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->_vblank_count, sizeof(*dev->_vblank_count) *
110 dev->num_crtcs, DRM_MEM_DRIVER);
111 drm_free(dev->vblank_refcount, sizeof(*dev->vblank_refcount) *
112 dev->num_crtcs, DRM_MEM_DRIVER);
113 drm_free(dev->vblank_enabled, sizeof(*dev->vblank_enabled) *
114 dev->num_crtcs, DRM_MEM_DRIVER);
115 drm_free(dev->last_vblank, sizeof(*dev->last_vblank) * dev->num_crtcs,
117 drm_free(dev->last_vblank_wait,
118 sizeof(*dev->last_vblank_wait) * dev->num_crtcs,
120 drm_free(dev->vblank_inmodeset, sizeof(*dev->vblank_inmodeset) *
121 dev->num_crtcs, DRM_MEM_DRIVER);
126 int drm_vblank_init(struct drm_device *dev, int num_crtcs)
128 int i, ret = -ENOMEM;
130 setup_timer(&dev->vblank_disable_timer, vblank_disable_fn,
132 spin_lock_init(&dev->vbl_lock);
133 dev->num_crtcs = num_crtcs;
135 dev->vbl_queue = drm_alloc(sizeof(wait_queue_head_t) * num_crtcs,
140 dev->_vblank_count = drm_alloc(sizeof(atomic_t) * num_crtcs,
142 if (!dev->_vblank_count)
145 dev->vblank_refcount = drm_alloc(sizeof(atomic_t) * num_crtcs,
147 if (!dev->vblank_refcount)
150 dev->vblank_enabled = drm_calloc(num_crtcs, sizeof(int),
152 if (!dev->vblank_enabled)
155 dev->last_vblank = drm_calloc(num_crtcs, sizeof(u32), DRM_MEM_DRIVER);
156 if (!dev->last_vblank)
159 dev->last_vblank_wait = drm_calloc(num_crtcs, sizeof(u32),
161 if (!dev->last_vblank_wait)
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 atomic_set(&dev->_vblank_count[i], 0);
173 atomic_set(&dev->vblank_refcount[i], 0);
176 dev->vblank_disable_allowed = 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(drm_dev_to_irq(dev), dev->driver->irq_handler,
231 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)
261 unsigned long irqflags;
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);
273 * Wake up any waiters so they don't hang.
275 spin_lock_irqsave(&dev->vbl_lock, irqflags);
276 for (i = 0; i < dev->num_crtcs; i++) {
277 DRM_WAKEUP(&dev->vbl_queue[i]);
278 dev->vblank_enabled[i] = 0;
279 dev->last_vblank[i] = dev->driver->get_vblank_counter(dev, i);
281 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
286 DRM_DEBUG("irq=%d\n", dev->pdev->irq);
288 dev->driver->irq_uninstall(dev);
290 free_irq(dev->pdev->irq, dev);
294 EXPORT_SYMBOL(drm_irq_uninstall);
299 * \param inode device inode.
300 * \param file_priv DRM file private.
301 * \param cmd command.
302 * \param arg user argument, pointing to a drm_control structure.
303 * \return zero on success or a negative number on failure.
305 * Calls irq_install() or irq_uninstall() according to \p arg.
307 int drm_control(struct drm_device *dev, void *data,
308 struct drm_file *file_priv)
310 struct drm_control *ctl = data;
312 /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
316 case DRM_INST_HANDLER:
317 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
319 if (drm_core_check_feature(dev, DRIVER_MODESET))
321 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
322 ctl->irq != dev->pdev->irq)
324 return drm_irq_install(dev);
325 case DRM_UNINST_HANDLER:
326 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
328 if (drm_core_check_feature(dev, DRIVER_MODESET))
330 return drm_irq_uninstall(dev);
337 * drm_vblank_count - retrieve "cooked" vblank counter value
339 * @crtc: which counter to retrieve
341 * Fetches the "cooked" vblank count value that represents the number of
342 * vblank events since the system was booted, including lost events due to
343 * modesetting activity.
345 u32 drm_vblank_count(struct drm_device *dev, int crtc)
347 return atomic_read(&dev->_vblank_count[crtc]);
349 EXPORT_SYMBOL(drm_vblank_count);
352 * drm_update_vblank_count - update the master vblank counter
354 * @crtc: counter to update
356 * Call back into the driver to update the appropriate vblank counter
357 * (specified by @crtc). Deal with wraparound, if it occurred, and
358 * update the last read value so we can deal with wraparound on the next
361 * Only necessary when going from off->on, to account for frames we
362 * didn't get an interrupt for.
364 * Note: caller must hold dev->vbl_lock since this reads & writes
365 * device vblank fields.
367 static void drm_update_vblank_count(struct drm_device *dev, int crtc)
369 u32 cur_vblank, diff;
372 * Interrupts were disabled prior to this call, so deal with counter
374 * NOTE! It's possible we lost a full dev->max_vblank_count events
375 * here if the register is small or we had vblank interrupts off for
378 cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
379 diff = cur_vblank - dev->last_vblank[crtc];
380 if (cur_vblank < dev->last_vblank[crtc]) {
381 diff += dev->max_vblank_count;
383 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
384 crtc, dev->last_vblank[crtc], cur_vblank, diff);
387 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
390 atomic_add(diff, &dev->_vblank_count[crtc]);
394 * drm_vblank_get - get a reference count on vblank events
396 * @crtc: which CRTC to own
398 * Acquire a reference count on vblank events to avoid having them disabled
402 * Zero on success, nonzero on failure.
404 int drm_vblank_get(struct drm_device *dev, int crtc)
406 unsigned long irqflags;
409 spin_lock_irqsave(&dev->vbl_lock, irqflags);
410 /* Going from 0->1 means we have to enable interrupts again */
411 if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1 &&
412 !dev->vblank_enabled[crtc]) {
413 ret = dev->driver->enable_vblank(dev, crtc);
414 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret);
416 atomic_dec(&dev->vblank_refcount[crtc]);
418 dev->vblank_enabled[crtc] = 1;
419 drm_update_vblank_count(dev, crtc);
422 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
426 EXPORT_SYMBOL(drm_vblank_get);
429 * drm_vblank_put - give up ownership of vblank events
431 * @crtc: which counter to give up
433 * Release ownership of a given vblank counter, turning off interrupts
436 void drm_vblank_put(struct drm_device *dev, int crtc)
438 BUG_ON (atomic_read (&dev->vblank_refcount[crtc]) == 0);
440 /* Last user schedules interrupt disable */
441 if (atomic_dec_and_test(&dev->vblank_refcount[crtc]))
442 mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ);
444 EXPORT_SYMBOL(drm_vblank_put);
447 * drm_vblank_pre_modeset - account for vblanks across mode sets
449 * @crtc: CRTC in question
450 * @post: post or pre mode set?
452 * Account for vblank events across mode setting events, which will likely
453 * reset the hardware frame counter.
455 void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
458 * To avoid all the problems that might happen if interrupts
459 * were enabled/disabled around or between these calls, we just
460 * have the kernel take a reference on the CRTC (just once though
461 * to avoid corrupting the count if multiple, mismatch calls occur),
462 * so that interrupts remain enabled in the interim.
464 if (!dev->vblank_inmodeset[crtc]) {
465 dev->vblank_inmodeset[crtc] = 0x1;
466 if (drm_vblank_get(dev, crtc) == 0)
467 dev->vblank_inmodeset[crtc] |= 0x2;
470 EXPORT_SYMBOL(drm_vblank_pre_modeset);
472 void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
474 unsigned long irqflags;
476 if (dev->vblank_inmodeset[crtc]) {
477 spin_lock_irqsave(&dev->vbl_lock, irqflags);
478 dev->vblank_disable_allowed = 1;
479 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
481 if (dev->vblank_inmodeset[crtc] & 0x2)
482 drm_vblank_put(dev, crtc);
484 dev->vblank_inmodeset[crtc] = 0;
487 EXPORT_SYMBOL(drm_vblank_post_modeset);
490 * drm_modeset_ctl - handle vblank event counter changes across mode switch
491 * @DRM_IOCTL_ARGS: standard ioctl arguments
493 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
494 * ioctls around modesetting so that any lost vblank events are accounted for.
496 * Generally the counter will reset across mode sets. If interrupts are
497 * enabled around this call, we don't have to do anything since the counter
498 * will have already been incremented.
500 int drm_modeset_ctl(struct drm_device *dev, void *data,
501 struct drm_file *file_priv)
503 struct drm_modeset_ctl *modeset = data;
506 /* If drm_vblank_init() hasn't been called yet, just no-op */
510 crtc = modeset->crtc;
511 if (crtc >= dev->num_crtcs) {
516 switch (modeset->cmd) {
517 case _DRM_PRE_MODESET:
518 drm_vblank_pre_modeset(dev, crtc);
520 case _DRM_POST_MODESET:
521 drm_vblank_post_modeset(dev, crtc);
535 * \param inode device inode.
536 * \param file_priv DRM file private.
537 * \param cmd command.
538 * \param data user argument, pointing to a drm_wait_vblank structure.
539 * \return zero on success or a negative number on failure.
541 * This function enables the vblank interrupt on the pipe requested, then
542 * sleeps waiting for the requested sequence number to occur, and drops
543 * the vblank interrupt refcount afterwards. (vblank irq disable follows that
544 * after a timeout with no further vblank waits scheduled).
546 int drm_wait_vblank(struct drm_device *dev, void *data,
547 struct drm_file *file_priv)
549 union drm_wait_vblank *vblwait = data;
551 unsigned int flags, seq, crtc;
553 if ((!dev->pdev->irq) || (!dev->irq_enabled))
556 if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
559 if (vblwait->request.type &
560 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
561 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
562 vblwait->request.type,
563 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
567 flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
568 crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
570 if (crtc >= dev->num_crtcs)
573 ret = drm_vblank_get(dev, crtc);
575 DRM_ERROR("failed to acquire vblank counter, %d\n", ret);
578 seq = drm_vblank_count(dev, crtc);
580 switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
581 case _DRM_VBLANK_RELATIVE:
582 vblwait->request.sequence += seq;
583 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
584 case _DRM_VBLANK_ABSOLUTE:
591 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
592 (seq - vblwait->request.sequence) <= (1<<23)) {
593 vblwait->request.sequence = seq + 1;
596 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
597 vblwait->request.sequence, crtc);
598 dev->last_vblank_wait[crtc] = vblwait->request.sequence;
599 DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
600 (((drm_vblank_count(dev, crtc) -
601 vblwait->request.sequence) <= (1 << 23)) ||
607 do_gettimeofday(&now);
609 vblwait->reply.tval_sec = now.tv_sec;
610 vblwait->reply.tval_usec = now.tv_usec;
611 vblwait->reply.sequence = drm_vblank_count(dev, crtc);
612 DRM_DEBUG("returning %d to client\n",
613 vblwait->reply.sequence);
615 DRM_DEBUG("vblank wait interrupted by signal\n");
619 drm_vblank_put(dev, crtc);
624 * drm_handle_vblank - handle a vblank event
626 * @crtc: where this event occurred
628 * Drivers should call this routine in their vblank interrupt handlers to
629 * update the vblank counter and send any signals that may be pending.
631 void drm_handle_vblank(struct drm_device *dev, int crtc)
633 atomic_inc(&dev->_vblank_count[crtc]);
634 DRM_WAKEUP(&dev->vbl_queue[crtc]);
636 EXPORT_SYMBOL(drm_handle_vblank);