5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
10 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
38 #include <linux/interrupt.h> /* For task queue support */
41 * Get interrupt from bus id.
43 * \param inode device inode.
44 * \param file_priv DRM file private.
46 * \param arg user argument, pointing to a drm_irq_busid structure.
47 * \return zero on success or a negative number on failure.
49 * Finds the PCI device with the specified bus id and gets its IRQ number.
50 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
51 * to that of the device that this DRM instance attached to.
53 int drm_irq_by_busid(struct drm_device
*dev
, void *data
,
54 struct drm_file
*file_priv
)
56 struct drm_irq_busid
*p
= data
;
58 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
61 if ((p
->busnum
>> 8) != drm_get_pci_domain(dev
) ||
62 (p
->busnum
& 0xff) != dev
->pdev
->bus
->number
||
63 p
->devnum
!= PCI_SLOT(dev
->pdev
->devfn
) || p
->funcnum
!= PCI_FUNC(dev
->pdev
->devfn
))
66 p
->irq
= dev
->pdev
->irq
;
68 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p
->busnum
, p
->devnum
, p
->funcnum
,
74 static void vblank_disable_fn(unsigned long arg
)
76 struct drm_device
*dev
= (struct drm_device
*)arg
;
77 unsigned long irqflags
;
80 if (!dev
->vblank_disable_allowed
)
83 for (i
= 0; i
< dev
->num_crtcs
; i
++) {
84 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
85 if (atomic_read(&dev
->vblank_refcount
[i
]) == 0 &&
86 dev
->vblank_enabled
[i
]) {
87 DRM_DEBUG("disabling vblank on crtc %d\n", i
);
89 dev
->driver
->get_vblank_counter(dev
, i
);
90 dev
->driver
->disable_vblank(dev
, i
);
91 dev
->vblank_enabled
[i
] = 0;
93 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
97 void drm_vblank_cleanup(struct drm_device
*dev
)
99 /* Bail if the driver didn't call drm_vblank_init() */
100 if (dev
->num_crtcs
== 0)
103 del_timer(&dev
->vblank_disable_timer
);
105 vblank_disable_fn((unsigned long)dev
);
107 drm_free(dev
->vbl_queue
, sizeof(*dev
->vbl_queue
) * dev
->num_crtcs
,
109 drm_free(dev
->_vblank_count
, sizeof(*dev
->_vblank_count
) *
110 dev
->num_crtcs
, DRM_MEM_DRIVER
);
111 drm_free(dev
->vblank_refcount
, sizeof(*dev
->vblank_refcount
) *
112 dev
->num_crtcs
, DRM_MEM_DRIVER
);
113 drm_free(dev
->vblank_enabled
, sizeof(*dev
->vblank_enabled
) *
114 dev
->num_crtcs
, DRM_MEM_DRIVER
);
115 drm_free(dev
->last_vblank
, sizeof(*dev
->last_vblank
) * dev
->num_crtcs
,
117 drm_free(dev
->last_vblank_wait
,
118 sizeof(*dev
->last_vblank_wait
) * dev
->num_crtcs
,
120 drm_free(dev
->vblank_inmodeset
, sizeof(*dev
->vblank_inmodeset
) *
121 dev
->num_crtcs
, DRM_MEM_DRIVER
);
126 int drm_vblank_init(struct drm_device
*dev
, int num_crtcs
)
128 int i
, ret
= -ENOMEM
;
130 setup_timer(&dev
->vblank_disable_timer
, vblank_disable_fn
,
132 spin_lock_init(&dev
->vbl_lock
);
133 dev
->num_crtcs
= num_crtcs
;
135 dev
->vbl_queue
= drm_alloc(sizeof(wait_queue_head_t
) * num_crtcs
,
140 dev
->_vblank_count
= drm_alloc(sizeof(atomic_t
) * num_crtcs
,
142 if (!dev
->_vblank_count
)
145 dev
->vblank_refcount
= drm_alloc(sizeof(atomic_t
) * num_crtcs
,
147 if (!dev
->vblank_refcount
)
150 dev
->vblank_enabled
= drm_calloc(num_crtcs
, sizeof(int),
152 if (!dev
->vblank_enabled
)
155 dev
->last_vblank
= drm_calloc(num_crtcs
, sizeof(u32
), DRM_MEM_DRIVER
);
156 if (!dev
->last_vblank
)
159 dev
->last_vblank_wait
= drm_calloc(num_crtcs
, sizeof(u32
),
161 if (!dev
->last_vblank_wait
)
164 dev
->vblank_inmodeset
= drm_calloc(num_crtcs
, sizeof(int),
166 if (!dev
->vblank_inmodeset
)
169 /* Zero per-crtc vblank stuff */
170 for (i
= 0; i
< num_crtcs
; i
++) {
171 init_waitqueue_head(&dev
->vbl_queue
[i
]);
172 atomic_set(&dev
->_vblank_count
[i
], 0);
173 atomic_set(&dev
->vblank_refcount
[i
], 0);
176 dev
->vblank_disable_allowed
= 0;
181 drm_vblank_cleanup(dev
);
184 EXPORT_SYMBOL(drm_vblank_init
);
187 * Install IRQ handler.
189 * \param dev DRM device.
191 * Initializes the IRQ related data. Installs the handler, calling the driver
192 * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
193 * before and after the installation.
195 int drm_irq_install(struct drm_device
*dev
)
198 unsigned long sh_flags
= 0;
201 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
204 if (dev
->pdev
->irq
== 0)
207 mutex_lock(&dev
->struct_mutex
);
209 /* Driver must have been initialized */
210 if (!dev
->dev_private
) {
211 mutex_unlock(&dev
->struct_mutex
);
215 if (dev
->irq_enabled
) {
216 mutex_unlock(&dev
->struct_mutex
);
219 dev
->irq_enabled
= 1;
220 mutex_unlock(&dev
->struct_mutex
);
222 DRM_DEBUG("irq=%d\n", dev
->pdev
->irq
);
224 /* Before installing handler */
225 dev
->driver
->irq_preinstall(dev
);
227 /* Install handler */
228 if (drm_core_check_feature(dev
, DRIVER_IRQ_SHARED
))
229 sh_flags
= IRQF_SHARED
;
232 irqname
= dev
->devname
;
234 irqname
= dev
->driver
->name
;
236 ret
= request_irq(drm_dev_to_irq(dev
), dev
->driver
->irq_handler
,
237 sh_flags
, irqname
, dev
);
240 mutex_lock(&dev
->struct_mutex
);
241 dev
->irq_enabled
= 0;
242 mutex_unlock(&dev
->struct_mutex
);
246 /* After installing handler */
247 ret
= dev
->driver
->irq_postinstall(dev
);
249 mutex_lock(&dev
->struct_mutex
);
250 dev
->irq_enabled
= 0;
251 mutex_unlock(&dev
->struct_mutex
);
256 EXPORT_SYMBOL(drm_irq_install
);
259 * Uninstall the IRQ handler.
261 * \param dev DRM device.
263 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
265 int drm_irq_uninstall(struct drm_device
* dev
)
267 unsigned long irqflags
;
270 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
273 mutex_lock(&dev
->struct_mutex
);
274 irq_enabled
= dev
->irq_enabled
;
275 dev
->irq_enabled
= 0;
276 mutex_unlock(&dev
->struct_mutex
);
279 * Wake up any waiters so they don't hang.
281 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
282 for (i
= 0; i
< dev
->num_crtcs
; i
++) {
283 DRM_WAKEUP(&dev
->vbl_queue
[i
]);
284 dev
->vblank_enabled
[i
] = 0;
285 dev
->last_vblank
[i
] = dev
->driver
->get_vblank_counter(dev
, i
);
287 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
292 DRM_DEBUG("irq=%d\n", dev
->pdev
->irq
);
294 dev
->driver
->irq_uninstall(dev
);
296 free_irq(dev
->pdev
->irq
, dev
);
300 EXPORT_SYMBOL(drm_irq_uninstall
);
305 * \param inode device inode.
306 * \param file_priv DRM file private.
307 * \param cmd command.
308 * \param arg user argument, pointing to a drm_control structure.
309 * \return zero on success or a negative number on failure.
311 * Calls irq_install() or irq_uninstall() according to \p arg.
313 int drm_control(struct drm_device
*dev
, void *data
,
314 struct drm_file
*file_priv
)
316 struct drm_control
*ctl
= data
;
318 /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
322 case DRM_INST_HANDLER
:
323 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
325 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
327 if (dev
->if_version
< DRM_IF_VERSION(1, 2) &&
328 ctl
->irq
!= dev
->pdev
->irq
)
330 return drm_irq_install(dev
);
331 case DRM_UNINST_HANDLER
:
332 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
334 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
336 return drm_irq_uninstall(dev
);
343 * drm_vblank_count - retrieve "cooked" vblank counter value
345 * @crtc: which counter to retrieve
347 * Fetches the "cooked" vblank count value that represents the number of
348 * vblank events since the system was booted, including lost events due to
349 * modesetting activity.
351 u32
drm_vblank_count(struct drm_device
*dev
, int crtc
)
353 return atomic_read(&dev
->_vblank_count
[crtc
]);
355 EXPORT_SYMBOL(drm_vblank_count
);
358 * drm_update_vblank_count - update the master vblank counter
360 * @crtc: counter to update
362 * Call back into the driver to update the appropriate vblank counter
363 * (specified by @crtc). Deal with wraparound, if it occurred, and
364 * update the last read value so we can deal with wraparound on the next
367 * Only necessary when going from off->on, to account for frames we
368 * didn't get an interrupt for.
370 * Note: caller must hold dev->vbl_lock since this reads & writes
371 * device vblank fields.
373 static void drm_update_vblank_count(struct drm_device
*dev
, int crtc
)
375 u32 cur_vblank
, diff
;
378 * Interrupts were disabled prior to this call, so deal with counter
380 * NOTE! It's possible we lost a full dev->max_vblank_count events
381 * here if the register is small or we had vblank interrupts off for
384 cur_vblank
= dev
->driver
->get_vblank_counter(dev
, crtc
);
385 diff
= cur_vblank
- dev
->last_vblank
[crtc
];
386 if (cur_vblank
< dev
->last_vblank
[crtc
]) {
387 diff
+= dev
->max_vblank_count
;
389 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
390 crtc
, dev
->last_vblank
[crtc
], cur_vblank
, diff
);
393 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
396 atomic_add(diff
, &dev
->_vblank_count
[crtc
]);
400 * drm_vblank_get - get a reference count on vblank events
402 * @crtc: which CRTC to own
404 * Acquire a reference count on vblank events to avoid having them disabled
408 * Zero on success, nonzero on failure.
410 int drm_vblank_get(struct drm_device
*dev
, int crtc
)
412 unsigned long irqflags
;
415 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
416 /* Going from 0->1 means we have to enable interrupts again */
417 if (atomic_add_return(1, &dev
->vblank_refcount
[crtc
]) == 1 &&
418 !dev
->vblank_enabled
[crtc
]) {
419 ret
= dev
->driver
->enable_vblank(dev
, crtc
);
420 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc
, ret
);
422 atomic_dec(&dev
->vblank_refcount
[crtc
]);
424 dev
->vblank_enabled
[crtc
] = 1;
425 drm_update_vblank_count(dev
, crtc
);
428 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
432 EXPORT_SYMBOL(drm_vblank_get
);
435 * drm_vblank_put - give up ownership of vblank events
437 * @crtc: which counter to give up
439 * Release ownership of a given vblank counter, turning off interrupts
442 void drm_vblank_put(struct drm_device
*dev
, int crtc
)
444 BUG_ON (atomic_read (&dev
->vblank_refcount
[crtc
]) == 0);
446 /* Last user schedules interrupt disable */
447 if (atomic_dec_and_test(&dev
->vblank_refcount
[crtc
]))
448 mod_timer(&dev
->vblank_disable_timer
, jiffies
+ 5*DRM_HZ
);
450 EXPORT_SYMBOL(drm_vblank_put
);
453 * drm_vblank_pre_modeset - account for vblanks across mode sets
455 * @crtc: CRTC in question
456 * @post: post or pre mode set?
458 * Account for vblank events across mode setting events, which will likely
459 * reset the hardware frame counter.
461 void drm_vblank_pre_modeset(struct drm_device
*dev
, int crtc
)
464 * To avoid all the problems that might happen if interrupts
465 * were enabled/disabled around or between these calls, we just
466 * have the kernel take a reference on the CRTC (just once though
467 * to avoid corrupting the count if multiple, mismatch calls occur),
468 * so that interrupts remain enabled in the interim.
470 if (!dev
->vblank_inmodeset
[crtc
]) {
471 dev
->vblank_inmodeset
[crtc
] = 0x1;
472 if (drm_vblank_get(dev
, crtc
) == 0)
473 dev
->vblank_inmodeset
[crtc
] |= 0x2;
476 EXPORT_SYMBOL(drm_vblank_pre_modeset
);
478 void drm_vblank_post_modeset(struct drm_device
*dev
, int crtc
)
480 unsigned long irqflags
;
482 if (dev
->vblank_inmodeset
[crtc
]) {
483 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
484 dev
->vblank_disable_allowed
= 1;
485 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
487 if (dev
->vblank_inmodeset
[crtc
] & 0x2)
488 drm_vblank_put(dev
, crtc
);
490 dev
->vblank_inmodeset
[crtc
] = 0;
493 EXPORT_SYMBOL(drm_vblank_post_modeset
);
496 * drm_modeset_ctl - handle vblank event counter changes across mode switch
497 * @DRM_IOCTL_ARGS: standard ioctl arguments
499 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
500 * ioctls around modesetting so that any lost vblank events are accounted for.
502 * Generally the counter will reset across mode sets. If interrupts are
503 * enabled around this call, we don't have to do anything since the counter
504 * will have already been incremented.
506 int drm_modeset_ctl(struct drm_device
*dev
, void *data
,
507 struct drm_file
*file_priv
)
509 struct drm_modeset_ctl
*modeset
= data
;
512 /* If drm_vblank_init() hasn't been called yet, just no-op */
516 crtc
= modeset
->crtc
;
517 if (crtc
>= dev
->num_crtcs
) {
522 switch (modeset
->cmd
) {
523 case _DRM_PRE_MODESET
:
524 drm_vblank_pre_modeset(dev
, crtc
);
526 case _DRM_POST_MODESET
:
527 drm_vblank_post_modeset(dev
, crtc
);
541 * \param inode device inode.
542 * \param file_priv DRM file private.
543 * \param cmd command.
544 * \param data user argument, pointing to a drm_wait_vblank structure.
545 * \return zero on success or a negative number on failure.
547 * This function enables the vblank interrupt on the pipe requested, then
548 * sleeps waiting for the requested sequence number to occur, and drops
549 * the vblank interrupt refcount afterwards. (vblank irq disable follows that
550 * after a timeout with no further vblank waits scheduled).
552 int drm_wait_vblank(struct drm_device
*dev
, void *data
,
553 struct drm_file
*file_priv
)
555 union drm_wait_vblank
*vblwait
= data
;
557 unsigned int flags
, seq
, crtc
;
559 if ((!dev
->pdev
->irq
) || (!dev
->irq_enabled
))
562 if (vblwait
->request
.type
& _DRM_VBLANK_SIGNAL
)
565 if (vblwait
->request
.type
&
566 ~(_DRM_VBLANK_TYPES_MASK
| _DRM_VBLANK_FLAGS_MASK
)) {
567 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
568 vblwait
->request
.type
,
569 (_DRM_VBLANK_TYPES_MASK
| _DRM_VBLANK_FLAGS_MASK
));
573 flags
= vblwait
->request
.type
& _DRM_VBLANK_FLAGS_MASK
;
574 crtc
= flags
& _DRM_VBLANK_SECONDARY
? 1 : 0;
576 if (crtc
>= dev
->num_crtcs
)
579 ret
= drm_vblank_get(dev
, crtc
);
581 DRM_ERROR("failed to acquire vblank counter, %d\n", ret
);
584 seq
= drm_vblank_count(dev
, crtc
);
586 switch (vblwait
->request
.type
& _DRM_VBLANK_TYPES_MASK
) {
587 case _DRM_VBLANK_RELATIVE
:
588 vblwait
->request
.sequence
+= seq
;
589 vblwait
->request
.type
&= ~_DRM_VBLANK_RELATIVE
;
590 case _DRM_VBLANK_ABSOLUTE
:
597 if ((flags
& _DRM_VBLANK_NEXTONMISS
) &&
598 (seq
- vblwait
->request
.sequence
) <= (1<<23)) {
599 vblwait
->request
.sequence
= seq
+ 1;
602 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
603 vblwait
->request
.sequence
, crtc
);
604 dev
->last_vblank_wait
[crtc
] = vblwait
->request
.sequence
;
605 DRM_WAIT_ON(ret
, dev
->vbl_queue
[crtc
], 3 * DRM_HZ
,
606 (((drm_vblank_count(dev
, crtc
) -
607 vblwait
->request
.sequence
) <= (1 << 23)) ||
613 do_gettimeofday(&now
);
615 vblwait
->reply
.tval_sec
= now
.tv_sec
;
616 vblwait
->reply
.tval_usec
= now
.tv_usec
;
617 vblwait
->reply
.sequence
= drm_vblank_count(dev
, crtc
);
618 DRM_DEBUG("returning %d to client\n",
619 vblwait
->reply
.sequence
);
621 DRM_DEBUG("vblank wait interrupted by signal\n");
625 drm_vblank_put(dev
, crtc
);
630 * drm_handle_vblank - handle a vblank event
632 * @crtc: where this event occurred
634 * Drivers should call this routine in their vblank interrupt handlers to
635 * update the vblank counter and send any signals that may be pending.
637 void drm_handle_vblank(struct drm_device
*dev
, int crtc
)
639 atomic_inc(&dev
->_vblank_count
[crtc
]);
640 DRM_WAKEUP(&dev
->vbl_queue
[crtc
]);
642 EXPORT_SYMBOL(drm_handle_vblank
);
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