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Commit | Line | Data |
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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); | |
d9d8c4cf DC |
76 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); |
77 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); | |
78 | MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps"); | |
18882995 | 79 | |
1da248a5 | 80 | static void store_vblank(struct drm_device *dev, unsigned int pipe, |
209e4dbc | 81 | u32 vblank_count_inc, |
4dfd6486 | 82 | struct timeval *t_vblank, u32 last) |
99264a61 | 83 | { |
1da248a5 | 84 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
99264a61 DV |
85 | u32 tslot; |
86 | ||
87 | assert_spin_locked(&dev->vblank_time_lock); | |
88 | ||
4dfd6486 VS |
89 | vblank->last = last; |
90 | ||
1b2eb710 VS |
91 | /* All writers hold the spinlock, but readers are serialized by |
92 | * the latching of vblank->count below. | |
93 | */ | |
94 | tslot = vblank->count + vblank_count_inc; | |
95 | vblanktimestamp(dev, pipe, tslot) = *t_vblank; | |
99264a61 DV |
96 | |
97 | /* | |
98 | * vblank timestamp updates are protected on the write side with | |
99 | * vblank_time_lock, but on the read side done locklessly using a | |
100 | * sequence-lock on the vblank counter. Ensure correct ordering using | |
101 | * memory barrriers. We need the barrier both before and also after the | |
102 | * counter update to synchronize with the next timestamp write. | |
103 | * The read-side barriers for this are in drm_vblank_count_and_time. | |
104 | */ | |
105 | smp_wmb(); | |
106 | vblank->count += vblank_count_inc; | |
107 | smp_wmb(); | |
108 | } | |
109 | ||
4dfd6486 VS |
110 | /** |
111 | * drm_reset_vblank_timestamp - reset the last timestamp to the last vblank | |
112 | * @dev: DRM device | |
113 | * @pipe: index of CRTC for which to reset the timestamp | |
114 | * | |
115 | * Reset the stored timestamp for the current vblank count to correspond | |
116 | * to the last vblank occurred. | |
117 | * | |
118 | * Only to be called from drm_vblank_on(). | |
119 | * | |
120 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
121 | * device vblank fields. | |
122 | */ | |
123 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) | |
124 | { | |
125 | u32 cur_vblank; | |
126 | bool rc; | |
127 | struct timeval t_vblank; | |
128 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
129 | ||
130 | spin_lock(&dev->vblank_time_lock); | |
131 | ||
132 | /* | |
133 | * sample the current counter to avoid random jumps | |
134 | * when drm_vblank_enable() applies the diff | |
135 | */ | |
136 | do { | |
137 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); | |
138 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0); | |
139 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0); | |
140 | ||
141 | /* | |
142 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
143 | * available and didn't fail. Otherwise reinitialize delayed at next vblank | |
144 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
145 | */ | |
146 | if (!rc) | |
147 | t_vblank = (struct timeval) {0, 0}; | |
148 | ||
149 | /* | |
150 | * +1 to make sure user will never see the same | |
151 | * vblank counter value before and after a modeset | |
152 | */ | |
153 | store_vblank(dev, pipe, 1, &t_vblank, cur_vblank); | |
154 | ||
155 | spin_unlock(&dev->vblank_time_lock); | |
156 | } | |
157 | ||
13b030af VS |
158 | /** |
159 | * drm_update_vblank_count - update the master vblank counter | |
160 | * @dev: DRM device | |
cc1ef118 | 161 | * @pipe: counter to update |
13b030af VS |
162 | * |
163 | * Call back into the driver to update the appropriate vblank counter | |
1da248a5 | 164 | * (specified by @pipe). Deal with wraparound, if it occurred, and |
13b030af VS |
165 | * update the last read value so we can deal with wraparound on the next |
166 | * call if necessary. | |
167 | * | |
168 | * Only necessary when going from off->on, to account for frames we | |
169 | * didn't get an interrupt for. | |
170 | * | |
171 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
172 | * device vblank fields. | |
173 | */ | |
a6e610dc VS |
174 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, |
175 | unsigned long flags) | |
13b030af | 176 | { |
cc1ef118 | 177 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
99264a61 | 178 | u32 cur_vblank, diff; |
fb446a1a | 179 | bool rc; |
13b030af | 180 | struct timeval t_vblank; |
facfb062 | 181 | int count = DRM_TIMESTAMP_MAXRETRIES; |
4dfd6486 | 182 | int framedur_ns = vblank->framedur_ns; |
13b030af VS |
183 | |
184 | /* | |
185 | * Interrupts were disabled prior to this call, so deal with counter | |
186 | * wrap if needed. | |
5ceecb2f | 187 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events |
13b030af VS |
188 | * here if the register is small or we had vblank interrupts off for |
189 | * a long time. | |
190 | * | |
191 | * We repeat the hardware vblank counter & timestamp query until | |
192 | * we get consistent results. This to prevent races between gpu | |
193 | * updating its hardware counter while we are retrieving the | |
194 | * corresponding vblank timestamp. | |
195 | */ | |
196 | do { | |
cc1ef118 | 197 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); |
a6e610dc | 198 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags); |
facfb062 | 199 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0); |
13b030af | 200 | |
4dfd6486 VS |
201 | if (dev->max_vblank_count != 0) { |
202 | /* trust the hw counter when it's around */ | |
203 | diff = (cur_vblank - vblank->last) & dev->max_vblank_count; | |
204 | } else if (rc && framedur_ns) { | |
205 | const struct timeval *t_old; | |
206 | u64 diff_ns; | |
207 | ||
208 | t_old = &vblanktimestamp(dev, pipe, vblank->count); | |
209 | diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old); | |
13b030af | 210 | |
4dfd6486 VS |
211 | /* |
212 | * Figure out how many vblanks we've missed based | |
213 | * on the difference in the timestamps and the | |
214 | * frame/field duration. | |
215 | */ | |
216 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |
217 | ||
218 | if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ) | |
235fabe0 VS |
219 | DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored." |
220 | " diff_ns = %lld, framedur_ns = %d)\n", | |
221 | pipe, (long long) diff_ns, framedur_ns); | |
4dfd6486 VS |
222 | } else { |
223 | /* some kind of default for drivers w/o accurate vbl timestamping */ | |
224 | diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0; | |
13b030af VS |
225 | } |
226 | ||
c61934ed MK |
227 | /* |
228 | * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset | |
229 | * interval? If so then vblank irqs keep running and it will likely | |
230 | * happen that the hardware vblank counter is not trustworthy as it | |
231 | * might reset at some point in that interval and vblank timestamps | |
232 | * are not trustworthy either in that interval. Iow. this can result | |
233 | * in a bogus diff >> 1 which must be avoided as it would cause | |
234 | * random large forward jumps of the software vblank counter. | |
235 | */ | |
236 | if (diff > 1 && (vblank->inmodeset & 0x2)) { | |
237 | DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u" | |
238 | " due to pre-modeset.\n", pipe, diff); | |
239 | diff = 1; | |
240 | } | |
241 | ||
99b8e715 MK |
242 | /* |
243 | * FIMXE: Need to replace this hack with proper seqlocks. | |
244 | * | |
245 | * Restrict the bump of the software vblank counter to a safe maximum | |
246 | * value of +1 whenever there is the possibility that concurrent readers | |
247 | * of vblank timestamps could be active at the moment, as the current | |
248 | * implementation of the timestamp caching and updating is not safe | |
249 | * against concurrent readers for calls to store_vblank() with a bump | |
250 | * of anything but +1. A bump != 1 would very likely return corrupted | |
251 | * timestamps to userspace, because the same slot in the cache could | |
252 | * be concurrently written by store_vblank() and read by one of those | |
253 | * readers without the read-retry logic detecting the collision. | |
254 | * | |
255 | * Concurrent readers can exist when we are called from the | |
256 | * drm_vblank_off() or drm_vblank_on() functions and other non-vblank- | |
257 | * irq callers. However, all those calls to us are happening with the | |
258 | * vbl_lock locked to prevent drm_vblank_get(), so the vblank refcount | |
259 | * can't increase while we are executing. Therefore a zero refcount at | |
260 | * this point is safe for arbitrary counter bumps if we are called | |
261 | * outside vblank irq, a non-zero count is not 100% safe. Unfortunately | |
262 | * we must also accept a refcount of 1, as whenever we are called from | |
263 | * drm_vblank_get() -> drm_vblank_enable() the refcount will be 1 and | |
264 | * we must let that one pass through in order to not lose vblank counts | |
265 | * during vblank irq off - which would completely defeat the whole | |
266 | * point of this routine. | |
267 | * | |
268 | * Whenever we are called from vblank irq, we have to assume concurrent | |
269 | * readers exist or can show up any time during our execution, even if | |
270 | * the refcount is currently zero, as vblank irqs are usually only | |
271 | * enabled due to the presence of readers, and because when we are called | |
272 | * from vblank irq we can't hold the vbl_lock to protect us from sudden | |
273 | * bumps in vblank refcount. Therefore also restrict bumps to +1 when | |
274 | * called from vblank irq. | |
275 | */ | |
276 | if ((diff > 1) && (atomic_read(&vblank->refcount) > 1 || | |
277 | (flags & DRM_CALLED_FROM_VBLIRQ))) { | |
278 | DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u " | |
279 | "refcount %u, vblirq %u\n", pipe, diff, | |
280 | atomic_read(&vblank->refcount), | |
281 | (flags & DRM_CALLED_FROM_VBLIRQ) != 0); | |
282 | diff = 1; | |
283 | } | |
284 | ||
235fabe0 VS |
285 | DRM_DEBUG_VBL("updating vblank count on crtc %u:" |
286 | " current=%u, diff=%u, hw=%u hw_last=%u\n", | |
287 | pipe, vblank->count, diff, cur_vblank, vblank->last); | |
13b030af | 288 | |
4dfd6486 VS |
289 | if (diff == 0) { |
290 | WARN_ON_ONCE(cur_vblank != vblank->last); | |
da8f4396 | 291 | return; |
4dfd6486 | 292 | } |
da8f4396 | 293 | |
99264a61 DV |
294 | /* |
295 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
fa4270d8 VS |
296 | * available and didn't fail, or we were called from the vblank interrupt. |
297 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 | |
298 | * for now, to mark the vblanktimestamp as invalid. | |
13b030af | 299 | */ |
fa4270d8 | 300 | if (!rc && (flags & DRM_CALLED_FROM_VBLIRQ) == 0) |
d66a1e38 MK |
301 | t_vblank = (struct timeval) {0, 0}; |
302 | ||
4dfd6486 | 303 | store_vblank(dev, pipe, diff, &t_vblank, cur_vblank); |
13b030af VS |
304 | } |
305 | ||
27641c3f MK |
306 | /* |
307 | * Disable vblank irq's on crtc, make sure that last vblank count | |
308 | * of hardware and corresponding consistent software vblank counter | |
309 | * are preserved, even if there are any spurious vblank irq's after | |
310 | * disable. | |
311 | */ | |
cc1ef118 | 312 | static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) |
27641c3f | 313 | { |
cc1ef118 | 314 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f | 315 | unsigned long irqflags; |
27641c3f MK |
316 | |
317 | /* Prevent vblank irq processing while disabling vblank irqs, | |
318 | * so no updates of timestamps or count can happen after we've | |
319 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 320 | */ |
27641c3f MK |
321 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
322 | ||
eb2ed66f LP |
323 | /* |
324 | * Only disable vblank interrupts if they're enabled. This avoids | |
325 | * calling the ->disable_vblank() operation in atomic context with the | |
326 | * hardware potentially runtime suspended. | |
327 | */ | |
328 | if (vblank->enabled) { | |
cc1ef118 | 329 | dev->driver->disable_vblank(dev, pipe); |
eb2ed66f LP |
330 | vblank->enabled = false; |
331 | } | |
27641c3f | 332 | |
4dfd6486 VS |
333 | /* |
334 | * Always update the count and timestamp to maintain the | |
335 | * appearance that the counter has been ticking all along until | |
336 | * this time. This makes the count account for the entire time | |
337 | * between drm_vblank_on() and drm_vblank_off(). | |
27641c3f | 338 | */ |
4dfd6486 | 339 | drm_update_vblank_count(dev, pipe, 0); |
27641c3f | 340 | |
27641c3f | 341 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
342 | } |
343 | ||
0a3e67a4 JB |
344 | static void vblank_disable_fn(unsigned long arg) |
345 | { | |
e69595c2 VS |
346 | struct drm_vblank_crtc *vblank = (void *)arg; |
347 | struct drm_device *dev = vblank->dev; | |
cc1ef118 | 348 | unsigned int pipe = vblank->pipe; |
0a3e67a4 | 349 | unsigned long irqflags; |
0a3e67a4 | 350 | |
e69595c2 VS |
351 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
352 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
cc1ef118 TR |
353 | DRM_DEBUG("disabling vblank on crtc %u\n", pipe); |
354 | vblank_disable_and_save(dev, pipe); | |
0a3e67a4 | 355 | } |
e69595c2 | 356 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
357 | } |
358 | ||
f5752b38 DV |
359 | /** |
360 | * drm_vblank_cleanup - cleanup vblank support | |
361 | * @dev: DRM device | |
362 | * | |
363 | * This function cleans up any resources allocated in drm_vblank_init. | |
364 | */ | |
52440211 | 365 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 366 | { |
cc1ef118 | 367 | unsigned int pipe; |
e69595c2 | 368 | |
0a3e67a4 JB |
369 | /* Bail if the driver didn't call drm_vblank_init() */ |
370 | if (dev->num_crtcs == 0) | |
371 | return; | |
372 | ||
cc1ef118 TR |
373 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { |
374 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
8a51d5be | 375 | |
3bff93d6 DV |
376 | WARN_ON(vblank->enabled && |
377 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
2368ffb1 | 378 | |
3bff93d6 | 379 | del_timer_sync(&vblank->disable_timer); |
e69595c2 | 380 | } |
0a3e67a4 | 381 | |
5380e929 | 382 | kfree(dev->vblank); |
0a3e67a4 JB |
383 | |
384 | dev->num_crtcs = 0; | |
385 | } | |
e77cef9c | 386 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 387 | |
f5752b38 DV |
388 | /** |
389 | * drm_vblank_init - initialize vblank support | |
cc1ef118 TR |
390 | * @dev: DRM device |
391 | * @num_crtcs: number of CRTCs supported by @dev | |
f5752b38 DV |
392 | * |
393 | * This function initializes vblank support for @num_crtcs display pipelines. | |
394 | * | |
395 | * Returns: | |
396 | * Zero on success or a negative error code on failure. | |
397 | */ | |
cc1ef118 | 398 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) |
0a3e67a4 | 399 | { |
cc1ef118 TR |
400 | int ret = -ENOMEM; |
401 | unsigned int i; | |
0a3e67a4 | 402 | |
0a3e67a4 | 403 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
404 | spin_lock_init(&dev->vblank_time_lock); |
405 | ||
0a3e67a4 JB |
406 | dev->num_crtcs = num_crtcs; |
407 | ||
5380e929 VS |
408 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
409 | if (!dev->vblank) | |
0a3e67a4 JB |
410 | goto err; |
411 | ||
e69595c2 | 412 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
413 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
414 | ||
415 | vblank->dev = dev; | |
cc1ef118 | 416 | vblank->pipe = i; |
8a51d5be VS |
417 | init_waitqueue_head(&vblank->queue); |
418 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
419 | (unsigned long)vblank); | |
e69595c2 | 420 | } |
27641c3f | 421 | |
8f6fce03 | 422 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
423 | |
424 | /* Driver specific high-precision vblank timestamping supported? */ | |
425 | if (dev->driver->get_vblank_timestamp) | |
426 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
427 | else | |
428 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
429 | ||
5a8b21b2 MK |
430 | /* Must have precise timestamping for reliable vblank instant disable */ |
431 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
432 | dev->vblank_disable_immediate = false; | |
433 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
434 | "get_vblank_timestamp == NULL\n"); | |
435 | } | |
436 | ||
0a3e67a4 JB |
437 | return 0; |
438 | ||
439 | err: | |
79a093ae | 440 | dev->num_crtcs = 0; |
0a3e67a4 JB |
441 | return ret; |
442 | } | |
443 | EXPORT_SYMBOL(drm_vblank_init); | |
444 | ||
28d52043 DA |
445 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
446 | { | |
447 | struct drm_device *dev = cookie; | |
448 | ||
449 | if (dev->driver->vgaarb_irq) { | |
450 | dev->driver->vgaarb_irq(dev, state); | |
451 | return; | |
452 | } | |
453 | ||
454 | if (!dev->irq_enabled) | |
455 | return; | |
456 | ||
5037f8ac JS |
457 | if (state) { |
458 | if (dev->driver->irq_uninstall) | |
459 | dev->driver->irq_uninstall(dev); | |
460 | } else { | |
461 | if (dev->driver->irq_preinstall) | |
462 | dev->driver->irq_preinstall(dev); | |
463 | if (dev->driver->irq_postinstall) | |
464 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
465 | } |
466 | } | |
467 | ||
1da177e4 | 468 | /** |
f5752b38 DV |
469 | * drm_irq_install - install IRQ handler |
470 | * @dev: DRM device | |
471 | * @irq: IRQ number to install the handler for | |
1da177e4 | 472 | * |
0a3e67a4 | 473 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
474 | * irq_preinstall() and irq_postinstall() functions before and after the |
475 | * installation. | |
476 | * | |
477 | * This is the simplified helper interface provided for drivers with no special | |
478 | * needs. Drivers which need to install interrupt handlers for multiple | |
479 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
480 | * that vblank interrupts are available. | |
481 | * | |
482 | * Returns: | |
483 | * Zero on success or a negative error code on failure. | |
1da177e4 | 484 | */ |
bb0f1b5c | 485 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 486 | { |
4a1b0714 | 487 | int ret; |
b5e89ed5 | 488 | unsigned long sh_flags = 0; |
1da177e4 LT |
489 | |
490 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
491 | return -EINVAL; | |
492 | ||
7c1a38e3 | 493 | if (irq == 0) |
1da177e4 LT |
494 | return -EINVAL; |
495 | ||
1da177e4 | 496 | /* Driver must have been initialized */ |
e090c53b | 497 | if (!dev->dev_private) |
1da177e4 | 498 | return -EINVAL; |
1da177e4 | 499 | |
e090c53b | 500 | if (dev->irq_enabled) |
1da177e4 | 501 | return -EBUSY; |
4423843c | 502 | dev->irq_enabled = true; |
1da177e4 | 503 | |
7c1a38e3 | 504 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 505 | |
b5e89ed5 | 506 | /* Before installing handler */ |
5037f8ac JS |
507 | if (dev->driver->irq_preinstall) |
508 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 509 | |
b5e89ed5 | 510 | /* Install handler */ |
1da177e4 | 511 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 512 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 513 | |
7c1a38e3 | 514 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 515 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 516 | |
b5e89ed5 | 517 | if (ret < 0) { |
4423843c | 518 | dev->irq_enabled = false; |
1da177e4 LT |
519 | return ret; |
520 | } | |
521 | ||
28d52043 DA |
522 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
523 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
524 | ||
b5e89ed5 | 525 | /* After installing handler */ |
5037f8ac JS |
526 | if (dev->driver->irq_postinstall) |
527 | ret = dev->driver->irq_postinstall(dev); | |
528 | ||
0a3e67a4 | 529 | if (ret < 0) { |
4423843c | 530 | dev->irq_enabled = false; |
e1c44acc JS |
531 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
532 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
7c1a38e3 DV |
533 | free_irq(irq, dev); |
534 | } else { | |
535 | dev->irq = irq; | |
0a3e67a4 | 536 | } |
1da177e4 | 537 | |
0a3e67a4 | 538 | return ret; |
1da177e4 | 539 | } |
0a3e67a4 | 540 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
541 | |
542 | /** | |
f5752b38 DV |
543 | * drm_irq_uninstall - uninstall the IRQ handler |
544 | * @dev: DRM device | |
545 | * | |
546 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
547 | * This should only be called by drivers which used drm_irq_install() to set up | |
548 | * their interrupt handler. Other drivers must only reset | |
549 | * drm_device->irq_enabled to false. | |
1da177e4 | 550 | * |
f5752b38 DV |
551 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
552 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
553 | * the same function through an ioctl. | |
1da177e4 | 554 | * |
f5752b38 DV |
555 | * Returns: |
556 | * Zero on success or a negative error code on failure. | |
1da177e4 | 557 | */ |
27641c3f | 558 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 559 | { |
dc1336ff | 560 | unsigned long irqflags; |
4423843c VS |
561 | bool irq_enabled; |
562 | int i; | |
1da177e4 LT |
563 | |
564 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
565 | return -EINVAL; | |
566 | ||
1da177e4 | 567 | irq_enabled = dev->irq_enabled; |
4423843c | 568 | dev->irq_enabled = false; |
1da177e4 | 569 | |
dc1336ff | 570 | /* |
3bff93d6 DV |
571 | * Wake up any waiters so they don't hang. This is just to paper over |
572 | * isssues for UMS drivers which aren't in full control of their | |
573 | * vblank/irq handling. KMS drivers must ensure that vblanks are all | |
574 | * disabled when uninstalling the irq handler. | |
dc1336ff | 575 | */ |
bde4889a BS |
576 | if (dev->num_crtcs) { |
577 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
578 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
579 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
580 | ||
3bff93d6 DV |
581 | if (!vblank->enabled) |
582 | continue; | |
583 | ||
584 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
585 | ||
586 | vblank_disable_and_save(dev, i); | |
8a51d5be | 587 | wake_up(&vblank->queue); |
bde4889a BS |
588 | } |
589 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 590 | } |
dc1336ff | 591 | |
b5e89ed5 | 592 | if (!irq_enabled) |
1da177e4 LT |
593 | return -EINVAL; |
594 | ||
7c1a38e3 | 595 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 596 | |
28d52043 DA |
597 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
598 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
599 | ||
5037f8ac JS |
600 | if (dev->driver->irq_uninstall) |
601 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 602 | |
7c1a38e3 | 603 | free_irq(dev->irq, dev); |
1da177e4 LT |
604 | |
605 | return 0; | |
606 | } | |
607 | EXPORT_SYMBOL(drm_irq_uninstall); | |
608 | ||
f5752b38 | 609 | /* |
1da177e4 LT |
610 | * IRQ control ioctl. |
611 | * | |
612 | * \param inode device inode. | |
6c340eac | 613 | * \param file_priv DRM file private. |
1da177e4 LT |
614 | * \param cmd command. |
615 | * \param arg user argument, pointing to a drm_control structure. | |
616 | * \return zero on success or a negative number on failure. | |
617 | * | |
618 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
619 | */ | |
c153f45f EA |
620 | int drm_control(struct drm_device *dev, void *data, |
621 | struct drm_file *file_priv) | |
1da177e4 | 622 | { |
c153f45f | 623 | struct drm_control *ctl = data; |
a319c1a4 | 624 | int ret = 0, irq; |
b5e89ed5 | 625 | |
27641c3f MK |
626 | /* if we haven't irq we fallback for compatibility reasons - |
627 | * this used to be a separate function in drm_dma.h | |
628 | */ | |
1da177e4 | 629 | |
22471cf6 DV |
630 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
631 | return 0; | |
632 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
633 | return 0; | |
634 | /* UMS was only ever support on pci devices. */ | |
635 | if (WARN_ON(!dev->pdev)) | |
636 | return -EINVAL; | |
1da177e4 | 637 | |
c153f45f | 638 | switch (ctl->func) { |
1da177e4 | 639 | case DRM_INST_HANDLER: |
a319c1a4 DV |
640 | irq = dev->pdev->irq; |
641 | ||
1da177e4 | 642 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 643 | ctl->irq != irq) |
1da177e4 | 644 | return -EINVAL; |
e090c53b | 645 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 646 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
647 | mutex_unlock(&dev->struct_mutex); |
648 | ||
649 | return ret; | |
1da177e4 | 650 | case DRM_UNINST_HANDLER: |
e090c53b DV |
651 | mutex_lock(&dev->struct_mutex); |
652 | ret = drm_irq_uninstall(dev); | |
653 | mutex_unlock(&dev->struct_mutex); | |
654 | ||
655 | return ret; | |
1da177e4 LT |
656 | default: |
657 | return -EINVAL; | |
658 | } | |
659 | } | |
660 | ||
27641c3f | 661 | /** |
f5752b38 DV |
662 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
663 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
664 | * @mode: display mode containing the scanout timings | |
27641c3f | 665 | * |
21b21560 VS |
666 | * Calculate and store various constants which are later |
667 | * needed by vblank and swap-completion timestamping, e.g, | |
668 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 669 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 670 | * things like panel scaling or other adjustments into account. |
27641c3f | 671 | */ |
545cdd55 VS |
672 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
673 | const struct drm_display_mode *mode) | |
27641c3f | 674 | { |
0c545ac4 VS |
675 | struct drm_device *dev = crtc->dev; |
676 | unsigned int pipe = drm_crtc_index(crtc); | |
677 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
20b20203 | 678 | int linedur_ns = 0, framedur_ns = 0; |
77666b72 | 679 | int dotclock = mode->crtc_clock; |
27641c3f | 680 | |
0c545ac4 VS |
681 | if (!dev->num_crtcs) |
682 | return; | |
683 | ||
684 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
685 | return; | |
686 | ||
27641c3f MK |
687 | /* Valid dotclock? */ |
688 | if (dotclock > 0) { | |
0dae35a3 VS |
689 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
690 | ||
691 | /* | |
692 | * Convert scanline length in pixels and video | |
20b20203 VS |
693 | * dot clock to line duration and frame duration |
694 | * in nanoseconds: | |
27641c3f | 695 | */ |
0dae35a3 VS |
696 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); |
697 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
698 | |
699 | /* | |
700 | * Fields of interlaced scanout modes are only half a frame duration. | |
701 | */ | |
702 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
703 | framedur_ns /= 2; | |
27641c3f | 704 | } else |
cc1ef118 | 705 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", |
27641c3f MK |
706 | crtc->base.id); |
707 | ||
eba1f35d VS |
708 | vblank->linedur_ns = linedur_ns; |
709 | vblank->framedur_ns = framedur_ns; | |
27641c3f | 710 | |
cc1ef118 | 711 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", |
545cdd55 VS |
712 | crtc->base.id, mode->crtc_htotal, |
713 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
20b20203 VS |
714 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n", |
715 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
27641c3f MK |
716 | } |
717 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
718 | ||
719 | /** | |
f5752b38 DV |
720 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
721 | * @dev: DRM device | |
cc1ef118 | 722 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
f5752b38 DV |
723 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
724 | * On return contains true maximum error of timestamp | |
725 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
726 | * @flags: Flags to pass to driver: | |
727 | * 0 = Default, | |
728 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
f5752b38 DV |
729 | * @mode: mode which defines the scanout timings |
730 | * | |
731 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
732 | * timings and current video scanout position of a CRTC. This can be called from | |
733 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
734 | * actual timestamping. | |
27641c3f MK |
735 | * |
736 | * Should return timestamps conforming to the OML_sync_control OpenML | |
737 | * extension specification. The timestamp corresponds to the end of | |
738 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
739 | * pixel in the following video frame. | |
740 | * | |
741 | * Requires support for optional dev->driver->get_scanout_position() | |
742 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
743 | * that corresponds to the true scanout timing. | |
744 | * | |
745 | * The current implementation only handles standard video modes. It | |
746 | * returns as no operation if a doublescan or interlaced video mode is | |
747 | * active. Higher level code is expected to handle this. | |
748 | * | |
f5752b38 DV |
749 | * Returns: |
750 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
751 | * video mode: |
752 | * | |
f5752b38 | 753 | * -EINVAL - Invalid CRTC. |
27641c3f MK |
754 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
755 | * -ENOTSUPP - Function not supported in current display mode. | |
756 | * -EIO - Failed, e.g., due to failed scanout position query. | |
757 | * | |
758 | * Returns or'ed positive status flags on success: | |
759 | * | |
760 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
761 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
762 | * | |
763 | */ | |
cc1ef118 TR |
764 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, |
765 | unsigned int pipe, | |
27641c3f MK |
766 | int *max_error, |
767 | struct timeval *vblank_time, | |
768 | unsigned flags, | |
7da903ef | 769 | const struct drm_display_mode *mode) |
27641c3f | 770 | { |
e62f2f5a | 771 | struct timeval tv_etime; |
d2cb58c8 | 772 | ktime_t stime, etime; |
ad1716ec VS |
773 | unsigned int vbl_status; |
774 | int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
27641c3f | 775 | int vpos, hpos, i; |
3bb403bf | 776 | int delta_ns, duration_ns; |
27641c3f | 777 | |
cc1ef118 TR |
778 | if (pipe >= dev->num_crtcs) { |
779 | DRM_ERROR("Invalid crtc %u\n", pipe); | |
27641c3f MK |
780 | return -EINVAL; |
781 | } | |
782 | ||
783 | /* Scanout position query not supported? Should not happen. */ | |
784 | if (!dev->driver->get_scanout_position) { | |
785 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
786 | return -EIO; | |
787 | } | |
788 | ||
27641c3f MK |
789 | /* If mode timing undefined, just return as no-op: |
790 | * Happens during initial modesetting of a crtc. | |
791 | */ | |
3bb403bf | 792 | if (mode->crtc_clock == 0) { |
cc1ef118 | 793 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); |
27641c3f MK |
794 | return -EAGAIN; |
795 | } | |
796 | ||
27641c3f MK |
797 | /* Get current scanout position with system timestamp. |
798 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
799 | * if single query takes longer than max_error nanoseconds. | |
800 | * | |
801 | * This guarantees a tight bound on maximum error if | |
802 | * code gets preempted or delayed for some reason. | |
803 | */ | |
804 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
805 | /* |
806 | * Get vertical and horizontal scanout position vpos, hpos, | |
807 | * and bounding timestamps stime, etime, pre/post query. | |
808 | */ | |
3bb403bf VS |
809 | vbl_status = dev->driver->get_scanout_position(dev, pipe, flags, |
810 | &vpos, &hpos, | |
811 | &stime, &etime, | |
812 | mode); | |
27641c3f | 813 | |
27641c3f MK |
814 | /* Return as no-op if scanout query unsupported or failed. */ |
815 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
ad1716ec | 816 | DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n", |
cc1ef118 | 817 | pipe, vbl_status); |
27641c3f MK |
818 | return -EIO; |
819 | } | |
820 | ||
8f6fce03 | 821 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 822 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
823 | |
824 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 825 | if (duration_ns <= *max_error) |
27641c3f MK |
826 | break; |
827 | } | |
828 | ||
829 | /* Noisy system timing? */ | |
830 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
cc1ef118 TR |
831 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", |
832 | pipe, duration_ns/1000, *max_error/1000, i); | |
27641c3f MK |
833 | } |
834 | ||
835 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 836 | *max_error = duration_ns; |
27641c3f MK |
837 | |
838 | /* Check if in vblank area: | |
839 | * vpos is >=0 in video scanout area, but negative | |
840 | * within vblank area, counting down the number of lines until | |
841 | * start of scanout. | |
842 | */ | |
ad1716ec VS |
843 | if (vbl_status & DRM_SCANOUTPOS_IN_VBLANK) |
844 | ret |= DRM_VBLANKTIME_IN_VBLANK; | |
27641c3f MK |
845 | |
846 | /* Convert scanout position into elapsed time at raw_time query | |
847 | * since start of scanout at first display scanline. delta_ns | |
848 | * can be negative if start of scanout hasn't happened yet. | |
849 | */ | |
3bb403bf VS |
850 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), |
851 | mode->crtc_clock); | |
27641c3f | 852 | |
c61eef72 | 853 | if (!drm_timestamp_monotonic) |
d2cb58c8 | 854 | etime = ktime_mono_to_real(etime); |
c61eef72 | 855 | |
e62f2f5a ID |
856 | /* save this only for debugging purposes */ |
857 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
858 | /* Subtract time delta from raw timestamp to get final |
859 | * vblank_time timestamp for end of vblank. | |
860 | */ | |
a91d7b91 | 861 | etime = ktime_sub_ns(etime, delta_ns); |
e62f2f5a | 862 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 863 | |
235fabe0 VS |
864 | DRM_DEBUG_VBL("crtc %u : v 0x%x p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
865 | pipe, vbl_status, hpos, vpos, | |
866 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, | |
867 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, | |
868 | duration_ns/1000, i); | |
27641c3f | 869 | |
ad1716ec | 870 | return ret; |
27641c3f MK |
871 | } |
872 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
873 | ||
c61eef72 ID |
874 | static struct timeval get_drm_timestamp(void) |
875 | { | |
876 | ktime_t now; | |
877 | ||
d2cb58c8 | 878 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
c61eef72 ID |
879 | return ktime_to_timeval(now); |
880 | } | |
881 | ||
27641c3f MK |
882 | /** |
883 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
4dfd909f | 884 | * vblank interval |
27641c3f | 885 | * @dev: DRM device |
cc1ef118 | 886 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
27641c3f MK |
887 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
888 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
889 | * 0 = Default, |
890 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
891 | * |
892 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 893 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
894 | * compute the timestamp with a high-precision GPU specific method. |
895 | * | |
896 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
897 | * call, i.e., it isn't very precisely locked to the true vblank. | |
898 | * | |
f5752b38 | 899 | * Returns: |
fb446a1a | 900 | * True if timestamp is considered to be very precise, false otherwise. |
27641c3f | 901 | */ |
fb446a1a | 902 | static bool |
cc1ef118 | 903 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
fb446a1a | 904 | struct timeval *tvblank, unsigned flags) |
27641c3f | 905 | { |
4a1b0714 | 906 | int ret; |
27641c3f MK |
907 | |
908 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
909 | int max_error = (int) drm_timestamp_precision * 1000; | |
910 | ||
911 | /* Query driver if possible and precision timestamping enabled. */ | |
912 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
cc1ef118 | 913 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, |
27641c3f MK |
914 | tvblank, flags); |
915 | if (ret > 0) | |
fb446a1a | 916 | return true; |
27641c3f MK |
917 | } |
918 | ||
919 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 920 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 921 | */ |
c61eef72 | 922 | *tvblank = get_drm_timestamp(); |
27641c3f | 923 | |
fb446a1a | 924 | return false; |
27641c3f | 925 | } |
27641c3f | 926 | |
0a3e67a4 JB |
927 | /** |
928 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
929 | * @dev: DRM device | |
cc1ef118 | 930 | * @pipe: index of CRTC for which to retrieve the counter |
0a3e67a4 JB |
931 | * |
932 | * Fetches the "cooked" vblank count value that represents the number of | |
933 | * vblank events since the system was booted, including lost events due to | |
934 | * modesetting activity. | |
f5752b38 | 935 | * |
96d3f91e TR |
936 | * This is the legacy version of drm_crtc_vblank_count(). |
937 | * | |
f5752b38 DV |
938 | * Returns: |
939 | * The software vblank counter. | |
0a3e67a4 | 940 | */ |
88e72717 | 941 | u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 942 | { |
cc1ef118 | 943 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 944 | |
cc1ef118 | 945 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 | 946 | return 0; |
7d1de851 | 947 | |
99264a61 | 948 | return vblank->count; |
0a3e67a4 JB |
949 | } |
950 | EXPORT_SYMBOL(drm_vblank_count); | |
951 | ||
96d3f91e TR |
952 | /** |
953 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
954 | * @crtc: which counter to retrieve | |
955 | * | |
956 | * Fetches the "cooked" vblank count value that represents the number of | |
957 | * vblank events since the system was booted, including lost events due to | |
958 | * modesetting activity. | |
959 | * | |
960 | * This is the native KMS version of drm_vblank_count(). | |
961 | * | |
962 | * Returns: | |
963 | * The software vblank counter. | |
964 | */ | |
965 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) | |
966 | { | |
967 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
968 | } | |
969 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
970 | ||
27641c3f | 971 | /** |
cc1ef118 TR |
972 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the |
973 | * system timestamp corresponding to that vblank counter value. | |
27641c3f | 974 | * @dev: DRM device |
cc1ef118 | 975 | * @pipe: index of CRTC whose counter to retrieve |
27641c3f MK |
976 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. |
977 | * | |
978 | * Fetches the "cooked" vblank count value that represents the number of | |
979 | * vblank events since the system was booted, including lost events due to | |
980 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 981 | * of the vblank interval that corresponds to the current vblank counter value. |
cf648305 TR |
982 | * |
983 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
27641c3f | 984 | */ |
cc1ef118 | 985 | u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, |
27641c3f MK |
986 | struct timeval *vblanktime) |
987 | { | |
cc1ef118 | 988 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
facfb062 | 989 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
990 | u32 cur_vblank; |
991 | ||
cc1ef118 | 992 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
993 | return 0; |
994 | ||
99264a61 DV |
995 | /* |
996 | * Vblank timestamps are read lockless. To ensure consistency the vblank | |
997 | * counter is rechecked and ordering is ensured using memory barriers. | |
998 | * This works like a seqlock. The write-side barriers are in store_vblank. | |
27641c3f MK |
999 | */ |
1000 | do { | |
99264a61 DV |
1001 | cur_vblank = vblank->count; |
1002 | smp_rmb(); | |
cc1ef118 | 1003 | *vblanktime = vblanktimestamp(dev, pipe, cur_vblank); |
27641c3f | 1004 | smp_rmb(); |
facfb062 | 1005 | } while (cur_vblank != vblank->count && --count > 0); |
27641c3f MK |
1006 | |
1007 | return cur_vblank; | |
1008 | } | |
1009 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
1010 | ||
cf648305 TR |
1011 | /** |
1012 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
1013 | * and the system timestamp corresponding to that vblank counter value | |
1014 | * @crtc: which counter to retrieve | |
1015 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
1016 | * | |
1017 | * Fetches the "cooked" vblank count value that represents the number of | |
1018 | * vblank events since the system was booted, including lost events due to | |
1019 | * modesetting activity. Returns corresponding system timestamp of the time | |
1020 | * of the vblank interval that corresponds to the current vblank counter value. | |
1021 | * | |
1022 | * This is the native KMS version of drm_vblank_count_and_time(). | |
1023 | */ | |
1024 | u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, | |
1025 | struct timeval *vblanktime) | |
1026 | { | |
1027 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
1028 | vblanktime); | |
1029 | } | |
1030 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
1031 | ||
c6eefa17 RC |
1032 | static void send_vblank_event(struct drm_device *dev, |
1033 | struct drm_pending_vblank_event *e, | |
1034 | unsigned long seq, struct timeval *now) | |
1035 | { | |
c6eefa17 RC |
1036 | e->event.sequence = seq; |
1037 | e->event.tv_sec = now->tv_sec; | |
1038 | e->event.tv_usec = now->tv_usec; | |
1039 | ||
fb740cf2 DV |
1040 | drm_send_event_locked(dev, &e->base); |
1041 | ||
c6eefa17 RC |
1042 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, |
1043 | e->event.sequence); | |
1044 | } | |
1045 | ||
bbc8764f DV |
1046 | /** |
1047 | * drm_arm_vblank_event - arm vblank event after pageflip | |
1048 | * @dev: DRM device | |
1049 | * @pipe: CRTC index | |
1050 | * @e: the event to prepare to send | |
1051 | * | |
1052 | * A lot of drivers need to generate vblank events for the very next vblank | |
1053 | * interrupt. For example when the page flip interrupt happens when the page | |
1054 | * flip gets armed, but not when it actually executes within the next vblank | |
1055 | * period. This helper function implements exactly the required vblank arming | |
1056 | * behaviour. | |
1057 | * | |
1058 | * Caller must hold event lock. Caller must also hold a vblank reference for | |
1059 | * the event @e, which will be dropped when the next vblank arrives. | |
1060 | * | |
1061 | * This is the legacy version of drm_crtc_arm_vblank_event(). | |
1062 | */ | |
1063 | void drm_arm_vblank_event(struct drm_device *dev, unsigned int pipe, | |
1064 | struct drm_pending_vblank_event *e) | |
1065 | { | |
1066 | assert_spin_locked(&dev->event_lock); | |
1067 | ||
1068 | e->pipe = pipe; | |
1069 | e->event.sequence = drm_vblank_count(dev, pipe); | |
1070 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
1071 | } | |
1072 | EXPORT_SYMBOL(drm_arm_vblank_event); | |
1073 | ||
1074 | /** | |
1075 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip | |
1076 | * @crtc: the source CRTC of the vblank event | |
1077 | * @e: the event to send | |
1078 | * | |
1079 | * A lot of drivers need to generate vblank events for the very next vblank | |
1080 | * interrupt. For example when the page flip interrupt happens when the page | |
1081 | * flip gets armed, but not when it actually executes within the next vblank | |
1082 | * period. This helper function implements exactly the required vblank arming | |
1083 | * behaviour. | |
1084 | * | |
1085 | * Caller must hold event lock. Caller must also hold a vblank reference for | |
1086 | * the event @e, which will be dropped when the next vblank arrives. | |
1087 | * | |
1088 | * This is the native KMS version of drm_arm_vblank_event(). | |
1089 | */ | |
1090 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, | |
1091 | struct drm_pending_vblank_event *e) | |
1092 | { | |
1093 | drm_arm_vblank_event(crtc->dev, drm_crtc_index(crtc), e); | |
1094 | } | |
1095 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); | |
1096 | ||
c6eefa17 RC |
1097 | /** |
1098 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
1099 | * @dev: DRM device | |
cc1ef118 | 1100 | * @pipe: CRTC index |
c6eefa17 RC |
1101 | * @e: the event to send |
1102 | * | |
1103 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
1104 | * Caller must hold event lock. | |
a4d7b30d TR |
1105 | * |
1106 | * This is the legacy version of drm_crtc_send_vblank_event(). | |
c6eefa17 | 1107 | */ |
cc1ef118 TR |
1108 | void drm_send_vblank_event(struct drm_device *dev, unsigned int pipe, |
1109 | struct drm_pending_vblank_event *e) | |
c6eefa17 RC |
1110 | { |
1111 | struct timeval now; | |
1112 | unsigned int seq; | |
4dfd909f | 1113 | |
2a7d3d6d | 1114 | if (dev->num_crtcs > 0) { |
cc1ef118 | 1115 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c6eefa17 RC |
1116 | } else { |
1117 | seq = 0; | |
c61eef72 ID |
1118 | |
1119 | now = get_drm_timestamp(); | |
c6eefa17 | 1120 | } |
cc1ef118 | 1121 | e->pipe = pipe; |
c6eefa17 RC |
1122 | send_vblank_event(dev, e, seq, &now); |
1123 | } | |
1124 | EXPORT_SYMBOL(drm_send_vblank_event); | |
1125 | ||
a4d7b30d TR |
1126 | /** |
1127 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
1128 | * @crtc: the source CRTC of the vblank event | |
1129 | * @e: the event to send | |
1130 | * | |
1131 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
1132 | * Caller must hold event lock. | |
1133 | * | |
1134 | * This is the native KMS version of drm_send_vblank_event(). | |
1135 | */ | |
1136 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
1137 | struct drm_pending_vblank_event *e) | |
1138 | { | |
1139 | drm_send_vblank_event(crtc->dev, drm_crtc_index(crtc), e); | |
1140 | } | |
1141 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
1142 | ||
f2752282 VS |
1143 | /** |
1144 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
1145 | * @dev: DRM device | |
cc1ef118 | 1146 | * @pipe: CRTC index |
c30e11fc TR |
1147 | * |
1148 | * Returns: | |
1149 | * Zero on success or a negative error code on failure. | |
f2752282 | 1150 | */ |
cc1ef118 | 1151 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1152 | { |
cc1ef118 | 1153 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1154 | int ret = 0; |
1155 | ||
1156 | assert_spin_locked(&dev->vbl_lock); | |
1157 | ||
1158 | spin_lock(&dev->vblank_time_lock); | |
1159 | ||
8a51d5be | 1160 | if (!vblank->enabled) { |
1cfb80b1 DV |
1161 | /* |
1162 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
1163 | * All vblank count & timestamp updates are held off |
1164 | * until we are done reinitializing master counter and | |
1165 | * timestamps. Filtercode in drm_handle_vblank() will | |
1166 | * prevent double-accounting of same vblank interval. | |
1167 | */ | |
cc1ef118 TR |
1168 | ret = dev->driver->enable_vblank(dev, pipe); |
1169 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); | |
f2752282 | 1170 | if (ret) |
8a51d5be | 1171 | atomic_dec(&vblank->refcount); |
f2752282 | 1172 | else { |
8a51d5be | 1173 | vblank->enabled = true; |
a6e610dc | 1174 | drm_update_vblank_count(dev, pipe, 0); |
f2752282 VS |
1175 | } |
1176 | } | |
1177 | ||
1178 | spin_unlock(&dev->vblank_time_lock); | |
1179 | ||
1180 | return ret; | |
1181 | } | |
1182 | ||
0a3e67a4 JB |
1183 | /** |
1184 | * drm_vblank_get - get a reference count on vblank events | |
1185 | * @dev: DRM device | |
cc1ef118 | 1186 | * @pipe: index of CRTC to own |
0a3e67a4 JB |
1187 | * |
1188 | * Acquire a reference count on vblank events to avoid having them disabled | |
1189 | * while in use. | |
1190 | * | |
89dd6a4b DV |
1191 | * This is the legacy version of drm_crtc_vblank_get(). |
1192 | * | |
f5752b38 | 1193 | * Returns: |
c30e11fc | 1194 | * Zero on success or a negative error code on failure. |
0a3e67a4 | 1195 | */ |
cc1ef118 | 1196 | int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1197 | { |
cc1ef118 | 1198 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
97cbc883 | 1199 | unsigned long irqflags; |
0a3e67a4 JB |
1200 | int ret = 0; |
1201 | ||
16e3247d GH |
1202 | if (!dev->num_crtcs) |
1203 | return -EINVAL; | |
1204 | ||
cc1ef118 | 1205 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1206 | return -EINVAL; |
1207 | ||
0a3e67a4 JB |
1208 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1209 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 1210 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
cc1ef118 | 1211 | ret = drm_vblank_enable(dev, pipe); |
778c9026 | 1212 | } else { |
8a51d5be VS |
1213 | if (!vblank->enabled) { |
1214 | atomic_dec(&vblank->refcount); | |
778c9026 | 1215 | ret = -EINVAL; |
0a3e67a4 JB |
1216 | } |
1217 | } | |
1218 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1219 | ||
1220 | return ret; | |
1221 | } | |
1222 | EXPORT_SYMBOL(drm_vblank_get); | |
1223 | ||
89dd6a4b DV |
1224 | /** |
1225 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1226 | * @crtc: which CRTC to own | |
1227 | * | |
1228 | * Acquire a reference count on vblank events to avoid having them disabled | |
1229 | * while in use. | |
1230 | * | |
30b79f06 | 1231 | * This is the native kms version of drm_vblank_get(). |
89dd6a4b DV |
1232 | * |
1233 | * Returns: | |
c30e11fc | 1234 | * Zero on success or a negative error code on failure. |
89dd6a4b DV |
1235 | */ |
1236 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1237 | { | |
1238 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1239 | } | |
1240 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1241 | ||
0a3e67a4 | 1242 | /** |
cc1ef118 | 1243 | * drm_vblank_put - release ownership of vblank events |
0a3e67a4 | 1244 | * @dev: DRM device |
cc1ef118 | 1245 | * @pipe: index of CRTC to release |
0a3e67a4 JB |
1246 | * |
1247 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 1248 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
1249 | * |
1250 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 | 1251 | */ |
cc1ef118 | 1252 | void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1253 | { |
cc1ef118 | 1254 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1255 | |
cc1ef118 | 1256 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7f907bf2 | 1257 | return; |
b3f5e732 | 1258 | |
7d1de851 | 1259 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) |
e6ae8687 RC |
1260 | return; |
1261 | ||
0a3e67a4 | 1262 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1263 | if (atomic_dec_and_test(&vblank->refcount)) { |
ab8905f1 DV |
1264 | if (drm_vblank_offdelay == 0) |
1265 | return; | |
1266 | else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) | |
4ed0ce3d | 1267 | vblank_disable_fn((unsigned long)vblank); |
ab8905f1 | 1268 | else |
4ed0ce3d VS |
1269 | mod_timer(&vblank->disable_timer, |
1270 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1271 | } | |
0a3e67a4 JB |
1272 | } |
1273 | EXPORT_SYMBOL(drm_vblank_put); | |
1274 | ||
89dd6a4b DV |
1275 | /** |
1276 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1277 | * @crtc: which counter to give up | |
1278 | * | |
1279 | * Release ownership of a given vblank counter, turning off interrupts | |
1280 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1281 | * | |
1282 | * This is the native kms version of drm_vblank_put(). | |
1283 | */ | |
1284 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1285 | { | |
1286 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1287 | } | |
1288 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1289 | ||
e8450f51 DV |
1290 | /** |
1291 | * drm_wait_one_vblank - wait for one vblank | |
1292 | * @dev: DRM device | |
cc1ef118 | 1293 | * @pipe: CRTC index |
e8450f51 | 1294 | * |
1da248a5 VS |
1295 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. |
1296 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
e8450f51 DV |
1297 | * due to lack of driver support or because the crtc is off. |
1298 | */ | |
cc1ef118 | 1299 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) |
e8450f51 | 1300 | { |
cc1ef118 | 1301 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
e8450f51 DV |
1302 | int ret; |
1303 | u32 last; | |
1304 | ||
cc1ef118 | 1305 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1306 | return; |
1307 | ||
cc1ef118 TR |
1308 | ret = drm_vblank_get(dev, pipe); |
1309 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |
e8450f51 DV |
1310 | return; |
1311 | ||
cc1ef118 | 1312 | last = drm_vblank_count(dev, pipe); |
e8450f51 | 1313 | |
cc1ef118 TR |
1314 | ret = wait_event_timeout(vblank->queue, |
1315 | last != drm_vblank_count(dev, pipe), | |
e8450f51 DV |
1316 | msecs_to_jiffies(100)); |
1317 | ||
cc1ef118 | 1318 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); |
e8450f51 | 1319 | |
cc1ef118 | 1320 | drm_vblank_put(dev, pipe); |
e8450f51 DV |
1321 | } |
1322 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1323 | ||
1324 | /** | |
1325 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1326 | * @crtc: DRM crtc | |
1327 | * | |
1328 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1329 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1330 | * due to lack of driver support or because the crtc is off. | |
1331 | */ | |
1332 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1333 | { | |
1334 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1335 | } | |
1336 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1337 | ||
c6eefa17 RC |
1338 | /** |
1339 | * drm_vblank_off - disable vblank events on a CRTC | |
1340 | * @dev: DRM device | |
cc1ef118 | 1341 | * @pipe: CRTC index |
c6eefa17 | 1342 | * |
f5752b38 DV |
1343 | * Drivers can use this function to shut down the vblank interrupt handling when |
1344 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1345 | * stored so that drm_vblank_on() can restore it again. | |
1346 | * | |
1347 | * Drivers must use this function when the hardware vblank counter can get | |
1348 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1349 | * |
1350 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1351 | */ |
cc1ef118 | 1352 | void drm_vblank_off(struct drm_device *dev, unsigned int pipe) |
778c9026 | 1353 | { |
cc1ef118 | 1354 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
498548ec CJHR |
1355 | struct drm_pending_vblank_event *e, *t; |
1356 | struct timeval now; | |
778c9026 | 1357 | unsigned long irqflags; |
498548ec | 1358 | unsigned int seq; |
778c9026 | 1359 | |
cc1ef118 | 1360 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1361 | return; |
1362 | ||
56cc279b VS |
1363 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1364 | ||
1365 | spin_lock(&dev->vbl_lock); | |
e8235891 MK |
1366 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", |
1367 | pipe, vblank->enabled, vblank->inmodeset); | |
1368 | ||
1369 | /* Avoid redundant vblank disables without previous drm_vblank_on(). */ | |
1370 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) | |
1371 | vblank_disable_and_save(dev, pipe); | |
1372 | ||
8a51d5be | 1373 | wake_up(&vblank->queue); |
498548ec | 1374 | |
56cc279b VS |
1375 | /* |
1376 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1377 | * the vblank interrupt by bumping the refcount. | |
1378 | */ | |
1379 | if (!vblank->inmodeset) { | |
1380 | atomic_inc(&vblank->refcount); | |
1381 | vblank->inmodeset = 1; | |
1382 | } | |
1383 | spin_unlock(&dev->vbl_lock); | |
1384 | ||
498548ec | 1385 | /* Send any queued vblank events, lest the natives grow disquiet */ |
cc1ef118 | 1386 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
e7783ba3 | 1387 | |
498548ec | 1388 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
cc1ef118 | 1389 | if (e->pipe != pipe) |
498548ec | 1390 | continue; |
44844892 VS |
1391 | DRM_DEBUG("Sending premature vblank event on disable: " |
1392 | "wanted %d, current %d\n", | |
498548ec | 1393 | e->event.sequence, seq); |
c6eefa17 | 1394 | list_del(&e->base.link); |
cc1ef118 | 1395 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1396 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1397 | } |
56cc279b | 1398 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 LP |
1399 | } |
1400 | EXPORT_SYMBOL(drm_vblank_off); | |
1401 | ||
89dd6a4b DV |
1402 | /** |
1403 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1404 | * @crtc: CRTC in question | |
1405 | * | |
1406 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1407 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1408 | * stored so that drm_vblank_on can restore it again. | |
1409 | * | |
1410 | * Drivers must use this function when the hardware vblank counter can get | |
1411 | * reset, e.g. when suspending. | |
1412 | * | |
1413 | * This is the native kms version of drm_vblank_off(). | |
1414 | */ | |
1415 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1416 | { | |
1417 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1418 | } | |
1419 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1420 | ||
9625604c DV |
1421 | /** |
1422 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
2b193f02 | 1423 | * @crtc: CRTC in question |
9625604c DV |
1424 | * |
1425 | * Drivers can use this function to reset the vblank state to off at load time. | |
1426 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1427 | * drm_crtc_vblank_on() functions. The difference compared to | |
1428 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1429 | * and hence doesn't need to call any driver hooks. | |
1430 | */ | |
2b193f02 | 1431 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) |
9625604c | 1432 | { |
2b193f02 | 1433 | struct drm_device *dev = crtc->dev; |
9625604c | 1434 | unsigned long irqflags; |
2b193f02 | 1435 | unsigned int pipe = drm_crtc_index(crtc); |
1da248a5 | 1436 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
9625604c DV |
1437 | |
1438 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1439 | /* | |
1440 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1441 | * interrupt by bumping the refcount. | |
1442 | */ | |
1443 | if (!vblank->inmodeset) { | |
1444 | atomic_inc(&vblank->refcount); | |
1445 | vblank->inmodeset = 1; | |
1446 | } | |
1447 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1448 | ||
1449 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1450 | } | |
1451 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1452 | ||
f2752282 VS |
1453 | /** |
1454 | * drm_vblank_on - enable vblank events on a CRTC | |
1455 | * @dev: DRM device | |
cc1ef118 | 1456 | * @pipe: CRTC index |
f5752b38 DV |
1457 | * |
1458 | * This functions restores the vblank interrupt state captured with | |
1459 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1460 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
f5752b38 | 1461 | * in driver load code to reflect the current hardware state of the crtc. |
89dd6a4b DV |
1462 | * |
1463 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 | 1464 | */ |
cc1ef118 | 1465 | void drm_vblank_on(struct drm_device *dev, unsigned int pipe) |
f2752282 | 1466 | { |
cc1ef118 | 1467 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f2752282 VS |
1468 | unsigned long irqflags; |
1469 | ||
cc1ef118 | 1470 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1471 | return; |
1472 | ||
f2752282 | 1473 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
e8235891 MK |
1474 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", |
1475 | pipe, vblank->enabled, vblank->inmodeset); | |
1476 | ||
7ffd7a68 | 1477 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1478 | if (vblank->inmodeset) { |
1479 | atomic_dec(&vblank->refcount); | |
1480 | vblank->inmodeset = 0; | |
7ffd7a68 | 1481 | } |
f8ad028c | 1482 | |
4dfd6486 VS |
1483 | drm_reset_vblank_timestamp(dev, pipe); |
1484 | ||
cd19e52a VS |
1485 | /* |
1486 | * re-enable interrupts if there are users left, or the | |
1487 | * user wishes vblank interrupts to be enabled all the time. | |
1488 | */ | |
bb74fc1b | 1489 | if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) |
cc1ef118 | 1490 | WARN_ON(drm_vblank_enable(dev, pipe)); |
f2752282 VS |
1491 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1492 | } | |
1493 | EXPORT_SYMBOL(drm_vblank_on); | |
1494 | ||
89dd6a4b DV |
1495 | /** |
1496 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1497 | * @crtc: CRTC in question | |
1498 | * | |
1499 | * This functions restores the vblank interrupt state captured with | |
1500 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1501 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
89dd6a4b DV |
1502 | * in driver load code to reflect the current hardware state of the crtc. |
1503 | * | |
1504 | * This is the native kms version of drm_vblank_on(). | |
1505 | */ | |
1506 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1507 | { | |
1508 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1509 | } | |
1510 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1511 | ||
f453ba04 DA |
1512 | /** |
1513 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1514 | * @dev: DRM device | |
cc1ef118 | 1515 | * @pipe: CRTC index |
f453ba04 DA |
1516 | * |
1517 | * Account for vblank events across mode setting events, which will likely | |
1518 | * reset the hardware frame counter. | |
f5752b38 DV |
1519 | * |
1520 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1521 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1522 | * software-side vblank frame counting will ensure that there are no jumps or | |
1523 | * discontinuities. | |
1524 | * | |
1525 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1526 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1527 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1528 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1529 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1530 | * counters. | |
1531 | * | |
1532 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1533 | * again. | |
f453ba04 | 1534 | */ |
cc1ef118 | 1535 | void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe) |
f453ba04 | 1536 | { |
cc1ef118 | 1537 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
8a51d5be | 1538 | |
b7ea85a4 | 1539 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1540 | if (!dev->num_crtcs) |
1541 | return; | |
e6ae8687 | 1542 | |
cc1ef118 | 1543 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1544 | return; |
1545 | ||
f453ba04 DA |
1546 | /* |
1547 | * To avoid all the problems that might happen if interrupts | |
1548 | * were enabled/disabled around or between these calls, we just | |
1549 | * have the kernel take a reference on the CRTC (just once though | |
1550 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1551 | * so that interrupts remain enabled in the interim. | |
1552 | */ | |
8a51d5be VS |
1553 | if (!vblank->inmodeset) { |
1554 | vblank->inmodeset = 0x1; | |
cc1ef118 | 1555 | if (drm_vblank_get(dev, pipe) == 0) |
8a51d5be | 1556 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1557 | } |
1558 | } | |
1559 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1560 | ||
f5752b38 DV |
1561 | /** |
1562 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1563 | * @dev: DRM device | |
cc1ef118 | 1564 | * @pipe: CRTC index |
f5752b38 DV |
1565 | * |
1566 | * This function again drops the temporary vblank reference acquired in | |
1567 | * drm_vblank_pre_modeset. | |
1568 | */ | |
cc1ef118 | 1569 | void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe) |
f453ba04 | 1570 | { |
cc1ef118 | 1571 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
f453ba04 DA |
1572 | unsigned long irqflags; |
1573 | ||
b7ea85a4 HC |
1574 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1575 | if (!dev->num_crtcs) | |
1576 | return; | |
1577 | ||
cc1ef118 | 1578 | if (WARN_ON(pipe >= dev->num_crtcs)) |
7d1de851 TR |
1579 | return; |
1580 | ||
8a51d5be | 1581 | if (vblank->inmodeset) { |
f453ba04 | 1582 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
c61934ed | 1583 | drm_reset_vblank_timestamp(dev, pipe); |
f453ba04 | 1584 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1585 | |
8a51d5be | 1586 | if (vblank->inmodeset & 0x2) |
cc1ef118 | 1587 | drm_vblank_put(dev, pipe); |
b3f5e732 | 1588 | |
8a51d5be | 1589 | vblank->inmodeset = 0; |
f453ba04 DA |
1590 | } |
1591 | } | |
1592 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1593 | ||
f5752b38 | 1594 | /* |
0a3e67a4 JB |
1595 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1596 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1597 | * | |
1598 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1599 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1600 | * | |
1601 | * Generally the counter will reset across mode sets. If interrupts are | |
1602 | * enabled around this call, we don't have to do anything since the counter | |
1603 | * will have already been incremented. | |
1604 | */ | |
1605 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1606 | struct drm_file *file_priv) | |
1607 | { | |
1608 | struct drm_modeset_ctl *modeset = data; | |
cc1ef118 | 1609 | unsigned int pipe; |
0a3e67a4 JB |
1610 | |
1611 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1612 | if (!dev->num_crtcs) | |
4a1b0714 | 1613 | return 0; |
0a3e67a4 | 1614 | |
29935554 LP |
1615 | /* KMS drivers handle this internally */ |
1616 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1617 | return 0; | |
1618 | ||
cc1ef118 TR |
1619 | pipe = modeset->crtc; |
1620 | if (pipe >= dev->num_crtcs) | |
4a1b0714 | 1621 | return -EINVAL; |
0a3e67a4 | 1622 | |
0a3e67a4 JB |
1623 | switch (modeset->cmd) { |
1624 | case _DRM_PRE_MODESET: | |
cc1ef118 | 1625 | drm_vblank_pre_modeset(dev, pipe); |
0a3e67a4 JB |
1626 | break; |
1627 | case _DRM_POST_MODESET: | |
cc1ef118 | 1628 | drm_vblank_post_modeset(dev, pipe); |
0a3e67a4 JB |
1629 | break; |
1630 | default: | |
4a1b0714 | 1631 | return -EINVAL; |
0a3e67a4 JB |
1632 | } |
1633 | ||
4a1b0714 | 1634 | return 0; |
0a3e67a4 JB |
1635 | } |
1636 | ||
cc1ef118 | 1637 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, |
c9a9c5e0 KH |
1638 | union drm_wait_vblank *vblwait, |
1639 | struct drm_file *file_priv) | |
1640 | { | |
ffe7c73a | 1641 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1642 | struct drm_pending_vblank_event *e; |
1643 | struct timeval now; | |
1644 | unsigned long flags; | |
1645 | unsigned int seq; | |
ea5d552c | 1646 | int ret; |
c9a9c5e0 | 1647 | |
f76511b9 | 1648 | e = kzalloc(sizeof(*e), GFP_KERNEL); |
ea5d552c CW |
1649 | if (e == NULL) { |
1650 | ret = -ENOMEM; | |
1651 | goto err_put; | |
1652 | } | |
c9a9c5e0 KH |
1653 | |
1654 | e->pipe = pipe; | |
b9c2c9ae | 1655 | e->base.pid = current->pid; |
c9a9c5e0 | 1656 | e->event.base.type = DRM_EVENT_VBLANK; |
f76511b9 | 1657 | e->event.base.length = sizeof(e->event); |
c9a9c5e0 | 1658 | e->event.user_data = vblwait->request.signal; |
c9a9c5e0 | 1659 | |
c9a9c5e0 KH |
1660 | spin_lock_irqsave(&dev->event_lock, flags); |
1661 | ||
ffe7c73a VS |
1662 | /* |
1663 | * drm_vblank_off() might have been called after we called | |
1664 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1665 | * around the vblank disable, so no need for further locking. | |
1666 | * The reference from drm_vblank_get() protects against | |
1667 | * vblank disable from another source. | |
1668 | */ | |
1669 | if (!vblank->enabled) { | |
1670 | ret = -EINVAL; | |
1671 | goto err_unlock; | |
1672 | } | |
1673 | ||
4020b220 DV |
1674 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, |
1675 | &e->event.base); | |
1676 | ||
1677 | if (ret) | |
ea5d552c | 1678 | goto err_unlock; |
c9a9c5e0 | 1679 | |
27641c3f MK |
1680 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1681 | ||
c9a9c5e0 KH |
1682 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1683 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1684 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1685 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1686 | } |
1687 | ||
cc1ef118 | 1688 | DRM_DEBUG("event on vblank count %d, current %d, crtc %u\n", |
c9a9c5e0 KH |
1689 | vblwait->request.sequence, seq, pipe); |
1690 | ||
b9c2c9ae JB |
1691 | trace_drm_vblank_event_queued(current->pid, pipe, |
1692 | vblwait->request.sequence); | |
1693 | ||
c9a9c5e0 KH |
1694 | e->event.sequence = vblwait->request.sequence; |
1695 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1696 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1697 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1698 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1699 | } else { |
a6778e9e | 1700 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1701 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1702 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1703 | } |
1704 | ||
1705 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1706 | ||
1707 | return 0; | |
ea5d552c CW |
1708 | |
1709 | err_unlock: | |
1710 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1711 | kfree(e); | |
1712 | err_put: | |
6f331623 | 1713 | drm_vblank_put(dev, pipe); |
ea5d552c | 1714 | return ret; |
c9a9c5e0 KH |
1715 | } |
1716 | ||
f5752b38 | 1717 | /* |
1da177e4 LT |
1718 | * Wait for VBLANK. |
1719 | * | |
1720 | * \param inode device inode. | |
6c340eac | 1721 | * \param file_priv DRM file private. |
1da177e4 LT |
1722 | * \param cmd command. |
1723 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1724 | * \return zero on success or a negative number on failure. | |
1725 | * | |
30b23634 EA |
1726 | * This function enables the vblank interrupt on the pipe requested, then |
1727 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1728 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1729 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1730 | */ |
0a3e67a4 JB |
1731 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1732 | struct drm_file *file_priv) | |
1da177e4 | 1733 | { |
8a51d5be | 1734 | struct drm_vblank_crtc *vblank; |
c153f45f | 1735 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1736 | int ret; |
cc1ef118 | 1737 | unsigned int flags, seq, pipe, high_pipe; |
1da177e4 | 1738 | |
4984979b DV |
1739 | if (!dev->irq_enabled) |
1740 | return -EINVAL; | |
1da177e4 | 1741 | |
30b23634 EA |
1742 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1743 | return -EINVAL; | |
1744 | ||
c153f45f | 1745 | if (vblwait->request.type & |
19b01b5f IH |
1746 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1747 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1748 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1749 | vblwait->request.type, |
19b01b5f IH |
1750 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1751 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MD |
1752 | return -EINVAL; |
1753 | } | |
1754 | ||
c153f45f | 1755 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
cc1ef118 TR |
1756 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1757 | if (high_pipe) | |
1758 | pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
19b01b5f | 1759 | else |
cc1ef118 TR |
1760 | pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1761 | if (pipe >= dev->num_crtcs) | |
776c9443 MD |
1762 | return -EINVAL; |
1763 | ||
cc1ef118 | 1764 | vblank = &dev->vblank[pipe]; |
8a51d5be | 1765 | |
cc1ef118 | 1766 | ret = drm_vblank_get(dev, pipe); |
0a3e67a4 | 1767 | if (ret) { |
8d3457ec | 1768 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1769 | return ret; |
1770 | } | |
cc1ef118 | 1771 | seq = drm_vblank_count(dev, pipe); |
776c9443 | 1772 | |
c153f45f | 1773 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1774 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1775 | vblwait->request.sequence += seq; |
1776 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1777 | case _DRM_VBLANK_ABSOLUTE: |
1778 | break; | |
1779 | default: | |
0a3e67a4 JB |
1780 | ret = -EINVAL; |
1781 | goto done; | |
1da177e4 LT |
1782 | } |
1783 | ||
a6778e9e IH |
1784 | if (flags & _DRM_VBLANK_EVENT) { |
1785 | /* must hold on to the vblank ref until the event fires | |
1786 | * drm_vblank_put will be called asynchronously | |
1787 | */ | |
cc1ef118 | 1788 | return drm_queue_vblank_event(dev, pipe, vblwait, file_priv); |
a6778e9e | 1789 | } |
c9a9c5e0 | 1790 | |
ab285d74 | 1791 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1792 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1793 | vblwait->request.sequence = seq + 1; | |
ab285d74 MD |
1794 | } |
1795 | ||
cc1ef118 TR |
1796 | DRM_DEBUG("waiting on vblank count %d, crtc %u\n", |
1797 | vblwait->request.sequence, pipe); | |
8a51d5be VS |
1798 | vblank->last_wait = vblwait->request.sequence; |
1799 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
cc1ef118 | 1800 | (((drm_vblank_count(dev, pipe) - |
30b23634 | 1801 | vblwait->request.sequence) <= (1 << 23)) || |
8a51d5be | 1802 | !vblank->enabled || |
30b23634 | 1803 | !dev->irq_enabled)); |
1da177e4 | 1804 | |
30b23634 EA |
1805 | if (ret != -EINTR) { |
1806 | struct timeval now; | |
1da177e4 | 1807 | |
cc1ef118 | 1808 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, pipe, &now); |
30b23634 EA |
1809 | vblwait->reply.tval_sec = now.tv_sec; |
1810 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1811 | |
30b23634 EA |
1812 | DRM_DEBUG("returning %d to client\n", |
1813 | vblwait->reply.sequence); | |
1da177e4 | 1814 | } else { |
30b23634 | 1815 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1816 | } |
1817 | ||
0a3e67a4 | 1818 | done: |
cc1ef118 | 1819 | drm_vblank_put(dev, pipe); |
1da177e4 LT |
1820 | return ret; |
1821 | } | |
1822 | ||
cc1ef118 | 1823 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) |
c9a9c5e0 KH |
1824 | { |
1825 | struct drm_pending_vblank_event *e, *t; | |
1826 | struct timeval now; | |
c9a9c5e0 KH |
1827 | unsigned int seq; |
1828 | ||
56cc279b | 1829 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1830 | |
cc1ef118 | 1831 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
c9a9c5e0 KH |
1832 | |
1833 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
cc1ef118 | 1834 | if (e->pipe != pipe) |
c9a9c5e0 KH |
1835 | continue; |
1836 | if ((seq - e->event.sequence) > (1<<23)) | |
1837 | continue; | |
1838 | ||
1839 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1840 | e->event.sequence, seq); | |
1841 | ||
c6eefa17 | 1842 | list_del(&e->base.link); |
cc1ef118 | 1843 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1844 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1845 | } |
1846 | ||
cc1ef118 | 1847 | trace_drm_vblank_event(pipe, seq); |
c9a9c5e0 KH |
1848 | } |
1849 | ||
0a3e67a4 JB |
1850 | /** |
1851 | * drm_handle_vblank - handle a vblank event | |
1852 | * @dev: DRM device | |
cc1ef118 | 1853 | * @pipe: index of CRTC where this event occurred |
0a3e67a4 JB |
1854 | * |
1855 | * Drivers should call this routine in their vblank interrupt handlers to | |
1856 | * update the vblank counter and send any signals that may be pending. | |
115ebcd4 TR |
1857 | * |
1858 | * This is the legacy version of drm_crtc_handle_vblank(). | |
0a3e67a4 | 1859 | */ |
cc1ef118 | 1860 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) |
0a3e67a4 | 1861 | { |
cc1ef118 | 1862 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
27641c3f MK |
1863 | unsigned long irqflags; |
1864 | ||
ee3c7795 | 1865 | if (WARN_ON_ONCE(!dev->num_crtcs)) |
78c6e170 | 1866 | return false; |
c9a9c5e0 | 1867 | |
cc1ef118 | 1868 | if (WARN_ON(pipe >= dev->num_crtcs)) |
e6ae8687 RC |
1869 | return false; |
1870 | ||
56cc279b VS |
1871 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1872 | ||
27641c3f MK |
1873 | /* Need timestamp lock to prevent concurrent execution with |
1874 | * vblank enable/disable, as this would cause inconsistent | |
1875 | * or corrupted timestamps and vblank counts. | |
1876 | */ | |
56cc279b | 1877 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1878 | |
1879 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1880 | if (!vblank->enabled) { |
56cc279b VS |
1881 | spin_unlock(&dev->vblank_time_lock); |
1882 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1883 | return false; |
27641c3f MK |
1884 | } |
1885 | ||
4dfd6486 | 1886 | drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ); |
27641c3f | 1887 | |
56cc279b VS |
1888 | spin_unlock(&dev->vblank_time_lock); |
1889 | ||
8a51d5be | 1890 | wake_up(&vblank->queue); |
cc1ef118 | 1891 | drm_handle_vblank_events(dev, pipe); |
27641c3f | 1892 | |
56cc279b VS |
1893 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1894 | ||
78c6e170 | 1895 | return true; |
0a3e67a4 JB |
1896 | } |
1897 | EXPORT_SYMBOL(drm_handle_vblank); | |
115ebcd4 TR |
1898 | |
1899 | /** | |
1900 | * drm_crtc_handle_vblank - handle a vblank event | |
1901 | * @crtc: where this event occurred | |
1902 | * | |
1903 | * Drivers should call this routine in their vblank interrupt handlers to | |
1904 | * update the vblank counter and send any signals that may be pending. | |
1905 | * | |
1906 | * This is the native KMS version of drm_handle_vblank(). | |
1907 | * | |
1908 | * Returns: | |
1909 | * True if the event was successfully handled, false on failure. | |
1910 | */ | |
1911 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1912 | { | |
1913 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1914 | } | |
1915 | EXPORT_SYMBOL(drm_crtc_handle_vblank); | |
b44f8408 VS |
1916 | |
1917 | /** | |
1918 | * drm_vblank_no_hw_counter - "No hw counter" implementation of .get_vblank_counter() | |
1919 | * @dev: DRM device | |
1920 | * @pipe: CRTC for which to read the counter | |
1921 | * | |
1922 | * Drivers can plug this into the .get_vblank_counter() function if | |
1923 | * there is no useable hardware frame counter available. | |
1924 | * | |
1925 | * Returns: | |
1926 | * 0 | |
1927 | */ | |
1928 | u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) | |
1929 | { | |
1930 | return 0; | |
1931 | } | |
1932 | EXPORT_SYMBOL(drm_vblank_no_hw_counter); |