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" | |
ac2874b9 | 37 | #include "drm_trace.h" |
1da177e4 LT |
38 | |
39 | #include <linux/interrupt.h> /* For task queue support */ | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 | 41 | |
28d52043 | 42 | #include <linux/vgaarb.h> |
1da177e4 LT |
43 | /** |
44 | * Get interrupt from bus id. | |
b5e89ed5 | 45 | * |
1da177e4 | 46 | * \param inode device inode. |
6c340eac | 47 | * \param file_priv DRM file private. |
1da177e4 LT |
48 | * \param cmd command. |
49 | * \param arg user argument, pointing to a drm_irq_busid structure. | |
50 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 51 | * |
1da177e4 LT |
52 | * Finds the PCI device with the specified bus id and gets its IRQ number. |
53 | * This IOCTL is deprecated, and will now return EINVAL for any busid not equal | |
54 | * to that of the device that this DRM instance attached to. | |
55 | */ | |
c153f45f EA |
56 | int drm_irq_by_busid(struct drm_device *dev, void *data, |
57 | struct drm_file *file_priv) | |
1da177e4 | 58 | { |
c153f45f | 59 | struct drm_irq_busid *p = data; |
1da177e4 | 60 | |
dcdb1674 JC |
61 | if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE)) |
62 | return -EINVAL; | |
63 | ||
1da177e4 LT |
64 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
65 | return -EINVAL; | |
66 | ||
c153f45f EA |
67 | if ((p->busnum >> 8) != drm_get_pci_domain(dev) || |
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 | ||
ed4cb414 | 72 | p->irq = dev->pdev->irq; |
c153f45f EA |
73 | |
74 | DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, | |
75 | p->irq); | |
1da177e4 | 76 | |
1da177e4 LT |
77 | return 0; |
78 | } | |
79 | ||
0a3e67a4 JB |
80 | static void vblank_disable_fn(unsigned long arg) |
81 | { | |
82 | struct drm_device *dev = (struct drm_device *)arg; | |
83 | unsigned long irqflags; | |
84 | int i; | |
85 | ||
86 | if (!dev->vblank_disable_allowed) | |
87 | return; | |
88 | ||
89 | for (i = 0; i < dev->num_crtcs; i++) { | |
90 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
91 | if (atomic_read(&dev->vblank_refcount[i]) == 0 && | |
92 | dev->vblank_enabled[i]) { | |
93 | DRM_DEBUG("disabling vblank on crtc %d\n", i); | |
94 | dev->last_vblank[i] = | |
95 | dev->driver->get_vblank_counter(dev, i); | |
96 | dev->driver->disable_vblank(dev, i); | |
97 | dev->vblank_enabled[i] = 0; | |
98 | } | |
99 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
100 | } | |
101 | } | |
102 | ||
52440211 | 103 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 JB |
104 | { |
105 | /* Bail if the driver didn't call drm_vblank_init() */ | |
106 | if (dev->num_crtcs == 0) | |
107 | return; | |
108 | ||
109 | del_timer(&dev->vblank_disable_timer); | |
110 | ||
111 | vblank_disable_fn((unsigned long)dev); | |
112 | ||
9a298b2a EA |
113 | kfree(dev->vbl_queue); |
114 | kfree(dev->_vblank_count); | |
115 | kfree(dev->vblank_refcount); | |
116 | kfree(dev->vblank_enabled); | |
117 | kfree(dev->last_vblank); | |
118 | kfree(dev->last_vblank_wait); | |
119 | kfree(dev->vblank_inmodeset); | |
0a3e67a4 JB |
120 | |
121 | dev->num_crtcs = 0; | |
122 | } | |
e77cef9c | 123 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 JB |
124 | |
125 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) | |
126 | { | |
127 | int i, ret = -ENOMEM; | |
128 | ||
129 | setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, | |
130 | (unsigned long)dev); | |
131 | spin_lock_init(&dev->vbl_lock); | |
0a3e67a4 JB |
132 | dev->num_crtcs = num_crtcs; |
133 | ||
9a298b2a EA |
134 | dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs, |
135 | GFP_KERNEL); | |
0a3e67a4 JB |
136 | if (!dev->vbl_queue) |
137 | goto err; | |
138 | ||
9a298b2a | 139 | dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL); |
0a3e67a4 JB |
140 | if (!dev->_vblank_count) |
141 | goto err; | |
142 | ||
9a298b2a EA |
143 | dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs, |
144 | GFP_KERNEL); | |
0a3e67a4 JB |
145 | if (!dev->vblank_refcount) |
146 | goto err; | |
147 | ||
9a298b2a | 148 | dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
149 | if (!dev->vblank_enabled) |
150 | goto err; | |
151 | ||
9a298b2a | 152 | dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
0a3e67a4 JB |
153 | if (!dev->last_vblank) |
154 | goto err; | |
155 | ||
9a298b2a | 156 | dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
fede5c91 EA |
157 | if (!dev->last_vblank_wait) |
158 | goto err; | |
159 | ||
9a298b2a | 160 | dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
161 | if (!dev->vblank_inmodeset) |
162 | goto err; | |
163 | ||
164 | /* Zero per-crtc vblank stuff */ | |
165 | for (i = 0; i < num_crtcs; i++) { | |
166 | init_waitqueue_head(&dev->vbl_queue[i]); | |
0a3e67a4 JB |
167 | atomic_set(&dev->_vblank_count[i], 0); |
168 | atomic_set(&dev->vblank_refcount[i], 0); | |
169 | } | |
170 | ||
171 | dev->vblank_disable_allowed = 0; | |
0a3e67a4 JB |
172 | return 0; |
173 | ||
174 | err: | |
175 | drm_vblank_cleanup(dev); | |
176 | return ret; | |
177 | } | |
178 | EXPORT_SYMBOL(drm_vblank_init); | |
179 | ||
28d52043 DA |
180 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
181 | { | |
182 | struct drm_device *dev = cookie; | |
183 | ||
184 | if (dev->driver->vgaarb_irq) { | |
185 | dev->driver->vgaarb_irq(dev, state); | |
186 | return; | |
187 | } | |
188 | ||
189 | if (!dev->irq_enabled) | |
190 | return; | |
191 | ||
192 | if (state) | |
193 | dev->driver->irq_uninstall(dev); | |
194 | else { | |
195 | dev->driver->irq_preinstall(dev); | |
196 | dev->driver->irq_postinstall(dev); | |
197 | } | |
198 | } | |
199 | ||
1da177e4 LT |
200 | /** |
201 | * Install IRQ handler. | |
202 | * | |
203 | * \param dev DRM device. | |
1da177e4 | 204 | * |
0a3e67a4 | 205 | * Initializes the IRQ related data. Installs the handler, calling the driver |
1da177e4 LT |
206 | * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions |
207 | * before and after the installation. | |
208 | */ | |
0a3e67a4 | 209 | int drm_irq_install(struct drm_device *dev) |
1da177e4 | 210 | { |
0a3e67a4 | 211 | int ret = 0; |
b5e89ed5 | 212 | unsigned long sh_flags = 0; |
b8da7de5 | 213 | char *irqname; |
1da177e4 LT |
214 | |
215 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
216 | return -EINVAL; | |
217 | ||
dcdb1674 | 218 | if (drm_dev_to_irq(dev) == 0) |
1da177e4 LT |
219 | return -EINVAL; |
220 | ||
30e2fb18 | 221 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
222 | |
223 | /* Driver must have been initialized */ | |
b5e89ed5 | 224 | if (!dev->dev_private) { |
30e2fb18 | 225 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
226 | return -EINVAL; |
227 | } | |
228 | ||
b5e89ed5 | 229 | if (dev->irq_enabled) { |
30e2fb18 | 230 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
231 | return -EBUSY; |
232 | } | |
233 | dev->irq_enabled = 1; | |
30e2fb18 | 234 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 235 | |
dcdb1674 | 236 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
1da177e4 | 237 | |
b5e89ed5 | 238 | /* Before installing handler */ |
1da177e4 LT |
239 | dev->driver->irq_preinstall(dev); |
240 | ||
b5e89ed5 | 241 | /* Install handler */ |
1da177e4 | 242 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 243 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 244 | |
b8da7de5 DA |
245 | if (dev->devname) |
246 | irqname = dev->devname; | |
247 | else | |
248 | irqname = dev->driver->name; | |
249 | ||
9bfbd5cb | 250 | ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, |
b8da7de5 | 251 | sh_flags, irqname, dev); |
9bfbd5cb | 252 | |
b5e89ed5 | 253 | if (ret < 0) { |
30e2fb18 | 254 | mutex_lock(&dev->struct_mutex); |
1da177e4 | 255 | dev->irq_enabled = 0; |
30e2fb18 | 256 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
257 | return ret; |
258 | } | |
259 | ||
28d52043 DA |
260 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
261 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
262 | ||
b5e89ed5 | 263 | /* After installing handler */ |
0a3e67a4 JB |
264 | ret = dev->driver->irq_postinstall(dev); |
265 | if (ret < 0) { | |
266 | mutex_lock(&dev->struct_mutex); | |
267 | dev->irq_enabled = 0; | |
268 | mutex_unlock(&dev->struct_mutex); | |
269 | } | |
1da177e4 | 270 | |
0a3e67a4 | 271 | return ret; |
1da177e4 | 272 | } |
0a3e67a4 | 273 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
274 | |
275 | /** | |
276 | * Uninstall the IRQ handler. | |
277 | * | |
278 | * \param dev DRM device. | |
279 | * | |
280 | * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq. | |
281 | */ | |
84b1fd10 | 282 | int drm_irq_uninstall(struct drm_device * dev) |
1da177e4 | 283 | { |
dc1336ff JB |
284 | unsigned long irqflags; |
285 | int irq_enabled, i; | |
1da177e4 LT |
286 | |
287 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
288 | return -EINVAL; | |
289 | ||
30e2fb18 | 290 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
291 | irq_enabled = dev->irq_enabled; |
292 | dev->irq_enabled = 0; | |
30e2fb18 | 293 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 294 | |
dc1336ff JB |
295 | /* |
296 | * Wake up any waiters so they don't hang. | |
297 | */ | |
298 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
299 | for (i = 0; i < dev->num_crtcs; i++) { | |
300 | DRM_WAKEUP(&dev->vbl_queue[i]); | |
301 | dev->vblank_enabled[i] = 0; | |
14d200c5 | 302 | dev->last_vblank[i] = dev->driver->get_vblank_counter(dev, i); |
dc1336ff JB |
303 | } |
304 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
305 | ||
b5e89ed5 | 306 | if (!irq_enabled) |
1da177e4 LT |
307 | return -EINVAL; |
308 | ||
dcdb1674 | 309 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
1da177e4 | 310 | |
28d52043 DA |
311 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
312 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
313 | ||
1da177e4 LT |
314 | dev->driver->irq_uninstall(dev); |
315 | ||
dcdb1674 | 316 | free_irq(drm_dev_to_irq(dev), dev); |
1da177e4 LT |
317 | |
318 | return 0; | |
319 | } | |
320 | EXPORT_SYMBOL(drm_irq_uninstall); | |
321 | ||
322 | /** | |
323 | * IRQ control ioctl. | |
324 | * | |
325 | * \param inode device inode. | |
6c340eac | 326 | * \param file_priv DRM file private. |
1da177e4 LT |
327 | * \param cmd command. |
328 | * \param arg user argument, pointing to a drm_control structure. | |
329 | * \return zero on success or a negative number on failure. | |
330 | * | |
331 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
332 | */ | |
c153f45f EA |
333 | int drm_control(struct drm_device *dev, void *data, |
334 | struct drm_file *file_priv) | |
1da177e4 | 335 | { |
c153f45f | 336 | struct drm_control *ctl = data; |
b5e89ed5 | 337 | |
1da177e4 LT |
338 | /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */ |
339 | ||
1da177e4 | 340 | |
c153f45f | 341 | switch (ctl->func) { |
1da177e4 LT |
342 | case DRM_INST_HANDLER: |
343 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
344 | return 0; | |
f453ba04 DA |
345 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
346 | return 0; | |
1da177e4 | 347 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
dcdb1674 | 348 | ctl->irq != drm_dev_to_irq(dev)) |
1da177e4 | 349 | return -EINVAL; |
b5e89ed5 | 350 | return drm_irq_install(dev); |
1da177e4 LT |
351 | case DRM_UNINST_HANDLER: |
352 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
353 | return 0; | |
f453ba04 DA |
354 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
355 | return 0; | |
b5e89ed5 | 356 | return drm_irq_uninstall(dev); |
1da177e4 LT |
357 | default: |
358 | return -EINVAL; | |
359 | } | |
360 | } | |
361 | ||
0a3e67a4 JB |
362 | /** |
363 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
364 | * @dev: DRM device | |
365 | * @crtc: which counter to retrieve | |
366 | * | |
367 | * Fetches the "cooked" vblank count value that represents the number of | |
368 | * vblank events since the system was booted, including lost events due to | |
369 | * modesetting activity. | |
370 | */ | |
371 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
372 | { | |
373 | return atomic_read(&dev->_vblank_count[crtc]); | |
374 | } | |
375 | EXPORT_SYMBOL(drm_vblank_count); | |
376 | ||
377 | /** | |
378 | * drm_update_vblank_count - update the master vblank counter | |
379 | * @dev: DRM device | |
380 | * @crtc: counter to update | |
381 | * | |
382 | * Call back into the driver to update the appropriate vblank counter | |
383 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
384 | * update the last read value so we can deal with wraparound on the next | |
385 | * call if necessary. | |
386 | * | |
387 | * Only necessary when going from off->on, to account for frames we | |
388 | * didn't get an interrupt for. | |
389 | * | |
390 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
391 | * device vblank fields. | |
392 | */ | |
393 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
394 | { | |
395 | u32 cur_vblank, diff; | |
396 | ||
397 | /* | |
398 | * Interrupts were disabled prior to this call, so deal with counter | |
399 | * wrap if needed. | |
400 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
401 | * here if the register is small or we had vblank interrupts off for | |
402 | * a long time. | |
403 | */ | |
404 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
405 | diff = cur_vblank - dev->last_vblank[crtc]; | |
406 | if (cur_vblank < dev->last_vblank[crtc]) { | |
407 | diff += dev->max_vblank_count; | |
408 | ||
409 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
410 | crtc, dev->last_vblank[crtc], cur_vblank, diff); | |
411 | } | |
412 | ||
413 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", | |
414 | crtc, diff); | |
415 | ||
416 | atomic_add(diff, &dev->_vblank_count[crtc]); | |
417 | } | |
418 | ||
419 | /** | |
420 | * drm_vblank_get - get a reference count on vblank events | |
421 | * @dev: DRM device | |
422 | * @crtc: which CRTC to own | |
423 | * | |
424 | * Acquire a reference count on vblank events to avoid having them disabled | |
425 | * while in use. | |
426 | * | |
427 | * RETURNS | |
428 | * Zero on success, nonzero on failure. | |
429 | */ | |
430 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
431 | { | |
432 | unsigned long irqflags; | |
433 | int ret = 0; | |
434 | ||
435 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
436 | /* Going from 0->1 means we have to enable interrupts again */ | |
778c9026 LP |
437 | if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) { |
438 | if (!dev->vblank_enabled[crtc]) { | |
439 | ret = dev->driver->enable_vblank(dev, crtc); | |
440 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); | |
441 | if (ret) | |
442 | atomic_dec(&dev->vblank_refcount[crtc]); | |
443 | else { | |
444 | dev->vblank_enabled[crtc] = 1; | |
445 | drm_update_vblank_count(dev, crtc); | |
446 | } | |
447 | } | |
448 | } else { | |
449 | if (!dev->vblank_enabled[crtc]) { | |
0a3e67a4 | 450 | atomic_dec(&dev->vblank_refcount[crtc]); |
778c9026 | 451 | ret = -EINVAL; |
0a3e67a4 JB |
452 | } |
453 | } | |
454 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
455 | ||
456 | return ret; | |
457 | } | |
458 | EXPORT_SYMBOL(drm_vblank_get); | |
459 | ||
460 | /** | |
461 | * drm_vblank_put - give up ownership of vblank events | |
462 | * @dev: DRM device | |
463 | * @crtc: which counter to give up | |
464 | * | |
465 | * Release ownership of a given vblank counter, turning off interrupts | |
466 | * if possible. | |
467 | */ | |
468 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
469 | { | |
b3f5e732 CW |
470 | BUG_ON (atomic_read (&dev->vblank_refcount[crtc]) == 0); |
471 | ||
0a3e67a4 JB |
472 | /* Last user schedules interrupt disable */ |
473 | if (atomic_dec_and_test(&dev->vblank_refcount[crtc])) | |
474 | mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ); | |
475 | } | |
476 | EXPORT_SYMBOL(drm_vblank_put); | |
477 | ||
778c9026 LP |
478 | void drm_vblank_off(struct drm_device *dev, int crtc) |
479 | { | |
480 | unsigned long irqflags; | |
481 | ||
482 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
e32ee7fa | 483 | dev->driver->disable_vblank(dev, crtc); |
778c9026 LP |
484 | DRM_WAKEUP(&dev->vbl_queue[crtc]); |
485 | dev->vblank_enabled[crtc] = 0; | |
486 | dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc); | |
487 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
488 | } | |
489 | EXPORT_SYMBOL(drm_vblank_off); | |
490 | ||
f453ba04 DA |
491 | /** |
492 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
493 | * @dev: DRM device | |
494 | * @crtc: CRTC in question | |
495 | * @post: post or pre mode set? | |
496 | * | |
497 | * Account for vblank events across mode setting events, which will likely | |
498 | * reset the hardware frame counter. | |
499 | */ | |
500 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
501 | { | |
e77cef9c JG |
502 | /* vblank is not initialized (IRQ not installed ?) */ |
503 | if (!dev->num_crtcs) | |
504 | return; | |
f453ba04 DA |
505 | /* |
506 | * To avoid all the problems that might happen if interrupts | |
507 | * were enabled/disabled around or between these calls, we just | |
508 | * have the kernel take a reference on the CRTC (just once though | |
509 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
510 | * so that interrupts remain enabled in the interim. | |
511 | */ | |
512 | if (!dev->vblank_inmodeset[crtc]) { | |
b3f5e732 CW |
513 | dev->vblank_inmodeset[crtc] = 0x1; |
514 | if (drm_vblank_get(dev, crtc) == 0) | |
515 | dev->vblank_inmodeset[crtc] |= 0x2; | |
f453ba04 DA |
516 | } |
517 | } | |
518 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
519 | ||
520 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) | |
521 | { | |
522 | unsigned long irqflags; | |
523 | ||
524 | if (dev->vblank_inmodeset[crtc]) { | |
525 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
526 | dev->vblank_disable_allowed = 1; | |
f453ba04 | 527 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 CW |
528 | |
529 | if (dev->vblank_inmodeset[crtc] & 0x2) | |
530 | drm_vblank_put(dev, crtc); | |
531 | ||
532 | dev->vblank_inmodeset[crtc] = 0; | |
f453ba04 DA |
533 | } |
534 | } | |
535 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
536 | ||
0a3e67a4 JB |
537 | /** |
538 | * drm_modeset_ctl - handle vblank event counter changes across mode switch | |
539 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
540 | * | |
541 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
542 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
543 | * | |
544 | * Generally the counter will reset across mode sets. If interrupts are | |
545 | * enabled around this call, we don't have to do anything since the counter | |
546 | * will have already been incremented. | |
547 | */ | |
548 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
549 | struct drm_file *file_priv) | |
550 | { | |
551 | struct drm_modeset_ctl *modeset = data; | |
0a3e67a4 JB |
552 | int crtc, ret = 0; |
553 | ||
554 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
555 | if (!dev->num_crtcs) | |
556 | goto out; | |
557 | ||
558 | crtc = modeset->crtc; | |
559 | if (crtc >= dev->num_crtcs) { | |
560 | ret = -EINVAL; | |
561 | goto out; | |
562 | } | |
563 | ||
0a3e67a4 JB |
564 | switch (modeset->cmd) { |
565 | case _DRM_PRE_MODESET: | |
f453ba04 | 566 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
567 | break; |
568 | case _DRM_POST_MODESET: | |
f453ba04 | 569 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
570 | break; |
571 | default: | |
572 | ret = -EINVAL; | |
573 | break; | |
574 | } | |
575 | ||
576 | out: | |
577 | return ret; | |
578 | } | |
579 | ||
c9a9c5e0 KH |
580 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
581 | union drm_wait_vblank *vblwait, | |
582 | struct drm_file *file_priv) | |
583 | { | |
584 | struct drm_pending_vblank_event *e; | |
585 | struct timeval now; | |
586 | unsigned long flags; | |
587 | unsigned int seq; | |
588 | ||
589 | e = kzalloc(sizeof *e, GFP_KERNEL); | |
590 | if (e == NULL) | |
591 | return -ENOMEM; | |
592 | ||
593 | e->pipe = pipe; | |
b9c2c9ae | 594 | e->base.pid = current->pid; |
c9a9c5e0 KH |
595 | e->event.base.type = DRM_EVENT_VBLANK; |
596 | e->event.base.length = sizeof e->event; | |
597 | e->event.user_data = vblwait->request.signal; | |
598 | e->base.event = &e->event.base; | |
599 | e->base.file_priv = file_priv; | |
600 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
601 | ||
602 | do_gettimeofday(&now); | |
603 | spin_lock_irqsave(&dev->event_lock, flags); | |
604 | ||
605 | if (file_priv->event_space < sizeof e->event) { | |
606 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
607 | kfree(e); | |
608 | return -ENOMEM; | |
609 | } | |
610 | ||
611 | file_priv->event_space -= sizeof e->event; | |
612 | seq = drm_vblank_count(dev, pipe); | |
613 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && | |
614 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
615 | vblwait->request.sequence = seq + 1; | |
4a921645 | 616 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
617 | } |
618 | ||
619 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
620 | vblwait->request.sequence, seq, pipe); | |
621 | ||
b9c2c9ae JB |
622 | trace_drm_vblank_event_queued(current->pid, pipe, |
623 | vblwait->request.sequence); | |
624 | ||
c9a9c5e0 KH |
625 | e->event.sequence = vblwait->request.sequence; |
626 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
627 | e->event.tv_sec = now.tv_sec; | |
628 | e->event.tv_usec = now.tv_usec; | |
629 | drm_vblank_put(dev, e->pipe); | |
630 | list_add_tail(&e->base.link, &e->base.file_priv->event_list); | |
631 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
b9c2c9ae JB |
632 | trace_drm_vblank_event_delivered(current->pid, pipe, |
633 | vblwait->request.sequence); | |
c9a9c5e0 KH |
634 | } else { |
635 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
636 | } | |
637 | ||
638 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
1da177e4 LT |
643 | /** |
644 | * Wait for VBLANK. | |
645 | * | |
646 | * \param inode device inode. | |
6c340eac | 647 | * \param file_priv DRM file private. |
1da177e4 LT |
648 | * \param cmd command. |
649 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
650 | * \return zero on success or a negative number on failure. | |
651 | * | |
30b23634 EA |
652 | * This function enables the vblank interrupt on the pipe requested, then |
653 | * sleeps waiting for the requested sequence number to occur, and drops | |
654 | * the vblank interrupt refcount afterwards. (vblank irq disable follows that | |
655 | * after a timeout with no further vblank waits scheduled). | |
1da177e4 | 656 | */ |
0a3e67a4 JB |
657 | int drm_wait_vblank(struct drm_device *dev, void *data, |
658 | struct drm_file *file_priv) | |
1da177e4 | 659 | { |
c153f45f | 660 | union drm_wait_vblank *vblwait = data; |
1da177e4 | 661 | int ret = 0; |
0a3e67a4 | 662 | unsigned int flags, seq, crtc; |
1da177e4 | 663 | |
dcdb1674 | 664 | if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled)) |
1da177e4 LT |
665 | return -EINVAL; |
666 | ||
30b23634 EA |
667 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
668 | return -EINVAL; | |
669 | ||
c153f45f | 670 | if (vblwait->request.type & |
776c9443 MCA |
671 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) { |
672 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", | |
c153f45f | 673 | vblwait->request.type, |
776c9443 MCA |
674 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)); |
675 | return -EINVAL; | |
676 | } | |
677 | ||
c153f45f | 678 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
0a3e67a4 | 679 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
776c9443 | 680 | |
0a3e67a4 | 681 | if (crtc >= dev->num_crtcs) |
776c9443 MCA |
682 | return -EINVAL; |
683 | ||
0a3e67a4 JB |
684 | ret = drm_vblank_get(dev, crtc); |
685 | if (ret) { | |
8d3457ec | 686 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
687 | return ret; |
688 | } | |
689 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 690 | |
c153f45f | 691 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 692 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
693 | vblwait->request.sequence += seq; |
694 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
695 | case _DRM_VBLANK_ABSOLUTE: |
696 | break; | |
697 | default: | |
0a3e67a4 JB |
698 | ret = -EINVAL; |
699 | goto done; | |
1da177e4 LT |
700 | } |
701 | ||
c9a9c5e0 KH |
702 | if (flags & _DRM_VBLANK_EVENT) |
703 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); | |
704 | ||
ab285d74 | 705 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
706 | (seq - vblwait->request.sequence) <= (1<<23)) { |
707 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
708 | } |
709 | ||
30b23634 EA |
710 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
711 | vblwait->request.sequence, crtc); | |
712 | dev->last_vblank_wait[crtc] = vblwait->request.sequence; | |
713 | DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ, | |
714 | (((drm_vblank_count(dev, crtc) - | |
715 | vblwait->request.sequence) <= (1 << 23)) || | |
716 | !dev->irq_enabled)); | |
1da177e4 | 717 | |
30b23634 EA |
718 | if (ret != -EINTR) { |
719 | struct timeval now; | |
1da177e4 | 720 | |
30b23634 | 721 | do_gettimeofday(&now); |
049b3233 | 722 | |
30b23634 EA |
723 | vblwait->reply.tval_sec = now.tv_sec; |
724 | vblwait->reply.tval_usec = now.tv_usec; | |
725 | vblwait->reply.sequence = drm_vblank_count(dev, crtc); | |
726 | DRM_DEBUG("returning %d to client\n", | |
727 | vblwait->reply.sequence); | |
1da177e4 | 728 | } else { |
30b23634 | 729 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
730 | } |
731 | ||
0a3e67a4 JB |
732 | done: |
733 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
734 | return ret; |
735 | } | |
736 | ||
c9a9c5e0 KH |
737 | void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
738 | { | |
739 | struct drm_pending_vblank_event *e, *t; | |
740 | struct timeval now; | |
741 | unsigned long flags; | |
742 | unsigned int seq; | |
743 | ||
744 | do_gettimeofday(&now); | |
745 | seq = drm_vblank_count(dev, crtc); | |
746 | ||
747 | spin_lock_irqsave(&dev->event_lock, flags); | |
748 | ||
749 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
750 | if (e->pipe != crtc) | |
751 | continue; | |
752 | if ((seq - e->event.sequence) > (1<<23)) | |
753 | continue; | |
754 | ||
755 | DRM_DEBUG("vblank event on %d, current %d\n", | |
756 | e->event.sequence, seq); | |
757 | ||
758 | e->event.sequence = seq; | |
759 | e->event.tv_sec = now.tv_sec; | |
760 | e->event.tv_usec = now.tv_usec; | |
761 | drm_vblank_put(dev, e->pipe); | |
762 | list_move_tail(&e->base.link, &e->base.file_priv->event_list); | |
763 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
b9c2c9ae JB |
764 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, |
765 | e->event.sequence); | |
c9a9c5e0 KH |
766 | } |
767 | ||
768 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
ac2874b9 JB |
769 | |
770 | trace_drm_vblank_event(crtc, seq); | |
c9a9c5e0 KH |
771 | } |
772 | ||
0a3e67a4 JB |
773 | /** |
774 | * drm_handle_vblank - handle a vblank event | |
775 | * @dev: DRM device | |
776 | * @crtc: where this event occurred | |
777 | * | |
778 | * Drivers should call this routine in their vblank interrupt handlers to | |
779 | * update the vblank counter and send any signals that may be pending. | |
780 | */ | |
781 | void drm_handle_vblank(struct drm_device *dev, int crtc) | |
782 | { | |
c9a9c5e0 KH |
783 | if (!dev->num_crtcs) |
784 | return; | |
785 | ||
0a3e67a4 JB |
786 | atomic_inc(&dev->_vblank_count[crtc]); |
787 | DRM_WAKEUP(&dev->vbl_queue[crtc]); | |
c9a9c5e0 | 788 | drm_handle_vblank_events(dev, crtc); |
0a3e67a4 JB |
789 | } |
790 | EXPORT_SYMBOL(drm_handle_vblank); |