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 */
40 #include <linux/vgaarb.h>
42 * Get interrupt from bus id.
44 * \param inode device inode.
45 * \param file_priv DRM file private.
47 * \param arg user argument, pointing to a drm_irq_busid structure.
48 * \return zero on success or a negative number on failure.
50 * Finds the PCI device with the specified bus id and gets its IRQ number.
51 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
52 * to that of the device that this DRM instance attached to.
54 int drm_irq_by_busid(struct drm_device *dev, void *data,
55 struct drm_file *file_priv)
57 struct drm_irq_busid *p = data;
59 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
62 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
63 (p->busnum & 0xff) != dev->pdev->bus->number ||
64 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
67 p->irq = dev->pdev->irq;
69 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
75 static void vblank_disable_fn(unsigned long arg)
77 struct drm_device *dev = (struct drm_device *)arg;
78 unsigned long irqflags;
81 if (!dev->vblank_disable_allowed)
84 for (i = 0; i < dev->num_crtcs; i++) {
85 spin_lock_irqsave(&dev->vbl_lock, irqflags);
86 if (atomic_read(&dev->vblank_refcount[i]) == 0 &&
87 dev->vblank_enabled[i]) {
88 DRM_DEBUG("disabling vblank on crtc %d\n", i);
90 dev->driver->get_vblank_counter(dev, i);
91 dev->driver->disable_vblank(dev, i);
92 dev->vblank_enabled[i] = 0;
94 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
98 void drm_vblank_cleanup(struct drm_device *dev)
100 /* Bail if the driver didn't call drm_vblank_init() */
101 if (dev->num_crtcs == 0)
104 del_timer(&dev->vblank_disable_timer);
106 vblank_disable_fn((unsigned long)dev);
108 kfree(dev->vbl_queue);
109 kfree(dev->_vblank_count);
110 kfree(dev->vblank_refcount);
111 kfree(dev->vblank_enabled);
112 kfree(dev->last_vblank);
113 kfree(dev->last_vblank_wait);
114 kfree(dev->vblank_inmodeset);
119 int drm_vblank_init(struct drm_device *dev, int num_crtcs)
121 int i, ret = -ENOMEM;
123 setup_timer(&dev->vblank_disable_timer, vblank_disable_fn,
125 spin_lock_init(&dev->vbl_lock);
126 dev->num_crtcs = num_crtcs;
128 dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs,
133 dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL);
134 if (!dev->_vblank_count)
137 dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs,
139 if (!dev->vblank_refcount)
142 dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
143 if (!dev->vblank_enabled)
146 dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
147 if (!dev->last_vblank)
150 dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
151 if (!dev->last_vblank_wait)
154 dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
155 if (!dev->vblank_inmodeset)
158 /* Zero per-crtc vblank stuff */
159 for (i = 0; i < num_crtcs; i++) {
160 init_waitqueue_head(&dev->vbl_queue[i]);
161 atomic_set(&dev->_vblank_count[i], 0);
162 atomic_set(&dev->vblank_refcount[i], 0);
165 dev->vblank_disable_allowed = 0;
170 drm_vblank_cleanup(dev);
173 EXPORT_SYMBOL(drm_vblank_init);
175 static void drm_irq_vgaarb_nokms(void *cookie, bool state)
177 struct drm_device *dev = cookie;
179 if (dev->driver->vgaarb_irq) {
180 dev->driver->vgaarb_irq(dev, state);
184 if (!dev->irq_enabled)
188 dev->driver->irq_uninstall(dev);
190 dev->driver->irq_preinstall(dev);
191 dev->driver->irq_postinstall(dev);
196 * Install IRQ handler.
198 * \param dev DRM device.
200 * Initializes the IRQ related data. Installs the handler, calling the driver
201 * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
202 * before and after the installation.
204 int drm_irq_install(struct drm_device *dev)
207 unsigned long sh_flags = 0;
210 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
213 if (dev->pdev->irq == 0)
216 mutex_lock(&dev->struct_mutex);
218 /* Driver must have been initialized */
219 if (!dev->dev_private) {
220 mutex_unlock(&dev->struct_mutex);
224 if (dev->irq_enabled) {
225 mutex_unlock(&dev->struct_mutex);
228 dev->irq_enabled = 1;
229 mutex_unlock(&dev->struct_mutex);
231 DRM_DEBUG("irq=%d\n", dev->pdev->irq);
233 /* Before installing handler */
234 dev->driver->irq_preinstall(dev);
236 /* Install handler */
237 if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
238 sh_flags = IRQF_SHARED;
241 irqname = dev->devname;
243 irqname = dev->driver->name;
245 ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler,
246 sh_flags, irqname, dev);
249 mutex_lock(&dev->struct_mutex);
250 dev->irq_enabled = 0;
251 mutex_unlock(&dev->struct_mutex);
255 if (!drm_core_check_feature(dev, DRIVER_MODESET))
256 vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL);
258 /* After installing handler */
259 ret = dev->driver->irq_postinstall(dev);
261 mutex_lock(&dev->struct_mutex);
262 dev->irq_enabled = 0;
263 mutex_unlock(&dev->struct_mutex);
268 EXPORT_SYMBOL(drm_irq_install);
271 * Uninstall the IRQ handler.
273 * \param dev DRM device.
275 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
277 int drm_irq_uninstall(struct drm_device * dev)
279 unsigned long irqflags;
282 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
285 mutex_lock(&dev->struct_mutex);
286 irq_enabled = dev->irq_enabled;
287 dev->irq_enabled = 0;
288 mutex_unlock(&dev->struct_mutex);
291 * Wake up any waiters so they don't hang.
293 spin_lock_irqsave(&dev->vbl_lock, irqflags);
294 for (i = 0; i < dev->num_crtcs; i++) {
295 DRM_WAKEUP(&dev->vbl_queue[i]);
296 dev->vblank_enabled[i] = 0;
297 dev->last_vblank[i] = dev->driver->get_vblank_counter(dev, i);
299 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
304 DRM_DEBUG("irq=%d\n", dev->pdev->irq);
306 if (!drm_core_check_feature(dev, DRIVER_MODESET))
307 vga_client_register(dev->pdev, NULL, NULL, NULL);
309 dev->driver->irq_uninstall(dev);
311 free_irq(dev->pdev->irq, dev);
315 EXPORT_SYMBOL(drm_irq_uninstall);
320 * \param inode device inode.
321 * \param file_priv DRM file private.
322 * \param cmd command.
323 * \param arg user argument, pointing to a drm_control structure.
324 * \return zero on success or a negative number on failure.
326 * Calls irq_install() or irq_uninstall() according to \p arg.
328 int drm_control(struct drm_device *dev, void *data,
329 struct drm_file *file_priv)
331 struct drm_control *ctl = data;
333 /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
337 case DRM_INST_HANDLER:
338 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
340 if (drm_core_check_feature(dev, DRIVER_MODESET))
342 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
343 ctl->irq != dev->pdev->irq)
345 return drm_irq_install(dev);
346 case DRM_UNINST_HANDLER:
347 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
349 if (drm_core_check_feature(dev, DRIVER_MODESET))
351 return drm_irq_uninstall(dev);
358 * drm_vblank_count - retrieve "cooked" vblank counter value
360 * @crtc: which counter to retrieve
362 * Fetches the "cooked" vblank count value that represents the number of
363 * vblank events since the system was booted, including lost events due to
364 * modesetting activity.
366 u32 drm_vblank_count(struct drm_device *dev, int crtc)
368 return atomic_read(&dev->_vblank_count[crtc]);
370 EXPORT_SYMBOL(drm_vblank_count);
373 * drm_update_vblank_count - update the master vblank counter
375 * @crtc: counter to update
377 * Call back into the driver to update the appropriate vblank counter
378 * (specified by @crtc). Deal with wraparound, if it occurred, and
379 * update the last read value so we can deal with wraparound on the next
382 * Only necessary when going from off->on, to account for frames we
383 * didn't get an interrupt for.
385 * Note: caller must hold dev->vbl_lock since this reads & writes
386 * device vblank fields.
388 static void drm_update_vblank_count(struct drm_device *dev, int crtc)
390 u32 cur_vblank, diff;
393 * Interrupts were disabled prior to this call, so deal with counter
395 * NOTE! It's possible we lost a full dev->max_vblank_count events
396 * here if the register is small or we had vblank interrupts off for
399 cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
400 diff = cur_vblank - dev->last_vblank[crtc];
401 if (cur_vblank < dev->last_vblank[crtc]) {
402 diff += dev->max_vblank_count;
404 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
405 crtc, dev->last_vblank[crtc], cur_vblank, diff);
408 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
411 atomic_add(diff, &dev->_vblank_count[crtc]);
415 * drm_vblank_get - get a reference count on vblank events
417 * @crtc: which CRTC to own
419 * Acquire a reference count on vblank events to avoid having them disabled
423 * Zero on success, nonzero on failure.
425 int drm_vblank_get(struct drm_device *dev, int crtc)
427 unsigned long irqflags;
430 spin_lock_irqsave(&dev->vbl_lock, irqflags);
431 /* Going from 0->1 means we have to enable interrupts again */
432 if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) {
433 if (!dev->vblank_enabled[crtc]) {
434 ret = dev->driver->enable_vblank(dev, crtc);
435 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret);
437 atomic_dec(&dev->vblank_refcount[crtc]);
439 dev->vblank_enabled[crtc] = 1;
440 drm_update_vblank_count(dev, crtc);
444 if (!dev->vblank_enabled[crtc]) {
445 atomic_dec(&dev->vblank_refcount[crtc]);
449 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
453 EXPORT_SYMBOL(drm_vblank_get);
456 * drm_vblank_put - give up ownership of vblank events
458 * @crtc: which counter to give up
460 * Release ownership of a given vblank counter, turning off interrupts
463 void drm_vblank_put(struct drm_device *dev, int crtc)
465 BUG_ON (atomic_read (&dev->vblank_refcount[crtc]) == 0);
467 /* Last user schedules interrupt disable */
468 if (atomic_dec_and_test(&dev->vblank_refcount[crtc]))
469 mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ);
471 EXPORT_SYMBOL(drm_vblank_put);
473 void drm_vblank_off(struct drm_device *dev, int crtc)
475 unsigned long irqflags;
477 spin_lock_irqsave(&dev->vbl_lock, irqflags);
478 DRM_WAKEUP(&dev->vbl_queue[crtc]);
479 dev->vblank_enabled[crtc] = 0;
480 dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc);
481 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
483 EXPORT_SYMBOL(drm_vblank_off);
486 * drm_vblank_pre_modeset - account for vblanks across mode sets
488 * @crtc: CRTC in question
489 * @post: post or pre mode set?
491 * Account for vblank events across mode setting events, which will likely
492 * reset the hardware frame counter.
494 void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
497 * To avoid all the problems that might happen if interrupts
498 * were enabled/disabled around or between these calls, we just
499 * have the kernel take a reference on the CRTC (just once though
500 * to avoid corrupting the count if multiple, mismatch calls occur),
501 * so that interrupts remain enabled in the interim.
503 if (!dev->vblank_inmodeset[crtc]) {
504 dev->vblank_inmodeset[crtc] = 0x1;
505 if (drm_vblank_get(dev, crtc) == 0)
506 dev->vblank_inmodeset[crtc] |= 0x2;
509 EXPORT_SYMBOL(drm_vblank_pre_modeset);
511 void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
513 unsigned long irqflags;
515 if (dev->vblank_inmodeset[crtc]) {
516 spin_lock_irqsave(&dev->vbl_lock, irqflags);
517 dev->vblank_disable_allowed = 1;
518 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
520 if (dev->vblank_inmodeset[crtc] & 0x2)
521 drm_vblank_put(dev, crtc);
523 dev->vblank_inmodeset[crtc] = 0;
526 EXPORT_SYMBOL(drm_vblank_post_modeset);
529 * drm_modeset_ctl - handle vblank event counter changes across mode switch
530 * @DRM_IOCTL_ARGS: standard ioctl arguments
532 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
533 * ioctls around modesetting so that any lost vblank events are accounted for.
535 * Generally the counter will reset across mode sets. If interrupts are
536 * enabled around this call, we don't have to do anything since the counter
537 * will have already been incremented.
539 int drm_modeset_ctl(struct drm_device *dev, void *data,
540 struct drm_file *file_priv)
542 struct drm_modeset_ctl *modeset = data;
546 /* If drm_vblank_init() hasn't been called yet, just no-op */
550 crtc = modeset->crtc;
551 if (crtc >= dev->num_crtcs) {
556 switch (modeset->cmd) {
557 case _DRM_PRE_MODESET:
558 drm_vblank_pre_modeset(dev, crtc);
560 case _DRM_POST_MODESET:
561 drm_vblank_post_modeset(dev, crtc);
575 * \param inode device inode.
576 * \param file_priv DRM file private.
577 * \param cmd command.
578 * \param data user argument, pointing to a drm_wait_vblank structure.
579 * \return zero on success or a negative number on failure.
581 * This function enables the vblank interrupt on the pipe requested, then
582 * sleeps waiting for the requested sequence number to occur, and drops
583 * the vblank interrupt refcount afterwards. (vblank irq disable follows that
584 * after a timeout with no further vblank waits scheduled).
586 int drm_wait_vblank(struct drm_device *dev, void *data,
587 struct drm_file *file_priv)
589 union drm_wait_vblank *vblwait = data;
591 unsigned int flags, seq, crtc;
593 if ((!dev->pdev->irq) || (!dev->irq_enabled))
596 if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
599 if (vblwait->request.type &
600 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
601 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
602 vblwait->request.type,
603 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
607 flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
608 crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
610 if (crtc >= dev->num_crtcs)
613 ret = drm_vblank_get(dev, crtc);
615 DRM_DEBUG("failed to acquire vblank counter, %d\n", ret);
618 seq = drm_vblank_count(dev, crtc);
620 switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
621 case _DRM_VBLANK_RELATIVE:
622 vblwait->request.sequence += seq;
623 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
624 case _DRM_VBLANK_ABSOLUTE:
631 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
632 (seq - vblwait->request.sequence) <= (1<<23)) {
633 vblwait->request.sequence = seq + 1;
636 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
637 vblwait->request.sequence, crtc);
638 dev->last_vblank_wait[crtc] = vblwait->request.sequence;
639 DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
640 (((drm_vblank_count(dev, crtc) -
641 vblwait->request.sequence) <= (1 << 23)) ||
647 do_gettimeofday(&now);
649 vblwait->reply.tval_sec = now.tv_sec;
650 vblwait->reply.tval_usec = now.tv_usec;
651 vblwait->reply.sequence = drm_vblank_count(dev, crtc);
652 DRM_DEBUG("returning %d to client\n",
653 vblwait->reply.sequence);
655 DRM_DEBUG("vblank wait interrupted by signal\n");
659 drm_vblank_put(dev, crtc);
664 * drm_handle_vblank - handle a vblank event
666 * @crtc: where this event occurred
668 * Drivers should call this routine in their vblank interrupt handlers to
669 * update the vblank counter and send any signals that may be pending.
671 void drm_handle_vblank(struct drm_device *dev, int crtc)
673 atomic_inc(&dev->_vblank_count[crtc]);
674 DRM_WAKEUP(&dev->vbl_queue[crtc]);
676 EXPORT_SYMBOL(drm_handle_vblank);