aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/drm_irq.c
blob: 1608f8dbfda062c9cda16ce26dfff650985ed947 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
/**
 * \file drm_irq.c
 * IRQ support
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
 *
 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include "drmP.h"

#include <linux/interrupt.h>	/* For task queue support */

/**
 * Get interrupt from bus id.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_irq_busid structure.
 * \return zero on success or a negative number on failure.
 *
 * Finds the PCI device with the specified bus id and gets its IRQ number.
 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
 * to that of the device that this DRM instance attached to.
 */
int drm_irq_by_busid(struct drm_device *dev, void *data,
		     struct drm_file *file_priv)
{
	struct drm_irq_busid *p = data;

	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
		return -EINVAL;

	if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
	    (p->busnum & 0xff) != dev->pdev->bus->number ||
	    p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
		return -EINVAL;

	p->irq = dev->pdev->irq;

	DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
		  p->irq);

	return 0;
}

static void vblank_disable_fn(unsigned long arg)
{
	struct drm_device *dev = (struct drm_device *)arg;
	unsigned long irqflags;
	int i;

	if (!dev->vblank_disable_allowed)
		return;

	for (i = 0; i < dev->num_crtcs; i++) {
		spin_lock_irqsave(&dev->vbl_lock, irqflags);
		if (atomic_read(&dev->vblank_refcount[i]) == 0 &&
		    dev->vblank_enabled[i]) {
			DRM_DEBUG("disabling vblank on crtc %d\n", i);
			dev->last_vblank[i] =
				dev->driver->get_vblank_counter(dev, i);
			dev->driver->disable_vblank(dev, i);
			dev->vblank_enabled[i] = 0;
		}
		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
	}
}

void drm_vblank_cleanup(struct drm_device *dev)
{
	/* Bail if the driver didn't call drm_vblank_init() */
	if (dev->num_crtcs == 0)
		return;

	del_timer(&dev->vblank_disable_timer);

	vblank_disable_fn((unsigned long)dev);

	drm_free(dev->vbl_queue, sizeof(*dev->vbl_queue) * dev->num_crtcs,
		 DRM_MEM_DRIVER);
	drm_free(dev->vbl_sigs, sizeof(*dev->vbl_sigs) * dev->num_crtcs,
		 DRM_MEM_DRIVER);
	drm_free(dev->_vblank_count, sizeof(*dev->_vblank_count) *
		 dev->num_crtcs, DRM_MEM_DRIVER);
	drm_free(dev->vblank_refcount, sizeof(*dev->vblank_refcount) *
		 dev->num_crtcs, DRM_MEM_DRIVER);
	drm_free(dev->vblank_enabled, sizeof(*dev->vblank_enabled) *
		 dev->num_crtcs, DRM_MEM_DRIVER);
	drm_free(dev->last_vblank, sizeof(*dev->last_vblank) * dev->num_crtcs,
		 DRM_MEM_DRIVER);
	drm_free(dev->vblank_inmodeset, sizeof(*dev->vblank_inmodeset) *
		 dev->num_crtcs, DRM_MEM_DRIVER);

	dev->num_crtcs = 0;
}

int drm_vblank_init(struct drm_device *dev, int num_crtcs)
{
	int i, ret = -ENOMEM;

	setup_timer(&dev->vblank_disable_timer, vblank_disable_fn,
		    (unsigned long)dev);
	spin_lock_init(&dev->vbl_lock);
	atomic_set(&dev->vbl_signal_pending, 0);
	dev->num_crtcs = num_crtcs;

	dev->vbl_queue = drm_alloc(sizeof(wait_queue_head_t) * num_crtcs,
				   DRM_MEM_DRIVER);
	if (!dev->vbl_queue)
		goto err;

	dev->vbl_sigs = drm_alloc(sizeof(struct list_head) * num_crtcs,
				  DRM_MEM_DRIVER);
	if (!dev->vbl_sigs)
		goto err;

	dev->_vblank_count = drm_alloc(sizeof(atomic_t) * num_crtcs,
				      DRM_MEM_DRIVER);
	if (!dev->_vblank_count)
		goto err;

	dev->vblank_refcount = drm_alloc(sizeof(atomic_t) * num_crtcs,
					 DRM_MEM_DRIVER);
	if (!dev->vblank_refcount)
		goto err;

	dev->vblank_enabled = drm_calloc(num_crtcs, sizeof(int),
					 DRM_MEM_DRIVER);
	if (!dev->vblank_enabled)
		goto err;

	dev->last_vblank = drm_calloc(num_crtcs, sizeof(u32), DRM_MEM_DRIVER);
	if (!dev->last_vblank)
		goto err;

	dev->vblank_inmodeset = drm_calloc(num_crtcs, sizeof(int),
					 DRM_MEM_DRIVER);
	if (!dev->vblank_inmodeset)
		goto err;

	/* Zero per-crtc vblank stuff */
	for (i = 0; i < num_crtcs; i++) {
		init_waitqueue_head(&dev->vbl_queue[i]);
		INIT_LIST_HEAD(&dev->vbl_sigs[i]);
		atomic_set(&dev->_vblank_count[i], 0);
		atomic_set(&dev->vblank_refcount[i], 0);
	}

	dev->vblank_disable_allowed = 0;

	return 0;

err:
	drm_vblank_cleanup(dev);
	return ret;
}
EXPORT_SYMBOL(drm_vblank_init);

/**
 * Install IRQ handler.
 *
 * \param dev DRM device.
 *
 * Initializes the IRQ related data. Installs the handler, calling the driver
 * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
 * before and after the installation.
 */
int drm_irq_install(struct drm_device *dev)
{
	int ret = 0;
	unsigned long sh_flags = 0;

	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
		return -EINVAL;

	if (dev->pdev->irq == 0)
		return -EINVAL;

	mutex_lock(&dev->struct_mutex);

	/* Driver must have been initialized */
	if (!dev->dev_private) {
		mutex_unlock(&dev->struct_mutex);
		return -EINVAL;
	}

	if (dev->irq_enabled) {
		mutex_unlock(&dev->struct_mutex);
		return -EBUSY;
	}
	dev->irq_enabled = 1;
	mutex_unlock(&dev->struct_mutex);

	DRM_DEBUG("irq=%d\n", dev->pdev->irq);

	/* Before installing handler */
	dev->driver->irq_preinstall(dev);

	/* Install handler */
	if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
		sh_flags = IRQF_SHARED;

	ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler,
			  sh_flags, dev->devname, dev);

	if (ret < 0) {
		mutex_lock(&dev->struct_mutex);
		dev->irq_enabled = 0;
		mutex_unlock(&dev->struct_mutex);
		return ret;
	}

	/* After installing handler */
	ret = dev->driver->irq_postinstall(dev);
	if (ret < 0) {
		mutex_lock(&dev->struct_mutex);
		dev->irq_enabled = 0;
		mutex_unlock(&dev->struct_mutex);
	}

	return ret;
}
EXPORT_SYMBOL(drm_irq_install);

/**
 * Uninstall the IRQ handler.
 *
 * \param dev DRM device.
 *
 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
 */
int drm_irq_uninstall(struct drm_device * dev)
{
	int irq_enabled;

	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
		return -EINVAL;

	mutex_lock(&dev->struct_mutex);
	irq_enabled = dev->irq_enabled;
	dev->irq_enabled = 0;
	mutex_unlock(&dev->struct_mutex);

	if (!irq_enabled)
		return -EINVAL;

	DRM_DEBUG("irq=%d\n", dev->pdev->irq);

	dev->driver->irq_uninstall(dev);

	free_irq(dev->pdev->irq, dev);

	return 0;
}
EXPORT_SYMBOL(drm_irq_uninstall);

/**
 * IRQ control ioctl.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_control structure.
 * \return zero on success or a negative number on failure.
 *
 * Calls irq_install() or irq_uninstall() according to \p arg.
 */
int drm_control(struct drm_device *dev, void *data,
		struct drm_file *file_priv)
{
	struct drm_control *ctl = data;

	/* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */


	switch (ctl->func) {
	case DRM_INST_HANDLER:
		if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
			return 0;
		if (drm_core_check_feature(dev, DRIVER_MODESET))
			return 0;
		if (dev->if_version < DRM_IF_VERSION(1, 2) &&
		    ctl->irq != dev->pdev->irq)
			return -EINVAL;
		return drm_irq_install(dev);
	case DRM_UNINST_HANDLER:
		if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
			return 0;
		if (drm_core_check_feature(dev, DRIVER_MODESET))
			return 0;
		return drm_irq_uninstall(dev);
	default:
		return -EINVAL;
	}
}

/**
 * drm_vblank_count - retrieve "cooked" vblank counter value
 * @dev: DRM device
 * @crtc: which counter to retrieve
 *
 * Fetches the "cooked" vblank count value that represents the number of
 * vblank events since the system was booted, including lost events due to
 * modesetting activity.
 */
u32 drm_vblank_count(struct drm_device *dev, int crtc)
{
	return atomic_read(&dev->_vblank_count[crtc]);
}
EXPORT_SYMBOL(drm_vblank_count);

/**
 * drm_update_vblank_count - update the master vblank counter
 * @dev: DRM device
 * @crtc: counter to update
 *
 * Call back into the driver to update the appropriate vblank counter
 * (specified by @crtc).  Deal with wraparound, if it occurred, and
 * update the last read value so we can deal with wraparound on the next
 * call if necessary.
 *
 * Only necessary when going from off->on, to account for frames we
 * didn't get an interrupt for.
 *
 * Note: caller must hold dev->vbl_lock since this reads & writes
 * device vblank fields.
 */
static void drm_update_vblank_count(struct drm_device *dev, int crtc)
{
	u32 cur_vblank, diff;

	/*
	 * Interrupts were disabled prior to this call, so deal with counter
	 * wrap if needed.
	 * NOTE!  It's possible we lost a full dev->max_vblank_count events
	 * here if the register is small or we had vblank interrupts off for
	 * a long time.
	 */
	cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
	diff = cur_vblank - dev->last_vblank[crtc];
	if (cur_vblank < dev->last_vblank[crtc]) {
		diff += dev->max_vblank_count;

		DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
			  crtc, dev->last_vblank[crtc], cur_vblank, diff);
	}

	DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
		  crtc, diff);

	atomic_add(diff, &dev->_vblank_count[crtc]);
}

/**
 * drm_vblank_get - get a reference count on vblank events
 * @dev: DRM device
 * @crtc: which CRTC to own
 *
 * Acquire a reference count on vblank events to avoid having them disabled
 * while in use.
 *
 * RETURNS
 * Zero on success, nonzero on failure.
 */
int drm_vblank_get(struct drm_device *dev, int crtc)
{
	unsigned long irqflags;
	int ret = 0;

	spin_lock_irqsave(&dev->vbl_lock, irqflags);
	/* Going from 0->1 means we have to enable interrupts again */
	if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1 &&
	    !dev->vblank_enabled[crtc]) {
		ret = dev->driver->enable_vblank(dev, crtc);
		DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret);
		if (ret)
			atomic_dec(&dev->vblank_refcount[crtc]);
		else {
			dev->vblank_enabled[crtc] = 1;
			drm_update_vblank_count(dev, crtc);
		}
	}
	spin_unlock_irqrestore(&dev->vbl_lock, irqflags);

	return ret;
}
EXPORT_SYMBOL(drm_vblank_get);

/**
 * drm_vblank_put - give up ownership of vblank events
 * @dev: DRM device
 * @crtc: which counter to give up
 *
 * Release ownership of a given vblank counter, turning off interrupts
 * if possible.
 */
void drm_vblank_put(struct drm_device *dev, int crtc)
{
	/* Last user schedules interrupt disable */
	if (atomic_dec_and_test(&dev->vblank_refcount[crtc]))
		mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ);
}
EXPORT_SYMBOL(drm_vblank_put);

/**
 * drm_vblank_pre_modeset - account for vblanks across mode sets
 * @dev: DRM device
 * @crtc: CRTC in question
 * @post: post or pre mode set?
 *
 * Account for vblank events across mode setting events, which will likely
 * reset the hardware frame counter.
 */
void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
{
	/*
	 * To avoid all the problems that might happen if interrupts
	 * were enabled/disabled around or between these calls, we just
	 * have the kernel take a reference on the CRTC (just once though
	 * to avoid corrupting the count if multiple, mismatch calls occur),
	 * so that interrupts remain enabled in the interim.
	 */
	if (!dev->vblank_inmodeset[crtc]) {
		dev->vblank_inmodeset[crtc] = 1;
		drm_vblank_get(dev, crtc);
	}
}
EXPORT_SYMBOL(drm_vblank_pre_modeset);

void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
{
	unsigned long irqflags;

	if (dev->vblank_inmodeset[crtc]) {
		spin_lock_irqsave(&dev->vbl_lock, irqflags);
		dev->vblank_disable_allowed = 1;
		dev->vblank_inmodeset[crtc] = 0;
		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
		drm_vblank_put(dev, crtc);
	}
}
EXPORT_SYMBOL(drm_vblank_post_modeset);

/**
 * drm_modeset_ctl - handle vblank event counter changes across mode switch
 * @DRM_IOCTL_ARGS: standard ioctl arguments
 *
 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
 * ioctls around modesetting so that any lost vblank events are accounted for.
 *
 * Generally the counter will reset across mode sets.  If interrupts are
 * enabled around this call, we don't have to do anything since the counter
 * will have already been incremented.
 */
int drm_modeset_ctl(struct drm_device *dev, void *data,
		    struct drm_file *file_priv)
{
	struct drm_modeset_ctl *modeset = data;
	int crtc, ret = 0;

	/* If drm_vblank_init() hasn't been called yet, just no-op */
	if (!dev->num_crtcs)
		goto out;

	crtc = modeset->crtc;
	if (crtc >= dev->num_crtcs) {
		ret = -EINVAL;
		goto out;
	}

	switch (modeset->cmd) {
	case _DRM_PRE_MODESET:
		drm_vblank_pre_modeset(dev, crtc);
		break;
	case _DRM_POST_MODESET:
		drm_vblank_post_modeset(dev, crtc);
		break;
	default:
		ret = -EINVAL;
		break;
	}

out:
	return ret;
}

/**
 * Wait for VBLANK.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param data user argument, pointing to a drm_wait_vblank structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the IRQ is installed.
 *
 * If a signal is requested checks if this task has already scheduled the same signal
 * for the same vblank sequence number - nothing to be done in
 * that case. If the number of tasks waiting for the interrupt exceeds 100 the
 * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
 * task.
 *
 * If a signal is not requested, then calls vblank_wait().
 */
int drm_wait_vblank(struct drm_device *dev, void *data,
		    struct drm_file *file_priv)
{
	union drm_wait_vblank *vblwait = data;
	int ret = 0;
	unsigned int flags, seq, crtc;

	if ((!dev->pdev->irq) || (!dev->irq_enabled))
		return -EINVAL;

	if (vblwait->request.type &
	    ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
		DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
			  vblwait->request.type,
			  (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
		return -EINVAL;
	}

	flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
	crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;

	if (crtc >= dev->num_crtcs)
		return -EINVAL;

	ret = drm_vblank_get(dev, crtc);
	if (ret) {
		DRM_ERROR("failed to acquire vblank counter, %d\n", ret);
		return ret;
	}
	seq = drm_vblank_count(dev, crtc);

	switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
	case _DRM_VBLANK_RELATIVE:
		vblwait->request.sequence += seq;
		vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
	case _DRM_VBLANK_ABSOLUTE:
		break;
	default:
		ret = -EINVAL;
		goto done;
	}

	if ((flags & _DRM_VBLANK_NEXTONMISS) &&
	    (seq - vblwait->request.sequence) <= (1<<23)) {
		vblwait->request.sequence = seq + 1;
	}

	if (flags & _DRM_VBLANK_SIGNAL) {
		unsigned long irqflags;
		struct list_head *vbl_sigs = &dev->vbl_sigs[crtc];
		struct drm_vbl_sig *vbl_sig;

		spin_lock_irqsave(&dev->vbl_lock, irqflags);

		/* Check if this task has already scheduled the same signal
		 * for the same vblank sequence number; nothing to be done in
		 * that case
		 */
		list_for_each_entry(vbl_sig, vbl_sigs, head) {
			if (vbl_sig->sequence == vblwait->request.sequence
			    && vbl_sig->info.si_signo ==
			    vblwait->request.signal
			    && vbl_sig->task == current) {
				spin_unlock_irqrestore(&dev->vbl_lock,
						       irqflags);
				vblwait->reply.sequence = seq;
				goto done;
			}
		}

		if (atomic_read(&dev->vbl_signal_pending) >= 100) {
			spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
			ret = -EBUSY;
			goto done;
		}

		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);

		vbl_sig = drm_calloc(1, sizeof(struct drm_vbl_sig),
				     DRM_MEM_DRIVER);
		if (!vbl_sig) {
			ret = -ENOMEM;
			goto done;
		}

		/* Get a refcount on the vblank, which will be released by
		 * drm_vbl_send_signals().
		 */
		ret = drm_vblank_get(dev, crtc);
		if (ret) {
			drm_free(vbl_sig, sizeof(struct drm_vbl_sig),
				 DRM_MEM_DRIVER);
			goto done;
		}

		atomic_inc(&dev->vbl_signal_pending);

		vbl_sig->sequence = vblwait->request.sequence;
		vbl_sig->info.si_signo = vblwait->request.signal;
		vbl_sig->task = current;

		spin_lock_irqsave(&dev->vbl_lock, irqflags);

		list_add_tail(&vbl_sig->head, vbl_sigs);

		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);

		vblwait->reply.sequence = seq;
	} else {
		DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
			  vblwait->request.sequence, crtc);
		DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
			    ((drm_vblank_count(dev, crtc)
			      - vblwait->request.sequence) <= (1 << 23)));

		if (ret != -EINTR) {
			struct timeval now;

			do_gettimeofday(&now);

			vblwait->reply.tval_sec = now.tv_sec;
			vblwait->reply.tval_usec = now.tv_usec;
			vblwait->reply.sequence = drm_vblank_count(dev, crtc);
			DRM_DEBUG("returning %d to client\n",
				  vblwait->reply.sequence);
		} else {
			DRM_DEBUG("vblank wait interrupted by signal\n");
		}
	}

done:
	drm_vblank_put(dev, crtc);
	return ret;
}

/**
 * Send the VBLANK signals.
 *
 * \param dev DRM device.
 * \param crtc CRTC where the vblank event occurred
 *
 * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
 *
 * If a signal is not requested, then calls vblank_wait().
 */
static void drm_vbl_send_signals(struct drm_device *dev, int crtc)
{
	struct drm_vbl_sig *vbl_sig, *tmp;
	struct list_head *vbl_sigs;
	unsigned int vbl_seq;
	unsigned long flags;

	spin_lock_irqsave(&dev->vbl_lock, flags);

	vbl_sigs = &dev->vbl_sigs[crtc];
	vbl_seq = drm_vblank_count(dev, crtc);

	list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) {
	    if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) {
		vbl_sig->info.si_code = vbl_seq;
		send_sig_info(vbl_sig->info.si_signo,
			      &vbl_sig->info, vbl_sig->task);

		list_del(&vbl_sig->head);

		drm_free(vbl_sig, sizeof(*vbl_sig),
			 DRM_MEM_DRIVER);
		atomic_dec(&dev->vbl_signal_pending);
		drm_vblank_put(dev, crtc);
	    }
	}

	spin_unlock_irqrestore(&dev->vbl_lock, flags);
}

/**
 * drm_handle_vblank - handle a vblank event
 * @dev: DRM device
 * @crtc: where this event occurred
 *
 * Drivers should call this routine in their vblank interrupt handlers to
 * update the vblank counter and send any signals that may be pending.
 */
void drm_handle_vblank(struct drm_device *dev, int crtc)
{
	atomic_inc(&dev->_vblank_count[crtc]);
	DRM_WAKEUP(&dev->vbl_queue[crtc]);
	drm_vbl_send_signals(dev, crtc);
}
EXPORT_SYMBOL(drm_handle_vblank);