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 filp file pointer.
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 file *filp,
54 unsigned int cmd, unsigned long arg)
56 drm_file_t *priv = filp->private_data;
57 drm_device_t *dev = priv->head->dev;
58 drm_irq_busid_t __user *argp = (void __user *)arg;
61 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
64 if (copy_from_user(&p, argp, sizeof(p)))
67 if ((p.busnum >> 8) != drm_get_pci_domain(dev) ||
68 (p.busnum & 0xff) != dev->pdev->bus->number ||
69 p.devnum != PCI_SLOT(dev->pdev->devfn) || p.funcnum != PCI_FUNC(dev->pdev->devfn))
74 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p.busnum, p.devnum, p.funcnum, p.irq);
75 if (copy_to_user(argp, &p, sizeof(p)))
81 * Install IRQ handler.
83 * \param dev DRM device.
84 * \param irq IRQ number.
86 * Initializes the IRQ related data, and setups drm_device::vbl_queue. Installs the handler, calling the driver
87 * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
88 * before and after the installation.
90 static int drm_irq_install(drm_device_t * dev)
93 unsigned long sh_flags = 0;
95 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
101 mutex_lock(&dev->struct_mutex);
103 /* Driver must have been initialized */
104 if (!dev->dev_private) {
105 mutex_unlock(&dev->struct_mutex);
109 if (dev->irq_enabled) {
110 mutex_unlock(&dev->struct_mutex);
113 dev->irq_enabled = 1;
114 mutex_unlock(&dev->struct_mutex);
116 DRM_DEBUG("%s: irq=%d\n", __FUNCTION__, dev->irq);
118 if (drm_core_check_feature(dev, DRIVER_IRQ_VBL)) {
119 init_waitqueue_head(&dev->vbl_queue);
121 spin_lock_init(&dev->vbl_lock);
122 spin_lock_init(&dev->tasklet_lock);
124 INIT_LIST_HEAD(&dev->vbl_sigs.head);
125 INIT_LIST_HEAD(&dev->vbl_sigs2.head);
127 dev->vbl_pending = 0;
130 /* Before installing handler */
131 dev->driver->irq_preinstall(dev);
133 /* Install handler */
134 if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
135 sh_flags = IRQF_SHARED;
137 ret = request_irq(dev->irq, dev->driver->irq_handler,
138 sh_flags, dev->devname, dev);
140 mutex_lock(&dev->struct_mutex);
141 dev->irq_enabled = 0;
142 mutex_unlock(&dev->struct_mutex);
146 /* After installing handler */
147 dev->driver->irq_postinstall(dev);
153 * Uninstall the IRQ handler.
155 * \param dev DRM device.
157 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
159 int drm_irq_uninstall(drm_device_t * dev)
163 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
166 mutex_lock(&dev->struct_mutex);
167 irq_enabled = dev->irq_enabled;
168 dev->irq_enabled = 0;
169 mutex_unlock(&dev->struct_mutex);
174 DRM_DEBUG("%s: irq=%d\n", __FUNCTION__, dev->irq);
176 dev->driver->irq_uninstall(dev);
178 free_irq(dev->irq, dev);
180 dev->locked_tasklet_func = NULL;
185 EXPORT_SYMBOL(drm_irq_uninstall);
190 * \param inode device inode.
191 * \param filp file pointer.
192 * \param cmd command.
193 * \param arg user argument, pointing to a drm_control structure.
194 * \return zero on success or a negative number on failure.
196 * Calls irq_install() or irq_uninstall() according to \p arg.
198 int drm_control(struct inode *inode, struct file *filp,
199 unsigned int cmd, unsigned long arg)
201 drm_file_t *priv = filp->private_data;
202 drm_device_t *dev = priv->head->dev;
205 /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
207 if (copy_from_user(&ctl, (drm_control_t __user *) arg, sizeof(ctl)))
211 case DRM_INST_HANDLER:
212 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
214 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
217 return drm_irq_install(dev);
218 case DRM_UNINST_HANDLER:
219 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
221 return drm_irq_uninstall(dev);
230 * \param inode device inode.
231 * \param filp file pointer.
232 * \param cmd command.
233 * \param data user argument, pointing to a drm_wait_vblank structure.
234 * \return zero on success or a negative number on failure.
236 * Verifies the IRQ is installed.
238 * If a signal is requested checks if this task has already scheduled the same signal
239 * for the same vblank sequence number - nothing to be done in
240 * that case. If the number of tasks waiting for the interrupt exceeds 100 the
241 * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
244 * If a signal is not requested, then calls vblank_wait().
246 int drm_wait_vblank(DRM_IOCTL_ARGS)
248 drm_file_t *priv = filp->private_data;
249 drm_device_t *dev = priv->head->dev;
250 drm_wait_vblank_t __user *argp = (void __user *)data;
251 drm_wait_vblank_t vblwait;
260 if (copy_from_user(&vblwait, argp, sizeof(vblwait)))
263 if (vblwait.request.type &
264 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
265 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
266 vblwait.request.type,
267 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
271 flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;
273 if (!drm_core_check_feature(dev, (flags & _DRM_VBLANK_SECONDARY) ?
274 DRIVER_IRQ_VBL2 : DRIVER_IRQ_VBL))
277 seq = (flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_received2 :
280 switch (vblwait.request.type & _DRM_VBLANK_TYPES_MASK) {
281 case _DRM_VBLANK_RELATIVE:
282 vblwait.request.sequence += atomic_read(seq);
283 vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
284 case _DRM_VBLANK_ABSOLUTE:
290 if (flags & _DRM_VBLANK_SIGNAL) {
291 unsigned long irqflags;
292 drm_vbl_sig_t *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY)
293 ? &dev->vbl_sigs2 : &dev->vbl_sigs;
294 drm_vbl_sig_t *vbl_sig;
296 vblwait.reply.sequence = atomic_read(seq);
298 spin_lock_irqsave(&dev->vbl_lock, irqflags);
300 /* Check if this task has already scheduled the same signal
301 * for the same vblank sequence number; nothing to be done in
304 list_for_each_entry(vbl_sig, &vbl_sigs->head, head) {
305 if (vbl_sig->sequence == vblwait.request.sequence
306 && vbl_sig->info.si_signo == vblwait.request.signal
307 && vbl_sig->task == current) {
308 spin_unlock_irqrestore(&dev->vbl_lock,
314 if (dev->vbl_pending >= 100) {
315 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
321 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
325 drm_alloc(sizeof(drm_vbl_sig_t), DRM_MEM_DRIVER))) {
329 memset((void *)vbl_sig, 0, sizeof(*vbl_sig));
331 vbl_sig->sequence = vblwait.request.sequence;
332 vbl_sig->info.si_signo = vblwait.request.signal;
333 vbl_sig->task = current;
335 spin_lock_irqsave(&dev->vbl_lock, irqflags);
337 list_add_tail((struct list_head *)vbl_sig, &vbl_sigs->head);
339 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
341 if (flags & _DRM_VBLANK_SECONDARY) {
342 if (dev->driver->vblank_wait2)
343 ret = dev->driver->vblank_wait2(dev, &vblwait.request.sequence);
344 } else if (dev->driver->vblank_wait)
346 dev->driver->vblank_wait(dev,
347 &vblwait.request.sequence);
349 do_gettimeofday(&now);
350 vblwait.reply.tval_sec = now.tv_sec;
351 vblwait.reply.tval_usec = now.tv_usec;
355 if (copy_to_user(argp, &vblwait, sizeof(vblwait)))
362 * Send the VBLANK signals.
364 * \param dev DRM device.
366 * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
368 * If a signal is not requested, then calls vblank_wait().
370 void drm_vbl_send_signals(drm_device_t * dev)
375 spin_lock_irqsave(&dev->vbl_lock, flags);
377 for (i = 0; i < 2; i++) {
378 struct list_head *list, *tmp;
379 drm_vbl_sig_t *vbl_sig;
380 drm_vbl_sig_t *vbl_sigs = i ? &dev->vbl_sigs2 : &dev->vbl_sigs;
381 unsigned int vbl_seq = atomic_read(i ? &dev->vbl_received2 :
384 list_for_each_safe(list, tmp, &vbl_sigs->head) {
385 vbl_sig = list_entry(list, drm_vbl_sig_t, head);
386 if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) {
387 vbl_sig->info.si_code = vbl_seq;
388 send_sig_info(vbl_sig->info.si_signo,
389 &vbl_sig->info, vbl_sig->task);
393 drm_free(vbl_sig, sizeof(*vbl_sig),
401 spin_unlock_irqrestore(&dev->vbl_lock, flags);
404 EXPORT_SYMBOL(drm_vbl_send_signals);
407 * Tasklet wrapper function.
409 * \param data DRM device in disguise.
411 * Attempts to grab the HW lock and calls the driver callback on success. On
412 * failure, leave the lock marked as contended so the callback can be called
415 static void drm_locked_tasklet_func(unsigned long data)
417 drm_device_t *dev = (drm_device_t*)data;
418 unsigned long irqflags;
420 spin_lock_irqsave(&dev->tasklet_lock, irqflags);
422 if (!dev->locked_tasklet_func ||
423 !drm_lock_take(&dev->lock.hw_lock->lock,
424 DRM_KERNEL_CONTEXT)) {
425 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
429 dev->lock.lock_time = jiffies;
430 atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
432 dev->locked_tasklet_func(dev);
434 drm_lock_free(dev, &dev->lock.hw_lock->lock,
437 dev->locked_tasklet_func = NULL;
439 spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
443 * Schedule a tasklet to call back a driver hook with the HW lock held.
445 * \param dev DRM device.
446 * \param func Driver callback.
448 * This is intended for triggering actions that require the HW lock from an
449 * interrupt handler. The lock will be grabbed ASAP after the interrupt handler
450 * completes. Note that the callback may be called from interrupt or process
451 * context, it must not make any assumptions about this. Also, the HW lock will
452 * be held with the kernel context or any client context.
454 void drm_locked_tasklet(drm_device_t *dev, void (*func)(drm_device_t*))
456 unsigned long irqflags;
457 static DECLARE_TASKLET(drm_tasklet, drm_locked_tasklet_func, 0);
459 if (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);