drm: don't cast a pointer to pointer of list_head
[sfrench/cifs-2.6.git] / drivers / char / drm / i915_irq.c
1 /* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
2  */
3 /*
4  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
5  * All Rights Reserved.
6  *
7  * Permission is hereby granted, free of charge, to any person obtaining a
8  * copy of this software and associated documentation files (the
9  * "Software"), to deal in the Software without restriction, including
10  * without limitation the rights to use, copy, modify, merge, publish,
11  * distribute, sub license, and/or sell copies of the Software, and to
12  * permit persons to whom the Software is furnished to do so, subject to
13  * the following conditions:
14  *
15  * The above copyright notice and this permission notice (including the
16  * next paragraph) shall be included in all copies or substantial portions
17  * of the Software.
18  *
19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26  *
27  */
28
29 #include "drmP.h"
30 #include "drm.h"
31 #include "i915_drm.h"
32 #include "i915_drv.h"
33
34 #define USER_INT_FLAG (1<<1)
35 #define VSYNC_PIPEB_FLAG (1<<5)
36 #define VSYNC_PIPEA_FLAG (1<<7)
37
38 #define MAX_NOPID ((u32)~0)
39
40 /**
41  * Emit blits for scheduled buffer swaps.
42  *
43  * This function will be called with the HW lock held.
44  */
45 static void i915_vblank_tasklet(struct drm_device *dev)
46 {
47         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
48         unsigned long irqflags;
49         struct list_head *list, *tmp, hits, *hit;
50         int nhits, nrects, slice[2], upper[2], lower[2], i;
51         unsigned counter[2] = { atomic_read(&dev->vbl_received),
52                                 atomic_read(&dev->vbl_received2) };
53         struct drm_drawable_info *drw;
54         drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
55         u32 cpp = dev_priv->cpp;
56         u32 cmd = (cpp == 4) ? (XY_SRC_COPY_BLT_CMD |
57                                 XY_SRC_COPY_BLT_WRITE_ALPHA |
58                                 XY_SRC_COPY_BLT_WRITE_RGB)
59                              : XY_SRC_COPY_BLT_CMD;
60         u32 pitchropcpp = (sarea_priv->pitch * cpp) | (0xcc << 16) |
61                           (cpp << 23) | (1 << 24);
62         RING_LOCALS;
63
64         DRM_DEBUG("\n");
65
66         INIT_LIST_HEAD(&hits);
67
68         nhits = nrects = 0;
69
70         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
71
72         /* Find buffer swaps scheduled for this vertical blank */
73         list_for_each_safe(list, tmp, &dev_priv->vbl_swaps.head) {
74                 drm_i915_vbl_swap_t *vbl_swap =
75                         list_entry(list, drm_i915_vbl_swap_t, head);
76
77                 if ((counter[vbl_swap->pipe] - vbl_swap->sequence) > (1<<23))
78                         continue;
79
80                 list_del(list);
81                 dev_priv->swaps_pending--;
82
83                 spin_unlock(&dev_priv->swaps_lock);
84                 spin_lock(&dev->drw_lock);
85
86                 drw = drm_get_drawable_info(dev, vbl_swap->drw_id);
87
88                 if (!drw) {
89                         spin_unlock(&dev->drw_lock);
90                         drm_free(vbl_swap, sizeof(*vbl_swap), DRM_MEM_DRIVER);
91                         spin_lock(&dev_priv->swaps_lock);
92                         continue;
93                 }
94
95                 list_for_each(hit, &hits) {
96                         drm_i915_vbl_swap_t *swap_cmp =
97                                 list_entry(hit, drm_i915_vbl_swap_t, head);
98                         struct drm_drawable_info *drw_cmp =
99                                 drm_get_drawable_info(dev, swap_cmp->drw_id);
100
101                         if (drw_cmp &&
102                             drw_cmp->rects[0].y1 > drw->rects[0].y1) {
103                                 list_add_tail(list, hit);
104                                 break;
105                         }
106                 }
107
108                 spin_unlock(&dev->drw_lock);
109
110                 /* List of hits was empty, or we reached the end of it */
111                 if (hit == &hits)
112                         list_add_tail(list, hits.prev);
113
114                 nhits++;
115
116                 spin_lock(&dev_priv->swaps_lock);
117         }
118
119         if (nhits == 0) {
120                 spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
121                 return;
122         }
123
124         spin_unlock(&dev_priv->swaps_lock);
125
126         i915_kernel_lost_context(dev);
127
128         BEGIN_LP_RING(6);
129
130         OUT_RING(GFX_OP_DRAWRECT_INFO);
131         OUT_RING(0);
132         OUT_RING(0);
133         OUT_RING(sarea_priv->width | sarea_priv->height << 16);
134         OUT_RING(sarea_priv->width | sarea_priv->height << 16);
135         OUT_RING(0);
136
137         ADVANCE_LP_RING();
138
139         sarea_priv->ctxOwner = DRM_KERNEL_CONTEXT;
140
141         upper[0] = upper[1] = 0;
142         slice[0] = max(sarea_priv->pipeA_h / nhits, 1);
143         slice[1] = max(sarea_priv->pipeB_h / nhits, 1);
144         lower[0] = sarea_priv->pipeA_y + slice[0];
145         lower[1] = sarea_priv->pipeB_y + slice[0];
146
147         spin_lock(&dev->drw_lock);
148
149         /* Emit blits for buffer swaps, partitioning both outputs into as many
150          * slices as there are buffer swaps scheduled in order to avoid tearing
151          * (based on the assumption that a single buffer swap would always
152          * complete before scanout starts).
153          */
154         for (i = 0; i++ < nhits;
155              upper[0] = lower[0], lower[0] += slice[0],
156              upper[1] = lower[1], lower[1] += slice[1]) {
157                 if (i == nhits)
158                         lower[0] = lower[1] = sarea_priv->height;
159
160                 list_for_each(hit, &hits) {
161                         drm_i915_vbl_swap_t *swap_hit =
162                                 list_entry(hit, drm_i915_vbl_swap_t, head);
163                         struct drm_clip_rect *rect;
164                         int num_rects, pipe;
165                         unsigned short top, bottom;
166
167                         drw = drm_get_drawable_info(dev, swap_hit->drw_id);
168
169                         if (!drw)
170                                 continue;
171
172                         rect = drw->rects;
173                         pipe = swap_hit->pipe;
174                         top = upper[pipe];
175                         bottom = lower[pipe];
176
177                         for (num_rects = drw->num_rects; num_rects--; rect++) {
178                                 int y1 = max(rect->y1, top);
179                                 int y2 = min(rect->y2, bottom);
180
181                                 if (y1 >= y2)
182                                         continue;
183
184                                 BEGIN_LP_RING(8);
185
186                                 OUT_RING(cmd);
187                                 OUT_RING(pitchropcpp);
188                                 OUT_RING((y1 << 16) | rect->x1);
189                                 OUT_RING((y2 << 16) | rect->x2);
190                                 OUT_RING(sarea_priv->front_offset);
191                                 OUT_RING((y1 << 16) | rect->x1);
192                                 OUT_RING(pitchropcpp & 0xffff);
193                                 OUT_RING(sarea_priv->back_offset);
194
195                                 ADVANCE_LP_RING();
196                         }
197                 }
198         }
199
200         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
201
202         list_for_each_safe(hit, tmp, &hits) {
203                 drm_i915_vbl_swap_t *swap_hit =
204                         list_entry(hit, drm_i915_vbl_swap_t, head);
205
206                 list_del(hit);
207
208                 drm_free(swap_hit, sizeof(*swap_hit), DRM_MEM_DRIVER);
209         }
210 }
211
212 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
213 {
214         struct drm_device *dev = (struct drm_device *) arg;
215         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
216         u16 temp;
217         u32 pipea_stats, pipeb_stats;
218
219         pipea_stats = I915_READ(I915REG_PIPEASTAT);
220         pipeb_stats = I915_READ(I915REG_PIPEBSTAT);
221
222         temp = I915_READ16(I915REG_INT_IDENTITY_R);
223
224         temp &= (USER_INT_FLAG | VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG);
225
226         DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);
227
228         if (temp == 0)
229                 return IRQ_NONE;
230
231         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
232         (void) I915_READ16(I915REG_INT_IDENTITY_R);
233         DRM_READMEMORYBARRIER();
234
235         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
236
237         if (temp & USER_INT_FLAG)
238                 DRM_WAKEUP(&dev_priv->irq_queue);
239
240         if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
241                 int vblank_pipe = dev_priv->vblank_pipe;
242
243                 if ((vblank_pipe &
244                      (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B))
245                     == (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B)) {
246                         if (temp & VSYNC_PIPEA_FLAG)
247                                 atomic_inc(&dev->vbl_received);
248                         if (temp & VSYNC_PIPEB_FLAG)
249                                 atomic_inc(&dev->vbl_received2);
250                 } else if (((temp & VSYNC_PIPEA_FLAG) &&
251                             (vblank_pipe & DRM_I915_VBLANK_PIPE_A)) ||
252                            ((temp & VSYNC_PIPEB_FLAG) &&
253                             (vblank_pipe & DRM_I915_VBLANK_PIPE_B)))
254                         atomic_inc(&dev->vbl_received);
255
256                 DRM_WAKEUP(&dev->vbl_queue);
257                 drm_vbl_send_signals(dev);
258
259                 if (dev_priv->swaps_pending > 0)
260                         drm_locked_tasklet(dev, i915_vblank_tasklet);
261                 I915_WRITE(I915REG_PIPEASTAT,
262                         pipea_stats|I915_VBLANK_INTERRUPT_ENABLE|
263                         I915_VBLANK_CLEAR);
264                 I915_WRITE(I915REG_PIPEBSTAT,
265                         pipeb_stats|I915_VBLANK_INTERRUPT_ENABLE|
266                         I915_VBLANK_CLEAR);
267         }
268
269         return IRQ_HANDLED;
270 }
271
272 static int i915_emit_irq(struct drm_device * dev)
273 {
274         drm_i915_private_t *dev_priv = dev->dev_private;
275         RING_LOCALS;
276
277         i915_kernel_lost_context(dev);
278
279         DRM_DEBUG("%s\n", __FUNCTION__);
280
281         dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;
282
283         if (dev_priv->counter > 0x7FFFFFFFUL)
284                 dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;
285
286         BEGIN_LP_RING(6);
287         OUT_RING(CMD_STORE_DWORD_IDX);
288         OUT_RING(20);
289         OUT_RING(dev_priv->counter);
290         OUT_RING(0);
291         OUT_RING(0);
292         OUT_RING(GFX_OP_USER_INTERRUPT);
293         ADVANCE_LP_RING();
294
295         return dev_priv->counter;
296 }
297
298 static int i915_wait_irq(struct drm_device * dev, int irq_nr)
299 {
300         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
301         int ret = 0;
302
303         DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr,
304                   READ_BREADCRUMB(dev_priv));
305
306         if (READ_BREADCRUMB(dev_priv) >= irq_nr)
307                 return 0;
308
309         dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
310
311         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
312                     READ_BREADCRUMB(dev_priv) >= irq_nr);
313
314         if (ret == -EBUSY) {
315                 DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
316                           __FUNCTION__,
317                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
318         }
319
320         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
321         return ret;
322 }
323
324 static int i915_driver_vblank_do_wait(struct drm_device *dev, unsigned int *sequence,
325                                       atomic_t *counter)
326 {
327         drm_i915_private_t *dev_priv = dev->dev_private;
328         unsigned int cur_vblank;
329         int ret = 0;
330
331         if (!dev_priv) {
332                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
333                 return -EINVAL;
334         }
335
336         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
337                     (((cur_vblank = atomic_read(counter))
338                         - *sequence) <= (1<<23)));
339
340         *sequence = cur_vblank;
341
342         return ret;
343 }
344
345
346 int i915_driver_vblank_wait(struct drm_device *dev, unsigned int *sequence)
347 {
348         return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received);
349 }
350
351 int i915_driver_vblank_wait2(struct drm_device *dev, unsigned int *sequence)
352 {
353         return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received2);
354 }
355
356 /* Needs the lock as it touches the ring.
357  */
358 int i915_irq_emit(struct drm_device *dev, void *data,
359                          struct drm_file *file_priv)
360 {
361         drm_i915_private_t *dev_priv = dev->dev_private;
362         drm_i915_irq_emit_t *emit = data;
363         int result;
364
365         LOCK_TEST_WITH_RETURN(dev, file_priv);
366
367         if (!dev_priv) {
368                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
369                 return -EINVAL;
370         }
371
372         result = i915_emit_irq(dev);
373
374         if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
375                 DRM_ERROR("copy_to_user\n");
376                 return -EFAULT;
377         }
378
379         return 0;
380 }
381
382 /* Doesn't need the hardware lock.
383  */
384 int i915_irq_wait(struct drm_device *dev, void *data,
385                          struct drm_file *file_priv)
386 {
387         drm_i915_private_t *dev_priv = dev->dev_private;
388         drm_i915_irq_wait_t *irqwait = data;
389
390         if (!dev_priv) {
391                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
392                 return -EINVAL;
393         }
394
395         return i915_wait_irq(dev, irqwait->irq_seq);
396 }
397
398 static void i915_enable_interrupt (struct drm_device *dev)
399 {
400         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
401         u16 flag;
402
403         flag = 0;
404         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A)
405                 flag |= VSYNC_PIPEA_FLAG;
406         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
407                 flag |= VSYNC_PIPEB_FLAG;
408
409         I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | flag);
410 }
411
412 /* Set the vblank monitor pipe
413  */
414 int i915_vblank_pipe_set(struct drm_device *dev, void *data,
415                          struct drm_file *file_priv)
416 {
417         drm_i915_private_t *dev_priv = dev->dev_private;
418         drm_i915_vblank_pipe_t *pipe = data;
419
420         if (!dev_priv) {
421                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
422                 return -EINVAL;
423         }
424
425         if (pipe->pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
426                 DRM_ERROR("%s called with invalid pipe 0x%x\n",
427                           __FUNCTION__, pipe->pipe);
428                 return -EINVAL;
429         }
430
431         dev_priv->vblank_pipe = pipe->pipe;
432
433         i915_enable_interrupt (dev);
434
435         return 0;
436 }
437
438 int i915_vblank_pipe_get(struct drm_device *dev, void *data,
439                          struct drm_file *file_priv)
440 {
441         drm_i915_private_t *dev_priv = dev->dev_private;
442         drm_i915_vblank_pipe_t *pipe = data;
443         u16 flag;
444
445         if (!dev_priv) {
446                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
447                 return -EINVAL;
448         }
449
450         flag = I915_READ(I915REG_INT_ENABLE_R);
451         pipe->pipe = 0;
452         if (flag & VSYNC_PIPEA_FLAG)
453                 pipe->pipe |= DRM_I915_VBLANK_PIPE_A;
454         if (flag & VSYNC_PIPEB_FLAG)
455                 pipe->pipe |= DRM_I915_VBLANK_PIPE_B;
456
457         return 0;
458 }
459
460 /**
461  * Schedule buffer swap at given vertical blank.
462  */
463 int i915_vblank_swap(struct drm_device *dev, void *data,
464                      struct drm_file *file_priv)
465 {
466         drm_i915_private_t *dev_priv = dev->dev_private;
467         drm_i915_vblank_swap_t *swap = data;
468         drm_i915_vbl_swap_t *vbl_swap;
469         unsigned int pipe, seqtype, curseq;
470         unsigned long irqflags;
471         struct list_head *list;
472
473         if (!dev_priv) {
474                 DRM_ERROR("%s called with no initialization\n", __func__);
475                 return -EINVAL;
476         }
477
478         if (dev_priv->sarea_priv->rotation) {
479                 DRM_DEBUG("Rotation not supported\n");
480                 return -EINVAL;
481         }
482
483         if (swap->seqtype & ~(_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE |
484                              _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS)) {
485                 DRM_ERROR("Invalid sequence type 0x%x\n", swap->seqtype);
486                 return -EINVAL;
487         }
488
489         pipe = (swap->seqtype & _DRM_VBLANK_SECONDARY) ? 1 : 0;
490
491         seqtype = swap->seqtype & (_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE);
492
493         if (!(dev_priv->vblank_pipe & (1 << pipe))) {
494                 DRM_ERROR("Invalid pipe %d\n", pipe);
495                 return -EINVAL;
496         }
497
498         spin_lock_irqsave(&dev->drw_lock, irqflags);
499
500         if (!drm_get_drawable_info(dev, swap->drawable)) {
501                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
502                 DRM_DEBUG("Invalid drawable ID %d\n", swap->drawable);
503                 return -EINVAL;
504         }
505
506         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
507
508         curseq = atomic_read(pipe ? &dev->vbl_received2 : &dev->vbl_received);
509
510         if (seqtype == _DRM_VBLANK_RELATIVE)
511                 swap->sequence += curseq;
512
513         if ((curseq - swap->sequence) <= (1<<23)) {
514                 if (swap->seqtype & _DRM_VBLANK_NEXTONMISS) {
515                         swap->sequence = curseq + 1;
516                 } else {
517                         DRM_DEBUG("Missed target sequence\n");
518                         return -EINVAL;
519                 }
520         }
521
522         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
523
524         list_for_each(list, &dev_priv->vbl_swaps.head) {
525                 vbl_swap = list_entry(list, drm_i915_vbl_swap_t, head);
526
527                 if (vbl_swap->drw_id == swap->drawable &&
528                     vbl_swap->pipe == pipe &&
529                     vbl_swap->sequence == swap->sequence) {
530                         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
531                         DRM_DEBUG("Already scheduled\n");
532                         return 0;
533                 }
534         }
535
536         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
537
538         if (dev_priv->swaps_pending >= 100) {
539                 DRM_DEBUG("Too many swaps queued\n");
540                 return -EBUSY;
541         }
542
543         vbl_swap = drm_calloc(1, sizeof(*vbl_swap), DRM_MEM_DRIVER);
544
545         if (!vbl_swap) {
546                 DRM_ERROR("Failed to allocate memory to queue swap\n");
547                 return -ENOMEM;
548         }
549
550         DRM_DEBUG("\n");
551
552         vbl_swap->drw_id = swap->drawable;
553         vbl_swap->pipe = pipe;
554         vbl_swap->sequence = swap->sequence;
555
556         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
557
558         list_add_tail(&vbl_swap->head, &dev_priv->vbl_swaps.head);
559         dev_priv->swaps_pending++;
560
561         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
562
563         return 0;
564 }
565
566 /* drm_dma.h hooks
567 */
568 void i915_driver_irq_preinstall(struct drm_device * dev)
569 {
570         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
571
572         I915_WRITE16(I915REG_HWSTAM, 0xfffe);
573         I915_WRITE16(I915REG_INT_MASK_R, 0x0);
574         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
575 }
576
577 void i915_driver_irq_postinstall(struct drm_device * dev)
578 {
579         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
580
581         spin_lock_init(&dev_priv->swaps_lock);
582         INIT_LIST_HEAD(&dev_priv->vbl_swaps.head);
583         dev_priv->swaps_pending = 0;
584
585         if (!dev_priv->vblank_pipe)
586                 dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A;
587         i915_enable_interrupt(dev);
588         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
589 }
590
591 void i915_driver_irq_uninstall(struct drm_device * dev)
592 {
593         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
594         u16 temp;
595
596         if (!dev_priv)
597                 return;
598
599         I915_WRITE16(I915REG_HWSTAM, 0xffff);
600         I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
601         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
602
603         temp = I915_READ16(I915REG_INT_IDENTITY_R);
604         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
605 }