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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 | ||
8 | /* | |
9 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com | |
10 | * | |
11 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
12 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
13 | * All Rights Reserved. | |
14 | * | |
15 | * Permission is hereby granted, free of charge, to any person obtaining a | |
16 | * copy of this software and associated documentation files (the "Software"), | |
17 | * to deal in the Software without restriction, including without limitation | |
18 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
19 | * and/or sell copies of the Software, and to permit persons to whom the | |
20 | * Software is furnished to do so, subject to the following conditions: | |
21 | * | |
22 | * The above copyright notice and this permission notice (including the next | |
23 | * paragraph) shall be included in all copies or substantial portions of the | |
24 | * Software. | |
25 | * | |
26 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
27 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
28 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
29 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
30 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
31 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
32 | * OTHER DEALINGS IN THE SOFTWARE. | |
33 | */ | |
34 | ||
35 | #include <drm/drmP.h> | |
36 | #include "drm_trace.h" | |
37 | #include "drm_internal.h" | |
38 | ||
39 | #include <linux/interrupt.h> /* For task queue support */ | |
40 | #include <linux/slab.h> | |
41 | ||
42 | #include <linux/vgaarb.h> | |
43 | #include <linux/export.h> | |
44 | ||
45 | /* Access macro for slots in vblank timestamp ringbuffer. */ | |
46 | #define vblanktimestamp(dev, pipe, count) \ | |
47 | ((dev)->vblank[pipe].time[(count) % DRM_VBLANKTIME_RBSIZE]) | |
48 | ||
49 | /* Retry timestamp calculation up to 3 times to satisfy | |
50 | * drm_timestamp_precision before giving up. | |
51 | */ | |
52 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
53 | ||
54 | /* Threshold in nanoseconds for detection of redundant | |
55 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
56 | */ | |
57 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
58 | ||
59 | static bool | |
60 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
61 | struct timeval *tvblank, unsigned flags); | |
62 | ||
63 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ | |
64 | ||
65 | /* | |
66 | * Default to use monotonic timestamps for wait-for-vblank and page-flip | |
67 | * complete events. | |
68 | */ | |
69 | unsigned int drm_timestamp_monotonic = 1; | |
70 | ||
71 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ | |
72 | ||
73 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
74 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
75 | module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600); | |
76 | ||
77 | static void store_vblank(struct drm_device *dev, unsigned int pipe, | |
78 | u32 vblank_count_inc, | |
79 | struct timeval *t_vblank, u32 last) | |
80 | { | |
81 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
82 | u32 tslot; | |
83 | ||
84 | assert_spin_locked(&dev->vblank_time_lock); | |
85 | ||
86 | vblank->last = last; | |
87 | ||
88 | /* All writers hold the spinlock, but readers are serialized by | |
89 | * the latching of vblank->count below. | |
90 | */ | |
91 | tslot = vblank->count + vblank_count_inc; | |
92 | vblanktimestamp(dev, pipe, tslot) = *t_vblank; | |
93 | ||
94 | /* | |
95 | * vblank timestamp updates are protected on the write side with | |
96 | * vblank_time_lock, but on the read side done locklessly using a | |
97 | * sequence-lock on the vblank counter. Ensure correct ordering using | |
98 | * memory barrriers. We need the barrier both before and also after the | |
99 | * counter update to synchronize with the next timestamp write. | |
100 | * The read-side barriers for this are in drm_vblank_count_and_time. | |
101 | */ | |
102 | smp_wmb(); | |
103 | vblank->count += vblank_count_inc; | |
104 | smp_wmb(); | |
105 | } | |
106 | ||
107 | /** | |
108 | * drm_reset_vblank_timestamp - reset the last timestamp to the last vblank | |
109 | * @dev: DRM device | |
110 | * @pipe: index of CRTC for which to reset the timestamp | |
111 | * | |
112 | * Reset the stored timestamp for the current vblank count to correspond | |
113 | * to the last vblank occurred. | |
114 | * | |
115 | * Only to be called from drm_vblank_on(). | |
116 | * | |
117 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
118 | * device vblank fields. | |
119 | */ | |
120 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) | |
121 | { | |
122 | u32 cur_vblank; | |
123 | bool rc; | |
124 | struct timeval t_vblank; | |
125 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
126 | ||
127 | spin_lock(&dev->vblank_time_lock); | |
128 | ||
129 | /* | |
130 | * sample the current counter to avoid random jumps | |
131 | * when drm_vblank_enable() applies the diff | |
132 | */ | |
133 | do { | |
134 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); | |
135 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0); | |
136 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0); | |
137 | ||
138 | /* | |
139 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
140 | * available and didn't fail. Otherwise reinitialize delayed at next vblank | |
141 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
142 | */ | |
143 | if (!rc) | |
144 | t_vblank = (struct timeval) {0, 0}; | |
145 | ||
146 | /* | |
147 | * +1 to make sure user will never see the same | |
148 | * vblank counter value before and after a modeset | |
149 | */ | |
150 | store_vblank(dev, pipe, 1, &t_vblank, cur_vblank); | |
151 | ||
152 | spin_unlock(&dev->vblank_time_lock); | |
153 | } | |
154 | ||
155 | /** | |
156 | * drm_update_vblank_count - update the master vblank counter | |
157 | * @dev: DRM device | |
158 | * @pipe: counter to update | |
159 | * | |
160 | * Call back into the driver to update the appropriate vblank counter | |
161 | * (specified by @pipe). Deal with wraparound, if it occurred, and | |
162 | * update the last read value so we can deal with wraparound on the next | |
163 | * call if necessary. | |
164 | * | |
165 | * Only necessary when going from off->on, to account for frames we | |
166 | * didn't get an interrupt for. | |
167 | * | |
168 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
169 | * device vblank fields. | |
170 | */ | |
171 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, | |
172 | unsigned long flags) | |
173 | { | |
174 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
175 | u32 cur_vblank, diff; | |
176 | bool rc; | |
177 | struct timeval t_vblank; | |
178 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
179 | int framedur_ns = vblank->framedur_ns; | |
180 | ||
181 | /* | |
182 | * Interrupts were disabled prior to this call, so deal with counter | |
183 | * wrap if needed. | |
184 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events | |
185 | * here if the register is small or we had vblank interrupts off for | |
186 | * a long time. | |
187 | * | |
188 | * We repeat the hardware vblank counter & timestamp query until | |
189 | * we get consistent results. This to prevent races between gpu | |
190 | * updating its hardware counter while we are retrieving the | |
191 | * corresponding vblank timestamp. | |
192 | */ | |
193 | do { | |
194 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); | |
195 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags); | |
196 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0); | |
197 | ||
198 | if (dev->max_vblank_count != 0) { | |
199 | /* trust the hw counter when it's around */ | |
200 | diff = (cur_vblank - vblank->last) & dev->max_vblank_count; | |
201 | } else if (rc && framedur_ns) { | |
202 | const struct timeval *t_old; | |
203 | u64 diff_ns; | |
204 | ||
205 | t_old = &vblanktimestamp(dev, pipe, vblank->count); | |
206 | diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old); | |
207 | ||
208 | /* | |
209 | * Figure out how many vblanks we've missed based | |
210 | * on the difference in the timestamps and the | |
211 | * frame/field duration. | |
212 | */ | |
213 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |
214 | ||
215 | if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ) | |
216 | DRM_DEBUG("crtc %u: Redundant vblirq ignored." | |
217 | " diff_ns = %lld, framedur_ns = %d)\n", | |
218 | pipe, (long long) diff_ns, framedur_ns); | |
219 | } else { | |
220 | /* some kind of default for drivers w/o accurate vbl timestamping */ | |
221 | diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0; | |
222 | } | |
223 | ||
224 | DRM_DEBUG("updating vblank count on crtc %u:" | |
225 | " current=%u, diff=%u, hw=%u hw_last=%u\n", | |
226 | pipe, vblank->count, diff, cur_vblank, vblank->last); | |
227 | ||
228 | if (diff == 0) { | |
229 | WARN_ON_ONCE(cur_vblank != vblank->last); | |
230 | return; | |
231 | } | |
232 | ||
233 | /* | |
234 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
235 | * available and didn't fail. Otherwise reinitialize delayed at next vblank | |
236 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
237 | */ | |
238 | if (!rc) | |
239 | t_vblank = (struct timeval) {0, 0}; | |
240 | ||
241 | store_vblank(dev, pipe, diff, &t_vblank, cur_vblank); | |
242 | } | |
243 | ||
244 | /* | |
245 | * Disable vblank irq's on crtc, make sure that last vblank count | |
246 | * of hardware and corresponding consistent software vblank counter | |
247 | * are preserved, even if there are any spurious vblank irq's after | |
248 | * disable. | |
249 | */ | |
250 | static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) | |
251 | { | |
252 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
253 | unsigned long irqflags; | |
254 | ||
255 | /* Prevent vblank irq processing while disabling vblank irqs, | |
256 | * so no updates of timestamps or count can happen after we've | |
257 | * disabled. Needed to prevent races in case of delayed irq's. | |
258 | */ | |
259 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
260 | ||
261 | /* | |
262 | * Only disable vblank interrupts if they're enabled. This avoids | |
263 | * calling the ->disable_vblank() operation in atomic context with the | |
264 | * hardware potentially runtime suspended. | |
265 | */ | |
266 | if (vblank->enabled) { | |
267 | dev->driver->disable_vblank(dev, pipe); | |
268 | vblank->enabled = false; | |
269 | } | |
270 | ||
271 | /* | |
272 | * Always update the count and timestamp to maintain the | |
273 | * appearance that the counter has been ticking all along until | |
274 | * this time. This makes the count account for the entire time | |
275 | * between drm_vblank_on() and drm_vblank_off(). | |
276 | */ | |
277 | drm_update_vblank_count(dev, pipe, 0); | |
278 | ||
279 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
280 | } | |
281 | ||
282 | static void vblank_disable_fn(unsigned long arg) | |
283 | { | |
284 | struct drm_vblank_crtc *vblank = (void *)arg; | |
285 | struct drm_device *dev = vblank->dev; | |
286 | unsigned int pipe = vblank->pipe; | |
287 | unsigned long irqflags; | |
288 | ||
289 | if (!dev->vblank_disable_allowed) | |
290 | return; | |
291 | ||
292 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
293 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
294 | DRM_DEBUG("disabling vblank on crtc %u\n", pipe); | |
295 | vblank_disable_and_save(dev, pipe); | |
296 | } | |
297 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
298 | } | |
299 | ||
300 | /** | |
301 | * drm_vblank_cleanup - cleanup vblank support | |
302 | * @dev: DRM device | |
303 | * | |
304 | * This function cleans up any resources allocated in drm_vblank_init. | |
305 | */ | |
306 | void drm_vblank_cleanup(struct drm_device *dev) | |
307 | { | |
308 | unsigned int pipe; | |
309 | ||
310 | /* Bail if the driver didn't call drm_vblank_init() */ | |
311 | if (dev->num_crtcs == 0) | |
312 | return; | |
313 | ||
314 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { | |
315 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
316 | ||
317 | WARN_ON(vblank->enabled && | |
318 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
319 | ||
320 | del_timer_sync(&vblank->disable_timer); | |
321 | } | |
322 | ||
323 | kfree(dev->vblank); | |
324 | ||
325 | dev->num_crtcs = 0; | |
326 | } | |
327 | EXPORT_SYMBOL(drm_vblank_cleanup); | |
328 | ||
329 | /** | |
330 | * drm_vblank_init - initialize vblank support | |
331 | * @dev: DRM device | |
332 | * @num_crtcs: number of CRTCs supported by @dev | |
333 | * | |
334 | * This function initializes vblank support for @num_crtcs display pipelines. | |
335 | * | |
336 | * Returns: | |
337 | * Zero on success or a negative error code on failure. | |
338 | */ | |
339 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) | |
340 | { | |
341 | int ret = -ENOMEM; | |
342 | unsigned int i; | |
343 | ||
344 | spin_lock_init(&dev->vbl_lock); | |
345 | spin_lock_init(&dev->vblank_time_lock); | |
346 | ||
347 | dev->num_crtcs = num_crtcs; | |
348 | ||
349 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); | |
350 | if (!dev->vblank) | |
351 | goto err; | |
352 | ||
353 | for (i = 0; i < num_crtcs; i++) { | |
354 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; | |
355 | ||
356 | vblank->dev = dev; | |
357 | vblank->pipe = i; | |
358 | init_waitqueue_head(&vblank->queue); | |
359 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
360 | (unsigned long)vblank); | |
361 | } | |
362 | ||
363 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); | |
364 | ||
365 | /* Driver specific high-precision vblank timestamping supported? */ | |
366 | if (dev->driver->get_vblank_timestamp) | |
367 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
368 | else | |
369 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
370 | ||
371 | /* Must have precise timestamping for reliable vblank instant disable */ | |
372 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
373 | dev->vblank_disable_immediate = false; | |
374 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
375 | "get_vblank_timestamp == NULL\n"); | |
376 | } | |
377 | ||
378 | dev->vblank_disable_allowed = false; | |
379 | ||
380 | return 0; | |
381 | ||
382 | err: | |
383 | dev->num_crtcs = 0; | |
384 | return ret; | |
385 | } | |
386 | EXPORT_SYMBOL(drm_vblank_init); | |
387 | ||
388 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) | |
389 | { | |
390 | struct drm_device *dev = cookie; | |
391 | ||
392 | if (dev->driver->vgaarb_irq) { | |
393 | dev->driver->vgaarb_irq(dev, state); | |
394 | return; | |
395 | } | |
396 | ||
397 | if (!dev->irq_enabled) | |
398 | return; | |
399 | ||
400 | if (state) { | |
401 | if (dev->driver->irq_uninstall) | |
402 | dev->driver->irq_uninstall(dev); | |
403 | } else { | |
404 | if (dev->driver->irq_preinstall) | |
405 | dev->driver->irq_preinstall(dev); | |
406 | if (dev->driver->irq_postinstall) | |
407 | dev->driver->irq_postinstall(dev); | |
408 | } | |
409 | } | |
410 | ||
411 | /** | |
412 | * drm_irq_install - install IRQ handler | |
413 | * @dev: DRM device | |
414 | * @irq: IRQ number to install the handler for | |
415 | * | |
416 | * Initializes the IRQ related data. Installs the handler, calling the driver | |
417 | * irq_preinstall() and irq_postinstall() functions before and after the | |
418 | * installation. | |
419 | * | |
420 | * This is the simplified helper interface provided for drivers with no special | |
421 | * needs. Drivers which need to install interrupt handlers for multiple | |
422 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
423 | * that vblank interrupts are available. | |
424 | * | |
425 | * Returns: | |
426 | * Zero on success or a negative error code on failure. | |
427 | */ | |
428 | int drm_irq_install(struct drm_device *dev, int irq) | |
429 | { | |
430 | int ret; | |
431 | unsigned long sh_flags = 0; | |
432 | ||
433 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
434 | return -EINVAL; | |
435 | ||
436 | if (irq == 0) | |
437 | return -EINVAL; | |
438 | ||
439 | /* Driver must have been initialized */ | |
440 | if (!dev->dev_private) | |
441 | return -EINVAL; | |
442 | ||
443 | if (dev->irq_enabled) | |
444 | return -EBUSY; | |
445 | dev->irq_enabled = true; | |
446 | ||
447 | DRM_DEBUG("irq=%d\n", irq); | |
448 | ||
449 | /* Before installing handler */ | |
450 | if (dev->driver->irq_preinstall) | |
451 | dev->driver->irq_preinstall(dev); | |
452 | ||
453 | /* Install handler */ | |
454 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) | |
455 | sh_flags = IRQF_SHARED; | |
456 | ||
457 | ret = request_irq(irq, dev->driver->irq_handler, | |
458 | sh_flags, dev->driver->name, dev); | |
459 | ||
460 | if (ret < 0) { | |
461 | dev->irq_enabled = false; | |
462 | return ret; | |
463 | } | |
464 | ||
465 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
466 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
467 | ||
468 | /* After installing handler */ | |
469 | if (dev->driver->irq_postinstall) | |
470 | ret = dev->driver->irq_postinstall(dev); | |
471 | ||
472 | if (ret < 0) { | |
473 | dev->irq_enabled = false; | |
474 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
475 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
476 | free_irq(irq, dev); | |
477 | } else { | |
478 | dev->irq = irq; | |
479 | } | |
480 | ||
481 | return ret; | |
482 | } | |
483 | EXPORT_SYMBOL(drm_irq_install); | |
484 | ||
485 | /** | |
486 | * drm_irq_uninstall - uninstall the IRQ handler | |
487 | * @dev: DRM device | |
488 | * | |
489 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
490 | * This should only be called by drivers which used drm_irq_install() to set up | |
491 | * their interrupt handler. Other drivers must only reset | |
492 | * drm_device->irq_enabled to false. | |
493 | * | |
494 | * Note that for kernel modesetting drivers it is a bug if this function fails. | |
495 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
496 | * the same function through an ioctl. | |
497 | * | |
498 | * Returns: | |
499 | * Zero on success or a negative error code on failure. | |
500 | */ | |
501 | int drm_irq_uninstall(struct drm_device *dev) | |
502 | { | |
503 | unsigned long irqflags; | |
504 | bool irq_enabled; | |
505 | int i; | |
506 | ||
507 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
508 | return -EINVAL; | |
509 | ||
510 | irq_enabled = dev->irq_enabled; | |
511 | dev->irq_enabled = false; | |
512 | ||
513 | /* | |
514 | * Wake up any waiters so they don't hang. This is just to paper over | |
515 | * isssues for UMS drivers which aren't in full control of their | |
516 | * vblank/irq handling. KMS drivers must ensure that vblanks are all | |
517 | * disabled when uninstalling the irq handler. | |
518 | */ | |
519 | if (dev->num_crtcs) { | |
520 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
521 | for (i = 0; i < dev->num_crtcs; i++) { | |
522 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; | |
523 | ||
524 | if (!vblank->enabled) | |
525 | continue; | |
526 | ||
527 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
528 | ||
529 | vblank_disable_and_save(dev, i); | |
530 | wake_up(&vblank->queue); | |
531 | } | |
532 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
533 | } | |
534 | ||
535 | if (!irq_enabled) | |
536 | return -EINVAL; | |
537 | ||
538 | DRM_DEBUG("irq=%d\n", dev->irq); | |
539 | ||
540 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
541 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
542 | ||
543 | if (dev->driver->irq_uninstall) | |
544 | dev->driver->irq_uninstall(dev); | |
545 | ||
546 | free_irq(dev->irq, dev); | |
547 | ||
548 | return 0; | |
549 | } | |
550 | EXPORT_SYMBOL(drm_irq_uninstall); | |
551 | ||
552 | /* | |
553 | * IRQ control ioctl. | |
554 | * | |
555 | * \param inode device inode. | |
556 | * \param file_priv DRM file private. | |
557 | * \param cmd command. | |
558 | * \param arg user argument, pointing to a drm_control structure. | |
559 | * \return zero on success or a negative number on failure. | |
560 | * | |
561 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
562 | */ | |
563 | int drm_control(struct drm_device *dev, void *data, | |
564 | struct drm_file *file_priv) | |
565 | { | |
566 | struct drm_control *ctl = data; | |
567 | int ret = 0, irq; | |
568 | ||
569 | /* if we haven't irq we fallback for compatibility reasons - | |
570 | * this used to be a separate function in drm_dma.h | |
571 | */ | |
572 | ||
573 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
574 | return 0; | |
575 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
576 | return 0; | |
577 | /* UMS was only ever support on pci devices. */ | |
578 | if (WARN_ON(!dev->pdev)) | |
579 | return -EINVAL; | |
580 | ||
581 | switch (ctl->func) { | |
582 | case DRM_INST_HANDLER: | |
583 | irq = dev->pdev->irq; | |
584 | ||
585 | if (dev->if_version < DRM_IF_VERSION(1, 2) && | |
586 | ctl->irq != irq) | |
587 | return -EINVAL; | |
588 | mutex_lock(&dev->struct_mutex); | |
589 | ret = drm_irq_install(dev, irq); | |
590 | mutex_unlock(&dev->struct_mutex); | |
591 | ||
592 | return ret; | |
593 | case DRM_UNINST_HANDLER: | |
594 | mutex_lock(&dev->struct_mutex); | |
595 | ret = drm_irq_uninstall(dev); | |
596 | mutex_unlock(&dev->struct_mutex); | |
597 | ||
598 | return ret; | |
599 | default: | |
600 | return -EINVAL; | |
601 | } | |
602 | } | |
603 | ||
604 | /** | |
605 | * drm_calc_timestamping_constants - calculate vblank timestamp constants | |
606 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
607 | * @mode: display mode containing the scanout timings | |
608 | * | |
609 | * Calculate and store various constants which are later | |
610 | * needed by vblank and swap-completion timestamping, e.g, | |
611 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
612 | * derived from CRTC's true scanout timing, so they take | |
613 | * things like panel scaling or other adjustments into account. | |
614 | */ | |
615 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, | |
616 | const struct drm_display_mode *mode) | |
617 | { | |
618 | struct drm_vblank_crtc *vblank = &crtc->dev->vblank[drm_crtc_index(crtc)]; | |
619 | int linedur_ns = 0, framedur_ns = 0; | |
620 | int dotclock = mode->crtc_clock; | |
621 | ||
622 | /* Valid dotclock? */ | |
623 | if (dotclock > 0) { | |
624 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; | |
625 | ||
626 | /* | |
627 | * Convert scanline length in pixels and video | |
628 | * dot clock to line duration and frame duration | |
629 | * in nanoseconds: | |
630 | */ | |
631 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
632 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
633 | ||
634 | /* | |
635 | * Fields of interlaced scanout modes are only half a frame duration. | |
636 | */ | |
637 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
638 | framedur_ns /= 2; | |
639 | } else | |
640 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", | |
641 | crtc->base.id); | |
642 | ||
643 | vblank->linedur_ns = linedur_ns; | |
644 | vblank->framedur_ns = framedur_ns; | |
645 | ||
646 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
647 | crtc->base.id, mode->crtc_htotal, | |
648 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
649 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n", | |
650 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
651 | } | |
652 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
653 | ||
654 | /** | |
655 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper | |
656 | * @dev: DRM device | |
657 | * @pipe: index of CRTC whose vblank timestamp to retrieve | |
658 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
659 | * On return contains true maximum error of timestamp | |
660 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
661 | * @flags: Flags to pass to driver: | |
662 | * 0 = Default, | |
663 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
664 | * @mode: mode which defines the scanout timings | |
665 | * | |
666 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
667 | * timings and current video scanout position of a CRTC. This can be called from | |
668 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
669 | * actual timestamping. | |
670 | * | |
671 | * Should return timestamps conforming to the OML_sync_control OpenML | |
672 | * extension specification. The timestamp corresponds to the end of | |
673 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
674 | * pixel in the following video frame. | |
675 | * | |
676 | * Requires support for optional dev->driver->get_scanout_position() | |
677 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
678 | * that corresponds to the true scanout timing. | |
679 | * | |
680 | * The current implementation only handles standard video modes. It | |
681 | * returns as no operation if a doublescan or interlaced video mode is | |
682 | * active. Higher level code is expected to handle this. | |
683 | * | |
684 | * Returns: | |
685 | * Negative value on error, failure or if not supported in current | |
686 | * video mode: | |
687 | * | |
688 | * -EINVAL - Invalid CRTC. | |
689 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. | |
690 | * -ENOTSUPP - Function not supported in current display mode. | |
691 | * -EIO - Failed, e.g., due to failed scanout position query. | |
692 | * | |
693 | * Returns or'ed positive status flags on success: | |
694 | * | |
695 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
696 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
697 | * | |
698 | */ | |
699 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, | |
700 | unsigned int pipe, | |
701 | int *max_error, | |
702 | struct timeval *vblank_time, | |
703 | unsigned flags, | |
704 | const struct drm_display_mode *mode) | |
705 | { | |
706 | struct timeval tv_etime; | |
707 | ktime_t stime, etime; | |
708 | unsigned int vbl_status; | |
709 | int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
710 | int vpos, hpos, i; | |
711 | int delta_ns, duration_ns; | |
712 | ||
713 | if (pipe >= dev->num_crtcs) { | |
714 | DRM_ERROR("Invalid crtc %u\n", pipe); | |
715 | return -EINVAL; | |
716 | } | |
717 | ||
718 | /* Scanout position query not supported? Should not happen. */ | |
719 | if (!dev->driver->get_scanout_position) { | |
720 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
721 | return -EIO; | |
722 | } | |
723 | ||
724 | /* If mode timing undefined, just return as no-op: | |
725 | * Happens during initial modesetting of a crtc. | |
726 | */ | |
727 | if (mode->crtc_clock == 0) { | |
728 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); | |
729 | return -EAGAIN; | |
730 | } | |
731 | ||
732 | /* Get current scanout position with system timestamp. | |
733 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
734 | * if single query takes longer than max_error nanoseconds. | |
735 | * | |
736 | * This guarantees a tight bound on maximum error if | |
737 | * code gets preempted or delayed for some reason. | |
738 | */ | |
739 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
740 | /* | |
741 | * Get vertical and horizontal scanout position vpos, hpos, | |
742 | * and bounding timestamps stime, etime, pre/post query. | |
743 | */ | |
744 | vbl_status = dev->driver->get_scanout_position(dev, pipe, flags, | |
745 | &vpos, &hpos, | |
746 | &stime, &etime, | |
747 | mode); | |
748 | ||
749 | /* Return as no-op if scanout query unsupported or failed. */ | |
750 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
751 | DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n", | |
752 | pipe, vbl_status); | |
753 | return -EIO; | |
754 | } | |
755 | ||
756 | /* Compute uncertainty in timestamp of scanout position query. */ | |
757 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); | |
758 | ||
759 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
760 | if (duration_ns <= *max_error) | |
761 | break; | |
762 | } | |
763 | ||
764 | /* Noisy system timing? */ | |
765 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
766 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", | |
767 | pipe, duration_ns/1000, *max_error/1000, i); | |
768 | } | |
769 | ||
770 | /* Return upper bound of timestamp precision error. */ | |
771 | *max_error = duration_ns; | |
772 | ||
773 | /* Check if in vblank area: | |
774 | * vpos is >=0 in video scanout area, but negative | |
775 | * within vblank area, counting down the number of lines until | |
776 | * start of scanout. | |
777 | */ | |
778 | if (vbl_status & DRM_SCANOUTPOS_IN_VBLANK) | |
779 | ret |= DRM_VBLANKTIME_IN_VBLANK; | |
780 | ||
781 | /* Convert scanout position into elapsed time at raw_time query | |
782 | * since start of scanout at first display scanline. delta_ns | |
783 | * can be negative if start of scanout hasn't happened yet. | |
784 | */ | |
785 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), | |
786 | mode->crtc_clock); | |
787 | ||
788 | if (!drm_timestamp_monotonic) | |
789 | etime = ktime_mono_to_real(etime); | |
790 | ||
791 | /* save this only for debugging purposes */ | |
792 | tv_etime = ktime_to_timeval(etime); | |
793 | /* Subtract time delta from raw timestamp to get final | |
794 | * vblank_time timestamp for end of vblank. | |
795 | */ | |
796 | if (delta_ns < 0) | |
797 | etime = ktime_add_ns(etime, -delta_ns); | |
798 | else | |
799 | etime = ktime_sub_ns(etime, delta_ns); | |
800 | *vblank_time = ktime_to_timeval(etime); | |
801 | ||
802 | DRM_DEBUG("crtc %u : v 0x%x p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", | |
803 | pipe, vbl_status, hpos, vpos, | |
804 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, | |
805 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, | |
806 | duration_ns/1000, i); | |
807 | ||
808 | return ret; | |
809 | } | |
810 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
811 | ||
812 | static struct timeval get_drm_timestamp(void) | |
813 | { | |
814 | ktime_t now; | |
815 | ||
816 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); | |
817 | return ktime_to_timeval(now); | |
818 | } | |
819 | ||
820 | /** | |
821 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
822 | * vblank interval | |
823 | * @dev: DRM device | |
824 | * @pipe: index of CRTC whose vblank timestamp to retrieve | |
825 | * @tvblank: Pointer to target struct timeval which should receive the timestamp | |
826 | * @flags: Flags to pass to driver: | |
827 | * 0 = Default, | |
828 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
829 | * | |
830 | * Fetches the system timestamp corresponding to the time of the most recent | |
831 | * vblank interval on specified CRTC. May call into kms-driver to | |
832 | * compute the timestamp with a high-precision GPU specific method. | |
833 | * | |
834 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
835 | * call, i.e., it isn't very precisely locked to the true vblank. | |
836 | * | |
837 | * Returns: | |
838 | * True if timestamp is considered to be very precise, false otherwise. | |
839 | */ | |
840 | static bool | |
841 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
842 | struct timeval *tvblank, unsigned flags) | |
843 | { | |
844 | int ret; | |
845 | ||
846 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
847 | int max_error = (int) drm_timestamp_precision * 1000; | |
848 | ||
849 | /* Query driver if possible and precision timestamping enabled. */ | |
850 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
851 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, | |
852 | tvblank, flags); | |
853 | if (ret > 0) | |
854 | return true; | |
855 | } | |
856 | ||
857 | /* GPU high precision timestamp query unsupported or failed. | |
858 | * Return current monotonic/gettimeofday timestamp as best estimate. | |
859 | */ | |
860 | *tvblank = get_drm_timestamp(); | |
861 | ||
862 | return false; | |
863 | } | |
864 | ||
865 | /** | |
866 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
867 | * @dev: DRM device | |
868 | * @pipe: index of CRTC for which to retrieve the counter | |
869 | * | |
870 | * Fetches the "cooked" vblank count value that represents the number of | |
871 | * vblank events since the system was booted, including lost events due to | |
872 | * modesetting activity. | |
873 | * | |
874 | * This is the legacy version of drm_crtc_vblank_count(). | |
875 | * | |
876 | * Returns: | |
877 | * The software vblank counter. | |
878 | */ | |
879 | u32 drm_vblank_count(struct drm_device *dev, int pipe) | |
880 | { | |
881 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
882 | ||
883 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
884 | return 0; | |
885 | ||
886 | return vblank->count; | |
887 | } | |
888 | EXPORT_SYMBOL(drm_vblank_count); | |
889 | ||
890 | /** | |
891 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
892 | * @crtc: which counter to retrieve | |
893 | * | |
894 | * Fetches the "cooked" vblank count value that represents the number of | |
895 | * vblank events since the system was booted, including lost events due to | |
896 | * modesetting activity. | |
897 | * | |
898 | * This is the native KMS version of drm_vblank_count(). | |
899 | * | |
900 | * Returns: | |
901 | * The software vblank counter. | |
902 | */ | |
903 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) | |
904 | { | |
905 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
906 | } | |
907 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
908 | ||
909 | /** | |
910 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the | |
911 | * system timestamp corresponding to that vblank counter value. | |
912 | * @dev: DRM device | |
913 | * @pipe: index of CRTC whose counter to retrieve | |
914 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
915 | * | |
916 | * Fetches the "cooked" vblank count value that represents the number of | |
917 | * vblank events since the system was booted, including lost events due to | |
918 | * modesetting activity. Returns corresponding system timestamp of the time | |
919 | * of the vblank interval that corresponds to the current vblank counter value. | |
920 | * | |
921 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
922 | */ | |
923 | u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, | |
924 | struct timeval *vblanktime) | |
925 | { | |
926 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
927 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
928 | u32 cur_vblank; | |
929 | ||
930 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
931 | return 0; | |
932 | ||
933 | /* | |
934 | * Vblank timestamps are read lockless. To ensure consistency the vblank | |
935 | * counter is rechecked and ordering is ensured using memory barriers. | |
936 | * This works like a seqlock. The write-side barriers are in store_vblank. | |
937 | */ | |
938 | do { | |
939 | cur_vblank = vblank->count; | |
940 | smp_rmb(); | |
941 | *vblanktime = vblanktimestamp(dev, pipe, cur_vblank); | |
942 | smp_rmb(); | |
943 | } while (cur_vblank != vblank->count && --count > 0); | |
944 | ||
945 | return cur_vblank; | |
946 | } | |
947 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
948 | ||
949 | /** | |
950 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
951 | * and the system timestamp corresponding to that vblank counter value | |
952 | * @crtc: which counter to retrieve | |
953 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
954 | * | |
955 | * Fetches the "cooked" vblank count value that represents the number of | |
956 | * vblank events since the system was booted, including lost events due to | |
957 | * modesetting activity. Returns corresponding system timestamp of the time | |
958 | * of the vblank interval that corresponds to the current vblank counter value. | |
959 | * | |
960 | * This is the native KMS version of drm_vblank_count_and_time(). | |
961 | */ | |
962 | u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, | |
963 | struct timeval *vblanktime) | |
964 | { | |
965 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
966 | vblanktime); | |
967 | } | |
968 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
969 | ||
970 | static void send_vblank_event(struct drm_device *dev, | |
971 | struct drm_pending_vblank_event *e, | |
972 | unsigned long seq, struct timeval *now) | |
973 | { | |
974 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
975 | e->event.sequence = seq; | |
976 | e->event.tv_sec = now->tv_sec; | |
977 | e->event.tv_usec = now->tv_usec; | |
978 | ||
979 | list_add_tail(&e->base.link, | |
980 | &e->base.file_priv->event_list); | |
981 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
982 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
983 | e->event.sequence); | |
984 | } | |
985 | ||
986 | /** | |
987 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
988 | * @dev: DRM device | |
989 | * @pipe: CRTC index | |
990 | * @e: the event to send | |
991 | * | |
992 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
993 | * Caller must hold event lock. | |
994 | * | |
995 | * This is the legacy version of drm_crtc_send_vblank_event(). | |
996 | */ | |
997 | void drm_send_vblank_event(struct drm_device *dev, unsigned int pipe, | |
998 | struct drm_pending_vblank_event *e) | |
999 | { | |
1000 | struct timeval now; | |
1001 | unsigned int seq; | |
1002 | ||
1003 | if (dev->num_crtcs > 0) { | |
1004 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1005 | } else { | |
1006 | seq = 0; | |
1007 | ||
1008 | now = get_drm_timestamp(); | |
1009 | } | |
1010 | e->pipe = pipe; | |
1011 | send_vblank_event(dev, e, seq, &now); | |
1012 | } | |
1013 | EXPORT_SYMBOL(drm_send_vblank_event); | |
1014 | ||
1015 | /** | |
1016 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
1017 | * @crtc: the source CRTC of the vblank event | |
1018 | * @e: the event to send | |
1019 | * | |
1020 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
1021 | * Caller must hold event lock. | |
1022 | * | |
1023 | * This is the native KMS version of drm_send_vblank_event(). | |
1024 | */ | |
1025 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
1026 | struct drm_pending_vblank_event *e) | |
1027 | { | |
1028 | drm_send_vblank_event(crtc->dev, drm_crtc_index(crtc), e); | |
1029 | } | |
1030 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
1031 | ||
1032 | /** | |
1033 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
1034 | * @dev: DRM device | |
1035 | * @pipe: CRTC index | |
1036 | * | |
1037 | * Returns: | |
1038 | * Zero on success or a negative error code on failure. | |
1039 | */ | |
1040 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) | |
1041 | { | |
1042 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1043 | int ret = 0; | |
1044 | ||
1045 | assert_spin_locked(&dev->vbl_lock); | |
1046 | ||
1047 | spin_lock(&dev->vblank_time_lock); | |
1048 | ||
1049 | if (!vblank->enabled) { | |
1050 | /* | |
1051 | * Enable vblank irqs under vblank_time_lock protection. | |
1052 | * All vblank count & timestamp updates are held off | |
1053 | * until we are done reinitializing master counter and | |
1054 | * timestamps. Filtercode in drm_handle_vblank() will | |
1055 | * prevent double-accounting of same vblank interval. | |
1056 | */ | |
1057 | ret = dev->driver->enable_vblank(dev, pipe); | |
1058 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); | |
1059 | if (ret) | |
1060 | atomic_dec(&vblank->refcount); | |
1061 | else { | |
1062 | vblank->enabled = true; | |
1063 | drm_update_vblank_count(dev, pipe, 0); | |
1064 | } | |
1065 | } | |
1066 | ||
1067 | spin_unlock(&dev->vblank_time_lock); | |
1068 | ||
1069 | return ret; | |
1070 | } | |
1071 | ||
1072 | /** | |
1073 | * drm_vblank_get - get a reference count on vblank events | |
1074 | * @dev: DRM device | |
1075 | * @pipe: index of CRTC to own | |
1076 | * | |
1077 | * Acquire a reference count on vblank events to avoid having them disabled | |
1078 | * while in use. | |
1079 | * | |
1080 | * This is the legacy version of drm_crtc_vblank_get(). | |
1081 | * | |
1082 | * Returns: | |
1083 | * Zero on success or a negative error code on failure. | |
1084 | */ | |
1085 | int drm_vblank_get(struct drm_device *dev, unsigned int pipe) | |
1086 | { | |
1087 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1088 | unsigned long irqflags; | |
1089 | int ret = 0; | |
1090 | ||
1091 | if (!dev->num_crtcs) | |
1092 | return -EINVAL; | |
1093 | ||
1094 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1095 | return -EINVAL; | |
1096 | ||
1097 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1098 | /* Going from 0->1 means we have to enable interrupts again */ | |
1099 | if (atomic_add_return(1, &vblank->refcount) == 1) { | |
1100 | ret = drm_vblank_enable(dev, pipe); | |
1101 | } else { | |
1102 | if (!vblank->enabled) { | |
1103 | atomic_dec(&vblank->refcount); | |
1104 | ret = -EINVAL; | |
1105 | } | |
1106 | } | |
1107 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1108 | ||
1109 | return ret; | |
1110 | } | |
1111 | EXPORT_SYMBOL(drm_vblank_get); | |
1112 | ||
1113 | /** | |
1114 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1115 | * @crtc: which CRTC to own | |
1116 | * | |
1117 | * Acquire a reference count on vblank events to avoid having them disabled | |
1118 | * while in use. | |
1119 | * | |
1120 | * This is the native kms version of drm_vblank_get(). | |
1121 | * | |
1122 | * Returns: | |
1123 | * Zero on success or a negative error code on failure. | |
1124 | */ | |
1125 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1126 | { | |
1127 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1128 | } | |
1129 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1130 | ||
1131 | /** | |
1132 | * drm_vblank_put - release ownership of vblank events | |
1133 | * @dev: DRM device | |
1134 | * @pipe: index of CRTC to release | |
1135 | * | |
1136 | * Release ownership of a given vblank counter, turning off interrupts | |
1137 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1138 | * | |
1139 | * This is the legacy version of drm_crtc_vblank_put(). | |
1140 | */ | |
1141 | void drm_vblank_put(struct drm_device *dev, unsigned int pipe) | |
1142 | { | |
1143 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1144 | ||
1145 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1146 | return; | |
1147 | ||
1148 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) | |
1149 | return; | |
1150 | ||
1151 | /* Last user schedules interrupt disable */ | |
1152 | if (atomic_dec_and_test(&vblank->refcount)) { | |
1153 | if (drm_vblank_offdelay == 0) | |
1154 | return; | |
1155 | else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) | |
1156 | vblank_disable_fn((unsigned long)vblank); | |
1157 | else | |
1158 | mod_timer(&vblank->disable_timer, | |
1159 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1160 | } | |
1161 | } | |
1162 | EXPORT_SYMBOL(drm_vblank_put); | |
1163 | ||
1164 | /** | |
1165 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1166 | * @crtc: which counter to give up | |
1167 | * | |
1168 | * Release ownership of a given vblank counter, turning off interrupts | |
1169 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1170 | * | |
1171 | * This is the native kms version of drm_vblank_put(). | |
1172 | */ | |
1173 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1174 | { | |
1175 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1176 | } | |
1177 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1178 | ||
1179 | /** | |
1180 | * drm_wait_one_vblank - wait for one vblank | |
1181 | * @dev: DRM device | |
1182 | * @pipe: CRTC index | |
1183 | * | |
1184 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. | |
1185 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
1186 | * due to lack of driver support or because the crtc is off. | |
1187 | */ | |
1188 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) | |
1189 | { | |
1190 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1191 | int ret; | |
1192 | u32 last; | |
1193 | ||
1194 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1195 | return; | |
1196 | ||
1197 | ret = drm_vblank_get(dev, pipe); | |
1198 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |
1199 | return; | |
1200 | ||
1201 | last = drm_vblank_count(dev, pipe); | |
1202 | ||
1203 | ret = wait_event_timeout(vblank->queue, | |
1204 | last != drm_vblank_count(dev, pipe), | |
1205 | msecs_to_jiffies(100)); | |
1206 | ||
1207 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); | |
1208 | ||
1209 | drm_vblank_put(dev, pipe); | |
1210 | } | |
1211 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1212 | ||
1213 | /** | |
1214 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1215 | * @crtc: DRM crtc | |
1216 | * | |
1217 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1218 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1219 | * due to lack of driver support or because the crtc is off. | |
1220 | */ | |
1221 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1222 | { | |
1223 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1224 | } | |
1225 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1226 | ||
1227 | /** | |
1228 | * drm_vblank_off - disable vblank events on a CRTC | |
1229 | * @dev: DRM device | |
1230 | * @pipe: CRTC index | |
1231 | * | |
1232 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1233 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1234 | * stored so that drm_vblank_on() can restore it again. | |
1235 | * | |
1236 | * Drivers must use this function when the hardware vblank counter can get | |
1237 | * reset, e.g. when suspending. | |
1238 | * | |
1239 | * This is the legacy version of drm_crtc_vblank_off(). | |
1240 | */ | |
1241 | void drm_vblank_off(struct drm_device *dev, unsigned int pipe) | |
1242 | { | |
1243 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1244 | struct drm_pending_vblank_event *e, *t; | |
1245 | struct timeval now; | |
1246 | unsigned long irqflags; | |
1247 | unsigned int seq; | |
1248 | ||
1249 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1250 | return; | |
1251 | ||
1252 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1253 | ||
1254 | spin_lock(&dev->vbl_lock); | |
1255 | vblank_disable_and_save(dev, pipe); | |
1256 | wake_up(&vblank->queue); | |
1257 | ||
1258 | /* | |
1259 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1260 | * the vblank interrupt by bumping the refcount. | |
1261 | */ | |
1262 | if (!vblank->inmodeset) { | |
1263 | atomic_inc(&vblank->refcount); | |
1264 | vblank->inmodeset = 1; | |
1265 | } | |
1266 | spin_unlock(&dev->vbl_lock); | |
1267 | ||
1268 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
1269 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1270 | ||
1271 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1272 | if (e->pipe != pipe) | |
1273 | continue; | |
1274 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
1275 | wanted %d, current %d\n", | |
1276 | e->event.sequence, seq); | |
1277 | list_del(&e->base.link); | |
1278 | drm_vblank_put(dev, pipe); | |
1279 | send_vblank_event(dev, e, seq, &now); | |
1280 | } | |
1281 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1282 | } | |
1283 | EXPORT_SYMBOL(drm_vblank_off); | |
1284 | ||
1285 | /** | |
1286 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1287 | * @crtc: CRTC in question | |
1288 | * | |
1289 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1290 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1291 | * stored so that drm_vblank_on can restore it again. | |
1292 | * | |
1293 | * Drivers must use this function when the hardware vblank counter can get | |
1294 | * reset, e.g. when suspending. | |
1295 | * | |
1296 | * This is the native kms version of drm_vblank_off(). | |
1297 | */ | |
1298 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1299 | { | |
1300 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1301 | } | |
1302 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1303 | ||
1304 | /** | |
1305 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
1306 | * @crtc: CRTC in question | |
1307 | * | |
1308 | * Drivers can use this function to reset the vblank state to off at load time. | |
1309 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1310 | * drm_crtc_vblank_on() functions. The difference compared to | |
1311 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1312 | * and hence doesn't need to call any driver hooks. | |
1313 | */ | |
1314 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) | |
1315 | { | |
1316 | struct drm_device *dev = crtc->dev; | |
1317 | unsigned long irqflags; | |
1318 | unsigned int pipe = drm_crtc_index(crtc); | |
1319 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1320 | ||
1321 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1322 | /* | |
1323 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1324 | * interrupt by bumping the refcount. | |
1325 | */ | |
1326 | if (!vblank->inmodeset) { | |
1327 | atomic_inc(&vblank->refcount); | |
1328 | vblank->inmodeset = 1; | |
1329 | } | |
1330 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1331 | ||
1332 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1333 | } | |
1334 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1335 | ||
1336 | /** | |
1337 | * drm_vblank_on - enable vblank events on a CRTC | |
1338 | * @dev: DRM device | |
1339 | * @pipe: CRTC index | |
1340 | * | |
1341 | * This functions restores the vblank interrupt state captured with | |
1342 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
1343 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called | |
1344 | * in driver load code to reflect the current hardware state of the crtc. | |
1345 | * | |
1346 | * This is the legacy version of drm_crtc_vblank_on(). | |
1347 | */ | |
1348 | void drm_vblank_on(struct drm_device *dev, unsigned int pipe) | |
1349 | { | |
1350 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1351 | unsigned long irqflags; | |
1352 | ||
1353 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1354 | return; | |
1355 | ||
1356 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1357 | /* Drop our private "prevent drm_vblank_get" refcount */ | |
1358 | if (vblank->inmodeset) { | |
1359 | atomic_dec(&vblank->refcount); | |
1360 | vblank->inmodeset = 0; | |
1361 | } | |
1362 | ||
1363 | drm_reset_vblank_timestamp(dev, pipe); | |
1364 | ||
1365 | /* | |
1366 | * re-enable interrupts if there are users left, or the | |
1367 | * user wishes vblank interrupts to be enabled all the time. | |
1368 | */ | |
1369 | if (atomic_read(&vblank->refcount) != 0 || | |
1370 | (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0)) | |
1371 | WARN_ON(drm_vblank_enable(dev, pipe)); | |
1372 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1373 | } | |
1374 | EXPORT_SYMBOL(drm_vblank_on); | |
1375 | ||
1376 | /** | |
1377 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1378 | * @crtc: CRTC in question | |
1379 | * | |
1380 | * This functions restores the vblank interrupt state captured with | |
1381 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
1382 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called | |
1383 | * in driver load code to reflect the current hardware state of the crtc. | |
1384 | * | |
1385 | * This is the native kms version of drm_vblank_on(). | |
1386 | */ | |
1387 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1388 | { | |
1389 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1390 | } | |
1391 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1392 | ||
1393 | /** | |
1394 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1395 | * @dev: DRM device | |
1396 | * @pipe: CRTC index | |
1397 | * | |
1398 | * Account for vblank events across mode setting events, which will likely | |
1399 | * reset the hardware frame counter. | |
1400 | * | |
1401 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1402 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1403 | * software-side vblank frame counting will ensure that there are no jumps or | |
1404 | * discontinuities. | |
1405 | * | |
1406 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1407 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1408 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1409 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1410 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1411 | * counters. | |
1412 | * | |
1413 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1414 | * again. | |
1415 | */ | |
1416 | void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe) | |
1417 | { | |
1418 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1419 | ||
1420 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
1421 | if (!dev->num_crtcs) | |
1422 | return; | |
1423 | ||
1424 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1425 | return; | |
1426 | ||
1427 | /* | |
1428 | * To avoid all the problems that might happen if interrupts | |
1429 | * were enabled/disabled around or between these calls, we just | |
1430 | * have the kernel take a reference on the CRTC (just once though | |
1431 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1432 | * so that interrupts remain enabled in the interim. | |
1433 | */ | |
1434 | if (!vblank->inmodeset) { | |
1435 | vblank->inmodeset = 0x1; | |
1436 | if (drm_vblank_get(dev, pipe) == 0) | |
1437 | vblank->inmodeset |= 0x2; | |
1438 | } | |
1439 | } | |
1440 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1441 | ||
1442 | /** | |
1443 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1444 | * @dev: DRM device | |
1445 | * @pipe: CRTC index | |
1446 | * | |
1447 | * This function again drops the temporary vblank reference acquired in | |
1448 | * drm_vblank_pre_modeset. | |
1449 | */ | |
1450 | void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe) | |
1451 | { | |
1452 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1453 | unsigned long irqflags; | |
1454 | ||
1455 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
1456 | if (!dev->num_crtcs) | |
1457 | return; | |
1458 | ||
1459 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1460 | return; | |
1461 | ||
1462 | if (vblank->inmodeset) { | |
1463 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1464 | dev->vblank_disable_allowed = true; | |
1465 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1466 | ||
1467 | if (vblank->inmodeset & 0x2) | |
1468 | drm_vblank_put(dev, pipe); | |
1469 | ||
1470 | vblank->inmodeset = 0; | |
1471 | } | |
1472 | } | |
1473 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1474 | ||
1475 | /* | |
1476 | * drm_modeset_ctl - handle vblank event counter changes across mode switch | |
1477 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1478 | * | |
1479 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1480 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1481 | * | |
1482 | * Generally the counter will reset across mode sets. If interrupts are | |
1483 | * enabled around this call, we don't have to do anything since the counter | |
1484 | * will have already been incremented. | |
1485 | */ | |
1486 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1487 | struct drm_file *file_priv) | |
1488 | { | |
1489 | struct drm_modeset_ctl *modeset = data; | |
1490 | unsigned int pipe; | |
1491 | ||
1492 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1493 | if (!dev->num_crtcs) | |
1494 | return 0; | |
1495 | ||
1496 | /* KMS drivers handle this internally */ | |
1497 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1498 | return 0; | |
1499 | ||
1500 | pipe = modeset->crtc; | |
1501 | if (pipe >= dev->num_crtcs) | |
1502 | return -EINVAL; | |
1503 | ||
1504 | switch (modeset->cmd) { | |
1505 | case _DRM_PRE_MODESET: | |
1506 | drm_vblank_pre_modeset(dev, pipe); | |
1507 | break; | |
1508 | case _DRM_POST_MODESET: | |
1509 | drm_vblank_post_modeset(dev, pipe); | |
1510 | break; | |
1511 | default: | |
1512 | return -EINVAL; | |
1513 | } | |
1514 | ||
1515 | return 0; | |
1516 | } | |
1517 | ||
1518 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, | |
1519 | union drm_wait_vblank *vblwait, | |
1520 | struct drm_file *file_priv) | |
1521 | { | |
1522 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1523 | struct drm_pending_vblank_event *e; | |
1524 | struct timeval now; | |
1525 | unsigned long flags; | |
1526 | unsigned int seq; | |
1527 | int ret; | |
1528 | ||
1529 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
1530 | if (e == NULL) { | |
1531 | ret = -ENOMEM; | |
1532 | goto err_put; | |
1533 | } | |
1534 | ||
1535 | e->pipe = pipe; | |
1536 | e->base.pid = current->pid; | |
1537 | e->event.base.type = DRM_EVENT_VBLANK; | |
1538 | e->event.base.length = sizeof(e->event); | |
1539 | e->event.user_data = vblwait->request.signal; | |
1540 | e->base.event = &e->event.base; | |
1541 | e->base.file_priv = file_priv; | |
1542 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1543 | ||
1544 | spin_lock_irqsave(&dev->event_lock, flags); | |
1545 | ||
1546 | /* | |
1547 | * drm_vblank_off() might have been called after we called | |
1548 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1549 | * around the vblank disable, so no need for further locking. | |
1550 | * The reference from drm_vblank_get() protects against | |
1551 | * vblank disable from another source. | |
1552 | */ | |
1553 | if (!vblank->enabled) { | |
1554 | ret = -EINVAL; | |
1555 | goto err_unlock; | |
1556 | } | |
1557 | ||
1558 | if (file_priv->event_space < sizeof(e->event)) { | |
1559 | ret = -EBUSY; | |
1560 | goto err_unlock; | |
1561 | } | |
1562 | ||
1563 | file_priv->event_space -= sizeof(e->event); | |
1564 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1565 | ||
1566 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && | |
1567 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1568 | vblwait->request.sequence = seq + 1; | |
1569 | vblwait->reply.sequence = vblwait->request.sequence; | |
1570 | } | |
1571 | ||
1572 | DRM_DEBUG("event on vblank count %d, current %d, crtc %u\n", | |
1573 | vblwait->request.sequence, seq, pipe); | |
1574 | ||
1575 | trace_drm_vblank_event_queued(current->pid, pipe, | |
1576 | vblwait->request.sequence); | |
1577 | ||
1578 | e->event.sequence = vblwait->request.sequence; | |
1579 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
1580 | drm_vblank_put(dev, pipe); | |
1581 | send_vblank_event(dev, e, seq, &now); | |
1582 | vblwait->reply.sequence = seq; | |
1583 | } else { | |
1584 | /* drm_handle_vblank_events will call drm_vblank_put */ | |
1585 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
1586 | vblwait->reply.sequence = vblwait->request.sequence; | |
1587 | } | |
1588 | ||
1589 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1590 | ||
1591 | return 0; | |
1592 | ||
1593 | err_unlock: | |
1594 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1595 | kfree(e); | |
1596 | err_put: | |
1597 | drm_vblank_put(dev, pipe); | |
1598 | return ret; | |
1599 | } | |
1600 | ||
1601 | /* | |
1602 | * Wait for VBLANK. | |
1603 | * | |
1604 | * \param inode device inode. | |
1605 | * \param file_priv DRM file private. | |
1606 | * \param cmd command. | |
1607 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1608 | * \return zero on success or a negative number on failure. | |
1609 | * | |
1610 | * This function enables the vblank interrupt on the pipe requested, then | |
1611 | * sleeps waiting for the requested sequence number to occur, and drops | |
1612 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that | |
1613 | * after a timeout with no further vblank waits scheduled). | |
1614 | */ | |
1615 | int drm_wait_vblank(struct drm_device *dev, void *data, | |
1616 | struct drm_file *file_priv) | |
1617 | { | |
1618 | struct drm_vblank_crtc *vblank; | |
1619 | union drm_wait_vblank *vblwait = data; | |
1620 | int ret; | |
1621 | unsigned int flags, seq, pipe, high_pipe; | |
1622 | ||
1623 | if (!dev->irq_enabled) | |
1624 | return -EINVAL; | |
1625 | ||
1626 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) | |
1627 | return -EINVAL; | |
1628 | ||
1629 | if (vblwait->request.type & | |
1630 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1631 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
1632 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", | |
1633 | vblwait->request.type, | |
1634 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1635 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
1636 | return -EINVAL; | |
1637 | } | |
1638 | ||
1639 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; | |
1640 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); | |
1641 | if (high_pipe) | |
1642 | pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1643 | else | |
1644 | pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
1645 | if (pipe >= dev->num_crtcs) | |
1646 | return -EINVAL; | |
1647 | ||
1648 | vblank = &dev->vblank[pipe]; | |
1649 | ||
1650 | ret = drm_vblank_get(dev, pipe); | |
1651 | if (ret) { | |
1652 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); | |
1653 | return ret; | |
1654 | } | |
1655 | seq = drm_vblank_count(dev, pipe); | |
1656 | ||
1657 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { | |
1658 | case _DRM_VBLANK_RELATIVE: | |
1659 | vblwait->request.sequence += seq; | |
1660 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1661 | case _DRM_VBLANK_ABSOLUTE: | |
1662 | break; | |
1663 | default: | |
1664 | ret = -EINVAL; | |
1665 | goto done; | |
1666 | } | |
1667 | ||
1668 | if (flags & _DRM_VBLANK_EVENT) { | |
1669 | /* must hold on to the vblank ref until the event fires | |
1670 | * drm_vblank_put will be called asynchronously | |
1671 | */ | |
1672 | return drm_queue_vblank_event(dev, pipe, vblwait, file_priv); | |
1673 | } | |
1674 | ||
1675 | if ((flags & _DRM_VBLANK_NEXTONMISS) && | |
1676 | (seq - vblwait->request.sequence) <= (1<<23)) { | |
1677 | vblwait->request.sequence = seq + 1; | |
1678 | } | |
1679 | ||
1680 | DRM_DEBUG("waiting on vblank count %d, crtc %u\n", | |
1681 | vblwait->request.sequence, pipe); | |
1682 | vblank->last_wait = vblwait->request.sequence; | |
1683 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
1684 | (((drm_vblank_count(dev, pipe) - | |
1685 | vblwait->request.sequence) <= (1 << 23)) || | |
1686 | !vblank->enabled || | |
1687 | !dev->irq_enabled)); | |
1688 | ||
1689 | if (ret != -EINTR) { | |
1690 | struct timeval now; | |
1691 | ||
1692 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, pipe, &now); | |
1693 | vblwait->reply.tval_sec = now.tv_sec; | |
1694 | vblwait->reply.tval_usec = now.tv_usec; | |
1695 | ||
1696 | DRM_DEBUG("returning %d to client\n", | |
1697 | vblwait->reply.sequence); | |
1698 | } else { | |
1699 | DRM_DEBUG("vblank wait interrupted by signal\n"); | |
1700 | } | |
1701 | ||
1702 | done: | |
1703 | drm_vblank_put(dev, pipe); | |
1704 | return ret; | |
1705 | } | |
1706 | ||
1707 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) | |
1708 | { | |
1709 | struct drm_pending_vblank_event *e, *t; | |
1710 | struct timeval now; | |
1711 | unsigned int seq; | |
1712 | ||
1713 | assert_spin_locked(&dev->event_lock); | |
1714 | ||
1715 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1716 | ||
1717 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1718 | if (e->pipe != pipe) | |
1719 | continue; | |
1720 | if ((seq - e->event.sequence) > (1<<23)) | |
1721 | continue; | |
1722 | ||
1723 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1724 | e->event.sequence, seq); | |
1725 | ||
1726 | list_del(&e->base.link); | |
1727 | drm_vblank_put(dev, pipe); | |
1728 | send_vblank_event(dev, e, seq, &now); | |
1729 | } | |
1730 | ||
1731 | trace_drm_vblank_event(pipe, seq); | |
1732 | } | |
1733 | ||
1734 | /** | |
1735 | * drm_handle_vblank - handle a vblank event | |
1736 | * @dev: DRM device | |
1737 | * @pipe: index of CRTC where this event occurred | |
1738 | * | |
1739 | * Drivers should call this routine in their vblank interrupt handlers to | |
1740 | * update the vblank counter and send any signals that may be pending. | |
1741 | * | |
1742 | * This is the legacy version of drm_crtc_handle_vblank(). | |
1743 | */ | |
1744 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) | |
1745 | { | |
1746 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1747 | unsigned long irqflags; | |
1748 | ||
1749 | if (WARN_ON_ONCE(!dev->num_crtcs)) | |
1750 | return false; | |
1751 | ||
1752 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1753 | return false; | |
1754 | ||
1755 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1756 | ||
1757 | /* Need timestamp lock to prevent concurrent execution with | |
1758 | * vblank enable/disable, as this would cause inconsistent | |
1759 | * or corrupted timestamps and vblank counts. | |
1760 | */ | |
1761 | spin_lock(&dev->vblank_time_lock); | |
1762 | ||
1763 | /* Vblank irq handling disabled. Nothing to do. */ | |
1764 | if (!vblank->enabled) { | |
1765 | spin_unlock(&dev->vblank_time_lock); | |
1766 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1767 | return false; | |
1768 | } | |
1769 | ||
1770 | drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ); | |
1771 | ||
1772 | spin_unlock(&dev->vblank_time_lock); | |
1773 | ||
1774 | wake_up(&vblank->queue); | |
1775 | drm_handle_vblank_events(dev, pipe); | |
1776 | ||
1777 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1778 | ||
1779 | return true; | |
1780 | } | |
1781 | EXPORT_SYMBOL(drm_handle_vblank); | |
1782 | ||
1783 | /** | |
1784 | * drm_crtc_handle_vblank - handle a vblank event | |
1785 | * @crtc: where this event occurred | |
1786 | * | |
1787 | * Drivers should call this routine in their vblank interrupt handlers to | |
1788 | * update the vblank counter and send any signals that may be pending. | |
1789 | * | |
1790 | * This is the native KMS version of drm_handle_vblank(). | |
1791 | * | |
1792 | * Returns: | |
1793 | * True if the event was successfully handled, false on failure. | |
1794 | */ | |
1795 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1796 | { | |
1797 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1798 | } | |
1799 | EXPORT_SYMBOL(drm_crtc_handle_vblank); |