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))
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))
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->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(dev->irq, dev->driver->irq_handler,
232 sh_flags, dev->devname, dev);
234 mutex_lock(&dev->struct_mutex);
235 dev->irq_enabled = 0;
236 mutex_unlock(&dev->struct_mutex);
240 /* After installing handler */
241 ret = dev->driver->irq_postinstall(dev);
243 mutex_lock(&dev->struct_mutex);
244 dev->irq_enabled = 0;
245 mutex_unlock(&dev->struct_mutex);
250 EXPORT_SYMBOL(drm_irq_install);
253 * Uninstall the IRQ handler.
255 * \param dev DRM device.
257 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
259 int drm_irq_uninstall(struct drm_device * dev)
263 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
266 mutex_lock(&dev->struct_mutex);
267 irq_enabled = dev->irq_enabled;
268 dev->irq_enabled = 0;
269 mutex_unlock(&dev->struct_mutex);
274 DRM_DEBUG("irq=%d\n", dev->irq);
276 dev->driver->irq_uninstall(dev);
278 free_irq(dev->irq, dev);
280 drm_vblank_cleanup(dev);
282 dev->locked_tasklet_func = NULL;
286 EXPORT_SYMBOL(drm_irq_uninstall);
291 * \param inode device inode.
292 * \param file_priv DRM file private.
293 * \param cmd command.
294 * \param arg user argument, pointing to a drm_control structure.
295 * \return zero on success or a negative number on failure.
297 * Calls irq_install() or irq_uninstall() according to \p arg.
299 int drm_control(struct drm_device *dev, void *data,
300 struct drm_file *file_priv)
302 struct drm_control *ctl = data;
304 /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
308 case DRM_INST_HANDLER:
309 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
311 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
312 ctl->irq != dev->irq)
314 return drm_irq_install(dev);
315 case DRM_UNINST_HANDLER:
316 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
318 return drm_irq_uninstall(dev);
325 * drm_vblank_count - retrieve "cooked" vblank counter value
327 * @crtc: which counter to retrieve
329 * Fetches the "cooked" vblank count value that represents the number of
330 * vblank events since the system was booted, including lost events due to
331 * modesetting activity.
333 u32 drm_vblank_count(struct drm_device *dev, int crtc)
335 return atomic_read(&dev->_vblank_count[crtc]);
337 EXPORT_SYMBOL(drm_vblank_count);
340 * drm_update_vblank_count - update the master vblank counter
342 * @crtc: counter to update
344 * Call back into the driver to update the appropriate vblank counter
345 * (specified by @crtc). Deal with wraparound, if it occurred, and
346 * update the last read value so we can deal with wraparound on the next
349 * Only necessary when going from off->on, to account for frames we
350 * didn't get an interrupt for.
352 * Note: caller must hold dev->vbl_lock since this reads & writes
353 * device vblank fields.
355 static void drm_update_vblank_count(struct drm_device *dev, int crtc)
357 u32 cur_vblank, diff;
360 * Interrupts were disabled prior to this call, so deal with counter
362 * NOTE! It's possible we lost a full dev->max_vblank_count events
363 * here if the register is small or we had vblank interrupts off for
366 cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
367 diff = cur_vblank - dev->last_vblank[crtc];
368 if (cur_vblank < dev->last_vblank[crtc]) {
369 diff += dev->max_vblank_count;
371 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
372 crtc, dev->last_vblank[crtc], cur_vblank, diff);
375 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
378 atomic_add(diff, &dev->_vblank_count[crtc]);
382 * drm_vblank_get - get a reference count on vblank events
384 * @crtc: which CRTC to own
386 * Acquire a reference count on vblank events to avoid having them disabled
390 * Zero on success, nonzero on failure.
392 int drm_vblank_get(struct drm_device *dev, int crtc)
394 unsigned long irqflags;
397 spin_lock_irqsave(&dev->vbl_lock, irqflags);
398 /* Going from 0->1 means we have to enable interrupts again */
399 if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1 &&
400 !dev->vblank_enabled[crtc]) {
401 ret = dev->driver->enable_vblank(dev, crtc);
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->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);
537 seq = drm_vblank_count(dev, crtc);
539 switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
540 case _DRM_VBLANK_RELATIVE:
541 vblwait->request.sequence += seq;
542 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
543 case _DRM_VBLANK_ABSOLUTE:
550 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
551 (seq - vblwait->request.sequence) <= (1<<23)) {
552 vblwait->request.sequence = seq + 1;
555 if (flags & _DRM_VBLANK_SIGNAL) {
556 unsigned long irqflags;
557 struct list_head *vbl_sigs = &dev->vbl_sigs[crtc];
558 struct drm_vbl_sig *vbl_sig;
560 spin_lock_irqsave(&dev->vbl_lock, irqflags);
562 /* Check if this task has already scheduled the same signal
563 * for the same vblank sequence number; nothing to be done in
566 list_for_each_entry(vbl_sig, vbl_sigs, head) {
567 if (vbl_sig->sequence == vblwait->request.sequence
568 && vbl_sig->info.si_signo ==
569 vblwait->request.signal
570 && vbl_sig->task == current) {
571 spin_unlock_irqrestore(&dev->vbl_lock,
573 vblwait->reply.sequence = seq;
578 if (atomic_read(&dev->vbl_signal_pending) >= 100) {
579 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
584 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
586 vbl_sig = drm_calloc(1, sizeof(struct drm_vbl_sig),
593 ret = drm_vblank_get(dev, crtc);
595 drm_free(vbl_sig, sizeof(struct drm_vbl_sig),
600 atomic_inc(&dev->vbl_signal_pending);
602 vbl_sig->sequence = vblwait->request.sequence;
603 vbl_sig->info.si_signo = vblwait->request.signal;
604 vbl_sig->task = current;
606 spin_lock_irqsave(&dev->vbl_lock, irqflags);
608 list_add_tail(&vbl_sig->head, vbl_sigs);
610 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
612 vblwait->reply.sequence = seq;
614 DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
615 ((drm_vblank_count(dev, crtc)
616 - vblwait->request.sequence) <= (1 << 23)));
621 do_gettimeofday(&now);
623 vblwait->reply.tval_sec = now.tv_sec;
624 vblwait->reply.tval_usec = now.tv_usec;
625 vblwait->reply.sequence = drm_vblank_count(dev, crtc);
630 drm_vblank_put(dev, crtc);
635 * Send the VBLANK signals.
637 * \param dev DRM device.
638 * \param crtc CRTC where the vblank event occurred
640 * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
642 * If a signal is not requested, then calls vblank_wait().
644 static void drm_vbl_send_signals(struct drm_device * dev, int crtc)
646 struct drm_vbl_sig *vbl_sig, *tmp;
647 struct list_head *vbl_sigs;
648 unsigned int vbl_seq;
651 spin_lock_irqsave(&dev->vbl_lock, flags);
653 vbl_sigs = &dev->vbl_sigs[crtc];
654 vbl_seq = drm_vblank_count(dev, crtc);
656 list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) {
657 if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) {
658 vbl_sig->info.si_code = vbl_seq;
659 send_sig_info(vbl_sig->info.si_signo,
660 &vbl_sig->info, vbl_sig->task);
662 list_del(&vbl_sig->head);
664 drm_free(vbl_sig, sizeof(*vbl_sig),
666 atomic_dec(&dev->vbl_signal_pending);
667 drm_vblank_put(dev, crtc);
671 spin_unlock_irqrestore(&dev->vbl_lock, flags);
675 * drm_handle_vblank - handle a vblank event
677 * @crtc: where this event occurred
679 * Drivers should call this routine in their vblank interrupt handlers to
680 * update the vblank counter and send any signals that may be pending.
682 void drm_handle_vblank(struct drm_device *dev, int crtc)
684 atomic_inc(&dev->_vblank_count[crtc]);
685 DRM_WAKEUP(&dev->vbl_queue[crtc]);
686 drm_vbl_send_signals(dev, crtc);
688 EXPORT_SYMBOL(drm_handle_vblank);
691 * Tasklet wrapper function.
693 * \param data DRM device in disguise.
695 * Attempts to grab the HW lock and calls the driver callback on success. On
696 * failure, leave the lock marked as contended so the callback can be called
699 static void drm_locked_tasklet_func(unsigned long data)
701 struct drm_device *dev = (struct drm_device *)data;
702 unsigned long irqflags;
704 spin_lock_irqsave(&dev->tasklet_lock, irqflags);
706 if (!dev->locked_tasklet_func ||
707 !drm_lock_take(&dev->lock,
708 DRM_KERNEL_CONTEXT)) {
709 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
713 dev->lock.lock_time = jiffies;
714 atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
716 dev->locked_tasklet_func(dev);
718 drm_lock_free(&dev->lock,
721 dev->locked_tasklet_func = NULL;
723 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
727 * Schedule a tasklet to call back a driver hook with the HW lock held.
729 * \param dev DRM device.
730 * \param func Driver callback.
732 * This is intended for triggering actions that require the HW lock from an
733 * interrupt handler. The lock will be grabbed ASAP after the interrupt handler
734 * completes. Note that the callback may be called from interrupt or process
735 * context, it must not make any assumptions about this. Also, the HW lock will
736 * be held with the kernel context or any client context.
738 void drm_locked_tasklet(struct drm_device *dev, void (*func)(struct drm_device *))
740 unsigned long irqflags;
741 static DECLARE_TASKLET(drm_tasklet, drm_locked_tasklet_func, 0);
743 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ) ||
744 test_bit(TASKLET_STATE_SCHED, &drm_tasklet.state))
747 spin_lock_irqsave(&dev->tasklet_lock, irqflags);
749 if (dev->locked_tasklet_func) {
750 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
754 dev->locked_tasklet_func = func;
756 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
758 drm_tasklet.data = (unsigned long)dev;
760 tasklet_hi_schedule(&drm_tasklet);
762 EXPORT_SYMBOL(drm_locked_tasklet);