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->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);
283 EXPORT_SYMBOL(drm_irq_uninstall);
288 * \param inode device inode.
289 * \param file_priv DRM file private.
290 * \param cmd command.
291 * \param arg user argument, pointing to a drm_control structure.
292 * \return zero on success or a negative number on failure.
294 * Calls irq_install() or irq_uninstall() according to \p arg.
296 int drm_control(struct drm_device *dev, void *data,
297 struct drm_file *file_priv)
299 struct drm_control *ctl = data;
301 /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
305 case DRM_INST_HANDLER:
306 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
308 if (drm_core_check_feature(dev, DRIVER_MODESET))
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 if (drm_core_check_feature(dev, DRIVER_MODESET))
319 return drm_irq_uninstall(dev);
326 * drm_vblank_count - retrieve "cooked" vblank counter value
328 * @crtc: which counter to retrieve
330 * Fetches the "cooked" vblank count value that represents the number of
331 * vblank events since the system was booted, including lost events due to
332 * modesetting activity.
334 u32 drm_vblank_count(struct drm_device *dev, int crtc)
336 return atomic_read(&dev->_vblank_count[crtc]);
338 EXPORT_SYMBOL(drm_vblank_count);
341 * drm_update_vblank_count - update the master vblank counter
343 * @crtc: counter to update
345 * Call back into the driver to update the appropriate vblank counter
346 * (specified by @crtc). Deal with wraparound, if it occurred, and
347 * update the last read value so we can deal with wraparound on the next
350 * Only necessary when going from off->on, to account for frames we
351 * didn't get an interrupt for.
353 * Note: caller must hold dev->vbl_lock since this reads & writes
354 * device vblank fields.
356 static void drm_update_vblank_count(struct drm_device *dev, int crtc)
358 u32 cur_vblank, diff;
361 * Interrupts were disabled prior to this call, so deal with counter
363 * NOTE! It's possible we lost a full dev->max_vblank_count events
364 * here if the register is small or we had vblank interrupts off for
367 cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
368 diff = cur_vblank - dev->last_vblank[crtc];
369 if (cur_vblank < dev->last_vblank[crtc]) {
370 diff += dev->max_vblank_count;
372 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
373 crtc, dev->last_vblank[crtc], cur_vblank, diff);
376 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
379 atomic_add(diff, &dev->_vblank_count[crtc]);
383 * drm_vblank_get - get a reference count on vblank events
385 * @crtc: which CRTC to own
387 * Acquire a reference count on vblank events to avoid having them disabled
391 * Zero on success, nonzero on failure.
393 int drm_vblank_get(struct drm_device *dev, int crtc)
395 unsigned long irqflags;
398 spin_lock_irqsave(&dev->vbl_lock, irqflags);
399 /* Going from 0->1 means we have to enable interrupts again */
400 if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1 &&
401 !dev->vblank_enabled[crtc]) {
402 ret = dev->driver->enable_vblank(dev, crtc);
403 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret);
405 atomic_dec(&dev->vblank_refcount[crtc]);
407 dev->vblank_enabled[crtc] = 1;
408 drm_update_vblank_count(dev, crtc);
411 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
415 EXPORT_SYMBOL(drm_vblank_get);
418 * drm_vblank_put - give up ownership of vblank events
420 * @crtc: which counter to give up
422 * Release ownership of a given vblank counter, turning off interrupts
425 void drm_vblank_put(struct drm_device *dev, int crtc)
427 /* Last user schedules interrupt disable */
428 if (atomic_dec_and_test(&dev->vblank_refcount[crtc]))
429 mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ);
431 EXPORT_SYMBOL(drm_vblank_put);
434 * drm_vblank_pre_modeset - account for vblanks across mode sets
436 * @crtc: CRTC in question
437 * @post: post or pre mode set?
439 * Account for vblank events across mode setting events, which will likely
440 * reset the hardware frame counter.
442 void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
445 * To avoid all the problems that might happen if interrupts
446 * were enabled/disabled around or between these calls, we just
447 * have the kernel take a reference on the CRTC (just once though
448 * to avoid corrupting the count if multiple, mismatch calls occur),
449 * so that interrupts remain enabled in the interim.
451 if (!dev->vblank_inmodeset[crtc]) {
452 dev->vblank_inmodeset[crtc] = 1;
453 drm_vblank_get(dev, crtc);
456 EXPORT_SYMBOL(drm_vblank_pre_modeset);
458 void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
460 unsigned long irqflags;
462 if (dev->vblank_inmodeset[crtc]) {
463 spin_lock_irqsave(&dev->vbl_lock, irqflags);
464 dev->vblank_disable_allowed = 1;
465 dev->vblank_inmodeset[crtc] = 0;
466 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
467 drm_vblank_put(dev, crtc);
470 EXPORT_SYMBOL(drm_vblank_post_modeset);
473 * drm_modeset_ctl - handle vblank event counter changes across mode switch
474 * @DRM_IOCTL_ARGS: standard ioctl arguments
476 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
477 * ioctls around modesetting so that any lost vblank events are accounted for.
479 * Generally the counter will reset across mode sets. If interrupts are
480 * enabled around this call, we don't have to do anything since the counter
481 * will have already been incremented.
483 int drm_modeset_ctl(struct drm_device *dev, void *data,
484 struct drm_file *file_priv)
486 struct drm_modeset_ctl *modeset = data;
489 /* If drm_vblank_init() hasn't been called yet, just no-op */
493 crtc = modeset->crtc;
494 if (crtc >= dev->num_crtcs) {
499 switch (modeset->cmd) {
500 case _DRM_PRE_MODESET:
501 drm_vblank_pre_modeset(dev, crtc);
503 case _DRM_POST_MODESET:
504 drm_vblank_post_modeset(dev, crtc);
518 * \param inode device inode.
519 * \param file_priv DRM file private.
520 * \param cmd command.
521 * \param data user argument, pointing to a drm_wait_vblank structure.
522 * \return zero on success or a negative number on failure.
524 * Verifies the IRQ is installed.
526 * If a signal is requested checks if this task has already scheduled the same signal
527 * for the same vblank sequence number - nothing to be done in
528 * that case. If the number of tasks waiting for the interrupt exceeds 100 the
529 * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
532 * If a signal is not requested, then calls vblank_wait().
534 int drm_wait_vblank(struct drm_device *dev, void *data,
535 struct drm_file *file_priv)
537 union drm_wait_vblank *vblwait = data;
539 unsigned int flags, seq, crtc;
541 if ((!dev->pdev->irq) || (!dev->irq_enabled))
544 if (vblwait->request.type &
545 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
546 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
547 vblwait->request.type,
548 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
552 flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
553 crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
555 if (crtc >= dev->num_crtcs)
558 ret = drm_vblank_get(dev, crtc);
560 DRM_ERROR("failed to acquire vblank counter, %d\n", ret);
563 seq = drm_vblank_count(dev, crtc);
565 switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
566 case _DRM_VBLANK_RELATIVE:
567 vblwait->request.sequence += seq;
568 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
569 case _DRM_VBLANK_ABSOLUTE:
576 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
577 (seq - vblwait->request.sequence) <= (1<<23)) {
578 vblwait->request.sequence = seq + 1;
581 if (flags & _DRM_VBLANK_SIGNAL) {
582 unsigned long irqflags;
583 struct list_head *vbl_sigs = &dev->vbl_sigs[crtc];
584 struct drm_vbl_sig *vbl_sig;
586 spin_lock_irqsave(&dev->vbl_lock, irqflags);
588 /* Check if this task has already scheduled the same signal
589 * for the same vblank sequence number; nothing to be done in
592 list_for_each_entry(vbl_sig, vbl_sigs, head) {
593 if (vbl_sig->sequence == vblwait->request.sequence
594 && vbl_sig->info.si_signo ==
595 vblwait->request.signal
596 && vbl_sig->task == current) {
597 spin_unlock_irqrestore(&dev->vbl_lock,
599 vblwait->reply.sequence = seq;
604 if (atomic_read(&dev->vbl_signal_pending) >= 100) {
605 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
610 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
612 vbl_sig = drm_calloc(1, sizeof(struct drm_vbl_sig),
619 /* Get a refcount on the vblank, which will be released by
620 * drm_vbl_send_signals().
622 ret = drm_vblank_get(dev, crtc);
624 drm_free(vbl_sig, sizeof(struct drm_vbl_sig),
629 atomic_inc(&dev->vbl_signal_pending);
631 vbl_sig->sequence = vblwait->request.sequence;
632 vbl_sig->info.si_signo = vblwait->request.signal;
633 vbl_sig->task = current;
635 spin_lock_irqsave(&dev->vbl_lock, irqflags);
637 list_add_tail(&vbl_sig->head, vbl_sigs);
639 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
641 vblwait->reply.sequence = seq;
643 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
644 vblwait->request.sequence, crtc);
645 DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
646 ((drm_vblank_count(dev, crtc)
647 - vblwait->request.sequence) <= (1 << 23)));
652 do_gettimeofday(&now);
654 vblwait->reply.tval_sec = now.tv_sec;
655 vblwait->reply.tval_usec = now.tv_usec;
656 vblwait->reply.sequence = drm_vblank_count(dev, crtc);
657 DRM_DEBUG("returning %d to client\n",
658 vblwait->reply.sequence);
660 DRM_DEBUG("vblank wait interrupted by signal\n");
665 drm_vblank_put(dev, crtc);
670 * Send the VBLANK signals.
672 * \param dev DRM device.
673 * \param crtc CRTC where the vblank event occurred
675 * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
677 * If a signal is not requested, then calls vblank_wait().
679 static void drm_vbl_send_signals(struct drm_device *dev, int crtc)
681 struct drm_vbl_sig *vbl_sig, *tmp;
682 struct list_head *vbl_sigs;
683 unsigned int vbl_seq;
686 spin_lock_irqsave(&dev->vbl_lock, flags);
688 vbl_sigs = &dev->vbl_sigs[crtc];
689 vbl_seq = drm_vblank_count(dev, crtc);
691 list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) {
692 if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) {
693 vbl_sig->info.si_code = vbl_seq;
694 send_sig_info(vbl_sig->info.si_signo,
695 &vbl_sig->info, vbl_sig->task);
697 list_del(&vbl_sig->head);
699 drm_free(vbl_sig, sizeof(*vbl_sig),
701 atomic_dec(&dev->vbl_signal_pending);
702 drm_vblank_put(dev, crtc);
706 spin_unlock_irqrestore(&dev->vbl_lock, flags);
710 * drm_handle_vblank - handle a vblank event
712 * @crtc: where this event occurred
714 * Drivers should call this routine in their vblank interrupt handlers to
715 * update the vblank counter and send any signals that may be pending.
717 void drm_handle_vblank(struct drm_device *dev, int crtc)
719 atomic_inc(&dev->_vblank_count[crtc]);
720 DRM_WAKEUP(&dev->vbl_queue[crtc]);
721 drm_vbl_send_signals(dev, crtc);
723 EXPORT_SYMBOL(drm_handle_vblank);