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) != dev
->pci_domain
||
68 (p
.busnum
& 0xff) != dev
->pci_bus
||
69 p
.devnum
!= dev
->pci_slot
|| p
.funcnum
!= dev
->pci_func
)
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
);
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
))
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(drm_device_t
* 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
);
181 EXPORT_SYMBOL(drm_irq_uninstall
);
186 * \param inode device inode.
187 * \param filp file pointer.
188 * \param cmd command.
189 * \param arg user argument, pointing to a drm_control structure.
190 * \return zero on success or a negative number on failure.
192 * Calls irq_install() or irq_uninstall() according to \p arg.
194 int drm_control(struct inode
*inode
, struct file
*filp
,
195 unsigned int cmd
, unsigned long arg
)
197 drm_file_t
*priv
= filp
->private_data
;
198 drm_device_t
*dev
= priv
->head
->dev
;
201 /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
203 if (copy_from_user(&ctl
, (drm_control_t __user
*) arg
, sizeof(ctl
)))
207 case DRM_INST_HANDLER
:
208 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
210 if (dev
->if_version
< DRM_IF_VERSION(1, 2) &&
213 return drm_irq_install(dev
);
214 case DRM_UNINST_HANDLER
:
215 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
217 return drm_irq_uninstall(dev
);
226 * \param inode device inode.
227 * \param filp file pointer.
228 * \param cmd command.
229 * \param data user argument, pointing to a drm_wait_vblank structure.
230 * \return zero on success or a negative number on failure.
232 * Verifies the IRQ is installed.
234 * If a signal is requested checks if this task has already scheduled the same signal
235 * for the same vblank sequence number - nothing to be done in
236 * that case. If the number of tasks waiting for the interrupt exceeds 100 the
237 * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
240 * If a signal is not requested, then calls vblank_wait().
242 int drm_wait_vblank(DRM_IOCTL_ARGS
)
244 drm_file_t
*priv
= filp
->private_data
;
245 drm_device_t
*dev
= priv
->head
->dev
;
246 drm_wait_vblank_t __user
*argp
= (void __user
*)data
;
247 drm_wait_vblank_t vblwait
;
252 if (!drm_core_check_feature(dev
, DRIVER_IRQ_VBL
))
258 DRM_COPY_FROM_USER_IOCTL(vblwait
, argp
, sizeof(vblwait
));
260 switch (vblwait
.request
.type
& ~_DRM_VBLANK_FLAGS_MASK
) {
261 case _DRM_VBLANK_RELATIVE
:
262 vblwait
.request
.sequence
+= atomic_read(&dev
->vbl_received
);
263 vblwait
.request
.type
&= ~_DRM_VBLANK_RELATIVE
;
264 case _DRM_VBLANK_ABSOLUTE
:
270 flags
= vblwait
.request
.type
& _DRM_VBLANK_FLAGS_MASK
;
272 if (flags
& _DRM_VBLANK_SIGNAL
) {
273 unsigned long irqflags
;
274 drm_vbl_sig_t
*vbl_sig
;
276 vblwait
.reply
.sequence
= atomic_read(&dev
->vbl_received
);
278 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
280 /* Check if this task has already scheduled the same signal
281 * for the same vblank sequence number; nothing to be done in
284 list_for_each_entry(vbl_sig
, &dev
->vbl_sigs
.head
, head
) {
285 if (vbl_sig
->sequence
== vblwait
.request
.sequence
286 && vbl_sig
->info
.si_signo
== vblwait
.request
.signal
287 && vbl_sig
->task
== current
) {
288 spin_unlock_irqrestore(&dev
->vbl_lock
,
294 if (dev
->vbl_pending
>= 100) {
295 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
301 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
305 drm_alloc(sizeof(drm_vbl_sig_t
), DRM_MEM_DRIVER
))) {
309 memset((void *)vbl_sig
, 0, sizeof(*vbl_sig
));
311 vbl_sig
->sequence
= vblwait
.request
.sequence
;
312 vbl_sig
->info
.si_signo
= vblwait
.request
.signal
;
313 vbl_sig
->task
= current
;
315 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
317 list_add_tail((struct list_head
*)vbl_sig
, &dev
->vbl_sigs
.head
);
319 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
321 if (dev
->driver
->vblank_wait
)
323 dev
->driver
->vblank_wait(dev
,
324 &vblwait
.request
.sequence
);
326 do_gettimeofday(&now
);
327 vblwait
.reply
.tval_sec
= now
.tv_sec
;
328 vblwait
.reply
.tval_usec
= now
.tv_usec
;
332 DRM_COPY_TO_USER_IOCTL(argp
, vblwait
, sizeof(vblwait
));
338 * Send the VBLANK signals.
340 * \param dev DRM device.
342 * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
344 * If a signal is not requested, then calls vblank_wait().
346 void drm_vbl_send_signals(drm_device_t
* dev
)
348 struct list_head
*list
, *tmp
;
349 drm_vbl_sig_t
*vbl_sig
;
350 unsigned int vbl_seq
= atomic_read(&dev
->vbl_received
);
353 spin_lock_irqsave(&dev
->vbl_lock
, flags
);
355 list_for_each_safe(list
, tmp
, &dev
->vbl_sigs
.head
) {
356 vbl_sig
= list_entry(list
, drm_vbl_sig_t
, head
);
357 if ((vbl_seq
- vbl_sig
->sequence
) <= (1 << 23)) {
358 vbl_sig
->info
.si_code
= vbl_seq
;
359 send_sig_info(vbl_sig
->info
.si_signo
, &vbl_sig
->info
,
364 drm_free(vbl_sig
, sizeof(*vbl_sig
), DRM_MEM_DRIVER
);
370 spin_unlock_irqrestore(&dev
->vbl_lock
, flags
);
373 EXPORT_SYMBOL(drm_vbl_send_signals
);