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 src_pitch
= sarea_priv
->pitch
* cpp
;
61 u32 dst_pitch
= sarea_priv
->pitch
* cpp
;
62 u32 ropcpp
= (0xcc << 16) | ((cpp
- 1) << 24);
65 if (sarea_priv
->front_tiled
) {
66 cmd
|= XY_SRC_COPY_BLT_DST_TILED
;
69 if (sarea_priv
->back_tiled
) {
70 cmd
|= XY_SRC_COPY_BLT_SRC_TILED
;
76 INIT_LIST_HEAD(&hits
);
80 spin_lock_irqsave(&dev_priv
->swaps_lock
, irqflags
);
82 /* Find buffer swaps scheduled for this vertical blank */
83 list_for_each_safe(list
, tmp
, &dev_priv
->vbl_swaps
.head
) {
84 drm_i915_vbl_swap_t
*vbl_swap
=
85 list_entry(list
, drm_i915_vbl_swap_t
, head
);
87 if ((counter
[vbl_swap
->pipe
] - vbl_swap
->sequence
) > (1<<23))
91 dev_priv
->swaps_pending
--;
93 spin_unlock(&dev_priv
->swaps_lock
);
94 spin_lock(&dev
->drw_lock
);
96 drw
= drm_get_drawable_info(dev
, vbl_swap
->drw_id
);
99 spin_unlock(&dev
->drw_lock
);
100 drm_free(vbl_swap
, sizeof(*vbl_swap
), DRM_MEM_DRIVER
);
101 spin_lock(&dev_priv
->swaps_lock
);
105 list_for_each(hit
, &hits
) {
106 drm_i915_vbl_swap_t
*swap_cmp
=
107 list_entry(hit
, drm_i915_vbl_swap_t
, head
);
108 struct drm_drawable_info
*drw_cmp
=
109 drm_get_drawable_info(dev
, swap_cmp
->drw_id
);
112 drw_cmp
->rects
[0].y1
> drw
->rects
[0].y1
) {
113 list_add_tail(list
, hit
);
118 spin_unlock(&dev
->drw_lock
);
120 /* List of hits was empty, or we reached the end of it */
122 list_add_tail(list
, hits
.prev
);
126 spin_lock(&dev_priv
->swaps_lock
);
130 spin_unlock_irqrestore(&dev_priv
->swaps_lock
, irqflags
);
134 spin_unlock(&dev_priv
->swaps_lock
);
136 i915_kernel_lost_context(dev
);
141 OUT_RING(GFX_OP_DRAWRECT_INFO_I965
);
143 OUT_RING(((sarea_priv
->width
- 1) & 0xffff) | ((sarea_priv
->height
- 1) << 16));
149 OUT_RING(GFX_OP_DRAWRECT_INFO
);
152 OUT_RING(sarea_priv
->width
| sarea_priv
->height
<< 16);
153 OUT_RING(sarea_priv
->width
| sarea_priv
->height
<< 16);
159 sarea_priv
->ctxOwner
= DRM_KERNEL_CONTEXT
;
161 upper
[0] = upper
[1] = 0;
162 slice
[0] = max(sarea_priv
->pipeA_h
/ nhits
, 1);
163 slice
[1] = max(sarea_priv
->pipeB_h
/ nhits
, 1);
164 lower
[0] = sarea_priv
->pipeA_y
+ slice
[0];
165 lower
[1] = sarea_priv
->pipeB_y
+ slice
[0];
167 spin_lock(&dev
->drw_lock
);
169 /* Emit blits for buffer swaps, partitioning both outputs into as many
170 * slices as there are buffer swaps scheduled in order to avoid tearing
171 * (based on the assumption that a single buffer swap would always
172 * complete before scanout starts).
174 for (i
= 0; i
++ < nhits
;
175 upper
[0] = lower
[0], lower
[0] += slice
[0],
176 upper
[1] = lower
[1], lower
[1] += slice
[1]) {
178 lower
[0] = lower
[1] = sarea_priv
->height
;
180 list_for_each(hit
, &hits
) {
181 drm_i915_vbl_swap_t
*swap_hit
=
182 list_entry(hit
, drm_i915_vbl_swap_t
, head
);
183 struct drm_clip_rect
*rect
;
185 unsigned short top
, bottom
;
187 drw
= drm_get_drawable_info(dev
, swap_hit
->drw_id
);
193 pipe
= swap_hit
->pipe
;
195 bottom
= lower
[pipe
];
197 for (num_rects
= drw
->num_rects
; num_rects
--; rect
++) {
198 int y1
= max(rect
->y1
, top
);
199 int y2
= min(rect
->y2
, bottom
);
207 OUT_RING(ropcpp
| dst_pitch
);
208 OUT_RING((y1
<< 16) | rect
->x1
);
209 OUT_RING((y2
<< 16) | rect
->x2
);
210 OUT_RING(sarea_priv
->front_offset
);
211 OUT_RING((y1
<< 16) | rect
->x1
);
213 OUT_RING(sarea_priv
->back_offset
);
220 spin_unlock_irqrestore(&dev
->drw_lock
, irqflags
);
222 list_for_each_safe(hit
, tmp
, &hits
) {
223 drm_i915_vbl_swap_t
*swap_hit
=
224 list_entry(hit
, drm_i915_vbl_swap_t
, head
);
228 drm_free(swap_hit
, sizeof(*swap_hit
), DRM_MEM_DRIVER
);
232 irqreturn_t
i915_driver_irq_handler(DRM_IRQ_ARGS
)
234 struct drm_device
*dev
= (struct drm_device
*) arg
;
235 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
237 u32 pipea_stats
, pipeb_stats
;
239 pipea_stats
= I915_READ(I915REG_PIPEASTAT
);
240 pipeb_stats
= I915_READ(I915REG_PIPEBSTAT
);
242 temp
= I915_READ16(I915REG_INT_IDENTITY_R
);
244 temp
&= (USER_INT_FLAG
| VSYNC_PIPEA_FLAG
| VSYNC_PIPEB_FLAG
);
246 DRM_DEBUG("%s flag=%08x\n", __FUNCTION__
, temp
);
251 I915_WRITE16(I915REG_INT_IDENTITY_R
, temp
);
252 (void) I915_READ16(I915REG_INT_IDENTITY_R
);
253 DRM_READMEMORYBARRIER();
255 dev_priv
->sarea_priv
->last_dispatch
= READ_BREADCRUMB(dev_priv
);
257 if (temp
& USER_INT_FLAG
)
258 DRM_WAKEUP(&dev_priv
->irq_queue
);
260 if (temp
& (VSYNC_PIPEA_FLAG
| VSYNC_PIPEB_FLAG
)) {
261 int vblank_pipe
= dev_priv
->vblank_pipe
;
264 (DRM_I915_VBLANK_PIPE_A
| DRM_I915_VBLANK_PIPE_B
))
265 == (DRM_I915_VBLANK_PIPE_A
| DRM_I915_VBLANK_PIPE_B
)) {
266 if (temp
& VSYNC_PIPEA_FLAG
)
267 atomic_inc(&dev
->vbl_received
);
268 if (temp
& VSYNC_PIPEB_FLAG
)
269 atomic_inc(&dev
->vbl_received2
);
270 } else if (((temp
& VSYNC_PIPEA_FLAG
) &&
271 (vblank_pipe
& DRM_I915_VBLANK_PIPE_A
)) ||
272 ((temp
& VSYNC_PIPEB_FLAG
) &&
273 (vblank_pipe
& DRM_I915_VBLANK_PIPE_B
)))
274 atomic_inc(&dev
->vbl_received
);
276 DRM_WAKEUP(&dev
->vbl_queue
);
277 drm_vbl_send_signals(dev
);
279 if (dev_priv
->swaps_pending
> 0)
280 drm_locked_tasklet(dev
, i915_vblank_tasklet
);
281 I915_WRITE(I915REG_PIPEASTAT
,
282 pipea_stats
|I915_VBLANK_INTERRUPT_ENABLE
|
284 I915_WRITE(I915REG_PIPEBSTAT
,
285 pipeb_stats
|I915_VBLANK_INTERRUPT_ENABLE
|
292 static int i915_emit_irq(struct drm_device
* dev
)
294 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
297 i915_kernel_lost_context(dev
);
301 dev_priv
->sarea_priv
->last_enqueue
= ++dev_priv
->counter
;
303 if (dev_priv
->counter
> 0x7FFFFFFFUL
)
304 dev_priv
->sarea_priv
->last_enqueue
= dev_priv
->counter
= 1;
307 OUT_RING(CMD_STORE_DWORD_IDX
);
309 OUT_RING(dev_priv
->counter
);
312 OUT_RING(GFX_OP_USER_INTERRUPT
);
315 return dev_priv
->counter
;
318 static int i915_wait_irq(struct drm_device
* dev
, int irq_nr
)
320 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
323 DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr
,
324 READ_BREADCRUMB(dev_priv
));
326 if (READ_BREADCRUMB(dev_priv
) >= irq_nr
)
329 dev_priv
->sarea_priv
->perf_boxes
|= I915_BOX_WAIT
;
331 DRM_WAIT_ON(ret
, dev_priv
->irq_queue
, 3 * DRM_HZ
,
332 READ_BREADCRUMB(dev_priv
) >= irq_nr
);
335 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
336 READ_BREADCRUMB(dev_priv
), (int)dev_priv
->counter
);
339 dev_priv
->sarea_priv
->last_dispatch
= READ_BREADCRUMB(dev_priv
);
343 static int i915_driver_vblank_do_wait(struct drm_device
*dev
, unsigned int *sequence
,
346 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
347 unsigned int cur_vblank
;
351 DRM_ERROR("called with no initialization\n");
355 DRM_WAIT_ON(ret
, dev
->vbl_queue
, 3 * DRM_HZ
,
356 (((cur_vblank
= atomic_read(counter
))
357 - *sequence
) <= (1<<23)));
359 *sequence
= cur_vblank
;
365 int i915_driver_vblank_wait(struct drm_device
*dev
, unsigned int *sequence
)
367 return i915_driver_vblank_do_wait(dev
, sequence
, &dev
->vbl_received
);
370 int i915_driver_vblank_wait2(struct drm_device
*dev
, unsigned int *sequence
)
372 return i915_driver_vblank_do_wait(dev
, sequence
, &dev
->vbl_received2
);
375 /* Needs the lock as it touches the ring.
377 int i915_irq_emit(struct drm_device
*dev
, void *data
,
378 struct drm_file
*file_priv
)
380 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
381 drm_i915_irq_emit_t
*emit
= data
;
384 LOCK_TEST_WITH_RETURN(dev
, file_priv
);
387 DRM_ERROR("called with no initialization\n");
391 result
= i915_emit_irq(dev
);
393 if (DRM_COPY_TO_USER(emit
->irq_seq
, &result
, sizeof(int))) {
394 DRM_ERROR("copy_to_user\n");
401 /* Doesn't need the hardware lock.
403 int i915_irq_wait(struct drm_device
*dev
, void *data
,
404 struct drm_file
*file_priv
)
406 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
407 drm_i915_irq_wait_t
*irqwait
= data
;
410 DRM_ERROR("called with no initialization\n");
414 return i915_wait_irq(dev
, irqwait
->irq_seq
);
417 static void i915_enable_interrupt (struct drm_device
*dev
)
419 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
423 if (dev_priv
->vblank_pipe
& DRM_I915_VBLANK_PIPE_A
)
424 flag
|= VSYNC_PIPEA_FLAG
;
425 if (dev_priv
->vblank_pipe
& DRM_I915_VBLANK_PIPE_B
)
426 flag
|= VSYNC_PIPEB_FLAG
;
428 I915_WRITE16(I915REG_INT_ENABLE_R
, USER_INT_FLAG
| flag
);
431 /* Set the vblank monitor pipe
433 int i915_vblank_pipe_set(struct drm_device
*dev
, void *data
,
434 struct drm_file
*file_priv
)
436 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
437 drm_i915_vblank_pipe_t
*pipe
= data
;
440 DRM_ERROR("called with no initialization\n");
444 if (pipe
->pipe
& ~(DRM_I915_VBLANK_PIPE_A
|DRM_I915_VBLANK_PIPE_B
)) {
445 DRM_ERROR("called with invalid pipe 0x%x\n", pipe
->pipe
);
449 dev_priv
->vblank_pipe
= pipe
->pipe
;
451 i915_enable_interrupt (dev
);
456 int i915_vblank_pipe_get(struct drm_device
*dev
, void *data
,
457 struct drm_file
*file_priv
)
459 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
460 drm_i915_vblank_pipe_t
*pipe
= data
;
464 DRM_ERROR("called with no initialization\n");
468 flag
= I915_READ(I915REG_INT_ENABLE_R
);
470 if (flag
& VSYNC_PIPEA_FLAG
)
471 pipe
->pipe
|= DRM_I915_VBLANK_PIPE_A
;
472 if (flag
& VSYNC_PIPEB_FLAG
)
473 pipe
->pipe
|= DRM_I915_VBLANK_PIPE_B
;
479 * Schedule buffer swap at given vertical blank.
481 int i915_vblank_swap(struct drm_device
*dev
, void *data
,
482 struct drm_file
*file_priv
)
484 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
485 drm_i915_vblank_swap_t
*swap
= data
;
486 drm_i915_vbl_swap_t
*vbl_swap
;
487 unsigned int pipe
, seqtype
, curseq
;
488 unsigned long irqflags
;
489 struct list_head
*list
;
492 DRM_ERROR("%s called with no initialization\n", __func__
);
496 if (dev_priv
->sarea_priv
->rotation
) {
497 DRM_DEBUG("Rotation not supported\n");
501 if (swap
->seqtype
& ~(_DRM_VBLANK_RELATIVE
| _DRM_VBLANK_ABSOLUTE
|
502 _DRM_VBLANK_SECONDARY
| _DRM_VBLANK_NEXTONMISS
)) {
503 DRM_ERROR("Invalid sequence type 0x%x\n", swap
->seqtype
);
507 pipe
= (swap
->seqtype
& _DRM_VBLANK_SECONDARY
) ? 1 : 0;
509 seqtype
= swap
->seqtype
& (_DRM_VBLANK_RELATIVE
| _DRM_VBLANK_ABSOLUTE
);
511 if (!(dev_priv
->vblank_pipe
& (1 << pipe
))) {
512 DRM_ERROR("Invalid pipe %d\n", pipe
);
516 spin_lock_irqsave(&dev
->drw_lock
, irqflags
);
518 if (!drm_get_drawable_info(dev
, swap
->drawable
)) {
519 spin_unlock_irqrestore(&dev
->drw_lock
, irqflags
);
520 DRM_DEBUG("Invalid drawable ID %d\n", swap
->drawable
);
524 spin_unlock_irqrestore(&dev
->drw_lock
, irqflags
);
526 curseq
= atomic_read(pipe
? &dev
->vbl_received2
: &dev
->vbl_received
);
528 if (seqtype
== _DRM_VBLANK_RELATIVE
)
529 swap
->sequence
+= curseq
;
531 if ((curseq
- swap
->sequence
) <= (1<<23)) {
532 if (swap
->seqtype
& _DRM_VBLANK_NEXTONMISS
) {
533 swap
->sequence
= curseq
+ 1;
535 DRM_DEBUG("Missed target sequence\n");
540 spin_lock_irqsave(&dev_priv
->swaps_lock
, irqflags
);
542 list_for_each(list
, &dev_priv
->vbl_swaps
.head
) {
543 vbl_swap
= list_entry(list
, drm_i915_vbl_swap_t
, head
);
545 if (vbl_swap
->drw_id
== swap
->drawable
&&
546 vbl_swap
->pipe
== pipe
&&
547 vbl_swap
->sequence
== swap
->sequence
) {
548 spin_unlock_irqrestore(&dev_priv
->swaps_lock
, irqflags
);
549 DRM_DEBUG("Already scheduled\n");
554 spin_unlock_irqrestore(&dev_priv
->swaps_lock
, irqflags
);
556 if (dev_priv
->swaps_pending
>= 100) {
557 DRM_DEBUG("Too many swaps queued\n");
561 vbl_swap
= drm_calloc(1, sizeof(*vbl_swap
), DRM_MEM_DRIVER
);
564 DRM_ERROR("Failed to allocate memory to queue swap\n");
570 vbl_swap
->drw_id
= swap
->drawable
;
571 vbl_swap
->pipe
= pipe
;
572 vbl_swap
->sequence
= swap
->sequence
;
574 spin_lock_irqsave(&dev_priv
->swaps_lock
, irqflags
);
576 list_add_tail(&vbl_swap
->head
, &dev_priv
->vbl_swaps
.head
);
577 dev_priv
->swaps_pending
++;
579 spin_unlock_irqrestore(&dev_priv
->swaps_lock
, irqflags
);
586 void i915_driver_irq_preinstall(struct drm_device
* dev
)
588 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
590 I915_WRITE16(I915REG_HWSTAM
, 0xfffe);
591 I915_WRITE16(I915REG_INT_MASK_R
, 0x0);
592 I915_WRITE16(I915REG_INT_ENABLE_R
, 0x0);
595 void i915_driver_irq_postinstall(struct drm_device
* dev
)
597 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
599 spin_lock_init(&dev_priv
->swaps_lock
);
600 INIT_LIST_HEAD(&dev_priv
->vbl_swaps
.head
);
601 dev_priv
->swaps_pending
= 0;
603 if (!dev_priv
->vblank_pipe
)
604 dev_priv
->vblank_pipe
= DRM_I915_VBLANK_PIPE_A
;
605 i915_enable_interrupt(dev
);
606 DRM_INIT_WAITQUEUE(&dev_priv
->irq_queue
);
609 void i915_driver_irq_uninstall(struct drm_device
* dev
)
611 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
617 I915_WRITE16(I915REG_HWSTAM
, 0xffff);
618 I915_WRITE16(I915REG_INT_MASK_R
, 0xffff);
619 I915_WRITE16(I915REG_INT_ENABLE_R
, 0x0);
621 temp
= I915_READ16(I915REG_INT_IDENTITY_R
);
622 I915_WRITE16(I915REG_INT_IDENTITY_R
, temp
);