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.
33 #include "intel_drv.h"
35 #define MAX_NOPID ((u32)~0)
38 * Interrupts that are always left unmasked.
40 * Since pipe events are edge-triggered from the PIPESTAT register to IIR,
41 * we leave them always unmasked in IMR and then control enabling them through
44 #define I915_INTERRUPT_ENABLE_FIX (I915_ASLE_INTERRUPT | \
45 I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | \
46 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT)
48 /** Interrupts that we mask and unmask at runtime. */
49 #define I915_INTERRUPT_ENABLE_VAR (I915_USER_INTERRUPT)
51 /** These are all of the interrupts used by the driver */
52 #define I915_INTERRUPT_ENABLE_MASK (I915_INTERRUPT_ENABLE_FIX | \
53 I915_INTERRUPT_ENABLE_VAR)
55 #define I915_PIPE_VBLANK_STATUS (PIPE_START_VBLANK_INTERRUPT_STATUS |\
56 PIPE_VBLANK_INTERRUPT_STATUS)
58 #define I915_PIPE_VBLANK_ENABLE (PIPE_START_VBLANK_INTERRUPT_ENABLE |\
59 PIPE_VBLANK_INTERRUPT_ENABLE)
61 #define DRM_I915_VBLANK_PIPE_ALL (DRM_I915_VBLANK_PIPE_A | \
62 DRM_I915_VBLANK_PIPE_B)
65 i915_enable_irq(drm_i915_private_t
*dev_priv
, u32 mask
)
67 if ((dev_priv
->irq_mask_reg
& mask
) != 0) {
68 dev_priv
->irq_mask_reg
&= ~mask
;
69 I915_WRITE(IMR
, dev_priv
->irq_mask_reg
);
70 (void) I915_READ(IMR
);
75 i915_disable_irq(drm_i915_private_t
*dev_priv
, u32 mask
)
77 if ((dev_priv
->irq_mask_reg
& mask
) != mask
) {
78 dev_priv
->irq_mask_reg
|= mask
;
79 I915_WRITE(IMR
, dev_priv
->irq_mask_reg
);
80 (void) I915_READ(IMR
);
85 i915_pipestat(int pipe
)
95 i915_enable_pipestat(drm_i915_private_t
*dev_priv
, int pipe
, u32 mask
)
97 if ((dev_priv
->pipestat
[pipe
] & mask
) != mask
) {
98 u32 reg
= i915_pipestat(pipe
);
100 dev_priv
->pipestat
[pipe
] |= mask
;
101 /* Enable the interrupt, clear any pending status */
102 I915_WRITE(reg
, dev_priv
->pipestat
[pipe
] | (mask
>> 16));
103 (void) I915_READ(reg
);
108 i915_disable_pipestat(drm_i915_private_t
*dev_priv
, int pipe
, u32 mask
)
110 if ((dev_priv
->pipestat
[pipe
] & mask
) != 0) {
111 u32 reg
= i915_pipestat(pipe
);
113 dev_priv
->pipestat
[pipe
] &= ~mask
;
114 I915_WRITE(reg
, dev_priv
->pipestat
[pipe
]);
115 (void) I915_READ(reg
);
120 * i915_pipe_enabled - check if a pipe is enabled
122 * @pipe: pipe to check
124 * Reading certain registers when the pipe is disabled can hang the chip.
125 * Use this routine to make sure the PLL is running and the pipe is active
126 * before reading such registers if unsure.
129 i915_pipe_enabled(struct drm_device
*dev
, int pipe
)
131 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
132 unsigned long pipeconf
= pipe
? PIPEBCONF
: PIPEACONF
;
134 if (I915_READ(pipeconf
) & PIPEACONF_ENABLE
)
140 /* Called from drm generic code, passed a 'crtc', which
141 * we use as a pipe index
143 u32
i915_get_vblank_counter(struct drm_device
*dev
, int pipe
)
145 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
146 unsigned long high_frame
;
147 unsigned long low_frame
;
148 u32 high1
, high2
, low
, count
;
150 high_frame
= pipe
? PIPEBFRAMEHIGH
: PIPEAFRAMEHIGH
;
151 low_frame
= pipe
? PIPEBFRAMEPIXEL
: PIPEAFRAMEPIXEL
;
153 if (!i915_pipe_enabled(dev
, pipe
)) {
154 DRM_ERROR("trying to get vblank count for disabled pipe %d\n", pipe
);
159 * High & low register fields aren't synchronized, so make sure
160 * we get a low value that's stable across two reads of the high
164 high1
= ((I915_READ(high_frame
) & PIPE_FRAME_HIGH_MASK
) >>
165 PIPE_FRAME_HIGH_SHIFT
);
166 low
= ((I915_READ(low_frame
) & PIPE_FRAME_LOW_MASK
) >>
167 PIPE_FRAME_LOW_SHIFT
);
168 high2
= ((I915_READ(high_frame
) & PIPE_FRAME_HIGH_MASK
) >>
169 PIPE_FRAME_HIGH_SHIFT
);
170 } while (high1
!= high2
);
172 count
= (high1
<< 8) | low
;
177 u32
gm45_get_vblank_counter(struct drm_device
*dev
, int pipe
)
179 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
180 int reg
= pipe
? PIPEB_FRMCOUNT_GM45
: PIPEA_FRMCOUNT_GM45
;
182 if (!i915_pipe_enabled(dev
, pipe
)) {
183 DRM_ERROR("trying to get vblank count for disabled pipe %d\n", pipe
);
187 return I915_READ(reg
);
190 irqreturn_t
i915_driver_irq_handler(DRM_IRQ_ARGS
)
192 struct drm_device
*dev
= (struct drm_device
*) arg
;
193 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
194 struct drm_i915_master_private
*master_priv
;
196 u32 pipea_stats
, pipeb_stats
;
200 unsigned long irqflags
;
204 atomic_inc(&dev_priv
->irq_received
);
206 iir
= I915_READ(IIR
);
209 vblank_status
= I915_START_VBLANK_INTERRUPT_STATUS
;
210 vblank_enable
= PIPE_START_VBLANK_INTERRUPT_ENABLE
;
212 vblank_status
= I915_VBLANK_INTERRUPT_STATUS
;
213 vblank_enable
= I915_VBLANK_INTERRUPT_ENABLE
;
217 irq_received
= iir
!= 0;
219 /* Can't rely on pipestat interrupt bit in iir as it might
220 * have been cleared after the pipestat interrupt was received.
221 * It doesn't set the bit in iir again, but it still produces
222 * interrupts (for non-MSI).
224 spin_lock_irqsave(&dev_priv
->user_irq_lock
, irqflags
);
225 pipea_stats
= I915_READ(PIPEASTAT
);
226 pipeb_stats
= I915_READ(PIPEBSTAT
);
229 * Clear the PIPE(A|B)STAT regs before the IIR
231 if (pipea_stats
& 0x8000ffff) {
232 I915_WRITE(PIPEASTAT
, pipea_stats
);
236 if (pipeb_stats
& 0x8000ffff) {
237 I915_WRITE(PIPEBSTAT
, pipeb_stats
);
240 spin_unlock_irqrestore(&dev_priv
->user_irq_lock
, irqflags
);
247 I915_WRITE(IIR
, iir
);
248 new_iir
= I915_READ(IIR
); /* Flush posted writes */
250 if (dev
->primary
->master
) {
251 master_priv
= dev
->primary
->master
->driver_priv
;
252 if (master_priv
->sarea_priv
)
253 master_priv
->sarea_priv
->last_dispatch
=
254 READ_BREADCRUMB(dev_priv
);
257 if (iir
& I915_USER_INTERRUPT
) {
258 dev_priv
->mm
.irq_gem_seqno
= i915_get_gem_seqno(dev
);
259 DRM_WAKEUP(&dev_priv
->irq_queue
);
262 if (pipea_stats
& vblank_status
) {
264 drm_handle_vblank(dev
, 0);
267 if (pipeb_stats
& vblank_status
) {
269 drm_handle_vblank(dev
, 1);
272 if ((pipeb_stats
& I915_LEGACY_BLC_EVENT_STATUS
) ||
273 (iir
& I915_ASLE_INTERRUPT
))
274 opregion_asle_intr(dev
);
276 /* With MSI, interrupts are only generated when iir
277 * transitions from zero to nonzero. If another bit got
278 * set while we were handling the existing iir bits, then
279 * we would never get another interrupt.
281 * This is fine on non-MSI as well, as if we hit this path
282 * we avoid exiting the interrupt handler only to generate
285 * Note that for MSI this could cause a stray interrupt report
286 * if an interrupt landed in the time between writing IIR and
287 * the posting read. This should be rare enough to never
288 * trigger the 99% of 100,000 interrupts test for disabling
297 static int i915_emit_irq(struct drm_device
* dev
)
299 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
300 struct drm_i915_master_private
*master_priv
= dev
->primary
->master
->driver_priv
;
303 i915_kernel_lost_context(dev
);
308 if (dev_priv
->counter
> 0x7FFFFFFFUL
)
309 dev_priv
->counter
= 1;
310 if (master_priv
->sarea_priv
)
311 master_priv
->sarea_priv
->last_enqueue
= dev_priv
->counter
;
314 OUT_RING(MI_STORE_DWORD_INDEX
);
315 OUT_RING(I915_BREADCRUMB_INDEX
<< MI_STORE_DWORD_INDEX_SHIFT
);
316 OUT_RING(dev_priv
->counter
);
317 OUT_RING(MI_USER_INTERRUPT
);
320 return dev_priv
->counter
;
323 void i915_user_irq_get(struct drm_device
*dev
)
325 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
326 unsigned long irqflags
;
328 spin_lock_irqsave(&dev_priv
->user_irq_lock
, irqflags
);
329 if (dev
->irq_enabled
&& (++dev_priv
->user_irq_refcount
== 1))
330 i915_enable_irq(dev_priv
, I915_USER_INTERRUPT
);
331 spin_unlock_irqrestore(&dev_priv
->user_irq_lock
, irqflags
);
334 void i915_user_irq_put(struct drm_device
*dev
)
336 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
337 unsigned long irqflags
;
339 spin_lock_irqsave(&dev_priv
->user_irq_lock
, irqflags
);
340 BUG_ON(dev
->irq_enabled
&& dev_priv
->user_irq_refcount
<= 0);
341 if (dev
->irq_enabled
&& (--dev_priv
->user_irq_refcount
== 0))
342 i915_disable_irq(dev_priv
, I915_USER_INTERRUPT
);
343 spin_unlock_irqrestore(&dev_priv
->user_irq_lock
, irqflags
);
346 static int i915_wait_irq(struct drm_device
* dev
, int irq_nr
)
348 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
349 struct drm_i915_master_private
*master_priv
= dev
->primary
->master
->driver_priv
;
352 DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr
,
353 READ_BREADCRUMB(dev_priv
));
355 if (READ_BREADCRUMB(dev_priv
) >= irq_nr
) {
356 if (master_priv
->sarea_priv
)
357 master_priv
->sarea_priv
->last_dispatch
= READ_BREADCRUMB(dev_priv
);
361 if (master_priv
->sarea_priv
)
362 master_priv
->sarea_priv
->perf_boxes
|= I915_BOX_WAIT
;
364 i915_user_irq_get(dev
);
365 DRM_WAIT_ON(ret
, dev_priv
->irq_queue
, 3 * DRM_HZ
,
366 READ_BREADCRUMB(dev_priv
) >= irq_nr
);
367 i915_user_irq_put(dev
);
370 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
371 READ_BREADCRUMB(dev_priv
), (int)dev_priv
->counter
);
377 /* Needs the lock as it touches the ring.
379 int i915_irq_emit(struct drm_device
*dev
, void *data
,
380 struct drm_file
*file_priv
)
382 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
383 drm_i915_irq_emit_t
*emit
= data
;
386 RING_LOCK_TEST_WITH_RETURN(dev
, file_priv
);
389 DRM_ERROR("called with no initialization\n");
392 mutex_lock(&dev
->struct_mutex
);
393 result
= i915_emit_irq(dev
);
394 mutex_unlock(&dev
->struct_mutex
);
396 if (DRM_COPY_TO_USER(emit
->irq_seq
, &result
, sizeof(int))) {
397 DRM_ERROR("copy_to_user\n");
404 /* Doesn't need the hardware lock.
406 int i915_irq_wait(struct drm_device
*dev
, void *data
,
407 struct drm_file
*file_priv
)
409 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
410 drm_i915_irq_wait_t
*irqwait
= data
;
413 DRM_ERROR("called with no initialization\n");
417 return i915_wait_irq(dev
, irqwait
->irq_seq
);
420 /* Called from drm generic code, passed 'crtc' which
421 * we use as a pipe index
423 int i915_enable_vblank(struct drm_device
*dev
, int pipe
)
425 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
426 unsigned long irqflags
;
427 int pipeconf_reg
= (pipe
== 0) ? PIPEACONF
: PIPEBCONF
;
430 pipeconf
= I915_READ(pipeconf_reg
);
431 if (!(pipeconf
& PIPEACONF_ENABLE
))
434 spin_lock_irqsave(&dev_priv
->user_irq_lock
, irqflags
);
436 i915_enable_pipestat(dev_priv
, pipe
,
437 PIPE_START_VBLANK_INTERRUPT_ENABLE
);
439 i915_enable_pipestat(dev_priv
, pipe
,
440 PIPE_VBLANK_INTERRUPT_ENABLE
);
441 spin_unlock_irqrestore(&dev_priv
->user_irq_lock
, irqflags
);
445 /* Called from drm generic code, passed 'crtc' which
446 * we use as a pipe index
448 void i915_disable_vblank(struct drm_device
*dev
, int pipe
)
450 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
451 unsigned long irqflags
;
453 spin_lock_irqsave(&dev_priv
->user_irq_lock
, irqflags
);
454 i915_disable_pipestat(dev_priv
, pipe
,
455 PIPE_VBLANK_INTERRUPT_ENABLE
|
456 PIPE_START_VBLANK_INTERRUPT_ENABLE
);
457 spin_unlock_irqrestore(&dev_priv
->user_irq_lock
, irqflags
);
460 void i915_enable_interrupt (struct drm_device
*dev
)
462 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
463 opregion_enable_asle(dev
);
464 dev_priv
->irq_enabled
= 1;
468 /* Set the vblank monitor pipe
470 int i915_vblank_pipe_set(struct drm_device
*dev
, void *data
,
471 struct drm_file
*file_priv
)
473 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
476 DRM_ERROR("called with no initialization\n");
483 int i915_vblank_pipe_get(struct drm_device
*dev
, void *data
,
484 struct drm_file
*file_priv
)
486 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
487 drm_i915_vblank_pipe_t
*pipe
= data
;
490 DRM_ERROR("called with no initialization\n");
494 pipe
->pipe
= DRM_I915_VBLANK_PIPE_A
| DRM_I915_VBLANK_PIPE_B
;
500 * Schedule buffer swap at given vertical blank.
502 int i915_vblank_swap(struct drm_device
*dev
, void *data
,
503 struct drm_file
*file_priv
)
505 /* The delayed swap mechanism was fundamentally racy, and has been
506 * removed. The model was that the client requested a delayed flip/swap
507 * from the kernel, then waited for vblank before continuing to perform
508 * rendering. The problem was that the kernel might wake the client
509 * up before it dispatched the vblank swap (since the lock has to be
510 * held while touching the ringbuffer), in which case the client would
511 * clear and start the next frame before the swap occurred, and
512 * flicker would occur in addition to likely missing the vblank.
514 * In the absence of this ioctl, userland falls back to a correct path
515 * of waiting for a vblank, then dispatching the swap on its own.
516 * Context switching to userland and back is plenty fast enough for
517 * meeting the requirements of vblank swapping.
524 void i915_driver_irq_preinstall(struct drm_device
* dev
)
526 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
528 atomic_set(&dev_priv
->irq_received
, 0);
530 I915_WRITE(HWSTAM
, 0xeffe);
531 I915_WRITE(PIPEASTAT
, 0);
532 I915_WRITE(PIPEBSTAT
, 0);
533 I915_WRITE(IMR
, 0xffffffff);
534 I915_WRITE(IER
, 0x0);
535 (void) I915_READ(IER
);
538 int i915_driver_irq_postinstall(struct drm_device
*dev
)
540 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
542 dev_priv
->vblank_pipe
= DRM_I915_VBLANK_PIPE_A
| DRM_I915_VBLANK_PIPE_B
;
544 dev
->max_vblank_count
= 0xffffff; /* only 24 bits of frame count */
546 /* Unmask the interrupts that we always want on. */
547 dev_priv
->irq_mask_reg
= ~I915_INTERRUPT_ENABLE_FIX
;
549 dev_priv
->pipestat
[0] = 0;
550 dev_priv
->pipestat
[1] = 0;
552 /* Disable pipe interrupt enables, clear pending pipe status */
553 I915_WRITE(PIPEASTAT
, I915_READ(PIPEASTAT
) & 0x8000ffff);
554 I915_WRITE(PIPEBSTAT
, I915_READ(PIPEBSTAT
) & 0x8000ffff);
555 /* Clear pending interrupt status */
556 I915_WRITE(IIR
, I915_READ(IIR
));
558 I915_WRITE(IER
, I915_INTERRUPT_ENABLE_MASK
);
559 I915_WRITE(IMR
, dev_priv
->irq_mask_reg
);
560 (void) I915_READ(IER
);
562 opregion_enable_asle(dev
);
563 DRM_INIT_WAITQUEUE(&dev_priv
->irq_queue
);
568 void i915_driver_irq_uninstall(struct drm_device
* dev
)
570 drm_i915_private_t
*dev_priv
= (drm_i915_private_t
*) dev
->dev_private
;
575 dev_priv
->vblank_pipe
= 0;
577 I915_WRITE(HWSTAM
, 0xffffffff);
578 I915_WRITE(PIPEASTAT
, 0);
579 I915_WRITE(PIPEBSTAT
, 0);
580 I915_WRITE(IMR
, 0xffffffff);
581 I915_WRITE(IER
, 0x0);
583 I915_WRITE(PIPEASTAT
, I915_READ(PIPEASTAT
) & 0x8000ffff);
584 I915_WRITE(PIPEBSTAT
, I915_READ(PIPEBSTAT
) & 0x8000ffff);
585 I915_WRITE(IIR
, I915_READ(IIR
));