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 for (i = 0; i < dev->num_crtcs; i++) {
81 spin_lock_irqsave(&dev->vbl_lock, irqflags);
82 if (atomic_read(&dev->vblank_refcount[i]) == 0 &&
83 dev->vblank_enabled[i]) {
84 dev->driver->disable_vblank(dev, i);
85 dev->vblank_enabled[i] = 0;
87 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
91 static void drm_vblank_cleanup(struct drm_device *dev)
93 /* Bail if the driver didn't call drm_vblank_init() */
94 if (dev->num_crtcs == 0)
97 del_timer(&dev->vblank_disable_timer);
99 vblank_disable_fn((unsigned long)dev);
101 drm_free(dev->vbl_queue, sizeof(*dev->vbl_queue) * dev->num_crtcs,
103 drm_free(dev->vbl_sigs, sizeof(*dev->vbl_sigs) * dev->num_crtcs,
105 drm_free(dev->_vblank_count, sizeof(*dev->_vblank_count) *
106 dev->num_crtcs, DRM_MEM_DRIVER);
107 drm_free(dev->vblank_refcount, sizeof(*dev->vblank_refcount) *
108 dev->num_crtcs, DRM_MEM_DRIVER);
109 drm_free(dev->vblank_enabled, sizeof(*dev->vblank_enabled) *
110 dev->num_crtcs, DRM_MEM_DRIVER);
111 drm_free(dev->last_vblank, sizeof(*dev->last_vblank) * dev->num_crtcs,
113 drm_free(dev->vblank_premodeset, sizeof(*dev->vblank_premodeset) *
114 dev->num_crtcs, DRM_MEM_DRIVER);
115 drm_free(dev->vblank_offset, sizeof(*dev->vblank_offset) * dev->num_crtcs,
121 int drm_vblank_init(struct drm_device *dev, int num_crtcs)
123 int i, ret = -ENOMEM;
125 setup_timer(&dev->vblank_disable_timer, vblank_disable_fn,
127 init_timer_deferrable(&dev->vblank_disable_timer);
128 spin_lock_init(&dev->vbl_lock);
129 atomic_set(&dev->vbl_signal_pending, 0);
130 dev->num_crtcs = num_crtcs;
132 dev->vbl_queue = drm_alloc(sizeof(wait_queue_head_t) * num_crtcs,
137 dev->vbl_sigs = drm_alloc(sizeof(struct list_head) * num_crtcs,
142 dev->_vblank_count = drm_alloc(sizeof(atomic_t) * num_crtcs,
144 if (!dev->_vblank_count)
147 dev->vblank_refcount = drm_alloc(sizeof(atomic_t) * num_crtcs,
149 if (!dev->vblank_refcount)
152 dev->vblank_enabled = drm_calloc(num_crtcs, sizeof(int),
154 if (!dev->vblank_enabled)
157 dev->last_vblank = drm_calloc(num_crtcs, sizeof(u32), DRM_MEM_DRIVER);
158 if (!dev->last_vblank)
161 dev->vblank_premodeset = drm_calloc(num_crtcs, sizeof(u32),
163 if (!dev->vblank_premodeset)
166 dev->vblank_offset = drm_calloc(num_crtcs, sizeof(u32), DRM_MEM_DRIVER);
167 if (!dev->vblank_offset)
170 /* Zero per-crtc vblank stuff */
171 for (i = 0; i < num_crtcs; i++) {
172 init_waitqueue_head(&dev->vbl_queue[i]);
173 INIT_LIST_HEAD(&dev->vbl_sigs[i]);
174 atomic_set(&dev->_vblank_count[i], 0);
175 atomic_set(&dev->vblank_refcount[i], 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;
200 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
203 if (dev->pdev->irq == 0)
206 mutex_lock(&dev->struct_mutex);
208 /* Driver must have been initialized */
209 if (!dev->dev_private) {
210 mutex_unlock(&dev->struct_mutex);
214 if (dev->irq_enabled) {
215 mutex_unlock(&dev->struct_mutex);
218 dev->irq_enabled = 1;
219 mutex_unlock(&dev->struct_mutex);
221 DRM_DEBUG("irq=%d\n", dev->pdev->irq);
223 /* Before installing handler */
224 dev->driver->irq_preinstall(dev);
226 /* Install handler */
227 if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
228 sh_flags = IRQF_SHARED;
230 ret = request_irq(dev->pdev->irq, dev->driver->irq_handler,
231 sh_flags, dev->devname, dev);
233 mutex_lock(&dev->struct_mutex);
234 dev->irq_enabled = 0;
235 mutex_unlock(&dev->struct_mutex);
238 /* Expose the device irq to device drivers that want to export it for
241 dev->irq = dev->pdev->irq;
243 /* After installing handler */
244 ret = dev->driver->irq_postinstall(dev);
246 mutex_lock(&dev->struct_mutex);
247 dev->irq_enabled = 0;
248 mutex_unlock(&dev->struct_mutex);
253 EXPORT_SYMBOL(drm_irq_install);
256 * Uninstall the IRQ handler.
258 * \param dev DRM device.
260 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
262 int drm_irq_uninstall(struct drm_device * dev)
266 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
269 mutex_lock(&dev->struct_mutex);
270 irq_enabled = dev->irq_enabled;
271 dev->irq_enabled = 0;
272 mutex_unlock(&dev->struct_mutex);
277 DRM_DEBUG("irq=%d\n", dev->pdev->irq);
279 dev->driver->irq_uninstall(dev);
281 free_irq(dev->pdev->irq, dev);
283 drm_vblank_cleanup(dev);
285 dev->locked_tasklet_func = NULL;
289 EXPORT_SYMBOL(drm_irq_uninstall);
294 * \param inode device inode.
295 * \param file_priv DRM file private.
296 * \param cmd command.
297 * \param arg user argument, pointing to a drm_control structure.
298 * \return zero on success or a negative number on failure.
300 * Calls irq_install() or irq_uninstall() according to \p arg.
302 int drm_control(struct drm_device *dev, void *data,
303 struct drm_file *file_priv)
305 struct drm_control *ctl = data;
307 /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
311 case DRM_INST_HANDLER:
312 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
314 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
315 ctl->irq != dev->pdev->irq)
317 return drm_irq_install(dev);
318 case DRM_UNINST_HANDLER:
319 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
321 return drm_irq_uninstall(dev);
328 * drm_vblank_count - retrieve "cooked" vblank counter value
330 * @crtc: which counter to retrieve
332 * Fetches the "cooked" vblank count value that represents the number of
333 * vblank events since the system was booted, including lost events due to
334 * modesetting activity.
336 u32 drm_vblank_count(struct drm_device *dev, int crtc)
338 return atomic_read(&dev->_vblank_count[crtc]) +
339 dev->vblank_offset[crtc];
341 EXPORT_SYMBOL(drm_vblank_count);
344 * drm_update_vblank_count - update the master vblank counter
346 * @crtc: counter to update
348 * Call back into the driver to update the appropriate vblank counter
349 * (specified by @crtc). Deal with wraparound, if it occurred, and
350 * update the last read value so we can deal with wraparound on the next
353 void drm_update_vblank_count(struct drm_device *dev, int crtc)
355 unsigned long irqflags;
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 spin_lock_irqsave(&dev->vbl_lock, irqflags);
367 if (cur_vblank < dev->last_vblank[crtc]) {
368 diff = dev->max_vblank_count -
369 dev->last_vblank[crtc];
372 diff = cur_vblank - dev->last_vblank[crtc];
374 dev->last_vblank[crtc] = cur_vblank;
375 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
377 atomic_add(diff, &dev->_vblank_count[crtc]);
379 EXPORT_SYMBOL(drm_update_vblank_count);
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
387 * while in use. Note callers will probably want to update the master counter
388 * using drm_update_vblank_count() above before calling this routine so that
389 * wakeups occur on the right vblank event.
392 * Zero on success, nonzero on failure.
394 int drm_vblank_get(struct drm_device *dev, int crtc)
396 unsigned long irqflags;
399 spin_lock_irqsave(&dev->vbl_lock, irqflags);
400 /* Going from 0->1 means we have to enable interrupts again */
401 if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1 &&
402 !dev->vblank_enabled[crtc]) {
403 ret = dev->driver->enable_vblank(dev, crtc);
405 atomic_dec(&dev->vblank_refcount[crtc]);
407 dev->vblank_enabled[crtc] = 1;
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 int drm_modeset_ctl(struct drm_device *dev, void *data,
439 struct drm_file *file_priv)
441 struct drm_modeset_ctl *modeset = data;
445 crtc = modeset->crtc;
446 if (crtc >= dev->num_crtcs) {
451 switch (modeset->cmd) {
452 case _DRM_PRE_MODESET:
453 dev->vblank_premodeset[crtc] =
454 dev->driver->get_vblank_counter(dev, crtc);
456 case _DRM_POST_MODESET:
457 new = dev->driver->get_vblank_counter(dev, crtc);
458 dev->vblank_offset[crtc] = dev->vblank_premodeset[crtc] - new;
472 * \param inode device inode.
473 * \param file_priv DRM file private.
474 * \param cmd command.
475 * \param data user argument, pointing to a drm_wait_vblank structure.
476 * \return zero on success or a negative number on failure.
478 * Verifies the IRQ is installed.
480 * If a signal is requested checks if this task has already scheduled the same signal
481 * for the same vblank sequence number - nothing to be done in
482 * that case. If the number of tasks waiting for the interrupt exceeds 100 the
483 * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
486 * If a signal is not requested, then calls vblank_wait().
488 int drm_wait_vblank(struct drm_device *dev, void *data,
489 struct drm_file *file_priv)
491 union drm_wait_vblank *vblwait = data;
494 unsigned int flags, seq, crtc;
496 if ((!dev->pdev->irq) || (!dev->irq_enabled))
499 if (vblwait->request.type &
500 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
501 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
502 vblwait->request.type,
503 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
507 flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
508 crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
510 if (crtc >= dev->num_crtcs)
513 drm_update_vblank_count(dev, crtc);
514 seq = drm_vblank_count(dev, crtc);
516 switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
517 case _DRM_VBLANK_RELATIVE:
518 vblwait->request.sequence += seq;
519 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
520 case _DRM_VBLANK_ABSOLUTE:
526 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
527 (seq - vblwait->request.sequence) <= (1<<23)) {
528 vblwait->request.sequence = seq + 1;
531 if (flags & _DRM_VBLANK_SIGNAL) {
532 unsigned long irqflags;
533 struct list_head *vbl_sigs = &dev->vbl_sigs[crtc];
534 struct drm_vbl_sig *vbl_sig;
536 spin_lock_irqsave(&dev->vbl_lock, irqflags);
538 /* Check if this task has already scheduled the same signal
539 * for the same vblank sequence number; nothing to be done in
542 list_for_each_entry(vbl_sig, vbl_sigs, head) {
543 if (vbl_sig->sequence == vblwait->request.sequence
544 && vbl_sig->info.si_signo ==
545 vblwait->request.signal
546 && vbl_sig->task == current) {
547 spin_unlock_irqrestore(&dev->vbl_lock,
549 vblwait->reply.sequence = seq;
554 if (atomic_read(&dev->vbl_signal_pending) >= 100) {
555 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
559 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
561 vbl_sig = drm_calloc(1, sizeof(struct drm_vbl_sig),
566 ret = drm_vblank_get(dev, crtc);
568 drm_free(vbl_sig, sizeof(struct drm_vbl_sig),
573 atomic_inc(&dev->vbl_signal_pending);
575 vbl_sig->sequence = vblwait->request.sequence;
576 vbl_sig->info.si_signo = vblwait->request.signal;
577 vbl_sig->task = current;
579 spin_lock_irqsave(&dev->vbl_lock, irqflags);
581 list_add_tail(&vbl_sig->head, vbl_sigs);
583 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
585 vblwait->reply.sequence = seq;
587 unsigned long cur_vblank;
589 ret = drm_vblank_get(dev, crtc);
592 DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
593 (((cur_vblank = drm_vblank_count(dev, crtc))
594 - vblwait->request.sequence) <= (1 << 23)));
595 drm_vblank_put(dev, crtc);
596 do_gettimeofday(&now);
598 vblwait->reply.tval_sec = now.tv_sec;
599 vblwait->reply.tval_usec = now.tv_usec;
600 vblwait->reply.sequence = cur_vblank;
608 * Send the VBLANK signals.
610 * \param dev DRM device.
611 * \param crtc CRTC where the vblank event occurred
613 * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
615 * If a signal is not requested, then calls vblank_wait().
617 static void drm_vbl_send_signals(struct drm_device * dev, int crtc)
619 struct drm_vbl_sig *vbl_sig, *tmp;
620 struct list_head *vbl_sigs;
621 unsigned int vbl_seq;
624 spin_lock_irqsave(&dev->vbl_lock, flags);
626 vbl_sigs = &dev->vbl_sigs[crtc];
627 vbl_seq = drm_vblank_count(dev, crtc);
629 list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) {
630 if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) {
631 vbl_sig->info.si_code = vbl_seq;
632 send_sig_info(vbl_sig->info.si_signo,
633 &vbl_sig->info, vbl_sig->task);
635 list_del(&vbl_sig->head);
637 drm_free(vbl_sig, sizeof(*vbl_sig),
639 atomic_dec(&dev->vbl_signal_pending);
640 drm_vblank_put(dev, crtc);
644 spin_unlock_irqrestore(&dev->vbl_lock, flags);
648 * drm_handle_vblank - handle a vblank event
650 * @crtc: where this event occurred
652 * Drivers should call this routine in their vblank interrupt handlers to
653 * update the vblank counter and send any signals that may be pending.
655 void drm_handle_vblank(struct drm_device *dev, int crtc)
657 drm_update_vblank_count(dev, crtc);
658 DRM_WAKEUP(&dev->vbl_queue[crtc]);
659 drm_vbl_send_signals(dev, crtc);
661 EXPORT_SYMBOL(drm_handle_vblank);
664 * Tasklet wrapper function.
666 * \param data DRM device in disguise.
668 * Attempts to grab the HW lock and calls the driver callback on success. On
669 * failure, leave the lock marked as contended so the callback can be called
672 static void drm_locked_tasklet_func(unsigned long data)
674 struct drm_device *dev = (struct drm_device *)data;
675 unsigned long irqflags;
677 spin_lock_irqsave(&dev->tasklet_lock, irqflags);
679 if (!dev->locked_tasklet_func ||
680 !drm_lock_take(&dev->lock,
681 DRM_KERNEL_CONTEXT)) {
682 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
686 dev->lock.lock_time = jiffies;
687 atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
689 dev->locked_tasklet_func(dev);
691 drm_lock_free(&dev->lock,
694 dev->locked_tasklet_func = NULL;
696 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
700 * Schedule a tasklet to call back a driver hook with the HW lock held.
702 * \param dev DRM device.
703 * \param func Driver callback.
705 * This is intended for triggering actions that require the HW lock from an
706 * interrupt handler. The lock will be grabbed ASAP after the interrupt handler
707 * completes. Note that the callback may be called from interrupt or process
708 * context, it must not make any assumptions about this. Also, the HW lock will
709 * be held with the kernel context or any client context.
711 void drm_locked_tasklet(struct drm_device *dev, void (*func)(struct drm_device *))
713 unsigned long irqflags;
714 static DECLARE_TASKLET(drm_tasklet, drm_locked_tasklet_func, 0);
716 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ) ||
717 test_bit(TASKLET_STATE_SCHED, &drm_tasklet.state))
720 spin_lock_irqsave(&dev->tasklet_lock, irqflags);
722 if (dev->locked_tasklet_func) {
723 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
727 dev->locked_tasklet_func = func;
729 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
731 drm_tasklet.data = (unsigned long)dev;
733 tasklet_hi_schedule(&drm_tasklet);
735 EXPORT_SYMBOL(drm_locked_tasklet);