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3ed4351a DV |
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 <drm/drm_vblank.h> | |
28 | #include <drm/drmP.h> | |
29 | #include <linux/export.h> | |
30 | ||
31 | #include "drm_trace.h" | |
32 | #include "drm_internal.h" | |
33 | ||
34 | /* Retry timestamp calculation up to 3 times to satisfy | |
35 | * drm_timestamp_precision before giving up. | |
36 | */ | |
37 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
38 | ||
39 | /* Threshold in nanoseconds for detection of redundant | |
40 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
41 | */ | |
42 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
43 | ||
44 | static bool | |
45 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
46 | struct timeval *tvblank, bool in_vblank_irq); | |
47 | ||
48 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ | |
49 | ||
50 | /* | |
51 | * Default to use monotonic timestamps for wait-for-vblank and page-flip | |
52 | * complete events. | |
53 | */ | |
54 | unsigned int drm_timestamp_monotonic = 1; | |
55 | ||
56 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ | |
57 | ||
58 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
59 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
60 | module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600); | |
61 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); | |
62 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); | |
63 | MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps"); | |
64 | ||
65 | static void store_vblank(struct drm_device *dev, unsigned int pipe, | |
66 | u32 vblank_count_inc, | |
67 | struct timeval *t_vblank, u32 last) | |
68 | { | |
69 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
70 | ||
71 | assert_spin_locked(&dev->vblank_time_lock); | |
72 | ||
73 | vblank->last = last; | |
74 | ||
75 | write_seqlock(&vblank->seqlock); | |
76 | vblank->time = *t_vblank; | |
77 | vblank->count += vblank_count_inc; | |
78 | write_sequnlock(&vblank->seqlock); | |
79 | } | |
80 | ||
81 | /* | |
82 | * "No hw counter" fallback implementation of .get_vblank_counter() hook, | |
83 | * if there is no useable hardware frame counter available. | |
84 | */ | |
85 | static u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) | |
86 | { | |
87 | WARN_ON_ONCE(dev->max_vblank_count != 0); | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe) | |
92 | { | |
93 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
94 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
95 | ||
96 | if (crtc->funcs->get_vblank_counter) | |
97 | return crtc->funcs->get_vblank_counter(crtc); | |
98 | } | |
99 | ||
100 | if (dev->driver->get_vblank_counter) | |
101 | return dev->driver->get_vblank_counter(dev, pipe); | |
102 | ||
103 | return drm_vblank_no_hw_counter(dev, pipe); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Reset the stored timestamp for the current vblank count to correspond | |
108 | * to the last vblank occurred. | |
109 | * | |
110 | * Only to be called from drm_crtc_vblank_on(). | |
111 | * | |
112 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes | |
113 | * device vblank fields. | |
114 | */ | |
115 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) | |
116 | { | |
117 | u32 cur_vblank; | |
118 | bool rc; | |
119 | struct timeval t_vblank; | |
120 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
121 | ||
122 | spin_lock(&dev->vblank_time_lock); | |
123 | ||
124 | /* | |
125 | * sample the current counter to avoid random jumps | |
126 | * when drm_vblank_enable() applies the diff | |
127 | */ | |
128 | do { | |
129 | cur_vblank = __get_vblank_counter(dev, pipe); | |
130 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false); | |
131 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
132 | ||
133 | /* | |
134 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
135 | * available and didn't fail. Otherwise reinitialize delayed at next vblank | |
136 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
137 | */ | |
138 | if (!rc) | |
139 | t_vblank = (struct timeval) {0, 0}; | |
140 | ||
141 | /* | |
142 | * +1 to make sure user will never see the same | |
143 | * vblank counter value before and after a modeset | |
144 | */ | |
145 | store_vblank(dev, pipe, 1, &t_vblank, cur_vblank); | |
146 | ||
147 | spin_unlock(&dev->vblank_time_lock); | |
148 | } | |
149 | ||
150 | /* | |
151 | * Call back into the driver to update the appropriate vblank counter | |
152 | * (specified by @pipe). Deal with wraparound, if it occurred, and | |
153 | * update the last read value so we can deal with wraparound on the next | |
154 | * call if necessary. | |
155 | * | |
156 | * Only necessary when going from off->on, to account for frames we | |
157 | * didn't get an interrupt for. | |
158 | * | |
159 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes | |
160 | * device vblank fields. | |
161 | */ | |
162 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, | |
163 | bool in_vblank_irq) | |
164 | { | |
165 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
166 | u32 cur_vblank, diff; | |
167 | bool rc; | |
168 | struct timeval t_vblank; | |
169 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
170 | int framedur_ns = vblank->framedur_ns; | |
171 | ||
172 | /* | |
173 | * Interrupts were disabled prior to this call, so deal with counter | |
174 | * wrap if needed. | |
175 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events | |
176 | * here if the register is small or we had vblank interrupts off for | |
177 | * a long time. | |
178 | * | |
179 | * We repeat the hardware vblank counter & timestamp query until | |
180 | * we get consistent results. This to prevent races between gpu | |
181 | * updating its hardware counter while we are retrieving the | |
182 | * corresponding vblank timestamp. | |
183 | */ | |
184 | do { | |
185 | cur_vblank = __get_vblank_counter(dev, pipe); | |
186 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq); | |
187 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
188 | ||
189 | if (dev->max_vblank_count != 0) { | |
190 | /* trust the hw counter when it's around */ | |
191 | diff = (cur_vblank - vblank->last) & dev->max_vblank_count; | |
192 | } else if (rc && framedur_ns) { | |
193 | const struct timeval *t_old; | |
194 | u64 diff_ns; | |
195 | ||
196 | t_old = &vblank->time; | |
197 | diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old); | |
198 | ||
199 | /* | |
200 | * Figure out how many vblanks we've missed based | |
201 | * on the difference in the timestamps and the | |
202 | * frame/field duration. | |
203 | */ | |
204 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |
205 | ||
206 | if (diff == 0 && in_vblank_irq) | |
207 | DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored." | |
208 | " diff_ns = %lld, framedur_ns = %d)\n", | |
209 | pipe, (long long) diff_ns, framedur_ns); | |
210 | } else { | |
211 | /* some kind of default for drivers w/o accurate vbl timestamping */ | |
212 | diff = in_vblank_irq ? 1 : 0; | |
213 | } | |
214 | ||
215 | /* | |
216 | * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset | |
217 | * interval? If so then vblank irqs keep running and it will likely | |
218 | * happen that the hardware vblank counter is not trustworthy as it | |
219 | * might reset at some point in that interval and vblank timestamps | |
220 | * are not trustworthy either in that interval. Iow. this can result | |
221 | * in a bogus diff >> 1 which must be avoided as it would cause | |
222 | * random large forward jumps of the software vblank counter. | |
223 | */ | |
224 | if (diff > 1 && (vblank->inmodeset & 0x2)) { | |
225 | DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u" | |
226 | " due to pre-modeset.\n", pipe, diff); | |
227 | diff = 1; | |
228 | } | |
229 | ||
230 | DRM_DEBUG_VBL("updating vblank count on crtc %u:" | |
231 | " current=%u, diff=%u, hw=%u hw_last=%u\n", | |
232 | pipe, vblank->count, diff, cur_vblank, vblank->last); | |
233 | ||
234 | if (diff == 0) { | |
235 | WARN_ON_ONCE(cur_vblank != vblank->last); | |
236 | return; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
241 | * available and didn't fail, or we were called from the vblank interrupt. | |
242 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 | |
243 | * for now, to mark the vblanktimestamp as invalid. | |
244 | */ | |
138b87fa | 245 | if (!rc && !in_vblank_irq) |
3ed4351a DV |
246 | t_vblank = (struct timeval) {0, 0}; |
247 | ||
248 | store_vblank(dev, pipe, diff, &t_vblank, cur_vblank); | |
249 | } | |
250 | ||
251 | static u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe) | |
252 | { | |
253 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
254 | ||
255 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
256 | return 0; | |
257 | ||
258 | return vblank->count; | |
259 | } | |
260 | ||
261 | /** | |
262 | * drm_accurate_vblank_count - retrieve the master vblank counter | |
263 | * @crtc: which counter to retrieve | |
264 | * | |
265 | * This function is similar to @drm_crtc_vblank_count but this | |
266 | * function interpolates to handle a race with vblank irq's. | |
267 | * | |
268 | * This is mostly useful for hardware that can obtain the scanout | |
269 | * position, but doesn't have a frame counter. | |
270 | */ | |
271 | u32 drm_accurate_vblank_count(struct drm_crtc *crtc) | |
272 | { | |
273 | struct drm_device *dev = crtc->dev; | |
274 | unsigned int pipe = drm_crtc_index(crtc); | |
275 | u32 vblank; | |
276 | unsigned long flags; | |
277 | ||
278 | WARN(!dev->driver->get_vblank_timestamp, | |
279 | "This function requires support for accurate vblank timestamps."); | |
280 | ||
281 | spin_lock_irqsave(&dev->vblank_time_lock, flags); | |
282 | ||
283 | drm_update_vblank_count(dev, pipe, false); | |
284 | vblank = drm_vblank_count(dev, pipe); | |
285 | ||
286 | spin_unlock_irqrestore(&dev->vblank_time_lock, flags); | |
287 | ||
288 | return vblank; | |
289 | } | |
290 | EXPORT_SYMBOL(drm_accurate_vblank_count); | |
291 | ||
292 | static void __disable_vblank(struct drm_device *dev, unsigned int pipe) | |
293 | { | |
294 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
295 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
296 | ||
297 | if (crtc->funcs->disable_vblank) { | |
298 | crtc->funcs->disable_vblank(crtc); | |
299 | return; | |
300 | } | |
301 | } | |
302 | ||
303 | dev->driver->disable_vblank(dev, pipe); | |
304 | } | |
305 | ||
306 | /* | |
307 | * Disable vblank irq's on crtc, make sure that last vblank count | |
308 | * of hardware and corresponding consistent software vblank counter | |
309 | * are preserved, even if there are any spurious vblank irq's after | |
310 | * disable. | |
311 | */ | |
312 | void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) | |
313 | { | |
314 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
315 | unsigned long irqflags; | |
316 | ||
317 | assert_spin_locked(&dev->vbl_lock); | |
318 | ||
319 | /* Prevent vblank irq processing while disabling vblank irqs, | |
320 | * so no updates of timestamps or count can happen after we've | |
321 | * disabled. Needed to prevent races in case of delayed irq's. | |
322 | */ | |
323 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
324 | ||
325 | /* | |
326 | * Only disable vblank interrupts if they're enabled. This avoids | |
327 | * calling the ->disable_vblank() operation in atomic context with the | |
328 | * hardware potentially runtime suspended. | |
329 | */ | |
330 | if (vblank->enabled) { | |
331 | __disable_vblank(dev, pipe); | |
332 | vblank->enabled = false; | |
333 | } | |
334 | ||
335 | /* | |
336 | * Always update the count and timestamp to maintain the | |
337 | * appearance that the counter has been ticking all along until | |
338 | * this time. This makes the count account for the entire time | |
339 | * between drm_crtc_vblank_on() and drm_crtc_vblank_off(). | |
340 | */ | |
341 | drm_update_vblank_count(dev, pipe, false); | |
342 | ||
343 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
344 | } | |
345 | ||
346 | static void vblank_disable_fn(unsigned long arg) | |
347 | { | |
348 | struct drm_vblank_crtc *vblank = (void *)arg; | |
349 | struct drm_device *dev = vblank->dev; | |
350 | unsigned int pipe = vblank->pipe; | |
351 | unsigned long irqflags; | |
352 | ||
353 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
354 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
355 | DRM_DEBUG("disabling vblank on crtc %u\n", pipe); | |
356 | drm_vblank_disable_and_save(dev, pipe); | |
357 | } | |
358 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
359 | } | |
360 | ||
361 | /** | |
362 | * drm_vblank_cleanup - cleanup vblank support | |
363 | * @dev: DRM device | |
364 | * | |
365 | * This function cleans up any resources allocated in drm_vblank_init. | |
16584b20 DV |
366 | * |
367 | * Drivers which don't use drm_irq_install() need to set &drm_device.irq_enabled | |
368 | * themselves, to signal to the DRM core that vblank interrupts are enabled. | |
3ed4351a DV |
369 | */ |
370 | void drm_vblank_cleanup(struct drm_device *dev) | |
371 | { | |
372 | unsigned int pipe; | |
373 | ||
374 | /* Bail if the driver didn't call drm_vblank_init() */ | |
375 | if (dev->num_crtcs == 0) | |
376 | return; | |
377 | ||
378 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { | |
379 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
380 | ||
381 | WARN_ON(READ_ONCE(vblank->enabled) && | |
382 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
383 | ||
384 | del_timer_sync(&vblank->disable_timer); | |
385 | } | |
386 | ||
387 | kfree(dev->vblank); | |
388 | ||
389 | dev->num_crtcs = 0; | |
390 | } | |
391 | EXPORT_SYMBOL(drm_vblank_cleanup); | |
392 | ||
393 | /** | |
394 | * drm_vblank_init - initialize vblank support | |
395 | * @dev: DRM device | |
396 | * @num_crtcs: number of CRTCs supported by @dev | |
397 | * | |
398 | * This function initializes vblank support for @num_crtcs display pipelines. | |
399 | * | |
400 | * Returns: | |
401 | * Zero on success or a negative error code on failure. | |
402 | */ | |
403 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) | |
404 | { | |
405 | int ret = -ENOMEM; | |
406 | unsigned int i; | |
407 | ||
408 | spin_lock_init(&dev->vbl_lock); | |
409 | spin_lock_init(&dev->vblank_time_lock); | |
410 | ||
411 | dev->num_crtcs = num_crtcs; | |
412 | ||
413 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); | |
414 | if (!dev->vblank) | |
415 | goto err; | |
416 | ||
417 | for (i = 0; i < num_crtcs; i++) { | |
418 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; | |
419 | ||
420 | vblank->dev = dev; | |
421 | vblank->pipe = i; | |
422 | init_waitqueue_head(&vblank->queue); | |
423 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
424 | (unsigned long)vblank); | |
425 | seqlock_init(&vblank->seqlock); | |
426 | } | |
427 | ||
428 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); | |
429 | ||
430 | /* Driver specific high-precision vblank timestamping supported? */ | |
431 | if (dev->driver->get_vblank_timestamp) | |
432 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
433 | else | |
434 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
435 | ||
436 | /* Must have precise timestamping for reliable vblank instant disable */ | |
437 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
438 | dev->vblank_disable_immediate = false; | |
439 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
440 | "get_vblank_timestamp == NULL\n"); | |
441 | } | |
442 | ||
443 | return 0; | |
444 | ||
445 | err: | |
446 | dev->num_crtcs = 0; | |
447 | return ret; | |
448 | } | |
449 | EXPORT_SYMBOL(drm_vblank_init); | |
450 | ||
451 | /** | |
452 | * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC | |
453 | * @crtc: which CRTC's vblank waitqueue to retrieve | |
454 | * | |
455 | * This function returns a pointer to the vblank waitqueue for the CRTC. | |
456 | * Drivers can use this to implement vblank waits using wait_event() and related | |
457 | * functions. | |
458 | */ | |
459 | wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc) | |
460 | { | |
461 | return &crtc->dev->vblank[drm_crtc_index(crtc)].queue; | |
462 | } | |
463 | EXPORT_SYMBOL(drm_crtc_vblank_waitqueue); | |
464 | ||
465 | ||
466 | /** | |
467 | * drm_calc_timestamping_constants - calculate vblank timestamp constants | |
468 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
469 | * @mode: display mode containing the scanout timings | |
470 | * | |
471 | * Calculate and store various constants which are later | |
472 | * needed by vblank and swap-completion timestamping, e.g, | |
473 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
474 | * derived from CRTC's true scanout timing, so they take | |
475 | * things like panel scaling or other adjustments into account. | |
476 | */ | |
477 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, | |
478 | const struct drm_display_mode *mode) | |
479 | { | |
480 | struct drm_device *dev = crtc->dev; | |
481 | unsigned int pipe = drm_crtc_index(crtc); | |
482 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
483 | int linedur_ns = 0, framedur_ns = 0; | |
484 | int dotclock = mode->crtc_clock; | |
485 | ||
486 | if (!dev->num_crtcs) | |
487 | return; | |
488 | ||
489 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
490 | return; | |
491 | ||
492 | /* Valid dotclock? */ | |
493 | if (dotclock > 0) { | |
494 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; | |
495 | ||
496 | /* | |
497 | * Convert scanline length in pixels and video | |
498 | * dot clock to line duration and frame duration | |
499 | * in nanoseconds: | |
500 | */ | |
501 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
502 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
503 | ||
504 | /* | |
505 | * Fields of interlaced scanout modes are only half a frame duration. | |
506 | */ | |
507 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
508 | framedur_ns /= 2; | |
509 | } else | |
510 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", | |
511 | crtc->base.id); | |
512 | ||
513 | vblank->linedur_ns = linedur_ns; | |
514 | vblank->framedur_ns = framedur_ns; | |
515 | vblank->hwmode = *mode; | |
516 | ||
517 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
518 | crtc->base.id, mode->crtc_htotal, | |
519 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
520 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n", | |
521 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
522 | } | |
523 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
524 | ||
525 | /** | |
526 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper | |
527 | * @dev: DRM device | |
528 | * @pipe: index of CRTC whose vblank timestamp to retrieve | |
529 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
530 | * On return contains true maximum error of timestamp | |
531 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
532 | * @in_vblank_irq: | |
533 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
534 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
535 | * if flag is set. | |
536 | * | |
537 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
538 | * timings and current video scanout position of a CRTC. This can be called from | |
539 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
540 | * actual timestamping. | |
541 | * | |
542 | * Should return timestamps conforming to the OML_sync_control OpenML | |
543 | * extension specification. The timestamp corresponds to the end of | |
544 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
545 | * pixel in the following video frame. | |
546 | * | |
547 | * Requires support for optional dev->driver->get_scanout_position() | |
548 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
549 | * that corresponds to the true scanout timing. | |
550 | * | |
551 | * The current implementation only handles standard video modes. It | |
552 | * returns as no operation if a doublescan or interlaced video mode is | |
553 | * active. Higher level code is expected to handle this. | |
554 | * | |
555 | * This function can be used to implement the &drm_driver.get_vblank_timestamp | |
556 | * directly, if the driver implements the &drm_driver.get_scanout_position hook. | |
557 | * | |
558 | * Note that atomic drivers must call drm_calc_timestamping_constants() before | |
559 | * enabling a CRTC. The atomic helpers already take care of that in | |
560 | * drm_atomic_helper_update_legacy_modeset_state(). | |
561 | * | |
562 | * Returns: | |
563 | * | |
564 | * Returns true on success, and false on failure, i.e. when no accurate | |
565 | * timestamp could be acquired. | |
566 | */ | |
567 | bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, | |
568 | unsigned int pipe, | |
569 | int *max_error, | |
570 | struct timeval *vblank_time, | |
571 | bool in_vblank_irq) | |
572 | { | |
573 | struct timeval tv_etime; | |
574 | ktime_t stime, etime; | |
575 | bool vbl_status; | |
576 | struct drm_crtc *crtc; | |
577 | const struct drm_display_mode *mode; | |
578 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
579 | int vpos, hpos, i; | |
580 | int delta_ns, duration_ns; | |
581 | ||
582 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
583 | return false; | |
584 | ||
585 | crtc = drm_crtc_from_index(dev, pipe); | |
586 | ||
587 | if (pipe >= dev->num_crtcs || !crtc) { | |
588 | DRM_ERROR("Invalid crtc %u\n", pipe); | |
589 | return false; | |
590 | } | |
591 | ||
592 | /* Scanout position query not supported? Should not happen. */ | |
593 | if (!dev->driver->get_scanout_position) { | |
594 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
595 | return false; | |
596 | } | |
597 | ||
598 | if (drm_drv_uses_atomic_modeset(dev)) | |
599 | mode = &vblank->hwmode; | |
600 | else | |
601 | mode = &crtc->hwmode; | |
602 | ||
603 | /* If mode timing undefined, just return as no-op: | |
604 | * Happens during initial modesetting of a crtc. | |
605 | */ | |
606 | if (mode->crtc_clock == 0) { | |
607 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); | |
608 | WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev)); | |
609 | ||
610 | return false; | |
611 | } | |
612 | ||
613 | /* Get current scanout position with system timestamp. | |
614 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
615 | * if single query takes longer than max_error nanoseconds. | |
616 | * | |
617 | * This guarantees a tight bound on maximum error if | |
618 | * code gets preempted or delayed for some reason. | |
619 | */ | |
620 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
621 | /* | |
622 | * Get vertical and horizontal scanout position vpos, hpos, | |
623 | * and bounding timestamps stime, etime, pre/post query. | |
624 | */ | |
625 | vbl_status = dev->driver->get_scanout_position(dev, pipe, | |
626 | in_vblank_irq, | |
627 | &vpos, &hpos, | |
628 | &stime, &etime, | |
629 | mode); | |
630 | ||
631 | /* Return as no-op if scanout query unsupported or failed. */ | |
632 | if (!vbl_status) { | |
633 | DRM_DEBUG("crtc %u : scanoutpos query failed.\n", | |
634 | pipe); | |
635 | return false; | |
636 | } | |
637 | ||
638 | /* Compute uncertainty in timestamp of scanout position query. */ | |
639 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); | |
640 | ||
641 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
642 | if (duration_ns <= *max_error) | |
643 | break; | |
644 | } | |
645 | ||
646 | /* Noisy system timing? */ | |
647 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
648 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", | |
649 | pipe, duration_ns/1000, *max_error/1000, i); | |
650 | } | |
651 | ||
652 | /* Return upper bound of timestamp precision error. */ | |
653 | *max_error = duration_ns; | |
654 | ||
655 | /* Convert scanout position into elapsed time at raw_time query | |
656 | * since start of scanout at first display scanline. delta_ns | |
657 | * can be negative if start of scanout hasn't happened yet. | |
658 | */ | |
659 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), | |
660 | mode->crtc_clock); | |
661 | ||
662 | if (!drm_timestamp_monotonic) | |
663 | etime = ktime_mono_to_real(etime); | |
664 | ||
665 | /* save this only for debugging purposes */ | |
666 | tv_etime = ktime_to_timeval(etime); | |
667 | /* Subtract time delta from raw timestamp to get final | |
668 | * vblank_time timestamp for end of vblank. | |
669 | */ | |
670 | etime = ktime_sub_ns(etime, delta_ns); | |
671 | *vblank_time = ktime_to_timeval(etime); | |
672 | ||
673 | DRM_DEBUG_VBL("crtc %u : v p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", | |
674 | pipe, hpos, vpos, | |
675 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, | |
676 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, | |
677 | duration_ns/1000, i); | |
678 | ||
679 | return true; | |
680 | } | |
681 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
682 | ||
683 | static struct timeval get_drm_timestamp(void) | |
684 | { | |
685 | ktime_t now; | |
686 | ||
687 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); | |
688 | return ktime_to_timeval(now); | |
689 | } | |
690 | ||
691 | /** | |
692 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
693 | * vblank interval | |
694 | * @dev: DRM device | |
695 | * @pipe: index of CRTC whose vblank timestamp to retrieve | |
696 | * @tvblank: Pointer to target struct timeval which should receive the timestamp | |
697 | * @in_vblank_irq: | |
698 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
699 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
700 | * if flag is set. | |
701 | * | |
702 | * Fetches the system timestamp corresponding to the time of the most recent | |
703 | * vblank interval on specified CRTC. May call into kms-driver to | |
704 | * compute the timestamp with a high-precision GPU specific method. | |
705 | * | |
706 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
707 | * call, i.e., it isn't very precisely locked to the true vblank. | |
708 | * | |
709 | * Returns: | |
710 | * True if timestamp is considered to be very precise, false otherwise. | |
711 | */ | |
712 | static bool | |
713 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
714 | struct timeval *tvblank, bool in_vblank_irq) | |
715 | { | |
716 | bool ret = false; | |
717 | ||
718 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
719 | int max_error = (int) drm_timestamp_precision * 1000; | |
720 | ||
721 | /* Query driver if possible and precision timestamping enabled. */ | |
722 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) | |
723 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, | |
724 | tvblank, in_vblank_irq); | |
725 | ||
726 | /* GPU high precision timestamp query unsupported or failed. | |
727 | * Return current monotonic/gettimeofday timestamp as best estimate. | |
728 | */ | |
729 | if (!ret) | |
730 | *tvblank = get_drm_timestamp(); | |
731 | ||
732 | return ret; | |
733 | } | |
734 | ||
735 | /** | |
736 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
737 | * @crtc: which counter to retrieve | |
738 | * | |
739 | * Fetches the "cooked" vblank count value that represents the number of | |
740 | * vblank events since the system was booted, including lost events due to | |
741 | * modesetting activity. | |
742 | * | |
743 | * Returns: | |
744 | * The software vblank counter. | |
745 | */ | |
746 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) | |
747 | { | |
748 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
749 | } | |
750 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
751 | ||
752 | /** | |
753 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the | |
754 | * system timestamp corresponding to that vblank counter value. | |
755 | * @dev: DRM device | |
756 | * @pipe: index of CRTC whose counter to retrieve | |
757 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
758 | * | |
759 | * Fetches the "cooked" vblank count value that represents the number of | |
760 | * vblank events since the system was booted, including lost events due to | |
761 | * modesetting activity. Returns corresponding system timestamp of the time | |
762 | * of the vblank interval that corresponds to the current vblank counter value. | |
763 | * | |
764 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
765 | */ | |
766 | static u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, | |
767 | struct timeval *vblanktime) | |
768 | { | |
769 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
770 | u32 vblank_count; | |
771 | unsigned int seq; | |
772 | ||
773 | if (WARN_ON(pipe >= dev->num_crtcs)) { | |
774 | *vblanktime = (struct timeval) { 0 }; | |
775 | return 0; | |
776 | } | |
777 | ||
778 | do { | |
779 | seq = read_seqbegin(&vblank->seqlock); | |
780 | vblank_count = vblank->count; | |
781 | *vblanktime = vblank->time; | |
782 | } while (read_seqretry(&vblank->seqlock, seq)); | |
783 | ||
784 | return vblank_count; | |
785 | } | |
786 | ||
787 | /** | |
788 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
789 | * and the system timestamp corresponding to that vblank counter value | |
790 | * @crtc: which counter to retrieve | |
791 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
792 | * | |
793 | * Fetches the "cooked" vblank count value that represents the number of | |
794 | * vblank events since the system was booted, including lost events due to | |
795 | * modesetting activity. Returns corresponding system timestamp of the time | |
796 | * of the vblank interval that corresponds to the current vblank counter value. | |
797 | */ | |
798 | u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, | |
799 | struct timeval *vblanktime) | |
800 | { | |
801 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
802 | vblanktime); | |
803 | } | |
804 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
805 | ||
806 | static void send_vblank_event(struct drm_device *dev, | |
807 | struct drm_pending_vblank_event *e, | |
808 | unsigned long seq, struct timeval *now) | |
809 | { | |
810 | e->event.sequence = seq; | |
811 | e->event.tv_sec = now->tv_sec; | |
812 | e->event.tv_usec = now->tv_usec; | |
813 | ||
814 | trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, | |
815 | e->event.sequence); | |
816 | ||
817 | drm_send_event_locked(dev, &e->base); | |
818 | } | |
819 | ||
820 | /** | |
821 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip | |
822 | * @crtc: the source CRTC of the vblank event | |
823 | * @e: the event to send | |
824 | * | |
825 | * A lot of drivers need to generate vblank events for the very next vblank | |
826 | * interrupt. For example when the page flip interrupt happens when the page | |
827 | * flip gets armed, but not when it actually executes within the next vblank | |
828 | * period. This helper function implements exactly the required vblank arming | |
829 | * behaviour. | |
830 | * | |
831 | * NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an | |
832 | * atomic commit must ensure that the next vblank happens at exactly the same | |
833 | * time as the atomic commit is committed to the hardware. This function itself | |
834 | * does **not** protect again the next vblank interrupt racing with either this | |
835 | * function call or the atomic commit operation. A possible sequence could be: | |
836 | * | |
837 | * 1. Driver commits new hardware state into vblank-synchronized registers. | |
838 | * 2. A vblank happens, committing the hardware state. Also the corresponding | |
839 | * vblank interrupt is fired off and fully processed by the interrupt | |
840 | * handler. | |
841 | * 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event(). | |
842 | * 4. The event is only send out for the next vblank, which is wrong. | |
843 | * | |
844 | * An equivalent race can happen when the driver calls | |
845 | * drm_crtc_arm_vblank_event() before writing out the new hardware state. | |
846 | * | |
847 | * The only way to make this work safely is to prevent the vblank from firing | |
848 | * (and the hardware from committing anything else) until the entire atomic | |
849 | * commit sequence has run to completion. If the hardware does not have such a | |
850 | * feature (e.g. using a "go" bit), then it is unsafe to use this functions. | |
851 | * Instead drivers need to manually send out the event from their interrupt | |
852 | * handler by calling drm_crtc_send_vblank_event() and make sure that there's no | |
853 | * possible race with the hardware committing the atomic update. | |
854 | * | |
855 | * Caller must hold event lock. Caller must also hold a vblank reference for | |
856 | * the event @e, which will be dropped when the next vblank arrives. | |
857 | */ | |
858 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, | |
859 | struct drm_pending_vblank_event *e) | |
860 | { | |
861 | struct drm_device *dev = crtc->dev; | |
862 | unsigned int pipe = drm_crtc_index(crtc); | |
863 | ||
864 | assert_spin_locked(&dev->event_lock); | |
865 | ||
866 | e->pipe = pipe; | |
867 | e->event.sequence = drm_vblank_count(dev, pipe); | |
868 | e->event.crtc_id = crtc->base.id; | |
869 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
870 | } | |
871 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); | |
872 | ||
873 | /** | |
874 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
875 | * @crtc: the source CRTC of the vblank event | |
876 | * @e: the event to send | |
877 | * | |
878 | * Updates sequence # and timestamp on event for the most recently processed | |
879 | * vblank, and sends it to userspace. Caller must hold event lock. | |
880 | * | |
881 | * See drm_crtc_arm_vblank_event() for a helper which can be used in certain | |
882 | * situation, especially to send out events for atomic commit operations. | |
883 | */ | |
884 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
885 | struct drm_pending_vblank_event *e) | |
886 | { | |
887 | struct drm_device *dev = crtc->dev; | |
888 | unsigned int seq, pipe = drm_crtc_index(crtc); | |
889 | struct timeval now; | |
890 | ||
891 | if (dev->num_crtcs > 0) { | |
892 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
893 | } else { | |
894 | seq = 0; | |
895 | ||
896 | now = get_drm_timestamp(); | |
897 | } | |
898 | e->pipe = pipe; | |
899 | e->event.crtc_id = crtc->base.id; | |
900 | send_vblank_event(dev, e, seq, &now); | |
901 | } | |
902 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
903 | ||
904 | static int __enable_vblank(struct drm_device *dev, unsigned int pipe) | |
905 | { | |
906 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
907 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
908 | ||
909 | if (crtc->funcs->enable_vblank) | |
910 | return crtc->funcs->enable_vblank(crtc); | |
911 | } | |
912 | ||
913 | return dev->driver->enable_vblank(dev, pipe); | |
914 | } | |
915 | ||
916 | /** | |
917 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
918 | * @dev: DRM device | |
919 | * @pipe: CRTC index | |
920 | * | |
921 | * Returns: | |
922 | * Zero on success or a negative error code on failure. | |
923 | */ | |
924 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) | |
925 | { | |
926 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
927 | int ret = 0; | |
928 | ||
929 | assert_spin_locked(&dev->vbl_lock); | |
930 | ||
931 | spin_lock(&dev->vblank_time_lock); | |
932 | ||
933 | if (!vblank->enabled) { | |
934 | /* | |
935 | * Enable vblank irqs under vblank_time_lock protection. | |
936 | * All vblank count & timestamp updates are held off | |
937 | * until we are done reinitializing master counter and | |
938 | * timestamps. Filtercode in drm_handle_vblank() will | |
939 | * prevent double-accounting of same vblank interval. | |
940 | */ | |
941 | ret = __enable_vblank(dev, pipe); | |
942 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); | |
943 | if (ret) { | |
944 | atomic_dec(&vblank->refcount); | |
945 | } else { | |
946 | drm_update_vblank_count(dev, pipe, 0); | |
947 | /* drm_update_vblank_count() includes a wmb so we just | |
948 | * need to ensure that the compiler emits the write | |
949 | * to mark the vblank as enabled after the call | |
950 | * to drm_update_vblank_count(). | |
951 | */ | |
952 | WRITE_ONCE(vblank->enabled, true); | |
953 | } | |
954 | } | |
955 | ||
956 | spin_unlock(&dev->vblank_time_lock); | |
957 | ||
958 | return ret; | |
959 | } | |
960 | ||
961 | /** | |
962 | * drm_vblank_get - get a reference count on vblank events | |
963 | * @dev: DRM device | |
964 | * @pipe: index of CRTC to own | |
965 | * | |
966 | * Acquire a reference count on vblank events to avoid having them disabled | |
967 | * while in use. | |
968 | * | |
969 | * This is the legacy version of drm_crtc_vblank_get(). | |
970 | * | |
971 | * Returns: | |
972 | * Zero on success or a negative error code on failure. | |
973 | */ | |
974 | static int drm_vblank_get(struct drm_device *dev, unsigned int pipe) | |
975 | { | |
976 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
977 | unsigned long irqflags; | |
978 | int ret = 0; | |
979 | ||
980 | if (!dev->num_crtcs) | |
981 | return -EINVAL; | |
982 | ||
983 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
984 | return -EINVAL; | |
985 | ||
986 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
987 | /* Going from 0->1 means we have to enable interrupts again */ | |
988 | if (atomic_add_return(1, &vblank->refcount) == 1) { | |
989 | ret = drm_vblank_enable(dev, pipe); | |
990 | } else { | |
991 | if (!vblank->enabled) { | |
992 | atomic_dec(&vblank->refcount); | |
993 | ret = -EINVAL; | |
994 | } | |
995 | } | |
996 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
997 | ||
998 | return ret; | |
999 | } | |
1000 | ||
1001 | /** | |
1002 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1003 | * @crtc: which CRTC to own | |
1004 | * | |
1005 | * Acquire a reference count on vblank events to avoid having them disabled | |
1006 | * while in use. | |
1007 | * | |
1008 | * Returns: | |
1009 | * Zero on success or a negative error code on failure. | |
1010 | */ | |
1011 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1012 | { | |
1013 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1014 | } | |
1015 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1016 | ||
1017 | /** | |
1018 | * drm_vblank_put - release ownership of vblank events | |
1019 | * @dev: DRM device | |
1020 | * @pipe: index of CRTC to release | |
1021 | * | |
1022 | * Release ownership of a given vblank counter, turning off interrupts | |
1023 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1024 | * | |
1025 | * This is the legacy version of drm_crtc_vblank_put(). | |
1026 | */ | |
1027 | static void drm_vblank_put(struct drm_device *dev, unsigned int pipe) | |
1028 | { | |
1029 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1030 | ||
1031 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1032 | return; | |
1033 | ||
1034 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) | |
1035 | return; | |
1036 | ||
1037 | /* Last user schedules interrupt disable */ | |
1038 | if (atomic_dec_and_test(&vblank->refcount)) { | |
1039 | if (drm_vblank_offdelay == 0) | |
1040 | return; | |
1041 | else if (drm_vblank_offdelay < 0) | |
1042 | vblank_disable_fn((unsigned long)vblank); | |
1043 | else if (!dev->vblank_disable_immediate) | |
1044 | mod_timer(&vblank->disable_timer, | |
1045 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1046 | } | |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1051 | * @crtc: which counter to give up | |
1052 | * | |
1053 | * Release ownership of a given vblank counter, turning off interrupts | |
1054 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1055 | */ | |
1056 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1057 | { | |
1058 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1059 | } | |
1060 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1061 | ||
1062 | /** | |
1063 | * drm_wait_one_vblank - wait for one vblank | |
1064 | * @dev: DRM device | |
1065 | * @pipe: CRTC index | |
1066 | * | |
1067 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. | |
1068 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
1069 | * due to lack of driver support or because the crtc is off. | |
1070 | */ | |
1071 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) | |
1072 | { | |
1073 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1074 | int ret; | |
1075 | u32 last; | |
1076 | ||
1077 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1078 | return; | |
1079 | ||
1080 | ret = drm_vblank_get(dev, pipe); | |
1081 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |
1082 | return; | |
1083 | ||
1084 | last = drm_vblank_count(dev, pipe); | |
1085 | ||
1086 | ret = wait_event_timeout(vblank->queue, | |
1087 | last != drm_vblank_count(dev, pipe), | |
1088 | msecs_to_jiffies(100)); | |
1089 | ||
1090 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); | |
1091 | ||
1092 | drm_vblank_put(dev, pipe); | |
1093 | } | |
1094 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1095 | ||
1096 | /** | |
1097 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1098 | * @crtc: DRM crtc | |
1099 | * | |
1100 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1101 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1102 | * due to lack of driver support or because the crtc is off. | |
1103 | */ | |
1104 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1105 | { | |
1106 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1107 | } | |
1108 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1109 | ||
1110 | /** | |
1111 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1112 | * @crtc: CRTC in question | |
1113 | * | |
1114 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1115 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1116 | * stored so that drm_vblank_on can restore it again. | |
1117 | * | |
1118 | * Drivers must use this function when the hardware vblank counter can get | |
1119 | * reset, e.g. when suspending. | |
1120 | */ | |
1121 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1122 | { | |
1123 | struct drm_device *dev = crtc->dev; | |
1124 | unsigned int pipe = drm_crtc_index(crtc); | |
1125 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1126 | struct drm_pending_vblank_event *e, *t; | |
1127 | struct timeval now; | |
1128 | unsigned long irqflags; | |
1129 | unsigned int seq; | |
1130 | ||
1131 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1132 | return; | |
1133 | ||
1134 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1135 | ||
1136 | spin_lock(&dev->vbl_lock); | |
1137 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", | |
1138 | pipe, vblank->enabled, vblank->inmodeset); | |
1139 | ||
1140 | /* Avoid redundant vblank disables without previous | |
1141 | * drm_crtc_vblank_on(). */ | |
1142 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) | |
1143 | drm_vblank_disable_and_save(dev, pipe); | |
1144 | ||
1145 | wake_up(&vblank->queue); | |
1146 | ||
1147 | /* | |
1148 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1149 | * the vblank interrupt by bumping the refcount. | |
1150 | */ | |
1151 | if (!vblank->inmodeset) { | |
1152 | atomic_inc(&vblank->refcount); | |
1153 | vblank->inmodeset = 1; | |
1154 | } | |
1155 | spin_unlock(&dev->vbl_lock); | |
1156 | ||
1157 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
1158 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1159 | ||
1160 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1161 | if (e->pipe != pipe) | |
1162 | continue; | |
1163 | DRM_DEBUG("Sending premature vblank event on disable: " | |
1164 | "wanted %u, current %u\n", | |
1165 | e->event.sequence, seq); | |
1166 | list_del(&e->base.link); | |
1167 | drm_vblank_put(dev, pipe); | |
1168 | send_vblank_event(dev, e, seq, &now); | |
1169 | } | |
1170 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1171 | ||
1172 | /* Will be reset by the modeset helpers when re-enabling the crtc by | |
1173 | * calling drm_calc_timestamping_constants(). */ | |
1174 | vblank->hwmode.crtc_clock = 0; | |
1175 | } | |
1176 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1177 | ||
1178 | /** | |
1179 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
1180 | * @crtc: CRTC in question | |
1181 | * | |
1182 | * Drivers can use this function to reset the vblank state to off at load time. | |
1183 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1184 | * drm_crtc_vblank_on() functions. The difference compared to | |
1185 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1186 | * and hence doesn't need to call any driver hooks. | |
1187 | */ | |
1188 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) | |
1189 | { | |
1190 | struct drm_device *dev = crtc->dev; | |
1191 | unsigned long irqflags; | |
1192 | unsigned int pipe = drm_crtc_index(crtc); | |
1193 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1194 | ||
1195 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1196 | /* | |
1197 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1198 | * interrupt by bumping the refcount. | |
1199 | */ | |
1200 | if (!vblank->inmodeset) { | |
1201 | atomic_inc(&vblank->refcount); | |
1202 | vblank->inmodeset = 1; | |
1203 | } | |
1204 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1205 | ||
1206 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1207 | } | |
1208 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1209 | ||
1210 | /** | |
1211 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1212 | * @crtc: CRTC in question | |
1213 | * | |
1214 | * This functions restores the vblank interrupt state captured with | |
1215 | * drm_crtc_vblank_off() again. Note that calls to drm_crtc_vblank_on() and | |
1216 | * drm_crtc_vblank_off() can be unbalanced and so can also be unconditionally called | |
1217 | * in driver load code to reflect the current hardware state of the crtc. | |
1218 | */ | |
1219 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1220 | { | |
1221 | struct drm_device *dev = crtc->dev; | |
1222 | unsigned int pipe = drm_crtc_index(crtc); | |
1223 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1224 | unsigned long irqflags; | |
1225 | ||
1226 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1227 | return; | |
1228 | ||
1229 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1230 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", | |
1231 | pipe, vblank->enabled, vblank->inmodeset); | |
1232 | ||
1233 | /* Drop our private "prevent drm_vblank_get" refcount */ | |
1234 | if (vblank->inmodeset) { | |
1235 | atomic_dec(&vblank->refcount); | |
1236 | vblank->inmodeset = 0; | |
1237 | } | |
1238 | ||
1239 | drm_reset_vblank_timestamp(dev, pipe); | |
1240 | ||
1241 | /* | |
1242 | * re-enable interrupts if there are users left, or the | |
1243 | * user wishes vblank interrupts to be enabled all the time. | |
1244 | */ | |
1245 | if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) | |
1246 | WARN_ON(drm_vblank_enable(dev, pipe)); | |
1247 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1248 | } | |
1249 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1250 | ||
1251 | static void drm_legacy_vblank_pre_modeset(struct drm_device *dev, | |
1252 | unsigned int pipe) | |
1253 | { | |
1254 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1255 | ||
1256 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
1257 | if (!dev->num_crtcs) | |
1258 | return; | |
1259 | ||
1260 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1261 | return; | |
1262 | ||
1263 | /* | |
1264 | * To avoid all the problems that might happen if interrupts | |
1265 | * were enabled/disabled around or between these calls, we just | |
1266 | * have the kernel take a reference on the CRTC (just once though | |
1267 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1268 | * so that interrupts remain enabled in the interim. | |
1269 | */ | |
1270 | if (!vblank->inmodeset) { | |
1271 | vblank->inmodeset = 0x1; | |
1272 | if (drm_vblank_get(dev, pipe) == 0) | |
1273 | vblank->inmodeset |= 0x2; | |
1274 | } | |
1275 | } | |
1276 | ||
1277 | static void drm_legacy_vblank_post_modeset(struct drm_device *dev, | |
1278 | unsigned int pipe) | |
1279 | { | |
1280 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1281 | unsigned long irqflags; | |
1282 | ||
1283 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
1284 | if (!dev->num_crtcs) | |
1285 | return; | |
1286 | ||
1287 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1288 | return; | |
1289 | ||
1290 | if (vblank->inmodeset) { | |
1291 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1292 | drm_reset_vblank_timestamp(dev, pipe); | |
1293 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1294 | ||
1295 | if (vblank->inmodeset & 0x2) | |
1296 | drm_vblank_put(dev, pipe); | |
1297 | ||
1298 | vblank->inmodeset = 0; | |
1299 | } | |
1300 | } | |
1301 | ||
1302 | int drm_legacy_modeset_ctl(struct drm_device *dev, void *data, | |
1303 | struct drm_file *file_priv) | |
1304 | { | |
1305 | struct drm_modeset_ctl *modeset = data; | |
1306 | unsigned int pipe; | |
1307 | ||
1308 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1309 | if (!dev->num_crtcs) | |
1310 | return 0; | |
1311 | ||
1312 | /* KMS drivers handle this internally */ | |
1313 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) | |
1314 | return 0; | |
1315 | ||
1316 | pipe = modeset->crtc; | |
1317 | if (pipe >= dev->num_crtcs) | |
1318 | return -EINVAL; | |
1319 | ||
1320 | switch (modeset->cmd) { | |
1321 | case _DRM_PRE_MODESET: | |
1322 | drm_legacy_vblank_pre_modeset(dev, pipe); | |
1323 | break; | |
1324 | case _DRM_POST_MODESET: | |
1325 | drm_legacy_vblank_post_modeset(dev, pipe); | |
1326 | break; | |
1327 | default: | |
1328 | return -EINVAL; | |
1329 | } | |
1330 | ||
1331 | return 0; | |
1332 | } | |
1333 | ||
1334 | static inline bool vblank_passed(u32 seq, u32 ref) | |
1335 | { | |
1336 | return (seq - ref) <= (1 << 23); | |
1337 | } | |
1338 | ||
1339 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, | |
1340 | union drm_wait_vblank *vblwait, | |
1341 | struct drm_file *file_priv) | |
1342 | { | |
1343 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1344 | struct drm_pending_vblank_event *e; | |
1345 | struct timeval now; | |
1346 | unsigned long flags; | |
1347 | unsigned int seq; | |
1348 | int ret; | |
1349 | ||
1350 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
1351 | if (e == NULL) { | |
1352 | ret = -ENOMEM; | |
1353 | goto err_put; | |
1354 | } | |
1355 | ||
1356 | e->pipe = pipe; | |
1357 | e->event.base.type = DRM_EVENT_VBLANK; | |
1358 | e->event.base.length = sizeof(e->event); | |
1359 | e->event.user_data = vblwait->request.signal; | |
1360 | ||
1361 | spin_lock_irqsave(&dev->event_lock, flags); | |
1362 | ||
1363 | /* | |
1364 | * drm_crtc_vblank_off() might have been called after we called | |
1365 | * drm_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |
1366 | * vblank disable, so no need for further locking. The reference from | |
1367 | * drm_vblank_get() protects against vblank disable from another source. | |
1368 | */ | |
1369 | if (!READ_ONCE(vblank->enabled)) { | |
1370 | ret = -EINVAL; | |
1371 | goto err_unlock; | |
1372 | } | |
1373 | ||
1374 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |
1375 | &e->event.base); | |
1376 | ||
1377 | if (ret) | |
1378 | goto err_unlock; | |
1379 | ||
1380 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1381 | ||
1382 | DRM_DEBUG("event on vblank count %u, current %u, crtc %u\n", | |
1383 | vblwait->request.sequence, seq, pipe); | |
1384 | ||
1385 | trace_drm_vblank_event_queued(file_priv, pipe, | |
1386 | vblwait->request.sequence); | |
1387 | ||
1388 | e->event.sequence = vblwait->request.sequence; | |
1389 | if (vblank_passed(seq, vblwait->request.sequence)) { | |
1390 | drm_vblank_put(dev, pipe); | |
1391 | send_vblank_event(dev, e, seq, &now); | |
1392 | vblwait->reply.sequence = seq; | |
1393 | } else { | |
1394 | /* drm_handle_vblank_events will call drm_vblank_put */ | |
1395 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
1396 | vblwait->reply.sequence = vblwait->request.sequence; | |
1397 | } | |
1398 | ||
1399 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1400 | ||
1401 | return 0; | |
1402 | ||
1403 | err_unlock: | |
1404 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1405 | kfree(e); | |
1406 | err_put: | |
1407 | drm_vblank_put(dev, pipe); | |
1408 | return ret; | |
1409 | } | |
1410 | ||
1411 | static bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait) | |
1412 | { | |
1413 | if (vblwait->request.sequence) | |
1414 | return false; | |
1415 | ||
1416 | return _DRM_VBLANK_RELATIVE == | |
1417 | (vblwait->request.type & (_DRM_VBLANK_TYPES_MASK | | |
1418 | _DRM_VBLANK_EVENT | | |
1419 | _DRM_VBLANK_NEXTONMISS)); | |
1420 | } | |
1421 | ||
1422 | /* | |
1423 | * Wait for VBLANK. | |
1424 | * | |
1425 | * \param inode device inode. | |
1426 | * \param file_priv DRM file private. | |
1427 | * \param cmd command. | |
1428 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1429 | * \return zero on success or a negative number on failure. | |
1430 | * | |
1431 | * This function enables the vblank interrupt on the pipe requested, then | |
1432 | * sleeps waiting for the requested sequence number to occur, and drops | |
1433 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that | |
1434 | * after a timeout with no further vblank waits scheduled). | |
1435 | */ | |
1436 | int drm_wait_vblank(struct drm_device *dev, void *data, | |
1437 | struct drm_file *file_priv) | |
1438 | { | |
1439 | struct drm_vblank_crtc *vblank; | |
1440 | union drm_wait_vblank *vblwait = data; | |
1441 | int ret; | |
1442 | unsigned int flags, seq, pipe, high_pipe; | |
1443 | ||
1444 | if (!dev->irq_enabled) | |
1445 | return -EINVAL; | |
1446 | ||
1447 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) | |
1448 | return -EINVAL; | |
1449 | ||
1450 | if (vblwait->request.type & | |
1451 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1452 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
1453 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", | |
1454 | vblwait->request.type, | |
1455 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1456 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
1457 | return -EINVAL; | |
1458 | } | |
1459 | ||
1460 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; | |
1461 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); | |
1462 | if (high_pipe) | |
1463 | pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1464 | else | |
1465 | pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
1466 | if (pipe >= dev->num_crtcs) | |
1467 | return -EINVAL; | |
1468 | ||
1469 | vblank = &dev->vblank[pipe]; | |
1470 | ||
1471 | /* If the counter is currently enabled and accurate, short-circuit | |
1472 | * queries to return the cached timestamp of the last vblank. | |
1473 | */ | |
1474 | if (dev->vblank_disable_immediate && | |
1475 | drm_wait_vblank_is_query(vblwait) && | |
1476 | READ_ONCE(vblank->enabled)) { | |
1477 | struct timeval now; | |
1478 | ||
1479 | vblwait->reply.sequence = | |
1480 | drm_vblank_count_and_time(dev, pipe, &now); | |
1481 | vblwait->reply.tval_sec = now.tv_sec; | |
1482 | vblwait->reply.tval_usec = now.tv_usec; | |
1483 | return 0; | |
1484 | } | |
1485 | ||
1486 | ret = drm_vblank_get(dev, pipe); | |
1487 | if (ret) { | |
1488 | DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret); | |
1489 | return ret; | |
1490 | } | |
1491 | seq = drm_vblank_count(dev, pipe); | |
1492 | ||
1493 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { | |
1494 | case _DRM_VBLANK_RELATIVE: | |
1495 | vblwait->request.sequence += seq; | |
1496 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1497 | case _DRM_VBLANK_ABSOLUTE: | |
1498 | break; | |
1499 | default: | |
1500 | ret = -EINVAL; | |
1501 | goto done; | |
1502 | } | |
1503 | ||
1504 | if ((flags & _DRM_VBLANK_NEXTONMISS) && | |
1505 | vblank_passed(seq, vblwait->request.sequence)) | |
1506 | vblwait->request.sequence = seq + 1; | |
1507 | ||
1508 | if (flags & _DRM_VBLANK_EVENT) { | |
1509 | /* must hold on to the vblank ref until the event fires | |
1510 | * drm_vblank_put will be called asynchronously | |
1511 | */ | |
1512 | return drm_queue_vblank_event(dev, pipe, vblwait, file_priv); | |
1513 | } | |
1514 | ||
1515 | if (vblwait->request.sequence != seq) { | |
1516 | DRM_DEBUG("waiting on vblank count %u, crtc %u\n", | |
1517 | vblwait->request.sequence, pipe); | |
1518 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
1519 | vblank_passed(drm_vblank_count(dev, pipe), | |
1520 | vblwait->request.sequence) || | |
1521 | !READ_ONCE(vblank->enabled)); | |
1522 | } | |
1523 | ||
1524 | if (ret != -EINTR) { | |
1525 | struct timeval now; | |
1526 | ||
1527 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, pipe, &now); | |
1528 | vblwait->reply.tval_sec = now.tv_sec; | |
1529 | vblwait->reply.tval_usec = now.tv_usec; | |
1530 | ||
1531 | DRM_DEBUG("crtc %d returning %u to client\n", | |
1532 | pipe, vblwait->reply.sequence); | |
1533 | } else { | |
1534 | DRM_DEBUG("crtc %d vblank wait interrupted by signal\n", pipe); | |
1535 | } | |
1536 | ||
1537 | done: | |
1538 | drm_vblank_put(dev, pipe); | |
1539 | return ret; | |
1540 | } | |
1541 | ||
1542 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) | |
1543 | { | |
1544 | struct drm_pending_vblank_event *e, *t; | |
1545 | struct timeval now; | |
1546 | unsigned int seq; | |
1547 | ||
1548 | assert_spin_locked(&dev->event_lock); | |
1549 | ||
1550 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1551 | ||
1552 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1553 | if (e->pipe != pipe) | |
1554 | continue; | |
1555 | if (!vblank_passed(seq, e->event.sequence)) | |
1556 | continue; | |
1557 | ||
1558 | DRM_DEBUG("vblank event on %u, current %u\n", | |
1559 | e->event.sequence, seq); | |
1560 | ||
1561 | list_del(&e->base.link); | |
1562 | drm_vblank_put(dev, pipe); | |
1563 | send_vblank_event(dev, e, seq, &now); | |
1564 | } | |
1565 | ||
1566 | trace_drm_vblank_event(pipe, seq); | |
1567 | } | |
1568 | ||
1569 | /** | |
1570 | * drm_handle_vblank - handle a vblank event | |
1571 | * @dev: DRM device | |
1572 | * @pipe: index of CRTC where this event occurred | |
1573 | * | |
1574 | * Drivers should call this routine in their vblank interrupt handlers to | |
1575 | * update the vblank counter and send any signals that may be pending. | |
1576 | * | |
1577 | * This is the legacy version of drm_crtc_handle_vblank(). | |
1578 | */ | |
1579 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) | |
1580 | { | |
1581 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1582 | unsigned long irqflags; | |
1583 | bool disable_irq; | |
1584 | ||
1585 | if (WARN_ON_ONCE(!dev->num_crtcs)) | |
1586 | return false; | |
1587 | ||
1588 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1589 | return false; | |
1590 | ||
1591 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1592 | ||
1593 | /* Need timestamp lock to prevent concurrent execution with | |
1594 | * vblank enable/disable, as this would cause inconsistent | |
1595 | * or corrupted timestamps and vblank counts. | |
1596 | */ | |
1597 | spin_lock(&dev->vblank_time_lock); | |
1598 | ||
1599 | /* Vblank irq handling disabled. Nothing to do. */ | |
1600 | if (!vblank->enabled) { | |
1601 | spin_unlock(&dev->vblank_time_lock); | |
1602 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1603 | return false; | |
1604 | } | |
1605 | ||
1606 | drm_update_vblank_count(dev, pipe, true); | |
1607 | ||
1608 | spin_unlock(&dev->vblank_time_lock); | |
1609 | ||
1610 | wake_up(&vblank->queue); | |
1611 | ||
1612 | /* With instant-off, we defer disabling the interrupt until after | |
1613 | * we finish processing the following vblank after all events have | |
1614 | * been signaled. The disable has to be last (after | |
1615 | * drm_handle_vblank_events) so that the timestamp is always accurate. | |
1616 | */ | |
1617 | disable_irq = (dev->vblank_disable_immediate && | |
1618 | drm_vblank_offdelay > 0 && | |
1619 | !atomic_read(&vblank->refcount)); | |
1620 | ||
1621 | drm_handle_vblank_events(dev, pipe); | |
1622 | ||
1623 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1624 | ||
1625 | if (disable_irq) | |
1626 | vblank_disable_fn((unsigned long)vblank); | |
1627 | ||
1628 | return true; | |
1629 | } | |
1630 | EXPORT_SYMBOL(drm_handle_vblank); | |
1631 | ||
1632 | /** | |
1633 | * drm_crtc_handle_vblank - handle a vblank event | |
1634 | * @crtc: where this event occurred | |
1635 | * | |
1636 | * Drivers should call this routine in their vblank interrupt handlers to | |
1637 | * update the vblank counter and send any signals that may be pending. | |
1638 | * | |
1639 | * This is the native KMS version of drm_handle_vblank(). | |
1640 | * | |
1641 | * Returns: | |
1642 | * True if the event was successfully handled, false on failure. | |
1643 | */ | |
1644 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1645 | { | |
1646 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1647 | } | |
1648 | EXPORT_SYMBOL(drm_crtc_handle_vblank); |