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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 | ||
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 DV |
212 | } |
213 | #ifdef CONFIG_DRM_LEGACY | |
214 | else if (dev->driver->get_vblank_counter) { | |
3ed4351a | 215 | return dev->driver->get_vblank_counter(dev, pipe); |
f397d66b | 216 | } |
57bb1ee6 | 217 | #endif |
3ed4351a DV |
218 | |
219 | return drm_vblank_no_hw_counter(dev, pipe); | |
220 | } | |
221 | ||
222 | /* | |
223 | * Reset the stored timestamp for the current vblank count to correspond | |
224 | * to the last vblank occurred. | |
225 | * | |
226 | * Only to be called from drm_crtc_vblank_on(). | |
227 | * | |
228 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes | |
229 | * device vblank fields. | |
230 | */ | |
231 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) | |
232 | { | |
233 | u32 cur_vblank; | |
234 | bool rc; | |
67680d3c | 235 | ktime_t t_vblank; |
3ed4351a DV |
236 | int count = DRM_TIMESTAMP_MAXRETRIES; |
237 | ||
238 | spin_lock(&dev->vblank_time_lock); | |
239 | ||
240 | /* | |
241 | * sample the current counter to avoid random jumps | |
242 | * when drm_vblank_enable() applies the diff | |
243 | */ | |
244 | do { | |
245 | cur_vblank = __get_vblank_counter(dev, pipe); | |
246 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false); | |
247 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
248 | ||
249 | /* | |
250 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
251 | * available and didn't fail. Otherwise reinitialize delayed at next vblank | |
252 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
253 | */ | |
254 | if (!rc) | |
67680d3c | 255 | t_vblank = 0; |
3ed4351a DV |
256 | |
257 | /* | |
258 | * +1 to make sure user will never see the same | |
259 | * vblank counter value before and after a modeset | |
260 | */ | |
67680d3c | 261 | store_vblank(dev, pipe, 1, t_vblank, cur_vblank); |
3ed4351a DV |
262 | |
263 | spin_unlock(&dev->vblank_time_lock); | |
264 | } | |
265 | ||
266 | /* | |
267 | * Call back into the driver to update the appropriate vblank counter | |
268 | * (specified by @pipe). Deal with wraparound, if it occurred, and | |
269 | * update the last read value so we can deal with wraparound on the next | |
270 | * call if necessary. | |
271 | * | |
272 | * Only necessary when going from off->on, to account for frames we | |
273 | * didn't get an interrupt for. | |
274 | * | |
275 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes | |
276 | * device vblank fields. | |
277 | */ | |
278 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, | |
279 | bool in_vblank_irq) | |
280 | { | |
281 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
282 | u32 cur_vblank, diff; | |
283 | bool rc; | |
67680d3c | 284 | ktime_t t_vblank; |
3ed4351a DV |
285 | int count = DRM_TIMESTAMP_MAXRETRIES; |
286 | int framedur_ns = vblank->framedur_ns; | |
ed20151a | 287 | u32 max_vblank_count = drm_max_vblank_count(dev, pipe); |
3ed4351a DV |
288 | |
289 | /* | |
290 | * Interrupts were disabled prior to this call, so deal with counter | |
291 | * wrap if needed. | |
292 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events | |
293 | * here if the register is small or we had vblank interrupts off for | |
294 | * a long time. | |
295 | * | |
296 | * We repeat the hardware vblank counter & timestamp query until | |
297 | * we get consistent results. This to prevent races between gpu | |
298 | * updating its hardware counter while we are retrieving the | |
299 | * corresponding vblank timestamp. | |
300 | */ | |
301 | do { | |
302 | cur_vblank = __get_vblank_counter(dev, pipe); | |
303 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq); | |
304 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
305 | ||
ed20151a | 306 | if (max_vblank_count) { |
3ed4351a | 307 | /* trust the hw counter when it's around */ |
ed20151a | 308 | diff = (cur_vblank - vblank->last) & max_vblank_count; |
3ed4351a | 309 | } else if (rc && framedur_ns) { |
67680d3c | 310 | u64 diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); |
3ed4351a DV |
311 | |
312 | /* | |
313 | * Figure out how many vblanks we've missed based | |
314 | * on the difference in the timestamps and the | |
315 | * frame/field duration. | |
316 | */ | |
41ff5bd8 | 317 | |
02149a76 SR |
318 | drm_dbg_vbl(dev, "crtc %u: Calculating number of vblanks." |
319 | " diff_ns = %lld, framedur_ns = %d)\n", | |
320 | pipe, (long long)diff_ns, framedur_ns); | |
41ff5bd8 | 321 | |
3ed4351a DV |
322 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); |
323 | ||
324 | if (diff == 0 && in_vblank_irq) | |
02149a76 SR |
325 | drm_dbg_vbl(dev, "crtc %u: Redundant vblirq ignored\n", |
326 | pipe); | |
3ed4351a DV |
327 | } else { |
328 | /* some kind of default for drivers w/o accurate vbl timestamping */ | |
329 | diff = in_vblank_irq ? 1 : 0; | |
330 | } | |
331 | ||
332 | /* | |
333 | * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset | |
334 | * interval? If so then vblank irqs keep running and it will likely | |
335 | * happen that the hardware vblank counter is not trustworthy as it | |
336 | * might reset at some point in that interval and vblank timestamps | |
337 | * are not trustworthy either in that interval. Iow. this can result | |
338 | * in a bogus diff >> 1 which must be avoided as it would cause | |
339 | * random large forward jumps of the software vblank counter. | |
340 | */ | |
341 | if (diff > 1 && (vblank->inmodeset & 0x2)) { | |
02149a76 SR |
342 | drm_dbg_vbl(dev, |
343 | "clamping vblank bump to 1 on crtc %u: diffr=%u" | |
344 | " due to pre-modeset.\n", pipe, diff); | |
3ed4351a DV |
345 | diff = 1; |
346 | } | |
347 | ||
02149a76 SR |
348 | drm_dbg_vbl(dev, "updating vblank count on crtc %u:" |
349 | " current=%llu, diff=%u, hw=%u hw_last=%u\n", | |
350 | pipe, (unsigned long long)atomic64_read(&vblank->count), | |
351 | diff, cur_vblank, vblank->last); | |
3ed4351a DV |
352 | |
353 | if (diff == 0) { | |
5a4784f4 | 354 | drm_WARN_ON_ONCE(dev, cur_vblank != vblank->last); |
3ed4351a DV |
355 | return; |
356 | } | |
357 | ||
358 | /* | |
359 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
360 | * available and didn't fail, or we were called from the vblank interrupt. | |
361 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 | |
362 | * for now, to mark the vblanktimestamp as invalid. | |
363 | */ | |
138b87fa | 364 | if (!rc && !in_vblank_irq) |
67680d3c | 365 | t_vblank = 0; |
3ed4351a | 366 | |
67680d3c | 367 | store_vblank(dev, pipe, diff, t_vblank, cur_vblank); |
3ed4351a DV |
368 | } |
369 | ||
5e6c2b4f | 370 | u64 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
3ed4351a DV |
371 | { |
372 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
bd7e3f3b | 373 | u64 count; |
3ed4351a | 374 | |
5a4784f4 | 375 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
376 | return 0; |
377 | ||
bd7e3f3b DV |
378 | count = atomic64_read(&vblank->count); |
379 | ||
380 | /* | |
381 | * This read barrier corresponds to the implicit write barrier of the | |
382 | * write seqlock in store_vblank(). Note that this is the only place | |
383 | * where we need an explicit barrier, since all other access goes | |
384 | * through drm_vblank_count_and_time(), which already has the required | |
385 | * read barrier curtesy of the read seqlock. | |
386 | */ | |
387 | smp_rmb(); | |
388 | ||
389 | return count; | |
3ed4351a DV |
390 | } |
391 | ||
392 | /** | |
ca814b25 | 393 | * drm_crtc_accurate_vblank_count - retrieve the master vblank counter |
3ed4351a DV |
394 | * @crtc: which counter to retrieve |
395 | * | |
57d30230 DV |
396 | * This function is similar to drm_crtc_vblank_count() but this function |
397 | * interpolates to handle a race with vblank interrupts using the high precision | |
398 | * timestamping support. | |
3ed4351a | 399 | * |
57d30230 DV |
400 | * This is mostly useful for hardware that can obtain the scanout position, but |
401 | * doesn't have a hardware frame counter. | |
3ed4351a | 402 | */ |
3b765c0b | 403 | u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc) |
3ed4351a DV |
404 | { |
405 | struct drm_device *dev = crtc->dev; | |
406 | unsigned int pipe = drm_crtc_index(crtc); | |
3b765c0b | 407 | u64 vblank; |
3ed4351a DV |
408 | unsigned long flags; |
409 | ||
5a4784f4 SR |
410 | drm_WARN_ONCE(dev, drm_debug_enabled(DRM_UT_VBL) && |
411 | !crtc->funcs->get_vblank_timestamp, | |
412 | "This function requires support for accurate vblank timestamps."); | |
3ed4351a DV |
413 | |
414 | spin_lock_irqsave(&dev->vblank_time_lock, flags); | |
415 | ||
416 | drm_update_vblank_count(dev, pipe, false); | |
417 | vblank = drm_vblank_count(dev, pipe); | |
418 | ||
419 | spin_unlock_irqrestore(&dev->vblank_time_lock, flags); | |
420 | ||
421 | return vblank; | |
422 | } | |
ca814b25 | 423 | EXPORT_SYMBOL(drm_crtc_accurate_vblank_count); |
3ed4351a DV |
424 | |
425 | static void __disable_vblank(struct drm_device *dev, unsigned int pipe) | |
426 | { | |
427 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
428 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
429 | ||
5a4784f4 | 430 | if (drm_WARN_ON(dev, !crtc)) |
4ffb8dee JM |
431 | return; |
432 | ||
f397d66b | 433 | if (crtc->funcs->disable_vblank) |
3ed4351a | 434 | crtc->funcs->disable_vblank(crtc); |
57bb1ee6 DV |
435 | } |
436 | #ifdef CONFIG_DRM_LEGACY | |
437 | else { | |
f397d66b | 438 | dev->driver->disable_vblank(dev, pipe); |
3ed4351a | 439 | } |
57bb1ee6 | 440 | #endif |
3ed4351a DV |
441 | } |
442 | ||
443 | /* | |
444 | * Disable vblank irq's on crtc, make sure that last vblank count | |
445 | * of hardware and corresponding consistent software vblank counter | |
446 | * are preserved, even if there are any spurious vblank irq's after | |
447 | * disable. | |
448 | */ | |
449 | void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) | |
450 | { | |
451 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
452 | unsigned long irqflags; | |
453 | ||
454 | assert_spin_locked(&dev->vbl_lock); | |
455 | ||
456 | /* Prevent vblank irq processing while disabling vblank irqs, | |
457 | * so no updates of timestamps or count can happen after we've | |
458 | * disabled. Needed to prevent races in case of delayed irq's. | |
459 | */ | |
460 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
461 | ||
462 | /* | |
68036b08 DP |
463 | * Update vblank count and disable vblank interrupts only if the |
464 | * interrupts were enabled. This avoids calling the ->disable_vblank() | |
465 | * operation in atomic context with the hardware potentially runtime | |
466 | * suspended. | |
3ed4351a | 467 | */ |
68036b08 DP |
468 | if (!vblank->enabled) |
469 | goto out; | |
3ed4351a DV |
470 | |
471 | /* | |
68036b08 | 472 | * Update the count and timestamp to maintain the |
3ed4351a DV |
473 | * appearance that the counter has been ticking all along until |
474 | * this time. This makes the count account for the entire time | |
475 | * between drm_crtc_vblank_on() and drm_crtc_vblank_off(). | |
476 | */ | |
477 | drm_update_vblank_count(dev, pipe, false); | |
68036b08 DP |
478 | __disable_vblank(dev, pipe); |
479 | vblank->enabled = false; | |
3ed4351a | 480 | |
68036b08 | 481 | out: |
3ed4351a DV |
482 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
483 | } | |
484 | ||
e99e88a9 | 485 | static void vblank_disable_fn(struct timer_list *t) |
3ed4351a | 486 | { |
e99e88a9 | 487 | struct drm_vblank_crtc *vblank = from_timer(vblank, t, disable_timer); |
3ed4351a DV |
488 | struct drm_device *dev = vblank->dev; |
489 | unsigned int pipe = vblank->pipe; | |
490 | unsigned long irqflags; | |
491 | ||
492 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
493 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
02149a76 | 494 | drm_dbg_core(dev, "disabling vblank on crtc %u\n", pipe); |
3ed4351a DV |
495 | drm_vblank_disable_and_save(dev, pipe); |
496 | } | |
497 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
498 | } | |
499 | ||
c23d686f | 500 | static void drm_vblank_init_release(struct drm_device *dev, void *ptr) |
3ed4351a | 501 | { |
a7e5e06d | 502 | struct drm_vblank_crtc *vblank = ptr; |
3ed4351a | 503 | |
a7e5e06d LP |
504 | drm_WARN_ON(dev, READ_ONCE(vblank->enabled) && |
505 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
3ed4351a | 506 | |
5e6c2b4f | 507 | drm_vblank_destroy_worker(vblank); |
a7e5e06d | 508 | del_timer_sync(&vblank->disable_timer); |
3ed4351a | 509 | } |
3ed4351a DV |
510 | |
511 | /** | |
512 | * drm_vblank_init - initialize vblank support | |
513 | * @dev: DRM device | |
514 | * @num_crtcs: number of CRTCs supported by @dev | |
515 | * | |
516 | * This function initializes vblank support for @num_crtcs display pipelines. | |
c23d686f | 517 | * Cleanup is handled automatically through a cleanup function added with |
a7e5e06d | 518 | * drmm_add_action_or_reset(). |
3ed4351a DV |
519 | * |
520 | * Returns: | |
521 | * Zero on success or a negative error code on failure. | |
522 | */ | |
523 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) | |
524 | { | |
c23d686f | 525 | int ret; |
3ed4351a DV |
526 | unsigned int i; |
527 | ||
528 | spin_lock_init(&dev->vbl_lock); | |
529 | spin_lock_init(&dev->vblank_time_lock); | |
530 | ||
c23d686f DV |
531 | dev->vblank = drmm_kcalloc(dev, num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
532 | if (!dev->vblank) | |
533 | return -ENOMEM; | |
534 | ||
3ed4351a DV |
535 | dev->num_crtcs = num_crtcs; |
536 | ||
3ed4351a DV |
537 | for (i = 0; i < num_crtcs; i++) { |
538 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; | |
539 | ||
540 | vblank->dev = dev; | |
541 | vblank->pipe = i; | |
542 | init_waitqueue_head(&vblank->queue); | |
e99e88a9 | 543 | timer_setup(&vblank->disable_timer, vblank_disable_fn, 0); |
3ed4351a | 544 | seqlock_init(&vblank->seqlock); |
a7e5e06d LP |
545 | |
546 | ret = drmm_add_action_or_reset(dev, drm_vblank_init_release, | |
547 | vblank); | |
548 | if (ret) | |
549 | return ret; | |
5e6c2b4f LP |
550 | |
551 | ret = drm_vblank_worker_init(vblank); | |
552 | if (ret) | |
553 | return ret; | |
3ed4351a DV |
554 | } |
555 | ||
3ed4351a | 556 | return 0; |
3ed4351a DV |
557 | } |
558 | EXPORT_SYMBOL(drm_vblank_init); | |
559 | ||
7beb691f TZ |
560 | /** |
561 | * drm_dev_has_vblank - test if vblanking has been initialized for | |
562 | * a device | |
563 | * @dev: the device | |
564 | * | |
565 | * Drivers may call this function to test if vblank support is | |
566 | * initialized for a device. For most hardware this means that vblanking | |
567 | * can also be enabled. | |
568 | * | |
569 | * Atomic helpers use this function to initialize | |
570 | * &drm_crtc_state.no_vblank. See also drm_atomic_helper_check_modeset(). | |
571 | * | |
572 | * Returns: | |
573 | * True if vblanking has been initialized for the given device, false | |
574 | * otherwise. | |
575 | */ | |
576 | bool drm_dev_has_vblank(const struct drm_device *dev) | |
577 | { | |
578 | return dev->num_crtcs != 0; | |
579 | } | |
580 | EXPORT_SYMBOL(drm_dev_has_vblank); | |
581 | ||
3ed4351a DV |
582 | /** |
583 | * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC | |
584 | * @crtc: which CRTC's vblank waitqueue to retrieve | |
585 | * | |
586 | * This function returns a pointer to the vblank waitqueue for the CRTC. | |
587 | * Drivers can use this to implement vblank waits using wait_event() and related | |
588 | * functions. | |
589 | */ | |
590 | wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc) | |
591 | { | |
592 | return &crtc->dev->vblank[drm_crtc_index(crtc)].queue; | |
593 | } | |
594 | EXPORT_SYMBOL(drm_crtc_vblank_waitqueue); | |
595 | ||
596 | ||
597 | /** | |
598 | * drm_calc_timestamping_constants - calculate vblank timestamp constants | |
599 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
600 | * @mode: display mode containing the scanout timings | |
601 | * | |
57d30230 DV |
602 | * Calculate and store various constants which are later needed by vblank and |
603 | * swap-completion timestamping, e.g, by | |
7fe3f0d1 TZ |
604 | * drm_crtc_vblank_helper_get_vblank_timestamp(). They are derived from |
605 | * CRTC's true scanout timing, so they take things like panel scaling or | |
606 | * other adjustments into account. | |
3ed4351a DV |
607 | */ |
608 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, | |
609 | const struct drm_display_mode *mode) | |
610 | { | |
611 | struct drm_device *dev = crtc->dev; | |
612 | unsigned int pipe = drm_crtc_index(crtc); | |
613 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
614 | int linedur_ns = 0, framedur_ns = 0; | |
615 | int dotclock = mode->crtc_clock; | |
616 | ||
6015002e | 617 | if (!drm_dev_has_vblank(dev)) |
3ed4351a DV |
618 | return; |
619 | ||
5a4784f4 | 620 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
621 | return; |
622 | ||
623 | /* Valid dotclock? */ | |
624 | if (dotclock > 0) { | |
625 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; | |
626 | ||
627 | /* | |
628 | * Convert scanline length in pixels and video | |
629 | * dot clock to line duration and frame duration | |
630 | * in nanoseconds: | |
631 | */ | |
632 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
633 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
634 | ||
635 | /* | |
636 | * Fields of interlaced scanout modes are only half a frame duration. | |
637 | */ | |
638 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
639 | framedur_ns /= 2; | |
02149a76 SR |
640 | } else { |
641 | drm_err(dev, "crtc %u: Can't calculate constants, dotclock = 0!\n", | |
642 | crtc->base.id); | |
643 | } | |
3ed4351a DV |
644 | |
645 | vblank->linedur_ns = linedur_ns; | |
646 | vblank->framedur_ns = framedur_ns; | |
a3342f4d | 647 | drm_mode_copy(&vblank->hwmode, mode); |
3ed4351a | 648 | |
02149a76 SR |
649 | drm_dbg_core(dev, |
650 | "crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
651 | crtc->base.id, mode->crtc_htotal, | |
652 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
653 | drm_dbg_core(dev, "crtc %u: clock %d kHz framedur %d linedur %d\n", | |
654 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
3ed4351a DV |
655 | } |
656 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
657 | ||
f1e2b637 TZ |
658 | /** |
659 | * drm_crtc_vblank_helper_get_vblank_timestamp_internal - precise vblank | |
660 | * timestamp helper | |
099d705d | 661 | * @crtc: CRTC whose vblank timestamp to retrieve |
f1e2b637 TZ |
662 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
663 | * On return contains true maximum error of timestamp | |
664 | * @vblank_time: Pointer to time which should receive the timestamp | |
665 | * @in_vblank_irq: | |
666 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
667 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
668 | * if flag is set. | |
669 | * @get_scanout_position: | |
670 | * Callback function to retrieve the scanout position. See | |
671 | * @struct drm_crtc_helper_funcs.get_scanout_position. | |
f1e2b637 TZ |
672 | * |
673 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
674 | * timings and current video scanout position of a CRTC. | |
675 | * | |
676 | * The current implementation only handles standard video modes. For double scan | |
677 | * and interlaced modes the driver is supposed to adjust the hardware mode | |
678 | * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to | |
679 | * match the scanout position reported. | |
680 | * | |
681 | * Note that atomic drivers must call drm_calc_timestamping_constants() before | |
682 | * enabling a CRTC. The atomic helpers already take care of that in | |
441959eb | 683 | * drm_atomic_helper_calc_timestamping_constants(). |
f1e2b637 TZ |
684 | * |
685 | * Returns: | |
686 | * | |
687 | * Returns true on success, and false on failure, i.e. when no accurate | |
688 | * timestamp could be acquired. | |
689 | */ | |
690 | bool | |
691 | drm_crtc_vblank_helper_get_vblank_timestamp_internal( | |
692 | struct drm_crtc *crtc, int *max_error, ktime_t *vblank_time, | |
693 | bool in_vblank_irq, | |
48e67807 | 694 | drm_vblank_get_scanout_position_func get_scanout_position) |
f1e2b637 TZ |
695 | { |
696 | struct drm_device *dev = crtc->dev; | |
697 | unsigned int pipe = crtc->index; | |
698 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
699 | struct timespec64 ts_etime, ts_vblank_time; | |
700 | ktime_t stime, etime; | |
701 | bool vbl_status; | |
702 | const struct drm_display_mode *mode; | |
703 | int vpos, hpos, i; | |
704 | int delta_ns, duration_ns; | |
705 | ||
706 | if (pipe >= dev->num_crtcs) { | |
02149a76 | 707 | drm_err(dev, "Invalid crtc %u\n", pipe); |
3ed4351a DV |
708 | return false; |
709 | } | |
710 | ||
711 | /* Scanout position query not supported? Should not happen. */ | |
48e67807 | 712 | if (!get_scanout_position) { |
02149a76 | 713 | drm_err(dev, "Called from CRTC w/o get_scanout_position()!?\n"); |
3ed4351a DV |
714 | return false; |
715 | } | |
716 | ||
717 | if (drm_drv_uses_atomic_modeset(dev)) | |
718 | mode = &vblank->hwmode; | |
719 | else | |
720 | mode = &crtc->hwmode; | |
721 | ||
722 | /* If mode timing undefined, just return as no-op: | |
723 | * Happens during initial modesetting of a crtc. | |
724 | */ | |
725 | if (mode->crtc_clock == 0) { | |
02149a76 SR |
726 | drm_dbg_core(dev, "crtc %u: Noop due to uninitialized mode.\n", |
727 | pipe); | |
5a4784f4 | 728 | drm_WARN_ON_ONCE(dev, drm_drv_uses_atomic_modeset(dev)); |
3ed4351a DV |
729 | return false; |
730 | } | |
731 | ||
732 | /* Get current scanout position with system timestamp. | |
733 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
734 | * if single query takes longer than max_error nanoseconds. | |
735 | * | |
736 | * This guarantees a tight bound on maximum error if | |
737 | * code gets preempted or delayed for some reason. | |
738 | */ | |
739 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
740 | /* | |
741 | * Get vertical and horizontal scanout position vpos, hpos, | |
742 | * and bounding timestamps stime, etime, pre/post query. | |
743 | */ | |
48e67807 TZ |
744 | vbl_status = get_scanout_position(crtc, in_vblank_irq, |
745 | &vpos, &hpos, | |
746 | &stime, &etime, | |
747 | mode); | |
3ed4351a DV |
748 | |
749 | /* Return as no-op if scanout query unsupported or failed. */ | |
750 | if (!vbl_status) { | |
02149a76 SR |
751 | drm_dbg_core(dev, |
752 | "crtc %u : scanoutpos query failed.\n", | |
753 | pipe); | |
3ed4351a DV |
754 | return false; |
755 | } | |
756 | ||
757 | /* Compute uncertainty in timestamp of scanout position query. */ | |
758 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); | |
759 | ||
760 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
761 | if (duration_ns <= *max_error) | |
762 | break; | |
763 | } | |
764 | ||
765 | /* Noisy system timing? */ | |
766 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
02149a76 SR |
767 | drm_dbg_core(dev, |
768 | "crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", | |
769 | pipe, duration_ns / 1000, *max_error / 1000, i); | |
3ed4351a DV |
770 | } |
771 | ||
772 | /* Return upper bound of timestamp precision error. */ | |
773 | *max_error = duration_ns; | |
774 | ||
775 | /* Convert scanout position into elapsed time at raw_time query | |
776 | * since start of scanout at first display scanline. delta_ns | |
777 | * can be negative if start of scanout hasn't happened yet. | |
778 | */ | |
779 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), | |
780 | mode->crtc_clock); | |
781 | ||
3ed4351a DV |
782 | /* Subtract time delta from raw timestamp to get final |
783 | * vblank_time timestamp for end of vblank. | |
784 | */ | |
bcbec31c VS |
785 | *vblank_time = ktime_sub_ns(etime, delta_ns); |
786 | ||
f0a8f533 | 787 | if (!drm_debug_enabled(DRM_UT_VBL)) |
bcbec31c VS |
788 | return true; |
789 | ||
790 | ts_etime = ktime_to_timespec64(etime); | |
791 | ts_vblank_time = ktime_to_timespec64(*vblank_time); | |
3ed4351a | 792 | |
02149a76 SR |
793 | drm_dbg_vbl(dev, |
794 | "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n", | |
795 | pipe, hpos, vpos, | |
796 | (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000, | |
797 | (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, | |
798 | duration_ns / 1000, i); | |
3ed4351a DV |
799 | |
800 | return true; | |
801 | } | |
f1e2b637 | 802 | EXPORT_SYMBOL(drm_crtc_vblank_helper_get_vblank_timestamp_internal); |
3ed4351a | 803 | |
7fe3f0d1 TZ |
804 | /** |
805 | * drm_crtc_vblank_helper_get_vblank_timestamp - precise vblank timestamp | |
806 | * helper | |
807 | * @crtc: CRTC whose vblank timestamp to retrieve | |
808 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
809 | * On return contains true maximum error of timestamp | |
810 | * @vblank_time: Pointer to time which should receive the timestamp | |
811 | * @in_vblank_irq: | |
812 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
813 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
814 | * if flag is set. | |
815 | * | |
816 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
817 | * timings and current video scanout position of a CRTC. This can be directly | |
818 | * used as the &drm_crtc_funcs.get_vblank_timestamp implementation of a kms | |
819 | * driver if &drm_crtc_helper_funcs.get_scanout_position is implemented. | |
820 | * | |
821 | * The current implementation only handles standard video modes. For double scan | |
822 | * and interlaced modes the driver is supposed to adjust the hardware mode | |
823 | * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to | |
824 | * match the scanout position reported. | |
825 | * | |
826 | * Note that atomic drivers must call drm_calc_timestamping_constants() before | |
827 | * enabling a CRTC. The atomic helpers already take care of that in | |
441959eb | 828 | * drm_atomic_helper_calc_timestamping_constants(). |
7fe3f0d1 TZ |
829 | * |
830 | * Returns: | |
831 | * | |
832 | * Returns true on success, and false on failure, i.e. when no accurate | |
833 | * timestamp could be acquired. | |
834 | */ | |
835 | bool drm_crtc_vblank_helper_get_vblank_timestamp(struct drm_crtc *crtc, | |
836 | int *max_error, | |
837 | ktime_t *vblank_time, | |
838 | bool in_vblank_irq) | |
839 | { | |
840 | return drm_crtc_vblank_helper_get_vblank_timestamp_internal( | |
841 | crtc, max_error, vblank_time, in_vblank_irq, | |
48e67807 | 842 | crtc->helper_private->get_scanout_position); |
7fe3f0d1 TZ |
843 | } |
844 | EXPORT_SYMBOL(drm_crtc_vblank_helper_get_vblank_timestamp); | |
845 | ||
3ed4351a DV |
846 | /** |
847 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
848 | * vblank interval | |
849 | * @dev: DRM device | |
850 | * @pipe: index of CRTC whose vblank timestamp to retrieve | |
67680d3c | 851 | * @tvblank: Pointer to target time which should receive the timestamp |
3ed4351a DV |
852 | * @in_vblank_irq: |
853 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
854 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
855 | * if flag is set. | |
856 | * | |
857 | * Fetches the system timestamp corresponding to the time of the most recent | |
858 | * vblank interval on specified CRTC. May call into kms-driver to | |
859 | * compute the timestamp with a high-precision GPU specific method. | |
860 | * | |
861 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
862 | * call, i.e., it isn't very precisely locked to the true vblank. | |
863 | * | |
864 | * Returns: | |
865 | * True if timestamp is considered to be very precise, false otherwise. | |
866 | */ | |
867 | static bool | |
868 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 869 | ktime_t *tvblank, bool in_vblank_irq) |
3ed4351a | 870 | { |
7fe3f0d1 | 871 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
3ed4351a DV |
872 | bool ret = false; |
873 | ||
874 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
875 | int max_error = (int) drm_timestamp_precision * 1000; | |
876 | ||
877 | /* Query driver if possible and precision timestamping enabled. */ | |
7fe3f0d1 TZ |
878 | if (crtc && crtc->funcs->get_vblank_timestamp && max_error > 0) { |
879 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
880 | ||
881 | ret = crtc->funcs->get_vblank_timestamp(crtc, &max_error, | |
882 | tvblank, in_vblank_irq); | |
7fe3f0d1 | 883 | } |
3ed4351a DV |
884 | |
885 | /* GPU high precision timestamp query unsupported or failed. | |
886 | * Return current monotonic/gettimeofday timestamp as best estimate. | |
887 | */ | |
888 | if (!ret) | |
25e1a798 | 889 | *tvblank = ktime_get(); |
3ed4351a DV |
890 | |
891 | return ret; | |
892 | } | |
893 | ||
894 | /** | |
895 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
896 | * @crtc: which counter to retrieve | |
897 | * | |
898 | * Fetches the "cooked" vblank count value that represents the number of | |
899 | * vblank events since the system was booted, including lost events due to | |
57d30230 DV |
900 | * modesetting activity. Note that this timer isn't correct against a racing |
901 | * vblank interrupt (since it only reports the software vblank counter), see | |
ca814b25 | 902 | * drm_crtc_accurate_vblank_count() for such use-cases. |
3ed4351a | 903 | * |
bd7e3f3b DV |
904 | * Note that for a given vblank counter value drm_crtc_handle_vblank() |
905 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() | |
906 | * provide a barrier: Any writes done before calling | |
907 | * drm_crtc_handle_vblank() will be visible to callers of the later | |
0ae865ef | 908 | * functions, if the vblank count is the same or a later one. |
bd7e3f3b DV |
909 | * |
910 | * See also &drm_vblank_crtc.count. | |
911 | * | |
3ed4351a DV |
912 | * Returns: |
913 | * The software vblank counter. | |
914 | */ | |
570e8696 | 915 | u64 drm_crtc_vblank_count(struct drm_crtc *crtc) |
3ed4351a DV |
916 | { |
917 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
918 | } | |
919 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
920 | ||
570e8696 KP |
921 | /** |
922 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the | |
923 | * system timestamp corresponding to that vblank counter value. | |
924 | * @dev: DRM device | |
925 | * @pipe: index of CRTC whose counter to retrieve | |
926 | * @vblanktime: Pointer to ktime_t to receive the vblank timestamp. | |
927 | * | |
928 | * Fetches the "cooked" vblank count value that represents the number of | |
929 | * vblank events since the system was booted, including lost events due to | |
930 | * modesetting activity. Returns corresponding system timestamp of the time | |
931 | * of the vblank interval that corresponds to the current vblank counter value. | |
932 | * | |
933 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
934 | */ | |
935 | static u64 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 936 | ktime_t *vblanktime) |
3ed4351a DV |
937 | { |
938 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
570e8696 | 939 | u64 vblank_count; |
3ed4351a DV |
940 | unsigned int seq; |
941 | ||
5a4784f4 | 942 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) { |
67680d3c | 943 | *vblanktime = 0; |
3ed4351a DV |
944 | return 0; |
945 | } | |
946 | ||
947 | do { | |
948 | seq = read_seqbegin(&vblank->seqlock); | |
bd7e3f3b | 949 | vblank_count = atomic64_read(&vblank->count); |
3ed4351a DV |
950 | *vblanktime = vblank->time; |
951 | } while (read_seqretry(&vblank->seqlock, seq)); | |
952 | ||
953 | return vblank_count; | |
954 | } | |
955 | ||
956 | /** | |
957 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
958 | * and the system timestamp corresponding to that vblank counter value | |
959 | * @crtc: which counter to retrieve | |
67680d3c | 960 | * @vblanktime: Pointer to time to receive the vblank timestamp. |
3ed4351a DV |
961 | * |
962 | * Fetches the "cooked" vblank count value that represents the number of | |
963 | * vblank events since the system was booted, including lost events due to | |
964 | * modesetting activity. Returns corresponding system timestamp of the time | |
965 | * of the vblank interval that corresponds to the current vblank counter value. | |
bd7e3f3b DV |
966 | * |
967 | * Note that for a given vblank counter value drm_crtc_handle_vblank() | |
968 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() | |
969 | * provide a barrier: Any writes done before calling | |
970 | * drm_crtc_handle_vblank() will be visible to callers of the later | |
0ae865ef | 971 | * functions, if the vblank count is the same or a later one. |
bd7e3f3b DV |
972 | * |
973 | * See also &drm_vblank_crtc.count. | |
3ed4351a | 974 | */ |
570e8696 | 975 | u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, |
67680d3c | 976 | ktime_t *vblanktime) |
3ed4351a DV |
977 | { |
978 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
979 | vblanktime); | |
980 | } | |
981 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
982 | ||
983 | static void send_vblank_event(struct drm_device *dev, | |
984 | struct drm_pending_vblank_event *e, | |
570e8696 | 985 | u64 seq, ktime_t now) |
3ed4351a | 986 | { |
bd386e51 | 987 | struct timespec64 tv; |
3ed4351a | 988 | |
bd386e51 KP |
989 | switch (e->event.base.type) { |
990 | case DRM_EVENT_VBLANK: | |
991 | case DRM_EVENT_FLIP_COMPLETE: | |
992 | tv = ktime_to_timespec64(now); | |
993 | e->event.vbl.sequence = seq; | |
994 | /* | |
995 | * e->event is a user space structure, with hardcoded unsigned | |
996 | * 32-bit seconds/microseconds. This is safe as we always use | |
997 | * monotonic timestamps since linux-4.15 | |
998 | */ | |
999 | e->event.vbl.tv_sec = tv.tv_sec; | |
1000 | e->event.vbl.tv_usec = tv.tv_nsec / 1000; | |
1001 | break; | |
3064abfa KP |
1002 | case DRM_EVENT_CRTC_SEQUENCE: |
1003 | if (seq) | |
1004 | e->event.seq.sequence = seq; | |
1005 | e->event.seq.time_ns = ktime_to_ns(now); | |
1006 | break; | |
bd386e51 KP |
1007 | } |
1008 | trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, seq); | |
a78e7a51 VSS |
1009 | /* |
1010 | * Use the same timestamp for any associated fence signal to avoid | |
1011 | * mismatch in timestamps for vsync & fence events triggered by the | |
1012 | * same HW event. Frameworks like SurfaceFlinger in Android expects the | |
1013 | * retire-fence timestamp to match exactly with HW vsync as it uses it | |
1014 | * for its software vsync modeling. | |
1015 | */ | |
1016 | drm_send_event_timestamp_locked(dev, &e->base, now); | |
3ed4351a DV |
1017 | } |
1018 | ||
1019 | /** | |
1020 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip | |
1021 | * @crtc: the source CRTC of the vblank event | |
1022 | * @e: the event to send | |
1023 | * | |
1024 | * A lot of drivers need to generate vblank events for the very next vblank | |
1025 | * interrupt. For example when the page flip interrupt happens when the page | |
1026 | * flip gets armed, but not when it actually executes within the next vblank | |
1027 | * period. This helper function implements exactly the required vblank arming | |
1028 | * behaviour. | |
1029 | * | |
1030 | * NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an | |
1031 | * atomic commit must ensure that the next vblank happens at exactly the same | |
1032 | * time as the atomic commit is committed to the hardware. This function itself | |
e13a0583 | 1033 | * does **not** protect against the next vblank interrupt racing with either this |
3ed4351a DV |
1034 | * function call or the atomic commit operation. A possible sequence could be: |
1035 | * | |
1036 | * 1. Driver commits new hardware state into vblank-synchronized registers. | |
1037 | * 2. A vblank happens, committing the hardware state. Also the corresponding | |
1038 | * vblank interrupt is fired off and fully processed by the interrupt | |
1039 | * handler. | |
1040 | * 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event(). | |
1041 | * 4. The event is only send out for the next vblank, which is wrong. | |
1042 | * | |
1043 | * An equivalent race can happen when the driver calls | |
1044 | * drm_crtc_arm_vblank_event() before writing out the new hardware state. | |
1045 | * | |
1046 | * The only way to make this work safely is to prevent the vblank from firing | |
1047 | * (and the hardware from committing anything else) until the entire atomic | |
1048 | * commit sequence has run to completion. If the hardware does not have such a | |
1049 | * feature (e.g. using a "go" bit), then it is unsafe to use this functions. | |
1050 | * Instead drivers need to manually send out the event from their interrupt | |
1051 | * handler by calling drm_crtc_send_vblank_event() and make sure that there's no | |
1052 | * possible race with the hardware committing the atomic update. | |
1053 | * | |
e750218d SA |
1054 | * Caller must hold a vblank reference for the event @e acquired by a |
1055 | * drm_crtc_vblank_get(), which will be dropped when the next vblank arrives. | |
3ed4351a DV |
1056 | */ |
1057 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, | |
1058 | struct drm_pending_vblank_event *e) | |
1059 | { | |
1060 | struct drm_device *dev = crtc->dev; | |
1061 | unsigned int pipe = drm_crtc_index(crtc); | |
1062 | ||
1063 | assert_spin_locked(&dev->event_lock); | |
1064 | ||
1065 | e->pipe = pipe; | |
570e8696 | 1066 | e->sequence = drm_crtc_accurate_vblank_count(crtc) + 1; |
3ed4351a DV |
1067 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
1068 | } | |
1069 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); | |
1070 | ||
1071 | /** | |
1072 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
1073 | * @crtc: the source CRTC of the vblank event | |
1074 | * @e: the event to send | |
1075 | * | |
1076 | * Updates sequence # and timestamp on event for the most recently processed | |
1077 | * vblank, and sends it to userspace. Caller must hold event lock. | |
1078 | * | |
1079 | * See drm_crtc_arm_vblank_event() for a helper which can be used in certain | |
1080 | * situation, especially to send out events for atomic commit operations. | |
1081 | */ | |
1082 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
1083 | struct drm_pending_vblank_event *e) | |
1084 | { | |
1085 | struct drm_device *dev = crtc->dev; | |
570e8696 KP |
1086 | u64 seq; |
1087 | unsigned int pipe = drm_crtc_index(crtc); | |
67680d3c | 1088 | ktime_t now; |
3ed4351a | 1089 | |
6015002e | 1090 | if (drm_dev_has_vblank(dev)) { |
3ed4351a DV |
1091 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1092 | } else { | |
1093 | seq = 0; | |
1094 | ||
25e1a798 | 1095 | now = ktime_get(); |
3ed4351a DV |
1096 | } |
1097 | e->pipe = pipe; | |
67680d3c | 1098 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1099 | } |
1100 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
1101 | ||
1102 | static int __enable_vblank(struct drm_device *dev, unsigned int pipe) | |
1103 | { | |
1104 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1105 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
1106 | ||
5a4784f4 | 1107 | if (drm_WARN_ON(dev, !crtc)) |
4ffb8dee JM |
1108 | return 0; |
1109 | ||
3ed4351a DV |
1110 | if (crtc->funcs->enable_vblank) |
1111 | return crtc->funcs->enable_vblank(crtc); | |
57bb1ee6 DV |
1112 | } |
1113 | #ifdef CONFIG_DRM_LEGACY | |
1114 | else if (dev->driver->enable_vblank) { | |
f397d66b | 1115 | return dev->driver->enable_vblank(dev, pipe); |
3ed4351a | 1116 | } |
57bb1ee6 | 1117 | #endif |
3ed4351a | 1118 | |
f397d66b | 1119 | return -EINVAL; |
3ed4351a DV |
1120 | } |
1121 | ||
3ed4351a DV |
1122 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
1123 | { | |
1124 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1125 | int ret = 0; | |
1126 | ||
1127 | assert_spin_locked(&dev->vbl_lock); | |
1128 | ||
1129 | spin_lock(&dev->vblank_time_lock); | |
1130 | ||
1131 | if (!vblank->enabled) { | |
1132 | /* | |
1133 | * Enable vblank irqs under vblank_time_lock protection. | |
1134 | * All vblank count & timestamp updates are held off | |
1135 | * until we are done reinitializing master counter and | |
1136 | * timestamps. Filtercode in drm_handle_vblank() will | |
1137 | * prevent double-accounting of same vblank interval. | |
1138 | */ | |
1139 | ret = __enable_vblank(dev, pipe); | |
02149a76 SR |
1140 | drm_dbg_core(dev, "enabling vblank on crtc %u, ret: %d\n", |
1141 | pipe, ret); | |
3ed4351a DV |
1142 | if (ret) { |
1143 | atomic_dec(&vblank->refcount); | |
1144 | } else { | |
1145 | drm_update_vblank_count(dev, pipe, 0); | |
1146 | /* drm_update_vblank_count() includes a wmb so we just | |
1147 | * need to ensure that the compiler emits the write | |
1148 | * to mark the vblank as enabled after the call | |
1149 | * to drm_update_vblank_count(). | |
1150 | */ | |
1151 | WRITE_ONCE(vblank->enabled, true); | |
1152 | } | |
1153 | } | |
1154 | ||
1155 | spin_unlock(&dev->vblank_time_lock); | |
1156 | ||
1157 | return ret; | |
1158 | } | |
1159 | ||
5e6c2b4f | 1160 | int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
3ed4351a DV |
1161 | { |
1162 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1163 | unsigned long irqflags; | |
1164 | int ret = 0; | |
1165 | ||
6015002e | 1166 | if (!drm_dev_has_vblank(dev)) |
3ed4351a DV |
1167 | return -EINVAL; |
1168 | ||
5a4784f4 | 1169 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1170 | return -EINVAL; |
1171 | ||
1172 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1173 | /* Going from 0->1 means we have to enable interrupts again */ | |
1174 | if (atomic_add_return(1, &vblank->refcount) == 1) { | |
1175 | ret = drm_vblank_enable(dev, pipe); | |
1176 | } else { | |
1177 | if (!vblank->enabled) { | |
1178 | atomic_dec(&vblank->refcount); | |
1179 | ret = -EINVAL; | |
1180 | } | |
1181 | } | |
1182 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1183 | ||
1184 | return ret; | |
1185 | } | |
1186 | ||
1187 | /** | |
1188 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1189 | * @crtc: which CRTC to own | |
1190 | * | |
1191 | * Acquire a reference count on vblank events to avoid having them disabled | |
1192 | * while in use. | |
1193 | * | |
1194 | * Returns: | |
1195 | * Zero on success or a negative error code on failure. | |
1196 | */ | |
1197 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1198 | { | |
1199 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1200 | } | |
1201 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1202 | ||
5e6c2b4f | 1203 | void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
3ed4351a DV |
1204 | { |
1205 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1206 | ||
5a4784f4 | 1207 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1208 | return; |
1209 | ||
5a4784f4 | 1210 | if (drm_WARN_ON(dev, atomic_read(&vblank->refcount) == 0)) |
3ed4351a DV |
1211 | return; |
1212 | ||
1213 | /* Last user schedules interrupt disable */ | |
1214 | if (atomic_dec_and_test(&vblank->refcount)) { | |
1215 | if (drm_vblank_offdelay == 0) | |
1216 | return; | |
1217 | else if (drm_vblank_offdelay < 0) | |
e99e88a9 | 1218 | vblank_disable_fn(&vblank->disable_timer); |
3ed4351a DV |
1219 | else if (!dev->vblank_disable_immediate) |
1220 | mod_timer(&vblank->disable_timer, | |
1221 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1222 | } | |
1223 | } | |
1224 | ||
1225 | /** | |
1226 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1227 | * @crtc: which counter to give up | |
1228 | * | |
1229 | * Release ownership of a given vblank counter, turning off interrupts | |
1230 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1231 | */ | |
1232 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1233 | { | |
1234 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1235 | } | |
1236 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1237 | ||
1238 | /** | |
1239 | * drm_wait_one_vblank - wait for one vblank | |
1240 | * @dev: DRM device | |
1241 | * @pipe: CRTC index | |
1242 | * | |
1243 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. | |
1244 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
1245 | * due to lack of driver support or because the crtc is off. | |
57d30230 DV |
1246 | * |
1247 | * This is the legacy version of drm_crtc_wait_one_vblank(). | |
3ed4351a DV |
1248 | */ |
1249 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) | |
1250 | { | |
1251 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1252 | int ret; | |
3b765c0b | 1253 | u64 last; |
3ed4351a | 1254 | |
5a4784f4 | 1255 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1256 | return; |
1257 | ||
1258 | ret = drm_vblank_get(dev, pipe); | |
5a4784f4 SR |
1259 | if (drm_WARN(dev, ret, "vblank not available on crtc %i, ret=%i\n", |
1260 | pipe, ret)) | |
3ed4351a DV |
1261 | return; |
1262 | ||
1263 | last = drm_vblank_count(dev, pipe); | |
1264 | ||
1265 | ret = wait_event_timeout(vblank->queue, | |
1266 | last != drm_vblank_count(dev, pipe), | |
1267 | msecs_to_jiffies(100)); | |
1268 | ||
5a4784f4 | 1269 | drm_WARN(dev, ret == 0, "vblank wait timed out on crtc %i\n", pipe); |
3ed4351a DV |
1270 | |
1271 | drm_vblank_put(dev, pipe); | |
1272 | } | |
1273 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1274 | ||
1275 | /** | |
1276 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1277 | * @crtc: DRM crtc | |
1278 | * | |
1279 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1280 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1281 | * due to lack of driver support or because the crtc is off. | |
1282 | */ | |
1283 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1284 | { | |
1285 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1286 | } | |
1287 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1288 | ||
1289 | /** | |
1290 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1291 | * @crtc: CRTC in question | |
1292 | * | |
1293 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1294 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1295 | * stored so that drm_vblank_on can restore it again. | |
1296 | * | |
1297 | * Drivers must use this function when the hardware vblank counter can get | |
57d30230 | 1298 | * reset, e.g. when suspending or disabling the @crtc in general. |
3ed4351a DV |
1299 | */ |
1300 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1301 | { | |
1302 | struct drm_device *dev = crtc->dev; | |
1303 | unsigned int pipe = drm_crtc_index(crtc); | |
1304 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1305 | struct drm_pending_vblank_event *e, *t; | |
67680d3c | 1306 | ktime_t now; |
570e8696 | 1307 | u64 seq; |
3ed4351a | 1308 | |
5a4784f4 | 1309 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1310 | return; |
1311 | ||
5e6c2b4f LP |
1312 | /* |
1313 | * Grab event_lock early to prevent vblank work from being scheduled | |
1314 | * while we're in the middle of shutting down vblank interrupts | |
1315 | */ | |
a7e3ad5f | 1316 | spin_lock_irq(&dev->event_lock); |
3ed4351a DV |
1317 | |
1318 | spin_lock(&dev->vbl_lock); | |
02149a76 SR |
1319 | drm_dbg_vbl(dev, "crtc %d, vblank enabled %d, inmodeset %d\n", |
1320 | pipe, vblank->enabled, vblank->inmodeset); | |
3ed4351a DV |
1321 | |
1322 | /* Avoid redundant vblank disables without previous | |
1323 | * drm_crtc_vblank_on(). */ | |
1324 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) | |
1325 | drm_vblank_disable_and_save(dev, pipe); | |
1326 | ||
1327 | wake_up(&vblank->queue); | |
1328 | ||
1329 | /* | |
1330 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1331 | * the vblank interrupt by bumping the refcount. | |
1332 | */ | |
1333 | if (!vblank->inmodeset) { | |
1334 | atomic_inc(&vblank->refcount); | |
1335 | vblank->inmodeset = 1; | |
1336 | } | |
1337 | spin_unlock(&dev->vbl_lock); | |
1338 | ||
1339 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
1340 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1341 | ||
1342 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1343 | if (e->pipe != pipe) | |
1344 | continue; | |
02149a76 SR |
1345 | drm_dbg_core(dev, "Sending premature vblank event on disable: " |
1346 | "wanted %llu, current %llu\n", | |
1347 | e->sequence, seq); | |
3ed4351a DV |
1348 | list_del(&e->base.link); |
1349 | drm_vblank_put(dev, pipe); | |
67680d3c | 1350 | send_vblank_event(dev, e, seq, now); |
3ed4351a | 1351 | } |
5e6c2b4f LP |
1352 | |
1353 | /* Cancel any leftover pending vblank work */ | |
1354 | drm_vblank_cancel_pending_works(vblank); | |
1355 | ||
a7e3ad5f | 1356 | spin_unlock_irq(&dev->event_lock); |
3ed4351a DV |
1357 | |
1358 | /* Will be reset by the modeset helpers when re-enabling the crtc by | |
1359 | * calling drm_calc_timestamping_constants(). */ | |
1360 | vblank->hwmode.crtc_clock = 0; | |
5e6c2b4f LP |
1361 | |
1362 | /* Wait for any vblank work that's still executing to finish */ | |
1363 | drm_vblank_flush_worker(vblank); | |
3ed4351a DV |
1364 | } |
1365 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1366 | ||
1367 | /** | |
1368 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
1369 | * @crtc: CRTC in question | |
1370 | * | |
1371 | * Drivers can use this function to reset the vblank state to off at load time. | |
1372 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1373 | * drm_crtc_vblank_on() functions. The difference compared to | |
1374 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1375 | * and hence doesn't need to call any driver hooks. | |
57d30230 DV |
1376 | * |
1377 | * This is useful for recovering driver state e.g. on driver load, or on resume. | |
3ed4351a DV |
1378 | */ |
1379 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) | |
1380 | { | |
1381 | struct drm_device *dev = crtc->dev; | |
3ed4351a DV |
1382 | unsigned int pipe = drm_crtc_index(crtc); |
1383 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1384 | ||
fbc678e8 | 1385 | spin_lock_irq(&dev->vbl_lock); |
3ed4351a DV |
1386 | /* |
1387 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1388 | * interrupt by bumping the refcount. | |
1389 | */ | |
1390 | if (!vblank->inmodeset) { | |
1391 | atomic_inc(&vblank->refcount); | |
1392 | vblank->inmodeset = 1; | |
1393 | } | |
fbc678e8 | 1394 | spin_unlock_irq(&dev->vbl_lock); |
3ed4351a | 1395 | |
5a4784f4 | 1396 | drm_WARN_ON(dev, !list_empty(&dev->vblank_event_list)); |
5e6c2b4f | 1397 | drm_WARN_ON(dev, !list_empty(&vblank->pending_work)); |
3ed4351a DV |
1398 | } |
1399 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1400 | ||
ed20151a VS |
1401 | /** |
1402 | * drm_crtc_set_max_vblank_count - configure the hw max vblank counter value | |
1403 | * @crtc: CRTC in question | |
1404 | * @max_vblank_count: max hardware vblank counter value | |
1405 | * | |
1406 | * Update the maximum hardware vblank counter value for @crtc | |
1407 | * at runtime. Useful for hardware where the operation of the | |
1408 | * hardware vblank counter depends on the currently active | |
1409 | * display configuration. | |
1410 | * | |
1411 | * For example, if the hardware vblank counter does not work | |
1412 | * when a specific connector is active the maximum can be set | |
1413 | * to zero. And when that specific connector isn't active the | |
1414 | * maximum can again be set to the appropriate non-zero value. | |
1415 | * | |
1416 | * If used, must be called before drm_vblank_on(). | |
1417 | */ | |
1418 | void drm_crtc_set_max_vblank_count(struct drm_crtc *crtc, | |
1419 | u32 max_vblank_count) | |
1420 | { | |
1421 | struct drm_device *dev = crtc->dev; | |
1422 | unsigned int pipe = drm_crtc_index(crtc); | |
1423 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1424 | ||
5a4784f4 SR |
1425 | drm_WARN_ON(dev, dev->max_vblank_count); |
1426 | drm_WARN_ON(dev, !READ_ONCE(vblank->inmodeset)); | |
ed20151a VS |
1427 | |
1428 | vblank->max_vblank_count = max_vblank_count; | |
1429 | } | |
1430 | EXPORT_SYMBOL(drm_crtc_set_max_vblank_count); | |
1431 | ||
3ed4351a DV |
1432 | /** |
1433 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1434 | * @crtc: CRTC in question | |
1435 | * | |
1436 | * This functions restores the vblank interrupt state captured with | |
57d30230 DV |
1437 | * drm_crtc_vblank_off() again and is generally called when enabling @crtc. Note |
1438 | * that calls to drm_crtc_vblank_on() and drm_crtc_vblank_off() can be | |
1439 | * unbalanced and so can also be unconditionally called in driver load code to | |
1440 | * reflect the current hardware state of the crtc. | |
3ed4351a DV |
1441 | */ |
1442 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1443 | { | |
1444 | struct drm_device *dev = crtc->dev; | |
1445 | unsigned int pipe = drm_crtc_index(crtc); | |
1446 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
3ed4351a | 1447 | |
5a4784f4 | 1448 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1449 | return; |
1450 | ||
92cc68e3 | 1451 | spin_lock_irq(&dev->vbl_lock); |
02149a76 SR |
1452 | drm_dbg_vbl(dev, "crtc %d, vblank enabled %d, inmodeset %d\n", |
1453 | pipe, vblank->enabled, vblank->inmodeset); | |
3ed4351a DV |
1454 | |
1455 | /* Drop our private "prevent drm_vblank_get" refcount */ | |
1456 | if (vblank->inmodeset) { | |
1457 | atomic_dec(&vblank->refcount); | |
1458 | vblank->inmodeset = 0; | |
1459 | } | |
1460 | ||
1461 | drm_reset_vblank_timestamp(dev, pipe); | |
1462 | ||
1463 | /* | |
1464 | * re-enable interrupts if there are users left, or the | |
1465 | * user wishes vblank interrupts to be enabled all the time. | |
1466 | */ | |
1467 | if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) | |
5a4784f4 | 1468 | drm_WARN_ON(dev, drm_vblank_enable(dev, pipe)); |
92cc68e3 | 1469 | spin_unlock_irq(&dev->vbl_lock); |
3ed4351a DV |
1470 | } |
1471 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1472 | ||
f66aaab8 | 1473 | static void drm_vblank_restore(struct drm_device *dev, unsigned int pipe) |
d0bb96b4 DP |
1474 | { |
1475 | ktime_t t_vblank; | |
1476 | struct drm_vblank_crtc *vblank; | |
1477 | int framedur_ns; | |
1478 | u64 diff_ns; | |
1479 | u32 cur_vblank, diff = 1; | |
1480 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
167b4002 | 1481 | u32 max_vblank_count = drm_max_vblank_count(dev, pipe); |
d0bb96b4 | 1482 | |
5a4784f4 | 1483 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
d0bb96b4 DP |
1484 | return; |
1485 | ||
1486 | assert_spin_locked(&dev->vbl_lock); | |
1487 | assert_spin_locked(&dev->vblank_time_lock); | |
1488 | ||
1489 | vblank = &dev->vblank[pipe]; | |
5a4784f4 SR |
1490 | drm_WARN_ONCE(dev, |
1491 | drm_debug_enabled(DRM_UT_VBL) && !vblank->framedur_ns, | |
1492 | "Cannot compute missed vblanks without frame duration\n"); | |
d0bb96b4 DP |
1493 | framedur_ns = vblank->framedur_ns; |
1494 | ||
1495 | do { | |
1496 | cur_vblank = __get_vblank_counter(dev, pipe); | |
1497 | drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false); | |
1498 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
1499 | ||
1500 | diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); | |
1501 | if (framedur_ns) | |
1502 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |
1503 | ||
1504 | ||
02149a76 SR |
1505 | drm_dbg_vbl(dev, |
1506 | "missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n", | |
1507 | diff, diff_ns, framedur_ns, cur_vblank - vblank->last); | |
167b4002 | 1508 | vblank->last = (cur_vblank - diff) & max_vblank_count; |
d0bb96b4 | 1509 | } |
d0bb96b4 DP |
1510 | |
1511 | /** | |
ea3f0ef3 DP |
1512 | * drm_crtc_vblank_restore - estimate missed vblanks and update vblank count. |
1513 | * @crtc: CRTC in question | |
1514 | * | |
d0bb96b4 | 1515 | * Power manamement features can cause frame counter resets between vblank |
ea3f0ef3 DP |
1516 | * disable and enable. Drivers can use this function in their |
1517 | * &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since | |
1518 | * the last &drm_crtc_funcs.disable_vblank using timestamps and update the | |
1519 | * vblank counter. | |
f66aaab8 DV |
1520 | * |
1521 | * Note that drivers must have race-free high-precision timestamping support, | |
1522 | * i.e. &drm_crtc_funcs.get_vblank_timestamp must be hooked up and | |
1523 | * &drm_driver.vblank_disable_immediate must be set to indicate the | |
1524 | * time-stamping functions are race-free against vblank hardware counter | |
1525 | * increments. | |
d0bb96b4 DP |
1526 | */ |
1527 | void drm_crtc_vblank_restore(struct drm_crtc *crtc) | |
1528 | { | |
f66aaab8 DV |
1529 | WARN_ON_ONCE(!crtc->funcs->get_vblank_timestamp); |
1530 | WARN_ON_ONCE(!crtc->dev->vblank_disable_immediate); | |
1531 | ||
d0bb96b4 DP |
1532 | drm_vblank_restore(crtc->dev, drm_crtc_index(crtc)); |
1533 | } | |
1534 | EXPORT_SYMBOL(drm_crtc_vblank_restore); | |
1535 | ||
3ed4351a DV |
1536 | static void drm_legacy_vblank_pre_modeset(struct drm_device *dev, |
1537 | unsigned int pipe) | |
1538 | { | |
1539 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1540 | ||
1541 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
6015002e | 1542 | if (!drm_dev_has_vblank(dev)) |
3ed4351a DV |
1543 | return; |
1544 | ||
5a4784f4 | 1545 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1546 | return; |
1547 | ||
1548 | /* | |
1549 | * To avoid all the problems that might happen if interrupts | |
1550 | * were enabled/disabled around or between these calls, we just | |
1551 | * have the kernel take a reference on the CRTC (just once though | |
1552 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1553 | * so that interrupts remain enabled in the interim. | |
1554 | */ | |
1555 | if (!vblank->inmodeset) { | |
1556 | vblank->inmodeset = 0x1; | |
1557 | if (drm_vblank_get(dev, pipe) == 0) | |
1558 | vblank->inmodeset |= 0x2; | |
1559 | } | |
1560 | } | |
1561 | ||
1562 | static void drm_legacy_vblank_post_modeset(struct drm_device *dev, | |
1563 | unsigned int pipe) | |
1564 | { | |
1565 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
3ed4351a DV |
1566 | |
1567 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
6015002e | 1568 | if (!drm_dev_has_vblank(dev)) |
3ed4351a DV |
1569 | return; |
1570 | ||
5a4784f4 | 1571 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1572 | return; |
1573 | ||
1574 | if (vblank->inmodeset) { | |
eb2ee0ef | 1575 | spin_lock_irq(&dev->vbl_lock); |
3ed4351a | 1576 | drm_reset_vblank_timestamp(dev, pipe); |
eb2ee0ef | 1577 | spin_unlock_irq(&dev->vbl_lock); |
3ed4351a DV |
1578 | |
1579 | if (vblank->inmodeset & 0x2) | |
1580 | drm_vblank_put(dev, pipe); | |
1581 | ||
1582 | vblank->inmodeset = 0; | |
1583 | } | |
1584 | } | |
1585 | ||
b6dcaaac DV |
1586 | int drm_legacy_modeset_ctl_ioctl(struct drm_device *dev, void *data, |
1587 | struct drm_file *file_priv) | |
3ed4351a DV |
1588 | { |
1589 | struct drm_modeset_ctl *modeset = data; | |
1590 | unsigned int pipe; | |
1591 | ||
1592 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
6015002e | 1593 | if (!drm_dev_has_vblank(dev)) |
3ed4351a DV |
1594 | return 0; |
1595 | ||
1596 | /* KMS drivers handle this internally */ | |
1597 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) | |
1598 | return 0; | |
1599 | ||
1600 | pipe = modeset->crtc; | |
1601 | if (pipe >= dev->num_crtcs) | |
1602 | return -EINVAL; | |
1603 | ||
1604 | switch (modeset->cmd) { | |
1605 | case _DRM_PRE_MODESET: | |
1606 | drm_legacy_vblank_pre_modeset(dev, pipe); | |
1607 | break; | |
1608 | case _DRM_POST_MODESET: | |
1609 | drm_legacy_vblank_post_modeset(dev, pipe); | |
1610 | break; | |
1611 | default: | |
1612 | return -EINVAL; | |
1613 | } | |
1614 | ||
1615 | return 0; | |
1616 | } | |
1617 | ||
3ed4351a | 1618 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, |
570e8696 | 1619 | u64 req_seq, |
3ed4351a DV |
1620 | union drm_wait_vblank *vblwait, |
1621 | struct drm_file *file_priv) | |
1622 | { | |
1623 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1624 | struct drm_pending_vblank_event *e; | |
67680d3c | 1625 | ktime_t now; |
570e8696 | 1626 | u64 seq; |
3ed4351a DV |
1627 | int ret; |
1628 | ||
1629 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
1630 | if (e == NULL) { | |
1631 | ret = -ENOMEM; | |
1632 | goto err_put; | |
1633 | } | |
1634 | ||
1635 | e->pipe = pipe; | |
1636 | e->event.base.type = DRM_EVENT_VBLANK; | |
bd386e51 KP |
1637 | e->event.base.length = sizeof(e->event.vbl); |
1638 | e->event.vbl.user_data = vblwait->request.signal; | |
1639 | e->event.vbl.crtc_id = 0; | |
1640 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1641 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
948de842 | 1642 | |
bd386e51 KP |
1643 | if (crtc) |
1644 | e->event.vbl.crtc_id = crtc->base.id; | |
1645 | } | |
3ed4351a | 1646 | |
7f07c35f | 1647 | spin_lock_irq(&dev->event_lock); |
3ed4351a DV |
1648 | |
1649 | /* | |
1650 | * drm_crtc_vblank_off() might have been called after we called | |
1651 | * drm_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |
1652 | * vblank disable, so no need for further locking. The reference from | |
1653 | * drm_vblank_get() protects against vblank disable from another source. | |
1654 | */ | |
1655 | if (!READ_ONCE(vblank->enabled)) { | |
1656 | ret = -EINVAL; | |
1657 | goto err_unlock; | |
1658 | } | |
1659 | ||
1660 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |
1661 | &e->event.base); | |
1662 | ||
1663 | if (ret) | |
1664 | goto err_unlock; | |
1665 | ||
1666 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1667 | ||
02149a76 SR |
1668 | drm_dbg_core(dev, "event on vblank count %llu, current %llu, crtc %u\n", |
1669 | req_seq, seq, pipe); | |
3ed4351a | 1670 | |
570e8696 | 1671 | trace_drm_vblank_event_queued(file_priv, pipe, req_seq); |
3ed4351a | 1672 | |
570e8696 | 1673 | e->sequence = req_seq; |
5e6c2b4f | 1674 | if (drm_vblank_passed(seq, req_seq)) { |
3ed4351a | 1675 | drm_vblank_put(dev, pipe); |
67680d3c | 1676 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1677 | vblwait->reply.sequence = seq; |
1678 | } else { | |
1679 | /* drm_handle_vblank_events will call drm_vblank_put */ | |
1680 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
570e8696 | 1681 | vblwait->reply.sequence = req_seq; |
3ed4351a DV |
1682 | } |
1683 | ||
7f07c35f | 1684 | spin_unlock_irq(&dev->event_lock); |
3ed4351a DV |
1685 | |
1686 | return 0; | |
1687 | ||
1688 | err_unlock: | |
7f07c35f | 1689 | spin_unlock_irq(&dev->event_lock); |
3ed4351a DV |
1690 | kfree(e); |
1691 | err_put: | |
1692 | drm_vblank_put(dev, pipe); | |
1693 | return ret; | |
1694 | } | |
1695 | ||
1696 | static bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait) | |
1697 | { | |
1698 | if (vblwait->request.sequence) | |
1699 | return false; | |
1700 | ||
1701 | return _DRM_VBLANK_RELATIVE == | |
1702 | (vblwait->request.type & (_DRM_VBLANK_TYPES_MASK | | |
1703 | _DRM_VBLANK_EVENT | | |
1704 | _DRM_VBLANK_NEXTONMISS)); | |
1705 | } | |
1706 | ||
570e8696 KP |
1707 | /* |
1708 | * Widen a 32-bit param to 64-bits. | |
1709 | * | |
1710 | * \param narrow 32-bit value (missing upper 32 bits) | |
1711 | * \param near 64-bit value that should be 'close' to near | |
1712 | * | |
1713 | * This function returns a 64-bit value using the lower 32-bits from | |
1714 | * 'narrow' and constructing the upper 32-bits so that the result is | |
1715 | * as close as possible to 'near'. | |
1716 | */ | |
1717 | ||
1718 | static u64 widen_32_to_64(u32 narrow, u64 near) | |
1719 | { | |
1720 | return near + (s32) (narrow - near); | |
1721 | } | |
1722 | ||
67680d3c AB |
1723 | static void drm_wait_vblank_reply(struct drm_device *dev, unsigned int pipe, |
1724 | struct drm_wait_vblank_reply *reply) | |
1725 | { | |
1726 | ktime_t now; | |
1727 | struct timespec64 ts; | |
1728 | ||
1729 | /* | |
1730 | * drm_wait_vblank_reply is a UAPI structure that uses 'long' | |
25e1a798 AB |
1731 | * to store the seconds. This is safe as we always use monotonic |
1732 | * timestamps since linux-4.15. | |
67680d3c AB |
1733 | */ |
1734 | reply->sequence = drm_vblank_count_and_time(dev, pipe, &now); | |
1735 | ts = ktime_to_timespec64(now); | |
1736 | reply->tval_sec = (u32)ts.tv_sec; | |
1737 | reply->tval_usec = ts.tv_nsec / 1000; | |
1738 | } | |
1739 | ||
1e4cd78e TZ |
1740 | static bool drm_wait_vblank_supported(struct drm_device *dev) |
1741 | { | |
c1736b90 TZ |
1742 | #if IS_ENABLED(CONFIG_DRM_LEGACY) |
1743 | if (unlikely(drm_core_check_feature(dev, DRIVER_LEGACY))) | |
1744 | return dev->irq_enabled; | |
1745 | #endif | |
1e4cd78e TZ |
1746 | return drm_dev_has_vblank(dev); |
1747 | } | |
1748 | ||
b6dcaaac DV |
1749 | int drm_wait_vblank_ioctl(struct drm_device *dev, void *data, |
1750 | struct drm_file *file_priv) | |
3ed4351a | 1751 | { |
7de440db | 1752 | struct drm_crtc *crtc; |
3ed4351a DV |
1753 | struct drm_vblank_crtc *vblank; |
1754 | union drm_wait_vblank *vblwait = data; | |
1755 | int ret; | |
570e8696 | 1756 | u64 req_seq, seq; |
7de440db | 1757 | unsigned int pipe_index; |
570e8696 | 1758 | unsigned int flags, pipe, high_pipe; |
3ed4351a | 1759 | |
1e4cd78e | 1760 | if (!drm_wait_vblank_supported(dev)) |
aed6105b | 1761 | return -EOPNOTSUPP; |
3ed4351a DV |
1762 | |
1763 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) | |
1764 | return -EINVAL; | |
1765 | ||
1766 | if (vblwait->request.type & | |
1767 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1768 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
02149a76 SR |
1769 | drm_dbg_core(dev, |
1770 | "Unsupported type value 0x%x, supported mask 0x%x\n", | |
1771 | vblwait->request.type, | |
1772 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1773 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
3ed4351a DV |
1774 | return -EINVAL; |
1775 | } | |
1776 | ||
1777 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; | |
1778 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); | |
1779 | if (high_pipe) | |
7de440db | 1780 | pipe_index = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; |
3ed4351a | 1781 | else |
7de440db KP |
1782 | pipe_index = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1783 | ||
1784 | /* Convert lease-relative crtc index into global crtc index */ | |
1785 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1786 | pipe = 0; | |
1787 | drm_for_each_crtc(crtc, dev) { | |
1788 | if (drm_lease_held(file_priv, crtc->base.id)) { | |
1789 | if (pipe_index == 0) | |
1790 | break; | |
1791 | pipe_index--; | |
1792 | } | |
1793 | pipe++; | |
1794 | } | |
1795 | } else { | |
1796 | pipe = pipe_index; | |
1797 | } | |
1798 | ||
3ed4351a DV |
1799 | if (pipe >= dev->num_crtcs) |
1800 | return -EINVAL; | |
1801 | ||
1802 | vblank = &dev->vblank[pipe]; | |
1803 | ||
1804 | /* If the counter is currently enabled and accurate, short-circuit | |
1805 | * queries to return the cached timestamp of the last vblank. | |
1806 | */ | |
1807 | if (dev->vblank_disable_immediate && | |
1808 | drm_wait_vblank_is_query(vblwait) && | |
1809 | READ_ONCE(vblank->enabled)) { | |
67680d3c | 1810 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
3ed4351a DV |
1811 | return 0; |
1812 | } | |
1813 | ||
1814 | ret = drm_vblank_get(dev, pipe); | |
1815 | if (ret) { | |
02149a76 SR |
1816 | drm_dbg_core(dev, |
1817 | "crtc %d failed to acquire vblank counter, %d\n", | |
1818 | pipe, ret); | |
3ed4351a DV |
1819 | return ret; |
1820 | } | |
1821 | seq = drm_vblank_count(dev, pipe); | |
1822 | ||
1823 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { | |
1824 | case _DRM_VBLANK_RELATIVE: | |
570e8696 KP |
1825 | req_seq = seq + vblwait->request.sequence; |
1826 | vblwait->request.sequence = req_seq; | |
3ed4351a | 1827 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; |
570e8696 | 1828 | break; |
3ed4351a | 1829 | case _DRM_VBLANK_ABSOLUTE: |
570e8696 | 1830 | req_seq = widen_32_to_64(vblwait->request.sequence, seq); |
3ed4351a DV |
1831 | break; |
1832 | default: | |
1833 | ret = -EINVAL; | |
1834 | goto done; | |
1835 | } | |
1836 | ||
1837 | if ((flags & _DRM_VBLANK_NEXTONMISS) && | |
5e6c2b4f | 1838 | drm_vblank_passed(seq, req_seq)) { |
570e8696 KP |
1839 | req_seq = seq + 1; |
1840 | vblwait->request.type &= ~_DRM_VBLANK_NEXTONMISS; | |
1841 | vblwait->request.sequence = req_seq; | |
1842 | } | |
3ed4351a DV |
1843 | |
1844 | if (flags & _DRM_VBLANK_EVENT) { | |
1845 | /* must hold on to the vblank ref until the event fires | |
1846 | * drm_vblank_put will be called asynchronously | |
1847 | */ | |
570e8696 | 1848 | return drm_queue_vblank_event(dev, pipe, req_seq, vblwait, file_priv); |
3ed4351a DV |
1849 | } |
1850 | ||
570e8696 | 1851 | if (req_seq != seq) { |
05103ea9 SR |
1852 | int wait; |
1853 | ||
02149a76 SR |
1854 | drm_dbg_core(dev, "waiting on vblank count %llu, crtc %u\n", |
1855 | req_seq, pipe); | |
05103ea9 | 1856 | wait = wait_event_interruptible_timeout(vblank->queue, |
5e6c2b4f | 1857 | drm_vblank_passed(drm_vblank_count(dev, pipe), req_seq) || |
05103ea9 SR |
1858 | !READ_ONCE(vblank->enabled), |
1859 | msecs_to_jiffies(3000)); | |
1860 | ||
1861 | switch (wait) { | |
1862 | case 0: | |
1863 | /* timeout */ | |
1864 | ret = -EBUSY; | |
1865 | break; | |
1866 | case -ERESTARTSYS: | |
1867 | /* interrupted by signal */ | |
1868 | ret = -EINTR; | |
1869 | break; | |
1870 | default: | |
1871 | ret = 0; | |
1872 | break; | |
1873 | } | |
3ed4351a DV |
1874 | } |
1875 | ||
1876 | if (ret != -EINTR) { | |
67680d3c | 1877 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
3ed4351a | 1878 | |
02149a76 SR |
1879 | drm_dbg_core(dev, "crtc %d returning %u to client\n", |
1880 | pipe, vblwait->reply.sequence); | |
3ed4351a | 1881 | } else { |
02149a76 SR |
1882 | drm_dbg_core(dev, "crtc %d vblank wait interrupted by signal\n", |
1883 | pipe); | |
3ed4351a DV |
1884 | } |
1885 | ||
1886 | done: | |
1887 | drm_vblank_put(dev, pipe); | |
1888 | return ret; | |
1889 | } | |
1890 | ||
1891 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) | |
1892 | { | |
7fe3f0d1 TZ |
1893 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
1894 | bool high_prec = false; | |
3ed4351a | 1895 | struct drm_pending_vblank_event *e, *t; |
67680d3c | 1896 | ktime_t now; |
570e8696 | 1897 | u64 seq; |
3ed4351a DV |
1898 | |
1899 | assert_spin_locked(&dev->event_lock); | |
1900 | ||
1901 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1902 | ||
1903 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1904 | if (e->pipe != pipe) | |
1905 | continue; | |
5e6c2b4f | 1906 | if (!drm_vblank_passed(seq, e->sequence)) |
3ed4351a DV |
1907 | continue; |
1908 | ||
02149a76 SR |
1909 | drm_dbg_core(dev, "vblank event on %llu, current %llu\n", |
1910 | e->sequence, seq); | |
3ed4351a DV |
1911 | |
1912 | list_del(&e->base.link); | |
1913 | drm_vblank_put(dev, pipe); | |
67680d3c | 1914 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1915 | } |
1916 | ||
7fe3f0d1 TZ |
1917 | if (crtc && crtc->funcs->get_vblank_timestamp) |
1918 | high_prec = true; | |
7fe3f0d1 TZ |
1919 | |
1920 | trace_drm_vblank_event(pipe, seq, now, high_prec); | |
3ed4351a DV |
1921 | } |
1922 | ||
1923 | /** | |
1924 | * drm_handle_vblank - handle a vblank event | |
1925 | * @dev: DRM device | |
1926 | * @pipe: index of CRTC where this event occurred | |
1927 | * | |
1928 | * Drivers should call this routine in their vblank interrupt handlers to | |
1929 | * update the vblank counter and send any signals that may be pending. | |
1930 | * | |
1931 | * This is the legacy version of drm_crtc_handle_vblank(). | |
1932 | */ | |
1933 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) | |
1934 | { | |
1935 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1936 | unsigned long irqflags; | |
1937 | bool disable_irq; | |
1938 | ||
5a4784f4 | 1939 | if (drm_WARN_ON_ONCE(dev, !drm_dev_has_vblank(dev))) |
3ed4351a DV |
1940 | return false; |
1941 | ||
5a4784f4 | 1942 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1943 | return false; |
1944 | ||
1945 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1946 | ||
1947 | /* Need timestamp lock to prevent concurrent execution with | |
1948 | * vblank enable/disable, as this would cause inconsistent | |
1949 | * or corrupted timestamps and vblank counts. | |
1950 | */ | |
1951 | spin_lock(&dev->vblank_time_lock); | |
1952 | ||
1953 | /* Vblank irq handling disabled. Nothing to do. */ | |
1954 | if (!vblank->enabled) { | |
1955 | spin_unlock(&dev->vblank_time_lock); | |
1956 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1957 | return false; | |
1958 | } | |
1959 | ||
1960 | drm_update_vblank_count(dev, pipe, true); | |
1961 | ||
1962 | spin_unlock(&dev->vblank_time_lock); | |
1963 | ||
1964 | wake_up(&vblank->queue); | |
1965 | ||
1966 | /* With instant-off, we defer disabling the interrupt until after | |
1967 | * we finish processing the following vblank after all events have | |
1968 | * been signaled. The disable has to be last (after | |
1969 | * drm_handle_vblank_events) so that the timestamp is always accurate. | |
1970 | */ | |
1971 | disable_irq = (dev->vblank_disable_immediate && | |
1972 | drm_vblank_offdelay > 0 && | |
1973 | !atomic_read(&vblank->refcount)); | |
1974 | ||
1975 | drm_handle_vblank_events(dev, pipe); | |
5e6c2b4f | 1976 | drm_handle_vblank_works(vblank); |
3ed4351a DV |
1977 | |
1978 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1979 | ||
1980 | if (disable_irq) | |
e99e88a9 | 1981 | vblank_disable_fn(&vblank->disable_timer); |
3ed4351a DV |
1982 | |
1983 | return true; | |
1984 | } | |
1985 | EXPORT_SYMBOL(drm_handle_vblank); | |
1986 | ||
1987 | /** | |
1988 | * drm_crtc_handle_vblank - handle a vblank event | |
1989 | * @crtc: where this event occurred | |
1990 | * | |
1991 | * Drivers should call this routine in their vblank interrupt handlers to | |
1992 | * update the vblank counter and send any signals that may be pending. | |
1993 | * | |
1994 | * This is the native KMS version of drm_handle_vblank(). | |
1995 | * | |
bd7e3f3b DV |
1996 | * Note that for a given vblank counter value drm_crtc_handle_vblank() |
1997 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() | |
1998 | * provide a barrier: Any writes done before calling | |
1999 | * drm_crtc_handle_vblank() will be visible to callers of the later | |
0ae865ef | 2000 | * functions, if the vblank count is the same or a later one. |
bd7e3f3b DV |
2001 | * |
2002 | * See also &drm_vblank_crtc.count. | |
2003 | * | |
3ed4351a DV |
2004 | * Returns: |
2005 | * True if the event was successfully handled, false on failure. | |
2006 | */ | |
2007 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
2008 | { | |
2009 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
2010 | } | |
2011 | EXPORT_SYMBOL(drm_crtc_handle_vblank); | |
3064abfa KP |
2012 | |
2013 | /* | |
2014 | * Get crtc VBLANK count. | |
2015 | * | |
2016 | * \param dev DRM device | |
0ae865ef | 2017 | * \param data user argument, pointing to a drm_crtc_get_sequence structure. |
3064abfa KP |
2018 | * \param file_priv drm file private for the user's open file descriptor |
2019 | */ | |
2020 | ||
2021 | int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data, | |
2022 | struct drm_file *file_priv) | |
2023 | { | |
2024 | struct drm_crtc *crtc; | |
2025 | struct drm_vblank_crtc *vblank; | |
2026 | int pipe; | |
2027 | struct drm_crtc_get_sequence *get_seq = data; | |
2028 | ktime_t now; | |
2029 | bool vblank_enabled; | |
2030 | int ret; | |
2031 | ||
2032 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
69fdf420 | 2033 | return -EOPNOTSUPP; |
3064abfa | 2034 | |
1e4cd78e | 2035 | if (!drm_dev_has_vblank(dev)) |
aed6105b | 2036 | return -EOPNOTSUPP; |
3064abfa KP |
2037 | |
2038 | crtc = drm_crtc_find(dev, file_priv, get_seq->crtc_id); | |
2039 | if (!crtc) | |
2040 | return -ENOENT; | |
2041 | ||
2042 | pipe = drm_crtc_index(crtc); | |
2043 | ||
2044 | vblank = &dev->vblank[pipe]; | |
2045 | vblank_enabled = dev->vblank_disable_immediate && READ_ONCE(vblank->enabled); | |
2046 | ||
2047 | if (!vblank_enabled) { | |
2048 | ret = drm_crtc_vblank_get(crtc); | |
2049 | if (ret) { | |
02149a76 SR |
2050 | drm_dbg_core(dev, |
2051 | "crtc %d failed to acquire vblank counter, %d\n", | |
2052 | pipe, ret); | |
3064abfa KP |
2053 | return ret; |
2054 | } | |
2055 | } | |
2056 | drm_modeset_lock(&crtc->mutex, NULL); | |
2057 | if (crtc->state) | |
2058 | get_seq->active = crtc->state->enable; | |
2059 | else | |
2060 | get_seq->active = crtc->enabled; | |
2061 | drm_modeset_unlock(&crtc->mutex); | |
2062 | get_seq->sequence = drm_vblank_count_and_time(dev, pipe, &now); | |
2063 | get_seq->sequence_ns = ktime_to_ns(now); | |
2064 | if (!vblank_enabled) | |
2065 | drm_crtc_vblank_put(crtc); | |
2066 | return 0; | |
2067 | } | |
2068 | ||
2069 | /* | |
2070 | * Queue a event for VBLANK sequence | |
2071 | * | |
2072 | * \param dev DRM device | |
0ae865ef | 2073 | * \param data user argument, pointing to a drm_crtc_queue_sequence structure. |
3064abfa KP |
2074 | * \param file_priv drm file private for the user's open file descriptor |
2075 | */ | |
2076 | ||
2077 | int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data, | |
2078 | struct drm_file *file_priv) | |
2079 | { | |
2080 | struct drm_crtc *crtc; | |
2081 | struct drm_vblank_crtc *vblank; | |
2082 | int pipe; | |
2083 | struct drm_crtc_queue_sequence *queue_seq = data; | |
2084 | ktime_t now; | |
2085 | struct drm_pending_vblank_event *e; | |
2086 | u32 flags; | |
2087 | u64 seq; | |
2088 | u64 req_seq; | |
2089 | int ret; | |
3064abfa KP |
2090 | |
2091 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
69fdf420 | 2092 | return -EOPNOTSUPP; |
3064abfa | 2093 | |
1e4cd78e | 2094 | if (!drm_dev_has_vblank(dev)) |
aed6105b | 2095 | return -EOPNOTSUPP; |
3064abfa KP |
2096 | |
2097 | crtc = drm_crtc_find(dev, file_priv, queue_seq->crtc_id); | |
2098 | if (!crtc) | |
2099 | return -ENOENT; | |
2100 | ||
2101 | flags = queue_seq->flags; | |
2102 | /* Check valid flag bits */ | |
2103 | if (flags & ~(DRM_CRTC_SEQUENCE_RELATIVE| | |
2104 | DRM_CRTC_SEQUENCE_NEXT_ON_MISS)) | |
2105 | return -EINVAL; | |
2106 | ||
2107 | pipe = drm_crtc_index(crtc); | |
2108 | ||
2109 | vblank = &dev->vblank[pipe]; | |
2110 | ||
2111 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
2112 | if (e == NULL) | |
2113 | return -ENOMEM; | |
2114 | ||
2115 | ret = drm_crtc_vblank_get(crtc); | |
2116 | if (ret) { | |
02149a76 SR |
2117 | drm_dbg_core(dev, |
2118 | "crtc %d failed to acquire vblank counter, %d\n", | |
2119 | pipe, ret); | |
3064abfa KP |
2120 | goto err_free; |
2121 | } | |
2122 | ||
2123 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
2124 | req_seq = queue_seq->sequence; | |
2125 | ||
2126 | if (flags & DRM_CRTC_SEQUENCE_RELATIVE) | |
2127 | req_seq += seq; | |
2128 | ||
5e6c2b4f | 2129 | if ((flags & DRM_CRTC_SEQUENCE_NEXT_ON_MISS) && drm_vblank_passed(seq, req_seq)) |
3064abfa KP |
2130 | req_seq = seq + 1; |
2131 | ||
2132 | e->pipe = pipe; | |
2133 | e->event.base.type = DRM_EVENT_CRTC_SEQUENCE; | |
2134 | e->event.base.length = sizeof(e->event.seq); | |
2135 | e->event.seq.user_data = queue_seq->user_data; | |
2136 | ||
5887a2ad | 2137 | spin_lock_irq(&dev->event_lock); |
3064abfa KP |
2138 | |
2139 | /* | |
2140 | * drm_crtc_vblank_off() might have been called after we called | |
2141 | * drm_crtc_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |
2142 | * vblank disable, so no need for further locking. The reference from | |
2143 | * drm_crtc_vblank_get() protects against vblank disable from another source. | |
2144 | */ | |
2145 | if (!READ_ONCE(vblank->enabled)) { | |
2146 | ret = -EINVAL; | |
2147 | goto err_unlock; | |
2148 | } | |
2149 | ||
2150 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |
2151 | &e->event.base); | |
2152 | ||
2153 | if (ret) | |
2154 | goto err_unlock; | |
2155 | ||
2156 | e->sequence = req_seq; | |
2157 | ||
5e6c2b4f | 2158 | if (drm_vblank_passed(seq, req_seq)) { |
3064abfa KP |
2159 | drm_crtc_vblank_put(crtc); |
2160 | send_vblank_event(dev, e, seq, now); | |
2161 | queue_seq->sequence = seq; | |
2162 | } else { | |
2163 | /* drm_handle_vblank_events will call drm_vblank_put */ | |
2164 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
2165 | queue_seq->sequence = req_seq; | |
2166 | } | |
2167 | ||
5887a2ad | 2168 | spin_unlock_irq(&dev->event_lock); |
3064abfa KP |
2169 | return 0; |
2170 | ||
2171 | err_unlock: | |
5887a2ad | 2172 | spin_unlock_irq(&dev->event_lock); |
3064abfa KP |
2173 | drm_crtc_vblank_put(crtc); |
2174 | err_free: | |
2175 | kfree(e); | |
2176 | return ret; | |
2177 | } | |
5e6c2b4f | 2178 |