Commit | Line | Data |
---|---|---|
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 | ||
3ed4351a | 27 | #include <linux/export.h> |
5e6c2b4f | 28 | #include <linux/kthread.h> |
0500c04e SR |
29 | #include <linux/moduleparam.h> |
30 | ||
31 | #include <drm/drm_crtc.h> | |
32 | #include <drm/drm_drv.h> | |
33 | #include <drm/drm_framebuffer.h> | |
c23d686f | 34 | #include <drm/drm_managed.h> |
f1e2b637 | 35 | #include <drm/drm_modeset_helper_vtables.h> |
0500c04e | 36 | #include <drm/drm_print.h> |
0500c04e | 37 | #include <drm/drm_vblank.h> |
3ed4351a | 38 | |
3ed4351a | 39 | #include "drm_internal.h" |
0500c04e | 40 | #include "drm_trace.h" |
3ed4351a | 41 | |
57d30230 DV |
42 | /** |
43 | * DOC: vblank handling | |
44 | * | |
56b165fe SR |
45 | * From the computer's perspective, every time the monitor displays |
46 | * a new frame the scanout engine has "scanned out" the display image | |
47 | * from top to bottom, one row of pixels at a time. The current row | |
48 | * of pixels is referred to as the current scanline. | |
49 | * | |
50 | * In addition to the display's visible area, there's usually a couple of | |
51 | * extra scanlines which aren't actually displayed on the screen. | |
52 | * These extra scanlines don't contain image data and are occasionally used | |
53 | * for features like audio and infoframes. The region made up of these | |
54 | * scanlines is referred to as the vertical blanking region, or vblank for | |
55 | * short. | |
56 | * | |
57 | * For historical reference, the vertical blanking period was designed to | |
58 | * give the electron gun (on CRTs) enough time to move back to the top of | |
59 | * the screen to start scanning out the next frame. Similar for horizontal | |
60 | * blanking periods. They were designed to give the electron gun enough | |
61 | * time to move back to the other side of the screen to start scanning the | |
62 | * next scanline. | |
63 | * | |
64 | * :: | |
65 | * | |
66 | * | |
67 | * physical → ⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽ | |
68 | * top of | | | |
69 | * display | | | |
70 | * | New frame | | |
71 | * | | | |
72 | * |↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓| | |
73 | * |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| ← Scanline, | |
74 | * |↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓| updates the | |
75 | * | | frame as it | |
76 | * | | travels down | |
8323c625 | 77 | * | | ("scan out") |
56b165fe SR |
78 | * | Old frame | |
79 | * | | | |
80 | * | | | |
81 | * | | | |
82 | * | | physical | |
83 | * | | bottom of | |
84 | * vertical |⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽| ← display | |
85 | * blanking ┆xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx┆ | |
86 | * region → ┆xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx┆ | |
87 | * ┆xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx┆ | |
88 | * start of → ⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽ | |
89 | * new frame | |
90 | * | |
91 | * "Physical top of display" is the reference point for the high-precision/ | |
92 | * corrected timestamp. | |
93 | * | |
94 | * On a lot of display hardware, programming needs to take effect during the | |
95 | * vertical blanking period so that settings like gamma, the image buffer | |
96 | * buffer to be scanned out, etc. can safely be changed without showing | |
97 | * any visual artifacts on the screen. In some unforgiving hardware, some of | |
98 | * this programming has to both start and end in the same vblank. To help | |
99 | * with the timing of the hardware programming, an interrupt is usually | |
100 | * available to notify the driver when it can start the updating of registers. | |
101 | * The interrupt is in this context named the vblank interrupt. | |
102 | * | |
103 | * The vblank interrupt may be fired at different points depending on the | |
104 | * hardware. Some hardware implementations will fire the interrupt when the | |
105 | * new frame start, other implementations will fire the interrupt at different | |
106 | * points in time. | |
107 | * | |
57d30230 DV |
108 | * Vertical blanking plays a major role in graphics rendering. To achieve |
109 | * tear-free display, users must synchronize page flips and/or rendering to | |
110 | * vertical blanking. The DRM API offers ioctls to perform page flips | |
111 | * synchronized to vertical blanking and wait for vertical blanking. | |
112 | * | |
113 | * The DRM core handles most of the vertical blanking management logic, which | |
114 | * involves filtering out spurious interrupts, keeping race-free blanking | |
115 | * counters, coping with counter wrap-around and resets and keeping use counts. | |
116 | * It relies on the driver to generate vertical blanking interrupts and | |
117 | * optionally provide a hardware vertical blanking counter. | |
118 | * | |
119 | * Drivers must initialize the vertical blanking handling core with a call to | |
120 | * drm_vblank_init(). Minimally, a driver needs to implement | |
121 | * &drm_crtc_funcs.enable_vblank and &drm_crtc_funcs.disable_vblank plus call | |
1e55a53a | 122 | * drm_crtc_handle_vblank() in its vblank interrupt handler for working vblank |
57d30230 DV |
123 | * support. |
124 | * | |
125 | * Vertical blanking interrupts can be enabled by the DRM core or by drivers | |
126 | * themselves (for instance to handle page flipping operations). The DRM core | |
127 | * maintains a vertical blanking use count to ensure that the interrupts are not | |
128 | * disabled while a user still needs them. To increment the use count, drivers | |
129 | * call drm_crtc_vblank_get() and release the vblank reference again with | |
130 | * drm_crtc_vblank_put(). In between these two calls vblank interrupts are | |
131 | * guaranteed to be enabled. | |
132 | * | |
133 | * On many hardware disabling the vblank interrupt cannot be done in a race-free | |
134 | * manner, see &drm_driver.vblank_disable_immediate and | |
135 | * &drm_driver.max_vblank_count. In that case the vblank core only disables the | |
136 | * vblanks after a timer has expired, which can be configured through the | |
137 | * ``vblankoffdelay`` module parameter. | |
7beb691f TZ |
138 | * |
139 | * Drivers for hardware without support for vertical-blanking interrupts | |
140 | * must not call drm_vblank_init(). For such drivers, atomic helpers will | |
141 | * automatically generate fake vblank events as part of the display update. | |
142 | * This functionality also can be controlled by the driver by enabling and | |
143 | * disabling struct drm_crtc_state.no_vblank. | |
57d30230 DV |
144 | */ |
145 | ||
3ed4351a DV |
146 | /* Retry timestamp calculation up to 3 times to satisfy |
147 | * drm_timestamp_precision before giving up. | |
148 | */ | |
149 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
150 | ||
151 | /* Threshold in nanoseconds for detection of redundant | |
152 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
153 | */ | |
154 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
155 | ||
156 | static bool | |
157 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 158 | ktime_t *tvblank, bool in_vblank_irq); |
3ed4351a DV |
159 | |
160 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ | |
161 | ||
3ed4351a DV |
162 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ |
163 | ||
164 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
165 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
3ed4351a DV |
166 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); |
167 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); | |
3ed4351a DV |
168 | |
169 | static void store_vblank(struct drm_device *dev, unsigned int pipe, | |
170 | u32 vblank_count_inc, | |
67680d3c | 171 | ktime_t t_vblank, u32 last) |
3ed4351a DV |
172 | { |
173 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
174 | ||
175 | assert_spin_locked(&dev->vblank_time_lock); | |
176 | ||
177 | vblank->last = last; | |
178 | ||
179 | write_seqlock(&vblank->seqlock); | |
67680d3c | 180 | vblank->time = t_vblank; |
bd7e3f3b | 181 | atomic64_add(vblank_count_inc, &vblank->count); |
3ed4351a DV |
182 | write_sequnlock(&vblank->seqlock); |
183 | } | |
184 | ||
ed20151a VS |
185 | static u32 drm_max_vblank_count(struct drm_device *dev, unsigned int pipe) |
186 | { | |
187 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
188 | ||
189 | return vblank->max_vblank_count ?: dev->max_vblank_count; | |
190 | } | |
191 | ||
3ed4351a DV |
192 | /* |
193 | * "No hw counter" fallback implementation of .get_vblank_counter() hook, | |
0ae865ef | 194 | * if there is no usable hardware frame counter available. |
3ed4351a DV |
195 | */ |
196 | static u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) | |
197 | { | |
5a4784f4 | 198 | drm_WARN_ON_ONCE(dev, drm_max_vblank_count(dev, pipe) != 0); |
3ed4351a DV |
199 | return 0; |
200 | } | |
201 | ||
202 | static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe) | |
203 | { | |
204 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
205 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
206 | ||
5a4784f4 | 207 | if (drm_WARN_ON(dev, !crtc)) |
4ffb8dee JM |
208 | return 0; |
209 | ||
3ed4351a DV |
210 | if (crtc->funcs->get_vblank_counter) |
211 | return crtc->funcs->get_vblank_counter(crtc); | |
57bb1ee6 | 212 | } |
3ed4351a DV |
213 | |
214 | return drm_vblank_no_hw_counter(dev, pipe); | |
215 | } | |
216 | ||
217 | /* | |
218 | * Reset the stored timestamp for the current vblank count to correspond | |
219 | * to the last vblank occurred. | |
220 | * | |
221 | * Only to be called from drm_crtc_vblank_on(). | |
222 | * | |
223 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes | |
224 | * device vblank fields. | |
225 | */ | |
226 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) | |
227 | { | |
228 | u32 cur_vblank; | |
229 | bool rc; | |
67680d3c | 230 | ktime_t t_vblank; |
3ed4351a DV |
231 | int count = DRM_TIMESTAMP_MAXRETRIES; |
232 | ||
233 | spin_lock(&dev->vblank_time_lock); | |
234 | ||
235 | /* | |
236 | * sample the current counter to avoid random jumps | |
237 | * when drm_vblank_enable() applies the diff | |
238 | */ | |
239 | do { | |
240 | cur_vblank = __get_vblank_counter(dev, pipe); | |
241 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false); | |
242 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
243 | ||
244 | /* | |
245 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
246 | * available and didn't fail. Otherwise reinitialize delayed at next vblank | |
247 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
248 | */ | |
249 | if (!rc) | |
67680d3c | 250 | t_vblank = 0; |
3ed4351a DV |
251 | |
252 | /* | |
253 | * +1 to make sure user will never see the same | |
254 | * vblank counter value before and after a modeset | |
255 | */ | |
67680d3c | 256 | store_vblank(dev, pipe, 1, t_vblank, cur_vblank); |
3ed4351a DV |
257 | |
258 | spin_unlock(&dev->vblank_time_lock); | |
259 | } | |
260 | ||
261 | /* | |
262 | * Call back into the driver to update the appropriate vblank counter | |
263 | * (specified by @pipe). Deal with wraparound, if it occurred, and | |
264 | * update the last read value so we can deal with wraparound on the next | |
265 | * call if necessary. | |
266 | * | |
267 | * Only necessary when going from off->on, to account for frames we | |
268 | * didn't get an interrupt for. | |
269 | * | |
270 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes | |
271 | * device vblank fields. | |
272 | */ | |
273 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, | |
274 | bool in_vblank_irq) | |
275 | { | |
276 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
277 | u32 cur_vblank, diff; | |
278 | bool rc; | |
67680d3c | 279 | ktime_t t_vblank; |
3ed4351a DV |
280 | int count = DRM_TIMESTAMP_MAXRETRIES; |
281 | int framedur_ns = vblank->framedur_ns; | |
ed20151a | 282 | u32 max_vblank_count = drm_max_vblank_count(dev, pipe); |
3ed4351a DV |
283 | |
284 | /* | |
285 | * Interrupts were disabled prior to this call, so deal with counter | |
286 | * wrap if needed. | |
287 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events | |
288 | * here if the register is small or we had vblank interrupts off for | |
289 | * a long time. | |
290 | * | |
291 | * We repeat the hardware vblank counter & timestamp query until | |
292 | * we get consistent results. This to prevent races between gpu | |
293 | * updating its hardware counter while we are retrieving the | |
294 | * corresponding vblank timestamp. | |
295 | */ | |
296 | do { | |
297 | cur_vblank = __get_vblank_counter(dev, pipe); | |
298 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq); | |
299 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
300 | ||
ed20151a | 301 | if (max_vblank_count) { |
3ed4351a | 302 | /* trust the hw counter when it's around */ |
ed20151a | 303 | diff = (cur_vblank - vblank->last) & max_vblank_count; |
3ed4351a | 304 | } else if (rc && framedur_ns) { |
67680d3c | 305 | u64 diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); |
3ed4351a DV |
306 | |
307 | /* | |
308 | * Figure out how many vblanks we've missed based | |
309 | * on the difference in the timestamps and the | |
310 | * frame/field duration. | |
311 | */ | |
41ff5bd8 | 312 | |
02149a76 SR |
313 | drm_dbg_vbl(dev, "crtc %u: Calculating number of vblanks." |
314 | " diff_ns = %lld, framedur_ns = %d)\n", | |
315 | pipe, (long long)diff_ns, framedur_ns); | |
41ff5bd8 | 316 | |
3ed4351a DV |
317 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); |
318 | ||
319 | if (diff == 0 && in_vblank_irq) | |
02149a76 SR |
320 | drm_dbg_vbl(dev, "crtc %u: Redundant vblirq ignored\n", |
321 | pipe); | |
3ed4351a DV |
322 | } else { |
323 | /* some kind of default for drivers w/o accurate vbl timestamping */ | |
324 | diff = in_vblank_irq ? 1 : 0; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset | |
329 | * interval? If so then vblank irqs keep running and it will likely | |
330 | * happen that the hardware vblank counter is not trustworthy as it | |
331 | * might reset at some point in that interval and vblank timestamps | |
332 | * are not trustworthy either in that interval. Iow. this can result | |
333 | * in a bogus diff >> 1 which must be avoided as it would cause | |
334 | * random large forward jumps of the software vblank counter. | |
335 | */ | |
336 | if (diff > 1 && (vblank->inmodeset & 0x2)) { | |
02149a76 SR |
337 | drm_dbg_vbl(dev, |
338 | "clamping vblank bump to 1 on crtc %u: diffr=%u" | |
339 | " due to pre-modeset.\n", pipe, diff); | |
3ed4351a DV |
340 | diff = 1; |
341 | } | |
342 | ||
02149a76 SR |
343 | drm_dbg_vbl(dev, "updating vblank count on crtc %u:" |
344 | " current=%llu, diff=%u, hw=%u hw_last=%u\n", | |
345 | pipe, (unsigned long long)atomic64_read(&vblank->count), | |
346 | diff, cur_vblank, vblank->last); | |
3ed4351a DV |
347 | |
348 | if (diff == 0) { | |
5a4784f4 | 349 | drm_WARN_ON_ONCE(dev, cur_vblank != vblank->last); |
3ed4351a DV |
350 | return; |
351 | } | |
352 | ||
353 | /* | |
354 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
355 | * available and didn't fail, or we were called from the vblank interrupt. | |
356 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 | |
357 | * for now, to mark the vblanktimestamp as invalid. | |
358 | */ | |
138b87fa | 359 | if (!rc && !in_vblank_irq) |
67680d3c | 360 | t_vblank = 0; |
3ed4351a | 361 | |
67680d3c | 362 | store_vblank(dev, pipe, diff, t_vblank, cur_vblank); |
3ed4351a DV |
363 | } |
364 | ||
5e6c2b4f | 365 | u64 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
3ed4351a DV |
366 | { |
367 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
bd7e3f3b | 368 | u64 count; |
3ed4351a | 369 | |
5a4784f4 | 370 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
371 | return 0; |
372 | ||
bd7e3f3b DV |
373 | count = atomic64_read(&vblank->count); |
374 | ||
375 | /* | |
376 | * This read barrier corresponds to the implicit write barrier of the | |
377 | * write seqlock in store_vblank(). Note that this is the only place | |
378 | * where we need an explicit barrier, since all other access goes | |
379 | * through drm_vblank_count_and_time(), which already has the required | |
380 | * read barrier curtesy of the read seqlock. | |
381 | */ | |
382 | smp_rmb(); | |
383 | ||
384 | return count; | |
3ed4351a DV |
385 | } |
386 | ||
387 | /** | |
ca814b25 | 388 | * drm_crtc_accurate_vblank_count - retrieve the master vblank counter |
3ed4351a DV |
389 | * @crtc: which counter to retrieve |
390 | * | |
57d30230 DV |
391 | * This function is similar to drm_crtc_vblank_count() but this function |
392 | * interpolates to handle a race with vblank interrupts using the high precision | |
393 | * timestamping support. | |
3ed4351a | 394 | * |
57d30230 DV |
395 | * This is mostly useful for hardware that can obtain the scanout position, but |
396 | * doesn't have a hardware frame counter. | |
3ed4351a | 397 | */ |
3b765c0b | 398 | u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc) |
3ed4351a DV |
399 | { |
400 | struct drm_device *dev = crtc->dev; | |
401 | unsigned int pipe = drm_crtc_index(crtc); | |
3b765c0b | 402 | u64 vblank; |
3ed4351a DV |
403 | unsigned long flags; |
404 | ||
5a4784f4 SR |
405 | drm_WARN_ONCE(dev, drm_debug_enabled(DRM_UT_VBL) && |
406 | !crtc->funcs->get_vblank_timestamp, | |
407 | "This function requires support for accurate vblank timestamps."); | |
3ed4351a DV |
408 | |
409 | spin_lock_irqsave(&dev->vblank_time_lock, flags); | |
410 | ||
411 | drm_update_vblank_count(dev, pipe, false); | |
412 | vblank = drm_vblank_count(dev, pipe); | |
413 | ||
414 | spin_unlock_irqrestore(&dev->vblank_time_lock, flags); | |
415 | ||
416 | return vblank; | |
417 | } | |
ca814b25 | 418 | EXPORT_SYMBOL(drm_crtc_accurate_vblank_count); |
3ed4351a DV |
419 | |
420 | static void __disable_vblank(struct drm_device *dev, unsigned int pipe) | |
421 | { | |
422 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
423 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
424 | ||
5a4784f4 | 425 | if (drm_WARN_ON(dev, !crtc)) |
4ffb8dee JM |
426 | return; |
427 | ||
f397d66b | 428 | if (crtc->funcs->disable_vblank) |
3ed4351a | 429 | crtc->funcs->disable_vblank(crtc); |
57bb1ee6 | 430 | } |
3ed4351a DV |
431 | } |
432 | ||
433 | /* | |
434 | * Disable vblank irq's on crtc, make sure that last vblank count | |
435 | * of hardware and corresponding consistent software vblank counter | |
436 | * are preserved, even if there are any spurious vblank irq's after | |
437 | * disable. | |
438 | */ | |
439 | void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) | |
440 | { | |
441 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
442 | unsigned long irqflags; | |
443 | ||
444 | assert_spin_locked(&dev->vbl_lock); | |
445 | ||
446 | /* Prevent vblank irq processing while disabling vblank irqs, | |
447 | * so no updates of timestamps or count can happen after we've | |
448 | * disabled. Needed to prevent races in case of delayed irq's. | |
449 | */ | |
450 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
451 | ||
452 | /* | |
68036b08 DP |
453 | * Update vblank count and disable vblank interrupts only if the |
454 | * interrupts were enabled. This avoids calling the ->disable_vblank() | |
455 | * operation in atomic context with the hardware potentially runtime | |
456 | * suspended. | |
3ed4351a | 457 | */ |
68036b08 DP |
458 | if (!vblank->enabled) |
459 | goto out; | |
3ed4351a DV |
460 | |
461 | /* | |
68036b08 | 462 | * Update the count and timestamp to maintain the |
3ed4351a DV |
463 | * appearance that the counter has been ticking all along until |
464 | * this time. This makes the count account for the entire time | |
465 | * between drm_crtc_vblank_on() and drm_crtc_vblank_off(). | |
466 | */ | |
467 | drm_update_vblank_count(dev, pipe, false); | |
68036b08 DP |
468 | __disable_vblank(dev, pipe); |
469 | vblank->enabled = false; | |
3ed4351a | 470 | |
68036b08 | 471 | out: |
3ed4351a DV |
472 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
473 | } | |
474 | ||
e99e88a9 | 475 | static void vblank_disable_fn(struct timer_list *t) |
3ed4351a | 476 | { |
e99e88a9 | 477 | struct drm_vblank_crtc *vblank = from_timer(vblank, t, disable_timer); |
3ed4351a DV |
478 | struct drm_device *dev = vblank->dev; |
479 | unsigned int pipe = vblank->pipe; | |
480 | unsigned long irqflags; | |
481 | ||
482 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
483 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
02149a76 | 484 | drm_dbg_core(dev, "disabling vblank on crtc %u\n", pipe); |
3ed4351a DV |
485 | drm_vblank_disable_and_save(dev, pipe); |
486 | } | |
487 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
488 | } | |
489 | ||
c23d686f | 490 | static void drm_vblank_init_release(struct drm_device *dev, void *ptr) |
3ed4351a | 491 | { |
a7e5e06d | 492 | struct drm_vblank_crtc *vblank = ptr; |
3ed4351a | 493 | |
a7e5e06d LP |
494 | drm_WARN_ON(dev, READ_ONCE(vblank->enabled) && |
495 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
3ed4351a | 496 | |
5e6c2b4f | 497 | drm_vblank_destroy_worker(vblank); |
a7e5e06d | 498 | del_timer_sync(&vblank->disable_timer); |
3ed4351a | 499 | } |
3ed4351a DV |
500 | |
501 | /** | |
502 | * drm_vblank_init - initialize vblank support | |
503 | * @dev: DRM device | |
504 | * @num_crtcs: number of CRTCs supported by @dev | |
505 | * | |
506 | * This function initializes vblank support for @num_crtcs display pipelines. | |
c23d686f | 507 | * Cleanup is handled automatically through a cleanup function added with |
a7e5e06d | 508 | * drmm_add_action_or_reset(). |
3ed4351a DV |
509 | * |
510 | * Returns: | |
511 | * Zero on success or a negative error code on failure. | |
512 | */ | |
513 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) | |
514 | { | |
c23d686f | 515 | int ret; |
3ed4351a DV |
516 | unsigned int i; |
517 | ||
518 | spin_lock_init(&dev->vbl_lock); | |
519 | spin_lock_init(&dev->vblank_time_lock); | |
520 | ||
c23d686f DV |
521 | dev->vblank = drmm_kcalloc(dev, num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
522 | if (!dev->vblank) | |
523 | return -ENOMEM; | |
524 | ||
3ed4351a DV |
525 | dev->num_crtcs = num_crtcs; |
526 | ||
3ed4351a DV |
527 | for (i = 0; i < num_crtcs; i++) { |
528 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; | |
529 | ||
530 | vblank->dev = dev; | |
531 | vblank->pipe = i; | |
532 | init_waitqueue_head(&vblank->queue); | |
e99e88a9 | 533 | timer_setup(&vblank->disable_timer, vblank_disable_fn, 0); |
3ed4351a | 534 | seqlock_init(&vblank->seqlock); |
a7e5e06d LP |
535 | |
536 | ret = drmm_add_action_or_reset(dev, drm_vblank_init_release, | |
537 | vblank); | |
538 | if (ret) | |
539 | return ret; | |
5e6c2b4f LP |
540 | |
541 | ret = drm_vblank_worker_init(vblank); | |
542 | if (ret) | |
543 | return ret; | |
3ed4351a DV |
544 | } |
545 | ||
3ed4351a | 546 | return 0; |
3ed4351a DV |
547 | } |
548 | EXPORT_SYMBOL(drm_vblank_init); | |
549 | ||
7beb691f TZ |
550 | /** |
551 | * drm_dev_has_vblank - test if vblanking has been initialized for | |
552 | * a device | |
553 | * @dev: the device | |
554 | * | |
555 | * Drivers may call this function to test if vblank support is | |
556 | * initialized for a device. For most hardware this means that vblanking | |
557 | * can also be enabled. | |
558 | * | |
559 | * Atomic helpers use this function to initialize | |
560 | * &drm_crtc_state.no_vblank. See also drm_atomic_helper_check_modeset(). | |
561 | * | |
562 | * Returns: | |
563 | * True if vblanking has been initialized for the given device, false | |
564 | * otherwise. | |
565 | */ | |
566 | bool drm_dev_has_vblank(const struct drm_device *dev) | |
567 | { | |
568 | return dev->num_crtcs != 0; | |
569 | } | |
570 | EXPORT_SYMBOL(drm_dev_has_vblank); | |
571 | ||
3ed4351a DV |
572 | /** |
573 | * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC | |
574 | * @crtc: which CRTC's vblank waitqueue to retrieve | |
575 | * | |
576 | * This function returns a pointer to the vblank waitqueue for the CRTC. | |
577 | * Drivers can use this to implement vblank waits using wait_event() and related | |
578 | * functions. | |
579 | */ | |
580 | wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc) | |
581 | { | |
582 | return &crtc->dev->vblank[drm_crtc_index(crtc)].queue; | |
583 | } | |
584 | EXPORT_SYMBOL(drm_crtc_vblank_waitqueue); | |
585 | ||
586 | ||
587 | /** | |
588 | * drm_calc_timestamping_constants - calculate vblank timestamp constants | |
589 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
590 | * @mode: display mode containing the scanout timings | |
591 | * | |
57d30230 DV |
592 | * Calculate and store various constants which are later needed by vblank and |
593 | * swap-completion timestamping, e.g, by | |
7fe3f0d1 TZ |
594 | * drm_crtc_vblank_helper_get_vblank_timestamp(). They are derived from |
595 | * CRTC's true scanout timing, so they take things like panel scaling or | |
596 | * other adjustments into account. | |
3ed4351a DV |
597 | */ |
598 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, | |
599 | const struct drm_display_mode *mode) | |
600 | { | |
601 | struct drm_device *dev = crtc->dev; | |
602 | unsigned int pipe = drm_crtc_index(crtc); | |
603 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
604 | int linedur_ns = 0, framedur_ns = 0; | |
605 | int dotclock = mode->crtc_clock; | |
606 | ||
6015002e | 607 | if (!drm_dev_has_vblank(dev)) |
3ed4351a DV |
608 | return; |
609 | ||
5a4784f4 | 610 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
611 | return; |
612 | ||
613 | /* Valid dotclock? */ | |
614 | if (dotclock > 0) { | |
615 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; | |
616 | ||
617 | /* | |
618 | * Convert scanline length in pixels and video | |
619 | * dot clock to line duration and frame duration | |
620 | * in nanoseconds: | |
621 | */ | |
622 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
623 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
624 | ||
625 | /* | |
626 | * Fields of interlaced scanout modes are only half a frame duration. | |
627 | */ | |
628 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
629 | framedur_ns /= 2; | |
02149a76 SR |
630 | } else { |
631 | drm_err(dev, "crtc %u: Can't calculate constants, dotclock = 0!\n", | |
632 | crtc->base.id); | |
633 | } | |
3ed4351a DV |
634 | |
635 | vblank->linedur_ns = linedur_ns; | |
636 | vblank->framedur_ns = framedur_ns; | |
a3342f4d | 637 | drm_mode_copy(&vblank->hwmode, mode); |
3ed4351a | 638 | |
02149a76 SR |
639 | drm_dbg_core(dev, |
640 | "crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
641 | crtc->base.id, mode->crtc_htotal, | |
642 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
643 | drm_dbg_core(dev, "crtc %u: clock %d kHz framedur %d linedur %d\n", | |
644 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
3ed4351a DV |
645 | } |
646 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
647 | ||
f1e2b637 TZ |
648 | /** |
649 | * drm_crtc_vblank_helper_get_vblank_timestamp_internal - precise vblank | |
650 | * timestamp helper | |
099d705d | 651 | * @crtc: CRTC whose vblank timestamp to retrieve |
f1e2b637 TZ |
652 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
653 | * On return contains true maximum error of timestamp | |
654 | * @vblank_time: Pointer to time which should receive the timestamp | |
655 | * @in_vblank_irq: | |
656 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
657 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
658 | * if flag is set. | |
659 | * @get_scanout_position: | |
660 | * Callback function to retrieve the scanout position. See | |
661 | * @struct drm_crtc_helper_funcs.get_scanout_position. | |
f1e2b637 TZ |
662 | * |
663 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
664 | * timings and current video scanout position of a CRTC. | |
665 | * | |
666 | * The current implementation only handles standard video modes. For double scan | |
667 | * and interlaced modes the driver is supposed to adjust the hardware mode | |
668 | * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to | |
669 | * match the scanout position reported. | |
670 | * | |
671 | * Note that atomic drivers must call drm_calc_timestamping_constants() before | |
672 | * enabling a CRTC. The atomic helpers already take care of that in | |
441959eb | 673 | * drm_atomic_helper_calc_timestamping_constants(). |
f1e2b637 TZ |
674 | * |
675 | * Returns: | |
676 | * | |
677 | * Returns true on success, and false on failure, i.e. when no accurate | |
678 | * timestamp could be acquired. | |
679 | */ | |
680 | bool | |
681 | drm_crtc_vblank_helper_get_vblank_timestamp_internal( | |
682 | struct drm_crtc *crtc, int *max_error, ktime_t *vblank_time, | |
683 | bool in_vblank_irq, | |
48e67807 | 684 | drm_vblank_get_scanout_position_func get_scanout_position) |
f1e2b637 TZ |
685 | { |
686 | struct drm_device *dev = crtc->dev; | |
687 | unsigned int pipe = crtc->index; | |
688 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
689 | struct timespec64 ts_etime, ts_vblank_time; | |
690 | ktime_t stime, etime; | |
691 | bool vbl_status; | |
692 | const struct drm_display_mode *mode; | |
693 | int vpos, hpos, i; | |
694 | int delta_ns, duration_ns; | |
695 | ||
696 | if (pipe >= dev->num_crtcs) { | |
02149a76 | 697 | drm_err(dev, "Invalid crtc %u\n", pipe); |
3ed4351a DV |
698 | return false; |
699 | } | |
700 | ||
701 | /* Scanout position query not supported? Should not happen. */ | |
48e67807 | 702 | if (!get_scanout_position) { |
02149a76 | 703 | drm_err(dev, "Called from CRTC w/o get_scanout_position()!?\n"); |
3ed4351a DV |
704 | return false; |
705 | } | |
706 | ||
707 | if (drm_drv_uses_atomic_modeset(dev)) | |
708 | mode = &vblank->hwmode; | |
709 | else | |
710 | mode = &crtc->hwmode; | |
711 | ||
712 | /* If mode timing undefined, just return as no-op: | |
713 | * Happens during initial modesetting of a crtc. | |
714 | */ | |
715 | if (mode->crtc_clock == 0) { | |
02149a76 SR |
716 | drm_dbg_core(dev, "crtc %u: Noop due to uninitialized mode.\n", |
717 | pipe); | |
5a4784f4 | 718 | drm_WARN_ON_ONCE(dev, drm_drv_uses_atomic_modeset(dev)); |
3ed4351a DV |
719 | return false; |
720 | } | |
721 | ||
722 | /* Get current scanout position with system timestamp. | |
723 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
724 | * if single query takes longer than max_error nanoseconds. | |
725 | * | |
726 | * This guarantees a tight bound on maximum error if | |
727 | * code gets preempted or delayed for some reason. | |
728 | */ | |
729 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
730 | /* | |
731 | * Get vertical and horizontal scanout position vpos, hpos, | |
732 | * and bounding timestamps stime, etime, pre/post query. | |
733 | */ | |
48e67807 TZ |
734 | vbl_status = get_scanout_position(crtc, in_vblank_irq, |
735 | &vpos, &hpos, | |
736 | &stime, &etime, | |
737 | mode); | |
3ed4351a DV |
738 | |
739 | /* Return as no-op if scanout query unsupported or failed. */ | |
740 | if (!vbl_status) { | |
02149a76 SR |
741 | drm_dbg_core(dev, |
742 | "crtc %u : scanoutpos query failed.\n", | |
743 | pipe); | |
3ed4351a DV |
744 | return false; |
745 | } | |
746 | ||
747 | /* Compute uncertainty in timestamp of scanout position query. */ | |
748 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); | |
749 | ||
750 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
751 | if (duration_ns <= *max_error) | |
752 | break; | |
753 | } | |
754 | ||
755 | /* Noisy system timing? */ | |
756 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
02149a76 SR |
757 | drm_dbg_core(dev, |
758 | "crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", | |
759 | pipe, duration_ns / 1000, *max_error / 1000, i); | |
3ed4351a DV |
760 | } |
761 | ||
762 | /* Return upper bound of timestamp precision error. */ | |
763 | *max_error = duration_ns; | |
764 | ||
765 | /* Convert scanout position into elapsed time at raw_time query | |
766 | * since start of scanout at first display scanline. delta_ns | |
767 | * can be negative if start of scanout hasn't happened yet. | |
768 | */ | |
769 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), | |
770 | mode->crtc_clock); | |
771 | ||
3ed4351a DV |
772 | /* Subtract time delta from raw timestamp to get final |
773 | * vblank_time timestamp for end of vblank. | |
774 | */ | |
bcbec31c VS |
775 | *vblank_time = ktime_sub_ns(etime, delta_ns); |
776 | ||
f0a8f533 | 777 | if (!drm_debug_enabled(DRM_UT_VBL)) |
bcbec31c VS |
778 | return true; |
779 | ||
780 | ts_etime = ktime_to_timespec64(etime); | |
781 | ts_vblank_time = ktime_to_timespec64(*vblank_time); | |
3ed4351a | 782 | |
02149a76 SR |
783 | drm_dbg_vbl(dev, |
784 | "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n", | |
785 | pipe, hpos, vpos, | |
786 | (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000, | |
787 | (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, | |
788 | duration_ns / 1000, i); | |
3ed4351a DV |
789 | |
790 | return true; | |
791 | } | |
f1e2b637 | 792 | EXPORT_SYMBOL(drm_crtc_vblank_helper_get_vblank_timestamp_internal); |
3ed4351a | 793 | |
7fe3f0d1 TZ |
794 | /** |
795 | * drm_crtc_vblank_helper_get_vblank_timestamp - precise vblank timestamp | |
796 | * helper | |
797 | * @crtc: CRTC whose vblank timestamp to retrieve | |
798 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
799 | * On return contains true maximum error of timestamp | |
800 | * @vblank_time: Pointer to time which should receive the timestamp | |
801 | * @in_vblank_irq: | |
802 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
803 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
804 | * if flag is set. | |
805 | * | |
806 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
807 | * timings and current video scanout position of a CRTC. This can be directly | |
808 | * used as the &drm_crtc_funcs.get_vblank_timestamp implementation of a kms | |
809 | * driver if &drm_crtc_helper_funcs.get_scanout_position is implemented. | |
810 | * | |
811 | * The current implementation only handles standard video modes. For double scan | |
812 | * and interlaced modes the driver is supposed to adjust the hardware mode | |
813 | * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to | |
814 | * match the scanout position reported. | |
815 | * | |
816 | * Note that atomic drivers must call drm_calc_timestamping_constants() before | |
817 | * enabling a CRTC. The atomic helpers already take care of that in | |
441959eb | 818 | * drm_atomic_helper_calc_timestamping_constants(). |
7fe3f0d1 TZ |
819 | * |
820 | * Returns: | |
821 | * | |
822 | * Returns true on success, and false on failure, i.e. when no accurate | |
823 | * timestamp could be acquired. | |
824 | */ | |
825 | bool drm_crtc_vblank_helper_get_vblank_timestamp(struct drm_crtc *crtc, | |
826 | int *max_error, | |
827 | ktime_t *vblank_time, | |
828 | bool in_vblank_irq) | |
829 | { | |
830 | return drm_crtc_vblank_helper_get_vblank_timestamp_internal( | |
831 | crtc, max_error, vblank_time, in_vblank_irq, | |
48e67807 | 832 | crtc->helper_private->get_scanout_position); |
7fe3f0d1 TZ |
833 | } |
834 | EXPORT_SYMBOL(drm_crtc_vblank_helper_get_vblank_timestamp); | |
835 | ||
3ed4351a | 836 | /** |
b2c077d0 RC |
837 | * drm_crtc_get_last_vbltimestamp - retrieve raw timestamp for the most |
838 | * recent vblank interval | |
839 | * @crtc: CRTC whose vblank timestamp to retrieve | |
67680d3c | 840 | * @tvblank: Pointer to target time which should receive the timestamp |
3ed4351a DV |
841 | * @in_vblank_irq: |
842 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
843 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
844 | * if flag is set. | |
845 | * | |
846 | * Fetches the system timestamp corresponding to the time of the most recent | |
847 | * vblank interval on specified CRTC. May call into kms-driver to | |
848 | * compute the timestamp with a high-precision GPU specific method. | |
849 | * | |
850 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
851 | * call, i.e., it isn't very precisely locked to the true vblank. | |
852 | * | |
853 | * Returns: | |
854 | * True if timestamp is considered to be very precise, false otherwise. | |
855 | */ | |
856 | static bool | |
b2c077d0 RC |
857 | drm_crtc_get_last_vbltimestamp(struct drm_crtc *crtc, ktime_t *tvblank, |
858 | bool in_vblank_irq) | |
3ed4351a DV |
859 | { |
860 | bool ret = false; | |
861 | ||
862 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
863 | int max_error = (int) drm_timestamp_precision * 1000; | |
864 | ||
865 | /* Query driver if possible and precision timestamping enabled. */ | |
7fe3f0d1 | 866 | if (crtc && crtc->funcs->get_vblank_timestamp && max_error > 0) { |
7fe3f0d1 TZ |
867 | ret = crtc->funcs->get_vblank_timestamp(crtc, &max_error, |
868 | tvblank, in_vblank_irq); | |
7fe3f0d1 | 869 | } |
3ed4351a DV |
870 | |
871 | /* GPU high precision timestamp query unsupported or failed. | |
872 | * Return current monotonic/gettimeofday timestamp as best estimate. | |
873 | */ | |
874 | if (!ret) | |
25e1a798 | 875 | *tvblank = ktime_get(); |
3ed4351a DV |
876 | |
877 | return ret; | |
878 | } | |
879 | ||
b2c077d0 RC |
880 | static bool |
881 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
882 | ktime_t *tvblank, bool in_vblank_irq) | |
883 | { | |
884 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
885 | ||
886 | return drm_crtc_get_last_vbltimestamp(crtc, tvblank, in_vblank_irq); | |
887 | } | |
888 | ||
3ed4351a DV |
889 | /** |
890 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
891 | * @crtc: which counter to retrieve | |
892 | * | |
893 | * Fetches the "cooked" vblank count value that represents the number of | |
894 | * vblank events since the system was booted, including lost events due to | |
57d30230 DV |
895 | * modesetting activity. Note that this timer isn't correct against a racing |
896 | * vblank interrupt (since it only reports the software vblank counter), see | |
ca814b25 | 897 | * drm_crtc_accurate_vblank_count() for such use-cases. |
3ed4351a | 898 | * |
bd7e3f3b DV |
899 | * Note that for a given vblank counter value drm_crtc_handle_vblank() |
900 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() | |
901 | * provide a barrier: Any writes done before calling | |
902 | * drm_crtc_handle_vblank() will be visible to callers of the later | |
0ae865ef | 903 | * functions, if the vblank count is the same or a later one. |
bd7e3f3b DV |
904 | * |
905 | * See also &drm_vblank_crtc.count. | |
906 | * | |
3ed4351a DV |
907 | * Returns: |
908 | * The software vblank counter. | |
909 | */ | |
570e8696 | 910 | u64 drm_crtc_vblank_count(struct drm_crtc *crtc) |
3ed4351a DV |
911 | { |
912 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
913 | } | |
914 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
915 | ||
570e8696 KP |
916 | /** |
917 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the | |
918 | * system timestamp corresponding to that vblank counter value. | |
919 | * @dev: DRM device | |
920 | * @pipe: index of CRTC whose counter to retrieve | |
921 | * @vblanktime: Pointer to ktime_t to receive the vblank timestamp. | |
922 | * | |
923 | * Fetches the "cooked" vblank count value that represents the number of | |
924 | * vblank events since the system was booted, including lost events due to | |
925 | * modesetting activity. Returns corresponding system timestamp of the time | |
926 | * of the vblank interval that corresponds to the current vblank counter value. | |
927 | * | |
928 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
929 | */ | |
930 | static u64 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 931 | ktime_t *vblanktime) |
3ed4351a DV |
932 | { |
933 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
570e8696 | 934 | u64 vblank_count; |
3ed4351a DV |
935 | unsigned int seq; |
936 | ||
5a4784f4 | 937 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) { |
67680d3c | 938 | *vblanktime = 0; |
3ed4351a DV |
939 | return 0; |
940 | } | |
941 | ||
942 | do { | |
943 | seq = read_seqbegin(&vblank->seqlock); | |
bd7e3f3b | 944 | vblank_count = atomic64_read(&vblank->count); |
3ed4351a DV |
945 | *vblanktime = vblank->time; |
946 | } while (read_seqretry(&vblank->seqlock, seq)); | |
947 | ||
948 | return vblank_count; | |
949 | } | |
950 | ||
951 | /** | |
952 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
953 | * and the system timestamp corresponding to that vblank counter value | |
954 | * @crtc: which counter to retrieve | |
67680d3c | 955 | * @vblanktime: Pointer to time to receive the vblank timestamp. |
3ed4351a DV |
956 | * |
957 | * Fetches the "cooked" vblank count value that represents the number of | |
958 | * vblank events since the system was booted, including lost events due to | |
959 | * modesetting activity. Returns corresponding system timestamp of the time | |
960 | * of the vblank interval that corresponds to the current vblank counter value. | |
bd7e3f3b DV |
961 | * |
962 | * Note that for a given vblank counter value drm_crtc_handle_vblank() | |
963 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() | |
964 | * provide a barrier: Any writes done before calling | |
965 | * drm_crtc_handle_vblank() will be visible to callers of the later | |
0ae865ef | 966 | * functions, if the vblank count is the same or a later one. |
bd7e3f3b DV |
967 | * |
968 | * See also &drm_vblank_crtc.count. | |
3ed4351a | 969 | */ |
570e8696 | 970 | u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, |
67680d3c | 971 | ktime_t *vblanktime) |
3ed4351a DV |
972 | { |
973 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
974 | vblanktime); | |
975 | } | |
976 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
977 | ||
b2c077d0 RC |
978 | /** |
979 | * drm_crtc_next_vblank_start - calculate the time of the next vblank | |
980 | * @crtc: the crtc for which to calculate next vblank time | |
981 | * @vblanktime: pointer to time to receive the next vblank timestamp. | |
982 | * | |
983 | * Calculate the expected time of the start of the next vblank period, | |
984 | * based on time of previous vblank and frame duration | |
985 | */ | |
986 | int drm_crtc_next_vblank_start(struct drm_crtc *crtc, ktime_t *vblanktime) | |
987 | { | |
988 | unsigned int pipe = drm_crtc_index(crtc); | |
6f1ccbf0 RC |
989 | struct drm_vblank_crtc *vblank; |
990 | struct drm_display_mode *mode; | |
b2c077d0 RC |
991 | u64 vblank_start; |
992 | ||
6f1ccbf0 RC |
993 | if (!drm_dev_has_vblank(crtc->dev)) |
994 | return -EINVAL; | |
995 | ||
996 | vblank = &crtc->dev->vblank[pipe]; | |
997 | mode = &vblank->hwmode; | |
998 | ||
b2c077d0 RC |
999 | if (!vblank->framedur_ns || !vblank->linedur_ns) |
1000 | return -EINVAL; | |
1001 | ||
1002 | if (!drm_crtc_get_last_vbltimestamp(crtc, vblanktime, false)) | |
1003 | return -EINVAL; | |
1004 | ||
1005 | vblank_start = DIV_ROUND_DOWN_ULL( | |
1006 | (u64)vblank->framedur_ns * mode->crtc_vblank_start, | |
1007 | mode->crtc_vtotal); | |
1008 | *vblanktime = ktime_add(*vblanktime, ns_to_ktime(vblank_start)); | |
1009 | ||
1010 | return 0; | |
1011 | } | |
1012 | EXPORT_SYMBOL(drm_crtc_next_vblank_start); | |
1013 | ||
3ed4351a DV |
1014 | static void send_vblank_event(struct drm_device *dev, |
1015 | struct drm_pending_vblank_event *e, | |
570e8696 | 1016 | u64 seq, ktime_t now) |
3ed4351a | 1017 | { |
bd386e51 | 1018 | struct timespec64 tv; |
3ed4351a | 1019 | |
bd386e51 KP |
1020 | switch (e->event.base.type) { |
1021 | case DRM_EVENT_VBLANK: | |
1022 | case DRM_EVENT_FLIP_COMPLETE: | |
1023 | tv = ktime_to_timespec64(now); | |
1024 | e->event.vbl.sequence = seq; | |
1025 | /* | |
1026 | * e->event is a user space structure, with hardcoded unsigned | |
1027 | * 32-bit seconds/microseconds. This is safe as we always use | |
1028 | * monotonic timestamps since linux-4.15 | |
1029 | */ | |
1030 | e->event.vbl.tv_sec = tv.tv_sec; | |
1031 | e->event.vbl.tv_usec = tv.tv_nsec / 1000; | |
1032 | break; | |
3064abfa KP |
1033 | case DRM_EVENT_CRTC_SEQUENCE: |
1034 | if (seq) | |
1035 | e->event.seq.sequence = seq; | |
1036 | e->event.seq.time_ns = ktime_to_ns(now); | |
1037 | break; | |
bd386e51 KP |
1038 | } |
1039 | trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, seq); | |
a78e7a51 VSS |
1040 | /* |
1041 | * Use the same timestamp for any associated fence signal to avoid | |
1042 | * mismatch in timestamps for vsync & fence events triggered by the | |
1043 | * same HW event. Frameworks like SurfaceFlinger in Android expects the | |
1044 | * retire-fence timestamp to match exactly with HW vsync as it uses it | |
1045 | * for its software vsync modeling. | |
1046 | */ | |
1047 | drm_send_event_timestamp_locked(dev, &e->base, now); | |
3ed4351a DV |
1048 | } |
1049 | ||
1050 | /** | |
1051 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip | |
1052 | * @crtc: the source CRTC of the vblank event | |
1053 | * @e: the event to send | |
1054 | * | |
1055 | * A lot of drivers need to generate vblank events for the very next vblank | |
1056 | * interrupt. For example when the page flip interrupt happens when the page | |
1057 | * flip gets armed, but not when it actually executes within the next vblank | |
1058 | * period. This helper function implements exactly the required vblank arming | |
1059 | * behaviour. | |
1060 | * | |
1061 | * NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an | |
1062 | * atomic commit must ensure that the next vblank happens at exactly the same | |
1063 | * time as the atomic commit is committed to the hardware. This function itself | |
e13a0583 | 1064 | * does **not** protect against the next vblank interrupt racing with either this |
3ed4351a DV |
1065 | * function call or the atomic commit operation. A possible sequence could be: |
1066 | * | |
1067 | * 1. Driver commits new hardware state into vblank-synchronized registers. | |
1068 | * 2. A vblank happens, committing the hardware state. Also the corresponding | |
1069 | * vblank interrupt is fired off and fully processed by the interrupt | |
1070 | * handler. | |
1071 | * 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event(). | |
1072 | * 4. The event is only send out for the next vblank, which is wrong. | |
1073 | * | |
1074 | * An equivalent race can happen when the driver calls | |
1075 | * drm_crtc_arm_vblank_event() before writing out the new hardware state. | |
1076 | * | |
1077 | * The only way to make this work safely is to prevent the vblank from firing | |
1078 | * (and the hardware from committing anything else) until the entire atomic | |
1079 | * commit sequence has run to completion. If the hardware does not have such a | |
1080 | * feature (e.g. using a "go" bit), then it is unsafe to use this functions. | |
1081 | * Instead drivers need to manually send out the event from their interrupt | |
1082 | * handler by calling drm_crtc_send_vblank_event() and make sure that there's no | |
1083 | * possible race with the hardware committing the atomic update. | |
1084 | * | |
e750218d SA |
1085 | * Caller must hold a vblank reference for the event @e acquired by a |
1086 | * drm_crtc_vblank_get(), which will be dropped when the next vblank arrives. | |
3ed4351a DV |
1087 | */ |
1088 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, | |
1089 | struct drm_pending_vblank_event *e) | |
1090 | { | |
1091 | struct drm_device *dev = crtc->dev; | |
1092 | unsigned int pipe = drm_crtc_index(crtc); | |
1093 | ||
1094 | assert_spin_locked(&dev->event_lock); | |
1095 | ||
1096 | e->pipe = pipe; | |
570e8696 | 1097 | e->sequence = drm_crtc_accurate_vblank_count(crtc) + 1; |
3ed4351a DV |
1098 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
1099 | } | |
1100 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); | |
1101 | ||
1102 | /** | |
1103 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
1104 | * @crtc: the source CRTC of the vblank event | |
1105 | * @e: the event to send | |
1106 | * | |
1107 | * Updates sequence # and timestamp on event for the most recently processed | |
1108 | * vblank, and sends it to userspace. Caller must hold event lock. | |
1109 | * | |
1110 | * See drm_crtc_arm_vblank_event() for a helper which can be used in certain | |
1111 | * situation, especially to send out events for atomic commit operations. | |
1112 | */ | |
1113 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
1114 | struct drm_pending_vblank_event *e) | |
1115 | { | |
1116 | struct drm_device *dev = crtc->dev; | |
570e8696 KP |
1117 | u64 seq; |
1118 | unsigned int pipe = drm_crtc_index(crtc); | |
67680d3c | 1119 | ktime_t now; |
3ed4351a | 1120 | |
6015002e | 1121 | if (drm_dev_has_vblank(dev)) { |
3ed4351a DV |
1122 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1123 | } else { | |
1124 | seq = 0; | |
1125 | ||
25e1a798 | 1126 | now = ktime_get(); |
3ed4351a DV |
1127 | } |
1128 | e->pipe = pipe; | |
67680d3c | 1129 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1130 | } |
1131 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
1132 | ||
1133 | static int __enable_vblank(struct drm_device *dev, unsigned int pipe) | |
1134 | { | |
1135 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1136 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
1137 | ||
5a4784f4 | 1138 | if (drm_WARN_ON(dev, !crtc)) |
4ffb8dee JM |
1139 | return 0; |
1140 | ||
3ed4351a DV |
1141 | if (crtc->funcs->enable_vblank) |
1142 | return crtc->funcs->enable_vblank(crtc); | |
57bb1ee6 | 1143 | } |
3ed4351a | 1144 | |
f397d66b | 1145 | return -EINVAL; |
3ed4351a DV |
1146 | } |
1147 | ||
3ed4351a DV |
1148 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
1149 | { | |
1150 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1151 | int ret = 0; | |
1152 | ||
1153 | assert_spin_locked(&dev->vbl_lock); | |
1154 | ||
1155 | spin_lock(&dev->vblank_time_lock); | |
1156 | ||
1157 | if (!vblank->enabled) { | |
1158 | /* | |
1159 | * Enable vblank irqs under vblank_time_lock protection. | |
1160 | * All vblank count & timestamp updates are held off | |
1161 | * until we are done reinitializing master counter and | |
1162 | * timestamps. Filtercode in drm_handle_vblank() will | |
1163 | * prevent double-accounting of same vblank interval. | |
1164 | */ | |
1165 | ret = __enable_vblank(dev, pipe); | |
02149a76 SR |
1166 | drm_dbg_core(dev, "enabling vblank on crtc %u, ret: %d\n", |
1167 | pipe, ret); | |
3ed4351a DV |
1168 | if (ret) { |
1169 | atomic_dec(&vblank->refcount); | |
1170 | } else { | |
1171 | drm_update_vblank_count(dev, pipe, 0); | |
1172 | /* drm_update_vblank_count() includes a wmb so we just | |
1173 | * need to ensure that the compiler emits the write | |
1174 | * to mark the vblank as enabled after the call | |
1175 | * to drm_update_vblank_count(). | |
1176 | */ | |
1177 | WRITE_ONCE(vblank->enabled, true); | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | spin_unlock(&dev->vblank_time_lock); | |
1182 | ||
1183 | return ret; | |
1184 | } | |
1185 | ||
5e6c2b4f | 1186 | int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
3ed4351a DV |
1187 | { |
1188 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1189 | unsigned long irqflags; | |
1190 | int ret = 0; | |
1191 | ||
6015002e | 1192 | if (!drm_dev_has_vblank(dev)) |
3ed4351a DV |
1193 | return -EINVAL; |
1194 | ||
5a4784f4 | 1195 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1196 | return -EINVAL; |
1197 | ||
1198 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1199 | /* Going from 0->1 means we have to enable interrupts again */ | |
1200 | if (atomic_add_return(1, &vblank->refcount) == 1) { | |
1201 | ret = drm_vblank_enable(dev, pipe); | |
1202 | } else { | |
1203 | if (!vblank->enabled) { | |
1204 | atomic_dec(&vblank->refcount); | |
1205 | ret = -EINVAL; | |
1206 | } | |
1207 | } | |
1208 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1209 | ||
1210 | return ret; | |
1211 | } | |
1212 | ||
1213 | /** | |
1214 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1215 | * @crtc: which CRTC to own | |
1216 | * | |
1217 | * Acquire a reference count on vblank events to avoid having them disabled | |
1218 | * while in use. | |
1219 | * | |
1220 | * Returns: | |
1221 | * Zero on success or a negative error code on failure. | |
1222 | */ | |
1223 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1224 | { | |
1225 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1226 | } | |
1227 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1228 | ||
5e6c2b4f | 1229 | void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
3ed4351a DV |
1230 | { |
1231 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1232 | ||
5a4784f4 | 1233 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1234 | return; |
1235 | ||
5a4784f4 | 1236 | if (drm_WARN_ON(dev, atomic_read(&vblank->refcount) == 0)) |
3ed4351a DV |
1237 | return; |
1238 | ||
1239 | /* Last user schedules interrupt disable */ | |
1240 | if (atomic_dec_and_test(&vblank->refcount)) { | |
1241 | if (drm_vblank_offdelay == 0) | |
1242 | return; | |
1243 | else if (drm_vblank_offdelay < 0) | |
e99e88a9 | 1244 | vblank_disable_fn(&vblank->disable_timer); |
3ed4351a DV |
1245 | else if (!dev->vblank_disable_immediate) |
1246 | mod_timer(&vblank->disable_timer, | |
1247 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1248 | } | |
1249 | } | |
1250 | ||
1251 | /** | |
1252 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1253 | * @crtc: which counter to give up | |
1254 | * | |
1255 | * Release ownership of a given vblank counter, turning off interrupts | |
1256 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1257 | */ | |
1258 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1259 | { | |
1260 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1261 | } | |
1262 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1263 | ||
1264 | /** | |
1265 | * drm_wait_one_vblank - wait for one vblank | |
1266 | * @dev: DRM device | |
1267 | * @pipe: CRTC index | |
1268 | * | |
1269 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. | |
1270 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
1271 | * due to lack of driver support or because the crtc is off. | |
57d30230 DV |
1272 | * |
1273 | * This is the legacy version of drm_crtc_wait_one_vblank(). | |
3ed4351a DV |
1274 | */ |
1275 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) | |
1276 | { | |
1277 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1278 | int ret; | |
3b765c0b | 1279 | u64 last; |
3ed4351a | 1280 | |
5a4784f4 | 1281 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1282 | return; |
1283 | ||
1284 | ret = drm_vblank_get(dev, pipe); | |
5a4784f4 SR |
1285 | if (drm_WARN(dev, ret, "vblank not available on crtc %i, ret=%i\n", |
1286 | pipe, ret)) | |
3ed4351a DV |
1287 | return; |
1288 | ||
1289 | last = drm_vblank_count(dev, pipe); | |
1290 | ||
1291 | ret = wait_event_timeout(vblank->queue, | |
1292 | last != drm_vblank_count(dev, pipe), | |
1293 | msecs_to_jiffies(100)); | |
1294 | ||
5a4784f4 | 1295 | drm_WARN(dev, ret == 0, "vblank wait timed out on crtc %i\n", pipe); |
3ed4351a DV |
1296 | |
1297 | drm_vblank_put(dev, pipe); | |
1298 | } | |
1299 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1300 | ||
1301 | /** | |
1302 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1303 | * @crtc: DRM crtc | |
1304 | * | |
1305 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1306 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1307 | * due to lack of driver support or because the crtc is off. | |
1308 | */ | |
1309 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1310 | { | |
1311 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1312 | } | |
1313 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1314 | ||
1315 | /** | |
1316 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1317 | * @crtc: CRTC in question | |
1318 | * | |
1319 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1320 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1321 | * stored so that drm_vblank_on can restore it again. | |
1322 | * | |
1323 | * Drivers must use this function when the hardware vblank counter can get | |
57d30230 | 1324 | * reset, e.g. when suspending or disabling the @crtc in general. |
3ed4351a DV |
1325 | */ |
1326 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1327 | { | |
1328 | struct drm_device *dev = crtc->dev; | |
1329 | unsigned int pipe = drm_crtc_index(crtc); | |
1330 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1331 | struct drm_pending_vblank_event *e, *t; | |
67680d3c | 1332 | ktime_t now; |
570e8696 | 1333 | u64 seq; |
3ed4351a | 1334 | |
5a4784f4 | 1335 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1336 | return; |
1337 | ||
5e6c2b4f LP |
1338 | /* |
1339 | * Grab event_lock early to prevent vblank work from being scheduled | |
1340 | * while we're in the middle of shutting down vblank interrupts | |
1341 | */ | |
a7e3ad5f | 1342 | spin_lock_irq(&dev->event_lock); |
3ed4351a DV |
1343 | |
1344 | spin_lock(&dev->vbl_lock); | |
02149a76 SR |
1345 | drm_dbg_vbl(dev, "crtc %d, vblank enabled %d, inmodeset %d\n", |
1346 | pipe, vblank->enabled, vblank->inmodeset); | |
3ed4351a DV |
1347 | |
1348 | /* Avoid redundant vblank disables without previous | |
1349 | * drm_crtc_vblank_on(). */ | |
1350 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) | |
1351 | drm_vblank_disable_and_save(dev, pipe); | |
1352 | ||
1353 | wake_up(&vblank->queue); | |
1354 | ||
1355 | /* | |
1356 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1357 | * the vblank interrupt by bumping the refcount. | |
1358 | */ | |
1359 | if (!vblank->inmodeset) { | |
1360 | atomic_inc(&vblank->refcount); | |
1361 | vblank->inmodeset = 1; | |
1362 | } | |
1363 | spin_unlock(&dev->vbl_lock); | |
1364 | ||
1365 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
1366 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1367 | ||
1368 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1369 | if (e->pipe != pipe) | |
1370 | continue; | |
02149a76 SR |
1371 | drm_dbg_core(dev, "Sending premature vblank event on disable: " |
1372 | "wanted %llu, current %llu\n", | |
1373 | e->sequence, seq); | |
3ed4351a DV |
1374 | list_del(&e->base.link); |
1375 | drm_vblank_put(dev, pipe); | |
67680d3c | 1376 | send_vblank_event(dev, e, seq, now); |
3ed4351a | 1377 | } |
5e6c2b4f LP |
1378 | |
1379 | /* Cancel any leftover pending vblank work */ | |
1380 | drm_vblank_cancel_pending_works(vblank); | |
1381 | ||
a7e3ad5f | 1382 | spin_unlock_irq(&dev->event_lock); |
3ed4351a DV |
1383 | |
1384 | /* Will be reset by the modeset helpers when re-enabling the crtc by | |
1385 | * calling drm_calc_timestamping_constants(). */ | |
1386 | vblank->hwmode.crtc_clock = 0; | |
5e6c2b4f LP |
1387 | |
1388 | /* Wait for any vblank work that's still executing to finish */ | |
1389 | drm_vblank_flush_worker(vblank); | |
3ed4351a DV |
1390 | } |
1391 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1392 | ||
1393 | /** | |
1394 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
1395 | * @crtc: CRTC in question | |
1396 | * | |
1397 | * Drivers can use this function to reset the vblank state to off at load time. | |
1398 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1399 | * drm_crtc_vblank_on() functions. The difference compared to | |
1400 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1401 | * and hence doesn't need to call any driver hooks. | |
57d30230 DV |
1402 | * |
1403 | * This is useful for recovering driver state e.g. on driver load, or on resume. | |
3ed4351a DV |
1404 | */ |
1405 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) | |
1406 | { | |
1407 | struct drm_device *dev = crtc->dev; | |
3ed4351a DV |
1408 | unsigned int pipe = drm_crtc_index(crtc); |
1409 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1410 | ||
fbc678e8 | 1411 | spin_lock_irq(&dev->vbl_lock); |
3ed4351a DV |
1412 | /* |
1413 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1414 | * interrupt by bumping the refcount. | |
1415 | */ | |
1416 | if (!vblank->inmodeset) { | |
1417 | atomic_inc(&vblank->refcount); | |
1418 | vblank->inmodeset = 1; | |
1419 | } | |
fbc678e8 | 1420 | spin_unlock_irq(&dev->vbl_lock); |
3ed4351a | 1421 | |
5a4784f4 | 1422 | drm_WARN_ON(dev, !list_empty(&dev->vblank_event_list)); |
5e6c2b4f | 1423 | drm_WARN_ON(dev, !list_empty(&vblank->pending_work)); |
3ed4351a DV |
1424 | } |
1425 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1426 | ||
ed20151a VS |
1427 | /** |
1428 | * drm_crtc_set_max_vblank_count - configure the hw max vblank counter value | |
1429 | * @crtc: CRTC in question | |
1430 | * @max_vblank_count: max hardware vblank counter value | |
1431 | * | |
1432 | * Update the maximum hardware vblank counter value for @crtc | |
1433 | * at runtime. Useful for hardware where the operation of the | |
1434 | * hardware vblank counter depends on the currently active | |
1435 | * display configuration. | |
1436 | * | |
1437 | * For example, if the hardware vblank counter does not work | |
1438 | * when a specific connector is active the maximum can be set | |
1439 | * to zero. And when that specific connector isn't active the | |
1440 | * maximum can again be set to the appropriate non-zero value. | |
1441 | * | |
1442 | * If used, must be called before drm_vblank_on(). | |
1443 | */ | |
1444 | void drm_crtc_set_max_vblank_count(struct drm_crtc *crtc, | |
1445 | u32 max_vblank_count) | |
1446 | { | |
1447 | struct drm_device *dev = crtc->dev; | |
1448 | unsigned int pipe = drm_crtc_index(crtc); | |
1449 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1450 | ||
5a4784f4 SR |
1451 | drm_WARN_ON(dev, dev->max_vblank_count); |
1452 | drm_WARN_ON(dev, !READ_ONCE(vblank->inmodeset)); | |
ed20151a VS |
1453 | |
1454 | vblank->max_vblank_count = max_vblank_count; | |
1455 | } | |
1456 | EXPORT_SYMBOL(drm_crtc_set_max_vblank_count); | |
1457 | ||
3ed4351a DV |
1458 | /** |
1459 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1460 | * @crtc: CRTC in question | |
1461 | * | |
1462 | * This functions restores the vblank interrupt state captured with | |
57d30230 DV |
1463 | * drm_crtc_vblank_off() again and is generally called when enabling @crtc. Note |
1464 | * that calls to drm_crtc_vblank_on() and drm_crtc_vblank_off() can be | |
1465 | * unbalanced and so can also be unconditionally called in driver load code to | |
1466 | * reflect the current hardware state of the crtc. | |
3ed4351a DV |
1467 | */ |
1468 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1469 | { | |
1470 | struct drm_device *dev = crtc->dev; | |
1471 | unsigned int pipe = drm_crtc_index(crtc); | |
1472 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
3ed4351a | 1473 | |
5a4784f4 | 1474 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1475 | return; |
1476 | ||
92cc68e3 | 1477 | spin_lock_irq(&dev->vbl_lock); |
02149a76 SR |
1478 | drm_dbg_vbl(dev, "crtc %d, vblank enabled %d, inmodeset %d\n", |
1479 | pipe, vblank->enabled, vblank->inmodeset); | |
3ed4351a DV |
1480 | |
1481 | /* Drop our private "prevent drm_vblank_get" refcount */ | |
1482 | if (vblank->inmodeset) { | |
1483 | atomic_dec(&vblank->refcount); | |
1484 | vblank->inmodeset = 0; | |
1485 | } | |
1486 | ||
1487 | drm_reset_vblank_timestamp(dev, pipe); | |
1488 | ||
1489 | /* | |
1490 | * re-enable interrupts if there are users left, or the | |
1491 | * user wishes vblank interrupts to be enabled all the time. | |
1492 | */ | |
1493 | if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) | |
5a4784f4 | 1494 | drm_WARN_ON(dev, drm_vblank_enable(dev, pipe)); |
92cc68e3 | 1495 | spin_unlock_irq(&dev->vbl_lock); |
3ed4351a DV |
1496 | } |
1497 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1498 | ||
f66aaab8 | 1499 | static void drm_vblank_restore(struct drm_device *dev, unsigned int pipe) |
d0bb96b4 DP |
1500 | { |
1501 | ktime_t t_vblank; | |
1502 | struct drm_vblank_crtc *vblank; | |
1503 | int framedur_ns; | |
1504 | u64 diff_ns; | |
1505 | u32 cur_vblank, diff = 1; | |
1506 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
167b4002 | 1507 | u32 max_vblank_count = drm_max_vblank_count(dev, pipe); |
d0bb96b4 | 1508 | |
5a4784f4 | 1509 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
d0bb96b4 DP |
1510 | return; |
1511 | ||
1512 | assert_spin_locked(&dev->vbl_lock); | |
1513 | assert_spin_locked(&dev->vblank_time_lock); | |
1514 | ||
1515 | vblank = &dev->vblank[pipe]; | |
5a4784f4 SR |
1516 | drm_WARN_ONCE(dev, |
1517 | drm_debug_enabled(DRM_UT_VBL) && !vblank->framedur_ns, | |
1518 | "Cannot compute missed vblanks without frame duration\n"); | |
d0bb96b4 DP |
1519 | framedur_ns = vblank->framedur_ns; |
1520 | ||
1521 | do { | |
1522 | cur_vblank = __get_vblank_counter(dev, pipe); | |
1523 | drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false); | |
1524 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
1525 | ||
1526 | diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); | |
1527 | if (framedur_ns) | |
1528 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |
1529 | ||
1530 | ||
02149a76 SR |
1531 | drm_dbg_vbl(dev, |
1532 | "missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n", | |
1533 | diff, diff_ns, framedur_ns, cur_vblank - vblank->last); | |
167b4002 | 1534 | vblank->last = (cur_vblank - diff) & max_vblank_count; |
d0bb96b4 | 1535 | } |
d0bb96b4 DP |
1536 | |
1537 | /** | |
ea3f0ef3 DP |
1538 | * drm_crtc_vblank_restore - estimate missed vblanks and update vblank count. |
1539 | * @crtc: CRTC in question | |
1540 | * | |
d0bb96b4 | 1541 | * Power manamement features can cause frame counter resets between vblank |
ea3f0ef3 DP |
1542 | * disable and enable. Drivers can use this function in their |
1543 | * &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since | |
1544 | * the last &drm_crtc_funcs.disable_vblank using timestamps and update the | |
1545 | * vblank counter. | |
f66aaab8 DV |
1546 | * |
1547 | * Note that drivers must have race-free high-precision timestamping support, | |
1548 | * i.e. &drm_crtc_funcs.get_vblank_timestamp must be hooked up and | |
1549 | * &drm_driver.vblank_disable_immediate must be set to indicate the | |
1550 | * time-stamping functions are race-free against vblank hardware counter | |
1551 | * increments. | |
d0bb96b4 DP |
1552 | */ |
1553 | void drm_crtc_vblank_restore(struct drm_crtc *crtc) | |
1554 | { | |
f66aaab8 DV |
1555 | WARN_ON_ONCE(!crtc->funcs->get_vblank_timestamp); |
1556 | WARN_ON_ONCE(!crtc->dev->vblank_disable_immediate); | |
1557 | ||
d0bb96b4 DP |
1558 | drm_vblank_restore(crtc->dev, drm_crtc_index(crtc)); |
1559 | } | |
1560 | EXPORT_SYMBOL(drm_crtc_vblank_restore); | |
1561 | ||
3ed4351a | 1562 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, |
570e8696 | 1563 | u64 req_seq, |
3ed4351a DV |
1564 | union drm_wait_vblank *vblwait, |
1565 | struct drm_file *file_priv) | |
1566 | { | |
1567 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1568 | struct drm_pending_vblank_event *e; | |
67680d3c | 1569 | ktime_t now; |
570e8696 | 1570 | u64 seq; |
3ed4351a DV |
1571 | int ret; |
1572 | ||
1573 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
1574 | if (e == NULL) { | |
1575 | ret = -ENOMEM; | |
1576 | goto err_put; | |
1577 | } | |
1578 | ||
1579 | e->pipe = pipe; | |
1580 | e->event.base.type = DRM_EVENT_VBLANK; | |
bd386e51 KP |
1581 | e->event.base.length = sizeof(e->event.vbl); |
1582 | e->event.vbl.user_data = vblwait->request.signal; | |
1583 | e->event.vbl.crtc_id = 0; | |
1584 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1585 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
948de842 | 1586 | |
bd386e51 KP |
1587 | if (crtc) |
1588 | e->event.vbl.crtc_id = crtc->base.id; | |
1589 | } | |
3ed4351a | 1590 | |
7f07c35f | 1591 | spin_lock_irq(&dev->event_lock); |
3ed4351a DV |
1592 | |
1593 | /* | |
1594 | * drm_crtc_vblank_off() might have been called after we called | |
1595 | * drm_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |
1596 | * vblank disable, so no need for further locking. The reference from | |
1597 | * drm_vblank_get() protects against vblank disable from another source. | |
1598 | */ | |
1599 | if (!READ_ONCE(vblank->enabled)) { | |
1600 | ret = -EINVAL; | |
1601 | goto err_unlock; | |
1602 | } | |
1603 | ||
1604 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |
1605 | &e->event.base); | |
1606 | ||
1607 | if (ret) | |
1608 | goto err_unlock; | |
1609 | ||
1610 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1611 | ||
02149a76 SR |
1612 | drm_dbg_core(dev, "event on vblank count %llu, current %llu, crtc %u\n", |
1613 | req_seq, seq, pipe); | |
3ed4351a | 1614 | |
570e8696 | 1615 | trace_drm_vblank_event_queued(file_priv, pipe, req_seq); |
3ed4351a | 1616 | |
570e8696 | 1617 | e->sequence = req_seq; |
5e6c2b4f | 1618 | if (drm_vblank_passed(seq, req_seq)) { |
3ed4351a | 1619 | drm_vblank_put(dev, pipe); |
67680d3c | 1620 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1621 | vblwait->reply.sequence = seq; |
1622 | } else { | |
1623 | /* drm_handle_vblank_events will call drm_vblank_put */ | |
1624 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
570e8696 | 1625 | vblwait->reply.sequence = req_seq; |
3ed4351a DV |
1626 | } |
1627 | ||
7f07c35f | 1628 | spin_unlock_irq(&dev->event_lock); |
3ed4351a DV |
1629 | |
1630 | return 0; | |
1631 | ||
1632 | err_unlock: | |
7f07c35f | 1633 | spin_unlock_irq(&dev->event_lock); |
3ed4351a DV |
1634 | kfree(e); |
1635 | err_put: | |
1636 | drm_vblank_put(dev, pipe); | |
1637 | return ret; | |
1638 | } | |
1639 | ||
1640 | static bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait) | |
1641 | { | |
1642 | if (vblwait->request.sequence) | |
1643 | return false; | |
1644 | ||
1645 | return _DRM_VBLANK_RELATIVE == | |
1646 | (vblwait->request.type & (_DRM_VBLANK_TYPES_MASK | | |
1647 | _DRM_VBLANK_EVENT | | |
1648 | _DRM_VBLANK_NEXTONMISS)); | |
1649 | } | |
1650 | ||
570e8696 KP |
1651 | /* |
1652 | * Widen a 32-bit param to 64-bits. | |
1653 | * | |
1654 | * \param narrow 32-bit value (missing upper 32 bits) | |
1655 | * \param near 64-bit value that should be 'close' to near | |
1656 | * | |
1657 | * This function returns a 64-bit value using the lower 32-bits from | |
1658 | * 'narrow' and constructing the upper 32-bits so that the result is | |
1659 | * as close as possible to 'near'. | |
1660 | */ | |
1661 | ||
1662 | static u64 widen_32_to_64(u32 narrow, u64 near) | |
1663 | { | |
1664 | return near + (s32) (narrow - near); | |
1665 | } | |
1666 | ||
67680d3c AB |
1667 | static void drm_wait_vblank_reply(struct drm_device *dev, unsigned int pipe, |
1668 | struct drm_wait_vblank_reply *reply) | |
1669 | { | |
1670 | ktime_t now; | |
1671 | struct timespec64 ts; | |
1672 | ||
1673 | /* | |
1674 | * drm_wait_vblank_reply is a UAPI structure that uses 'long' | |
25e1a798 AB |
1675 | * to store the seconds. This is safe as we always use monotonic |
1676 | * timestamps since linux-4.15. | |
67680d3c AB |
1677 | */ |
1678 | reply->sequence = drm_vblank_count_and_time(dev, pipe, &now); | |
1679 | ts = ktime_to_timespec64(now); | |
1680 | reply->tval_sec = (u32)ts.tv_sec; | |
1681 | reply->tval_usec = ts.tv_nsec / 1000; | |
1682 | } | |
1683 | ||
1e4cd78e TZ |
1684 | static bool drm_wait_vblank_supported(struct drm_device *dev) |
1685 | { | |
1e4cd78e TZ |
1686 | return drm_dev_has_vblank(dev); |
1687 | } | |
1688 | ||
b6dcaaac DV |
1689 | int drm_wait_vblank_ioctl(struct drm_device *dev, void *data, |
1690 | struct drm_file *file_priv) | |
3ed4351a | 1691 | { |
7de440db | 1692 | struct drm_crtc *crtc; |
3ed4351a DV |
1693 | struct drm_vblank_crtc *vblank; |
1694 | union drm_wait_vblank *vblwait = data; | |
1695 | int ret; | |
570e8696 | 1696 | u64 req_seq, seq; |
7de440db | 1697 | unsigned int pipe_index; |
570e8696 | 1698 | unsigned int flags, pipe, high_pipe; |
3ed4351a | 1699 | |
1e4cd78e | 1700 | if (!drm_wait_vblank_supported(dev)) |
aed6105b | 1701 | return -EOPNOTSUPP; |
3ed4351a DV |
1702 | |
1703 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) | |
1704 | return -EINVAL; | |
1705 | ||
1706 | if (vblwait->request.type & | |
1707 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1708 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
02149a76 SR |
1709 | drm_dbg_core(dev, |
1710 | "Unsupported type value 0x%x, supported mask 0x%x\n", | |
1711 | vblwait->request.type, | |
1712 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1713 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
3ed4351a DV |
1714 | return -EINVAL; |
1715 | } | |
1716 | ||
1717 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; | |
1718 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); | |
1719 | if (high_pipe) | |
7de440db | 1720 | pipe_index = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; |
3ed4351a | 1721 | else |
7de440db KP |
1722 | pipe_index = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1723 | ||
1724 | /* Convert lease-relative crtc index into global crtc index */ | |
1725 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1726 | pipe = 0; | |
1727 | drm_for_each_crtc(crtc, dev) { | |
1728 | if (drm_lease_held(file_priv, crtc->base.id)) { | |
1729 | if (pipe_index == 0) | |
1730 | break; | |
1731 | pipe_index--; | |
1732 | } | |
1733 | pipe++; | |
1734 | } | |
1735 | } else { | |
1736 | pipe = pipe_index; | |
1737 | } | |
1738 | ||
3ed4351a DV |
1739 | if (pipe >= dev->num_crtcs) |
1740 | return -EINVAL; | |
1741 | ||
1742 | vblank = &dev->vblank[pipe]; | |
1743 | ||
1744 | /* If the counter is currently enabled and accurate, short-circuit | |
1745 | * queries to return the cached timestamp of the last vblank. | |
1746 | */ | |
1747 | if (dev->vblank_disable_immediate && | |
1748 | drm_wait_vblank_is_query(vblwait) && | |
1749 | READ_ONCE(vblank->enabled)) { | |
67680d3c | 1750 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
3ed4351a DV |
1751 | return 0; |
1752 | } | |
1753 | ||
1754 | ret = drm_vblank_get(dev, pipe); | |
1755 | if (ret) { | |
02149a76 SR |
1756 | drm_dbg_core(dev, |
1757 | "crtc %d failed to acquire vblank counter, %d\n", | |
1758 | pipe, ret); | |
3ed4351a DV |
1759 | return ret; |
1760 | } | |
1761 | seq = drm_vblank_count(dev, pipe); | |
1762 | ||
1763 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { | |
1764 | case _DRM_VBLANK_RELATIVE: | |
570e8696 KP |
1765 | req_seq = seq + vblwait->request.sequence; |
1766 | vblwait->request.sequence = req_seq; | |
3ed4351a | 1767 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; |
570e8696 | 1768 | break; |
3ed4351a | 1769 | case _DRM_VBLANK_ABSOLUTE: |
570e8696 | 1770 | req_seq = widen_32_to_64(vblwait->request.sequence, seq); |
3ed4351a DV |
1771 | break; |
1772 | default: | |
1773 | ret = -EINVAL; | |
1774 | goto done; | |
1775 | } | |
1776 | ||
1777 | if ((flags & _DRM_VBLANK_NEXTONMISS) && | |
5e6c2b4f | 1778 | drm_vblank_passed(seq, req_seq)) { |
570e8696 KP |
1779 | req_seq = seq + 1; |
1780 | vblwait->request.type &= ~_DRM_VBLANK_NEXTONMISS; | |
1781 | vblwait->request.sequence = req_seq; | |
1782 | } | |
3ed4351a DV |
1783 | |
1784 | if (flags & _DRM_VBLANK_EVENT) { | |
1785 | /* must hold on to the vblank ref until the event fires | |
1786 | * drm_vblank_put will be called asynchronously | |
1787 | */ | |
570e8696 | 1788 | return drm_queue_vblank_event(dev, pipe, req_seq, vblwait, file_priv); |
3ed4351a DV |
1789 | } |
1790 | ||
570e8696 | 1791 | if (req_seq != seq) { |
05103ea9 SR |
1792 | int wait; |
1793 | ||
02149a76 SR |
1794 | drm_dbg_core(dev, "waiting on vblank count %llu, crtc %u\n", |
1795 | req_seq, pipe); | |
05103ea9 | 1796 | wait = wait_event_interruptible_timeout(vblank->queue, |
5e6c2b4f | 1797 | drm_vblank_passed(drm_vblank_count(dev, pipe), req_seq) || |
05103ea9 SR |
1798 | !READ_ONCE(vblank->enabled), |
1799 | msecs_to_jiffies(3000)); | |
1800 | ||
1801 | switch (wait) { | |
1802 | case 0: | |
1803 | /* timeout */ | |
1804 | ret = -EBUSY; | |
1805 | break; | |
1806 | case -ERESTARTSYS: | |
1807 | /* interrupted by signal */ | |
1808 | ret = -EINTR; | |
1809 | break; | |
1810 | default: | |
1811 | ret = 0; | |
1812 | break; | |
1813 | } | |
3ed4351a DV |
1814 | } |
1815 | ||
1816 | if (ret != -EINTR) { | |
67680d3c | 1817 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
3ed4351a | 1818 | |
02149a76 SR |
1819 | drm_dbg_core(dev, "crtc %d returning %u to client\n", |
1820 | pipe, vblwait->reply.sequence); | |
3ed4351a | 1821 | } else { |
02149a76 SR |
1822 | drm_dbg_core(dev, "crtc %d vblank wait interrupted by signal\n", |
1823 | pipe); | |
3ed4351a DV |
1824 | } |
1825 | ||
1826 | done: | |
1827 | drm_vblank_put(dev, pipe); | |
1828 | return ret; | |
1829 | } | |
1830 | ||
1831 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) | |
1832 | { | |
7fe3f0d1 TZ |
1833 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
1834 | bool high_prec = false; | |
3ed4351a | 1835 | struct drm_pending_vblank_event *e, *t; |
67680d3c | 1836 | ktime_t now; |
570e8696 | 1837 | u64 seq; |
3ed4351a DV |
1838 | |
1839 | assert_spin_locked(&dev->event_lock); | |
1840 | ||
1841 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1842 | ||
1843 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1844 | if (e->pipe != pipe) | |
1845 | continue; | |
5e6c2b4f | 1846 | if (!drm_vblank_passed(seq, e->sequence)) |
3ed4351a DV |
1847 | continue; |
1848 | ||
02149a76 SR |
1849 | drm_dbg_core(dev, "vblank event on %llu, current %llu\n", |
1850 | e->sequence, seq); | |
3ed4351a DV |
1851 | |
1852 | list_del(&e->base.link); | |
1853 | drm_vblank_put(dev, pipe); | |
67680d3c | 1854 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1855 | } |
1856 | ||
7fe3f0d1 TZ |
1857 | if (crtc && crtc->funcs->get_vblank_timestamp) |
1858 | high_prec = true; | |
7fe3f0d1 TZ |
1859 | |
1860 | trace_drm_vblank_event(pipe, seq, now, high_prec); | |
3ed4351a DV |
1861 | } |
1862 | ||
1863 | /** | |
1864 | * drm_handle_vblank - handle a vblank event | |
1865 | * @dev: DRM device | |
1866 | * @pipe: index of CRTC where this event occurred | |
1867 | * | |
1868 | * Drivers should call this routine in their vblank interrupt handlers to | |
1869 | * update the vblank counter and send any signals that may be pending. | |
1870 | * | |
1871 | * This is the legacy version of drm_crtc_handle_vblank(). | |
1872 | */ | |
1873 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) | |
1874 | { | |
1875 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1876 | unsigned long irqflags; | |
1877 | bool disable_irq; | |
1878 | ||
5a4784f4 | 1879 | if (drm_WARN_ON_ONCE(dev, !drm_dev_has_vblank(dev))) |
3ed4351a DV |
1880 | return false; |
1881 | ||
5a4784f4 | 1882 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1883 | return false; |
1884 | ||
1885 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1886 | ||
1887 | /* Need timestamp lock to prevent concurrent execution with | |
1888 | * vblank enable/disable, as this would cause inconsistent | |
1889 | * or corrupted timestamps and vblank counts. | |
1890 | */ | |
1891 | spin_lock(&dev->vblank_time_lock); | |
1892 | ||
1893 | /* Vblank irq handling disabled. Nothing to do. */ | |
1894 | if (!vblank->enabled) { | |
1895 | spin_unlock(&dev->vblank_time_lock); | |
1896 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1897 | return false; | |
1898 | } | |
1899 | ||
1900 | drm_update_vblank_count(dev, pipe, true); | |
1901 | ||
1902 | spin_unlock(&dev->vblank_time_lock); | |
1903 | ||
1904 | wake_up(&vblank->queue); | |
1905 | ||
1906 | /* With instant-off, we defer disabling the interrupt until after | |
1907 | * we finish processing the following vblank after all events have | |
1908 | * been signaled. The disable has to be last (after | |
1909 | * drm_handle_vblank_events) so that the timestamp is always accurate. | |
1910 | */ | |
1911 | disable_irq = (dev->vblank_disable_immediate && | |
1912 | drm_vblank_offdelay > 0 && | |
1913 | !atomic_read(&vblank->refcount)); | |
1914 | ||
1915 | drm_handle_vblank_events(dev, pipe); | |
5e6c2b4f | 1916 | drm_handle_vblank_works(vblank); |
3ed4351a DV |
1917 | |
1918 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1919 | ||
1920 | if (disable_irq) | |
e99e88a9 | 1921 | vblank_disable_fn(&vblank->disable_timer); |
3ed4351a DV |
1922 | |
1923 | return true; | |
1924 | } | |
1925 | EXPORT_SYMBOL(drm_handle_vblank); | |
1926 | ||
1927 | /** | |
1928 | * drm_crtc_handle_vblank - handle a vblank event | |
1929 | * @crtc: where this event occurred | |
1930 | * | |
1931 | * Drivers should call this routine in their vblank interrupt handlers to | |
1932 | * update the vblank counter and send any signals that may be pending. | |
1933 | * | |
1934 | * This is the native KMS version of drm_handle_vblank(). | |
1935 | * | |
bd7e3f3b DV |
1936 | * Note that for a given vblank counter value drm_crtc_handle_vblank() |
1937 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() | |
1938 | * provide a barrier: Any writes done before calling | |
1939 | * drm_crtc_handle_vblank() will be visible to callers of the later | |
0ae865ef | 1940 | * functions, if the vblank count is the same or a later one. |
bd7e3f3b DV |
1941 | * |
1942 | * See also &drm_vblank_crtc.count. | |
1943 | * | |
3ed4351a DV |
1944 | * Returns: |
1945 | * True if the event was successfully handled, false on failure. | |
1946 | */ | |
1947 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1948 | { | |
1949 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1950 | } | |
1951 | EXPORT_SYMBOL(drm_crtc_handle_vblank); | |
3064abfa KP |
1952 | |
1953 | /* | |
1954 | * Get crtc VBLANK count. | |
1955 | * | |
1956 | * \param dev DRM device | |
0ae865ef | 1957 | * \param data user argument, pointing to a drm_crtc_get_sequence structure. |
3064abfa KP |
1958 | * \param file_priv drm file private for the user's open file descriptor |
1959 | */ | |
1960 | ||
1961 | int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data, | |
1962 | struct drm_file *file_priv) | |
1963 | { | |
1964 | struct drm_crtc *crtc; | |
1965 | struct drm_vblank_crtc *vblank; | |
1966 | int pipe; | |
1967 | struct drm_crtc_get_sequence *get_seq = data; | |
1968 | ktime_t now; | |
1969 | bool vblank_enabled; | |
1970 | int ret; | |
1971 | ||
1972 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
69fdf420 | 1973 | return -EOPNOTSUPP; |
3064abfa | 1974 | |
1e4cd78e | 1975 | if (!drm_dev_has_vblank(dev)) |
aed6105b | 1976 | return -EOPNOTSUPP; |
3064abfa KP |
1977 | |
1978 | crtc = drm_crtc_find(dev, file_priv, get_seq->crtc_id); | |
1979 | if (!crtc) | |
1980 | return -ENOENT; | |
1981 | ||
1982 | pipe = drm_crtc_index(crtc); | |
1983 | ||
1984 | vblank = &dev->vblank[pipe]; | |
1985 | vblank_enabled = dev->vblank_disable_immediate && READ_ONCE(vblank->enabled); | |
1986 | ||
1987 | if (!vblank_enabled) { | |
1988 | ret = drm_crtc_vblank_get(crtc); | |
1989 | if (ret) { | |
02149a76 SR |
1990 | drm_dbg_core(dev, |
1991 | "crtc %d failed to acquire vblank counter, %d\n", | |
1992 | pipe, ret); | |
3064abfa KP |
1993 | return ret; |
1994 | } | |
1995 | } | |
1996 | drm_modeset_lock(&crtc->mutex, NULL); | |
1997 | if (crtc->state) | |
1998 | get_seq->active = crtc->state->enable; | |
1999 | else | |
2000 | get_seq->active = crtc->enabled; | |
2001 | drm_modeset_unlock(&crtc->mutex); | |
2002 | get_seq->sequence = drm_vblank_count_and_time(dev, pipe, &now); | |
2003 | get_seq->sequence_ns = ktime_to_ns(now); | |
2004 | if (!vblank_enabled) | |
2005 | drm_crtc_vblank_put(crtc); | |
2006 | return 0; | |
2007 | } | |
2008 | ||
2009 | /* | |
2010 | * Queue a event for VBLANK sequence | |
2011 | * | |
2012 | * \param dev DRM device | |
0ae865ef | 2013 | * \param data user argument, pointing to a drm_crtc_queue_sequence structure. |
3064abfa KP |
2014 | * \param file_priv drm file private for the user's open file descriptor |
2015 | */ | |
2016 | ||
2017 | int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data, | |
2018 | struct drm_file *file_priv) | |
2019 | { | |
2020 | struct drm_crtc *crtc; | |
2021 | struct drm_vblank_crtc *vblank; | |
2022 | int pipe; | |
2023 | struct drm_crtc_queue_sequence *queue_seq = data; | |
2024 | ktime_t now; | |
2025 | struct drm_pending_vblank_event *e; | |
2026 | u32 flags; | |
2027 | u64 seq; | |
2028 | u64 req_seq; | |
2029 | int ret; | |
3064abfa KP |
2030 | |
2031 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
69fdf420 | 2032 | return -EOPNOTSUPP; |
3064abfa | 2033 | |
1e4cd78e | 2034 | if (!drm_dev_has_vblank(dev)) |
aed6105b | 2035 | return -EOPNOTSUPP; |
3064abfa KP |
2036 | |
2037 | crtc = drm_crtc_find(dev, file_priv, queue_seq->crtc_id); | |
2038 | if (!crtc) | |
2039 | return -ENOENT; | |
2040 | ||
2041 | flags = queue_seq->flags; | |
2042 | /* Check valid flag bits */ | |
2043 | if (flags & ~(DRM_CRTC_SEQUENCE_RELATIVE| | |
2044 | DRM_CRTC_SEQUENCE_NEXT_ON_MISS)) | |
2045 | return -EINVAL; | |
2046 | ||
2047 | pipe = drm_crtc_index(crtc); | |
2048 | ||
2049 | vblank = &dev->vblank[pipe]; | |
2050 | ||
2051 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
2052 | if (e == NULL) | |
2053 | return -ENOMEM; | |
2054 | ||
2055 | ret = drm_crtc_vblank_get(crtc); | |
2056 | if (ret) { | |
02149a76 SR |
2057 | drm_dbg_core(dev, |
2058 | "crtc %d failed to acquire vblank counter, %d\n", | |
2059 | pipe, ret); | |
3064abfa KP |
2060 | goto err_free; |
2061 | } | |
2062 | ||
2063 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
2064 | req_seq = queue_seq->sequence; | |
2065 | ||
2066 | if (flags & DRM_CRTC_SEQUENCE_RELATIVE) | |
2067 | req_seq += seq; | |
2068 | ||
5e6c2b4f | 2069 | if ((flags & DRM_CRTC_SEQUENCE_NEXT_ON_MISS) && drm_vblank_passed(seq, req_seq)) |
3064abfa KP |
2070 | req_seq = seq + 1; |
2071 | ||
2072 | e->pipe = pipe; | |
2073 | e->event.base.type = DRM_EVENT_CRTC_SEQUENCE; | |
2074 | e->event.base.length = sizeof(e->event.seq); | |
2075 | e->event.seq.user_data = queue_seq->user_data; | |
2076 | ||
5887a2ad | 2077 | spin_lock_irq(&dev->event_lock); |
3064abfa KP |
2078 | |
2079 | /* | |
2080 | * drm_crtc_vblank_off() might have been called after we called | |
2081 | * drm_crtc_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |
2082 | * vblank disable, so no need for further locking. The reference from | |
2083 | * drm_crtc_vblank_get() protects against vblank disable from another source. | |
2084 | */ | |
2085 | if (!READ_ONCE(vblank->enabled)) { | |
2086 | ret = -EINVAL; | |
2087 | goto err_unlock; | |
2088 | } | |
2089 | ||
2090 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |
2091 | &e->event.base); | |
2092 | ||
2093 | if (ret) | |
2094 | goto err_unlock; | |
2095 | ||
2096 | e->sequence = req_seq; | |
2097 | ||
5e6c2b4f | 2098 | if (drm_vblank_passed(seq, req_seq)) { |
3064abfa KP |
2099 | drm_crtc_vblank_put(crtc); |
2100 | send_vblank_event(dev, e, seq, now); | |
2101 | queue_seq->sequence = seq; | |
2102 | } else { | |
2103 | /* drm_handle_vblank_events will call drm_vblank_put */ | |
2104 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
2105 | queue_seq->sequence = req_seq; | |
2106 | } | |
2107 | ||
5887a2ad | 2108 | spin_unlock_irq(&dev->event_lock); |
3064abfa KP |
2109 | return 0; |
2110 | ||
2111 | err_unlock: | |
5887a2ad | 2112 | spin_unlock_irq(&dev->event_lock); |
3064abfa KP |
2113 | drm_crtc_vblank_put(crtc); |
2114 | err_free: | |
2115 | kfree(e); | |
2116 | return ret; | |
2117 | } | |
5e6c2b4f | 2118 |