]>
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 | 43 | * \param inode device inode. |
6c340eac | 44 | * \param file_priv DRM file private. |
1da177e4 LT |
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 | */ | |
c153f45f EA |
53 | int drm_irq_by_busid(struct drm_device *dev, void *data, |
54 | struct drm_file *file_priv) | |
1da177e4 | 55 | { |
c153f45f | 56 | struct drm_irq_busid *p = data; |
1da177e4 LT |
57 | |
58 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
59 | return -EINVAL; | |
60 | ||
c153f45f EA |
61 | if ((p->busnum >> 8) != drm_get_pci_domain(dev) || |
62 | (p->busnum & 0xff) != dev->pdev->bus->number || | |
63 | p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) | |
1da177e4 LT |
64 | return -EINVAL; |
65 | ||
ed4cb414 | 66 | p->irq = dev->pdev->irq; |
c153f45f EA |
67 | |
68 | DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, | |
69 | p->irq); | |
1da177e4 | 70 | |
1da177e4 LT |
71 | return 0; |
72 | } | |
73 | ||
0a3e67a4 JB |
74 | static void vblank_disable_fn(unsigned long arg) |
75 | { | |
76 | struct drm_device *dev = (struct drm_device *)arg; | |
77 | unsigned long irqflags; | |
78 | int i; | |
79 | ||
80 | if (!dev->vblank_disable_allowed) | |
81 | return; | |
82 | ||
83 | for (i = 0; i < dev->num_crtcs; i++) { | |
84 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
85 | if (atomic_read(&dev->vblank_refcount[i]) == 0 && | |
86 | dev->vblank_enabled[i]) { | |
87 | DRM_DEBUG("disabling vblank on crtc %d\n", i); | |
88 | dev->last_vblank[i] = | |
89 | dev->driver->get_vblank_counter(dev, i); | |
90 | dev->driver->disable_vblank(dev, i); | |
91 | dev->vblank_enabled[i] = 0; | |
92 | } | |
93 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
94 | } | |
95 | } | |
96 | ||
52440211 | 97 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 JB |
98 | { |
99 | /* Bail if the driver didn't call drm_vblank_init() */ | |
100 | if (dev->num_crtcs == 0) | |
101 | return; | |
102 | ||
103 | del_timer(&dev->vblank_disable_timer); | |
104 | ||
105 | vblank_disable_fn((unsigned long)dev); | |
106 | ||
9a298b2a EA |
107 | kfree(dev->vbl_queue); |
108 | kfree(dev->_vblank_count); | |
109 | kfree(dev->vblank_refcount); | |
110 | kfree(dev->vblank_enabled); | |
111 | kfree(dev->last_vblank); | |
112 | kfree(dev->last_vblank_wait); | |
113 | kfree(dev->vblank_inmodeset); | |
0a3e67a4 JB |
114 | |
115 | dev->num_crtcs = 0; | |
116 | } | |
117 | ||
118 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) | |
119 | { | |
120 | int i, ret = -ENOMEM; | |
121 | ||
122 | setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, | |
123 | (unsigned long)dev); | |
124 | spin_lock_init(&dev->vbl_lock); | |
0a3e67a4 JB |
125 | dev->num_crtcs = num_crtcs; |
126 | ||
9a298b2a EA |
127 | dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs, |
128 | GFP_KERNEL); | |
0a3e67a4 JB |
129 | if (!dev->vbl_queue) |
130 | goto err; | |
131 | ||
9a298b2a | 132 | dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL); |
0a3e67a4 JB |
133 | if (!dev->_vblank_count) |
134 | goto err; | |
135 | ||
9a298b2a EA |
136 | dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs, |
137 | GFP_KERNEL); | |
0a3e67a4 JB |
138 | if (!dev->vblank_refcount) |
139 | goto err; | |
140 | ||
9a298b2a | 141 | dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
142 | if (!dev->vblank_enabled) |
143 | goto err; | |
144 | ||
9a298b2a | 145 | dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
0a3e67a4 JB |
146 | if (!dev->last_vblank) |
147 | goto err; | |
148 | ||
9a298b2a | 149 | dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
fede5c91 EA |
150 | if (!dev->last_vblank_wait) |
151 | goto err; | |
152 | ||
9a298b2a | 153 | dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
154 | if (!dev->vblank_inmodeset) |
155 | goto err; | |
156 | ||
157 | /* Zero per-crtc vblank stuff */ | |
158 | for (i = 0; i < num_crtcs; i++) { | |
159 | init_waitqueue_head(&dev->vbl_queue[i]); | |
0a3e67a4 JB |
160 | atomic_set(&dev->_vblank_count[i], 0); |
161 | atomic_set(&dev->vblank_refcount[i], 0); | |
162 | } | |
163 | ||
164 | dev->vblank_disable_allowed = 0; | |
165 | ||
166 | return 0; | |
167 | ||
168 | err: | |
169 | drm_vblank_cleanup(dev); | |
170 | return ret; | |
171 | } | |
172 | EXPORT_SYMBOL(drm_vblank_init); | |
173 | ||
1da177e4 LT |
174 | /** |
175 | * Install IRQ handler. | |
176 | * | |
177 | * \param dev DRM device. | |
1da177e4 | 178 | * |
0a3e67a4 | 179 | * Initializes the IRQ related data. Installs the handler, calling the driver |
1da177e4 LT |
180 | * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions |
181 | * before and after the installation. | |
182 | */ | |
0a3e67a4 | 183 | int drm_irq_install(struct drm_device *dev) |
1da177e4 | 184 | { |
0a3e67a4 | 185 | int ret = 0; |
b5e89ed5 | 186 | unsigned long sh_flags = 0; |
b8da7de5 | 187 | char *irqname; |
1da177e4 LT |
188 | |
189 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
190 | return -EINVAL; | |
191 | ||
ed4cb414 | 192 | if (dev->pdev->irq == 0) |
1da177e4 LT |
193 | return -EINVAL; |
194 | ||
30e2fb18 | 195 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
196 | |
197 | /* Driver must have been initialized */ | |
b5e89ed5 | 198 | if (!dev->dev_private) { |
30e2fb18 | 199 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
200 | return -EINVAL; |
201 | } | |
202 | ||
b5e89ed5 | 203 | if (dev->irq_enabled) { |
30e2fb18 | 204 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
205 | return -EBUSY; |
206 | } | |
207 | dev->irq_enabled = 1; | |
30e2fb18 | 208 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 209 | |
ed4cb414 | 210 | DRM_DEBUG("irq=%d\n", dev->pdev->irq); |
1da177e4 | 211 | |
b5e89ed5 | 212 | /* Before installing handler */ |
1da177e4 LT |
213 | dev->driver->irq_preinstall(dev); |
214 | ||
b5e89ed5 | 215 | /* Install handler */ |
1da177e4 | 216 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 217 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 218 | |
b8da7de5 DA |
219 | if (dev->devname) |
220 | irqname = dev->devname; | |
221 | else | |
222 | irqname = dev->driver->name; | |
223 | ||
9bfbd5cb | 224 | ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, |
b8da7de5 | 225 | sh_flags, irqname, dev); |
9bfbd5cb | 226 | |
b5e89ed5 | 227 | if (ret < 0) { |
30e2fb18 | 228 | mutex_lock(&dev->struct_mutex); |
1da177e4 | 229 | dev->irq_enabled = 0; |
30e2fb18 | 230 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
231 | return ret; |
232 | } | |
233 | ||
b5e89ed5 | 234 | /* After installing handler */ |
0a3e67a4 JB |
235 | ret = dev->driver->irq_postinstall(dev); |
236 | if (ret < 0) { | |
237 | mutex_lock(&dev->struct_mutex); | |
238 | dev->irq_enabled = 0; | |
239 | mutex_unlock(&dev->struct_mutex); | |
240 | } | |
1da177e4 | 241 | |
0a3e67a4 | 242 | return ret; |
1da177e4 | 243 | } |
0a3e67a4 | 244 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
245 | |
246 | /** | |
247 | * Uninstall the IRQ handler. | |
248 | * | |
249 | * \param dev DRM device. | |
250 | * | |
251 | * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq. | |
252 | */ | |
84b1fd10 | 253 | int drm_irq_uninstall(struct drm_device * dev) |
1da177e4 | 254 | { |
dc1336ff JB |
255 | unsigned long irqflags; |
256 | int irq_enabled, i; | |
1da177e4 LT |
257 | |
258 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
259 | return -EINVAL; | |
260 | ||
30e2fb18 | 261 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
262 | irq_enabled = dev->irq_enabled; |
263 | dev->irq_enabled = 0; | |
30e2fb18 | 264 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 265 | |
dc1336ff JB |
266 | /* |
267 | * Wake up any waiters so they don't hang. | |
268 | */ | |
269 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
270 | for (i = 0; i < dev->num_crtcs; i++) { | |
271 | DRM_WAKEUP(&dev->vbl_queue[i]); | |
272 | dev->vblank_enabled[i] = 0; | |
14d200c5 | 273 | dev->last_vblank[i] = dev->driver->get_vblank_counter(dev, i); |
dc1336ff JB |
274 | } |
275 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
276 | ||
b5e89ed5 | 277 | if (!irq_enabled) |
1da177e4 LT |
278 | return -EINVAL; |
279 | ||
ed4cb414 | 280 | DRM_DEBUG("irq=%d\n", dev->pdev->irq); |
1da177e4 LT |
281 | |
282 | dev->driver->irq_uninstall(dev); | |
283 | ||
ed4cb414 | 284 | free_irq(dev->pdev->irq, dev); |
1da177e4 LT |
285 | |
286 | return 0; | |
287 | } | |
288 | EXPORT_SYMBOL(drm_irq_uninstall); | |
289 | ||
290 | /** | |
291 | * IRQ control ioctl. | |
292 | * | |
293 | * \param inode device inode. | |
6c340eac | 294 | * \param file_priv DRM file private. |
1da177e4 LT |
295 | * \param cmd command. |
296 | * \param arg user argument, pointing to a drm_control structure. | |
297 | * \return zero on success or a negative number on failure. | |
298 | * | |
299 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
300 | */ | |
c153f45f EA |
301 | int drm_control(struct drm_device *dev, void *data, |
302 | struct drm_file *file_priv) | |
1da177e4 | 303 | { |
c153f45f | 304 | struct drm_control *ctl = data; |
b5e89ed5 | 305 | |
1da177e4 LT |
306 | /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */ |
307 | ||
1da177e4 | 308 | |
c153f45f | 309 | switch (ctl->func) { |
1da177e4 LT |
310 | case DRM_INST_HANDLER: |
311 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
312 | return 0; | |
f453ba04 DA |
313 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
314 | return 0; | |
1da177e4 | 315 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
ed4cb414 | 316 | ctl->irq != dev->pdev->irq) |
1da177e4 | 317 | return -EINVAL; |
b5e89ed5 | 318 | return drm_irq_install(dev); |
1da177e4 LT |
319 | case DRM_UNINST_HANDLER: |
320 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
321 | return 0; | |
f453ba04 DA |
322 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
323 | return 0; | |
b5e89ed5 | 324 | return drm_irq_uninstall(dev); |
1da177e4 LT |
325 | default: |
326 | return -EINVAL; | |
327 | } | |
328 | } | |
329 | ||
0a3e67a4 JB |
330 | /** |
331 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
332 | * @dev: DRM device | |
333 | * @crtc: which counter to retrieve | |
334 | * | |
335 | * Fetches the "cooked" vblank count value that represents the number of | |
336 | * vblank events since the system was booted, including lost events due to | |
337 | * modesetting activity. | |
338 | */ | |
339 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
340 | { | |
341 | return atomic_read(&dev->_vblank_count[crtc]); | |
342 | } | |
343 | EXPORT_SYMBOL(drm_vblank_count); | |
344 | ||
345 | /** | |
346 | * drm_update_vblank_count - update the master vblank counter | |
347 | * @dev: DRM device | |
348 | * @crtc: counter to update | |
349 | * | |
350 | * Call back into the driver to update the appropriate vblank counter | |
351 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
352 | * update the last read value so we can deal with wraparound on the next | |
353 | * call if necessary. | |
354 | * | |
355 | * Only necessary when going from off->on, to account for frames we | |
356 | * didn't get an interrupt for. | |
357 | * | |
358 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
359 | * device vblank fields. | |
360 | */ | |
361 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
362 | { | |
363 | u32 cur_vblank, diff; | |
364 | ||
365 | /* | |
366 | * Interrupts were disabled prior to this call, so deal with counter | |
367 | * wrap if needed. | |
368 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
369 | * here if the register is small or we had vblank interrupts off for | |
370 | * a long time. | |
371 | */ | |
372 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
373 | diff = cur_vblank - dev->last_vblank[crtc]; | |
374 | if (cur_vblank < dev->last_vblank[crtc]) { | |
375 | diff += dev->max_vblank_count; | |
376 | ||
377 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
378 | crtc, dev->last_vblank[crtc], cur_vblank, diff); | |
379 | } | |
380 | ||
381 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", | |
382 | crtc, diff); | |
383 | ||
384 | atomic_add(diff, &dev->_vblank_count[crtc]); | |
385 | } | |
386 | ||
387 | /** | |
388 | * drm_vblank_get - get a reference count on vblank events | |
389 | * @dev: DRM device | |
390 | * @crtc: which CRTC to own | |
391 | * | |
392 | * Acquire a reference count on vblank events to avoid having them disabled | |
393 | * while in use. | |
394 | * | |
395 | * RETURNS | |
396 | * Zero on success, nonzero on failure. | |
397 | */ | |
398 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
399 | { | |
400 | unsigned long irqflags; | |
401 | int ret = 0; | |
402 | ||
403 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
404 | /* Going from 0->1 means we have to enable interrupts again */ | |
405 | if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1 && | |
406 | !dev->vblank_enabled[crtc]) { | |
407 | ret = dev->driver->enable_vblank(dev, crtc); | |
408 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); | |
409 | if (ret) | |
410 | atomic_dec(&dev->vblank_refcount[crtc]); | |
411 | else { | |
412 | dev->vblank_enabled[crtc] = 1; | |
413 | drm_update_vblank_count(dev, crtc); | |
414 | } | |
415 | } | |
416 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
417 | ||
418 | return ret; | |
419 | } | |
420 | EXPORT_SYMBOL(drm_vblank_get); | |
421 | ||
422 | /** | |
423 | * drm_vblank_put - give up ownership of vblank events | |
424 | * @dev: DRM device | |
425 | * @crtc: which counter to give up | |
426 | * | |
427 | * Release ownership of a given vblank counter, turning off interrupts | |
428 | * if possible. | |
429 | */ | |
430 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
431 | { | |
b3f5e732 CW |
432 | BUG_ON (atomic_read (&dev->vblank_refcount[crtc]) == 0); |
433 | ||
0a3e67a4 JB |
434 | /* Last user schedules interrupt disable */ |
435 | if (atomic_dec_and_test(&dev->vblank_refcount[crtc])) | |
436 | mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ); | |
437 | } | |
438 | EXPORT_SYMBOL(drm_vblank_put); | |
439 | ||
f453ba04 DA |
440 | /** |
441 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
442 | * @dev: DRM device | |
443 | * @crtc: CRTC in question | |
444 | * @post: post or pre mode set? | |
445 | * | |
446 | * Account for vblank events across mode setting events, which will likely | |
447 | * reset the hardware frame counter. | |
448 | */ | |
449 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
450 | { | |
451 | /* | |
452 | * To avoid all the problems that might happen if interrupts | |
453 | * were enabled/disabled around or between these calls, we just | |
454 | * have the kernel take a reference on the CRTC (just once though | |
455 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
456 | * so that interrupts remain enabled in the interim. | |
457 | */ | |
458 | if (!dev->vblank_inmodeset[crtc]) { | |
b3f5e732 CW |
459 | dev->vblank_inmodeset[crtc] = 0x1; |
460 | if (drm_vblank_get(dev, crtc) == 0) | |
461 | dev->vblank_inmodeset[crtc] |= 0x2; | |
f453ba04 DA |
462 | } |
463 | } | |
464 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
465 | ||
466 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) | |
467 | { | |
468 | unsigned long irqflags; | |
469 | ||
470 | if (dev->vblank_inmodeset[crtc]) { | |
471 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
472 | dev->vblank_disable_allowed = 1; | |
f453ba04 | 473 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 CW |
474 | |
475 | if (dev->vblank_inmodeset[crtc] & 0x2) | |
476 | drm_vblank_put(dev, crtc); | |
477 | ||
478 | dev->vblank_inmodeset[crtc] = 0; | |
f453ba04 DA |
479 | } |
480 | } | |
481 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
482 | ||
0a3e67a4 JB |
483 | /** |
484 | * drm_modeset_ctl - handle vblank event counter changes across mode switch | |
485 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
486 | * | |
487 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
488 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
489 | * | |
490 | * Generally the counter will reset across mode sets. If interrupts are | |
491 | * enabled around this call, we don't have to do anything since the counter | |
492 | * will have already been incremented. | |
493 | */ | |
494 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
495 | struct drm_file *file_priv) | |
496 | { | |
497 | struct drm_modeset_ctl *modeset = data; | |
0a3e67a4 JB |
498 | int crtc, ret = 0; |
499 | ||
500 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
501 | if (!dev->num_crtcs) | |
502 | goto out; | |
503 | ||
504 | crtc = modeset->crtc; | |
505 | if (crtc >= dev->num_crtcs) { | |
506 | ret = -EINVAL; | |
507 | goto out; | |
508 | } | |
509 | ||
0a3e67a4 JB |
510 | switch (modeset->cmd) { |
511 | case _DRM_PRE_MODESET: | |
f453ba04 | 512 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
513 | break; |
514 | case _DRM_POST_MODESET: | |
f453ba04 | 515 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
516 | break; |
517 | default: | |
518 | ret = -EINVAL; | |
519 | break; | |
520 | } | |
521 | ||
522 | out: | |
523 | return ret; | |
524 | } | |
525 | ||
1da177e4 LT |
526 | /** |
527 | * Wait for VBLANK. | |
528 | * | |
529 | * \param inode device inode. | |
6c340eac | 530 | * \param file_priv DRM file private. |
1da177e4 LT |
531 | * \param cmd command. |
532 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
533 | * \return zero on success or a negative number on failure. | |
534 | * | |
30b23634 EA |
535 | * This function enables the vblank interrupt on the pipe requested, then |
536 | * sleeps waiting for the requested sequence number to occur, and drops | |
537 | * the vblank interrupt refcount afterwards. (vblank irq disable follows that | |
538 | * after a timeout with no further vblank waits scheduled). | |
1da177e4 | 539 | */ |
0a3e67a4 JB |
540 | int drm_wait_vblank(struct drm_device *dev, void *data, |
541 | struct drm_file *file_priv) | |
1da177e4 | 542 | { |
c153f45f | 543 | union drm_wait_vblank *vblwait = data; |
1da177e4 | 544 | int ret = 0; |
0a3e67a4 | 545 | unsigned int flags, seq, crtc; |
1da177e4 | 546 | |
ed4cb414 | 547 | if ((!dev->pdev->irq) || (!dev->irq_enabled)) |
1da177e4 LT |
548 | return -EINVAL; |
549 | ||
30b23634 EA |
550 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
551 | return -EINVAL; | |
552 | ||
c153f45f | 553 | if (vblwait->request.type & |
776c9443 MD |
554 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) { |
555 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", | |
c153f45f | 556 | vblwait->request.type, |
776c9443 MD |
557 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)); |
558 | return -EINVAL; | |
559 | } | |
560 | ||
c153f45f | 561 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
0a3e67a4 | 562 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
776c9443 | 563 | |
0a3e67a4 | 564 | if (crtc >= dev->num_crtcs) |
776c9443 MD |
565 | return -EINVAL; |
566 | ||
0a3e67a4 JB |
567 | ret = drm_vblank_get(dev, crtc); |
568 | if (ret) { | |
8d3457ec | 569 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
570 | return ret; |
571 | } | |
572 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 573 | |
c153f45f | 574 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 575 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
576 | vblwait->request.sequence += seq; |
577 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
578 | case _DRM_VBLANK_ABSOLUTE: |
579 | break; | |
580 | default: | |
0a3e67a4 JB |
581 | ret = -EINVAL; |
582 | goto done; | |
1da177e4 LT |
583 | } |
584 | ||
ab285d74 | 585 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
586 | (seq - vblwait->request.sequence) <= (1<<23)) { |
587 | vblwait->request.sequence = seq + 1; | |
ab285d74 MD |
588 | } |
589 | ||
30b23634 EA |
590 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
591 | vblwait->request.sequence, crtc); | |
592 | dev->last_vblank_wait[crtc] = vblwait->request.sequence; | |
593 | DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ, | |
594 | (((drm_vblank_count(dev, crtc) - | |
595 | vblwait->request.sequence) <= (1 << 23)) || | |
596 | !dev->irq_enabled)); | |
1da177e4 | 597 | |
30b23634 EA |
598 | if (ret != -EINTR) { |
599 | struct timeval now; | |
1da177e4 | 600 | |
30b23634 | 601 | do_gettimeofday(&now); |
049b3233 | 602 | |
30b23634 EA |
603 | vblwait->reply.tval_sec = now.tv_sec; |
604 | vblwait->reply.tval_usec = now.tv_usec; | |
605 | vblwait->reply.sequence = drm_vblank_count(dev, crtc); | |
606 | DRM_DEBUG("returning %d to client\n", | |
607 | vblwait->reply.sequence); | |
1da177e4 | 608 | } else { |
30b23634 | 609 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
610 | } |
611 | ||
0a3e67a4 JB |
612 | done: |
613 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
614 | return ret; |
615 | } | |
616 | ||
0a3e67a4 JB |
617 | /** |
618 | * drm_handle_vblank - handle a vblank event | |
619 | * @dev: DRM device | |
620 | * @crtc: where this event occurred | |
621 | * | |
622 | * Drivers should call this routine in their vblank interrupt handlers to | |
623 | * update the vblank counter and send any signals that may be pending. | |
624 | */ | |
625 | void drm_handle_vblank(struct drm_device *dev, int crtc) | |
626 | { | |
627 | atomic_inc(&dev->_vblank_count[crtc]); | |
628 | DRM_WAKEUP(&dev->vbl_queue[crtc]); | |
0a3e67a4 JB |
629 | } |
630 | EXPORT_SYMBOL(drm_handle_vblank); |