summaryrefslogtreecommitdiffstats
path: root/drivers/char/drm/i915_irq.c
blob: 023ce66ef3ab2f8858b3946f9777484836c8a799 (plain)
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
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
/* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
 */
/*
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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, sub license, 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS 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 "drm.h"
#include "i915_drm.h"
#include "i915_drv.h"

#define USER_INT_FLAG (1<<1)
#define VSYNC_PIPEB_FLAG (1<<5)
#define VSYNC_PIPEA_FLAG (1<<7)

#define MAX_NOPID ((u32)~0)

/**
 * i915_get_pipe - return the the pipe associated with a given plane
 * @dev: DRM device
 * @plane: plane to look for
 *
 * The Intel Mesa & 2D drivers call the vblank routines with a plane number
 * rather than a pipe number, since they may not always be equal.  This routine
 * maps the given @plane back to a pipe number.
 */
static int
i915_get_pipe(struct drm_device *dev, int plane)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	u32 dspcntr;

	dspcntr = plane ? I915_READ(DSPBCNTR) : I915_READ(DSPACNTR);

	return dspcntr & DISPPLANE_SEL_PIPE_MASK ? 1 : 0;
}

/**
 * i915_get_plane - return the the plane associated with a given pipe
 * @dev: DRM device
 * @pipe: pipe to look for
 *
 * The Intel Mesa & 2D drivers call the vblank routines with a plane number
 * rather than a plane number, since they may not always be equal.  This routine
 * maps the given @pipe back to a plane number.
 */
static int
i915_get_plane(struct drm_device *dev, int pipe)
{
	if (i915_get_pipe(dev, 0) == pipe)
		return 0;
	return 1;
}

/**
 * i915_pipe_enabled - check if a pipe is enabled
 * @dev: DRM device
 * @pipe: pipe to check
 *
 * Reading certain registers when the pipe is disabled can hang the chip.
 * Use this routine to make sure the PLL is running and the pipe is active
 * before reading such registers if unsure.
 */
static int
i915_pipe_enabled(struct drm_device *dev, int pipe)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	unsigned long pipeconf = pipe ? PIPEBCONF : PIPEACONF;

	if (I915_READ(pipeconf) & PIPEACONF_ENABLE)
		return 1;

	return 0;
}

/**
 * Emit a synchronous flip.
 *
 * This function must be called with the drawable spinlock held.
 */
static void
i915_dispatch_vsync_flip(struct drm_device *dev, struct drm_drawable_info *drw,
			 int plane)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
	u16 x1, y1, x2, y2;
	int pf_planes = 1 << plane;

	/* If the window is visible on the other plane, we have to flip on that
	 * plane as well.
	 */
	if (plane == 1) {
		x1 = sarea_priv->planeA_x;
		y1 = sarea_priv->planeA_y;
		x2 = x1 + sarea_priv->planeA_w;
		y2 = y1 + sarea_priv->planeA_h;
	} else {
		x1 = sarea_priv->planeB_x;
		y1 = sarea_priv->planeB_y;
		x2 = x1 + sarea_priv->planeB_w;
		y2 = y1 + sarea_priv->planeB_h;
	}

	if (x2 > 0 && y2 > 0) {
		int i, num_rects = drw->num_rects;
		struct drm_clip_rect *rect = drw->rects;

		for (i = 0; i < num_rects; i++)
			if (!(rect[i].x1 >= x2 || rect[i].y1 >= y2 ||
			      rect[i].x2 <= x1 || rect[i].y2 <= y1)) {
				pf_planes = 0x3;

				break;
			}
	}

	i915_dispatch_flip(dev, pf_planes, 1);
}

/**
 * Emit blits for scheduled buffer swaps.
 *
 * This function will be called with the HW lock held.
 */
static void i915_vblank_tasklet(struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	struct list_head *list, *tmp, hits, *hit;
	int nhits, nrects, slice[2], upper[2], lower[2], i, num_pages;
	unsigned counter[2];
	struct drm_drawable_info *drw;
	drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
	u32 cpp = dev_priv->cpp,  offsets[3];
	u32 cmd = (cpp == 4) ? (XY_SRC_COPY_BLT_CMD |
				XY_SRC_COPY_BLT_WRITE_ALPHA |
				XY_SRC_COPY_BLT_WRITE_RGB)
			     : XY_SRC_COPY_BLT_CMD;
	u32 src_pitch = sarea_priv->pitch * cpp;
	u32 dst_pitch = sarea_priv->pitch * cpp;
	/* COPY rop (0xcc), map cpp to magic color depth constants */
	u32 ropcpp = (0xcc << 16) | ((cpp - 1) << 24);
	RING_LOCALS;

	if (sarea_priv->front_tiled) {
		cmd |= XY_SRC_COPY_BLT_DST_TILED;
		dst_pitch >>= 2;
	}
	if (sarea_priv->back_tiled) {
		cmd |= XY_SRC_COPY_BLT_SRC_TILED;
		src_pitch >>= 2;
	}

	counter[0] = drm_vblank_count(dev, 0);
	counter[1] = drm_vblank_count(dev, 1);

	DRM_DEBUG("\n");

	INIT_LIST_HEAD(&hits);

	nhits = nrects = 0;

	/* No irqsave/restore necessary.  This tasklet may be run in an
	 * interrupt context or normal context, but we don't have to worry
	 * about getting interrupted by something acquiring the lock, because
	 * we are the interrupt context thing that acquires the lock.
	 */
	spin_lock(&dev_priv->swaps_lock);

	/* Find buffer swaps scheduled for this vertical blank */
	list_for_each_safe(list, tmp, &dev_priv->vbl_swaps.head) {
		drm_i915_vbl_swap_t *vbl_swap =
			list_entry(list, drm_i915_vbl_swap_t, head);
		int pipe = i915_get_pipe(dev, vbl_swap->plane);

		if ((counter[pipe] - vbl_swap->sequence) > (1<<23))
			continue;

		list_del(list);
		dev_priv->swaps_pending--;
		drm_vblank_put(dev, pipe);

		spin_unlock(&dev_priv->swaps_lock);
		spin_lock(&dev->drw_lock);

		drw = drm_get_drawable_info(dev, vbl_swap->drw_id);

		if (!drw) {
			spin_unlock(&dev->drw_lock);
			drm_free(vbl_swap, sizeof(*vbl_swap), DRM_MEM_DRIVER);
			spin_lock(&dev_priv->swaps_lock);
			continue;
		}

		list_for_each(hit, &hits) {
			drm_i915_vbl_swap_t *swap_cmp =
				list_entry(hit, drm_i915_vbl_swap_t, head);
			struct drm_drawable_info *drw_cmp =
				drm_get_drawable_info(dev, swap_cmp->drw_id);

			if (drw_cmp &&
			    drw_cmp->rects[0].y1 > drw->rects[0].y1) {
				list_add_tail(list, hit);
				break;
			}
		}

		spin_unlock(&dev->drw_lock);

		/* List of hits was empty, or we reached the end of it */
		if (hit == &hits)
			list_add_tail(list, hits.prev);

		nhits++;

		spin_lock(&dev_priv->swaps_lock);
	}

	spin_unlock(&dev_priv->swaps_lock);

	if (nhits == 0)
		return;

	i915_kernel_lost_context(dev);

	upper[0] = upper[1] = 0;
	slice[0] = max(sarea_priv->planeA_h / nhits, 1);
	slice[1] = max(sarea_priv->planeB_h / nhits, 1);
	lower[0] = sarea_priv->planeA_y + slice[0];
	lower[1] = sarea_priv->planeB_y + slice[0];

	offsets[0] = sarea_priv->front_offset;
	offsets[1] = sarea_priv->back_offset;
	offsets[2] = sarea_priv->third_offset;
	num_pages = sarea_priv->third_handle ? 3 : 2;

	spin_lock(&dev->drw_lock);

	/* Emit blits for buffer swaps, partitioning both outputs into as many
	 * slices as there are buffer swaps scheduled in order to avoid tearing
	 * (based on the assumption that a single buffer swap would always
	 * complete before scanout starts).
	 */
	for (i = 0; i++ < nhits;
	     upper[0] = lower[0], lower[0] += slice[0],
	     upper[1] = lower[1], lower[1] += slice[1]) {
		int init_drawrect = 1;

		if (i == nhits)
			lower[0] = lower[1] = sarea_priv->height;

		list_for_each(hit, &hits) {
			drm_i915_vbl_swap_t *swap_hit =
				list_entry(hit, drm_i915_vbl_swap_t, head);
			struct drm_clip_rect *rect;
			int num_rects, plane, front, back;
			unsigned short top, bottom;

			drw = drm_get_drawable_info(dev, swap_hit->drw_id);

			if (!drw)
				continue;

			plane = swap_hit->plane;

			if (swap_hit->flip) {
				i915_dispatch_vsync_flip(dev, drw, plane);
				continue;
			}

			if (init_drawrect) {
				int width  = sarea_priv->width;
				int height = sarea_priv->height;
				if (IS_I965G(dev)) {
					BEGIN_LP_RING(4);

					OUT_RING(GFX_OP_DRAWRECT_INFO_I965);
					OUT_RING(0);
					OUT_RING(((width - 1) & 0xffff) | ((height - 1) << 16));
					OUT_RING(0);

					ADVANCE_LP_RING();
				} else {
					BEGIN_LP_RING(6);

					OUT_RING(GFX_OP_DRAWRECT_INFO);
					OUT_RING(0);
					OUT_RING(0);
					OUT_RING(((width - 1) & 0xffff) | ((height - 1) << 16));
					OUT_RING(0);
					OUT_RING(0);

					ADVANCE_LP_RING();
				}

				sarea_priv->ctxOwner = DRM_KERNEL_CONTEXT;

				init_drawrect = 0;
			}

			rect = drw->rects;
			top = upper[plane];
			bottom = lower[plane];

			front = (dev_priv->sarea_priv->pf_current_page >>
				 (2 * plane)) & 0x3;
			back = (front + 1) % num_pages;

			for (num_rects = drw->num_rects; num_rects--; rect++) {
				int y1 = max(rect->y1, top);
				int y2 = min(rect->y2, bottom);

				if (y1 >= y2)
					continue;

				BEGIN_LP_RING(8);

				OUT_RING(cmd);
				OUT_RING(ropcpp | dst_pitch);
				OUT_RING((y1 << 16) | rect->x1);
				OUT_RING((y2 << 16) | rect->x2);
				OUT_RING(offsets[front]);
				OUT_RING((y1 << 16) | rect->x1);
				OUT_RING(src_pitch);
				OUT_RING(offsets[back]);

				ADVANCE_LP_RING();
			}
		}
	}

	spin_unlock(&dev->drw_lock);

	list_for_each_safe(hit, tmp, &hits) {
		drm_i915_vbl_swap_t *swap_hit =
			list_entry(hit, drm_i915_vbl_swap_t, head);

		list_del(hit);

		drm_free(swap_hit, sizeof(*swap_hit), DRM_MEM_DRIVER);
	}
}

u32 i915_get_vblank_counter(struct drm_device *dev, int plane)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	unsigned long high_frame;
	unsigned long low_frame;
	u32 high1, high2, low, count;
	int pipe;

	pipe = i915_get_pipe(dev, plane);
	high_frame = pipe ? PIPEBFRAMEHIGH : PIPEAFRAMEHIGH;
	low_frame = pipe ? PIPEBFRAMEPIXEL : PIPEAFRAMEPIXEL;

	if (!i915_pipe_enabled(dev, pipe)) {
	    printk(KERN_ERR "trying to get vblank count for disabled "
		   "pipe %d\n", pipe);
	    return 0;
	}

	/*
	 * High & low register fields aren't synchronized, so make sure
	 * we get a low value that's stable across two reads of the high
	 * register.
	 */
	do {
		high1 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
			 PIPE_FRAME_HIGH_SHIFT);
		low =  ((I915_READ(low_frame) & PIPE_FRAME_LOW_MASK) >>
			PIPE_FRAME_LOW_SHIFT);
		high2 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
			 PIPE_FRAME_HIGH_SHIFT);
	} while (high1 != high2);

	count = (high1 << 8) | low;

	/* count may be reset by other driver(e.g. 2D driver),
	   we have no way to know if it is wrapped or resetted
	   when count is zero. do a rough guess.
	*/
	if (count == 0 && dev->last_vblank[pipe] < dev->max_vblank_count/2)
		dev->last_vblank[pipe] = 0;

	return count;
}

irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
{
	struct drm_device *dev = (struct drm_device *) arg;
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	u32 iir;
	u32 pipea_stats, pipeb_stats;
	int vblank = 0;

	iir = I915_READ(I915REG_INT_IDENTITY_R);
	if (iir == 0) {
		DRM_DEBUG ("iir 0x%08x im 0x%08x ie 0x%08x pipea 0x%08x pipeb 0x%08x\n",
			   iir,
			   I915_READ(I915REG_INT_MASK_R),
			   I915_READ(I915REG_INT_ENABLE_R),
			   I915_READ(I915REG_PIPEASTAT),
			   I915_READ(I915REG_PIPEBSTAT));
		return IRQ_NONE;
	}

	/*
	 * Clear the PIPE(A|B)STAT regs before the IIR otherwise
	 * we may get extra interrupts.
	 */
	if (iir & I915_DISPLAY_PIPE_A_EVENT_INTERRUPT) {
		pipea_stats = I915_READ(I915REG_PIPEASTAT);
		if (pipea_stats & (I915_START_VBLANK_INTERRUPT_STATUS|
				   I915_VBLANK_INTERRUPT_STATUS))
		{
			vblank++;
			drm_handle_vblank(dev, i915_get_plane(dev, 0));
		}
		I915_WRITE(I915REG_PIPEASTAT, pipea_stats);
	}
	if (iir & I915_DISPLAY_PIPE_B_EVENT_INTERRUPT) {
		pipeb_stats = I915_READ(I915REG_PIPEBSTAT);
		if (pipeb_stats & (I915_START_VBLANK_INTERRUPT_STATUS|
				   I915_VBLANK_INTERRUPT_STATUS))
		{
			vblank++;
			drm_handle_vblank(dev, i915_get_plane(dev, 1));
		}
		I915_WRITE(I915REG_PIPEBSTAT, pipeb_stats);
	}

	if (dev_priv->sarea_priv)
	    dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);

	I915_WRITE(I915REG_INT_IDENTITY_R, iir);
	(void) I915_READ(I915REG_INT_IDENTITY_R); /* Flush posted write */

	if (iir & I915_USER_INTERRUPT) {
		DRM_WAKEUP(&dev_priv->irq_queue);
	}
	if (vblank) {
		if (dev_priv->swaps_pending > 0)
			drm_locked_tasklet(dev, i915_vblank_tasklet);
	}

	return IRQ_HANDLED;
}

static int i915_emit_irq(struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	RING_LOCALS;

	i915_kernel_lost_context(dev);

	DRM_DEBUG("\n");

	dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;

	if (dev_priv->counter > 0x7FFFFFFFUL)
		dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;

	BEGIN_LP_RING(6);
	OUT_RING(CMD_STORE_DWORD_IDX);
	OUT_RING(20);
	OUT_RING(dev_priv->counter);
	OUT_RING(0);
	OUT_RING(0);
	OUT_RING(GFX_OP_USER_INTERRUPT);
	ADVANCE_LP_RING();

	return dev_priv->counter;
}

static int i915_wait_irq(struct drm_device * dev, int irq_nr)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	int ret = 0;

	DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
		  READ_BREADCRUMB(dev_priv));

	if (READ_BREADCRUMB(dev_priv) >= irq_nr)
		return 0;

	dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;

	DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
		    READ_BREADCRUMB(dev_priv) >= irq_nr);

	if (ret == -EBUSY) {
		DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
			  READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
	}

	if (dev_priv->sarea_priv)
		dev_priv->sarea_priv->last_dispatch =
			READ_BREADCRUMB(dev_priv);
	return ret;
}

/* Needs the lock as it touches the ring.
 */
int i915_irq_emit(struct drm_device *dev, void *data,
			 struct drm_file *file_priv)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_irq_emit_t *emit = data;
	int result;

	LOCK_TEST_WITH_RETURN(dev, file_priv);

	if (!dev_priv) {
		DRM_ERROR("called with no initialization\n");
		return -EINVAL;
	}

	result = i915_emit_irq(dev);

	if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
		DRM_ERROR("copy_to_user\n");
		return -EFAULT;
	}

	return 0;
}

/* Doesn't need the hardware lock.
 */
int i915_irq_wait(struct drm_device *dev, void *data,
			 struct drm_file *file_priv)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_irq_wait_t *irqwait = data;

	if (!dev_priv) {
		DRM_ERROR("called with no initialization\n");
		return -EINVAL;
	}

	return i915_wait_irq(dev, irqwait->irq_seq);
}

int i915_enable_vblank(struct drm_device *dev, int plane)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	int pipe = i915_get_pipe(dev, plane);
	u32	pipestat_reg = 0;
	u32	pipestat;

	switch (pipe) {
	case 0:
		pipestat_reg = I915REG_PIPEASTAT;
		dev_priv->irq_enable_reg |= I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
		break;
	case 1:
		pipestat_reg = I915REG_PIPEBSTAT;
		dev_priv->irq_enable_reg |= I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
		break;
	default:
		DRM_ERROR("tried to enable vblank on non-existent pipe %d\n",
			  pipe);
		break;
	}

	if (pipestat_reg)
	{
		pipestat = I915_READ (pipestat_reg);
		/*
		 * Older chips didn't have the start vblank interrupt,
		 * but
		 */
		if (IS_I965G (dev))
			pipestat |= I915_START_VBLANK_INTERRUPT_ENABLE;
		else
			pipestat |= I915_VBLANK_INTERRUPT_ENABLE;
		/*
		 * Clear any pending status
		 */
		pipestat |= (I915_START_VBLANK_INTERRUPT_STATUS |
			     I915_VBLANK_INTERRUPT_STATUS);
		I915_WRITE(pipestat_reg, pipestat);
	}
	I915_WRITE(I915REG_INT_ENABLE_R, dev_priv->irq_enable_reg);

	return 0;
}

void i915_disable_vblank(struct drm_device *dev, int plane)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	int pipe = i915_get_pipe(dev, plane);
	u32	pipestat_reg = 0;
	u32	pipestat;

	switch (pipe) {
	case 0:
		pipestat_reg = I915REG_PIPEASTAT;
		dev_priv->irq_enable_reg &= ~I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
		break;
	case 1:
		pipestat_reg = I915REG_PIPEBSTAT;
		dev_priv->irq_enable_reg &= ~I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
		break;
	default:
		DRM_ERROR("tried to disable vblank on non-existent pipe %d\n",
			  pipe);
		break;
	}

	I915_WRITE(I915REG_INT_ENABLE_R, dev_priv->irq_enable_reg);
	if (pipestat_reg)
	{
		pipestat = I915_READ (pipestat_reg);
		pipestat &= ~(I915_START_VBLANK_INTERRUPT_ENABLE |
			      I915_VBLANK_INTERRUPT_ENABLE);
		/*
		 * Clear any pending status
		 */
		pipestat |= (I915_START_VBLANK_INTERRUPT_STATUS |
			     I915_VBLANK_INTERRUPT_STATUS);
		I915_WRITE(pipestat_reg, pipestat);
	}
}

static void i915_enable_interrupt (struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;

	dev_priv->irq_enable_reg |= I915_USER_INTERRUPT;

	I915_WRITE(I915REG_INT_ENABLE_R, dev_priv->irq_enable_reg);
	dev_priv->irq_enabled = 1;
}

/* Set the vblank monitor pipe
 */
int i915_vblank_pipe_set(struct drm_device *dev, void *data,
			 struct drm_file *file_priv)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_vblank_pipe_t *pipe = data;

	if (!dev_priv) {
		DRM_ERROR("called with no initialization\n");
		return -EINVAL;
	}

	if (pipe->pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
		DRM_ERROR("called with invalid pipe 0x%x\n", pipe->pipe);
		return -EINVAL;
	}

	dev_priv->vblank_pipe = pipe->pipe;

	return 0;
}

int i915_vblank_pipe_get(struct drm_device *dev, void *data,
			 struct drm_file *file_priv)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_vblank_pipe_t *pipe = data;
	u16 flag;

	if (!dev_priv) {
		DRM_ERROR("called with no initialization\n");
		return -EINVAL;
	}

	flag = I915_READ(I915REG_INT_ENABLE_R);
	pipe->pipe = 0;
	if (flag & I915_DISPLAY_PIPE_A_EVENT_INTERRUPT)
		pipe->pipe |= DRM_I915_VBLANK_PIPE_A;
	if (flag & I915_DISPLAY_PIPE_B_EVENT_INTERRUPT)
		pipe->pipe |= DRM_I915_VBLANK_PIPE_B;

	return 0;
}

/**
 * Schedule buffer swap at given vertical blank.
 */
int i915_vblank_swap(struct drm_device *dev, void *data,
		     struct drm_file *file_priv)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_vblank_swap_t *swap = data;
	drm_i915_vbl_swap_t *vbl_swap;
	unsigned int pipe, seqtype, curseq, plane;
	unsigned long irqflags;
	struct list_head *list;
	int ret;

	if (!dev_priv) {
		DRM_ERROR("%s called with no initialization\n", __func__);
		return -EINVAL;
	}

	if (!dev_priv->sarea_priv || dev_priv->sarea_priv->rotation) {
		DRM_DEBUG("Rotation not supported\n");
		return -EINVAL;
	}

	if (swap->seqtype & ~(_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE |
			     _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS |
			     _DRM_VBLANK_FLIP)) {
		DRM_ERROR("Invalid sequence type 0x%x\n", swap->seqtype);
		return -EINVAL;
	}

	plane = (swap->seqtype & _DRM_VBLANK_SECONDARY) ? 1 : 0;
	pipe = i915_get_pipe(dev, plane);

	seqtype = swap->seqtype & (_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE);

	if (!(dev_priv->vblank_pipe & (1 << pipe))) {
		DRM_ERROR("Invalid pipe %d\n", pipe);
		return -EINVAL;
	}

	spin_lock_irqsave(&dev->drw_lock, irqflags);

	/* It makes no sense to schedule a swap for a drawable that doesn't have
	 * valid information at this point. E.g. this could mean that the X
	 * server is too old to push drawable information to the DRM, in which
	 * case all such swaps would become ineffective.
	 */
	if (!drm_get_drawable_info(dev, swap->drawable)) {
		spin_unlock_irqrestore(&dev->drw_lock, irqflags);
		DRM_DEBUG("Invalid drawable ID %d\n", swap->drawable);
		return -EINVAL;
	}

	spin_unlock_irqrestore(&dev->drw_lock, irqflags);

	drm_update_vblank_count(dev, pipe);
	curseq = drm_vblank_count(dev, pipe);

	if (seqtype == _DRM_VBLANK_RELATIVE)
		swap->sequence += curseq;

	if ((curseq - swap->sequence) <= (1<<23)) {
		if (swap->seqtype & _DRM_VBLANK_NEXTONMISS) {
			swap->sequence = curseq + 1;
		} else {
			DRM_DEBUG("Missed target sequence\n");
			return -EINVAL;
		}
	}

	if (swap->seqtype & _DRM_VBLANK_FLIP) {
		swap->sequence--;

		if ((curseq - swap->sequence) <= (1<<23)) {
			struct drm_drawable_info *drw;

			LOCK_TEST_WITH_RETURN(dev, file_priv);

			spin_lock_irqsave(&dev->drw_lock, irqflags);

			drw = drm_get_drawable_info(dev, swap->drawable);

			if (!drw) {
				spin_unlock_irqrestore(&dev->drw_lock,
				    irqflags);
				DRM_DEBUG("Invalid drawable ID %d\n",
					  swap->drawable);
				return -EINVAL;
			}

			i915_dispatch_vsync_flip(dev, drw, plane);

			spin_unlock_irqrestore(&dev->drw_lock, irqflags);

			return 0;
		}
	}

	spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);

	list_for_each(list, &dev_priv->vbl_swaps.head) {
		vbl_swap = list_entry(list, drm_i915_vbl_swap_t, head);

		if (vbl_swap->drw_id == swap->drawable &&
		    vbl_swap->plane == plane &&
		    vbl_swap->sequence == swap->sequence) {
			vbl_swap->flip = (swap->seqtype & _DRM_VBLANK_FLIP);
			spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
			DRM_DEBUG("Already scheduled\n");
			return 0;
		}
	}

	spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);

	if (dev_priv->swaps_pending >= 100) {
		DRM_DEBUG("Too many swaps queued\n");
		return -EBUSY;
	}

	vbl_swap = drm_calloc(1, sizeof(*vbl_swap), DRM_MEM_DRIVER);

	if (!vbl_swap) {
		DRM_ERROR("Failed to allocate memory to queue swap\n");
		return -ENOMEM;
	}

	DRM_DEBUG("\n");

	ret = drm_vblank_get(dev, pipe);
	if (ret) {
		drm_free(vbl_swap, sizeof(*vbl_swap), DRM_MEM_DRIVER);
		return ret;
	}

	vbl_swap->drw_id = swap->drawable;
	vbl_swap->plane = plane;
	vbl_swap->sequence = swap->sequence;
	vbl_swap->flip = (swap->seqtype & _DRM_VBLANK_FLIP);

	if (vbl_swap->flip)
		swap->sequence++;

	spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);

	list_add_tail(&vbl_swap->head, &dev_priv->vbl_swaps.head);
	dev_priv->swaps_pending++;

	spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);

	return 0;
}

/* drm_dma.h hooks
*/
void i915_driver_irq_preinstall(struct drm_device * dev)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;

	I915_WRITE16(I915REG_HWSTAM, 0xeffe);
	I915_WRITE16(I915REG_INT_MASK_R, 0x0);
	I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
}

int i915_driver_irq_postinstall(struct drm_device * dev)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	int ret, num_pipes = 2;

	spin_lock_init(&dev_priv->swaps_lock);
	INIT_LIST_HEAD(&dev_priv->vbl_swaps.head);
	dev_priv->swaps_pending = 0;

	dev_priv->user_irq_refcount = 0;
	dev_priv->irq_enable_reg = 0;

	ret = drm_vblank_init(dev, num_pipes);
	if (ret)
		return ret;

	dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */

	i915_enable_interrupt(dev);
	DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);

	/*
	 * Initialize the hardware status page IRQ location.
	 */

	I915_WRITE(I915REG_INSTPM, (1 << 5) | (1 << 21));
	return 0;
}

void i915_driver_irq_uninstall(struct drm_device * dev)
{
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
	u32 temp;

	if (!dev_priv)
		return;

	dev_priv->irq_enabled = 0;
	I915_WRITE(I915REG_HWSTAM, 0xffffffff);
	I915_WRITE(I915REG_INT_MASK_R, 0xffffffff);
	I915_WRITE(I915REG_INT_ENABLE_R, 0x0);

	temp = I915_READ(I915REG_PIPEASTAT);
	I915_WRITE(I915REG_PIPEASTAT, temp);
	temp = I915_READ(I915REG_PIPEBSTAT);
	I915_WRITE(I915REG_PIPEBSTAT, temp);
	temp = I915_READ(I915REG_INT_IDENTITY_R);
	I915_WRITE(I915REG_INT_IDENTITY_R, temp);
}
OpenPOWER on IntegriCloud