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Commit | Line | Data |
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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 | ||
760285e7 | 36 | #include <drm/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> |
2d1a8a48 | 43 | #include <linux/export.h> |
27641c3f MK |
44 | |
45 | /* Access macro for slots in vblank timestamp ringbuffer. */ | |
46 | #define vblanktimestamp(dev, crtc, count) ( \ | |
47 | (dev)->_vblank_time[(crtc) * DRM_VBLANKTIME_RBSIZE + \ | |
48 | ((count) % DRM_VBLANKTIME_RBSIZE)]) | |
49 | ||
50 | /* Retry timestamp calculation up to 3 times to satisfy | |
51 | * drm_timestamp_precision before giving up. | |
52 | */ | |
53 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
54 | ||
55 | /* Threshold in nanoseconds for detection of redundant | |
56 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
57 | */ | |
58 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
59 | ||
1da177e4 LT |
60 | /** |
61 | * Get interrupt from bus id. | |
b5e89ed5 | 62 | * |
1da177e4 | 63 | * \param inode device inode. |
6c340eac | 64 | * \param file_priv DRM file private. |
1da177e4 LT |
65 | * \param cmd command. |
66 | * \param arg user argument, pointing to a drm_irq_busid structure. | |
67 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 68 | * |
1da177e4 LT |
69 | * Finds the PCI device with the specified bus id and gets its IRQ number. |
70 | * This IOCTL is deprecated, and will now return EINVAL for any busid not equal | |
71 | * to that of the device that this DRM instance attached to. | |
72 | */ | |
c153f45f EA |
73 | int drm_irq_by_busid(struct drm_device *dev, void *data, |
74 | struct drm_file *file_priv) | |
1da177e4 | 75 | { |
c153f45f | 76 | struct drm_irq_busid *p = data; |
1da177e4 | 77 | |
8410ea3b | 78 | if (!dev->driver->bus->irq_by_busid) |
dcdb1674 JC |
79 | return -EINVAL; |
80 | ||
1da177e4 LT |
81 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
82 | return -EINVAL; | |
83 | ||
8410ea3b | 84 | return dev->driver->bus->irq_by_busid(dev, p); |
1da177e4 LT |
85 | } |
86 | ||
27641c3f MK |
87 | /* |
88 | * Clear vblank timestamp buffer for a crtc. | |
89 | */ | |
90 | static void clear_vblank_timestamps(struct drm_device *dev, int crtc) | |
91 | { | |
92 | memset(&dev->_vblank_time[crtc * DRM_VBLANKTIME_RBSIZE], 0, | |
93 | DRM_VBLANKTIME_RBSIZE * sizeof(struct timeval)); | |
94 | } | |
95 | ||
96 | /* | |
97 | * Disable vblank irq's on crtc, make sure that last vblank count | |
98 | * of hardware and corresponding consistent software vblank counter | |
99 | * are preserved, even if there are any spurious vblank irq's after | |
100 | * disable. | |
101 | */ | |
102 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
103 | { | |
104 | unsigned long irqflags; | |
105 | u32 vblcount; | |
106 | s64 diff_ns; | |
107 | int vblrc; | |
108 | struct timeval tvblank; | |
0355cf3a | 109 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
110 | |
111 | /* Prevent vblank irq processing while disabling vblank irqs, | |
112 | * so no updates of timestamps or count can happen after we've | |
113 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 114 | */ |
27641c3f MK |
115 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
116 | ||
117 | dev->driver->disable_vblank(dev, crtc); | |
118 | dev->vblank_enabled[crtc] = 0; | |
119 | ||
120 | /* No further vblank irq's will be processed after | |
121 | * this point. Get current hardware vblank count and | |
122 | * vblank timestamp, repeat until they are consistent. | |
123 | * | |
124 | * FIXME: There is still a race condition here and in | |
125 | * drm_update_vblank_count() which can cause off-by-one | |
126 | * reinitialization of software vblank counter. If gpu | |
127 | * vblank counter doesn't increment exactly at the leading | |
128 | * edge of a vblank interval, then we can lose 1 count if | |
129 | * we happen to execute between start of vblank and the | |
130 | * delayed gpu counter increment. | |
131 | */ | |
132 | do { | |
133 | dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc); | |
134 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); | |
0355cf3a EE |
135 | } while (dev->last_vblank[crtc] != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc); |
136 | ||
137 | if (!count) | |
138 | vblrc = 0; | |
27641c3f MK |
139 | |
140 | /* Compute time difference to stored timestamp of last vblank | |
141 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
142 | */ | |
143 | vblcount = atomic_read(&dev->_vblank_count[crtc]); | |
144 | diff_ns = timeval_to_ns(&tvblank) - | |
145 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
146 | ||
147 | /* If there is at least 1 msec difference between the last stored | |
148 | * timestamp and tvblank, then we are currently executing our | |
149 | * disable inside a new vblank interval, the tvblank timestamp | |
150 | * corresponds to this new vblank interval and the irq handler | |
151 | * for this vblank didn't run yet and won't run due to our disable. | |
152 | * Therefore we need to do the job of drm_handle_vblank() and | |
153 | * increment the vblank counter by one to account for this vblank. | |
154 | * | |
155 | * Skip this step if there isn't any high precision timestamp | |
156 | * available. In that case we can't account for this and just | |
157 | * hope for the best. | |
158 | */ | |
bc215128 | 159 | if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) { |
27641c3f | 160 | atomic_inc(&dev->_vblank_count[crtc]); |
bc215128 MK |
161 | smp_mb__after_atomic_inc(); |
162 | } | |
27641c3f MK |
163 | |
164 | /* Invalidate all timestamps while vblank irq's are off. */ | |
165 | clear_vblank_timestamps(dev, crtc); | |
166 | ||
167 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
27641c3f MK |
168 | } |
169 | ||
0a3e67a4 JB |
170 | static void vblank_disable_fn(unsigned long arg) |
171 | { | |
172 | struct drm_device *dev = (struct drm_device *)arg; | |
173 | unsigned long irqflags; | |
174 | int i; | |
175 | ||
176 | if (!dev->vblank_disable_allowed) | |
177 | return; | |
178 | ||
179 | for (i = 0; i < dev->num_crtcs; i++) { | |
180 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
181 | if (atomic_read(&dev->vblank_refcount[i]) == 0 && | |
182 | dev->vblank_enabled[i]) { | |
183 | DRM_DEBUG("disabling vblank on crtc %d\n", i); | |
27641c3f | 184 | vblank_disable_and_save(dev, i); |
0a3e67a4 JB |
185 | } |
186 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
187 | } | |
188 | } | |
189 | ||
52440211 | 190 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 JB |
191 | { |
192 | /* Bail if the driver didn't call drm_vblank_init() */ | |
193 | if (dev->num_crtcs == 0) | |
194 | return; | |
195 | ||
7eb3b2c8 | 196 | del_timer_sync(&dev->vblank_disable_timer); |
0a3e67a4 JB |
197 | |
198 | vblank_disable_fn((unsigned long)dev); | |
199 | ||
9a298b2a EA |
200 | kfree(dev->vbl_queue); |
201 | kfree(dev->_vblank_count); | |
202 | kfree(dev->vblank_refcount); | |
203 | kfree(dev->vblank_enabled); | |
204 | kfree(dev->last_vblank); | |
205 | kfree(dev->last_vblank_wait); | |
206 | kfree(dev->vblank_inmodeset); | |
27641c3f | 207 | kfree(dev->_vblank_time); |
0a3e67a4 JB |
208 | |
209 | dev->num_crtcs = 0; | |
210 | } | |
e77cef9c | 211 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 JB |
212 | |
213 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) | |
214 | { | |
215 | int i, ret = -ENOMEM; | |
216 | ||
217 | setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, | |
218 | (unsigned long)dev); | |
219 | spin_lock_init(&dev->vbl_lock); | |
27641c3f MK |
220 | spin_lock_init(&dev->vblank_time_lock); |
221 | ||
0a3e67a4 JB |
222 | dev->num_crtcs = num_crtcs; |
223 | ||
9a298b2a EA |
224 | dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs, |
225 | GFP_KERNEL); | |
0a3e67a4 JB |
226 | if (!dev->vbl_queue) |
227 | goto err; | |
228 | ||
9a298b2a | 229 | dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL); |
0a3e67a4 JB |
230 | if (!dev->_vblank_count) |
231 | goto err; | |
232 | ||
9a298b2a EA |
233 | dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs, |
234 | GFP_KERNEL); | |
0a3e67a4 JB |
235 | if (!dev->vblank_refcount) |
236 | goto err; | |
237 | ||
9a298b2a | 238 | dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
239 | if (!dev->vblank_enabled) |
240 | goto err; | |
241 | ||
9a298b2a | 242 | dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
0a3e67a4 JB |
243 | if (!dev->last_vblank) |
244 | goto err; | |
245 | ||
9a298b2a | 246 | dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
fede5c91 EA |
247 | if (!dev->last_vblank_wait) |
248 | goto err; | |
249 | ||
9a298b2a | 250 | dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
251 | if (!dev->vblank_inmodeset) |
252 | goto err; | |
253 | ||
27641c3f MK |
254 | dev->_vblank_time = kcalloc(num_crtcs * DRM_VBLANKTIME_RBSIZE, |
255 | sizeof(struct timeval), GFP_KERNEL); | |
256 | if (!dev->_vblank_time) | |
257 | goto err; | |
258 | ||
259 | DRM_INFO("Supports vblank timestamp caching Rev 1 (10.10.2010).\n"); | |
260 | ||
261 | /* Driver specific high-precision vblank timestamping supported? */ | |
262 | if (dev->driver->get_vblank_timestamp) | |
263 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
264 | else | |
265 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
266 | ||
0a3e67a4 JB |
267 | /* Zero per-crtc vblank stuff */ |
268 | for (i = 0; i < num_crtcs; i++) { | |
269 | init_waitqueue_head(&dev->vbl_queue[i]); | |
0a3e67a4 JB |
270 | atomic_set(&dev->_vblank_count[i], 0); |
271 | atomic_set(&dev->vblank_refcount[i], 0); | |
272 | } | |
273 | ||
274 | dev->vblank_disable_allowed = 0; | |
0a3e67a4 JB |
275 | return 0; |
276 | ||
277 | err: | |
278 | drm_vblank_cleanup(dev); | |
279 | return ret; | |
280 | } | |
281 | EXPORT_SYMBOL(drm_vblank_init); | |
282 | ||
28d52043 DA |
283 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
284 | { | |
285 | struct drm_device *dev = cookie; | |
286 | ||
287 | if (dev->driver->vgaarb_irq) { | |
288 | dev->driver->vgaarb_irq(dev, state); | |
289 | return; | |
290 | } | |
291 | ||
292 | if (!dev->irq_enabled) | |
293 | return; | |
294 | ||
5037f8ac JS |
295 | if (state) { |
296 | if (dev->driver->irq_uninstall) | |
297 | dev->driver->irq_uninstall(dev); | |
298 | } else { | |
299 | if (dev->driver->irq_preinstall) | |
300 | dev->driver->irq_preinstall(dev); | |
301 | if (dev->driver->irq_postinstall) | |
302 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
303 | } |
304 | } | |
305 | ||
1da177e4 LT |
306 | /** |
307 | * Install IRQ handler. | |
308 | * | |
309 | * \param dev DRM device. | |
1da177e4 | 310 | * |
0a3e67a4 | 311 | * Initializes the IRQ related data. Installs the handler, calling the driver |
884a53ef | 312 | * \c irq_preinstall() and \c irq_postinstall() functions |
1da177e4 LT |
313 | * before and after the installation. |
314 | */ | |
0a3e67a4 | 315 | int drm_irq_install(struct drm_device *dev) |
1da177e4 | 316 | { |
4a1b0714 | 317 | int ret; |
b5e89ed5 | 318 | unsigned long sh_flags = 0; |
b8da7de5 | 319 | char *irqname; |
1da177e4 LT |
320 | |
321 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
322 | return -EINVAL; | |
323 | ||
dcdb1674 | 324 | if (drm_dev_to_irq(dev) == 0) |
1da177e4 LT |
325 | return -EINVAL; |
326 | ||
30e2fb18 | 327 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
328 | |
329 | /* Driver must have been initialized */ | |
b5e89ed5 | 330 | if (!dev->dev_private) { |
30e2fb18 | 331 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
332 | return -EINVAL; |
333 | } | |
334 | ||
b5e89ed5 | 335 | if (dev->irq_enabled) { |
30e2fb18 | 336 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
337 | return -EBUSY; |
338 | } | |
339 | dev->irq_enabled = 1; | |
30e2fb18 | 340 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 341 | |
dcdb1674 | 342 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
1da177e4 | 343 | |
b5e89ed5 | 344 | /* Before installing handler */ |
5037f8ac JS |
345 | if (dev->driver->irq_preinstall) |
346 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 347 | |
b5e89ed5 | 348 | /* Install handler */ |
1da177e4 | 349 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 350 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 351 | |
b8da7de5 DA |
352 | if (dev->devname) |
353 | irqname = dev->devname; | |
354 | else | |
355 | irqname = dev->driver->name; | |
356 | ||
9bfbd5cb | 357 | ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, |
b8da7de5 | 358 | sh_flags, irqname, dev); |
9bfbd5cb | 359 | |
b5e89ed5 | 360 | if (ret < 0) { |
30e2fb18 | 361 | mutex_lock(&dev->struct_mutex); |
1da177e4 | 362 | dev->irq_enabled = 0; |
30e2fb18 | 363 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
364 | return ret; |
365 | } | |
366 | ||
28d52043 DA |
367 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
368 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
369 | ||
b5e89ed5 | 370 | /* After installing handler */ |
5037f8ac JS |
371 | if (dev->driver->irq_postinstall) |
372 | ret = dev->driver->irq_postinstall(dev); | |
373 | ||
0a3e67a4 JB |
374 | if (ret < 0) { |
375 | mutex_lock(&dev->struct_mutex); | |
376 | dev->irq_enabled = 0; | |
377 | mutex_unlock(&dev->struct_mutex); | |
e1c44acc JS |
378 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
379 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
380 | free_irq(drm_dev_to_irq(dev), dev); | |
0a3e67a4 | 381 | } |
1da177e4 | 382 | |
0a3e67a4 | 383 | return ret; |
1da177e4 | 384 | } |
0a3e67a4 | 385 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
386 | |
387 | /** | |
388 | * Uninstall the IRQ handler. | |
389 | * | |
390 | * \param dev DRM device. | |
391 | * | |
884a53ef | 392 | * Calls the driver's \c irq_uninstall() function, and stops the irq. |
1da177e4 | 393 | */ |
27641c3f | 394 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 395 | { |
dc1336ff JB |
396 | unsigned long irqflags; |
397 | int irq_enabled, i; | |
1da177e4 LT |
398 | |
399 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
400 | return -EINVAL; | |
401 | ||
30e2fb18 | 402 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
403 | irq_enabled = dev->irq_enabled; |
404 | dev->irq_enabled = 0; | |
30e2fb18 | 405 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 406 | |
dc1336ff JB |
407 | /* |
408 | * Wake up any waiters so they don't hang. | |
409 | */ | |
bde4889a BS |
410 | if (dev->num_crtcs) { |
411 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
412 | for (i = 0; i < dev->num_crtcs; i++) { | |
413 | DRM_WAKEUP(&dev->vbl_queue[i]); | |
414 | dev->vblank_enabled[i] = 0; | |
415 | dev->last_vblank[i] = | |
416 | dev->driver->get_vblank_counter(dev, i); | |
417 | } | |
418 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 419 | } |
dc1336ff | 420 | |
b5e89ed5 | 421 | if (!irq_enabled) |
1da177e4 LT |
422 | return -EINVAL; |
423 | ||
dcdb1674 | 424 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
1da177e4 | 425 | |
28d52043 DA |
426 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
427 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
428 | ||
5037f8ac JS |
429 | if (dev->driver->irq_uninstall) |
430 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 431 | |
dcdb1674 | 432 | free_irq(drm_dev_to_irq(dev), dev); |
1da177e4 LT |
433 | |
434 | return 0; | |
435 | } | |
436 | EXPORT_SYMBOL(drm_irq_uninstall); | |
437 | ||
438 | /** | |
439 | * IRQ control ioctl. | |
440 | * | |
441 | * \param inode device inode. | |
6c340eac | 442 | * \param file_priv DRM file private. |
1da177e4 LT |
443 | * \param cmd command. |
444 | * \param arg user argument, pointing to a drm_control structure. | |
445 | * \return zero on success or a negative number on failure. | |
446 | * | |
447 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
448 | */ | |
c153f45f EA |
449 | int drm_control(struct drm_device *dev, void *data, |
450 | struct drm_file *file_priv) | |
1da177e4 | 451 | { |
c153f45f | 452 | struct drm_control *ctl = data; |
b5e89ed5 | 453 | |
27641c3f MK |
454 | /* if we haven't irq we fallback for compatibility reasons - |
455 | * this used to be a separate function in drm_dma.h | |
456 | */ | |
1da177e4 | 457 | |
1da177e4 | 458 | |
c153f45f | 459 | switch (ctl->func) { |
1da177e4 LT |
460 | case DRM_INST_HANDLER: |
461 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
462 | return 0; | |
f453ba04 DA |
463 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
464 | return 0; | |
1da177e4 | 465 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
dcdb1674 | 466 | ctl->irq != drm_dev_to_irq(dev)) |
1da177e4 | 467 | return -EINVAL; |
b5e89ed5 | 468 | return drm_irq_install(dev); |
1da177e4 LT |
469 | case DRM_UNINST_HANDLER: |
470 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
471 | return 0; | |
f453ba04 DA |
472 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
473 | return 0; | |
b5e89ed5 | 474 | return drm_irq_uninstall(dev); |
1da177e4 LT |
475 | default: |
476 | return -EINVAL; | |
477 | } | |
478 | } | |
479 | ||
27641c3f MK |
480 | /** |
481 | * drm_calc_timestamping_constants - Calculate and | |
482 | * store various constants which are later needed by | |
483 | * vblank and swap-completion timestamping, e.g, by | |
484 | * drm_calc_vbltimestamp_from_scanoutpos(). | |
485 | * They are derived from crtc's true scanout timing, | |
486 | * so they take things like panel scaling or other | |
487 | * adjustments into account. | |
488 | * | |
489 | * @crtc drm_crtc whose timestamp constants should be updated. | |
490 | * | |
491 | */ | |
492 | void drm_calc_timestamping_constants(struct drm_crtc *crtc) | |
493 | { | |
494 | s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; | |
495 | u64 dotclock; | |
496 | ||
497 | /* Dot clock in Hz: */ | |
498 | dotclock = (u64) crtc->hwmode.clock * 1000; | |
499 | ||
9be6f8a9 MK |
500 | /* Fields of interlaced scanout modes are only halve a frame duration. |
501 | * Double the dotclock to get halve the frame-/line-/pixelduration. | |
502 | */ | |
503 | if (crtc->hwmode.flags & DRM_MODE_FLAG_INTERLACE) | |
504 | dotclock *= 2; | |
505 | ||
27641c3f MK |
506 | /* Valid dotclock? */ |
507 | if (dotclock > 0) { | |
85a7ce67 | 508 | int frame_size; |
27641c3f MK |
509 | /* Convert scanline length in pixels and video dot clock to |
510 | * line duration, frame duration and pixel duration in | |
511 | * nanoseconds: | |
512 | */ | |
513 | pixeldur_ns = (s64) div64_u64(1000000000, dotclock); | |
514 | linedur_ns = (s64) div64_u64(((u64) crtc->hwmode.crtc_htotal * | |
515 | 1000000000), dotclock); | |
85a7ce67 DK |
516 | frame_size = crtc->hwmode.crtc_htotal * |
517 | crtc->hwmode.crtc_vtotal; | |
518 | framedur_ns = (s64) div64_u64((u64) frame_size * 1000000000, | |
519 | dotclock); | |
27641c3f MK |
520 | } else |
521 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", | |
522 | crtc->base.id); | |
523 | ||
524 | crtc->pixeldur_ns = pixeldur_ns; | |
525 | crtc->linedur_ns = linedur_ns; | |
526 | crtc->framedur_ns = framedur_ns; | |
527 | ||
528 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
529 | crtc->base.id, crtc->hwmode.crtc_htotal, | |
530 | crtc->hwmode.crtc_vtotal, crtc->hwmode.crtc_vdisplay); | |
531 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", | |
532 | crtc->base.id, (int) dotclock/1000, (int) framedur_ns, | |
533 | (int) linedur_ns, (int) pixeldur_ns); | |
534 | } | |
535 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
536 | ||
537 | /** | |
538 | * drm_calc_vbltimestamp_from_scanoutpos - helper routine for kms | |
539 | * drivers. Implements calculation of exact vblank timestamps from | |
540 | * given drm_display_mode timings and current video scanout position | |
541 | * of a crtc. This can be called from within get_vblank_timestamp() | |
542 | * implementation of a kms driver to implement the actual timestamping. | |
543 | * | |
544 | * Should return timestamps conforming to the OML_sync_control OpenML | |
545 | * extension specification. The timestamp corresponds to the end of | |
546 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
547 | * pixel in the following video frame. | |
548 | * | |
549 | * Requires support for optional dev->driver->get_scanout_position() | |
550 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
551 | * that corresponds to the true scanout timing. | |
552 | * | |
553 | * The current implementation only handles standard video modes. It | |
554 | * returns as no operation if a doublescan or interlaced video mode is | |
555 | * active. Higher level code is expected to handle this. | |
556 | * | |
557 | * @dev: DRM device. | |
558 | * @crtc: Which crtc's vblank timestamp to retrieve. | |
559 | * @max_error: Desired maximum allowable error in timestamps (nanosecs). | |
560 | * On return contains true maximum error of timestamp. | |
561 | * @vblank_time: Pointer to struct timeval which should receive the timestamp. | |
562 | * @flags: Flags to pass to driver: | |
563 | * 0 = Default. | |
564 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. | |
565 | * @refcrtc: drm_crtc* of crtc which defines scanout timing. | |
566 | * | |
567 | * Returns negative value on error, failure or if not supported in current | |
568 | * video mode: | |
569 | * | |
570 | * -EINVAL - Invalid crtc. | |
571 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. | |
572 | * -ENOTSUPP - Function not supported in current display mode. | |
573 | * -EIO - Failed, e.g., due to failed scanout position query. | |
574 | * | |
575 | * Returns or'ed positive status flags on success: | |
576 | * | |
577 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
578 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
579 | * | |
580 | */ | |
581 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, | |
582 | int *max_error, | |
583 | struct timeval *vblank_time, | |
584 | unsigned flags, | |
585 | struct drm_crtc *refcrtc) | |
586 | { | |
e62f2f5a ID |
587 | ktime_t stime, etime, mono_time_offset; |
588 | struct timeval tv_etime; | |
27641c3f MK |
589 | struct drm_display_mode *mode; |
590 | int vbl_status, vtotal, vdisplay; | |
591 | int vpos, hpos, i; | |
592 | s64 framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; | |
593 | bool invbl; | |
594 | ||
595 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
596 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
597 | return -EINVAL; | |
598 | } | |
599 | ||
600 | /* Scanout position query not supported? Should not happen. */ | |
601 | if (!dev->driver->get_scanout_position) { | |
602 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
603 | return -EIO; | |
604 | } | |
605 | ||
606 | mode = &refcrtc->hwmode; | |
607 | vtotal = mode->crtc_vtotal; | |
608 | vdisplay = mode->crtc_vdisplay; | |
609 | ||
610 | /* Durations of frames, lines, pixels in nanoseconds. */ | |
611 | framedur_ns = refcrtc->framedur_ns; | |
612 | linedur_ns = refcrtc->linedur_ns; | |
613 | pixeldur_ns = refcrtc->pixeldur_ns; | |
614 | ||
615 | /* If mode timing undefined, just return as no-op: | |
616 | * Happens during initial modesetting of a crtc. | |
617 | */ | |
618 | if (vtotal <= 0 || vdisplay <= 0 || framedur_ns == 0) { | |
619 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); | |
620 | return -EAGAIN; | |
621 | } | |
622 | ||
27641c3f MK |
623 | /* Get current scanout position with system timestamp. |
624 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
625 | * if single query takes longer than max_error nanoseconds. | |
626 | * | |
627 | * This guarantees a tight bound on maximum error if | |
628 | * code gets preempted or delayed for some reason. | |
629 | */ | |
630 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
631 | /* Disable preemption to make it very likely to | |
632 | * succeed in the first iteration even on PREEMPT_RT kernel. | |
633 | */ | |
634 | preempt_disable(); | |
635 | ||
636 | /* Get system timestamp before query. */ | |
e62f2f5a | 637 | stime = ktime_get(); |
27641c3f MK |
638 | |
639 | /* Get vertical and horizontal scanout pos. vpos, hpos. */ | |
640 | vbl_status = dev->driver->get_scanout_position(dev, crtc, &vpos, &hpos); | |
641 | ||
642 | /* Get system timestamp after query. */ | |
e62f2f5a | 643 | etime = ktime_get(); |
c61eef72 ID |
644 | if (!drm_timestamp_monotonic) |
645 | mono_time_offset = ktime_get_monotonic_offset(); | |
27641c3f MK |
646 | |
647 | preempt_enable(); | |
648 | ||
649 | /* Return as no-op if scanout query unsupported or failed. */ | |
650 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
651 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
652 | crtc, vbl_status); | |
653 | return -EIO; | |
654 | } | |
655 | ||
e62f2f5a | 656 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
657 | |
658 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
659 | if (duration_ns <= (s64) *max_error) | |
660 | break; | |
661 | } | |
662 | ||
663 | /* Noisy system timing? */ | |
664 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
665 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
666 | crtc, (int) duration_ns/1000, *max_error/1000, i); | |
667 | } | |
668 | ||
669 | /* Return upper bound of timestamp precision error. */ | |
670 | *max_error = (int) duration_ns; | |
671 | ||
672 | /* Check if in vblank area: | |
673 | * vpos is >=0 in video scanout area, but negative | |
674 | * within vblank area, counting down the number of lines until | |
675 | * start of scanout. | |
676 | */ | |
677 | invbl = vbl_status & DRM_SCANOUTPOS_INVBL; | |
678 | ||
679 | /* Convert scanout position into elapsed time at raw_time query | |
680 | * since start of scanout at first display scanline. delta_ns | |
681 | * can be negative if start of scanout hasn't happened yet. | |
682 | */ | |
683 | delta_ns = (s64) vpos * linedur_ns + (s64) hpos * pixeldur_ns; | |
684 | ||
685 | /* Is vpos outside nominal vblank area, but less than | |
686 | * 1/100 of a frame height away from start of vblank? | |
687 | * If so, assume this isn't a massively delayed vblank | |
688 | * interrupt, but a vblank interrupt that fired a few | |
689 | * microseconds before true start of vblank. Compensate | |
690 | * by adding a full frame duration to the final timestamp. | |
691 | * Happens, e.g., on ATI R500, R600. | |
692 | * | |
693 | * We only do this if DRM_CALLED_FROM_VBLIRQ. | |
694 | */ | |
695 | if ((flags & DRM_CALLED_FROM_VBLIRQ) && !invbl && | |
696 | ((vdisplay - vpos) < vtotal / 100)) { | |
697 | delta_ns = delta_ns - framedur_ns; | |
698 | ||
699 | /* Signal this correction as "applied". */ | |
700 | vbl_status |= 0x8; | |
701 | } | |
702 | ||
c61eef72 ID |
703 | if (!drm_timestamp_monotonic) |
704 | etime = ktime_sub(etime, mono_time_offset); | |
705 | ||
e62f2f5a ID |
706 | /* save this only for debugging purposes */ |
707 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
708 | /* Subtract time delta from raw timestamp to get final |
709 | * vblank_time timestamp for end of vblank. | |
710 | */ | |
e62f2f5a ID |
711 | etime = ktime_sub_ns(etime, delta_ns); |
712 | *vblank_time = ktime_to_timeval(etime); | |
27641c3f | 713 | |
bbb0aef5 JP |
714 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
715 | crtc, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 716 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 JP |
717 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
718 | (int)duration_ns/1000, i); | |
27641c3f MK |
719 | |
720 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
721 | if (invbl) | |
722 | vbl_status |= DRM_VBLANKTIME_INVBL; | |
723 | ||
724 | return vbl_status; | |
725 | } | |
726 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
727 | ||
c61eef72 ID |
728 | static struct timeval get_drm_timestamp(void) |
729 | { | |
730 | ktime_t now; | |
731 | ||
732 | now = ktime_get(); | |
733 | if (!drm_timestamp_monotonic) | |
734 | now = ktime_sub(now, ktime_get_monotonic_offset()); | |
735 | ||
736 | return ktime_to_timeval(now); | |
737 | } | |
738 | ||
27641c3f MK |
739 | /** |
740 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
741 | * vblank interval. | |
742 | * | |
743 | * @dev: DRM device | |
744 | * @crtc: which crtc's vblank timestamp to retrieve | |
745 | * @tvblank: Pointer to target struct timeval which should receive the timestamp | |
746 | * @flags: Flags to pass to driver: | |
747 | * 0 = Default. | |
748 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. | |
749 | * | |
750 | * Fetches the system timestamp corresponding to the time of the most recent | |
751 | * vblank interval on specified crtc. May call into kms-driver to | |
752 | * compute the timestamp with a high-precision GPU specific method. | |
753 | * | |
754 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
755 | * call, i.e., it isn't very precisely locked to the true vblank. | |
756 | * | |
757 | * Returns non-zero if timestamp is considered to be very precise. | |
758 | */ | |
759 | u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
760 | struct timeval *tvblank, unsigned flags) | |
761 | { | |
4a1b0714 | 762 | int ret; |
27641c3f MK |
763 | |
764 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
765 | int max_error = (int) drm_timestamp_precision * 1000; | |
766 | ||
767 | /* Query driver if possible and precision timestamping enabled. */ | |
768 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
769 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
770 | tvblank, flags); | |
771 | if (ret > 0) | |
772 | return (u32) ret; | |
773 | } | |
774 | ||
775 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 776 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 777 | */ |
c61eef72 | 778 | *tvblank = get_drm_timestamp(); |
27641c3f MK |
779 | |
780 | return 0; | |
781 | } | |
782 | EXPORT_SYMBOL(drm_get_last_vbltimestamp); | |
783 | ||
0a3e67a4 JB |
784 | /** |
785 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
786 | * @dev: DRM device | |
787 | * @crtc: which counter to retrieve | |
788 | * | |
789 | * Fetches the "cooked" vblank count value that represents the number of | |
790 | * vblank events since the system was booted, including lost events due to | |
791 | * modesetting activity. | |
792 | */ | |
793 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
794 | { | |
795 | return atomic_read(&dev->_vblank_count[crtc]); | |
796 | } | |
797 | EXPORT_SYMBOL(drm_vblank_count); | |
798 | ||
27641c3f MK |
799 | /** |
800 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
801 | * and the system timestamp corresponding to that vblank counter value. | |
802 | * | |
803 | * @dev: DRM device | |
804 | * @crtc: which counter to retrieve | |
805 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
806 | * | |
807 | * Fetches the "cooked" vblank count value that represents the number of | |
808 | * vblank events since the system was booted, including lost events due to | |
809 | * modesetting activity. Returns corresponding system timestamp of the time | |
810 | * of the vblank interval that corresponds to the current value vblank counter | |
811 | * value. | |
812 | */ | |
813 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
814 | struct timeval *vblanktime) | |
815 | { | |
816 | u32 cur_vblank; | |
817 | ||
818 | /* Read timestamp from slot of _vblank_time ringbuffer | |
819 | * that corresponds to current vblank count. Retry if | |
820 | * count has incremented during readout. This works like | |
821 | * a seqlock. | |
822 | */ | |
823 | do { | |
824 | cur_vblank = atomic_read(&dev->_vblank_count[crtc]); | |
825 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); | |
826 | smp_rmb(); | |
827 | } while (cur_vblank != atomic_read(&dev->_vblank_count[crtc])); | |
828 | ||
829 | return cur_vblank; | |
830 | } | |
831 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
832 | ||
c6eefa17 RC |
833 | static void send_vblank_event(struct drm_device *dev, |
834 | struct drm_pending_vblank_event *e, | |
835 | unsigned long seq, struct timeval *now) | |
836 | { | |
837 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
838 | e->event.sequence = seq; | |
839 | e->event.tv_sec = now->tv_sec; | |
840 | e->event.tv_usec = now->tv_usec; | |
841 | ||
842 | list_add_tail(&e->base.link, | |
843 | &e->base.file_priv->event_list); | |
844 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
845 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
846 | e->event.sequence); | |
847 | } | |
848 | ||
849 | /** | |
850 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
851 | * @dev: DRM device | |
852 | * @crtc: CRTC in question | |
853 | * @e: the event to send | |
854 | * | |
855 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
856 | * Caller must hold event lock. | |
857 | */ | |
858 | void drm_send_vblank_event(struct drm_device *dev, int crtc, | |
859 | struct drm_pending_vblank_event *e) | |
860 | { | |
861 | struct timeval now; | |
862 | unsigned int seq; | |
863 | if (crtc >= 0) { | |
864 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
865 | } else { | |
866 | seq = 0; | |
c61eef72 ID |
867 | |
868 | now = get_drm_timestamp(); | |
c6eefa17 | 869 | } |
21a245d2 | 870 | e->pipe = crtc; |
c6eefa17 RC |
871 | send_vblank_event(dev, e, seq, &now); |
872 | } | |
873 | EXPORT_SYMBOL(drm_send_vblank_event); | |
874 | ||
0a3e67a4 JB |
875 | /** |
876 | * drm_update_vblank_count - update the master vblank counter | |
877 | * @dev: DRM device | |
878 | * @crtc: counter to update | |
879 | * | |
880 | * Call back into the driver to update the appropriate vblank counter | |
881 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
882 | * update the last read value so we can deal with wraparound on the next | |
883 | * call if necessary. | |
884 | * | |
885 | * Only necessary when going from off->on, to account for frames we | |
886 | * didn't get an interrupt for. | |
887 | * | |
888 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
889 | * device vblank fields. | |
890 | */ | |
891 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
892 | { | |
27641c3f MK |
893 | u32 cur_vblank, diff, tslot, rc; |
894 | struct timeval t_vblank; | |
0a3e67a4 JB |
895 | |
896 | /* | |
897 | * Interrupts were disabled prior to this call, so deal with counter | |
898 | * wrap if needed. | |
899 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
900 | * here if the register is small or we had vblank interrupts off for | |
901 | * a long time. | |
27641c3f MK |
902 | * |
903 | * We repeat the hardware vblank counter & timestamp query until | |
904 | * we get consistent results. This to prevent races between gpu | |
905 | * updating its hardware counter while we are retrieving the | |
906 | * corresponding vblank timestamp. | |
0a3e67a4 | 907 | */ |
27641c3f MK |
908 | do { |
909 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
910 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
911 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
912 | ||
913 | /* Deal with counter wrap */ | |
0a3e67a4 JB |
914 | diff = cur_vblank - dev->last_vblank[crtc]; |
915 | if (cur_vblank < dev->last_vblank[crtc]) { | |
916 | diff += dev->max_vblank_count; | |
917 | ||
918 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
919 | crtc, dev->last_vblank[crtc], cur_vblank, diff); | |
920 | } | |
921 | ||
922 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", | |
923 | crtc, diff); | |
924 | ||
27641c3f MK |
925 | /* Reinitialize corresponding vblank timestamp if high-precision query |
926 | * available. Skip this step if query unsupported or failed. Will | |
927 | * reinitialize delayed at next vblank interrupt in that case. | |
928 | */ | |
929 | if (rc) { | |
930 | tslot = atomic_read(&dev->_vblank_count[crtc]) + diff; | |
931 | vblanktimestamp(dev, crtc, tslot) = t_vblank; | |
27641c3f MK |
932 | } |
933 | ||
bc215128 | 934 | smp_mb__before_atomic_inc(); |
0a3e67a4 | 935 | atomic_add(diff, &dev->_vblank_count[crtc]); |
bc215128 | 936 | smp_mb__after_atomic_inc(); |
0a3e67a4 JB |
937 | } |
938 | ||
939 | /** | |
940 | * drm_vblank_get - get a reference count on vblank events | |
941 | * @dev: DRM device | |
942 | * @crtc: which CRTC to own | |
943 | * | |
944 | * Acquire a reference count on vblank events to avoid having them disabled | |
945 | * while in use. | |
946 | * | |
947 | * RETURNS | |
948 | * Zero on success, nonzero on failure. | |
949 | */ | |
950 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
951 | { | |
27641c3f | 952 | unsigned long irqflags, irqflags2; |
0a3e67a4 JB |
953 | int ret = 0; |
954 | ||
955 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
956 | /* Going from 0->1 means we have to enable interrupts again */ | |
778c9026 | 957 | if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) { |
27641c3f | 958 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags2); |
778c9026 | 959 | if (!dev->vblank_enabled[crtc]) { |
27641c3f MK |
960 | /* Enable vblank irqs under vblank_time_lock protection. |
961 | * All vblank count & timestamp updates are held off | |
962 | * until we are done reinitializing master counter and | |
963 | * timestamps. Filtercode in drm_handle_vblank() will | |
964 | * prevent double-accounting of same vblank interval. | |
965 | */ | |
778c9026 | 966 | ret = dev->driver->enable_vblank(dev, crtc); |
27641c3f MK |
967 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", |
968 | crtc, ret); | |
778c9026 LP |
969 | if (ret) |
970 | atomic_dec(&dev->vblank_refcount[crtc]); | |
971 | else { | |
972 | dev->vblank_enabled[crtc] = 1; | |
973 | drm_update_vblank_count(dev, crtc); | |
974 | } | |
975 | } | |
27641c3f | 976 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2); |
778c9026 LP |
977 | } else { |
978 | if (!dev->vblank_enabled[crtc]) { | |
0a3e67a4 | 979 | atomic_dec(&dev->vblank_refcount[crtc]); |
778c9026 | 980 | ret = -EINVAL; |
0a3e67a4 JB |
981 | } |
982 | } | |
983 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
984 | ||
985 | return ret; | |
986 | } | |
987 | EXPORT_SYMBOL(drm_vblank_get); | |
988 | ||
989 | /** | |
990 | * drm_vblank_put - give up ownership of vblank events | |
991 | * @dev: DRM device | |
992 | * @crtc: which counter to give up | |
993 | * | |
994 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 995 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
0a3e67a4 JB |
996 | */ |
997 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
998 | { | |
27641c3f | 999 | BUG_ON(atomic_read(&dev->vblank_refcount[crtc]) == 0); |
b3f5e732 | 1000 | |
0a3e67a4 | 1001 | /* Last user schedules interrupt disable */ |
27641c3f MK |
1002 | if (atomic_dec_and_test(&dev->vblank_refcount[crtc]) && |
1003 | (drm_vblank_offdelay > 0)) | |
1004 | mod_timer(&dev->vblank_disable_timer, | |
1005 | jiffies + ((drm_vblank_offdelay * DRM_HZ)/1000)); | |
0a3e67a4 JB |
1006 | } |
1007 | EXPORT_SYMBOL(drm_vblank_put); | |
1008 | ||
c6eefa17 RC |
1009 | /** |
1010 | * drm_vblank_off - disable vblank events on a CRTC | |
1011 | * @dev: DRM device | |
1012 | * @crtc: CRTC in question | |
1013 | * | |
1014 | * Caller must hold event lock. | |
1015 | */ | |
778c9026 LP |
1016 | void drm_vblank_off(struct drm_device *dev, int crtc) |
1017 | { | |
498548ec CJHR |
1018 | struct drm_pending_vblank_event *e, *t; |
1019 | struct timeval now; | |
778c9026 | 1020 | unsigned long irqflags; |
498548ec | 1021 | unsigned int seq; |
778c9026 LP |
1022 | |
1023 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
27641c3f | 1024 | vblank_disable_and_save(dev, crtc); |
778c9026 | 1025 | DRM_WAKEUP(&dev->vbl_queue[crtc]); |
498548ec CJHR |
1026 | |
1027 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
1028 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
e7783ba3 ID |
1029 | |
1030 | spin_lock(&dev->event_lock); | |
498548ec CJHR |
1031 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
1032 | if (e->pipe != crtc) | |
1033 | continue; | |
1034 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
1035 | wanted %d, current %d\n", | |
1036 | e->event.sequence, seq); | |
c6eefa17 | 1037 | list_del(&e->base.link); |
498548ec | 1038 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1039 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1040 | } |
e7783ba3 | 1041 | spin_unlock(&dev->event_lock); |
498548ec | 1042 | |
778c9026 LP |
1043 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1044 | } | |
1045 | EXPORT_SYMBOL(drm_vblank_off); | |
1046 | ||
f453ba04 DA |
1047 | /** |
1048 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1049 | * @dev: DRM device | |
1050 | * @crtc: CRTC in question | |
f453ba04 DA |
1051 | * |
1052 | * Account for vblank events across mode setting events, which will likely | |
1053 | * reset the hardware frame counter. | |
1054 | */ | |
1055 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
1056 | { | |
e77cef9c JG |
1057 | /* vblank is not initialized (IRQ not installed ?) */ |
1058 | if (!dev->num_crtcs) | |
1059 | return; | |
f453ba04 DA |
1060 | /* |
1061 | * To avoid all the problems that might happen if interrupts | |
1062 | * were enabled/disabled around or between these calls, we just | |
1063 | * have the kernel take a reference on the CRTC (just once though | |
1064 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1065 | * so that interrupts remain enabled in the interim. | |
1066 | */ | |
1067 | if (!dev->vblank_inmodeset[crtc]) { | |
b3f5e732 CW |
1068 | dev->vblank_inmodeset[crtc] = 0x1; |
1069 | if (drm_vblank_get(dev, crtc) == 0) | |
1070 | dev->vblank_inmodeset[crtc] |= 0x2; | |
f453ba04 DA |
1071 | } |
1072 | } | |
1073 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1074 | ||
1075 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) | |
1076 | { | |
1077 | unsigned long irqflags; | |
1078 | ||
1079 | if (dev->vblank_inmodeset[crtc]) { | |
1080 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1081 | dev->vblank_disable_allowed = 1; | |
f453ba04 | 1082 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 CW |
1083 | |
1084 | if (dev->vblank_inmodeset[crtc] & 0x2) | |
1085 | drm_vblank_put(dev, crtc); | |
1086 | ||
1087 | dev->vblank_inmodeset[crtc] = 0; | |
f453ba04 DA |
1088 | } |
1089 | } | |
1090 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1091 | ||
0a3e67a4 JB |
1092 | /** |
1093 | * drm_modeset_ctl - handle vblank event counter changes across mode switch | |
1094 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1095 | * | |
1096 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1097 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1098 | * | |
1099 | * Generally the counter will reset across mode sets. If interrupts are | |
1100 | * enabled around this call, we don't have to do anything since the counter | |
1101 | * will have already been incremented. | |
1102 | */ | |
1103 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1104 | struct drm_file *file_priv) | |
1105 | { | |
1106 | struct drm_modeset_ctl *modeset = data; | |
19227561 | 1107 | unsigned int crtc; |
0a3e67a4 JB |
1108 | |
1109 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1110 | if (!dev->num_crtcs) | |
4a1b0714 | 1111 | return 0; |
0a3e67a4 | 1112 | |
29935554 LP |
1113 | /* KMS drivers handle this internally */ |
1114 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1115 | return 0; | |
1116 | ||
0a3e67a4 | 1117 | crtc = modeset->crtc; |
4a1b0714 LP |
1118 | if (crtc >= dev->num_crtcs) |
1119 | return -EINVAL; | |
0a3e67a4 | 1120 | |
0a3e67a4 JB |
1121 | switch (modeset->cmd) { |
1122 | case _DRM_PRE_MODESET: | |
f453ba04 | 1123 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1124 | break; |
1125 | case _DRM_POST_MODESET: | |
f453ba04 | 1126 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1127 | break; |
1128 | default: | |
4a1b0714 | 1129 | return -EINVAL; |
0a3e67a4 JB |
1130 | } |
1131 | ||
4a1b0714 | 1132 | return 0; |
0a3e67a4 JB |
1133 | } |
1134 | ||
c9a9c5e0 KH |
1135 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1136 | union drm_wait_vblank *vblwait, | |
1137 | struct drm_file *file_priv) | |
1138 | { | |
1139 | struct drm_pending_vblank_event *e; | |
1140 | struct timeval now; | |
1141 | unsigned long flags; | |
1142 | unsigned int seq; | |
ea5d552c | 1143 | int ret; |
c9a9c5e0 KH |
1144 | |
1145 | e = kzalloc(sizeof *e, GFP_KERNEL); | |
ea5d552c CW |
1146 | if (e == NULL) { |
1147 | ret = -ENOMEM; | |
1148 | goto err_put; | |
1149 | } | |
c9a9c5e0 KH |
1150 | |
1151 | e->pipe = pipe; | |
b9c2c9ae | 1152 | e->base.pid = current->pid; |
c9a9c5e0 KH |
1153 | e->event.base.type = DRM_EVENT_VBLANK; |
1154 | e->event.base.length = sizeof e->event; | |
1155 | e->event.user_data = vblwait->request.signal; | |
1156 | e->base.event = &e->event.base; | |
1157 | e->base.file_priv = file_priv; | |
1158 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1159 | ||
c9a9c5e0 KH |
1160 | spin_lock_irqsave(&dev->event_lock, flags); |
1161 | ||
1162 | if (file_priv->event_space < sizeof e->event) { | |
ea5d552c CW |
1163 | ret = -EBUSY; |
1164 | goto err_unlock; | |
c9a9c5e0 KH |
1165 | } |
1166 | ||
1167 | file_priv->event_space -= sizeof e->event; | |
27641c3f MK |
1168 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1169 | ||
c9a9c5e0 KH |
1170 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1171 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1172 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1173 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1174 | } |
1175 | ||
1176 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1177 | vblwait->request.sequence, seq, pipe); | |
1178 | ||
b9c2c9ae JB |
1179 | trace_drm_vblank_event_queued(current->pid, pipe, |
1180 | vblwait->request.sequence); | |
1181 | ||
c9a9c5e0 KH |
1182 | e->event.sequence = vblwait->request.sequence; |
1183 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1184 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1185 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1186 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1187 | } else { |
a6778e9e | 1188 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1189 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1190 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1191 | } |
1192 | ||
1193 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1194 | ||
1195 | return 0; | |
ea5d552c CW |
1196 | |
1197 | err_unlock: | |
1198 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1199 | kfree(e); | |
1200 | err_put: | |
6f331623 | 1201 | drm_vblank_put(dev, pipe); |
ea5d552c | 1202 | return ret; |
c9a9c5e0 KH |
1203 | } |
1204 | ||
1da177e4 LT |
1205 | /** |
1206 | * Wait for VBLANK. | |
1207 | * | |
1208 | * \param inode device inode. | |
6c340eac | 1209 | * \param file_priv DRM file private. |
1da177e4 LT |
1210 | * \param cmd command. |
1211 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1212 | * \return zero on success or a negative number on failure. | |
1213 | * | |
30b23634 EA |
1214 | * This function enables the vblank interrupt on the pipe requested, then |
1215 | * sleeps waiting for the requested sequence number to occur, and drops | |
1216 | * the vblank interrupt refcount afterwards. (vblank irq disable follows that | |
1217 | * after a timeout with no further vblank waits scheduled). | |
1da177e4 | 1218 | */ |
0a3e67a4 JB |
1219 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1220 | struct drm_file *file_priv) | |
1da177e4 | 1221 | { |
c153f45f | 1222 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1223 | int ret; |
19b01b5f | 1224 | unsigned int flags, seq, crtc, high_crtc; |
1da177e4 | 1225 | |
03f6509d TR |
1226 | if (drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
1227 | if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled)) | |
1228 | return -EINVAL; | |
1da177e4 | 1229 | |
30b23634 EA |
1230 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1231 | return -EINVAL; | |
1232 | ||
c153f45f | 1233 | if (vblwait->request.type & |
19b01b5f IH |
1234 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1235 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1236 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1237 | vblwait->request.type, |
19b01b5f IH |
1238 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1239 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MD |
1240 | return -EINVAL; |
1241 | } | |
1242 | ||
c153f45f | 1243 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
19b01b5f IH |
1244 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1245 | if (high_crtc) | |
1246 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1247 | else | |
1248 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
0a3e67a4 | 1249 | if (crtc >= dev->num_crtcs) |
776c9443 MD |
1250 | return -EINVAL; |
1251 | ||
0a3e67a4 JB |
1252 | ret = drm_vblank_get(dev, crtc); |
1253 | if (ret) { | |
8d3457ec | 1254 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1255 | return ret; |
1256 | } | |
1257 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1258 | |
c153f45f | 1259 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1260 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1261 | vblwait->request.sequence += seq; |
1262 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1263 | case _DRM_VBLANK_ABSOLUTE: |
1264 | break; | |
1265 | default: | |
0a3e67a4 JB |
1266 | ret = -EINVAL; |
1267 | goto done; | |
1da177e4 LT |
1268 | } |
1269 | ||
a6778e9e IH |
1270 | if (flags & _DRM_VBLANK_EVENT) { |
1271 | /* must hold on to the vblank ref until the event fires | |
1272 | * drm_vblank_put will be called asynchronously | |
1273 | */ | |
c9a9c5e0 | 1274 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); |
a6778e9e | 1275 | } |
c9a9c5e0 | 1276 | |
ab285d74 | 1277 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1278 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1279 | vblwait->request.sequence = seq + 1; | |
ab285d74 MD |
1280 | } |
1281 | ||
30b23634 EA |
1282 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1283 | vblwait->request.sequence, crtc); | |
1284 | dev->last_vblank_wait[crtc] = vblwait->request.sequence; | |
1285 | DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ, | |
1286 | (((drm_vblank_count(dev, crtc) - | |
1287 | vblwait->request.sequence) <= (1 << 23)) || | |
1288 | !dev->irq_enabled)); | |
1da177e4 | 1289 | |
30b23634 EA |
1290 | if (ret != -EINTR) { |
1291 | struct timeval now; | |
1da177e4 | 1292 | |
27641c3f | 1293 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1294 | vblwait->reply.tval_sec = now.tv_sec; |
1295 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1296 | |
30b23634 EA |
1297 | DRM_DEBUG("returning %d to client\n", |
1298 | vblwait->reply.sequence); | |
1da177e4 | 1299 | } else { |
30b23634 | 1300 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1301 | } |
1302 | ||
0a3e67a4 JB |
1303 | done: |
1304 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1305 | return ret; |
1306 | } | |
1307 | ||
ea7f7abc | 1308 | static void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
c9a9c5e0 KH |
1309 | { |
1310 | struct drm_pending_vblank_event *e, *t; | |
1311 | struct timeval now; | |
1312 | unsigned long flags; | |
1313 | unsigned int seq; | |
1314 | ||
27641c3f | 1315 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1316 | |
1317 | spin_lock_irqsave(&dev->event_lock, flags); | |
1318 | ||
1319 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1320 | if (e->pipe != crtc) | |
1321 | continue; | |
1322 | if ((seq - e->event.sequence) > (1<<23)) | |
1323 | continue; | |
1324 | ||
1325 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1326 | e->event.sequence, seq); | |
1327 | ||
c6eefa17 | 1328 | list_del(&e->base.link); |
c9a9c5e0 | 1329 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1330 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1331 | } |
1332 | ||
1333 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
ac2874b9 JB |
1334 | |
1335 | trace_drm_vblank_event(crtc, seq); | |
c9a9c5e0 KH |
1336 | } |
1337 | ||
0a3e67a4 JB |
1338 | /** |
1339 | * drm_handle_vblank - handle a vblank event | |
1340 | * @dev: DRM device | |
1341 | * @crtc: where this event occurred | |
1342 | * | |
1343 | * Drivers should call this routine in their vblank interrupt handlers to | |
1344 | * update the vblank counter and send any signals that may be pending. | |
1345 | */ | |
78c6e170 | 1346 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1347 | { |
27641c3f MK |
1348 | u32 vblcount; |
1349 | s64 diff_ns; | |
1350 | struct timeval tvblank; | |
1351 | unsigned long irqflags; | |
1352 | ||
c9a9c5e0 | 1353 | if (!dev->num_crtcs) |
78c6e170 | 1354 | return false; |
c9a9c5e0 | 1355 | |
27641c3f MK |
1356 | /* Need timestamp lock to prevent concurrent execution with |
1357 | * vblank enable/disable, as this would cause inconsistent | |
1358 | * or corrupted timestamps and vblank counts. | |
1359 | */ | |
1360 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
1361 | ||
1362 | /* Vblank irq handling disabled. Nothing to do. */ | |
1363 | if (!dev->vblank_enabled[crtc]) { | |
1364 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
78c6e170 | 1365 | return false; |
27641c3f MK |
1366 | } |
1367 | ||
1368 | /* Fetch corresponding timestamp for this vblank interval from | |
1369 | * driver and store it in proper slot of timestamp ringbuffer. | |
1370 | */ | |
1371 | ||
1372 | /* Get current timestamp and count. */ | |
1373 | vblcount = atomic_read(&dev->_vblank_count[crtc]); | |
1374 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); | |
1375 | ||
1376 | /* Compute time difference to timestamp of last vblank */ | |
1377 | diff_ns = timeval_to_ns(&tvblank) - | |
1378 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1379 | ||
1380 | /* Update vblank timestamp and count if at least | |
1381 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1382 | * difference between last stored timestamp and current | |
1383 | * timestamp. A smaller difference means basically | |
1384 | * identical timestamps. Happens if this vblank has | |
1385 | * been already processed and this is a redundant call, | |
1386 | * e.g., due to spurious vblank interrupts. We need to | |
1387 | * ignore those for accounting. | |
1388 | */ | |
c4cc3839 | 1389 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { |
27641c3f MK |
1390 | /* Store new timestamp in ringbuffer. */ |
1391 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
27641c3f MK |
1392 | |
1393 | /* Increment cooked vblank count. This also atomically commits | |
1394 | * the timestamp computed above. | |
1395 | */ | |
bc215128 | 1396 | smp_mb__before_atomic_inc(); |
27641c3f | 1397 | atomic_inc(&dev->_vblank_count[crtc]); |
bc215128 | 1398 | smp_mb__after_atomic_inc(); |
27641c3f MK |
1399 | } else { |
1400 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", | |
1401 | crtc, (int) diff_ns); | |
1402 | } | |
1403 | ||
0a3e67a4 | 1404 | DRM_WAKEUP(&dev->vbl_queue[crtc]); |
c9a9c5e0 | 1405 | drm_handle_vblank_events(dev, crtc); |
27641c3f MK |
1406 | |
1407 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
78c6e170 | 1408 | return true; |
0a3e67a4 JB |
1409 | } |
1410 | EXPORT_SYMBOL(drm_handle_vblank); |