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,
75 * Install IRQ handler.
77 * \param dev DRM device.
78 * \param irq IRQ number.
80 * Initializes the IRQ related data, and setups drm_device::vbl_queue. Installs the handler, calling the driver
81 * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
82 * before and after the installation.
84 static int drm_irq_install(struct drm_device * dev)
87 unsigned long sh_flags = 0;
89 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
92 if (dev->pdev->irq == 0)
95 mutex_lock(&dev->struct_mutex);
97 /* Driver must have been initialized */
98 if (!dev->dev_private) {
99 mutex_unlock(&dev->struct_mutex);
103 if (dev->irq_enabled) {
104 mutex_unlock(&dev->struct_mutex);
107 dev->irq_enabled = 1;
108 mutex_unlock(&dev->struct_mutex);
110 DRM_DEBUG("irq=%d\n", dev->pdev->irq);
112 if (drm_core_check_feature(dev, DRIVER_IRQ_VBL)) {
113 init_waitqueue_head(&dev->vbl_queue);
115 spin_lock_init(&dev->vbl_lock);
117 INIT_LIST_HEAD(&dev->vbl_sigs);
118 INIT_LIST_HEAD(&dev->vbl_sigs2);
120 dev->vbl_pending = 0;
123 /* Before installing handler */
124 dev->driver->irq_preinstall(dev);
126 /* Install handler */
127 if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
128 sh_flags = IRQF_SHARED;
130 ret = request_irq(dev->pdev->irq, dev->driver->irq_handler,
131 sh_flags, dev->devname, dev);
132 /* Expose the device irq number to drivers that want to export it for
135 dev->irq = dev->pdev->irq;
137 mutex_lock(&dev->struct_mutex);
138 dev->irq_enabled = 0;
139 mutex_unlock(&dev->struct_mutex);
143 /* After installing handler */
144 dev->driver->irq_postinstall(dev);
150 * Uninstall the IRQ handler.
152 * \param dev DRM device.
154 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
156 int drm_irq_uninstall(struct drm_device * dev)
160 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
163 mutex_lock(&dev->struct_mutex);
164 irq_enabled = dev->irq_enabled;
165 dev->irq_enabled = 0;
166 mutex_unlock(&dev->struct_mutex);
171 DRM_DEBUG("irq=%d\n", dev->pdev->irq);
173 dev->driver->irq_uninstall(dev);
175 free_irq(dev->pdev->irq, dev);
177 dev->locked_tasklet_func = NULL;
182 EXPORT_SYMBOL(drm_irq_uninstall);
187 * \param inode device inode.
188 * \param file_priv DRM file private.
189 * \param cmd command.
190 * \param arg user argument, pointing to a drm_control structure.
191 * \return zero on success or a negative number on failure.
193 * Calls irq_install() or irq_uninstall() according to \p arg.
195 int drm_control(struct drm_device *dev, void *data,
196 struct drm_file *file_priv)
198 struct drm_control *ctl = data;
200 /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
204 case DRM_INST_HANDLER:
205 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
207 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
208 ctl->irq != dev->pdev->irq)
210 return drm_irq_install(dev);
211 case DRM_UNINST_HANDLER:
212 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
214 return drm_irq_uninstall(dev);
223 * \param inode device inode.
224 * \param file_priv DRM file private.
225 * \param cmd command.
226 * \param data user argument, pointing to a drm_wait_vblank structure.
227 * \return zero on success or a negative number on failure.
229 * Verifies the IRQ is installed.
231 * If a signal is requested checks if this task has already scheduled the same signal
232 * for the same vblank sequence number - nothing to be done in
233 * that case. If the number of tasks waiting for the interrupt exceeds 100 the
234 * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
237 * If a signal is not requested, then calls vblank_wait().
239 int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_priv)
241 union drm_wait_vblank *vblwait = data;
244 unsigned int flags, seq;
246 if ((!dev->pdev->irq) || (!dev->irq_enabled))
249 if (vblwait->request.type &
250 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
251 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
252 vblwait->request.type,
253 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
257 flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
259 if (!drm_core_check_feature(dev, (flags & _DRM_VBLANK_SECONDARY) ?
260 DRIVER_IRQ_VBL2 : DRIVER_IRQ_VBL))
263 seq = atomic_read((flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_received2
264 : &dev->vbl_received);
266 switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
267 case _DRM_VBLANK_RELATIVE:
268 vblwait->request.sequence += seq;
269 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
270 case _DRM_VBLANK_ABSOLUTE:
276 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
277 (seq - vblwait->request.sequence) <= (1<<23)) {
278 vblwait->request.sequence = seq + 1;
281 if (flags & _DRM_VBLANK_SIGNAL) {
282 unsigned long irqflags;
283 struct list_head *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY)
284 ? &dev->vbl_sigs2 : &dev->vbl_sigs;
285 struct drm_vbl_sig *vbl_sig;
287 spin_lock_irqsave(&dev->vbl_lock, irqflags);
289 /* Check if this task has already scheduled the same signal
290 * for the same vblank sequence number; nothing to be done in
293 list_for_each_entry(vbl_sig, vbl_sigs, head) {
294 if (vbl_sig->sequence == vblwait->request.sequence
295 && vbl_sig->info.si_signo ==
296 vblwait->request.signal
297 && vbl_sig->task == current) {
298 spin_unlock_irqrestore(&dev->vbl_lock,
300 vblwait->reply.sequence = seq;
305 if (dev->vbl_pending >= 100) {
306 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
312 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
316 drm_alloc(sizeof(struct drm_vbl_sig), DRM_MEM_DRIVER))) {
320 memset((void *)vbl_sig, 0, sizeof(*vbl_sig));
322 vbl_sig->sequence = vblwait->request.sequence;
323 vbl_sig->info.si_signo = vblwait->request.signal;
324 vbl_sig->task = current;
326 spin_lock_irqsave(&dev->vbl_lock, irqflags);
328 list_add_tail(&vbl_sig->head, vbl_sigs);
330 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
332 vblwait->reply.sequence = seq;
334 if (flags & _DRM_VBLANK_SECONDARY) {
335 if (dev->driver->vblank_wait2)
336 ret = dev->driver->vblank_wait2(dev, &vblwait->request.sequence);
337 } else if (dev->driver->vblank_wait)
339 dev->driver->vblank_wait(dev,
340 &vblwait->request.sequence);
342 do_gettimeofday(&now);
343 vblwait->reply.tval_sec = now.tv_sec;
344 vblwait->reply.tval_usec = now.tv_usec;
352 * Send the VBLANK signals.
354 * \param dev DRM device.
356 * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
358 * If a signal is not requested, then calls vblank_wait().
360 void drm_vbl_send_signals(struct drm_device * dev)
365 spin_lock_irqsave(&dev->vbl_lock, flags);
367 for (i = 0; i < 2; i++) {
368 struct drm_vbl_sig *vbl_sig, *tmp;
369 struct list_head *vbl_sigs = i ? &dev->vbl_sigs2 : &dev->vbl_sigs;
370 unsigned int vbl_seq = atomic_read(i ? &dev->vbl_received2 :
373 list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) {
374 if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) {
375 vbl_sig->info.si_code = vbl_seq;
376 send_sig_info(vbl_sig->info.si_signo,
377 &vbl_sig->info, vbl_sig->task);
379 list_del(&vbl_sig->head);
381 drm_free(vbl_sig, sizeof(*vbl_sig),
389 spin_unlock_irqrestore(&dev->vbl_lock, flags);
392 EXPORT_SYMBOL(drm_vbl_send_signals);
395 * Tasklet wrapper function.
397 * \param data DRM device in disguise.
399 * Attempts to grab the HW lock and calls the driver callback on success. On
400 * failure, leave the lock marked as contended so the callback can be called
403 static void drm_locked_tasklet_func(unsigned long data)
405 struct drm_device *dev = (struct drm_device *)data;
406 unsigned long irqflags;
407 void (*tasklet_func)(struct drm_device *);
409 spin_lock_irqsave(&dev->tasklet_lock, irqflags);
410 tasklet_func = dev->locked_tasklet_func;
411 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
414 !drm_lock_take(&dev->lock,
415 DRM_KERNEL_CONTEXT)) {
419 dev->lock.lock_time = jiffies;
420 atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
422 spin_lock_irqsave(&dev->tasklet_lock, irqflags);
423 tasklet_func = dev->locked_tasklet_func;
424 dev->locked_tasklet_func = NULL;
425 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
427 if (tasklet_func != NULL)
430 drm_lock_free(&dev->lock,
435 * Schedule a tasklet to call back a driver hook with the HW lock held.
437 * \param dev DRM device.
438 * \param func Driver callback.
440 * This is intended for triggering actions that require the HW lock from an
441 * interrupt handler. The lock will be grabbed ASAP after the interrupt handler
442 * completes. Note that the callback may be called from interrupt or process
443 * context, it must not make any assumptions about this. Also, the HW lock will
444 * be held with the kernel context or any client context.
446 void drm_locked_tasklet(struct drm_device *dev, void (*func)(struct drm_device *))
448 unsigned long irqflags;
449 static DECLARE_TASKLET(drm_tasklet, drm_locked_tasklet_func, 0);
451 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ) ||
452 test_bit(TASKLET_STATE_SCHED, &drm_tasklet.state))
455 spin_lock_irqsave(&dev->tasklet_lock, irqflags);
457 if (dev->locked_tasklet_func) {
458 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
462 dev->locked_tasklet_func = func;
464 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
466 drm_tasklet.data = (unsigned long)dev;
468 tasklet_hi_schedule(&drm_tasklet);
470 EXPORT_SYMBOL(drm_locked_tasklet);