Commit | Line | Data |
---|---|---|
f5752b38 DV |
1 | /* |
2 | * drm_irq.c IRQ and vblank support | |
1da177e4 LT |
3 | * |
4 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
5 | * \author Gareth Hughes <gareth@valinux.com> | |
6 | */ | |
7 | ||
8 | /* | |
9 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com | |
10 | * | |
11 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
12 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
13 | * All Rights Reserved. | |
14 | * | |
15 | * Permission is hereby granted, free of charge, to any person obtaining a | |
16 | * copy of this software and associated documentation files (the "Software"), | |
17 | * to deal in the Software without restriction, including without limitation | |
18 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
19 | * and/or sell copies of the Software, and to permit persons to whom the | |
20 | * Software is furnished to do so, subject to the following conditions: | |
21 | * | |
22 | * The above copyright notice and this permission notice (including the next | |
23 | * paragraph) shall be included in all copies or substantial portions of the | |
24 | * Software. | |
25 | * | |
26 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
27 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
28 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
29 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
30 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
31 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
32 | * OTHER DEALINGS IN THE SOFTWARE. | |
33 | */ | |
34 | ||
760285e7 | 35 | #include <drm/drmP.h> |
ac2874b9 | 36 | #include "drm_trace.h" |
18882995 | 37 | #include "drm_internal.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. */ | |
cc1ef118 TR |
46 | #define vblanktimestamp(dev, pipe, count) \ |
47 | ((dev)->vblank[pipe].time[(count) % DRM_VBLANKTIME_RBSIZE]) | |
27641c3f MK |
48 | |
49 | /* Retry timestamp calculation up to 3 times to satisfy | |
50 | * drm_timestamp_precision before giving up. | |
51 | */ | |
52 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
53 | ||
54 | /* Threshold in nanoseconds for detection of redundant | |
55 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
56 | */ | |
57 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
58 | ||
fb446a1a | 59 | static bool |
cc1ef118 | 60 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a DV |
61 | struct timeval *tvblank, unsigned flags); |
62 | ||
18882995 DV |
63 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ |
64 | ||
65 | /* | |
66 | * Default to use monotonic timestamps for wait-for-vblank and page-flip | |
67 | * complete events. | |
68 | */ | |
69 | unsigned int drm_timestamp_monotonic = 1; | |
70 | ||
71 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ | |
72 | ||
73 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
74 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
75 | module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600); | |
76 | ||
99264a61 | 77 | static void store_vblank(struct drm_device *dev, int crtc, |
209e4dbc | 78 | u32 vblank_count_inc, |
99264a61 DV |
79 | struct timeval *t_vblank) |
80 | { | |
81 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; | |
82 | u32 tslot; | |
83 | ||
84 | assert_spin_locked(&dev->vblank_time_lock); | |
85 | ||
86 | if (t_vblank) { | |
87 | /* All writers hold the spinlock, but readers are serialized by | |
88 | * the latching of vblank->count below. | |
89 | */ | |
90 | tslot = vblank->count + vblank_count_inc; | |
91 | vblanktimestamp(dev, crtc, tslot) = *t_vblank; | |
92 | } | |
93 | ||
94 | /* | |
95 | * vblank timestamp updates are protected on the write side with | |
96 | * vblank_time_lock, but on the read side done locklessly using a | |
97 | * sequence-lock on the vblank counter. Ensure correct ordering using | |
98 | * memory barrriers. We need the barrier both before and also after the | |
99 | * counter update to synchronize with the next timestamp write. | |
100 | * The read-side barriers for this are in drm_vblank_count_and_time. | |
101 | */ | |
102 | smp_wmb(); | |
103 | vblank->count += vblank_count_inc; | |
104 | smp_wmb(); | |
105 | } | |
106 | ||
13b030af VS |
107 | /** |
108 | * drm_update_vblank_count - update the master vblank counter | |
109 | * @dev: DRM device | |
cc1ef118 | 110 | * @pipe: counter to update |
13b030af VS |
111 | * |
112 | * Call back into the driver to update the appropriate vblank counter | |
113 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
114 | * update the last read value so we can deal with wraparound on the next | |
115 | * call if necessary. | |
116 | * | |
117 | * Only necessary when going from off->on, to account for frames we | |
118 | * didn't get an interrupt for. | |
119 | * | |
120 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
121 | * device vblank fields. | |
122 | */ | |
cc1ef118 | 123 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe) |
13b030af | 124 | { |
cc1ef118 | 125 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
99264a61 | 126 | u32 cur_vblank, diff; |
fb446a1a | 127 | bool rc; |
13b030af VS |
128 | struct timeval t_vblank; |
129 | ||
130 | /* | |
131 | * Interrupts were disabled prior to this call, so deal with counter | |
132 | * wrap if needed. | |
5ceecb2f | 133 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events |
13b030af VS |
134 | * here if the register is small or we had vblank interrupts off for |
135 | * a long time. | |
136 | * | |
137 | * We repeat the hardware vblank counter & timestamp query until | |
138 | * we get consistent results. This to prevent races between gpu | |
139 | * updating its hardware counter while we are retrieving the | |
140 | * corresponding vblank timestamp. | |
141 | */ | |
142 | do { | |
cc1ef118 TR |
143 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); |
144 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0); | |
145 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe)); | |
13b030af VS |
146 | |
147 | /* Deal with counter wrap */ | |
8a51d5be VS |
148 | diff = cur_vblank - vblank->last; |
149 | if (cur_vblank < vblank->last) { | |
5ceecb2f | 150 | diff += dev->max_vblank_count + 1; |
13b030af | 151 | |
cc1ef118 TR |
152 | DRM_DEBUG("last_vblank[%u]=0x%x, cur_vblank=0x%x => diff=0x%x\n", |
153 | pipe, vblank->last, cur_vblank, diff); | |
13b030af VS |
154 | } |
155 | ||
cc1ef118 TR |
156 | DRM_DEBUG("updating vblank count on crtc %u, missed %d\n", |
157 | pipe, diff); | |
13b030af | 158 | |
da8f4396 MK |
159 | if (diff == 0) |
160 | return; | |
161 | ||
99264a61 DV |
162 | /* |
163 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
d66a1e38 MK |
164 | * available and didn't fail. Otherwise reinitialize delayed at next vblank |
165 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
13b030af | 166 | */ |
d66a1e38 MK |
167 | if (!rc) |
168 | t_vblank = (struct timeval) {0, 0}; | |
169 | ||
cc1ef118 | 170 | store_vblank(dev, pipe, diff, &t_vblank); |
13b030af VS |
171 | } |
172 | ||
27641c3f MK |
173 | /* |
174 | * Disable vblank irq's on crtc, make sure that last vblank count | |
175 | * of hardware and corresponding consistent software vblank counter | |
176 | * are preserved, even if there are any spurious vblank irq's after | |
177 | * disable. | |
178 | */ | |
cc1ef118 | 179 | static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) |
27641c3f | 180 | { |
cc1ef118 | 181 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f MK |
182 | unsigned long irqflags; |
183 | u32 vblcount; | |
184 | s64 diff_ns; | |
fb446a1a | 185 | bool vblrc; |
27641c3f | 186 | struct timeval tvblank; |
0355cf3a | 187 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
188 | |
189 | /* Prevent vblank irq processing while disabling vblank irqs, | |
190 | * so no updates of timestamps or count can happen after we've | |
191 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 192 | */ |
27641c3f MK |
193 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
194 | ||
812e7465 | 195 | /* |
393e872e | 196 | * If the vblank interrupt was already disabled update the count |
812e7465 VS |
197 | * and timestamp to maintain the appearance that the counter |
198 | * has been ticking all along until this time. This makes the | |
199 | * count account for the entire time between drm_vblank_on() and | |
200 | * drm_vblank_off(). | |
855d30b4 DV |
201 | * |
202 | * But only do this if precise vblank timestamps are available. | |
203 | * Otherwise we might read a totally bogus timestamp since drivers | |
204 | * lacking precise timestamp support rely upon sampling the system clock | |
205 | * at vblank interrupt time. Which obviously won't work out well if the | |
206 | * vblank interrupt is disabled. | |
812e7465 | 207 | */ |
855d30b4 | 208 | if (!vblank->enabled && |
cc1ef118 TR |
209 | drm_get_last_vbltimestamp(dev, pipe, &tvblank, 0)) { |
210 | drm_update_vblank_count(dev, pipe); | |
812e7465 VS |
211 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
212 | return; | |
213 | } | |
214 | ||
eb2ed66f LP |
215 | /* |
216 | * Only disable vblank interrupts if they're enabled. This avoids | |
217 | * calling the ->disable_vblank() operation in atomic context with the | |
218 | * hardware potentially runtime suspended. | |
219 | */ | |
220 | if (vblank->enabled) { | |
cc1ef118 | 221 | dev->driver->disable_vblank(dev, pipe); |
eb2ed66f LP |
222 | vblank->enabled = false; |
223 | } | |
27641c3f MK |
224 | |
225 | /* No further vblank irq's will be processed after | |
226 | * this point. Get current hardware vblank count and | |
227 | * vblank timestamp, repeat until they are consistent. | |
228 | * | |
229 | * FIXME: There is still a race condition here and in | |
230 | * drm_update_vblank_count() which can cause off-by-one | |
231 | * reinitialization of software vblank counter. If gpu | |
232 | * vblank counter doesn't increment exactly at the leading | |
233 | * edge of a vblank interval, then we can lose 1 count if | |
234 | * we happen to execute between start of vblank and the | |
235 | * delayed gpu counter increment. | |
236 | */ | |
237 | do { | |
cc1ef118 TR |
238 | vblank->last = dev->driver->get_vblank_counter(dev, pipe); |
239 | vblrc = drm_get_last_vbltimestamp(dev, pipe, &tvblank, 0); | |
240 | } while (vblank->last != dev->driver->get_vblank_counter(dev, pipe) && (--count) && vblrc); | |
0355cf3a EE |
241 | |
242 | if (!count) | |
243 | vblrc = 0; | |
27641c3f MK |
244 | |
245 | /* Compute time difference to stored timestamp of last vblank | |
246 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
247 | */ | |
99264a61 | 248 | vblcount = vblank->count; |
27641c3f | 249 | diff_ns = timeval_to_ns(&tvblank) - |
cc1ef118 | 250 | timeval_to_ns(&vblanktimestamp(dev, pipe, vblcount)); |
27641c3f MK |
251 | |
252 | /* If there is at least 1 msec difference between the last stored | |
253 | * timestamp and tvblank, then we are currently executing our | |
254 | * disable inside a new vblank interval, the tvblank timestamp | |
255 | * corresponds to this new vblank interval and the irq handler | |
256 | * for this vblank didn't run yet and won't run due to our disable. | |
257 | * Therefore we need to do the job of drm_handle_vblank() and | |
258 | * increment the vblank counter by one to account for this vblank. | |
259 | * | |
260 | * Skip this step if there isn't any high precision timestamp | |
261 | * available. In that case we can't account for this and just | |
262 | * hope for the best. | |
263 | */ | |
99264a61 | 264 | if (vblrc && (abs64(diff_ns) > 1000000)) |
cc1ef118 | 265 | store_vblank(dev, pipe, 1, &tvblank); |
27641c3f | 266 | |
27641c3f | 267 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
268 | } |
269 | ||
0a3e67a4 JB |
270 | static void vblank_disable_fn(unsigned long arg) |
271 | { | |
e69595c2 VS |
272 | struct drm_vblank_crtc *vblank = (void *)arg; |
273 | struct drm_device *dev = vblank->dev; | |
cc1ef118 | 274 | unsigned int pipe = vblank->pipe; |
0a3e67a4 | 275 | unsigned long irqflags; |
0a3e67a4 JB |
276 | |
277 | if (!dev->vblank_disable_allowed) | |
278 | return; | |
279 | ||
e69595c2 VS |
280 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
281 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
cc1ef118 TR |
282 | DRM_DEBUG("disabling vblank on crtc %u\n", pipe); |
283 | vblank_disable_and_save(dev, pipe); | |
0a3e67a4 | 284 | } |
e69595c2 | 285 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
286 | } |
287 | ||
f5752b38 DV |
288 | /** |
289 | * drm_vblank_cleanup - cleanup vblank support | |
290 | * @dev: DRM device | |
291 | * | |
292 | * This function cleans up any resources allocated in drm_vblank_init. | |
293 | */ | |
52440211 | 294 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 295 | { |
cc1ef118 | 296 | unsigned int pipe; |
e69595c2 | 297 | |
0a3e67a4 JB |
298 | /* Bail if the driver didn't call drm_vblank_init() */ |
299 | if (dev->num_crtcs == 0) | |
300 | return; | |
301 | ||
cc1ef118 TR |
302 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { |
303 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
8a51d5be | 304 | |
3bff93d6 DV |
305 | WARN_ON(vblank->enabled && |
306 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
2368ffb1 | 307 | |
3bff93d6 | 308 | del_timer_sync(&vblank->disable_timer); |
e69595c2 | 309 | } |
0a3e67a4 | 310 | |
5380e929 | 311 | kfree(dev->vblank); |
0a3e67a4 JB |
312 | |
313 | dev->num_crtcs = 0; | |
314 | } | |
e77cef9c | 315 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 316 | |
f5752b38 DV |
317 | /** |
318 | * drm_vblank_init - initialize vblank support | |
cc1ef118 TR |
319 | * @dev: DRM device |
320 | * @num_crtcs: number of CRTCs supported by @dev | |
f5752b38 DV |
321 | * |
322 | * This function initializes vblank support for @num_crtcs display pipelines. | |
323 | * | |
324 | * Returns: | |
325 | * Zero on success or a negative error code on failure. | |
326 | */ | |
cc1ef118 | 327 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) |
0a3e67a4 | 328 | { |
cc1ef118 TR |
329 | int ret = -ENOMEM; |
330 | unsigned int i; | |
0a3e67a4 | 331 | |
0a3e67a4 | 332 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
333 | spin_lock_init(&dev->vblank_time_lock); |
334 | ||
0a3e67a4 JB |
335 | dev->num_crtcs = num_crtcs; |
336 | ||
5380e929 VS |
337 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
338 | if (!dev->vblank) | |
0a3e67a4 JB |
339 | goto err; |
340 | ||
e69595c2 | 341 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
342 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
343 | ||
344 | vblank->dev = dev; | |
cc1ef118 | 345 | vblank->pipe = i; |
8a51d5be VS |
346 | init_waitqueue_head(&vblank->queue); |
347 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
348 | (unsigned long)vblank); | |
e69595c2 | 349 | } |
27641c3f | 350 | |
8f6fce03 | 351 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
352 | |
353 | /* Driver specific high-precision vblank timestamping supported? */ | |
354 | if (dev->driver->get_vblank_timestamp) | |
355 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
356 | else | |
357 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
358 | ||
5a8b21b2 MK |
359 | /* Must have precise timestamping for reliable vblank instant disable */ |
360 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
361 | dev->vblank_disable_immediate = false; | |
362 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
363 | "get_vblank_timestamp == NULL\n"); | |
364 | } | |
365 | ||
ba0bf120 VS |
366 | dev->vblank_disable_allowed = false; |
367 | ||
0a3e67a4 JB |
368 | return 0; |
369 | ||
370 | err: | |
79a093ae | 371 | dev->num_crtcs = 0; |
0a3e67a4 JB |
372 | return ret; |
373 | } | |
374 | EXPORT_SYMBOL(drm_vblank_init); | |
375 | ||
28d52043 DA |
376 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
377 | { | |
378 | struct drm_device *dev = cookie; | |
379 | ||
380 | if (dev->driver->vgaarb_irq) { | |
381 | dev->driver->vgaarb_irq(dev, state); | |
382 | return; | |
383 | } | |
384 | ||
385 | if (!dev->irq_enabled) | |
386 | return; | |
387 | ||
5037f8ac JS |
388 | if (state) { |
389 | if (dev->driver->irq_uninstall) | |
390 | dev->driver->irq_uninstall(dev); | |
391 | } else { | |
392 | if (dev->driver->irq_preinstall) | |
393 | dev->driver->irq_preinstall(dev); | |
394 | if (dev->driver->irq_postinstall) | |
395 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
396 | } |
397 | } | |
398 | ||
1da177e4 | 399 | /** |
f5752b38 DV |
400 | * drm_irq_install - install IRQ handler |
401 | * @dev: DRM device | |
402 | * @irq: IRQ number to install the handler for | |
1da177e4 | 403 | * |
0a3e67a4 | 404 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
405 | * irq_preinstall() and irq_postinstall() functions before and after the |
406 | * installation. | |
407 | * | |
408 | * This is the simplified helper interface provided for drivers with no special | |
409 | * needs. Drivers which need to install interrupt handlers for multiple | |
410 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
411 | * that vblank interrupts are available. | |
412 | * | |
413 | * Returns: | |
414 | * Zero on success or a negative error code on failure. | |
1da177e4 | 415 | */ |
bb0f1b5c | 416 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 417 | { |
4a1b0714 | 418 | int ret; |
b5e89ed5 | 419 | unsigned long sh_flags = 0; |
1da177e4 LT |
420 | |
421 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
422 | return -EINVAL; | |
423 | ||
7c1a38e3 | 424 | if (irq == 0) |
1da177e4 LT |
425 | return -EINVAL; |
426 | ||
1da177e4 | 427 | /* Driver must have been initialized */ |
e090c53b | 428 | if (!dev->dev_private) |
1da177e4 | 429 | return -EINVAL; |
1da177e4 | 430 | |
e090c53b | 431 | if (dev->irq_enabled) |
1da177e4 | 432 | return -EBUSY; |
4423843c | 433 | dev->irq_enabled = true; |
1da177e4 | 434 | |
7c1a38e3 | 435 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 436 | |
b5e89ed5 | 437 | /* Before installing handler */ |
5037f8ac JS |
438 | if (dev->driver->irq_preinstall) |
439 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 440 | |
b5e89ed5 | 441 | /* Install handler */ |
1da177e4 | 442 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 443 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 444 | |
7c1a38e3 | 445 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 446 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 447 | |
b5e89ed5 | 448 | if (ret < 0) { |
4423843c | 449 | dev->irq_enabled = false; |
1da177e4 LT |
450 | return ret; |
451 | } | |
452 | ||
28d52043 DA |
453 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
454 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
455 | ||
b5e89ed5 | 456 | /* After installing handler */ |
5037f8ac JS |
457 | if (dev->driver->irq_postinstall) |
458 | ret = dev->driver->irq_postinstall(dev); | |
459 | ||
0a3e67a4 | 460 | if (ret < 0) { |
4423843c | 461 | dev->irq_enabled = false; |
e1c44acc JS |
462 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
463 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
7c1a38e3 DV |
464 | free_irq(irq, dev); |
465 | } else { | |
466 | dev->irq = irq; | |
0a3e67a4 | 467 | } |
1da177e4 | 468 | |
0a3e67a4 | 469 | return ret; |
1da177e4 | 470 | } |
0a3e67a4 | 471 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
472 | |
473 | /** | |
f5752b38 DV |
474 | * drm_irq_uninstall - uninstall the IRQ handler |
475 | * @dev: DRM device | |
476 | * | |
477 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
478 | * This should only be called by drivers which used drm_irq_install() to set up | |
479 | * their interrupt handler. Other drivers must only reset | |
480 | * drm_device->irq_enabled to false. | |
1da177e4 | 481 | * |
f5752b38 DV |
482 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
483 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
484 | * the same function through an ioctl. | |
1da177e4 | 485 | * |
f5752b38 DV |
486 | * Returns: |
487 | * Zero on success or a negative error code on failure. | |
1da177e4 | 488 | */ |
27641c3f | 489 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 490 | { |
dc1336ff | 491 | unsigned long irqflags; |
4423843c VS |
492 | bool irq_enabled; |
493 | int i; | |
1da177e4 LT |
494 | |
495 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
496 | return -EINVAL; | |
497 | ||
1da177e4 | 498 | irq_enabled = dev->irq_enabled; |
4423843c | 499 | dev->irq_enabled = false; |
1da177e4 | 500 | |
dc1336ff | 501 | /* |
3bff93d6 DV |
502 | * Wake up any waiters so they don't hang. This is just to paper over |
503 | * isssues for UMS drivers which aren't in full control of their | |
504 | * vblank/irq handling. KMS drivers must ensure that vblanks are all | |
505 | * disabled when uninstalling the irq handler. | |
dc1336ff | 506 | */ |
bde4889a BS |
507 | if (dev->num_crtcs) { |
508 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
509 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
510 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
511 | ||
3bff93d6 DV |
512 | if (!vblank->enabled) |
513 | continue; | |
514 | ||
515 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
516 | ||
517 | vblank_disable_and_save(dev, i); | |
8a51d5be | 518 | wake_up(&vblank->queue); |
bde4889a BS |
519 | } |
520 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 521 | } |
dc1336ff | 522 | |
b5e89ed5 | 523 | if (!irq_enabled) |
1da177e4 LT |
524 | return -EINVAL; |
525 | ||
7c1a38e3 | 526 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 527 | |
28d52043 DA |
528 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
529 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
530 | ||
5037f8ac JS |
531 | if (dev->driver->irq_uninstall) |
532 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 533 | |
7c1a38e3 | 534 | free_irq(dev->irq, dev); |
1da177e4 LT |
535 | |
536 | return 0; | |
537 | } | |
538 | EXPORT_SYMBOL(drm_irq_uninstall); | |
539 | ||
f5752b38 | 540 | /* |
1da177e4 LT |
541 | * IRQ control ioctl. |
542 | * | |
543 | * \param inode device inode. | |
6c340eac | 544 | * \param file_priv DRM file private. |
1da177e4 LT |
545 | * \param cmd command. |
546 | * \param arg user argument, pointing to a drm_control structure. | |
547 | * \return zero on success or a negative number on failure. | |
548 | * | |
549 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
550 | */ | |
c153f45f EA |
551 | int drm_control(struct drm_device *dev, void *data, |
552 | struct drm_file *file_priv) | |
1da177e4 | 553 | { |
c153f45f | 554 | struct drm_control *ctl = data; |
a319c1a4 | 555 | int ret = 0, irq; |
b5e89ed5 | 556 | |
27641c3f MK |
557 | /* if we haven't irq we fallback for compatibility reasons - |
558 | * this used to be a separate function in drm_dma.h | |
559 | */ | |
1da177e4 | 560 | |
22471cf6 DV |
561 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
562 | return 0; | |
563 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
564 | return 0; | |
565 | /* UMS was only ever support on pci devices. */ | |
566 | if (WARN_ON(!dev->pdev)) | |
567 | return -EINVAL; | |
1da177e4 | 568 | |
c153f45f | 569 | switch (ctl->func) { |
1da177e4 | 570 | case DRM_INST_HANDLER: |
a319c1a4 DV |
571 | irq = dev->pdev->irq; |
572 | ||
1da177e4 | 573 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 574 | ctl->irq != irq) |
1da177e4 | 575 | return -EINVAL; |
e090c53b | 576 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 577 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
578 | mutex_unlock(&dev->struct_mutex); |
579 | ||
580 | return ret; | |
1da177e4 | 581 | case DRM_UNINST_HANDLER: |
e090c53b DV |
582 | mutex_lock(&dev->struct_mutex); |
583 | ret = drm_irq_uninstall(dev); | |
584 | mutex_unlock(&dev->struct_mutex); | |
585 | ||
586 | return ret; | |
1da177e4 LT |
587 | default: |
588 | return -EINVAL; | |
589 | } | |
590 | } | |
591 | ||
27641c3f | 592 | /** |
f5752b38 DV |
593 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
594 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
595 | * @mode: display mode containing the scanout timings | |
27641c3f | 596 | * |
21b21560 VS |
597 | * Calculate and store various constants which are later |
598 | * needed by vblank and swap-completion timestamping, e.g, | |
599 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 600 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 601 | * things like panel scaling or other adjustments into account. |
27641c3f | 602 | */ |
545cdd55 VS |
603 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
604 | const struct drm_display_mode *mode) | |
27641c3f | 605 | { |
3c184f69 | 606 | int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; |
77666b72 | 607 | int dotclock = mode->crtc_clock; |
27641c3f MK |
608 | |
609 | /* Valid dotclock? */ | |
610 | if (dotclock > 0) { | |
0dae35a3 VS |
611 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
612 | ||
613 | /* | |
614 | * Convert scanline length in pixels and video | |
615 | * dot clock to line duration, frame duration | |
616 | * and pixel duration in nanoseconds: | |
27641c3f | 617 | */ |
0dae35a3 VS |
618 | pixeldur_ns = 1000000 / dotclock; |
619 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
620 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
621 | |
622 | /* | |
623 | * Fields of interlaced scanout modes are only half a frame duration. | |
624 | */ | |
625 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
626 | framedur_ns /= 2; | |
27641c3f | 627 | } else |
cc1ef118 | 628 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", |
27641c3f MK |
629 | crtc->base.id); |
630 | ||
631 | crtc->pixeldur_ns = pixeldur_ns; | |
632 | crtc->linedur_ns = linedur_ns; | |
633 | crtc->framedur_ns = framedur_ns; | |
634 | ||
cc1ef118 | 635 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", |
545cdd55 VS |
636 | crtc->base.id, mode->crtc_htotal, |
637 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
cc1ef118 | 638 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d, pixeldur %d\n", |
3c184f69 VS |
639 | crtc->base.id, dotclock, framedur_ns, |
640 | linedur_ns, pixeldur_ns); | |
27641c3f MK |
641 | } |
642 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
643 | ||
644 | /** | |
f5752b38 DV |
645 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
646 | * @dev: DRM device | |
cc1ef118 | 647 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
f5752b38 DV |
648 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
649 | * On return contains true maximum error of timestamp | |
650 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
651 | * @flags: Flags to pass to driver: | |
652 | * 0 = Default, | |
653 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
654 | * @refcrtc: CRTC which defines scanout timing | |
655 | * @mode: mode which defines the scanout timings | |
656 | * | |
657 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
658 | * timings and current video scanout position of a CRTC. This can be called from | |
659 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
660 | * actual timestamping. | |
27641c3f MK |
661 | * |
662 | * Should return timestamps conforming to the OML_sync_control OpenML | |
663 | * extension specification. The timestamp corresponds to the end of | |
664 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
665 | * pixel in the following video frame. | |
666 | * | |
667 | * Requires support for optional dev->driver->get_scanout_position() | |
668 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
669 | * that corresponds to the true scanout timing. | |
670 | * | |
671 | * The current implementation only handles standard video modes. It | |
672 | * returns as no operation if a doublescan or interlaced video mode is | |
673 | * active. Higher level code is expected to handle this. | |
674 | * | |
f5752b38 DV |
675 | * Returns: |
676 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
677 | * video mode: |
678 | * | |
f5752b38 | 679 | * -EINVAL - Invalid CRTC. |
27641c3f MK |
680 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
681 | * -ENOTSUPP - Function not supported in current display mode. | |
682 | * -EIO - Failed, e.g., due to failed scanout position query. | |
683 | * | |
684 | * Returns or'ed positive status flags on success: | |
685 | * | |
686 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
687 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
688 | * | |
689 | */ | |
cc1ef118 TR |
690 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, |
691 | unsigned int pipe, | |
27641c3f MK |
692 | int *max_error, |
693 | struct timeval *vblank_time, | |
694 | unsigned flags, | |
7da903ef VS |
695 | const struct drm_crtc *refcrtc, |
696 | const struct drm_display_mode *mode) | |
27641c3f | 697 | { |
e62f2f5a | 698 | struct timeval tv_etime; |
d2cb58c8 | 699 | ktime_t stime, etime; |
8072bfa6 | 700 | int vbl_status; |
27641c3f | 701 | int vpos, hpos, i; |
3c184f69 | 702 | int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; |
27641c3f MK |
703 | bool invbl; |
704 | ||
cc1ef118 TR |
705 | if (pipe >= dev->num_crtcs) { |
706 | DRM_ERROR("Invalid crtc %u\n", pipe); | |
27641c3f MK |
707 | return -EINVAL; |
708 | } | |
709 | ||
710 | /* Scanout position query not supported? Should not happen. */ | |
711 | if (!dev->driver->get_scanout_position) { | |
712 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
713 | return -EIO; | |
714 | } | |
715 | ||
27641c3f MK |
716 | /* Durations of frames, lines, pixels in nanoseconds. */ |
717 | framedur_ns = refcrtc->framedur_ns; | |
718 | linedur_ns = refcrtc->linedur_ns; | |
719 | pixeldur_ns = refcrtc->pixeldur_ns; | |
720 | ||
721 | /* If mode timing undefined, just return as no-op: | |
722 | * Happens during initial modesetting of a crtc. | |
723 | */ | |
8072bfa6 | 724 | if (framedur_ns == 0) { |
cc1ef118 | 725 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); |
27641c3f MK |
726 | return -EAGAIN; |
727 | } | |
728 | ||
27641c3f MK |
729 | /* Get current scanout position with system timestamp. |
730 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
731 | * if single query takes longer than max_error nanoseconds. | |
732 | * | |
733 | * This guarantees a tight bound on maximum error if | |
734 | * code gets preempted or delayed for some reason. | |
735 | */ | |
736 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
737 | /* |
738 | * Get vertical and horizontal scanout position vpos, hpos, | |
739 | * and bounding timestamps stime, etime, pre/post query. | |
740 | */ | |
cc1ef118 | 741 | vbl_status = dev->driver->get_scanout_position(dev, pipe, flags, &vpos, |
8f6fce03 | 742 | &hpos, &stime, &etime); |
27641c3f | 743 | |
27641c3f MK |
744 | /* Return as no-op if scanout query unsupported or failed. */ |
745 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
cc1ef118 TR |
746 | DRM_DEBUG("crtc %u : scanoutpos query failed [%d].\n", |
747 | pipe, vbl_status); | |
27641c3f MK |
748 | return -EIO; |
749 | } | |
750 | ||
8f6fce03 | 751 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 752 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
753 | |
754 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 755 | if (duration_ns <= *max_error) |
27641c3f MK |
756 | break; |
757 | } | |
758 | ||
759 | /* Noisy system timing? */ | |
760 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
cc1ef118 TR |
761 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", |
762 | pipe, duration_ns/1000, *max_error/1000, i); | |
27641c3f MK |
763 | } |
764 | ||
765 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 766 | *max_error = duration_ns; |
27641c3f MK |
767 | |
768 | /* Check if in vblank area: | |
769 | * vpos is >=0 in video scanout area, but negative | |
770 | * within vblank area, counting down the number of lines until | |
771 | * start of scanout. | |
772 | */ | |
3d3cbd84 | 773 | invbl = vbl_status & DRM_SCANOUTPOS_IN_VBLANK; |
27641c3f MK |
774 | |
775 | /* Convert scanout position into elapsed time at raw_time query | |
776 | * since start of scanout at first display scanline. delta_ns | |
777 | * can be negative if start of scanout hasn't happened yet. | |
778 | */ | |
3c184f69 | 779 | delta_ns = vpos * linedur_ns + hpos * pixeldur_ns; |
27641c3f | 780 | |
c61eef72 | 781 | if (!drm_timestamp_monotonic) |
d2cb58c8 | 782 | etime = ktime_mono_to_real(etime); |
c61eef72 | 783 | |
e62f2f5a ID |
784 | /* save this only for debugging purposes */ |
785 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
786 | /* Subtract time delta from raw timestamp to get final |
787 | * vblank_time timestamp for end of vblank. | |
788 | */ | |
e91abf80 MD |
789 | if (delta_ns < 0) |
790 | etime = ktime_add_ns(etime, -delta_ns); | |
791 | else | |
792 | etime = ktime_sub_ns(etime, delta_ns); | |
e62f2f5a | 793 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 794 | |
cc1ef118 TR |
795 | DRM_DEBUG("crtc %u : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
796 | pipe, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 797 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 | 798 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
3c184f69 | 799 | duration_ns/1000, i); |
27641c3f MK |
800 | |
801 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
802 | if (invbl) | |
3d3cbd84 | 803 | vbl_status |= DRM_VBLANKTIME_IN_VBLANK; |
27641c3f MK |
804 | |
805 | return vbl_status; | |
806 | } | |
807 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
808 | ||
c61eef72 ID |
809 | static struct timeval get_drm_timestamp(void) |
810 | { | |
811 | ktime_t now; | |
812 | ||
d2cb58c8 | 813 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
c61eef72 ID |
814 | return ktime_to_timeval(now); |
815 | } | |
816 | ||
27641c3f MK |
817 | /** |
818 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
4dfd909f | 819 | * vblank interval |
27641c3f | 820 | * @dev: DRM device |
cc1ef118 | 821 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
27641c3f MK |
822 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
823 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
824 | * 0 = Default, |
825 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
826 | * |
827 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 828 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
829 | * compute the timestamp with a high-precision GPU specific method. |
830 | * | |
831 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
832 | * call, i.e., it isn't very precisely locked to the true vblank. | |
833 | * | |
f5752b38 | 834 | * Returns: |
fb446a1a | 835 | * True if timestamp is considered to be very precise, false otherwise. |
27641c3f | 836 | */ |
fb446a1a | 837 | static bool |
cc1ef118 | 838 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a | 839 | struct timeval *tvblank, unsigned flags) |
27641c3f | 840 | { |
4a1b0714 | 841 | int ret; |
27641c3f MK |
842 | |
843 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
844 | int max_error = (int) drm_timestamp_precision * 1000; | |
845 | ||
846 | /* Query driver if possible and precision timestamping enabled. */ | |
847 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
cc1ef118 | 848 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, |
27641c3f MK |
849 | tvblank, flags); |
850 | if (ret > 0) | |
fb446a1a | 851 | return true; |
27641c3f MK |
852 | } |
853 | ||
854 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 855 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 856 | */ |
c61eef72 | 857 | *tvblank = get_drm_timestamp(); |
27641c3f | 858 | |
fb446a1a | 859 | return false; |
27641c3f | 860 | } |
27641c3f | 861 | |
0a3e67a4 JB |
862 | /** |
863 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
864 | * @dev: DRM device | |
cc1ef118 | 865 | * @pipe: index of CRTC for which to retrieve the counter |
0a3e67a4 JB |
866 | * |
867 | * Fetches the "cooked" vblank count value that represents the number of | |
868 | * vblank events since the system was booted, including lost events due to | |
869 | * modesetting activity. | |
f5752b38 | 870 | * |
96d3f91e TR |
871 | * This is the legacy version of drm_crtc_vblank_count(). |
872 | * | |
f5752b38 DV |
873 | * Returns: |
874 | * The software vblank counter. | |
0a3e67a4 | 875 | */ |
cc1ef118 | 876 | u32 drm_vblank_count(struct drm_device *dev, int pipe) |
0a3e67a4 | 877 | { |
cc1ef118 | 878 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 879 | |
cc1ef118 | 880 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 | 881 | return 0; |
7d1de851 | 882 | |
99264a61 | 883 | return vblank->count; |
0a3e67a4 JB |
884 | } |
885 | EXPORT_SYMBOL(drm_vblank_count); | |
886 | ||
96d3f91e TR |
887 | /** |
888 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
889 | * @crtc: which counter to retrieve | |
890 | * | |
891 | * Fetches the "cooked" vblank count value that represents the number of | |
892 | * vblank events since the system was booted, including lost events due to | |
893 | * modesetting activity. | |
894 | * | |
895 | * This is the native KMS version of drm_vblank_count(). | |
896 | * | |
897 | * Returns: | |
898 | * The software vblank counter. | |
899 | */ | |
900 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) | |
901 | { | |
902 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
903 | } | |
904 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
905 | ||
27641c3f | 906 | /** |
cc1ef118 TR |
907 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the |
908 | * system timestamp corresponding to that vblank counter value. | |
27641c3f | 909 | * @dev: DRM device |
cc1ef118 | 910 | * @pipe: index of CRTC whose counter to retrieve |
27641c3f MK |
911 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. |
912 | * | |
913 | * Fetches the "cooked" vblank count value that represents the number of | |
914 | * vblank events since the system was booted, including lost events due to | |
915 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 916 | * of the vblank interval that corresponds to the current vblank counter value. |
27641c3f | 917 | */ |
cc1ef118 | 918 | u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, |
27641c3f MK |
919 | struct timeval *vblanktime) |
920 | { | |
cc1ef118 | 921 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f MK |
922 | u32 cur_vblank; |
923 | ||
cc1ef118 | 924 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
925 | return 0; |
926 | ||
99264a61 DV |
927 | /* |
928 | * Vblank timestamps are read lockless. To ensure consistency the vblank | |
929 | * counter is rechecked and ordering is ensured using memory barriers. | |
930 | * This works like a seqlock. The write-side barriers are in store_vblank. | |
27641c3f MK |
931 | */ |
932 | do { | |
99264a61 DV |
933 | cur_vblank = vblank->count; |
934 | smp_rmb(); | |
cc1ef118 | 935 | *vblanktime = vblanktimestamp(dev, pipe, cur_vblank); |
27641c3f | 936 | smp_rmb(); |
99264a61 | 937 | } while (cur_vblank != vblank->count); |
27641c3f MK |
938 | |
939 | return cur_vblank; | |
940 | } | |
941 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
942 | ||
c6eefa17 RC |
943 | static void send_vblank_event(struct drm_device *dev, |
944 | struct drm_pending_vblank_event *e, | |
945 | unsigned long seq, struct timeval *now) | |
946 | { | |
947 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
948 | e->event.sequence = seq; | |
949 | e->event.tv_sec = now->tv_sec; | |
950 | e->event.tv_usec = now->tv_usec; | |
951 | ||
952 | list_add_tail(&e->base.link, | |
953 | &e->base.file_priv->event_list); | |
954 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
955 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
956 | e->event.sequence); | |
957 | } | |
958 | ||
959 | /** | |
960 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
961 | * @dev: DRM device | |
cc1ef118 | 962 | * @pipe: CRTC index |
c6eefa17 RC |
963 | * @e: the event to send |
964 | * | |
965 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
966 | * Caller must hold event lock. | |
a4d7b30d TR |
967 | * |
968 | * This is the legacy version of drm_crtc_send_vblank_event(). | |
c6eefa17 | 969 | */ |
cc1ef118 TR |
970 | void drm_send_vblank_event(struct drm_device *dev, unsigned int pipe, |
971 | struct drm_pending_vblank_event *e) | |
c6eefa17 RC |
972 | { |
973 | struct timeval now; | |
974 | unsigned int seq; | |
4dfd909f | 975 | |
2a7d3d6d | 976 | if (dev->num_crtcs > 0) { |
cc1ef118 | 977 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c6eefa17 RC |
978 | } else { |
979 | seq = 0; | |
c61eef72 ID |
980 | |
981 | now = get_drm_timestamp(); | |
c6eefa17 | 982 | } |
cc1ef118 | 983 | e->pipe = pipe; |
c6eefa17 RC |
984 | send_vblank_event(dev, e, seq, &now); |
985 | } | |
986 | EXPORT_SYMBOL(drm_send_vblank_event); | |
987 | ||
a4d7b30d TR |
988 | /** |
989 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
990 | * @crtc: the source CRTC of the vblank event | |
991 | * @e: the event to send | |
992 | * | |
993 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
994 | * Caller must hold event lock. | |
995 | * | |
996 | * This is the native KMS version of drm_send_vblank_event(). | |
997 | */ | |
998 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
999 | struct drm_pending_vblank_event *e) | |
1000 | { | |
1001 | drm_send_vblank_event(crtc->dev, drm_crtc_index(crtc), e); | |
1002 | } | |
1003 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
1004 | ||
f2752282 VS |
1005 | /** |
1006 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
1007 | * @dev: DRM device | |
cc1ef118 | 1008 | * @pipe: CRTC index |
c30e11fc TR |
1009 | * |
1010 | * Returns: | |
1011 | * Zero on success or a negative error code on failure. | |
f2752282 | 1012 | */ |
cc1ef118 | 1013 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1014 | { |
cc1ef118 | 1015 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1016 | int ret = 0; |
1017 | ||
1018 | assert_spin_locked(&dev->vbl_lock); | |
1019 | ||
1020 | spin_lock(&dev->vblank_time_lock); | |
1021 | ||
8a51d5be | 1022 | if (!vblank->enabled) { |
1cfb80b1 DV |
1023 | /* |
1024 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
1025 | * All vblank count & timestamp updates are held off |
1026 | * until we are done reinitializing master counter and | |
1027 | * timestamps. Filtercode in drm_handle_vblank() will | |
1028 | * prevent double-accounting of same vblank interval. | |
1029 | */ | |
cc1ef118 TR |
1030 | ret = dev->driver->enable_vblank(dev, pipe); |
1031 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); | |
f2752282 | 1032 | if (ret) |
8a51d5be | 1033 | atomic_dec(&vblank->refcount); |
f2752282 | 1034 | else { |
8a51d5be | 1035 | vblank->enabled = true; |
cc1ef118 | 1036 | drm_update_vblank_count(dev, pipe); |
f2752282 VS |
1037 | } |
1038 | } | |
1039 | ||
1040 | spin_unlock(&dev->vblank_time_lock); | |
1041 | ||
1042 | return ret; | |
1043 | } | |
1044 | ||
0a3e67a4 JB |
1045 | /** |
1046 | * drm_vblank_get - get a reference count on vblank events | |
1047 | * @dev: DRM device | |
cc1ef118 | 1048 | * @pipe: index of CRTC to own |
0a3e67a4 JB |
1049 | * |
1050 | * Acquire a reference count on vblank events to avoid having them disabled | |
1051 | * while in use. | |
1052 | * | |
89dd6a4b DV |
1053 | * This is the legacy version of drm_crtc_vblank_get(). |
1054 | * | |
f5752b38 | 1055 | * Returns: |
c30e11fc | 1056 | * Zero on success or a negative error code on failure. |
0a3e67a4 | 1057 | */ |
cc1ef118 | 1058 | int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1059 | { |
cc1ef118 | 1060 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
97cbc883 | 1061 | unsigned long irqflags; |
0a3e67a4 JB |
1062 | int ret = 0; |
1063 | ||
16e3247d GH |
1064 | if (!dev->num_crtcs) |
1065 | return -EINVAL; | |
1066 | ||
cc1ef118 | 1067 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1068 | return -EINVAL; |
1069 | ||
0a3e67a4 JB |
1070 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1071 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 1072 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
cc1ef118 | 1073 | ret = drm_vblank_enable(dev, pipe); |
778c9026 | 1074 | } else { |
8a51d5be VS |
1075 | if (!vblank->enabled) { |
1076 | atomic_dec(&vblank->refcount); | |
778c9026 | 1077 | ret = -EINVAL; |
0a3e67a4 JB |
1078 | } |
1079 | } | |
1080 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1081 | ||
1082 | return ret; | |
1083 | } | |
1084 | EXPORT_SYMBOL(drm_vblank_get); | |
1085 | ||
89dd6a4b DV |
1086 | /** |
1087 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1088 | * @crtc: which CRTC to own | |
1089 | * | |
1090 | * Acquire a reference count on vblank events to avoid having them disabled | |
1091 | * while in use. | |
1092 | * | |
30b79f06 | 1093 | * This is the native kms version of drm_vblank_get(). |
89dd6a4b DV |
1094 | * |
1095 | * Returns: | |
c30e11fc | 1096 | * Zero on success or a negative error code on failure. |
89dd6a4b DV |
1097 | */ |
1098 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1099 | { | |
1100 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1101 | } | |
1102 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1103 | ||
0a3e67a4 | 1104 | /** |
cc1ef118 | 1105 | * drm_vblank_put - release ownership of vblank events |
0a3e67a4 | 1106 | * @dev: DRM device |
cc1ef118 | 1107 | * @pipe: index of CRTC to release |
0a3e67a4 JB |
1108 | * |
1109 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 1110 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
1111 | * |
1112 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 | 1113 | */ |
cc1ef118 | 1114 | void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1115 | { |
cc1ef118 | 1116 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1117 | |
cc1ef118 | 1118 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7f907bf2 | 1119 | return; |
b3f5e732 | 1120 | |
7d1de851 | 1121 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) |
e6ae8687 RC |
1122 | return; |
1123 | ||
0a3e67a4 | 1124 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1125 | if (atomic_dec_and_test(&vblank->refcount)) { |
ab8905f1 DV |
1126 | if (drm_vblank_offdelay == 0) |
1127 | return; | |
1128 | else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) | |
4ed0ce3d | 1129 | vblank_disable_fn((unsigned long)vblank); |
ab8905f1 | 1130 | else |
4ed0ce3d VS |
1131 | mod_timer(&vblank->disable_timer, |
1132 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1133 | } | |
0a3e67a4 JB |
1134 | } |
1135 | EXPORT_SYMBOL(drm_vblank_put); | |
1136 | ||
89dd6a4b DV |
1137 | /** |
1138 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1139 | * @crtc: which counter to give up | |
1140 | * | |
1141 | * Release ownership of a given vblank counter, turning off interrupts | |
1142 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1143 | * | |
1144 | * This is the native kms version of drm_vblank_put(). | |
1145 | */ | |
1146 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1147 | { | |
1148 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1149 | } | |
1150 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1151 | ||
e8450f51 DV |
1152 | /** |
1153 | * drm_wait_one_vblank - wait for one vblank | |
1154 | * @dev: DRM device | |
cc1ef118 | 1155 | * @pipe: CRTC index |
e8450f51 DV |
1156 | * |
1157 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1158 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1159 | * due to lack of driver support or because the crtc is off. | |
1160 | */ | |
cc1ef118 | 1161 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) |
e8450f51 | 1162 | { |
cc1ef118 | 1163 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
e8450f51 DV |
1164 | int ret; |
1165 | u32 last; | |
1166 | ||
cc1ef118 | 1167 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1168 | return; |
1169 | ||
cc1ef118 TR |
1170 | ret = drm_vblank_get(dev, pipe); |
1171 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |
e8450f51 DV |
1172 | return; |
1173 | ||
cc1ef118 | 1174 | last = drm_vblank_count(dev, pipe); |
e8450f51 | 1175 | |
cc1ef118 TR |
1176 | ret = wait_event_timeout(vblank->queue, |
1177 | last != drm_vblank_count(dev, pipe), | |
e8450f51 DV |
1178 | msecs_to_jiffies(100)); |
1179 | ||
cc1ef118 | 1180 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); |
e8450f51 | 1181 | |
cc1ef118 | 1182 | drm_vblank_put(dev, pipe); |
e8450f51 DV |
1183 | } |
1184 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1185 | ||
1186 | /** | |
1187 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1188 | * @crtc: DRM crtc | |
1189 | * | |
1190 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1191 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1192 | * due to lack of driver support or because the crtc is off. | |
1193 | */ | |
1194 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1195 | { | |
1196 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1197 | } | |
1198 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1199 | ||
c6eefa17 RC |
1200 | /** |
1201 | * drm_vblank_off - disable vblank events on a CRTC | |
1202 | * @dev: DRM device | |
cc1ef118 | 1203 | * @pipe: CRTC index |
c6eefa17 | 1204 | * |
f5752b38 DV |
1205 | * Drivers can use this function to shut down the vblank interrupt handling when |
1206 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1207 | * stored so that drm_vblank_on() can restore it again. | |
1208 | * | |
1209 | * Drivers must use this function when the hardware vblank counter can get | |
1210 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1211 | * |
1212 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1213 | */ |
cc1ef118 | 1214 | void drm_vblank_off(struct drm_device *dev, unsigned int pipe) |
778c9026 | 1215 | { |
cc1ef118 | 1216 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
498548ec CJHR |
1217 | struct drm_pending_vblank_event *e, *t; |
1218 | struct timeval now; | |
778c9026 | 1219 | unsigned long irqflags; |
498548ec | 1220 | unsigned int seq; |
778c9026 | 1221 | |
cc1ef118 | 1222 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1223 | return; |
1224 | ||
56cc279b VS |
1225 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1226 | ||
1227 | spin_lock(&dev->vbl_lock); | |
cc1ef118 | 1228 | vblank_disable_and_save(dev, pipe); |
8a51d5be | 1229 | wake_up(&vblank->queue); |
498548ec | 1230 | |
56cc279b VS |
1231 | /* |
1232 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1233 | * the vblank interrupt by bumping the refcount. | |
1234 | */ | |
1235 | if (!vblank->inmodeset) { | |
1236 | atomic_inc(&vblank->refcount); | |
1237 | vblank->inmodeset = 1; | |
1238 | } | |
1239 | spin_unlock(&dev->vbl_lock); | |
1240 | ||
498548ec | 1241 | /* Send any queued vblank events, lest the natives grow disquiet */ |
cc1ef118 | 1242 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
e7783ba3 | 1243 | |
498548ec | 1244 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
cc1ef118 | 1245 | if (e->pipe != pipe) |
498548ec CJHR |
1246 | continue; |
1247 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
1248 | wanted %d, current %d\n", | |
1249 | e->event.sequence, seq); | |
c6eefa17 | 1250 | list_del(&e->base.link); |
cc1ef118 | 1251 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1252 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1253 | } |
56cc279b | 1254 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 LP |
1255 | } |
1256 | EXPORT_SYMBOL(drm_vblank_off); | |
1257 | ||
89dd6a4b DV |
1258 | /** |
1259 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1260 | * @crtc: CRTC in question | |
1261 | * | |
1262 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1263 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1264 | * stored so that drm_vblank_on can restore it again. | |
1265 | * | |
1266 | * Drivers must use this function when the hardware vblank counter can get | |
1267 | * reset, e.g. when suspending. | |
1268 | * | |
1269 | * This is the native kms version of drm_vblank_off(). | |
1270 | */ | |
1271 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1272 | { | |
1273 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1274 | } | |
1275 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1276 | ||
9625604c DV |
1277 | /** |
1278 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
ec081cb3 | 1279 | * @drm_crtc: CRTC in question |
9625604c DV |
1280 | * |
1281 | * Drivers can use this function to reset the vblank state to off at load time. | |
1282 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1283 | * drm_crtc_vblank_on() functions. The difference compared to | |
1284 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1285 | * and hence doesn't need to call any driver hooks. | |
1286 | */ | |
1287 | void drm_crtc_vblank_reset(struct drm_crtc *drm_crtc) | |
1288 | { | |
1289 | struct drm_device *dev = drm_crtc->dev; | |
1290 | unsigned long irqflags; | |
1291 | int crtc = drm_crtc_index(drm_crtc); | |
1292 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; | |
1293 | ||
1294 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1295 | /* | |
1296 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1297 | * interrupt by bumping the refcount. | |
1298 | */ | |
1299 | if (!vblank->inmodeset) { | |
1300 | atomic_inc(&vblank->refcount); | |
1301 | vblank->inmodeset = 1; | |
1302 | } | |
1303 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1304 | ||
1305 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1306 | } | |
1307 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1308 | ||
f2752282 VS |
1309 | /** |
1310 | * drm_vblank_on - enable vblank events on a CRTC | |
1311 | * @dev: DRM device | |
cc1ef118 | 1312 | * @pipe: CRTC index |
f5752b38 DV |
1313 | * |
1314 | * This functions restores the vblank interrupt state captured with | |
1315 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1316 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
f5752b38 | 1317 | * in driver load code to reflect the current hardware state of the crtc. |
89dd6a4b DV |
1318 | * |
1319 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 | 1320 | */ |
cc1ef118 | 1321 | void drm_vblank_on(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1322 | { |
cc1ef118 | 1323 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1324 | unsigned long irqflags; |
1325 | ||
cc1ef118 | 1326 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1327 | return; |
1328 | ||
f2752282 | 1329 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
7ffd7a68 | 1330 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1331 | if (vblank->inmodeset) { |
1332 | atomic_dec(&vblank->refcount); | |
1333 | vblank->inmodeset = 0; | |
7ffd7a68 | 1334 | } |
f8ad028c VS |
1335 | |
1336 | /* | |
1337 | * sample the current counter to avoid random jumps | |
1338 | * when drm_vblank_enable() applies the diff | |
1339 | * | |
1340 | * -1 to make sure user will never see the same | |
1341 | * vblank counter value before and after a modeset | |
1342 | */ | |
8a51d5be | 1343 | vblank->last = |
cc1ef118 | 1344 | (dev->driver->get_vblank_counter(dev, pipe) - 1) & |
f8ad028c | 1345 | dev->max_vblank_count; |
cd19e52a VS |
1346 | /* |
1347 | * re-enable interrupts if there are users left, or the | |
1348 | * user wishes vblank interrupts to be enabled all the time. | |
1349 | */ | |
1350 | if (atomic_read(&vblank->refcount) != 0 || | |
1351 | (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0)) | |
cc1ef118 | 1352 | WARN_ON(drm_vblank_enable(dev, pipe)); |
f2752282 VS |
1353 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1354 | } | |
1355 | EXPORT_SYMBOL(drm_vblank_on); | |
1356 | ||
89dd6a4b DV |
1357 | /** |
1358 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1359 | * @crtc: CRTC in question | |
1360 | * | |
1361 | * This functions restores the vblank interrupt state captured with | |
1362 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1363 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
89dd6a4b DV |
1364 | * in driver load code to reflect the current hardware state of the crtc. |
1365 | * | |
1366 | * This is the native kms version of drm_vblank_on(). | |
1367 | */ | |
1368 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1369 | { | |
1370 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1371 | } | |
1372 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1373 | ||
f453ba04 DA |
1374 | /** |
1375 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1376 | * @dev: DRM device | |
cc1ef118 | 1377 | * @pipe: CRTC index |
f453ba04 DA |
1378 | * |
1379 | * Account for vblank events across mode setting events, which will likely | |
1380 | * reset the hardware frame counter. | |
f5752b38 DV |
1381 | * |
1382 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1383 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1384 | * software-side vblank frame counting will ensure that there are no jumps or | |
1385 | * discontinuities. | |
1386 | * | |
1387 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1388 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1389 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1390 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1391 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1392 | * counters. | |
1393 | * | |
1394 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1395 | * again. | |
f453ba04 | 1396 | */ |
cc1ef118 | 1397 | void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe) |
f453ba04 | 1398 | { |
cc1ef118 | 1399 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1400 | |
b7ea85a4 | 1401 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1402 | if (!dev->num_crtcs) |
1403 | return; | |
e6ae8687 | 1404 | |
cc1ef118 | 1405 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1406 | return; |
1407 | ||
f453ba04 DA |
1408 | /* |
1409 | * To avoid all the problems that might happen if interrupts | |
1410 | * were enabled/disabled around or between these calls, we just | |
1411 | * have the kernel take a reference on the CRTC (just once though | |
1412 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1413 | * so that interrupts remain enabled in the interim. | |
1414 | */ | |
8a51d5be VS |
1415 | if (!vblank->inmodeset) { |
1416 | vblank->inmodeset = 0x1; | |
cc1ef118 | 1417 | if (drm_vblank_get(dev, pipe) == 0) |
8a51d5be | 1418 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1419 | } |
1420 | } | |
1421 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1422 | ||
f5752b38 DV |
1423 | /** |
1424 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1425 | * @dev: DRM device | |
cc1ef118 | 1426 | * @pipe: CRTC index |
f5752b38 DV |
1427 | * |
1428 | * This function again drops the temporary vblank reference acquired in | |
1429 | * drm_vblank_pre_modeset. | |
1430 | */ | |
cc1ef118 | 1431 | void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe) |
f453ba04 | 1432 | { |
cc1ef118 | 1433 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f453ba04 DA |
1434 | unsigned long irqflags; |
1435 | ||
b7ea85a4 HC |
1436 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1437 | if (!dev->num_crtcs) | |
1438 | return; | |
1439 | ||
cc1ef118 | 1440 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1441 | return; |
1442 | ||
8a51d5be | 1443 | if (vblank->inmodeset) { |
f453ba04 | 1444 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
ba0bf120 | 1445 | dev->vblank_disable_allowed = true; |
f453ba04 | 1446 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1447 | |
8a51d5be | 1448 | if (vblank->inmodeset & 0x2) |
cc1ef118 | 1449 | drm_vblank_put(dev, pipe); |
b3f5e732 | 1450 | |
8a51d5be | 1451 | vblank->inmodeset = 0; |
f453ba04 DA |
1452 | } |
1453 | } | |
1454 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1455 | ||
f5752b38 | 1456 | /* |
0a3e67a4 JB |
1457 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1458 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1459 | * | |
1460 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1461 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1462 | * | |
1463 | * Generally the counter will reset across mode sets. If interrupts are | |
1464 | * enabled around this call, we don't have to do anything since the counter | |
1465 | * will have already been incremented. | |
1466 | */ | |
1467 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1468 | struct drm_file *file_priv) | |
1469 | { | |
1470 | struct drm_modeset_ctl *modeset = data; | |
cc1ef118 | 1471 | unsigned int pipe; |
0a3e67a4 JB |
1472 | |
1473 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1474 | if (!dev->num_crtcs) | |
4a1b0714 | 1475 | return 0; |
0a3e67a4 | 1476 | |
29935554 LP |
1477 | /* KMS drivers handle this internally */ |
1478 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1479 | return 0; | |
1480 | ||
cc1ef118 TR |
1481 | pipe = modeset->crtc; |
1482 | if (pipe >= dev->num_crtcs) | |
4a1b0714 | 1483 | return -EINVAL; |
0a3e67a4 | 1484 | |
0a3e67a4 JB |
1485 | switch (modeset->cmd) { |
1486 | case _DRM_PRE_MODESET: | |
cc1ef118 | 1487 | drm_vblank_pre_modeset(dev, pipe); |
0a3e67a4 JB |
1488 | break; |
1489 | case _DRM_POST_MODESET: | |
cc1ef118 | 1490 | drm_vblank_post_modeset(dev, pipe); |
0a3e67a4 JB |
1491 | break; |
1492 | default: | |
4a1b0714 | 1493 | return -EINVAL; |
0a3e67a4 JB |
1494 | } |
1495 | ||
4a1b0714 | 1496 | return 0; |
0a3e67a4 JB |
1497 | } |
1498 | ||
cc1ef118 | 1499 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, |
c9a9c5e0 KH |
1500 | union drm_wait_vblank *vblwait, |
1501 | struct drm_file *file_priv) | |
1502 | { | |
ffe7c73a | 1503 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1504 | struct drm_pending_vblank_event *e; |
1505 | struct timeval now; | |
1506 | unsigned long flags; | |
1507 | unsigned int seq; | |
ea5d552c | 1508 | int ret; |
c9a9c5e0 | 1509 | |
f76511b9 | 1510 | e = kzalloc(sizeof(*e), GFP_KERNEL); |
ea5d552c CW |
1511 | if (e == NULL) { |
1512 | ret = -ENOMEM; | |
1513 | goto err_put; | |
1514 | } | |
c9a9c5e0 KH |
1515 | |
1516 | e->pipe = pipe; | |
b9c2c9ae | 1517 | e->base.pid = current->pid; |
c9a9c5e0 | 1518 | e->event.base.type = DRM_EVENT_VBLANK; |
f76511b9 | 1519 | e->event.base.length = sizeof(e->event); |
c9a9c5e0 KH |
1520 | e->event.user_data = vblwait->request.signal; |
1521 | e->base.event = &e->event.base; | |
1522 | e->base.file_priv = file_priv; | |
1523 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1524 | ||
c9a9c5e0 KH |
1525 | spin_lock_irqsave(&dev->event_lock, flags); |
1526 | ||
ffe7c73a VS |
1527 | /* |
1528 | * drm_vblank_off() might have been called after we called | |
1529 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1530 | * around the vblank disable, so no need for further locking. | |
1531 | * The reference from drm_vblank_get() protects against | |
1532 | * vblank disable from another source. | |
1533 | */ | |
1534 | if (!vblank->enabled) { | |
1535 | ret = -EINVAL; | |
1536 | goto err_unlock; | |
1537 | } | |
1538 | ||
f76511b9 | 1539 | if (file_priv->event_space < sizeof(e->event)) { |
ea5d552c CW |
1540 | ret = -EBUSY; |
1541 | goto err_unlock; | |
c9a9c5e0 KH |
1542 | } |
1543 | ||
f76511b9 | 1544 | file_priv->event_space -= sizeof(e->event); |
27641c3f MK |
1545 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1546 | ||
c9a9c5e0 KH |
1547 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1548 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1549 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1550 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1551 | } |
1552 | ||
cc1ef118 | 1553 | DRM_DEBUG("event on vblank count %d, current %d, crtc %u\n", |
c9a9c5e0 KH |
1554 | vblwait->request.sequence, seq, pipe); |
1555 | ||
b9c2c9ae JB |
1556 | trace_drm_vblank_event_queued(current->pid, pipe, |
1557 | vblwait->request.sequence); | |
1558 | ||
c9a9c5e0 KH |
1559 | e->event.sequence = vblwait->request.sequence; |
1560 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1561 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1562 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1563 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1564 | } else { |
a6778e9e | 1565 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1566 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1567 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1568 | } |
1569 | ||
1570 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1571 | ||
1572 | return 0; | |
ea5d552c CW |
1573 | |
1574 | err_unlock: | |
1575 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1576 | kfree(e); | |
1577 | err_put: | |
6f331623 | 1578 | drm_vblank_put(dev, pipe); |
ea5d552c | 1579 | return ret; |
c9a9c5e0 KH |
1580 | } |
1581 | ||
f5752b38 | 1582 | /* |
1da177e4 LT |
1583 | * Wait for VBLANK. |
1584 | * | |
1585 | * \param inode device inode. | |
6c340eac | 1586 | * \param file_priv DRM file private. |
1da177e4 LT |
1587 | * \param cmd command. |
1588 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1589 | * \return zero on success or a negative number on failure. | |
1590 | * | |
30b23634 EA |
1591 | * This function enables the vblank interrupt on the pipe requested, then |
1592 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1593 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1594 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1595 | */ |
0a3e67a4 JB |
1596 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1597 | struct drm_file *file_priv) | |
1da177e4 | 1598 | { |
8a51d5be | 1599 | struct drm_vblank_crtc *vblank; |
c153f45f | 1600 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1601 | int ret; |
cc1ef118 | 1602 | unsigned int flags, seq, pipe, high_pipe; |
1da177e4 | 1603 | |
4984979b DV |
1604 | if (!dev->irq_enabled) |
1605 | return -EINVAL; | |
1da177e4 | 1606 | |
30b23634 EA |
1607 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1608 | return -EINVAL; | |
1609 | ||
c153f45f | 1610 | if (vblwait->request.type & |
19b01b5f IH |
1611 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1612 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1613 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1614 | vblwait->request.type, |
19b01b5f IH |
1615 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1616 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MCA |
1617 | return -EINVAL; |
1618 | } | |
1619 | ||
c153f45f | 1620 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
cc1ef118 TR |
1621 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1622 | if (high_pipe) | |
1623 | pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
19b01b5f | 1624 | else |
cc1ef118 TR |
1625 | pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1626 | if (pipe >= dev->num_crtcs) | |
776c9443 MCA |
1627 | return -EINVAL; |
1628 | ||
cc1ef118 | 1629 | vblank = &dev->vblank[pipe]; |
8a51d5be | 1630 | |
cc1ef118 | 1631 | ret = drm_vblank_get(dev, pipe); |
0a3e67a4 | 1632 | if (ret) { |
8d3457ec | 1633 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1634 | return ret; |
1635 | } | |
cc1ef118 | 1636 | seq = drm_vblank_count(dev, pipe); |
776c9443 | 1637 | |
c153f45f | 1638 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1639 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1640 | vblwait->request.sequence += seq; |
1641 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1642 | case _DRM_VBLANK_ABSOLUTE: |
1643 | break; | |
1644 | default: | |
0a3e67a4 JB |
1645 | ret = -EINVAL; |
1646 | goto done; | |
1da177e4 LT |
1647 | } |
1648 | ||
a6778e9e IH |
1649 | if (flags & _DRM_VBLANK_EVENT) { |
1650 | /* must hold on to the vblank ref until the event fires | |
1651 | * drm_vblank_put will be called asynchronously | |
1652 | */ | |
cc1ef118 | 1653 | return drm_queue_vblank_event(dev, pipe, vblwait, file_priv); |
a6778e9e | 1654 | } |
c9a9c5e0 | 1655 | |
ab285d74 | 1656 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1657 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1658 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
1659 | } |
1660 | ||
cc1ef118 TR |
1661 | DRM_DEBUG("waiting on vblank count %d, crtc %u\n", |
1662 | vblwait->request.sequence, pipe); | |
8a51d5be VS |
1663 | vblank->last_wait = vblwait->request.sequence; |
1664 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
cc1ef118 | 1665 | (((drm_vblank_count(dev, pipe) - |
30b23634 | 1666 | vblwait->request.sequence) <= (1 << 23)) || |
8a51d5be | 1667 | !vblank->enabled || |
30b23634 | 1668 | !dev->irq_enabled)); |
1da177e4 | 1669 | |
30b23634 EA |
1670 | if (ret != -EINTR) { |
1671 | struct timeval now; | |
1da177e4 | 1672 | |
cc1ef118 | 1673 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, pipe, &now); |
30b23634 EA |
1674 | vblwait->reply.tval_sec = now.tv_sec; |
1675 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1676 | |
30b23634 EA |
1677 | DRM_DEBUG("returning %d to client\n", |
1678 | vblwait->reply.sequence); | |
1da177e4 | 1679 | } else { |
30b23634 | 1680 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1681 | } |
1682 | ||
0a3e67a4 | 1683 | done: |
cc1ef118 | 1684 | drm_vblank_put(dev, pipe); |
1da177e4 LT |
1685 | return ret; |
1686 | } | |
1687 | ||
cc1ef118 | 1688 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) |
c9a9c5e0 KH |
1689 | { |
1690 | struct drm_pending_vblank_event *e, *t; | |
1691 | struct timeval now; | |
c9a9c5e0 KH |
1692 | unsigned int seq; |
1693 | ||
56cc279b | 1694 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1695 | |
cc1ef118 | 1696 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c9a9c5e0 KH |
1697 | |
1698 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
cc1ef118 | 1699 | if (e->pipe != pipe) |
c9a9c5e0 KH |
1700 | continue; |
1701 | if ((seq - e->event.sequence) > (1<<23)) | |
1702 | continue; | |
1703 | ||
1704 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1705 | e->event.sequence, seq); | |
1706 | ||
c6eefa17 | 1707 | list_del(&e->base.link); |
cc1ef118 | 1708 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1709 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1710 | } |
1711 | ||
cc1ef118 | 1712 | trace_drm_vblank_event(pipe, seq); |
c9a9c5e0 KH |
1713 | } |
1714 | ||
0a3e67a4 JB |
1715 | /** |
1716 | * drm_handle_vblank - handle a vblank event | |
1717 | * @dev: DRM device | |
cc1ef118 | 1718 | * @pipe: index of CRTC where this event occurred |
0a3e67a4 JB |
1719 | * |
1720 | * Drivers should call this routine in their vblank interrupt handlers to | |
1721 | * update the vblank counter and send any signals that may be pending. | |
115ebcd4 TR |
1722 | * |
1723 | * This is the legacy version of drm_crtc_handle_vblank(). | |
0a3e67a4 | 1724 | */ |
cc1ef118 | 1725 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1726 | { |
cc1ef118 | 1727 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f MK |
1728 | u32 vblcount; |
1729 | s64 diff_ns; | |
1730 | struct timeval tvblank; | |
1731 | unsigned long irqflags; | |
1732 | ||
ee3c7795 | 1733 | if (WARN_ON_ONCE(!dev->num_crtcs)) |
78c6e170 | 1734 | return false; |
c9a9c5e0 | 1735 | |
cc1ef118 | 1736 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1737 | return false; |
1738 | ||
56cc279b VS |
1739 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1740 | ||
27641c3f MK |
1741 | /* Need timestamp lock to prevent concurrent execution with |
1742 | * vblank enable/disable, as this would cause inconsistent | |
1743 | * or corrupted timestamps and vblank counts. | |
1744 | */ | |
56cc279b | 1745 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1746 | |
1747 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1748 | if (!vblank->enabled) { |
56cc279b VS |
1749 | spin_unlock(&dev->vblank_time_lock); |
1750 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1751 | return false; |
27641c3f MK |
1752 | } |
1753 | ||
1754 | /* Fetch corresponding timestamp for this vblank interval from | |
1755 | * driver and store it in proper slot of timestamp ringbuffer. | |
1756 | */ | |
1757 | ||
1758 | /* Get current timestamp and count. */ | |
99264a61 | 1759 | vblcount = vblank->count; |
cc1ef118 | 1760 | drm_get_last_vbltimestamp(dev, pipe, &tvblank, DRM_CALLED_FROM_VBLIRQ); |
27641c3f MK |
1761 | |
1762 | /* Compute time difference to timestamp of last vblank */ | |
1763 | diff_ns = timeval_to_ns(&tvblank) - | |
cc1ef118 | 1764 | timeval_to_ns(&vblanktimestamp(dev, pipe, vblcount)); |
27641c3f MK |
1765 | |
1766 | /* Update vblank timestamp and count if at least | |
1767 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1768 | * difference between last stored timestamp and current | |
1769 | * timestamp. A smaller difference means basically | |
1770 | * identical timestamps. Happens if this vblank has | |
1771 | * been already processed and this is a redundant call, | |
1772 | * e.g., due to spurious vblank interrupts. We need to | |
1773 | * ignore those for accounting. | |
1774 | */ | |
99264a61 | 1775 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) |
cc1ef118 | 1776 | store_vblank(dev, pipe, 1, &tvblank); |
99264a61 | 1777 | else |
cc1ef118 TR |
1778 | DRM_DEBUG("crtc %u: Redundant vblirq ignored. diff_ns = %d\n", |
1779 | pipe, (int) diff_ns); | |
27641c3f | 1780 | |
56cc279b VS |
1781 | spin_unlock(&dev->vblank_time_lock); |
1782 | ||
8a51d5be | 1783 | wake_up(&vblank->queue); |
cc1ef118 | 1784 | drm_handle_vblank_events(dev, pipe); |
27641c3f | 1785 | |
56cc279b VS |
1786 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1787 | ||
78c6e170 | 1788 | return true; |
0a3e67a4 JB |
1789 | } |
1790 | EXPORT_SYMBOL(drm_handle_vblank); | |
115ebcd4 TR |
1791 | |
1792 | /** | |
1793 | * drm_crtc_handle_vblank - handle a vblank event | |
1794 | * @crtc: where this event occurred | |
1795 | * | |
1796 | * Drivers should call this routine in their vblank interrupt handlers to | |
1797 | * update the vblank counter and send any signals that may be pending. | |
1798 | * | |
1799 | * This is the native KMS version of drm_handle_vblank(). | |
1800 | * | |
1801 | * Returns: | |
1802 | * True if the event was successfully handled, false on failure. | |
1803 | */ | |
1804 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1805 | { | |
1806 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1807 | } | |
1808 | EXPORT_SYMBOL(drm_crtc_handle_vblank); |