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3ed4351a DV |
1 | /* |
2 | * drm_irq.c IRQ and vblank support | |
3 | * | |
4 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
5 | * \author Gareth Hughes <gareth@valinux.com> | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a | |
8 | * copy of this software and associated documentation files (the "Software"), | |
9 | * to deal in the Software without restriction, including without limitation | |
10 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
11 | * and/or sell copies of the Software, and to permit persons to whom the | |
12 | * Software is furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the next | |
15 | * paragraph) shall be included in all copies or substantial portions of the | |
16 | * Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
21 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
22 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
23 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
24 | * OTHER DEALINGS IN THE SOFTWARE. | |
25 | */ | |
26 | ||
27 | #include <drm/drm_vblank.h> | |
28 | #include <drm/drmP.h> | |
29 | #include <linux/export.h> | |
30 | ||
31 | #include "drm_trace.h" | |
32 | #include "drm_internal.h" | |
33 | ||
57d30230 DV |
34 | /** |
35 | * DOC: vblank handling | |
36 | * | |
37 | * Vertical blanking plays a major role in graphics rendering. To achieve | |
38 | * tear-free display, users must synchronize page flips and/or rendering to | |
39 | * vertical blanking. The DRM API offers ioctls to perform page flips | |
40 | * synchronized to vertical blanking and wait for vertical blanking. | |
41 | * | |
42 | * The DRM core handles most of the vertical blanking management logic, which | |
43 | * involves filtering out spurious interrupts, keeping race-free blanking | |
44 | * counters, coping with counter wrap-around and resets and keeping use counts. | |
45 | * It relies on the driver to generate vertical blanking interrupts and | |
46 | * optionally provide a hardware vertical blanking counter. | |
47 | * | |
48 | * Drivers must initialize the vertical blanking handling core with a call to | |
49 | * drm_vblank_init(). Minimally, a driver needs to implement | |
50 | * &drm_crtc_funcs.enable_vblank and &drm_crtc_funcs.disable_vblank plus call | |
51 | * drm_crtc_handle_vblank() in it's vblank interrupt handler for working vblank | |
52 | * support. | |
53 | * | |
54 | * Vertical blanking interrupts can be enabled by the DRM core or by drivers | |
55 | * themselves (for instance to handle page flipping operations). The DRM core | |
56 | * maintains a vertical blanking use count to ensure that the interrupts are not | |
57 | * disabled while a user still needs them. To increment the use count, drivers | |
58 | * call drm_crtc_vblank_get() and release the vblank reference again with | |
59 | * drm_crtc_vblank_put(). In between these two calls vblank interrupts are | |
60 | * guaranteed to be enabled. | |
61 | * | |
62 | * On many hardware disabling the vblank interrupt cannot be done in a race-free | |
63 | * manner, see &drm_driver.vblank_disable_immediate and | |
64 | * &drm_driver.max_vblank_count. In that case the vblank core only disables the | |
65 | * vblanks after a timer has expired, which can be configured through the | |
66 | * ``vblankoffdelay`` module parameter. | |
67 | */ | |
68 | ||
3ed4351a DV |
69 | /* Retry timestamp calculation up to 3 times to satisfy |
70 | * drm_timestamp_precision before giving up. | |
71 | */ | |
72 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
73 | ||
74 | /* Threshold in nanoseconds for detection of redundant | |
75 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
76 | */ | |
77 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
78 | ||
79 | static bool | |
80 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 81 | ktime_t *tvblank, bool in_vblank_irq); |
3ed4351a DV |
82 | |
83 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ | |
84 | ||
3ed4351a DV |
85 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ |
86 | ||
87 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
88 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
3ed4351a DV |
89 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); |
90 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); | |
3ed4351a DV |
91 | |
92 | static void store_vblank(struct drm_device *dev, unsigned int pipe, | |
93 | u32 vblank_count_inc, | |
67680d3c | 94 | ktime_t t_vblank, u32 last) |
3ed4351a DV |
95 | { |
96 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
97 | ||
98 | assert_spin_locked(&dev->vblank_time_lock); | |
99 | ||
100 | vblank->last = last; | |
101 | ||
102 | write_seqlock(&vblank->seqlock); | |
67680d3c | 103 | vblank->time = t_vblank; |
3ed4351a DV |
104 | vblank->count += vblank_count_inc; |
105 | write_sequnlock(&vblank->seqlock); | |
106 | } | |
107 | ||
108 | /* | |
109 | * "No hw counter" fallback implementation of .get_vblank_counter() hook, | |
110 | * if there is no useable hardware frame counter available. | |
111 | */ | |
112 | static u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) | |
113 | { | |
114 | WARN_ON_ONCE(dev->max_vblank_count != 0); | |
115 | return 0; | |
116 | } | |
117 | ||
118 | static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe) | |
119 | { | |
120 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
121 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
122 | ||
123 | if (crtc->funcs->get_vblank_counter) | |
124 | return crtc->funcs->get_vblank_counter(crtc); | |
125 | } | |
126 | ||
127 | if (dev->driver->get_vblank_counter) | |
128 | return dev->driver->get_vblank_counter(dev, pipe); | |
129 | ||
130 | return drm_vblank_no_hw_counter(dev, pipe); | |
131 | } | |
132 | ||
133 | /* | |
134 | * Reset the stored timestamp for the current vblank count to correspond | |
135 | * to the last vblank occurred. | |
136 | * | |
137 | * Only to be called from drm_crtc_vblank_on(). | |
138 | * | |
139 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes | |
140 | * device vblank fields. | |
141 | */ | |
142 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) | |
143 | { | |
144 | u32 cur_vblank; | |
145 | bool rc; | |
67680d3c | 146 | ktime_t t_vblank; |
3ed4351a DV |
147 | int count = DRM_TIMESTAMP_MAXRETRIES; |
148 | ||
149 | spin_lock(&dev->vblank_time_lock); | |
150 | ||
151 | /* | |
152 | * sample the current counter to avoid random jumps | |
153 | * when drm_vblank_enable() applies the diff | |
154 | */ | |
155 | do { | |
156 | cur_vblank = __get_vblank_counter(dev, pipe); | |
157 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false); | |
158 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
159 | ||
160 | /* | |
161 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
162 | * available and didn't fail. Otherwise reinitialize delayed at next vblank | |
163 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
164 | */ | |
165 | if (!rc) | |
67680d3c | 166 | t_vblank = 0; |
3ed4351a DV |
167 | |
168 | /* | |
169 | * +1 to make sure user will never see the same | |
170 | * vblank counter value before and after a modeset | |
171 | */ | |
67680d3c | 172 | store_vblank(dev, pipe, 1, t_vblank, cur_vblank); |
3ed4351a DV |
173 | |
174 | spin_unlock(&dev->vblank_time_lock); | |
175 | } | |
176 | ||
177 | /* | |
178 | * Call back into the driver to update the appropriate vblank counter | |
179 | * (specified by @pipe). Deal with wraparound, if it occurred, and | |
180 | * update the last read value so we can deal with wraparound on the next | |
181 | * call if necessary. | |
182 | * | |
183 | * Only necessary when going from off->on, to account for frames we | |
184 | * didn't get an interrupt for. | |
185 | * | |
186 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes | |
187 | * device vblank fields. | |
188 | */ | |
189 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, | |
190 | bool in_vblank_irq) | |
191 | { | |
192 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
193 | u32 cur_vblank, diff; | |
194 | bool rc; | |
67680d3c | 195 | ktime_t t_vblank; |
3ed4351a DV |
196 | int count = DRM_TIMESTAMP_MAXRETRIES; |
197 | int framedur_ns = vblank->framedur_ns; | |
198 | ||
199 | /* | |
200 | * Interrupts were disabled prior to this call, so deal with counter | |
201 | * wrap if needed. | |
202 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events | |
203 | * here if the register is small or we had vblank interrupts off for | |
204 | * a long time. | |
205 | * | |
206 | * We repeat the hardware vblank counter & timestamp query until | |
207 | * we get consistent results. This to prevent races between gpu | |
208 | * updating its hardware counter while we are retrieving the | |
209 | * corresponding vblank timestamp. | |
210 | */ | |
211 | do { | |
212 | cur_vblank = __get_vblank_counter(dev, pipe); | |
213 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq); | |
214 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
215 | ||
216 | if (dev->max_vblank_count != 0) { | |
217 | /* trust the hw counter when it's around */ | |
218 | diff = (cur_vblank - vblank->last) & dev->max_vblank_count; | |
219 | } else if (rc && framedur_ns) { | |
67680d3c | 220 | u64 diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); |
3ed4351a DV |
221 | |
222 | /* | |
223 | * Figure out how many vblanks we've missed based | |
224 | * on the difference in the timestamps and the | |
225 | * frame/field duration. | |
226 | */ | |
227 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |
228 | ||
229 | if (diff == 0 && in_vblank_irq) | |
230 | DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored." | |
231 | " diff_ns = %lld, framedur_ns = %d)\n", | |
232 | pipe, (long long) diff_ns, framedur_ns); | |
233 | } else { | |
234 | /* some kind of default for drivers w/o accurate vbl timestamping */ | |
235 | diff = in_vblank_irq ? 1 : 0; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset | |
240 | * interval? If so then vblank irqs keep running and it will likely | |
241 | * happen that the hardware vblank counter is not trustworthy as it | |
242 | * might reset at some point in that interval and vblank timestamps | |
243 | * are not trustworthy either in that interval. Iow. this can result | |
244 | * in a bogus diff >> 1 which must be avoided as it would cause | |
245 | * random large forward jumps of the software vblank counter. | |
246 | */ | |
247 | if (diff > 1 && (vblank->inmodeset & 0x2)) { | |
248 | DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u" | |
249 | " due to pre-modeset.\n", pipe, diff); | |
250 | diff = 1; | |
251 | } | |
252 | ||
253 | DRM_DEBUG_VBL("updating vblank count on crtc %u:" | |
570e8696 | 254 | " current=%llu, diff=%u, hw=%u hw_last=%u\n", |
3ed4351a DV |
255 | pipe, vblank->count, diff, cur_vblank, vblank->last); |
256 | ||
257 | if (diff == 0) { | |
258 | WARN_ON_ONCE(cur_vblank != vblank->last); | |
259 | return; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
264 | * available and didn't fail, or we were called from the vblank interrupt. | |
265 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 | |
266 | * for now, to mark the vblanktimestamp as invalid. | |
267 | */ | |
138b87fa | 268 | if (!rc && !in_vblank_irq) |
67680d3c | 269 | t_vblank = 0; |
3ed4351a | 270 | |
67680d3c | 271 | store_vblank(dev, pipe, diff, t_vblank, cur_vblank); |
3ed4351a DV |
272 | } |
273 | ||
274 | static u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe) | |
275 | { | |
276 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
277 | ||
278 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
279 | return 0; | |
280 | ||
281 | return vblank->count; | |
282 | } | |
283 | ||
284 | /** | |
ca814b25 | 285 | * drm_crtc_accurate_vblank_count - retrieve the master vblank counter |
3ed4351a DV |
286 | * @crtc: which counter to retrieve |
287 | * | |
57d30230 DV |
288 | * This function is similar to drm_crtc_vblank_count() but this function |
289 | * interpolates to handle a race with vblank interrupts using the high precision | |
290 | * timestamping support. | |
3ed4351a | 291 | * |
57d30230 DV |
292 | * This is mostly useful for hardware that can obtain the scanout position, but |
293 | * doesn't have a hardware frame counter. | |
3ed4351a | 294 | */ |
ca814b25 | 295 | u32 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc) |
3ed4351a DV |
296 | { |
297 | struct drm_device *dev = crtc->dev; | |
298 | unsigned int pipe = drm_crtc_index(crtc); | |
299 | u32 vblank; | |
300 | unsigned long flags; | |
301 | ||
302 | WARN(!dev->driver->get_vblank_timestamp, | |
303 | "This function requires support for accurate vblank timestamps."); | |
304 | ||
305 | spin_lock_irqsave(&dev->vblank_time_lock, flags); | |
306 | ||
307 | drm_update_vblank_count(dev, pipe, false); | |
308 | vblank = drm_vblank_count(dev, pipe); | |
309 | ||
310 | spin_unlock_irqrestore(&dev->vblank_time_lock, flags); | |
311 | ||
312 | return vblank; | |
313 | } | |
ca814b25 | 314 | EXPORT_SYMBOL(drm_crtc_accurate_vblank_count); |
3ed4351a DV |
315 | |
316 | static void __disable_vblank(struct drm_device *dev, unsigned int pipe) | |
317 | { | |
318 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
319 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
320 | ||
321 | if (crtc->funcs->disable_vblank) { | |
322 | crtc->funcs->disable_vblank(crtc); | |
323 | return; | |
324 | } | |
325 | } | |
326 | ||
327 | dev->driver->disable_vblank(dev, pipe); | |
328 | } | |
329 | ||
330 | /* | |
331 | * Disable vblank irq's on crtc, make sure that last vblank count | |
332 | * of hardware and corresponding consistent software vblank counter | |
333 | * are preserved, even if there are any spurious vblank irq's after | |
334 | * disable. | |
335 | */ | |
336 | void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) | |
337 | { | |
338 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
339 | unsigned long irqflags; | |
340 | ||
341 | assert_spin_locked(&dev->vbl_lock); | |
342 | ||
343 | /* Prevent vblank irq processing while disabling vblank irqs, | |
344 | * so no updates of timestamps or count can happen after we've | |
345 | * disabled. Needed to prevent races in case of delayed irq's. | |
346 | */ | |
347 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
348 | ||
349 | /* | |
350 | * Only disable vblank interrupts if they're enabled. This avoids | |
351 | * calling the ->disable_vblank() operation in atomic context with the | |
352 | * hardware potentially runtime suspended. | |
353 | */ | |
354 | if (vblank->enabled) { | |
355 | __disable_vblank(dev, pipe); | |
356 | vblank->enabled = false; | |
357 | } | |
358 | ||
359 | /* | |
360 | * Always update the count and timestamp to maintain the | |
361 | * appearance that the counter has been ticking all along until | |
362 | * this time. This makes the count account for the entire time | |
363 | * between drm_crtc_vblank_on() and drm_crtc_vblank_off(). | |
364 | */ | |
365 | drm_update_vblank_count(dev, pipe, false); | |
366 | ||
367 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
368 | } | |
369 | ||
370 | static void vblank_disable_fn(unsigned long arg) | |
371 | { | |
372 | struct drm_vblank_crtc *vblank = (void *)arg; | |
373 | struct drm_device *dev = vblank->dev; | |
374 | unsigned int pipe = vblank->pipe; | |
375 | unsigned long irqflags; | |
376 | ||
377 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
378 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
379 | DRM_DEBUG("disabling vblank on crtc %u\n", pipe); | |
380 | drm_vblank_disable_and_save(dev, pipe); | |
381 | } | |
382 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
383 | } | |
384 | ||
3ed4351a DV |
385 | void drm_vblank_cleanup(struct drm_device *dev) |
386 | { | |
387 | unsigned int pipe; | |
388 | ||
389 | /* Bail if the driver didn't call drm_vblank_init() */ | |
390 | if (dev->num_crtcs == 0) | |
391 | return; | |
392 | ||
393 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { | |
394 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
395 | ||
396 | WARN_ON(READ_ONCE(vblank->enabled) && | |
397 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
398 | ||
399 | del_timer_sync(&vblank->disable_timer); | |
400 | } | |
401 | ||
402 | kfree(dev->vblank); | |
403 | ||
404 | dev->num_crtcs = 0; | |
405 | } | |
3ed4351a DV |
406 | |
407 | /** | |
408 | * drm_vblank_init - initialize vblank support | |
409 | * @dev: DRM device | |
410 | * @num_crtcs: number of CRTCs supported by @dev | |
411 | * | |
412 | * This function initializes vblank support for @num_crtcs display pipelines. | |
b4164d66 DV |
413 | * Cleanup is handled by the DRM core, or through calling drm_dev_fini() for |
414 | * drivers with a &drm_driver.release callback. | |
3ed4351a DV |
415 | * |
416 | * Returns: | |
417 | * Zero on success or a negative error code on failure. | |
418 | */ | |
419 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) | |
420 | { | |
421 | int ret = -ENOMEM; | |
422 | unsigned int i; | |
423 | ||
424 | spin_lock_init(&dev->vbl_lock); | |
425 | spin_lock_init(&dev->vblank_time_lock); | |
426 | ||
427 | dev->num_crtcs = num_crtcs; | |
428 | ||
429 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); | |
430 | if (!dev->vblank) | |
431 | goto err; | |
432 | ||
433 | for (i = 0; i < num_crtcs; i++) { | |
434 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; | |
435 | ||
436 | vblank->dev = dev; | |
437 | vblank->pipe = i; | |
438 | init_waitqueue_head(&vblank->queue); | |
439 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
440 | (unsigned long)vblank); | |
441 | seqlock_init(&vblank->seqlock); | |
442 | } | |
443 | ||
444 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); | |
445 | ||
446 | /* Driver specific high-precision vblank timestamping supported? */ | |
447 | if (dev->driver->get_vblank_timestamp) | |
448 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
449 | else | |
450 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
451 | ||
452 | /* Must have precise timestamping for reliable vblank instant disable */ | |
453 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
454 | dev->vblank_disable_immediate = false; | |
455 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
456 | "get_vblank_timestamp == NULL\n"); | |
457 | } | |
458 | ||
459 | return 0; | |
460 | ||
461 | err: | |
462 | dev->num_crtcs = 0; | |
463 | return ret; | |
464 | } | |
465 | EXPORT_SYMBOL(drm_vblank_init); | |
466 | ||
467 | /** | |
468 | * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC | |
469 | * @crtc: which CRTC's vblank waitqueue to retrieve | |
470 | * | |
471 | * This function returns a pointer to the vblank waitqueue for the CRTC. | |
472 | * Drivers can use this to implement vblank waits using wait_event() and related | |
473 | * functions. | |
474 | */ | |
475 | wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc) | |
476 | { | |
477 | return &crtc->dev->vblank[drm_crtc_index(crtc)].queue; | |
478 | } | |
479 | EXPORT_SYMBOL(drm_crtc_vblank_waitqueue); | |
480 | ||
481 | ||
482 | /** | |
483 | * drm_calc_timestamping_constants - calculate vblank timestamp constants | |
484 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
485 | * @mode: display mode containing the scanout timings | |
486 | * | |
57d30230 DV |
487 | * Calculate and store various constants which are later needed by vblank and |
488 | * swap-completion timestamping, e.g, by | |
489 | * drm_calc_vbltimestamp_from_scanoutpos(). They are derived from CRTC's true | |
490 | * scanout timing, so they take things like panel scaling or other adjustments | |
491 | * into account. | |
3ed4351a DV |
492 | */ |
493 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, | |
494 | const struct drm_display_mode *mode) | |
495 | { | |
496 | struct drm_device *dev = crtc->dev; | |
497 | unsigned int pipe = drm_crtc_index(crtc); | |
498 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
499 | int linedur_ns = 0, framedur_ns = 0; | |
500 | int dotclock = mode->crtc_clock; | |
501 | ||
502 | if (!dev->num_crtcs) | |
503 | return; | |
504 | ||
505 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
506 | return; | |
507 | ||
508 | /* Valid dotclock? */ | |
509 | if (dotclock > 0) { | |
510 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; | |
511 | ||
512 | /* | |
513 | * Convert scanline length in pixels and video | |
514 | * dot clock to line duration and frame duration | |
515 | * in nanoseconds: | |
516 | */ | |
517 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
518 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
519 | ||
520 | /* | |
521 | * Fields of interlaced scanout modes are only half a frame duration. | |
522 | */ | |
523 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
524 | framedur_ns /= 2; | |
525 | } else | |
526 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", | |
527 | crtc->base.id); | |
528 | ||
529 | vblank->linedur_ns = linedur_ns; | |
530 | vblank->framedur_ns = framedur_ns; | |
531 | vblank->hwmode = *mode; | |
532 | ||
533 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
534 | crtc->base.id, mode->crtc_htotal, | |
535 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
536 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n", | |
537 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
538 | } | |
539 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
540 | ||
541 | /** | |
542 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper | |
543 | * @dev: DRM device | |
544 | * @pipe: index of CRTC whose vblank timestamp to retrieve | |
545 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
546 | * On return contains true maximum error of timestamp | |
67680d3c | 547 | * @vblank_time: Pointer to time which should receive the timestamp |
3ed4351a DV |
548 | * @in_vblank_irq: |
549 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
550 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
551 | * if flag is set. | |
552 | * | |
553 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
57d30230 DV |
554 | * timings and current video scanout position of a CRTC. This can be directly |
555 | * used as the &drm_driver.get_vblank_timestamp implementation of a kms driver | |
556 | * if &drm_driver.get_scanout_position is implemented. | |
3ed4351a | 557 | * |
57d30230 DV |
558 | * The current implementation only handles standard video modes. For double scan |
559 | * and interlaced modes the driver is supposed to adjust the hardware mode | |
560 | * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to | |
561 | * match the scanout position reported. | |
3ed4351a DV |
562 | * |
563 | * Note that atomic drivers must call drm_calc_timestamping_constants() before | |
564 | * enabling a CRTC. The atomic helpers already take care of that in | |
565 | * drm_atomic_helper_update_legacy_modeset_state(). | |
566 | * | |
567 | * Returns: | |
568 | * | |
569 | * Returns true on success, and false on failure, i.e. when no accurate | |
570 | * timestamp could be acquired. | |
571 | */ | |
572 | bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, | |
573 | unsigned int pipe, | |
574 | int *max_error, | |
67680d3c | 575 | ktime_t *vblank_time, |
3ed4351a DV |
576 | bool in_vblank_irq) |
577 | { | |
67680d3c | 578 | struct timespec64 ts_etime, ts_vblank_time; |
3ed4351a DV |
579 | ktime_t stime, etime; |
580 | bool vbl_status; | |
581 | struct drm_crtc *crtc; | |
582 | const struct drm_display_mode *mode; | |
583 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
584 | int vpos, hpos, i; | |
585 | int delta_ns, duration_ns; | |
586 | ||
587 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
588 | return false; | |
589 | ||
590 | crtc = drm_crtc_from_index(dev, pipe); | |
591 | ||
592 | if (pipe >= dev->num_crtcs || !crtc) { | |
593 | DRM_ERROR("Invalid crtc %u\n", pipe); | |
594 | return false; | |
595 | } | |
596 | ||
597 | /* Scanout position query not supported? Should not happen. */ | |
598 | if (!dev->driver->get_scanout_position) { | |
599 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
600 | return false; | |
601 | } | |
602 | ||
603 | if (drm_drv_uses_atomic_modeset(dev)) | |
604 | mode = &vblank->hwmode; | |
605 | else | |
606 | mode = &crtc->hwmode; | |
607 | ||
608 | /* If mode timing undefined, just return as no-op: | |
609 | * Happens during initial modesetting of a crtc. | |
610 | */ | |
611 | if (mode->crtc_clock == 0) { | |
612 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); | |
613 | WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev)); | |
614 | ||
615 | return false; | |
616 | } | |
617 | ||
618 | /* Get current scanout position with system timestamp. | |
619 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
620 | * if single query takes longer than max_error nanoseconds. | |
621 | * | |
622 | * This guarantees a tight bound on maximum error if | |
623 | * code gets preempted or delayed for some reason. | |
624 | */ | |
625 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
626 | /* | |
627 | * Get vertical and horizontal scanout position vpos, hpos, | |
628 | * and bounding timestamps stime, etime, pre/post query. | |
629 | */ | |
630 | vbl_status = dev->driver->get_scanout_position(dev, pipe, | |
631 | in_vblank_irq, | |
632 | &vpos, &hpos, | |
633 | &stime, &etime, | |
634 | mode); | |
635 | ||
636 | /* Return as no-op if scanout query unsupported or failed. */ | |
637 | if (!vbl_status) { | |
638 | DRM_DEBUG("crtc %u : scanoutpos query failed.\n", | |
639 | pipe); | |
640 | return false; | |
641 | } | |
642 | ||
643 | /* Compute uncertainty in timestamp of scanout position query. */ | |
644 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); | |
645 | ||
646 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
647 | if (duration_ns <= *max_error) | |
648 | break; | |
649 | } | |
650 | ||
651 | /* Noisy system timing? */ | |
652 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
653 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", | |
654 | pipe, duration_ns/1000, *max_error/1000, i); | |
655 | } | |
656 | ||
657 | /* Return upper bound of timestamp precision error. */ | |
658 | *max_error = duration_ns; | |
659 | ||
660 | /* Convert scanout position into elapsed time at raw_time query | |
661 | * since start of scanout at first display scanline. delta_ns | |
662 | * can be negative if start of scanout hasn't happened yet. | |
663 | */ | |
664 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), | |
665 | mode->crtc_clock); | |
666 | ||
3ed4351a | 667 | /* save this only for debugging purposes */ |
67680d3c AB |
668 | ts_etime = ktime_to_timespec64(etime); |
669 | ts_vblank_time = ktime_to_timespec64(*vblank_time); | |
3ed4351a DV |
670 | /* Subtract time delta from raw timestamp to get final |
671 | * vblank_time timestamp for end of vblank. | |
672 | */ | |
673 | etime = ktime_sub_ns(etime, delta_ns); | |
67680d3c | 674 | *vblank_time = etime; |
3ed4351a | 675 | |
67680d3c | 676 | DRM_DEBUG_VBL("crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n", |
3ed4351a | 677 | pipe, hpos, vpos, |
67680d3c AB |
678 | (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000, |
679 | (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, | |
680 | duration_ns / 1000, i); | |
3ed4351a DV |
681 | |
682 | return true; | |
683 | } | |
684 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
685 | ||
3ed4351a DV |
686 | /** |
687 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
688 | * vblank interval | |
689 | * @dev: DRM device | |
690 | * @pipe: index of CRTC whose vblank timestamp to retrieve | |
67680d3c | 691 | * @tvblank: Pointer to target time which should receive the timestamp |
3ed4351a DV |
692 | * @in_vblank_irq: |
693 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
694 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
695 | * if flag is set. | |
696 | * | |
697 | * Fetches the system timestamp corresponding to the time of the most recent | |
698 | * vblank interval on specified CRTC. May call into kms-driver to | |
699 | * compute the timestamp with a high-precision GPU specific method. | |
700 | * | |
701 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
702 | * call, i.e., it isn't very precisely locked to the true vblank. | |
703 | * | |
704 | * Returns: | |
705 | * True if timestamp is considered to be very precise, false otherwise. | |
706 | */ | |
707 | static bool | |
708 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 709 | ktime_t *tvblank, bool in_vblank_irq) |
3ed4351a DV |
710 | { |
711 | bool ret = false; | |
712 | ||
713 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
714 | int max_error = (int) drm_timestamp_precision * 1000; | |
715 | ||
716 | /* Query driver if possible and precision timestamping enabled. */ | |
717 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) | |
718 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, | |
719 | tvblank, in_vblank_irq); | |
720 | ||
721 | /* GPU high precision timestamp query unsupported or failed. | |
722 | * Return current monotonic/gettimeofday timestamp as best estimate. | |
723 | */ | |
724 | if (!ret) | |
25e1a798 | 725 | *tvblank = ktime_get(); |
3ed4351a DV |
726 | |
727 | return ret; | |
728 | } | |
729 | ||
730 | /** | |
731 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
732 | * @crtc: which counter to retrieve | |
733 | * | |
734 | * Fetches the "cooked" vblank count value that represents the number of | |
735 | * vblank events since the system was booted, including lost events due to | |
57d30230 DV |
736 | * modesetting activity. Note that this timer isn't correct against a racing |
737 | * vblank interrupt (since it only reports the software vblank counter), see | |
ca814b25 | 738 | * drm_crtc_accurate_vblank_count() for such use-cases. |
3ed4351a DV |
739 | * |
740 | * Returns: | |
741 | * The software vblank counter. | |
742 | */ | |
570e8696 | 743 | u64 drm_crtc_vblank_count(struct drm_crtc *crtc) |
3ed4351a DV |
744 | { |
745 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
746 | } | |
747 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
748 | ||
570e8696 KP |
749 | /** |
750 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the | |
751 | * system timestamp corresponding to that vblank counter value. | |
752 | * @dev: DRM device | |
753 | * @pipe: index of CRTC whose counter to retrieve | |
754 | * @vblanktime: Pointer to ktime_t to receive the vblank timestamp. | |
755 | * | |
756 | * Fetches the "cooked" vblank count value that represents the number of | |
757 | * vblank events since the system was booted, including lost events due to | |
758 | * modesetting activity. Returns corresponding system timestamp of the time | |
759 | * of the vblank interval that corresponds to the current vblank counter value. | |
760 | * | |
761 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
762 | */ | |
763 | static u64 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 764 | ktime_t *vblanktime) |
3ed4351a DV |
765 | { |
766 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
570e8696 | 767 | u64 vblank_count; |
3ed4351a DV |
768 | unsigned int seq; |
769 | ||
770 | if (WARN_ON(pipe >= dev->num_crtcs)) { | |
67680d3c | 771 | *vblanktime = 0; |
3ed4351a DV |
772 | return 0; |
773 | } | |
774 | ||
775 | do { | |
776 | seq = read_seqbegin(&vblank->seqlock); | |
777 | vblank_count = vblank->count; | |
778 | *vblanktime = vblank->time; | |
779 | } while (read_seqretry(&vblank->seqlock, seq)); | |
780 | ||
781 | return vblank_count; | |
782 | } | |
783 | ||
784 | /** | |
785 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
786 | * and the system timestamp corresponding to that vblank counter value | |
787 | * @crtc: which counter to retrieve | |
67680d3c | 788 | * @vblanktime: Pointer to time to receive the vblank timestamp. |
3ed4351a DV |
789 | * |
790 | * Fetches the "cooked" vblank count value that represents the number of | |
791 | * vblank events since the system was booted, including lost events due to | |
792 | * modesetting activity. Returns corresponding system timestamp of the time | |
793 | * of the vblank interval that corresponds to the current vblank counter value. | |
794 | */ | |
570e8696 | 795 | u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, |
67680d3c | 796 | ktime_t *vblanktime) |
3ed4351a DV |
797 | { |
798 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
799 | vblanktime); | |
800 | } | |
801 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
802 | ||
803 | static void send_vblank_event(struct drm_device *dev, | |
804 | struct drm_pending_vblank_event *e, | |
570e8696 | 805 | u64 seq, ktime_t now) |
3ed4351a | 806 | { |
67680d3c AB |
807 | struct timespec64 tv = ktime_to_timespec64(now); |
808 | ||
3ed4351a | 809 | e->event.sequence = seq; |
67680d3c AB |
810 | /* |
811 | * e->event is a user space structure, with hardcoded unsigned | |
25e1a798 AB |
812 | * 32-bit seconds/microseconds. This is safe as we always use |
813 | * monotonic timestamps since linux-4.15 | |
67680d3c AB |
814 | */ |
815 | e->event.tv_sec = tv.tv_sec; | |
816 | e->event.tv_usec = tv.tv_nsec / 1000; | |
3ed4351a DV |
817 | |
818 | trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, | |
819 | e->event.sequence); | |
820 | ||
821 | drm_send_event_locked(dev, &e->base); | |
822 | } | |
823 | ||
824 | /** | |
825 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip | |
826 | * @crtc: the source CRTC of the vblank event | |
827 | * @e: the event to send | |
828 | * | |
829 | * A lot of drivers need to generate vblank events for the very next vblank | |
830 | * interrupt. For example when the page flip interrupt happens when the page | |
831 | * flip gets armed, but not when it actually executes within the next vblank | |
832 | * period. This helper function implements exactly the required vblank arming | |
833 | * behaviour. | |
834 | * | |
835 | * NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an | |
836 | * atomic commit must ensure that the next vblank happens at exactly the same | |
837 | * time as the atomic commit is committed to the hardware. This function itself | |
e13a0583 | 838 | * does **not** protect against the next vblank interrupt racing with either this |
3ed4351a DV |
839 | * function call or the atomic commit operation. A possible sequence could be: |
840 | * | |
841 | * 1. Driver commits new hardware state into vblank-synchronized registers. | |
842 | * 2. A vblank happens, committing the hardware state. Also the corresponding | |
843 | * vblank interrupt is fired off and fully processed by the interrupt | |
844 | * handler. | |
845 | * 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event(). | |
846 | * 4. The event is only send out for the next vblank, which is wrong. | |
847 | * | |
848 | * An equivalent race can happen when the driver calls | |
849 | * drm_crtc_arm_vblank_event() before writing out the new hardware state. | |
850 | * | |
851 | * The only way to make this work safely is to prevent the vblank from firing | |
852 | * (and the hardware from committing anything else) until the entire atomic | |
853 | * commit sequence has run to completion. If the hardware does not have such a | |
854 | * feature (e.g. using a "go" bit), then it is unsafe to use this functions. | |
855 | * Instead drivers need to manually send out the event from their interrupt | |
856 | * handler by calling drm_crtc_send_vblank_event() and make sure that there's no | |
857 | * possible race with the hardware committing the atomic update. | |
858 | * | |
57d30230 DV |
859 | * Caller must hold a vblank reference for the event @e, which will be dropped |
860 | * when the next vblank arrives. | |
3ed4351a DV |
861 | */ |
862 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, | |
863 | struct drm_pending_vblank_event *e) | |
864 | { | |
865 | struct drm_device *dev = crtc->dev; | |
866 | unsigned int pipe = drm_crtc_index(crtc); | |
867 | ||
868 | assert_spin_locked(&dev->event_lock); | |
869 | ||
870 | e->pipe = pipe; | |
570e8696 | 871 | e->sequence = drm_crtc_accurate_vblank_count(crtc) + 1; |
3ed4351a DV |
872 | e->event.crtc_id = crtc->base.id; |
873 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
874 | } | |
875 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); | |
876 | ||
877 | /** | |
878 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
879 | * @crtc: the source CRTC of the vblank event | |
880 | * @e: the event to send | |
881 | * | |
882 | * Updates sequence # and timestamp on event for the most recently processed | |
883 | * vblank, and sends it to userspace. Caller must hold event lock. | |
884 | * | |
885 | * See drm_crtc_arm_vblank_event() for a helper which can be used in certain | |
886 | * situation, especially to send out events for atomic commit operations. | |
887 | */ | |
888 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
889 | struct drm_pending_vblank_event *e) | |
890 | { | |
891 | struct drm_device *dev = crtc->dev; | |
570e8696 KP |
892 | u64 seq; |
893 | unsigned int pipe = drm_crtc_index(crtc); | |
67680d3c | 894 | ktime_t now; |
3ed4351a DV |
895 | |
896 | if (dev->num_crtcs > 0) { | |
897 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
898 | } else { | |
899 | seq = 0; | |
900 | ||
25e1a798 | 901 | now = ktime_get(); |
3ed4351a DV |
902 | } |
903 | e->pipe = pipe; | |
904 | e->event.crtc_id = crtc->base.id; | |
67680d3c | 905 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
906 | } |
907 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
908 | ||
909 | static int __enable_vblank(struct drm_device *dev, unsigned int pipe) | |
910 | { | |
911 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
912 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
913 | ||
914 | if (crtc->funcs->enable_vblank) | |
915 | return crtc->funcs->enable_vblank(crtc); | |
916 | } | |
917 | ||
918 | return dev->driver->enable_vblank(dev, pipe); | |
919 | } | |
920 | ||
3ed4351a DV |
921 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
922 | { | |
923 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
924 | int ret = 0; | |
925 | ||
926 | assert_spin_locked(&dev->vbl_lock); | |
927 | ||
928 | spin_lock(&dev->vblank_time_lock); | |
929 | ||
930 | if (!vblank->enabled) { | |
931 | /* | |
932 | * Enable vblank irqs under vblank_time_lock protection. | |
933 | * All vblank count & timestamp updates are held off | |
934 | * until we are done reinitializing master counter and | |
935 | * timestamps. Filtercode in drm_handle_vblank() will | |
936 | * prevent double-accounting of same vblank interval. | |
937 | */ | |
938 | ret = __enable_vblank(dev, pipe); | |
939 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); | |
940 | if (ret) { | |
941 | atomic_dec(&vblank->refcount); | |
942 | } else { | |
943 | drm_update_vblank_count(dev, pipe, 0); | |
944 | /* drm_update_vblank_count() includes a wmb so we just | |
945 | * need to ensure that the compiler emits the write | |
946 | * to mark the vblank as enabled after the call | |
947 | * to drm_update_vblank_count(). | |
948 | */ | |
949 | WRITE_ONCE(vblank->enabled, true); | |
950 | } | |
951 | } | |
952 | ||
953 | spin_unlock(&dev->vblank_time_lock); | |
954 | ||
955 | return ret; | |
956 | } | |
957 | ||
3ed4351a DV |
958 | static int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
959 | { | |
960 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
961 | unsigned long irqflags; | |
962 | int ret = 0; | |
963 | ||
964 | if (!dev->num_crtcs) | |
965 | return -EINVAL; | |
966 | ||
967 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
968 | return -EINVAL; | |
969 | ||
970 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
971 | /* Going from 0->1 means we have to enable interrupts again */ | |
972 | if (atomic_add_return(1, &vblank->refcount) == 1) { | |
973 | ret = drm_vblank_enable(dev, pipe); | |
974 | } else { | |
975 | if (!vblank->enabled) { | |
976 | atomic_dec(&vblank->refcount); | |
977 | ret = -EINVAL; | |
978 | } | |
979 | } | |
980 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
981 | ||
982 | return ret; | |
983 | } | |
984 | ||
985 | /** | |
986 | * drm_crtc_vblank_get - get a reference count on vblank events | |
987 | * @crtc: which CRTC to own | |
988 | * | |
989 | * Acquire a reference count on vblank events to avoid having them disabled | |
990 | * while in use. | |
991 | * | |
992 | * Returns: | |
993 | * Zero on success or a negative error code on failure. | |
994 | */ | |
995 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
996 | { | |
997 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
998 | } | |
999 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1000 | ||
3ed4351a DV |
1001 | static void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
1002 | { | |
1003 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1004 | ||
1005 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1006 | return; | |
1007 | ||
1008 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) | |
1009 | return; | |
1010 | ||
1011 | /* Last user schedules interrupt disable */ | |
1012 | if (atomic_dec_and_test(&vblank->refcount)) { | |
1013 | if (drm_vblank_offdelay == 0) | |
1014 | return; | |
1015 | else if (drm_vblank_offdelay < 0) | |
1016 | vblank_disable_fn((unsigned long)vblank); | |
1017 | else if (!dev->vblank_disable_immediate) | |
1018 | mod_timer(&vblank->disable_timer, | |
1019 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1020 | } | |
1021 | } | |
1022 | ||
1023 | /** | |
1024 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1025 | * @crtc: which counter to give up | |
1026 | * | |
1027 | * Release ownership of a given vblank counter, turning off interrupts | |
1028 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1029 | */ | |
1030 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1031 | { | |
1032 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1033 | } | |
1034 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1035 | ||
1036 | /** | |
1037 | * drm_wait_one_vblank - wait for one vblank | |
1038 | * @dev: DRM device | |
1039 | * @pipe: CRTC index | |
1040 | * | |
1041 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. | |
1042 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
1043 | * due to lack of driver support or because the crtc is off. | |
57d30230 DV |
1044 | * |
1045 | * This is the legacy version of drm_crtc_wait_one_vblank(). | |
3ed4351a DV |
1046 | */ |
1047 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) | |
1048 | { | |
1049 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1050 | int ret; | |
1051 | u32 last; | |
1052 | ||
1053 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1054 | return; | |
1055 | ||
1056 | ret = drm_vblank_get(dev, pipe); | |
1057 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |
1058 | return; | |
1059 | ||
1060 | last = drm_vblank_count(dev, pipe); | |
1061 | ||
1062 | ret = wait_event_timeout(vblank->queue, | |
1063 | last != drm_vblank_count(dev, pipe), | |
1064 | msecs_to_jiffies(100)); | |
1065 | ||
1066 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); | |
1067 | ||
1068 | drm_vblank_put(dev, pipe); | |
1069 | } | |
1070 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1071 | ||
1072 | /** | |
1073 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1074 | * @crtc: DRM crtc | |
1075 | * | |
1076 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1077 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1078 | * due to lack of driver support or because the crtc is off. | |
1079 | */ | |
1080 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1081 | { | |
1082 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1083 | } | |
1084 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1085 | ||
1086 | /** | |
1087 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1088 | * @crtc: CRTC in question | |
1089 | * | |
1090 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1091 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1092 | * stored so that drm_vblank_on can restore it again. | |
1093 | * | |
1094 | * Drivers must use this function when the hardware vblank counter can get | |
57d30230 | 1095 | * reset, e.g. when suspending or disabling the @crtc in general. |
3ed4351a DV |
1096 | */ |
1097 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1098 | { | |
1099 | struct drm_device *dev = crtc->dev; | |
1100 | unsigned int pipe = drm_crtc_index(crtc); | |
1101 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1102 | struct drm_pending_vblank_event *e, *t; | |
67680d3c AB |
1103 | |
1104 | ktime_t now; | |
3ed4351a | 1105 | unsigned long irqflags; |
570e8696 | 1106 | u64 seq; |
3ed4351a DV |
1107 | |
1108 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1109 | return; | |
1110 | ||
1111 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1112 | ||
1113 | spin_lock(&dev->vbl_lock); | |
1114 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", | |
1115 | pipe, vblank->enabled, vblank->inmodeset); | |
1116 | ||
1117 | /* Avoid redundant vblank disables without previous | |
1118 | * drm_crtc_vblank_on(). */ | |
1119 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) | |
1120 | drm_vblank_disable_and_save(dev, pipe); | |
1121 | ||
1122 | wake_up(&vblank->queue); | |
1123 | ||
1124 | /* | |
1125 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1126 | * the vblank interrupt by bumping the refcount. | |
1127 | */ | |
1128 | if (!vblank->inmodeset) { | |
1129 | atomic_inc(&vblank->refcount); | |
1130 | vblank->inmodeset = 1; | |
1131 | } | |
1132 | spin_unlock(&dev->vbl_lock); | |
1133 | ||
1134 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
1135 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1136 | ||
1137 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1138 | if (e->pipe != pipe) | |
1139 | continue; | |
1140 | DRM_DEBUG("Sending premature vblank event on disable: " | |
570e8696 KP |
1141 | "wanted %llu, current %llu\n", |
1142 | e->sequence, seq); | |
3ed4351a DV |
1143 | list_del(&e->base.link); |
1144 | drm_vblank_put(dev, pipe); | |
67680d3c | 1145 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1146 | } |
1147 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1148 | ||
1149 | /* Will be reset by the modeset helpers when re-enabling the crtc by | |
1150 | * calling drm_calc_timestamping_constants(). */ | |
1151 | vblank->hwmode.crtc_clock = 0; | |
1152 | } | |
1153 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1154 | ||
1155 | /** | |
1156 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
1157 | * @crtc: CRTC in question | |
1158 | * | |
1159 | * Drivers can use this function to reset the vblank state to off at load time. | |
1160 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1161 | * drm_crtc_vblank_on() functions. The difference compared to | |
1162 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1163 | * and hence doesn't need to call any driver hooks. | |
57d30230 DV |
1164 | * |
1165 | * This is useful for recovering driver state e.g. on driver load, or on resume. | |
3ed4351a DV |
1166 | */ |
1167 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) | |
1168 | { | |
1169 | struct drm_device *dev = crtc->dev; | |
1170 | unsigned long irqflags; | |
1171 | unsigned int pipe = drm_crtc_index(crtc); | |
1172 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1173 | ||
1174 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1175 | /* | |
1176 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1177 | * interrupt by bumping the refcount. | |
1178 | */ | |
1179 | if (!vblank->inmodeset) { | |
1180 | atomic_inc(&vblank->refcount); | |
1181 | vblank->inmodeset = 1; | |
1182 | } | |
1183 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1184 | ||
1185 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1186 | } | |
1187 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1188 | ||
1189 | /** | |
1190 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1191 | * @crtc: CRTC in question | |
1192 | * | |
1193 | * This functions restores the vblank interrupt state captured with | |
57d30230 DV |
1194 | * drm_crtc_vblank_off() again and is generally called when enabling @crtc. Note |
1195 | * that calls to drm_crtc_vblank_on() and drm_crtc_vblank_off() can be | |
1196 | * unbalanced and so can also be unconditionally called in driver load code to | |
1197 | * reflect the current hardware state of the crtc. | |
3ed4351a DV |
1198 | */ |
1199 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1200 | { | |
1201 | struct drm_device *dev = crtc->dev; | |
1202 | unsigned int pipe = drm_crtc_index(crtc); | |
1203 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1204 | unsigned long irqflags; | |
1205 | ||
1206 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1207 | return; | |
1208 | ||
1209 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1210 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", | |
1211 | pipe, vblank->enabled, vblank->inmodeset); | |
1212 | ||
1213 | /* Drop our private "prevent drm_vblank_get" refcount */ | |
1214 | if (vblank->inmodeset) { | |
1215 | atomic_dec(&vblank->refcount); | |
1216 | vblank->inmodeset = 0; | |
1217 | } | |
1218 | ||
1219 | drm_reset_vblank_timestamp(dev, pipe); | |
1220 | ||
1221 | /* | |
1222 | * re-enable interrupts if there are users left, or the | |
1223 | * user wishes vblank interrupts to be enabled all the time. | |
1224 | */ | |
1225 | if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) | |
1226 | WARN_ON(drm_vblank_enable(dev, pipe)); | |
1227 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1228 | } | |
1229 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1230 | ||
1231 | static void drm_legacy_vblank_pre_modeset(struct drm_device *dev, | |
1232 | unsigned int pipe) | |
1233 | { | |
1234 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1235 | ||
1236 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
1237 | if (!dev->num_crtcs) | |
1238 | return; | |
1239 | ||
1240 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1241 | return; | |
1242 | ||
1243 | /* | |
1244 | * To avoid all the problems that might happen if interrupts | |
1245 | * were enabled/disabled around or between these calls, we just | |
1246 | * have the kernel take a reference on the CRTC (just once though | |
1247 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1248 | * so that interrupts remain enabled in the interim. | |
1249 | */ | |
1250 | if (!vblank->inmodeset) { | |
1251 | vblank->inmodeset = 0x1; | |
1252 | if (drm_vblank_get(dev, pipe) == 0) | |
1253 | vblank->inmodeset |= 0x2; | |
1254 | } | |
1255 | } | |
1256 | ||
1257 | static void drm_legacy_vblank_post_modeset(struct drm_device *dev, | |
1258 | unsigned int pipe) | |
1259 | { | |
1260 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1261 | unsigned long irqflags; | |
1262 | ||
1263 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
1264 | if (!dev->num_crtcs) | |
1265 | return; | |
1266 | ||
1267 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1268 | return; | |
1269 | ||
1270 | if (vblank->inmodeset) { | |
1271 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1272 | drm_reset_vblank_timestamp(dev, pipe); | |
1273 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1274 | ||
1275 | if (vblank->inmodeset & 0x2) | |
1276 | drm_vblank_put(dev, pipe); | |
1277 | ||
1278 | vblank->inmodeset = 0; | |
1279 | } | |
1280 | } | |
1281 | ||
b6dcaaac DV |
1282 | int drm_legacy_modeset_ctl_ioctl(struct drm_device *dev, void *data, |
1283 | struct drm_file *file_priv) | |
3ed4351a DV |
1284 | { |
1285 | struct drm_modeset_ctl *modeset = data; | |
1286 | unsigned int pipe; | |
1287 | ||
1288 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1289 | if (!dev->num_crtcs) | |
1290 | return 0; | |
1291 | ||
1292 | /* KMS drivers handle this internally */ | |
1293 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) | |
1294 | return 0; | |
1295 | ||
1296 | pipe = modeset->crtc; | |
1297 | if (pipe >= dev->num_crtcs) | |
1298 | return -EINVAL; | |
1299 | ||
1300 | switch (modeset->cmd) { | |
1301 | case _DRM_PRE_MODESET: | |
1302 | drm_legacy_vblank_pre_modeset(dev, pipe); | |
1303 | break; | |
1304 | case _DRM_POST_MODESET: | |
1305 | drm_legacy_vblank_post_modeset(dev, pipe); | |
1306 | break; | |
1307 | default: | |
1308 | return -EINVAL; | |
1309 | } | |
1310 | ||
1311 | return 0; | |
1312 | } | |
1313 | ||
570e8696 | 1314 | static inline bool vblank_passed(u64 seq, u64 ref) |
3ed4351a DV |
1315 | { |
1316 | return (seq - ref) <= (1 << 23); | |
1317 | } | |
1318 | ||
1319 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, | |
570e8696 | 1320 | u64 req_seq, |
3ed4351a DV |
1321 | union drm_wait_vblank *vblwait, |
1322 | struct drm_file *file_priv) | |
1323 | { | |
1324 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1325 | struct drm_pending_vblank_event *e; | |
67680d3c | 1326 | ktime_t now; |
3ed4351a | 1327 | unsigned long flags; |
570e8696 | 1328 | u64 seq; |
3ed4351a DV |
1329 | int ret; |
1330 | ||
1331 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
1332 | if (e == NULL) { | |
1333 | ret = -ENOMEM; | |
1334 | goto err_put; | |
1335 | } | |
1336 | ||
1337 | e->pipe = pipe; | |
1338 | e->event.base.type = DRM_EVENT_VBLANK; | |
1339 | e->event.base.length = sizeof(e->event); | |
1340 | e->event.user_data = vblwait->request.signal; | |
1341 | ||
1342 | spin_lock_irqsave(&dev->event_lock, flags); | |
1343 | ||
1344 | /* | |
1345 | * drm_crtc_vblank_off() might have been called after we called | |
1346 | * drm_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |
1347 | * vblank disable, so no need for further locking. The reference from | |
1348 | * drm_vblank_get() protects against vblank disable from another source. | |
1349 | */ | |
1350 | if (!READ_ONCE(vblank->enabled)) { | |
1351 | ret = -EINVAL; | |
1352 | goto err_unlock; | |
1353 | } | |
1354 | ||
1355 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |
1356 | &e->event.base); | |
1357 | ||
1358 | if (ret) | |
1359 | goto err_unlock; | |
1360 | ||
1361 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1362 | ||
570e8696 KP |
1363 | DRM_DEBUG("event on vblank count %llu, current %llu, crtc %u\n", |
1364 | req_seq, seq, pipe); | |
3ed4351a | 1365 | |
570e8696 | 1366 | trace_drm_vblank_event_queued(file_priv, pipe, req_seq); |
3ed4351a | 1367 | |
570e8696 KP |
1368 | e->sequence = req_seq; |
1369 | if (vblank_passed(seq, req_seq)) { | |
3ed4351a | 1370 | drm_vblank_put(dev, pipe); |
67680d3c | 1371 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1372 | vblwait->reply.sequence = seq; |
1373 | } else { | |
1374 | /* drm_handle_vblank_events will call drm_vblank_put */ | |
1375 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
570e8696 | 1376 | vblwait->reply.sequence = req_seq; |
3ed4351a DV |
1377 | } |
1378 | ||
1379 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1380 | ||
1381 | return 0; | |
1382 | ||
1383 | err_unlock: | |
1384 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1385 | kfree(e); | |
1386 | err_put: | |
1387 | drm_vblank_put(dev, pipe); | |
1388 | return ret; | |
1389 | } | |
1390 | ||
1391 | static bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait) | |
1392 | { | |
1393 | if (vblwait->request.sequence) | |
1394 | return false; | |
1395 | ||
1396 | return _DRM_VBLANK_RELATIVE == | |
1397 | (vblwait->request.type & (_DRM_VBLANK_TYPES_MASK | | |
1398 | _DRM_VBLANK_EVENT | | |
1399 | _DRM_VBLANK_NEXTONMISS)); | |
1400 | } | |
1401 | ||
570e8696 KP |
1402 | /* |
1403 | * Widen a 32-bit param to 64-bits. | |
1404 | * | |
1405 | * \param narrow 32-bit value (missing upper 32 bits) | |
1406 | * \param near 64-bit value that should be 'close' to near | |
1407 | * | |
1408 | * This function returns a 64-bit value using the lower 32-bits from | |
1409 | * 'narrow' and constructing the upper 32-bits so that the result is | |
1410 | * as close as possible to 'near'. | |
1411 | */ | |
1412 | ||
1413 | static u64 widen_32_to_64(u32 narrow, u64 near) | |
1414 | { | |
1415 | return near + (s32) (narrow - near); | |
1416 | } | |
1417 | ||
67680d3c AB |
1418 | static void drm_wait_vblank_reply(struct drm_device *dev, unsigned int pipe, |
1419 | struct drm_wait_vblank_reply *reply) | |
1420 | { | |
1421 | ktime_t now; | |
1422 | struct timespec64 ts; | |
1423 | ||
1424 | /* | |
1425 | * drm_wait_vblank_reply is a UAPI structure that uses 'long' | |
25e1a798 AB |
1426 | * to store the seconds. This is safe as we always use monotonic |
1427 | * timestamps since linux-4.15. | |
67680d3c AB |
1428 | */ |
1429 | reply->sequence = drm_vblank_count_and_time(dev, pipe, &now); | |
1430 | ts = ktime_to_timespec64(now); | |
1431 | reply->tval_sec = (u32)ts.tv_sec; | |
1432 | reply->tval_usec = ts.tv_nsec / 1000; | |
1433 | } | |
1434 | ||
b6dcaaac DV |
1435 | int drm_wait_vblank_ioctl(struct drm_device *dev, void *data, |
1436 | struct drm_file *file_priv) | |
3ed4351a DV |
1437 | { |
1438 | struct drm_vblank_crtc *vblank; | |
1439 | union drm_wait_vblank *vblwait = data; | |
1440 | int ret; | |
570e8696 KP |
1441 | u64 req_seq, seq; |
1442 | unsigned int flags, pipe, high_pipe; | |
3ed4351a DV |
1443 | |
1444 | if (!dev->irq_enabled) | |
1445 | return -EINVAL; | |
1446 | ||
1447 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) | |
1448 | return -EINVAL; | |
1449 | ||
1450 | if (vblwait->request.type & | |
1451 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1452 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
1453 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", | |
1454 | vblwait->request.type, | |
1455 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1456 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
1457 | return -EINVAL; | |
1458 | } | |
1459 | ||
1460 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; | |
1461 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); | |
1462 | if (high_pipe) | |
1463 | pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1464 | else | |
1465 | pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
1466 | if (pipe >= dev->num_crtcs) | |
1467 | return -EINVAL; | |
1468 | ||
1469 | vblank = &dev->vblank[pipe]; | |
1470 | ||
1471 | /* If the counter is currently enabled and accurate, short-circuit | |
1472 | * queries to return the cached timestamp of the last vblank. | |
1473 | */ | |
1474 | if (dev->vblank_disable_immediate && | |
1475 | drm_wait_vblank_is_query(vblwait) && | |
1476 | READ_ONCE(vblank->enabled)) { | |
67680d3c | 1477 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
3ed4351a DV |
1478 | return 0; |
1479 | } | |
1480 | ||
1481 | ret = drm_vblank_get(dev, pipe); | |
1482 | if (ret) { | |
1483 | DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret); | |
1484 | return ret; | |
1485 | } | |
1486 | seq = drm_vblank_count(dev, pipe); | |
1487 | ||
1488 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { | |
1489 | case _DRM_VBLANK_RELATIVE: | |
570e8696 KP |
1490 | req_seq = seq + vblwait->request.sequence; |
1491 | vblwait->request.sequence = req_seq; | |
3ed4351a | 1492 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; |
570e8696 | 1493 | break; |
3ed4351a | 1494 | case _DRM_VBLANK_ABSOLUTE: |
570e8696 | 1495 | req_seq = widen_32_to_64(vblwait->request.sequence, seq); |
3ed4351a DV |
1496 | break; |
1497 | default: | |
1498 | ret = -EINVAL; | |
1499 | goto done; | |
1500 | } | |
1501 | ||
1502 | if ((flags & _DRM_VBLANK_NEXTONMISS) && | |
570e8696 KP |
1503 | vblank_passed(seq, req_seq)) { |
1504 | req_seq = seq + 1; | |
1505 | vblwait->request.type &= ~_DRM_VBLANK_NEXTONMISS; | |
1506 | vblwait->request.sequence = req_seq; | |
1507 | } | |
3ed4351a DV |
1508 | |
1509 | if (flags & _DRM_VBLANK_EVENT) { | |
1510 | /* must hold on to the vblank ref until the event fires | |
1511 | * drm_vblank_put will be called asynchronously | |
1512 | */ | |
570e8696 | 1513 | return drm_queue_vblank_event(dev, pipe, req_seq, vblwait, file_priv); |
3ed4351a DV |
1514 | } |
1515 | ||
570e8696 KP |
1516 | if (req_seq != seq) { |
1517 | DRM_DEBUG("waiting on vblank count %llu, crtc %u\n", | |
1518 | req_seq, pipe); | |
3ed4351a DV |
1519 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, |
1520 | vblank_passed(drm_vblank_count(dev, pipe), | |
570e8696 | 1521 | req_seq) || |
3ed4351a DV |
1522 | !READ_ONCE(vblank->enabled)); |
1523 | } | |
1524 | ||
1525 | if (ret != -EINTR) { | |
67680d3c | 1526 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
3ed4351a DV |
1527 | |
1528 | DRM_DEBUG("crtc %d returning %u to client\n", | |
1529 | pipe, vblwait->reply.sequence); | |
1530 | } else { | |
1531 | DRM_DEBUG("crtc %d vblank wait interrupted by signal\n", pipe); | |
1532 | } | |
1533 | ||
1534 | done: | |
1535 | drm_vblank_put(dev, pipe); | |
1536 | return ret; | |
1537 | } | |
1538 | ||
1539 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) | |
1540 | { | |
1541 | struct drm_pending_vblank_event *e, *t; | |
67680d3c | 1542 | ktime_t now; |
570e8696 | 1543 | u64 seq; |
3ed4351a DV |
1544 | |
1545 | assert_spin_locked(&dev->event_lock); | |
1546 | ||
1547 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1548 | ||
1549 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1550 | if (e->pipe != pipe) | |
1551 | continue; | |
570e8696 | 1552 | if (!vblank_passed(seq, e->sequence)) |
3ed4351a DV |
1553 | continue; |
1554 | ||
570e8696 KP |
1555 | DRM_DEBUG("vblank event on %llu, current %llu\n", |
1556 | e->sequence, seq); | |
3ed4351a DV |
1557 | |
1558 | list_del(&e->base.link); | |
1559 | drm_vblank_put(dev, pipe); | |
67680d3c | 1560 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1561 | } |
1562 | ||
1563 | trace_drm_vblank_event(pipe, seq); | |
1564 | } | |
1565 | ||
1566 | /** | |
1567 | * drm_handle_vblank - handle a vblank event | |
1568 | * @dev: DRM device | |
1569 | * @pipe: index of CRTC where this event occurred | |
1570 | * | |
1571 | * Drivers should call this routine in their vblank interrupt handlers to | |
1572 | * update the vblank counter and send any signals that may be pending. | |
1573 | * | |
1574 | * This is the legacy version of drm_crtc_handle_vblank(). | |
1575 | */ | |
1576 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) | |
1577 | { | |
1578 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1579 | unsigned long irqflags; | |
1580 | bool disable_irq; | |
1581 | ||
1582 | if (WARN_ON_ONCE(!dev->num_crtcs)) | |
1583 | return false; | |
1584 | ||
1585 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1586 | return false; | |
1587 | ||
1588 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1589 | ||
1590 | /* Need timestamp lock to prevent concurrent execution with | |
1591 | * vblank enable/disable, as this would cause inconsistent | |
1592 | * or corrupted timestamps and vblank counts. | |
1593 | */ | |
1594 | spin_lock(&dev->vblank_time_lock); | |
1595 | ||
1596 | /* Vblank irq handling disabled. Nothing to do. */ | |
1597 | if (!vblank->enabled) { | |
1598 | spin_unlock(&dev->vblank_time_lock); | |
1599 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1600 | return false; | |
1601 | } | |
1602 | ||
1603 | drm_update_vblank_count(dev, pipe, true); | |
1604 | ||
1605 | spin_unlock(&dev->vblank_time_lock); | |
1606 | ||
1607 | wake_up(&vblank->queue); | |
1608 | ||
1609 | /* With instant-off, we defer disabling the interrupt until after | |
1610 | * we finish processing the following vblank after all events have | |
1611 | * been signaled. The disable has to be last (after | |
1612 | * drm_handle_vblank_events) so that the timestamp is always accurate. | |
1613 | */ | |
1614 | disable_irq = (dev->vblank_disable_immediate && | |
1615 | drm_vblank_offdelay > 0 && | |
1616 | !atomic_read(&vblank->refcount)); | |
1617 | ||
1618 | drm_handle_vblank_events(dev, pipe); | |
1619 | ||
1620 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1621 | ||
1622 | if (disable_irq) | |
1623 | vblank_disable_fn((unsigned long)vblank); | |
1624 | ||
1625 | return true; | |
1626 | } | |
1627 | EXPORT_SYMBOL(drm_handle_vblank); | |
1628 | ||
1629 | /** | |
1630 | * drm_crtc_handle_vblank - handle a vblank event | |
1631 | * @crtc: where this event occurred | |
1632 | * | |
1633 | * Drivers should call this routine in their vblank interrupt handlers to | |
1634 | * update the vblank counter and send any signals that may be pending. | |
1635 | * | |
1636 | * This is the native KMS version of drm_handle_vblank(). | |
1637 | * | |
1638 | * Returns: | |
1639 | * True if the event was successfully handled, false on failure. | |
1640 | */ | |
1641 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1642 | { | |
1643 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1644 | } | |
1645 | EXPORT_SYMBOL(drm_crtc_handle_vblank); |