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 | ||
28d52043 | 40 | #include <linux/vgaarb.h> |
1da177e4 LT |
41 | /** |
42 | * Get interrupt from bus id. | |
b5e89ed5 | 43 | * |
1da177e4 | 44 | * \param inode device inode. |
6c340eac | 45 | * \param file_priv DRM file private. |
1da177e4 LT |
46 | * \param cmd command. |
47 | * \param arg user argument, pointing to a drm_irq_busid structure. | |
48 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 49 | * |
1da177e4 LT |
50 | * Finds the PCI device with the specified bus id and gets its IRQ number. |
51 | * This IOCTL is deprecated, and will now return EINVAL for any busid not equal | |
52 | * to that of the device that this DRM instance attached to. | |
53 | */ | |
c153f45f EA |
54 | int drm_irq_by_busid(struct drm_device *dev, void *data, |
55 | struct drm_file *file_priv) | |
1da177e4 | 56 | { |
c153f45f | 57 | struct drm_irq_busid *p = data; |
1da177e4 LT |
58 | |
59 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
60 | return -EINVAL; | |
61 | ||
c153f45f EA |
62 | if ((p->busnum >> 8) != drm_get_pci_domain(dev) || |
63 | (p->busnum & 0xff) != dev->pdev->bus->number || | |
64 | p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) | |
1da177e4 LT |
65 | return -EINVAL; |
66 | ||
ed4cb414 | 67 | p->irq = dev->pdev->irq; |
c153f45f EA |
68 | |
69 | DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, | |
70 | p->irq); | |
1da177e4 | 71 | |
1da177e4 LT |
72 | return 0; |
73 | } | |
74 | ||
0a3e67a4 JB |
75 | static void vblank_disable_fn(unsigned long arg) |
76 | { | |
77 | struct drm_device *dev = (struct drm_device *)arg; | |
78 | unsigned long irqflags; | |
79 | int i; | |
80 | ||
81 | if (!dev->vblank_disable_allowed) | |
82 | return; | |
83 | ||
84 | for (i = 0; i < dev->num_crtcs; i++) { | |
85 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
86 | if (atomic_read(&dev->vblank_refcount[i]) == 0 && | |
87 | dev->vblank_enabled[i]) { | |
88 | DRM_DEBUG("disabling vblank on crtc %d\n", i); | |
89 | dev->last_vblank[i] = | |
90 | dev->driver->get_vblank_counter(dev, i); | |
91 | dev->driver->disable_vblank(dev, i); | |
92 | dev->vblank_enabled[i] = 0; | |
93 | } | |
94 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
95 | } | |
96 | } | |
97 | ||
52440211 | 98 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 JB |
99 | { |
100 | /* Bail if the driver didn't call drm_vblank_init() */ | |
101 | if (dev->num_crtcs == 0) | |
102 | return; | |
103 | ||
104 | del_timer(&dev->vblank_disable_timer); | |
105 | ||
106 | vblank_disable_fn((unsigned long)dev); | |
107 | ||
9a298b2a EA |
108 | kfree(dev->vbl_queue); |
109 | kfree(dev->_vblank_count); | |
110 | kfree(dev->vblank_refcount); | |
111 | kfree(dev->vblank_enabled); | |
112 | kfree(dev->last_vblank); | |
113 | kfree(dev->last_vblank_wait); | |
114 | kfree(dev->vblank_inmodeset); | |
0a3e67a4 JB |
115 | |
116 | dev->num_crtcs = 0; | |
117 | } | |
118 | ||
119 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) | |
120 | { | |
121 | int i, ret = -ENOMEM; | |
122 | ||
123 | setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, | |
124 | (unsigned long)dev); | |
125 | spin_lock_init(&dev->vbl_lock); | |
0a3e67a4 JB |
126 | dev->num_crtcs = num_crtcs; |
127 | ||
9a298b2a EA |
128 | dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs, |
129 | GFP_KERNEL); | |
0a3e67a4 JB |
130 | if (!dev->vbl_queue) |
131 | goto err; | |
132 | ||
9a298b2a | 133 | dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL); |
0a3e67a4 JB |
134 | if (!dev->_vblank_count) |
135 | goto err; | |
136 | ||
9a298b2a EA |
137 | dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs, |
138 | GFP_KERNEL); | |
0a3e67a4 JB |
139 | if (!dev->vblank_refcount) |
140 | goto err; | |
141 | ||
9a298b2a | 142 | dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
143 | if (!dev->vblank_enabled) |
144 | goto err; | |
145 | ||
9a298b2a | 146 | dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
0a3e67a4 JB |
147 | if (!dev->last_vblank) |
148 | goto err; | |
149 | ||
9a298b2a | 150 | dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
fede5c91 EA |
151 | if (!dev->last_vblank_wait) |
152 | goto err; | |
153 | ||
9a298b2a | 154 | dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
155 | if (!dev->vblank_inmodeset) |
156 | goto err; | |
157 | ||
158 | /* Zero per-crtc vblank stuff */ | |
159 | for (i = 0; i < num_crtcs; i++) { | |
160 | init_waitqueue_head(&dev->vbl_queue[i]); | |
0a3e67a4 JB |
161 | atomic_set(&dev->_vblank_count[i], 0); |
162 | atomic_set(&dev->vblank_refcount[i], 0); | |
163 | } | |
164 | ||
165 | dev->vblank_disable_allowed = 0; | |
166 | ||
167 | return 0; | |
168 | ||
169 | err: | |
170 | drm_vblank_cleanup(dev); | |
171 | return ret; | |
172 | } | |
173 | EXPORT_SYMBOL(drm_vblank_init); | |
174 | ||
28d52043 DA |
175 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
176 | { | |
177 | struct drm_device *dev = cookie; | |
178 | ||
179 | if (dev->driver->vgaarb_irq) { | |
180 | dev->driver->vgaarb_irq(dev, state); | |
181 | return; | |
182 | } | |
183 | ||
184 | if (!dev->irq_enabled) | |
185 | return; | |
186 | ||
187 | if (state) | |
188 | dev->driver->irq_uninstall(dev); | |
189 | else { | |
190 | dev->driver->irq_preinstall(dev); | |
191 | dev->driver->irq_postinstall(dev); | |
192 | } | |
193 | } | |
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; |
b8da7de5 | 208 | char *irqname; |
1da177e4 LT |
209 | |
210 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
211 | return -EINVAL; | |
212 | ||
ed4cb414 | 213 | if (dev->pdev->irq == 0) |
1da177e4 LT |
214 | return -EINVAL; |
215 | ||
30e2fb18 | 216 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
217 | |
218 | /* Driver must have been initialized */ | |
b5e89ed5 | 219 | if (!dev->dev_private) { |
30e2fb18 | 220 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
221 | return -EINVAL; |
222 | } | |
223 | ||
b5e89ed5 | 224 | if (dev->irq_enabled) { |
30e2fb18 | 225 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
226 | return -EBUSY; |
227 | } | |
228 | dev->irq_enabled = 1; | |
30e2fb18 | 229 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 230 | |
ed4cb414 | 231 | DRM_DEBUG("irq=%d\n", dev->pdev->irq); |
1da177e4 | 232 | |
b5e89ed5 | 233 | /* Before installing handler */ |
1da177e4 LT |
234 | dev->driver->irq_preinstall(dev); |
235 | ||
b5e89ed5 | 236 | /* Install handler */ |
1da177e4 | 237 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 238 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 239 | |
b8da7de5 DA |
240 | if (dev->devname) |
241 | irqname = dev->devname; | |
242 | else | |
243 | irqname = dev->driver->name; | |
244 | ||
9bfbd5cb | 245 | ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, |
b8da7de5 | 246 | sh_flags, irqname, dev); |
9bfbd5cb | 247 | |
b5e89ed5 | 248 | if (ret < 0) { |
30e2fb18 | 249 | mutex_lock(&dev->struct_mutex); |
1da177e4 | 250 | dev->irq_enabled = 0; |
30e2fb18 | 251 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
252 | return ret; |
253 | } | |
254 | ||
28d52043 DA |
255 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
256 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
257 | ||
b5e89ed5 | 258 | /* After installing handler */ |
0a3e67a4 JB |
259 | ret = dev->driver->irq_postinstall(dev); |
260 | if (ret < 0) { | |
261 | mutex_lock(&dev->struct_mutex); | |
262 | dev->irq_enabled = 0; | |
263 | mutex_unlock(&dev->struct_mutex); | |
264 | } | |
1da177e4 | 265 | |
0a3e67a4 | 266 | return ret; |
1da177e4 | 267 | } |
0a3e67a4 | 268 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
269 | |
270 | /** | |
271 | * Uninstall the IRQ handler. | |
272 | * | |
273 | * \param dev DRM device. | |
274 | * | |
275 | * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq. | |
276 | */ | |
84b1fd10 | 277 | int drm_irq_uninstall(struct drm_device * dev) |
1da177e4 | 278 | { |
dc1336ff JB |
279 | unsigned long irqflags; |
280 | int irq_enabled, i; | |
1da177e4 LT |
281 | |
282 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
283 | return -EINVAL; | |
284 | ||
30e2fb18 | 285 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
286 | irq_enabled = dev->irq_enabled; |
287 | dev->irq_enabled = 0; | |
30e2fb18 | 288 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 289 | |
dc1336ff JB |
290 | /* |
291 | * Wake up any waiters so they don't hang. | |
292 | */ | |
293 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
294 | for (i = 0; i < dev->num_crtcs; i++) { | |
295 | DRM_WAKEUP(&dev->vbl_queue[i]); | |
296 | dev->vblank_enabled[i] = 0; | |
14d200c5 | 297 | dev->last_vblank[i] = dev->driver->get_vblank_counter(dev, i); |
dc1336ff JB |
298 | } |
299 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
300 | ||
b5e89ed5 | 301 | if (!irq_enabled) |
1da177e4 LT |
302 | return -EINVAL; |
303 | ||
ed4cb414 | 304 | DRM_DEBUG("irq=%d\n", dev->pdev->irq); |
1da177e4 | 305 | |
28d52043 DA |
306 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
307 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
308 | ||
1da177e4 LT |
309 | dev->driver->irq_uninstall(dev); |
310 | ||
ed4cb414 | 311 | free_irq(dev->pdev->irq, dev); |
1da177e4 LT |
312 | |
313 | return 0; | |
314 | } | |
315 | EXPORT_SYMBOL(drm_irq_uninstall); | |
316 | ||
317 | /** | |
318 | * IRQ control ioctl. | |
319 | * | |
320 | * \param inode device inode. | |
6c340eac | 321 | * \param file_priv DRM file private. |
1da177e4 LT |
322 | * \param cmd command. |
323 | * \param arg user argument, pointing to a drm_control structure. | |
324 | * \return zero on success or a negative number on failure. | |
325 | * | |
326 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
327 | */ | |
c153f45f EA |
328 | int drm_control(struct drm_device *dev, void *data, |
329 | struct drm_file *file_priv) | |
1da177e4 | 330 | { |
c153f45f | 331 | struct drm_control *ctl = data; |
b5e89ed5 | 332 | |
1da177e4 LT |
333 | /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */ |
334 | ||
1da177e4 | 335 | |
c153f45f | 336 | switch (ctl->func) { |
1da177e4 LT |
337 | case DRM_INST_HANDLER: |
338 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
339 | return 0; | |
f453ba04 DA |
340 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
341 | return 0; | |
1da177e4 | 342 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
ed4cb414 | 343 | ctl->irq != dev->pdev->irq) |
1da177e4 | 344 | return -EINVAL; |
b5e89ed5 | 345 | return drm_irq_install(dev); |
1da177e4 LT |
346 | case DRM_UNINST_HANDLER: |
347 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
348 | return 0; | |
f453ba04 DA |
349 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
350 | return 0; | |
b5e89ed5 | 351 | return drm_irq_uninstall(dev); |
1da177e4 LT |
352 | default: |
353 | return -EINVAL; | |
354 | } | |
355 | } | |
356 | ||
0a3e67a4 JB |
357 | /** |
358 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
359 | * @dev: DRM device | |
360 | * @crtc: which counter to retrieve | |
361 | * | |
362 | * Fetches the "cooked" vblank count value that represents the number of | |
363 | * vblank events since the system was booted, including lost events due to | |
364 | * modesetting activity. | |
365 | */ | |
366 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
367 | { | |
368 | return atomic_read(&dev->_vblank_count[crtc]); | |
369 | } | |
370 | EXPORT_SYMBOL(drm_vblank_count); | |
371 | ||
372 | /** | |
373 | * drm_update_vblank_count - update the master vblank counter | |
374 | * @dev: DRM device | |
375 | * @crtc: counter to update | |
376 | * | |
377 | * Call back into the driver to update the appropriate vblank counter | |
378 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
379 | * update the last read value so we can deal with wraparound on the next | |
380 | * call if necessary. | |
381 | * | |
382 | * Only necessary when going from off->on, to account for frames we | |
383 | * didn't get an interrupt for. | |
384 | * | |
385 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
386 | * device vblank fields. | |
387 | */ | |
388 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
389 | { | |
390 | u32 cur_vblank, diff; | |
391 | ||
392 | /* | |
393 | * Interrupts were disabled prior to this call, so deal with counter | |
394 | * wrap if needed. | |
395 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
396 | * here if the register is small or we had vblank interrupts off for | |
397 | * a long time. | |
398 | */ | |
399 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
400 | diff = cur_vblank - dev->last_vblank[crtc]; | |
401 | if (cur_vblank < dev->last_vblank[crtc]) { | |
402 | diff += dev->max_vblank_count; | |
403 | ||
404 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
405 | crtc, dev->last_vblank[crtc], cur_vblank, diff); | |
406 | } | |
407 | ||
408 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", | |
409 | crtc, diff); | |
410 | ||
411 | atomic_add(diff, &dev->_vblank_count[crtc]); | |
412 | } | |
413 | ||
414 | /** | |
415 | * drm_vblank_get - get a reference count on vblank events | |
416 | * @dev: DRM device | |
417 | * @crtc: which CRTC to own | |
418 | * | |
419 | * Acquire a reference count on vblank events to avoid having them disabled | |
420 | * while in use. | |
421 | * | |
422 | * RETURNS | |
423 | * Zero on success, nonzero on failure. | |
424 | */ | |
425 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
426 | { | |
427 | unsigned long irqflags; | |
428 | int ret = 0; | |
429 | ||
430 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
431 | /* Going from 0->1 means we have to enable interrupts again */ | |
432 | if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1 && | |
433 | !dev->vblank_enabled[crtc]) { | |
434 | ret = dev->driver->enable_vblank(dev, crtc); | |
435 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); | |
436 | if (ret) | |
437 | atomic_dec(&dev->vblank_refcount[crtc]); | |
438 | else { | |
439 | dev->vblank_enabled[crtc] = 1; | |
440 | drm_update_vblank_count(dev, crtc); | |
441 | } | |
442 | } | |
443 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
444 | ||
445 | return ret; | |
446 | } | |
447 | EXPORT_SYMBOL(drm_vblank_get); | |
448 | ||
449 | /** | |
450 | * drm_vblank_put - give up ownership of vblank events | |
451 | * @dev: DRM device | |
452 | * @crtc: which counter to give up | |
453 | * | |
454 | * Release ownership of a given vblank counter, turning off interrupts | |
455 | * if possible. | |
456 | */ | |
457 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
458 | { | |
b3f5e732 CW |
459 | BUG_ON (atomic_read (&dev->vblank_refcount[crtc]) == 0); |
460 | ||
0a3e67a4 JB |
461 | /* Last user schedules interrupt disable */ |
462 | if (atomic_dec_and_test(&dev->vblank_refcount[crtc])) | |
463 | mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ); | |
464 | } | |
465 | EXPORT_SYMBOL(drm_vblank_put); | |
466 | ||
f453ba04 DA |
467 | /** |
468 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
469 | * @dev: DRM device | |
470 | * @crtc: CRTC in question | |
471 | * @post: post or pre mode set? | |
472 | * | |
473 | * Account for vblank events across mode setting events, which will likely | |
474 | * reset the hardware frame counter. | |
475 | */ | |
476 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
477 | { | |
478 | /* | |
479 | * To avoid all the problems that might happen if interrupts | |
480 | * were enabled/disabled around or between these calls, we just | |
481 | * have the kernel take a reference on the CRTC (just once though | |
482 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
483 | * so that interrupts remain enabled in the interim. | |
484 | */ | |
485 | if (!dev->vblank_inmodeset[crtc]) { | |
b3f5e732 CW |
486 | dev->vblank_inmodeset[crtc] = 0x1; |
487 | if (drm_vblank_get(dev, crtc) == 0) | |
488 | dev->vblank_inmodeset[crtc] |= 0x2; | |
f453ba04 DA |
489 | } |
490 | } | |
491 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
492 | ||
493 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) | |
494 | { | |
495 | unsigned long irqflags; | |
496 | ||
497 | if (dev->vblank_inmodeset[crtc]) { | |
498 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
499 | dev->vblank_disable_allowed = 1; | |
f453ba04 | 500 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 CW |
501 | |
502 | if (dev->vblank_inmodeset[crtc] & 0x2) | |
503 | drm_vblank_put(dev, crtc); | |
504 | ||
505 | dev->vblank_inmodeset[crtc] = 0; | |
f453ba04 DA |
506 | } |
507 | } | |
508 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
509 | ||
0a3e67a4 JB |
510 | /** |
511 | * drm_modeset_ctl - handle vblank event counter changes across mode switch | |
512 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
513 | * | |
514 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
515 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
516 | * | |
517 | * Generally the counter will reset across mode sets. If interrupts are | |
518 | * enabled around this call, we don't have to do anything since the counter | |
519 | * will have already been incremented. | |
520 | */ | |
521 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
522 | struct drm_file *file_priv) | |
523 | { | |
524 | struct drm_modeset_ctl *modeset = data; | |
0a3e67a4 JB |
525 | int crtc, ret = 0; |
526 | ||
527 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
528 | if (!dev->num_crtcs) | |
529 | goto out; | |
530 | ||
531 | crtc = modeset->crtc; | |
532 | if (crtc >= dev->num_crtcs) { | |
533 | ret = -EINVAL; | |
534 | goto out; | |
535 | } | |
536 | ||
0a3e67a4 JB |
537 | switch (modeset->cmd) { |
538 | case _DRM_PRE_MODESET: | |
f453ba04 | 539 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
540 | break; |
541 | case _DRM_POST_MODESET: | |
f453ba04 | 542 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
543 | break; |
544 | default: | |
545 | ret = -EINVAL; | |
546 | break; | |
547 | } | |
548 | ||
549 | out: | |
550 | return ret; | |
551 | } | |
552 | ||
c9a9c5e0 KH |
553 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
554 | union drm_wait_vblank *vblwait, | |
555 | struct drm_file *file_priv) | |
556 | { | |
557 | struct drm_pending_vblank_event *e; | |
558 | struct timeval now; | |
559 | unsigned long flags; | |
560 | unsigned int seq; | |
561 | ||
562 | e = kzalloc(sizeof *e, GFP_KERNEL); | |
563 | if (e == NULL) | |
564 | return -ENOMEM; | |
565 | ||
566 | e->pipe = pipe; | |
567 | e->event.base.type = DRM_EVENT_VBLANK; | |
568 | e->event.base.length = sizeof e->event; | |
569 | e->event.user_data = vblwait->request.signal; | |
570 | e->base.event = &e->event.base; | |
571 | e->base.file_priv = file_priv; | |
572 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
573 | ||
574 | do_gettimeofday(&now); | |
575 | spin_lock_irqsave(&dev->event_lock, flags); | |
576 | ||
577 | if (file_priv->event_space < sizeof e->event) { | |
578 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
579 | kfree(e); | |
580 | return -ENOMEM; | |
581 | } | |
582 | ||
583 | file_priv->event_space -= sizeof e->event; | |
584 | seq = drm_vblank_count(dev, pipe); | |
585 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && | |
586 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
587 | vblwait->request.sequence = seq + 1; | |
4a921645 | 588 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
589 | } |
590 | ||
591 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
592 | vblwait->request.sequence, seq, pipe); | |
593 | ||
594 | e->event.sequence = vblwait->request.sequence; | |
595 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
596 | e->event.tv_sec = now.tv_sec; | |
597 | e->event.tv_usec = now.tv_usec; | |
598 | drm_vblank_put(dev, e->pipe); | |
599 | list_add_tail(&e->base.link, &e->base.file_priv->event_list); | |
600 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
601 | } else { | |
602 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
603 | } | |
604 | ||
605 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
1da177e4 LT |
610 | /** |
611 | * Wait for VBLANK. | |
612 | * | |
613 | * \param inode device inode. | |
6c340eac | 614 | * \param file_priv DRM file private. |
1da177e4 LT |
615 | * \param cmd command. |
616 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
617 | * \return zero on success or a negative number on failure. | |
618 | * | |
30b23634 EA |
619 | * This function enables the vblank interrupt on the pipe requested, then |
620 | * sleeps waiting for the requested sequence number to occur, and drops | |
621 | * the vblank interrupt refcount afterwards. (vblank irq disable follows that | |
622 | * after a timeout with no further vblank waits scheduled). | |
1da177e4 | 623 | */ |
0a3e67a4 JB |
624 | int drm_wait_vblank(struct drm_device *dev, void *data, |
625 | struct drm_file *file_priv) | |
1da177e4 | 626 | { |
c153f45f | 627 | union drm_wait_vblank *vblwait = data; |
1da177e4 | 628 | int ret = 0; |
0a3e67a4 | 629 | unsigned int flags, seq, crtc; |
1da177e4 | 630 | |
ed4cb414 | 631 | if ((!dev->pdev->irq) || (!dev->irq_enabled)) |
1da177e4 LT |
632 | return -EINVAL; |
633 | ||
30b23634 EA |
634 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
635 | return -EINVAL; | |
636 | ||
c153f45f | 637 | if (vblwait->request.type & |
776c9443 MCA |
638 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) { |
639 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", | |
c153f45f | 640 | vblwait->request.type, |
776c9443 MCA |
641 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)); |
642 | return -EINVAL; | |
643 | } | |
644 | ||
c153f45f | 645 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
0a3e67a4 | 646 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
776c9443 | 647 | |
0a3e67a4 | 648 | if (crtc >= dev->num_crtcs) |
776c9443 MCA |
649 | return -EINVAL; |
650 | ||
0a3e67a4 JB |
651 | ret = drm_vblank_get(dev, crtc); |
652 | if (ret) { | |
8d3457ec | 653 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
654 | return ret; |
655 | } | |
656 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 657 | |
c153f45f | 658 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 659 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
660 | vblwait->request.sequence += seq; |
661 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
662 | case _DRM_VBLANK_ABSOLUTE: |
663 | break; | |
664 | default: | |
0a3e67a4 JB |
665 | ret = -EINVAL; |
666 | goto done; | |
1da177e4 LT |
667 | } |
668 | ||
c9a9c5e0 KH |
669 | if (flags & _DRM_VBLANK_EVENT) |
670 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); | |
671 | ||
ab285d74 | 672 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
673 | (seq - vblwait->request.sequence) <= (1<<23)) { |
674 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
675 | } |
676 | ||
30b23634 EA |
677 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
678 | vblwait->request.sequence, crtc); | |
679 | dev->last_vblank_wait[crtc] = vblwait->request.sequence; | |
680 | DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ, | |
681 | (((drm_vblank_count(dev, crtc) - | |
682 | vblwait->request.sequence) <= (1 << 23)) || | |
683 | !dev->irq_enabled)); | |
1da177e4 | 684 | |
30b23634 EA |
685 | if (ret != -EINTR) { |
686 | struct timeval now; | |
1da177e4 | 687 | |
30b23634 | 688 | do_gettimeofday(&now); |
049b3233 | 689 | |
30b23634 EA |
690 | vblwait->reply.tval_sec = now.tv_sec; |
691 | vblwait->reply.tval_usec = now.tv_usec; | |
692 | vblwait->reply.sequence = drm_vblank_count(dev, crtc); | |
693 | DRM_DEBUG("returning %d to client\n", | |
694 | vblwait->reply.sequence); | |
1da177e4 | 695 | } else { |
30b23634 | 696 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
697 | } |
698 | ||
0a3e67a4 JB |
699 | done: |
700 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
701 | return ret; |
702 | } | |
703 | ||
c9a9c5e0 KH |
704 | void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
705 | { | |
706 | struct drm_pending_vblank_event *e, *t; | |
707 | struct timeval now; | |
708 | unsigned long flags; | |
709 | unsigned int seq; | |
710 | ||
711 | do_gettimeofday(&now); | |
712 | seq = drm_vblank_count(dev, crtc); | |
713 | ||
714 | spin_lock_irqsave(&dev->event_lock, flags); | |
715 | ||
716 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
717 | if (e->pipe != crtc) | |
718 | continue; | |
719 | if ((seq - e->event.sequence) > (1<<23)) | |
720 | continue; | |
721 | ||
722 | DRM_DEBUG("vblank event on %d, current %d\n", | |
723 | e->event.sequence, seq); | |
724 | ||
725 | e->event.sequence = seq; | |
726 | e->event.tv_sec = now.tv_sec; | |
727 | e->event.tv_usec = now.tv_usec; | |
728 | drm_vblank_put(dev, e->pipe); | |
729 | list_move_tail(&e->base.link, &e->base.file_priv->event_list); | |
730 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
731 | } | |
732 | ||
733 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
734 | } | |
735 | ||
0a3e67a4 JB |
736 | /** |
737 | * drm_handle_vblank - handle a vblank event | |
738 | * @dev: DRM device | |
739 | * @crtc: where this event occurred | |
740 | * | |
741 | * Drivers should call this routine in their vblank interrupt handlers to | |
742 | * update the vblank counter and send any signals that may be pending. | |
743 | */ | |
744 | void drm_handle_vblank(struct drm_device *dev, int crtc) | |
745 | { | |
c9a9c5e0 KH |
746 | if (!dev->num_crtcs) |
747 | return; | |
748 | ||
0a3e67a4 JB |
749 | atomic_inc(&dev->_vblank_count[crtc]); |
750 | DRM_WAKEUP(&dev->vbl_queue[crtc]); | |
c9a9c5e0 | 751 | drm_handle_vblank_events(dev, crtc); |
0a3e67a4 JB |
752 | } |
753 | EXPORT_SYMBOL(drm_handle_vblank); |