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.
37 #include "drm_trace.h"
39 #include <linux/interrupt.h> /* For task queue support */
40 #include <linux/slab.h>
42 #include <linux/vgaarb.h>
44 * Get interrupt from bus id.
46 * \param inode device inode.
47 * \param file_priv DRM file private.
49 * \param arg user argument, pointing to a drm_irq_busid structure.
50 * \return zero on success or a negative number on failure.
52 * Finds the PCI device with the specified bus id and gets its IRQ number.
53 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
54 * to that of the device that this DRM instance attached to.
56 int drm_irq_by_busid(struct drm_device *dev, void *data,
57 struct drm_file *file_priv)
59 struct drm_irq_busid *p = data;
61 if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE))
64 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
67 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
68 (p->busnum & 0xff) != dev->pdev->bus->number ||
69 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
72 p->irq = dev->pdev->irq;
74 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
80 static void vblank_disable_fn(unsigned long arg)
82 struct drm_device *dev = (struct drm_device *)arg;
83 unsigned long irqflags;
86 if (!dev->vblank_disable_allowed)
89 for (i = 0; i < dev->num_crtcs; i++) {
90 spin_lock_irqsave(&dev->vbl_lock, irqflags);
91 if (atomic_read(&dev->vblank_refcount[i]) == 0 &&
92 dev->vblank_enabled[i]) {
93 DRM_DEBUG("disabling vblank on crtc %d\n", i);
95 dev->driver->get_vblank_counter(dev, i);
96 dev->driver->disable_vblank(dev, i);
97 dev->vblank_enabled[i] = 0;
99 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
103 void drm_vblank_cleanup(struct drm_device *dev)
105 /* Bail if the driver didn't call drm_vblank_init() */
106 if (dev->num_crtcs == 0)
109 del_timer(&dev->vblank_disable_timer);
111 vblank_disable_fn((unsigned long)dev);
113 kfree(dev->vbl_queue);
114 kfree(dev->_vblank_count);
115 kfree(dev->vblank_refcount);
116 kfree(dev->vblank_enabled);
117 kfree(dev->last_vblank);
118 kfree(dev->last_vblank_wait);
119 kfree(dev->vblank_inmodeset);
123 EXPORT_SYMBOL(drm_vblank_cleanup);
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 dev->num_crtcs = num_crtcs;
134 dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs,
139 dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL);
140 if (!dev->_vblank_count)
143 dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs,
145 if (!dev->vblank_refcount)
148 dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
149 if (!dev->vblank_enabled)
152 dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
153 if (!dev->last_vblank)
156 dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
157 if (!dev->last_vblank_wait)
160 dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
161 if (!dev->vblank_inmodeset)
164 /* Zero per-crtc vblank stuff */
165 for (i = 0; i < num_crtcs; i++) {
166 init_waitqueue_head(&dev->vbl_queue[i]);
167 atomic_set(&dev->_vblank_count[i], 0);
168 atomic_set(&dev->vblank_refcount[i], 0);
171 dev->vblank_disable_allowed = 0;
175 drm_vblank_cleanup(dev);
178 EXPORT_SYMBOL(drm_vblank_init);
180 static void drm_irq_vgaarb_nokms(void *cookie, bool state)
182 struct drm_device *dev = cookie;
184 if (dev->driver->vgaarb_irq) {
185 dev->driver->vgaarb_irq(dev, state);
189 if (!dev->irq_enabled)
193 dev->driver->irq_uninstall(dev);
195 dev->driver->irq_preinstall(dev);
196 dev->driver->irq_postinstall(dev);
201 * Install IRQ handler.
203 * \param dev DRM device.
205 * Initializes the IRQ related data. Installs the handler, calling the driver
206 * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
207 * before and after the installation.
209 int drm_irq_install(struct drm_device *dev)
212 unsigned long sh_flags = 0;
215 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
218 if (drm_dev_to_irq(dev) == 0)
221 mutex_lock(&dev->struct_mutex);
223 /* Driver must have been initialized */
224 if (!dev->dev_private) {
225 mutex_unlock(&dev->struct_mutex);
229 if (dev->irq_enabled) {
230 mutex_unlock(&dev->struct_mutex);
233 dev->irq_enabled = 1;
234 mutex_unlock(&dev->struct_mutex);
236 DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
238 /* Before installing handler */
239 dev->driver->irq_preinstall(dev);
241 /* Install handler */
242 if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
243 sh_flags = IRQF_SHARED;
246 irqname = dev->devname;
248 irqname = dev->driver->name;
250 ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler,
251 sh_flags, irqname, dev);
254 mutex_lock(&dev->struct_mutex);
255 dev->irq_enabled = 0;
256 mutex_unlock(&dev->struct_mutex);
260 if (!drm_core_check_feature(dev, DRIVER_MODESET))
261 vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL);
263 /* After installing handler */
264 ret = dev->driver->irq_postinstall(dev);
266 mutex_lock(&dev->struct_mutex);
267 dev->irq_enabled = 0;
268 mutex_unlock(&dev->struct_mutex);
273 EXPORT_SYMBOL(drm_irq_install);
276 * Uninstall the IRQ handler.
278 * \param dev DRM device.
280 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
282 int drm_irq_uninstall(struct drm_device * dev)
284 unsigned long irqflags;
287 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
290 mutex_lock(&dev->struct_mutex);
291 irq_enabled = dev->irq_enabled;
292 dev->irq_enabled = 0;
293 mutex_unlock(&dev->struct_mutex);
296 * Wake up any waiters so they don't hang.
298 spin_lock_irqsave(&dev->vbl_lock, irqflags);
299 for (i = 0; i < dev->num_crtcs; i++) {
300 DRM_WAKEUP(&dev->vbl_queue[i]);
301 dev->vblank_enabled[i] = 0;
302 dev->last_vblank[i] = dev->driver->get_vblank_counter(dev, i);
304 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
309 DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
311 if (!drm_core_check_feature(dev, DRIVER_MODESET))
312 vga_client_register(dev->pdev, NULL, NULL, NULL);
314 dev->driver->irq_uninstall(dev);
316 free_irq(drm_dev_to_irq(dev), dev);
320 EXPORT_SYMBOL(drm_irq_uninstall);
325 * \param inode device inode.
326 * \param file_priv DRM file private.
327 * \param cmd command.
328 * \param arg user argument, pointing to a drm_control structure.
329 * \return zero on success or a negative number on failure.
331 * Calls irq_install() or irq_uninstall() according to \p arg.
333 int drm_control(struct drm_device *dev, void *data,
334 struct drm_file *file_priv)
336 struct drm_control *ctl = data;
338 /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
342 case DRM_INST_HANDLER:
343 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
345 if (drm_core_check_feature(dev, DRIVER_MODESET))
348 * Currently ARM DRI, there is no way get Xserver to know the
349 * platform irq number.
351 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
352 ctl->irq != drm_dev_to_irq(dev))
354 return drm_irq_install(dev);
355 case DRM_UNINST_HANDLER:
356 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
358 if (drm_core_check_feature(dev, DRIVER_MODESET))
360 return drm_irq_uninstall(dev);
367 * drm_vblank_count - retrieve "cooked" vblank counter value
369 * @crtc: which counter to retrieve
371 * Fetches the "cooked" vblank count value that represents the number of
372 * vblank events since the system was booted, including lost events due to
373 * modesetting activity.
375 u32 drm_vblank_count(struct drm_device *dev, int crtc)
377 return atomic_read(&dev->_vblank_count[crtc]);
379 EXPORT_SYMBOL(drm_vblank_count);
382 * drm_update_vblank_count - update the master vblank counter
384 * @crtc: counter to update
386 * Call back into the driver to update the appropriate vblank counter
387 * (specified by @crtc). Deal with wraparound, if it occurred, and
388 * update the last read value so we can deal with wraparound on the next
391 * Only necessary when going from off->on, to account for frames we
392 * didn't get an interrupt for.
394 * Note: caller must hold dev->vbl_lock since this reads & writes
395 * device vblank fields.
397 static void drm_update_vblank_count(struct drm_device *dev, int crtc)
399 u32 cur_vblank, diff;
402 * Interrupts were disabled prior to this call, so deal with counter
404 * NOTE! It's possible we lost a full dev->max_vblank_count events
405 * here if the register is small or we had vblank interrupts off for
408 cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
409 diff = cur_vblank - dev->last_vblank[crtc];
410 if (cur_vblank < dev->last_vblank[crtc]) {
411 diff += dev->max_vblank_count;
413 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
414 crtc, dev->last_vblank[crtc], cur_vblank, diff);
417 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
420 atomic_add(diff, &dev->_vblank_count[crtc]);
424 * drm_vblank_get - get a reference count on vblank events
426 * @crtc: which CRTC to own
428 * Acquire a reference count on vblank events to avoid having them disabled
432 * Zero on success, nonzero on failure.
434 int drm_vblank_get(struct drm_device *dev, int crtc)
436 unsigned long irqflags;
439 spin_lock_irqsave(&dev->vbl_lock, irqflags);
440 /* Going from 0->1 means we have to enable interrupts again */
441 if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) {
442 if (!dev->vblank_enabled[crtc]) {
443 ret = dev->driver->enable_vblank(dev, crtc);
444 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret);
446 atomic_dec(&dev->vblank_refcount[crtc]);
448 dev->vblank_enabled[crtc] = 1;
449 drm_update_vblank_count(dev, crtc);
453 if (!dev->vblank_enabled[crtc]) {
454 atomic_dec(&dev->vblank_refcount[crtc]);
458 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
462 EXPORT_SYMBOL(drm_vblank_get);
465 * drm_vblank_put - give up ownership of vblank events
467 * @crtc: which counter to give up
469 * Release ownership of a given vblank counter, turning off interrupts
472 void drm_vblank_put(struct drm_device *dev, int crtc)
474 BUG_ON (atomic_read (&dev->vblank_refcount[crtc]) == 0);
476 /* Last user schedules interrupt disable */
477 if (atomic_dec_and_test(&dev->vblank_refcount[crtc]))
478 mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ);
480 EXPORT_SYMBOL(drm_vblank_put);
482 void drm_vblank_off(struct drm_device *dev, int crtc)
484 unsigned long irqflags;
486 spin_lock_irqsave(&dev->vbl_lock, irqflags);
487 dev->driver->disable_vblank(dev, crtc);
488 DRM_WAKEUP(&dev->vbl_queue[crtc]);
489 dev->vblank_enabled[crtc] = 0;
490 dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc);
491 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
493 EXPORT_SYMBOL(drm_vblank_off);
496 * drm_vblank_pre_modeset - account for vblanks across mode sets
498 * @crtc: CRTC in question
499 * @post: post or pre mode set?
501 * Account for vblank events across mode setting events, which will likely
502 * reset the hardware frame counter.
504 void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
506 /* vblank is not initialized (IRQ not installed ?) */
510 * To avoid all the problems that might happen if interrupts
511 * were enabled/disabled around or between these calls, we just
512 * have the kernel take a reference on the CRTC (just once though
513 * to avoid corrupting the count if multiple, mismatch calls occur),
514 * so that interrupts remain enabled in the interim.
516 if (!dev->vblank_inmodeset[crtc]) {
517 dev->vblank_inmodeset[crtc] = 0x1;
518 if (drm_vblank_get(dev, crtc) == 0)
519 dev->vblank_inmodeset[crtc] |= 0x2;
522 EXPORT_SYMBOL(drm_vblank_pre_modeset);
524 void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
526 unsigned long irqflags;
528 if (dev->vblank_inmodeset[crtc]) {
529 spin_lock_irqsave(&dev->vbl_lock, irqflags);
530 dev->vblank_disable_allowed = 1;
531 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
533 if (dev->vblank_inmodeset[crtc] & 0x2)
534 drm_vblank_put(dev, crtc);
536 dev->vblank_inmodeset[crtc] = 0;
539 EXPORT_SYMBOL(drm_vblank_post_modeset);
542 * drm_modeset_ctl - handle vblank event counter changes across mode switch
543 * @DRM_IOCTL_ARGS: standard ioctl arguments
545 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
546 * ioctls around modesetting so that any lost vblank events are accounted for.
548 * Generally the counter will reset across mode sets. If interrupts are
549 * enabled around this call, we don't have to do anything since the counter
550 * will have already been incremented.
552 int drm_modeset_ctl(struct drm_device *dev, void *data,
553 struct drm_file *file_priv)
555 struct drm_modeset_ctl *modeset = data;
558 /* If drm_vblank_init() hasn't been called yet, just no-op */
562 crtc = modeset->crtc;
563 if (crtc >= dev->num_crtcs) {
568 switch (modeset->cmd) {
569 case _DRM_PRE_MODESET:
570 drm_vblank_pre_modeset(dev, crtc);
572 case _DRM_POST_MODESET:
573 drm_vblank_post_modeset(dev, crtc);
584 static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
585 union drm_wait_vblank *vblwait,
586 struct drm_file *file_priv)
588 struct drm_pending_vblank_event *e;
593 e = kzalloc(sizeof *e, GFP_KERNEL);
598 e->base.pid = current->pid;
599 e->event.base.type = DRM_EVENT_VBLANK;
600 e->event.base.length = sizeof e->event;
601 e->event.user_data = vblwait->request.signal;
602 e->base.event = &e->event.base;
603 e->base.file_priv = file_priv;
604 e->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
606 do_gettimeofday(&now);
608 spin_lock_irqsave(&dev->event_lock, flags);
610 if (file_priv->event_space < sizeof e->event) {
611 spin_unlock_irqrestore(&dev->event_lock, flags);
616 file_priv->event_space -= sizeof e->event;
617 seq = drm_vblank_count(dev, pipe);
618 if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) &&
619 (seq - vblwait->request.sequence) <= (1 << 23)) {
620 vblwait->request.sequence = seq + 1;
621 vblwait->reply.sequence = vblwait->request.sequence;
624 DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n",
625 vblwait->request.sequence, seq, pipe);
627 trace_drm_vblank_event_queued(current->pid, pipe,
628 vblwait->request.sequence);
630 e->event.sequence = vblwait->request.sequence;
631 if ((seq - vblwait->request.sequence) <= (1 << 23)) {
632 e->event.tv_sec = now.tv_sec;
633 e->event.tv_usec = now.tv_usec;
634 drm_vblank_put(dev, e->pipe);
635 list_add_tail(&e->base.link, &e->base.file_priv->event_list);
636 wake_up_interruptible(&e->base.file_priv->event_wait);
637 trace_drm_vblank_event_delivered(current->pid, pipe,
638 vblwait->request.sequence);
640 list_add_tail(&e->base.link, &dev->vblank_event_list);
643 spin_unlock_irqrestore(&dev->event_lock, flags);
651 * \param inode device inode.
652 * \param file_priv DRM file private.
653 * \param cmd command.
654 * \param data user argument, pointing to a drm_wait_vblank structure.
655 * \return zero on success or a negative number on failure.
657 * This function enables the vblank interrupt on the pipe requested, then
658 * sleeps waiting for the requested sequence number to occur, and drops
659 * the vblank interrupt refcount afterwards. (vblank irq disable follows that
660 * after a timeout with no further vblank waits scheduled).
662 int drm_wait_vblank(struct drm_device *dev, void *data,
663 struct drm_file *file_priv)
665 union drm_wait_vblank *vblwait = data;
667 unsigned int flags, seq, crtc;
669 if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled))
672 if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
675 if (vblwait->request.type &
676 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
677 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
678 vblwait->request.type,
679 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
683 flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
684 crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
686 if (crtc >= dev->num_crtcs)
689 ret = drm_vblank_get(dev, crtc);
691 DRM_DEBUG("failed to acquire vblank counter, %d\n", ret);
694 seq = drm_vblank_count(dev, crtc);
696 switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
697 case _DRM_VBLANK_RELATIVE:
698 vblwait->request.sequence += seq;
699 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
700 case _DRM_VBLANK_ABSOLUTE:
707 if (flags & _DRM_VBLANK_EVENT)
708 return drm_queue_vblank_event(dev, crtc, vblwait, file_priv);
710 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
711 (seq - vblwait->request.sequence) <= (1<<23)) {
712 vblwait->request.sequence = seq + 1;
715 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
716 vblwait->request.sequence, crtc);
717 dev->last_vblank_wait[crtc] = vblwait->request.sequence;
718 DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
719 (((drm_vblank_count(dev, crtc) -
720 vblwait->request.sequence) <= (1 << 23)) ||
726 do_gettimeofday(&now);
728 vblwait->reply.tval_sec = now.tv_sec;
729 vblwait->reply.tval_usec = now.tv_usec;
730 vblwait->reply.sequence = drm_vblank_count(dev, crtc);
731 DRM_DEBUG("returning %d to client\n",
732 vblwait->reply.sequence);
734 DRM_DEBUG("vblank wait interrupted by signal\n");
738 drm_vblank_put(dev, crtc);
742 void drm_handle_vblank_events(struct drm_device *dev, int crtc)
744 struct drm_pending_vblank_event *e, *t;
749 do_gettimeofday(&now);
750 seq = drm_vblank_count(dev, crtc);
752 spin_lock_irqsave(&dev->event_lock, flags);
754 list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
757 if ((seq - e->event.sequence) > (1<<23))
760 DRM_DEBUG("vblank event on %d, current %d\n",
761 e->event.sequence, seq);
763 e->event.sequence = seq;
764 e->event.tv_sec = now.tv_sec;
765 e->event.tv_usec = now.tv_usec;
766 drm_vblank_put(dev, e->pipe);
767 list_move_tail(&e->base.link, &e->base.file_priv->event_list);
768 wake_up_interruptible(&e->base.file_priv->event_wait);
769 trace_drm_vblank_event_delivered(e->base.pid, e->pipe,
773 spin_unlock_irqrestore(&dev->event_lock, flags);
775 trace_drm_vblank_event(crtc, seq);
779 * drm_handle_vblank - handle a vblank event
781 * @crtc: where this event occurred
783 * Drivers should call this routine in their vblank interrupt handlers to
784 * update the vblank counter and send any signals that may be pending.
786 void drm_handle_vblank(struct drm_device *dev, int crtc)
791 atomic_inc(&dev->_vblank_count[crtc]);
792 DRM_WAKEUP(&dev->vbl_queue[crtc]);
793 drm_handle_vblank_events(dev, crtc);
795 EXPORT_SYMBOL(drm_handle_vblank);