]>
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 | 44 | |
27641c3f MK |
45 | /* Retry timestamp calculation up to 3 times to satisfy |
46 | * drm_timestamp_precision before giving up. | |
47 | */ | |
48 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
49 | ||
50 | /* Threshold in nanoseconds for detection of redundant | |
51 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
52 | */ | |
53 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
54 | ||
fb446a1a | 55 | static bool |
cc1ef118 | 56 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a DV |
57 | struct timeval *tvblank, unsigned flags); |
58 | ||
18882995 DV |
59 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ |
60 | ||
61 | /* | |
62 | * Default to use monotonic timestamps for wait-for-vblank and page-flip | |
63 | * complete events. | |
64 | */ | |
65 | unsigned int drm_timestamp_monotonic = 1; | |
66 | ||
67 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ | |
68 | ||
69 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
70 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
71 | module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600); | |
d9d8c4cf DC |
72 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); |
73 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); | |
74 | MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps"); | |
18882995 | 75 | |
1da248a5 | 76 | static void store_vblank(struct drm_device *dev, unsigned int pipe, |
209e4dbc | 77 | u32 vblank_count_inc, |
4dfd6486 | 78 | struct timeval *t_vblank, u32 last) |
99264a61 | 79 | { |
1da248a5 | 80 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
99264a61 DV |
81 | |
82 | assert_spin_locked(&dev->vblank_time_lock); | |
83 | ||
4dfd6486 VS |
84 | vblank->last = last; |
85 | ||
d4055a9b MA |
86 | write_seqlock(&vblank->seqlock); |
87 | vblank->time = *t_vblank; | |
99264a61 | 88 | vblank->count += vblank_count_inc; |
d4055a9b | 89 | write_sequnlock(&vblank->seqlock); |
99264a61 DV |
90 | } |
91 | ||
4dfd6486 VS |
92 | /** |
93 | * drm_reset_vblank_timestamp - reset the last timestamp to the last vblank | |
94 | * @dev: DRM device | |
95 | * @pipe: index of CRTC for which to reset the timestamp | |
96 | * | |
97 | * Reset the stored timestamp for the current vblank count to correspond | |
98 | * to the last vblank occurred. | |
99 | * | |
100 | * Only to be called from drm_vblank_on(). | |
101 | * | |
102 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
103 | * device vblank fields. | |
104 | */ | |
105 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) | |
106 | { | |
107 | u32 cur_vblank; | |
108 | bool rc; | |
109 | struct timeval t_vblank; | |
110 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
111 | ||
112 | spin_lock(&dev->vblank_time_lock); | |
113 | ||
114 | /* | |
115 | * sample the current counter to avoid random jumps | |
116 | * when drm_vblank_enable() applies the diff | |
117 | */ | |
118 | do { | |
119 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); | |
120 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0); | |
121 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0); | |
122 | ||
123 | /* | |
124 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
125 | * available and didn't fail. Otherwise reinitialize delayed at next vblank | |
126 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
127 | */ | |
128 | if (!rc) | |
129 | t_vblank = (struct timeval) {0, 0}; | |
130 | ||
131 | /* | |
132 | * +1 to make sure user will never see the same | |
133 | * vblank counter value before and after a modeset | |
134 | */ | |
135 | store_vblank(dev, pipe, 1, &t_vblank, cur_vblank); | |
136 | ||
137 | spin_unlock(&dev->vblank_time_lock); | |
138 | } | |
139 | ||
13b030af VS |
140 | /** |
141 | * drm_update_vblank_count - update the master vblank counter | |
142 | * @dev: DRM device | |
cc1ef118 | 143 | * @pipe: counter to update |
13b030af VS |
144 | * |
145 | * Call back into the driver to update the appropriate vblank counter | |
1da248a5 | 146 | * (specified by @pipe). Deal with wraparound, if it occurred, and |
13b030af VS |
147 | * update the last read value so we can deal with wraparound on the next |
148 | * call if necessary. | |
149 | * | |
150 | * Only necessary when going from off->on, to account for frames we | |
151 | * didn't get an interrupt for. | |
152 | * | |
153 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
154 | * device vblank fields. | |
155 | */ | |
a6e610dc VS |
156 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, |
157 | unsigned long flags) | |
13b030af | 158 | { |
cc1ef118 | 159 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
99264a61 | 160 | u32 cur_vblank, diff; |
fb446a1a | 161 | bool rc; |
13b030af | 162 | struct timeval t_vblank; |
facfb062 | 163 | int count = DRM_TIMESTAMP_MAXRETRIES; |
4dfd6486 | 164 | int framedur_ns = vblank->framedur_ns; |
13b030af VS |
165 | |
166 | /* | |
167 | * Interrupts were disabled prior to this call, so deal with counter | |
168 | * wrap if needed. | |
5ceecb2f | 169 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events |
13b030af VS |
170 | * here if the register is small or we had vblank interrupts off for |
171 | * a long time. | |
172 | * | |
173 | * We repeat the hardware vblank counter & timestamp query until | |
174 | * we get consistent results. This to prevent races between gpu | |
175 | * updating its hardware counter while we are retrieving the | |
176 | * corresponding vblank timestamp. | |
177 | */ | |
178 | do { | |
cc1ef118 | 179 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); |
a6e610dc | 180 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags); |
facfb062 | 181 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0); |
13b030af | 182 | |
4dfd6486 VS |
183 | if (dev->max_vblank_count != 0) { |
184 | /* trust the hw counter when it's around */ | |
185 | diff = (cur_vblank - vblank->last) & dev->max_vblank_count; | |
186 | } else if (rc && framedur_ns) { | |
187 | const struct timeval *t_old; | |
188 | u64 diff_ns; | |
189 | ||
d4055a9b | 190 | t_old = &vblank->time; |
4dfd6486 | 191 | diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old); |
13b030af | 192 | |
4dfd6486 VS |
193 | /* |
194 | * Figure out how many vblanks we've missed based | |
195 | * on the difference in the timestamps and the | |
196 | * frame/field duration. | |
197 | */ | |
198 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |
199 | ||
200 | if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ) | |
235fabe0 VS |
201 | DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored." |
202 | " diff_ns = %lld, framedur_ns = %d)\n", | |
203 | pipe, (long long) diff_ns, framedur_ns); | |
4dfd6486 VS |
204 | } else { |
205 | /* some kind of default for drivers w/o accurate vbl timestamping */ | |
206 | diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0; | |
13b030af VS |
207 | } |
208 | ||
c61934ed MK |
209 | /* |
210 | * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset | |
211 | * interval? If so then vblank irqs keep running and it will likely | |
212 | * happen that the hardware vblank counter is not trustworthy as it | |
213 | * might reset at some point in that interval and vblank timestamps | |
214 | * are not trustworthy either in that interval. Iow. this can result | |
215 | * in a bogus diff >> 1 which must be avoided as it would cause | |
216 | * random large forward jumps of the software vblank counter. | |
217 | */ | |
218 | if (diff > 1 && (vblank->inmodeset & 0x2)) { | |
219 | DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u" | |
220 | " due to pre-modeset.\n", pipe, diff); | |
221 | diff = 1; | |
222 | } | |
223 | ||
235fabe0 VS |
224 | DRM_DEBUG_VBL("updating vblank count on crtc %u:" |
225 | " current=%u, diff=%u, hw=%u hw_last=%u\n", | |
226 | pipe, vblank->count, diff, cur_vblank, vblank->last); | |
13b030af | 227 | |
4dfd6486 VS |
228 | if (diff == 0) { |
229 | WARN_ON_ONCE(cur_vblank != vblank->last); | |
da8f4396 | 230 | return; |
4dfd6486 | 231 | } |
da8f4396 | 232 | |
99264a61 DV |
233 | /* |
234 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
fa4270d8 VS |
235 | * available and didn't fail, or we were called from the vblank interrupt. |
236 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 | |
237 | * for now, to mark the vblanktimestamp as invalid. | |
13b030af | 238 | */ |
fa4270d8 | 239 | if (!rc && (flags & DRM_CALLED_FROM_VBLIRQ) == 0) |
d66a1e38 MK |
240 | t_vblank = (struct timeval) {0, 0}; |
241 | ||
4dfd6486 | 242 | store_vblank(dev, pipe, diff, &t_vblank, cur_vblank); |
13b030af VS |
243 | } |
244 | ||
af61d5ce ML |
245 | /** |
246 | * drm_accurate_vblank_count - retrieve the master vblank counter | |
247 | * @crtc: which counter to retrieve | |
248 | * | |
249 | * This function is similar to @drm_crtc_vblank_count but this | |
250 | * function interpolates to handle a race with vblank irq's. | |
251 | * | |
252 | * This is mostly useful for hardware that can obtain the scanout | |
253 | * position, but doesn't have a frame counter. | |
254 | */ | |
255 | u32 drm_accurate_vblank_count(struct drm_crtc *crtc) | |
256 | { | |
257 | struct drm_device *dev = crtc->dev; | |
258 | unsigned int pipe = drm_crtc_index(crtc); | |
259 | u32 vblank; | |
260 | unsigned long flags; | |
261 | ||
262 | WARN(!dev->driver->get_vblank_timestamp, | |
263 | "This function requires support for accurate vblank timestamps."); | |
264 | ||
265 | spin_lock_irqsave(&dev->vblank_time_lock, flags); | |
266 | ||
267 | drm_update_vblank_count(dev, pipe, 0); | |
268 | vblank = drm_vblank_count(dev, pipe); | |
269 | ||
270 | spin_unlock_irqrestore(&dev->vblank_time_lock, flags); | |
271 | ||
272 | return vblank; | |
273 | } | |
274 | EXPORT_SYMBOL(drm_accurate_vblank_count); | |
275 | ||
27641c3f MK |
276 | /* |
277 | * Disable vblank irq's on crtc, make sure that last vblank count | |
278 | * of hardware and corresponding consistent software vblank counter | |
279 | * are preserved, even if there are any spurious vblank irq's after | |
280 | * disable. | |
281 | */ | |
cc1ef118 | 282 | static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) |
27641c3f | 283 | { |
cc1ef118 | 284 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f | 285 | unsigned long irqflags; |
27641c3f MK |
286 | |
287 | /* Prevent vblank irq processing while disabling vblank irqs, | |
288 | * so no updates of timestamps or count can happen after we've | |
289 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 290 | */ |
27641c3f MK |
291 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
292 | ||
eb2ed66f LP |
293 | /* |
294 | * Only disable vblank interrupts if they're enabled. This avoids | |
295 | * calling the ->disable_vblank() operation in atomic context with the | |
296 | * hardware potentially runtime suspended. | |
297 | */ | |
298 | if (vblank->enabled) { | |
cc1ef118 | 299 | dev->driver->disable_vblank(dev, pipe); |
eb2ed66f LP |
300 | vblank->enabled = false; |
301 | } | |
27641c3f | 302 | |
4dfd6486 VS |
303 | /* |
304 | * Always update the count and timestamp to maintain the | |
305 | * appearance that the counter has been ticking all along until | |
306 | * this time. This makes the count account for the entire time | |
307 | * between drm_vblank_on() and drm_vblank_off(). | |
27641c3f | 308 | */ |
4dfd6486 | 309 | drm_update_vblank_count(dev, pipe, 0); |
27641c3f | 310 | |
27641c3f | 311 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
312 | } |
313 | ||
0a3e67a4 JB |
314 | static void vblank_disable_fn(unsigned long arg) |
315 | { | |
e69595c2 VS |
316 | struct drm_vblank_crtc *vblank = (void *)arg; |
317 | struct drm_device *dev = vblank->dev; | |
cc1ef118 | 318 | unsigned int pipe = vblank->pipe; |
0a3e67a4 | 319 | unsigned long irqflags; |
0a3e67a4 | 320 | |
e69595c2 VS |
321 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
322 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
cc1ef118 TR |
323 | DRM_DEBUG("disabling vblank on crtc %u\n", pipe); |
324 | vblank_disable_and_save(dev, pipe); | |
0a3e67a4 | 325 | } |
e69595c2 | 326 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
327 | } |
328 | ||
f5752b38 DV |
329 | /** |
330 | * drm_vblank_cleanup - cleanup vblank support | |
331 | * @dev: DRM device | |
332 | * | |
333 | * This function cleans up any resources allocated in drm_vblank_init. | |
334 | */ | |
52440211 | 335 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 336 | { |
cc1ef118 | 337 | unsigned int pipe; |
e69595c2 | 338 | |
0a3e67a4 JB |
339 | /* Bail if the driver didn't call drm_vblank_init() */ |
340 | if (dev->num_crtcs == 0) | |
341 | return; | |
342 | ||
cc1ef118 TR |
343 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { |
344 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
8a51d5be | 345 | |
3bff93d6 DV |
346 | WARN_ON(vblank->enabled && |
347 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
2368ffb1 | 348 | |
3bff93d6 | 349 | del_timer_sync(&vblank->disable_timer); |
e69595c2 | 350 | } |
0a3e67a4 | 351 | |
5380e929 | 352 | kfree(dev->vblank); |
0a3e67a4 JB |
353 | |
354 | dev->num_crtcs = 0; | |
355 | } | |
e77cef9c | 356 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 357 | |
f5752b38 DV |
358 | /** |
359 | * drm_vblank_init - initialize vblank support | |
cc1ef118 TR |
360 | * @dev: DRM device |
361 | * @num_crtcs: number of CRTCs supported by @dev | |
f5752b38 DV |
362 | * |
363 | * This function initializes vblank support for @num_crtcs display pipelines. | |
364 | * | |
365 | * Returns: | |
366 | * Zero on success or a negative error code on failure. | |
367 | */ | |
cc1ef118 | 368 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) |
0a3e67a4 | 369 | { |
cc1ef118 TR |
370 | int ret = -ENOMEM; |
371 | unsigned int i; | |
0a3e67a4 | 372 | |
0a3e67a4 | 373 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
374 | spin_lock_init(&dev->vblank_time_lock); |
375 | ||
0a3e67a4 JB |
376 | dev->num_crtcs = num_crtcs; |
377 | ||
5380e929 VS |
378 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
379 | if (!dev->vblank) | |
0a3e67a4 JB |
380 | goto err; |
381 | ||
e69595c2 | 382 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
383 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
384 | ||
385 | vblank->dev = dev; | |
cc1ef118 | 386 | vblank->pipe = i; |
8a51d5be VS |
387 | init_waitqueue_head(&vblank->queue); |
388 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
389 | (unsigned long)vblank); | |
d4055a9b | 390 | seqlock_init(&vblank->seqlock); |
e69595c2 | 391 | } |
27641c3f | 392 | |
8f6fce03 | 393 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
394 | |
395 | /* Driver specific high-precision vblank timestamping supported? */ | |
396 | if (dev->driver->get_vblank_timestamp) | |
397 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
398 | else | |
399 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
400 | ||
5a8b21b2 MK |
401 | /* Must have precise timestamping for reliable vblank instant disable */ |
402 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
403 | dev->vblank_disable_immediate = false; | |
404 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
405 | "get_vblank_timestamp == NULL\n"); | |
406 | } | |
407 | ||
0a3e67a4 JB |
408 | return 0; |
409 | ||
410 | err: | |
79a093ae | 411 | dev->num_crtcs = 0; |
0a3e67a4 JB |
412 | return ret; |
413 | } | |
414 | EXPORT_SYMBOL(drm_vblank_init); | |
415 | ||
28d52043 DA |
416 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
417 | { | |
418 | struct drm_device *dev = cookie; | |
419 | ||
420 | if (dev->driver->vgaarb_irq) { | |
421 | dev->driver->vgaarb_irq(dev, state); | |
422 | return; | |
423 | } | |
424 | ||
425 | if (!dev->irq_enabled) | |
426 | return; | |
427 | ||
5037f8ac JS |
428 | if (state) { |
429 | if (dev->driver->irq_uninstall) | |
430 | dev->driver->irq_uninstall(dev); | |
431 | } else { | |
432 | if (dev->driver->irq_preinstall) | |
433 | dev->driver->irq_preinstall(dev); | |
434 | if (dev->driver->irq_postinstall) | |
435 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
436 | } |
437 | } | |
438 | ||
1da177e4 | 439 | /** |
f5752b38 DV |
440 | * drm_irq_install - install IRQ handler |
441 | * @dev: DRM device | |
442 | * @irq: IRQ number to install the handler for | |
1da177e4 | 443 | * |
0a3e67a4 | 444 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
445 | * irq_preinstall() and irq_postinstall() functions before and after the |
446 | * installation. | |
447 | * | |
448 | * This is the simplified helper interface provided for drivers with no special | |
449 | * needs. Drivers which need to install interrupt handlers for multiple | |
450 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
451 | * that vblank interrupts are available. | |
452 | * | |
453 | * Returns: | |
454 | * Zero on success or a negative error code on failure. | |
1da177e4 | 455 | */ |
bb0f1b5c | 456 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 457 | { |
4a1b0714 | 458 | int ret; |
b5e89ed5 | 459 | unsigned long sh_flags = 0; |
1da177e4 LT |
460 | |
461 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
462 | return -EINVAL; | |
463 | ||
7c1a38e3 | 464 | if (irq == 0) |
1da177e4 LT |
465 | return -EINVAL; |
466 | ||
1da177e4 | 467 | /* Driver must have been initialized */ |
e090c53b | 468 | if (!dev->dev_private) |
1da177e4 | 469 | return -EINVAL; |
1da177e4 | 470 | |
e090c53b | 471 | if (dev->irq_enabled) |
1da177e4 | 472 | return -EBUSY; |
4423843c | 473 | dev->irq_enabled = true; |
1da177e4 | 474 | |
7c1a38e3 | 475 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 476 | |
b5e89ed5 | 477 | /* Before installing handler */ |
5037f8ac JS |
478 | if (dev->driver->irq_preinstall) |
479 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 480 | |
b5e89ed5 | 481 | /* Install handler */ |
1da177e4 | 482 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 483 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 484 | |
7c1a38e3 | 485 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 486 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 487 | |
b5e89ed5 | 488 | if (ret < 0) { |
4423843c | 489 | dev->irq_enabled = false; |
1da177e4 LT |
490 | return ret; |
491 | } | |
492 | ||
28d52043 DA |
493 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
494 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
495 | ||
b5e89ed5 | 496 | /* After installing handler */ |
5037f8ac JS |
497 | if (dev->driver->irq_postinstall) |
498 | ret = dev->driver->irq_postinstall(dev); | |
499 | ||
0a3e67a4 | 500 | if (ret < 0) { |
4423843c | 501 | dev->irq_enabled = false; |
e1c44acc JS |
502 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
503 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
7c1a38e3 DV |
504 | free_irq(irq, dev); |
505 | } else { | |
506 | dev->irq = irq; | |
0a3e67a4 | 507 | } |
1da177e4 | 508 | |
0a3e67a4 | 509 | return ret; |
1da177e4 | 510 | } |
0a3e67a4 | 511 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
512 | |
513 | /** | |
f5752b38 DV |
514 | * drm_irq_uninstall - uninstall the IRQ handler |
515 | * @dev: DRM device | |
516 | * | |
517 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
518 | * This should only be called by drivers which used drm_irq_install() to set up | |
519 | * their interrupt handler. Other drivers must only reset | |
520 | * drm_device->irq_enabled to false. | |
1da177e4 | 521 | * |
f5752b38 DV |
522 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
523 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
524 | * the same function through an ioctl. | |
1da177e4 | 525 | * |
f5752b38 DV |
526 | * Returns: |
527 | * Zero on success or a negative error code on failure. | |
1da177e4 | 528 | */ |
27641c3f | 529 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 530 | { |
dc1336ff | 531 | unsigned long irqflags; |
4423843c VS |
532 | bool irq_enabled; |
533 | int i; | |
1da177e4 LT |
534 | |
535 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
536 | return -EINVAL; | |
537 | ||
1da177e4 | 538 | irq_enabled = dev->irq_enabled; |
4423843c | 539 | dev->irq_enabled = false; |
1da177e4 | 540 | |
dc1336ff | 541 | /* |
3bff93d6 DV |
542 | * Wake up any waiters so they don't hang. This is just to paper over |
543 | * isssues for UMS drivers which aren't in full control of their | |
544 | * vblank/irq handling. KMS drivers must ensure that vblanks are all | |
545 | * disabled when uninstalling the irq handler. | |
dc1336ff | 546 | */ |
bde4889a BS |
547 | if (dev->num_crtcs) { |
548 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
549 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
550 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
551 | ||
3bff93d6 DV |
552 | if (!vblank->enabled) |
553 | continue; | |
554 | ||
555 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
556 | ||
557 | vblank_disable_and_save(dev, i); | |
8a51d5be | 558 | wake_up(&vblank->queue); |
bde4889a BS |
559 | } |
560 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 561 | } |
dc1336ff | 562 | |
b5e89ed5 | 563 | if (!irq_enabled) |
1da177e4 LT |
564 | return -EINVAL; |
565 | ||
7c1a38e3 | 566 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 567 | |
28d52043 DA |
568 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
569 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
570 | ||
5037f8ac JS |
571 | if (dev->driver->irq_uninstall) |
572 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 573 | |
7c1a38e3 | 574 | free_irq(dev->irq, dev); |
1da177e4 LT |
575 | |
576 | return 0; | |
577 | } | |
578 | EXPORT_SYMBOL(drm_irq_uninstall); | |
579 | ||
f5752b38 | 580 | /* |
1da177e4 LT |
581 | * IRQ control ioctl. |
582 | * | |
583 | * \param inode device inode. | |
6c340eac | 584 | * \param file_priv DRM file private. |
1da177e4 LT |
585 | * \param cmd command. |
586 | * \param arg user argument, pointing to a drm_control structure. | |
587 | * \return zero on success or a negative number on failure. | |
588 | * | |
589 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
590 | */ | |
c153f45f EA |
591 | int drm_control(struct drm_device *dev, void *data, |
592 | struct drm_file *file_priv) | |
1da177e4 | 593 | { |
c153f45f | 594 | struct drm_control *ctl = data; |
a319c1a4 | 595 | int ret = 0, irq; |
b5e89ed5 | 596 | |
27641c3f MK |
597 | /* if we haven't irq we fallback for compatibility reasons - |
598 | * this used to be a separate function in drm_dma.h | |
599 | */ | |
1da177e4 | 600 | |
22471cf6 DV |
601 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
602 | return 0; | |
603 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
604 | return 0; | |
605 | /* UMS was only ever support on pci devices. */ | |
606 | if (WARN_ON(!dev->pdev)) | |
607 | return -EINVAL; | |
1da177e4 | 608 | |
c153f45f | 609 | switch (ctl->func) { |
1da177e4 | 610 | case DRM_INST_HANDLER: |
a319c1a4 DV |
611 | irq = dev->pdev->irq; |
612 | ||
1da177e4 | 613 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 614 | ctl->irq != irq) |
1da177e4 | 615 | return -EINVAL; |
e090c53b | 616 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 617 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
618 | mutex_unlock(&dev->struct_mutex); |
619 | ||
620 | return ret; | |
1da177e4 | 621 | case DRM_UNINST_HANDLER: |
e090c53b DV |
622 | mutex_lock(&dev->struct_mutex); |
623 | ret = drm_irq_uninstall(dev); | |
624 | mutex_unlock(&dev->struct_mutex); | |
625 | ||
626 | return ret; | |
1da177e4 LT |
627 | default: |
628 | return -EINVAL; | |
629 | } | |
630 | } | |
631 | ||
27641c3f | 632 | /** |
f5752b38 DV |
633 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
634 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
635 | * @mode: display mode containing the scanout timings | |
27641c3f | 636 | * |
21b21560 VS |
637 | * Calculate and store various constants which are later |
638 | * needed by vblank and swap-completion timestamping, e.g, | |
639 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 640 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 641 | * things like panel scaling or other adjustments into account. |
27641c3f | 642 | */ |
545cdd55 VS |
643 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
644 | const struct drm_display_mode *mode) | |
27641c3f | 645 | { |
0c545ac4 VS |
646 | struct drm_device *dev = crtc->dev; |
647 | unsigned int pipe = drm_crtc_index(crtc); | |
648 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
20b20203 | 649 | int linedur_ns = 0, framedur_ns = 0; |
77666b72 | 650 | int dotclock = mode->crtc_clock; |
27641c3f | 651 | |
0c545ac4 VS |
652 | if (!dev->num_crtcs) |
653 | return; | |
654 | ||
655 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
656 | return; | |
657 | ||
27641c3f MK |
658 | /* Valid dotclock? */ |
659 | if (dotclock > 0) { | |
0dae35a3 VS |
660 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
661 | ||
662 | /* | |
663 | * Convert scanline length in pixels and video | |
20b20203 VS |
664 | * dot clock to line duration and frame duration |
665 | * in nanoseconds: | |
27641c3f | 666 | */ |
0dae35a3 VS |
667 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); |
668 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
669 | |
670 | /* | |
671 | * Fields of interlaced scanout modes are only half a frame duration. | |
672 | */ | |
673 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
674 | framedur_ns /= 2; | |
27641c3f | 675 | } else |
cc1ef118 | 676 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", |
27641c3f MK |
677 | crtc->base.id); |
678 | ||
eba1f35d VS |
679 | vblank->linedur_ns = linedur_ns; |
680 | vblank->framedur_ns = framedur_ns; | |
27641c3f | 681 | |
cc1ef118 | 682 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", |
545cdd55 VS |
683 | crtc->base.id, mode->crtc_htotal, |
684 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
20b20203 VS |
685 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n", |
686 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
27641c3f MK |
687 | } |
688 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
689 | ||
690 | /** | |
f5752b38 DV |
691 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
692 | * @dev: DRM device | |
cc1ef118 | 693 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
f5752b38 DV |
694 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
695 | * On return contains true maximum error of timestamp | |
696 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
697 | * @flags: Flags to pass to driver: | |
698 | * 0 = Default, | |
699 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
f5752b38 DV |
700 | * @mode: mode which defines the scanout timings |
701 | * | |
702 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
703 | * timings and current video scanout position of a CRTC. This can be called from | |
704 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
705 | * actual timestamping. | |
27641c3f MK |
706 | * |
707 | * Should return timestamps conforming to the OML_sync_control OpenML | |
708 | * extension specification. The timestamp corresponds to the end of | |
709 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
710 | * pixel in the following video frame. | |
711 | * | |
712 | * Requires support for optional dev->driver->get_scanout_position() | |
713 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
714 | * that corresponds to the true scanout timing. | |
715 | * | |
716 | * The current implementation only handles standard video modes. It | |
717 | * returns as no operation if a doublescan or interlaced video mode is | |
718 | * active. Higher level code is expected to handle this. | |
719 | * | |
f5752b38 DV |
720 | * Returns: |
721 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
722 | * video mode: |
723 | * | |
f5752b38 | 724 | * -EINVAL - Invalid CRTC. |
27641c3f MK |
725 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
726 | * -ENOTSUPP - Function not supported in current display mode. | |
727 | * -EIO - Failed, e.g., due to failed scanout position query. | |
728 | * | |
729 | * Returns or'ed positive status flags on success: | |
730 | * | |
731 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
732 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
733 | * | |
734 | */ | |
cc1ef118 TR |
735 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, |
736 | unsigned int pipe, | |
27641c3f MK |
737 | int *max_error, |
738 | struct timeval *vblank_time, | |
739 | unsigned flags, | |
7da903ef | 740 | const struct drm_display_mode *mode) |
27641c3f | 741 | { |
e62f2f5a | 742 | struct timeval tv_etime; |
d2cb58c8 | 743 | ktime_t stime, etime; |
ad1716ec VS |
744 | unsigned int vbl_status; |
745 | int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
27641c3f | 746 | int vpos, hpos, i; |
3bb403bf | 747 | int delta_ns, duration_ns; |
27641c3f | 748 | |
cc1ef118 TR |
749 | if (pipe >= dev->num_crtcs) { |
750 | DRM_ERROR("Invalid crtc %u\n", pipe); | |
27641c3f MK |
751 | return -EINVAL; |
752 | } | |
753 | ||
754 | /* Scanout position query not supported? Should not happen. */ | |
755 | if (!dev->driver->get_scanout_position) { | |
756 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
757 | return -EIO; | |
758 | } | |
759 | ||
27641c3f MK |
760 | /* If mode timing undefined, just return as no-op: |
761 | * Happens during initial modesetting of a crtc. | |
762 | */ | |
3bb403bf | 763 | if (mode->crtc_clock == 0) { |
cc1ef118 | 764 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); |
27641c3f MK |
765 | return -EAGAIN; |
766 | } | |
767 | ||
27641c3f MK |
768 | /* Get current scanout position with system timestamp. |
769 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
770 | * if single query takes longer than max_error nanoseconds. | |
771 | * | |
772 | * This guarantees a tight bound on maximum error if | |
773 | * code gets preempted or delayed for some reason. | |
774 | */ | |
775 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
776 | /* |
777 | * Get vertical and horizontal scanout position vpos, hpos, | |
778 | * and bounding timestamps stime, etime, pre/post query. | |
779 | */ | |
3bb403bf VS |
780 | vbl_status = dev->driver->get_scanout_position(dev, pipe, flags, |
781 | &vpos, &hpos, | |
782 | &stime, &etime, | |
783 | mode); | |
27641c3f | 784 | |
27641c3f MK |
785 | /* Return as no-op if scanout query unsupported or failed. */ |
786 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
ad1716ec | 787 | DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n", |
cc1ef118 | 788 | pipe, vbl_status); |
27641c3f MK |
789 | return -EIO; |
790 | } | |
791 | ||
8f6fce03 | 792 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 793 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
794 | |
795 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 796 | if (duration_ns <= *max_error) |
27641c3f MK |
797 | break; |
798 | } | |
799 | ||
800 | /* Noisy system timing? */ | |
801 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
cc1ef118 TR |
802 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", |
803 | pipe, duration_ns/1000, *max_error/1000, i); | |
27641c3f MK |
804 | } |
805 | ||
806 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 807 | *max_error = duration_ns; |
27641c3f MK |
808 | |
809 | /* Check if in vblank area: | |
810 | * vpos is >=0 in video scanout area, but negative | |
811 | * within vblank area, counting down the number of lines until | |
812 | * start of scanout. | |
813 | */ | |
ad1716ec VS |
814 | if (vbl_status & DRM_SCANOUTPOS_IN_VBLANK) |
815 | ret |= DRM_VBLANKTIME_IN_VBLANK; | |
27641c3f MK |
816 | |
817 | /* Convert scanout position into elapsed time at raw_time query | |
818 | * since start of scanout at first display scanline. delta_ns | |
819 | * can be negative if start of scanout hasn't happened yet. | |
820 | */ | |
3bb403bf VS |
821 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), |
822 | mode->crtc_clock); | |
27641c3f | 823 | |
c61eef72 | 824 | if (!drm_timestamp_monotonic) |
d2cb58c8 | 825 | etime = ktime_mono_to_real(etime); |
c61eef72 | 826 | |
e62f2f5a ID |
827 | /* save this only for debugging purposes */ |
828 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
829 | /* Subtract time delta from raw timestamp to get final |
830 | * vblank_time timestamp for end of vblank. | |
831 | */ | |
a91d7b91 | 832 | etime = ktime_sub_ns(etime, delta_ns); |
e62f2f5a | 833 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 834 | |
235fabe0 VS |
835 | DRM_DEBUG_VBL("crtc %u : v 0x%x p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
836 | pipe, vbl_status, hpos, vpos, | |
837 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, | |
838 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, | |
839 | duration_ns/1000, i); | |
27641c3f | 840 | |
ad1716ec | 841 | return ret; |
27641c3f MK |
842 | } |
843 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
844 | ||
c61eef72 ID |
845 | static struct timeval get_drm_timestamp(void) |
846 | { | |
847 | ktime_t now; | |
848 | ||
d2cb58c8 | 849 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
c61eef72 ID |
850 | return ktime_to_timeval(now); |
851 | } | |
852 | ||
27641c3f MK |
853 | /** |
854 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
4dfd909f | 855 | * vblank interval |
27641c3f | 856 | * @dev: DRM device |
cc1ef118 | 857 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
27641c3f MK |
858 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
859 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
860 | * 0 = Default, |
861 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
862 | * |
863 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 864 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
865 | * compute the timestamp with a high-precision GPU specific method. |
866 | * | |
867 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
868 | * call, i.e., it isn't very precisely locked to the true vblank. | |
869 | * | |
f5752b38 | 870 | * Returns: |
fb446a1a | 871 | * True if timestamp is considered to be very precise, false otherwise. |
27641c3f | 872 | */ |
fb446a1a | 873 | static bool |
cc1ef118 | 874 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a | 875 | struct timeval *tvblank, unsigned flags) |
27641c3f | 876 | { |
4a1b0714 | 877 | int ret; |
27641c3f MK |
878 | |
879 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
880 | int max_error = (int) drm_timestamp_precision * 1000; | |
881 | ||
882 | /* Query driver if possible and precision timestamping enabled. */ | |
883 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
cc1ef118 | 884 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, |
27641c3f MK |
885 | tvblank, flags); |
886 | if (ret > 0) | |
fb446a1a | 887 | return true; |
27641c3f MK |
888 | } |
889 | ||
890 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 891 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 892 | */ |
c61eef72 | 893 | *tvblank = get_drm_timestamp(); |
27641c3f | 894 | |
fb446a1a | 895 | return false; |
27641c3f | 896 | } |
27641c3f | 897 | |
0a3e67a4 JB |
898 | /** |
899 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
900 | * @dev: DRM device | |
cc1ef118 | 901 | * @pipe: index of CRTC for which to retrieve the counter |
0a3e67a4 JB |
902 | * |
903 | * Fetches the "cooked" vblank count value that represents the number of | |
904 | * vblank events since the system was booted, including lost events due to | |
905 | * modesetting activity. | |
f5752b38 | 906 | * |
96d3f91e TR |
907 | * This is the legacy version of drm_crtc_vblank_count(). |
908 | * | |
f5752b38 DV |
909 | * Returns: |
910 | * The software vblank counter. | |
0a3e67a4 | 911 | */ |
88e72717 | 912 | u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 913 | { |
cc1ef118 | 914 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 915 | |
cc1ef118 | 916 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 | 917 | return 0; |
7d1de851 | 918 | |
99264a61 | 919 | return vblank->count; |
0a3e67a4 JB |
920 | } |
921 | EXPORT_SYMBOL(drm_vblank_count); | |
922 | ||
96d3f91e TR |
923 | /** |
924 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
925 | * @crtc: which counter to retrieve | |
926 | * | |
927 | * Fetches the "cooked" vblank count value that represents the number of | |
928 | * vblank events since the system was booted, including lost events due to | |
929 | * modesetting activity. | |
930 | * | |
931 | * This is the native KMS version of drm_vblank_count(). | |
932 | * | |
933 | * Returns: | |
934 | * The software vblank counter. | |
935 | */ | |
936 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) | |
937 | { | |
938 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
939 | } | |
940 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
941 | ||
27641c3f | 942 | /** |
cc1ef118 TR |
943 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the |
944 | * system timestamp corresponding to that vblank counter value. | |
27641c3f | 945 | * @dev: DRM device |
cc1ef118 | 946 | * @pipe: index of CRTC whose counter to retrieve |
27641c3f MK |
947 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. |
948 | * | |
949 | * Fetches the "cooked" vblank count value that represents the number of | |
950 | * vblank events since the system was booted, including lost events due to | |
951 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 952 | * of the vblank interval that corresponds to the current vblank counter value. |
cf648305 TR |
953 | * |
954 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
27641c3f | 955 | */ |
cc1ef118 | 956 | u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, |
27641c3f MK |
957 | struct timeval *vblanktime) |
958 | { | |
cc1ef118 | 959 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
d4055a9b MA |
960 | u32 vblank_count; |
961 | unsigned int seq; | |
27641c3f | 962 | |
cc1ef118 | 963 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
964 | return 0; |
965 | ||
27641c3f | 966 | do { |
d4055a9b MA |
967 | seq = read_seqbegin(&vblank->seqlock); |
968 | vblank_count = vblank->count; | |
969 | *vblanktime = vblank->time; | |
970 | } while (read_seqretry(&vblank->seqlock, seq)); | |
27641c3f | 971 | |
d4055a9b | 972 | return vblank_count; |
27641c3f MK |
973 | } |
974 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
975 | ||
cf648305 TR |
976 | /** |
977 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
978 | * and the system timestamp corresponding to that vblank counter value | |
979 | * @crtc: which counter to retrieve | |
980 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
981 | * | |
982 | * Fetches the "cooked" vblank count value that represents the number of | |
983 | * vblank events since the system was booted, including lost events due to | |
984 | * modesetting activity. Returns corresponding system timestamp of the time | |
985 | * of the vblank interval that corresponds to the current vblank counter value. | |
986 | * | |
987 | * This is the native KMS version of drm_vblank_count_and_time(). | |
988 | */ | |
989 | u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, | |
990 | struct timeval *vblanktime) | |
991 | { | |
992 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
993 | vblanktime); | |
994 | } | |
995 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
996 | ||
c6eefa17 RC |
997 | static void send_vblank_event(struct drm_device *dev, |
998 | struct drm_pending_vblank_event *e, | |
999 | unsigned long seq, struct timeval *now) | |
1000 | { | |
c6eefa17 RC |
1001 | e->event.sequence = seq; |
1002 | e->event.tv_sec = now->tv_sec; | |
1003 | e->event.tv_usec = now->tv_usec; | |
1004 | ||
fb740cf2 DV |
1005 | drm_send_event_locked(dev, &e->base); |
1006 | ||
c6eefa17 RC |
1007 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, |
1008 | e->event.sequence); | |
1009 | } | |
1010 | ||
bbc8764f DV |
1011 | /** |
1012 | * drm_arm_vblank_event - arm vblank event after pageflip | |
1013 | * @dev: DRM device | |
1014 | * @pipe: CRTC index | |
1015 | * @e: the event to prepare to send | |
1016 | * | |
1017 | * A lot of drivers need to generate vblank events for the very next vblank | |
1018 | * interrupt. For example when the page flip interrupt happens when the page | |
1019 | * flip gets armed, but not when it actually executes within the next vblank | |
1020 | * period. This helper function implements exactly the required vblank arming | |
1021 | * behaviour. | |
1022 | * | |
1023 | * Caller must hold event lock. Caller must also hold a vblank reference for | |
1024 | * the event @e, which will be dropped when the next vblank arrives. | |
1025 | * | |
1026 | * This is the legacy version of drm_crtc_arm_vblank_event(). | |
1027 | */ | |
1028 | void drm_arm_vblank_event(struct drm_device *dev, unsigned int pipe, | |
1029 | struct drm_pending_vblank_event *e) | |
1030 | { | |
1031 | assert_spin_locked(&dev->event_lock); | |
1032 | ||
1033 | e->pipe = pipe; | |
1034 | e->event.sequence = drm_vblank_count(dev, pipe); | |
1035 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
1036 | } | |
1037 | EXPORT_SYMBOL(drm_arm_vblank_event); | |
1038 | ||
1039 | /** | |
1040 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip | |
1041 | * @crtc: the source CRTC of the vblank event | |
1042 | * @e: the event to send | |
1043 | * | |
1044 | * A lot of drivers need to generate vblank events for the very next vblank | |
1045 | * interrupt. For example when the page flip interrupt happens when the page | |
1046 | * flip gets armed, but not when it actually executes within the next vblank | |
1047 | * period. This helper function implements exactly the required vblank arming | |
1048 | * behaviour. | |
1049 | * | |
1050 | * Caller must hold event lock. Caller must also hold a vblank reference for | |
1051 | * the event @e, which will be dropped when the next vblank arrives. | |
1052 | * | |
1053 | * This is the native KMS version of drm_arm_vblank_event(). | |
1054 | */ | |
1055 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, | |
1056 | struct drm_pending_vblank_event *e) | |
1057 | { | |
1058 | drm_arm_vblank_event(crtc->dev, drm_crtc_index(crtc), e); | |
1059 | } | |
1060 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); | |
1061 | ||
c6eefa17 RC |
1062 | /** |
1063 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
1064 | * @dev: DRM device | |
cc1ef118 | 1065 | * @pipe: CRTC index |
c6eefa17 RC |
1066 | * @e: the event to send |
1067 | * | |
1068 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
1069 | * Caller must hold event lock. | |
a4d7b30d TR |
1070 | * |
1071 | * This is the legacy version of drm_crtc_send_vblank_event(). | |
c6eefa17 | 1072 | */ |
cc1ef118 TR |
1073 | void drm_send_vblank_event(struct drm_device *dev, unsigned int pipe, |
1074 | struct drm_pending_vblank_event *e) | |
c6eefa17 RC |
1075 | { |
1076 | struct timeval now; | |
1077 | unsigned int seq; | |
4dfd909f | 1078 | |
2a7d3d6d | 1079 | if (dev->num_crtcs > 0) { |
cc1ef118 | 1080 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c6eefa17 RC |
1081 | } else { |
1082 | seq = 0; | |
c61eef72 ID |
1083 | |
1084 | now = get_drm_timestamp(); | |
c6eefa17 | 1085 | } |
cc1ef118 | 1086 | e->pipe = pipe; |
c6eefa17 RC |
1087 | send_vblank_event(dev, e, seq, &now); |
1088 | } | |
1089 | EXPORT_SYMBOL(drm_send_vblank_event); | |
1090 | ||
a4d7b30d TR |
1091 | /** |
1092 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
1093 | * @crtc: the source CRTC of the vblank event | |
1094 | * @e: the event to send | |
1095 | * | |
1096 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
1097 | * Caller must hold event lock. | |
1098 | * | |
1099 | * This is the native KMS version of drm_send_vblank_event(). | |
1100 | */ | |
1101 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
1102 | struct drm_pending_vblank_event *e) | |
1103 | { | |
1104 | drm_send_vblank_event(crtc->dev, drm_crtc_index(crtc), e); | |
1105 | } | |
1106 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
1107 | ||
f2752282 VS |
1108 | /** |
1109 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
1110 | * @dev: DRM device | |
cc1ef118 | 1111 | * @pipe: CRTC index |
c30e11fc TR |
1112 | * |
1113 | * Returns: | |
1114 | * Zero on success or a negative error code on failure. | |
f2752282 | 1115 | */ |
cc1ef118 | 1116 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1117 | { |
cc1ef118 | 1118 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1119 | int ret = 0; |
1120 | ||
1121 | assert_spin_locked(&dev->vbl_lock); | |
1122 | ||
1123 | spin_lock(&dev->vblank_time_lock); | |
1124 | ||
8a51d5be | 1125 | if (!vblank->enabled) { |
1cfb80b1 DV |
1126 | /* |
1127 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
1128 | * All vblank count & timestamp updates are held off |
1129 | * until we are done reinitializing master counter and | |
1130 | * timestamps. Filtercode in drm_handle_vblank() will | |
1131 | * prevent double-accounting of same vblank interval. | |
1132 | */ | |
cc1ef118 TR |
1133 | ret = dev->driver->enable_vblank(dev, pipe); |
1134 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); | |
f2752282 | 1135 | if (ret) |
8a51d5be | 1136 | atomic_dec(&vblank->refcount); |
f2752282 | 1137 | else { |
8a51d5be | 1138 | vblank->enabled = true; |
a6e610dc | 1139 | drm_update_vblank_count(dev, pipe, 0); |
f2752282 VS |
1140 | } |
1141 | } | |
1142 | ||
1143 | spin_unlock(&dev->vblank_time_lock); | |
1144 | ||
1145 | return ret; | |
1146 | } | |
1147 | ||
0a3e67a4 JB |
1148 | /** |
1149 | * drm_vblank_get - get a reference count on vblank events | |
1150 | * @dev: DRM device | |
cc1ef118 | 1151 | * @pipe: index of CRTC to own |
0a3e67a4 JB |
1152 | * |
1153 | * Acquire a reference count on vblank events to avoid having them disabled | |
1154 | * while in use. | |
1155 | * | |
89dd6a4b DV |
1156 | * This is the legacy version of drm_crtc_vblank_get(). |
1157 | * | |
f5752b38 | 1158 | * Returns: |
c30e11fc | 1159 | * Zero on success or a negative error code on failure. |
0a3e67a4 | 1160 | */ |
cc1ef118 | 1161 | int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1162 | { |
cc1ef118 | 1163 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
97cbc883 | 1164 | unsigned long irqflags; |
0a3e67a4 JB |
1165 | int ret = 0; |
1166 | ||
16e3247d GH |
1167 | if (!dev->num_crtcs) |
1168 | return -EINVAL; | |
1169 | ||
cc1ef118 | 1170 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1171 | return -EINVAL; |
1172 | ||
0a3e67a4 JB |
1173 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1174 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 1175 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
cc1ef118 | 1176 | ret = drm_vblank_enable(dev, pipe); |
778c9026 | 1177 | } else { |
8a51d5be VS |
1178 | if (!vblank->enabled) { |
1179 | atomic_dec(&vblank->refcount); | |
778c9026 | 1180 | ret = -EINVAL; |
0a3e67a4 JB |
1181 | } |
1182 | } | |
1183 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1184 | ||
1185 | return ret; | |
1186 | } | |
1187 | EXPORT_SYMBOL(drm_vblank_get); | |
1188 | ||
89dd6a4b DV |
1189 | /** |
1190 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1191 | * @crtc: which CRTC to own | |
1192 | * | |
1193 | * Acquire a reference count on vblank events to avoid having them disabled | |
1194 | * while in use. | |
1195 | * | |
30b79f06 | 1196 | * This is the native kms version of drm_vblank_get(). |
89dd6a4b DV |
1197 | * |
1198 | * Returns: | |
c30e11fc | 1199 | * Zero on success or a negative error code on failure. |
89dd6a4b DV |
1200 | */ |
1201 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1202 | { | |
1203 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1204 | } | |
1205 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1206 | ||
0a3e67a4 | 1207 | /** |
cc1ef118 | 1208 | * drm_vblank_put - release ownership of vblank events |
0a3e67a4 | 1209 | * @dev: DRM device |
cc1ef118 | 1210 | * @pipe: index of CRTC to release |
0a3e67a4 JB |
1211 | * |
1212 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 1213 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
1214 | * |
1215 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 | 1216 | */ |
cc1ef118 | 1217 | void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1218 | { |
cc1ef118 | 1219 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1220 | |
cc1ef118 | 1221 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7f907bf2 | 1222 | return; |
b3f5e732 | 1223 | |
7d1de851 | 1224 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) |
e6ae8687 RC |
1225 | return; |
1226 | ||
0a3e67a4 | 1227 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1228 | if (atomic_dec_and_test(&vblank->refcount)) { |
ab8905f1 DV |
1229 | if (drm_vblank_offdelay == 0) |
1230 | return; | |
1231 | else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) | |
4ed0ce3d | 1232 | vblank_disable_fn((unsigned long)vblank); |
ab8905f1 | 1233 | else |
4ed0ce3d VS |
1234 | mod_timer(&vblank->disable_timer, |
1235 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1236 | } | |
0a3e67a4 JB |
1237 | } |
1238 | EXPORT_SYMBOL(drm_vblank_put); | |
1239 | ||
89dd6a4b DV |
1240 | /** |
1241 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1242 | * @crtc: which counter to give up | |
1243 | * | |
1244 | * Release ownership of a given vblank counter, turning off interrupts | |
1245 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1246 | * | |
1247 | * This is the native kms version of drm_vblank_put(). | |
1248 | */ | |
1249 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1250 | { | |
1251 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1252 | } | |
1253 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1254 | ||
e8450f51 DV |
1255 | /** |
1256 | * drm_wait_one_vblank - wait for one vblank | |
1257 | * @dev: DRM device | |
cc1ef118 | 1258 | * @pipe: CRTC index |
e8450f51 | 1259 | * |
1da248a5 VS |
1260 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. |
1261 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
e8450f51 DV |
1262 | * due to lack of driver support or because the crtc is off. |
1263 | */ | |
cc1ef118 | 1264 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) |
e8450f51 | 1265 | { |
cc1ef118 | 1266 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
e8450f51 DV |
1267 | int ret; |
1268 | u32 last; | |
1269 | ||
cc1ef118 | 1270 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1271 | return; |
1272 | ||
cc1ef118 TR |
1273 | ret = drm_vblank_get(dev, pipe); |
1274 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |
e8450f51 DV |
1275 | return; |
1276 | ||
cc1ef118 | 1277 | last = drm_vblank_count(dev, pipe); |
e8450f51 | 1278 | |
cc1ef118 TR |
1279 | ret = wait_event_timeout(vblank->queue, |
1280 | last != drm_vblank_count(dev, pipe), | |
e8450f51 DV |
1281 | msecs_to_jiffies(100)); |
1282 | ||
cc1ef118 | 1283 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); |
e8450f51 | 1284 | |
cc1ef118 | 1285 | drm_vblank_put(dev, pipe); |
e8450f51 DV |
1286 | } |
1287 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1288 | ||
1289 | /** | |
1290 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1291 | * @crtc: DRM crtc | |
1292 | * | |
1293 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1294 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1295 | * due to lack of driver support or because the crtc is off. | |
1296 | */ | |
1297 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1298 | { | |
1299 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1300 | } | |
1301 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1302 | ||
c6eefa17 RC |
1303 | /** |
1304 | * drm_vblank_off - disable vblank events on a CRTC | |
1305 | * @dev: DRM device | |
cc1ef118 | 1306 | * @pipe: CRTC index |
c6eefa17 | 1307 | * |
f5752b38 DV |
1308 | * Drivers can use this function to shut down the vblank interrupt handling when |
1309 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1310 | * stored so that drm_vblank_on() can restore it again. | |
1311 | * | |
1312 | * Drivers must use this function when the hardware vblank counter can get | |
1313 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1314 | * |
1315 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1316 | */ |
cc1ef118 | 1317 | void drm_vblank_off(struct drm_device *dev, unsigned int pipe) |
778c9026 | 1318 | { |
cc1ef118 | 1319 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
498548ec CJHR |
1320 | struct drm_pending_vblank_event *e, *t; |
1321 | struct timeval now; | |
778c9026 | 1322 | unsigned long irqflags; |
498548ec | 1323 | unsigned int seq; |
778c9026 | 1324 | |
cc1ef118 | 1325 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1326 | return; |
1327 | ||
56cc279b VS |
1328 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1329 | ||
1330 | spin_lock(&dev->vbl_lock); | |
e8235891 MK |
1331 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", |
1332 | pipe, vblank->enabled, vblank->inmodeset); | |
1333 | ||
1334 | /* Avoid redundant vblank disables without previous drm_vblank_on(). */ | |
1335 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) | |
1336 | vblank_disable_and_save(dev, pipe); | |
1337 | ||
8a51d5be | 1338 | wake_up(&vblank->queue); |
498548ec | 1339 | |
56cc279b VS |
1340 | /* |
1341 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1342 | * the vblank interrupt by bumping the refcount. | |
1343 | */ | |
1344 | if (!vblank->inmodeset) { | |
1345 | atomic_inc(&vblank->refcount); | |
1346 | vblank->inmodeset = 1; | |
1347 | } | |
1348 | spin_unlock(&dev->vbl_lock); | |
1349 | ||
498548ec | 1350 | /* Send any queued vblank events, lest the natives grow disquiet */ |
cc1ef118 | 1351 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
e7783ba3 | 1352 | |
498548ec | 1353 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
cc1ef118 | 1354 | if (e->pipe != pipe) |
498548ec | 1355 | continue; |
44844892 VS |
1356 | DRM_DEBUG("Sending premature vblank event on disable: " |
1357 | "wanted %d, current %d\n", | |
498548ec | 1358 | e->event.sequence, seq); |
c6eefa17 | 1359 | list_del(&e->base.link); |
cc1ef118 | 1360 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1361 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1362 | } |
56cc279b | 1363 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 LP |
1364 | } |
1365 | EXPORT_SYMBOL(drm_vblank_off); | |
1366 | ||
89dd6a4b DV |
1367 | /** |
1368 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1369 | * @crtc: CRTC in question | |
1370 | * | |
1371 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1372 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1373 | * stored so that drm_vblank_on can restore it again. | |
1374 | * | |
1375 | * Drivers must use this function when the hardware vblank counter can get | |
1376 | * reset, e.g. when suspending. | |
1377 | * | |
1378 | * This is the native kms version of drm_vblank_off(). | |
1379 | */ | |
1380 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1381 | { | |
1382 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1383 | } | |
1384 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1385 | ||
9625604c DV |
1386 | /** |
1387 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
2b193f02 | 1388 | * @crtc: CRTC in question |
9625604c DV |
1389 | * |
1390 | * Drivers can use this function to reset the vblank state to off at load time. | |
1391 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1392 | * drm_crtc_vblank_on() functions. The difference compared to | |
1393 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1394 | * and hence doesn't need to call any driver hooks. | |
1395 | */ | |
2b193f02 | 1396 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) |
9625604c | 1397 | { |
2b193f02 | 1398 | struct drm_device *dev = crtc->dev; |
9625604c | 1399 | unsigned long irqflags; |
2b193f02 | 1400 | unsigned int pipe = drm_crtc_index(crtc); |
1da248a5 | 1401 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
9625604c DV |
1402 | |
1403 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1404 | /* | |
1405 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1406 | * interrupt by bumping the refcount. | |
1407 | */ | |
1408 | if (!vblank->inmodeset) { | |
1409 | atomic_inc(&vblank->refcount); | |
1410 | vblank->inmodeset = 1; | |
1411 | } | |
1412 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1413 | ||
1414 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1415 | } | |
1416 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1417 | ||
f2752282 VS |
1418 | /** |
1419 | * drm_vblank_on - enable vblank events on a CRTC | |
1420 | * @dev: DRM device | |
cc1ef118 | 1421 | * @pipe: CRTC index |
f5752b38 DV |
1422 | * |
1423 | * This functions restores the vblank interrupt state captured with | |
1424 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1425 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
f5752b38 | 1426 | * in driver load code to reflect the current hardware state of the crtc. |
89dd6a4b DV |
1427 | * |
1428 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 | 1429 | */ |
cc1ef118 | 1430 | void drm_vblank_on(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1431 | { |
cc1ef118 | 1432 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1433 | unsigned long irqflags; |
1434 | ||
cc1ef118 | 1435 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1436 | return; |
1437 | ||
f2752282 | 1438 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
e8235891 MK |
1439 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", |
1440 | pipe, vblank->enabled, vblank->inmodeset); | |
1441 | ||
7ffd7a68 | 1442 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1443 | if (vblank->inmodeset) { |
1444 | atomic_dec(&vblank->refcount); | |
1445 | vblank->inmodeset = 0; | |
7ffd7a68 | 1446 | } |
f8ad028c | 1447 | |
4dfd6486 VS |
1448 | drm_reset_vblank_timestamp(dev, pipe); |
1449 | ||
cd19e52a VS |
1450 | /* |
1451 | * re-enable interrupts if there are users left, or the | |
1452 | * user wishes vblank interrupts to be enabled all the time. | |
1453 | */ | |
bb74fc1b | 1454 | if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) |
cc1ef118 | 1455 | WARN_ON(drm_vblank_enable(dev, pipe)); |
f2752282 VS |
1456 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1457 | } | |
1458 | EXPORT_SYMBOL(drm_vblank_on); | |
1459 | ||
89dd6a4b DV |
1460 | /** |
1461 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1462 | * @crtc: CRTC in question | |
1463 | * | |
1464 | * This functions restores the vblank interrupt state captured with | |
1465 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1466 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
89dd6a4b DV |
1467 | * in driver load code to reflect the current hardware state of the crtc. |
1468 | * | |
1469 | * This is the native kms version of drm_vblank_on(). | |
1470 | */ | |
1471 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1472 | { | |
1473 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1474 | } | |
1475 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1476 | ||
f453ba04 DA |
1477 | /** |
1478 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1479 | * @dev: DRM device | |
cc1ef118 | 1480 | * @pipe: CRTC index |
f453ba04 DA |
1481 | * |
1482 | * Account for vblank events across mode setting events, which will likely | |
1483 | * reset the hardware frame counter. | |
f5752b38 DV |
1484 | * |
1485 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1486 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1487 | * software-side vblank frame counting will ensure that there are no jumps or | |
1488 | * discontinuities. | |
1489 | * | |
1490 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1491 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1492 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1493 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1494 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1495 | * counters. | |
1496 | * | |
1497 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1498 | * again. | |
f453ba04 | 1499 | */ |
cc1ef118 | 1500 | void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe) |
f453ba04 | 1501 | { |
cc1ef118 | 1502 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1503 | |
b7ea85a4 | 1504 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1505 | if (!dev->num_crtcs) |
1506 | return; | |
e6ae8687 | 1507 | |
cc1ef118 | 1508 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1509 | return; |
1510 | ||
f453ba04 DA |
1511 | /* |
1512 | * To avoid all the problems that might happen if interrupts | |
1513 | * were enabled/disabled around or between these calls, we just | |
1514 | * have the kernel take a reference on the CRTC (just once though | |
1515 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1516 | * so that interrupts remain enabled in the interim. | |
1517 | */ | |
8a51d5be VS |
1518 | if (!vblank->inmodeset) { |
1519 | vblank->inmodeset = 0x1; | |
cc1ef118 | 1520 | if (drm_vblank_get(dev, pipe) == 0) |
8a51d5be | 1521 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1522 | } |
1523 | } | |
1524 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1525 | ||
f5752b38 DV |
1526 | /** |
1527 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1528 | * @dev: DRM device | |
cc1ef118 | 1529 | * @pipe: CRTC index |
f5752b38 DV |
1530 | * |
1531 | * This function again drops the temporary vblank reference acquired in | |
1532 | * drm_vblank_pre_modeset. | |
1533 | */ | |
cc1ef118 | 1534 | void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe) |
f453ba04 | 1535 | { |
cc1ef118 | 1536 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f453ba04 DA |
1537 | unsigned long irqflags; |
1538 | ||
b7ea85a4 HC |
1539 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1540 | if (!dev->num_crtcs) | |
1541 | return; | |
1542 | ||
cc1ef118 | 1543 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1544 | return; |
1545 | ||
8a51d5be | 1546 | if (vblank->inmodeset) { |
f453ba04 | 1547 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
c61934ed | 1548 | drm_reset_vblank_timestamp(dev, pipe); |
f453ba04 | 1549 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1550 | |
8a51d5be | 1551 | if (vblank->inmodeset & 0x2) |
cc1ef118 | 1552 | drm_vblank_put(dev, pipe); |
b3f5e732 | 1553 | |
8a51d5be | 1554 | vblank->inmodeset = 0; |
f453ba04 DA |
1555 | } |
1556 | } | |
1557 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1558 | ||
f5752b38 | 1559 | /* |
0a3e67a4 JB |
1560 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1561 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1562 | * | |
1563 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1564 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1565 | * | |
1566 | * Generally the counter will reset across mode sets. If interrupts are | |
1567 | * enabled around this call, we don't have to do anything since the counter | |
1568 | * will have already been incremented. | |
1569 | */ | |
1570 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1571 | struct drm_file *file_priv) | |
1572 | { | |
1573 | struct drm_modeset_ctl *modeset = data; | |
cc1ef118 | 1574 | unsigned int pipe; |
0a3e67a4 JB |
1575 | |
1576 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1577 | if (!dev->num_crtcs) | |
4a1b0714 | 1578 | return 0; |
0a3e67a4 | 1579 | |
29935554 LP |
1580 | /* KMS drivers handle this internally */ |
1581 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1582 | return 0; | |
1583 | ||
cc1ef118 TR |
1584 | pipe = modeset->crtc; |
1585 | if (pipe >= dev->num_crtcs) | |
4a1b0714 | 1586 | return -EINVAL; |
0a3e67a4 | 1587 | |
0a3e67a4 JB |
1588 | switch (modeset->cmd) { |
1589 | case _DRM_PRE_MODESET: | |
cc1ef118 | 1590 | drm_vblank_pre_modeset(dev, pipe); |
0a3e67a4 JB |
1591 | break; |
1592 | case _DRM_POST_MODESET: | |
cc1ef118 | 1593 | drm_vblank_post_modeset(dev, pipe); |
0a3e67a4 JB |
1594 | break; |
1595 | default: | |
4a1b0714 | 1596 | return -EINVAL; |
0a3e67a4 JB |
1597 | } |
1598 | ||
4a1b0714 | 1599 | return 0; |
0a3e67a4 JB |
1600 | } |
1601 | ||
cc1ef118 | 1602 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, |
c9a9c5e0 KH |
1603 | union drm_wait_vblank *vblwait, |
1604 | struct drm_file *file_priv) | |
1605 | { | |
ffe7c73a | 1606 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1607 | struct drm_pending_vblank_event *e; |
1608 | struct timeval now; | |
1609 | unsigned long flags; | |
1610 | unsigned int seq; | |
ea5d552c | 1611 | int ret; |
c9a9c5e0 | 1612 | |
f76511b9 | 1613 | e = kzalloc(sizeof(*e), GFP_KERNEL); |
ea5d552c CW |
1614 | if (e == NULL) { |
1615 | ret = -ENOMEM; | |
1616 | goto err_put; | |
1617 | } | |
c9a9c5e0 KH |
1618 | |
1619 | e->pipe = pipe; | |
b9c2c9ae | 1620 | e->base.pid = current->pid; |
c9a9c5e0 | 1621 | e->event.base.type = DRM_EVENT_VBLANK; |
f76511b9 | 1622 | e->event.base.length = sizeof(e->event); |
c9a9c5e0 | 1623 | e->event.user_data = vblwait->request.signal; |
c9a9c5e0 | 1624 | |
c9a9c5e0 KH |
1625 | spin_lock_irqsave(&dev->event_lock, flags); |
1626 | ||
ffe7c73a VS |
1627 | /* |
1628 | * drm_vblank_off() might have been called after we called | |
1629 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1630 | * around the vblank disable, so no need for further locking. | |
1631 | * The reference from drm_vblank_get() protects against | |
1632 | * vblank disable from another source. | |
1633 | */ | |
1634 | if (!vblank->enabled) { | |
1635 | ret = -EINVAL; | |
1636 | goto err_unlock; | |
1637 | } | |
1638 | ||
4020b220 DV |
1639 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, |
1640 | &e->event.base); | |
1641 | ||
1642 | if (ret) | |
ea5d552c | 1643 | goto err_unlock; |
c9a9c5e0 | 1644 | |
27641c3f MK |
1645 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1646 | ||
c9a9c5e0 KH |
1647 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1648 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1649 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1650 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1651 | } |
1652 | ||
cc1ef118 | 1653 | DRM_DEBUG("event on vblank count %d, current %d, crtc %u\n", |
c9a9c5e0 KH |
1654 | vblwait->request.sequence, seq, pipe); |
1655 | ||
b9c2c9ae JB |
1656 | trace_drm_vblank_event_queued(current->pid, pipe, |
1657 | vblwait->request.sequence); | |
1658 | ||
c9a9c5e0 KH |
1659 | e->event.sequence = vblwait->request.sequence; |
1660 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1661 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1662 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1663 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1664 | } else { |
a6778e9e | 1665 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1666 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1667 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1668 | } |
1669 | ||
1670 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1671 | ||
1672 | return 0; | |
ea5d552c CW |
1673 | |
1674 | err_unlock: | |
1675 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1676 | kfree(e); | |
1677 | err_put: | |
6f331623 | 1678 | drm_vblank_put(dev, pipe); |
ea5d552c | 1679 | return ret; |
c9a9c5e0 KH |
1680 | } |
1681 | ||
f5752b38 | 1682 | /* |
1da177e4 LT |
1683 | * Wait for VBLANK. |
1684 | * | |
1685 | * \param inode device inode. | |
6c340eac | 1686 | * \param file_priv DRM file private. |
1da177e4 LT |
1687 | * \param cmd command. |
1688 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1689 | * \return zero on success or a negative number on failure. | |
1690 | * | |
30b23634 EA |
1691 | * This function enables the vblank interrupt on the pipe requested, then |
1692 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1693 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1694 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1695 | */ |
0a3e67a4 JB |
1696 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1697 | struct drm_file *file_priv) | |
1da177e4 | 1698 | { |
8a51d5be | 1699 | struct drm_vblank_crtc *vblank; |
c153f45f | 1700 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1701 | int ret; |
cc1ef118 | 1702 | unsigned int flags, seq, pipe, high_pipe; |
1da177e4 | 1703 | |
4984979b DV |
1704 | if (!dev->irq_enabled) |
1705 | return -EINVAL; | |
1da177e4 | 1706 | |
30b23634 EA |
1707 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1708 | return -EINVAL; | |
1709 | ||
c153f45f | 1710 | if (vblwait->request.type & |
19b01b5f IH |
1711 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1712 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1713 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1714 | vblwait->request.type, |
19b01b5f IH |
1715 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1716 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MD |
1717 | return -EINVAL; |
1718 | } | |
1719 | ||
c153f45f | 1720 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
cc1ef118 TR |
1721 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1722 | if (high_pipe) | |
1723 | pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
19b01b5f | 1724 | else |
cc1ef118 TR |
1725 | pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1726 | if (pipe >= dev->num_crtcs) | |
776c9443 MD |
1727 | return -EINVAL; |
1728 | ||
cc1ef118 | 1729 | vblank = &dev->vblank[pipe]; |
8a51d5be | 1730 | |
cc1ef118 | 1731 | ret = drm_vblank_get(dev, pipe); |
0a3e67a4 | 1732 | if (ret) { |
8d3457ec | 1733 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1734 | return ret; |
1735 | } | |
cc1ef118 | 1736 | seq = drm_vblank_count(dev, pipe); |
776c9443 | 1737 | |
c153f45f | 1738 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1739 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1740 | vblwait->request.sequence += seq; |
1741 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1742 | case _DRM_VBLANK_ABSOLUTE: |
1743 | break; | |
1744 | default: | |
0a3e67a4 JB |
1745 | ret = -EINVAL; |
1746 | goto done; | |
1da177e4 LT |
1747 | } |
1748 | ||
a6778e9e IH |
1749 | if (flags & _DRM_VBLANK_EVENT) { |
1750 | /* must hold on to the vblank ref until the event fires | |
1751 | * drm_vblank_put will be called asynchronously | |
1752 | */ | |
cc1ef118 | 1753 | return drm_queue_vblank_event(dev, pipe, vblwait, file_priv); |
a6778e9e | 1754 | } |
c9a9c5e0 | 1755 | |
ab285d74 | 1756 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1757 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1758 | vblwait->request.sequence = seq + 1; | |
ab285d74 MD |
1759 | } |
1760 | ||
cc1ef118 TR |
1761 | DRM_DEBUG("waiting on vblank count %d, crtc %u\n", |
1762 | vblwait->request.sequence, pipe); | |
8a51d5be VS |
1763 | vblank->last_wait = vblwait->request.sequence; |
1764 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
cc1ef118 | 1765 | (((drm_vblank_count(dev, pipe) - |
30b23634 | 1766 | vblwait->request.sequence) <= (1 << 23)) || |
8a51d5be | 1767 | !vblank->enabled || |
30b23634 | 1768 | !dev->irq_enabled)); |
1da177e4 | 1769 | |
30b23634 EA |
1770 | if (ret != -EINTR) { |
1771 | struct timeval now; | |
1da177e4 | 1772 | |
cc1ef118 | 1773 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, pipe, &now); |
30b23634 EA |
1774 | vblwait->reply.tval_sec = now.tv_sec; |
1775 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1776 | |
30b23634 EA |
1777 | DRM_DEBUG("returning %d to client\n", |
1778 | vblwait->reply.sequence); | |
1da177e4 | 1779 | } else { |
30b23634 | 1780 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1781 | } |
1782 | ||
0a3e67a4 | 1783 | done: |
cc1ef118 | 1784 | drm_vblank_put(dev, pipe); |
1da177e4 LT |
1785 | return ret; |
1786 | } | |
1787 | ||
cc1ef118 | 1788 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) |
c9a9c5e0 KH |
1789 | { |
1790 | struct drm_pending_vblank_event *e, *t; | |
1791 | struct timeval now; | |
c9a9c5e0 KH |
1792 | unsigned int seq; |
1793 | ||
56cc279b | 1794 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1795 | |
cc1ef118 | 1796 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c9a9c5e0 KH |
1797 | |
1798 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
cc1ef118 | 1799 | if (e->pipe != pipe) |
c9a9c5e0 KH |
1800 | continue; |
1801 | if ((seq - e->event.sequence) > (1<<23)) | |
1802 | continue; | |
1803 | ||
1804 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1805 | e->event.sequence, seq); | |
1806 | ||
c6eefa17 | 1807 | list_del(&e->base.link); |
cc1ef118 | 1808 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1809 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1810 | } |
1811 | ||
cc1ef118 | 1812 | trace_drm_vblank_event(pipe, seq); |
c9a9c5e0 KH |
1813 | } |
1814 | ||
0a3e67a4 JB |
1815 | /** |
1816 | * drm_handle_vblank - handle a vblank event | |
1817 | * @dev: DRM device | |
cc1ef118 | 1818 | * @pipe: index of CRTC where this event occurred |
0a3e67a4 JB |
1819 | * |
1820 | * Drivers should call this routine in their vblank interrupt handlers to | |
1821 | * update the vblank counter and send any signals that may be pending. | |
115ebcd4 TR |
1822 | * |
1823 | * This is the legacy version of drm_crtc_handle_vblank(). | |
0a3e67a4 | 1824 | */ |
cc1ef118 | 1825 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1826 | { |
cc1ef118 | 1827 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f MK |
1828 | unsigned long irqflags; |
1829 | ||
ee3c7795 | 1830 | if (WARN_ON_ONCE(!dev->num_crtcs)) |
78c6e170 | 1831 | return false; |
c9a9c5e0 | 1832 | |
cc1ef118 | 1833 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1834 | return false; |
1835 | ||
56cc279b VS |
1836 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1837 | ||
27641c3f MK |
1838 | /* Need timestamp lock to prevent concurrent execution with |
1839 | * vblank enable/disable, as this would cause inconsistent | |
1840 | * or corrupted timestamps and vblank counts. | |
1841 | */ | |
56cc279b | 1842 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1843 | |
1844 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1845 | if (!vblank->enabled) { |
56cc279b VS |
1846 | spin_unlock(&dev->vblank_time_lock); |
1847 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1848 | return false; |
27641c3f MK |
1849 | } |
1850 | ||
4dfd6486 | 1851 | drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ); |
27641c3f | 1852 | |
56cc279b VS |
1853 | spin_unlock(&dev->vblank_time_lock); |
1854 | ||
8a51d5be | 1855 | wake_up(&vblank->queue); |
cc1ef118 | 1856 | drm_handle_vblank_events(dev, pipe); |
27641c3f | 1857 | |
56cc279b VS |
1858 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1859 | ||
78c6e170 | 1860 | return true; |
0a3e67a4 JB |
1861 | } |
1862 | EXPORT_SYMBOL(drm_handle_vblank); | |
115ebcd4 TR |
1863 | |
1864 | /** | |
1865 | * drm_crtc_handle_vblank - handle a vblank event | |
1866 | * @crtc: where this event occurred | |
1867 | * | |
1868 | * Drivers should call this routine in their vblank interrupt handlers to | |
1869 | * update the vblank counter and send any signals that may be pending. | |
1870 | * | |
1871 | * This is the native KMS version of drm_handle_vblank(). | |
1872 | * | |
1873 | * Returns: | |
1874 | * True if the event was successfully handled, false on failure. | |
1875 | */ | |
1876 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1877 | { | |
1878 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1879 | } | |
1880 | EXPORT_SYMBOL(drm_crtc_handle_vblank); | |
b44f8408 VS |
1881 | |
1882 | /** | |
1883 | * drm_vblank_no_hw_counter - "No hw counter" implementation of .get_vblank_counter() | |
1884 | * @dev: DRM device | |
1885 | * @pipe: CRTC for which to read the counter | |
1886 | * | |
1887 | * Drivers can plug this into the .get_vblank_counter() function if | |
1888 | * there is no useable hardware frame counter available. | |
1889 | * | |
1890 | * Returns: | |
1891 | * 0 | |
1892 | */ | |
1893 | u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) | |
1894 | { | |
1895 | return 0; | |
1896 | } | |
1897 | EXPORT_SYMBOL(drm_vblank_no_hw_counter); |