Line data Source code
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 <dev/pci/drm/drmP.h>
36 : #include "drm_trace.h"
37 : #include "drm_internal.h"
38 :
39 : #ifdef __linux__
40 : #include <linux/interrupt.h> /* For task queue support */
41 : #include <linux/slab.h>
42 :
43 : #include <linux/vgaarb.h>
44 : #include <linux/export.h>
45 : #endif
46 :
47 : /* Access macro for slots in vblank timestamp ringbuffer. */
48 : #define vblanktimestamp(dev, pipe, count) \
49 : ((dev)->vblank[pipe].time[(count) % DRM_VBLANKTIME_RBSIZE])
50 :
51 : /* Retry timestamp calculation up to 3 times to satisfy
52 : * drm_timestamp_precision before giving up.
53 : */
54 : #define DRM_TIMESTAMP_MAXRETRIES 3
55 :
56 : /* Threshold in nanoseconds for detection of redundant
57 : * vblank irq in drm_handle_vblank(). 1 msec should be ok.
58 : */
59 : #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
60 :
61 : static bool
62 : drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
63 : struct timeval *tvblank, unsigned flags);
64 :
65 : static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
66 :
67 : /*
68 : * Default to use monotonic timestamps for wait-for-vblank and page-flip
69 : * complete events.
70 : */
71 : unsigned int drm_timestamp_monotonic = 1;
72 :
73 : static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */
74 :
75 : module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
76 : module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
77 : module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
78 :
79 0 : static void store_vblank(struct drm_device *dev, unsigned int pipe,
80 : u32 vblank_count_inc,
81 : struct timeval *t_vblank, u32 last)
82 : {
83 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
84 : u32 tslot;
85 :
86 0 : assert_spin_locked(&dev->vblank_time_lock);
87 :
88 0 : vblank->last = last;
89 :
90 : /* All writers hold the spinlock, but readers are serialized by
91 : * the latching of vblank->count below.
92 : */
93 0 : tslot = vblank->count + vblank_count_inc;
94 0 : vblanktimestamp(dev, pipe, tslot) = *t_vblank;
95 :
96 : /*
97 : * vblank timestamp updates are protected on the write side with
98 : * vblank_time_lock, but on the read side done locklessly using a
99 : * sequence-lock on the vblank counter. Ensure correct ordering using
100 : * memory barrriers. We need the barrier both before and also after the
101 : * counter update to synchronize with the next timestamp write.
102 : * The read-side barriers for this are in drm_vblank_count_and_time.
103 : */
104 0 : smp_wmb();
105 0 : vblank->count += vblank_count_inc;
106 0 : smp_wmb();
107 0 : }
108 :
109 : /**
110 : * drm_reset_vblank_timestamp - reset the last timestamp to the last vblank
111 : * @dev: DRM device
112 : * @pipe: index of CRTC for which to reset the timestamp
113 : *
114 : * Reset the stored timestamp for the current vblank count to correspond
115 : * to the last vblank occurred.
116 : *
117 : * Only to be called from drm_vblank_on().
118 : *
119 : * Note: caller must hold dev->vbl_lock since this reads & writes
120 : * device vblank fields.
121 : */
122 0 : static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe)
123 : {
124 : u32 cur_vblank;
125 : bool rc;
126 0 : struct timeval t_vblank;
127 : int count = DRM_TIMESTAMP_MAXRETRIES;
128 :
129 0 : spin_lock(&dev->vblank_time_lock);
130 :
131 : /*
132 : * sample the current counter to avoid random jumps
133 : * when drm_vblank_enable() applies the diff
134 : */
135 0 : do {
136 0 : cur_vblank = dev->driver->get_vblank_counter(dev, pipe);
137 0 : rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0);
138 0 : } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0);
139 :
140 : /*
141 : * Only reinitialize corresponding vblank timestamp if high-precision query
142 : * available and didn't fail. Otherwise reinitialize delayed at next vblank
143 : * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid.
144 : */
145 0 : if (!rc)
146 0 : t_vblank = (struct timeval) {0, 0};
147 :
148 : /*
149 : * +1 to make sure user will never see the same
150 : * vblank counter value before and after a modeset
151 : */
152 0 : store_vblank(dev, pipe, 1, &t_vblank, cur_vblank);
153 :
154 0 : spin_unlock(&dev->vblank_time_lock);
155 0 : }
156 :
157 : /**
158 : * drm_update_vblank_count - update the master vblank counter
159 : * @dev: DRM device
160 : * @pipe: counter to update
161 : *
162 : * Call back into the driver to update the appropriate vblank counter
163 : * (specified by @pipe). Deal with wraparound, if it occurred, and
164 : * update the last read value so we can deal with wraparound on the next
165 : * call if necessary.
166 : *
167 : * Only necessary when going from off->on, to account for frames we
168 : * didn't get an interrupt for.
169 : *
170 : * Note: caller must hold dev->vbl_lock since this reads & writes
171 : * device vblank fields.
172 : */
173 0 : static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
174 : unsigned long flags)
175 : {
176 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
177 : u32 cur_vblank, diff;
178 : bool rc;
179 0 : struct timeval t_vblank;
180 : int count = DRM_TIMESTAMP_MAXRETRIES;
181 0 : int framedur_ns = vblank->framedur_ns;
182 :
183 : /*
184 : * Interrupts were disabled prior to this call, so deal with counter
185 : * wrap if needed.
186 : * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events
187 : * here if the register is small or we had vblank interrupts off for
188 : * a long time.
189 : *
190 : * We repeat the hardware vblank counter & timestamp query until
191 : * we get consistent results. This to prevent races between gpu
192 : * updating its hardware counter while we are retrieving the
193 : * corresponding vblank timestamp.
194 : */
195 0 : do {
196 0 : cur_vblank = dev->driver->get_vblank_counter(dev, pipe);
197 0 : rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags);
198 0 : } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0);
199 :
200 0 : if (dev->max_vblank_count != 0) {
201 : /* trust the hw counter when it's around */
202 0 : diff = (cur_vblank - vblank->last) & dev->max_vblank_count;
203 0 : } else if (rc && framedur_ns) {
204 : const struct timeval *t_old;
205 : u64 diff_ns;
206 :
207 0 : t_old = &vblanktimestamp(dev, pipe, vblank->count);
208 0 : diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old);
209 :
210 : /*
211 : * Figure out how many vblanks we've missed based
212 : * on the difference in the timestamps and the
213 : * frame/field duration.
214 : */
215 0 : diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);
216 :
217 : if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ)
218 : DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored."
219 : " diff_ns = %lld, framedur_ns = %d)\n",
220 : pipe, (long long) diff_ns, framedur_ns);
221 0 : } else {
222 : /* some kind of default for drivers w/o accurate vbl timestamping */
223 0 : diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0;
224 : }
225 :
226 : /*
227 : * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset
228 : * interval? If so then vblank irqs keep running and it will likely
229 : * happen that the hardware vblank counter is not trustworthy as it
230 : * might reset at some point in that interval and vblank timestamps
231 : * are not trustworthy either in that interval. Iow. this can result
232 : * in a bogus diff >> 1 which must be avoided as it would cause
233 : * random large forward jumps of the software vblank counter.
234 : */
235 0 : if (diff > 1 && (vblank->inmodeset & 0x2)) {
236 : DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u"
237 : " due to pre-modeset.\n", pipe, diff);
238 : diff = 1;
239 0 : }
240 :
241 : /*
242 : * FIMXE: Need to replace this hack with proper seqlocks.
243 : *
244 : * Restrict the bump of the software vblank counter to a safe maximum
245 : * value of +1 whenever there is the possibility that concurrent readers
246 : * of vblank timestamps could be active at the moment, as the current
247 : * implementation of the timestamp caching and updating is not safe
248 : * against concurrent readers for calls to store_vblank() with a bump
249 : * of anything but +1. A bump != 1 would very likely return corrupted
250 : * timestamps to userspace, because the same slot in the cache could
251 : * be concurrently written by store_vblank() and read by one of those
252 : * readers without the read-retry logic detecting the collision.
253 : *
254 : * Concurrent readers can exist when we are called from the
255 : * drm_vblank_off() or drm_vblank_on() functions and other non-vblank-
256 : * irq callers. However, all those calls to us are happening with the
257 : * vbl_lock locked to prevent drm_vblank_get(), so the vblank refcount
258 : * can't increase while we are executing. Therefore a zero refcount at
259 : * this point is safe for arbitrary counter bumps if we are called
260 : * outside vblank irq, a non-zero count is not 100% safe. Unfortunately
261 : * we must also accept a refcount of 1, as whenever we are called from
262 : * drm_vblank_get() -> drm_vblank_enable() the refcount will be 1 and
263 : * we must let that one pass through in order to not lose vblank counts
264 : * during vblank irq off - which would completely defeat the whole
265 : * point of this routine.
266 : *
267 : * Whenever we are called from vblank irq, we have to assume concurrent
268 : * readers exist or can show up any time during our execution, even if
269 : * the refcount is currently zero, as vblank irqs are usually only
270 : * enabled due to the presence of readers, and because when we are called
271 : * from vblank irq we can't hold the vbl_lock to protect us from sudden
272 : * bumps in vblank refcount. Therefore also restrict bumps to +1 when
273 : * called from vblank irq.
274 : */
275 0 : if ((diff > 1) && (atomic_read(&vblank->refcount) > 1 ||
276 0 : (flags & DRM_CALLED_FROM_VBLIRQ))) {
277 : DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u "
278 : "refcount %u, vblirq %u\n", pipe, diff,
279 : atomic_read(&vblank->refcount),
280 : (flags & DRM_CALLED_FROM_VBLIRQ) != 0);
281 : diff = 1;
282 0 : }
283 :
284 : DRM_DEBUG_VBL("updating vblank count on crtc %u:"
285 : " current=%u, diff=%u, hw=%u hw_last=%u\n",
286 : pipe, vblank->count, diff, cur_vblank, vblank->last);
287 :
288 0 : if (diff == 0) {
289 0 : WARN_ON_ONCE(cur_vblank != vblank->last);
290 0 : return;
291 : }
292 :
293 : /*
294 : * Only reinitialize corresponding vblank timestamp if high-precision query
295 : * available and didn't fail, or we were called from the vblank interrupt.
296 : * Otherwise reinitialize delayed at next vblank interrupt and assign 0
297 : * for now, to mark the vblanktimestamp as invalid.
298 : */
299 0 : if (!rc && (flags & DRM_CALLED_FROM_VBLIRQ) == 0)
300 0 : t_vblank = (struct timeval) {0, 0};
301 :
302 0 : store_vblank(dev, pipe, diff, &t_vblank, cur_vblank);
303 0 : }
304 :
305 : /*
306 : * Disable vblank irq's on crtc, make sure that last vblank count
307 : * of hardware and corresponding consistent software vblank counter
308 : * are preserved, even if there are any spurious vblank irq's after
309 : * disable.
310 : */
311 0 : static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe)
312 : {
313 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
314 : unsigned long irqflags;
315 :
316 : /* Prevent vblank irq processing while disabling vblank irqs,
317 : * so no updates of timestamps or count can happen after we've
318 : * disabled. Needed to prevent races in case of delayed irq's.
319 : */
320 0 : spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
321 :
322 : /*
323 : * Only disable vblank interrupts if they're enabled. This avoids
324 : * calling the ->disable_vblank() operation in atomic context with the
325 : * hardware potentially runtime suspended.
326 : */
327 0 : if (vblank->enabled) {
328 0 : dev->driver->disable_vblank(dev, pipe);
329 0 : vblank->enabled = false;
330 0 : }
331 :
332 : /*
333 : * Always update the count and timestamp to maintain the
334 : * appearance that the counter has been ticking all along until
335 : * this time. This makes the count account for the entire time
336 : * between drm_vblank_on() and drm_vblank_off().
337 : */
338 0 : drm_update_vblank_count(dev, pipe, 0);
339 :
340 0 : spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
341 0 : }
342 :
343 0 : static void vblank_disable_fn(unsigned long arg)
344 : {
345 0 : struct drm_vblank_crtc *vblank = (void *)arg;
346 0 : struct drm_device *dev = vblank->dev;
347 0 : unsigned int pipe = vblank->pipe;
348 : unsigned long irqflags;
349 :
350 0 : if (!dev->vblank_disable_allowed)
351 0 : return;
352 :
353 0 : spin_lock_irqsave(&dev->vbl_lock, irqflags);
354 0 : if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) {
355 : DRM_DEBUG("disabling vblank on crtc %u\n", pipe);
356 0 : vblank_disable_and_save(dev, pipe);
357 0 : }
358 0 : spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
359 0 : }
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.
366 : */
367 0 : void drm_vblank_cleanup(struct drm_device *dev)
368 : {
369 : unsigned int pipe;
370 :
371 : /* Bail if the driver didn't call drm_vblank_init() */
372 0 : if (dev->num_crtcs == 0)
373 0 : return;
374 :
375 0 : for (pipe = 0; pipe < dev->num_crtcs; pipe++) {
376 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
377 :
378 0 : WARN_ON(vblank->enabled &&
379 : drm_core_check_feature(dev, DRIVER_MODESET));
380 :
381 0 : del_timer_sync(&vblank->disable_timer);
382 : }
383 :
384 0 : kfree(dev->vblank);
385 :
386 0 : dev->num_crtcs = 0;
387 0 : }
388 : EXPORT_SYMBOL(drm_vblank_cleanup);
389 :
390 : /**
391 : * drm_vblank_init - initialize vblank support
392 : * @dev: DRM device
393 : * @num_crtcs: number of CRTCs supported by @dev
394 : *
395 : * This function initializes vblank support for @num_crtcs display pipelines.
396 : *
397 : * Returns:
398 : * Zero on success or a negative error code on failure.
399 : */
400 0 : int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
401 : {
402 : int ret = -ENOMEM;
403 : unsigned int i;
404 :
405 0 : mtx_init(&dev->vbl_lock, IPL_TTY);
406 0 : mtx_init(&dev->vblank_time_lock, IPL_TTY);
407 :
408 0 : dev->num_crtcs = num_crtcs;
409 :
410 0 : dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL);
411 0 : if (!dev->vblank)
412 : goto err;
413 :
414 0 : for (i = 0; i < num_crtcs; i++) {
415 0 : struct drm_vblank_crtc *vblank = &dev->vblank[i];
416 :
417 0 : vblank->dev = dev;
418 0 : vblank->pipe = i;
419 0 : init_waitqueue_head(&vblank->queue);
420 0 : setup_timer(&vblank->disable_timer, vblank_disable_fn,
421 : (unsigned long)vblank);
422 : }
423 :
424 : DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n");
425 :
426 : /* Driver specific high-precision vblank timestamping supported? */
427 0 : if (dev->driver->get_vblank_timestamp)
428 : DRM_INFO("Driver supports precise vblank timestamp query.\n");
429 : else
430 : DRM_INFO("No driver support for vblank timestamp query.\n");
431 :
432 : /* Must have precise timestamping for reliable vblank instant disable */
433 0 : if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) {
434 0 : dev->vblank_disable_immediate = false;
435 : DRM_INFO("Setting vblank_disable_immediate to false because "
436 : "get_vblank_timestamp == NULL\n");
437 0 : }
438 :
439 0 : dev->vblank_disable_allowed = false;
440 :
441 0 : return 0;
442 :
443 : err:
444 0 : dev->num_crtcs = 0;
445 0 : return ret;
446 0 : }
447 : EXPORT_SYMBOL(drm_vblank_init);
448 :
449 0 : static void drm_irq_vgaarb_nokms(void *cookie, bool state)
450 : {
451 0 : struct drm_device *dev = cookie;
452 :
453 : #ifdef __linux__
454 : if (dev->driver->vgaarb_irq) {
455 : dev->driver->vgaarb_irq(dev, state);
456 : return;
457 : }
458 : #endif
459 :
460 0 : if (!dev->irq_enabled)
461 0 : return;
462 :
463 0 : if (state) {
464 0 : if (dev->driver->irq_uninstall)
465 0 : dev->driver->irq_uninstall(dev);
466 : } else {
467 0 : if (dev->driver->irq_preinstall)
468 0 : dev->driver->irq_preinstall(dev);
469 0 : if (dev->driver->irq_postinstall)
470 0 : dev->driver->irq_postinstall(dev);
471 : }
472 0 : }
473 :
474 : /**
475 : * drm_irq_install - install IRQ handler
476 : * @dev: DRM device
477 : * @irq: IRQ number to install the handler for
478 : *
479 : * Initializes the IRQ related data. Installs the handler, calling the driver
480 : * irq_preinstall() and irq_postinstall() functions before and after the
481 : * installation.
482 : *
483 : * This is the simplified helper interface provided for drivers with no special
484 : * needs. Drivers which need to install interrupt handlers for multiple
485 : * interrupts must instead set drm_device->irq_enabled to signal the DRM core
486 : * that vblank interrupts are available.
487 : *
488 : * Returns:
489 : * Zero on success or a negative error code on failure.
490 : */
491 0 : int drm_irq_install(struct drm_device *dev, int irq)
492 : {
493 : int ret;
494 : unsigned long sh_flags = 0;
495 :
496 0 : if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
497 0 : return -EINVAL;
498 :
499 0 : if (irq == 0)
500 0 : return -EINVAL;
501 :
502 : /* Driver must have been initialized */
503 0 : if (!dev->dev_private)
504 0 : return -EINVAL;
505 :
506 0 : if (dev->irq_enabled)
507 0 : return -EBUSY;
508 0 : dev->irq_enabled = true;
509 :
510 : DRM_DEBUG("irq=%d\n", irq);
511 :
512 : /* Before installing handler */
513 0 : if (dev->driver->irq_preinstall)
514 0 : dev->driver->irq_preinstall(dev);
515 :
516 : /* Install handler */
517 0 : if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
518 0 : sh_flags = IRQF_SHARED;
519 :
520 : ret = request_irq(irq, dev->driver->irq_handler,
521 : sh_flags, dev->driver->name, dev);
522 :
523 0 : if (ret < 0) {
524 0 : dev->irq_enabled = false;
525 0 : return ret;
526 : }
527 :
528 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
529 0 : vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL);
530 :
531 : /* After installing handler */
532 0 : if (dev->driver->irq_postinstall)
533 0 : ret = dev->driver->irq_postinstall(dev);
534 :
535 0 : if (ret < 0) {
536 0 : dev->irq_enabled = false;
537 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
538 0 : vga_client_register(dev->pdev, NULL, NULL, NULL);
539 : free_irq(irq, dev);
540 : } else {
541 0 : dev->irq = irq;
542 : }
543 :
544 0 : return ret;
545 0 : }
546 : EXPORT_SYMBOL(drm_irq_install);
547 :
548 : /**
549 : * drm_irq_uninstall - uninstall the IRQ handler
550 : * @dev: DRM device
551 : *
552 : * Calls the driver's irq_uninstall() function and unregisters the IRQ handler.
553 : * This should only be called by drivers which used drm_irq_install() to set up
554 : * their interrupt handler. Other drivers must only reset
555 : * drm_device->irq_enabled to false.
556 : *
557 : * Note that for kernel modesetting drivers it is a bug if this function fails.
558 : * The sanity checks are only to catch buggy user modesetting drivers which call
559 : * the same function through an ioctl.
560 : *
561 : * Returns:
562 : * Zero on success or a negative error code on failure.
563 : */
564 0 : int drm_irq_uninstall(struct drm_device *dev)
565 : {
566 : unsigned long irqflags;
567 : bool irq_enabled;
568 : int i;
569 :
570 0 : if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
571 0 : return -EINVAL;
572 :
573 0 : irq_enabled = dev->irq_enabled;
574 0 : dev->irq_enabled = false;
575 :
576 : /*
577 : * Wake up any waiters so they don't hang. This is just to paper over
578 : * isssues for UMS drivers which aren't in full control of their
579 : * vblank/irq handling. KMS drivers must ensure that vblanks are all
580 : * disabled when uninstalling the irq handler.
581 : */
582 0 : if (dev->num_crtcs) {
583 0 : spin_lock_irqsave(&dev->vbl_lock, irqflags);
584 0 : for (i = 0; i < dev->num_crtcs; i++) {
585 0 : struct drm_vblank_crtc *vblank = &dev->vblank[i];
586 :
587 0 : if (!vblank->enabled)
588 0 : continue;
589 :
590 0 : WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET));
591 :
592 0 : vblank_disable_and_save(dev, i);
593 0 : wake_up(&vblank->queue);
594 0 : }
595 0 : spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
596 0 : }
597 :
598 0 : if (!irq_enabled)
599 0 : return -EINVAL;
600 :
601 : DRM_DEBUG("irq=%d\n", dev->irq);
602 :
603 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
604 0 : vga_client_register(dev->pdev, NULL, NULL, NULL);
605 :
606 0 : if (dev->driver->irq_uninstall)
607 0 : dev->driver->irq_uninstall(dev);
608 :
609 : free_irq(dev->irq, dev);
610 :
611 0 : return 0;
612 0 : }
613 : EXPORT_SYMBOL(drm_irq_uninstall);
614 :
615 : /*
616 : * IRQ control ioctl.
617 : *
618 : * \param inode device inode.
619 : * \param file_priv DRM file private.
620 : * \param cmd command.
621 : * \param arg user argument, pointing to a drm_control structure.
622 : * \return zero on success or a negative number on failure.
623 : *
624 : * Calls irq_install() or irq_uninstall() according to \p arg.
625 : */
626 0 : int drm_control(struct drm_device *dev, void *data,
627 : struct drm_file *file_priv)
628 : {
629 0 : struct drm_control *ctl = data;
630 : int ret = 0, irq;
631 :
632 : /* if we haven't irq we fallback for compatibility reasons -
633 : * this used to be a separate function in drm_dma.h
634 : */
635 :
636 0 : if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
637 0 : return 0;
638 0 : if (drm_core_check_feature(dev, DRIVER_MODESET))
639 0 : return 0;
640 : /* UMS was only ever support on pci devices. */
641 0 : if (WARN_ON(!dev->pdev))
642 0 : return -EINVAL;
643 :
644 0 : switch (ctl->func) {
645 : case DRM_INST_HANDLER:
646 0 : irq = dev->pdev->irq;
647 :
648 0 : if (dev->if_version < DRM_IF_VERSION(1, 2) &&
649 0 : ctl->irq != irq)
650 0 : return -EINVAL;
651 0 : mutex_lock(&dev->struct_mutex);
652 0 : ret = drm_irq_install(dev, irq);
653 0 : mutex_unlock(&dev->struct_mutex);
654 :
655 0 : return ret;
656 : case DRM_UNINST_HANDLER:
657 0 : mutex_lock(&dev->struct_mutex);
658 0 : ret = drm_irq_uninstall(dev);
659 0 : mutex_unlock(&dev->struct_mutex);
660 :
661 0 : return ret;
662 : default:
663 0 : return -EINVAL;
664 : }
665 0 : }
666 :
667 : /**
668 : * drm_calc_timestamping_constants - calculate vblank timestamp constants
669 : * @crtc: drm_crtc whose timestamp constants should be updated.
670 : * @mode: display mode containing the scanout timings
671 : *
672 : * Calculate and store various constants which are later
673 : * needed by vblank and swap-completion timestamping, e.g,
674 : * by drm_calc_vbltimestamp_from_scanoutpos(). They are
675 : * derived from CRTC's true scanout timing, so they take
676 : * things like panel scaling or other adjustments into account.
677 : */
678 0 : void drm_calc_timestamping_constants(struct drm_crtc *crtc,
679 : const struct drm_display_mode *mode)
680 : {
681 0 : struct drm_device *dev = crtc->dev;
682 0 : unsigned int pipe = drm_crtc_index(crtc);
683 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
684 : int linedur_ns = 0, framedur_ns = 0;
685 0 : int dotclock = mode->crtc_clock;
686 :
687 0 : if (!dev->num_crtcs)
688 0 : return;
689 :
690 0 : if (WARN_ON(pipe >= dev->num_crtcs))
691 0 : return;
692 :
693 : /* Valid dotclock? */
694 0 : if (dotclock > 0) {
695 0 : int frame_size = mode->crtc_htotal * mode->crtc_vtotal;
696 :
697 : /*
698 : * Convert scanline length in pixels and video
699 : * dot clock to line duration and frame duration
700 : * in nanoseconds:
701 : */
702 0 : linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock);
703 0 : framedur_ns = div_u64((u64) frame_size * 1000000, dotclock);
704 :
705 : /*
706 : * Fields of interlaced scanout modes are only half a frame duration.
707 : */
708 0 : if (mode->flags & DRM_MODE_FLAG_INTERLACE)
709 0 : framedur_ns /= 2;
710 0 : } else
711 0 : DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n",
712 : crtc->base.id);
713 :
714 0 : vblank->linedur_ns = linedur_ns;
715 0 : vblank->framedur_ns = framedur_ns;
716 :
717 : DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n",
718 : crtc->base.id, mode->crtc_htotal,
719 : mode->crtc_vtotal, mode->crtc_vdisplay);
720 : DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n",
721 : crtc->base.id, dotclock, framedur_ns, linedur_ns);
722 0 : }
723 : EXPORT_SYMBOL(drm_calc_timestamping_constants);
724 :
725 : /**
726 : * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper
727 : * @dev: DRM device
728 : * @pipe: index of CRTC whose vblank timestamp to retrieve
729 : * @max_error: Desired maximum allowable error in timestamps (nanosecs)
730 : * On return contains true maximum error of timestamp
731 : * @vblank_time: Pointer to struct timeval which should receive the timestamp
732 : * @flags: Flags to pass to driver:
733 : * 0 = Default,
734 : * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
735 : * @mode: mode which defines the scanout timings
736 : *
737 : * Implements calculation of exact vblank timestamps from given drm_display_mode
738 : * timings and current video scanout position of a CRTC. This can be called from
739 : * within get_vblank_timestamp() implementation of a kms driver to implement the
740 : * actual timestamping.
741 : *
742 : * Should return timestamps conforming to the OML_sync_control OpenML
743 : * extension specification. The timestamp corresponds to the end of
744 : * the vblank interval, aka start of scanout of topmost-leftmost display
745 : * pixel in the following video frame.
746 : *
747 : * Requires support for optional dev->driver->get_scanout_position()
748 : * in kms driver, plus a bit of setup code to provide a drm_display_mode
749 : * that corresponds to the true scanout timing.
750 : *
751 : * The current implementation only handles standard video modes. It
752 : * returns as no operation if a doublescan or interlaced video mode is
753 : * active. Higher level code is expected to handle this.
754 : *
755 : * Returns:
756 : * Negative value on error, failure or if not supported in current
757 : * video mode:
758 : *
759 : * -EINVAL - Invalid CRTC.
760 : * -EAGAIN - Temporary unavailable, e.g., called before initial modeset.
761 : * -ENOTSUPP - Function not supported in current display mode.
762 : * -EIO - Failed, e.g., due to failed scanout position query.
763 : *
764 : * Returns or'ed positive status flags on success:
765 : *
766 : * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.
767 : * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.
768 : *
769 : */
770 0 : int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
771 : unsigned int pipe,
772 : int *max_error,
773 : struct timeval *vblank_time,
774 : unsigned flags,
775 : const struct drm_display_mode *mode)
776 : {
777 0 : struct timeval tv_etime;
778 0 : ktime_t stime, etime;
779 : unsigned int vbl_status;
780 : int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD;
781 0 : int vpos, hpos, i;
782 : int delta_ns, duration_ns;
783 :
784 0 : if (pipe >= dev->num_crtcs) {
785 0 : DRM_ERROR("Invalid crtc %u\n", pipe);
786 0 : return -EINVAL;
787 : }
788 :
789 : /* Scanout position query not supported? Should not happen. */
790 0 : if (!dev->driver->get_scanout_position) {
791 0 : DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
792 0 : return -EIO;
793 : }
794 :
795 : /* If mode timing undefined, just return as no-op:
796 : * Happens during initial modesetting of a crtc.
797 : */
798 0 : if (mode->crtc_clock == 0) {
799 : DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe);
800 0 : return -EAGAIN;
801 : }
802 :
803 : /* Get current scanout position with system timestamp.
804 : * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times
805 : * if single query takes longer than max_error nanoseconds.
806 : *
807 : * This guarantees a tight bound on maximum error if
808 : * code gets preempted or delayed for some reason.
809 : */
810 0 : for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) {
811 : /*
812 : * Get vertical and horizontal scanout position vpos, hpos,
813 : * and bounding timestamps stime, etime, pre/post query.
814 : */
815 0 : vbl_status = dev->driver->get_scanout_position(dev, pipe, flags,
816 : &vpos, &hpos,
817 : &stime, &etime,
818 : mode);
819 :
820 : /* Return as no-op if scanout query unsupported or failed. */
821 0 : if (!(vbl_status & DRM_SCANOUTPOS_VALID)) {
822 : DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n",
823 : pipe, vbl_status);
824 0 : return -EIO;
825 : }
826 :
827 : /* Compute uncertainty in timestamp of scanout position query. */
828 0 : duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime);
829 :
830 : /* Accept result with < max_error nsecs timing uncertainty. */
831 0 : if (duration_ns <= *max_error)
832 : break;
833 : }
834 :
835 : /* Noisy system timing? */
836 : if (i == DRM_TIMESTAMP_MAXRETRIES) {
837 : DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n",
838 : pipe, duration_ns/1000, *max_error/1000, i);
839 : }
840 :
841 : /* Return upper bound of timestamp precision error. */
842 0 : *max_error = duration_ns;
843 :
844 : /* Check if in vblank area:
845 : * vpos is >=0 in video scanout area, but negative
846 : * within vblank area, counting down the number of lines until
847 : * start of scanout.
848 : */
849 0 : if (vbl_status & DRM_SCANOUTPOS_IN_VBLANK)
850 0 : ret |= DRM_VBLANKTIME_IN_VBLANK;
851 :
852 : /* Convert scanout position into elapsed time at raw_time query
853 : * since start of scanout at first display scanline. delta_ns
854 : * can be negative if start of scanout hasn't happened yet.
855 : */
856 0 : delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos),
857 0 : mode->crtc_clock);
858 :
859 0 : if (!drm_timestamp_monotonic)
860 0 : etime = ktime_mono_to_real(etime);
861 :
862 : /* save this only for debugging purposes */
863 0 : tv_etime = ktime_to_timeval(etime);
864 : /* Subtract time delta from raw timestamp to get final
865 : * vblank_time timestamp for end of vblank.
866 : */
867 0 : if (delta_ns < 0)
868 0 : etime = ktime_add_ns(etime, -delta_ns);
869 : else
870 0 : etime = ktime_sub_ns(etime, delta_ns);
871 0 : *vblank_time = ktime_to_timeval(etime);
872 :
873 : DRM_DEBUG_VBL("crtc %u : v 0x%x p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",
874 : pipe, vbl_status, hpos, vpos,
875 : (long)tv_etime.tv_sec, (long)tv_etime.tv_usec,
876 : (long)vblank_time->tv_sec, (long)vblank_time->tv_usec,
877 : duration_ns/1000, i);
878 :
879 0 : return ret;
880 0 : }
881 : EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
882 :
883 0 : static struct timeval get_drm_timestamp(void)
884 : {
885 : ktime_t now;
886 :
887 0 : now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real();
888 : return ktime_to_timeval(now);
889 0 : }
890 :
891 : /**
892 : * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent
893 : * vblank interval
894 : * @dev: DRM device
895 : * @pipe: index of CRTC whose vblank timestamp to retrieve
896 : * @tvblank: Pointer to target struct timeval which should receive the timestamp
897 : * @flags: Flags to pass to driver:
898 : * 0 = Default,
899 : * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
900 : *
901 : * Fetches the system timestamp corresponding to the time of the most recent
902 : * vblank interval on specified CRTC. May call into kms-driver to
903 : * compute the timestamp with a high-precision GPU specific method.
904 : *
905 : * Returns zero if timestamp originates from uncorrected do_gettimeofday()
906 : * call, i.e., it isn't very precisely locked to the true vblank.
907 : *
908 : * Returns:
909 : * True if timestamp is considered to be very precise, false otherwise.
910 : */
911 : static bool
912 0 : drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
913 : struct timeval *tvblank, unsigned flags)
914 : {
915 : int ret;
916 :
917 : /* Define requested maximum error on timestamps (nanoseconds). */
918 0 : int max_error = (int) drm_timestamp_precision * 1000;
919 :
920 : /* Query driver if possible and precision timestamping enabled. */
921 0 : if (dev->driver->get_vblank_timestamp && (max_error > 0)) {
922 0 : ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error,
923 : tvblank, flags);
924 0 : if (ret > 0)
925 0 : return true;
926 : }
927 :
928 : /* GPU high precision timestamp query unsupported or failed.
929 : * Return current monotonic/gettimeofday timestamp as best estimate.
930 : */
931 0 : *tvblank = get_drm_timestamp();
932 :
933 0 : return false;
934 0 : }
935 :
936 : /**
937 : * drm_vblank_count - retrieve "cooked" vblank counter value
938 : * @dev: DRM device
939 : * @pipe: index of CRTC for which to retrieve the counter
940 : *
941 : * Fetches the "cooked" vblank count value that represents the number of
942 : * vblank events since the system was booted, including lost events due to
943 : * modesetting activity.
944 : *
945 : * This is the legacy version of drm_crtc_vblank_count().
946 : *
947 : * Returns:
948 : * The software vblank counter.
949 : */
950 0 : u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe)
951 : {
952 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
953 :
954 0 : if (WARN_ON(pipe >= dev->num_crtcs))
955 0 : return 0;
956 :
957 0 : return vblank->count;
958 0 : }
959 : EXPORT_SYMBOL(drm_vblank_count);
960 :
961 : /**
962 : * drm_crtc_vblank_count - retrieve "cooked" vblank counter value
963 : * @crtc: which counter to retrieve
964 : *
965 : * Fetches the "cooked" vblank count value that represents the number of
966 : * vblank events since the system was booted, including lost events due to
967 : * modesetting activity.
968 : *
969 : * This is the native KMS version of drm_vblank_count().
970 : *
971 : * Returns:
972 : * The software vblank counter.
973 : */
974 0 : u32 drm_crtc_vblank_count(struct drm_crtc *crtc)
975 : {
976 0 : return drm_vblank_count(crtc->dev, drm_crtc_index(crtc));
977 : }
978 : EXPORT_SYMBOL(drm_crtc_vblank_count);
979 :
980 : /**
981 : * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the
982 : * system timestamp corresponding to that vblank counter value.
983 : * @dev: DRM device
984 : * @pipe: index of CRTC whose counter to retrieve
985 : * @vblanktime: Pointer to struct timeval to receive the vblank timestamp.
986 : *
987 : * Fetches the "cooked" vblank count value that represents the number of
988 : * vblank events since the system was booted, including lost events due to
989 : * modesetting activity. Returns corresponding system timestamp of the time
990 : * of the vblank interval that corresponds to the current vblank counter value.
991 : *
992 : * This is the legacy version of drm_crtc_vblank_count_and_time().
993 : */
994 0 : u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe,
995 : struct timeval *vblanktime)
996 : {
997 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
998 : int count = DRM_TIMESTAMP_MAXRETRIES;
999 : u32 cur_vblank;
1000 :
1001 0 : if (WARN_ON(pipe >= dev->num_crtcs))
1002 0 : return 0;
1003 :
1004 : /*
1005 : * Vblank timestamps are read lockless. To ensure consistency the vblank
1006 : * counter is rechecked and ordering is ensured using memory barriers.
1007 : * This works like a seqlock. The write-side barriers are in store_vblank.
1008 : */
1009 0 : do {
1010 0 : cur_vblank = vblank->count;
1011 0 : smp_rmb();
1012 0 : *vblanktime = vblanktimestamp(dev, pipe, cur_vblank);
1013 0 : smp_rmb();
1014 0 : } while (cur_vblank != vblank->count && --count > 0);
1015 :
1016 0 : return cur_vblank;
1017 0 : }
1018 : EXPORT_SYMBOL(drm_vblank_count_and_time);
1019 :
1020 : /**
1021 : * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value
1022 : * and the system timestamp corresponding to that vblank counter value
1023 : * @crtc: which counter to retrieve
1024 : * @vblanktime: Pointer to struct timeval to receive the vblank timestamp.
1025 : *
1026 : * Fetches the "cooked" vblank count value that represents the number of
1027 : * vblank events since the system was booted, including lost events due to
1028 : * modesetting activity. Returns corresponding system timestamp of the time
1029 : * of the vblank interval that corresponds to the current vblank counter value.
1030 : *
1031 : * This is the native KMS version of drm_vblank_count_and_time().
1032 : */
1033 0 : u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
1034 : struct timeval *vblanktime)
1035 : {
1036 0 : return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc),
1037 : vblanktime);
1038 : }
1039 : EXPORT_SYMBOL(drm_crtc_vblank_count_and_time);
1040 :
1041 0 : static void send_vblank_event(struct drm_device *dev,
1042 : struct drm_pending_vblank_event *e,
1043 : unsigned long seq, struct timeval *now)
1044 : {
1045 0 : assert_spin_locked(&dev->event_lock);
1046 :
1047 0 : e->event.sequence = seq;
1048 0 : e->event.tv_sec = now->tv_sec;
1049 0 : e->event.tv_usec = now->tv_usec;
1050 :
1051 0 : list_add_tail(&e->base.link,
1052 0 : &e->base.file_priv->event_list);
1053 0 : wake_up_interruptible(&e->base.file_priv->event_wait);
1054 : #ifdef __OpenBSD__
1055 0 : selwakeup(&e->base.file_priv->rsel);
1056 : #endif
1057 0 : trace_drm_vblank_event_delivered(e->base.pid, e->pipe,
1058 0 : e->event.sequence);
1059 0 : }
1060 :
1061 : /**
1062 : * drm_arm_vblank_event - arm vblank event after pageflip
1063 : * @dev: DRM device
1064 : * @pipe: CRTC index
1065 : * @e: the event to prepare to send
1066 : *
1067 : * A lot of drivers need to generate vblank events for the very next vblank
1068 : * interrupt. For example when the page flip interrupt happens when the page
1069 : * flip gets armed, but not when it actually executes within the next vblank
1070 : * period. This helper function implements exactly the required vblank arming
1071 : * behaviour.
1072 : *
1073 : * Caller must hold event lock. Caller must also hold a vblank reference for
1074 : * the event @e, which will be dropped when the next vblank arrives.
1075 : *
1076 : * This is the legacy version of drm_crtc_arm_vblank_event().
1077 : */
1078 0 : void drm_arm_vblank_event(struct drm_device *dev, unsigned int pipe,
1079 : struct drm_pending_vblank_event *e)
1080 : {
1081 0 : assert_spin_locked(&dev->event_lock);
1082 :
1083 0 : e->pipe = pipe;
1084 0 : e->event.sequence = drm_vblank_count(dev, pipe);
1085 0 : list_add_tail(&e->base.link, &dev->vblank_event_list);
1086 0 : }
1087 : EXPORT_SYMBOL(drm_arm_vblank_event);
1088 :
1089 : /**
1090 : * drm_crtc_arm_vblank_event - arm vblank event after pageflip
1091 : * @crtc: the source CRTC of the vblank event
1092 : * @e: the event to send
1093 : *
1094 : * A lot of drivers need to generate vblank events for the very next vblank
1095 : * interrupt. For example when the page flip interrupt happens when the page
1096 : * flip gets armed, but not when it actually executes within the next vblank
1097 : * period. This helper function implements exactly the required vblank arming
1098 : * behaviour.
1099 : *
1100 : * Caller must hold event lock. Caller must also hold a vblank reference for
1101 : * the event @e, which will be dropped when the next vblank arrives.
1102 : *
1103 : * This is the native KMS version of drm_arm_vblank_event().
1104 : */
1105 0 : void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
1106 : struct drm_pending_vblank_event *e)
1107 : {
1108 0 : drm_arm_vblank_event(crtc->dev, drm_crtc_index(crtc), e);
1109 0 : }
1110 : EXPORT_SYMBOL(drm_crtc_arm_vblank_event);
1111 :
1112 : /**
1113 : * drm_send_vblank_event - helper to send vblank event after pageflip
1114 : * @dev: DRM device
1115 : * @pipe: CRTC index
1116 : * @e: the event to send
1117 : *
1118 : * Updates sequence # and timestamp on event, and sends it to userspace.
1119 : * Caller must hold event lock.
1120 : *
1121 : * This is the legacy version of drm_crtc_send_vblank_event().
1122 : */
1123 0 : void drm_send_vblank_event(struct drm_device *dev, unsigned int pipe,
1124 : struct drm_pending_vblank_event *e)
1125 : {
1126 0 : struct timeval now;
1127 : unsigned int seq;
1128 :
1129 0 : if (dev->num_crtcs > 0) {
1130 0 : seq = drm_vblank_count_and_time(dev, pipe, &now);
1131 0 : } else {
1132 : seq = 0;
1133 :
1134 0 : now = get_drm_timestamp();
1135 : }
1136 0 : e->pipe = pipe;
1137 0 : send_vblank_event(dev, e, seq, &now);
1138 0 : }
1139 : EXPORT_SYMBOL(drm_send_vblank_event);
1140 :
1141 : /**
1142 : * drm_crtc_send_vblank_event - helper to send vblank event after pageflip
1143 : * @crtc: the source CRTC of the vblank event
1144 : * @e: the event to send
1145 : *
1146 : * Updates sequence # and timestamp on event, and sends it to userspace.
1147 : * Caller must hold event lock.
1148 : *
1149 : * This is the native KMS version of drm_send_vblank_event().
1150 : */
1151 0 : void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
1152 : struct drm_pending_vblank_event *e)
1153 : {
1154 0 : drm_send_vblank_event(crtc->dev, drm_crtc_index(crtc), e);
1155 0 : }
1156 : EXPORT_SYMBOL(drm_crtc_send_vblank_event);
1157 :
1158 : /**
1159 : * drm_vblank_enable - enable the vblank interrupt on a CRTC
1160 : * @dev: DRM device
1161 : * @pipe: CRTC index
1162 : *
1163 : * Returns:
1164 : * Zero on success or a negative error code on failure.
1165 : */
1166 0 : static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe)
1167 : {
1168 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
1169 : int ret = 0;
1170 :
1171 0 : assert_spin_locked(&dev->vbl_lock);
1172 :
1173 0 : spin_lock(&dev->vblank_time_lock);
1174 :
1175 0 : if (!vblank->enabled) {
1176 : /*
1177 : * Enable vblank irqs under vblank_time_lock protection.
1178 : * All vblank count & timestamp updates are held off
1179 : * until we are done reinitializing master counter and
1180 : * timestamps. Filtercode in drm_handle_vblank() will
1181 : * prevent double-accounting of same vblank interval.
1182 : */
1183 0 : ret = dev->driver->enable_vblank(dev, pipe);
1184 : DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret);
1185 0 : if (ret)
1186 0 : atomic_dec(&vblank->refcount);
1187 : else {
1188 0 : vblank->enabled = true;
1189 0 : drm_update_vblank_count(dev, pipe, 0);
1190 : }
1191 : }
1192 :
1193 0 : spin_unlock(&dev->vblank_time_lock);
1194 :
1195 0 : return ret;
1196 : }
1197 :
1198 : /**
1199 : * drm_vblank_get - get a reference count on vblank events
1200 : * @dev: DRM device
1201 : * @pipe: index of CRTC to own
1202 : *
1203 : * Acquire a reference count on vblank events to avoid having them disabled
1204 : * while in use.
1205 : *
1206 : * This is the legacy version of drm_crtc_vblank_get().
1207 : *
1208 : * Returns:
1209 : * Zero on success or a negative error code on failure.
1210 : */
1211 0 : int drm_vblank_get(struct drm_device *dev, unsigned int pipe)
1212 : {
1213 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
1214 : unsigned long irqflags;
1215 : int ret = 0;
1216 :
1217 0 : if (!dev->num_crtcs)
1218 0 : return -EINVAL;
1219 :
1220 0 : if (WARN_ON(pipe >= dev->num_crtcs))
1221 0 : return -EINVAL;
1222 :
1223 0 : spin_lock_irqsave(&dev->vbl_lock, irqflags);
1224 : /* Going from 0->1 means we have to enable interrupts again */
1225 0 : if (atomic_add_return(1, &vblank->refcount) == 1) {
1226 0 : ret = drm_vblank_enable(dev, pipe);
1227 0 : } else {
1228 0 : if (!vblank->enabled) {
1229 0 : atomic_dec(&vblank->refcount);
1230 : ret = -EINVAL;
1231 0 : }
1232 : }
1233 0 : spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
1234 :
1235 0 : return ret;
1236 0 : }
1237 : EXPORT_SYMBOL(drm_vblank_get);
1238 :
1239 : /**
1240 : * drm_crtc_vblank_get - get a reference count on vblank events
1241 : * @crtc: which CRTC to own
1242 : *
1243 : * Acquire a reference count on vblank events to avoid having them disabled
1244 : * while in use.
1245 : *
1246 : * This is the native kms version of drm_vblank_get().
1247 : *
1248 : * Returns:
1249 : * Zero on success or a negative error code on failure.
1250 : */
1251 0 : int drm_crtc_vblank_get(struct drm_crtc *crtc)
1252 : {
1253 0 : return drm_vblank_get(crtc->dev, drm_crtc_index(crtc));
1254 : }
1255 : EXPORT_SYMBOL(drm_crtc_vblank_get);
1256 :
1257 : /**
1258 : * drm_vblank_put - release ownership of vblank events
1259 : * @dev: DRM device
1260 : * @pipe: index of CRTC to release
1261 : *
1262 : * Release ownership of a given vblank counter, turning off interrupts
1263 : * if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
1264 : *
1265 : * This is the legacy version of drm_crtc_vblank_put().
1266 : */
1267 0 : void drm_vblank_put(struct drm_device *dev, unsigned int pipe)
1268 : {
1269 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
1270 :
1271 0 : if (WARN_ON(pipe >= dev->num_crtcs))
1272 0 : return;
1273 :
1274 0 : if (WARN_ON(atomic_read(&vblank->refcount) == 0))
1275 0 : return;
1276 :
1277 : /* Last user schedules interrupt disable */
1278 0 : if (atomic_dec_and_test(&vblank->refcount)) {
1279 0 : if (drm_vblank_offdelay == 0)
1280 0 : return;
1281 0 : else if (drm_vblank_offdelay < 0)
1282 0 : vblank_disable_fn((unsigned long)vblank);
1283 0 : else if (!dev->vblank_disable_immediate)
1284 0 : mod_timer(&vblank->disable_timer,
1285 : jiffies + ((drm_vblank_offdelay * HZ)/1000));
1286 : }
1287 0 : }
1288 : EXPORT_SYMBOL(drm_vblank_put);
1289 :
1290 : /**
1291 : * drm_crtc_vblank_put - give up ownership of vblank events
1292 : * @crtc: which counter to give up
1293 : *
1294 : * Release ownership of a given vblank counter, turning off interrupts
1295 : * if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
1296 : *
1297 : * This is the native kms version of drm_vblank_put().
1298 : */
1299 0 : void drm_crtc_vblank_put(struct drm_crtc *crtc)
1300 : {
1301 0 : drm_vblank_put(crtc->dev, drm_crtc_index(crtc));
1302 0 : }
1303 : EXPORT_SYMBOL(drm_crtc_vblank_put);
1304 :
1305 : /**
1306 : * drm_wait_one_vblank - wait for one vblank
1307 : * @dev: DRM device
1308 : * @pipe: CRTC index
1309 : *
1310 : * This waits for one vblank to pass on @pipe, using the irq driver interfaces.
1311 : * It is a failure to call this when the vblank irq for @pipe is disabled, e.g.
1312 : * due to lack of driver support or because the crtc is off.
1313 : */
1314 0 : void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe)
1315 : {
1316 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
1317 : int ret;
1318 : u32 last;
1319 :
1320 0 : if (WARN_ON(pipe >= dev->num_crtcs))
1321 0 : return;
1322 :
1323 : #ifdef __OpenBSD__
1324 : /*
1325 : * If we're cold, vblank interrupts won't happen even if
1326 : * they're turned on by the driver. Just stall long enough
1327 : * for a vblank to pass. This assumes a vrefresh of at least
1328 : * 25 Hz.
1329 : */
1330 0 : if (cold) {
1331 0 : delay(40000);
1332 0 : return;
1333 : }
1334 : #endif
1335 :
1336 0 : ret = drm_vblank_get(dev, pipe);
1337 0 : if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret))
1338 0 : return;
1339 :
1340 0 : last = drm_vblank_count(dev, pipe);
1341 :
1342 0 : ret = wait_event_timeout(vblank->queue,
1343 : last != drm_vblank_count(dev, pipe),
1344 : msecs_to_jiffies(100));
1345 :
1346 0 : WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe);
1347 :
1348 0 : drm_vblank_put(dev, pipe);
1349 0 : }
1350 : EXPORT_SYMBOL(drm_wait_one_vblank);
1351 :
1352 : /**
1353 : * drm_crtc_wait_one_vblank - wait for one vblank
1354 : * @crtc: DRM crtc
1355 : *
1356 : * This waits for one vblank to pass on @crtc, using the irq driver interfaces.
1357 : * It is a failure to call this when the vblank irq for @crtc is disabled, e.g.
1358 : * due to lack of driver support or because the crtc is off.
1359 : */
1360 0 : void drm_crtc_wait_one_vblank(struct drm_crtc *crtc)
1361 : {
1362 0 : drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc));
1363 0 : }
1364 : EXPORT_SYMBOL(drm_crtc_wait_one_vblank);
1365 :
1366 : /**
1367 : * drm_vblank_off - disable vblank events on a CRTC
1368 : * @dev: DRM device
1369 : * @pipe: CRTC index
1370 : *
1371 : * Drivers can use this function to shut down the vblank interrupt handling when
1372 : * disabling a crtc. This function ensures that the latest vblank frame count is
1373 : * stored so that drm_vblank_on() can restore it again.
1374 : *
1375 : * Drivers must use this function when the hardware vblank counter can get
1376 : * reset, e.g. when suspending.
1377 : *
1378 : * This is the legacy version of drm_crtc_vblank_off().
1379 : */
1380 0 : void drm_vblank_off(struct drm_device *dev, unsigned int pipe)
1381 : {
1382 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
1383 : struct drm_pending_vblank_event *e, *t;
1384 0 : struct timeval now;
1385 : unsigned long irqflags;
1386 : unsigned int seq;
1387 :
1388 0 : if (WARN_ON(pipe >= dev->num_crtcs))
1389 0 : return;
1390 :
1391 0 : spin_lock_irqsave(&dev->event_lock, irqflags);
1392 :
1393 0 : spin_lock(&dev->vbl_lock);
1394 : DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n",
1395 : pipe, vblank->enabled, vblank->inmodeset);
1396 :
1397 : /* Avoid redundant vblank disables without previous drm_vblank_on(). */
1398 0 : if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset)
1399 0 : vblank_disable_and_save(dev, pipe);
1400 :
1401 0 : wake_up(&vblank->queue);
1402 :
1403 : /*
1404 : * Prevent subsequent drm_vblank_get() from re-enabling
1405 : * the vblank interrupt by bumping the refcount.
1406 : */
1407 0 : if (!vblank->inmodeset) {
1408 0 : atomic_inc(&vblank->refcount);
1409 0 : vblank->inmodeset = 1;
1410 0 : }
1411 0 : spin_unlock(&dev->vbl_lock);
1412 :
1413 : /* Send any queued vblank events, lest the natives grow disquiet */
1414 0 : seq = drm_vblank_count_and_time(dev, pipe, &now);
1415 :
1416 0 : list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
1417 0 : if (e->pipe != pipe)
1418 : continue;
1419 : DRM_DEBUG("Sending premature vblank event on disable: "
1420 : "wanted %d, current %d\n",
1421 : e->event.sequence, seq);
1422 0 : list_del(&e->base.link);
1423 0 : drm_vblank_put(dev, pipe);
1424 0 : send_vblank_event(dev, e, seq, &now);
1425 0 : }
1426 0 : spin_unlock_irqrestore(&dev->event_lock, irqflags);
1427 0 : }
1428 : EXPORT_SYMBOL(drm_vblank_off);
1429 :
1430 : /**
1431 : * drm_crtc_vblank_off - disable vblank events on a CRTC
1432 : * @crtc: CRTC in question
1433 : *
1434 : * Drivers can use this function to shut down the vblank interrupt handling when
1435 : * disabling a crtc. This function ensures that the latest vblank frame count is
1436 : * stored so that drm_vblank_on can restore it again.
1437 : *
1438 : * Drivers must use this function when the hardware vblank counter can get
1439 : * reset, e.g. when suspending.
1440 : *
1441 : * This is the native kms version of drm_vblank_off().
1442 : */
1443 0 : void drm_crtc_vblank_off(struct drm_crtc *crtc)
1444 : {
1445 0 : drm_vblank_off(crtc->dev, drm_crtc_index(crtc));
1446 0 : }
1447 : EXPORT_SYMBOL(drm_crtc_vblank_off);
1448 :
1449 : /**
1450 : * drm_crtc_vblank_reset - reset vblank state to off on a CRTC
1451 : * @crtc: CRTC in question
1452 : *
1453 : * Drivers can use this function to reset the vblank state to off at load time.
1454 : * Drivers should use this together with the drm_crtc_vblank_off() and
1455 : * drm_crtc_vblank_on() functions. The difference compared to
1456 : * drm_crtc_vblank_off() is that this function doesn't save the vblank counter
1457 : * and hence doesn't need to call any driver hooks.
1458 : */
1459 0 : void drm_crtc_vblank_reset(struct drm_crtc *crtc)
1460 : {
1461 0 : struct drm_device *dev = crtc->dev;
1462 : unsigned long irqflags;
1463 0 : unsigned int pipe = drm_crtc_index(crtc);
1464 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
1465 :
1466 0 : spin_lock_irqsave(&dev->vbl_lock, irqflags);
1467 : /*
1468 : * Prevent subsequent drm_vblank_get() from enabling the vblank
1469 : * interrupt by bumping the refcount.
1470 : */
1471 0 : if (!vblank->inmodeset) {
1472 0 : atomic_inc(&vblank->refcount);
1473 0 : vblank->inmodeset = 1;
1474 0 : }
1475 0 : spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
1476 :
1477 0 : WARN_ON(!list_empty(&dev->vblank_event_list));
1478 0 : }
1479 : EXPORT_SYMBOL(drm_crtc_vblank_reset);
1480 :
1481 : /**
1482 : * drm_vblank_on - enable vblank events on a CRTC
1483 : * @dev: DRM device
1484 : * @pipe: CRTC index
1485 : *
1486 : * This functions restores the vblank interrupt state captured with
1487 : * drm_vblank_off() again. Note that calls to drm_vblank_on() and
1488 : * drm_vblank_off() can be unbalanced and so can also be unconditionally called
1489 : * in driver load code to reflect the current hardware state of the crtc.
1490 : *
1491 : * This is the legacy version of drm_crtc_vblank_on().
1492 : */
1493 0 : void drm_vblank_on(struct drm_device *dev, unsigned int pipe)
1494 : {
1495 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
1496 : unsigned long irqflags;
1497 :
1498 0 : if (WARN_ON(pipe >= dev->num_crtcs))
1499 0 : return;
1500 :
1501 0 : spin_lock_irqsave(&dev->vbl_lock, irqflags);
1502 : DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n",
1503 : pipe, vblank->enabled, vblank->inmodeset);
1504 :
1505 : /* Drop our private "prevent drm_vblank_get" refcount */
1506 0 : if (vblank->inmodeset) {
1507 0 : atomic_dec(&vblank->refcount);
1508 0 : vblank->inmodeset = 0;
1509 0 : }
1510 :
1511 0 : drm_reset_vblank_timestamp(dev, pipe);
1512 :
1513 : /*
1514 : * re-enable interrupts if there are users left, or the
1515 : * user wishes vblank interrupts to be enabled all the time.
1516 : */
1517 0 : if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0)
1518 0 : WARN_ON(drm_vblank_enable(dev, pipe));
1519 0 : spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
1520 0 : }
1521 : EXPORT_SYMBOL(drm_vblank_on);
1522 :
1523 : /**
1524 : * drm_crtc_vblank_on - enable vblank events on a CRTC
1525 : * @crtc: CRTC in question
1526 : *
1527 : * This functions restores the vblank interrupt state captured with
1528 : * drm_vblank_off() again. Note that calls to drm_vblank_on() and
1529 : * drm_vblank_off() can be unbalanced and so can also be unconditionally called
1530 : * in driver load code to reflect the current hardware state of the crtc.
1531 : *
1532 : * This is the native kms version of drm_vblank_on().
1533 : */
1534 0 : void drm_crtc_vblank_on(struct drm_crtc *crtc)
1535 : {
1536 0 : drm_vblank_on(crtc->dev, drm_crtc_index(crtc));
1537 0 : }
1538 : EXPORT_SYMBOL(drm_crtc_vblank_on);
1539 :
1540 : /**
1541 : * drm_vblank_pre_modeset - account for vblanks across mode sets
1542 : * @dev: DRM device
1543 : * @pipe: CRTC index
1544 : *
1545 : * Account for vblank events across mode setting events, which will likely
1546 : * reset the hardware frame counter.
1547 : *
1548 : * This is done by grabbing a temporary vblank reference to ensure that the
1549 : * vblank interrupt keeps running across the modeset sequence. With this the
1550 : * software-side vblank frame counting will ensure that there are no jumps or
1551 : * discontinuities.
1552 : *
1553 : * Unfortunately this approach is racy and also doesn't work when the vblank
1554 : * interrupt stops running, e.g. across system suspend resume. It is therefore
1555 : * highly recommended that drivers use the newer drm_vblank_off() and
1556 : * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when
1557 : * using "cooked" software vblank frame counters and not relying on any hardware
1558 : * counters.
1559 : *
1560 : * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc
1561 : * again.
1562 : */
1563 0 : void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe)
1564 : {
1565 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
1566 :
1567 : /* vblank is not initialized (IRQ not installed ?), or has been freed */
1568 0 : if (!dev->num_crtcs)
1569 0 : return;
1570 :
1571 0 : if (WARN_ON(pipe >= dev->num_crtcs))
1572 0 : return;
1573 :
1574 : /*
1575 : * To avoid all the problems that might happen if interrupts
1576 : * were enabled/disabled around or between these calls, we just
1577 : * have the kernel take a reference on the CRTC (just once though
1578 : * to avoid corrupting the count if multiple, mismatch calls occur),
1579 : * so that interrupts remain enabled in the interim.
1580 : */
1581 0 : if (!vblank->inmodeset) {
1582 0 : vblank->inmodeset = 0x1;
1583 0 : if (drm_vblank_get(dev, pipe) == 0)
1584 0 : vblank->inmodeset |= 0x2;
1585 : }
1586 0 : }
1587 : EXPORT_SYMBOL(drm_vblank_pre_modeset);
1588 :
1589 : /**
1590 : * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes
1591 : * @dev: DRM device
1592 : * @pipe: CRTC index
1593 : *
1594 : * This function again drops the temporary vblank reference acquired in
1595 : * drm_vblank_pre_modeset.
1596 : */
1597 0 : void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe)
1598 : {
1599 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
1600 : unsigned long irqflags;
1601 :
1602 : /* vblank is not initialized (IRQ not installed ?), or has been freed */
1603 0 : if (!dev->num_crtcs)
1604 0 : return;
1605 :
1606 0 : if (WARN_ON(pipe >= dev->num_crtcs))
1607 0 : return;
1608 :
1609 0 : if (vblank->inmodeset) {
1610 0 : spin_lock_irqsave(&dev->vbl_lock, irqflags);
1611 0 : dev->vblank_disable_allowed = true;
1612 0 : drm_reset_vblank_timestamp(dev, pipe);
1613 0 : spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
1614 :
1615 0 : if (vblank->inmodeset & 0x2)
1616 0 : drm_vblank_put(dev, pipe);
1617 :
1618 0 : vblank->inmodeset = 0;
1619 0 : }
1620 0 : }
1621 : EXPORT_SYMBOL(drm_vblank_post_modeset);
1622 :
1623 : /*
1624 : * drm_modeset_ctl - handle vblank event counter changes across mode switch
1625 : * @DRM_IOCTL_ARGS: standard ioctl arguments
1626 : *
1627 : * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
1628 : * ioctls around modesetting so that any lost vblank events are accounted for.
1629 : *
1630 : * Generally the counter will reset across mode sets. If interrupts are
1631 : * enabled around this call, we don't have to do anything since the counter
1632 : * will have already been incremented.
1633 : */
1634 0 : int drm_modeset_ctl(struct drm_device *dev, void *data,
1635 : struct drm_file *file_priv)
1636 : {
1637 0 : struct drm_modeset_ctl *modeset = data;
1638 : unsigned int pipe;
1639 :
1640 : /* If drm_vblank_init() hasn't been called yet, just no-op */
1641 0 : if (!dev->num_crtcs)
1642 0 : return 0;
1643 :
1644 : /* KMS drivers handle this internally */
1645 0 : if (drm_core_check_feature(dev, DRIVER_MODESET))
1646 0 : return 0;
1647 :
1648 0 : pipe = modeset->crtc;
1649 0 : if (pipe >= dev->num_crtcs)
1650 0 : return -EINVAL;
1651 :
1652 0 : switch (modeset->cmd) {
1653 : case _DRM_PRE_MODESET:
1654 0 : drm_vblank_pre_modeset(dev, pipe);
1655 0 : break;
1656 : case _DRM_POST_MODESET:
1657 0 : drm_vblank_post_modeset(dev, pipe);
1658 0 : break;
1659 : default:
1660 0 : return -EINVAL;
1661 : }
1662 :
1663 0 : return 0;
1664 0 : }
1665 :
1666 0 : static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe,
1667 : union drm_wait_vblank *vblwait,
1668 : struct drm_file *file_priv)
1669 : {
1670 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
1671 : struct drm_pending_vblank_event *e;
1672 0 : struct timeval now;
1673 : unsigned long flags;
1674 : unsigned int seq;
1675 : int ret;
1676 :
1677 0 : e = kzalloc(sizeof(*e), GFP_KERNEL);
1678 0 : if (e == NULL) {
1679 : ret = -ENOMEM;
1680 0 : goto err_put;
1681 : }
1682 :
1683 0 : e->pipe = pipe;
1684 : #ifdef __linux__
1685 : e->base.pid = current->pid;
1686 : #else
1687 0 : e->base.pid = curproc->p_p->ps_pid;
1688 : #endif
1689 0 : e->event.base.type = DRM_EVENT_VBLANK;
1690 0 : e->event.base.length = sizeof(e->event);
1691 0 : e->event.user_data = vblwait->request.signal;
1692 0 : e->base.event = &e->event.base;
1693 0 : e->base.file_priv = file_priv;
1694 0 : e->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
1695 :
1696 0 : spin_lock_irqsave(&dev->event_lock, flags);
1697 :
1698 : /*
1699 : * drm_vblank_off() might have been called after we called
1700 : * drm_vblank_get(). drm_vblank_off() holds event_lock
1701 : * around the vblank disable, so no need for further locking.
1702 : * The reference from drm_vblank_get() protects against
1703 : * vblank disable from another source.
1704 : */
1705 0 : if (!vblank->enabled) {
1706 : ret = -EINVAL;
1707 0 : goto err_unlock;
1708 : }
1709 :
1710 0 : if (file_priv->event_space < sizeof(e->event)) {
1711 : ret = -EBUSY;
1712 0 : goto err_unlock;
1713 : }
1714 :
1715 0 : file_priv->event_space -= sizeof(e->event);
1716 0 : seq = drm_vblank_count_and_time(dev, pipe, &now);
1717 :
1718 0 : if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) &&
1719 0 : (seq - vblwait->request.sequence) <= (1 << 23)) {
1720 0 : vblwait->request.sequence = seq + 1;
1721 0 : vblwait->reply.sequence = vblwait->request.sequence;
1722 0 : }
1723 :
1724 : DRM_DEBUG("event on vblank count %d, current %d, crtc %u\n",
1725 : vblwait->request.sequence, seq, pipe);
1726 :
1727 : #ifdef __linux__
1728 : trace_drm_vblank_event_queued(current->pid, pipe,
1729 : vblwait->request.sequence);
1730 : #else
1731 0 : trace_drm_vblank_event_queued(curproc->p_p->ps_pid, pipe,
1732 0 : vblwait->request.sequence);
1733 : #endif
1734 :
1735 0 : e->event.sequence = vblwait->request.sequence;
1736 0 : if ((seq - vblwait->request.sequence) <= (1 << 23)) {
1737 0 : drm_vblank_put(dev, pipe);
1738 0 : send_vblank_event(dev, e, seq, &now);
1739 0 : vblwait->reply.sequence = seq;
1740 0 : } else {
1741 : /* drm_handle_vblank_events will call drm_vblank_put */
1742 0 : list_add_tail(&e->base.link, &dev->vblank_event_list);
1743 0 : vblwait->reply.sequence = vblwait->request.sequence;
1744 : }
1745 :
1746 0 : spin_unlock_irqrestore(&dev->event_lock, flags);
1747 :
1748 0 : return 0;
1749 :
1750 : err_unlock:
1751 0 : spin_unlock_irqrestore(&dev->event_lock, flags);
1752 0 : kfree(e);
1753 : err_put:
1754 0 : drm_vblank_put(dev, pipe);
1755 0 : return ret;
1756 0 : }
1757 :
1758 : /*
1759 : * Wait for VBLANK.
1760 : *
1761 : * \param inode device inode.
1762 : * \param file_priv DRM file private.
1763 : * \param cmd command.
1764 : * \param data user argument, pointing to a drm_wait_vblank structure.
1765 : * \return zero on success or a negative number on failure.
1766 : *
1767 : * This function enables the vblank interrupt on the pipe requested, then
1768 : * sleeps waiting for the requested sequence number to occur, and drops
1769 : * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that
1770 : * after a timeout with no further vblank waits scheduled).
1771 : */
1772 0 : int drm_wait_vblank(struct drm_device *dev, void *data,
1773 : struct drm_file *file_priv)
1774 : {
1775 : struct drm_vblank_crtc *vblank;
1776 0 : union drm_wait_vblank *vblwait = data;
1777 : int ret;
1778 : unsigned int flags, seq, pipe, high_pipe;
1779 :
1780 0 : if (!dev->irq_enabled)
1781 0 : return -EINVAL;
1782 :
1783 0 : if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
1784 0 : return -EINVAL;
1785 :
1786 0 : if (vblwait->request.type &
1787 : ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
1788 : _DRM_VBLANK_HIGH_CRTC_MASK)) {
1789 0 : DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
1790 : vblwait->request.type,
1791 : (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
1792 : _DRM_VBLANK_HIGH_CRTC_MASK));
1793 0 : return -EINVAL;
1794 : }
1795 :
1796 0 : flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
1797 0 : high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK);
1798 0 : if (high_pipe)
1799 0 : pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT;
1800 : else
1801 0 : pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
1802 0 : if (pipe >= dev->num_crtcs)
1803 0 : return -EINVAL;
1804 :
1805 0 : vblank = &dev->vblank[pipe];
1806 :
1807 0 : ret = drm_vblank_get(dev, pipe);
1808 0 : if (ret) {
1809 : DRM_DEBUG("failed to acquire vblank counter, %d\n", ret);
1810 0 : return ret;
1811 : }
1812 0 : seq = drm_vblank_count(dev, pipe);
1813 :
1814 0 : switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
1815 : case _DRM_VBLANK_RELATIVE:
1816 0 : vblwait->request.sequence += seq;
1817 0 : vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
1818 : case _DRM_VBLANK_ABSOLUTE:
1819 : break;
1820 : default:
1821 : ret = -EINVAL;
1822 : goto done;
1823 : }
1824 :
1825 0 : if (flags & _DRM_VBLANK_EVENT) {
1826 : /* must hold on to the vblank ref until the event fires
1827 : * drm_vblank_put will be called asynchronously
1828 : */
1829 0 : return drm_queue_vblank_event(dev, pipe, vblwait, file_priv);
1830 : }
1831 :
1832 0 : if ((flags & _DRM_VBLANK_NEXTONMISS) &&
1833 0 : (seq - vblwait->request.sequence) <= (1<<23)) {
1834 0 : vblwait->request.sequence = seq + 1;
1835 0 : }
1836 :
1837 : DRM_DEBUG("waiting on vblank count %d, crtc %u\n",
1838 : vblwait->request.sequence, pipe);
1839 0 : vblank->last_wait = vblwait->request.sequence;
1840 0 : DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
1841 : (((drm_vblank_count(dev, pipe) -
1842 : vblwait->request.sequence) <= (1 << 23)) ||
1843 : !vblank->enabled ||
1844 : !dev->irq_enabled));
1845 :
1846 0 : if (ret != -EINTR) {
1847 0 : struct timeval now;
1848 :
1849 0 : vblwait->reply.sequence = drm_vblank_count_and_time(dev, pipe, &now);
1850 0 : vblwait->reply.tval_sec = now.tv_sec;
1851 0 : vblwait->reply.tval_usec = now.tv_usec;
1852 :
1853 : DRM_DEBUG("returning %d to client\n",
1854 : vblwait->reply.sequence);
1855 0 : } else {
1856 : DRM_DEBUG("vblank wait interrupted by signal\n");
1857 : }
1858 :
1859 : done:
1860 0 : drm_vblank_put(dev, pipe);
1861 0 : return ret;
1862 0 : }
1863 :
1864 0 : static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe)
1865 : {
1866 : struct drm_pending_vblank_event *e, *t;
1867 0 : struct timeval now;
1868 : unsigned int seq;
1869 :
1870 0 : assert_spin_locked(&dev->event_lock);
1871 :
1872 0 : seq = drm_vblank_count_and_time(dev, pipe, &now);
1873 :
1874 0 : list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
1875 0 : if (e->pipe != pipe)
1876 : continue;
1877 0 : if ((seq - e->event.sequence) > (1<<23))
1878 : continue;
1879 :
1880 : DRM_DEBUG("vblank event on %d, current %d\n",
1881 : e->event.sequence, seq);
1882 :
1883 0 : list_del(&e->base.link);
1884 0 : drm_vblank_put(dev, pipe);
1885 0 : send_vblank_event(dev, e, seq, &now);
1886 0 : }
1887 :
1888 0 : trace_drm_vblank_event(pipe, seq);
1889 0 : }
1890 :
1891 : /**
1892 : * drm_handle_vblank - handle a vblank event
1893 : * @dev: DRM device
1894 : * @pipe: index of CRTC where this event occurred
1895 : *
1896 : * Drivers should call this routine in their vblank interrupt handlers to
1897 : * update the vblank counter and send any signals that may be pending.
1898 : *
1899 : * This is the legacy version of drm_crtc_handle_vblank().
1900 : */
1901 0 : bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe)
1902 : {
1903 0 : struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
1904 : unsigned long irqflags;
1905 :
1906 0 : if (WARN_ON_ONCE(!dev->num_crtcs))
1907 0 : return false;
1908 :
1909 0 : if (WARN_ON(pipe >= dev->num_crtcs))
1910 0 : return false;
1911 :
1912 0 : spin_lock_irqsave(&dev->event_lock, irqflags);
1913 :
1914 : /* Need timestamp lock to prevent concurrent execution with
1915 : * vblank enable/disable, as this would cause inconsistent
1916 : * or corrupted timestamps and vblank counts.
1917 : */
1918 0 : spin_lock(&dev->vblank_time_lock);
1919 :
1920 : /* Vblank irq handling disabled. Nothing to do. */
1921 0 : if (!vblank->enabled) {
1922 0 : spin_unlock(&dev->vblank_time_lock);
1923 0 : spin_unlock_irqrestore(&dev->event_lock, irqflags);
1924 0 : return false;
1925 : }
1926 :
1927 0 : drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ);
1928 :
1929 0 : spin_unlock(&dev->vblank_time_lock);
1930 :
1931 0 : wake_up(&vblank->queue);
1932 0 : drm_handle_vblank_events(dev, pipe);
1933 :
1934 : /* With instant-off, we defer disabling the interrupt until after
1935 : * we finish processing the following vblank. The disable has to
1936 : * be last (after drm_handle_vblank_events) so that the timestamp
1937 : * is always accurate.
1938 : */
1939 0 : if (dev->vblank_disable_immediate &&
1940 0 : drm_vblank_offdelay > 0 &&
1941 0 : !atomic_read(&vblank->refcount))
1942 0 : vblank_disable_fn((unsigned long)vblank);
1943 :
1944 0 : spin_unlock_irqrestore(&dev->event_lock, irqflags);
1945 :
1946 0 : return true;
1947 0 : }
1948 : EXPORT_SYMBOL(drm_handle_vblank);
1949 :
1950 : /**
1951 : * drm_crtc_handle_vblank - handle a vblank event
1952 : * @crtc: where this event occurred
1953 : *
1954 : * Drivers should call this routine in their vblank interrupt handlers to
1955 : * update the vblank counter and send any signals that may be pending.
1956 : *
1957 : * This is the native KMS version of drm_handle_vblank().
1958 : *
1959 : * Returns:
1960 : * True if the event was successfully handled, false on failure.
1961 : */
1962 0 : bool drm_crtc_handle_vblank(struct drm_crtc *crtc)
1963 : {
1964 0 : return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc));
1965 : }
1966 : EXPORT_SYMBOL(drm_crtc_handle_vblank);
1967 :
1968 : /**
1969 : * drm_vblank_no_hw_counter - "No hw counter" implementation of .get_vblank_counter()
1970 : * @dev: DRM device
1971 : * @pipe: CRTC for which to read the counter
1972 : *
1973 : * Drivers can plug this into the .get_vblank_counter() function if
1974 : * there is no useable hardware frame counter available.
1975 : *
1976 : * Returns:
1977 : * 0
1978 : */
1979 0 : u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe)
1980 : {
1981 0 : return 0;
1982 : }
1983 : EXPORT_SYMBOL(drm_vblank_no_hw_counter);
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