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 inode *inode, struct drm_file *file_priv,
54 unsigned int cmd, unsigned long arg)
56 struct drm_device *dev = file_priv->head->dev;
57 struct drm_irq_busid __user *argp = (void __user *)arg;
58 struct drm_irq_busid p;
60 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
63 if (copy_from_user(&p, argp, sizeof(p)))
66 if ((p.busnum >> 8) != drm_get_pci_domain(dev) ||
67 (p.busnum & 0xff) != dev->pdev->bus->number ||
68 p.devnum != PCI_SLOT(dev->pdev->devfn) || p.funcnum != PCI_FUNC(dev->pdev->devfn))
73 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p.busnum, p.devnum, p.funcnum, p.irq);
74 if (copy_to_user(argp, &p, sizeof(p)))
80 * Install IRQ handler.
82 * \param dev DRM device.
83 * \param irq IRQ number.
85 * Initializes the IRQ related data, and setups drm_device::vbl_queue. Installs the handler, calling the driver
86 * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
87 * before and after the installation.
89 static int drm_irq_install(struct drm_device * dev)
92 unsigned long sh_flags = 0;
94 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
100 mutex_lock(&dev->struct_mutex);
102 /* Driver must have been initialized */
103 if (!dev->dev_private) {
104 mutex_unlock(&dev->struct_mutex);
108 if (dev->irq_enabled) {
109 mutex_unlock(&dev->struct_mutex);
112 dev->irq_enabled = 1;
113 mutex_unlock(&dev->struct_mutex);
115 DRM_DEBUG("%s: irq=%d\n", __FUNCTION__, dev->irq);
117 if (drm_core_check_feature(dev, DRIVER_IRQ_VBL)) {
118 init_waitqueue_head(&dev->vbl_queue);
120 spin_lock_init(&dev->vbl_lock);
122 INIT_LIST_HEAD(&dev->vbl_sigs);
123 INIT_LIST_HEAD(&dev->vbl_sigs2);
125 dev->vbl_pending = 0;
128 /* Before installing handler */
129 dev->driver->irq_preinstall(dev);
131 /* Install handler */
132 if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
133 sh_flags = IRQF_SHARED;
135 ret = request_irq(dev->irq, dev->driver->irq_handler,
136 sh_flags, dev->devname, dev);
138 mutex_lock(&dev->struct_mutex);
139 dev->irq_enabled = 0;
140 mutex_unlock(&dev->struct_mutex);
144 /* After installing handler */
145 dev->driver->irq_postinstall(dev);
151 * Uninstall the IRQ handler.
153 * \param dev DRM device.
155 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
157 int drm_irq_uninstall(struct drm_device * dev)
161 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
164 mutex_lock(&dev->struct_mutex);
165 irq_enabled = dev->irq_enabled;
166 dev->irq_enabled = 0;
167 mutex_unlock(&dev->struct_mutex);
172 DRM_DEBUG("%s: irq=%d\n", __FUNCTION__, dev->irq);
174 dev->driver->irq_uninstall(dev);
176 free_irq(dev->irq, dev);
178 dev->locked_tasklet_func = NULL;
183 EXPORT_SYMBOL(drm_irq_uninstall);
188 * \param inode device inode.
189 * \param file_priv DRM file private.
190 * \param cmd command.
191 * \param arg user argument, pointing to a drm_control structure.
192 * \return zero on success or a negative number on failure.
194 * Calls irq_install() or irq_uninstall() according to \p arg.
196 int drm_control(struct inode *inode, struct drm_file *file_priv,
197 unsigned int cmd, unsigned long arg)
199 struct drm_device *dev = file_priv->head->dev;
200 struct drm_control ctl;
202 /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
204 if (copy_from_user(&ctl, (struct drm_control __user *) arg, sizeof(ctl)))
208 case DRM_INST_HANDLER:
209 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
211 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
214 return drm_irq_install(dev);
215 case DRM_UNINST_HANDLER:
216 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
218 return drm_irq_uninstall(dev);
227 * \param inode device inode.
228 * \param file_priv DRM file private.
229 * \param cmd command.
230 * \param data user argument, pointing to a drm_wait_vblank structure.
231 * \return zero on success or a negative number on failure.
233 * Verifies the IRQ is installed.
235 * If a signal is requested checks if this task has already scheduled the same signal
236 * for the same vblank sequence number - nothing to be done in
237 * that case. If the number of tasks waiting for the interrupt exceeds 100 the
238 * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
241 * If a signal is not requested, then calls vblank_wait().
243 int drm_wait_vblank(DRM_IOCTL_ARGS)
245 struct drm_device *dev = file_priv->head->dev;
246 union drm_wait_vblank __user *argp = (void __user *)data;
247 union drm_wait_vblank vblwait;
250 unsigned int flags, seq;
255 if (copy_from_user(&vblwait, argp, sizeof(vblwait)))
258 if (vblwait.request.type &
259 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
260 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
261 vblwait.request.type,
262 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
266 flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;
268 if (!drm_core_check_feature(dev, (flags & _DRM_VBLANK_SECONDARY) ?
269 DRIVER_IRQ_VBL2 : DRIVER_IRQ_VBL))
272 seq = atomic_read((flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_received2
273 : &dev->vbl_received);
275 switch (vblwait.request.type & _DRM_VBLANK_TYPES_MASK) {
276 case _DRM_VBLANK_RELATIVE:
277 vblwait.request.sequence += seq;
278 vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
279 case _DRM_VBLANK_ABSOLUTE:
285 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
286 (seq - vblwait.request.sequence) <= (1<<23)) {
287 vblwait.request.sequence = seq + 1;
290 if (flags & _DRM_VBLANK_SIGNAL) {
291 unsigned long irqflags;
292 struct list_head *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY)
293 ? &dev->vbl_sigs2 : &dev->vbl_sigs;
294 struct drm_vbl_sig *vbl_sig;
296 spin_lock_irqsave(&dev->vbl_lock, irqflags);
298 /* Check if this task has already scheduled the same signal
299 * for the same vblank sequence number; nothing to be done in
302 list_for_each_entry(vbl_sig, vbl_sigs, head) {
303 if (vbl_sig->sequence == vblwait.request.sequence
304 && vbl_sig->info.si_signo == vblwait.request.signal
305 && vbl_sig->task == current) {
306 spin_unlock_irqrestore(&dev->vbl_lock,
308 vblwait.reply.sequence = seq;
313 if (dev->vbl_pending >= 100) {
314 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
320 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
324 drm_alloc(sizeof(struct drm_vbl_sig), DRM_MEM_DRIVER))) {
328 memset((void *)vbl_sig, 0, sizeof(*vbl_sig));
330 vbl_sig->sequence = vblwait.request.sequence;
331 vbl_sig->info.si_signo = vblwait.request.signal;
332 vbl_sig->task = current;
334 spin_lock_irqsave(&dev->vbl_lock, irqflags);
336 list_add_tail(&vbl_sig->head, vbl_sigs);
338 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
340 vblwait.reply.sequence = seq;
342 if (flags & _DRM_VBLANK_SECONDARY) {
343 if (dev->driver->vblank_wait2)
344 ret = dev->driver->vblank_wait2(dev, &vblwait.request.sequence);
345 } else if (dev->driver->vblank_wait)
347 dev->driver->vblank_wait(dev,
348 &vblwait.request.sequence);
350 do_gettimeofday(&now);
351 vblwait.reply.tval_sec = now.tv_sec;
352 vblwait.reply.tval_usec = now.tv_usec;
356 if (copy_to_user(argp, &vblwait, sizeof(vblwait)))
363 * Send the VBLANK signals.
365 * \param dev DRM device.
367 * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
369 * If a signal is not requested, then calls vblank_wait().
371 void drm_vbl_send_signals(struct drm_device * dev)
376 spin_lock_irqsave(&dev->vbl_lock, flags);
378 for (i = 0; i < 2; i++) {
379 struct drm_vbl_sig *vbl_sig, *tmp;
380 struct list_head *vbl_sigs = i ? &dev->vbl_sigs2 : &dev->vbl_sigs;
381 unsigned int vbl_seq = atomic_read(i ? &dev->vbl_received2 :
384 list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) {
385 if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) {
386 vbl_sig->info.si_code = vbl_seq;
387 send_sig_info(vbl_sig->info.si_signo,
388 &vbl_sig->info, vbl_sig->task);
390 list_del(&vbl_sig->head);
392 drm_free(vbl_sig, sizeof(*vbl_sig),
400 spin_unlock_irqrestore(&dev->vbl_lock, flags);
403 EXPORT_SYMBOL(drm_vbl_send_signals);
406 * Tasklet wrapper function.
408 * \param data DRM device in disguise.
410 * Attempts to grab the HW lock and calls the driver callback on success. On
411 * failure, leave the lock marked as contended so the callback can be called
414 static void drm_locked_tasklet_func(unsigned long data)
416 struct drm_device *dev = (struct drm_device *)data;
417 unsigned long irqflags;
419 spin_lock_irqsave(&dev->tasklet_lock, irqflags);
421 if (!dev->locked_tasklet_func ||
422 !drm_lock_take(&dev->lock,
423 DRM_KERNEL_CONTEXT)) {
424 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
428 dev->lock.lock_time = jiffies;
429 atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
431 dev->locked_tasklet_func(dev);
433 drm_lock_free(&dev->lock,
436 dev->locked_tasklet_func = NULL;
438 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
442 * Schedule a tasklet to call back a driver hook with the HW lock held.
444 * \param dev DRM device.
445 * \param func Driver callback.
447 * This is intended for triggering actions that require the HW lock from an
448 * interrupt handler. The lock will be grabbed ASAP after the interrupt handler
449 * completes. Note that the callback may be called from interrupt or process
450 * context, it must not make any assumptions about this. Also, the HW lock will
451 * be held with the kernel context or any client context.
453 void drm_locked_tasklet(struct drm_device *dev, void (*func)(struct drm_device *))
455 unsigned long irqflags;
456 static DECLARE_TASKLET(drm_tasklet, drm_locked_tasklet_func, 0);
458 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ) ||
459 test_bit(TASKLET_STATE_SCHED, &drm_tasklet.state))
462 spin_lock_irqsave(&dev->tasklet_lock, irqflags);
464 if (dev->locked_tasklet_func) {
465 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
469 dev->locked_tasklet_func = func;
471 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
473 drm_tasklet.data = (unsigned long)dev;
475 tasklet_hi_schedule(&drm_tasklet);
477 EXPORT_SYMBOL(drm_locked_tasklet);