]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /** |
2 | * \file drm_irq.h | |
3 | * IRQ support | |
4 | * | |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
6 | * \author Gareth Hughes <gareth@valinux.com> | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com | |
11 | * | |
12 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
14 | * All Rights Reserved. | |
15 | * | |
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: | |
22 | * | |
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 | |
25 | * Software. | |
26 | * | |
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. | |
34 | */ | |
35 | ||
36 | #include "drmP.h" | |
37 | ||
38 | #include <linux/interrupt.h> /* For task queue support */ | |
39 | ||
40 | /** | |
41 | * Get interrupt from bus id. | |
42 | * | |
43 | * \param inode device inode. | |
44 | * \param filp file pointer. | |
45 | * \param cmd command. | |
46 | * \param arg user argument, pointing to a drm_irq_busid structure. | |
47 | * \return zero on success or a negative number on failure. | |
48 | * | |
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. | |
52 | */ | |
53 | int drm_irq_by_busid(struct inode *inode, struct file *filp, | |
54 | unsigned int cmd, unsigned long arg) | |
55 | { | |
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; | |
59 | drm_irq_busid_t p; | |
60 | ||
61 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
62 | return -EINVAL; | |
63 | ||
64 | if (copy_from_user(&p, argp, sizeof(p))) | |
65 | return -EFAULT; | |
66 | ||
67 | if ((p.busnum >> 8) != dev->pci_domain || | |
68 | (p.busnum & 0xff) != dev->pci_bus || | |
69 | p.devnum != dev->pci_slot || | |
70 | p.funcnum != dev->pci_func) | |
71 | return -EINVAL; | |
72 | ||
73 | p.irq = dev->irq; | |
74 | ||
75 | DRM_DEBUG("%d:%d:%d => IRQ %d\n", | |
76 | p.busnum, p.devnum, p.funcnum, p.irq); | |
77 | if (copy_to_user(argp, &p, sizeof(p))) | |
78 | return -EFAULT; | |
79 | return 0; | |
80 | } | |
81 | ||
82 | /** | |
83 | * Install IRQ handler. | |
84 | * | |
85 | * \param dev DRM device. | |
86 | * \param irq IRQ number. | |
87 | * | |
88 | * Initializes the IRQ related data, and setups drm_device::vbl_queue. Installs the handler, calling the driver | |
89 | * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions | |
90 | * before and after the installation. | |
91 | */ | |
c94f7029 | 92 | static int drm_irq_install( drm_device_t *dev ) |
1da177e4 LT |
93 | { |
94 | int ret; | |
95 | unsigned long sh_flags=0; | |
96 | ||
97 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
98 | return -EINVAL; | |
99 | ||
100 | if ( dev->irq == 0 ) | |
101 | return -EINVAL; | |
102 | ||
103 | down( &dev->struct_sem ); | |
104 | ||
105 | /* Driver must have been initialized */ | |
106 | if ( !dev->dev_private ) { | |
107 | up( &dev->struct_sem ); | |
108 | return -EINVAL; | |
109 | } | |
110 | ||
111 | if ( dev->irq_enabled ) { | |
112 | up( &dev->struct_sem ); | |
113 | return -EBUSY; | |
114 | } | |
115 | dev->irq_enabled = 1; | |
116 | up( &dev->struct_sem ); | |
117 | ||
118 | DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, dev->irq ); | |
119 | ||
120 | if (drm_core_check_feature(dev, DRIVER_IRQ_VBL)) { | |
121 | init_waitqueue_head(&dev->vbl_queue); | |
122 | ||
123 | spin_lock_init( &dev->vbl_lock ); | |
124 | ||
125 | INIT_LIST_HEAD( &dev->vbl_sigs.head ); | |
126 | ||
127 | dev->vbl_pending = 0; | |
128 | } | |
129 | ||
130 | /* Before installing handler */ | |
131 | dev->driver->irq_preinstall(dev); | |
132 | ||
133 | /* Install handler */ | |
134 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) | |
135 | sh_flags = SA_SHIRQ; | |
136 | ||
137 | ret = request_irq( dev->irq, dev->driver->irq_handler, | |
138 | sh_flags, dev->devname, dev ); | |
139 | if ( ret < 0 ) { | |
140 | down( &dev->struct_sem ); | |
141 | dev->irq_enabled = 0; | |
142 | up( &dev->struct_sem ); | |
143 | return ret; | |
144 | } | |
145 | ||
146 | /* After installing handler */ | |
147 | dev->driver->irq_postinstall(dev); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | /** | |
153 | * Uninstall the IRQ handler. | |
154 | * | |
155 | * \param dev DRM device. | |
156 | * | |
157 | * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq. | |
158 | */ | |
159 | int drm_irq_uninstall( drm_device_t *dev ) | |
160 | { | |
161 | int irq_enabled; | |
162 | ||
163 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
164 | return -EINVAL; | |
165 | ||
166 | down( &dev->struct_sem ); | |
167 | irq_enabled = dev->irq_enabled; | |
168 | dev->irq_enabled = 0; | |
169 | up( &dev->struct_sem ); | |
170 | ||
171 | if ( !irq_enabled ) | |
172 | return -EINVAL; | |
173 | ||
174 | DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, dev->irq ); | |
175 | ||
176 | dev->driver->irq_uninstall(dev); | |
177 | ||
178 | free_irq( dev->irq, dev ); | |
179 | ||
180 | return 0; | |
181 | } | |
182 | EXPORT_SYMBOL(drm_irq_uninstall); | |
183 | ||
184 | /** | |
185 | * IRQ control ioctl. | |
186 | * | |
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. | |
192 | * | |
193 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
194 | */ | |
195 | int drm_control( struct inode *inode, struct file *filp, | |
196 | unsigned int cmd, unsigned long arg ) | |
197 | { | |
198 | drm_file_t *priv = filp->private_data; | |
199 | drm_device_t *dev = priv->head->dev; | |
200 | drm_control_t ctl; | |
201 | ||
202 | /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */ | |
203 | ||
204 | if ( copy_from_user( &ctl, (drm_control_t __user *)arg, sizeof(ctl) ) ) | |
205 | return -EFAULT; | |
206 | ||
207 | switch ( ctl.func ) { | |
208 | case DRM_INST_HANDLER: | |
209 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
210 | return 0; | |
211 | if (dev->if_version < DRM_IF_VERSION(1, 2) && | |
212 | ctl.irq != dev->irq) | |
213 | return -EINVAL; | |
214 | return drm_irq_install( dev ); | |
215 | case DRM_UNINST_HANDLER: | |
216 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
217 | return 0; | |
218 | return drm_irq_uninstall( dev ); | |
219 | default: | |
220 | return -EINVAL; | |
221 | } | |
222 | } | |
223 | ||
224 | /** | |
225 | * Wait for VBLANK. | |
226 | * | |
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. | |
232 | * | |
233 | * Verifies the IRQ is installed. | |
234 | * | |
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 | |
239 | * task. | |
240 | * | |
241 | * If a signal is not requested, then calls vblank_wait(). | |
242 | */ | |
243 | int drm_wait_vblank( DRM_IOCTL_ARGS ) | |
244 | { | |
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; | |
249 | struct timeval now; | |
250 | int ret = 0; | |
251 | unsigned int flags; | |
252 | ||
253 | if (!drm_core_check_feature(dev, DRIVER_IRQ_VBL)) | |
254 | return -EINVAL; | |
255 | ||
256 | if (!dev->irq) | |
257 | return -EINVAL; | |
258 | ||
259 | DRM_COPY_FROM_USER_IOCTL( vblwait, argp, sizeof(vblwait) ); | |
260 | ||
261 | switch ( vblwait.request.type & ~_DRM_VBLANK_FLAGS_MASK ) { | |
262 | case _DRM_VBLANK_RELATIVE: | |
263 | vblwait.request.sequence += atomic_read( &dev->vbl_received ); | |
264 | vblwait.request.type &= ~_DRM_VBLANK_RELATIVE; | |
265 | case _DRM_VBLANK_ABSOLUTE: | |
266 | break; | |
267 | default: | |
268 | return -EINVAL; | |
269 | } | |
270 | ||
271 | flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK; | |
272 | ||
273 | if ( flags & _DRM_VBLANK_SIGNAL ) { | |
274 | unsigned long irqflags; | |
275 | drm_vbl_sig_t *vbl_sig; | |
276 | ||
277 | vblwait.reply.sequence = atomic_read( &dev->vbl_received ); | |
278 | ||
279 | spin_lock_irqsave( &dev->vbl_lock, irqflags ); | |
280 | ||
281 | /* Check if this task has already scheduled the same signal | |
282 | * for the same vblank sequence number; nothing to be done in | |
283 | * that case | |
284 | */ | |
285 | list_for_each_entry( vbl_sig, &dev->vbl_sigs.head, head ) { | |
286 | if (vbl_sig->sequence == vblwait.request.sequence | |
287 | && vbl_sig->info.si_signo == vblwait.request.signal | |
288 | && vbl_sig->task == current) | |
289 | { | |
290 | spin_unlock_irqrestore( &dev->vbl_lock, irqflags ); | |
291 | goto done; | |
292 | } | |
293 | } | |
294 | ||
295 | if ( dev->vbl_pending >= 100 ) { | |
296 | spin_unlock_irqrestore( &dev->vbl_lock, irqflags ); | |
297 | return -EBUSY; | |
298 | } | |
299 | ||
300 | dev->vbl_pending++; | |
301 | ||
302 | spin_unlock_irqrestore( &dev->vbl_lock, irqflags ); | |
303 | ||
304 | if ( !( vbl_sig = drm_alloc( sizeof( drm_vbl_sig_t ), DRM_MEM_DRIVER ) ) ) { | |
305 | return -ENOMEM; | |
306 | } | |
307 | ||
308 | memset( (void *)vbl_sig, 0, sizeof(*vbl_sig) ); | |
309 | ||
310 | vbl_sig->sequence = vblwait.request.sequence; | |
311 | vbl_sig->info.si_signo = vblwait.request.signal; | |
312 | vbl_sig->task = current; | |
313 | ||
314 | spin_lock_irqsave( &dev->vbl_lock, irqflags ); | |
315 | ||
316 | list_add_tail( (struct list_head *) vbl_sig, &dev->vbl_sigs.head ); | |
317 | ||
318 | spin_unlock_irqrestore( &dev->vbl_lock, irqflags ); | |
319 | } else { | |
320 | if (dev->driver->vblank_wait) | |
321 | ret = dev->driver->vblank_wait( dev, &vblwait.request.sequence ); | |
322 | ||
323 | do_gettimeofday( &now ); | |
324 | vblwait.reply.tval_sec = now.tv_sec; | |
325 | vblwait.reply.tval_usec = now.tv_usec; | |
326 | } | |
327 | ||
328 | done: | |
329 | DRM_COPY_TO_USER_IOCTL( argp, vblwait, sizeof(vblwait) ); | |
330 | ||
331 | return ret; | |
332 | } | |
333 | ||
334 | /** | |
335 | * Send the VBLANK signals. | |
336 | * | |
337 | * \param dev DRM device. | |
338 | * | |
339 | * Sends a signal for each task in drm_device::vbl_sigs and empties the list. | |
340 | * | |
341 | * If a signal is not requested, then calls vblank_wait(). | |
342 | */ | |
343 | void drm_vbl_send_signals( drm_device_t *dev ) | |
344 | { | |
345 | struct list_head *list, *tmp; | |
346 | drm_vbl_sig_t *vbl_sig; | |
347 | unsigned int vbl_seq = atomic_read( &dev->vbl_received ); | |
348 | unsigned long flags; | |
349 | ||
350 | spin_lock_irqsave( &dev->vbl_lock, flags ); | |
351 | ||
352 | list_for_each_safe( list, tmp, &dev->vbl_sigs.head ) { | |
353 | vbl_sig = list_entry( list, drm_vbl_sig_t, head ); | |
354 | if ( ( vbl_seq - vbl_sig->sequence ) <= (1<<23) ) { | |
355 | vbl_sig->info.si_code = vbl_seq; | |
356 | send_sig_info( vbl_sig->info.si_signo, &vbl_sig->info, vbl_sig->task ); | |
357 | ||
358 | list_del( list ); | |
359 | ||
360 | drm_free( vbl_sig, sizeof(*vbl_sig), DRM_MEM_DRIVER ); | |
361 | ||
362 | dev->vbl_pending--; | |
363 | } | |
364 | } | |
365 | ||
366 | spin_unlock_irqrestore( &dev->vbl_lock, flags ); | |
367 | } | |
368 | EXPORT_SYMBOL(drm_vbl_send_signals); | |
369 | ||
370 |