1 /* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
4 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
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:
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
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.
34 #define USER_INT_FLAG (1<<1)
35 #define VSYNC_PIPEB_FLAG (1<<5)
36 #define VSYNC_PIPEA_FLAG (1<<7)
38 #define MAX_NOPID ((u32)~0)
41 * Emit blits for scheduled buffer swaps.
43 * This function will be called with the HW lock held.
45 static void i915_vblank_tasklet(struct drm_device
*dev
)
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);
66 INIT_LIST_HEAD(&hits
);
70 spin_lock_irqsave(&dev_priv
->swaps_lock
, irqflags
);
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
);
77 if ((counter
[vbl_swap
->pipe
] - vbl_swap
->sequence
) > (1<<23))
81 dev_priv
->swaps_pending
--;
83 spin_unlock(&dev_priv
->swaps_lock
);
84 spin_lock(&dev
->drw_lock
);
86 drw
= drm_get_drawable_info(dev
, vbl_swap
->drw_id
);
89 spin_unlock(&dev
->drw_lock
);
90 drm_free(vbl_swap
, sizeof(*vbl_swap
), DRM_MEM_DRIVER
);
91 spin_lock(&dev_priv
->swaps_lock
);
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
);
102 drw_cmp
->rects
[0].y1
> drw
->rects
[0].y1
) {
103 list_add_tail(list
, hit
);
108 spin_unlock(&dev
->drw_lock
);
110 /* List of hits was empty, or we reached the end of it */
112 list_add_tail(list
, hits
.prev
);
116 spin_lock(&dev_priv
->swaps_lock
);
120 spin_unlock_irqrestore(&dev_priv
->swaps_lock
, irqflags
);
124 spin_unlock(&dev_priv
->swaps_lock
);
126 i915_kernel_lost_context(dev
);
131 OUT_RING(GFX_OP_DRAWRECT_INFO_I965
);
133 OUT_RING(((sarea_priv
->width
- 1) & 0xffff) | ((sarea_priv
->height
- 1) << 16));
139 OUT_RING(GFX_OP_DRAWRECT_INFO
);
142 OUT_RING(sarea_priv
->width
| sarea_priv
->height
<< 16);
143 OUT_RING(sarea_priv
->width
| sarea_priv
->height
<< 16);
149 sarea_priv
->ctxOwner
= DRM_KERNEL_CONTEXT
;
151 upper
[0] = upper
[1] = 0;
152 slice
[0] = max(sarea_priv
->pipeA_h
/ nhits
, 1);
153 slice
[1] = max(sarea_priv
->pipeB_h
/ nhits
, 1);
154 lower
[0] = sarea_priv
->pipeA_y
+ slice
[0];
155 lower
[1] = sarea_priv
->pipeB_y
+ slice
[0];
157 spin_lock(&dev
->drw_lock
);
159 /* Emit blits for buffer swaps, partitioning both outputs into as many
160 * slices as there are buffer swaps scheduled in order to avoid tearing
161 * (based on the assumption that a single buffer swap would always
162 * complete before scanout starts).
164 for (i
= 0; i
++ < nhits
;
165 upper
[0] = lower
[0], lower
[0] += slice
[0],
166 upper
[1] = lower
[1], lower
[1] += slice
[1]) {
168 lower
[0] = lower
[1] = sarea_priv
->height
;
170 list_for_each(hit
, &hits
) {
171 drm_i915_vbl_swap_t
*swap_hit
=
172 list_entry(hit
, drm_i915_vbl_swap_t
, head
);
173 struct drm_clip_rect
*rect
;
175 unsigned short top
, bottom
;
177 drw
= drm_get_drawable_info(dev
, swap_hit
->drw_id
);
183 pipe
= swap_hit
->pipe
;
185 bottom
= lower
[pipe
];
187 for (num_rects
= drw
->num_rects
; num_rects
--; rect
++) {
188 int y1
= max(rect
->y1
, top
);
189 int y2
= min(rect
->y2
, bottom
);
197 OUT_RING(pitchropcpp
);
198 OUT_RING((y1
<< 16) | rect
->x1
);
199 OUT_RING((y2
<< 16) | rect
->x2
);
200 OUT_RING(sarea_priv
->front_offset
);
201 OUT_RING((y1
<< 16) | rect
->x1
);
202 OUT_RING(pitchropcpp
& 0xffff);
203 OUT_RING(sarea_priv
->back_offset
);
210 spin_unlock_irqrestore(&dev
->drw_lock
, irqflags
);
212 list_for_each_safe(hit
, tmp
, &hits
) {
213 drm_i915_vbl_swap_t
*swap_hit
=
214 list_entry(hit
, drm_i915_vbl_swap_t
, head
);
218 drm_free(swap_hit
, sizeof(*swap_hit
), DRM_MEM_DRIVER
);
222 irqreturn_t
i915_driver_irq_handler(DRM_IRQ_ARGS
)
224 struct drm_device
*dev
= (struct drm_device
*) arg
;
225 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
227 u32 pipea_stats
, pipeb_stats
;
229 pipea_stats
= I915_READ(I915REG_PIPEASTAT
);
230 pipeb_stats
= I915_READ(I915REG_PIPEBSTAT
);
232 temp
= I915_READ16(I915REG_INT_IDENTITY_R
);
234 temp
&= (USER_INT_FLAG
| VSYNC_PIPEA_FLAG
| VSYNC_PIPEB_FLAG
);
236 DRM_DEBUG("%s flag=%08x\n", __FUNCTION__
, temp
);
241 I915_WRITE16(I915REG_INT_IDENTITY_R
, temp
);
242 (void) I915_READ16(I915REG_INT_IDENTITY_R
);
243 DRM_READMEMORYBARRIER();
245 dev_priv
->sarea_priv
->last_dispatch
= READ_BREADCRUMB(dev_priv
);
247 if (temp
& USER_INT_FLAG
)
248 DRM_WAKEUP(&dev_priv
->irq_queue
);
250 if (temp
& (VSYNC_PIPEA_FLAG
| VSYNC_PIPEB_FLAG
)) {
251 int vblank_pipe
= dev_priv
->vblank_pipe
;
254 (DRM_I915_VBLANK_PIPE_A
| DRM_I915_VBLANK_PIPE_B
))
255 == (DRM_I915_VBLANK_PIPE_A
| DRM_I915_VBLANK_PIPE_B
)) {
256 if (temp
& VSYNC_PIPEA_FLAG
)
257 atomic_inc(&dev
->vbl_received
);
258 if (temp
& VSYNC_PIPEB_FLAG
)
259 atomic_inc(&dev
->vbl_received2
);
260 } else if (((temp
& VSYNC_PIPEA_FLAG
) &&
261 (vblank_pipe
& DRM_I915_VBLANK_PIPE_A
)) ||
262 ((temp
& VSYNC_PIPEB_FLAG
) &&
263 (vblank_pipe
& DRM_I915_VBLANK_PIPE_B
)))
264 atomic_inc(&dev
->vbl_received
);
266 DRM_WAKEUP(&dev
->vbl_queue
);
267 drm_vbl_send_signals(dev
);
269 if (dev_priv
->swaps_pending
> 0)
270 drm_locked_tasklet(dev
, i915_vblank_tasklet
);
271 I915_WRITE(I915REG_PIPEASTAT
,
272 pipea_stats
|I915_VBLANK_INTERRUPT_ENABLE
|
274 I915_WRITE(I915REG_PIPEBSTAT
,
275 pipeb_stats
|I915_VBLANK_INTERRUPT_ENABLE
|
282 static int i915_emit_irq(struct drm_device
* dev
)
284 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
287 i915_kernel_lost_context(dev
);
291 dev_priv
->sarea_priv
->last_enqueue
= ++dev_priv
->counter
;
293 if (dev_priv
->counter
> 0x7FFFFFFFUL
)
294 dev_priv
->sarea_priv
->last_enqueue
= dev_priv
->counter
= 1;
297 OUT_RING(CMD_STORE_DWORD_IDX
);
299 OUT_RING(dev_priv
->counter
);
302 OUT_RING(GFX_OP_USER_INTERRUPT
);
305 return dev_priv
->counter
;
308 static int i915_wait_irq(struct drm_device
* dev
, int irq_nr
)
310 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
313 DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr
,
314 READ_BREADCRUMB(dev_priv
));
316 if (READ_BREADCRUMB(dev_priv
) >= irq_nr
)
319 dev_priv
->sarea_priv
->perf_boxes
|= I915_BOX_WAIT
;
321 DRM_WAIT_ON(ret
, dev_priv
->irq_queue
, 3 * DRM_HZ
,
322 READ_BREADCRUMB(dev_priv
) >= irq_nr
);
325 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
326 READ_BREADCRUMB(dev_priv
), (int)dev_priv
->counter
);
329 dev_priv
->sarea_priv
->last_dispatch
= READ_BREADCRUMB(dev_priv
);
333 static int i915_driver_vblank_do_wait(struct drm_device
*dev
, unsigned int *sequence
,
336 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
337 unsigned int cur_vblank
;
341 DRM_ERROR("called with no initialization\n");
345 DRM_WAIT_ON(ret
, dev
->vbl_queue
, 3 * DRM_HZ
,
346 (((cur_vblank
= atomic_read(counter
))
347 - *sequence
) <= (1<<23)));
349 *sequence
= cur_vblank
;
355 int i915_driver_vblank_wait(struct drm_device
*dev
, unsigned int *sequence
)
357 return i915_driver_vblank_do_wait(dev
, sequence
, &dev
->vbl_received
);
360 int i915_driver_vblank_wait2(struct drm_device
*dev
, unsigned int *sequence
)
362 return i915_driver_vblank_do_wait(dev
, sequence
, &dev
->vbl_received2
);
365 /* Needs the lock as it touches the ring.
367 int i915_irq_emit(struct drm_device
*dev
, void *data
,
368 struct drm_file
*file_priv
)
370 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
371 drm_i915_irq_emit_t
*emit
= data
;
374 LOCK_TEST_WITH_RETURN(dev
, file_priv
);
377 DRM_ERROR("called with no initialization\n");
381 result
= i915_emit_irq(dev
);
383 if (DRM_COPY_TO_USER(emit
->irq_seq
, &result
, sizeof(int))) {
384 DRM_ERROR("copy_to_user\n");
391 /* Doesn't need the hardware lock.
393 int i915_irq_wait(struct drm_device
*dev
, void *data
,
394 struct drm_file
*file_priv
)
396 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
397 drm_i915_irq_wait_t
*irqwait
= data
;
400 DRM_ERROR("called with no initialization\n");
404 return i915_wait_irq(dev
, irqwait
->irq_seq
);
407 static void i915_enable_interrupt (struct drm_device
*dev
)
409 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
413 if (dev_priv
->vblank_pipe
& DRM_I915_VBLANK_PIPE_A
)
414 flag
|= VSYNC_PIPEA_FLAG
;
415 if (dev_priv
->vblank_pipe
& DRM_I915_VBLANK_PIPE_B
)
416 flag
|= VSYNC_PIPEB_FLAG
;
418 I915_WRITE16(I915REG_INT_ENABLE_R
, USER_INT_FLAG
| flag
);
421 /* Set the vblank monitor pipe
423 int i915_vblank_pipe_set(struct drm_device
*dev
, void *data
,
424 struct drm_file
*file_priv
)
426 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
427 drm_i915_vblank_pipe_t
*pipe
= data
;
430 DRM_ERROR("called with no initialization\n");
434 if (pipe
->pipe
& ~(DRM_I915_VBLANK_PIPE_A
|DRM_I915_VBLANK_PIPE_B
)) {
435 DRM_ERROR("called with invalid pipe 0x%x\n", pipe
->pipe
);
439 dev_priv
->vblank_pipe
= pipe
->pipe
;
441 i915_enable_interrupt (dev
);
446 int i915_vblank_pipe_get(struct drm_device
*dev
, void *data
,
447 struct drm_file
*file_priv
)
449 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
450 drm_i915_vblank_pipe_t
*pipe
= data
;
454 DRM_ERROR("called with no initialization\n");
458 flag
= I915_READ(I915REG_INT_ENABLE_R
);
460 if (flag
& VSYNC_PIPEA_FLAG
)
461 pipe
->pipe
|= DRM_I915_VBLANK_PIPE_A
;
462 if (flag
& VSYNC_PIPEB_FLAG
)
463 pipe
->pipe
|= DRM_I915_VBLANK_PIPE_B
;
469 * Schedule buffer swap at given vertical blank.
471 int i915_vblank_swap(struct drm_device
*dev
, void *data
,
472 struct drm_file
*file_priv
)
474 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
475 drm_i915_vblank_swap_t
*swap
= data
;
476 drm_i915_vbl_swap_t
*vbl_swap
;
477 unsigned int pipe
, seqtype
, curseq
;
478 unsigned long irqflags
;
479 struct list_head
*list
;
482 DRM_ERROR("%s called with no initialization\n", __func__
);
486 if (dev_priv
->sarea_priv
->rotation
) {
487 DRM_DEBUG("Rotation not supported\n");
491 if (swap
->seqtype
& ~(_DRM_VBLANK_RELATIVE
| _DRM_VBLANK_ABSOLUTE
|
492 _DRM_VBLANK_SECONDARY
| _DRM_VBLANK_NEXTONMISS
)) {
493 DRM_ERROR("Invalid sequence type 0x%x\n", swap
->seqtype
);
497 pipe
= (swap
->seqtype
& _DRM_VBLANK_SECONDARY
) ? 1 : 0;
499 seqtype
= swap
->seqtype
& (_DRM_VBLANK_RELATIVE
| _DRM_VBLANK_ABSOLUTE
);
501 if (!(dev_priv
->vblank_pipe
& (1 << pipe
))) {
502 DRM_ERROR("Invalid pipe %d\n", pipe
);
506 spin_lock_irqsave(&dev
->drw_lock
, irqflags
);
508 if (!drm_get_drawable_info(dev
, swap
->drawable
)) {
509 spin_unlock_irqrestore(&dev
->drw_lock
, irqflags
);
510 DRM_DEBUG("Invalid drawable ID %d\n", swap
->drawable
);
514 spin_unlock_irqrestore(&dev
->drw_lock
, irqflags
);
516 curseq
= atomic_read(pipe
? &dev
->vbl_received2
: &dev
->vbl_received
);
518 if (seqtype
== _DRM_VBLANK_RELATIVE
)
519 swap
->sequence
+= curseq
;
521 if ((curseq
- swap
->sequence
) <= (1<<23)) {
522 if (swap
->seqtype
& _DRM_VBLANK_NEXTONMISS
) {
523 swap
->sequence
= curseq
+ 1;
525 DRM_DEBUG("Missed target sequence\n");
530 spin_lock_irqsave(&dev_priv
->swaps_lock
, irqflags
);
532 list_for_each(list
, &dev_priv
->vbl_swaps
.head
) {
533 vbl_swap
= list_entry(list
, drm_i915_vbl_swap_t
, head
);
535 if (vbl_swap
->drw_id
== swap
->drawable
&&
536 vbl_swap
->pipe
== pipe
&&
537 vbl_swap
->sequence
== swap
->sequence
) {
538 spin_unlock_irqrestore(&dev_priv
->swaps_lock
, irqflags
);
539 DRM_DEBUG("Already scheduled\n");
544 spin_unlock_irqrestore(&dev_priv
->swaps_lock
, irqflags
);
546 if (dev_priv
->swaps_pending
>= 100) {
547 DRM_DEBUG("Too many swaps queued\n");
551 vbl_swap
= drm_calloc(1, sizeof(*vbl_swap
), DRM_MEM_DRIVER
);
554 DRM_ERROR("Failed to allocate memory to queue swap\n");
560 vbl_swap
->drw_id
= swap
->drawable
;
561 vbl_swap
->pipe
= pipe
;
562 vbl_swap
->sequence
= swap
->sequence
;
564 spin_lock_irqsave(&dev_priv
->swaps_lock
, irqflags
);
566 list_add_tail(&vbl_swap
->head
, &dev_priv
->vbl_swaps
.head
);
567 dev_priv
->swaps_pending
++;
569 spin_unlock_irqrestore(&dev_priv
->swaps_lock
, irqflags
);
576 void i915_driver_irq_preinstall(struct drm_device
* dev
)
578 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
580 I915_WRITE16(I915REG_HWSTAM
, 0xfffe);
581 I915_WRITE16(I915REG_INT_MASK_R
, 0x0);
582 I915_WRITE16(I915REG_INT_ENABLE_R
, 0x0);
585 void i915_driver_irq_postinstall(struct drm_device
* dev
)
587 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
589 spin_lock_init(&dev_priv
->swaps_lock
);
590 INIT_LIST_HEAD(&dev_priv
->vbl_swaps
.head
);
591 dev_priv
->swaps_pending
= 0;
593 if (!dev_priv
->vblank_pipe
)
594 dev_priv
->vblank_pipe
= DRM_I915_VBLANK_PIPE_A
;
595 i915_enable_interrupt(dev
);
596 DRM_INIT_WAITQUEUE(&dev_priv
->irq_queue
);
599 void i915_driver_irq_uninstall(struct drm_device
* dev
)
601 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
607 I915_WRITE16(I915REG_HWSTAM
, 0xffff);
608 I915_WRITE16(I915REG_INT_MASK_R
, 0xffff);
609 I915_WRITE16(I915REG_INT_ENABLE_R
, 0x0);
611 temp
= I915_READ16(I915REG_INT_IDENTITY_R
);
612 I915_WRITE16(I915REG_INT_IDENTITY_R
, temp
);