfy |
| 147 | * drm_timestamp_precision before giving up. |
| 148 | */ |
| 149 | #define DRM_TIMESTAMP_MAXRETRIES3 3 |
| 150 | |
| 151 | /* Threshold in nanoseconds for detection of redundant |
| 152 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. |
| 153 | */ |
| 154 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS1000000 1000000 |
| 155 | |
| 156 | static bool_Bool |
| 157 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
| 158 | ktime_t *tvblank, bool_Bool in_vblank_irq); |
| 159 | |
| 160 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ |
| 161 | |
| 162 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ |
| 163 | |
| 164 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); |
| 165 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); |
| 166 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); |
| 167 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); |
| 168 | |
| 169 | static void store_vblank(struct drm_device *dev, unsigned int pipe, |
| 170 | u32 vblank_count_inc, |
| 171 | ktime_t t_vblank, u32 last) |
| 172 | { |
| 173 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 174 | |
| 175 | assert_spin_locked(&dev->vblank_time_lock)do { if (((&dev->vblank_time_lock)->mtx_owner != ({ struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})) && !(panicstr || db_active)) panic("mutex %p not held in %s" , (&dev->vblank_time_lock), __func__); } while (0); |
| 176 | |
| 177 | vblank->last = last; |
| 178 | |
| 179 | write_seqlock(&vblank->seqlock); |
| 180 | vblank->time = t_vblank; |
| 181 | atomic64_add(vblank_count_inc, &vblank->count)__sync_fetch_and_add_8(&vblank->count, vblank_count_inc ); |
| 182 | write_sequnlock(&vblank->seqlock); |
| 183 | } |
| 184 | |
| 185 | static u32 drm_max_vblank_count(struct drm_device *dev, unsigned int pipe) |
| 186 | { |
| 187 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 188 | |
| 189 | return vblank->max_vblank_count ?: dev->max_vblank_count; |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * "No hw counter" fallback implementation of .get_vblank_counter() hook, |
| 194 | * if there is no usable hardware frame counter available. |
| 195 | */ |
| 196 | static u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) |
| 197 | { |
| 198 | drm_WARN_ON_ONCE(dev, drm_max_vblank_count(dev, pipe) != 0)({ static int __warned; int __ret = !!((drm_max_vblank_count( dev, pipe) != 0)); if (__ret && !__warned) { printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON_ONCE(" "drm_max_vblank_count(dev, pipe) != 0" ")"); __warned = 1; } __builtin_expect(!!(__ret), 0); }); |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe) |
| 203 | { |
| 204 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
| 205 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
| 206 | |
| 207 | if (drm_WARN_ON(dev, !crtc)({ int __ret = !!((!crtc)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON(" "!crtc" ")"); __builtin_expect(!!(__ret), 0); })) |
| 208 | return 0; |
| 209 | |
| 210 | if (crtc->funcs->get_vblank_counter) |
| 211 | return crtc->funcs->get_vblank_counter(crtc); |
| 212 | } |
| 213 | #ifdef CONFIG_DRM_LEGACY |
| 214 | else if (dev->driver->get_vblank_counter) { |
| 215 | return dev->driver->get_vblank_counter(dev, pipe); |
| 216 | } |
| 217 | #endif |
| 218 | |
| 219 | return drm_vblank_no_hw_counter(dev, pipe); |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * Reset the stored timestamp for the current vblank count to correspond |
| 224 | * to the last vblank occurred. |
| 225 | * |
| 226 | * Only to be called from drm_crtc_vblank_on(). |
| 227 | * |
| 228 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes |
| 229 | * device vblank fields. |
| 230 | */ |
| 231 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) |
| 232 | { |
| 233 | u32 cur_vblank; |
| 234 | bool_Bool rc; |
| 235 | ktime_t t_vblank; |
| 236 | int count = DRM_TIMESTAMP_MAXRETRIES3; |
| 237 | |
| 238 | spin_lock(&dev->vblank_time_lock)mtx_enter(&dev->vblank_time_lock); |
| 239 | |
| 240 | /* |
| 241 | * sample the current counter to avoid random jumps |
| 242 | * when drm_vblank_enable() applies the diff |
| 243 | */ |
| 244 | do { |
| 245 | cur_vblank = __get_vblank_counter(dev, pipe); |
| 246 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false0); |
| 247 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); |
| 248 | |
| 249 | /* |
| 250 | * Only reinitialize corresponding vblank timestamp if high-precision query |
| 251 | * available and didn't fail. Otherwise reinitialize delayed at next vblank |
| 252 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. |
| 253 | */ |
| 254 | if (!rc) |
| 255 | t_vblank = 0; |
| 256 | |
| 257 | /* |
| 258 | * +1 to make sure user will never see the same |
| 259 | * vblank counter value before and after a modeset |
| 260 | */ |
| 261 | store_vblank(dev, pipe, 1, t_vblank, cur_vblank); |
| 262 | |
| 263 | spin_unlock(&dev->vblank_time_lock)mtx_leave(&dev->vblank_time_lock); |
| 264 | } |
| 265 | |
| 266 | /* |
| 267 | * Call back into the driver to update the appropriate vblank counter |
| 268 | * (specified by @pipe). Deal with wraparound, if it occurred, and |
| 269 | * update the last read value so we can deal with wraparound on the next |
| 270 | * call if necessary. |
| 271 | * |
| 272 | * Only necessary when going from off->on, to account for frames we |
| 273 | * didn't get an interrupt for. |
| 274 | * |
| 275 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes |
| 276 | * device vblank fields. |
| 277 | */ |
| 278 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, |
| 279 | bool_Bool in_vblank_irq) |
| 280 | { |
| 281 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 282 | u32 cur_vblank, diff; |
| 283 | bool_Bool rc; |
| 284 | ktime_t t_vblank; |
| 285 | int count = DRM_TIMESTAMP_MAXRETRIES3; |
| 286 | int framedur_ns = vblank->framedur_ns; |
| 287 | u32 max_vblank_count = drm_max_vblank_count(dev, pipe); |
| 288 | |
| 289 | /* |
| 290 | * Interrupts were disabled prior to this call, so deal with counter |
| 291 | * wrap if needed. |
| 292 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events |
| 293 | * here if the register is small or we had vblank interrupts off for |
| 294 | * a long time. |
| 295 | * |
| 296 | * We repeat the hardware vblank counter & timestamp query until |
| 297 | * we get consistent results. This to prevent races between gpu |
| 298 | * updating its hardware counter while we are retrieving the |
| 299 | * corresponding vblank timestamp. |
| 300 | */ |
| 301 | do { |
| 302 | cur_vblank = __get_vblank_counter(dev, pipe); |
| 303 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq); |
| 304 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); |
| 305 | |
| 306 | if (max_vblank_count) { |
| 307 | /* trust the hw counter when it's around */ |
| 308 | diff = (cur_vblank - vblank->last) & max_vblank_count; |
| 309 | } else if (rc && framedur_ns) { |
| 310 | u64 diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); |
| 311 | |
| 312 | /* |
| 313 | * Figure out how many vblanks we've missed based |
| 314 | * on the difference in the timestamps and the |
| 315 | * frame/field duration. |
| 316 | */ |
| 317 | |
| 318 | drm_dbg_vbl(dev, "crtc %u: Calculating number of vblanks."__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %u: Calculating number of vblanks." " diff_ns = %lld, framedur_ns = %d)\n" , pipe, (long long)diff_ns, framedur_ns) |
| 319 | " diff_ns = %lld, framedur_ns = %d)\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %u: Calculating number of vblanks." " diff_ns = %lld, framedur_ns = %d)\n" , pipe, (long long)diff_ns, framedur_ns) |
| 320 | pipe, (long long)diff_ns, framedur_ns)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %u: Calculating number of vblanks." " diff_ns = %lld, framedur_ns = %d)\n" , pipe, (long long)diff_ns, framedur_ns); |
| 321 | |
| 322 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns)(((diff_ns) + ((framedur_ns) / 2)) / (framedur_ns)); |
| 323 | |
| 324 | if (diff == 0 && in_vblank_irq) |
| 325 | drm_dbg_vbl(dev, "crtc %u: Redundant vblirq ignored\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %u: Redundant vblirq ignored\n", pipe) |
| 326 | pipe)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %u: Redundant vblirq ignored\n", pipe); |
| 327 | } else { |
| 328 | /* some kind of default for drivers w/o accurate vbl timestamping */ |
| 329 | diff = in_vblank_irq ? 1 : 0; |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset |
| 334 | * interval? If so then vblank irqs keep running and it will likely |
| 335 | * happen that the hardware vblank counter is not trustworthy as it |
| 336 | * might reset at some point in that interval and vblank timestamps |
| 337 | * are not trustworthy either in that interval. Iow. this can result |
| 338 | * in a bogus diff >> 1 which must be avoided as it would cause |
| 339 | * random large forward jumps of the software vblank counter. |
| 340 | */ |
| 341 | if (diff > 1 && (vblank->inmodeset & 0x2)) { |
| 342 | drm_dbg_vbl(dev,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "clamping vblank bump to 1 on crtc %u: diffr=%u" " due to pre-modeset.\n", pipe, diff) |
| 343 | "clamping vblank bump to 1 on crtc %u: diffr=%u"__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "clamping vblank bump to 1 on crtc %u: diffr=%u" " due to pre-modeset.\n", pipe, diff) |
| 344 | " due to pre-modeset.\n", pipe, diff)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "clamping vblank bump to 1 on crtc %u: diffr=%u" " due to pre-modeset.\n", pipe, diff); |
| 345 | diff = 1; |
| 346 | } |
| 347 | |
| 348 | drm_dbg_vbl(dev, "updating vblank count on crtc %u:"__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "updating vblank count on crtc %u:" " current=%llu, diff=%u, hw=%u hw_last=%u\n" , pipe, (unsigned long long)({ typeof(*(&vblank->count )) __tmp = *(volatile typeof(*(&vblank->count)) *)& (*(&vblank->count)); membar_datadep_consumer(); __tmp; }), diff, cur_vblank, vblank->last) |
| 349 | " current=%llu, diff=%u, hw=%u hw_last=%u\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "updating vblank count on crtc %u:" " current=%llu, diff=%u, hw=%u hw_last=%u\n" , pipe, (unsigned long long)({ typeof(*(&vblank->count )) __tmp = *(volatile typeof(*(&vblank->count)) *)& (*(&vblank->count)); membar_datadep_consumer(); __tmp; }), diff, cur_vblank, vblank->last) |
| 350 | pipe, (unsigned long long)atomic64_read(&vblank->count),__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "updating vblank count on crtc %u:" " current=%llu, diff=%u, hw=%u hw_last=%u\n" , pipe, (unsigned long long)({ typeof(*(&vblank->count )) __tmp = *(volatile typeof(*(&vblank->count)) *)& (*(&vblank->count)); membar_datadep_consumer(); __tmp; }), diff, cur_vblank, vblank->last) |
| 351 | diff, cur_vblank, vblank->last)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "updating vblank count on crtc %u:" " current=%llu, diff=%u, hw=%u hw_last=%u\n" , pipe, (unsigned long long)({ typeof(*(&vblank->count )) __tmp = *(volatile typeof(*(&vblank->count)) *)& (*(&vblank->count)); membar_datadep_consumer(); __tmp; }), diff, cur_vblank, vblank->last); |
| 352 | |
| 353 | if (diff == 0) { |
| 354 | drm_WARN_ON_ONCE(dev, cur_vblank != vblank->last)({ static int __warned; int __ret = !!((cur_vblank != vblank-> last)); if (__ret && !__warned) { printf("%s %s: " "%s" , dev_driver_string(((dev))->dev), "", "drm_WARN_ON_ONCE(" "cur_vblank != vblank->last" ")"); __warned = 1; } __builtin_expect (!!(__ret), 0); }); |
| 355 | return; |
| 356 | } |
| 357 | |
| 358 | /* |
| 359 | * Only reinitialize corresponding vblank timestamp if high-precision query |
| 360 | * available and didn't fail, or we were called from the vblank interrupt. |
| 361 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 |
| 362 | * for now, to mark the vblanktimestamp as invalid. |
| 363 | */ |
| 364 | if (!rc && !in_vblank_irq) |
| 365 | t_vblank = 0; |
| 366 | |
| 367 | store_vblank(dev, pipe, diff, t_vblank, cur_vblank); |
| 368 | } |
| 369 | |
| 370 | u64 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
| 371 | { |
| 372 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 373 | u64 count; |
| 374 | |
| 375 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
| 376 | return 0; |
| 377 | |
| 378 | count = atomic64_read(&vblank->count)({ typeof(*(&vblank->count)) __tmp = *(volatile typeof (*(&vblank->count)) *)&(*(&vblank->count)); membar_datadep_consumer(); __tmp; }); |
| 379 | |
| 380 | /* |
| 381 | * This read barrier corresponds to the implicit write barrier of the |
| 382 | * write seqlock in store_vblank(). Note that this is the only place |
| 383 | * where we need an explicit barrier, since all other access goes |
| 384 | * through drm_vblank_count_and_time(), which already has the required |
| 385 | * read barrier curtesy of the read seqlock. |
| 386 | */ |
| 387 | smp_rmb()do { __asm volatile("" ::: "memory"); } while (0); |
| 388 | |
| 389 | return count; |
| 390 | } |
| 391 | |
| 392 | /** |
| 393 | * drm_crtc_accurate_vblank_count - retrieve the master vblank counter |
| 394 | * @crtc: which counter to retrieve |
| 395 | * |
| 396 | * This function is similar to drm_crtc_vblank_count() but this function |
| 397 | * interpolates to handle a race with vblank interrupts using the high precision |
| 398 | * timestamping support. |
| 399 | * |
| 400 | * This is mostly useful for hardware that can obtain the scanout position, but |
| 401 | * doesn't have a hardware frame counter. |
| 402 | */ |
| 403 | u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc) |
| 404 | { |
| 405 | struct drm_device *dev = crtc->dev; |
| 406 | unsigned int pipe = drm_crtc_index(crtc); |
| 407 | u64 vblank; |
| 408 | unsigned long flags; |
| 409 | |
| 410 | drm_WARN_ONCE(dev, drm_debug_enabled(DRM_UT_VBL) &&({ static int __warned; int __ret = !!(drm_debug_enabled_raw( DRM_UT_VBL) && !crtc->funcs->get_vblank_timestamp ); if (__ret && !__warned) { printf("%s %s: " "This function requires support for accurate vblank timestamps." , dev_driver_string((dev)->dev), ""); __warned = 1; } __builtin_expect (!!(__ret), 0); }) |
| 411 | !crtc->funcs->get_vblank_timestamp,({ static int __warned; int __ret = !!(drm_debug_enabled_raw( DRM_UT_VBL) && !crtc->funcs->get_vblank_timestamp ); if (__ret && !__warned) { printf("%s %s: " "This function requires support for accurate vblank timestamps." , dev_driver_string((dev)->dev), ""); __warned = 1; } __builtin_expect (!!(__ret), 0); }) |
| 412 | "This function requires support for accurate vblank timestamps.")({ static int __warned; int __ret = !!(drm_debug_enabled_raw( DRM_UT_VBL) && !crtc->funcs->get_vblank_timestamp ); if (__ret && !__warned) { printf("%s %s: " "This function requires support for accurate vblank timestamps." , dev_driver_string((dev)->dev), ""); __warned = 1; } __builtin_expect (!!(__ret), 0); }); |
| 413 | |
| 414 | spin_lock_irqsave(&dev->vblank_time_lock, flags)do { flags = 0; mtx_enter(&dev->vblank_time_lock); } while (0); |
| 415 | |
| 416 | drm_update_vblank_count(dev, pipe, false0); |
| 417 | vblank = drm_vblank_count(dev, pipe); |
| 418 | |
| 419 | spin_unlock_irqrestore(&dev->vblank_time_lock, flags)do { (void)(flags); mtx_leave(&dev->vblank_time_lock); } while (0); |
| 420 | |
| 421 | return vblank; |
| 422 | } |
| 423 | EXPORT_SYMBOL(drm_crtc_accurate_vblank_count); |
| 424 | |
| 425 | static void __disable_vblank(struct drm_device *dev, unsigned int pipe) |
| 426 | { |
| 427 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
| 428 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
| 429 | |
| 430 | if (drm_WARN_ON(dev, !crtc)({ int __ret = !!((!crtc)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON(" "!crtc" ")"); __builtin_expect(!!(__ret), 0); })) |
| 431 | return; |
| 432 | |
| 433 | if (crtc->funcs->disable_vblank) |
| 434 | crtc->funcs->disable_vblank(crtc); |
| 435 | } |
| 436 | #ifdef CONFIG_DRM_LEGACY |
| 437 | else { |
| 438 | dev->driver->disable_vblank(dev, pipe); |
| 439 | } |
| 440 | #endif |
| 441 | } |
| 442 | |
| 443 | /* |
| 444 | * Disable vblank irq's on crtc, make sure that last vblank count |
| 445 | * of hardware and corresponding consistent software vblank counter |
| 446 | * are preserved, even if there are any spurious vblank irq's after |
| 447 | * disable. |
| 448 | */ |
| 449 | void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) |
| 450 | { |
| 451 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 452 | unsigned long irqflags; |
| 453 | |
| 454 | assert_spin_locked(&dev->vbl_lock)do { if (((&dev->vbl_lock)->mtx_owner != ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof (struct cpu_info, ci_self))); __ci;})) && !(panicstr || db_active)) panic("mutex %p not held in %s", (&dev->vbl_lock ), __func__); } while (0); |
| 455 | |
| 456 | /* Prevent vblank irq processing while disabling vblank irqs, |
| 457 | * so no updates of timestamps or count can happen after we've |
| 458 | * disabled. Needed to prevent races in case of delayed irq's. |
| 459 | */ |
| 460 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags)do { irqflags = 0; mtx_enter(&dev->vblank_time_lock); } while (0); |
| 461 | |
| 462 | /* |
| 463 | * Update vblank count and disable vblank interrupts only if the |
| 464 | * interrupts were enabled. This avoids calling the ->disable_vblank() |
| 465 | * operation in atomic context with the hardware potentially runtime |
| 466 | * suspended. |
| 467 | */ |
| 468 | if (!vblank->enabled) |
| 469 | goto out; |
| 470 | |
| 471 | /* |
| 472 | * Update the count and timestamp to maintain the |
| 473 | * appearance that the counter has been ticking all along until |
| 474 | * this time. This makes the count account for the entire time |
| 475 | * between drm_crtc_vblank_on() and drm_crtc_vblank_off(). |
| 476 | */ |
| 477 | drm_update_vblank_count(dev, pipe, false0); |
| 478 | __disable_vblank(dev, pipe); |
| 479 | vblank->enabled = false0; |
| 480 | |
| 481 | out: |
| 482 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags)do { (void)(irqflags); mtx_leave(&dev->vblank_time_lock ); } while (0); |
| 483 | } |
| 484 | |
| 485 | static void vblank_disable_fn(void *arg) |
| 486 | { |
| 487 | struct drm_vblank_crtc *vblank = arg; |
| 488 | struct drm_device *dev = vblank->dev; |
| 489 | unsigned int pipe = vblank->pipe; |
| 490 | unsigned long irqflags; |
| 491 | |
| 492 | spin_lock_irqsave(&dev->vbl_lock, irqflags)do { irqflags = 0; mtx_enter(&dev->vbl_lock); } while ( 0); |
| 493 | if (atomic_read(&vblank->refcount)({ typeof(*(&vblank->refcount)) __tmp = *(volatile typeof (*(&vblank->refcount)) *)&(*(&vblank->refcount )); membar_datadep_consumer(); __tmp; }) == 0 && vblank->enabled) { |
| 494 | drm_dbg_core(dev, "disabling vblank on crtc %u\n", pipe)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "disabling vblank on crtc %u\n", pipe); |
| 495 | drm_vblank_disable_and_save(dev, pipe); |
| 496 | } |
| 497 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags)do { (void)(irqflags); mtx_leave(&dev->vbl_lock); } while (0); |
| 498 | } |
| 499 | |
| 500 | static void drm_vblank_init_release(struct drm_device *dev, void *ptr) |
| 501 | { |
| 502 | struct drm_vblank_crtc *vblank = ptr; |
| 503 | |
| 504 | drm_WARN_ON(dev, READ_ONCE(vblank->enabled) &&({ int __ret = !!((({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }) && drm_core_check_feature(dev, DRIVER_MODESET ))); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev ))->dev), "", "drm_WARN_ON(" "({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled); membar_datadep_consumer(); __tmp; }) && drm_core_check_feature(dev, DRIVER_MODESET)" ")"); __builtin_expect(!!(__ret), 0); }) |
| 505 | drm_core_check_feature(dev, DRIVER_MODESET))({ int __ret = !!((({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }) && drm_core_check_feature(dev, DRIVER_MODESET ))); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev ))->dev), "", "drm_WARN_ON(" "({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled); membar_datadep_consumer(); __tmp; }) && drm_core_check_feature(dev, DRIVER_MODESET)" ")"); __builtin_expect(!!(__ret), 0); }); |
| 506 | |
| 507 | drm_vblank_destroy_worker(vblank); |
| 508 | del_timer_sync(&vblank->disable_timer)timeout_del_barrier((&vblank->disable_timer)); |
| 509 | } |
| 510 | |
| 511 | /** |
| 512 | * drm_vblank_init - initialize vblank support |
| 513 | * @dev: DRM device |
| 514 | * @num_crtcs: number of CRTCs supported by @dev |
| 515 | * |
| 516 | * This function initializes vblank support for @num_crtcs display pipelines. |
| 517 | * Cleanup is handled automatically through a cleanup function added with |
| 518 | * drmm_add_action_or_reset(). |
| 519 | * |
| 520 | * Returns: |
| 521 | * Zero on success or a negative error code on failure. |
| 522 | */ |
| 523 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) |
| 524 | { |
| 525 | int ret; |
| 526 | unsigned int i; |
| 527 | |
| 528 | mtx_init(&dev->vbl_lock, IPL_TTY)do { (void)(((void *)0)); (void)(0); __mtx_init((&dev-> vbl_lock), ((((0x9)) > 0x0 && ((0x9)) < 0x9) ? 0x9 : ((0x9)))); } while (0); |
| 529 | mtx_init(&dev->vblank_time_lock, IPL_TTY)do { (void)(((void *)0)); (void)(0); __mtx_init((&dev-> vblank_time_lock), ((((0x9)) > 0x0 && ((0x9)) < 0x9) ? 0x9 : ((0x9)))); } while (0); |
| 530 | |
| 531 | dev->vblank = drmm_kcalloc(dev, num_crtcs, sizeof(*dev->vblank), GFP_KERNEL(0x0001 | 0x0004)); |
| 532 | if (!dev->vblank) |
| 533 | return -ENOMEM12; |
| 534 | |
| 535 | dev->num_crtcs = num_crtcs; |
| 536 | |
| 537 | for (i = 0; i < num_crtcs; i++) { |
| 538 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
| 539 | |
| 540 | vblank->dev = dev; |
| 541 | vblank->pipe = i; |
| 542 | init_waitqueue_head(&vblank->queue); |
| 543 | #ifdef __linux__ |
| 544 | timer_setup(&vblank->disable_timer, vblank_disable_fn, 0); |
| 545 | #else |
| 546 | timeout_set(&vblank->disable_timer, vblank_disable_fn, vblank); |
| 547 | #endif |
| 548 | seqlock_init(&vblank->seqlock, IPL_TTY0x9); |
| 549 | |
| 550 | ret = drmm_add_action_or_reset(dev, drm_vblank_init_release, |
| 551 | vblank); |
| 552 | if (ret) |
| 553 | return ret; |
| 554 | |
| 555 | ret = drm_vblank_worker_init(vblank); |
| 556 | if (ret) |
| 557 | return ret; |
| 558 | } |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | EXPORT_SYMBOL(drm_vblank_init); |
| 563 | |
| 564 | /** |
| 565 | * drm_dev_has_vblank - test if vblanking has been initialized for |
| 566 | * a device |
| 567 | * @dev: the device |
| 568 | * |
| 569 | * Drivers may call this function to test if vblank support is |
| 570 | * initialized for a device. For most hardware this means that vblanking |
| 571 | * can also be enabled. |
| 572 | * |
| 573 | * Atomic helpers use this function to initialize |
| 574 | * &drm_crtc_state.no_vblank. See also drm_atomic_helper_check_modeset(). |
| 575 | * |
| 576 | * Returns: |
| 577 | * True if vblanking has been initialized for the given device, false |
| 578 | * otherwise. |
| 579 | */ |
| 580 | bool_Bool drm_dev_has_vblank(const struct drm_device *dev) |
| 581 | { |
| 582 | return dev->num_crtcs != 0; |
| 583 | } |
| 584 | EXPORT_SYMBOL(drm_dev_has_vblank); |
| 585 | |
| 586 | /** |
| 587 | * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC |
| 588 | * @crtc: which CRTC's vblank waitqueue to retrieve |
| 589 | * |
| 590 | * This function returns a pointer to the vblank waitqueue for the CRTC. |
| 591 | * Drivers can use this to implement vblank waits using wait_event() and related |
| 592 | * functions. |
| 593 | */ |
| 594 | wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc) |
| 595 | { |
| 596 | return &crtc->dev->vblank[drm_crtc_index(crtc)].queue; |
| 597 | } |
| 598 | EXPORT_SYMBOL(drm_crtc_vblank_waitqueue); |
| 599 | |
| 600 | |
| 601 | /** |
| 602 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
| 603 | * @crtc: drm_crtc whose timestamp constants should be updated. |
| 604 | * @mode: display mode containing the scanout timings |
| 605 | * |
| 606 | * Calculate and store various constants which are later needed by vblank and |
| 607 | * swap-completion timestamping, e.g, by |
| 608 | * drm_crtc_vblank_helper_get_vblank_timestamp(). They are derived from |
| 609 | * CRTC's true scanout timing, so they take things like panel scaling or |
| 610 | * other adjustments into account. |
| 611 | */ |
| 612 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
| 613 | const struct drm_display_mode *mode) |
| 614 | { |
| 615 | struct drm_device *dev = crtc->dev; |
| 616 | unsigned int pipe = drm_crtc_index(crtc); |
| 617 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 618 | int linedur_ns = 0, framedur_ns = 0; |
| 619 | int dotclock = mode->crtc_clock; |
| 620 | |
| 621 | if (!drm_dev_has_vblank(dev)) |
| 622 | return; |
| 623 | |
| 624 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
| 625 | return; |
| 626 | |
| 627 | /* Valid dotclock? */ |
| 628 | if (dotclock > 0) { |
| 629 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
| 630 | |
| 631 | /* |
| 632 | * Convert scanline length in pixels and video |
| 633 | * dot clock to line duration and frame duration |
| 634 | * in nanoseconds: |
| 635 | */ |
| 636 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); |
| 637 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); |
| 638 | |
| 639 | /* |
| 640 | * Fields of interlaced scanout modes are only half a frame duration. |
| 641 | */ |
| 642 | if (mode->flags & DRM_MODE_FLAG_INTERLACE(1<<4)) |
| 643 | framedur_ns /= 2; |
| 644 | } else { |
| 645 | drm_err(dev, "crtc %u: Can't calculate constants, dotclock = 0!\n",printf("drm:pid%d:%s *ERROR* " "[drm] " "*ERROR* " "crtc %u: Can't calculate constants, dotclock = 0!\n" , ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc->p_p->ps_pid, __func__ , crtc-> base.id) |
| 646 | crtc->base.id)printf("drm:pid%d:%s *ERROR* " "[drm] " "*ERROR* " "crtc %u: Can't calculate constants, dotclock = 0!\n" , ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc->p_p->ps_pid, __func__ , crtc-> base.id); |
| 647 | } |
| 648 | |
| 649 | vblank->linedur_ns = linedur_ns; |
| 650 | vblank->framedur_ns = framedur_ns; |
| 651 | drm_mode_copy(&vblank->hwmode, mode); |
| 652 | |
| 653 | drm_dbg_core(dev,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n" , crtc->base.id, mode->crtc_htotal, mode->crtc_vtotal , mode->crtc_vdisplay) |
| 654 | "crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n" , crtc->base.id, mode->crtc_htotal, mode->crtc_vtotal , mode->crtc_vdisplay) |
| 655 | crtc->base.id, mode->crtc_htotal,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n" , crtc->base.id, mode->crtc_htotal, mode->crtc_vtotal , mode->crtc_vdisplay) |
| 656 | mode->crtc_vtotal, mode->crtc_vdisplay)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n" , crtc->base.id, mode->crtc_htotal, mode->crtc_vtotal , mode->crtc_vdisplay); |
| 657 | drm_dbg_core(dev, "crtc %u: clock %d kHz framedur %d linedur %d\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u: clock %d kHz framedur %d linedur %d\n" , crtc->base.id, dotclock, framedur_ns, linedur_ns) |
| 658 | crtc->base.id, dotclock, framedur_ns, linedur_ns)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u: clock %d kHz framedur %d linedur %d\n" , crtc->base.id, dotclock, framedur_ns, linedur_ns); |
| 659 | } |
| 660 | EXPORT_SYMBOL(drm_calc_timestamping_constants); |
| 661 | |
| 662 | /** |
| 663 | * drm_crtc_vblank_helper_get_vblank_timestamp_internal - precise vblank |
| 664 | * timestamp helper |
| 665 | * @crtc: CRTC whose vblank timestamp to retrieve |
| 666 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
| 667 | * On return contains true maximum error of timestamp |
| 668 | * @vblank_time: Pointer to time which should receive the timestamp |
| 669 | * @in_vblank_irq: |
| 670 | * True when called from drm_crtc_handle_vblank(). Some drivers |
| 671 | * need to apply some workarounds for gpu-specific vblank irq quirks |
| 672 | * if flag is set. |
| 673 | * @get_scanout_position: |
| 674 | * Callback function to retrieve the scanout position. See |
| 675 | * @struct drm_crtc_helper_funcs.get_scanout_position. |
| 676 | * |
| 677 | * Implements calculation of exact vblank timestamps from given drm_display_mode |
| 678 | * timings and current video scanout position of a CRTC. |
| 679 | * |
| 680 | * The current implementation only handles standard video modes. For double scan |
| 681 | * and interlaced modes the driver is supposed to adjust the hardware mode |
| 682 | * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to |
| 683 | * match the scanout position reported. |
| 684 | * |
| 685 | * Note that atomic drivers must call drm_calc_timestamping_constants() before |
| 686 | * enabling a CRTC. The atomic helpers already take care of that in |
| 687 | * drm_atomic_helper_calc_timestamping_constants(). |
| 688 | * |
| 689 | * Returns: |
| 690 | * |
| 691 | * Returns true on success, and false on failure, i.e. when no accurate |
| 692 | * timestamp could be acquired. |
| 693 | */ |
| 694 | bool_Bool |
| 695 | drm_crtc_vblank_helper_get_vblank_timestamp_internal( |
| 696 | struct drm_crtc *crtc, int *max_error, ktime_t *vblank_time, |
| 697 | bool_Bool in_vblank_irq, |
| 698 | drm_vblank_get_scanout_position_func get_scanout_position) |
| 699 | { |
| 700 | struct drm_device *dev = crtc->dev; |
| 701 | unsigned int pipe = crtc->index; |
| 702 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 703 | struct timespec64 ts_etime, ts_vblank_time; |
| 704 | ktime_t stime, etime; |
| 705 | bool_Bool vbl_status; |
| 706 | const struct drm_display_mode *mode; |
| 707 | int vpos, hpos, i; |
| 708 | int delta_ns, duration_ns; |
| 709 | |
| 710 | if (pipe >= dev->num_crtcs) { |
| 711 | drm_err(dev, "Invalid crtc %u\n", pipe)printf("drm:pid%d:%s *ERROR* " "[drm] " "*ERROR* " "Invalid crtc %u\n" , ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc->p_p->ps_pid, __func__ , pipe); |
| 712 | return false0; |
| 713 | } |
| 714 | |
| 715 | /* Scanout position query not supported? Should not happen. */ |
| 716 | if (!get_scanout_position) { |
| 717 | drm_err(dev, "Called from CRTC w/o get_scanout_position()!?\n")printf("drm:pid%d:%s *ERROR* " "[drm] " "*ERROR* " "Called from CRTC w/o get_scanout_position()!?\n" , ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc->p_p->ps_pid, __func__); |
| 718 | return false0; |
| 719 | } |
| 720 | |
| 721 | if (drm_drv_uses_atomic_modeset(dev)) |
| 722 | mode = &vblank->hwmode; |
| 723 | else |
| 724 | mode = &crtc->hwmode; |
| 725 | |
| 726 | /* If mode timing undefined, just return as no-op: |
| 727 | * Happens during initial modesetting of a crtc. |
| 728 | */ |
| 729 | if (mode->crtc_clock == 0) { |
| 730 | drm_dbg_core(dev, "crtc %u: Noop due to uninitialized mode.\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u: Noop due to uninitialized mode.\n", pipe) |
| 731 | pipe)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u: Noop due to uninitialized mode.\n", pipe); |
| 732 | drm_WARN_ON_ONCE(dev, drm_drv_uses_atomic_modeset(dev))({ static int __warned; int __ret = !!((drm_drv_uses_atomic_modeset (dev))); if (__ret && !__warned) { printf("%s %s: " "%s" , dev_driver_string(((dev))->dev), "", "drm_WARN_ON_ONCE(" "drm_drv_uses_atomic_modeset(dev)" ")"); __warned = 1; } __builtin_expect (!!(__ret), 0); }); |
| 733 | return false0; |
| 734 | } |
| 735 | |
| 736 | /* Get current scanout position with system timestamp. |
| 737 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times |
| 738 | * if single query takes longer than max_error nanoseconds. |
| 739 | * |
| 740 | * This guarantees a tight bound on maximum error if |
| 741 | * code gets preempted or delayed for some reason. |
| 742 | */ |
| 743 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES3; i++) { |
| 744 | /* |
| 745 | * Get vertical and horizontal scanout position vpos, hpos, |
| 746 | * and bounding timestamps stime, etime, pre/post query. |
| 747 | */ |
| 748 | vbl_status = get_scanout_position(crtc, in_vblank_irq, |
| 749 | &vpos, &hpos, |
| 750 | &stime, &etime, |
| 751 | mode); |
| 752 | |
| 753 | /* Return as no-op if scanout query unsupported or failed. */ |
| 754 | if (!vbl_status) { |
| 755 | drm_dbg_core(dev,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u : scanoutpos query failed.\n", pipe) |
| 756 | "crtc %u : scanoutpos query failed.\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u : scanoutpos query failed.\n", pipe) |
| 757 | pipe)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u : scanoutpos query failed.\n", pipe); |
| 758 | return false0; |
| 759 | } |
| 760 | |
| 761 | /* Compute uncertainty in timestamp of scanout position query. */ |
| 762 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
| 763 | |
| 764 | /* Accept result with < max_error nsecs timing uncertainty. */ |
| 765 | if (duration_ns <= *max_error) |
| 766 | break; |
| 767 | } |
| 768 | |
| 769 | /* Noisy system timing? */ |
| 770 | if (i == DRM_TIMESTAMP_MAXRETRIES3) { |
| 771 | drm_dbg_core(dev,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u: Noisy timestamp %d us > %d us [%d reps].\n" , pipe, duration_ns / 1000, *max_error / 1000, i) |
| 772 | "crtc %u: Noisy timestamp %d us > %d us [%d reps].\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u: Noisy timestamp %d us > %d us [%d reps].\n" , pipe, duration_ns / 1000, *max_error / 1000, i) |
| 773 | pipe, duration_ns / 1000, *max_error / 1000, i)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %u: Noisy timestamp %d us > %d us [%d reps].\n" , pipe, duration_ns / 1000, *max_error / 1000, i); |
| 774 | } |
| 775 | |
| 776 | /* Return upper bound of timestamp precision error. */ |
| 777 | *max_error = duration_ns; |
| 778 | |
| 779 | /* Convert scanout position into elapsed time at raw_time query |
| 780 | * since start of scanout at first display scanline. delta_ns |
| 781 | * can be negative if start of scanout hasn't happened yet. |
| 782 | */ |
| 783 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), |
| 784 | mode->crtc_clock); |
| 785 | |
| 786 | /* Subtract time delta from raw timestamp to get final |
| 787 | * vblank_time timestamp for end of vblank. |
| 788 | */ |
| 789 | *vblank_time = ktime_sub_ns(etime, delta_ns); |
| 790 | |
| 791 | if (!drm_debug_enabled(DRM_UT_VBL)drm_debug_enabled_raw(DRM_UT_VBL)) |
| 792 | return true1; |
| 793 | |
| 794 | ts_etime = ktime_to_timespec64(etime); |
| 795 | ts_vblank_time = ktime_to_timespec64(*vblank_time); |
| 796 | |
| 797 | drm_dbg_vbl(dev,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n" , pipe, hpos, vpos, (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000 , (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, duration_ns / 1000, i) |
| 798 | "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n" , pipe, hpos, vpos, (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000 , (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, duration_ns / 1000, i) |
| 799 | pipe, hpos, vpos,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n" , pipe, hpos, vpos, (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000 , (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, duration_ns / 1000, i) |
| 800 | (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n" , pipe, hpos, vpos, (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000 , (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, duration_ns / 1000, i) |
| 801 | (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n" , pipe, hpos, vpos, (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000 , (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, duration_ns / 1000, i) |
| 802 | duration_ns / 1000, i)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n" , pipe, hpos, vpos, (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000 , (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, duration_ns / 1000, i); |
| 803 | |
| 804 | return true1; |
| 805 | } |
| 806 | EXPORT_SYMBOL(drm_crtc_vblank_helper_get_vblank_timestamp_internal); |
| 807 | |
| 808 | /** |
| 809 | * drm_crtc_vblank_helper_get_vblank_timestamp - precise vblank timestamp |
| 810 | * helper |
| 811 | * @crtc: CRTC whose vblank timestamp to retrieve |
| 812 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
| 813 | * On return contains true maximum error of timestamp |
| 814 | * @vblank_time: Pointer to time which should receive the timestamp |
| 815 | * @in_vblank_irq: |
| 816 | * True when called from drm_crtc_handle_vblank(). Some drivers |
| 817 | * need to apply some workarounds for gpu-specific vblank irq quirks |
| 818 | * if flag is set. |
| 819 | * |
| 820 | * Implements calculation of exact vblank timestamps from given drm_display_mode |
| 821 | * timings and current video scanout position of a CRTC. This can be directly |
| 822 | * used as the &drm_crtc_funcs.get_vblank_timestamp implementation of a kms |
| 823 | * driver if &drm_crtc_helper_funcs.get_scanout_position is implemented. |
| 824 | * |
| 825 | * The current implementation only handles standard video modes. For double scan |
| 826 | * and interlaced modes the driver is supposed to adjust the hardware mode |
| 827 | * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to |
| 828 | * match the scanout position reported. |
| 829 | * |
| 830 | * Note that atomic drivers must call drm_calc_timestamping_constants() before |
| 831 | * enabling a CRTC. The atomic helpers already take care of that in |
| 832 | * drm_atomic_helper_calc_timestamping_constants(). |
| 833 | * |
| 834 | * Returns: |
| 835 | * |
| 836 | * Returns true on success, and false on failure, i.e. when no accurate |
| 837 | * timestamp could be acquired. |
| 838 | */ |
| 839 | bool_Bool drm_crtc_vblank_helper_get_vblank_timestamp(struct drm_crtc *crtc, |
| 840 | int *max_error, |
| 841 | ktime_t *vblank_time, |
| 842 | bool_Bool in_vblank_irq) |
| 843 | { |
| 844 | return drm_crtc_vblank_helper_get_vblank_timestamp_internal( |
| 845 | crtc, max_error, vblank_time, in_vblank_irq, |
| 846 | crtc->helper_private->get_scanout_position); |
| 847 | } |
| 848 | EXPORT_SYMBOL(drm_crtc_vblank_helper_get_vblank_timestamp); |
| 849 | |
| 850 | /** |
| 851 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent |
| 852 | * vblank interval |
| 853 | * @dev: DRM device |
| 854 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
| 855 | * @tvblank: Pointer to target time which should receive the timestamp |
| 856 | * @in_vblank_irq: |
| 857 | * True when called from drm_crtc_handle_vblank(). Some drivers |
| 858 | * need to apply some workarounds for gpu-specific vblank irq quirks |
| 859 | * if flag is set. |
| 860 | * |
| 861 | * Fetches the system timestamp corresponding to the time of the most recent |
| 862 | * vblank interval on specified CRTC. May call into kms-driver to |
| 863 | * compute the timestamp with a high-precision GPU specific method. |
| 864 | * |
| 865 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() |
| 866 | * call, i.e., it isn't very precisely locked to the true vblank. |
| 867 | * |
| 868 | * Returns: |
| 869 | * True if timestamp is considered to be very precise, false otherwise. |
| 870 | */ |
| 871 | static bool_Bool |
| 872 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
| 873 | ktime_t *tvblank, bool_Bool in_vblank_irq) |
| 874 | { |
| 875 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
| 876 | bool_Bool ret = false0; |
| 877 | |
| 878 | /* Define requested maximum error on timestamps (nanoseconds). */ |
| 879 | int max_error = (int) drm_timestamp_precision * 1000; |
| 880 | |
| 881 | /* Query driver if possible and precision timestamping enabled. */ |
| 882 | if (crtc && crtc->funcs->get_vblank_timestamp && max_error > 0) { |
| 883 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
| 884 | |
| 885 | ret = crtc->funcs->get_vblank_timestamp(crtc, &max_error, |
| 886 | tvblank, in_vblank_irq); |
| 887 | } |
| 888 | |
| 889 | /* GPU high precision timestamp query unsupported or failed. |
| 890 | * Return current monotonic/gettimeofday timestamp as best estimate. |
| 891 | */ |
| 892 | if (!ret) |
| 893 | *tvblank = ktime_get(); |
| 894 | |
| 895 | return ret; |
| 896 | } |
| 897 | |
| 898 | /** |
| 899 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value |
| 900 | * @crtc: which counter to retrieve |
| 901 | * |
| 902 | * Fetches the "cooked" vblank count value that represents the number of |
| 903 | * vblank events since the system was booted, including lost events due to |
| 904 | * modesetting activity. Note that this timer isn't correct against a racing |
| 905 | * vblank interrupt (since it only reports the software vblank counter), see |
| 906 | * drm_crtc_accurate_vblank_count() for such use-cases. |
| 907 | * |
| 908 | * Note that for a given vblank counter value drm_crtc_handle_vblank() |
| 909 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() |
| 910 | * provide a barrier: Any writes done before calling |
| 911 | * drm_crtc_handle_vblank() will be visible to callers of the later |
| 912 | * functions, if the vblank count is the same or a later one. |
| 913 | * |
| 914 | * See also &drm_vblank_crtc.count. |
| 915 | * |
| 916 | * Returns: |
| 917 | * The software vblank counter. |
| 918 | */ |
| 919 | u64 drm_crtc_vblank_count(struct drm_crtc *crtc) |
| 920 | { |
| 921 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); |
| 922 | } |
| 923 | EXPORT_SYMBOL(drm_crtc_vblank_count); |
| 924 | |
| 925 | /** |
| 926 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the |
| 927 | * system timestamp corresponding to that vblank counter value. |
| 928 | * @dev: DRM device |
| 929 | * @pipe: index of CRTC whose counter to retrieve |
| 930 | * @vblanktime: Pointer to ktime_t to receive the vblank timestamp. |
| 931 | * |
| 932 | * Fetches the "cooked" vblank count value that represents the number of |
| 933 | * vblank events since the system was booted, including lost events due to |
| 934 | * modesetting activity. Returns corresponding system timestamp of the time |
| 935 | * of the vblank interval that corresponds to the current vblank counter value. |
| 936 | * |
| 937 | * This is the legacy version of drm_crtc_vblank_count_and_time(). |
| 938 | */ |
| 939 | static u64 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, |
| 940 | ktime_t *vblanktime) |
| 941 | { |
| 942 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 943 | u64 vblank_count; |
| 944 | unsigned int seq; |
| 945 | |
| 946 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) { |
| 947 | *vblanktime = 0; |
| 948 | return 0; |
| 949 | } |
| 950 | |
| 951 | do { |
| 952 | seq = read_seqbegin(&vblank->seqlock); |
| 953 | vblank_count = atomic64_read(&vblank->count)({ typeof(*(&vblank->count)) __tmp = *(volatile typeof (*(&vblank->count)) *)&(*(&vblank->count)); membar_datadep_consumer(); __tmp; }); |
| 954 | *vblanktime = vblank->time; |
| 955 | } while (read_seqretry(&vblank->seqlock, seq)); |
| 956 | |
| 957 | return vblank_count; |
| 958 | } |
| 959 | |
| 960 | /** |
| 961 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value |
| 962 | * and the system timestamp corresponding to that vblank counter value |
| 963 | * @crtc: which counter to retrieve |
| 964 | * @vblanktime: Pointer to time to receive the vblank timestamp. |
| 965 | * |
| 966 | * Fetches the "cooked" vblank count value that represents the number of |
| 967 | * vblank events since the system was booted, including lost events due to |
| 968 | * modesetting activity. Returns corresponding system timestamp of the time |
| 969 | * of the vblank interval that corresponds to the current vblank counter value. |
| 970 | * |
| 971 | * Note that for a given vblank counter value drm_crtc_handle_vblank() |
| 972 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() |
| 973 | * provide a barrier: Any writes done before calling |
| 974 | * drm_crtc_handle_vblank() will be visible to callers of the later |
| 975 | * functions, if the vblank count is the same or a later one. |
| 976 | * |
| 977 | * See also &drm_vblank_crtc.count. |
| 978 | */ |
| 979 | u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, |
| 980 | ktime_t *vblanktime) |
| 981 | { |
| 982 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), |
| 983 | vblanktime); |
| 984 | } |
| 985 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); |
| 986 | |
| 987 | static void send_vblank_event(struct drm_device *dev, |
| 988 | struct drm_pending_vblank_event *e, |
| 989 | u64 seq, ktime_t now) |
| 990 | { |
| 991 | struct timespec64 tv; |
| 992 | |
| 993 | switch (e->event.base.type) { |
| 994 | case DRM_EVENT_VBLANK0x01: |
| 995 | case DRM_EVENT_FLIP_COMPLETE0x02: |
| 996 | tv = ktime_to_timespec64(now); |
| 997 | e->event.vbl.sequence = seq; |
| 998 | /* |
| 999 | * e->event is a user space structure, with hardcoded unsigned |
| 1000 | * 32-bit seconds/microseconds. This is safe as we always use |
| 1001 | * monotonic timestamps since linux-4.15 |
| 1002 | */ |
| 1003 | e->event.vbl.tv_sec = tv.tv_sec; |
| 1004 | e->event.vbl.tv_usec = tv.tv_nsec / 1000; |
| 1005 | break; |
| 1006 | case DRM_EVENT_CRTC_SEQUENCE0x03: |
| 1007 | if (seq) |
| 1008 | e->event.seq.sequence = seq; |
| 1009 | e->event.seq.time_ns = ktime_to_ns(now); |
| 1010 | break; |
| 1011 | } |
| 1012 | trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, seq); |
| 1013 | /* |
| 1014 | * Use the same timestamp for any associated fence signal to avoid |
| 1015 | * mismatch in timestamps for vsync & fence events triggered by the |
| 1016 | * same HW event. Frameworks like SurfaceFlinger in Android expects the |
| 1017 | * retire-fence timestamp to match exactly with HW vsync as it uses it |
| 1018 | * for its software vsync modeling. |
| 1019 | */ |
| 1020 | drm_send_event_timestamp_locked(dev, &e->base, now); |
| 1021 | } |
| 1022 | |
| 1023 | /** |
| 1024 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip |
| 1025 | * @crtc: the source CRTC of the vblank event |
| 1026 | * @e: the event to send |
| 1027 | * |
| 1028 | * A lot of drivers need to generate vblank events for the very next vblank |
| 1029 | * interrupt. For example when the page flip interrupt happens when the page |
| 1030 | * flip gets armed, but not when it actually executes within the next vblank |
| 1031 | * period. This helper function implements exactly the required vblank arming |
| 1032 | * behaviour. |
| 1033 | * |
| 1034 | * NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an |
| 1035 | * atomic commit must ensure that the next vblank happens at exactly the same |
| 1036 | * time as the atomic commit is committed to the hardware. This function itself |
| 1037 | * does **not** protect against the next vblank interrupt racing with either this |
| 1038 | * function call or the atomic commit operation. A possible sequence could be: |
| 1039 | * |
| 1040 | * 1. Driver commits new hardware state into vblank-synchronized registers. |
| 1041 | * 2. A vblank happens, committing the hardware state. Also the corresponding |
| 1042 | * vblank interrupt is fired off and fully processed by the interrupt |
| 1043 | * handler. |
| 1044 | * 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event(). |
| 1045 | * 4. The event is only send out for the next vblank, which is wrong. |
| 1046 | * |
| 1047 | * An equivalent race can happen when the driver calls |
| 1048 | * drm_crtc_arm_vblank_event() before writing out the new hardware state. |
| 1049 | * |
| 1050 | * The only way to make this work safely is to prevent the vblank from firing |
| 1051 | * (and the hardware from committing anything else) until the entire atomic |
| 1052 | * commit sequence has run to completion. If the hardware does not have such a |
| 1053 | * feature (e.g. using a "go" bit), then it is unsafe to use this functions. |
| 1054 | * Instead drivers need to manually send out the event from their interrupt |
| 1055 | * handler by calling drm_crtc_send_vblank_event() and make sure that there's no |
| 1056 | * possible race with the hardware committing the atomic update. |
| 1057 | * |
| 1058 | * Caller must hold a vblank reference for the event @e acquired by a |
| 1059 | * drm_crtc_vblank_get(), which will be dropped when the next vblank arrives. |
| 1060 | */ |
| 1061 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, |
| 1062 | struct drm_pending_vblank_event *e) |
| 1063 | { |
| 1064 | struct drm_device *dev = crtc->dev; |
| 1065 | unsigned int pipe = drm_crtc_index(crtc); |
| 1066 | |
| 1067 | assert_spin_locked(&dev->event_lock)do { if (((&dev->event_lock)->mtx_owner != ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci ) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci; })) && !(panicstr || db_active)) panic("mutex %p not held in %s" , (&dev->event_lock), __func__); } while (0); |
| 1068 | |
| 1069 | e->pipe = pipe; |
| 1070 | e->sequence = drm_crtc_accurate_vblank_count(crtc) + 1; |
| 1071 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
| 1072 | } |
| 1073 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); |
| 1074 | |
| 1075 | /** |
| 1076 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip |
| 1077 | * @crtc: the source CRTC of the vblank event |
| 1078 | * @e: the event to send |
| 1079 | * |
| 1080 | * Updates sequence # and timestamp on event for the most recently processed |
| 1081 | * vblank, and sends it to userspace. Caller must hold event lock. |
| 1082 | * |
| 1083 | * See drm_crtc_arm_vblank_event() for a helper which can be used in certain |
| 1084 | * situation, especially to send out events for atomic commit operations. |
| 1085 | */ |
| 1086 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, |
| 1087 | struct drm_pending_vblank_event *e) |
| 1088 | { |
| 1089 | struct drm_device *dev = crtc->dev; |
| 1090 | u64 seq; |
| 1091 | unsigned int pipe = drm_crtc_index(crtc); |
| 1092 | ktime_t now; |
| 1093 | |
| 1094 | if (drm_dev_has_vblank(dev)) { |
| 1095 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
| 1096 | } else { |
| 1097 | seq = 0; |
| 1098 | |
| 1099 | now = ktime_get(); |
| 1100 | } |
| 1101 | e->pipe = pipe; |
| 1102 | send_vblank_event(dev, e, seq, now); |
| 1103 | } |
| 1104 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); |
| 1105 | |
| 1106 | static int __enable_vblank(struct drm_device *dev, unsigned int pipe) |
| 1107 | { |
| 1108 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
| 1109 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
| 1110 | |
| 1111 | if (drm_WARN_ON(dev, !crtc)({ int __ret = !!((!crtc)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON(" "!crtc" ")"); __builtin_expect(!!(__ret), 0); })) |
| 1112 | return 0; |
| 1113 | |
| 1114 | if (crtc->funcs->enable_vblank) |
| 1115 | return crtc->funcs->enable_vblank(crtc); |
| 1116 | } |
| 1117 | #ifdef CONFIG_DRM_LEGACY |
| 1118 | else if (dev->driver->enable_vblank) { |
| 1119 | return dev->driver->enable_vblank(dev, pipe); |
| 1120 | } |
| 1121 | #endif |
| 1122 | |
| 1123 | return -EINVAL22; |
| 1124 | } |
| 1125 | |
| 1126 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
| 1127 | { |
| 1128 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 1129 | int ret = 0; |
| 1130 | |
| 1131 | assert_spin_locked(&dev->vbl_lock)do { if (((&dev->vbl_lock)->mtx_owner != ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof (struct cpu_info, ci_self))); __ci;})) && !(panicstr || db_active)) panic("mutex %p not held in %s", (&dev->vbl_lock ), __func__); } while (0); |
| 1132 | |
| 1133 | spin_lock(&dev->vblank_time_lock)mtx_enter(&dev->vblank_time_lock); |
| 1134 | |
| 1135 | if (!vblank->enabled) { |
| 1136 | /* |
| 1137 | * Enable vblank irqs under vblank_time_lock protection. |
| 1138 | * All vblank count & timestamp updates are held off |
| 1139 | * until we are done reinitializing master counter and |
| 1140 | * timestamps. Filtercode in drm_handle_vblank() will |
| 1141 | * prevent double-accounting of same vblank interval. |
| 1142 | */ |
| 1143 | ret = __enable_vblank(dev, pipe); |
| 1144 | drm_dbg_core(dev, "enabling vblank on crtc %u, ret: %d\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "enabling vblank on crtc %u, ret: %d\n", pipe , ret) |
| 1145 | pipe, ret)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "enabling vblank on crtc %u, ret: %d\n", pipe , ret); |
| 1146 | if (ret) { |
| 1147 | atomic_dec(&vblank->refcount)__sync_fetch_and_sub(&vblank->refcount, 1); |
| 1148 | } else { |
| 1149 | drm_update_vblank_count(dev, pipe, 0); |
| 1150 | /* drm_update_vblank_count() includes a wmb so we just |
| 1151 | * need to ensure that the compiler emits the write |
| 1152 | * to mark the vblank as enabled after the call |
| 1153 | * to drm_update_vblank_count(). |
| 1154 | */ |
| 1155 | WRITE_ONCE(vblank->enabled, true)({ typeof(vblank->enabled) __tmp = (1); *(volatile typeof( vblank->enabled) *)&(vblank->enabled) = __tmp; __tmp ; }); |
| 1156 | } |
| 1157 | } |
| 1158 | |
| 1159 | spin_unlock(&dev->vblank_time_lock)mtx_leave(&dev->vblank_time_lock); |
| 1160 | |
| 1161 | return ret; |
| 1162 | } |
| 1163 | |
| 1164 | int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
| 1165 | { |
| 1166 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 1167 | unsigned long irqflags; |
| 1168 | int ret = 0; |
| 1169 | |
| 1170 | if (!drm_dev_has_vblank(dev)) |
| 1171 | return -EINVAL22; |
| 1172 | |
| 1173 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
| 1174 | return -EINVAL22; |
| 1175 | |
| 1176 | spin_lock_irqsave(&dev->vbl_lock, irqflags)do { irqflags = 0; mtx_enter(&dev->vbl_lock); } while ( 0); |
| 1177 | /* Going from 0->1 means we have to enable interrupts again */ |
| 1178 | if (atomic_add_return(1, &vblank->refcount)__sync_add_and_fetch(&vblank->refcount, 1) == 1) { |
| 1179 | ret = drm_vblank_enable(dev, pipe); |
| 1180 | } else { |
| 1181 | if (!vblank->enabled) { |
| 1182 | atomic_dec(&vblank->refcount)__sync_fetch_and_sub(&vblank->refcount, 1); |
| 1183 | ret = -EINVAL22; |
| 1184 | } |
| 1185 | } |
| 1186 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags)do { (void)(irqflags); mtx_leave(&dev->vbl_lock); } while (0); |
| 1187 | |
| 1188 | return ret; |
| 1189 | } |
| 1190 | |
| 1191 | /** |
| 1192 | * drm_crtc_vblank_get - get a reference count on vblank events |
| 1193 | * @crtc: which CRTC to own |
| 1194 | * |
| 1195 | * Acquire a reference count on vblank events to avoid having them disabled |
| 1196 | * while in use. |
| 1197 | * |
| 1198 | * Returns: |
| 1199 | * Zero on success or a negative error code on failure. |
| 1200 | */ |
| 1201 | int drm_crtc_vblank_get(struct drm_crtc *crtc) |
| 1202 | { |
| 1203 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); |
| 1204 | } |
| 1205 | EXPORT_SYMBOL(drm_crtc_vblank_get); |
| 1206 | |
| 1207 | void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
| 1208 | { |
| 1209 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 1210 | |
| 1211 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
| 1212 | return; |
| 1213 | |
| 1214 | if (drm_WARN_ON(dev, atomic_read(&vblank->refcount) == 0)({ int __ret = !!((({ typeof(*(&vblank->refcount)) __tmp = *(volatile typeof(*(&vblank->refcount)) *)&(*(& vblank->refcount)); membar_datadep_consumer(); __tmp; }) == 0)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev ))->dev), "", "drm_WARN_ON(" "({ typeof(*(&vblank->refcount)) __tmp = *(volatile typeof(*(&vblank->refcount)) *)&(*(&vblank->refcount)); membar_datadep_consumer(); __tmp; }) == 0" ")"); __builtin_expect(!!(__ret), 0); })) |
| 1215 | return; |
| 1216 | |
| 1217 | /* Last user schedules interrupt disable */ |
| 1218 | if (atomic_dec_and_test(&vblank->refcount)(__sync_sub_and_fetch((&vblank->refcount), 1) == 0)) { |
| 1219 | if (drm_vblank_offdelay == 0) |
| 1220 | return; |
| 1221 | else if (drm_vblank_offdelay < 0) |
| 1222 | vblank_disable_fn(vblank); |
| 1223 | else if (!dev->vblank_disable_immediate) |
| 1224 | mod_timer(&vblank->disable_timer, |
| 1225 | jiffies + ((drm_vblank_offdelay * HZhz)/1000)); |
| 1226 | } |
| 1227 | } |
| 1228 | |
| 1229 | /** |
| 1230 | * drm_crtc_vblank_put - give up ownership of vblank events |
| 1231 | * @crtc: which counter to give up |
| 1232 | * |
| 1233 | * Release ownership of a given vblank counter, turning off interrupts |
| 1234 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
| 1235 | */ |
| 1236 | void drm_crtc_vblank_put(struct drm_crtc *crtc) |
| 1237 | { |
| 1238 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); |
| 1239 | } |
| 1240 | EXPORT_SYMBOL(drm_crtc_vblank_put); |
| 1241 | |
| 1242 | /** |
| 1243 | * drm_wait_one_vblank - wait for one vblank |
| 1244 | * @dev: DRM device |
| 1245 | * @pipe: CRTC index |
| 1246 | * |
| 1247 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. |
| 1248 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. |
| 1249 | * due to lack of driver support or because the crtc is off. |
| 1250 | * |
| 1251 | * This is the legacy version of drm_crtc_wait_one_vblank(). |
| 1252 | */ |
| 1253 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) |
| 1254 | { |
| 1255 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 1256 | int ret; |
| 1257 | u64 last; |
| 1258 | |
| 1259 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
| 1260 | return; |
| 1261 | |
| 1262 | #ifdef __OpenBSD__1 |
| 1263 | /* |
| 1264 | * If we're cold, vblank interrupts won't happen even if |
| 1265 | * they're turned on by the driver. Just stall long enough |
| 1266 | * for a vblank to pass. This assumes a vrefresh of at least |
| 1267 | * 25 Hz. |
| 1268 | */ |
| 1269 | if (cold) { |
| 1270 | delay(40000)(*delay_func)(40000); |
| 1271 | return; |
| 1272 | } |
| 1273 | #endif |
| 1274 | |
| 1275 | ret = drm_vblank_get(dev, pipe); |
| 1276 | if (drm_WARN(dev, ret, "vblank not available on crtc %i, ret=%i\n",({ int __ret = !!(ret); if (__ret) printf("%s %s: " "vblank not available on crtc %i, ret=%i\n" , dev_driver_string((dev)->dev), "", pipe, ret); __builtin_expect (!!(__ret), 0); }) |
| 1277 | pipe, ret)({ int __ret = !!(ret); if (__ret) printf("%s %s: " "vblank not available on crtc %i, ret=%i\n" , dev_driver_string((dev)->dev), "", pipe, ret); __builtin_expect (!!(__ret), 0); })) |
| 1278 | return; |
| 1279 | |
| 1280 | last = drm_vblank_count(dev, pipe); |
| 1281 | |
| 1282 | ret = wait_event_timeout(vblank->queue,({ long __ret = (((uint64_t)(100)) * hz / 1000); if (!(last != drm_vblank_count(dev, pipe))) __ret = ({ long __ret = (((uint64_t )(100)) * hz / 1000); struct wait_queue_entry __wq_entry; init_wait_entry (&__wq_entry, 0); do { int __error, __wait; unsigned long deadline; ((!cold) ? (void)0 : __assert("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_vblank.c" , 1284, "!cold")); prepare_to_wait(&vblank->queue, & __wq_entry, 0); deadline = jiffies + __ret; __wait = !(last != drm_vblank_count(dev, pipe)); __error = sleep_finish(__ret, __wait ); if (((((uint64_t)(100)) * hz / 1000)) > 0) __ret = deadline - jiffies; if (__error == -1 || __error == 4) { __ret = -4; break ; } if (((((uint64_t)(100)) * hz / 1000)) > 0 && ( __ret <= 0 || __error == 35)) { __ret = ((last != drm_vblank_count (dev, pipe))) ? 1 : 0; break; } } while (__ret > 0 && !(last != drm_vblank_count(dev, pipe))); finish_wait(&vblank ->queue, &__wq_entry); __ret; }); __ret; }) |
| 1283 | last != drm_vblank_count(dev, pipe),({ long __ret = (((uint64_t)(100)) * hz / 1000); if (!(last != drm_vblank_count(dev, pipe))) __ret = ({ long __ret = (((uint64_t )(100)) * hz / 1000); struct wait_queue_entry __wq_entry; init_wait_entry (&__wq_entry, 0); do { int __error, __wait; unsigned long deadline; ((!cold) ? (void)0 : __assert("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_vblank.c" , 1284, "!cold")); prepare_to_wait(&vblank->queue, & __wq_entry, 0); deadline = jiffies + __ret; __wait = !(last != drm_vblank_count(dev, pipe)); __error = sleep_finish(__ret, __wait ); if (((((uint64_t)(100)) * hz / 1000)) > 0) __ret = deadline - jiffies; if (__error == -1 || __error == 4) { __ret = -4; break ; } if (((((uint64_t)(100)) * hz / 1000)) > 0 && ( __ret <= 0 || __error == 35)) { __ret = ((last != drm_vblank_count (dev, pipe))) ? 1 : 0; break; } } while (__ret > 0 && !(last != drm_vblank_count(dev, pipe))); finish_wait(&vblank ->queue, &__wq_entry); __ret; }); __ret; }) |
| 1284 | msecs_to_jiffies(100))({ long __ret = (((uint64_t)(100)) * hz / 1000); if (!(last != drm_vblank_count(dev, pipe))) __ret = ({ long __ret = (((uint64_t )(100)) * hz / 1000); struct wait_queue_entry __wq_entry; init_wait_entry (&__wq_entry, 0); do { int __error, __wait; unsigned long deadline; ((!cold) ? (void)0 : __assert("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_vblank.c" , 1284, "!cold")); prepare_to_wait(&vblank->queue, & __wq_entry, 0); deadline = jiffies + __ret; __wait = !(last != drm_vblank_count(dev, pipe)); __error = sleep_finish(__ret, __wait ); if (((((uint64_t)(100)) * hz / 1000)) > 0) __ret = deadline - jiffies; if (__error == -1 || __error == 4) { __ret = -4; break ; } if (((((uint64_t)(100)) * hz / 1000)) > 0 && ( __ret <= 0 || __error == 35)) { __ret = ((last != drm_vblank_count (dev, pipe))) ? 1 : 0; break; } } while (__ret > 0 && !(last != drm_vblank_count(dev, pipe))); finish_wait(&vblank ->queue, &__wq_entry); __ret; }); __ret; }); |
| 1285 | |
| 1286 | drm_WARN(dev, ret == 0, "vblank wait timed out on crtc %i\n", pipe)({ int __ret = !!(ret == 0); if (__ret) printf("%s %s: " "vblank wait timed out on crtc %i\n" , dev_driver_string((dev)->dev), "", pipe); __builtin_expect (!!(__ret), 0); }); |
| 1287 | |
| 1288 | drm_vblank_put(dev, pipe); |
| 1289 | } |
| 1290 | EXPORT_SYMBOL(drm_wait_one_vblank); |
| 1291 | |
| 1292 | /** |
| 1293 | * drm_crtc_wait_one_vblank - wait for one vblank |
| 1294 | * @crtc: DRM crtc |
| 1295 | * |
| 1296 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. |
| 1297 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. |
| 1298 | * due to lack of driver support or because the crtc is off. |
| 1299 | */ |
| 1300 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) |
| 1301 | { |
| 1302 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); |
| 1303 | } |
| 1304 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); |
| 1305 | |
| 1306 | /** |
| 1307 | * drm_crtc_vblank_off - disable vblank events on a CRTC |
| 1308 | * @crtc: CRTC in question |
| 1309 | * |
| 1310 | * Drivers can use this function to shut down the vblank interrupt handling when |
| 1311 | * disabling a crtc. This function ensures that the latest vblank frame count is |
| 1312 | * stored so that drm_vblank_on can restore it again. |
| 1313 | * |
| 1314 | * Drivers must use this function when the hardware vblank counter can get |
| 1315 | * reset, e.g. when suspending or disabling the @crtc in general. |
| 1316 | */ |
| 1317 | void drm_crtc_vblank_off(struct drm_crtc *crtc) |
| 1318 | { |
| 1319 | struct drm_device *dev = crtc->dev; |
| 1320 | unsigned int pipe = drm_crtc_index(crtc); |
| 1321 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 1322 | struct drm_pending_vblank_event *e, *t; |
| 1323 | ktime_t now; |
| 1324 | u64 seq; |
| 1325 | |
| 1326 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
| 1327 | return; |
| 1328 | |
| 1329 | /* |
| 1330 | * Grab event_lock early to prevent vblank work from being scheduled |
| 1331 | * while we're in the middle of shutting down vblank interrupts |
| 1332 | */ |
| 1333 | spin_lock_irq(&dev->event_lock)mtx_enter(&dev->event_lock); |
| 1334 | |
| 1335 | spin_lock(&dev->vbl_lock)mtx_enter(&dev->vbl_lock); |
| 1336 | drm_dbg_vbl(dev, "crtc %d, vblank enabled %d, inmodeset %d\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %d, vblank enabled %d, inmodeset %d\n", pipe , vblank->enabled, vblank->inmodeset) |
| 1337 | pipe, vblank->enabled, vblank->inmodeset)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %d, vblank enabled %d, inmodeset %d\n", pipe , vblank->enabled, vblank->inmodeset); |
| 1338 | |
| 1339 | /* Avoid redundant vblank disables without previous |
| 1340 | * drm_crtc_vblank_on(). */ |
| 1341 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) |
| 1342 | drm_vblank_disable_and_save(dev, pipe); |
| 1343 | |
| 1344 | wake_up(&vblank->queue); |
| 1345 | |
| 1346 | /* |
| 1347 | * Prevent subsequent drm_vblank_get() from re-enabling |
| 1348 | * the vblank interrupt by bumping the refcount. |
| 1349 | */ |
| 1350 | if (!vblank->inmodeset) { |
| 1351 | atomic_inc(&vblank->refcount)__sync_fetch_and_add(&vblank->refcount, 1); |
| 1352 | vblank->inmodeset = 1; |
| 1353 | } |
| 1354 | spin_unlock(&dev->vbl_lock)mtx_leave(&dev->vbl_lock); |
| 1355 | |
| 1356 | /* Send any queued vblank events, lest the natives grow disquiet */ |
| 1357 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
| 1358 | |
| 1359 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link)for (e = ({ const __typeof( ((__typeof(*e) *)0)->base.link ) *__mptr = ((&dev->vblank_event_list)->next); (__typeof (*e) *)( (char *)__mptr - __builtin_offsetof(__typeof(*e), base .link) );}), t = ({ const __typeof( ((__typeof(*e) *)0)->base .link ) *__mptr = (e->base.link.next); (__typeof(*e) *)( ( char *)__mptr - __builtin_offsetof(__typeof(*e), base.link) ) ;}); &e->base.link != (&dev->vblank_event_list) ; e = t, t = ({ const __typeof( ((__typeof(*t) *)0)->base. link ) *__mptr = (t->base.link.next); (__typeof(*t) *)( (char *)__mptr - __builtin_offsetof(__typeof(*t), base.link) );})) { |
| 1360 | if (e->pipe != pipe) |
| 1361 | continue; |
| 1362 | drm_dbg_core(dev, "Sending premature vblank event on disable: "__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "Sending premature vblank event on disable: " "wanted %llu, current %llu\n", e->sequence, seq) |
| 1363 | "wanted %llu, current %llu\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "Sending premature vblank event on disable: " "wanted %llu, current %llu\n", e->sequence, seq) |
| 1364 | e->sequence, seq)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "Sending premature vblank event on disable: " "wanted %llu, current %llu\n", e->sequence, seq); |
| 1365 | list_del(&e->base.link); |
| 1366 | drm_vblank_put(dev, pipe); |
| 1367 | send_vblank_event(dev, e, seq, now); |
| 1368 | } |
| 1369 | |
| 1370 | /* Cancel any leftover pending vblank work */ |
| 1371 | drm_vblank_cancel_pending_works(vblank); |
| 1372 | |
| 1373 | spin_unlock_irq(&dev->event_lock)mtx_leave(&dev->event_lock); |
| 1374 | |
| 1375 | /* Will be reset by the modeset helpers when re-enabling the crtc by |
| 1376 | * calling drm_calc_timestamping_constants(). */ |
| 1377 | vblank->hwmode.crtc_clock = 0; |
| 1378 | |
| 1379 | /* Wait for any vblank work that's still executing to finish */ |
| 1380 | drm_vblank_flush_worker(vblank); |
| 1381 | } |
| 1382 | EXPORT_SYMBOL(drm_crtc_vblank_off); |
| 1383 | |
| 1384 | /** |
| 1385 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC |
| 1386 | * @crtc: CRTC in question |
| 1387 | * |
| 1388 | * Drivers can use this function to reset the vblank state to off at load time. |
| 1389 | * Drivers should use this together with the drm_crtc_vblank_off() and |
| 1390 | * drm_crtc_vblank_on() functions. The difference compared to |
| 1391 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter |
| 1392 | * and hence doesn't need to call any driver hooks. |
| 1393 | * |
| 1394 | * This is useful for recovering driver state e.g. on driver load, or on resume. |
| 1395 | */ |
| 1396 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) |
| 1397 | { |
| 1398 | struct drm_device *dev = crtc->dev; |
| 1399 | unsigned int pipe = drm_crtc_index(crtc); |
| 1400 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 1401 | |
| 1402 | spin_lock_irq(&dev->vbl_lock)mtx_enter(&dev->vbl_lock); |
| 1403 | /* |
| 1404 | * Prevent subsequent drm_vblank_get() from enabling the vblank |
| 1405 | * interrupt by bumping the refcount. |
| 1406 | */ |
| 1407 | if (!vblank->inmodeset) { |
| 1408 | atomic_inc(&vblank->refcount)__sync_fetch_and_add(&vblank->refcount, 1); |
| 1409 | vblank->inmodeset = 1; |
| 1410 | } |
| 1411 | spin_unlock_irq(&dev->vbl_lock)mtx_leave(&dev->vbl_lock); |
| 1412 | |
| 1413 | drm_WARN_ON(dev, !list_empty(&dev->vblank_event_list))({ int __ret = !!((!list_empty(&dev->vblank_event_list ))); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev ))->dev), "", "drm_WARN_ON(" "!list_empty(&dev->vblank_event_list)" ")"); __builtin_expect(!!(__ret), 0); }); |
| 1414 | drm_WARN_ON(dev, !list_empty(&vblank->pending_work))({ int __ret = !!((!list_empty(&vblank->pending_work)) ); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev) )->dev), "", "drm_WARN_ON(" "!list_empty(&vblank->pending_work)" ")"); __builtin_expect(!!(__ret), 0); }); |
| 1415 | } |
| 1416 | EXPORT_SYMBOL(drm_crtc_vblank_reset); |
| 1417 | |
| 1418 | /** |
| 1419 | * drm_crtc_set_max_vblank_count - configure the hw max vblank counter value |
| 1420 | * @crtc: CRTC in question |
| 1421 | * @max_vblank_count: max hardware vblank counter value |
| 1422 | * |
| 1423 | * Update the maximum hardware vblank counter value for @crtc |
| 1424 | * at runtime. Useful for hardware where the operation of the |
| 1425 | * hardware vblank counter depends on the currently active |
| 1426 | * display configuration. |
| 1427 | * |
| 1428 | * For example, if the hardware vblank counter does not work |
| 1429 | * when a specific connector is active the maximum can be set |
| 1430 | * to zero. And when that specific connector isn't active the |
| 1431 | * maximum can again be set to the appropriate non-zero value. |
| 1432 | * |
| 1433 | * If used, must be called before drm_vblank_on(). |
| 1434 | */ |
| 1435 | void drm_crtc_set_max_vblank_count(struct drm_crtc *crtc, |
| 1436 | u32 max_vblank_count) |
| 1437 | { |
| 1438 | struct drm_device *dev = crtc->dev; |
| 1439 | unsigned int pipe = drm_crtc_index(crtc); |
| 1440 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 1441 | |
| 1442 | drm_WARN_ON(dev, dev->max_vblank_count)({ int __ret = !!((dev->max_vblank_count)); if (__ret) printf ("%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON(" "dev->max_vblank_count" ")"); __builtin_expect(!!(__ret), 0); }); |
| 1443 | drm_WARN_ON(dev, !READ_ONCE(vblank->inmodeset))({ int __ret = !!((!({ typeof(vblank->inmodeset) __tmp = * (volatile typeof(vblank->inmodeset) *)&(vblank->inmodeset ); membar_datadep_consumer(); __tmp; }))); if (__ret) printf( "%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON(" "!({ typeof(vblank->inmodeset) __tmp = *(volatile typeof(vblank->inmodeset) *)&(vblank->inmodeset); membar_datadep_consumer(); __tmp; })" ")"); __builtin_expect(!!(__ret), 0); }); |
| 1444 | |
| 1445 | vblank->max_vblank_count = max_vblank_count; |
| 1446 | } |
| 1447 | EXPORT_SYMBOL(drm_crtc_set_max_vblank_count); |
| 1448 | |
| 1449 | /** |
| 1450 | * drm_crtc_vblank_on - enable vblank events on a CRTC |
| 1451 | * @crtc: CRTC in question |
| 1452 | * |
| 1453 | * This functions restores the vblank interrupt state captured with |
| 1454 | * drm_crtc_vblank_off() again and is generally called when enabling @crtc. Note |
| 1455 | * that calls to drm_crtc_vblank_on() and drm_crtc_vblank_off() can be |
| 1456 | * unbalanced and so can also be unconditionally called in driver load code to |
| 1457 | * reflect the current hardware state of the crtc. |
| 1458 | */ |
| 1459 | void drm_crtc_vblank_on(struct drm_crtc *crtc) |
| 1460 | { |
| 1461 | struct drm_device *dev = crtc->dev; |
| 1462 | unsigned int pipe = drm_crtc_index(crtc); |
| 1463 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 1464 | |
| 1465 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
| 1466 | return; |
| 1467 | |
| 1468 | spin_lock_irq(&dev->vbl_lock)mtx_enter(&dev->vbl_lock); |
| 1469 | drm_dbg_vbl(dev, "crtc %d, vblank enabled %d, inmodeset %d\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %d, vblank enabled %d, inmodeset %d\n", pipe , vblank->enabled, vblank->inmodeset) |
| 1470 | pipe, vblank->enabled, vblank->inmodeset)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "crtc %d, vblank enabled %d, inmodeset %d\n", pipe , vblank->enabled, vblank->inmodeset); |
| 1471 | |
| 1472 | /* Drop our private "prevent drm_vblank_get" refcount */ |
| 1473 | if (vblank->inmodeset) { |
| 1474 | atomic_dec(&vblank->refcount)__sync_fetch_and_sub(&vblank->refcount, 1); |
| 1475 | vblank->inmodeset = 0; |
| 1476 | } |
| 1477 | |
| 1478 | drm_reset_vblank_timestamp(dev, pipe); |
| 1479 | |
| 1480 | /* |
| 1481 | * re-enable interrupts if there are users left, or the |
| 1482 | * user wishes vblank interrupts to be enabled all the time. |
| 1483 | */ |
| 1484 | if (atomic_read(&vblank->refcount)({ typeof(*(&vblank->refcount)) __tmp = *(volatile typeof (*(&vblank->refcount)) *)&(*(&vblank->refcount )); membar_datadep_consumer(); __tmp; }) != 0 || drm_vblank_offdelay == 0) |
| 1485 | drm_WARN_ON(dev, drm_vblank_enable(dev, pipe))({ int __ret = !!((drm_vblank_enable(dev, pipe))); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "drm_vblank_enable(dev, pipe)" ")"); __builtin_expect (!!(__ret), 0); }); |
| 1486 | spin_unlock_irq(&dev->vbl_lock)mtx_leave(&dev->vbl_lock); |
| 1487 | } |
| 1488 | EXPORT_SYMBOL(drm_crtc_vblank_on); |
| 1489 | |
| 1490 | static void drm_vblank_restore(struct drm_device *dev, unsigned int pipe) |
| 1491 | { |
| 1492 | ktime_t t_vblank; |
| 1493 | struct drm_vblank_crtc *vblank; |
| 1494 | int framedur_ns; |
| 1495 | u64 diff_ns; |
| 1496 | u32 cur_vblank, diff = 1; |
| 1497 | int count = DRM_TIMESTAMP_MAXRETRIES3; |
| 1498 | u32 max_vblank_count = drm_max_vblank_count(dev, pipe); |
| 1499 | |
| 1500 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
| 1501 | return; |
| 1502 | |
| 1503 | assert_spin_locked(&dev->vbl_lock)do { if (((&dev->vbl_lock)->mtx_owner != ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof (struct cpu_info, ci_self))); __ci;})) && !(panicstr || db_active)) panic("mutex %p not held in %s", (&dev->vbl_lock ), __func__); } while (0); |
| 1504 | assert_spin_locked(&dev->vblank_time_lock)do { if (((&dev->vblank_time_lock)->mtx_owner != ({ struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})) && !(panicstr || db_active)) panic("mutex %p not held in %s" , (&dev->vblank_time_lock), __func__); } while (0); |
| 1505 | |
| 1506 | vblank = &dev->vblank[pipe]; |
| 1507 | drm_WARN_ONCE(dev,({ static int __warned; int __ret = !!(drm_debug_enabled_raw( DRM_UT_VBL) && !vblank->framedur_ns); if (__ret && !__warned) { printf("%s %s: " "Cannot compute missed vblanks without frame duration\n" , dev_driver_string((dev)->dev), ""); __warned = 1; } __builtin_expect (!!(__ret), 0); }) |
| 1508 | drm_debug_enabled(DRM_UT_VBL) && !vblank->framedur_ns,({ static int __warned; int __ret = !!(drm_debug_enabled_raw( DRM_UT_VBL) && !vblank->framedur_ns); if (__ret && !__warned) { printf("%s %s: " "Cannot compute missed vblanks without frame duration\n" , dev_driver_string((dev)->dev), ""); __warned = 1; } __builtin_expect (!!(__ret), 0); }) |
| 1509 | "Cannot compute missed vblanks without frame duration\n")({ static int __warned; int __ret = !!(drm_debug_enabled_raw( DRM_UT_VBL) && !vblank->framedur_ns); if (__ret && !__warned) { printf("%s %s: " "Cannot compute missed vblanks without frame duration\n" , dev_driver_string((dev)->dev), ""); __warned = 1; } __builtin_expect (!!(__ret), 0); }); |
| 1510 | framedur_ns = vblank->framedur_ns; |
| 1511 | |
| 1512 | do { |
| 1513 | cur_vblank = __get_vblank_counter(dev, pipe); |
| 1514 | drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false0); |
| 1515 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); |
| 1516 | |
| 1517 | diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); |
| 1518 | if (framedur_ns) |
| 1519 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns)(((diff_ns) + ((framedur_ns) / 2)) / (framedur_ns)); |
| 1520 | |
| 1521 | |
| 1522 | drm_dbg_vbl(dev,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n" , diff, diff_ns, framedur_ns, cur_vblank - vblank->last) |
| 1523 | "missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n" , diff, diff_ns, framedur_ns, cur_vblank - vblank->last) |
| 1524 | diff, diff_ns, framedur_ns, cur_vblank - vblank->last)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_VBL, "missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n" , diff, diff_ns, framedur_ns, cur_vblank - vblank->last); |
| 1525 | vblank->last = (cur_vblank - diff) & max_vblank_count; |
| 1526 | } |
| 1527 | |
| 1528 | /** |
| 1529 | * drm_crtc_vblank_restore - estimate missed vblanks and update vblank count. |
| 1530 | * @crtc: CRTC in question |
| 1531 | * |
| 1532 | * Power manamement features can cause frame counter resets between vblank |
| 1533 | * disable and enable. Drivers can use this function in their |
| 1534 | * &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since |
| 1535 | * the last &drm_crtc_funcs.disable_vblank using timestamps and update the |
| 1536 | * vblank counter. |
| 1537 | * |
| 1538 | * Note that drivers must have race-free high-precision timestamping support, |
| 1539 | * i.e. &drm_crtc_funcs.get_vblank_timestamp must be hooked up and |
| 1540 | * &drm_driver.vblank_disable_immediate must be set to indicate the |
| 1541 | * time-stamping functions are race-free against vblank hardware counter |
| 1542 | * increments. |
| 1543 | */ |
| 1544 | void drm_crtc_vblank_restore(struct drm_crtc *crtc) |
| 1545 | { |
| 1546 | WARN_ON_ONCE(!crtc->funcs->get_vblank_timestamp)({ static int __warned; int __ret = !!(!crtc->funcs->get_vblank_timestamp ); if (__ret && !__warned) { printf("WARNING %s failed at %s:%d\n" , "!crtc->funcs->get_vblank_timestamp", "/usr/src/sys/dev/pci/drm/drm_vblank.c" , 1546); __warned = 1; } __builtin_expect(!!(__ret), 0); }); |
| 1547 | WARN_ON_ONCE(!crtc->dev->vblank_disable_immediate)({ static int __warned; int __ret = !!(!crtc->dev->vblank_disable_immediate ); if (__ret && !__warned) { printf("WARNING %s failed at %s:%d\n" , "!crtc->dev->vblank_disable_immediate", "/usr/src/sys/dev/pci/drm/drm_vblank.c" , 1547); __warned = 1; } __builtin_expect(!!(__ret), 0); }); |
| 1548 | |
| 1549 | drm_vblank_restore(crtc->dev, drm_crtc_index(crtc)); |
| 1550 | } |
| 1551 | EXPORT_SYMBOL(drm_crtc_vblank_restore); |
| 1552 | |
| 1553 | static void drm_legacy_vblank_pre_modeset(struct drm_device *dev, |
| 1554 | unsigned int pipe) |
| 1555 | { |
| 1556 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 1557 | |
| 1558 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
| 1559 | if (!drm_dev_has_vblank(dev)) |
| 1560 | return; |
| 1561 | |
| 1562 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
| 1563 | return; |
| 1564 | |
| 1565 | /* |
| 1566 | * To avoid all the problems that might happen if interrupts |
| 1567 | * were enabled/disabled around or between these calls, we just |
| 1568 | * have the kernel take a reference on the CRTC (just once though |
| 1569 | * to avoid corrupting the count if multiple, mismatch calls occur), |
| 1570 | * so that interrupts remain enabled in the interim. |
| 1571 | */ |
| 1572 | if (!vblank->inmodeset) { |
| 1573 | vblank->inmodeset = 0x1; |
| 1574 | if (drm_vblank_get(dev, pipe) == 0) |
| 1575 | vblank->inmodeset |= 0x2; |
| 1576 | } |
| 1577 | } |
| 1578 | |
| 1579 | static void drm_legacy_vblank_post_modeset(struct drm_device *dev, |
| 1580 | unsigned int pipe) |
| 1581 | { |
| 1582 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 1583 | |
| 1584 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
| 1585 | if (!drm_dev_has_vblank(dev)) |
| 1586 | return; |
| 1587 | |
| 1588 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
| 1589 | return; |
| 1590 | |
| 1591 | if (vblank->inmodeset) { |
| 1592 | spin_lock_irq(&dev->vbl_lock)mtx_enter(&dev->vbl_lock); |
| 1593 | drm_reset_vblank_timestamp(dev, pipe); |
| 1594 | spin_unlock_irq(&dev->vbl_lock)mtx_leave(&dev->vbl_lock); |
| 1595 | |
| 1596 | if (vblank->inmodeset & 0x2) |
| 1597 | drm_vblank_put(dev, pipe); |
| 1598 | |
| 1599 | vblank->inmodeset = 0; |
| 1600 | } |
| 1601 | } |
| 1602 | |
| 1603 | int drm_legacy_modeset_ctl_ioctl(struct drm_device *dev, void *data, |
| 1604 | struct drm_file *file_priv) |
| 1605 | { |
| 1606 | struct drm_modeset_ctl *modeset = data; |
| 1607 | unsigned int pipe; |
| 1608 | |
| 1609 | /* If drm_vblank_init() hasn't been called yet, just no-op */ |
| 1610 | if (!drm_dev_has_vblank(dev)) |
| 1611 | return 0; |
| 1612 | |
| 1613 | /* KMS drivers handle this internally */ |
| 1614 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
| 1615 | return 0; |
| 1616 | |
| 1617 | pipe = modeset->crtc; |
| 1618 | if (pipe >= dev->num_crtcs) |
| 1619 | return -EINVAL22; |
| 1620 | |
| 1621 | switch (modeset->cmd) { |
| 1622 | case _DRM_PRE_MODESET1: |
| 1623 | drm_legacy_vblank_pre_modeset(dev, pipe); |
| 1624 | break; |
| 1625 | case _DRM_POST_MODESET2: |
| 1626 | drm_legacy_vblank_post_modeset(dev, pipe); |
| 1627 | break; |
| 1628 | default: |
| 1629 | return -EINVAL22; |
| 1630 | } |
| 1631 | |
| 1632 | return 0; |
| 1633 | } |
| 1634 | |
| 1635 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, |
| 1636 | u64 req_seq, |
| 1637 | union drm_wait_vblank *vblwait, |
| 1638 | struct drm_file *file_priv) |
| 1639 | { |
| 1640 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 1641 | struct drm_pending_vblank_event *e; |
| 1642 | ktime_t now; |
| 1643 | u64 seq; |
| 1644 | int ret; |
| 1645 | |
| 1646 | e = kzalloc(sizeof(*e), GFP_KERNEL(0x0001 | 0x0004)); |
| 1647 | if (e == NULL((void *)0)) { |
| 1648 | ret = -ENOMEM12; |
| 1649 | goto err_put; |
| 1650 | } |
| 1651 | |
| 1652 | e->pipe = pipe; |
| 1653 | e->event.base.type = DRM_EVENT_VBLANK0x01; |
| 1654 | e->event.base.length = sizeof(e->event.vbl); |
| 1655 | e->event.vbl.user_data = vblwait->request.signal; |
| 1656 | e->event.vbl.crtc_id = 0; |
| 1657 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
| 1658 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
| 1659 | |
| 1660 | if (crtc) |
| 1661 | e->event.vbl.crtc_id = crtc->base.id; |
| 1662 | } |
| 1663 | |
| 1664 | spin_lock_irq(&dev->event_lock)mtx_enter(&dev->event_lock); |
| 1665 | |
| 1666 | /* |
| 1667 | * drm_crtc_vblank_off() might have been called after we called |
| 1668 | * drm_vblank_get(). drm_crtc_vblank_off() holds event_lock around the |
| 1669 | * vblank disable, so no need for further locking. The reference from |
| 1670 | * drm_vblank_get() protects against vblank disable from another source. |
| 1671 | */ |
| 1672 | if (!READ_ONCE(vblank->enabled)({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank ->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; })) { |
| 1673 | ret = -EINVAL22; |
| 1674 | goto err_unlock; |
| 1675 | } |
| 1676 | |
| 1677 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, |
| 1678 | &e->event.base); |
| 1679 | |
| 1680 | if (ret) |
| 1681 | goto err_unlock; |
| 1682 | |
| 1683 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
| 1684 | |
| 1685 | drm_dbg_core(dev, "event on vblank count %llu, current %llu, crtc %u\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "event on vblank count %llu, current %llu, crtc %u\n" , req_seq, seq, pipe) |
| 1686 | req_seq, seq, pipe)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "event on vblank count %llu, current %llu, crtc %u\n" , req_seq, seq, pipe); |
| 1687 | |
| 1688 | trace_drm_vblank_event_queued(file_priv, pipe, req_seq); |
| 1689 | |
| 1690 | e->sequence = req_seq; |
| 1691 | if (drm_vblank_passed(seq, req_seq)) { |
| 1692 | drm_vblank_put(dev, pipe); |
| 1693 | send_vblank_event(dev, e, seq, now); |
| 1694 | vblwait->reply.sequence = seq; |
| 1695 | } else { |
| 1696 | /* drm_handle_vblank_events will call drm_vblank_put */ |
| 1697 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
| 1698 | vblwait->reply.sequence = req_seq; |
| 1699 | } |
| 1700 | |
| 1701 | spin_unlock_irq(&dev->event_lock)mtx_leave(&dev->event_lock); |
| 1702 | |
| 1703 | return 0; |
| 1704 | |
| 1705 | err_unlock: |
| 1706 | spin_unlock_irq(&dev->event_lock)mtx_leave(&dev->event_lock); |
| 1707 | kfree(e); |
| 1708 | err_put: |
| 1709 | drm_vblank_put(dev, pipe); |
| 1710 | return ret; |
| 1711 | } |
| 1712 | |
| 1713 | static bool_Bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait) |
| 1714 | { |
| 1715 | if (vblwait->request.sequence) |
| 1716 | return false0; |
| 1717 | |
| 1718 | return _DRM_VBLANK_RELATIVE == |
| 1719 | (vblwait->request.type & (_DRM_VBLANK_TYPES_MASK(_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE) | |
| 1720 | _DRM_VBLANK_EVENT | |
| 1721 | _DRM_VBLANK_NEXTONMISS)); |
| 1722 | } |
| 1723 | |
| 1724 | /* |
| 1725 | * Widen a 32-bit param to 64-bits. |
| 1726 | * |
| 1727 | * \param narrow 32-bit value (missing upper 32 bits) |
| 1728 | * \param near 64-bit value that should be 'close' to near |
| 1729 | * |
| 1730 | * This function returns a 64-bit value using the lower 32-bits from |
| 1731 | * 'narrow' and constructing the upper 32-bits so that the result is |
| 1732 | * as close as possible to 'near'. |
| 1733 | */ |
| 1734 | |
| 1735 | static u64 widen_32_to_64(u32 narrow, u64 near) |
| 1736 | { |
| 1737 | return near + (s32) (narrow - near); |
| 1738 | } |
| 1739 | |
| 1740 | static void drm_wait_vblank_reply(struct drm_device *dev, unsigned int pipe, |
| 1741 | struct drm_wait_vblank_reply *reply) |
| 1742 | { |
| 1743 | ktime_t now; |
| 1744 | struct timespec64 ts; |
| 1745 | |
| 1746 | /* |
| 1747 | * drm_wait_vblank_reply is a UAPI structure that uses 'long' |
| 1748 | * to store the seconds. This is safe as we always use monotonic |
| 1749 | * timestamps since linux-4.15. |
| 1750 | */ |
| 1751 | reply->sequence = drm_vblank_count_and_time(dev, pipe, &now); |
| 1752 | ts = ktime_to_timespec64(now); |
| 1753 | reply->tval_sec = (u32)ts.tv_sec; |
| 1754 | reply->tval_usec = ts.tv_nsec / 1000; |
| 1755 | } |
| 1756 | |
| 1757 | static bool_Bool drm_wait_vblank_supported(struct drm_device *dev) |
| 1758 | { |
| 1759 | #if IS_ENABLED(CONFIG_DRM_LEGACY)0 |
| 1760 | if (unlikely(drm_core_check_feature(dev, DRIVER_LEGACY))__builtin_expect(!!(drm_core_check_feature(dev, DRIVER_LEGACY )), 0)) |
| 1761 | return dev->irq_enabled; |
| 1762 | #endif |
| 1763 | return drm_dev_has_vblank(dev); |
| 1764 | } |
| 1765 | |
| 1766 | int drm_wait_vblank_ioctl(struct drm_device *dev, void *data, |
| 1767 | struct drm_file *file_priv) |
| 1768 | { |
| 1769 | struct drm_crtc *crtc; |
| 1770 | struct drm_vblank_crtc *vblank; |
| 1771 | union drm_wait_vblank *vblwait = data; |
| 1772 | int ret; |
| 1773 | u64 req_seq, seq; |
| 1774 | unsigned int pipe_index; |
| 1775 | unsigned int flags, pipe, high_pipe; |
| 1776 | |
| 1777 | if (!drm_wait_vblank_supported(dev)) |
| 1778 | return -EOPNOTSUPP45; |
| 1779 | |
| 1780 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
| 1781 | return -EINVAL22; |
| 1782 | |
| 1783 | if (vblwait->request.type & |
| 1784 | ~(_DRM_VBLANK_TYPES_MASK(_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE) | _DRM_VBLANK_FLAGS_MASK(_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS) | |
| 1785 | _DRM_VBLANK_HIGH_CRTC_MASK)) { |
| 1786 | drm_dbg_core(dev,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "Unsupported type value 0x%x, supported mask 0x%x\n" , vblwait->request.type, ((_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE ) | (_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS) | _DRM_VBLANK_HIGH_CRTC_MASK)) |
| 1787 | "Unsupported type value 0x%x, supported mask 0x%x\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "Unsupported type value 0x%x, supported mask 0x%x\n" , vblwait->request.type, ((_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE ) | (_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS) | _DRM_VBLANK_HIGH_CRTC_MASK)) |
| 1788 | vblwait->request.type,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "Unsupported type value 0x%x, supported mask 0x%x\n" , vblwait->request.type, ((_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE ) | (_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS) | _DRM_VBLANK_HIGH_CRTC_MASK)) |
| 1789 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "Unsupported type value 0x%x, supported mask 0x%x\n" , vblwait->request.type, ((_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE ) | (_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS) | _DRM_VBLANK_HIGH_CRTC_MASK)) |
| 1790 | _DRM_VBLANK_HIGH_CRTC_MASK))__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "Unsupported type value 0x%x, supported mask 0x%x\n" , vblwait->request.type, ((_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE ) | (_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS) | _DRM_VBLANK_HIGH_CRTC_MASK)); |
| 1791 | return -EINVAL22; |
| 1792 | } |
| 1793 | |
| 1794 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK(_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS); |
| 1795 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
| 1796 | if (high_pipe) |
| 1797 | pipe_index = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT1; |
| 1798 | else |
| 1799 | pipe_index = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
| 1800 | |
| 1801 | /* Convert lease-relative crtc index into global crtc index */ |
| 1802 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
| 1803 | pipe = 0; |
| 1804 | drm_for_each_crtc(crtc, dev)for (crtc = ({ const __typeof( ((__typeof(*crtc) *)0)->head ) *__mptr = ((&(dev)->mode_config.crtc_list)->next ); (__typeof(*crtc) *)( (char *)__mptr - __builtin_offsetof(__typeof (*crtc), head) );}); &crtc->head != (&(dev)->mode_config .crtc_list); crtc = ({ const __typeof( ((__typeof(*crtc) *)0) ->head ) *__mptr = (crtc->head.next); (__typeof(*crtc) * )( (char *)__mptr - __builtin_offsetof(__typeof(*crtc), head) );})) { |
| 1805 | if (drm_lease_held(file_priv, crtc->base.id)(1)) { |
| 1806 | if (pipe_index == 0) |
| 1807 | break; |
| 1808 | pipe_index--; |
| 1809 | } |
| 1810 | pipe++; |
| 1811 | } |
| 1812 | } else { |
| 1813 | pipe = pipe_index; |
| 1814 | } |
| 1815 | |
| 1816 | if (pipe >= dev->num_crtcs) |
| 1817 | return -EINVAL22; |
| 1818 | |
| 1819 | vblank = &dev->vblank[pipe]; |
| 1820 | |
| 1821 | /* If the counter is currently enabled and accurate, short-circuit |
| 1822 | * queries to return the cached timestamp of the last vblank. |
| 1823 | */ |
| 1824 | if (dev->vblank_disable_immediate && |
| 1825 | drm_wait_vblank_is_query(vblwait) && |
| 1826 | READ_ONCE(vblank->enabled)({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank ->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; })) { |
| 1827 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
| 1828 | return 0; |
| 1829 | } |
| 1830 | |
| 1831 | ret = drm_vblank_get(dev, pipe); |
| 1832 | if (ret) { |
| 1833 | drm_dbg_core(dev,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret) |
| 1834 | "crtc %d failed to acquire vblank counter, %d\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret) |
| 1835 | pipe, ret)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret); |
| 1836 | return ret; |
| 1837 | } |
| 1838 | seq = drm_vblank_count(dev, pipe); |
| 1839 | |
| 1840 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK(_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE)) { |
| 1841 | case _DRM_VBLANK_RELATIVE: |
| 1842 | req_seq = seq + vblwait->request.sequence; |
| 1843 | vblwait->request.sequence = req_seq; |
| 1844 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; |
| 1845 | break; |
| 1846 | case _DRM_VBLANK_ABSOLUTE: |
| 1847 | req_seq = widen_32_to_64(vblwait->request.sequence, seq); |
| 1848 | break; |
| 1849 | default: |
| 1850 | ret = -EINVAL22; |
| 1851 | goto done; |
| 1852 | } |
| 1853 | |
| 1854 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
| 1855 | drm_vblank_passed(seq, req_seq)) { |
| 1856 | req_seq = seq + 1; |
| 1857 | vblwait->request.type &= ~_DRM_VBLANK_NEXTONMISS; |
| 1858 | vblwait->request.sequence = req_seq; |
| 1859 | } |
| 1860 | |
| 1861 | if (flags & _DRM_VBLANK_EVENT) { |
| 1862 | /* must hold on to the vblank ref until the event fires |
| 1863 | * drm_vblank_put will be called asynchronously |
| 1864 | */ |
| 1865 | return drm_queue_vblank_event(dev, pipe, req_seq, vblwait, file_priv); |
| 1866 | } |
| 1867 | |
| 1868 | if (req_seq != seq) { |
| 1869 | int wait; |
| 1870 | |
| 1871 | drm_dbg_core(dev, "waiting on vblank count %llu, crtc %u\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "waiting on vblank count %llu, crtc %u\n", req_seq , pipe) |
| 1872 | req_seq, pipe)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "waiting on vblank count %llu, crtc %u\n", req_seq , pipe); |
| 1873 | wait = wait_event_interruptible_timeout(vblank->queue,({ long __ret = (((uint64_t)(3000)) * hz / 1000); if (!(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; }))) __ret = ({ long __ret = (((uint64_t)(3000)) * hz / 1000); struct wait_queue_entry __wq_entry; init_wait_entry(&__wq_entry, 0); do { int __error , __wait; unsigned long deadline; ((!cold) ? (void)0 : __assert ("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_vblank.c", 1876 , "!cold")); prepare_to_wait(&vblank->queue, &__wq_entry , 0x100); deadline = jiffies + __ret; __wait = !(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; })); __error = sleep_finish(__ret, __wait); if (((((uint64_t)(3000)) * hz / 1000)) > 0) __ret = deadline - jiffies; if (__error == - 1 || __error == 4) { __ret = -4; break; } if (((((uint64_t)(3000 )) * hz / 1000)) > 0 && (__ret <= 0 || __error == 35)) { __ret = ((drm_vblank_passed(drm_vblank_count(dev, pipe ), req_seq) || !({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }))) ? 1 : 0; break; } } while (__ret > 0 && !(drm_vblank_passed(drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank ->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }))); finish_wait(&vblank->queue, &__wq_entry ); __ret; }); __ret; }) |
| 1874 | drm_vblank_passed(drm_vblank_count(dev, pipe), req_seq) ||({ long __ret = (((uint64_t)(3000)) * hz / 1000); if (!(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; }))) __ret = ({ long __ret = (((uint64_t)(3000)) * hz / 1000); struct wait_queue_entry __wq_entry; init_wait_entry(&__wq_entry, 0); do { int __error , __wait; unsigned long deadline; ((!cold) ? (void)0 : __assert ("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_vblank.c", 1876 , "!cold")); prepare_to_wait(&vblank->queue, &__wq_entry , 0x100); deadline = jiffies + __ret; __wait = !(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; })); __error = sleep_finish(__ret, __wait); if (((((uint64_t)(3000)) * hz / 1000)) > 0) __ret = deadline - jiffies; if (__error == - 1 || __error == 4) { __ret = -4; break; } if (((((uint64_t)(3000 )) * hz / 1000)) > 0 && (__ret <= 0 || __error == 35)) { __ret = ((drm_vblank_passed(drm_vblank_count(dev, pipe ), req_seq) || !({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }))) ? 1 : 0; break; } } while (__ret > 0 && !(drm_vblank_passed(drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank ->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }))); finish_wait(&vblank->queue, &__wq_entry ); __ret; }); __ret; }) |
| 1875 | !READ_ONCE(vblank->enabled),({ long __ret = (((uint64_t)(3000)) * hz / 1000); if (!(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; }))) __ret = ({ long __ret = (((uint64_t)(3000)) * hz / 1000); struct wait_queue_entry __wq_entry; init_wait_entry(&__wq_entry, 0); do { int __error , __wait; unsigned long deadline; ((!cold) ? (void)0 : __assert ("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_vblank.c", 1876 , "!cold")); prepare_to_wait(&vblank->queue, &__wq_entry , 0x100); deadline = jiffies + __ret; __wait = !(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; })); __error = sleep_finish(__ret, __wait); if (((((uint64_t)(3000)) * hz / 1000)) > 0) __ret = deadline - jiffies; if (__error == - 1 || __error == 4) { __ret = -4; break; } if (((((uint64_t)(3000 )) * hz / 1000)) > 0 && (__ret <= 0 || __error == 35)) { __ret = ((drm_vblank_passed(drm_vblank_count(dev, pipe ), req_seq) || !({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }))) ? 1 : 0; break; } } while (__ret > 0 && !(drm_vblank_passed(drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank ->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }))); finish_wait(&vblank->queue, &__wq_entry ); __ret; }); __ret; }) |
| 1876 | msecs_to_jiffies(3000))({ long __ret = (((uint64_t)(3000)) * hz / 1000); if (!(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; }))) __ret = ({ long __ret = (((uint64_t)(3000)) * hz / 1000); struct wait_queue_entry __wq_entry; init_wait_entry(&__wq_entry, 0); do { int __error , __wait; unsigned long deadline; ((!cold) ? (void)0 : __assert ("diagnostic ", "/usr/src/sys/dev/pci/drm/drm_vblank.c", 1876 , "!cold")); prepare_to_wait(&vblank->queue, &__wq_entry , 0x100); deadline = jiffies + __ret; __wait = !(drm_vblank_passed (drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank-> enabled) __tmp = *(volatile typeof(vblank->enabled) *)& (vblank->enabled); membar_datadep_consumer(); __tmp; })); __error = sleep_finish(__ret, __wait); if (((((uint64_t)(3000)) * hz / 1000)) > 0) __ret = deadline - jiffies; if (__error == - 1 || __error == 4) { __ret = -4; break; } if (((((uint64_t)(3000 )) * hz / 1000)) > 0 && (__ret <= 0 || __error == 35)) { __ret = ((drm_vblank_passed(drm_vblank_count(dev, pipe ), req_seq) || !({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }))) ? 1 : 0; break; } } while (__ret > 0 && !(drm_vblank_passed(drm_vblank_count(dev, pipe), req_seq) || !({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank ->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }))); finish_wait(&vblank->queue, &__wq_entry ); __ret; }); __ret; }); |
| 1877 | |
| 1878 | switch (wait) { |
| 1879 | case 0: |
| 1880 | /* timeout */ |
| 1881 | ret = -EBUSY16; |
| 1882 | break; |
| 1883 | case -ERESTARTSYS4: |
| 1884 | /* interrupted by signal */ |
| 1885 | ret = -EINTR4; |
| 1886 | break; |
| 1887 | default: |
| 1888 | ret = 0; |
| 1889 | break; |
| 1890 | } |
| 1891 | } |
| 1892 | |
| 1893 | if (ret != -EINTR4) { |
| 1894 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
| 1895 | |
| 1896 | drm_dbg_core(dev, "crtc %d returning %u to client\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %d returning %u to client\n", pipe, vblwait ->reply.sequence) |
| 1897 | pipe, vblwait->reply.sequence)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %d returning %u to client\n", pipe, vblwait ->reply.sequence); |
| 1898 | } else { |
| 1899 | drm_dbg_core(dev, "crtc %d vblank wait interrupted by signal\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %d vblank wait interrupted by signal\n" , pipe) |
| 1900 | pipe)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %d vblank wait interrupted by signal\n" , pipe); |
| 1901 | } |
| 1902 | |
| 1903 | done: |
| 1904 | drm_vblank_put(dev, pipe); |
| 1905 | return ret; |
| 1906 | } |
| 1907 | |
| 1908 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) |
| 1909 | { |
| 1910 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
| 1911 | bool_Bool high_prec = false0; |
| 1912 | struct drm_pending_vblank_event *e, *t; |
| 1913 | ktime_t now; |
| 1914 | u64 seq; |
| 1915 | |
| 1916 | assert_spin_locked(&dev->event_lock)do { if (((&dev->event_lock)->mtx_owner != ({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci ) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci; })) && !(panicstr || db_active)) panic("mutex %p not held in %s" , (&dev->event_lock), __func__); } while (0); |
| 1917 | |
| 1918 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
| 1919 | |
| 1920 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link)for (e = ({ const __typeof( ((__typeof(*e) *)0)->base.link ) *__mptr = ((&dev->vblank_event_list)->next); (__typeof (*e) *)( (char *)__mptr - __builtin_offsetof(__typeof(*e), base .link) );}), t = ({ const __typeof( ((__typeof(*e) *)0)->base .link ) *__mptr = (e->base.link.next); (__typeof(*e) *)( ( char *)__mptr - __builtin_offsetof(__typeof(*e), base.link) ) ;}); &e->base.link != (&dev->vblank_event_list) ; e = t, t = ({ const __typeof( ((__typeof(*t) *)0)->base. link ) *__mptr = (t->base.link.next); (__typeof(*t) *)( (char *)__mptr - __builtin_offsetof(__typeof(*t), base.link) );})) { |
| 1921 | if (e->pipe != pipe) |
| 1922 | continue; |
| 1923 | if (!drm_vblank_passed(seq, e->sequence)) |
| 1924 | continue; |
| 1925 | |
| 1926 | drm_dbg_core(dev, "vblank event on %llu, current %llu\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "vblank event on %llu, current %llu\n", e-> sequence, seq) |
| 1927 | e->sequence, seq)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "vblank event on %llu, current %llu\n", e-> sequence, seq); |
| 1928 | |
| 1929 | list_del(&e->base.link); |
| 1930 | drm_vblank_put(dev, pipe); |
| 1931 | send_vblank_event(dev, e, seq, now); |
| 1932 | } |
| 1933 | |
| 1934 | if (crtc && crtc->funcs->get_vblank_timestamp) |
| 1935 | high_prec = true1; |
Value stored to 'high_prec' is never read | |
| 1936 | |
| 1937 | trace_drm_vblank_event(pipe, seq, now, high_prec); |
| 1938 | } |
| 1939 | |
| 1940 | /** |
| 1941 | * drm_handle_vblank - handle a vblank event |
| 1942 | * @dev: DRM device |
| 1943 | * @pipe: index of CRTC where this event occurred |
| 1944 | * |
| 1945 | * Drivers should call this routine in their vblank interrupt handlers to |
| 1946 | * update the vblank counter and send any signals that may be pending. |
| 1947 | * |
| 1948 | * This is the legacy version of drm_crtc_handle_vblank(). |
| 1949 | */ |
| 1950 | bool_Bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) |
| 1951 | { |
| 1952 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
| 1953 | unsigned long irqflags; |
| 1954 | bool_Bool disable_irq; |
| 1955 | |
| 1956 | if (drm_WARN_ON_ONCE(dev, !drm_dev_has_vblank(dev))({ static int __warned; int __ret = !!((!drm_dev_has_vblank(dev ))); if (__ret && !__warned) { printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "", "drm_WARN_ON_ONCE(" "!drm_dev_has_vblank(dev)" ")"); __warned = 1; } __builtin_expect(!!(__ret), 0); })) |
| 1957 | return false0; |
| 1958 | |
| 1959 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)({ int __ret = !!((pipe >= dev->num_crtcs)); if (__ret) printf("%s %s: " "%s", dev_driver_string(((dev))->dev), "" , "drm_WARN_ON(" "pipe >= dev->num_crtcs" ")"); __builtin_expect (!!(__ret), 0); })) |
| 1960 | return false0; |
| 1961 | |
| 1962 | spin_lock_irqsave(&dev->event_lock, irqflags)do { irqflags = 0; mtx_enter(&dev->event_lock); } while (0); |
| 1963 | |
| 1964 | /* Need timestamp lock to prevent concurrent execution with |
| 1965 | * vblank enable/disable, as this would cause inconsistent |
| 1966 | * or corrupted timestamps and vblank counts. |
| 1967 | */ |
| 1968 | spin_lock(&dev->vblank_time_lock)mtx_enter(&dev->vblank_time_lock); |
| 1969 | |
| 1970 | /* Vblank irq handling disabled. Nothing to do. */ |
| 1971 | if (!vblank->enabled) { |
| 1972 | spin_unlock(&dev->vblank_time_lock)mtx_leave(&dev->vblank_time_lock); |
| 1973 | spin_unlock_irqrestore(&dev->event_lock, irqflags)do { (void)(irqflags); mtx_leave(&dev->event_lock); } while (0); |
| 1974 | return false0; |
| 1975 | } |
| 1976 | |
| 1977 | drm_update_vblank_count(dev, pipe, true1); |
| 1978 | |
| 1979 | spin_unlock(&dev->vblank_time_lock)mtx_leave(&dev->vblank_time_lock); |
| 1980 | |
| 1981 | wake_up(&vblank->queue); |
| 1982 | |
| 1983 | /* With instant-off, we defer disabling the interrupt until after |
| 1984 | * we finish processing the following vblank after all events have |
| 1985 | * been signaled. The disable has to be last (after |
| 1986 | * drm_handle_vblank_events) so that the timestamp is always accurate. |
| 1987 | */ |
| 1988 | disable_irq = (dev->vblank_disable_immediate && |
| 1989 | drm_vblank_offdelay > 0 && |
| 1990 | !atomic_read(&vblank->refcount)({ typeof(*(&vblank->refcount)) __tmp = *(volatile typeof (*(&vblank->refcount)) *)&(*(&vblank->refcount )); membar_datadep_consumer(); __tmp; })); |
| 1991 | |
| 1992 | drm_handle_vblank_events(dev, pipe); |
| 1993 | drm_handle_vblank_works(vblank); |
| 1994 | |
| 1995 | spin_unlock_irqrestore(&dev->event_lock, irqflags)do { (void)(irqflags); mtx_leave(&dev->event_lock); } while (0); |
| 1996 | |
| 1997 | if (disable_irq) |
| 1998 | vblank_disable_fn(vblank); |
| 1999 | |
| 2000 | return true1; |
| 2001 | } |
| 2002 | EXPORT_SYMBOL(drm_handle_vblank); |
| 2003 | |
| 2004 | /** |
| 2005 | * drm_crtc_handle_vblank - handle a vblank event |
| 2006 | * @crtc: where this event occurred |
| 2007 | * |
| 2008 | * Drivers should call this routine in their vblank interrupt handlers to |
| 2009 | * update the vblank counter and send any signals that may be pending. |
| 2010 | * |
| 2011 | * This is the native KMS version of drm_handle_vblank(). |
| 2012 | * |
| 2013 | * Note that for a given vblank counter value drm_crtc_handle_vblank() |
| 2014 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() |
| 2015 | * provide a barrier: Any writes done before calling |
| 2016 | * drm_crtc_handle_vblank() will be visible to callers of the later |
| 2017 | * functions, if the vblank count is the same or a later one. |
| 2018 | * |
| 2019 | * See also &drm_vblank_crtc.count. |
| 2020 | * |
| 2021 | * Returns: |
| 2022 | * True if the event was successfully handled, false on failure. |
| 2023 | */ |
| 2024 | bool_Bool drm_crtc_handle_vblank(struct drm_crtc *crtc) |
| 2025 | { |
| 2026 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); |
| 2027 | } |
| 2028 | EXPORT_SYMBOL(drm_crtc_handle_vblank); |
| 2029 | |
| 2030 | /* |
| 2031 | * Get crtc VBLANK count. |
| 2032 | * |
| 2033 | * \param dev DRM device |
| 2034 | * \param data user argument, pointing to a drm_crtc_get_sequence structure. |
| 2035 | * \param file_priv drm file private for the user's open file descriptor |
| 2036 | */ |
| 2037 | |
| 2038 | int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data, |
| 2039 | struct drm_file *file_priv) |
| 2040 | { |
| 2041 | struct drm_crtc *crtc; |
| 2042 | struct drm_vblank_crtc *vblank; |
| 2043 | int pipe; |
| 2044 | struct drm_crtc_get_sequence *get_seq = data; |
| 2045 | ktime_t now; |
| 2046 | bool_Bool vblank_enabled; |
| 2047 | int ret; |
| 2048 | |
| 2049 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| 2050 | return -EOPNOTSUPP45; |
| 2051 | |
| 2052 | if (!drm_dev_has_vblank(dev)) |
| 2053 | return -EOPNOTSUPP45; |
| 2054 | |
| 2055 | crtc = drm_crtc_find(dev, file_priv, get_seq->crtc_id); |
| 2056 | if (!crtc) |
| 2057 | return -ENOENT2; |
| 2058 | |
| 2059 | pipe = drm_crtc_index(crtc); |
| 2060 | |
| 2061 | vblank = &dev->vblank[pipe]; |
| 2062 | vblank_enabled = dev->vblank_disable_immediate && READ_ONCE(vblank->enabled)({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank ->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; }); |
| 2063 | |
| 2064 | if (!vblank_enabled) { |
| 2065 | ret = drm_crtc_vblank_get(crtc); |
| 2066 | if (ret) { |
| 2067 | drm_dbg_core(dev,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret) |
| 2068 | "crtc %d failed to acquire vblank counter, %d\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret) |
| 2069 | pipe, ret)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret); |
| 2070 | return ret; |
| 2071 | } |
| 2072 | } |
| 2073 | drm_modeset_lock(&crtc->mutex, NULL((void *)0)); |
| 2074 | if (crtc->state) |
| 2075 | get_seq->active = crtc->state->enable; |
| 2076 | else |
| 2077 | get_seq->active = crtc->enabled; |
| 2078 | drm_modeset_unlock(&crtc->mutex); |
| 2079 | get_seq->sequence = drm_vblank_count_and_time(dev, pipe, &now); |
| 2080 | get_seq->sequence_ns = ktime_to_ns(now); |
| 2081 | if (!vblank_enabled) |
| 2082 | drm_crtc_vblank_put(crtc); |
| 2083 | return 0; |
| 2084 | } |
| 2085 | |
| 2086 | /* |
| 2087 | * Queue a event for VBLANK sequence |
| 2088 | * |
| 2089 | * \param dev DRM device |
| 2090 | * \param data user argument, pointing to a drm_crtc_queue_sequence structure. |
| 2091 | * \param file_priv drm file private for the user's open file descriptor |
| 2092 | */ |
| 2093 | |
| 2094 | int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data, |
| 2095 | struct drm_file *file_priv) |
| 2096 | { |
| 2097 | struct drm_crtc *crtc; |
| 2098 | struct drm_vblank_crtc *vblank; |
| 2099 | int pipe; |
| 2100 | struct drm_crtc_queue_sequence *queue_seq = data; |
| 2101 | ktime_t now; |
| 2102 | struct drm_pending_vblank_event *e; |
| 2103 | u32 flags; |
| 2104 | u64 seq; |
| 2105 | u64 req_seq; |
| 2106 | int ret; |
| 2107 | |
| 2108 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| 2109 | return -EOPNOTSUPP45; |
| 2110 | |
| 2111 | if (!drm_dev_has_vblank(dev)) |
| 2112 | return -EOPNOTSUPP45; |
| 2113 | |
| 2114 | crtc = drm_crtc_find(dev, file_priv, queue_seq->crtc_id); |
| 2115 | if (!crtc) |
| 2116 | return -ENOENT2; |
| 2117 | |
| 2118 | flags = queue_seq->flags; |
| 2119 | /* Check valid flag bits */ |
| 2120 | if (flags & ~(DRM_CRTC_SEQUENCE_RELATIVE0x00000001| |
| 2121 | DRM_CRTC_SEQUENCE_NEXT_ON_MISS0x00000002)) |
| 2122 | return -EINVAL22; |
| 2123 | |
| 2124 | pipe = drm_crtc_index(crtc); |
| 2125 | |
| 2126 | vblank = &dev->vblank[pipe]; |
| 2127 | |
| 2128 | e = kzalloc(sizeof(*e), GFP_KERNEL(0x0001 | 0x0004)); |
| 2129 | if (e == NULL((void *)0)) |
| 2130 | return -ENOMEM12; |
| 2131 | |
| 2132 | ret = drm_crtc_vblank_get(crtc); |
| 2133 | if (ret) { |
| 2134 | drm_dbg_core(dev,__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret) |
| 2135 | "crtc %d failed to acquire vblank counter, %d\n",__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret) |
| 2136 | pipe, ret)__drm_dev_dbg(((void *)0), (dev) ? (dev)->dev : ((void *)0 ), DRM_UT_CORE, "crtc %d failed to acquire vblank counter, %d\n" , pipe, ret); |
| 2137 | goto err_free; |
| 2138 | } |
| 2139 | |
| 2140 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
| 2141 | req_seq = queue_seq->sequence; |
| 2142 | |
| 2143 | if (flags & DRM_CRTC_SEQUENCE_RELATIVE0x00000001) |
| 2144 | req_seq += seq; |
| 2145 | |
| 2146 | if ((flags & DRM_CRTC_SEQUENCE_NEXT_ON_MISS0x00000002) && drm_vblank_passed(seq, req_seq)) |
| 2147 | req_seq = seq + 1; |
| 2148 | |
| 2149 | e->pipe = pipe; |
| 2150 | e->event.base.type = DRM_EVENT_CRTC_SEQUENCE0x03; |
| 2151 | e->event.base.length = sizeof(e->event.seq); |
| 2152 | e->event.seq.user_data = queue_seq->user_data; |
| 2153 | |
| 2154 | spin_lock_irq(&dev->event_lock)mtx_enter(&dev->event_lock); |
| 2155 | |
| 2156 | /* |
| 2157 | * drm_crtc_vblank_off() might have been called after we called |
| 2158 | * drm_crtc_vblank_get(). drm_crtc_vblank_off() holds event_lock around the |
| 2159 | * vblank disable, so no need for further locking. The reference from |
| 2160 | * drm_crtc_vblank_get() protects against vblank disable from another source. |
| 2161 | */ |
| 2162 | if (!READ_ONCE(vblank->enabled)({ typeof(vblank->enabled) __tmp = *(volatile typeof(vblank ->enabled) *)&(vblank->enabled); membar_datadep_consumer (); __tmp; })) { |
| 2163 | ret = -EINVAL22; |
| 2164 | goto err_unlock; |
| 2165 | } |
| 2166 | |
| 2167 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, |
| 2168 | &e->event.base); |
| 2169 | |
| 2170 | if (ret) |
| 2171 | goto err_unlock; |
| 2172 | |
| 2173 | e->sequence = req_seq; |
| 2174 | |
| 2175 | if (drm_vblank_passed(seq, req_seq)) { |
| 2176 | drm_crtc_vblank_put(crtc); |
| 2177 | send_vblank_event(dev, e, seq, now); |
| 2178 | queue_seq->sequence = seq; |
| 2179 | } else { |
| 2180 | /* drm_handle_vblank_events will call drm_vblank_put */ |
| 2181 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
| 2182 | queue_seq->sequence = req_seq; |
| 2183 | } |
| 2184 | |
| 2185 | spin_unlock_irq(&dev->event_lock)mtx_leave(&dev->event_lock); |
| 2186 | return 0; |
| 2187 | |
| 2188 | err_unlock: |
| 2189 | spin_unlock_irq(&dev->event_lock)mtx_leave(&dev->event_lock); |
| 2190 | drm_crtc_vblank_put(crtc); |
| 2191 | err_free: |
| 2192 | kfree(e); |
| 2193 | return ret; |
| 2194 | } |
| 2195 |