Commit | Line | Data |
---|---|---|
f5752b38 DV |
1 | /* |
2 | * drm_irq.c IRQ and vblank support | |
1da177e4 LT |
3 | * |
4 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
5 | * \author Gareth Hughes <gareth@valinux.com> | |
6 | */ | |
7 | ||
8 | /* | |
9 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com | |
10 | * | |
11 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
12 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
13 | * All Rights Reserved. | |
14 | * | |
15 | * Permission is hereby granted, free of charge, to any person obtaining a | |
16 | * copy of this software and associated documentation files (the "Software"), | |
17 | * to deal in the Software without restriction, including without limitation | |
18 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
19 | * and/or sell copies of the Software, and to permit persons to whom the | |
20 | * Software is furnished to do so, subject to the following conditions: | |
21 | * | |
22 | * The above copyright notice and this permission notice (including the next | |
23 | * paragraph) shall be included in all copies or substantial portions of the | |
24 | * Software. | |
25 | * | |
26 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
27 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
28 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
29 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
30 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
31 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
32 | * OTHER DEALINGS IN THE SOFTWARE. | |
33 | */ | |
34 | ||
760285e7 | 35 | #include <drm/drmP.h> |
ac2874b9 | 36 | #include "drm_trace.h" |
18882995 | 37 | #include "drm_internal.h" |
1da177e4 LT |
38 | |
39 | #include <linux/interrupt.h> /* For task queue support */ | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 | 41 | |
28d52043 | 42 | #include <linux/vgaarb.h> |
2d1a8a48 | 43 | #include <linux/export.h> |
27641c3f MK |
44 | |
45 | /* Access macro for slots in vblank timestamp ringbuffer. */ | |
5380e929 VS |
46 | #define vblanktimestamp(dev, crtc, count) \ |
47 | ((dev)->vblank[crtc].time[(count) % DRM_VBLANKTIME_RBSIZE]) | |
27641c3f MK |
48 | |
49 | /* Retry timestamp calculation up to 3 times to satisfy | |
50 | * drm_timestamp_precision before giving up. | |
51 | */ | |
52 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
53 | ||
54 | /* Threshold in nanoseconds for detection of redundant | |
55 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
56 | */ | |
57 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
58 | ||
fb446a1a DV |
59 | static bool |
60 | drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
61 | struct timeval *tvblank, unsigned flags); | |
62 | ||
18882995 DV |
63 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ |
64 | ||
65 | /* | |
66 | * Default to use monotonic timestamps for wait-for-vblank and page-flip | |
67 | * complete events. | |
68 | */ | |
69 | unsigned int drm_timestamp_monotonic = 1; | |
70 | ||
71 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ | |
72 | ||
73 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
74 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
75 | module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600); | |
76 | ||
99264a61 DV |
77 | static void store_vblank(struct drm_device *dev, int crtc, |
78 | unsigned vblank_count_inc, | |
79 | struct timeval *t_vblank) | |
80 | { | |
81 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; | |
82 | u32 tslot; | |
83 | ||
84 | assert_spin_locked(&dev->vblank_time_lock); | |
85 | ||
86 | if (t_vblank) { | |
87 | /* All writers hold the spinlock, but readers are serialized by | |
88 | * the latching of vblank->count below. | |
89 | */ | |
90 | tslot = vblank->count + vblank_count_inc; | |
91 | vblanktimestamp(dev, crtc, tslot) = *t_vblank; | |
92 | } | |
93 | ||
94 | /* | |
95 | * vblank timestamp updates are protected on the write side with | |
96 | * vblank_time_lock, but on the read side done locklessly using a | |
97 | * sequence-lock on the vblank counter. Ensure correct ordering using | |
98 | * memory barrriers. We need the barrier both before and also after the | |
99 | * counter update to synchronize with the next timestamp write. | |
100 | * The read-side barriers for this are in drm_vblank_count_and_time. | |
101 | */ | |
102 | smp_wmb(); | |
103 | vblank->count += vblank_count_inc; | |
104 | smp_wmb(); | |
105 | } | |
106 | ||
13b030af VS |
107 | /** |
108 | * drm_update_vblank_count - update the master vblank counter | |
109 | * @dev: DRM device | |
110 | * @crtc: counter to update | |
111 | * | |
112 | * Call back into the driver to update the appropriate vblank counter | |
113 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
114 | * update the last read value so we can deal with wraparound on the next | |
115 | * call if necessary. | |
116 | * | |
117 | * Only necessary when going from off->on, to account for frames we | |
118 | * didn't get an interrupt for. | |
119 | * | |
120 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
121 | * device vblank fields. | |
122 | */ | |
123 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
124 | { | |
8a51d5be | 125 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
99264a61 | 126 | u32 cur_vblank, diff; |
fb446a1a | 127 | bool rc; |
13b030af VS |
128 | struct timeval t_vblank; |
129 | ||
130 | /* | |
131 | * Interrupts were disabled prior to this call, so deal with counter | |
132 | * wrap if needed. | |
133 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
134 | * here if the register is small or we had vblank interrupts off for | |
135 | * a long time. | |
136 | * | |
137 | * We repeat the hardware vblank counter & timestamp query until | |
138 | * we get consistent results. This to prevent races between gpu | |
139 | * updating its hardware counter while we are retrieving the | |
140 | * corresponding vblank timestamp. | |
141 | */ | |
142 | do { | |
143 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
144 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
145 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
146 | ||
147 | /* Deal with counter wrap */ | |
8a51d5be VS |
148 | diff = cur_vblank - vblank->last; |
149 | if (cur_vblank < vblank->last) { | |
13b030af VS |
150 | diff += dev->max_vblank_count; |
151 | ||
152 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
8a51d5be | 153 | crtc, vblank->last, cur_vblank, diff); |
13b030af VS |
154 | } |
155 | ||
96a9fdd7 | 156 | DRM_DEBUG("updating vblank count on crtc %d, missed %d\n", |
13b030af VS |
157 | crtc, diff); |
158 | ||
da8f4396 MK |
159 | if (diff == 0) |
160 | return; | |
161 | ||
99264a61 DV |
162 | /* |
163 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
d66a1e38 MK |
164 | * available and didn't fail. Otherwise reinitialize delayed at next vblank |
165 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. | |
13b030af | 166 | */ |
d66a1e38 MK |
167 | if (!rc) |
168 | t_vblank = (struct timeval) {0, 0}; | |
169 | ||
170 | store_vblank(dev, crtc, diff, &t_vblank); | |
13b030af VS |
171 | } |
172 | ||
27641c3f MK |
173 | /* |
174 | * Disable vblank irq's on crtc, make sure that last vblank count | |
175 | * of hardware and corresponding consistent software vblank counter | |
176 | * are preserved, even if there are any spurious vblank irq's after | |
177 | * disable. | |
178 | */ | |
179 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
180 | { | |
8a51d5be | 181 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
182 | unsigned long irqflags; |
183 | u32 vblcount; | |
184 | s64 diff_ns; | |
fb446a1a | 185 | bool vblrc; |
27641c3f | 186 | struct timeval tvblank; |
0355cf3a | 187 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
188 | |
189 | /* Prevent vblank irq processing while disabling vblank irqs, | |
190 | * so no updates of timestamps or count can happen after we've | |
191 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 192 | */ |
27641c3f MK |
193 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
194 | ||
812e7465 | 195 | /* |
393e872e | 196 | * If the vblank interrupt was already disabled update the count |
812e7465 VS |
197 | * and timestamp to maintain the appearance that the counter |
198 | * has been ticking all along until this time. This makes the | |
199 | * count account for the entire time between drm_vblank_on() and | |
200 | * drm_vblank_off(). | |
855d30b4 DV |
201 | * |
202 | * But only do this if precise vblank timestamps are available. | |
203 | * Otherwise we might read a totally bogus timestamp since drivers | |
204 | * lacking precise timestamp support rely upon sampling the system clock | |
205 | * at vblank interrupt time. Which obviously won't work out well if the | |
206 | * vblank interrupt is disabled. | |
812e7465 | 207 | */ |
855d30b4 | 208 | if (!vblank->enabled && |
fb446a1a | 209 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0)) { |
812e7465 VS |
210 | drm_update_vblank_count(dev, crtc); |
211 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
212 | return; | |
213 | } | |
214 | ||
eb2ed66f LP |
215 | /* |
216 | * Only disable vblank interrupts if they're enabled. This avoids | |
217 | * calling the ->disable_vblank() operation in atomic context with the | |
218 | * hardware potentially runtime suspended. | |
219 | */ | |
220 | if (vblank->enabled) { | |
221 | dev->driver->disable_vblank(dev, crtc); | |
222 | vblank->enabled = false; | |
223 | } | |
27641c3f MK |
224 | |
225 | /* No further vblank irq's will be processed after | |
226 | * this point. Get current hardware vblank count and | |
227 | * vblank timestamp, repeat until they are consistent. | |
228 | * | |
229 | * FIXME: There is still a race condition here and in | |
230 | * drm_update_vblank_count() which can cause off-by-one | |
231 | * reinitialization of software vblank counter. If gpu | |
232 | * vblank counter doesn't increment exactly at the leading | |
233 | * edge of a vblank interval, then we can lose 1 count if | |
234 | * we happen to execute between start of vblank and the | |
235 | * delayed gpu counter increment. | |
236 | */ | |
237 | do { | |
8a51d5be | 238 | vblank->last = dev->driver->get_vblank_counter(dev, crtc); |
27641c3f | 239 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); |
8a51d5be | 240 | } while (vblank->last != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc); |
0355cf3a EE |
241 | |
242 | if (!count) | |
243 | vblrc = 0; | |
27641c3f MK |
244 | |
245 | /* Compute time difference to stored timestamp of last vblank | |
246 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
247 | */ | |
99264a61 | 248 | vblcount = vblank->count; |
27641c3f MK |
249 | diff_ns = timeval_to_ns(&tvblank) - |
250 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
251 | ||
252 | /* If there is at least 1 msec difference between the last stored | |
253 | * timestamp and tvblank, then we are currently executing our | |
254 | * disable inside a new vblank interval, the tvblank timestamp | |
255 | * corresponds to this new vblank interval and the irq handler | |
256 | * for this vblank didn't run yet and won't run due to our disable. | |
257 | * Therefore we need to do the job of drm_handle_vblank() and | |
258 | * increment the vblank counter by one to account for this vblank. | |
259 | * | |
260 | * Skip this step if there isn't any high precision timestamp | |
261 | * available. In that case we can't account for this and just | |
262 | * hope for the best. | |
263 | */ | |
99264a61 DV |
264 | if (vblrc && (abs64(diff_ns) > 1000000)) |
265 | store_vblank(dev, crtc, 1, &tvblank); | |
27641c3f | 266 | |
27641c3f | 267 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
268 | } |
269 | ||
0a3e67a4 JB |
270 | static void vblank_disable_fn(unsigned long arg) |
271 | { | |
e69595c2 VS |
272 | struct drm_vblank_crtc *vblank = (void *)arg; |
273 | struct drm_device *dev = vblank->dev; | |
0a3e67a4 | 274 | unsigned long irqflags; |
e69595c2 | 275 | int crtc = vblank->crtc; |
0a3e67a4 JB |
276 | |
277 | if (!dev->vblank_disable_allowed) | |
278 | return; | |
279 | ||
e69595c2 VS |
280 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
281 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
282 | DRM_DEBUG("disabling vblank on crtc %d\n", crtc); | |
283 | vblank_disable_and_save(dev, crtc); | |
0a3e67a4 | 284 | } |
e69595c2 | 285 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
286 | } |
287 | ||
f5752b38 DV |
288 | /** |
289 | * drm_vblank_cleanup - cleanup vblank support | |
290 | * @dev: DRM device | |
291 | * | |
292 | * This function cleans up any resources allocated in drm_vblank_init. | |
293 | */ | |
52440211 | 294 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 295 | { |
e69595c2 VS |
296 | int crtc; |
297 | ||
0a3e67a4 JB |
298 | /* Bail if the driver didn't call drm_vblank_init() */ |
299 | if (dev->num_crtcs == 0) | |
300 | return; | |
301 | ||
e69595c2 | 302 | for (crtc = 0; crtc < dev->num_crtcs; crtc++) { |
8a51d5be VS |
303 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
304 | ||
3bff93d6 DV |
305 | WARN_ON(vblank->enabled && |
306 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
2368ffb1 | 307 | |
3bff93d6 | 308 | del_timer_sync(&vblank->disable_timer); |
e69595c2 | 309 | } |
0a3e67a4 | 310 | |
5380e929 | 311 | kfree(dev->vblank); |
0a3e67a4 JB |
312 | |
313 | dev->num_crtcs = 0; | |
314 | } | |
e77cef9c | 315 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 316 | |
f5752b38 DV |
317 | /** |
318 | * drm_vblank_init - initialize vblank support | |
319 | * @dev: drm_device | |
320 | * @num_crtcs: number of crtcs supported by @dev | |
321 | * | |
322 | * This function initializes vblank support for @num_crtcs display pipelines. | |
323 | * | |
324 | * Returns: | |
325 | * Zero on success or a negative error code on failure. | |
326 | */ | |
0a3e67a4 JB |
327 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) |
328 | { | |
329 | int i, ret = -ENOMEM; | |
330 | ||
0a3e67a4 | 331 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
332 | spin_lock_init(&dev->vblank_time_lock); |
333 | ||
0a3e67a4 JB |
334 | dev->num_crtcs = num_crtcs; |
335 | ||
5380e929 VS |
336 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
337 | if (!dev->vblank) | |
0a3e67a4 JB |
338 | goto err; |
339 | ||
e69595c2 | 340 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
341 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
342 | ||
343 | vblank->dev = dev; | |
344 | vblank->crtc = i; | |
345 | init_waitqueue_head(&vblank->queue); | |
346 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
347 | (unsigned long)vblank); | |
e69595c2 | 348 | } |
27641c3f | 349 | |
8f6fce03 | 350 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
351 | |
352 | /* Driver specific high-precision vblank timestamping supported? */ | |
353 | if (dev->driver->get_vblank_timestamp) | |
354 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
355 | else | |
356 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
357 | ||
5a8b21b2 MK |
358 | /* Must have precise timestamping for reliable vblank instant disable */ |
359 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
360 | dev->vblank_disable_immediate = false; | |
361 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
362 | "get_vblank_timestamp == NULL\n"); | |
363 | } | |
364 | ||
ba0bf120 VS |
365 | dev->vblank_disable_allowed = false; |
366 | ||
0a3e67a4 JB |
367 | return 0; |
368 | ||
369 | err: | |
79a093ae | 370 | dev->num_crtcs = 0; |
0a3e67a4 JB |
371 | return ret; |
372 | } | |
373 | EXPORT_SYMBOL(drm_vblank_init); | |
374 | ||
28d52043 DA |
375 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
376 | { | |
377 | struct drm_device *dev = cookie; | |
378 | ||
379 | if (dev->driver->vgaarb_irq) { | |
380 | dev->driver->vgaarb_irq(dev, state); | |
381 | return; | |
382 | } | |
383 | ||
384 | if (!dev->irq_enabled) | |
385 | return; | |
386 | ||
5037f8ac JS |
387 | if (state) { |
388 | if (dev->driver->irq_uninstall) | |
389 | dev->driver->irq_uninstall(dev); | |
390 | } else { | |
391 | if (dev->driver->irq_preinstall) | |
392 | dev->driver->irq_preinstall(dev); | |
393 | if (dev->driver->irq_postinstall) | |
394 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
395 | } |
396 | } | |
397 | ||
1da177e4 | 398 | /** |
f5752b38 DV |
399 | * drm_irq_install - install IRQ handler |
400 | * @dev: DRM device | |
401 | * @irq: IRQ number to install the handler for | |
1da177e4 | 402 | * |
0a3e67a4 | 403 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
404 | * irq_preinstall() and irq_postinstall() functions before and after the |
405 | * installation. | |
406 | * | |
407 | * This is the simplified helper interface provided for drivers with no special | |
408 | * needs. Drivers which need to install interrupt handlers for multiple | |
409 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
410 | * that vblank interrupts are available. | |
411 | * | |
412 | * Returns: | |
413 | * Zero on success or a negative error code on failure. | |
1da177e4 | 414 | */ |
bb0f1b5c | 415 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 416 | { |
4a1b0714 | 417 | int ret; |
b5e89ed5 | 418 | unsigned long sh_flags = 0; |
1da177e4 LT |
419 | |
420 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
421 | return -EINVAL; | |
422 | ||
7c1a38e3 | 423 | if (irq == 0) |
1da177e4 LT |
424 | return -EINVAL; |
425 | ||
1da177e4 | 426 | /* Driver must have been initialized */ |
e090c53b | 427 | if (!dev->dev_private) |
1da177e4 | 428 | return -EINVAL; |
1da177e4 | 429 | |
e090c53b | 430 | if (dev->irq_enabled) |
1da177e4 | 431 | return -EBUSY; |
4423843c | 432 | dev->irq_enabled = true; |
1da177e4 | 433 | |
7c1a38e3 | 434 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 435 | |
b5e89ed5 | 436 | /* Before installing handler */ |
5037f8ac JS |
437 | if (dev->driver->irq_preinstall) |
438 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 439 | |
b5e89ed5 | 440 | /* Install handler */ |
1da177e4 | 441 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 442 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 443 | |
7c1a38e3 | 444 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 445 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 446 | |
b5e89ed5 | 447 | if (ret < 0) { |
4423843c | 448 | dev->irq_enabled = false; |
1da177e4 LT |
449 | return ret; |
450 | } | |
451 | ||
28d52043 DA |
452 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
453 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
454 | ||
b5e89ed5 | 455 | /* After installing handler */ |
5037f8ac JS |
456 | if (dev->driver->irq_postinstall) |
457 | ret = dev->driver->irq_postinstall(dev); | |
458 | ||
0a3e67a4 | 459 | if (ret < 0) { |
4423843c | 460 | dev->irq_enabled = false; |
e1c44acc JS |
461 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
462 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
7c1a38e3 DV |
463 | free_irq(irq, dev); |
464 | } else { | |
465 | dev->irq = irq; | |
0a3e67a4 | 466 | } |
1da177e4 | 467 | |
0a3e67a4 | 468 | return ret; |
1da177e4 | 469 | } |
0a3e67a4 | 470 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
471 | |
472 | /** | |
f5752b38 DV |
473 | * drm_irq_uninstall - uninstall the IRQ handler |
474 | * @dev: DRM device | |
475 | * | |
476 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
477 | * This should only be called by drivers which used drm_irq_install() to set up | |
478 | * their interrupt handler. Other drivers must only reset | |
479 | * drm_device->irq_enabled to false. | |
1da177e4 | 480 | * |
f5752b38 DV |
481 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
482 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
483 | * the same function through an ioctl. | |
1da177e4 | 484 | * |
f5752b38 DV |
485 | * Returns: |
486 | * Zero on success or a negative error code on failure. | |
1da177e4 | 487 | */ |
27641c3f | 488 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 489 | { |
dc1336ff | 490 | unsigned long irqflags; |
4423843c VS |
491 | bool irq_enabled; |
492 | int i; | |
1da177e4 LT |
493 | |
494 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
495 | return -EINVAL; | |
496 | ||
1da177e4 | 497 | irq_enabled = dev->irq_enabled; |
4423843c | 498 | dev->irq_enabled = false; |
1da177e4 | 499 | |
dc1336ff | 500 | /* |
3bff93d6 DV |
501 | * Wake up any waiters so they don't hang. This is just to paper over |
502 | * isssues for UMS drivers which aren't in full control of their | |
503 | * vblank/irq handling. KMS drivers must ensure that vblanks are all | |
504 | * disabled when uninstalling the irq handler. | |
dc1336ff | 505 | */ |
bde4889a BS |
506 | if (dev->num_crtcs) { |
507 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
508 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
509 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
510 | ||
3bff93d6 DV |
511 | if (!vblank->enabled) |
512 | continue; | |
513 | ||
514 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
515 | ||
516 | vblank_disable_and_save(dev, i); | |
8a51d5be | 517 | wake_up(&vblank->queue); |
bde4889a BS |
518 | } |
519 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 520 | } |
dc1336ff | 521 | |
b5e89ed5 | 522 | if (!irq_enabled) |
1da177e4 LT |
523 | return -EINVAL; |
524 | ||
7c1a38e3 | 525 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 526 | |
28d52043 DA |
527 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
528 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
529 | ||
5037f8ac JS |
530 | if (dev->driver->irq_uninstall) |
531 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 532 | |
7c1a38e3 | 533 | free_irq(dev->irq, dev); |
1da177e4 LT |
534 | |
535 | return 0; | |
536 | } | |
537 | EXPORT_SYMBOL(drm_irq_uninstall); | |
538 | ||
f5752b38 | 539 | /* |
1da177e4 LT |
540 | * IRQ control ioctl. |
541 | * | |
542 | * \param inode device inode. | |
6c340eac | 543 | * \param file_priv DRM file private. |
1da177e4 LT |
544 | * \param cmd command. |
545 | * \param arg user argument, pointing to a drm_control structure. | |
546 | * \return zero on success or a negative number on failure. | |
547 | * | |
548 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
549 | */ | |
c153f45f EA |
550 | int drm_control(struct drm_device *dev, void *data, |
551 | struct drm_file *file_priv) | |
1da177e4 | 552 | { |
c153f45f | 553 | struct drm_control *ctl = data; |
a319c1a4 | 554 | int ret = 0, irq; |
b5e89ed5 | 555 | |
27641c3f MK |
556 | /* if we haven't irq we fallback for compatibility reasons - |
557 | * this used to be a separate function in drm_dma.h | |
558 | */ | |
1da177e4 | 559 | |
22471cf6 DV |
560 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
561 | return 0; | |
562 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
563 | return 0; | |
564 | /* UMS was only ever support on pci devices. */ | |
565 | if (WARN_ON(!dev->pdev)) | |
566 | return -EINVAL; | |
1da177e4 | 567 | |
c153f45f | 568 | switch (ctl->func) { |
1da177e4 | 569 | case DRM_INST_HANDLER: |
a319c1a4 DV |
570 | irq = dev->pdev->irq; |
571 | ||
1da177e4 | 572 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 573 | ctl->irq != irq) |
1da177e4 | 574 | return -EINVAL; |
e090c53b | 575 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 576 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
577 | mutex_unlock(&dev->struct_mutex); |
578 | ||
579 | return ret; | |
1da177e4 | 580 | case DRM_UNINST_HANDLER: |
e090c53b DV |
581 | mutex_lock(&dev->struct_mutex); |
582 | ret = drm_irq_uninstall(dev); | |
583 | mutex_unlock(&dev->struct_mutex); | |
584 | ||
585 | return ret; | |
1da177e4 LT |
586 | default: |
587 | return -EINVAL; | |
588 | } | |
589 | } | |
590 | ||
27641c3f | 591 | /** |
f5752b38 DV |
592 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
593 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
594 | * @mode: display mode containing the scanout timings | |
27641c3f | 595 | * |
21b21560 VS |
596 | * Calculate and store various constants which are later |
597 | * needed by vblank and swap-completion timestamping, e.g, | |
598 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 599 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 600 | * things like panel scaling or other adjustments into account. |
27641c3f | 601 | */ |
545cdd55 VS |
602 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
603 | const struct drm_display_mode *mode) | |
27641c3f | 604 | { |
3c184f69 | 605 | int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; |
77666b72 | 606 | int dotclock = mode->crtc_clock; |
27641c3f MK |
607 | |
608 | /* Valid dotclock? */ | |
609 | if (dotclock > 0) { | |
0dae35a3 VS |
610 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
611 | ||
612 | /* | |
613 | * Convert scanline length in pixels and video | |
614 | * dot clock to line duration, frame duration | |
615 | * and pixel duration in nanoseconds: | |
27641c3f | 616 | */ |
0dae35a3 VS |
617 | pixeldur_ns = 1000000 / dotclock; |
618 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
619 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
620 | |
621 | /* | |
622 | * Fields of interlaced scanout modes are only half a frame duration. | |
623 | */ | |
624 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
625 | framedur_ns /= 2; | |
27641c3f MK |
626 | } else |
627 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", | |
628 | crtc->base.id); | |
629 | ||
630 | crtc->pixeldur_ns = pixeldur_ns; | |
631 | crtc->linedur_ns = linedur_ns; | |
632 | crtc->framedur_ns = framedur_ns; | |
633 | ||
634 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
545cdd55 VS |
635 | crtc->base.id, mode->crtc_htotal, |
636 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
27641c3f | 637 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", |
3c184f69 VS |
638 | crtc->base.id, dotclock, framedur_ns, |
639 | linedur_ns, pixeldur_ns); | |
27641c3f MK |
640 | } |
641 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
642 | ||
643 | /** | |
f5752b38 DV |
644 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
645 | * @dev: DRM device | |
646 | * @crtc: Which CRTC's vblank timestamp to retrieve | |
647 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
648 | * On return contains true maximum error of timestamp | |
649 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
650 | * @flags: Flags to pass to driver: | |
651 | * 0 = Default, | |
652 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
653 | * @refcrtc: CRTC which defines scanout timing | |
654 | * @mode: mode which defines the scanout timings | |
655 | * | |
656 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
657 | * timings and current video scanout position of a CRTC. This can be called from | |
658 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
659 | * actual timestamping. | |
27641c3f MK |
660 | * |
661 | * Should return timestamps conforming to the OML_sync_control OpenML | |
662 | * extension specification. The timestamp corresponds to the end of | |
663 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
664 | * pixel in the following video frame. | |
665 | * | |
666 | * Requires support for optional dev->driver->get_scanout_position() | |
667 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
668 | * that corresponds to the true scanout timing. | |
669 | * | |
670 | * The current implementation only handles standard video modes. It | |
671 | * returns as no operation if a doublescan or interlaced video mode is | |
672 | * active. Higher level code is expected to handle this. | |
673 | * | |
f5752b38 DV |
674 | * Returns: |
675 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
676 | * video mode: |
677 | * | |
f5752b38 | 678 | * -EINVAL - Invalid CRTC. |
27641c3f MK |
679 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
680 | * -ENOTSUPP - Function not supported in current display mode. | |
681 | * -EIO - Failed, e.g., due to failed scanout position query. | |
682 | * | |
683 | * Returns or'ed positive status flags on success: | |
684 | * | |
685 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
686 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
687 | * | |
688 | */ | |
689 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, | |
690 | int *max_error, | |
691 | struct timeval *vblank_time, | |
692 | unsigned flags, | |
7da903ef VS |
693 | const struct drm_crtc *refcrtc, |
694 | const struct drm_display_mode *mode) | |
27641c3f | 695 | { |
e62f2f5a | 696 | struct timeval tv_etime; |
d2cb58c8 | 697 | ktime_t stime, etime; |
8072bfa6 | 698 | int vbl_status; |
27641c3f | 699 | int vpos, hpos, i; |
3c184f69 | 700 | int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; |
27641c3f MK |
701 | bool invbl; |
702 | ||
703 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
704 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
705 | return -EINVAL; | |
706 | } | |
707 | ||
708 | /* Scanout position query not supported? Should not happen. */ | |
709 | if (!dev->driver->get_scanout_position) { | |
710 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
711 | return -EIO; | |
712 | } | |
713 | ||
27641c3f MK |
714 | /* Durations of frames, lines, pixels in nanoseconds. */ |
715 | framedur_ns = refcrtc->framedur_ns; | |
716 | linedur_ns = refcrtc->linedur_ns; | |
717 | pixeldur_ns = refcrtc->pixeldur_ns; | |
718 | ||
719 | /* If mode timing undefined, just return as no-op: | |
720 | * Happens during initial modesetting of a crtc. | |
721 | */ | |
8072bfa6 | 722 | if (framedur_ns == 0) { |
27641c3f MK |
723 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); |
724 | return -EAGAIN; | |
725 | } | |
726 | ||
27641c3f MK |
727 | /* Get current scanout position with system timestamp. |
728 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
729 | * if single query takes longer than max_error nanoseconds. | |
730 | * | |
731 | * This guarantees a tight bound on maximum error if | |
732 | * code gets preempted or delayed for some reason. | |
733 | */ | |
734 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
735 | /* |
736 | * Get vertical and horizontal scanout position vpos, hpos, | |
737 | * and bounding timestamps stime, etime, pre/post query. | |
738 | */ | |
abca9e45 | 739 | vbl_status = dev->driver->get_scanout_position(dev, crtc, flags, &vpos, |
8f6fce03 | 740 | &hpos, &stime, &etime); |
27641c3f | 741 | |
27641c3f MK |
742 | /* Return as no-op if scanout query unsupported or failed. */ |
743 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
744 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
745 | crtc, vbl_status); | |
746 | return -EIO; | |
747 | } | |
748 | ||
8f6fce03 | 749 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 750 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
751 | |
752 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 753 | if (duration_ns <= *max_error) |
27641c3f MK |
754 | break; |
755 | } | |
756 | ||
757 | /* Noisy system timing? */ | |
758 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
759 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
3c184f69 | 760 | crtc, duration_ns/1000, *max_error/1000, i); |
27641c3f MK |
761 | } |
762 | ||
763 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 764 | *max_error = duration_ns; |
27641c3f MK |
765 | |
766 | /* Check if in vblank area: | |
767 | * vpos is >=0 in video scanout area, but negative | |
768 | * within vblank area, counting down the number of lines until | |
769 | * start of scanout. | |
770 | */ | |
3d3cbd84 | 771 | invbl = vbl_status & DRM_SCANOUTPOS_IN_VBLANK; |
27641c3f MK |
772 | |
773 | /* Convert scanout position into elapsed time at raw_time query | |
774 | * since start of scanout at first display scanline. delta_ns | |
775 | * can be negative if start of scanout hasn't happened yet. | |
776 | */ | |
3c184f69 | 777 | delta_ns = vpos * linedur_ns + hpos * pixeldur_ns; |
27641c3f | 778 | |
c61eef72 | 779 | if (!drm_timestamp_monotonic) |
d2cb58c8 | 780 | etime = ktime_mono_to_real(etime); |
c61eef72 | 781 | |
e62f2f5a ID |
782 | /* save this only for debugging purposes */ |
783 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
784 | /* Subtract time delta from raw timestamp to get final |
785 | * vblank_time timestamp for end of vblank. | |
786 | */ | |
e91abf80 MD |
787 | if (delta_ns < 0) |
788 | etime = ktime_add_ns(etime, -delta_ns); | |
789 | else | |
790 | etime = ktime_sub_ns(etime, delta_ns); | |
e62f2f5a | 791 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 792 | |
bbb0aef5 JP |
793 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
794 | crtc, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 795 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 | 796 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
3c184f69 | 797 | duration_ns/1000, i); |
27641c3f MK |
798 | |
799 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
800 | if (invbl) | |
3d3cbd84 | 801 | vbl_status |= DRM_VBLANKTIME_IN_VBLANK; |
27641c3f MK |
802 | |
803 | return vbl_status; | |
804 | } | |
805 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
806 | ||
c61eef72 ID |
807 | static struct timeval get_drm_timestamp(void) |
808 | { | |
809 | ktime_t now; | |
810 | ||
d2cb58c8 | 811 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
c61eef72 ID |
812 | return ktime_to_timeval(now); |
813 | } | |
814 | ||
27641c3f MK |
815 | /** |
816 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
4dfd909f | 817 | * vblank interval |
27641c3f | 818 | * @dev: DRM device |
f5752b38 | 819 | * @crtc: which CRTC's vblank timestamp to retrieve |
27641c3f MK |
820 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
821 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
822 | * 0 = Default, |
823 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
824 | * |
825 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 826 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
827 | * compute the timestamp with a high-precision GPU specific method. |
828 | * | |
829 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
830 | * call, i.e., it isn't very precisely locked to the true vblank. | |
831 | * | |
f5752b38 | 832 | * Returns: |
fb446a1a | 833 | * True if timestamp is considered to be very precise, false otherwise. |
27641c3f | 834 | */ |
fb446a1a DV |
835 | static bool |
836 | drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
837 | struct timeval *tvblank, unsigned flags) | |
27641c3f | 838 | { |
4a1b0714 | 839 | int ret; |
27641c3f MK |
840 | |
841 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
842 | int max_error = (int) drm_timestamp_precision * 1000; | |
843 | ||
844 | /* Query driver if possible and precision timestamping enabled. */ | |
845 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
846 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
847 | tvblank, flags); | |
848 | if (ret > 0) | |
fb446a1a | 849 | return true; |
27641c3f MK |
850 | } |
851 | ||
852 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 853 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 854 | */ |
c61eef72 | 855 | *tvblank = get_drm_timestamp(); |
27641c3f | 856 | |
fb446a1a | 857 | return false; |
27641c3f | 858 | } |
27641c3f | 859 | |
0a3e67a4 JB |
860 | /** |
861 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
862 | * @dev: DRM device | |
863 | * @crtc: which counter to retrieve | |
864 | * | |
865 | * Fetches the "cooked" vblank count value that represents the number of | |
866 | * vblank events since the system was booted, including lost events due to | |
867 | * modesetting activity. | |
f5752b38 | 868 | * |
96d3f91e TR |
869 | * This is the legacy version of drm_crtc_vblank_count(). |
870 | * | |
f5752b38 DV |
871 | * Returns: |
872 | * The software vblank counter. | |
0a3e67a4 JB |
873 | */ |
874 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
875 | { | |
8a51d5be VS |
876 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
877 | ||
e6ae8687 RC |
878 | if (WARN_ON(crtc >= dev->num_crtcs)) |
879 | return 0; | |
99264a61 | 880 | return vblank->count; |
0a3e67a4 JB |
881 | } |
882 | EXPORT_SYMBOL(drm_vblank_count); | |
883 | ||
96d3f91e TR |
884 | /** |
885 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
886 | * @crtc: which counter to retrieve | |
887 | * | |
888 | * Fetches the "cooked" vblank count value that represents the number of | |
889 | * vblank events since the system was booted, including lost events due to | |
890 | * modesetting activity. | |
891 | * | |
892 | * This is the native KMS version of drm_vblank_count(). | |
893 | * | |
894 | * Returns: | |
895 | * The software vblank counter. | |
896 | */ | |
897 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) | |
898 | { | |
899 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
900 | } | |
901 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
902 | ||
27641c3f MK |
903 | /** |
904 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
905 | * and the system timestamp corresponding to that vblank counter value. | |
906 | * | |
907 | * @dev: DRM device | |
908 | * @crtc: which counter to retrieve | |
909 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
910 | * | |
911 | * Fetches the "cooked" vblank count value that represents the number of | |
912 | * vblank events since the system was booted, including lost events due to | |
913 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 914 | * of the vblank interval that corresponds to the current vblank counter value. |
27641c3f MK |
915 | */ |
916 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
917 | struct timeval *vblanktime) | |
918 | { | |
8a51d5be | 919 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
920 | u32 cur_vblank; |
921 | ||
e6ae8687 RC |
922 | if (WARN_ON(crtc >= dev->num_crtcs)) |
923 | return 0; | |
924 | ||
99264a61 DV |
925 | /* |
926 | * Vblank timestamps are read lockless. To ensure consistency the vblank | |
927 | * counter is rechecked and ordering is ensured using memory barriers. | |
928 | * This works like a seqlock. The write-side barriers are in store_vblank. | |
27641c3f MK |
929 | */ |
930 | do { | |
99264a61 DV |
931 | cur_vblank = vblank->count; |
932 | smp_rmb(); | |
27641c3f MK |
933 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); |
934 | smp_rmb(); | |
99264a61 | 935 | } while (cur_vblank != vblank->count); |
27641c3f MK |
936 | |
937 | return cur_vblank; | |
938 | } | |
939 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
940 | ||
c6eefa17 RC |
941 | static void send_vblank_event(struct drm_device *dev, |
942 | struct drm_pending_vblank_event *e, | |
943 | unsigned long seq, struct timeval *now) | |
944 | { | |
945 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
946 | e->event.sequence = seq; | |
947 | e->event.tv_sec = now->tv_sec; | |
948 | e->event.tv_usec = now->tv_usec; | |
949 | ||
950 | list_add_tail(&e->base.link, | |
951 | &e->base.file_priv->event_list); | |
952 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
953 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
954 | e->event.sequence); | |
955 | } | |
956 | ||
957 | /** | |
958 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
959 | * @dev: DRM device | |
960 | * @crtc: CRTC in question | |
961 | * @e: the event to send | |
962 | * | |
963 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
964 | * Caller must hold event lock. | |
a4d7b30d TR |
965 | * |
966 | * This is the legacy version of drm_crtc_send_vblank_event(). | |
c6eefa17 RC |
967 | */ |
968 | void drm_send_vblank_event(struct drm_device *dev, int crtc, | |
969 | struct drm_pending_vblank_event *e) | |
970 | { | |
971 | struct timeval now; | |
972 | unsigned int seq; | |
4dfd909f | 973 | |
c6eefa17 RC |
974 | if (crtc >= 0) { |
975 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
976 | } else { | |
977 | seq = 0; | |
c61eef72 ID |
978 | |
979 | now = get_drm_timestamp(); | |
c6eefa17 | 980 | } |
21a245d2 | 981 | e->pipe = crtc; |
c6eefa17 RC |
982 | send_vblank_event(dev, e, seq, &now); |
983 | } | |
984 | EXPORT_SYMBOL(drm_send_vblank_event); | |
985 | ||
a4d7b30d TR |
986 | /** |
987 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
988 | * @crtc: the source CRTC of the vblank event | |
989 | * @e: the event to send | |
990 | * | |
991 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
992 | * Caller must hold event lock. | |
993 | * | |
994 | * This is the native KMS version of drm_send_vblank_event(). | |
995 | */ | |
996 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
997 | struct drm_pending_vblank_event *e) | |
998 | { | |
999 | drm_send_vblank_event(crtc->dev, drm_crtc_index(crtc), e); | |
1000 | } | |
1001 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
1002 | ||
f2752282 VS |
1003 | /** |
1004 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
1005 | * @dev: DRM device | |
1006 | * @crtc: CRTC in question | |
1007 | */ | |
1008 | static int drm_vblank_enable(struct drm_device *dev, int crtc) | |
1009 | { | |
8a51d5be | 1010 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f2752282 VS |
1011 | int ret = 0; |
1012 | ||
1013 | assert_spin_locked(&dev->vbl_lock); | |
1014 | ||
1015 | spin_lock(&dev->vblank_time_lock); | |
1016 | ||
8a51d5be | 1017 | if (!vblank->enabled) { |
1cfb80b1 DV |
1018 | /* |
1019 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
1020 | * All vblank count & timestamp updates are held off |
1021 | * until we are done reinitializing master counter and | |
1022 | * timestamps. Filtercode in drm_handle_vblank() will | |
1023 | * prevent double-accounting of same vblank interval. | |
1024 | */ | |
1025 | ret = dev->driver->enable_vblank(dev, crtc); | |
1026 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); | |
1027 | if (ret) | |
8a51d5be | 1028 | atomic_dec(&vblank->refcount); |
f2752282 | 1029 | else { |
8a51d5be | 1030 | vblank->enabled = true; |
f2752282 VS |
1031 | drm_update_vblank_count(dev, crtc); |
1032 | } | |
1033 | } | |
1034 | ||
1035 | spin_unlock(&dev->vblank_time_lock); | |
1036 | ||
1037 | return ret; | |
1038 | } | |
1039 | ||
0a3e67a4 JB |
1040 | /** |
1041 | * drm_vblank_get - get a reference count on vblank events | |
1042 | * @dev: DRM device | |
1043 | * @crtc: which CRTC to own | |
1044 | * | |
1045 | * Acquire a reference count on vblank events to avoid having them disabled | |
1046 | * while in use. | |
1047 | * | |
89dd6a4b DV |
1048 | * This is the legacy version of drm_crtc_vblank_get(). |
1049 | * | |
f5752b38 | 1050 | * Returns: |
0a3e67a4 JB |
1051 | * Zero on success, nonzero on failure. |
1052 | */ | |
1053 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
1054 | { | |
8a51d5be | 1055 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
97cbc883 | 1056 | unsigned long irqflags; |
0a3e67a4 JB |
1057 | int ret = 0; |
1058 | ||
e6ae8687 RC |
1059 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1060 | return -EINVAL; | |
1061 | ||
0a3e67a4 JB |
1062 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1063 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 1064 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
f2752282 | 1065 | ret = drm_vblank_enable(dev, crtc); |
778c9026 | 1066 | } else { |
8a51d5be VS |
1067 | if (!vblank->enabled) { |
1068 | atomic_dec(&vblank->refcount); | |
778c9026 | 1069 | ret = -EINVAL; |
0a3e67a4 JB |
1070 | } |
1071 | } | |
1072 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1073 | ||
1074 | return ret; | |
1075 | } | |
1076 | EXPORT_SYMBOL(drm_vblank_get); | |
1077 | ||
89dd6a4b DV |
1078 | /** |
1079 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1080 | * @crtc: which CRTC to own | |
1081 | * | |
1082 | * Acquire a reference count on vblank events to avoid having them disabled | |
1083 | * while in use. | |
1084 | * | |
30b79f06 | 1085 | * This is the native kms version of drm_vblank_get(). |
89dd6a4b DV |
1086 | * |
1087 | * Returns: | |
1088 | * Zero on success, nonzero on failure. | |
1089 | */ | |
1090 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1091 | { | |
1092 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1093 | } | |
1094 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1095 | ||
0a3e67a4 JB |
1096 | /** |
1097 | * drm_vblank_put - give up ownership of vblank events | |
1098 | * @dev: DRM device | |
1099 | * @crtc: which counter to give up | |
1100 | * | |
1101 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 1102 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
1103 | * |
1104 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 JB |
1105 | */ |
1106 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
1107 | { | |
8a51d5be VS |
1108 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
1109 | ||
7f907bf2 RC |
1110 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) |
1111 | return; | |
b3f5e732 | 1112 | |
e6ae8687 RC |
1113 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1114 | return; | |
1115 | ||
0a3e67a4 | 1116 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1117 | if (atomic_dec_and_test(&vblank->refcount)) { |
ab8905f1 DV |
1118 | if (drm_vblank_offdelay == 0) |
1119 | return; | |
1120 | else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) | |
4ed0ce3d | 1121 | vblank_disable_fn((unsigned long)vblank); |
ab8905f1 | 1122 | else |
4ed0ce3d VS |
1123 | mod_timer(&vblank->disable_timer, |
1124 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1125 | } | |
0a3e67a4 JB |
1126 | } |
1127 | EXPORT_SYMBOL(drm_vblank_put); | |
1128 | ||
89dd6a4b DV |
1129 | /** |
1130 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1131 | * @crtc: which counter to give up | |
1132 | * | |
1133 | * Release ownership of a given vblank counter, turning off interrupts | |
1134 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1135 | * | |
1136 | * This is the native kms version of drm_vblank_put(). | |
1137 | */ | |
1138 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1139 | { | |
1140 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1141 | } | |
1142 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1143 | ||
e8450f51 DV |
1144 | /** |
1145 | * drm_wait_one_vblank - wait for one vblank | |
1146 | * @dev: DRM device | |
1147 | * @crtc: crtc index | |
1148 | * | |
1149 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1150 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1151 | * due to lack of driver support or because the crtc is off. | |
1152 | */ | |
1153 | void drm_wait_one_vblank(struct drm_device *dev, int crtc) | |
1154 | { | |
1155 | int ret; | |
1156 | u32 last; | |
1157 | ||
1158 | ret = drm_vblank_get(dev, crtc); | |
80c873b6 | 1159 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", crtc, ret)) |
e8450f51 DV |
1160 | return; |
1161 | ||
1162 | last = drm_vblank_count(dev, crtc); | |
1163 | ||
1164 | ret = wait_event_timeout(dev->vblank[crtc].queue, | |
1165 | last != drm_vblank_count(dev, crtc), | |
1166 | msecs_to_jiffies(100)); | |
1167 | ||
80c873b6 | 1168 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", crtc); |
e8450f51 DV |
1169 | |
1170 | drm_vblank_put(dev, crtc); | |
1171 | } | |
1172 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1173 | ||
1174 | /** | |
1175 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1176 | * @crtc: DRM crtc | |
1177 | * | |
1178 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1179 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1180 | * due to lack of driver support or because the crtc is off. | |
1181 | */ | |
1182 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1183 | { | |
1184 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1185 | } | |
1186 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1187 | ||
c6eefa17 RC |
1188 | /** |
1189 | * drm_vblank_off - disable vblank events on a CRTC | |
1190 | * @dev: DRM device | |
1191 | * @crtc: CRTC in question | |
1192 | * | |
f5752b38 DV |
1193 | * Drivers can use this function to shut down the vblank interrupt handling when |
1194 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1195 | * stored so that drm_vblank_on() can restore it again. | |
1196 | * | |
1197 | * Drivers must use this function when the hardware vblank counter can get | |
1198 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1199 | * |
1200 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1201 | */ |
778c9026 LP |
1202 | void drm_vblank_off(struct drm_device *dev, int crtc) |
1203 | { | |
8a51d5be | 1204 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
498548ec CJHR |
1205 | struct drm_pending_vblank_event *e, *t; |
1206 | struct timeval now; | |
778c9026 | 1207 | unsigned long irqflags; |
498548ec | 1208 | unsigned int seq; |
778c9026 | 1209 | |
e6ae8687 RC |
1210 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1211 | return; | |
1212 | ||
56cc279b VS |
1213 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1214 | ||
1215 | spin_lock(&dev->vbl_lock); | |
27641c3f | 1216 | vblank_disable_and_save(dev, crtc); |
8a51d5be | 1217 | wake_up(&vblank->queue); |
498548ec | 1218 | |
56cc279b VS |
1219 | /* |
1220 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1221 | * the vblank interrupt by bumping the refcount. | |
1222 | */ | |
1223 | if (!vblank->inmodeset) { | |
1224 | atomic_inc(&vblank->refcount); | |
1225 | vblank->inmodeset = 1; | |
1226 | } | |
1227 | spin_unlock(&dev->vbl_lock); | |
1228 | ||
498548ec CJHR |
1229 | /* Send any queued vblank events, lest the natives grow disquiet */ |
1230 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
e7783ba3 | 1231 | |
498548ec CJHR |
1232 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
1233 | if (e->pipe != crtc) | |
1234 | continue; | |
1235 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
1236 | wanted %d, current %d\n", | |
1237 | e->event.sequence, seq); | |
c6eefa17 | 1238 | list_del(&e->base.link); |
498548ec | 1239 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1240 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1241 | } |
56cc279b | 1242 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 LP |
1243 | } |
1244 | EXPORT_SYMBOL(drm_vblank_off); | |
1245 | ||
89dd6a4b DV |
1246 | /** |
1247 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1248 | * @crtc: CRTC in question | |
1249 | * | |
1250 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1251 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1252 | * stored so that drm_vblank_on can restore it again. | |
1253 | * | |
1254 | * Drivers must use this function when the hardware vblank counter can get | |
1255 | * reset, e.g. when suspending. | |
1256 | * | |
1257 | * This is the native kms version of drm_vblank_off(). | |
1258 | */ | |
1259 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1260 | { | |
1261 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1262 | } | |
1263 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1264 | ||
9625604c DV |
1265 | /** |
1266 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
1267 | * @crtc: CRTC in question | |
1268 | * | |
1269 | * Drivers can use this function to reset the vblank state to off at load time. | |
1270 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1271 | * drm_crtc_vblank_on() functions. The difference compared to | |
1272 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1273 | * and hence doesn't need to call any driver hooks. | |
1274 | */ | |
1275 | void drm_crtc_vblank_reset(struct drm_crtc *drm_crtc) | |
1276 | { | |
1277 | struct drm_device *dev = drm_crtc->dev; | |
1278 | unsigned long irqflags; | |
1279 | int crtc = drm_crtc_index(drm_crtc); | |
1280 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; | |
1281 | ||
1282 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1283 | /* | |
1284 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1285 | * interrupt by bumping the refcount. | |
1286 | */ | |
1287 | if (!vblank->inmodeset) { | |
1288 | atomic_inc(&vblank->refcount); | |
1289 | vblank->inmodeset = 1; | |
1290 | } | |
1291 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1292 | ||
1293 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1294 | } | |
1295 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1296 | ||
f2752282 VS |
1297 | /** |
1298 | * drm_vblank_on - enable vblank events on a CRTC | |
1299 | * @dev: DRM device | |
1300 | * @crtc: CRTC in question | |
f5752b38 DV |
1301 | * |
1302 | * This functions restores the vblank interrupt state captured with | |
1303 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1304 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
f5752b38 | 1305 | * in driver load code to reflect the current hardware state of the crtc. |
89dd6a4b DV |
1306 | * |
1307 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 VS |
1308 | */ |
1309 | void drm_vblank_on(struct drm_device *dev, int crtc) | |
1310 | { | |
8a51d5be | 1311 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f2752282 VS |
1312 | unsigned long irqflags; |
1313 | ||
e6ae8687 RC |
1314 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1315 | return; | |
1316 | ||
f2752282 | 1317 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
7ffd7a68 | 1318 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1319 | if (vblank->inmodeset) { |
1320 | atomic_dec(&vblank->refcount); | |
1321 | vblank->inmodeset = 0; | |
7ffd7a68 | 1322 | } |
f8ad028c VS |
1323 | |
1324 | /* | |
1325 | * sample the current counter to avoid random jumps | |
1326 | * when drm_vblank_enable() applies the diff | |
1327 | * | |
1328 | * -1 to make sure user will never see the same | |
1329 | * vblank counter value before and after a modeset | |
1330 | */ | |
8a51d5be | 1331 | vblank->last = |
f8ad028c VS |
1332 | (dev->driver->get_vblank_counter(dev, crtc) - 1) & |
1333 | dev->max_vblank_count; | |
cd19e52a VS |
1334 | /* |
1335 | * re-enable interrupts if there are users left, or the | |
1336 | * user wishes vblank interrupts to be enabled all the time. | |
1337 | */ | |
1338 | if (atomic_read(&vblank->refcount) != 0 || | |
1339 | (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0)) | |
f2752282 VS |
1340 | WARN_ON(drm_vblank_enable(dev, crtc)); |
1341 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1342 | } | |
1343 | EXPORT_SYMBOL(drm_vblank_on); | |
1344 | ||
89dd6a4b DV |
1345 | /** |
1346 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1347 | * @crtc: CRTC in question | |
1348 | * | |
1349 | * This functions restores the vblank interrupt state captured with | |
1350 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1351 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
89dd6a4b DV |
1352 | * in driver load code to reflect the current hardware state of the crtc. |
1353 | * | |
1354 | * This is the native kms version of drm_vblank_on(). | |
1355 | */ | |
1356 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1357 | { | |
1358 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1359 | } | |
1360 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1361 | ||
f453ba04 DA |
1362 | /** |
1363 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1364 | * @dev: DRM device | |
1365 | * @crtc: CRTC in question | |
f453ba04 DA |
1366 | * |
1367 | * Account for vblank events across mode setting events, which will likely | |
1368 | * reset the hardware frame counter. | |
f5752b38 DV |
1369 | * |
1370 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1371 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1372 | * software-side vblank frame counting will ensure that there are no jumps or | |
1373 | * discontinuities. | |
1374 | * | |
1375 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1376 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1377 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1378 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1379 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1380 | * counters. | |
1381 | * | |
1382 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1383 | * again. | |
f453ba04 DA |
1384 | */ |
1385 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
1386 | { | |
8a51d5be VS |
1387 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
1388 | ||
b7ea85a4 | 1389 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1390 | if (!dev->num_crtcs) |
1391 | return; | |
e6ae8687 RC |
1392 | |
1393 | if (WARN_ON(crtc >= dev->num_crtcs)) | |
1394 | return; | |
1395 | ||
f453ba04 DA |
1396 | /* |
1397 | * To avoid all the problems that might happen if interrupts | |
1398 | * were enabled/disabled around or between these calls, we just | |
1399 | * have the kernel take a reference on the CRTC (just once though | |
1400 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1401 | * so that interrupts remain enabled in the interim. | |
1402 | */ | |
8a51d5be VS |
1403 | if (!vblank->inmodeset) { |
1404 | vblank->inmodeset = 0x1; | |
b3f5e732 | 1405 | if (drm_vblank_get(dev, crtc) == 0) |
8a51d5be | 1406 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1407 | } |
1408 | } | |
1409 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1410 | ||
f5752b38 DV |
1411 | /** |
1412 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1413 | * @dev: DRM device | |
1414 | * @crtc: CRTC in question | |
1415 | * | |
1416 | * This function again drops the temporary vblank reference acquired in | |
1417 | * drm_vblank_pre_modeset. | |
1418 | */ | |
f453ba04 DA |
1419 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) |
1420 | { | |
8a51d5be | 1421 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f453ba04 DA |
1422 | unsigned long irqflags; |
1423 | ||
b7ea85a4 HC |
1424 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1425 | if (!dev->num_crtcs) | |
1426 | return; | |
1427 | ||
8a51d5be | 1428 | if (vblank->inmodeset) { |
f453ba04 | 1429 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
ba0bf120 | 1430 | dev->vblank_disable_allowed = true; |
f453ba04 | 1431 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1432 | |
8a51d5be | 1433 | if (vblank->inmodeset & 0x2) |
b3f5e732 CW |
1434 | drm_vblank_put(dev, crtc); |
1435 | ||
8a51d5be | 1436 | vblank->inmodeset = 0; |
f453ba04 DA |
1437 | } |
1438 | } | |
1439 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1440 | ||
f5752b38 | 1441 | /* |
0a3e67a4 JB |
1442 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1443 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1444 | * | |
1445 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1446 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1447 | * | |
1448 | * Generally the counter will reset across mode sets. If interrupts are | |
1449 | * enabled around this call, we don't have to do anything since the counter | |
1450 | * will have already been incremented. | |
1451 | */ | |
1452 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1453 | struct drm_file *file_priv) | |
1454 | { | |
1455 | struct drm_modeset_ctl *modeset = data; | |
19227561 | 1456 | unsigned int crtc; |
0a3e67a4 JB |
1457 | |
1458 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1459 | if (!dev->num_crtcs) | |
4a1b0714 | 1460 | return 0; |
0a3e67a4 | 1461 | |
29935554 LP |
1462 | /* KMS drivers handle this internally */ |
1463 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1464 | return 0; | |
1465 | ||
0a3e67a4 | 1466 | crtc = modeset->crtc; |
4a1b0714 LP |
1467 | if (crtc >= dev->num_crtcs) |
1468 | return -EINVAL; | |
0a3e67a4 | 1469 | |
0a3e67a4 JB |
1470 | switch (modeset->cmd) { |
1471 | case _DRM_PRE_MODESET: | |
f453ba04 | 1472 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1473 | break; |
1474 | case _DRM_POST_MODESET: | |
f453ba04 | 1475 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1476 | break; |
1477 | default: | |
4a1b0714 | 1478 | return -EINVAL; |
0a3e67a4 JB |
1479 | } |
1480 | ||
4a1b0714 | 1481 | return 0; |
0a3e67a4 JB |
1482 | } |
1483 | ||
c9a9c5e0 KH |
1484 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1485 | union drm_wait_vblank *vblwait, | |
1486 | struct drm_file *file_priv) | |
1487 | { | |
ffe7c73a | 1488 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1489 | struct drm_pending_vblank_event *e; |
1490 | struct timeval now; | |
1491 | unsigned long flags; | |
1492 | unsigned int seq; | |
ea5d552c | 1493 | int ret; |
c9a9c5e0 | 1494 | |
f76511b9 | 1495 | e = kzalloc(sizeof(*e), GFP_KERNEL); |
ea5d552c CW |
1496 | if (e == NULL) { |
1497 | ret = -ENOMEM; | |
1498 | goto err_put; | |
1499 | } | |
c9a9c5e0 KH |
1500 | |
1501 | e->pipe = pipe; | |
b9c2c9ae | 1502 | e->base.pid = current->pid; |
c9a9c5e0 | 1503 | e->event.base.type = DRM_EVENT_VBLANK; |
f76511b9 | 1504 | e->event.base.length = sizeof(e->event); |
c9a9c5e0 KH |
1505 | e->event.user_data = vblwait->request.signal; |
1506 | e->base.event = &e->event.base; | |
1507 | e->base.file_priv = file_priv; | |
1508 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1509 | ||
c9a9c5e0 KH |
1510 | spin_lock_irqsave(&dev->event_lock, flags); |
1511 | ||
ffe7c73a VS |
1512 | /* |
1513 | * drm_vblank_off() might have been called after we called | |
1514 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1515 | * around the vblank disable, so no need for further locking. | |
1516 | * The reference from drm_vblank_get() protects against | |
1517 | * vblank disable from another source. | |
1518 | */ | |
1519 | if (!vblank->enabled) { | |
1520 | ret = -EINVAL; | |
1521 | goto err_unlock; | |
1522 | } | |
1523 | ||
f76511b9 | 1524 | if (file_priv->event_space < sizeof(e->event)) { |
ea5d552c CW |
1525 | ret = -EBUSY; |
1526 | goto err_unlock; | |
c9a9c5e0 KH |
1527 | } |
1528 | ||
f76511b9 | 1529 | file_priv->event_space -= sizeof(e->event); |
27641c3f MK |
1530 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1531 | ||
c9a9c5e0 KH |
1532 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1533 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1534 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1535 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1536 | } |
1537 | ||
1538 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1539 | vblwait->request.sequence, seq, pipe); | |
1540 | ||
b9c2c9ae JB |
1541 | trace_drm_vblank_event_queued(current->pid, pipe, |
1542 | vblwait->request.sequence); | |
1543 | ||
c9a9c5e0 KH |
1544 | e->event.sequence = vblwait->request.sequence; |
1545 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1546 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1547 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1548 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1549 | } else { |
a6778e9e | 1550 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1551 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1552 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1553 | } |
1554 | ||
1555 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1556 | ||
1557 | return 0; | |
ea5d552c CW |
1558 | |
1559 | err_unlock: | |
1560 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1561 | kfree(e); | |
1562 | err_put: | |
6f331623 | 1563 | drm_vblank_put(dev, pipe); |
ea5d552c | 1564 | return ret; |
c9a9c5e0 KH |
1565 | } |
1566 | ||
f5752b38 | 1567 | /* |
1da177e4 LT |
1568 | * Wait for VBLANK. |
1569 | * | |
1570 | * \param inode device inode. | |
6c340eac | 1571 | * \param file_priv DRM file private. |
1da177e4 LT |
1572 | * \param cmd command. |
1573 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1574 | * \return zero on success or a negative number on failure. | |
1575 | * | |
30b23634 EA |
1576 | * This function enables the vblank interrupt on the pipe requested, then |
1577 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1578 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1579 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1580 | */ |
0a3e67a4 JB |
1581 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1582 | struct drm_file *file_priv) | |
1da177e4 | 1583 | { |
8a51d5be | 1584 | struct drm_vblank_crtc *vblank; |
c153f45f | 1585 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1586 | int ret; |
19b01b5f | 1587 | unsigned int flags, seq, crtc, high_crtc; |
1da177e4 | 1588 | |
4984979b DV |
1589 | if (!dev->irq_enabled) |
1590 | return -EINVAL; | |
1da177e4 | 1591 | |
30b23634 EA |
1592 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1593 | return -EINVAL; | |
1594 | ||
c153f45f | 1595 | if (vblwait->request.type & |
19b01b5f IH |
1596 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1597 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1598 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1599 | vblwait->request.type, |
19b01b5f IH |
1600 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1601 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MCA |
1602 | return -EINVAL; |
1603 | } | |
1604 | ||
c153f45f | 1605 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
19b01b5f IH |
1606 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1607 | if (high_crtc) | |
1608 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1609 | else | |
1610 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
0a3e67a4 | 1611 | if (crtc >= dev->num_crtcs) |
776c9443 MCA |
1612 | return -EINVAL; |
1613 | ||
8a51d5be VS |
1614 | vblank = &dev->vblank[crtc]; |
1615 | ||
0a3e67a4 JB |
1616 | ret = drm_vblank_get(dev, crtc); |
1617 | if (ret) { | |
8d3457ec | 1618 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1619 | return ret; |
1620 | } | |
1621 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1622 | |
c153f45f | 1623 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1624 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1625 | vblwait->request.sequence += seq; |
1626 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1627 | case _DRM_VBLANK_ABSOLUTE: |
1628 | break; | |
1629 | default: | |
0a3e67a4 JB |
1630 | ret = -EINVAL; |
1631 | goto done; | |
1da177e4 LT |
1632 | } |
1633 | ||
a6778e9e IH |
1634 | if (flags & _DRM_VBLANK_EVENT) { |
1635 | /* must hold on to the vblank ref until the event fires | |
1636 | * drm_vblank_put will be called asynchronously | |
1637 | */ | |
c9a9c5e0 | 1638 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); |
a6778e9e | 1639 | } |
c9a9c5e0 | 1640 | |
ab285d74 | 1641 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1642 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1643 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
1644 | } |
1645 | ||
30b23634 EA |
1646 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1647 | vblwait->request.sequence, crtc); | |
8a51d5be VS |
1648 | vblank->last_wait = vblwait->request.sequence; |
1649 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
30b23634 EA |
1650 | (((drm_vblank_count(dev, crtc) - |
1651 | vblwait->request.sequence) <= (1 << 23)) || | |
8a51d5be | 1652 | !vblank->enabled || |
30b23634 | 1653 | !dev->irq_enabled)); |
1da177e4 | 1654 | |
30b23634 EA |
1655 | if (ret != -EINTR) { |
1656 | struct timeval now; | |
1da177e4 | 1657 | |
27641c3f | 1658 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1659 | vblwait->reply.tval_sec = now.tv_sec; |
1660 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1661 | |
30b23634 EA |
1662 | DRM_DEBUG("returning %d to client\n", |
1663 | vblwait->reply.sequence); | |
1da177e4 | 1664 | } else { |
30b23634 | 1665 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1666 | } |
1667 | ||
0a3e67a4 JB |
1668 | done: |
1669 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1670 | return ret; |
1671 | } | |
1672 | ||
ea7f7abc | 1673 | static void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
c9a9c5e0 KH |
1674 | { |
1675 | struct drm_pending_vblank_event *e, *t; | |
1676 | struct timeval now; | |
c9a9c5e0 KH |
1677 | unsigned int seq; |
1678 | ||
56cc279b | 1679 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1680 | |
56cc279b | 1681 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1682 | |
1683 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1684 | if (e->pipe != crtc) | |
1685 | continue; | |
1686 | if ((seq - e->event.sequence) > (1<<23)) | |
1687 | continue; | |
1688 | ||
1689 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1690 | e->event.sequence, seq); | |
1691 | ||
c6eefa17 | 1692 | list_del(&e->base.link); |
c9a9c5e0 | 1693 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1694 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1695 | } |
1696 | ||
ac2874b9 | 1697 | trace_drm_vblank_event(crtc, seq); |
c9a9c5e0 KH |
1698 | } |
1699 | ||
0a3e67a4 JB |
1700 | /** |
1701 | * drm_handle_vblank - handle a vblank event | |
1702 | * @dev: DRM device | |
1703 | * @crtc: where this event occurred | |
1704 | * | |
1705 | * Drivers should call this routine in their vblank interrupt handlers to | |
1706 | * update the vblank counter and send any signals that may be pending. | |
115ebcd4 TR |
1707 | * |
1708 | * This is the legacy version of drm_crtc_handle_vblank(). | |
0a3e67a4 | 1709 | */ |
78c6e170 | 1710 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1711 | { |
8a51d5be | 1712 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
1713 | u32 vblcount; |
1714 | s64 diff_ns; | |
1715 | struct timeval tvblank; | |
1716 | unsigned long irqflags; | |
1717 | ||
ee3c7795 | 1718 | if (WARN_ON_ONCE(!dev->num_crtcs)) |
78c6e170 | 1719 | return false; |
c9a9c5e0 | 1720 | |
e6ae8687 RC |
1721 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1722 | return false; | |
1723 | ||
56cc279b VS |
1724 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1725 | ||
27641c3f MK |
1726 | /* Need timestamp lock to prevent concurrent execution with |
1727 | * vblank enable/disable, as this would cause inconsistent | |
1728 | * or corrupted timestamps and vblank counts. | |
1729 | */ | |
56cc279b | 1730 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1731 | |
1732 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1733 | if (!vblank->enabled) { |
56cc279b VS |
1734 | spin_unlock(&dev->vblank_time_lock); |
1735 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1736 | return false; |
27641c3f MK |
1737 | } |
1738 | ||
1739 | /* Fetch corresponding timestamp for this vblank interval from | |
1740 | * driver and store it in proper slot of timestamp ringbuffer. | |
1741 | */ | |
1742 | ||
1743 | /* Get current timestamp and count. */ | |
99264a61 | 1744 | vblcount = vblank->count; |
27641c3f MK |
1745 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); |
1746 | ||
1747 | /* Compute time difference to timestamp of last vblank */ | |
1748 | diff_ns = timeval_to_ns(&tvblank) - | |
1749 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1750 | ||
1751 | /* Update vblank timestamp and count if at least | |
1752 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1753 | * difference between last stored timestamp and current | |
1754 | * timestamp. A smaller difference means basically | |
1755 | * identical timestamps. Happens if this vblank has | |
1756 | * been already processed and this is a redundant call, | |
1757 | * e.g., due to spurious vblank interrupts. We need to | |
1758 | * ignore those for accounting. | |
1759 | */ | |
99264a61 DV |
1760 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) |
1761 | store_vblank(dev, crtc, 1, &tvblank); | |
1762 | else | |
27641c3f MK |
1763 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", |
1764 | crtc, (int) diff_ns); | |
27641c3f | 1765 | |
56cc279b VS |
1766 | spin_unlock(&dev->vblank_time_lock); |
1767 | ||
8a51d5be | 1768 | wake_up(&vblank->queue); |
c9a9c5e0 | 1769 | drm_handle_vblank_events(dev, crtc); |
27641c3f | 1770 | |
56cc279b VS |
1771 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1772 | ||
78c6e170 | 1773 | return true; |
0a3e67a4 JB |
1774 | } |
1775 | EXPORT_SYMBOL(drm_handle_vblank); | |
115ebcd4 TR |
1776 | |
1777 | /** | |
1778 | * drm_crtc_handle_vblank - handle a vblank event | |
1779 | * @crtc: where this event occurred | |
1780 | * | |
1781 | * Drivers should call this routine in their vblank interrupt handlers to | |
1782 | * update the vblank counter and send any signals that may be pending. | |
1783 | * | |
1784 | * This is the native KMS version of drm_handle_vblank(). | |
1785 | * | |
1786 | * Returns: | |
1787 | * True if the event was successfully handled, false on failure. | |
1788 | */ | |
1789 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1790 | { | |
1791 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1792 | } | |
1793 | EXPORT_SYMBOL(drm_crtc_handle_vblank); |