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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 | ||
107 | drm_free(dev->vbl_queue, sizeof(*dev->vbl_queue) * dev->num_crtcs, | |
108 | DRM_MEM_DRIVER); | |
109 | drm_free(dev->vbl_sigs, sizeof(*dev->vbl_sigs) * dev->num_crtcs, | |
110 | DRM_MEM_DRIVER); | |
111 | drm_free(dev->_vblank_count, sizeof(*dev->_vblank_count) * | |
112 | dev->num_crtcs, DRM_MEM_DRIVER); | |
113 | drm_free(dev->vblank_refcount, sizeof(*dev->vblank_refcount) * | |
114 | dev->num_crtcs, DRM_MEM_DRIVER); | |
115 | drm_free(dev->vblank_enabled, sizeof(*dev->vblank_enabled) * | |
116 | dev->num_crtcs, DRM_MEM_DRIVER); | |
117 | drm_free(dev->last_vblank, sizeof(*dev->last_vblank) * dev->num_crtcs, | |
118 | DRM_MEM_DRIVER); | |
fede5c91 EA |
119 | drm_free(dev->last_vblank_wait, |
120 | sizeof(*dev->last_vblank_wait) * dev->num_crtcs, | |
121 | DRM_MEM_DRIVER); | |
0a3e67a4 JB |
122 | drm_free(dev->vblank_inmodeset, sizeof(*dev->vblank_inmodeset) * |
123 | dev->num_crtcs, DRM_MEM_DRIVER); | |
124 | ||
125 | dev->num_crtcs = 0; | |
126 | } | |
127 | ||
128 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) | |
129 | { | |
130 | int i, ret = -ENOMEM; | |
131 | ||
132 | setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, | |
133 | (unsigned long)dev); | |
134 | spin_lock_init(&dev->vbl_lock); | |
135 | atomic_set(&dev->vbl_signal_pending, 0); | |
136 | dev->num_crtcs = num_crtcs; | |
137 | ||
138 | dev->vbl_queue = drm_alloc(sizeof(wait_queue_head_t) * num_crtcs, | |
139 | DRM_MEM_DRIVER); | |
140 | if (!dev->vbl_queue) | |
141 | goto err; | |
142 | ||
143 | dev->vbl_sigs = drm_alloc(sizeof(struct list_head) * num_crtcs, | |
144 | DRM_MEM_DRIVER); | |
145 | if (!dev->vbl_sigs) | |
146 | goto err; | |
147 | ||
148 | dev->_vblank_count = drm_alloc(sizeof(atomic_t) * num_crtcs, | |
149 | DRM_MEM_DRIVER); | |
150 | if (!dev->_vblank_count) | |
151 | goto err; | |
152 | ||
153 | dev->vblank_refcount = drm_alloc(sizeof(atomic_t) * num_crtcs, | |
154 | DRM_MEM_DRIVER); | |
155 | if (!dev->vblank_refcount) | |
156 | goto err; | |
157 | ||
158 | dev->vblank_enabled = drm_calloc(num_crtcs, sizeof(int), | |
159 | DRM_MEM_DRIVER); | |
160 | if (!dev->vblank_enabled) | |
161 | goto err; | |
162 | ||
163 | dev->last_vblank = drm_calloc(num_crtcs, sizeof(u32), DRM_MEM_DRIVER); | |
164 | if (!dev->last_vblank) | |
165 | goto err; | |
166 | ||
fede5c91 EA |
167 | dev->last_vblank_wait = drm_calloc(num_crtcs, sizeof(u32), |
168 | DRM_MEM_DRIVER); | |
169 | if (!dev->last_vblank_wait) | |
170 | goto err; | |
171 | ||
0a3e67a4 JB |
172 | dev->vblank_inmodeset = drm_calloc(num_crtcs, sizeof(int), |
173 | DRM_MEM_DRIVER); | |
174 | if (!dev->vblank_inmodeset) | |
175 | goto err; | |
176 | ||
177 | /* Zero per-crtc vblank stuff */ | |
178 | for (i = 0; i < num_crtcs; i++) { | |
179 | init_waitqueue_head(&dev->vbl_queue[i]); | |
180 | INIT_LIST_HEAD(&dev->vbl_sigs[i]); | |
181 | atomic_set(&dev->_vblank_count[i], 0); | |
182 | atomic_set(&dev->vblank_refcount[i], 0); | |
183 | } | |
184 | ||
185 | dev->vblank_disable_allowed = 0; | |
186 | ||
187 | return 0; | |
188 | ||
189 | err: | |
190 | drm_vblank_cleanup(dev); | |
191 | return ret; | |
192 | } | |
193 | EXPORT_SYMBOL(drm_vblank_init); | |
194 | ||
1da177e4 LT |
195 | /** |
196 | * Install IRQ handler. | |
197 | * | |
198 | * \param dev DRM device. | |
1da177e4 | 199 | * |
0a3e67a4 | 200 | * Initializes the IRQ related data. Installs the handler, calling the driver |
1da177e4 LT |
201 | * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions |
202 | * before and after the installation. | |
203 | */ | |
0a3e67a4 | 204 | int drm_irq_install(struct drm_device *dev) |
1da177e4 | 205 | { |
0a3e67a4 | 206 | int ret = 0; |
b5e89ed5 | 207 | unsigned long sh_flags = 0; |
1da177e4 LT |
208 | |
209 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
210 | return -EINVAL; | |
211 | ||
ed4cb414 | 212 | if (dev->pdev->irq == 0) |
1da177e4 LT |
213 | return -EINVAL; |
214 | ||
30e2fb18 | 215 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
216 | |
217 | /* Driver must have been initialized */ | |
b5e89ed5 | 218 | if (!dev->dev_private) { |
30e2fb18 | 219 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
220 | return -EINVAL; |
221 | } | |
222 | ||
b5e89ed5 | 223 | if (dev->irq_enabled) { |
30e2fb18 | 224 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
225 | return -EBUSY; |
226 | } | |
227 | dev->irq_enabled = 1; | |
30e2fb18 | 228 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 229 | |
ed4cb414 | 230 | DRM_DEBUG("irq=%d\n", dev->pdev->irq); |
1da177e4 | 231 | |
b5e89ed5 | 232 | /* Before installing handler */ |
1da177e4 LT |
233 | dev->driver->irq_preinstall(dev); |
234 | ||
b5e89ed5 | 235 | /* Install handler */ |
1da177e4 | 236 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 237 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 238 | |
9bfbd5cb | 239 | ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, |
b5e89ed5 | 240 | sh_flags, dev->devname, dev); |
9bfbd5cb | 241 | |
b5e89ed5 | 242 | if (ret < 0) { |
30e2fb18 | 243 | mutex_lock(&dev->struct_mutex); |
1da177e4 | 244 | dev->irq_enabled = 0; |
30e2fb18 | 245 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
246 | return ret; |
247 | } | |
248 | ||
b5e89ed5 | 249 | /* After installing handler */ |
0a3e67a4 JB |
250 | ret = dev->driver->irq_postinstall(dev); |
251 | if (ret < 0) { | |
252 | mutex_lock(&dev->struct_mutex); | |
253 | dev->irq_enabled = 0; | |
254 | mutex_unlock(&dev->struct_mutex); | |
255 | } | |
1da177e4 | 256 | |
0a3e67a4 | 257 | return ret; |
1da177e4 | 258 | } |
0a3e67a4 | 259 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
260 | |
261 | /** | |
262 | * Uninstall the IRQ handler. | |
263 | * | |
264 | * \param dev DRM device. | |
265 | * | |
266 | * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq. | |
267 | */ | |
84b1fd10 | 268 | int drm_irq_uninstall(struct drm_device * dev) |
1da177e4 | 269 | { |
dc1336ff JB |
270 | unsigned long irqflags; |
271 | int irq_enabled, i; | |
1da177e4 LT |
272 | |
273 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
274 | return -EINVAL; | |
275 | ||
30e2fb18 | 276 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
277 | irq_enabled = dev->irq_enabled; |
278 | dev->irq_enabled = 0; | |
30e2fb18 | 279 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 280 | |
dc1336ff JB |
281 | /* |
282 | * Wake up any waiters so they don't hang. | |
283 | */ | |
284 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
285 | for (i = 0; i < dev->num_crtcs; i++) { | |
286 | DRM_WAKEUP(&dev->vbl_queue[i]); | |
287 | dev->vblank_enabled[i] = 0; | |
288 | } | |
289 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
290 | ||
b5e89ed5 | 291 | if (!irq_enabled) |
1da177e4 LT |
292 | return -EINVAL; |
293 | ||
ed4cb414 | 294 | DRM_DEBUG("irq=%d\n", dev->pdev->irq); |
1da177e4 LT |
295 | |
296 | dev->driver->irq_uninstall(dev); | |
297 | ||
ed4cb414 | 298 | free_irq(dev->pdev->irq, dev); |
1da177e4 LT |
299 | |
300 | return 0; | |
301 | } | |
302 | EXPORT_SYMBOL(drm_irq_uninstall); | |
303 | ||
304 | /** | |
305 | * IRQ control ioctl. | |
306 | * | |
307 | * \param inode device inode. | |
6c340eac | 308 | * \param file_priv DRM file private. |
1da177e4 LT |
309 | * \param cmd command. |
310 | * \param arg user argument, pointing to a drm_control structure. | |
311 | * \return zero on success or a negative number on failure. | |
312 | * | |
313 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
314 | */ | |
c153f45f EA |
315 | int drm_control(struct drm_device *dev, void *data, |
316 | struct drm_file *file_priv) | |
1da177e4 | 317 | { |
c153f45f | 318 | struct drm_control *ctl = data; |
b5e89ed5 | 319 | |
1da177e4 LT |
320 | /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */ |
321 | ||
1da177e4 | 322 | |
c153f45f | 323 | switch (ctl->func) { |
1da177e4 LT |
324 | case DRM_INST_HANDLER: |
325 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
326 | return 0; | |
f453ba04 DA |
327 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
328 | return 0; | |
1da177e4 | 329 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
ed4cb414 | 330 | ctl->irq != dev->pdev->irq) |
1da177e4 | 331 | return -EINVAL; |
b5e89ed5 | 332 | return drm_irq_install(dev); |
1da177e4 LT |
333 | case DRM_UNINST_HANDLER: |
334 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
335 | return 0; | |
f453ba04 DA |
336 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
337 | return 0; | |
b5e89ed5 | 338 | return drm_irq_uninstall(dev); |
1da177e4 LT |
339 | default: |
340 | return -EINVAL; | |
341 | } | |
342 | } | |
343 | ||
0a3e67a4 JB |
344 | /** |
345 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
346 | * @dev: DRM device | |
347 | * @crtc: which counter to retrieve | |
348 | * | |
349 | * Fetches the "cooked" vblank count value that represents the number of | |
350 | * vblank events since the system was booted, including lost events due to | |
351 | * modesetting activity. | |
352 | */ | |
353 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
354 | { | |
355 | return atomic_read(&dev->_vblank_count[crtc]); | |
356 | } | |
357 | EXPORT_SYMBOL(drm_vblank_count); | |
358 | ||
359 | /** | |
360 | * drm_update_vblank_count - update the master vblank counter | |
361 | * @dev: DRM device | |
362 | * @crtc: counter to update | |
363 | * | |
364 | * Call back into the driver to update the appropriate vblank counter | |
365 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
366 | * update the last read value so we can deal with wraparound on the next | |
367 | * call if necessary. | |
368 | * | |
369 | * Only necessary when going from off->on, to account for frames we | |
370 | * didn't get an interrupt for. | |
371 | * | |
372 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
373 | * device vblank fields. | |
374 | */ | |
375 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
376 | { | |
377 | u32 cur_vblank, diff; | |
378 | ||
379 | /* | |
380 | * Interrupts were disabled prior to this call, so deal with counter | |
381 | * wrap if needed. | |
382 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
383 | * here if the register is small or we had vblank interrupts off for | |
384 | * a long time. | |
385 | */ | |
386 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
387 | diff = cur_vblank - dev->last_vblank[crtc]; | |
388 | if (cur_vblank < dev->last_vblank[crtc]) { | |
389 | diff += dev->max_vblank_count; | |
390 | ||
391 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
392 | crtc, dev->last_vblank[crtc], cur_vblank, diff); | |
393 | } | |
394 | ||
395 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", | |
396 | crtc, diff); | |
397 | ||
398 | atomic_add(diff, &dev->_vblank_count[crtc]); | |
399 | } | |
400 | ||
401 | /** | |
402 | * drm_vblank_get - get a reference count on vblank events | |
403 | * @dev: DRM device | |
404 | * @crtc: which CRTC to own | |
405 | * | |
406 | * Acquire a reference count on vblank events to avoid having them disabled | |
407 | * while in use. | |
408 | * | |
409 | * RETURNS | |
410 | * Zero on success, nonzero on failure. | |
411 | */ | |
412 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
413 | { | |
414 | unsigned long irqflags; | |
415 | int ret = 0; | |
416 | ||
417 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
418 | /* Going from 0->1 means we have to enable interrupts again */ | |
419 | if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1 && | |
420 | !dev->vblank_enabled[crtc]) { | |
421 | ret = dev->driver->enable_vblank(dev, crtc); | |
422 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); | |
423 | if (ret) | |
424 | atomic_dec(&dev->vblank_refcount[crtc]); | |
425 | else { | |
426 | dev->vblank_enabled[crtc] = 1; | |
427 | drm_update_vblank_count(dev, crtc); | |
428 | } | |
429 | } | |
430 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
431 | ||
432 | return ret; | |
433 | } | |
434 | EXPORT_SYMBOL(drm_vblank_get); | |
435 | ||
436 | /** | |
437 | * drm_vblank_put - give up ownership of vblank events | |
438 | * @dev: DRM device | |
439 | * @crtc: which counter to give up | |
440 | * | |
441 | * Release ownership of a given vblank counter, turning off interrupts | |
442 | * if possible. | |
443 | */ | |
444 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
445 | { | |
446 | /* Last user schedules interrupt disable */ | |
447 | if (atomic_dec_and_test(&dev->vblank_refcount[crtc])) | |
448 | mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ); | |
449 | } | |
450 | EXPORT_SYMBOL(drm_vblank_put); | |
451 | ||
f453ba04 DA |
452 | /** |
453 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
454 | * @dev: DRM device | |
455 | * @crtc: CRTC in question | |
456 | * @post: post or pre mode set? | |
457 | * | |
458 | * Account for vblank events across mode setting events, which will likely | |
459 | * reset the hardware frame counter. | |
460 | */ | |
461 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
462 | { | |
463 | /* | |
464 | * To avoid all the problems that might happen if interrupts | |
465 | * were enabled/disabled around or between these calls, we just | |
466 | * have the kernel take a reference on the CRTC (just once though | |
467 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
468 | * so that interrupts remain enabled in the interim. | |
469 | */ | |
470 | if (!dev->vblank_inmodeset[crtc]) { | |
471 | dev->vblank_inmodeset[crtc] = 1; | |
472 | drm_vblank_get(dev, crtc); | |
473 | } | |
474 | } | |
475 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
476 | ||
477 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) | |
478 | { | |
479 | unsigned long irqflags; | |
480 | ||
481 | if (dev->vblank_inmodeset[crtc]) { | |
482 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
483 | dev->vblank_disable_allowed = 1; | |
484 | dev->vblank_inmodeset[crtc] = 0; | |
485 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
486 | drm_vblank_put(dev, crtc); | |
487 | } | |
488 | } | |
489 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
490 | ||
0a3e67a4 JB |
491 | /** |
492 | * drm_modeset_ctl - handle vblank event counter changes across mode switch | |
493 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
494 | * | |
495 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
496 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
497 | * | |
498 | * Generally the counter will reset across mode sets. If interrupts are | |
499 | * enabled around this call, we don't have to do anything since the counter | |
500 | * will have already been incremented. | |
501 | */ | |
502 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
503 | struct drm_file *file_priv) | |
504 | { | |
505 | struct drm_modeset_ctl *modeset = data; | |
0a3e67a4 JB |
506 | int crtc, ret = 0; |
507 | ||
508 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
509 | if (!dev->num_crtcs) | |
510 | goto out; | |
511 | ||
512 | crtc = modeset->crtc; | |
513 | if (crtc >= dev->num_crtcs) { | |
514 | ret = -EINVAL; | |
515 | goto out; | |
516 | } | |
517 | ||
0a3e67a4 JB |
518 | switch (modeset->cmd) { |
519 | case _DRM_PRE_MODESET: | |
f453ba04 | 520 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
521 | break; |
522 | case _DRM_POST_MODESET: | |
f453ba04 | 523 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
524 | break; |
525 | default: | |
526 | ret = -EINVAL; | |
527 | break; | |
528 | } | |
529 | ||
530 | out: | |
531 | return ret; | |
532 | } | |
533 | ||
1da177e4 LT |
534 | /** |
535 | * Wait for VBLANK. | |
536 | * | |
537 | * \param inode device inode. | |
6c340eac | 538 | * \param file_priv DRM file private. |
1da177e4 LT |
539 | * \param cmd command. |
540 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
541 | * \return zero on success or a negative number on failure. | |
542 | * | |
b5e89ed5 | 543 | * Verifies the IRQ is installed. |
1da177e4 LT |
544 | * |
545 | * If a signal is requested checks if this task has already scheduled the same signal | |
546 | * for the same vblank sequence number - nothing to be done in | |
547 | * that case. If the number of tasks waiting for the interrupt exceeds 100 the | |
548 | * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this | |
549 | * task. | |
550 | * | |
551 | * If a signal is not requested, then calls vblank_wait(). | |
552 | */ | |
0a3e67a4 JB |
553 | int drm_wait_vblank(struct drm_device *dev, void *data, |
554 | struct drm_file *file_priv) | |
1da177e4 | 555 | { |
c153f45f | 556 | union drm_wait_vblank *vblwait = data; |
1da177e4 | 557 | int ret = 0; |
0a3e67a4 | 558 | unsigned int flags, seq, crtc; |
1da177e4 | 559 | |
ed4cb414 | 560 | if ((!dev->pdev->irq) || (!dev->irq_enabled)) |
1da177e4 LT |
561 | return -EINVAL; |
562 | ||
c153f45f | 563 | if (vblwait->request.type & |
776c9443 MD |
564 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) { |
565 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", | |
c153f45f | 566 | vblwait->request.type, |
776c9443 MD |
567 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)); |
568 | return -EINVAL; | |
569 | } | |
570 | ||
c153f45f | 571 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
0a3e67a4 | 572 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
776c9443 | 573 | |
0a3e67a4 | 574 | if (crtc >= dev->num_crtcs) |
776c9443 MD |
575 | return -EINVAL; |
576 | ||
0a3e67a4 JB |
577 | ret = drm_vblank_get(dev, crtc); |
578 | if (ret) { | |
579 | DRM_ERROR("failed to acquire vblank counter, %d\n", ret); | |
580 | return ret; | |
581 | } | |
582 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 583 | |
c153f45f | 584 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 585 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
586 | vblwait->request.sequence += seq; |
587 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
588 | case _DRM_VBLANK_ABSOLUTE: |
589 | break; | |
590 | default: | |
0a3e67a4 JB |
591 | ret = -EINVAL; |
592 | goto done; | |
1da177e4 LT |
593 | } |
594 | ||
ab285d74 | 595 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
596 | (seq - vblwait->request.sequence) <= (1<<23)) { |
597 | vblwait->request.sequence = seq + 1; | |
ab285d74 MD |
598 | } |
599 | ||
b5e89ed5 | 600 | if (flags & _DRM_VBLANK_SIGNAL) { |
1da177e4 | 601 | unsigned long irqflags; |
0a3e67a4 | 602 | struct list_head *vbl_sigs = &dev->vbl_sigs[crtc]; |
55910517 | 603 | struct drm_vbl_sig *vbl_sig; |
1da177e4 | 604 | |
b5e89ed5 | 605 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1da177e4 LT |
606 | |
607 | /* Check if this task has already scheduled the same signal | |
608 | * for the same vblank sequence number; nothing to be done in | |
609 | * that case | |
610 | */ | |
bd1b331f | 611 | list_for_each_entry(vbl_sig, vbl_sigs, head) { |
c153f45f EA |
612 | if (vbl_sig->sequence == vblwait->request.sequence |
613 | && vbl_sig->info.si_signo == | |
614 | vblwait->request.signal | |
b5e89ed5 DA |
615 | && vbl_sig->task == current) { |
616 | spin_unlock_irqrestore(&dev->vbl_lock, | |
617 | irqflags); | |
c153f45f | 618 | vblwait->reply.sequence = seq; |
1da177e4 LT |
619 | goto done; |
620 | } | |
621 | } | |
622 | ||
0a3e67a4 | 623 | if (atomic_read(&dev->vbl_signal_pending) >= 100) { |
b5e89ed5 | 624 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
625 | ret = -EBUSY; |
626 | goto done; | |
1da177e4 LT |
627 | } |
628 | ||
b5e89ed5 | 629 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1da177e4 | 630 | |
0a3e67a4 JB |
631 | vbl_sig = drm_calloc(1, sizeof(struct drm_vbl_sig), |
632 | DRM_MEM_DRIVER); | |
633 | if (!vbl_sig) { | |
634 | ret = -ENOMEM; | |
635 | goto done; | |
636 | } | |
637 | ||
35ad68c1 EA |
638 | /* Get a refcount on the vblank, which will be released by |
639 | * drm_vbl_send_signals(). | |
640 | */ | |
0a3e67a4 JB |
641 | ret = drm_vblank_get(dev, crtc); |
642 | if (ret) { | |
643 | drm_free(vbl_sig, sizeof(struct drm_vbl_sig), | |
644 | DRM_MEM_DRIVER); | |
35ad68c1 | 645 | goto done; |
1da177e4 LT |
646 | } |
647 | ||
0a3e67a4 | 648 | atomic_inc(&dev->vbl_signal_pending); |
1da177e4 | 649 | |
c153f45f EA |
650 | vbl_sig->sequence = vblwait->request.sequence; |
651 | vbl_sig->info.si_signo = vblwait->request.signal; | |
1da177e4 LT |
652 | vbl_sig->task = current; |
653 | ||
b5e89ed5 | 654 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1da177e4 | 655 | |
bd1b331f | 656 | list_add_tail(&vbl_sig->head, vbl_sigs); |
1da177e4 | 657 | |
b5e89ed5 | 658 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
049b3233 | 659 | |
c153f45f | 660 | vblwait->reply.sequence = seq; |
1da177e4 | 661 | } else { |
0a3e67a4 JB |
662 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
663 | vblwait->request.sequence, crtc); | |
fede5c91 | 664 | dev->last_vblank_wait[crtc] = vblwait->request.sequence; |
0a3e67a4 | 665 | DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ, |
dc1336ff JB |
666 | (((drm_vblank_count(dev, crtc) - |
667 | vblwait->request.sequence) <= (1 << 23)) || | |
668 | !dev->irq_enabled)); | |
0a3e67a4 JB |
669 | |
670 | if (ret != -EINTR) { | |
671 | struct timeval now; | |
672 | ||
673 | do_gettimeofday(&now); | |
674 | ||
675 | vblwait->reply.tval_sec = now.tv_sec; | |
676 | vblwait->reply.tval_usec = now.tv_usec; | |
677 | vblwait->reply.sequence = drm_vblank_count(dev, crtc); | |
678 | DRM_DEBUG("returning %d to client\n", | |
679 | vblwait->reply.sequence); | |
680 | } else { | |
681 | DRM_DEBUG("vblank wait interrupted by signal\n"); | |
682 | } | |
1da177e4 LT |
683 | } |
684 | ||
0a3e67a4 JB |
685 | done: |
686 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
687 | return ret; |
688 | } | |
689 | ||
690 | /** | |
691 | * Send the VBLANK signals. | |
692 | * | |
693 | * \param dev DRM device. | |
0a3e67a4 | 694 | * \param crtc CRTC where the vblank event occurred |
1da177e4 LT |
695 | * |
696 | * Sends a signal for each task in drm_device::vbl_sigs and empties the list. | |
697 | * | |
698 | * If a signal is not requested, then calls vblank_wait(). | |
699 | */ | |
0a3e67a4 | 700 | static void drm_vbl_send_signals(struct drm_device *dev, int crtc) |
1da177e4 | 701 | { |
0a3e67a4 JB |
702 | struct drm_vbl_sig *vbl_sig, *tmp; |
703 | struct list_head *vbl_sigs; | |
704 | unsigned int vbl_seq; | |
1da177e4 LT |
705 | unsigned long flags; |
706 | ||
b5e89ed5 | 707 | spin_lock_irqsave(&dev->vbl_lock, flags); |
1da177e4 | 708 | |
0a3e67a4 JB |
709 | vbl_sigs = &dev->vbl_sigs[crtc]; |
710 | vbl_seq = drm_vblank_count(dev, crtc); | |
1da177e4 | 711 | |
0a3e67a4 JB |
712 | list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) { |
713 | if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) { | |
714 | vbl_sig->info.si_code = vbl_seq; | |
715 | send_sig_info(vbl_sig->info.si_signo, | |
716 | &vbl_sig->info, vbl_sig->task); | |
1da177e4 | 717 | |
0a3e67a4 | 718 | list_del(&vbl_sig->head); |
af6061af | 719 | |
0a3e67a4 JB |
720 | drm_free(vbl_sig, sizeof(*vbl_sig), |
721 | DRM_MEM_DRIVER); | |
722 | atomic_dec(&dev->vbl_signal_pending); | |
723 | drm_vblank_put(dev, crtc); | |
724 | } | |
1da177e4 LT |
725 | } |
726 | ||
b5e89ed5 | 727 | spin_unlock_irqrestore(&dev->vbl_lock, flags); |
1da177e4 | 728 | } |
1da177e4 | 729 | |
0a3e67a4 JB |
730 | /** |
731 | * drm_handle_vblank - handle a vblank event | |
732 | * @dev: DRM device | |
733 | * @crtc: where this event occurred | |
734 | * | |
735 | * Drivers should call this routine in their vblank interrupt handlers to | |
736 | * update the vblank counter and send any signals that may be pending. | |
737 | */ | |
738 | void drm_handle_vblank(struct drm_device *dev, int crtc) | |
739 | { | |
740 | atomic_inc(&dev->_vblank_count[crtc]); | |
741 | DRM_WAKEUP(&dev->vbl_queue[crtc]); | |
742 | drm_vbl_send_signals(dev, crtc); | |
743 | } | |
744 | EXPORT_SYMBOL(drm_handle_vblank); |