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);
123 INIT_LIST_HEAD(&dev->vbl_sigs.head);
124 INIT_LIST_HEAD(&dev->vbl_sigs2.head);
126 dev->vbl_pending = 0;
129 /* Before installing handler */
130 dev->driver->irq_preinstall(dev);
132 /* Install handler */
133 if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
134 sh_flags = IRQF_SHARED;
136 ret = request_irq(dev->irq, dev->driver->irq_handler,
137 sh_flags, dev->devname, dev);
139 mutex_lock(&dev->struct_mutex);
140 dev->irq_enabled = 0;
141 mutex_unlock(&dev->struct_mutex);
145 /* After installing handler */
146 dev->driver->irq_postinstall(dev);
152 * Uninstall the IRQ handler.
154 * \param dev DRM device.
156 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
158 int drm_irq_uninstall(drm_device_t * dev)
162 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
165 mutex_lock(&dev->struct_mutex);
166 irq_enabled = dev->irq_enabled;
167 dev->irq_enabled = 0;
168 mutex_unlock(&dev->struct_mutex);
173 DRM_DEBUG("%s: irq=%d\n", __FUNCTION__, dev->irq);
175 dev->driver->irq_uninstall(dev);
177 free_irq(dev->irq, dev);
182 EXPORT_SYMBOL(drm_irq_uninstall);
187 * \param inode device inode.
188 * \param filp file pointer.
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 inode *inode, struct file *filp,
196 unsigned int cmd, unsigned long arg)
198 drm_file_t *priv = filp->private_data;
199 drm_device_t *dev = priv->head->dev;
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, (drm_control_t __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 filp file pointer.
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 drm_file_t *priv = filp->private_data;
246 drm_device_t *dev = priv->head->dev;
247 drm_wait_vblank_t __user *argp = (void __user *)data;
248 drm_wait_vblank_t vblwait;
257 if (copy_from_user(&vblwait, argp, sizeof(vblwait)))
260 if (vblwait.request.type &
261 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
262 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
263 vblwait.request.type,
264 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
268 flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;
270 if (!drm_core_check_feature(dev, (flags & _DRM_VBLANK_SECONDARY) ?
271 DRIVER_IRQ_VBL2 : DRIVER_IRQ_VBL))
274 seq = (flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_received2 :
277 switch (vblwait.request.type & _DRM_VBLANK_TYPES_MASK) {
278 case _DRM_VBLANK_RELATIVE:
279 vblwait.request.sequence += atomic_read(seq);
280 vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
281 case _DRM_VBLANK_ABSOLUTE:
287 if (flags & _DRM_VBLANK_SIGNAL) {
288 unsigned long irqflags;
289 drm_vbl_sig_t *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY)
290 ? &dev->vbl_sigs2 : &dev->vbl_sigs;
291 drm_vbl_sig_t *vbl_sig;
293 vblwait.reply.sequence = atomic_read(seq);
295 spin_lock_irqsave(&dev->vbl_lock, irqflags);
297 /* Check if this task has already scheduled the same signal
298 * for the same vblank sequence number; nothing to be done in
301 list_for_each_entry(vbl_sig, &vbl_sigs->head, head) {
302 if (vbl_sig->sequence == vblwait.request.sequence
303 && vbl_sig->info.si_signo == vblwait.request.signal
304 && vbl_sig->task == current) {
305 spin_unlock_irqrestore(&dev->vbl_lock,
311 if (dev->vbl_pending >= 100) {
312 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
318 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
322 drm_alloc(sizeof(drm_vbl_sig_t), DRM_MEM_DRIVER))) {
326 memset((void *)vbl_sig, 0, sizeof(*vbl_sig));
328 vbl_sig->sequence = vblwait.request.sequence;
329 vbl_sig->info.si_signo = vblwait.request.signal;
330 vbl_sig->task = current;
332 spin_lock_irqsave(&dev->vbl_lock, irqflags);
334 list_add_tail((struct list_head *)vbl_sig, &vbl_sigs->head);
336 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
338 if (flags & _DRM_VBLANK_SECONDARY) {
339 if (dev->driver->vblank_wait2)
340 ret = dev->driver->vblank_wait2(dev, &vblwait.request.sequence);
341 } else if (dev->driver->vblank_wait)
343 dev->driver->vblank_wait(dev,
344 &vblwait.request.sequence);
346 do_gettimeofday(&now);
347 vblwait.reply.tval_sec = now.tv_sec;
348 vblwait.reply.tval_usec = now.tv_usec;
352 if (copy_to_user(argp, &vblwait, sizeof(vblwait)))
359 * Send the VBLANK signals.
361 * \param dev DRM device.
363 * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
365 * If a signal is not requested, then calls vblank_wait().
367 void drm_vbl_send_signals(drm_device_t * dev)
372 spin_lock_irqsave(&dev->vbl_lock, flags);
374 for (i = 0; i < 2; i++) {
375 struct list_head *list, *tmp;
376 drm_vbl_sig_t *vbl_sig;
377 drm_vbl_sig_t *vbl_sigs = i ? &dev->vbl_sigs2 : &dev->vbl_sigs;
378 unsigned int vbl_seq = atomic_read(i ? &dev->vbl_received2 :
381 list_for_each_safe(list, tmp, &vbl_sigs->head) {
382 vbl_sig = list_entry(list, drm_vbl_sig_t, head);
383 if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) {
384 vbl_sig->info.si_code = vbl_seq;
385 send_sig_info(vbl_sig->info.si_signo,
386 &vbl_sig->info, vbl_sig->task);
390 drm_free(vbl_sig, sizeof(*vbl_sig),
398 spin_unlock_irqrestore(&dev->vbl_lock, flags);
401 EXPORT_SYMBOL(drm_vbl_send_signals);