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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 | ||
b3405e59 | 274 | static u64 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
3ed4351a DV |
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 | */ |
b3405e59 | 295 | u64 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); | |
b3405e59 | 299 | u64 vblank; |
3ed4351a DV |
300 | unsigned long flags; |
301 | ||
a111fbc4 VS |
302 | WARN_ONCE(drm_debug & DRM_UT_VBL && !dev->driver->get_vblank_timestamp, |
303 | "This function requires support for accurate vblank timestamps."); | |
3ed4351a DV |
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 | ||
e99e88a9 | 370 | static void vblank_disable_fn(struct timer_list *t) |
3ed4351a | 371 | { |
e99e88a9 | 372 | struct drm_vblank_crtc *vblank = from_timer(vblank, t, disable_timer); |
3ed4351a DV |
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); | |
e99e88a9 | 439 | timer_setup(&vblank->disable_timer, vblank_disable_fn, 0); |
3ed4351a DV |
440 | seqlock_init(&vblank->seqlock); |
441 | } | |
442 | ||
443 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); | |
444 | ||
445 | /* Driver specific high-precision vblank timestamping supported? */ | |
446 | if (dev->driver->get_vblank_timestamp) | |
447 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
448 | else | |
449 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
450 | ||
451 | /* Must have precise timestamping for reliable vblank instant disable */ | |
452 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
453 | dev->vblank_disable_immediate = false; | |
454 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
455 | "get_vblank_timestamp == NULL\n"); | |
456 | } | |
457 | ||
458 | return 0; | |
459 | ||
460 | err: | |
461 | dev->num_crtcs = 0; | |
462 | return ret; | |
463 | } | |
464 | EXPORT_SYMBOL(drm_vblank_init); | |
465 | ||
466 | /** | |
467 | * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC | |
468 | * @crtc: which CRTC's vblank waitqueue to retrieve | |
469 | * | |
470 | * This function returns a pointer to the vblank waitqueue for the CRTC. | |
471 | * Drivers can use this to implement vblank waits using wait_event() and related | |
472 | * functions. | |
473 | */ | |
474 | wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc) | |
475 | { | |
476 | return &crtc->dev->vblank[drm_crtc_index(crtc)].queue; | |
477 | } | |
478 | EXPORT_SYMBOL(drm_crtc_vblank_waitqueue); | |
479 | ||
480 | ||
481 | /** | |
482 | * drm_calc_timestamping_constants - calculate vblank timestamp constants | |
483 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
484 | * @mode: display mode containing the scanout timings | |
485 | * | |
57d30230 DV |
486 | * Calculate and store various constants which are later needed by vblank and |
487 | * swap-completion timestamping, e.g, by | |
488 | * drm_calc_vbltimestamp_from_scanoutpos(). They are derived from CRTC's true | |
489 | * scanout timing, so they take things like panel scaling or other adjustments | |
490 | * into account. | |
3ed4351a DV |
491 | */ |
492 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, | |
493 | const struct drm_display_mode *mode) | |
494 | { | |
495 | struct drm_device *dev = crtc->dev; | |
496 | unsigned int pipe = drm_crtc_index(crtc); | |
497 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
498 | int linedur_ns = 0, framedur_ns = 0; | |
499 | int dotclock = mode->crtc_clock; | |
500 | ||
501 | if (!dev->num_crtcs) | |
502 | return; | |
503 | ||
504 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
505 | return; | |
506 | ||
507 | /* Valid dotclock? */ | |
508 | if (dotclock > 0) { | |
509 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; | |
510 | ||
511 | /* | |
512 | * Convert scanline length in pixels and video | |
513 | * dot clock to line duration and frame duration | |
514 | * in nanoseconds: | |
515 | */ | |
516 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
517 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
518 | ||
519 | /* | |
520 | * Fields of interlaced scanout modes are only half a frame duration. | |
521 | */ | |
522 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
523 | framedur_ns /= 2; | |
524 | } else | |
525 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", | |
526 | crtc->base.id); | |
527 | ||
528 | vblank->linedur_ns = linedur_ns; | |
529 | vblank->framedur_ns = framedur_ns; | |
530 | vblank->hwmode = *mode; | |
531 | ||
532 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
533 | crtc->base.id, mode->crtc_htotal, | |
534 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
535 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n", | |
536 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
537 | } | |
538 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
539 | ||
540 | /** | |
541 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper | |
542 | * @dev: DRM device | |
543 | * @pipe: index of CRTC whose vblank timestamp to retrieve | |
544 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
545 | * On return contains true maximum error of timestamp | |
67680d3c | 546 | * @vblank_time: Pointer to time which should receive the timestamp |
3ed4351a DV |
547 | * @in_vblank_irq: |
548 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
549 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
550 | * if flag is set. | |
551 | * | |
552 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
57d30230 DV |
553 | * timings and current video scanout position of a CRTC. This can be directly |
554 | * used as the &drm_driver.get_vblank_timestamp implementation of a kms driver | |
555 | * if &drm_driver.get_scanout_position is implemented. | |
3ed4351a | 556 | * |
57d30230 DV |
557 | * The current implementation only handles standard video modes. For double scan |
558 | * and interlaced modes the driver is supposed to adjust the hardware mode | |
559 | * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to | |
560 | * match the scanout position reported. | |
3ed4351a DV |
561 | * |
562 | * Note that atomic drivers must call drm_calc_timestamping_constants() before | |
563 | * enabling a CRTC. The atomic helpers already take care of that in | |
564 | * drm_atomic_helper_update_legacy_modeset_state(). | |
565 | * | |
566 | * Returns: | |
567 | * | |
568 | * Returns true on success, and false on failure, i.e. when no accurate | |
569 | * timestamp could be acquired. | |
570 | */ | |
571 | bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, | |
572 | unsigned int pipe, | |
573 | int *max_error, | |
67680d3c | 574 | ktime_t *vblank_time, |
3ed4351a DV |
575 | bool in_vblank_irq) |
576 | { | |
67680d3c | 577 | struct timespec64 ts_etime, ts_vblank_time; |
3ed4351a DV |
578 | ktime_t stime, etime; |
579 | bool vbl_status; | |
580 | struct drm_crtc *crtc; | |
581 | const struct drm_display_mode *mode; | |
582 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
583 | int vpos, hpos, i; | |
584 | int delta_ns, duration_ns; | |
585 | ||
586 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
587 | return false; | |
588 | ||
589 | crtc = drm_crtc_from_index(dev, pipe); | |
590 | ||
591 | if (pipe >= dev->num_crtcs || !crtc) { | |
592 | DRM_ERROR("Invalid crtc %u\n", pipe); | |
593 | return false; | |
594 | } | |
595 | ||
596 | /* Scanout position query not supported? Should not happen. */ | |
597 | if (!dev->driver->get_scanout_position) { | |
598 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
599 | return false; | |
600 | } | |
601 | ||
602 | if (drm_drv_uses_atomic_modeset(dev)) | |
603 | mode = &vblank->hwmode; | |
604 | else | |
605 | mode = &crtc->hwmode; | |
606 | ||
607 | /* If mode timing undefined, just return as no-op: | |
608 | * Happens during initial modesetting of a crtc. | |
609 | */ | |
610 | if (mode->crtc_clock == 0) { | |
611 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); | |
612 | WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev)); | |
613 | ||
614 | return false; | |
615 | } | |
616 | ||
617 | /* Get current scanout position with system timestamp. | |
618 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
619 | * if single query takes longer than max_error nanoseconds. | |
620 | * | |
621 | * This guarantees a tight bound on maximum error if | |
622 | * code gets preempted or delayed for some reason. | |
623 | */ | |
624 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
625 | /* | |
626 | * Get vertical and horizontal scanout position vpos, hpos, | |
627 | * and bounding timestamps stime, etime, pre/post query. | |
628 | */ | |
629 | vbl_status = dev->driver->get_scanout_position(dev, pipe, | |
630 | in_vblank_irq, | |
631 | &vpos, &hpos, | |
632 | &stime, &etime, | |
633 | mode); | |
634 | ||
635 | /* Return as no-op if scanout query unsupported or failed. */ | |
636 | if (!vbl_status) { | |
637 | DRM_DEBUG("crtc %u : scanoutpos query failed.\n", | |
638 | pipe); | |
639 | return false; | |
640 | } | |
641 | ||
642 | /* Compute uncertainty in timestamp of scanout position query. */ | |
643 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); | |
644 | ||
645 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
646 | if (duration_ns <= *max_error) | |
647 | break; | |
648 | } | |
649 | ||
650 | /* Noisy system timing? */ | |
651 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
652 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", | |
653 | pipe, duration_ns/1000, *max_error/1000, i); | |
654 | } | |
655 | ||
656 | /* Return upper bound of timestamp precision error. */ | |
657 | *max_error = duration_ns; | |
658 | ||
659 | /* Convert scanout position into elapsed time at raw_time query | |
660 | * since start of scanout at first display scanline. delta_ns | |
661 | * can be negative if start of scanout hasn't happened yet. | |
662 | */ | |
663 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), | |
664 | mode->crtc_clock); | |
665 | ||
3ed4351a DV |
666 | /* Subtract time delta from raw timestamp to get final |
667 | * vblank_time timestamp for end of vblank. | |
668 | */ | |
18b3e2d4 VS |
669 | *vblank_time = ktime_sub_ns(etime, delta_ns); |
670 | ||
671 | if ((drm_debug & DRM_UT_VBL) == 0) | |
672 | return true; | |
673 | ||
674 | ts_etime = ktime_to_timespec64(etime); | |
675 | ts_vblank_time = ktime_to_timespec64(*vblank_time); | |
3ed4351a | 676 | |
67680d3c | 677 | DRM_DEBUG_VBL("crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n", |
3ed4351a | 678 | pipe, hpos, vpos, |
67680d3c AB |
679 | (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000, |
680 | (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, | |
681 | duration_ns / 1000, i); | |
3ed4351a DV |
682 | |
683 | return true; | |
684 | } | |
685 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
686 | ||
3ed4351a DV |
687 | /** |
688 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
689 | * vblank interval | |
690 | * @dev: DRM device | |
691 | * @pipe: index of CRTC whose vblank timestamp to retrieve | |
67680d3c | 692 | * @tvblank: Pointer to target time which should receive the timestamp |
3ed4351a DV |
693 | * @in_vblank_irq: |
694 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
695 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
696 | * if flag is set. | |
697 | * | |
698 | * Fetches the system timestamp corresponding to the time of the most recent | |
699 | * vblank interval on specified CRTC. May call into kms-driver to | |
700 | * compute the timestamp with a high-precision GPU specific method. | |
701 | * | |
702 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
703 | * call, i.e., it isn't very precisely locked to the true vblank. | |
704 | * | |
705 | * Returns: | |
706 | * True if timestamp is considered to be very precise, false otherwise. | |
707 | */ | |
708 | static bool | |
709 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 710 | ktime_t *tvblank, bool in_vblank_irq) |
3ed4351a DV |
711 | { |
712 | bool ret = false; | |
713 | ||
714 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
715 | int max_error = (int) drm_timestamp_precision * 1000; | |
716 | ||
717 | /* Query driver if possible and precision timestamping enabled. */ | |
718 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) | |
719 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, | |
720 | tvblank, in_vblank_irq); | |
721 | ||
722 | /* GPU high precision timestamp query unsupported or failed. | |
723 | * Return current monotonic/gettimeofday timestamp as best estimate. | |
724 | */ | |
725 | if (!ret) | |
25e1a798 | 726 | *tvblank = ktime_get(); |
3ed4351a DV |
727 | |
728 | return ret; | |
729 | } | |
730 | ||
731 | /** | |
732 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
733 | * @crtc: which counter to retrieve | |
734 | * | |
735 | * Fetches the "cooked" vblank count value that represents the number of | |
736 | * vblank events since the system was booted, including lost events due to | |
57d30230 DV |
737 | * modesetting activity. Note that this timer isn't correct against a racing |
738 | * vblank interrupt (since it only reports the software vblank counter), see | |
ca814b25 | 739 | * drm_crtc_accurate_vblank_count() for such use-cases. |
3ed4351a DV |
740 | * |
741 | * Returns: | |
742 | * The software vblank counter. | |
743 | */ | |
570e8696 | 744 | u64 drm_crtc_vblank_count(struct drm_crtc *crtc) |
3ed4351a DV |
745 | { |
746 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
747 | } | |
748 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
749 | ||
570e8696 KP |
750 | /** |
751 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the | |
752 | * system timestamp corresponding to that vblank counter value. | |
753 | * @dev: DRM device | |
754 | * @pipe: index of CRTC whose counter to retrieve | |
755 | * @vblanktime: Pointer to ktime_t to receive the vblank timestamp. | |
756 | * | |
757 | * Fetches the "cooked" vblank count value that represents the number of | |
758 | * vblank events since the system was booted, including lost events due to | |
759 | * modesetting activity. Returns corresponding system timestamp of the time | |
760 | * of the vblank interval that corresponds to the current vblank counter value. | |
761 | * | |
762 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
763 | */ | |
764 | static u64 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 765 | ktime_t *vblanktime) |
3ed4351a DV |
766 | { |
767 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
570e8696 | 768 | u64 vblank_count; |
3ed4351a DV |
769 | unsigned int seq; |
770 | ||
771 | if (WARN_ON(pipe >= dev->num_crtcs)) { | |
67680d3c | 772 | *vblanktime = 0; |
3ed4351a DV |
773 | return 0; |
774 | } | |
775 | ||
776 | do { | |
777 | seq = read_seqbegin(&vblank->seqlock); | |
778 | vblank_count = vblank->count; | |
779 | *vblanktime = vblank->time; | |
780 | } while (read_seqretry(&vblank->seqlock, seq)); | |
781 | ||
782 | return vblank_count; | |
783 | } | |
784 | ||
785 | /** | |
786 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
787 | * and the system timestamp corresponding to that vblank counter value | |
788 | * @crtc: which counter to retrieve | |
67680d3c | 789 | * @vblanktime: Pointer to time to receive the vblank timestamp. |
3ed4351a DV |
790 | * |
791 | * Fetches the "cooked" vblank count value that represents the number of | |
792 | * vblank events since the system was booted, including lost events due to | |
793 | * modesetting activity. Returns corresponding system timestamp of the time | |
794 | * of the vblank interval that corresponds to the current vblank counter value. | |
795 | */ | |
570e8696 | 796 | u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, |
67680d3c | 797 | ktime_t *vblanktime) |
3ed4351a DV |
798 | { |
799 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
800 | vblanktime); | |
801 | } | |
802 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
803 | ||
804 | static void send_vblank_event(struct drm_device *dev, | |
805 | struct drm_pending_vblank_event *e, | |
570e8696 | 806 | u64 seq, ktime_t now) |
3ed4351a | 807 | { |
bd386e51 | 808 | struct timespec64 tv; |
3ed4351a | 809 | |
bd386e51 KP |
810 | switch (e->event.base.type) { |
811 | case DRM_EVENT_VBLANK: | |
812 | case DRM_EVENT_FLIP_COMPLETE: | |
813 | tv = ktime_to_timespec64(now); | |
814 | e->event.vbl.sequence = seq; | |
815 | /* | |
816 | * e->event is a user space structure, with hardcoded unsigned | |
817 | * 32-bit seconds/microseconds. This is safe as we always use | |
818 | * monotonic timestamps since linux-4.15 | |
819 | */ | |
820 | e->event.vbl.tv_sec = tv.tv_sec; | |
821 | e->event.vbl.tv_usec = tv.tv_nsec / 1000; | |
822 | break; | |
3064abfa KP |
823 | case DRM_EVENT_CRTC_SEQUENCE: |
824 | if (seq) | |
825 | e->event.seq.sequence = seq; | |
826 | e->event.seq.time_ns = ktime_to_ns(now); | |
827 | break; | |
bd386e51 KP |
828 | } |
829 | trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, seq); | |
3ed4351a DV |
830 | drm_send_event_locked(dev, &e->base); |
831 | } | |
832 | ||
833 | /** | |
834 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip | |
835 | * @crtc: the source CRTC of the vblank event | |
836 | * @e: the event to send | |
837 | * | |
838 | * A lot of drivers need to generate vblank events for the very next vblank | |
839 | * interrupt. For example when the page flip interrupt happens when the page | |
840 | * flip gets armed, but not when it actually executes within the next vblank | |
841 | * period. This helper function implements exactly the required vblank arming | |
842 | * behaviour. | |
843 | * | |
844 | * NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an | |
845 | * atomic commit must ensure that the next vblank happens at exactly the same | |
846 | * time as the atomic commit is committed to the hardware. This function itself | |
e13a0583 | 847 | * does **not** protect against the next vblank interrupt racing with either this |
3ed4351a DV |
848 | * function call or the atomic commit operation. A possible sequence could be: |
849 | * | |
850 | * 1. Driver commits new hardware state into vblank-synchronized registers. | |
851 | * 2. A vblank happens, committing the hardware state. Also the corresponding | |
852 | * vblank interrupt is fired off and fully processed by the interrupt | |
853 | * handler. | |
854 | * 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event(). | |
855 | * 4. The event is only send out for the next vblank, which is wrong. | |
856 | * | |
857 | * An equivalent race can happen when the driver calls | |
858 | * drm_crtc_arm_vblank_event() before writing out the new hardware state. | |
859 | * | |
860 | * The only way to make this work safely is to prevent the vblank from firing | |
861 | * (and the hardware from committing anything else) until the entire atomic | |
862 | * commit sequence has run to completion. If the hardware does not have such a | |
863 | * feature (e.g. using a "go" bit), then it is unsafe to use this functions. | |
864 | * Instead drivers need to manually send out the event from their interrupt | |
865 | * handler by calling drm_crtc_send_vblank_event() and make sure that there's no | |
866 | * possible race with the hardware committing the atomic update. | |
867 | * | |
57d30230 DV |
868 | * Caller must hold a vblank reference for the event @e, which will be dropped |
869 | * when the next vblank arrives. | |
3ed4351a DV |
870 | */ |
871 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, | |
872 | struct drm_pending_vblank_event *e) | |
873 | { | |
874 | struct drm_device *dev = crtc->dev; | |
875 | unsigned int pipe = drm_crtc_index(crtc); | |
876 | ||
877 | assert_spin_locked(&dev->event_lock); | |
878 | ||
879 | e->pipe = pipe; | |
570e8696 | 880 | e->sequence = drm_crtc_accurate_vblank_count(crtc) + 1; |
3ed4351a DV |
881 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
882 | } | |
883 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); | |
884 | ||
885 | /** | |
886 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
887 | * @crtc: the source CRTC of the vblank event | |
888 | * @e: the event to send | |
889 | * | |
890 | * Updates sequence # and timestamp on event for the most recently processed | |
891 | * vblank, and sends it to userspace. Caller must hold event lock. | |
892 | * | |
893 | * See drm_crtc_arm_vblank_event() for a helper which can be used in certain | |
894 | * situation, especially to send out events for atomic commit operations. | |
895 | */ | |
896 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
897 | struct drm_pending_vblank_event *e) | |
898 | { | |
899 | struct drm_device *dev = crtc->dev; | |
570e8696 KP |
900 | u64 seq; |
901 | unsigned int pipe = drm_crtc_index(crtc); | |
67680d3c | 902 | ktime_t now; |
3ed4351a DV |
903 | |
904 | if (dev->num_crtcs > 0) { | |
905 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
906 | } else { | |
907 | seq = 0; | |
908 | ||
25e1a798 | 909 | now = ktime_get(); |
3ed4351a DV |
910 | } |
911 | e->pipe = pipe; | |
67680d3c | 912 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
913 | } |
914 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
915 | ||
916 | static int __enable_vblank(struct drm_device *dev, unsigned int pipe) | |
917 | { | |
918 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
919 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
920 | ||
921 | if (crtc->funcs->enable_vblank) | |
922 | return crtc->funcs->enable_vblank(crtc); | |
923 | } | |
924 | ||
925 | return dev->driver->enable_vblank(dev, pipe); | |
926 | } | |
927 | ||
3ed4351a DV |
928 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
929 | { | |
930 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
931 | int ret = 0; | |
932 | ||
933 | assert_spin_locked(&dev->vbl_lock); | |
934 | ||
935 | spin_lock(&dev->vblank_time_lock); | |
936 | ||
937 | if (!vblank->enabled) { | |
938 | /* | |
939 | * Enable vblank irqs under vblank_time_lock protection. | |
940 | * All vblank count & timestamp updates are held off | |
941 | * until we are done reinitializing master counter and | |
942 | * timestamps. Filtercode in drm_handle_vblank() will | |
943 | * prevent double-accounting of same vblank interval. | |
944 | */ | |
945 | ret = __enable_vblank(dev, pipe); | |
946 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); | |
947 | if (ret) { | |
948 | atomic_dec(&vblank->refcount); | |
949 | } else { | |
950 | drm_update_vblank_count(dev, pipe, 0); | |
951 | /* drm_update_vblank_count() includes a wmb so we just | |
952 | * need to ensure that the compiler emits the write | |
953 | * to mark the vblank as enabled after the call | |
954 | * to drm_update_vblank_count(). | |
955 | */ | |
956 | WRITE_ONCE(vblank->enabled, true); | |
957 | } | |
958 | } | |
959 | ||
960 | spin_unlock(&dev->vblank_time_lock); | |
961 | ||
962 | return ret; | |
963 | } | |
964 | ||
3ed4351a DV |
965 | static int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
966 | { | |
967 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
968 | unsigned long irqflags; | |
969 | int ret = 0; | |
970 | ||
971 | if (!dev->num_crtcs) | |
972 | return -EINVAL; | |
973 | ||
974 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
975 | return -EINVAL; | |
976 | ||
977 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
978 | /* Going from 0->1 means we have to enable interrupts again */ | |
979 | if (atomic_add_return(1, &vblank->refcount) == 1) { | |
980 | ret = drm_vblank_enable(dev, pipe); | |
981 | } else { | |
982 | if (!vblank->enabled) { | |
983 | atomic_dec(&vblank->refcount); | |
984 | ret = -EINVAL; | |
985 | } | |
986 | } | |
987 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
988 | ||
989 | return ret; | |
990 | } | |
991 | ||
992 | /** | |
993 | * drm_crtc_vblank_get - get a reference count on vblank events | |
994 | * @crtc: which CRTC to own | |
995 | * | |
996 | * Acquire a reference count on vblank events to avoid having them disabled | |
997 | * while in use. | |
998 | * | |
999 | * Returns: | |
1000 | * Zero on success or a negative error code on failure. | |
1001 | */ | |
1002 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1003 | { | |
1004 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1005 | } | |
1006 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1007 | ||
3ed4351a DV |
1008 | static void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
1009 | { | |
1010 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1011 | ||
1012 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1013 | return; | |
1014 | ||
1015 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) | |
1016 | return; | |
1017 | ||
1018 | /* Last user schedules interrupt disable */ | |
1019 | if (atomic_dec_and_test(&vblank->refcount)) { | |
1020 | if (drm_vblank_offdelay == 0) | |
1021 | return; | |
1022 | else if (drm_vblank_offdelay < 0) | |
e99e88a9 | 1023 | vblank_disable_fn(&vblank->disable_timer); |
3ed4351a DV |
1024 | else if (!dev->vblank_disable_immediate) |
1025 | mod_timer(&vblank->disable_timer, | |
1026 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1027 | } | |
1028 | } | |
1029 | ||
1030 | /** | |
1031 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1032 | * @crtc: which counter to give up | |
1033 | * | |
1034 | * Release ownership of a given vblank counter, turning off interrupts | |
1035 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1036 | */ | |
1037 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1038 | { | |
1039 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1040 | } | |
1041 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1042 | ||
1043 | /** | |
1044 | * drm_wait_one_vblank - wait for one vblank | |
1045 | * @dev: DRM device | |
1046 | * @pipe: CRTC index | |
1047 | * | |
1048 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. | |
1049 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
1050 | * due to lack of driver support or because the crtc is off. | |
57d30230 DV |
1051 | * |
1052 | * This is the legacy version of drm_crtc_wait_one_vblank(). | |
3ed4351a DV |
1053 | */ |
1054 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) | |
1055 | { | |
1056 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1057 | int ret; | |
b3405e59 | 1058 | u64 last; |
3ed4351a DV |
1059 | |
1060 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1061 | return; | |
1062 | ||
1063 | ret = drm_vblank_get(dev, pipe); | |
1064 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) | |
1065 | return; | |
1066 | ||
1067 | last = drm_vblank_count(dev, pipe); | |
1068 | ||
1069 | ret = wait_event_timeout(vblank->queue, | |
1070 | last != drm_vblank_count(dev, pipe), | |
1071 | msecs_to_jiffies(100)); | |
1072 | ||
1073 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); | |
1074 | ||
1075 | drm_vblank_put(dev, pipe); | |
1076 | } | |
1077 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1078 | ||
1079 | /** | |
1080 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1081 | * @crtc: DRM crtc | |
1082 | * | |
1083 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1084 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1085 | * due to lack of driver support or because the crtc is off. | |
1086 | */ | |
1087 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1088 | { | |
1089 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1090 | } | |
1091 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1092 | ||
1093 | /** | |
1094 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1095 | * @crtc: CRTC in question | |
1096 | * | |
1097 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1098 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1099 | * stored so that drm_vblank_on can restore it again. | |
1100 | * | |
1101 | * Drivers must use this function when the hardware vblank counter can get | |
57d30230 | 1102 | * reset, e.g. when suspending or disabling the @crtc in general. |
3ed4351a DV |
1103 | */ |
1104 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1105 | { | |
1106 | struct drm_device *dev = crtc->dev; | |
1107 | unsigned int pipe = drm_crtc_index(crtc); | |
1108 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1109 | struct drm_pending_vblank_event *e, *t; | |
67680d3c AB |
1110 | |
1111 | ktime_t now; | |
3ed4351a | 1112 | unsigned long irqflags; |
570e8696 | 1113 | u64 seq; |
3ed4351a DV |
1114 | |
1115 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1116 | return; | |
1117 | ||
1118 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1119 | ||
1120 | spin_lock(&dev->vbl_lock); | |
1121 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", | |
1122 | pipe, vblank->enabled, vblank->inmodeset); | |
1123 | ||
1124 | /* Avoid redundant vblank disables without previous | |
1125 | * drm_crtc_vblank_on(). */ | |
1126 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) | |
1127 | drm_vblank_disable_and_save(dev, pipe); | |
1128 | ||
1129 | wake_up(&vblank->queue); | |
1130 | ||
1131 | /* | |
1132 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1133 | * the vblank interrupt by bumping the refcount. | |
1134 | */ | |
1135 | if (!vblank->inmodeset) { | |
1136 | atomic_inc(&vblank->refcount); | |
1137 | vblank->inmodeset = 1; | |
1138 | } | |
1139 | spin_unlock(&dev->vbl_lock); | |
1140 | ||
1141 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
1142 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1143 | ||
1144 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1145 | if (e->pipe != pipe) | |
1146 | continue; | |
1147 | DRM_DEBUG("Sending premature vblank event on disable: " | |
570e8696 KP |
1148 | "wanted %llu, current %llu\n", |
1149 | e->sequence, seq); | |
3ed4351a DV |
1150 | list_del(&e->base.link); |
1151 | drm_vblank_put(dev, pipe); | |
67680d3c | 1152 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1153 | } |
1154 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1155 | ||
1156 | /* Will be reset by the modeset helpers when re-enabling the crtc by | |
1157 | * calling drm_calc_timestamping_constants(). */ | |
1158 | vblank->hwmode.crtc_clock = 0; | |
1159 | } | |
1160 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1161 | ||
1162 | /** | |
1163 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
1164 | * @crtc: CRTC in question | |
1165 | * | |
1166 | * Drivers can use this function to reset the vblank state to off at load time. | |
1167 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1168 | * drm_crtc_vblank_on() functions. The difference compared to | |
1169 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1170 | * and hence doesn't need to call any driver hooks. | |
57d30230 DV |
1171 | * |
1172 | * This is useful for recovering driver state e.g. on driver load, or on resume. | |
3ed4351a DV |
1173 | */ |
1174 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) | |
1175 | { | |
1176 | struct drm_device *dev = crtc->dev; | |
1177 | unsigned long irqflags; | |
1178 | unsigned int pipe = drm_crtc_index(crtc); | |
1179 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1180 | ||
1181 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1182 | /* | |
1183 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1184 | * interrupt by bumping the refcount. | |
1185 | */ | |
1186 | if (!vblank->inmodeset) { | |
1187 | atomic_inc(&vblank->refcount); | |
1188 | vblank->inmodeset = 1; | |
1189 | } | |
1190 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1191 | ||
1192 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1193 | } | |
1194 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1195 | ||
1196 | /** | |
1197 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1198 | * @crtc: CRTC in question | |
1199 | * | |
1200 | * This functions restores the vblank interrupt state captured with | |
57d30230 DV |
1201 | * drm_crtc_vblank_off() again and is generally called when enabling @crtc. Note |
1202 | * that calls to drm_crtc_vblank_on() and drm_crtc_vblank_off() can be | |
1203 | * unbalanced and so can also be unconditionally called in driver load code to | |
1204 | * reflect the current hardware state of the crtc. | |
3ed4351a DV |
1205 | */ |
1206 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1207 | { | |
1208 | struct drm_device *dev = crtc->dev; | |
1209 | unsigned int pipe = drm_crtc_index(crtc); | |
1210 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1211 | unsigned long irqflags; | |
1212 | ||
1213 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1214 | return; | |
1215 | ||
1216 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1217 | DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n", | |
1218 | pipe, vblank->enabled, vblank->inmodeset); | |
1219 | ||
1220 | /* Drop our private "prevent drm_vblank_get" refcount */ | |
1221 | if (vblank->inmodeset) { | |
1222 | atomic_dec(&vblank->refcount); | |
1223 | vblank->inmodeset = 0; | |
1224 | } | |
1225 | ||
1226 | drm_reset_vblank_timestamp(dev, pipe); | |
1227 | ||
1228 | /* | |
1229 | * re-enable interrupts if there are users left, or the | |
1230 | * user wishes vblank interrupts to be enabled all the time. | |
1231 | */ | |
1232 | if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) | |
1233 | WARN_ON(drm_vblank_enable(dev, pipe)); | |
1234 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1235 | } | |
1236 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1237 | ||
1238 | static void drm_legacy_vblank_pre_modeset(struct drm_device *dev, | |
1239 | unsigned int pipe) | |
1240 | { | |
1241 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1242 | ||
1243 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
1244 | if (!dev->num_crtcs) | |
1245 | return; | |
1246 | ||
1247 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1248 | return; | |
1249 | ||
1250 | /* | |
1251 | * To avoid all the problems that might happen if interrupts | |
1252 | * were enabled/disabled around or between these calls, we just | |
1253 | * have the kernel take a reference on the CRTC (just once though | |
1254 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1255 | * so that interrupts remain enabled in the interim. | |
1256 | */ | |
1257 | if (!vblank->inmodeset) { | |
1258 | vblank->inmodeset = 0x1; | |
1259 | if (drm_vblank_get(dev, pipe) == 0) | |
1260 | vblank->inmodeset |= 0x2; | |
1261 | } | |
1262 | } | |
1263 | ||
1264 | static void drm_legacy_vblank_post_modeset(struct drm_device *dev, | |
1265 | unsigned int pipe) | |
1266 | { | |
1267 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1268 | unsigned long irqflags; | |
1269 | ||
1270 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
1271 | if (!dev->num_crtcs) | |
1272 | return; | |
1273 | ||
1274 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1275 | return; | |
1276 | ||
1277 | if (vblank->inmodeset) { | |
1278 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1279 | drm_reset_vblank_timestamp(dev, pipe); | |
1280 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1281 | ||
1282 | if (vblank->inmodeset & 0x2) | |
1283 | drm_vblank_put(dev, pipe); | |
1284 | ||
1285 | vblank->inmodeset = 0; | |
1286 | } | |
1287 | } | |
1288 | ||
b6dcaaac DV |
1289 | int drm_legacy_modeset_ctl_ioctl(struct drm_device *dev, void *data, |
1290 | struct drm_file *file_priv) | |
3ed4351a DV |
1291 | { |
1292 | struct drm_modeset_ctl *modeset = data; | |
1293 | unsigned int pipe; | |
1294 | ||
1295 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1296 | if (!dev->num_crtcs) | |
1297 | return 0; | |
1298 | ||
1299 | /* KMS drivers handle this internally */ | |
1300 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) | |
1301 | return 0; | |
1302 | ||
1303 | pipe = modeset->crtc; | |
1304 | if (pipe >= dev->num_crtcs) | |
1305 | return -EINVAL; | |
1306 | ||
1307 | switch (modeset->cmd) { | |
1308 | case _DRM_PRE_MODESET: | |
1309 | drm_legacy_vblank_pre_modeset(dev, pipe); | |
1310 | break; | |
1311 | case _DRM_POST_MODESET: | |
1312 | drm_legacy_vblank_post_modeset(dev, pipe); | |
1313 | break; | |
1314 | default: | |
1315 | return -EINVAL; | |
1316 | } | |
1317 | ||
1318 | return 0; | |
1319 | } | |
1320 | ||
570e8696 | 1321 | static inline bool vblank_passed(u64 seq, u64 ref) |
3ed4351a DV |
1322 | { |
1323 | return (seq - ref) <= (1 << 23); | |
1324 | } | |
1325 | ||
1326 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, | |
570e8696 | 1327 | u64 req_seq, |
3ed4351a DV |
1328 | union drm_wait_vblank *vblwait, |
1329 | struct drm_file *file_priv) | |
1330 | { | |
1331 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1332 | struct drm_pending_vblank_event *e; | |
67680d3c | 1333 | ktime_t now; |
3ed4351a | 1334 | unsigned long flags; |
570e8696 | 1335 | u64 seq; |
3ed4351a DV |
1336 | int ret; |
1337 | ||
1338 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
1339 | if (e == NULL) { | |
1340 | ret = -ENOMEM; | |
1341 | goto err_put; | |
1342 | } | |
1343 | ||
1344 | e->pipe = pipe; | |
1345 | e->event.base.type = DRM_EVENT_VBLANK; | |
bd386e51 KP |
1346 | e->event.base.length = sizeof(e->event.vbl); |
1347 | e->event.vbl.user_data = vblwait->request.signal; | |
1348 | e->event.vbl.crtc_id = 0; | |
1349 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1350 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
1351 | if (crtc) | |
1352 | e->event.vbl.crtc_id = crtc->base.id; | |
1353 | } | |
3ed4351a DV |
1354 | |
1355 | spin_lock_irqsave(&dev->event_lock, flags); | |
1356 | ||
1357 | /* | |
1358 | * drm_crtc_vblank_off() might have been called after we called | |
1359 | * drm_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |
1360 | * vblank disable, so no need for further locking. The reference from | |
1361 | * drm_vblank_get() protects against vblank disable from another source. | |
1362 | */ | |
1363 | if (!READ_ONCE(vblank->enabled)) { | |
1364 | ret = -EINVAL; | |
1365 | goto err_unlock; | |
1366 | } | |
1367 | ||
1368 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |
1369 | &e->event.base); | |
1370 | ||
1371 | if (ret) | |
1372 | goto err_unlock; | |
1373 | ||
1374 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1375 | ||
570e8696 KP |
1376 | DRM_DEBUG("event on vblank count %llu, current %llu, crtc %u\n", |
1377 | req_seq, seq, pipe); | |
3ed4351a | 1378 | |
570e8696 | 1379 | trace_drm_vblank_event_queued(file_priv, pipe, req_seq); |
3ed4351a | 1380 | |
570e8696 KP |
1381 | e->sequence = req_seq; |
1382 | if (vblank_passed(seq, req_seq)) { | |
3ed4351a | 1383 | drm_vblank_put(dev, pipe); |
67680d3c | 1384 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1385 | vblwait->reply.sequence = seq; |
1386 | } else { | |
1387 | /* drm_handle_vblank_events will call drm_vblank_put */ | |
1388 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
570e8696 | 1389 | vblwait->reply.sequence = req_seq; |
3ed4351a DV |
1390 | } |
1391 | ||
1392 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1393 | ||
1394 | return 0; | |
1395 | ||
1396 | err_unlock: | |
1397 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1398 | kfree(e); | |
1399 | err_put: | |
1400 | drm_vblank_put(dev, pipe); | |
1401 | return ret; | |
1402 | } | |
1403 | ||
1404 | static bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait) | |
1405 | { | |
1406 | if (vblwait->request.sequence) | |
1407 | return false; | |
1408 | ||
1409 | return _DRM_VBLANK_RELATIVE == | |
1410 | (vblwait->request.type & (_DRM_VBLANK_TYPES_MASK | | |
1411 | _DRM_VBLANK_EVENT | | |
1412 | _DRM_VBLANK_NEXTONMISS)); | |
1413 | } | |
1414 | ||
570e8696 KP |
1415 | /* |
1416 | * Widen a 32-bit param to 64-bits. | |
1417 | * | |
1418 | * \param narrow 32-bit value (missing upper 32 bits) | |
1419 | * \param near 64-bit value that should be 'close' to near | |
1420 | * | |
1421 | * This function returns a 64-bit value using the lower 32-bits from | |
1422 | * 'narrow' and constructing the upper 32-bits so that the result is | |
1423 | * as close as possible to 'near'. | |
1424 | */ | |
1425 | ||
1426 | static u64 widen_32_to_64(u32 narrow, u64 near) | |
1427 | { | |
1428 | return near + (s32) (narrow - near); | |
1429 | } | |
1430 | ||
67680d3c AB |
1431 | static void drm_wait_vblank_reply(struct drm_device *dev, unsigned int pipe, |
1432 | struct drm_wait_vblank_reply *reply) | |
1433 | { | |
1434 | ktime_t now; | |
1435 | struct timespec64 ts; | |
1436 | ||
1437 | /* | |
1438 | * drm_wait_vblank_reply is a UAPI structure that uses 'long' | |
25e1a798 AB |
1439 | * to store the seconds. This is safe as we always use monotonic |
1440 | * timestamps since linux-4.15. | |
67680d3c AB |
1441 | */ |
1442 | reply->sequence = drm_vblank_count_and_time(dev, pipe, &now); | |
1443 | ts = ktime_to_timespec64(now); | |
1444 | reply->tval_sec = (u32)ts.tv_sec; | |
1445 | reply->tval_usec = ts.tv_nsec / 1000; | |
1446 | } | |
1447 | ||
b6dcaaac DV |
1448 | int drm_wait_vblank_ioctl(struct drm_device *dev, void *data, |
1449 | struct drm_file *file_priv) | |
3ed4351a | 1450 | { |
7de440db | 1451 | struct drm_crtc *crtc; |
3ed4351a DV |
1452 | struct drm_vblank_crtc *vblank; |
1453 | union drm_wait_vblank *vblwait = data; | |
1454 | int ret; | |
570e8696 | 1455 | u64 req_seq, seq; |
7de440db | 1456 | unsigned int pipe_index; |
570e8696 | 1457 | unsigned int flags, pipe, high_pipe; |
3ed4351a DV |
1458 | |
1459 | if (!dev->irq_enabled) | |
1460 | return -EINVAL; | |
1461 | ||
1462 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) | |
1463 | return -EINVAL; | |
1464 | ||
1465 | if (vblwait->request.type & | |
1466 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1467 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
1468 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", | |
1469 | vblwait->request.type, | |
1470 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1471 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
1472 | return -EINVAL; | |
1473 | } | |
1474 | ||
1475 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; | |
1476 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); | |
1477 | if (high_pipe) | |
7de440db | 1478 | pipe_index = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; |
3ed4351a | 1479 | else |
7de440db KP |
1480 | pipe_index = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1481 | ||
1482 | /* Convert lease-relative crtc index into global crtc index */ | |
1483 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1484 | pipe = 0; | |
1485 | drm_for_each_crtc(crtc, dev) { | |
1486 | if (drm_lease_held(file_priv, crtc->base.id)) { | |
1487 | if (pipe_index == 0) | |
1488 | break; | |
1489 | pipe_index--; | |
1490 | } | |
1491 | pipe++; | |
1492 | } | |
1493 | } else { | |
1494 | pipe = pipe_index; | |
1495 | } | |
1496 | ||
3ed4351a DV |
1497 | if (pipe >= dev->num_crtcs) |
1498 | return -EINVAL; | |
1499 | ||
1500 | vblank = &dev->vblank[pipe]; | |
1501 | ||
1502 | /* If the counter is currently enabled and accurate, short-circuit | |
1503 | * queries to return the cached timestamp of the last vblank. | |
1504 | */ | |
1505 | if (dev->vblank_disable_immediate && | |
1506 | drm_wait_vblank_is_query(vblwait) && | |
1507 | READ_ONCE(vblank->enabled)) { | |
67680d3c | 1508 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
3ed4351a DV |
1509 | return 0; |
1510 | } | |
1511 | ||
1512 | ret = drm_vblank_get(dev, pipe); | |
1513 | if (ret) { | |
1514 | DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret); | |
1515 | return ret; | |
1516 | } | |
1517 | seq = drm_vblank_count(dev, pipe); | |
1518 | ||
1519 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { | |
1520 | case _DRM_VBLANK_RELATIVE: | |
570e8696 KP |
1521 | req_seq = seq + vblwait->request.sequence; |
1522 | vblwait->request.sequence = req_seq; | |
3ed4351a | 1523 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; |
570e8696 | 1524 | break; |
3ed4351a | 1525 | case _DRM_VBLANK_ABSOLUTE: |
570e8696 | 1526 | req_seq = widen_32_to_64(vblwait->request.sequence, seq); |
3ed4351a DV |
1527 | break; |
1528 | default: | |
1529 | ret = -EINVAL; | |
1530 | goto done; | |
1531 | } | |
1532 | ||
1533 | if ((flags & _DRM_VBLANK_NEXTONMISS) && | |
570e8696 KP |
1534 | vblank_passed(seq, req_seq)) { |
1535 | req_seq = seq + 1; | |
1536 | vblwait->request.type &= ~_DRM_VBLANK_NEXTONMISS; | |
1537 | vblwait->request.sequence = req_seq; | |
1538 | } | |
3ed4351a DV |
1539 | |
1540 | if (flags & _DRM_VBLANK_EVENT) { | |
1541 | /* must hold on to the vblank ref until the event fires | |
1542 | * drm_vblank_put will be called asynchronously | |
1543 | */ | |
570e8696 | 1544 | return drm_queue_vblank_event(dev, pipe, req_seq, vblwait, file_priv); |
3ed4351a DV |
1545 | } |
1546 | ||
570e8696 KP |
1547 | if (req_seq != seq) { |
1548 | DRM_DEBUG("waiting on vblank count %llu, crtc %u\n", | |
1549 | req_seq, pipe); | |
3ed4351a DV |
1550 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, |
1551 | vblank_passed(drm_vblank_count(dev, pipe), | |
570e8696 | 1552 | req_seq) || |
3ed4351a DV |
1553 | !READ_ONCE(vblank->enabled)); |
1554 | } | |
1555 | ||
1556 | if (ret != -EINTR) { | |
67680d3c | 1557 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
3ed4351a DV |
1558 | |
1559 | DRM_DEBUG("crtc %d returning %u to client\n", | |
1560 | pipe, vblwait->reply.sequence); | |
1561 | } else { | |
1562 | DRM_DEBUG("crtc %d vblank wait interrupted by signal\n", pipe); | |
1563 | } | |
1564 | ||
1565 | done: | |
1566 | drm_vblank_put(dev, pipe); | |
1567 | return ret; | |
1568 | } | |
1569 | ||
1570 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) | |
1571 | { | |
1572 | struct drm_pending_vblank_event *e, *t; | |
67680d3c | 1573 | ktime_t now; |
570e8696 | 1574 | u64 seq; |
3ed4351a DV |
1575 | |
1576 | assert_spin_locked(&dev->event_lock); | |
1577 | ||
1578 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1579 | ||
1580 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1581 | if (e->pipe != pipe) | |
1582 | continue; | |
570e8696 | 1583 | if (!vblank_passed(seq, e->sequence)) |
3ed4351a DV |
1584 | continue; |
1585 | ||
570e8696 KP |
1586 | DRM_DEBUG("vblank event on %llu, current %llu\n", |
1587 | e->sequence, seq); | |
3ed4351a DV |
1588 | |
1589 | list_del(&e->base.link); | |
1590 | drm_vblank_put(dev, pipe); | |
67680d3c | 1591 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1592 | } |
1593 | ||
1594 | trace_drm_vblank_event(pipe, seq); | |
1595 | } | |
1596 | ||
1597 | /** | |
1598 | * drm_handle_vblank - handle a vblank event | |
1599 | * @dev: DRM device | |
1600 | * @pipe: index of CRTC where this event occurred | |
1601 | * | |
1602 | * Drivers should call this routine in their vblank interrupt handlers to | |
1603 | * update the vblank counter and send any signals that may be pending. | |
1604 | * | |
1605 | * This is the legacy version of drm_crtc_handle_vblank(). | |
1606 | */ | |
1607 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) | |
1608 | { | |
1609 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1610 | unsigned long irqflags; | |
1611 | bool disable_irq; | |
1612 | ||
1613 | if (WARN_ON_ONCE(!dev->num_crtcs)) | |
1614 | return false; | |
1615 | ||
1616 | if (WARN_ON(pipe >= dev->num_crtcs)) | |
1617 | return false; | |
1618 | ||
1619 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1620 | ||
1621 | /* Need timestamp lock to prevent concurrent execution with | |
1622 | * vblank enable/disable, as this would cause inconsistent | |
1623 | * or corrupted timestamps and vblank counts. | |
1624 | */ | |
1625 | spin_lock(&dev->vblank_time_lock); | |
1626 | ||
1627 | /* Vblank irq handling disabled. Nothing to do. */ | |
1628 | if (!vblank->enabled) { | |
1629 | spin_unlock(&dev->vblank_time_lock); | |
1630 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1631 | return false; | |
1632 | } | |
1633 | ||
1634 | drm_update_vblank_count(dev, pipe, true); | |
1635 | ||
1636 | spin_unlock(&dev->vblank_time_lock); | |
1637 | ||
1638 | wake_up(&vblank->queue); | |
1639 | ||
1640 | /* With instant-off, we defer disabling the interrupt until after | |
1641 | * we finish processing the following vblank after all events have | |
1642 | * been signaled. The disable has to be last (after | |
1643 | * drm_handle_vblank_events) so that the timestamp is always accurate. | |
1644 | */ | |
1645 | disable_irq = (dev->vblank_disable_immediate && | |
1646 | drm_vblank_offdelay > 0 && | |
1647 | !atomic_read(&vblank->refcount)); | |
1648 | ||
1649 | drm_handle_vblank_events(dev, pipe); | |
1650 | ||
1651 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1652 | ||
1653 | if (disable_irq) | |
e99e88a9 | 1654 | vblank_disable_fn(&vblank->disable_timer); |
3ed4351a DV |
1655 | |
1656 | return true; | |
1657 | } | |
1658 | EXPORT_SYMBOL(drm_handle_vblank); | |
1659 | ||
1660 | /** | |
1661 | * drm_crtc_handle_vblank - handle a vblank event | |
1662 | * @crtc: where this event occurred | |
1663 | * | |
1664 | * Drivers should call this routine in their vblank interrupt handlers to | |
1665 | * update the vblank counter and send any signals that may be pending. | |
1666 | * | |
1667 | * This is the native KMS version of drm_handle_vblank(). | |
1668 | * | |
1669 | * Returns: | |
1670 | * True if the event was successfully handled, false on failure. | |
1671 | */ | |
1672 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1673 | { | |
1674 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1675 | } | |
1676 | EXPORT_SYMBOL(drm_crtc_handle_vblank); | |
3064abfa KP |
1677 | |
1678 | /* | |
1679 | * Get crtc VBLANK count. | |
1680 | * | |
1681 | * \param dev DRM device | |
1682 | * \param data user arguement, pointing to a drm_crtc_get_sequence structure. | |
1683 | * \param file_priv drm file private for the user's open file descriptor | |
1684 | */ | |
1685 | ||
1686 | int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data, | |
1687 | struct drm_file *file_priv) | |
1688 | { | |
1689 | struct drm_crtc *crtc; | |
1690 | struct drm_vblank_crtc *vblank; | |
1691 | int pipe; | |
1692 | struct drm_crtc_get_sequence *get_seq = data; | |
1693 | ktime_t now; | |
1694 | bool vblank_enabled; | |
1695 | int ret; | |
1696 | ||
1697 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
1698 | return -EINVAL; | |
1699 | ||
1700 | if (!dev->irq_enabled) | |
1701 | return -EINVAL; | |
1702 | ||
1703 | crtc = drm_crtc_find(dev, file_priv, get_seq->crtc_id); | |
1704 | if (!crtc) | |
1705 | return -ENOENT; | |
1706 | ||
1707 | pipe = drm_crtc_index(crtc); | |
1708 | ||
1709 | vblank = &dev->vblank[pipe]; | |
1710 | vblank_enabled = dev->vblank_disable_immediate && READ_ONCE(vblank->enabled); | |
1711 | ||
1712 | if (!vblank_enabled) { | |
1713 | ret = drm_crtc_vblank_get(crtc); | |
1714 | if (ret) { | |
1715 | DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret); | |
1716 | return ret; | |
1717 | } | |
1718 | } | |
1719 | drm_modeset_lock(&crtc->mutex, NULL); | |
1720 | if (crtc->state) | |
1721 | get_seq->active = crtc->state->enable; | |
1722 | else | |
1723 | get_seq->active = crtc->enabled; | |
1724 | drm_modeset_unlock(&crtc->mutex); | |
1725 | get_seq->sequence = drm_vblank_count_and_time(dev, pipe, &now); | |
1726 | get_seq->sequence_ns = ktime_to_ns(now); | |
1727 | if (!vblank_enabled) | |
1728 | drm_crtc_vblank_put(crtc); | |
1729 | return 0; | |
1730 | } | |
1731 | ||
1732 | /* | |
1733 | * Queue a event for VBLANK sequence | |
1734 | * | |
1735 | * \param dev DRM device | |
1736 | * \param data user arguement, pointing to a drm_crtc_queue_sequence structure. | |
1737 | * \param file_priv drm file private for the user's open file descriptor | |
1738 | */ | |
1739 | ||
1740 | int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data, | |
1741 | struct drm_file *file_priv) | |
1742 | { | |
1743 | struct drm_crtc *crtc; | |
1744 | struct drm_vblank_crtc *vblank; | |
1745 | int pipe; | |
1746 | struct drm_crtc_queue_sequence *queue_seq = data; | |
1747 | ktime_t now; | |
1748 | struct drm_pending_vblank_event *e; | |
1749 | u32 flags; | |
1750 | u64 seq; | |
1751 | u64 req_seq; | |
1752 | int ret; | |
1753 | unsigned long spin_flags; | |
1754 | ||
1755 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
1756 | return -EINVAL; | |
1757 | ||
1758 | if (!dev->irq_enabled) | |
1759 | return -EINVAL; | |
1760 | ||
1761 | crtc = drm_crtc_find(dev, file_priv, queue_seq->crtc_id); | |
1762 | if (!crtc) | |
1763 | return -ENOENT; | |
1764 | ||
1765 | flags = queue_seq->flags; | |
1766 | /* Check valid flag bits */ | |
1767 | if (flags & ~(DRM_CRTC_SEQUENCE_RELATIVE| | |
1768 | DRM_CRTC_SEQUENCE_NEXT_ON_MISS)) | |
1769 | return -EINVAL; | |
1770 | ||
1771 | pipe = drm_crtc_index(crtc); | |
1772 | ||
1773 | vblank = &dev->vblank[pipe]; | |
1774 | ||
1775 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
1776 | if (e == NULL) | |
1777 | return -ENOMEM; | |
1778 | ||
1779 | ret = drm_crtc_vblank_get(crtc); | |
1780 | if (ret) { | |
1781 | DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret); | |
1782 | goto err_free; | |
1783 | } | |
1784 | ||
1785 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1786 | req_seq = queue_seq->sequence; | |
1787 | ||
1788 | if (flags & DRM_CRTC_SEQUENCE_RELATIVE) | |
1789 | req_seq += seq; | |
1790 | ||
1791 | if ((flags & DRM_CRTC_SEQUENCE_NEXT_ON_MISS) && vblank_passed(seq, req_seq)) | |
1792 | req_seq = seq + 1; | |
1793 | ||
1794 | e->pipe = pipe; | |
1795 | e->event.base.type = DRM_EVENT_CRTC_SEQUENCE; | |
1796 | e->event.base.length = sizeof(e->event.seq); | |
1797 | e->event.seq.user_data = queue_seq->user_data; | |
1798 | ||
1799 | spin_lock_irqsave(&dev->event_lock, spin_flags); | |
1800 | ||
1801 | /* | |
1802 | * drm_crtc_vblank_off() might have been called after we called | |
1803 | * drm_crtc_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |
1804 | * vblank disable, so no need for further locking. The reference from | |
1805 | * drm_crtc_vblank_get() protects against vblank disable from another source. | |
1806 | */ | |
1807 | if (!READ_ONCE(vblank->enabled)) { | |
1808 | ret = -EINVAL; | |
1809 | goto err_unlock; | |
1810 | } | |
1811 | ||
1812 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |
1813 | &e->event.base); | |
1814 | ||
1815 | if (ret) | |
1816 | goto err_unlock; | |
1817 | ||
1818 | e->sequence = req_seq; | |
1819 | ||
1820 | if (vblank_passed(seq, req_seq)) { | |
1821 | drm_crtc_vblank_put(crtc); | |
1822 | send_vblank_event(dev, e, seq, now); | |
1823 | queue_seq->sequence = seq; | |
1824 | } else { | |
1825 | /* drm_handle_vblank_events will call drm_vblank_put */ | |
1826 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
1827 | queue_seq->sequence = req_seq; | |
1828 | } | |
1829 | ||
1830 | spin_unlock_irqrestore(&dev->event_lock, spin_flags); | |
1831 | return 0; | |
1832 | ||
1833 | err_unlock: | |
1834 | spin_unlock_irqrestore(&dev->event_lock, spin_flags); | |
1835 | drm_crtc_vblank_put(crtc); | |
1836 | err_free: | |
1837 | kfree(e); | |
1838 | return ret; | |
1839 | } |