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" |
1da177e4 LT |
37 | |
38 | #include <linux/interrupt.h> /* For task queue support */ | |
5a0e3ad6 | 39 | #include <linux/slab.h> |
1da177e4 | 40 | |
28d52043 | 41 | #include <linux/vgaarb.h> |
2d1a8a48 | 42 | #include <linux/export.h> |
27641c3f MK |
43 | |
44 | /* Access macro for slots in vblank timestamp ringbuffer. */ | |
5380e929 VS |
45 | #define vblanktimestamp(dev, crtc, count) \ |
46 | ((dev)->vblank[crtc].time[(count) % DRM_VBLANKTIME_RBSIZE]) | |
27641c3f MK |
47 | |
48 | /* Retry timestamp calculation up to 3 times to satisfy | |
49 | * drm_timestamp_precision before giving up. | |
50 | */ | |
51 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
52 | ||
53 | /* Threshold in nanoseconds for detection of redundant | |
54 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
55 | */ | |
56 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
57 | ||
fb446a1a DV |
58 | static bool |
59 | drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
60 | struct timeval *tvblank, unsigned flags); | |
61 | ||
13b030af VS |
62 | /** |
63 | * drm_update_vblank_count - update the master vblank counter | |
64 | * @dev: DRM device | |
65 | * @crtc: counter to update | |
66 | * | |
67 | * Call back into the driver to update the appropriate vblank counter | |
68 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
69 | * update the last read value so we can deal with wraparound on the next | |
70 | * call if necessary. | |
71 | * | |
72 | * Only necessary when going from off->on, to account for frames we | |
73 | * didn't get an interrupt for. | |
74 | * | |
75 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
76 | * device vblank fields. | |
77 | */ | |
78 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
79 | { | |
8a51d5be | 80 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
fb446a1a DV |
81 | u32 cur_vblank, diff, tslot; |
82 | bool rc; | |
13b030af VS |
83 | struct timeval t_vblank; |
84 | ||
85 | /* | |
86 | * Interrupts were disabled prior to this call, so deal with counter | |
87 | * wrap if needed. | |
88 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
89 | * here if the register is small or we had vblank interrupts off for | |
90 | * a long time. | |
91 | * | |
92 | * We repeat the hardware vblank counter & timestamp query until | |
93 | * we get consistent results. This to prevent races between gpu | |
94 | * updating its hardware counter while we are retrieving the | |
95 | * corresponding vblank timestamp. | |
96 | */ | |
97 | do { | |
98 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
99 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
100 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
101 | ||
102 | /* Deal with counter wrap */ | |
8a51d5be VS |
103 | diff = cur_vblank - vblank->last; |
104 | if (cur_vblank < vblank->last) { | |
13b030af VS |
105 | diff += dev->max_vblank_count; |
106 | ||
107 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
8a51d5be | 108 | crtc, vblank->last, cur_vblank, diff); |
13b030af VS |
109 | } |
110 | ||
96a9fdd7 | 111 | DRM_DEBUG("updating vblank count on crtc %d, missed %d\n", |
13b030af VS |
112 | crtc, diff); |
113 | ||
114 | /* Reinitialize corresponding vblank timestamp if high-precision query | |
115 | * available. Skip this step if query unsupported or failed. Will | |
116 | * reinitialize delayed at next vblank interrupt in that case. | |
117 | */ | |
118 | if (rc) { | |
8a51d5be | 119 | tslot = atomic_read(&vblank->count) + diff; |
13b030af VS |
120 | vblanktimestamp(dev, crtc, tslot) = t_vblank; |
121 | } | |
122 | ||
123 | smp_mb__before_atomic(); | |
8a51d5be | 124 | atomic_add(diff, &vblank->count); |
13b030af VS |
125 | smp_mb__after_atomic(); |
126 | } | |
127 | ||
27641c3f MK |
128 | /* |
129 | * Disable vblank irq's on crtc, make sure that last vblank count | |
130 | * of hardware and corresponding consistent software vblank counter | |
131 | * are preserved, even if there are any spurious vblank irq's after | |
132 | * disable. | |
133 | */ | |
134 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
135 | { | |
8a51d5be | 136 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
137 | unsigned long irqflags; |
138 | u32 vblcount; | |
139 | s64 diff_ns; | |
fb446a1a | 140 | bool vblrc; |
27641c3f | 141 | struct timeval tvblank; |
0355cf3a | 142 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
143 | |
144 | /* Prevent vblank irq processing while disabling vblank irqs, | |
145 | * so no updates of timestamps or count can happen after we've | |
146 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 147 | */ |
27641c3f MK |
148 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
149 | ||
812e7465 VS |
150 | /* |
151 | * If the vblank interrupt was already disbled update the count | |
152 | * and timestamp to maintain the appearance that the counter | |
153 | * has been ticking all along until this time. This makes the | |
154 | * count account for the entire time between drm_vblank_on() and | |
155 | * drm_vblank_off(). | |
855d30b4 DV |
156 | * |
157 | * But only do this if precise vblank timestamps are available. | |
158 | * Otherwise we might read a totally bogus timestamp since drivers | |
159 | * lacking precise timestamp support rely upon sampling the system clock | |
160 | * at vblank interrupt time. Which obviously won't work out well if the | |
161 | * vblank interrupt is disabled. | |
812e7465 | 162 | */ |
855d30b4 | 163 | if (!vblank->enabled && |
fb446a1a | 164 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0)) { |
812e7465 VS |
165 | drm_update_vblank_count(dev, crtc); |
166 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
167 | return; | |
168 | } | |
169 | ||
27641c3f | 170 | dev->driver->disable_vblank(dev, crtc); |
8a51d5be | 171 | vblank->enabled = false; |
27641c3f MK |
172 | |
173 | /* No further vblank irq's will be processed after | |
174 | * this point. Get current hardware vblank count and | |
175 | * vblank timestamp, repeat until they are consistent. | |
176 | * | |
177 | * FIXME: There is still a race condition here and in | |
178 | * drm_update_vblank_count() which can cause off-by-one | |
179 | * reinitialization of software vblank counter. If gpu | |
180 | * vblank counter doesn't increment exactly at the leading | |
181 | * edge of a vblank interval, then we can lose 1 count if | |
182 | * we happen to execute between start of vblank and the | |
183 | * delayed gpu counter increment. | |
184 | */ | |
185 | do { | |
8a51d5be | 186 | vblank->last = dev->driver->get_vblank_counter(dev, crtc); |
27641c3f | 187 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); |
8a51d5be | 188 | } while (vblank->last != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc); |
0355cf3a EE |
189 | |
190 | if (!count) | |
191 | vblrc = 0; | |
27641c3f MK |
192 | |
193 | /* Compute time difference to stored timestamp of last vblank | |
194 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
195 | */ | |
8a51d5be | 196 | vblcount = atomic_read(&vblank->count); |
27641c3f MK |
197 | diff_ns = timeval_to_ns(&tvblank) - |
198 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
199 | ||
200 | /* If there is at least 1 msec difference between the last stored | |
201 | * timestamp and tvblank, then we are currently executing our | |
202 | * disable inside a new vblank interval, the tvblank timestamp | |
203 | * corresponds to this new vblank interval and the irq handler | |
204 | * for this vblank didn't run yet and won't run due to our disable. | |
205 | * Therefore we need to do the job of drm_handle_vblank() and | |
206 | * increment the vblank counter by one to account for this vblank. | |
207 | * | |
208 | * Skip this step if there isn't any high precision timestamp | |
209 | * available. In that case we can't account for this and just | |
210 | * hope for the best. | |
211 | */ | |
fb446a1a | 212 | if (vblrc && (abs64(diff_ns) > 1000000)) { |
c50d7521 VS |
213 | /* Store new timestamp in ringbuffer. */ |
214 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
215 | ||
216 | /* Increment cooked vblank count. This also atomically commits | |
217 | * the timestamp computed above. | |
218 | */ | |
219 | smp_mb__before_atomic(); | |
8a51d5be | 220 | atomic_inc(&vblank->count); |
4e857c58 | 221 | smp_mb__after_atomic(); |
bc215128 | 222 | } |
27641c3f | 223 | |
27641c3f | 224 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
225 | } |
226 | ||
0a3e67a4 JB |
227 | static void vblank_disable_fn(unsigned long arg) |
228 | { | |
e69595c2 VS |
229 | struct drm_vblank_crtc *vblank = (void *)arg; |
230 | struct drm_device *dev = vblank->dev; | |
0a3e67a4 | 231 | unsigned long irqflags; |
e69595c2 | 232 | int crtc = vblank->crtc; |
0a3e67a4 JB |
233 | |
234 | if (!dev->vblank_disable_allowed) | |
235 | return; | |
236 | ||
e69595c2 VS |
237 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
238 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
239 | DRM_DEBUG("disabling vblank on crtc %d\n", crtc); | |
240 | vblank_disable_and_save(dev, crtc); | |
0a3e67a4 | 241 | } |
e69595c2 | 242 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
243 | } |
244 | ||
f5752b38 DV |
245 | /** |
246 | * drm_vblank_cleanup - cleanup vblank support | |
247 | * @dev: DRM device | |
248 | * | |
249 | * This function cleans up any resources allocated in drm_vblank_init. | |
250 | */ | |
52440211 | 251 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 252 | { |
e69595c2 | 253 | int crtc; |
2368ffb1 | 254 | unsigned long irqflags; |
e69595c2 | 255 | |
0a3e67a4 JB |
256 | /* Bail if the driver didn't call drm_vblank_init() */ |
257 | if (dev->num_crtcs == 0) | |
258 | return; | |
259 | ||
e69595c2 | 260 | for (crtc = 0; crtc < dev->num_crtcs; crtc++) { |
8a51d5be VS |
261 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
262 | ||
263 | del_timer_sync(&vblank->disable_timer); | |
2368ffb1 MK |
264 | |
265 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
266 | vblank_disable_and_save(dev, crtc); | |
267 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
e69595c2 | 268 | } |
0a3e67a4 | 269 | |
5380e929 | 270 | kfree(dev->vblank); |
0a3e67a4 JB |
271 | |
272 | dev->num_crtcs = 0; | |
273 | } | |
e77cef9c | 274 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 275 | |
f5752b38 DV |
276 | /** |
277 | * drm_vblank_init - initialize vblank support | |
278 | * @dev: drm_device | |
279 | * @num_crtcs: number of crtcs supported by @dev | |
280 | * | |
281 | * This function initializes vblank support for @num_crtcs display pipelines. | |
282 | * | |
283 | * Returns: | |
284 | * Zero on success or a negative error code on failure. | |
285 | */ | |
0a3e67a4 JB |
286 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) |
287 | { | |
288 | int i, ret = -ENOMEM; | |
289 | ||
0a3e67a4 | 290 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
291 | spin_lock_init(&dev->vblank_time_lock); |
292 | ||
0a3e67a4 JB |
293 | dev->num_crtcs = num_crtcs; |
294 | ||
5380e929 VS |
295 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
296 | if (!dev->vblank) | |
0a3e67a4 JB |
297 | goto err; |
298 | ||
e69595c2 | 299 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
300 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
301 | ||
302 | vblank->dev = dev; | |
303 | vblank->crtc = i; | |
304 | init_waitqueue_head(&vblank->queue); | |
305 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
306 | (unsigned long)vblank); | |
e69595c2 | 307 | } |
27641c3f | 308 | |
8f6fce03 | 309 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
310 | |
311 | /* Driver specific high-precision vblank timestamping supported? */ | |
312 | if (dev->driver->get_vblank_timestamp) | |
313 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
314 | else | |
315 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
316 | ||
ba0bf120 VS |
317 | dev->vblank_disable_allowed = false; |
318 | ||
0a3e67a4 JB |
319 | return 0; |
320 | ||
321 | err: | |
79a093ae | 322 | dev->num_crtcs = 0; |
0a3e67a4 JB |
323 | return ret; |
324 | } | |
325 | EXPORT_SYMBOL(drm_vblank_init); | |
326 | ||
28d52043 DA |
327 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
328 | { | |
329 | struct drm_device *dev = cookie; | |
330 | ||
331 | if (dev->driver->vgaarb_irq) { | |
332 | dev->driver->vgaarb_irq(dev, state); | |
333 | return; | |
334 | } | |
335 | ||
336 | if (!dev->irq_enabled) | |
337 | return; | |
338 | ||
5037f8ac JS |
339 | if (state) { |
340 | if (dev->driver->irq_uninstall) | |
341 | dev->driver->irq_uninstall(dev); | |
342 | } else { | |
343 | if (dev->driver->irq_preinstall) | |
344 | dev->driver->irq_preinstall(dev); | |
345 | if (dev->driver->irq_postinstall) | |
346 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
347 | } |
348 | } | |
349 | ||
1da177e4 | 350 | /** |
f5752b38 DV |
351 | * drm_irq_install - install IRQ handler |
352 | * @dev: DRM device | |
353 | * @irq: IRQ number to install the handler for | |
1da177e4 | 354 | * |
0a3e67a4 | 355 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
356 | * irq_preinstall() and irq_postinstall() functions before and after the |
357 | * installation. | |
358 | * | |
359 | * This is the simplified helper interface provided for drivers with no special | |
360 | * needs. Drivers which need to install interrupt handlers for multiple | |
361 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
362 | * that vblank interrupts are available. | |
363 | * | |
364 | * Returns: | |
365 | * Zero on success or a negative error code on failure. | |
1da177e4 | 366 | */ |
bb0f1b5c | 367 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 368 | { |
4a1b0714 | 369 | int ret; |
b5e89ed5 | 370 | unsigned long sh_flags = 0; |
1da177e4 LT |
371 | |
372 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
373 | return -EINVAL; | |
374 | ||
7c1a38e3 | 375 | if (irq == 0) |
1da177e4 LT |
376 | return -EINVAL; |
377 | ||
1da177e4 | 378 | /* Driver must have been initialized */ |
e090c53b | 379 | if (!dev->dev_private) |
1da177e4 | 380 | return -EINVAL; |
1da177e4 | 381 | |
e090c53b | 382 | if (dev->irq_enabled) |
1da177e4 | 383 | return -EBUSY; |
4423843c | 384 | dev->irq_enabled = true; |
1da177e4 | 385 | |
7c1a38e3 | 386 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 387 | |
b5e89ed5 | 388 | /* Before installing handler */ |
5037f8ac JS |
389 | if (dev->driver->irq_preinstall) |
390 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 391 | |
b5e89ed5 | 392 | /* Install handler */ |
1da177e4 | 393 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 394 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 395 | |
7c1a38e3 | 396 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 397 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 398 | |
b5e89ed5 | 399 | if (ret < 0) { |
4423843c | 400 | dev->irq_enabled = false; |
1da177e4 LT |
401 | return ret; |
402 | } | |
403 | ||
28d52043 DA |
404 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
405 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
406 | ||
b5e89ed5 | 407 | /* After installing handler */ |
5037f8ac JS |
408 | if (dev->driver->irq_postinstall) |
409 | ret = dev->driver->irq_postinstall(dev); | |
410 | ||
0a3e67a4 | 411 | if (ret < 0) { |
4423843c | 412 | dev->irq_enabled = false; |
e1c44acc JS |
413 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
414 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
7c1a38e3 DV |
415 | free_irq(irq, dev); |
416 | } else { | |
417 | dev->irq = irq; | |
0a3e67a4 | 418 | } |
1da177e4 | 419 | |
0a3e67a4 | 420 | return ret; |
1da177e4 | 421 | } |
0a3e67a4 | 422 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
423 | |
424 | /** | |
f5752b38 DV |
425 | * drm_irq_uninstall - uninstall the IRQ handler |
426 | * @dev: DRM device | |
427 | * | |
428 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
429 | * This should only be called by drivers which used drm_irq_install() to set up | |
430 | * their interrupt handler. Other drivers must only reset | |
431 | * drm_device->irq_enabled to false. | |
1da177e4 | 432 | * |
f5752b38 DV |
433 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
434 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
435 | * the same function through an ioctl. | |
1da177e4 | 436 | * |
f5752b38 DV |
437 | * Returns: |
438 | * Zero on success or a negative error code on failure. | |
1da177e4 | 439 | */ |
27641c3f | 440 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 441 | { |
dc1336ff | 442 | unsigned long irqflags; |
4423843c VS |
443 | bool irq_enabled; |
444 | int i; | |
1da177e4 LT |
445 | |
446 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
447 | return -EINVAL; | |
448 | ||
1da177e4 | 449 | irq_enabled = dev->irq_enabled; |
4423843c | 450 | dev->irq_enabled = false; |
1da177e4 | 451 | |
dc1336ff JB |
452 | /* |
453 | * Wake up any waiters so they don't hang. | |
454 | */ | |
bde4889a BS |
455 | if (dev->num_crtcs) { |
456 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
457 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
458 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
459 | ||
460 | wake_up(&vblank->queue); | |
461 | vblank->enabled = false; | |
462 | vblank->last = | |
bde4889a BS |
463 | dev->driver->get_vblank_counter(dev, i); |
464 | } | |
465 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 466 | } |
dc1336ff | 467 | |
b5e89ed5 | 468 | if (!irq_enabled) |
1da177e4 LT |
469 | return -EINVAL; |
470 | ||
7c1a38e3 | 471 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 472 | |
28d52043 DA |
473 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
474 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
475 | ||
5037f8ac JS |
476 | if (dev->driver->irq_uninstall) |
477 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 478 | |
7c1a38e3 | 479 | free_irq(dev->irq, dev); |
1da177e4 LT |
480 | |
481 | return 0; | |
482 | } | |
483 | EXPORT_SYMBOL(drm_irq_uninstall); | |
484 | ||
f5752b38 | 485 | /* |
1da177e4 LT |
486 | * IRQ control ioctl. |
487 | * | |
488 | * \param inode device inode. | |
6c340eac | 489 | * \param file_priv DRM file private. |
1da177e4 LT |
490 | * \param cmd command. |
491 | * \param arg user argument, pointing to a drm_control structure. | |
492 | * \return zero on success or a negative number on failure. | |
493 | * | |
494 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
495 | */ | |
c153f45f EA |
496 | int drm_control(struct drm_device *dev, void *data, |
497 | struct drm_file *file_priv) | |
1da177e4 | 498 | { |
c153f45f | 499 | struct drm_control *ctl = data; |
a319c1a4 | 500 | int ret = 0, irq; |
b5e89ed5 | 501 | |
27641c3f MK |
502 | /* if we haven't irq we fallback for compatibility reasons - |
503 | * this used to be a separate function in drm_dma.h | |
504 | */ | |
1da177e4 | 505 | |
22471cf6 DV |
506 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
507 | return 0; | |
508 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
509 | return 0; | |
510 | /* UMS was only ever support on pci devices. */ | |
511 | if (WARN_ON(!dev->pdev)) | |
512 | return -EINVAL; | |
1da177e4 | 513 | |
c153f45f | 514 | switch (ctl->func) { |
1da177e4 | 515 | case DRM_INST_HANDLER: |
a319c1a4 DV |
516 | irq = dev->pdev->irq; |
517 | ||
1da177e4 | 518 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 519 | ctl->irq != irq) |
1da177e4 | 520 | return -EINVAL; |
e090c53b | 521 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 522 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
523 | mutex_unlock(&dev->struct_mutex); |
524 | ||
525 | return ret; | |
1da177e4 | 526 | case DRM_UNINST_HANDLER: |
e090c53b DV |
527 | mutex_lock(&dev->struct_mutex); |
528 | ret = drm_irq_uninstall(dev); | |
529 | mutex_unlock(&dev->struct_mutex); | |
530 | ||
531 | return ret; | |
1da177e4 LT |
532 | default: |
533 | return -EINVAL; | |
534 | } | |
535 | } | |
536 | ||
27641c3f | 537 | /** |
f5752b38 DV |
538 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
539 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
540 | * @mode: display mode containing the scanout timings | |
27641c3f | 541 | * |
21b21560 VS |
542 | * Calculate and store various constants which are later |
543 | * needed by vblank and swap-completion timestamping, e.g, | |
544 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 545 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 546 | * things like panel scaling or other adjustments into account. |
27641c3f | 547 | */ |
545cdd55 VS |
548 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
549 | const struct drm_display_mode *mode) | |
27641c3f | 550 | { |
3c184f69 | 551 | int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; |
77666b72 | 552 | int dotclock = mode->crtc_clock; |
27641c3f MK |
553 | |
554 | /* Valid dotclock? */ | |
555 | if (dotclock > 0) { | |
0dae35a3 VS |
556 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
557 | ||
558 | /* | |
559 | * Convert scanline length in pixels and video | |
560 | * dot clock to line duration, frame duration | |
561 | * and pixel duration in nanoseconds: | |
27641c3f | 562 | */ |
0dae35a3 VS |
563 | pixeldur_ns = 1000000 / dotclock; |
564 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
565 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
566 | |
567 | /* | |
568 | * Fields of interlaced scanout modes are only half a frame duration. | |
569 | */ | |
570 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
571 | framedur_ns /= 2; | |
27641c3f MK |
572 | } else |
573 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", | |
574 | crtc->base.id); | |
575 | ||
576 | crtc->pixeldur_ns = pixeldur_ns; | |
577 | crtc->linedur_ns = linedur_ns; | |
578 | crtc->framedur_ns = framedur_ns; | |
579 | ||
580 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
545cdd55 VS |
581 | crtc->base.id, mode->crtc_htotal, |
582 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
27641c3f | 583 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", |
3c184f69 VS |
584 | crtc->base.id, dotclock, framedur_ns, |
585 | linedur_ns, pixeldur_ns); | |
27641c3f MK |
586 | } |
587 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
588 | ||
589 | /** | |
f5752b38 DV |
590 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
591 | * @dev: DRM device | |
592 | * @crtc: Which CRTC's vblank timestamp to retrieve | |
593 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
594 | * On return contains true maximum error of timestamp | |
595 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
596 | * @flags: Flags to pass to driver: | |
597 | * 0 = Default, | |
598 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
599 | * @refcrtc: CRTC which defines scanout timing | |
600 | * @mode: mode which defines the scanout timings | |
601 | * | |
602 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
603 | * timings and current video scanout position of a CRTC. This can be called from | |
604 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
605 | * actual timestamping. | |
27641c3f MK |
606 | * |
607 | * Should return timestamps conforming to the OML_sync_control OpenML | |
608 | * extension specification. The timestamp corresponds to the end of | |
609 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
610 | * pixel in the following video frame. | |
611 | * | |
612 | * Requires support for optional dev->driver->get_scanout_position() | |
613 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
614 | * that corresponds to the true scanout timing. | |
615 | * | |
616 | * The current implementation only handles standard video modes. It | |
617 | * returns as no operation if a doublescan or interlaced video mode is | |
618 | * active. Higher level code is expected to handle this. | |
619 | * | |
f5752b38 DV |
620 | * Returns: |
621 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
622 | * video mode: |
623 | * | |
f5752b38 | 624 | * -EINVAL - Invalid CRTC. |
27641c3f MK |
625 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
626 | * -ENOTSUPP - Function not supported in current display mode. | |
627 | * -EIO - Failed, e.g., due to failed scanout position query. | |
628 | * | |
629 | * Returns or'ed positive status flags on success: | |
630 | * | |
631 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
632 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
633 | * | |
634 | */ | |
635 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, | |
636 | int *max_error, | |
637 | struct timeval *vblank_time, | |
638 | unsigned flags, | |
7da903ef VS |
639 | const struct drm_crtc *refcrtc, |
640 | const struct drm_display_mode *mode) | |
27641c3f | 641 | { |
e62f2f5a ID |
642 | ktime_t stime, etime, mono_time_offset; |
643 | struct timeval tv_etime; | |
8072bfa6 | 644 | int vbl_status; |
27641c3f | 645 | int vpos, hpos, i; |
3c184f69 | 646 | int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; |
27641c3f MK |
647 | bool invbl; |
648 | ||
649 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
650 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
651 | return -EINVAL; | |
652 | } | |
653 | ||
654 | /* Scanout position query not supported? Should not happen. */ | |
655 | if (!dev->driver->get_scanout_position) { | |
656 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
657 | return -EIO; | |
658 | } | |
659 | ||
27641c3f MK |
660 | /* Durations of frames, lines, pixels in nanoseconds. */ |
661 | framedur_ns = refcrtc->framedur_ns; | |
662 | linedur_ns = refcrtc->linedur_ns; | |
663 | pixeldur_ns = refcrtc->pixeldur_ns; | |
664 | ||
665 | /* If mode timing undefined, just return as no-op: | |
666 | * Happens during initial modesetting of a crtc. | |
667 | */ | |
8072bfa6 | 668 | if (framedur_ns == 0) { |
27641c3f MK |
669 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); |
670 | return -EAGAIN; | |
671 | } | |
672 | ||
27641c3f MK |
673 | /* Get current scanout position with system timestamp. |
674 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
675 | * if single query takes longer than max_error nanoseconds. | |
676 | * | |
677 | * This guarantees a tight bound on maximum error if | |
678 | * code gets preempted or delayed for some reason. | |
679 | */ | |
680 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
681 | /* |
682 | * Get vertical and horizontal scanout position vpos, hpos, | |
683 | * and bounding timestamps stime, etime, pre/post query. | |
684 | */ | |
abca9e45 | 685 | vbl_status = dev->driver->get_scanout_position(dev, crtc, flags, &vpos, |
8f6fce03 | 686 | &hpos, &stime, &etime); |
27641c3f | 687 | |
8f6fce03 MK |
688 | /* |
689 | * Get correction for CLOCK_MONOTONIC -> CLOCK_REALTIME if | |
690 | * CLOCK_REALTIME is requested. | |
691 | */ | |
c61eef72 ID |
692 | if (!drm_timestamp_monotonic) |
693 | mono_time_offset = ktime_get_monotonic_offset(); | |
27641c3f | 694 | |
27641c3f MK |
695 | /* Return as no-op if scanout query unsupported or failed. */ |
696 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
697 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
698 | crtc, vbl_status); | |
699 | return -EIO; | |
700 | } | |
701 | ||
8f6fce03 | 702 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 703 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
704 | |
705 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 706 | if (duration_ns <= *max_error) |
27641c3f MK |
707 | break; |
708 | } | |
709 | ||
710 | /* Noisy system timing? */ | |
711 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
712 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
3c184f69 | 713 | crtc, duration_ns/1000, *max_error/1000, i); |
27641c3f MK |
714 | } |
715 | ||
716 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 717 | *max_error = duration_ns; |
27641c3f MK |
718 | |
719 | /* Check if in vblank area: | |
720 | * vpos is >=0 in video scanout area, but negative | |
721 | * within vblank area, counting down the number of lines until | |
722 | * start of scanout. | |
723 | */ | |
724 | invbl = vbl_status & DRM_SCANOUTPOS_INVBL; | |
725 | ||
726 | /* Convert scanout position into elapsed time at raw_time query | |
727 | * since start of scanout at first display scanline. delta_ns | |
728 | * can be negative if start of scanout hasn't happened yet. | |
729 | */ | |
3c184f69 | 730 | delta_ns = vpos * linedur_ns + hpos * pixeldur_ns; |
27641c3f | 731 | |
c61eef72 ID |
732 | if (!drm_timestamp_monotonic) |
733 | etime = ktime_sub(etime, mono_time_offset); | |
734 | ||
e62f2f5a ID |
735 | /* save this only for debugging purposes */ |
736 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
737 | /* Subtract time delta from raw timestamp to get final |
738 | * vblank_time timestamp for end of vblank. | |
739 | */ | |
e91abf80 MD |
740 | if (delta_ns < 0) |
741 | etime = ktime_add_ns(etime, -delta_ns); | |
742 | else | |
743 | etime = ktime_sub_ns(etime, delta_ns); | |
e62f2f5a | 744 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 745 | |
bbb0aef5 JP |
746 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
747 | crtc, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 748 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 | 749 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
3c184f69 | 750 | duration_ns/1000, i); |
27641c3f MK |
751 | |
752 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
753 | if (invbl) | |
754 | vbl_status |= DRM_VBLANKTIME_INVBL; | |
755 | ||
756 | return vbl_status; | |
757 | } | |
758 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
759 | ||
c61eef72 ID |
760 | static struct timeval get_drm_timestamp(void) |
761 | { | |
762 | ktime_t now; | |
763 | ||
764 | now = ktime_get(); | |
765 | if (!drm_timestamp_monotonic) | |
766 | now = ktime_sub(now, ktime_get_monotonic_offset()); | |
767 | ||
768 | return ktime_to_timeval(now); | |
769 | } | |
770 | ||
27641c3f MK |
771 | /** |
772 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
f5752b38 | 773 | * vblank interval |
27641c3f | 774 | * @dev: DRM device |
f5752b38 | 775 | * @crtc: which CRTC's vblank timestamp to retrieve |
27641c3f MK |
776 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
777 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
778 | * 0 = Default, |
779 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
780 | * |
781 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 782 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
783 | * compute the timestamp with a high-precision GPU specific method. |
784 | * | |
785 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
786 | * call, i.e., it isn't very precisely locked to the true vblank. | |
787 | * | |
f5752b38 | 788 | * Returns: |
fb446a1a | 789 | * True if timestamp is considered to be very precise, false otherwise. |
27641c3f | 790 | */ |
fb446a1a DV |
791 | static bool |
792 | drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
793 | struct timeval *tvblank, unsigned flags) | |
27641c3f | 794 | { |
4a1b0714 | 795 | int ret; |
27641c3f MK |
796 | |
797 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
798 | int max_error = (int) drm_timestamp_precision * 1000; | |
799 | ||
800 | /* Query driver if possible and precision timestamping enabled. */ | |
801 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
802 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
803 | tvblank, flags); | |
804 | if (ret > 0) | |
fb446a1a | 805 | return true; |
27641c3f MK |
806 | } |
807 | ||
808 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 809 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 810 | */ |
c61eef72 | 811 | *tvblank = get_drm_timestamp(); |
27641c3f | 812 | |
fb446a1a | 813 | return false; |
27641c3f | 814 | } |
27641c3f | 815 | |
0a3e67a4 JB |
816 | /** |
817 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
818 | * @dev: DRM device | |
819 | * @crtc: which counter to retrieve | |
820 | * | |
821 | * Fetches the "cooked" vblank count value that represents the number of | |
822 | * vblank events since the system was booted, including lost events due to | |
823 | * modesetting activity. | |
f5752b38 DV |
824 | * |
825 | * Returns: | |
826 | * The software vblank counter. | |
0a3e67a4 JB |
827 | */ |
828 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
829 | { | |
8a51d5be VS |
830 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
831 | ||
832 | return atomic_read(&vblank->count); | |
0a3e67a4 JB |
833 | } |
834 | EXPORT_SYMBOL(drm_vblank_count); | |
835 | ||
27641c3f MK |
836 | /** |
837 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
838 | * and the system timestamp corresponding to that vblank counter value. | |
839 | * | |
840 | * @dev: DRM device | |
841 | * @crtc: which counter to retrieve | |
842 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
843 | * | |
844 | * Fetches the "cooked" vblank count value that represents the number of | |
845 | * vblank events since the system was booted, including lost events due to | |
846 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 847 | * of the vblank interval that corresponds to the current vblank counter value. |
27641c3f MK |
848 | */ |
849 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
850 | struct timeval *vblanktime) | |
851 | { | |
8a51d5be | 852 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
853 | u32 cur_vblank; |
854 | ||
855 | /* Read timestamp from slot of _vblank_time ringbuffer | |
856 | * that corresponds to current vblank count. Retry if | |
857 | * count has incremented during readout. This works like | |
858 | * a seqlock. | |
859 | */ | |
860 | do { | |
8a51d5be | 861 | cur_vblank = atomic_read(&vblank->count); |
27641c3f MK |
862 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); |
863 | smp_rmb(); | |
8a51d5be | 864 | } while (cur_vblank != atomic_read(&vblank->count)); |
27641c3f MK |
865 | |
866 | return cur_vblank; | |
867 | } | |
868 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
869 | ||
c6eefa17 RC |
870 | static void send_vblank_event(struct drm_device *dev, |
871 | struct drm_pending_vblank_event *e, | |
872 | unsigned long seq, struct timeval *now) | |
873 | { | |
874 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
875 | e->event.sequence = seq; | |
876 | e->event.tv_sec = now->tv_sec; | |
877 | e->event.tv_usec = now->tv_usec; | |
878 | ||
879 | list_add_tail(&e->base.link, | |
880 | &e->base.file_priv->event_list); | |
881 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
882 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
883 | e->event.sequence); | |
884 | } | |
885 | ||
886 | /** | |
887 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
888 | * @dev: DRM device | |
889 | * @crtc: CRTC in question | |
890 | * @e: the event to send | |
891 | * | |
892 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
893 | * Caller must hold event lock. | |
894 | */ | |
895 | void drm_send_vblank_event(struct drm_device *dev, int crtc, | |
896 | struct drm_pending_vblank_event *e) | |
897 | { | |
898 | struct timeval now; | |
899 | unsigned int seq; | |
900 | if (crtc >= 0) { | |
901 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
902 | } else { | |
903 | seq = 0; | |
c61eef72 ID |
904 | |
905 | now = get_drm_timestamp(); | |
c6eefa17 | 906 | } |
21a245d2 | 907 | e->pipe = crtc; |
c6eefa17 RC |
908 | send_vblank_event(dev, e, seq, &now); |
909 | } | |
910 | EXPORT_SYMBOL(drm_send_vblank_event); | |
911 | ||
f2752282 VS |
912 | /** |
913 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
914 | * @dev: DRM device | |
915 | * @crtc: CRTC in question | |
916 | */ | |
917 | static int drm_vblank_enable(struct drm_device *dev, int crtc) | |
918 | { | |
8a51d5be | 919 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f2752282 VS |
920 | int ret = 0; |
921 | ||
922 | assert_spin_locked(&dev->vbl_lock); | |
923 | ||
924 | spin_lock(&dev->vblank_time_lock); | |
925 | ||
8a51d5be | 926 | if (!vblank->enabled) { |
1cfb80b1 DV |
927 | /* |
928 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
929 | * All vblank count & timestamp updates are held off |
930 | * until we are done reinitializing master counter and | |
931 | * timestamps. Filtercode in drm_handle_vblank() will | |
932 | * prevent double-accounting of same vblank interval. | |
933 | */ | |
934 | ret = dev->driver->enable_vblank(dev, crtc); | |
935 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); | |
936 | if (ret) | |
8a51d5be | 937 | atomic_dec(&vblank->refcount); |
f2752282 | 938 | else { |
8a51d5be | 939 | vblank->enabled = true; |
f2752282 VS |
940 | drm_update_vblank_count(dev, crtc); |
941 | } | |
942 | } | |
943 | ||
944 | spin_unlock(&dev->vblank_time_lock); | |
945 | ||
946 | return ret; | |
947 | } | |
948 | ||
0a3e67a4 JB |
949 | /** |
950 | * drm_vblank_get - get a reference count on vblank events | |
951 | * @dev: DRM device | |
952 | * @crtc: which CRTC to own | |
953 | * | |
954 | * Acquire a reference count on vblank events to avoid having them disabled | |
955 | * while in use. | |
956 | * | |
89dd6a4b DV |
957 | * This is the legacy version of drm_crtc_vblank_get(). |
958 | * | |
f5752b38 | 959 | * Returns: |
0a3e67a4 JB |
960 | * Zero on success, nonzero on failure. |
961 | */ | |
962 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
963 | { | |
8a51d5be | 964 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
97cbc883 | 965 | unsigned long irqflags; |
0a3e67a4 JB |
966 | int ret = 0; |
967 | ||
968 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
969 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 970 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
f2752282 | 971 | ret = drm_vblank_enable(dev, crtc); |
778c9026 | 972 | } else { |
8a51d5be VS |
973 | if (!vblank->enabled) { |
974 | atomic_dec(&vblank->refcount); | |
778c9026 | 975 | ret = -EINVAL; |
0a3e67a4 JB |
976 | } |
977 | } | |
978 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
979 | ||
980 | return ret; | |
981 | } | |
982 | EXPORT_SYMBOL(drm_vblank_get); | |
983 | ||
89dd6a4b DV |
984 | /** |
985 | * drm_crtc_vblank_get - get a reference count on vblank events | |
986 | * @crtc: which CRTC to own | |
987 | * | |
988 | * Acquire a reference count on vblank events to avoid having them disabled | |
989 | * while in use. | |
990 | * | |
991 | * This is the native kms version of drm_vblank_off(). | |
992 | * | |
993 | * Returns: | |
994 | * Zero on success, nonzero on failure. | |
995 | */ | |
996 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
997 | { | |
998 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
999 | } | |
1000 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1001 | ||
0a3e67a4 JB |
1002 | /** |
1003 | * drm_vblank_put - give up ownership of vblank events | |
1004 | * @dev: DRM device | |
1005 | * @crtc: which counter to give up | |
1006 | * | |
1007 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 1008 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
1009 | * |
1010 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 JB |
1011 | */ |
1012 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
1013 | { | |
8a51d5be VS |
1014 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
1015 | ||
1016 | BUG_ON(atomic_read(&vblank->refcount) == 0); | |
b3f5e732 | 1017 | |
0a3e67a4 | 1018 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1019 | if (atomic_dec_and_test(&vblank->refcount)) { |
ab8905f1 DV |
1020 | if (drm_vblank_offdelay == 0) |
1021 | return; | |
1022 | else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) | |
4ed0ce3d | 1023 | vblank_disable_fn((unsigned long)vblank); |
ab8905f1 | 1024 | else |
4ed0ce3d VS |
1025 | mod_timer(&vblank->disable_timer, |
1026 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1027 | } | |
0a3e67a4 JB |
1028 | } |
1029 | EXPORT_SYMBOL(drm_vblank_put); | |
1030 | ||
89dd6a4b DV |
1031 | /** |
1032 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1033 | * @crtc: which counter to give up | |
1034 | * | |
1035 | * Release ownership of a given vblank counter, turning off interrupts | |
1036 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1037 | * | |
1038 | * This is the native kms version of drm_vblank_put(). | |
1039 | */ | |
1040 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1041 | { | |
1042 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1043 | } | |
1044 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1045 | ||
c6eefa17 RC |
1046 | /** |
1047 | * drm_vblank_off - disable vblank events on a CRTC | |
1048 | * @dev: DRM device | |
1049 | * @crtc: CRTC in question | |
1050 | * | |
f5752b38 DV |
1051 | * Drivers can use this function to shut down the vblank interrupt handling when |
1052 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1053 | * stored so that drm_vblank_on() can restore it again. | |
1054 | * | |
1055 | * Drivers must use this function when the hardware vblank counter can get | |
1056 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1057 | * |
1058 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1059 | */ |
778c9026 LP |
1060 | void drm_vblank_off(struct drm_device *dev, int crtc) |
1061 | { | |
8a51d5be | 1062 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
498548ec CJHR |
1063 | struct drm_pending_vblank_event *e, *t; |
1064 | struct timeval now; | |
778c9026 | 1065 | unsigned long irqflags; |
498548ec | 1066 | unsigned int seq; |
778c9026 | 1067 | |
56cc279b VS |
1068 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1069 | ||
1070 | spin_lock(&dev->vbl_lock); | |
27641c3f | 1071 | vblank_disable_and_save(dev, crtc); |
8a51d5be | 1072 | wake_up(&vblank->queue); |
498548ec | 1073 | |
56cc279b VS |
1074 | /* |
1075 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1076 | * the vblank interrupt by bumping the refcount. | |
1077 | */ | |
1078 | if (!vblank->inmodeset) { | |
1079 | atomic_inc(&vblank->refcount); | |
1080 | vblank->inmodeset = 1; | |
1081 | } | |
1082 | spin_unlock(&dev->vbl_lock); | |
1083 | ||
498548ec CJHR |
1084 | /* Send any queued vblank events, lest the natives grow disquiet */ |
1085 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
e7783ba3 | 1086 | |
498548ec CJHR |
1087 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
1088 | if (e->pipe != crtc) | |
1089 | continue; | |
1090 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
1091 | wanted %d, current %d\n", | |
1092 | e->event.sequence, seq); | |
c6eefa17 | 1093 | list_del(&e->base.link); |
498548ec | 1094 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1095 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1096 | } |
56cc279b | 1097 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 LP |
1098 | } |
1099 | EXPORT_SYMBOL(drm_vblank_off); | |
1100 | ||
89dd6a4b DV |
1101 | /** |
1102 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1103 | * @crtc: CRTC in question | |
1104 | * | |
1105 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1106 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1107 | * stored so that drm_vblank_on can restore it again. | |
1108 | * | |
1109 | * Drivers must use this function when the hardware vblank counter can get | |
1110 | * reset, e.g. when suspending. | |
1111 | * | |
1112 | * This is the native kms version of drm_vblank_off(). | |
1113 | */ | |
1114 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1115 | { | |
1116 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1117 | } | |
1118 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1119 | ||
f2752282 VS |
1120 | /** |
1121 | * drm_vblank_on - enable vblank events on a CRTC | |
1122 | * @dev: DRM device | |
1123 | * @crtc: CRTC in question | |
f5752b38 DV |
1124 | * |
1125 | * This functions restores the vblank interrupt state captured with | |
1126 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
1127 | * drm_vblank_off() can be unbalanced and so can also be unconditionaly called | |
1128 | * in driver load code to reflect the current hardware state of the crtc. | |
89dd6a4b DV |
1129 | * |
1130 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 VS |
1131 | */ |
1132 | void drm_vblank_on(struct drm_device *dev, int crtc) | |
1133 | { | |
8a51d5be | 1134 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f2752282 VS |
1135 | unsigned long irqflags; |
1136 | ||
1137 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
7ffd7a68 | 1138 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1139 | if (vblank->inmodeset) { |
1140 | atomic_dec(&vblank->refcount); | |
1141 | vblank->inmodeset = 0; | |
7ffd7a68 | 1142 | } |
f8ad028c VS |
1143 | |
1144 | /* | |
1145 | * sample the current counter to avoid random jumps | |
1146 | * when drm_vblank_enable() applies the diff | |
1147 | * | |
1148 | * -1 to make sure user will never see the same | |
1149 | * vblank counter value before and after a modeset | |
1150 | */ | |
8a51d5be | 1151 | vblank->last = |
f8ad028c VS |
1152 | (dev->driver->get_vblank_counter(dev, crtc) - 1) & |
1153 | dev->max_vblank_count; | |
cd19e52a VS |
1154 | /* |
1155 | * re-enable interrupts if there are users left, or the | |
1156 | * user wishes vblank interrupts to be enabled all the time. | |
1157 | */ | |
1158 | if (atomic_read(&vblank->refcount) != 0 || | |
1159 | (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0)) | |
f2752282 VS |
1160 | WARN_ON(drm_vblank_enable(dev, crtc)); |
1161 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1162 | } | |
1163 | EXPORT_SYMBOL(drm_vblank_on); | |
1164 | ||
89dd6a4b DV |
1165 | /** |
1166 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1167 | * @crtc: CRTC in question | |
1168 | * | |
1169 | * This functions restores the vblank interrupt state captured with | |
1170 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
1171 | * drm_vblank_off() can be unbalanced and so can also be unconditionaly called | |
1172 | * in driver load code to reflect the current hardware state of the crtc. | |
1173 | * | |
1174 | * This is the native kms version of drm_vblank_on(). | |
1175 | */ | |
1176 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1177 | { | |
1178 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1179 | } | |
1180 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1181 | ||
f453ba04 DA |
1182 | /** |
1183 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1184 | * @dev: DRM device | |
1185 | * @crtc: CRTC in question | |
f453ba04 DA |
1186 | * |
1187 | * Account for vblank events across mode setting events, which will likely | |
1188 | * reset the hardware frame counter. | |
f5752b38 DV |
1189 | * |
1190 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1191 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1192 | * software-side vblank frame counting will ensure that there are no jumps or | |
1193 | * discontinuities. | |
1194 | * | |
1195 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1196 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1197 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1198 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1199 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1200 | * counters. | |
1201 | * | |
1202 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1203 | * again. | |
f453ba04 DA |
1204 | */ |
1205 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
1206 | { | |
8a51d5be VS |
1207 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
1208 | ||
b7ea85a4 | 1209 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1210 | if (!dev->num_crtcs) |
1211 | return; | |
f453ba04 DA |
1212 | /* |
1213 | * To avoid all the problems that might happen if interrupts | |
1214 | * were enabled/disabled around or between these calls, we just | |
1215 | * have the kernel take a reference on the CRTC (just once though | |
1216 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1217 | * so that interrupts remain enabled in the interim. | |
1218 | */ | |
8a51d5be VS |
1219 | if (!vblank->inmodeset) { |
1220 | vblank->inmodeset = 0x1; | |
b3f5e732 | 1221 | if (drm_vblank_get(dev, crtc) == 0) |
8a51d5be | 1222 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1223 | } |
1224 | } | |
1225 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1226 | ||
f5752b38 DV |
1227 | /** |
1228 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1229 | * @dev: DRM device | |
1230 | * @crtc: CRTC in question | |
1231 | * | |
1232 | * This function again drops the temporary vblank reference acquired in | |
1233 | * drm_vblank_pre_modeset. | |
1234 | */ | |
f453ba04 DA |
1235 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) |
1236 | { | |
8a51d5be | 1237 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f453ba04 DA |
1238 | unsigned long irqflags; |
1239 | ||
b7ea85a4 HC |
1240 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1241 | if (!dev->num_crtcs) | |
1242 | return; | |
1243 | ||
8a51d5be | 1244 | if (vblank->inmodeset) { |
f453ba04 | 1245 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
ba0bf120 | 1246 | dev->vblank_disable_allowed = true; |
f453ba04 | 1247 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1248 | |
8a51d5be | 1249 | if (vblank->inmodeset & 0x2) |
b3f5e732 CW |
1250 | drm_vblank_put(dev, crtc); |
1251 | ||
8a51d5be | 1252 | vblank->inmodeset = 0; |
f453ba04 DA |
1253 | } |
1254 | } | |
1255 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1256 | ||
f5752b38 | 1257 | /* |
0a3e67a4 JB |
1258 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1259 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1260 | * | |
1261 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1262 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1263 | * | |
1264 | * Generally the counter will reset across mode sets. If interrupts are | |
1265 | * enabled around this call, we don't have to do anything since the counter | |
1266 | * will have already been incremented. | |
1267 | */ | |
1268 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1269 | struct drm_file *file_priv) | |
1270 | { | |
1271 | struct drm_modeset_ctl *modeset = data; | |
19227561 | 1272 | unsigned int crtc; |
0a3e67a4 JB |
1273 | |
1274 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1275 | if (!dev->num_crtcs) | |
4a1b0714 | 1276 | return 0; |
0a3e67a4 | 1277 | |
29935554 LP |
1278 | /* KMS drivers handle this internally */ |
1279 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1280 | return 0; | |
1281 | ||
0a3e67a4 | 1282 | crtc = modeset->crtc; |
4a1b0714 LP |
1283 | if (crtc >= dev->num_crtcs) |
1284 | return -EINVAL; | |
0a3e67a4 | 1285 | |
0a3e67a4 JB |
1286 | switch (modeset->cmd) { |
1287 | case _DRM_PRE_MODESET: | |
f453ba04 | 1288 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1289 | break; |
1290 | case _DRM_POST_MODESET: | |
f453ba04 | 1291 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1292 | break; |
1293 | default: | |
4a1b0714 | 1294 | return -EINVAL; |
0a3e67a4 JB |
1295 | } |
1296 | ||
4a1b0714 | 1297 | return 0; |
0a3e67a4 JB |
1298 | } |
1299 | ||
c9a9c5e0 KH |
1300 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1301 | union drm_wait_vblank *vblwait, | |
1302 | struct drm_file *file_priv) | |
1303 | { | |
ffe7c73a | 1304 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1305 | struct drm_pending_vblank_event *e; |
1306 | struct timeval now; | |
1307 | unsigned long flags; | |
1308 | unsigned int seq; | |
ea5d552c | 1309 | int ret; |
c9a9c5e0 KH |
1310 | |
1311 | e = kzalloc(sizeof *e, GFP_KERNEL); | |
ea5d552c CW |
1312 | if (e == NULL) { |
1313 | ret = -ENOMEM; | |
1314 | goto err_put; | |
1315 | } | |
c9a9c5e0 KH |
1316 | |
1317 | e->pipe = pipe; | |
b9c2c9ae | 1318 | e->base.pid = current->pid; |
c9a9c5e0 KH |
1319 | e->event.base.type = DRM_EVENT_VBLANK; |
1320 | e->event.base.length = sizeof e->event; | |
1321 | e->event.user_data = vblwait->request.signal; | |
1322 | e->base.event = &e->event.base; | |
1323 | e->base.file_priv = file_priv; | |
1324 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1325 | ||
c9a9c5e0 KH |
1326 | spin_lock_irqsave(&dev->event_lock, flags); |
1327 | ||
ffe7c73a VS |
1328 | /* |
1329 | * drm_vblank_off() might have been called after we called | |
1330 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1331 | * around the vblank disable, so no need for further locking. | |
1332 | * The reference from drm_vblank_get() protects against | |
1333 | * vblank disable from another source. | |
1334 | */ | |
1335 | if (!vblank->enabled) { | |
1336 | ret = -EINVAL; | |
1337 | goto err_unlock; | |
1338 | } | |
1339 | ||
c9a9c5e0 | 1340 | if (file_priv->event_space < sizeof e->event) { |
ea5d552c CW |
1341 | ret = -EBUSY; |
1342 | goto err_unlock; | |
c9a9c5e0 KH |
1343 | } |
1344 | ||
1345 | file_priv->event_space -= sizeof e->event; | |
27641c3f MK |
1346 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1347 | ||
c9a9c5e0 KH |
1348 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1349 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1350 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1351 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1352 | } |
1353 | ||
1354 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1355 | vblwait->request.sequence, seq, pipe); | |
1356 | ||
b9c2c9ae JB |
1357 | trace_drm_vblank_event_queued(current->pid, pipe, |
1358 | vblwait->request.sequence); | |
1359 | ||
c9a9c5e0 KH |
1360 | e->event.sequence = vblwait->request.sequence; |
1361 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1362 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1363 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1364 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1365 | } else { |
a6778e9e | 1366 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1367 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1368 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1369 | } |
1370 | ||
1371 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1372 | ||
1373 | return 0; | |
ea5d552c CW |
1374 | |
1375 | err_unlock: | |
1376 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1377 | kfree(e); | |
1378 | err_put: | |
6f331623 | 1379 | drm_vblank_put(dev, pipe); |
ea5d552c | 1380 | return ret; |
c9a9c5e0 KH |
1381 | } |
1382 | ||
f5752b38 | 1383 | /* |
1da177e4 LT |
1384 | * Wait for VBLANK. |
1385 | * | |
1386 | * \param inode device inode. | |
6c340eac | 1387 | * \param file_priv DRM file private. |
1da177e4 LT |
1388 | * \param cmd command. |
1389 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1390 | * \return zero on success or a negative number on failure. | |
1391 | * | |
30b23634 EA |
1392 | * This function enables the vblank interrupt on the pipe requested, then |
1393 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1394 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1395 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1396 | */ |
0a3e67a4 JB |
1397 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1398 | struct drm_file *file_priv) | |
1da177e4 | 1399 | { |
8a51d5be | 1400 | struct drm_vblank_crtc *vblank; |
c153f45f | 1401 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1402 | int ret; |
19b01b5f | 1403 | unsigned int flags, seq, crtc, high_crtc; |
1da177e4 | 1404 | |
4984979b DV |
1405 | if (!dev->irq_enabled) |
1406 | return -EINVAL; | |
1da177e4 | 1407 | |
30b23634 EA |
1408 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1409 | return -EINVAL; | |
1410 | ||
c153f45f | 1411 | if (vblwait->request.type & |
19b01b5f IH |
1412 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1413 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1414 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1415 | vblwait->request.type, |
19b01b5f IH |
1416 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1417 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MCA |
1418 | return -EINVAL; |
1419 | } | |
1420 | ||
c153f45f | 1421 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
19b01b5f IH |
1422 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1423 | if (high_crtc) | |
1424 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1425 | else | |
1426 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
0a3e67a4 | 1427 | if (crtc >= dev->num_crtcs) |
776c9443 MCA |
1428 | return -EINVAL; |
1429 | ||
8a51d5be VS |
1430 | vblank = &dev->vblank[crtc]; |
1431 | ||
0a3e67a4 JB |
1432 | ret = drm_vblank_get(dev, crtc); |
1433 | if (ret) { | |
8d3457ec | 1434 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1435 | return ret; |
1436 | } | |
1437 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1438 | |
c153f45f | 1439 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1440 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1441 | vblwait->request.sequence += seq; |
1442 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1443 | case _DRM_VBLANK_ABSOLUTE: |
1444 | break; | |
1445 | default: | |
0a3e67a4 JB |
1446 | ret = -EINVAL; |
1447 | goto done; | |
1da177e4 LT |
1448 | } |
1449 | ||
a6778e9e IH |
1450 | if (flags & _DRM_VBLANK_EVENT) { |
1451 | /* must hold on to the vblank ref until the event fires | |
1452 | * drm_vblank_put will be called asynchronously | |
1453 | */ | |
c9a9c5e0 | 1454 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); |
a6778e9e | 1455 | } |
c9a9c5e0 | 1456 | |
ab285d74 | 1457 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1458 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1459 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
1460 | } |
1461 | ||
30b23634 EA |
1462 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1463 | vblwait->request.sequence, crtc); | |
8a51d5be VS |
1464 | vblank->last_wait = vblwait->request.sequence; |
1465 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
30b23634 EA |
1466 | (((drm_vblank_count(dev, crtc) - |
1467 | vblwait->request.sequence) <= (1 << 23)) || | |
8a51d5be | 1468 | !vblank->enabled || |
30b23634 | 1469 | !dev->irq_enabled)); |
1da177e4 | 1470 | |
30b23634 EA |
1471 | if (ret != -EINTR) { |
1472 | struct timeval now; | |
1da177e4 | 1473 | |
27641c3f | 1474 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1475 | vblwait->reply.tval_sec = now.tv_sec; |
1476 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1477 | |
30b23634 EA |
1478 | DRM_DEBUG("returning %d to client\n", |
1479 | vblwait->reply.sequence); | |
1da177e4 | 1480 | } else { |
30b23634 | 1481 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1482 | } |
1483 | ||
0a3e67a4 JB |
1484 | done: |
1485 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1486 | return ret; |
1487 | } | |
1488 | ||
ea7f7abc | 1489 | static void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
c9a9c5e0 KH |
1490 | { |
1491 | struct drm_pending_vblank_event *e, *t; | |
1492 | struct timeval now; | |
c9a9c5e0 KH |
1493 | unsigned int seq; |
1494 | ||
56cc279b | 1495 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1496 | |
56cc279b | 1497 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1498 | |
1499 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1500 | if (e->pipe != crtc) | |
1501 | continue; | |
1502 | if ((seq - e->event.sequence) > (1<<23)) | |
1503 | continue; | |
1504 | ||
1505 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1506 | e->event.sequence, seq); | |
1507 | ||
c6eefa17 | 1508 | list_del(&e->base.link); |
c9a9c5e0 | 1509 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1510 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1511 | } |
1512 | ||
ac2874b9 | 1513 | trace_drm_vblank_event(crtc, seq); |
c9a9c5e0 KH |
1514 | } |
1515 | ||
0a3e67a4 JB |
1516 | /** |
1517 | * drm_handle_vblank - handle a vblank event | |
1518 | * @dev: DRM device | |
1519 | * @crtc: where this event occurred | |
1520 | * | |
1521 | * Drivers should call this routine in their vblank interrupt handlers to | |
1522 | * update the vblank counter and send any signals that may be pending. | |
1523 | */ | |
78c6e170 | 1524 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1525 | { |
8a51d5be | 1526 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
1527 | u32 vblcount; |
1528 | s64 diff_ns; | |
1529 | struct timeval tvblank; | |
1530 | unsigned long irqflags; | |
1531 | ||
c9a9c5e0 | 1532 | if (!dev->num_crtcs) |
78c6e170 | 1533 | return false; |
c9a9c5e0 | 1534 | |
56cc279b VS |
1535 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1536 | ||
27641c3f MK |
1537 | /* Need timestamp lock to prevent concurrent execution with |
1538 | * vblank enable/disable, as this would cause inconsistent | |
1539 | * or corrupted timestamps and vblank counts. | |
1540 | */ | |
56cc279b | 1541 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1542 | |
1543 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1544 | if (!vblank->enabled) { |
56cc279b VS |
1545 | spin_unlock(&dev->vblank_time_lock); |
1546 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1547 | return false; |
27641c3f MK |
1548 | } |
1549 | ||
1550 | /* Fetch corresponding timestamp for this vblank interval from | |
1551 | * driver and store it in proper slot of timestamp ringbuffer. | |
1552 | */ | |
1553 | ||
1554 | /* Get current timestamp and count. */ | |
8a51d5be | 1555 | vblcount = atomic_read(&vblank->count); |
27641c3f MK |
1556 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); |
1557 | ||
1558 | /* Compute time difference to timestamp of last vblank */ | |
1559 | diff_ns = timeval_to_ns(&tvblank) - | |
1560 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1561 | ||
1562 | /* Update vblank timestamp and count if at least | |
1563 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1564 | * difference between last stored timestamp and current | |
1565 | * timestamp. A smaller difference means basically | |
1566 | * identical timestamps. Happens if this vblank has | |
1567 | * been already processed and this is a redundant call, | |
1568 | * e.g., due to spurious vblank interrupts. We need to | |
1569 | * ignore those for accounting. | |
1570 | */ | |
c4cc3839 | 1571 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { |
27641c3f MK |
1572 | /* Store new timestamp in ringbuffer. */ |
1573 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
27641c3f MK |
1574 | |
1575 | /* Increment cooked vblank count. This also atomically commits | |
1576 | * the timestamp computed above. | |
1577 | */ | |
4e857c58 | 1578 | smp_mb__before_atomic(); |
8a51d5be | 1579 | atomic_inc(&vblank->count); |
4e857c58 | 1580 | smp_mb__after_atomic(); |
27641c3f MK |
1581 | } else { |
1582 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", | |
1583 | crtc, (int) diff_ns); | |
1584 | } | |
1585 | ||
56cc279b VS |
1586 | spin_unlock(&dev->vblank_time_lock); |
1587 | ||
8a51d5be | 1588 | wake_up(&vblank->queue); |
c9a9c5e0 | 1589 | drm_handle_vblank_events(dev, crtc); |
27641c3f | 1590 | |
56cc279b VS |
1591 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1592 | ||
78c6e170 | 1593 | return true; |
0a3e67a4 JB |
1594 | } |
1595 | EXPORT_SYMBOL(drm_handle_vblank); |