Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_irq.c |
1da177e4 LT |
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. | |
b5e89ed5 | 42 | * |
1da177e4 LT |
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. | |
b5e89ed5 | 48 | * |
1da177e4 LT |
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, | |
b5e89ed5 | 54 | unsigned int cmd, unsigned long arg) |
1da177e4 LT |
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 | ||
33229601 | 67 | if ((p.busnum >> 8) != drm_get_pci_domain(dev) || |
242ef0e1 D |
68 | (p.busnum & 0xff) != dev->pdev->bus->number || |
69 | p.devnum != PCI_SLOT(dev->pdev->devfn) || p.funcnum != PCI_FUNC(dev->pdev->devfn)) | |
1da177e4 LT |
70 | return -EINVAL; |
71 | ||
72 | p.irq = dev->irq; | |
73 | ||
b5e89ed5 | 74 | DRM_DEBUG("%d:%d:%d => IRQ %d\n", p.busnum, p.devnum, p.funcnum, p.irq); |
1da177e4 LT |
75 | if (copy_to_user(argp, &p, sizeof(p))) |
76 | return -EFAULT; | |
77 | return 0; | |
78 | } | |
79 | ||
80 | /** | |
81 | * Install IRQ handler. | |
82 | * | |
83 | * \param dev DRM device. | |
84 | * \param irq IRQ number. | |
85 | * | |
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. | |
89 | */ | |
b5e89ed5 | 90 | static int drm_irq_install(drm_device_t * dev) |
1da177e4 LT |
91 | { |
92 | int ret; | |
b5e89ed5 | 93 | unsigned long sh_flags = 0; |
1da177e4 LT |
94 | |
95 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
96 | return -EINVAL; | |
97 | ||
b5e89ed5 | 98 | if (dev->irq == 0) |
1da177e4 LT |
99 | return -EINVAL; |
100 | ||
30e2fb18 | 101 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
102 | |
103 | /* Driver must have been initialized */ | |
b5e89ed5 | 104 | if (!dev->dev_private) { |
30e2fb18 | 105 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
106 | return -EINVAL; |
107 | } | |
108 | ||
b5e89ed5 | 109 | if (dev->irq_enabled) { |
30e2fb18 | 110 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
111 | return -EBUSY; |
112 | } | |
113 | dev->irq_enabled = 1; | |
30e2fb18 | 114 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 115 | |
b5e89ed5 | 116 | DRM_DEBUG("%s: irq=%d\n", __FUNCTION__, dev->irq); |
1da177e4 LT |
117 | |
118 | if (drm_core_check_feature(dev, DRIVER_IRQ_VBL)) { | |
119 | init_waitqueue_head(&dev->vbl_queue); | |
b5e89ed5 DA |
120 | |
121 | spin_lock_init(&dev->vbl_lock); | |
122 | ||
123 | INIT_LIST_HEAD(&dev->vbl_sigs.head); | |
124 | ||
1da177e4 LT |
125 | dev->vbl_pending = 0; |
126 | } | |
127 | ||
b5e89ed5 | 128 | /* Before installing handler */ |
1da177e4 LT |
129 | dev->driver->irq_preinstall(dev); |
130 | ||
b5e89ed5 | 131 | /* Install handler */ |
1da177e4 | 132 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 133 | sh_flags = IRQF_SHARED; |
b5e89ed5 DA |
134 | |
135 | ret = request_irq(dev->irq, dev->driver->irq_handler, | |
136 | sh_flags, dev->devname, dev); | |
137 | if (ret < 0) { | |
30e2fb18 | 138 | mutex_lock(&dev->struct_mutex); |
1da177e4 | 139 | dev->irq_enabled = 0; |
30e2fb18 | 140 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
141 | return ret; |
142 | } | |
143 | ||
b5e89ed5 | 144 | /* After installing handler */ |
1da177e4 LT |
145 | dev->driver->irq_postinstall(dev); |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | /** | |
151 | * Uninstall the IRQ handler. | |
152 | * | |
153 | * \param dev DRM device. | |
154 | * | |
155 | * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq. | |
156 | */ | |
b5e89ed5 | 157 | int drm_irq_uninstall(drm_device_t * dev) |
1da177e4 LT |
158 | { |
159 | int irq_enabled; | |
160 | ||
161 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
162 | return -EINVAL; | |
163 | ||
30e2fb18 | 164 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
165 | irq_enabled = dev->irq_enabled; |
166 | dev->irq_enabled = 0; | |
30e2fb18 | 167 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 168 | |
b5e89ed5 | 169 | if (!irq_enabled) |
1da177e4 LT |
170 | return -EINVAL; |
171 | ||
b5e89ed5 | 172 | DRM_DEBUG("%s: irq=%d\n", __FUNCTION__, dev->irq); |
1da177e4 LT |
173 | |
174 | dev->driver->irq_uninstall(dev); | |
175 | ||
b5e89ed5 | 176 | free_irq(dev->irq, dev); |
1da177e4 LT |
177 | |
178 | return 0; | |
179 | } | |
b5e89ed5 | 180 | |
1da177e4 LT |
181 | EXPORT_SYMBOL(drm_irq_uninstall); |
182 | ||
183 | /** | |
184 | * IRQ control ioctl. | |
185 | * | |
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. | |
191 | * | |
192 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
193 | */ | |
b5e89ed5 DA |
194 | int drm_control(struct inode *inode, struct file *filp, |
195 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
196 | { |
197 | drm_file_t *priv = filp->private_data; | |
198 | drm_device_t *dev = priv->head->dev; | |
199 | drm_control_t ctl; | |
b5e89ed5 | 200 | |
1da177e4 LT |
201 | /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */ |
202 | ||
b5e89ed5 | 203 | if (copy_from_user(&ctl, (drm_control_t __user *) arg, sizeof(ctl))) |
1da177e4 LT |
204 | return -EFAULT; |
205 | ||
b5e89ed5 | 206 | switch (ctl.func) { |
1da177e4 LT |
207 | case DRM_INST_HANDLER: |
208 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
209 | return 0; | |
210 | if (dev->if_version < DRM_IF_VERSION(1, 2) && | |
211 | ctl.irq != dev->irq) | |
212 | return -EINVAL; | |
b5e89ed5 | 213 | return drm_irq_install(dev); |
1da177e4 LT |
214 | case DRM_UNINST_HANDLER: |
215 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
216 | return 0; | |
b5e89ed5 | 217 | return drm_irq_uninstall(dev); |
1da177e4 LT |
218 | default: |
219 | return -EINVAL; | |
220 | } | |
221 | } | |
222 | ||
223 | /** | |
224 | * Wait for VBLANK. | |
225 | * | |
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. | |
231 | * | |
b5e89ed5 | 232 | * Verifies the IRQ is installed. |
1da177e4 LT |
233 | * |
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 | |
238 | * task. | |
239 | * | |
240 | * If a signal is not requested, then calls vblank_wait(). | |
241 | */ | |
b5e89ed5 | 242 | int drm_wait_vblank(DRM_IOCTL_ARGS) |
1da177e4 LT |
243 | { |
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; | |
248 | struct timeval now; | |
249 | int ret = 0; | |
250 | unsigned int flags; | |
251 | ||
252 | if (!drm_core_check_feature(dev, DRIVER_IRQ_VBL)) | |
253 | return -EINVAL; | |
254 | ||
255 | if (!dev->irq) | |
256 | return -EINVAL; | |
257 | ||
3d77461e DA |
258 | if (copy_from_user(&vblwait, argp, sizeof(vblwait))) |
259 | return -EFAULT; | |
1da177e4 | 260 | |
b5e89ed5 | 261 | switch (vblwait.request.type & ~_DRM_VBLANK_FLAGS_MASK) { |
1da177e4 | 262 | case _DRM_VBLANK_RELATIVE: |
b5e89ed5 | 263 | vblwait.request.sequence += atomic_read(&dev->vbl_received); |
1da177e4 LT |
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; | |
b5e89ed5 DA |
272 | |
273 | if (flags & _DRM_VBLANK_SIGNAL) { | |
1da177e4 LT |
274 | unsigned long irqflags; |
275 | drm_vbl_sig_t *vbl_sig; | |
1da177e4 | 276 | |
b5e89ed5 DA |
277 | vblwait.reply.sequence = atomic_read(&dev->vbl_received); |
278 | ||
279 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1da177e4 LT |
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 | */ | |
b5e89ed5 | 285 | list_for_each_entry(vbl_sig, &dev->vbl_sigs.head, head) { |
1da177e4 LT |
286 | if (vbl_sig->sequence == vblwait.request.sequence |
287 | && vbl_sig->info.si_signo == vblwait.request.signal | |
b5e89ed5 DA |
288 | && vbl_sig->task == current) { |
289 | spin_unlock_irqrestore(&dev->vbl_lock, | |
290 | irqflags); | |
1da177e4 LT |
291 | goto done; |
292 | } | |
293 | } | |
294 | ||
b5e89ed5 DA |
295 | if (dev->vbl_pending >= 100) { |
296 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1da177e4 LT |
297 | return -EBUSY; |
298 | } | |
299 | ||
300 | dev->vbl_pending++; | |
301 | ||
b5e89ed5 | 302 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1da177e4 | 303 | |
b5e89ed5 DA |
304 | if (! |
305 | (vbl_sig = | |
306 | drm_alloc(sizeof(drm_vbl_sig_t), DRM_MEM_DRIVER))) { | |
1da177e4 LT |
307 | return -ENOMEM; |
308 | } | |
309 | ||
b5e89ed5 | 310 | memset((void *)vbl_sig, 0, sizeof(*vbl_sig)); |
1da177e4 LT |
311 | |
312 | vbl_sig->sequence = vblwait.request.sequence; | |
313 | vbl_sig->info.si_signo = vblwait.request.signal; | |
314 | vbl_sig->task = current; | |
315 | ||
b5e89ed5 | 316 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1da177e4 | 317 | |
b5e89ed5 | 318 | list_add_tail((struct list_head *)vbl_sig, &dev->vbl_sigs.head); |
1da177e4 | 319 | |
b5e89ed5 | 320 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1da177e4 LT |
321 | } else { |
322 | if (dev->driver->vblank_wait) | |
b5e89ed5 DA |
323 | ret = |
324 | dev->driver->vblank_wait(dev, | |
325 | &vblwait.request.sequence); | |
1da177e4 | 326 | |
b5e89ed5 | 327 | do_gettimeofday(&now); |
1da177e4 LT |
328 | vblwait.reply.tval_sec = now.tv_sec; |
329 | vblwait.reply.tval_usec = now.tv_usec; | |
330 | } | |
331 | ||
b5e89ed5 | 332 | done: |
3d77461e DA |
333 | if (copy_to_user(argp, &vblwait, sizeof(vblwait))) |
334 | return -EFAULT; | |
1da177e4 LT |
335 | |
336 | return ret; | |
337 | } | |
338 | ||
339 | /** | |
340 | * Send the VBLANK signals. | |
341 | * | |
342 | * \param dev DRM device. | |
343 | * | |
344 | * Sends a signal for each task in drm_device::vbl_sigs and empties the list. | |
345 | * | |
346 | * If a signal is not requested, then calls vblank_wait(). | |
347 | */ | |
b5e89ed5 | 348 | void drm_vbl_send_signals(drm_device_t * dev) |
1da177e4 LT |
349 | { |
350 | struct list_head *list, *tmp; | |
351 | drm_vbl_sig_t *vbl_sig; | |
b5e89ed5 | 352 | unsigned int vbl_seq = atomic_read(&dev->vbl_received); |
1da177e4 LT |
353 | unsigned long flags; |
354 | ||
b5e89ed5 | 355 | spin_lock_irqsave(&dev->vbl_lock, flags); |
1da177e4 | 356 | |
b5e89ed5 DA |
357 | list_for_each_safe(list, tmp, &dev->vbl_sigs.head) { |
358 | vbl_sig = list_entry(list, drm_vbl_sig_t, head); | |
359 | if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) { | |
1da177e4 | 360 | vbl_sig->info.si_code = vbl_seq; |
b5e89ed5 DA |
361 | send_sig_info(vbl_sig->info.si_signo, &vbl_sig->info, |
362 | vbl_sig->task); | |
1da177e4 | 363 | |
b5e89ed5 | 364 | list_del(list); |
1da177e4 | 365 | |
b5e89ed5 | 366 | drm_free(vbl_sig, sizeof(*vbl_sig), DRM_MEM_DRIVER); |
1da177e4 LT |
367 | |
368 | dev->vbl_pending--; | |
369 | } | |
370 | } | |
371 | ||
b5e89ed5 | 372 | spin_unlock_irqrestore(&dev->vbl_lock, flags); |
1da177e4 | 373 | } |
1da177e4 | 374 | |
b5e89ed5 | 375 | EXPORT_SYMBOL(drm_vbl_send_signals); |