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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - drivers/gpu/drm/drm_irq.c
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 static 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
->vbl_sigs
, sizeof(*dev
->vbl_sigs
) * dev
->num_crtcs
,
111 drm_free(dev
->_vblank_count
, sizeof(*dev
->_vblank_count
) *
112 dev
->num_crtcs
, DRM_MEM_DRIVER
);
113 drm_free(dev
->vblank_refcount
, sizeof(*dev
->vblank_refcount
) *
114 dev
->num_crtcs
, DRM_MEM_DRIVER
);
115 drm_free(dev
->vblank_enabled
, sizeof(*dev
->vblank_enabled
) *
116 dev
->num_crtcs
, DRM_MEM_DRIVER
);
117 drm_free(dev
->last_vblank
, sizeof(*dev
->last_vblank
) * dev
->num_crtcs
,
119 drm_free(dev
->vblank_inmodeset
, sizeof(*dev
->vblank_inmodeset
) *
120 dev
->num_crtcs
, DRM_MEM_DRIVER
);
125 int drm_vblank_init(struct drm_device
*dev
, int num_crtcs
)
127 int i
, ret
= -ENOMEM
;
129 setup_timer(&dev
->vblank_disable_timer
, vblank_disable_fn
,
131 spin_lock_init(&dev
->vbl_lock
);
132 atomic_set(&dev
->vbl_signal_pending
, 0);
133 dev
->num_crtcs
= num_crtcs
;
135 dev
->vbl_queue
= drm_alloc(sizeof(wait_queue_head_t
) * num_crtcs
,
140 dev
->vbl_sigs
= drm_alloc(sizeof(struct list_head
) * num_crtcs
,
145 dev
->_vblank_count
= drm_alloc(sizeof(atomic_t
) * num_crtcs
,
147 if (!dev
->_vblank_count
)
150 dev
->vblank_refcount
= drm_alloc(sizeof(atomic_t
) * num_crtcs
,
152 if (!dev
->vblank_refcount
)
155 dev
->vblank_enabled
= drm_calloc(num_crtcs
, sizeof(int),
157 if (!dev
->vblank_enabled
)
160 dev
->last_vblank
= drm_calloc(num_crtcs
, sizeof(u32
), DRM_MEM_DRIVER
);
161 if (!dev
->last_vblank
)
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 INIT_LIST_HEAD(&dev
->vbl_sigs
[i
]);
173 atomic_set(&dev
->_vblank_count
[i
], 0);
174 atomic_set(&dev
->vblank_refcount
[i
], 0);
177 dev
->vblank_disable_allowed
= 0;
182 drm_vblank_cleanup(dev
);
185 EXPORT_SYMBOL(drm_vblank_init
);
188 * Install IRQ handler.
190 * \param dev DRM device.
192 * Initializes the IRQ related data. Installs the handler, calling the driver
193 * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
194 * before and after the installation.
196 int drm_irq_install(struct drm_device
*dev
)
199 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
;
231 ret
= request_irq(drm_dev_to_irq(dev
), dev
->driver
->irq_handler
,
232 sh_flags
, dev
->devname
, dev
);
235 mutex_lock(&dev
->struct_mutex
);
236 dev
->irq_enabled
= 0;
237 mutex_unlock(&dev
->struct_mutex
);
241 /* After installing handler */
242 ret
= dev
->driver
->irq_postinstall(dev
);
244 mutex_lock(&dev
->struct_mutex
);
245 dev
->irq_enabled
= 0;
246 mutex_unlock(&dev
->struct_mutex
);
251 EXPORT_SYMBOL(drm_irq_install
);
254 * Uninstall the IRQ handler.
256 * \param dev DRM device.
258 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
260 int drm_irq_uninstall(struct drm_device
* dev
)
264 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
267 mutex_lock(&dev
->struct_mutex
);
268 irq_enabled
= dev
->irq_enabled
;
269 dev
->irq_enabled
= 0;
270 mutex_unlock(&dev
->struct_mutex
);
275 DRM_DEBUG("irq=%d\n", dev
->pdev
->irq
);
277 dev
->driver
->irq_uninstall(dev
);
279 free_irq(dev
->pdev
->irq
, dev
);
281 drm_vblank_cleanup(dev
);
285 EXPORT_SYMBOL(drm_irq_uninstall
);
290 * \param inode device inode.
291 * \param file_priv DRM file private.
292 * \param cmd command.
293 * \param arg user argument, pointing to a drm_control structure.
294 * \return zero on success or a negative number on failure.
296 * Calls irq_install() or irq_uninstall() according to \p arg.
298 int drm_control(struct drm_device
*dev
, void *data
,
299 struct drm_file
*file_priv
)
301 struct drm_control
*ctl
= data
;
303 /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
307 case DRM_INST_HANDLER
:
308 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
310 if (dev
->if_version
< DRM_IF_VERSION(1, 2) &&
311 ctl
->irq
!= dev
->pdev
->irq
)
313 return drm_irq_install(dev
);
314 case DRM_UNINST_HANDLER
:
315 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
317 return drm_irq_uninstall(dev
);
324 * drm_vblank_count - retrieve "cooked" vblank counter value
326 * @crtc: which counter to retrieve
328 * Fetches the "cooked" vblank count value that represents the number of
329 * vblank events since the system was booted, including lost events due to
330 * modesetting activity.
332 u32
drm_vblank_count(struct drm_device
*dev
, int crtc
)
334 return atomic_read(&dev
->_vblank_count
[crtc
]);
336 EXPORT_SYMBOL(drm_vblank_count
);
339 * drm_update_vblank_count - update the master vblank counter
341 * @crtc: counter to update
343 * Call back into the driver to update the appropriate vblank counter
344 * (specified by @crtc). Deal with wraparound, if it occurred, and
345 * update the last read value so we can deal with wraparound on the next
348 * Only necessary when going from off->on, to account for frames we
349 * didn't get an interrupt for.
351 * Note: caller must hold dev->vbl_lock since this reads & writes
352 * device vblank fields.
354 static void drm_update_vblank_count(struct drm_device
*dev
, int crtc
)
356 u32 cur_vblank
, diff
;
359 * Interrupts were disabled prior to this call, so deal with counter
361 * NOTE! It's possible we lost a full dev->max_vblank_count events
362 * here if the register is small or we had vblank interrupts off for
365 cur_vblank
= dev
->driver
->get_vblank_counter(dev
, crtc
);
366 diff
= cur_vblank
- dev
->last_vblank
[crtc
];
367 if (cur_vblank
< dev
->last_vblank
[crtc
]) {
368 diff
+= dev
->max_vblank_count
;
370 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
371 crtc
, dev
->last_vblank
[crtc
], cur_vblank
, diff
);
374 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
377 atomic_add(diff
, &dev
->_vblank_count
[crtc
]);
381 * drm_vblank_get - get a reference count on vblank events
383 * @crtc: which CRTC to own
385 * Acquire a reference count on vblank events to avoid having them disabled
389 * Zero on success, nonzero on failure.
391 int drm_vblank_get(struct drm_device
*dev
, int crtc
)
393 unsigned long irqflags
;
396 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
397 /* Going from 0->1 means we have to enable interrupts again */
398 if (atomic_add_return(1, &dev
->vblank_refcount
[crtc
]) == 1 &&
399 !dev
->vblank_enabled
[crtc
]) {
400 ret
= dev
->driver
->enable_vblank(dev
, crtc
);
401 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc
, ret
);
403 atomic_dec(&dev
->vblank_refcount
[crtc
]);
405 dev
->vblank_enabled
[crtc
] = 1;
406 drm_update_vblank_count(dev
, crtc
);
409 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
413 EXPORT_SYMBOL(drm_vblank_get
);
416 * drm_vblank_put - give up ownership of vblank events
418 * @crtc: which counter to give up
420 * Release ownership of a given vblank counter, turning off interrupts
423 void drm_vblank_put(struct drm_device
*dev
, int crtc
)
425 /* Last user schedules interrupt disable */
426 if (atomic_dec_and_test(&dev
->vblank_refcount
[crtc
]))
427 mod_timer(&dev
->vblank_disable_timer
, jiffies
+ 5*DRM_HZ
);
429 EXPORT_SYMBOL(drm_vblank_put
);
432 * drm_modeset_ctl - handle vblank event counter changes across mode switch
433 * @DRM_IOCTL_ARGS: standard ioctl arguments
435 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
436 * ioctls around modesetting so that any lost vblank events are accounted for.
438 * Generally the counter will reset across mode sets. If interrupts are
439 * enabled around this call, we don't have to do anything since the counter
440 * will have already been incremented.
442 int drm_modeset_ctl(struct drm_device
*dev
, void *data
,
443 struct drm_file
*file_priv
)
445 struct drm_modeset_ctl
*modeset
= data
;
446 unsigned long irqflags
;
449 /* If drm_vblank_init() hasn't been called yet, just no-op */
453 crtc
= modeset
->crtc
;
454 if (crtc
>= dev
->num_crtcs
) {
460 * To avoid all the problems that might happen if interrupts
461 * were enabled/disabled around or between these calls, we just
462 * have the kernel take a reference on the CRTC (just once though
463 * to avoid corrupting the count if multiple, mismatch calls occur),
464 * so that interrupts remain enabled in the interim.
466 switch (modeset
->cmd
) {
467 case _DRM_PRE_MODESET
:
468 if (!dev
->vblank_inmodeset
[crtc
]) {
469 dev
->vblank_inmodeset
[crtc
] = 1;
470 drm_vblank_get(dev
, crtc
);
473 case _DRM_POST_MODESET
:
474 if (dev
->vblank_inmodeset
[crtc
]) {
475 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
476 dev
->vblank_disable_allowed
= 1;
477 dev
->vblank_inmodeset
[crtc
] = 0;
478 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
479 drm_vblank_put(dev
, crtc
);
494 * \param inode device inode.
495 * \param file_priv DRM file private.
496 * \param cmd command.
497 * \param data user argument, pointing to a drm_wait_vblank structure.
498 * \return zero on success or a negative number on failure.
500 * Verifies the IRQ is installed.
502 * If a signal is requested checks if this task has already scheduled the same signal
503 * for the same vblank sequence number - nothing to be done in
504 * that case. If the number of tasks waiting for the interrupt exceeds 100 the
505 * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
508 * If a signal is not requested, then calls vblank_wait().
510 int drm_wait_vblank(struct drm_device
*dev
, void *data
,
511 struct drm_file
*file_priv
)
513 union drm_wait_vblank
*vblwait
= data
;
515 unsigned int flags
, seq
, crtc
;
517 if ((!dev
->pdev
->irq
) || (!dev
->irq_enabled
))
520 if (vblwait
->request
.type
&
521 ~(_DRM_VBLANK_TYPES_MASK
| _DRM_VBLANK_FLAGS_MASK
)) {
522 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
523 vblwait
->request
.type
,
524 (_DRM_VBLANK_TYPES_MASK
| _DRM_VBLANK_FLAGS_MASK
));
528 flags
= vblwait
->request
.type
& _DRM_VBLANK_FLAGS_MASK
;
529 crtc
= flags
& _DRM_VBLANK_SECONDARY
? 1 : 0;
531 if (crtc
>= dev
->num_crtcs
)
534 ret
= drm_vblank_get(dev
, crtc
);
536 DRM_ERROR("failed to acquire vblank counter, %d\n", ret
);
539 seq
= drm_vblank_count(dev
, crtc
);
541 switch (vblwait
->request
.type
& _DRM_VBLANK_TYPES_MASK
) {
542 case _DRM_VBLANK_RELATIVE
:
543 vblwait
->request
.sequence
+= seq
;
544 vblwait
->request
.type
&= ~_DRM_VBLANK_RELATIVE
;
545 case _DRM_VBLANK_ABSOLUTE
:
552 if ((flags
& _DRM_VBLANK_NEXTONMISS
) &&
553 (seq
- vblwait
->request
.sequence
) <= (1<<23)) {
554 vblwait
->request
.sequence
= seq
+ 1;
557 if (flags
& _DRM_VBLANK_SIGNAL
) {
558 unsigned long irqflags
;
559 struct list_head
*vbl_sigs
= &dev
->vbl_sigs
[crtc
];
560 struct drm_vbl_sig
*vbl_sig
;
562 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
564 /* Check if this task has already scheduled the same signal
565 * for the same vblank sequence number; nothing to be done in
568 list_for_each_entry(vbl_sig
, vbl_sigs
, head
) {
569 if (vbl_sig
->sequence
== vblwait
->request
.sequence
570 && vbl_sig
->info
.si_signo
==
571 vblwait
->request
.signal
572 && vbl_sig
->task
== current
) {
573 spin_unlock_irqrestore(&dev
->vbl_lock
,
575 vblwait
->reply
.sequence
= seq
;
580 if (atomic_read(&dev
->vbl_signal_pending
) >= 100) {
581 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
586 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
588 vbl_sig
= drm_calloc(1, sizeof(struct drm_vbl_sig
),
595 /* Get a refcount on the vblank, which will be released by
596 * drm_vbl_send_signals().
598 ret
= drm_vblank_get(dev
, crtc
);
600 drm_free(vbl_sig
, sizeof(struct drm_vbl_sig
),
605 atomic_inc(&dev
->vbl_signal_pending
);
607 vbl_sig
->sequence
= vblwait
->request
.sequence
;
608 vbl_sig
->info
.si_signo
= vblwait
->request
.signal
;
609 vbl_sig
->task
= current
;
611 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
613 list_add_tail(&vbl_sig
->head
, vbl_sigs
);
615 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
617 vblwait
->reply
.sequence
= seq
;
619 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
620 vblwait
->request
.sequence
, crtc
);
621 DRM_WAIT_ON(ret
, dev
->vbl_queue
[crtc
], 3 * DRM_HZ
,
622 ((drm_vblank_count(dev
, crtc
)
623 - vblwait
->request
.sequence
) <= (1 << 23)));
628 do_gettimeofday(&now
);
630 vblwait
->reply
.tval_sec
= now
.tv_sec
;
631 vblwait
->reply
.tval_usec
= now
.tv_usec
;
632 vblwait
->reply
.sequence
= drm_vblank_count(dev
, crtc
);
633 DRM_DEBUG("returning %d to client\n",
634 vblwait
->reply
.sequence
);
636 DRM_DEBUG("vblank wait interrupted by signal\n");
641 drm_vblank_put(dev
, crtc
);
646 * Send the VBLANK signals.
648 * \param dev DRM device.
649 * \param crtc CRTC where the vblank event occurred
651 * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
653 * If a signal is not requested, then calls vblank_wait().
655 static void drm_vbl_send_signals(struct drm_device
*dev
, int crtc
)
657 struct drm_vbl_sig
*vbl_sig
, *tmp
;
658 struct list_head
*vbl_sigs
;
659 unsigned int vbl_seq
;
662 spin_lock_irqsave(&dev
->vbl_lock
, flags
);
664 vbl_sigs
= &dev
->vbl_sigs
[crtc
];
665 vbl_seq
= drm_vblank_count(dev
, crtc
);
667 list_for_each_entry_safe(vbl_sig
, tmp
, vbl_sigs
, head
) {
668 if ((vbl_seq
- vbl_sig
->sequence
) <= (1 << 23)) {
669 vbl_sig
->info
.si_code
= vbl_seq
;
670 send_sig_info(vbl_sig
->info
.si_signo
,
671 &vbl_sig
->info
, vbl_sig
->task
);
673 list_del(&vbl_sig
->head
);
675 drm_free(vbl_sig
, sizeof(*vbl_sig
),
677 atomic_dec(&dev
->vbl_signal_pending
);
678 drm_vblank_put(dev
, crtc
);
682 spin_unlock_irqrestore(&dev
->vbl_lock
, flags
);
686 * drm_handle_vblank - handle a vblank event
688 * @crtc: where this event occurred
690 * Drivers should call this routine in their vblank interrupt handlers to
691 * update the vblank counter and send any signals that may be pending.
693 void drm_handle_vblank(struct drm_device
*dev
, int crtc
)
695 atomic_inc(&dev
->_vblank_count
[crtc
]);
696 DRM_WAKEUP(&dev
->vbl_queue
[crtc
]);
697 drm_vbl_send_signals(dev
, crtc
);
699 EXPORT_SYMBOL(drm_handle_vblank
);