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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> |
0500c04e SR |
28 | #include <linux/moduleparam.h> |
29 | ||
30 | #include <drm/drm_crtc.h> | |
31 | #include <drm/drm_drv.h> | |
32 | #include <drm/drm_framebuffer.h> | |
c23d686f | 33 | #include <drm/drm_managed.h> |
f1e2b637 | 34 | #include <drm/drm_modeset_helper_vtables.h> |
0500c04e | 35 | #include <drm/drm_print.h> |
0500c04e | 36 | #include <drm/drm_vblank.h> |
3ed4351a | 37 | |
3ed4351a | 38 | #include "drm_internal.h" |
0500c04e | 39 | #include "drm_trace.h" |
3ed4351a | 40 | |
57d30230 DV |
41 | /** |
42 | * DOC: vblank handling | |
43 | * | |
56b165fe SR |
44 | * From the computer's perspective, every time the monitor displays |
45 | * a new frame the scanout engine has "scanned out" the display image | |
46 | * from top to bottom, one row of pixels at a time. The current row | |
47 | * of pixels is referred to as the current scanline. | |
48 | * | |
49 | * In addition to the display's visible area, there's usually a couple of | |
50 | * extra scanlines which aren't actually displayed on the screen. | |
51 | * These extra scanlines don't contain image data and are occasionally used | |
52 | * for features like audio and infoframes. The region made up of these | |
53 | * scanlines is referred to as the vertical blanking region, or vblank for | |
54 | * short. | |
55 | * | |
56 | * For historical reference, the vertical blanking period was designed to | |
57 | * give the electron gun (on CRTs) enough time to move back to the top of | |
58 | * the screen to start scanning out the next frame. Similar for horizontal | |
59 | * blanking periods. They were designed to give the electron gun enough | |
60 | * time to move back to the other side of the screen to start scanning the | |
61 | * next scanline. | |
62 | * | |
63 | * :: | |
64 | * | |
65 | * | |
66 | * physical → ⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽ | |
67 | * top of | | | |
68 | * display | | | |
69 | * | New frame | | |
70 | * | | | |
71 | * |↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓| | |
72 | * |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| ← Scanline, | |
73 | * |↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓| updates the | |
74 | * | | frame as it | |
75 | * | | travels down | |
76 | * | | ("sacn out") | |
77 | * | Old frame | | |
78 | * | | | |
79 | * | | | |
80 | * | | | |
81 | * | | physical | |
82 | * | | bottom of | |
83 | * vertical |⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽| ← display | |
84 | * blanking ┆xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx┆ | |
85 | * region → ┆xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx┆ | |
86 | * ┆xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx┆ | |
87 | * start of → ⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽⎽ | |
88 | * new frame | |
89 | * | |
90 | * "Physical top of display" is the reference point for the high-precision/ | |
91 | * corrected timestamp. | |
92 | * | |
93 | * On a lot of display hardware, programming needs to take effect during the | |
94 | * vertical blanking period so that settings like gamma, the image buffer | |
95 | * buffer to be scanned out, etc. can safely be changed without showing | |
96 | * any visual artifacts on the screen. In some unforgiving hardware, some of | |
97 | * this programming has to both start and end in the same vblank. To help | |
98 | * with the timing of the hardware programming, an interrupt is usually | |
99 | * available to notify the driver when it can start the updating of registers. | |
100 | * The interrupt is in this context named the vblank interrupt. | |
101 | * | |
102 | * The vblank interrupt may be fired at different points depending on the | |
103 | * hardware. Some hardware implementations will fire the interrupt when the | |
104 | * new frame start, other implementations will fire the interrupt at different | |
105 | * points in time. | |
106 | * | |
57d30230 DV |
107 | * Vertical blanking plays a major role in graphics rendering. To achieve |
108 | * tear-free display, users must synchronize page flips and/or rendering to | |
109 | * vertical blanking. The DRM API offers ioctls to perform page flips | |
110 | * synchronized to vertical blanking and wait for vertical blanking. | |
111 | * | |
112 | * The DRM core handles most of the vertical blanking management logic, which | |
113 | * involves filtering out spurious interrupts, keeping race-free blanking | |
114 | * counters, coping with counter wrap-around and resets and keeping use counts. | |
115 | * It relies on the driver to generate vertical blanking interrupts and | |
116 | * optionally provide a hardware vertical blanking counter. | |
117 | * | |
118 | * Drivers must initialize the vertical blanking handling core with a call to | |
119 | * drm_vblank_init(). Minimally, a driver needs to implement | |
120 | * &drm_crtc_funcs.enable_vblank and &drm_crtc_funcs.disable_vblank plus call | |
1e55a53a | 121 | * drm_crtc_handle_vblank() in its vblank interrupt handler for working vblank |
57d30230 DV |
122 | * support. |
123 | * | |
124 | * Vertical blanking interrupts can be enabled by the DRM core or by drivers | |
125 | * themselves (for instance to handle page flipping operations). The DRM core | |
126 | * maintains a vertical blanking use count to ensure that the interrupts are not | |
127 | * disabled while a user still needs them. To increment the use count, drivers | |
128 | * call drm_crtc_vblank_get() and release the vblank reference again with | |
129 | * drm_crtc_vblank_put(). In between these two calls vblank interrupts are | |
130 | * guaranteed to be enabled. | |
131 | * | |
132 | * On many hardware disabling the vblank interrupt cannot be done in a race-free | |
133 | * manner, see &drm_driver.vblank_disable_immediate and | |
134 | * &drm_driver.max_vblank_count. In that case the vblank core only disables the | |
135 | * vblanks after a timer has expired, which can be configured through the | |
136 | * ``vblankoffdelay`` module parameter. | |
7beb691f TZ |
137 | * |
138 | * Drivers for hardware without support for vertical-blanking interrupts | |
139 | * must not call drm_vblank_init(). For such drivers, atomic helpers will | |
140 | * automatically generate fake vblank events as part of the display update. | |
141 | * This functionality also can be controlled by the driver by enabling and | |
142 | * disabling struct drm_crtc_state.no_vblank. | |
57d30230 DV |
143 | */ |
144 | ||
3ed4351a DV |
145 | /* Retry timestamp calculation up to 3 times to satisfy |
146 | * drm_timestamp_precision before giving up. | |
147 | */ | |
148 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
149 | ||
150 | /* Threshold in nanoseconds for detection of redundant | |
151 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
152 | */ | |
153 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
154 | ||
155 | static bool | |
156 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 157 | ktime_t *tvblank, bool in_vblank_irq); |
3ed4351a DV |
158 | |
159 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ | |
160 | ||
3ed4351a DV |
161 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ |
162 | ||
163 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
164 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
3ed4351a DV |
165 | MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); |
166 | MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); | |
3ed4351a DV |
167 | |
168 | static void store_vblank(struct drm_device *dev, unsigned int pipe, | |
169 | u32 vblank_count_inc, | |
67680d3c | 170 | ktime_t t_vblank, u32 last) |
3ed4351a DV |
171 | { |
172 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
173 | ||
174 | assert_spin_locked(&dev->vblank_time_lock); | |
175 | ||
176 | vblank->last = last; | |
177 | ||
178 | write_seqlock(&vblank->seqlock); | |
67680d3c | 179 | vblank->time = t_vblank; |
bd7e3f3b | 180 | atomic64_add(vblank_count_inc, &vblank->count); |
3ed4351a DV |
181 | write_sequnlock(&vblank->seqlock); |
182 | } | |
183 | ||
ed20151a VS |
184 | static u32 drm_max_vblank_count(struct drm_device *dev, unsigned int pipe) |
185 | { | |
186 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
187 | ||
188 | return vblank->max_vblank_count ?: dev->max_vblank_count; | |
189 | } | |
190 | ||
3ed4351a DV |
191 | /* |
192 | * "No hw counter" fallback implementation of .get_vblank_counter() hook, | |
193 | * if there is no useable hardware frame counter available. | |
194 | */ | |
195 | static u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) | |
196 | { | |
5a4784f4 | 197 | drm_WARN_ON_ONCE(dev, drm_max_vblank_count(dev, pipe) != 0); |
3ed4351a DV |
198 | return 0; |
199 | } | |
200 | ||
201 | static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe) | |
202 | { | |
203 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
204 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
205 | ||
5a4784f4 | 206 | if (drm_WARN_ON(dev, !crtc)) |
4ffb8dee JM |
207 | return 0; |
208 | ||
3ed4351a DV |
209 | if (crtc->funcs->get_vblank_counter) |
210 | return crtc->funcs->get_vblank_counter(crtc); | |
f397d66b | 211 | } else if (dev->driver->get_vblank_counter) { |
3ed4351a | 212 | return dev->driver->get_vblank_counter(dev, pipe); |
f397d66b | 213 | } |
3ed4351a DV |
214 | |
215 | return drm_vblank_no_hw_counter(dev, pipe); | |
216 | } | |
217 | ||
218 | /* | |
219 | * Reset the stored timestamp for the current vblank count to correspond | |
220 | * to the last vblank occurred. | |
221 | * | |
222 | * Only to be called from drm_crtc_vblank_on(). | |
223 | * | |
224 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes | |
225 | * device vblank fields. | |
226 | */ | |
227 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) | |
228 | { | |
229 | u32 cur_vblank; | |
230 | bool rc; | |
67680d3c | 231 | ktime_t t_vblank; |
3ed4351a DV |
232 | int count = DRM_TIMESTAMP_MAXRETRIES; |
233 | ||
234 | spin_lock(&dev->vblank_time_lock); | |
235 | ||
236 | /* | |
237 | * sample the current counter to avoid random jumps | |
238 | * when drm_vblank_enable() applies the diff | |
239 | */ | |
240 | do { | |
241 | cur_vblank = __get_vblank_counter(dev, pipe); | |
242 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false); | |
243 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
244 | ||
245 | /* | |
246 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
247 | * available and didn't fail. Otherwise reinitialize delayed at next vblank | |
248 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
249 | */ | |
250 | if (!rc) | |
67680d3c | 251 | t_vblank = 0; |
3ed4351a DV |
252 | |
253 | /* | |
254 | * +1 to make sure user will never see the same | |
255 | * vblank counter value before and after a modeset | |
256 | */ | |
67680d3c | 257 | store_vblank(dev, pipe, 1, t_vblank, cur_vblank); |
3ed4351a DV |
258 | |
259 | spin_unlock(&dev->vblank_time_lock); | |
260 | } | |
261 | ||
262 | /* | |
263 | * Call back into the driver to update the appropriate vblank counter | |
264 | * (specified by @pipe). Deal with wraparound, if it occurred, and | |
265 | * update the last read value so we can deal with wraparound on the next | |
266 | * call if necessary. | |
267 | * | |
268 | * Only necessary when going from off->on, to account for frames we | |
269 | * didn't get an interrupt for. | |
270 | * | |
271 | * Note: caller must hold &drm_device.vbl_lock since this reads & writes | |
272 | * device vblank fields. | |
273 | */ | |
274 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, | |
275 | bool in_vblank_irq) | |
276 | { | |
277 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
278 | u32 cur_vblank, diff; | |
279 | bool rc; | |
67680d3c | 280 | ktime_t t_vblank; |
3ed4351a DV |
281 | int count = DRM_TIMESTAMP_MAXRETRIES; |
282 | int framedur_ns = vblank->framedur_ns; | |
ed20151a | 283 | u32 max_vblank_count = drm_max_vblank_count(dev, pipe); |
3ed4351a DV |
284 | |
285 | /* | |
286 | * Interrupts were disabled prior to this call, so deal with counter | |
287 | * wrap if needed. | |
288 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events | |
289 | * here if the register is small or we had vblank interrupts off for | |
290 | * a long time. | |
291 | * | |
292 | * We repeat the hardware vblank counter & timestamp query until | |
293 | * we get consistent results. This to prevent races between gpu | |
294 | * updating its hardware counter while we are retrieving the | |
295 | * corresponding vblank timestamp. | |
296 | */ | |
297 | do { | |
298 | cur_vblank = __get_vblank_counter(dev, pipe); | |
299 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq); | |
300 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
301 | ||
ed20151a | 302 | if (max_vblank_count) { |
3ed4351a | 303 | /* trust the hw counter when it's around */ |
ed20151a | 304 | diff = (cur_vblank - vblank->last) & max_vblank_count; |
3ed4351a | 305 | } else if (rc && framedur_ns) { |
67680d3c | 306 | u64 diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); |
3ed4351a DV |
307 | |
308 | /* | |
309 | * Figure out how many vblanks we've missed based | |
310 | * on the difference in the timestamps and the | |
311 | * frame/field duration. | |
312 | */ | |
41ff5bd8 | 313 | |
02149a76 SR |
314 | drm_dbg_vbl(dev, "crtc %u: Calculating number of vblanks." |
315 | " diff_ns = %lld, framedur_ns = %d)\n", | |
316 | pipe, (long long)diff_ns, framedur_ns); | |
41ff5bd8 | 317 | |
3ed4351a DV |
318 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); |
319 | ||
320 | if (diff == 0 && in_vblank_irq) | |
02149a76 SR |
321 | drm_dbg_vbl(dev, "crtc %u: Redundant vblirq ignored\n", |
322 | pipe); | |
3ed4351a DV |
323 | } else { |
324 | /* some kind of default for drivers w/o accurate vbl timestamping */ | |
325 | diff = in_vblank_irq ? 1 : 0; | |
326 | } | |
327 | ||
328 | /* | |
329 | * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset | |
330 | * interval? If so then vblank irqs keep running and it will likely | |
331 | * happen that the hardware vblank counter is not trustworthy as it | |
332 | * might reset at some point in that interval and vblank timestamps | |
333 | * are not trustworthy either in that interval. Iow. this can result | |
334 | * in a bogus diff >> 1 which must be avoided as it would cause | |
335 | * random large forward jumps of the software vblank counter. | |
336 | */ | |
337 | if (diff > 1 && (vblank->inmodeset & 0x2)) { | |
02149a76 SR |
338 | drm_dbg_vbl(dev, |
339 | "clamping vblank bump to 1 on crtc %u: diffr=%u" | |
340 | " due to pre-modeset.\n", pipe, diff); | |
3ed4351a DV |
341 | diff = 1; |
342 | } | |
343 | ||
02149a76 SR |
344 | drm_dbg_vbl(dev, "updating vblank count on crtc %u:" |
345 | " current=%llu, diff=%u, hw=%u hw_last=%u\n", | |
346 | pipe, (unsigned long long)atomic64_read(&vblank->count), | |
347 | diff, cur_vblank, vblank->last); | |
3ed4351a DV |
348 | |
349 | if (diff == 0) { | |
5a4784f4 | 350 | drm_WARN_ON_ONCE(dev, cur_vblank != vblank->last); |
3ed4351a DV |
351 | return; |
352 | } | |
353 | ||
354 | /* | |
355 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
356 | * available and didn't fail, or we were called from the vblank interrupt. | |
357 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 | |
358 | * for now, to mark the vblanktimestamp as invalid. | |
359 | */ | |
138b87fa | 360 | if (!rc && !in_vblank_irq) |
67680d3c | 361 | t_vblank = 0; |
3ed4351a | 362 | |
67680d3c | 363 | store_vblank(dev, pipe, diff, t_vblank, cur_vblank); |
3ed4351a DV |
364 | } |
365 | ||
3b765c0b | 366 | static u64 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
3ed4351a DV |
367 | { |
368 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
bd7e3f3b | 369 | u64 count; |
3ed4351a | 370 | |
5a4784f4 | 371 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
372 | return 0; |
373 | ||
bd7e3f3b DV |
374 | count = atomic64_read(&vblank->count); |
375 | ||
376 | /* | |
377 | * This read barrier corresponds to the implicit write barrier of the | |
378 | * write seqlock in store_vblank(). Note that this is the only place | |
379 | * where we need an explicit barrier, since all other access goes | |
380 | * through drm_vblank_count_and_time(), which already has the required | |
381 | * read barrier curtesy of the read seqlock. | |
382 | */ | |
383 | smp_rmb(); | |
384 | ||
385 | return count; | |
3ed4351a DV |
386 | } |
387 | ||
388 | /** | |
ca814b25 | 389 | * drm_crtc_accurate_vblank_count - retrieve the master vblank counter |
3ed4351a DV |
390 | * @crtc: which counter to retrieve |
391 | * | |
57d30230 DV |
392 | * This function is similar to drm_crtc_vblank_count() but this function |
393 | * interpolates to handle a race with vblank interrupts using the high precision | |
394 | * timestamping support. | |
3ed4351a | 395 | * |
57d30230 DV |
396 | * This is mostly useful for hardware that can obtain the scanout position, but |
397 | * doesn't have a hardware frame counter. | |
3ed4351a | 398 | */ |
3b765c0b | 399 | u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc) |
3ed4351a DV |
400 | { |
401 | struct drm_device *dev = crtc->dev; | |
402 | unsigned int pipe = drm_crtc_index(crtc); | |
3b765c0b | 403 | u64 vblank; |
3ed4351a DV |
404 | unsigned long flags; |
405 | ||
5a4784f4 SR |
406 | drm_WARN_ONCE(dev, drm_debug_enabled(DRM_UT_VBL) && |
407 | !crtc->funcs->get_vblank_timestamp, | |
408 | "This function requires support for accurate vblank timestamps."); | |
3ed4351a DV |
409 | |
410 | spin_lock_irqsave(&dev->vblank_time_lock, flags); | |
411 | ||
412 | drm_update_vblank_count(dev, pipe, false); | |
413 | vblank = drm_vblank_count(dev, pipe); | |
414 | ||
415 | spin_unlock_irqrestore(&dev->vblank_time_lock, flags); | |
416 | ||
417 | return vblank; | |
418 | } | |
ca814b25 | 419 | EXPORT_SYMBOL(drm_crtc_accurate_vblank_count); |
3ed4351a DV |
420 | |
421 | static void __disable_vblank(struct drm_device *dev, unsigned int pipe) | |
422 | { | |
423 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
424 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
425 | ||
5a4784f4 | 426 | if (drm_WARN_ON(dev, !crtc)) |
4ffb8dee JM |
427 | return; |
428 | ||
f397d66b | 429 | if (crtc->funcs->disable_vblank) |
3ed4351a | 430 | crtc->funcs->disable_vblank(crtc); |
f397d66b TZ |
431 | } else { |
432 | dev->driver->disable_vblank(dev, pipe); | |
3ed4351a | 433 | } |
3ed4351a DV |
434 | } |
435 | ||
436 | /* | |
437 | * Disable vblank irq's on crtc, make sure that last vblank count | |
438 | * of hardware and corresponding consistent software vblank counter | |
439 | * are preserved, even if there are any spurious vblank irq's after | |
440 | * disable. | |
441 | */ | |
442 | void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) | |
443 | { | |
444 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
445 | unsigned long irqflags; | |
446 | ||
447 | assert_spin_locked(&dev->vbl_lock); | |
448 | ||
449 | /* Prevent vblank irq processing while disabling vblank irqs, | |
450 | * so no updates of timestamps or count can happen after we've | |
451 | * disabled. Needed to prevent races in case of delayed irq's. | |
452 | */ | |
453 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
454 | ||
455 | /* | |
68036b08 DP |
456 | * Update vblank count and disable vblank interrupts only if the |
457 | * interrupts were enabled. This avoids calling the ->disable_vblank() | |
458 | * operation in atomic context with the hardware potentially runtime | |
459 | * suspended. | |
3ed4351a | 460 | */ |
68036b08 DP |
461 | if (!vblank->enabled) |
462 | goto out; | |
3ed4351a DV |
463 | |
464 | /* | |
68036b08 | 465 | * Update the count and timestamp to maintain the |
3ed4351a DV |
466 | * appearance that the counter has been ticking all along until |
467 | * this time. This makes the count account for the entire time | |
468 | * between drm_crtc_vblank_on() and drm_crtc_vblank_off(). | |
469 | */ | |
470 | drm_update_vblank_count(dev, pipe, false); | |
68036b08 DP |
471 | __disable_vblank(dev, pipe); |
472 | vblank->enabled = false; | |
3ed4351a | 473 | |
68036b08 | 474 | out: |
3ed4351a DV |
475 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
476 | } | |
477 | ||
e99e88a9 | 478 | static void vblank_disable_fn(struct timer_list *t) |
3ed4351a | 479 | { |
e99e88a9 | 480 | struct drm_vblank_crtc *vblank = from_timer(vblank, t, disable_timer); |
3ed4351a DV |
481 | struct drm_device *dev = vblank->dev; |
482 | unsigned int pipe = vblank->pipe; | |
483 | unsigned long irqflags; | |
484 | ||
485 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
486 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
02149a76 | 487 | drm_dbg_core(dev, "disabling vblank on crtc %u\n", pipe); |
3ed4351a DV |
488 | drm_vblank_disable_and_save(dev, pipe); |
489 | } | |
490 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
491 | } | |
492 | ||
c23d686f | 493 | static void drm_vblank_init_release(struct drm_device *dev, void *ptr) |
3ed4351a DV |
494 | { |
495 | unsigned int pipe; | |
496 | ||
3ed4351a DV |
497 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { |
498 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
499 | ||
5a4784f4 SR |
500 | drm_WARN_ON(dev, READ_ONCE(vblank->enabled) && |
501 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
3ed4351a DV |
502 | |
503 | del_timer_sync(&vblank->disable_timer); | |
504 | } | |
3ed4351a | 505 | } |
3ed4351a DV |
506 | |
507 | /** | |
508 | * drm_vblank_init - initialize vblank support | |
509 | * @dev: DRM device | |
510 | * @num_crtcs: number of CRTCs supported by @dev | |
511 | * | |
512 | * This function initializes vblank support for @num_crtcs display pipelines. | |
c23d686f DV |
513 | * Cleanup is handled automatically through a cleanup function added with |
514 | * drmm_add_action(). | |
3ed4351a DV |
515 | * |
516 | * Returns: | |
517 | * Zero on success or a negative error code on failure. | |
518 | */ | |
519 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) | |
520 | { | |
c23d686f | 521 | int ret; |
3ed4351a DV |
522 | unsigned int i; |
523 | ||
524 | spin_lock_init(&dev->vbl_lock); | |
525 | spin_lock_init(&dev->vblank_time_lock); | |
526 | ||
c23d686f DV |
527 | dev->vblank = drmm_kcalloc(dev, num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
528 | if (!dev->vblank) | |
529 | return -ENOMEM; | |
530 | ||
3ed4351a DV |
531 | dev->num_crtcs = num_crtcs; |
532 | ||
c23d686f DV |
533 | ret = drmm_add_action(dev, drm_vblank_init_release, NULL); |
534 | if (ret) | |
535 | return ret; | |
3ed4351a DV |
536 | |
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 DV |
544 | seqlock_init(&vblank->seqlock); |
545 | } | |
546 | ||
3ed4351a | 547 | return 0; |
3ed4351a DV |
548 | } |
549 | EXPORT_SYMBOL(drm_vblank_init); | |
550 | ||
7beb691f TZ |
551 | /** |
552 | * drm_dev_has_vblank - test if vblanking has been initialized for | |
553 | * a device | |
554 | * @dev: the device | |
555 | * | |
556 | * Drivers may call this function to test if vblank support is | |
557 | * initialized for a device. For most hardware this means that vblanking | |
558 | * can also be enabled. | |
559 | * | |
560 | * Atomic helpers use this function to initialize | |
561 | * &drm_crtc_state.no_vblank. See also drm_atomic_helper_check_modeset(). | |
562 | * | |
563 | * Returns: | |
564 | * True if vblanking has been initialized for the given device, false | |
565 | * otherwise. | |
566 | */ | |
567 | bool drm_dev_has_vblank(const struct drm_device *dev) | |
568 | { | |
569 | return dev->num_crtcs != 0; | |
570 | } | |
571 | EXPORT_SYMBOL(drm_dev_has_vblank); | |
572 | ||
3ed4351a DV |
573 | /** |
574 | * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC | |
575 | * @crtc: which CRTC's vblank waitqueue to retrieve | |
576 | * | |
577 | * This function returns a pointer to the vblank waitqueue for the CRTC. | |
578 | * Drivers can use this to implement vblank waits using wait_event() and related | |
579 | * functions. | |
580 | */ | |
581 | wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc) | |
582 | { | |
583 | return &crtc->dev->vblank[drm_crtc_index(crtc)].queue; | |
584 | } | |
585 | EXPORT_SYMBOL(drm_crtc_vblank_waitqueue); | |
586 | ||
587 | ||
588 | /** | |
589 | * drm_calc_timestamping_constants - calculate vblank timestamp constants | |
590 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
591 | * @mode: display mode containing the scanout timings | |
592 | * | |
57d30230 DV |
593 | * Calculate and store various constants which are later needed by vblank and |
594 | * swap-completion timestamping, e.g, by | |
7fe3f0d1 TZ |
595 | * drm_crtc_vblank_helper_get_vblank_timestamp(). They are derived from |
596 | * CRTC's true scanout timing, so they take things like panel scaling or | |
597 | * other adjustments into account. | |
3ed4351a DV |
598 | */ |
599 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, | |
600 | const struct drm_display_mode *mode) | |
601 | { | |
602 | struct drm_device *dev = crtc->dev; | |
603 | unsigned int pipe = drm_crtc_index(crtc); | |
604 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
605 | int linedur_ns = 0, framedur_ns = 0; | |
606 | int dotclock = mode->crtc_clock; | |
607 | ||
6015002e | 608 | if (!drm_dev_has_vblank(dev)) |
3ed4351a DV |
609 | return; |
610 | ||
5a4784f4 | 611 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
612 | return; |
613 | ||
614 | /* Valid dotclock? */ | |
615 | if (dotclock > 0) { | |
616 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; | |
617 | ||
618 | /* | |
619 | * Convert scanline length in pixels and video | |
620 | * dot clock to line duration and frame duration | |
621 | * in nanoseconds: | |
622 | */ | |
623 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
624 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
625 | ||
626 | /* | |
627 | * Fields of interlaced scanout modes are only half a frame duration. | |
628 | */ | |
629 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
630 | framedur_ns /= 2; | |
02149a76 SR |
631 | } else { |
632 | drm_err(dev, "crtc %u: Can't calculate constants, dotclock = 0!\n", | |
633 | crtc->base.id); | |
634 | } | |
3ed4351a DV |
635 | |
636 | vblank->linedur_ns = linedur_ns; | |
637 | vblank->framedur_ns = framedur_ns; | |
638 | vblank->hwmode = *mode; | |
639 | ||
02149a76 SR |
640 | drm_dbg_core(dev, |
641 | "crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
642 | crtc->base.id, mode->crtc_htotal, | |
643 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
644 | drm_dbg_core(dev, "crtc %u: clock %d kHz framedur %d linedur %d\n", | |
645 | crtc->base.id, dotclock, framedur_ns, linedur_ns); | |
3ed4351a DV |
646 | } |
647 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
648 | ||
f1e2b637 TZ |
649 | /** |
650 | * drm_crtc_vblank_helper_get_vblank_timestamp_internal - precise vblank | |
651 | * timestamp helper | |
099d705d | 652 | * @crtc: CRTC whose vblank timestamp to retrieve |
f1e2b637 TZ |
653 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
654 | * On return contains true maximum error of timestamp | |
655 | * @vblank_time: Pointer to time which should receive the timestamp | |
656 | * @in_vblank_irq: | |
657 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
658 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
659 | * if flag is set. | |
660 | * @get_scanout_position: | |
661 | * Callback function to retrieve the scanout position. See | |
662 | * @struct drm_crtc_helper_funcs.get_scanout_position. | |
f1e2b637 TZ |
663 | * |
664 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
665 | * timings and current video scanout position of a CRTC. | |
666 | * | |
667 | * The current implementation only handles standard video modes. For double scan | |
668 | * and interlaced modes the driver is supposed to adjust the hardware mode | |
669 | * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to | |
670 | * match the scanout position reported. | |
671 | * | |
672 | * Note that atomic drivers must call drm_calc_timestamping_constants() before | |
673 | * enabling a CRTC. The atomic helpers already take care of that in | |
674 | * drm_atomic_helper_update_legacy_modeset_state(). | |
675 | * | |
676 | * Returns: | |
677 | * | |
678 | * Returns true on success, and false on failure, i.e. when no accurate | |
679 | * timestamp could be acquired. | |
680 | */ | |
681 | bool | |
682 | drm_crtc_vblank_helper_get_vblank_timestamp_internal( | |
683 | struct drm_crtc *crtc, int *max_error, ktime_t *vblank_time, | |
684 | bool in_vblank_irq, | |
48e67807 | 685 | drm_vblank_get_scanout_position_func get_scanout_position) |
f1e2b637 TZ |
686 | { |
687 | struct drm_device *dev = crtc->dev; | |
688 | unsigned int pipe = crtc->index; | |
689 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
690 | struct timespec64 ts_etime, ts_vblank_time; | |
691 | ktime_t stime, etime; | |
692 | bool vbl_status; | |
693 | const struct drm_display_mode *mode; | |
694 | int vpos, hpos, i; | |
695 | int delta_ns, duration_ns; | |
696 | ||
697 | if (pipe >= dev->num_crtcs) { | |
02149a76 | 698 | drm_err(dev, "Invalid crtc %u\n", pipe); |
3ed4351a DV |
699 | return false; |
700 | } | |
701 | ||
702 | /* Scanout position query not supported? Should not happen. */ | |
48e67807 | 703 | if (!get_scanout_position) { |
02149a76 | 704 | drm_err(dev, "Called from CRTC w/o get_scanout_position()!?\n"); |
3ed4351a DV |
705 | return false; |
706 | } | |
707 | ||
708 | if (drm_drv_uses_atomic_modeset(dev)) | |
709 | mode = &vblank->hwmode; | |
710 | else | |
711 | mode = &crtc->hwmode; | |
712 | ||
713 | /* If mode timing undefined, just return as no-op: | |
714 | * Happens during initial modesetting of a crtc. | |
715 | */ | |
716 | if (mode->crtc_clock == 0) { | |
02149a76 SR |
717 | drm_dbg_core(dev, "crtc %u: Noop due to uninitialized mode.\n", |
718 | pipe); | |
5a4784f4 | 719 | drm_WARN_ON_ONCE(dev, drm_drv_uses_atomic_modeset(dev)); |
3ed4351a DV |
720 | return false; |
721 | } | |
722 | ||
723 | /* Get current scanout position with system timestamp. | |
724 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
725 | * if single query takes longer than max_error nanoseconds. | |
726 | * | |
727 | * This guarantees a tight bound on maximum error if | |
728 | * code gets preempted or delayed for some reason. | |
729 | */ | |
730 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
731 | /* | |
732 | * Get vertical and horizontal scanout position vpos, hpos, | |
733 | * and bounding timestamps stime, etime, pre/post query. | |
734 | */ | |
48e67807 TZ |
735 | vbl_status = get_scanout_position(crtc, in_vblank_irq, |
736 | &vpos, &hpos, | |
737 | &stime, &etime, | |
738 | mode); | |
3ed4351a DV |
739 | |
740 | /* Return as no-op if scanout query unsupported or failed. */ | |
741 | if (!vbl_status) { | |
02149a76 SR |
742 | drm_dbg_core(dev, |
743 | "crtc %u : scanoutpos query failed.\n", | |
744 | pipe); | |
3ed4351a DV |
745 | return false; |
746 | } | |
747 | ||
748 | /* Compute uncertainty in timestamp of scanout position query. */ | |
749 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); | |
750 | ||
751 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
752 | if (duration_ns <= *max_error) | |
753 | break; | |
754 | } | |
755 | ||
756 | /* Noisy system timing? */ | |
757 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
02149a76 SR |
758 | drm_dbg_core(dev, |
759 | "crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", | |
760 | pipe, duration_ns / 1000, *max_error / 1000, i); | |
3ed4351a DV |
761 | } |
762 | ||
763 | /* Return upper bound of timestamp precision error. */ | |
764 | *max_error = duration_ns; | |
765 | ||
766 | /* Convert scanout position into elapsed time at raw_time query | |
767 | * since start of scanout at first display scanline. delta_ns | |
768 | * can be negative if start of scanout hasn't happened yet. | |
769 | */ | |
770 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), | |
771 | mode->crtc_clock); | |
772 | ||
3ed4351a DV |
773 | /* Subtract time delta from raw timestamp to get final |
774 | * vblank_time timestamp for end of vblank. | |
775 | */ | |
bcbec31c VS |
776 | *vblank_time = ktime_sub_ns(etime, delta_ns); |
777 | ||
f0a8f533 | 778 | if (!drm_debug_enabled(DRM_UT_VBL)) |
bcbec31c VS |
779 | return true; |
780 | ||
781 | ts_etime = ktime_to_timespec64(etime); | |
782 | ts_vblank_time = ktime_to_timespec64(*vblank_time); | |
3ed4351a | 783 | |
02149a76 SR |
784 | drm_dbg_vbl(dev, |
785 | "crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n", | |
786 | pipe, hpos, vpos, | |
787 | (u64)ts_etime.tv_sec, ts_etime.tv_nsec / 1000, | |
788 | (u64)ts_vblank_time.tv_sec, ts_vblank_time.tv_nsec / 1000, | |
789 | duration_ns / 1000, i); | |
3ed4351a DV |
790 | |
791 | return true; | |
792 | } | |
f1e2b637 | 793 | EXPORT_SYMBOL(drm_crtc_vblank_helper_get_vblank_timestamp_internal); |
3ed4351a | 794 | |
7fe3f0d1 TZ |
795 | /** |
796 | * drm_crtc_vblank_helper_get_vblank_timestamp - precise vblank timestamp | |
797 | * helper | |
798 | * @crtc: CRTC whose vblank timestamp to retrieve | |
799 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
800 | * On return contains true maximum error of timestamp | |
801 | * @vblank_time: Pointer to time which should receive the timestamp | |
802 | * @in_vblank_irq: | |
803 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
804 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
805 | * if flag is set. | |
806 | * | |
807 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
808 | * timings and current video scanout position of a CRTC. This can be directly | |
809 | * used as the &drm_crtc_funcs.get_vblank_timestamp implementation of a kms | |
810 | * driver if &drm_crtc_helper_funcs.get_scanout_position is implemented. | |
811 | * | |
812 | * The current implementation only handles standard video modes. For double scan | |
813 | * and interlaced modes the driver is supposed to adjust the hardware mode | |
814 | * (taken from &drm_crtc_state.adjusted mode for atomic modeset drivers) to | |
815 | * match the scanout position reported. | |
816 | * | |
817 | * Note that atomic drivers must call drm_calc_timestamping_constants() before | |
818 | * enabling a CRTC. The atomic helpers already take care of that in | |
819 | * drm_atomic_helper_update_legacy_modeset_state(). | |
820 | * | |
821 | * Returns: | |
822 | * | |
823 | * Returns true on success, and false on failure, i.e. when no accurate | |
824 | * timestamp could be acquired. | |
825 | */ | |
826 | bool drm_crtc_vblank_helper_get_vblank_timestamp(struct drm_crtc *crtc, | |
827 | int *max_error, | |
828 | ktime_t *vblank_time, | |
829 | bool in_vblank_irq) | |
830 | { | |
831 | return drm_crtc_vblank_helper_get_vblank_timestamp_internal( | |
832 | crtc, max_error, vblank_time, in_vblank_irq, | |
48e67807 | 833 | crtc->helper_private->get_scanout_position); |
7fe3f0d1 TZ |
834 | } |
835 | EXPORT_SYMBOL(drm_crtc_vblank_helper_get_vblank_timestamp); | |
836 | ||
3ed4351a DV |
837 | /** |
838 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
839 | * vblank interval | |
840 | * @dev: DRM device | |
841 | * @pipe: index of CRTC whose vblank timestamp to retrieve | |
67680d3c | 842 | * @tvblank: Pointer to target time which should receive the timestamp |
3ed4351a DV |
843 | * @in_vblank_irq: |
844 | * True when called from drm_crtc_handle_vblank(). Some drivers | |
845 | * need to apply some workarounds for gpu-specific vblank irq quirks | |
846 | * if flag is set. | |
847 | * | |
848 | * Fetches the system timestamp corresponding to the time of the most recent | |
849 | * vblank interval on specified CRTC. May call into kms-driver to | |
850 | * compute the timestamp with a high-precision GPU specific method. | |
851 | * | |
852 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
853 | * call, i.e., it isn't very precisely locked to the true vblank. | |
854 | * | |
855 | * Returns: | |
856 | * True if timestamp is considered to be very precise, false otherwise. | |
857 | */ | |
858 | static bool | |
859 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 860 | ktime_t *tvblank, bool in_vblank_irq) |
3ed4351a | 861 | { |
7fe3f0d1 | 862 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
3ed4351a DV |
863 | bool ret = false; |
864 | ||
865 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
866 | int max_error = (int) drm_timestamp_precision * 1000; | |
867 | ||
868 | /* Query driver if possible and precision timestamping enabled. */ | |
7fe3f0d1 TZ |
869 | if (crtc && crtc->funcs->get_vblank_timestamp && max_error > 0) { |
870 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
871 | ||
872 | ret = crtc->funcs->get_vblank_timestamp(crtc, &max_error, | |
873 | tvblank, in_vblank_irq); | |
7fe3f0d1 | 874 | } |
3ed4351a DV |
875 | |
876 | /* GPU high precision timestamp query unsupported or failed. | |
877 | * Return current monotonic/gettimeofday timestamp as best estimate. | |
878 | */ | |
879 | if (!ret) | |
25e1a798 | 880 | *tvblank = ktime_get(); |
3ed4351a DV |
881 | |
882 | return ret; | |
883 | } | |
884 | ||
885 | /** | |
886 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
887 | * @crtc: which counter to retrieve | |
888 | * | |
889 | * Fetches the "cooked" vblank count value that represents the number of | |
890 | * vblank events since the system was booted, including lost events due to | |
57d30230 DV |
891 | * modesetting activity. Note that this timer isn't correct against a racing |
892 | * vblank interrupt (since it only reports the software vblank counter), see | |
ca814b25 | 893 | * drm_crtc_accurate_vblank_count() for such use-cases. |
3ed4351a | 894 | * |
bd7e3f3b DV |
895 | * Note that for a given vblank counter value drm_crtc_handle_vblank() |
896 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() | |
897 | * provide a barrier: Any writes done before calling | |
898 | * drm_crtc_handle_vblank() will be visible to callers of the later | |
899 | * functions, iff the vblank count is the same or a later one. | |
900 | * | |
901 | * See also &drm_vblank_crtc.count. | |
902 | * | |
3ed4351a DV |
903 | * Returns: |
904 | * The software vblank counter. | |
905 | */ | |
570e8696 | 906 | u64 drm_crtc_vblank_count(struct drm_crtc *crtc) |
3ed4351a DV |
907 | { |
908 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
909 | } | |
910 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
911 | ||
570e8696 KP |
912 | /** |
913 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the | |
914 | * system timestamp corresponding to that vblank counter value. | |
915 | * @dev: DRM device | |
916 | * @pipe: index of CRTC whose counter to retrieve | |
917 | * @vblanktime: Pointer to ktime_t to receive the vblank timestamp. | |
918 | * | |
919 | * Fetches the "cooked" vblank count value that represents the number of | |
920 | * vblank events since the system was booted, including lost events due to | |
921 | * modesetting activity. Returns corresponding system timestamp of the time | |
922 | * of the vblank interval that corresponds to the current vblank counter value. | |
923 | * | |
924 | * This is the legacy version of drm_crtc_vblank_count_and_time(). | |
925 | */ | |
926 | static u64 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, | |
67680d3c | 927 | ktime_t *vblanktime) |
3ed4351a DV |
928 | { |
929 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
570e8696 | 930 | u64 vblank_count; |
3ed4351a DV |
931 | unsigned int seq; |
932 | ||
5a4784f4 | 933 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) { |
67680d3c | 934 | *vblanktime = 0; |
3ed4351a DV |
935 | return 0; |
936 | } | |
937 | ||
938 | do { | |
939 | seq = read_seqbegin(&vblank->seqlock); | |
bd7e3f3b | 940 | vblank_count = atomic64_read(&vblank->count); |
3ed4351a DV |
941 | *vblanktime = vblank->time; |
942 | } while (read_seqretry(&vblank->seqlock, seq)); | |
943 | ||
944 | return vblank_count; | |
945 | } | |
946 | ||
947 | /** | |
948 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value | |
949 | * and the system timestamp corresponding to that vblank counter value | |
950 | * @crtc: which counter to retrieve | |
67680d3c | 951 | * @vblanktime: Pointer to time to receive the vblank timestamp. |
3ed4351a DV |
952 | * |
953 | * Fetches the "cooked" vblank count value that represents the number of | |
954 | * vblank events since the system was booted, including lost events due to | |
955 | * modesetting activity. Returns corresponding system timestamp of the time | |
956 | * of the vblank interval that corresponds to the current vblank counter value. | |
bd7e3f3b DV |
957 | * |
958 | * Note that for a given vblank counter value drm_crtc_handle_vblank() | |
959 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() | |
960 | * provide a barrier: Any writes done before calling | |
961 | * drm_crtc_handle_vblank() will be visible to callers of the later | |
962 | * functions, iff the vblank count is the same or a later one. | |
963 | * | |
964 | * See also &drm_vblank_crtc.count. | |
3ed4351a | 965 | */ |
570e8696 | 966 | u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, |
67680d3c | 967 | ktime_t *vblanktime) |
3ed4351a DV |
968 | { |
969 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), | |
970 | vblanktime); | |
971 | } | |
972 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); | |
973 | ||
974 | static void send_vblank_event(struct drm_device *dev, | |
975 | struct drm_pending_vblank_event *e, | |
570e8696 | 976 | u64 seq, ktime_t now) |
3ed4351a | 977 | { |
bd386e51 | 978 | struct timespec64 tv; |
3ed4351a | 979 | |
bd386e51 KP |
980 | switch (e->event.base.type) { |
981 | case DRM_EVENT_VBLANK: | |
982 | case DRM_EVENT_FLIP_COMPLETE: | |
983 | tv = ktime_to_timespec64(now); | |
984 | e->event.vbl.sequence = seq; | |
985 | /* | |
986 | * e->event is a user space structure, with hardcoded unsigned | |
987 | * 32-bit seconds/microseconds. This is safe as we always use | |
988 | * monotonic timestamps since linux-4.15 | |
989 | */ | |
990 | e->event.vbl.tv_sec = tv.tv_sec; | |
991 | e->event.vbl.tv_usec = tv.tv_nsec / 1000; | |
992 | break; | |
3064abfa KP |
993 | case DRM_EVENT_CRTC_SEQUENCE: |
994 | if (seq) | |
995 | e->event.seq.sequence = seq; | |
996 | e->event.seq.time_ns = ktime_to_ns(now); | |
997 | break; | |
bd386e51 KP |
998 | } |
999 | trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, seq); | |
3ed4351a DV |
1000 | drm_send_event_locked(dev, &e->base); |
1001 | } | |
1002 | ||
1003 | /** | |
1004 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip | |
1005 | * @crtc: the source CRTC of the vblank event | |
1006 | * @e: the event to send | |
1007 | * | |
1008 | * A lot of drivers need to generate vblank events for the very next vblank | |
1009 | * interrupt. For example when the page flip interrupt happens when the page | |
1010 | * flip gets armed, but not when it actually executes within the next vblank | |
1011 | * period. This helper function implements exactly the required vblank arming | |
1012 | * behaviour. | |
1013 | * | |
1014 | * NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an | |
1015 | * atomic commit must ensure that the next vblank happens at exactly the same | |
1016 | * time as the atomic commit is committed to the hardware. This function itself | |
e13a0583 | 1017 | * does **not** protect against the next vblank interrupt racing with either this |
3ed4351a DV |
1018 | * function call or the atomic commit operation. A possible sequence could be: |
1019 | * | |
1020 | * 1. Driver commits new hardware state into vblank-synchronized registers. | |
1021 | * 2. A vblank happens, committing the hardware state. Also the corresponding | |
1022 | * vblank interrupt is fired off and fully processed by the interrupt | |
1023 | * handler. | |
1024 | * 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event(). | |
1025 | * 4. The event is only send out for the next vblank, which is wrong. | |
1026 | * | |
1027 | * An equivalent race can happen when the driver calls | |
1028 | * drm_crtc_arm_vblank_event() before writing out the new hardware state. | |
1029 | * | |
1030 | * The only way to make this work safely is to prevent the vblank from firing | |
1031 | * (and the hardware from committing anything else) until the entire atomic | |
1032 | * commit sequence has run to completion. If the hardware does not have such a | |
1033 | * feature (e.g. using a "go" bit), then it is unsafe to use this functions. | |
1034 | * Instead drivers need to manually send out the event from their interrupt | |
1035 | * handler by calling drm_crtc_send_vblank_event() and make sure that there's no | |
1036 | * possible race with the hardware committing the atomic update. | |
1037 | * | |
e750218d SA |
1038 | * Caller must hold a vblank reference for the event @e acquired by a |
1039 | * drm_crtc_vblank_get(), which will be dropped when the next vblank arrives. | |
3ed4351a DV |
1040 | */ |
1041 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, | |
1042 | struct drm_pending_vblank_event *e) | |
1043 | { | |
1044 | struct drm_device *dev = crtc->dev; | |
1045 | unsigned int pipe = drm_crtc_index(crtc); | |
1046 | ||
1047 | assert_spin_locked(&dev->event_lock); | |
1048 | ||
1049 | e->pipe = pipe; | |
570e8696 | 1050 | e->sequence = drm_crtc_accurate_vblank_count(crtc) + 1; |
3ed4351a DV |
1051 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
1052 | } | |
1053 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); | |
1054 | ||
1055 | /** | |
1056 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
1057 | * @crtc: the source CRTC of the vblank event | |
1058 | * @e: the event to send | |
1059 | * | |
1060 | * Updates sequence # and timestamp on event for the most recently processed | |
1061 | * vblank, and sends it to userspace. Caller must hold event lock. | |
1062 | * | |
1063 | * See drm_crtc_arm_vblank_event() for a helper which can be used in certain | |
1064 | * situation, especially to send out events for atomic commit operations. | |
1065 | */ | |
1066 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
1067 | struct drm_pending_vblank_event *e) | |
1068 | { | |
1069 | struct drm_device *dev = crtc->dev; | |
570e8696 KP |
1070 | u64 seq; |
1071 | unsigned int pipe = drm_crtc_index(crtc); | |
67680d3c | 1072 | ktime_t now; |
3ed4351a | 1073 | |
6015002e | 1074 | if (drm_dev_has_vblank(dev)) { |
3ed4351a DV |
1075 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1076 | } else { | |
1077 | seq = 0; | |
1078 | ||
25e1a798 | 1079 | now = ktime_get(); |
3ed4351a DV |
1080 | } |
1081 | e->pipe = pipe; | |
67680d3c | 1082 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1083 | } |
1084 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
1085 | ||
1086 | static int __enable_vblank(struct drm_device *dev, unsigned int pipe) | |
1087 | { | |
1088 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1089 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
1090 | ||
5a4784f4 | 1091 | if (drm_WARN_ON(dev, !crtc)) |
4ffb8dee JM |
1092 | return 0; |
1093 | ||
3ed4351a DV |
1094 | if (crtc->funcs->enable_vblank) |
1095 | return crtc->funcs->enable_vblank(crtc); | |
f397d66b TZ |
1096 | } else if (dev->driver->enable_vblank) { |
1097 | return dev->driver->enable_vblank(dev, pipe); | |
3ed4351a DV |
1098 | } |
1099 | ||
f397d66b | 1100 | return -EINVAL; |
3ed4351a DV |
1101 | } |
1102 | ||
3ed4351a DV |
1103 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
1104 | { | |
1105 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1106 | int ret = 0; | |
1107 | ||
1108 | assert_spin_locked(&dev->vbl_lock); | |
1109 | ||
1110 | spin_lock(&dev->vblank_time_lock); | |
1111 | ||
1112 | if (!vblank->enabled) { | |
1113 | /* | |
1114 | * Enable vblank irqs under vblank_time_lock protection. | |
1115 | * All vblank count & timestamp updates are held off | |
1116 | * until we are done reinitializing master counter and | |
1117 | * timestamps. Filtercode in drm_handle_vblank() will | |
1118 | * prevent double-accounting of same vblank interval. | |
1119 | */ | |
1120 | ret = __enable_vblank(dev, pipe); | |
02149a76 SR |
1121 | drm_dbg_core(dev, "enabling vblank on crtc %u, ret: %d\n", |
1122 | pipe, ret); | |
3ed4351a DV |
1123 | if (ret) { |
1124 | atomic_dec(&vblank->refcount); | |
1125 | } else { | |
1126 | drm_update_vblank_count(dev, pipe, 0); | |
1127 | /* drm_update_vblank_count() includes a wmb so we just | |
1128 | * need to ensure that the compiler emits the write | |
1129 | * to mark the vblank as enabled after the call | |
1130 | * to drm_update_vblank_count(). | |
1131 | */ | |
1132 | WRITE_ONCE(vblank->enabled, true); | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | spin_unlock(&dev->vblank_time_lock); | |
1137 | ||
1138 | return ret; | |
1139 | } | |
1140 | ||
3ed4351a DV |
1141 | static int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
1142 | { | |
1143 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1144 | unsigned long irqflags; | |
1145 | int ret = 0; | |
1146 | ||
6015002e | 1147 | if (!drm_dev_has_vblank(dev)) |
3ed4351a DV |
1148 | return -EINVAL; |
1149 | ||
5a4784f4 | 1150 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1151 | return -EINVAL; |
1152 | ||
1153 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1154 | /* Going from 0->1 means we have to enable interrupts again */ | |
1155 | if (atomic_add_return(1, &vblank->refcount) == 1) { | |
1156 | ret = drm_vblank_enable(dev, pipe); | |
1157 | } else { | |
1158 | if (!vblank->enabled) { | |
1159 | atomic_dec(&vblank->refcount); | |
1160 | ret = -EINVAL; | |
1161 | } | |
1162 | } | |
1163 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1164 | ||
1165 | return ret; | |
1166 | } | |
1167 | ||
1168 | /** | |
1169 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1170 | * @crtc: which CRTC to own | |
1171 | * | |
1172 | * Acquire a reference count on vblank events to avoid having them disabled | |
1173 | * while in use. | |
1174 | * | |
1175 | * Returns: | |
1176 | * Zero on success or a negative error code on failure. | |
1177 | */ | |
1178 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1179 | { | |
1180 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1181 | } | |
1182 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1183 | ||
3ed4351a DV |
1184 | static void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
1185 | { | |
1186 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1187 | ||
5a4784f4 | 1188 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1189 | return; |
1190 | ||
5a4784f4 | 1191 | if (drm_WARN_ON(dev, atomic_read(&vblank->refcount) == 0)) |
3ed4351a DV |
1192 | return; |
1193 | ||
1194 | /* Last user schedules interrupt disable */ | |
1195 | if (atomic_dec_and_test(&vblank->refcount)) { | |
1196 | if (drm_vblank_offdelay == 0) | |
1197 | return; | |
1198 | else if (drm_vblank_offdelay < 0) | |
e99e88a9 | 1199 | vblank_disable_fn(&vblank->disable_timer); |
3ed4351a DV |
1200 | else if (!dev->vblank_disable_immediate) |
1201 | mod_timer(&vblank->disable_timer, | |
1202 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | /** | |
1207 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1208 | * @crtc: which counter to give up | |
1209 | * | |
1210 | * Release ownership of a given vblank counter, turning off interrupts | |
1211 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1212 | */ | |
1213 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1214 | { | |
1215 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1216 | } | |
1217 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1218 | ||
1219 | /** | |
1220 | * drm_wait_one_vblank - wait for one vblank | |
1221 | * @dev: DRM device | |
1222 | * @pipe: CRTC index | |
1223 | * | |
1224 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. | |
1225 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. | |
1226 | * due to lack of driver support or because the crtc is off. | |
57d30230 DV |
1227 | * |
1228 | * This is the legacy version of drm_crtc_wait_one_vblank(). | |
3ed4351a DV |
1229 | */ |
1230 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) | |
1231 | { | |
1232 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1233 | int ret; | |
3b765c0b | 1234 | u64 last; |
3ed4351a | 1235 | |
5a4784f4 | 1236 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1237 | return; |
1238 | ||
1239 | ret = drm_vblank_get(dev, pipe); | |
5a4784f4 SR |
1240 | if (drm_WARN(dev, ret, "vblank not available on crtc %i, ret=%i\n", |
1241 | pipe, ret)) | |
3ed4351a DV |
1242 | return; |
1243 | ||
1244 | last = drm_vblank_count(dev, pipe); | |
1245 | ||
1246 | ret = wait_event_timeout(vblank->queue, | |
1247 | last != drm_vblank_count(dev, pipe), | |
1248 | msecs_to_jiffies(100)); | |
1249 | ||
5a4784f4 | 1250 | drm_WARN(dev, ret == 0, "vblank wait timed out on crtc %i\n", pipe); |
3ed4351a DV |
1251 | |
1252 | drm_vblank_put(dev, pipe); | |
1253 | } | |
1254 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1255 | ||
1256 | /** | |
1257 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1258 | * @crtc: DRM crtc | |
1259 | * | |
1260 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1261 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1262 | * due to lack of driver support or because the crtc is off. | |
1263 | */ | |
1264 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1265 | { | |
1266 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1267 | } | |
1268 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1269 | ||
1270 | /** | |
1271 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1272 | * @crtc: CRTC in question | |
1273 | * | |
1274 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1275 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1276 | * stored so that drm_vblank_on can restore it again. | |
1277 | * | |
1278 | * Drivers must use this function when the hardware vblank counter can get | |
57d30230 | 1279 | * reset, e.g. when suspending or disabling the @crtc in general. |
3ed4351a DV |
1280 | */ |
1281 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1282 | { | |
1283 | struct drm_device *dev = crtc->dev; | |
1284 | unsigned int pipe = drm_crtc_index(crtc); | |
1285 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1286 | struct drm_pending_vblank_event *e, *t; | |
67680d3c AB |
1287 | |
1288 | ktime_t now; | |
3ed4351a | 1289 | unsigned long irqflags; |
570e8696 | 1290 | u64 seq; |
3ed4351a | 1291 | |
5a4784f4 | 1292 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1293 | return; |
1294 | ||
1295 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1296 | ||
1297 | spin_lock(&dev->vbl_lock); | |
02149a76 SR |
1298 | drm_dbg_vbl(dev, "crtc %d, vblank enabled %d, inmodeset %d\n", |
1299 | pipe, vblank->enabled, vblank->inmodeset); | |
3ed4351a DV |
1300 | |
1301 | /* Avoid redundant vblank disables without previous | |
1302 | * drm_crtc_vblank_on(). */ | |
1303 | if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset) | |
1304 | drm_vblank_disable_and_save(dev, pipe); | |
1305 | ||
1306 | wake_up(&vblank->queue); | |
1307 | ||
1308 | /* | |
1309 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1310 | * the vblank interrupt by bumping the refcount. | |
1311 | */ | |
1312 | if (!vblank->inmodeset) { | |
1313 | atomic_inc(&vblank->refcount); | |
1314 | vblank->inmodeset = 1; | |
1315 | } | |
1316 | spin_unlock(&dev->vbl_lock); | |
1317 | ||
1318 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
1319 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1320 | ||
1321 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1322 | if (e->pipe != pipe) | |
1323 | continue; | |
02149a76 SR |
1324 | drm_dbg_core(dev, "Sending premature vblank event on disable: " |
1325 | "wanted %llu, current %llu\n", | |
1326 | e->sequence, seq); | |
3ed4351a DV |
1327 | list_del(&e->base.link); |
1328 | drm_vblank_put(dev, pipe); | |
67680d3c | 1329 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1330 | } |
1331 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1332 | ||
1333 | /* Will be reset by the modeset helpers when re-enabling the crtc by | |
1334 | * calling drm_calc_timestamping_constants(). */ | |
1335 | vblank->hwmode.crtc_clock = 0; | |
1336 | } | |
1337 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1338 | ||
1339 | /** | |
1340 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
1341 | * @crtc: CRTC in question | |
1342 | * | |
1343 | * Drivers can use this function to reset the vblank state to off at load time. | |
1344 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1345 | * drm_crtc_vblank_on() functions. The difference compared to | |
1346 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1347 | * and hence doesn't need to call any driver hooks. | |
57d30230 DV |
1348 | * |
1349 | * This is useful for recovering driver state e.g. on driver load, or on resume. | |
3ed4351a DV |
1350 | */ |
1351 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) | |
1352 | { | |
1353 | struct drm_device *dev = crtc->dev; | |
1354 | unsigned long irqflags; | |
1355 | unsigned int pipe = drm_crtc_index(crtc); | |
1356 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1357 | ||
1358 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1359 | /* | |
1360 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1361 | * interrupt by bumping the refcount. | |
1362 | */ | |
1363 | if (!vblank->inmodeset) { | |
1364 | atomic_inc(&vblank->refcount); | |
1365 | vblank->inmodeset = 1; | |
1366 | } | |
1367 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1368 | ||
5a4784f4 | 1369 | drm_WARN_ON(dev, !list_empty(&dev->vblank_event_list)); |
3ed4351a DV |
1370 | } |
1371 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1372 | ||
ed20151a VS |
1373 | /** |
1374 | * drm_crtc_set_max_vblank_count - configure the hw max vblank counter value | |
1375 | * @crtc: CRTC in question | |
1376 | * @max_vblank_count: max hardware vblank counter value | |
1377 | * | |
1378 | * Update the maximum hardware vblank counter value for @crtc | |
1379 | * at runtime. Useful for hardware where the operation of the | |
1380 | * hardware vblank counter depends on the currently active | |
1381 | * display configuration. | |
1382 | * | |
1383 | * For example, if the hardware vblank counter does not work | |
1384 | * when a specific connector is active the maximum can be set | |
1385 | * to zero. And when that specific connector isn't active the | |
1386 | * maximum can again be set to the appropriate non-zero value. | |
1387 | * | |
1388 | * If used, must be called before drm_vblank_on(). | |
1389 | */ | |
1390 | void drm_crtc_set_max_vblank_count(struct drm_crtc *crtc, | |
1391 | u32 max_vblank_count) | |
1392 | { | |
1393 | struct drm_device *dev = crtc->dev; | |
1394 | unsigned int pipe = drm_crtc_index(crtc); | |
1395 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1396 | ||
5a4784f4 SR |
1397 | drm_WARN_ON(dev, dev->max_vblank_count); |
1398 | drm_WARN_ON(dev, !READ_ONCE(vblank->inmodeset)); | |
ed20151a VS |
1399 | |
1400 | vblank->max_vblank_count = max_vblank_count; | |
1401 | } | |
1402 | EXPORT_SYMBOL(drm_crtc_set_max_vblank_count); | |
1403 | ||
3ed4351a DV |
1404 | /** |
1405 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1406 | * @crtc: CRTC in question | |
1407 | * | |
1408 | * This functions restores the vblank interrupt state captured with | |
57d30230 DV |
1409 | * drm_crtc_vblank_off() again and is generally called when enabling @crtc. Note |
1410 | * that calls to drm_crtc_vblank_on() and drm_crtc_vblank_off() can be | |
1411 | * unbalanced and so can also be unconditionally called in driver load code to | |
1412 | * reflect the current hardware state of the crtc. | |
3ed4351a DV |
1413 | */ |
1414 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1415 | { | |
1416 | struct drm_device *dev = crtc->dev; | |
1417 | unsigned int pipe = drm_crtc_index(crtc); | |
1418 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1419 | unsigned long irqflags; | |
1420 | ||
5a4784f4 | 1421 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1422 | return; |
1423 | ||
1424 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
02149a76 SR |
1425 | drm_dbg_vbl(dev, "crtc %d, vblank enabled %d, inmodeset %d\n", |
1426 | pipe, vblank->enabled, vblank->inmodeset); | |
3ed4351a DV |
1427 | |
1428 | /* Drop our private "prevent drm_vblank_get" refcount */ | |
1429 | if (vblank->inmodeset) { | |
1430 | atomic_dec(&vblank->refcount); | |
1431 | vblank->inmodeset = 0; | |
1432 | } | |
1433 | ||
1434 | drm_reset_vblank_timestamp(dev, pipe); | |
1435 | ||
1436 | /* | |
1437 | * re-enable interrupts if there are users left, or the | |
1438 | * user wishes vblank interrupts to be enabled all the time. | |
1439 | */ | |
1440 | if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0) | |
5a4784f4 | 1441 | drm_WARN_ON(dev, drm_vblank_enable(dev, pipe)); |
3ed4351a DV |
1442 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1443 | } | |
1444 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1445 | ||
d0bb96b4 | 1446 | /** |
ea3f0ef3 DP |
1447 | * drm_vblank_restore - estimate missed vblanks and update vblank count. |
1448 | * @dev: DRM device | |
1449 | * @pipe: CRTC index | |
d0bb96b4 DP |
1450 | * |
1451 | * Power manamement features can cause frame counter resets between vblank | |
ea3f0ef3 DP |
1452 | * disable and enable. Drivers can use this function in their |
1453 | * &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since | |
1454 | * the last &drm_crtc_funcs.disable_vblank using timestamps and update the | |
1455 | * vblank counter. | |
d0bb96b4 DP |
1456 | * |
1457 | * This function is the legacy version of drm_crtc_vblank_restore(). | |
1458 | */ | |
1459 | void drm_vblank_restore(struct drm_device *dev, unsigned int pipe) | |
1460 | { | |
1461 | ktime_t t_vblank; | |
1462 | struct drm_vblank_crtc *vblank; | |
1463 | int framedur_ns; | |
1464 | u64 diff_ns; | |
1465 | u32 cur_vblank, diff = 1; | |
1466 | int count = DRM_TIMESTAMP_MAXRETRIES; | |
1467 | ||
5a4784f4 | 1468 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
d0bb96b4 DP |
1469 | return; |
1470 | ||
1471 | assert_spin_locked(&dev->vbl_lock); | |
1472 | assert_spin_locked(&dev->vblank_time_lock); | |
1473 | ||
1474 | vblank = &dev->vblank[pipe]; | |
5a4784f4 SR |
1475 | drm_WARN_ONCE(dev, |
1476 | drm_debug_enabled(DRM_UT_VBL) && !vblank->framedur_ns, | |
1477 | "Cannot compute missed vblanks without frame duration\n"); | |
d0bb96b4 DP |
1478 | framedur_ns = vblank->framedur_ns; |
1479 | ||
1480 | do { | |
1481 | cur_vblank = __get_vblank_counter(dev, pipe); | |
1482 | drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false); | |
1483 | } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0); | |
1484 | ||
1485 | diff_ns = ktime_to_ns(ktime_sub(t_vblank, vblank->time)); | |
1486 | if (framedur_ns) | |
1487 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); | |
1488 | ||
1489 | ||
02149a76 SR |
1490 | drm_dbg_vbl(dev, |
1491 | "missed %d vblanks in %lld ns, frame duration=%d ns, hw_diff=%d\n", | |
1492 | diff, diff_ns, framedur_ns, cur_vblank - vblank->last); | |
d0bb96b4 DP |
1493 | store_vblank(dev, pipe, diff, t_vblank, cur_vblank); |
1494 | } | |
1495 | EXPORT_SYMBOL(drm_vblank_restore); | |
1496 | ||
1497 | /** | |
ea3f0ef3 DP |
1498 | * drm_crtc_vblank_restore - estimate missed vblanks and update vblank count. |
1499 | * @crtc: CRTC in question | |
1500 | * | |
d0bb96b4 | 1501 | * Power manamement features can cause frame counter resets between vblank |
ea3f0ef3 DP |
1502 | * disable and enable. Drivers can use this function in their |
1503 | * &drm_crtc_funcs.enable_vblank implementation to estimate missed vblanks since | |
1504 | * the last &drm_crtc_funcs.disable_vblank using timestamps and update the | |
1505 | * vblank counter. | |
d0bb96b4 DP |
1506 | */ |
1507 | void drm_crtc_vblank_restore(struct drm_crtc *crtc) | |
1508 | { | |
1509 | drm_vblank_restore(crtc->dev, drm_crtc_index(crtc)); | |
1510 | } | |
1511 | EXPORT_SYMBOL(drm_crtc_vblank_restore); | |
1512 | ||
3ed4351a DV |
1513 | static void drm_legacy_vblank_pre_modeset(struct drm_device *dev, |
1514 | unsigned int pipe) | |
1515 | { | |
1516 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1517 | ||
1518 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
6015002e | 1519 | if (!drm_dev_has_vblank(dev)) |
3ed4351a DV |
1520 | return; |
1521 | ||
5a4784f4 | 1522 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1523 | return; |
1524 | ||
1525 | /* | |
1526 | * To avoid all the problems that might happen if interrupts | |
1527 | * were enabled/disabled around or between these calls, we just | |
1528 | * have the kernel take a reference on the CRTC (just once though | |
1529 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1530 | * so that interrupts remain enabled in the interim. | |
1531 | */ | |
1532 | if (!vblank->inmodeset) { | |
1533 | vblank->inmodeset = 0x1; | |
1534 | if (drm_vblank_get(dev, pipe) == 0) | |
1535 | vblank->inmodeset |= 0x2; | |
1536 | } | |
1537 | } | |
1538 | ||
1539 | static void drm_legacy_vblank_post_modeset(struct drm_device *dev, | |
1540 | unsigned int pipe) | |
1541 | { | |
1542 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1543 | unsigned long irqflags; | |
1544 | ||
1545 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ | |
6015002e | 1546 | if (!drm_dev_has_vblank(dev)) |
3ed4351a DV |
1547 | return; |
1548 | ||
5a4784f4 | 1549 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1550 | return; |
1551 | ||
1552 | if (vblank->inmodeset) { | |
1553 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1554 | drm_reset_vblank_timestamp(dev, pipe); | |
1555 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1556 | ||
1557 | if (vblank->inmodeset & 0x2) | |
1558 | drm_vblank_put(dev, pipe); | |
1559 | ||
1560 | vblank->inmodeset = 0; | |
1561 | } | |
1562 | } | |
1563 | ||
b6dcaaac DV |
1564 | int drm_legacy_modeset_ctl_ioctl(struct drm_device *dev, void *data, |
1565 | struct drm_file *file_priv) | |
3ed4351a DV |
1566 | { |
1567 | struct drm_modeset_ctl *modeset = data; | |
1568 | unsigned int pipe; | |
1569 | ||
1570 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
6015002e | 1571 | if (!drm_dev_has_vblank(dev)) |
3ed4351a DV |
1572 | return 0; |
1573 | ||
1574 | /* KMS drivers handle this internally */ | |
1575 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) | |
1576 | return 0; | |
1577 | ||
1578 | pipe = modeset->crtc; | |
1579 | if (pipe >= dev->num_crtcs) | |
1580 | return -EINVAL; | |
1581 | ||
1582 | switch (modeset->cmd) { | |
1583 | case _DRM_PRE_MODESET: | |
1584 | drm_legacy_vblank_pre_modeset(dev, pipe); | |
1585 | break; | |
1586 | case _DRM_POST_MODESET: | |
1587 | drm_legacy_vblank_post_modeset(dev, pipe); | |
1588 | break; | |
1589 | default: | |
1590 | return -EINVAL; | |
1591 | } | |
1592 | ||
1593 | return 0; | |
1594 | } | |
1595 | ||
570e8696 | 1596 | static inline bool vblank_passed(u64 seq, u64 ref) |
3ed4351a DV |
1597 | { |
1598 | return (seq - ref) <= (1 << 23); | |
1599 | } | |
1600 | ||
1601 | static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe, | |
570e8696 | 1602 | u64 req_seq, |
3ed4351a DV |
1603 | union drm_wait_vblank *vblwait, |
1604 | struct drm_file *file_priv) | |
1605 | { | |
1606 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1607 | struct drm_pending_vblank_event *e; | |
67680d3c | 1608 | ktime_t now; |
3ed4351a | 1609 | unsigned long flags; |
570e8696 | 1610 | u64 seq; |
3ed4351a DV |
1611 | int ret; |
1612 | ||
1613 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
1614 | if (e == NULL) { | |
1615 | ret = -ENOMEM; | |
1616 | goto err_put; | |
1617 | } | |
1618 | ||
1619 | e->pipe = pipe; | |
1620 | e->event.base.type = DRM_EVENT_VBLANK; | |
bd386e51 KP |
1621 | e->event.base.length = sizeof(e->event.vbl); |
1622 | e->event.vbl.user_data = vblwait->request.signal; | |
1623 | e->event.vbl.crtc_id = 0; | |
1624 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1625 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); | |
948de842 | 1626 | |
bd386e51 KP |
1627 | if (crtc) |
1628 | e->event.vbl.crtc_id = crtc->base.id; | |
1629 | } | |
3ed4351a DV |
1630 | |
1631 | spin_lock_irqsave(&dev->event_lock, flags); | |
1632 | ||
1633 | /* | |
1634 | * drm_crtc_vblank_off() might have been called after we called | |
1635 | * drm_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |
1636 | * vblank disable, so no need for further locking. The reference from | |
1637 | * drm_vblank_get() protects against vblank disable from another source. | |
1638 | */ | |
1639 | if (!READ_ONCE(vblank->enabled)) { | |
1640 | ret = -EINVAL; | |
1641 | goto err_unlock; | |
1642 | } | |
1643 | ||
1644 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |
1645 | &e->event.base); | |
1646 | ||
1647 | if (ret) | |
1648 | goto err_unlock; | |
1649 | ||
1650 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1651 | ||
02149a76 SR |
1652 | drm_dbg_core(dev, "event on vblank count %llu, current %llu, crtc %u\n", |
1653 | req_seq, seq, pipe); | |
3ed4351a | 1654 | |
570e8696 | 1655 | trace_drm_vblank_event_queued(file_priv, pipe, req_seq); |
3ed4351a | 1656 | |
570e8696 KP |
1657 | e->sequence = req_seq; |
1658 | if (vblank_passed(seq, req_seq)) { | |
3ed4351a | 1659 | drm_vblank_put(dev, pipe); |
67680d3c | 1660 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1661 | vblwait->reply.sequence = seq; |
1662 | } else { | |
1663 | /* drm_handle_vblank_events will call drm_vblank_put */ | |
1664 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
570e8696 | 1665 | vblwait->reply.sequence = req_seq; |
3ed4351a DV |
1666 | } |
1667 | ||
1668 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1669 | ||
1670 | return 0; | |
1671 | ||
1672 | err_unlock: | |
1673 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1674 | kfree(e); | |
1675 | err_put: | |
1676 | drm_vblank_put(dev, pipe); | |
1677 | return ret; | |
1678 | } | |
1679 | ||
1680 | static bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait) | |
1681 | { | |
1682 | if (vblwait->request.sequence) | |
1683 | return false; | |
1684 | ||
1685 | return _DRM_VBLANK_RELATIVE == | |
1686 | (vblwait->request.type & (_DRM_VBLANK_TYPES_MASK | | |
1687 | _DRM_VBLANK_EVENT | | |
1688 | _DRM_VBLANK_NEXTONMISS)); | |
1689 | } | |
1690 | ||
570e8696 KP |
1691 | /* |
1692 | * Widen a 32-bit param to 64-bits. | |
1693 | * | |
1694 | * \param narrow 32-bit value (missing upper 32 bits) | |
1695 | * \param near 64-bit value that should be 'close' to near | |
1696 | * | |
1697 | * This function returns a 64-bit value using the lower 32-bits from | |
1698 | * 'narrow' and constructing the upper 32-bits so that the result is | |
1699 | * as close as possible to 'near'. | |
1700 | */ | |
1701 | ||
1702 | static u64 widen_32_to_64(u32 narrow, u64 near) | |
1703 | { | |
1704 | return near + (s32) (narrow - near); | |
1705 | } | |
1706 | ||
67680d3c AB |
1707 | static void drm_wait_vblank_reply(struct drm_device *dev, unsigned int pipe, |
1708 | struct drm_wait_vblank_reply *reply) | |
1709 | { | |
1710 | ktime_t now; | |
1711 | struct timespec64 ts; | |
1712 | ||
1713 | /* | |
1714 | * drm_wait_vblank_reply is a UAPI structure that uses 'long' | |
25e1a798 AB |
1715 | * to store the seconds. This is safe as we always use monotonic |
1716 | * timestamps since linux-4.15. | |
67680d3c AB |
1717 | */ |
1718 | reply->sequence = drm_vblank_count_and_time(dev, pipe, &now); | |
1719 | ts = ktime_to_timespec64(now); | |
1720 | reply->tval_sec = (u32)ts.tv_sec; | |
1721 | reply->tval_usec = ts.tv_nsec / 1000; | |
1722 | } | |
1723 | ||
b6dcaaac DV |
1724 | int drm_wait_vblank_ioctl(struct drm_device *dev, void *data, |
1725 | struct drm_file *file_priv) | |
3ed4351a | 1726 | { |
7de440db | 1727 | struct drm_crtc *crtc; |
3ed4351a DV |
1728 | struct drm_vblank_crtc *vblank; |
1729 | union drm_wait_vblank *vblwait = data; | |
1730 | int ret; | |
570e8696 | 1731 | u64 req_seq, seq; |
7de440db | 1732 | unsigned int pipe_index; |
570e8696 | 1733 | unsigned int flags, pipe, high_pipe; |
3ed4351a DV |
1734 | |
1735 | if (!dev->irq_enabled) | |
aed6105b | 1736 | return -EOPNOTSUPP; |
3ed4351a DV |
1737 | |
1738 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) | |
1739 | return -EINVAL; | |
1740 | ||
1741 | if (vblwait->request.type & | |
1742 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1743 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
02149a76 SR |
1744 | drm_dbg_core(dev, |
1745 | "Unsupported type value 0x%x, supported mask 0x%x\n", | |
1746 | vblwait->request.type, | |
1747 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | | |
1748 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
3ed4351a DV |
1749 | return -EINVAL; |
1750 | } | |
1751 | ||
1752 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; | |
1753 | high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); | |
1754 | if (high_pipe) | |
7de440db | 1755 | pipe_index = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT; |
3ed4351a | 1756 | else |
7de440db KP |
1757 | pipe_index = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
1758 | ||
1759 | /* Convert lease-relative crtc index into global crtc index */ | |
1760 | if (drm_core_check_feature(dev, DRIVER_MODESET)) { | |
1761 | pipe = 0; | |
1762 | drm_for_each_crtc(crtc, dev) { | |
1763 | if (drm_lease_held(file_priv, crtc->base.id)) { | |
1764 | if (pipe_index == 0) | |
1765 | break; | |
1766 | pipe_index--; | |
1767 | } | |
1768 | pipe++; | |
1769 | } | |
1770 | } else { | |
1771 | pipe = pipe_index; | |
1772 | } | |
1773 | ||
3ed4351a DV |
1774 | if (pipe >= dev->num_crtcs) |
1775 | return -EINVAL; | |
1776 | ||
1777 | vblank = &dev->vblank[pipe]; | |
1778 | ||
1779 | /* If the counter is currently enabled and accurate, short-circuit | |
1780 | * queries to return the cached timestamp of the last vblank. | |
1781 | */ | |
1782 | if (dev->vblank_disable_immediate && | |
1783 | drm_wait_vblank_is_query(vblwait) && | |
1784 | READ_ONCE(vblank->enabled)) { | |
67680d3c | 1785 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
3ed4351a DV |
1786 | return 0; |
1787 | } | |
1788 | ||
1789 | ret = drm_vblank_get(dev, pipe); | |
1790 | if (ret) { | |
02149a76 SR |
1791 | drm_dbg_core(dev, |
1792 | "crtc %d failed to acquire vblank counter, %d\n", | |
1793 | pipe, ret); | |
3ed4351a DV |
1794 | return ret; |
1795 | } | |
1796 | seq = drm_vblank_count(dev, pipe); | |
1797 | ||
1798 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { | |
1799 | case _DRM_VBLANK_RELATIVE: | |
570e8696 KP |
1800 | req_seq = seq + vblwait->request.sequence; |
1801 | vblwait->request.sequence = req_seq; | |
3ed4351a | 1802 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; |
570e8696 | 1803 | break; |
3ed4351a | 1804 | case _DRM_VBLANK_ABSOLUTE: |
570e8696 | 1805 | req_seq = widen_32_to_64(vblwait->request.sequence, seq); |
3ed4351a DV |
1806 | break; |
1807 | default: | |
1808 | ret = -EINVAL; | |
1809 | goto done; | |
1810 | } | |
1811 | ||
1812 | if ((flags & _DRM_VBLANK_NEXTONMISS) && | |
570e8696 KP |
1813 | vblank_passed(seq, req_seq)) { |
1814 | req_seq = seq + 1; | |
1815 | vblwait->request.type &= ~_DRM_VBLANK_NEXTONMISS; | |
1816 | vblwait->request.sequence = req_seq; | |
1817 | } | |
3ed4351a DV |
1818 | |
1819 | if (flags & _DRM_VBLANK_EVENT) { | |
1820 | /* must hold on to the vblank ref until the event fires | |
1821 | * drm_vblank_put will be called asynchronously | |
1822 | */ | |
570e8696 | 1823 | return drm_queue_vblank_event(dev, pipe, req_seq, vblwait, file_priv); |
3ed4351a DV |
1824 | } |
1825 | ||
570e8696 | 1826 | if (req_seq != seq) { |
05103ea9 SR |
1827 | int wait; |
1828 | ||
02149a76 SR |
1829 | drm_dbg_core(dev, "waiting on vblank count %llu, crtc %u\n", |
1830 | req_seq, pipe); | |
05103ea9 SR |
1831 | wait = wait_event_interruptible_timeout(vblank->queue, |
1832 | vblank_passed(drm_vblank_count(dev, pipe), req_seq) || | |
1833 | !READ_ONCE(vblank->enabled), | |
1834 | msecs_to_jiffies(3000)); | |
1835 | ||
1836 | switch (wait) { | |
1837 | case 0: | |
1838 | /* timeout */ | |
1839 | ret = -EBUSY; | |
1840 | break; | |
1841 | case -ERESTARTSYS: | |
1842 | /* interrupted by signal */ | |
1843 | ret = -EINTR; | |
1844 | break; | |
1845 | default: | |
1846 | ret = 0; | |
1847 | break; | |
1848 | } | |
3ed4351a DV |
1849 | } |
1850 | ||
1851 | if (ret != -EINTR) { | |
67680d3c | 1852 | drm_wait_vblank_reply(dev, pipe, &vblwait->reply); |
3ed4351a | 1853 | |
02149a76 SR |
1854 | drm_dbg_core(dev, "crtc %d returning %u to client\n", |
1855 | pipe, vblwait->reply.sequence); | |
3ed4351a | 1856 | } else { |
02149a76 SR |
1857 | drm_dbg_core(dev, "crtc %d vblank wait interrupted by signal\n", |
1858 | pipe); | |
3ed4351a DV |
1859 | } |
1860 | ||
1861 | done: | |
1862 | drm_vblank_put(dev, pipe); | |
1863 | return ret; | |
1864 | } | |
1865 | ||
1866 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) | |
1867 | { | |
7fe3f0d1 TZ |
1868 | struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe); |
1869 | bool high_prec = false; | |
3ed4351a | 1870 | struct drm_pending_vblank_event *e, *t; |
67680d3c | 1871 | ktime_t now; |
570e8696 | 1872 | u64 seq; |
3ed4351a DV |
1873 | |
1874 | assert_spin_locked(&dev->event_lock); | |
1875 | ||
1876 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
1877 | ||
1878 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1879 | if (e->pipe != pipe) | |
1880 | continue; | |
570e8696 | 1881 | if (!vblank_passed(seq, e->sequence)) |
3ed4351a DV |
1882 | continue; |
1883 | ||
02149a76 SR |
1884 | drm_dbg_core(dev, "vblank event on %llu, current %llu\n", |
1885 | e->sequence, seq); | |
3ed4351a DV |
1886 | |
1887 | list_del(&e->base.link); | |
1888 | drm_vblank_put(dev, pipe); | |
67680d3c | 1889 | send_vblank_event(dev, e, seq, now); |
3ed4351a DV |
1890 | } |
1891 | ||
7fe3f0d1 TZ |
1892 | if (crtc && crtc->funcs->get_vblank_timestamp) |
1893 | high_prec = true; | |
7fe3f0d1 TZ |
1894 | |
1895 | trace_drm_vblank_event(pipe, seq, now, high_prec); | |
3ed4351a DV |
1896 | } |
1897 | ||
1898 | /** | |
1899 | * drm_handle_vblank - handle a vblank event | |
1900 | * @dev: DRM device | |
1901 | * @pipe: index of CRTC where this event occurred | |
1902 | * | |
1903 | * Drivers should call this routine in their vblank interrupt handlers to | |
1904 | * update the vblank counter and send any signals that may be pending. | |
1905 | * | |
1906 | * This is the legacy version of drm_crtc_handle_vblank(). | |
1907 | */ | |
1908 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) | |
1909 | { | |
1910 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; | |
1911 | unsigned long irqflags; | |
1912 | bool disable_irq; | |
1913 | ||
5a4784f4 | 1914 | if (drm_WARN_ON_ONCE(dev, !drm_dev_has_vblank(dev))) |
3ed4351a DV |
1915 | return false; |
1916 | ||
5a4784f4 | 1917 | if (drm_WARN_ON(dev, pipe >= dev->num_crtcs)) |
3ed4351a DV |
1918 | return false; |
1919 | ||
1920 | spin_lock_irqsave(&dev->event_lock, irqflags); | |
1921 | ||
1922 | /* Need timestamp lock to prevent concurrent execution with | |
1923 | * vblank enable/disable, as this would cause inconsistent | |
1924 | * or corrupted timestamps and vblank counts. | |
1925 | */ | |
1926 | spin_lock(&dev->vblank_time_lock); | |
1927 | ||
1928 | /* Vblank irq handling disabled. Nothing to do. */ | |
1929 | if (!vblank->enabled) { | |
1930 | spin_unlock(&dev->vblank_time_lock); | |
1931 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1932 | return false; | |
1933 | } | |
1934 | ||
1935 | drm_update_vblank_count(dev, pipe, true); | |
1936 | ||
1937 | spin_unlock(&dev->vblank_time_lock); | |
1938 | ||
1939 | wake_up(&vblank->queue); | |
1940 | ||
1941 | /* With instant-off, we defer disabling the interrupt until after | |
1942 | * we finish processing the following vblank after all events have | |
1943 | * been signaled. The disable has to be last (after | |
1944 | * drm_handle_vblank_events) so that the timestamp is always accurate. | |
1945 | */ | |
1946 | disable_irq = (dev->vblank_disable_immediate && | |
1947 | drm_vblank_offdelay > 0 && | |
1948 | !atomic_read(&vblank->refcount)); | |
1949 | ||
1950 | drm_handle_vblank_events(dev, pipe); | |
1951 | ||
1952 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
1953 | ||
1954 | if (disable_irq) | |
e99e88a9 | 1955 | vblank_disable_fn(&vblank->disable_timer); |
3ed4351a DV |
1956 | |
1957 | return true; | |
1958 | } | |
1959 | EXPORT_SYMBOL(drm_handle_vblank); | |
1960 | ||
1961 | /** | |
1962 | * drm_crtc_handle_vblank - handle a vblank event | |
1963 | * @crtc: where this event occurred | |
1964 | * | |
1965 | * Drivers should call this routine in their vblank interrupt handlers to | |
1966 | * update the vblank counter and send any signals that may be pending. | |
1967 | * | |
1968 | * This is the native KMS version of drm_handle_vblank(). | |
1969 | * | |
bd7e3f3b DV |
1970 | * Note that for a given vblank counter value drm_crtc_handle_vblank() |
1971 | * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time() | |
1972 | * provide a barrier: Any writes done before calling | |
1973 | * drm_crtc_handle_vblank() will be visible to callers of the later | |
1974 | * functions, iff the vblank count is the same or a later one. | |
1975 | * | |
1976 | * See also &drm_vblank_crtc.count. | |
1977 | * | |
3ed4351a DV |
1978 | * Returns: |
1979 | * True if the event was successfully handled, false on failure. | |
1980 | */ | |
1981 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1982 | { | |
1983 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1984 | } | |
1985 | EXPORT_SYMBOL(drm_crtc_handle_vblank); | |
3064abfa KP |
1986 | |
1987 | /* | |
1988 | * Get crtc VBLANK count. | |
1989 | * | |
1990 | * \param dev DRM device | |
1991 | * \param data user arguement, pointing to a drm_crtc_get_sequence structure. | |
1992 | * \param file_priv drm file private for the user's open file descriptor | |
1993 | */ | |
1994 | ||
1995 | int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data, | |
1996 | struct drm_file *file_priv) | |
1997 | { | |
1998 | struct drm_crtc *crtc; | |
1999 | struct drm_vblank_crtc *vblank; | |
2000 | int pipe; | |
2001 | struct drm_crtc_get_sequence *get_seq = data; | |
2002 | ktime_t now; | |
2003 | bool vblank_enabled; | |
2004 | int ret; | |
2005 | ||
2006 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
69fdf420 | 2007 | return -EOPNOTSUPP; |
3064abfa KP |
2008 | |
2009 | if (!dev->irq_enabled) | |
aed6105b | 2010 | return -EOPNOTSUPP; |
3064abfa KP |
2011 | |
2012 | crtc = drm_crtc_find(dev, file_priv, get_seq->crtc_id); | |
2013 | if (!crtc) | |
2014 | return -ENOENT; | |
2015 | ||
2016 | pipe = drm_crtc_index(crtc); | |
2017 | ||
2018 | vblank = &dev->vblank[pipe]; | |
2019 | vblank_enabled = dev->vblank_disable_immediate && READ_ONCE(vblank->enabled); | |
2020 | ||
2021 | if (!vblank_enabled) { | |
2022 | ret = drm_crtc_vblank_get(crtc); | |
2023 | if (ret) { | |
02149a76 SR |
2024 | drm_dbg_core(dev, |
2025 | "crtc %d failed to acquire vblank counter, %d\n", | |
2026 | pipe, ret); | |
3064abfa KP |
2027 | return ret; |
2028 | } | |
2029 | } | |
2030 | drm_modeset_lock(&crtc->mutex, NULL); | |
2031 | if (crtc->state) | |
2032 | get_seq->active = crtc->state->enable; | |
2033 | else | |
2034 | get_seq->active = crtc->enabled; | |
2035 | drm_modeset_unlock(&crtc->mutex); | |
2036 | get_seq->sequence = drm_vblank_count_and_time(dev, pipe, &now); | |
2037 | get_seq->sequence_ns = ktime_to_ns(now); | |
2038 | if (!vblank_enabled) | |
2039 | drm_crtc_vblank_put(crtc); | |
2040 | return 0; | |
2041 | } | |
2042 | ||
2043 | /* | |
2044 | * Queue a event for VBLANK sequence | |
2045 | * | |
2046 | * \param dev DRM device | |
2047 | * \param data user arguement, pointing to a drm_crtc_queue_sequence structure. | |
2048 | * \param file_priv drm file private for the user's open file descriptor | |
2049 | */ | |
2050 | ||
2051 | int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data, | |
2052 | struct drm_file *file_priv) | |
2053 | { | |
2054 | struct drm_crtc *crtc; | |
2055 | struct drm_vblank_crtc *vblank; | |
2056 | int pipe; | |
2057 | struct drm_crtc_queue_sequence *queue_seq = data; | |
2058 | ktime_t now; | |
2059 | struct drm_pending_vblank_event *e; | |
2060 | u32 flags; | |
2061 | u64 seq; | |
2062 | u64 req_seq; | |
2063 | int ret; | |
2064 | unsigned long spin_flags; | |
2065 | ||
2066 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
69fdf420 | 2067 | return -EOPNOTSUPP; |
3064abfa KP |
2068 | |
2069 | if (!dev->irq_enabled) | |
aed6105b | 2070 | return -EOPNOTSUPP; |
3064abfa KP |
2071 | |
2072 | crtc = drm_crtc_find(dev, file_priv, queue_seq->crtc_id); | |
2073 | if (!crtc) | |
2074 | return -ENOENT; | |
2075 | ||
2076 | flags = queue_seq->flags; | |
2077 | /* Check valid flag bits */ | |
2078 | if (flags & ~(DRM_CRTC_SEQUENCE_RELATIVE| | |
2079 | DRM_CRTC_SEQUENCE_NEXT_ON_MISS)) | |
2080 | return -EINVAL; | |
2081 | ||
2082 | pipe = drm_crtc_index(crtc); | |
2083 | ||
2084 | vblank = &dev->vblank[pipe]; | |
2085 | ||
2086 | e = kzalloc(sizeof(*e), GFP_KERNEL); | |
2087 | if (e == NULL) | |
2088 | return -ENOMEM; | |
2089 | ||
2090 | ret = drm_crtc_vblank_get(crtc); | |
2091 | if (ret) { | |
02149a76 SR |
2092 | drm_dbg_core(dev, |
2093 | "crtc %d failed to acquire vblank counter, %d\n", | |
2094 | pipe, ret); | |
3064abfa KP |
2095 | goto err_free; |
2096 | } | |
2097 | ||
2098 | seq = drm_vblank_count_and_time(dev, pipe, &now); | |
2099 | req_seq = queue_seq->sequence; | |
2100 | ||
2101 | if (flags & DRM_CRTC_SEQUENCE_RELATIVE) | |
2102 | req_seq += seq; | |
2103 | ||
2104 | if ((flags & DRM_CRTC_SEQUENCE_NEXT_ON_MISS) && vblank_passed(seq, req_seq)) | |
2105 | req_seq = seq + 1; | |
2106 | ||
2107 | e->pipe = pipe; | |
2108 | e->event.base.type = DRM_EVENT_CRTC_SEQUENCE; | |
2109 | e->event.base.length = sizeof(e->event.seq); | |
2110 | e->event.seq.user_data = queue_seq->user_data; | |
2111 | ||
2112 | spin_lock_irqsave(&dev->event_lock, spin_flags); | |
2113 | ||
2114 | /* | |
2115 | * drm_crtc_vblank_off() might have been called after we called | |
2116 | * drm_crtc_vblank_get(). drm_crtc_vblank_off() holds event_lock around the | |
2117 | * vblank disable, so no need for further locking. The reference from | |
2118 | * drm_crtc_vblank_get() protects against vblank disable from another source. | |
2119 | */ | |
2120 | if (!READ_ONCE(vblank->enabled)) { | |
2121 | ret = -EINVAL; | |
2122 | goto err_unlock; | |
2123 | } | |
2124 | ||
2125 | ret = drm_event_reserve_init_locked(dev, file_priv, &e->base, | |
2126 | &e->event.base); | |
2127 | ||
2128 | if (ret) | |
2129 | goto err_unlock; | |
2130 | ||
2131 | e->sequence = req_seq; | |
2132 | ||
2133 | if (vblank_passed(seq, req_seq)) { | |
2134 | drm_crtc_vblank_put(crtc); | |
2135 | send_vblank_event(dev, e, seq, now); | |
2136 | queue_seq->sequence = seq; | |
2137 | } else { | |
2138 | /* drm_handle_vblank_events will call drm_vblank_put */ | |
2139 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
2140 | queue_seq->sequence = req_seq; | |
2141 | } | |
2142 | ||
2143 | spin_unlock_irqrestore(&dev->event_lock, spin_flags); | |
2144 | return 0; | |
2145 | ||
2146 | err_unlock: | |
2147 | spin_unlock_irqrestore(&dev->event_lock, spin_flags); | |
2148 | drm_crtc_vblank_put(crtc); | |
2149 | err_free: | |
2150 | kfree(e); | |
2151 | return ret; | |
2152 | } |