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 | ||
13b030af VS |
77 | /** |
78 | * drm_update_vblank_count - update the master vblank counter | |
79 | * @dev: DRM device | |
80 | * @crtc: counter to update | |
81 | * | |
82 | * Call back into the driver to update the appropriate vblank counter | |
83 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
84 | * update the last read value so we can deal with wraparound on the next | |
85 | * call if necessary. | |
86 | * | |
87 | * Only necessary when going from off->on, to account for frames we | |
88 | * didn't get an interrupt for. | |
89 | * | |
90 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
91 | * device vblank fields. | |
92 | */ | |
93 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
94 | { | |
8a51d5be | 95 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
fb446a1a DV |
96 | u32 cur_vblank, diff, tslot; |
97 | bool rc; | |
13b030af VS |
98 | struct timeval t_vblank; |
99 | ||
100 | /* | |
101 | * Interrupts were disabled prior to this call, so deal with counter | |
102 | * wrap if needed. | |
103 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
104 | * here if the register is small or we had vblank interrupts off for | |
105 | * a long time. | |
106 | * | |
107 | * We repeat the hardware vblank counter & timestamp query until | |
108 | * we get consistent results. This to prevent races between gpu | |
109 | * updating its hardware counter while we are retrieving the | |
110 | * corresponding vblank timestamp. | |
111 | */ | |
112 | do { | |
113 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
114 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
115 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
116 | ||
117 | /* Deal with counter wrap */ | |
8a51d5be VS |
118 | diff = cur_vblank - vblank->last; |
119 | if (cur_vblank < vblank->last) { | |
13b030af VS |
120 | diff += dev->max_vblank_count; |
121 | ||
122 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
8a51d5be | 123 | crtc, vblank->last, cur_vblank, diff); |
13b030af VS |
124 | } |
125 | ||
96a9fdd7 | 126 | DRM_DEBUG("updating vblank count on crtc %d, missed %d\n", |
13b030af VS |
127 | crtc, diff); |
128 | ||
129 | /* Reinitialize corresponding vblank timestamp if high-precision query | |
130 | * available. Skip this step if query unsupported or failed. Will | |
131 | * reinitialize delayed at next vblank interrupt in that case. | |
132 | */ | |
133 | if (rc) { | |
8a51d5be | 134 | tslot = atomic_read(&vblank->count) + diff; |
13b030af VS |
135 | vblanktimestamp(dev, crtc, tslot) = t_vblank; |
136 | } | |
137 | ||
138 | smp_mb__before_atomic(); | |
8a51d5be | 139 | atomic_add(diff, &vblank->count); |
13b030af VS |
140 | smp_mb__after_atomic(); |
141 | } | |
142 | ||
27641c3f MK |
143 | /* |
144 | * Disable vblank irq's on crtc, make sure that last vblank count | |
145 | * of hardware and corresponding consistent software vblank counter | |
146 | * are preserved, even if there are any spurious vblank irq's after | |
147 | * disable. | |
148 | */ | |
149 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
150 | { | |
8a51d5be | 151 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
152 | unsigned long irqflags; |
153 | u32 vblcount; | |
154 | s64 diff_ns; | |
fb446a1a | 155 | bool vblrc; |
27641c3f | 156 | struct timeval tvblank; |
0355cf3a | 157 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
158 | |
159 | /* Prevent vblank irq processing while disabling vblank irqs, | |
160 | * so no updates of timestamps or count can happen after we've | |
161 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 162 | */ |
27641c3f MK |
163 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
164 | ||
812e7465 VS |
165 | /* |
166 | * If the vblank interrupt was already disbled update the count | |
167 | * and timestamp to maintain the appearance that the counter | |
168 | * has been ticking all along until this time. This makes the | |
169 | * count account for the entire time between drm_vblank_on() and | |
170 | * drm_vblank_off(). | |
855d30b4 DV |
171 | * |
172 | * But only do this if precise vblank timestamps are available. | |
173 | * Otherwise we might read a totally bogus timestamp since drivers | |
174 | * lacking precise timestamp support rely upon sampling the system clock | |
175 | * at vblank interrupt time. Which obviously won't work out well if the | |
176 | * vblank interrupt is disabled. | |
812e7465 | 177 | */ |
855d30b4 | 178 | if (!vblank->enabled && |
fb446a1a | 179 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0)) { |
812e7465 VS |
180 | drm_update_vblank_count(dev, crtc); |
181 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
182 | return; | |
183 | } | |
184 | ||
27641c3f | 185 | dev->driver->disable_vblank(dev, crtc); |
8a51d5be | 186 | vblank->enabled = false; |
27641c3f MK |
187 | |
188 | /* No further vblank irq's will be processed after | |
189 | * this point. Get current hardware vblank count and | |
190 | * vblank timestamp, repeat until they are consistent. | |
191 | * | |
192 | * FIXME: There is still a race condition here and in | |
193 | * drm_update_vblank_count() which can cause off-by-one | |
194 | * reinitialization of software vblank counter. If gpu | |
195 | * vblank counter doesn't increment exactly at the leading | |
196 | * edge of a vblank interval, then we can lose 1 count if | |
197 | * we happen to execute between start of vblank and the | |
198 | * delayed gpu counter increment. | |
199 | */ | |
200 | do { | |
8a51d5be | 201 | vblank->last = dev->driver->get_vblank_counter(dev, crtc); |
27641c3f | 202 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); |
8a51d5be | 203 | } while (vblank->last != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc); |
0355cf3a EE |
204 | |
205 | if (!count) | |
206 | vblrc = 0; | |
27641c3f MK |
207 | |
208 | /* Compute time difference to stored timestamp of last vblank | |
209 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
210 | */ | |
8a51d5be | 211 | vblcount = atomic_read(&vblank->count); |
27641c3f MK |
212 | diff_ns = timeval_to_ns(&tvblank) - |
213 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
214 | ||
215 | /* If there is at least 1 msec difference between the last stored | |
216 | * timestamp and tvblank, then we are currently executing our | |
217 | * disable inside a new vblank interval, the tvblank timestamp | |
218 | * corresponds to this new vblank interval and the irq handler | |
219 | * for this vblank didn't run yet and won't run due to our disable. | |
220 | * Therefore we need to do the job of drm_handle_vblank() and | |
221 | * increment the vblank counter by one to account for this vblank. | |
222 | * | |
223 | * Skip this step if there isn't any high precision timestamp | |
224 | * available. In that case we can't account for this and just | |
225 | * hope for the best. | |
226 | */ | |
fb446a1a | 227 | if (vblrc && (abs64(diff_ns) > 1000000)) { |
c50d7521 VS |
228 | /* Store new timestamp in ringbuffer. */ |
229 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
230 | ||
231 | /* Increment cooked vblank count. This also atomically commits | |
232 | * the timestamp computed above. | |
233 | */ | |
234 | smp_mb__before_atomic(); | |
8a51d5be | 235 | atomic_inc(&vblank->count); |
4e857c58 | 236 | smp_mb__after_atomic(); |
bc215128 | 237 | } |
27641c3f | 238 | |
27641c3f | 239 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
240 | } |
241 | ||
0a3e67a4 JB |
242 | static void vblank_disable_fn(unsigned long arg) |
243 | { | |
e69595c2 VS |
244 | struct drm_vblank_crtc *vblank = (void *)arg; |
245 | struct drm_device *dev = vblank->dev; | |
0a3e67a4 | 246 | unsigned long irqflags; |
e69595c2 | 247 | int crtc = vblank->crtc; |
0a3e67a4 JB |
248 | |
249 | if (!dev->vblank_disable_allowed) | |
250 | return; | |
251 | ||
e69595c2 VS |
252 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
253 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
254 | DRM_DEBUG("disabling vblank on crtc %d\n", crtc); | |
255 | vblank_disable_and_save(dev, crtc); | |
0a3e67a4 | 256 | } |
e69595c2 | 257 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
258 | } |
259 | ||
f5752b38 DV |
260 | /** |
261 | * drm_vblank_cleanup - cleanup vblank support | |
262 | * @dev: DRM device | |
263 | * | |
264 | * This function cleans up any resources allocated in drm_vblank_init. | |
265 | */ | |
52440211 | 266 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 267 | { |
e69595c2 | 268 | int crtc; |
2368ffb1 | 269 | unsigned long irqflags; |
e69595c2 | 270 | |
0a3e67a4 JB |
271 | /* Bail if the driver didn't call drm_vblank_init() */ |
272 | if (dev->num_crtcs == 0) | |
273 | return; | |
274 | ||
e69595c2 | 275 | for (crtc = 0; crtc < dev->num_crtcs; crtc++) { |
8a51d5be VS |
276 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
277 | ||
278 | del_timer_sync(&vblank->disable_timer); | |
2368ffb1 MK |
279 | |
280 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
281 | vblank_disable_and_save(dev, crtc); | |
282 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
e69595c2 | 283 | } |
0a3e67a4 | 284 | |
5380e929 | 285 | kfree(dev->vblank); |
0a3e67a4 JB |
286 | |
287 | dev->num_crtcs = 0; | |
288 | } | |
e77cef9c | 289 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 290 | |
f5752b38 DV |
291 | /** |
292 | * drm_vblank_init - initialize vblank support | |
293 | * @dev: drm_device | |
294 | * @num_crtcs: number of crtcs supported by @dev | |
295 | * | |
296 | * This function initializes vblank support for @num_crtcs display pipelines. | |
297 | * | |
298 | * Returns: | |
299 | * Zero on success or a negative error code on failure. | |
300 | */ | |
0a3e67a4 JB |
301 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) |
302 | { | |
303 | int i, ret = -ENOMEM; | |
304 | ||
0a3e67a4 | 305 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
306 | spin_lock_init(&dev->vblank_time_lock); |
307 | ||
0a3e67a4 JB |
308 | dev->num_crtcs = num_crtcs; |
309 | ||
5380e929 VS |
310 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
311 | if (!dev->vblank) | |
0a3e67a4 JB |
312 | goto err; |
313 | ||
e69595c2 | 314 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
315 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
316 | ||
317 | vblank->dev = dev; | |
318 | vblank->crtc = i; | |
319 | init_waitqueue_head(&vblank->queue); | |
320 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
321 | (unsigned long)vblank); | |
e69595c2 | 322 | } |
27641c3f | 323 | |
8f6fce03 | 324 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
325 | |
326 | /* Driver specific high-precision vblank timestamping supported? */ | |
327 | if (dev->driver->get_vblank_timestamp) | |
328 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
329 | else | |
330 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
331 | ||
ba0bf120 VS |
332 | dev->vblank_disable_allowed = false; |
333 | ||
0a3e67a4 JB |
334 | return 0; |
335 | ||
336 | err: | |
79a093ae | 337 | dev->num_crtcs = 0; |
0a3e67a4 JB |
338 | return ret; |
339 | } | |
340 | EXPORT_SYMBOL(drm_vblank_init); | |
341 | ||
28d52043 DA |
342 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
343 | { | |
344 | struct drm_device *dev = cookie; | |
345 | ||
346 | if (dev->driver->vgaarb_irq) { | |
347 | dev->driver->vgaarb_irq(dev, state); | |
348 | return; | |
349 | } | |
350 | ||
351 | if (!dev->irq_enabled) | |
352 | return; | |
353 | ||
5037f8ac JS |
354 | if (state) { |
355 | if (dev->driver->irq_uninstall) | |
356 | dev->driver->irq_uninstall(dev); | |
357 | } else { | |
358 | if (dev->driver->irq_preinstall) | |
359 | dev->driver->irq_preinstall(dev); | |
360 | if (dev->driver->irq_postinstall) | |
361 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
362 | } |
363 | } | |
364 | ||
1da177e4 | 365 | /** |
f5752b38 DV |
366 | * drm_irq_install - install IRQ handler |
367 | * @dev: DRM device | |
368 | * @irq: IRQ number to install the handler for | |
1da177e4 | 369 | * |
0a3e67a4 | 370 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
371 | * irq_preinstall() and irq_postinstall() functions before and after the |
372 | * installation. | |
373 | * | |
374 | * This is the simplified helper interface provided for drivers with no special | |
375 | * needs. Drivers which need to install interrupt handlers for multiple | |
376 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
377 | * that vblank interrupts are available. | |
378 | * | |
379 | * Returns: | |
380 | * Zero on success or a negative error code on failure. | |
1da177e4 | 381 | */ |
bb0f1b5c | 382 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 383 | { |
4a1b0714 | 384 | int ret; |
b5e89ed5 | 385 | unsigned long sh_flags = 0; |
1da177e4 LT |
386 | |
387 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
388 | return -EINVAL; | |
389 | ||
7c1a38e3 | 390 | if (irq == 0) |
1da177e4 LT |
391 | return -EINVAL; |
392 | ||
1da177e4 | 393 | /* Driver must have been initialized */ |
e090c53b | 394 | if (!dev->dev_private) |
1da177e4 | 395 | return -EINVAL; |
1da177e4 | 396 | |
e090c53b | 397 | if (dev->irq_enabled) |
1da177e4 | 398 | return -EBUSY; |
4423843c | 399 | dev->irq_enabled = true; |
1da177e4 | 400 | |
7c1a38e3 | 401 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 402 | |
b5e89ed5 | 403 | /* Before installing handler */ |
5037f8ac JS |
404 | if (dev->driver->irq_preinstall) |
405 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 406 | |
b5e89ed5 | 407 | /* Install handler */ |
1da177e4 | 408 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 409 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 410 | |
7c1a38e3 | 411 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 412 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 413 | |
b5e89ed5 | 414 | if (ret < 0) { |
4423843c | 415 | dev->irq_enabled = false; |
1da177e4 LT |
416 | return ret; |
417 | } | |
418 | ||
28d52043 DA |
419 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
420 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
421 | ||
b5e89ed5 | 422 | /* After installing handler */ |
5037f8ac JS |
423 | if (dev->driver->irq_postinstall) |
424 | ret = dev->driver->irq_postinstall(dev); | |
425 | ||
0a3e67a4 | 426 | if (ret < 0) { |
4423843c | 427 | dev->irq_enabled = false; |
e1c44acc JS |
428 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
429 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
7c1a38e3 DV |
430 | free_irq(irq, dev); |
431 | } else { | |
432 | dev->irq = irq; | |
0a3e67a4 | 433 | } |
1da177e4 | 434 | |
0a3e67a4 | 435 | return ret; |
1da177e4 | 436 | } |
0a3e67a4 | 437 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
438 | |
439 | /** | |
f5752b38 DV |
440 | * drm_irq_uninstall - uninstall the IRQ handler |
441 | * @dev: DRM device | |
442 | * | |
443 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
444 | * This should only be called by drivers which used drm_irq_install() to set up | |
445 | * their interrupt handler. Other drivers must only reset | |
446 | * drm_device->irq_enabled to false. | |
1da177e4 | 447 | * |
f5752b38 DV |
448 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
449 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
450 | * the same function through an ioctl. | |
1da177e4 | 451 | * |
f5752b38 DV |
452 | * Returns: |
453 | * Zero on success or a negative error code on failure. | |
1da177e4 | 454 | */ |
27641c3f | 455 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 456 | { |
dc1336ff | 457 | unsigned long irqflags; |
4423843c VS |
458 | bool irq_enabled; |
459 | int i; | |
1da177e4 LT |
460 | |
461 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
462 | return -EINVAL; | |
463 | ||
1da177e4 | 464 | irq_enabled = dev->irq_enabled; |
4423843c | 465 | dev->irq_enabled = false; |
1da177e4 | 466 | |
dc1336ff JB |
467 | /* |
468 | * Wake up any waiters so they don't hang. | |
469 | */ | |
bde4889a BS |
470 | if (dev->num_crtcs) { |
471 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
472 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
473 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
474 | ||
475 | wake_up(&vblank->queue); | |
476 | vblank->enabled = false; | |
477 | vblank->last = | |
bde4889a BS |
478 | dev->driver->get_vblank_counter(dev, i); |
479 | } | |
480 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 481 | } |
dc1336ff | 482 | |
b5e89ed5 | 483 | if (!irq_enabled) |
1da177e4 LT |
484 | return -EINVAL; |
485 | ||
7c1a38e3 | 486 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 487 | |
28d52043 DA |
488 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
489 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
490 | ||
5037f8ac JS |
491 | if (dev->driver->irq_uninstall) |
492 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 493 | |
7c1a38e3 | 494 | free_irq(dev->irq, dev); |
1da177e4 LT |
495 | |
496 | return 0; | |
497 | } | |
498 | EXPORT_SYMBOL(drm_irq_uninstall); | |
499 | ||
f5752b38 | 500 | /* |
1da177e4 LT |
501 | * IRQ control ioctl. |
502 | * | |
503 | * \param inode device inode. | |
6c340eac | 504 | * \param file_priv DRM file private. |
1da177e4 LT |
505 | * \param cmd command. |
506 | * \param arg user argument, pointing to a drm_control structure. | |
507 | * \return zero on success or a negative number on failure. | |
508 | * | |
509 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
510 | */ | |
c153f45f EA |
511 | int drm_control(struct drm_device *dev, void *data, |
512 | struct drm_file *file_priv) | |
1da177e4 | 513 | { |
c153f45f | 514 | struct drm_control *ctl = data; |
a319c1a4 | 515 | int ret = 0, irq; |
b5e89ed5 | 516 | |
27641c3f MK |
517 | /* if we haven't irq we fallback for compatibility reasons - |
518 | * this used to be a separate function in drm_dma.h | |
519 | */ | |
1da177e4 | 520 | |
22471cf6 DV |
521 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
522 | return 0; | |
523 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
524 | return 0; | |
525 | /* UMS was only ever support on pci devices. */ | |
526 | if (WARN_ON(!dev->pdev)) | |
527 | return -EINVAL; | |
1da177e4 | 528 | |
c153f45f | 529 | switch (ctl->func) { |
1da177e4 | 530 | case DRM_INST_HANDLER: |
a319c1a4 DV |
531 | irq = dev->pdev->irq; |
532 | ||
1da177e4 | 533 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 534 | ctl->irq != irq) |
1da177e4 | 535 | return -EINVAL; |
e090c53b | 536 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 537 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
538 | mutex_unlock(&dev->struct_mutex); |
539 | ||
540 | return ret; | |
1da177e4 | 541 | case DRM_UNINST_HANDLER: |
e090c53b DV |
542 | mutex_lock(&dev->struct_mutex); |
543 | ret = drm_irq_uninstall(dev); | |
544 | mutex_unlock(&dev->struct_mutex); | |
545 | ||
546 | return ret; | |
1da177e4 LT |
547 | default: |
548 | return -EINVAL; | |
549 | } | |
550 | } | |
551 | ||
27641c3f | 552 | /** |
f5752b38 DV |
553 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
554 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
555 | * @mode: display mode containing the scanout timings | |
27641c3f | 556 | * |
21b21560 VS |
557 | * Calculate and store various constants which are later |
558 | * needed by vblank and swap-completion timestamping, e.g, | |
559 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 560 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 561 | * things like panel scaling or other adjustments into account. |
27641c3f | 562 | */ |
545cdd55 VS |
563 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
564 | const struct drm_display_mode *mode) | |
27641c3f | 565 | { |
3c184f69 | 566 | int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; |
77666b72 | 567 | int dotclock = mode->crtc_clock; |
27641c3f MK |
568 | |
569 | /* Valid dotclock? */ | |
570 | if (dotclock > 0) { | |
0dae35a3 VS |
571 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
572 | ||
573 | /* | |
574 | * Convert scanline length in pixels and video | |
575 | * dot clock to line duration, frame duration | |
576 | * and pixel duration in nanoseconds: | |
27641c3f | 577 | */ |
0dae35a3 VS |
578 | pixeldur_ns = 1000000 / dotclock; |
579 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
580 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
581 | |
582 | /* | |
583 | * Fields of interlaced scanout modes are only half a frame duration. | |
584 | */ | |
585 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
586 | framedur_ns /= 2; | |
27641c3f MK |
587 | } else |
588 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", | |
589 | crtc->base.id); | |
590 | ||
591 | crtc->pixeldur_ns = pixeldur_ns; | |
592 | crtc->linedur_ns = linedur_ns; | |
593 | crtc->framedur_ns = framedur_ns; | |
594 | ||
595 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
545cdd55 VS |
596 | crtc->base.id, mode->crtc_htotal, |
597 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
27641c3f | 598 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", |
3c184f69 VS |
599 | crtc->base.id, dotclock, framedur_ns, |
600 | linedur_ns, pixeldur_ns); | |
27641c3f MK |
601 | } |
602 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
603 | ||
604 | /** | |
f5752b38 DV |
605 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
606 | * @dev: DRM device | |
607 | * @crtc: Which CRTC's vblank timestamp to retrieve | |
608 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
609 | * On return contains true maximum error of timestamp | |
610 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
611 | * @flags: Flags to pass to driver: | |
612 | * 0 = Default, | |
613 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
614 | * @refcrtc: CRTC which defines scanout timing | |
615 | * @mode: mode which defines the scanout timings | |
616 | * | |
617 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
618 | * timings and current video scanout position of a CRTC. This can be called from | |
619 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
620 | * actual timestamping. | |
27641c3f MK |
621 | * |
622 | * Should return timestamps conforming to the OML_sync_control OpenML | |
623 | * extension specification. The timestamp corresponds to the end of | |
624 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
625 | * pixel in the following video frame. | |
626 | * | |
627 | * Requires support for optional dev->driver->get_scanout_position() | |
628 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
629 | * that corresponds to the true scanout timing. | |
630 | * | |
631 | * The current implementation only handles standard video modes. It | |
632 | * returns as no operation if a doublescan or interlaced video mode is | |
633 | * active. Higher level code is expected to handle this. | |
634 | * | |
f5752b38 DV |
635 | * Returns: |
636 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
637 | * video mode: |
638 | * | |
f5752b38 | 639 | * -EINVAL - Invalid CRTC. |
27641c3f MK |
640 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
641 | * -ENOTSUPP - Function not supported in current display mode. | |
642 | * -EIO - Failed, e.g., due to failed scanout position query. | |
643 | * | |
644 | * Returns or'ed positive status flags on success: | |
645 | * | |
646 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
647 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
648 | * | |
649 | */ | |
650 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, | |
651 | int *max_error, | |
652 | struct timeval *vblank_time, | |
653 | unsigned flags, | |
7da903ef VS |
654 | const struct drm_crtc *refcrtc, |
655 | const struct drm_display_mode *mode) | |
27641c3f | 656 | { |
e62f2f5a | 657 | struct timeval tv_etime; |
d2cb58c8 | 658 | ktime_t stime, etime; |
8072bfa6 | 659 | int vbl_status; |
27641c3f | 660 | int vpos, hpos, i; |
3c184f69 | 661 | int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; |
27641c3f MK |
662 | bool invbl; |
663 | ||
664 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
665 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
666 | return -EINVAL; | |
667 | } | |
668 | ||
669 | /* Scanout position query not supported? Should not happen. */ | |
670 | if (!dev->driver->get_scanout_position) { | |
671 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
672 | return -EIO; | |
673 | } | |
674 | ||
27641c3f MK |
675 | /* Durations of frames, lines, pixels in nanoseconds. */ |
676 | framedur_ns = refcrtc->framedur_ns; | |
677 | linedur_ns = refcrtc->linedur_ns; | |
678 | pixeldur_ns = refcrtc->pixeldur_ns; | |
679 | ||
680 | /* If mode timing undefined, just return as no-op: | |
681 | * Happens during initial modesetting of a crtc. | |
682 | */ | |
8072bfa6 | 683 | if (framedur_ns == 0) { |
27641c3f MK |
684 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); |
685 | return -EAGAIN; | |
686 | } | |
687 | ||
27641c3f MK |
688 | /* Get current scanout position with system timestamp. |
689 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
690 | * if single query takes longer than max_error nanoseconds. | |
691 | * | |
692 | * This guarantees a tight bound on maximum error if | |
693 | * code gets preempted or delayed for some reason. | |
694 | */ | |
695 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
696 | /* |
697 | * Get vertical and horizontal scanout position vpos, hpos, | |
698 | * and bounding timestamps stime, etime, pre/post query. | |
699 | */ | |
abca9e45 | 700 | vbl_status = dev->driver->get_scanout_position(dev, crtc, flags, &vpos, |
8f6fce03 | 701 | &hpos, &stime, &etime); |
27641c3f | 702 | |
27641c3f MK |
703 | /* Return as no-op if scanout query unsupported or failed. */ |
704 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
705 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
706 | crtc, vbl_status); | |
707 | return -EIO; | |
708 | } | |
709 | ||
8f6fce03 | 710 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 711 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
712 | |
713 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 714 | if (duration_ns <= *max_error) |
27641c3f MK |
715 | break; |
716 | } | |
717 | ||
718 | /* Noisy system timing? */ | |
719 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
720 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
3c184f69 | 721 | crtc, duration_ns/1000, *max_error/1000, i); |
27641c3f MK |
722 | } |
723 | ||
724 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 725 | *max_error = duration_ns; |
27641c3f MK |
726 | |
727 | /* Check if in vblank area: | |
728 | * vpos is >=0 in video scanout area, but negative | |
729 | * within vblank area, counting down the number of lines until | |
730 | * start of scanout. | |
731 | */ | |
3d3cbd84 | 732 | invbl = vbl_status & DRM_SCANOUTPOS_IN_VBLANK; |
27641c3f MK |
733 | |
734 | /* Convert scanout position into elapsed time at raw_time query | |
735 | * since start of scanout at first display scanline. delta_ns | |
736 | * can be negative if start of scanout hasn't happened yet. | |
737 | */ | |
3c184f69 | 738 | delta_ns = vpos * linedur_ns + hpos * pixeldur_ns; |
27641c3f | 739 | |
c61eef72 | 740 | if (!drm_timestamp_monotonic) |
d2cb58c8 | 741 | etime = ktime_mono_to_real(etime); |
c61eef72 | 742 | |
e62f2f5a ID |
743 | /* save this only for debugging purposes */ |
744 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
745 | /* Subtract time delta from raw timestamp to get final |
746 | * vblank_time timestamp for end of vblank. | |
747 | */ | |
e91abf80 MD |
748 | if (delta_ns < 0) |
749 | etime = ktime_add_ns(etime, -delta_ns); | |
750 | else | |
751 | etime = ktime_sub_ns(etime, delta_ns); | |
e62f2f5a | 752 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 753 | |
bbb0aef5 JP |
754 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
755 | crtc, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 756 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 | 757 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
3c184f69 | 758 | duration_ns/1000, i); |
27641c3f MK |
759 | |
760 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
761 | if (invbl) | |
3d3cbd84 | 762 | vbl_status |= DRM_VBLANKTIME_IN_VBLANK; |
27641c3f MK |
763 | |
764 | return vbl_status; | |
765 | } | |
766 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
767 | ||
c61eef72 ID |
768 | static struct timeval get_drm_timestamp(void) |
769 | { | |
770 | ktime_t now; | |
771 | ||
d2cb58c8 | 772 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
c61eef72 ID |
773 | return ktime_to_timeval(now); |
774 | } | |
775 | ||
27641c3f MK |
776 | /** |
777 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
f5752b38 | 778 | * vblank interval |
27641c3f | 779 | * @dev: DRM device |
f5752b38 | 780 | * @crtc: which CRTC's vblank timestamp to retrieve |
27641c3f MK |
781 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
782 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
783 | * 0 = Default, |
784 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
785 | * |
786 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 787 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
788 | * compute the timestamp with a high-precision GPU specific method. |
789 | * | |
790 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
791 | * call, i.e., it isn't very precisely locked to the true vblank. | |
792 | * | |
f5752b38 | 793 | * Returns: |
fb446a1a | 794 | * True if timestamp is considered to be very precise, false otherwise. |
27641c3f | 795 | */ |
fb446a1a DV |
796 | static bool |
797 | drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
798 | struct timeval *tvblank, unsigned flags) | |
27641c3f | 799 | { |
4a1b0714 | 800 | int ret; |
27641c3f MK |
801 | |
802 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
803 | int max_error = (int) drm_timestamp_precision * 1000; | |
804 | ||
805 | /* Query driver if possible and precision timestamping enabled. */ | |
806 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
807 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
808 | tvblank, flags); | |
809 | if (ret > 0) | |
fb446a1a | 810 | return true; |
27641c3f MK |
811 | } |
812 | ||
813 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 814 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 815 | */ |
c61eef72 | 816 | *tvblank = get_drm_timestamp(); |
27641c3f | 817 | |
fb446a1a | 818 | return false; |
27641c3f | 819 | } |
27641c3f | 820 | |
0a3e67a4 JB |
821 | /** |
822 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
823 | * @dev: DRM device | |
824 | * @crtc: which counter to retrieve | |
825 | * | |
826 | * Fetches the "cooked" vblank count value that represents the number of | |
827 | * vblank events since the system was booted, including lost events due to | |
828 | * modesetting activity. | |
f5752b38 DV |
829 | * |
830 | * Returns: | |
831 | * The software vblank counter. | |
0a3e67a4 JB |
832 | */ |
833 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
834 | { | |
8a51d5be VS |
835 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
836 | ||
e6ae8687 RC |
837 | if (WARN_ON(crtc >= dev->num_crtcs)) |
838 | return 0; | |
8a51d5be | 839 | return atomic_read(&vblank->count); |
0a3e67a4 JB |
840 | } |
841 | EXPORT_SYMBOL(drm_vblank_count); | |
842 | ||
27641c3f MK |
843 | /** |
844 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
845 | * and the system timestamp corresponding to that vblank counter value. | |
846 | * | |
847 | * @dev: DRM device | |
848 | * @crtc: which counter to retrieve | |
849 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
850 | * | |
851 | * Fetches the "cooked" vblank count value that represents the number of | |
852 | * vblank events since the system was booted, including lost events due to | |
853 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 854 | * of the vblank interval that corresponds to the current vblank counter value. |
27641c3f MK |
855 | */ |
856 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
857 | struct timeval *vblanktime) | |
858 | { | |
8a51d5be | 859 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
860 | u32 cur_vblank; |
861 | ||
e6ae8687 RC |
862 | if (WARN_ON(crtc >= dev->num_crtcs)) |
863 | return 0; | |
864 | ||
27641c3f MK |
865 | /* Read timestamp from slot of _vblank_time ringbuffer |
866 | * that corresponds to current vblank count. Retry if | |
867 | * count has incremented during readout. This works like | |
868 | * a seqlock. | |
869 | */ | |
870 | do { | |
8a51d5be | 871 | cur_vblank = atomic_read(&vblank->count); |
27641c3f MK |
872 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); |
873 | smp_rmb(); | |
8a51d5be | 874 | } while (cur_vblank != atomic_read(&vblank->count)); |
27641c3f MK |
875 | |
876 | return cur_vblank; | |
877 | } | |
878 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
879 | ||
c6eefa17 RC |
880 | static void send_vblank_event(struct drm_device *dev, |
881 | struct drm_pending_vblank_event *e, | |
882 | unsigned long seq, struct timeval *now) | |
883 | { | |
884 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
885 | e->event.sequence = seq; | |
886 | e->event.tv_sec = now->tv_sec; | |
887 | e->event.tv_usec = now->tv_usec; | |
888 | ||
889 | list_add_tail(&e->base.link, | |
890 | &e->base.file_priv->event_list); | |
891 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
892 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
893 | e->event.sequence); | |
894 | } | |
895 | ||
896 | /** | |
897 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
898 | * @dev: DRM device | |
899 | * @crtc: CRTC in question | |
900 | * @e: the event to send | |
901 | * | |
902 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
903 | * Caller must hold event lock. | |
904 | */ | |
905 | void drm_send_vblank_event(struct drm_device *dev, int crtc, | |
906 | struct drm_pending_vblank_event *e) | |
907 | { | |
908 | struct timeval now; | |
909 | unsigned int seq; | |
910 | if (crtc >= 0) { | |
911 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
912 | } else { | |
913 | seq = 0; | |
c61eef72 ID |
914 | |
915 | now = get_drm_timestamp(); | |
c6eefa17 | 916 | } |
21a245d2 | 917 | e->pipe = crtc; |
c6eefa17 RC |
918 | send_vblank_event(dev, e, seq, &now); |
919 | } | |
920 | EXPORT_SYMBOL(drm_send_vblank_event); | |
921 | ||
f2752282 VS |
922 | /** |
923 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
924 | * @dev: DRM device | |
925 | * @crtc: CRTC in question | |
926 | */ | |
927 | static int drm_vblank_enable(struct drm_device *dev, int crtc) | |
928 | { | |
8a51d5be | 929 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f2752282 VS |
930 | int ret = 0; |
931 | ||
932 | assert_spin_locked(&dev->vbl_lock); | |
933 | ||
934 | spin_lock(&dev->vblank_time_lock); | |
935 | ||
8a51d5be | 936 | if (!vblank->enabled) { |
1cfb80b1 DV |
937 | /* |
938 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
939 | * All vblank count & timestamp updates are held off |
940 | * until we are done reinitializing master counter and | |
941 | * timestamps. Filtercode in drm_handle_vblank() will | |
942 | * prevent double-accounting of same vblank interval. | |
943 | */ | |
944 | ret = dev->driver->enable_vblank(dev, crtc); | |
945 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); | |
946 | if (ret) | |
8a51d5be | 947 | atomic_dec(&vblank->refcount); |
f2752282 | 948 | else { |
8a51d5be | 949 | vblank->enabled = true; |
f2752282 VS |
950 | drm_update_vblank_count(dev, crtc); |
951 | } | |
952 | } | |
953 | ||
954 | spin_unlock(&dev->vblank_time_lock); | |
955 | ||
956 | return ret; | |
957 | } | |
958 | ||
0a3e67a4 JB |
959 | /** |
960 | * drm_vblank_get - get a reference count on vblank events | |
961 | * @dev: DRM device | |
962 | * @crtc: which CRTC to own | |
963 | * | |
964 | * Acquire a reference count on vblank events to avoid having them disabled | |
965 | * while in use. | |
966 | * | |
89dd6a4b DV |
967 | * This is the legacy version of drm_crtc_vblank_get(). |
968 | * | |
f5752b38 | 969 | * Returns: |
0a3e67a4 JB |
970 | * Zero on success, nonzero on failure. |
971 | */ | |
972 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
973 | { | |
8a51d5be | 974 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
97cbc883 | 975 | unsigned long irqflags; |
0a3e67a4 JB |
976 | int ret = 0; |
977 | ||
e6ae8687 RC |
978 | if (WARN_ON(crtc >= dev->num_crtcs)) |
979 | return -EINVAL; | |
980 | ||
0a3e67a4 JB |
981 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
982 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 983 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
f2752282 | 984 | ret = drm_vblank_enable(dev, crtc); |
778c9026 | 985 | } else { |
8a51d5be VS |
986 | if (!vblank->enabled) { |
987 | atomic_dec(&vblank->refcount); | |
778c9026 | 988 | ret = -EINVAL; |
0a3e67a4 JB |
989 | } |
990 | } | |
991 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
992 | ||
993 | return ret; | |
994 | } | |
995 | EXPORT_SYMBOL(drm_vblank_get); | |
996 | ||
89dd6a4b DV |
997 | /** |
998 | * drm_crtc_vblank_get - get a reference count on vblank events | |
999 | * @crtc: which CRTC to own | |
1000 | * | |
1001 | * Acquire a reference count on vblank events to avoid having them disabled | |
1002 | * while in use. | |
1003 | * | |
1004 | * This is the native kms version of drm_vblank_off(). | |
1005 | * | |
1006 | * Returns: | |
1007 | * Zero on success, nonzero on failure. | |
1008 | */ | |
1009 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1010 | { | |
1011 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1012 | } | |
1013 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1014 | ||
0a3e67a4 JB |
1015 | /** |
1016 | * drm_vblank_put - give up ownership of vblank events | |
1017 | * @dev: DRM device | |
1018 | * @crtc: which counter to give up | |
1019 | * | |
1020 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 1021 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
1022 | * |
1023 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 JB |
1024 | */ |
1025 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
1026 | { | |
8a51d5be VS |
1027 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
1028 | ||
1029 | BUG_ON(atomic_read(&vblank->refcount) == 0); | |
b3f5e732 | 1030 | |
e6ae8687 RC |
1031 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1032 | return; | |
1033 | ||
0a3e67a4 | 1034 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1035 | if (atomic_dec_and_test(&vblank->refcount)) { |
ab8905f1 DV |
1036 | if (drm_vblank_offdelay == 0) |
1037 | return; | |
1038 | else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) | |
4ed0ce3d | 1039 | vblank_disable_fn((unsigned long)vblank); |
ab8905f1 | 1040 | else |
4ed0ce3d VS |
1041 | mod_timer(&vblank->disable_timer, |
1042 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1043 | } | |
0a3e67a4 JB |
1044 | } |
1045 | EXPORT_SYMBOL(drm_vblank_put); | |
1046 | ||
89dd6a4b DV |
1047 | /** |
1048 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1049 | * @crtc: which counter to give up | |
1050 | * | |
1051 | * Release ownership of a given vblank counter, turning off interrupts | |
1052 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1053 | * | |
1054 | * This is the native kms version of drm_vblank_put(). | |
1055 | */ | |
1056 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1057 | { | |
1058 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1059 | } | |
1060 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1061 | ||
e8450f51 DV |
1062 | /** |
1063 | * drm_wait_one_vblank - wait for one vblank | |
1064 | * @dev: DRM device | |
1065 | * @crtc: crtc index | |
1066 | * | |
1067 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1068 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1069 | * due to lack of driver support or because the crtc is off. | |
1070 | */ | |
1071 | void drm_wait_one_vblank(struct drm_device *dev, int crtc) | |
1072 | { | |
1073 | int ret; | |
1074 | u32 last; | |
1075 | ||
1076 | ret = drm_vblank_get(dev, crtc); | |
1077 | if (WARN_ON(ret)) | |
1078 | return; | |
1079 | ||
1080 | last = drm_vblank_count(dev, crtc); | |
1081 | ||
1082 | ret = wait_event_timeout(dev->vblank[crtc].queue, | |
1083 | last != drm_vblank_count(dev, crtc), | |
1084 | msecs_to_jiffies(100)); | |
1085 | ||
1086 | WARN_ON(ret == 0); | |
1087 | ||
1088 | drm_vblank_put(dev, crtc); | |
1089 | } | |
1090 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1091 | ||
1092 | /** | |
1093 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1094 | * @crtc: DRM crtc | |
1095 | * | |
1096 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1097 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1098 | * due to lack of driver support or because the crtc is off. | |
1099 | */ | |
1100 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1101 | { | |
1102 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1103 | } | |
1104 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1105 | ||
c6eefa17 RC |
1106 | /** |
1107 | * drm_vblank_off - disable vblank events on a CRTC | |
1108 | * @dev: DRM device | |
1109 | * @crtc: CRTC in question | |
1110 | * | |
f5752b38 DV |
1111 | * Drivers can use this function to shut down the vblank interrupt handling when |
1112 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1113 | * stored so that drm_vblank_on() can restore it again. | |
1114 | * | |
1115 | * Drivers must use this function when the hardware vblank counter can get | |
1116 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1117 | * |
1118 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1119 | */ |
778c9026 LP |
1120 | void drm_vblank_off(struct drm_device *dev, int crtc) |
1121 | { | |
8a51d5be | 1122 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
498548ec CJHR |
1123 | struct drm_pending_vblank_event *e, *t; |
1124 | struct timeval now; | |
778c9026 | 1125 | unsigned long irqflags; |
498548ec | 1126 | unsigned int seq; |
778c9026 | 1127 | |
e6ae8687 RC |
1128 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1129 | return; | |
1130 | ||
56cc279b VS |
1131 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1132 | ||
1133 | spin_lock(&dev->vbl_lock); | |
27641c3f | 1134 | vblank_disable_and_save(dev, crtc); |
8a51d5be | 1135 | wake_up(&vblank->queue); |
498548ec | 1136 | |
56cc279b VS |
1137 | /* |
1138 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1139 | * the vblank interrupt by bumping the refcount. | |
1140 | */ | |
1141 | if (!vblank->inmodeset) { | |
1142 | atomic_inc(&vblank->refcount); | |
1143 | vblank->inmodeset = 1; | |
1144 | } | |
1145 | spin_unlock(&dev->vbl_lock); | |
1146 | ||
498548ec CJHR |
1147 | /* Send any queued vblank events, lest the natives grow disquiet */ |
1148 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
e7783ba3 | 1149 | |
498548ec CJHR |
1150 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
1151 | if (e->pipe != crtc) | |
1152 | continue; | |
1153 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
1154 | wanted %d, current %d\n", | |
1155 | e->event.sequence, seq); | |
c6eefa17 | 1156 | list_del(&e->base.link); |
498548ec | 1157 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1158 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1159 | } |
56cc279b | 1160 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 LP |
1161 | } |
1162 | EXPORT_SYMBOL(drm_vblank_off); | |
1163 | ||
89dd6a4b DV |
1164 | /** |
1165 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1166 | * @crtc: CRTC in question | |
1167 | * | |
1168 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1169 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1170 | * stored so that drm_vblank_on can restore it again. | |
1171 | * | |
1172 | * Drivers must use this function when the hardware vblank counter can get | |
1173 | * reset, e.g. when suspending. | |
1174 | * | |
1175 | * This is the native kms version of drm_vblank_off(). | |
1176 | */ | |
1177 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1178 | { | |
1179 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1180 | } | |
1181 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1182 | ||
f2752282 VS |
1183 | /** |
1184 | * drm_vblank_on - enable vblank events on a CRTC | |
1185 | * @dev: DRM device | |
1186 | * @crtc: CRTC in question | |
f5752b38 DV |
1187 | * |
1188 | * This functions restores the vblank interrupt state captured with | |
1189 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
1190 | * drm_vblank_off() can be unbalanced and so can also be unconditionaly called | |
1191 | * in driver load code to reflect the current hardware state of the crtc. | |
89dd6a4b DV |
1192 | * |
1193 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 VS |
1194 | */ |
1195 | void drm_vblank_on(struct drm_device *dev, int crtc) | |
1196 | { | |
8a51d5be | 1197 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f2752282 VS |
1198 | unsigned long irqflags; |
1199 | ||
e6ae8687 RC |
1200 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1201 | return; | |
1202 | ||
f2752282 | 1203 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
7ffd7a68 | 1204 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1205 | if (vblank->inmodeset) { |
1206 | atomic_dec(&vblank->refcount); | |
1207 | vblank->inmodeset = 0; | |
7ffd7a68 | 1208 | } |
f8ad028c VS |
1209 | |
1210 | /* | |
1211 | * sample the current counter to avoid random jumps | |
1212 | * when drm_vblank_enable() applies the diff | |
1213 | * | |
1214 | * -1 to make sure user will never see the same | |
1215 | * vblank counter value before and after a modeset | |
1216 | */ | |
8a51d5be | 1217 | vblank->last = |
f8ad028c VS |
1218 | (dev->driver->get_vblank_counter(dev, crtc) - 1) & |
1219 | dev->max_vblank_count; | |
cd19e52a VS |
1220 | /* |
1221 | * re-enable interrupts if there are users left, or the | |
1222 | * user wishes vblank interrupts to be enabled all the time. | |
1223 | */ | |
1224 | if (atomic_read(&vblank->refcount) != 0 || | |
1225 | (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0)) | |
f2752282 VS |
1226 | WARN_ON(drm_vblank_enable(dev, crtc)); |
1227 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1228 | } | |
1229 | EXPORT_SYMBOL(drm_vblank_on); | |
1230 | ||
89dd6a4b DV |
1231 | /** |
1232 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1233 | * @crtc: CRTC in question | |
1234 | * | |
1235 | * This functions restores the vblank interrupt state captured with | |
1236 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
1237 | * drm_vblank_off() can be unbalanced and so can also be unconditionaly called | |
1238 | * in driver load code to reflect the current hardware state of the crtc. | |
1239 | * | |
1240 | * This is the native kms version of drm_vblank_on(). | |
1241 | */ | |
1242 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1243 | { | |
1244 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1245 | } | |
1246 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1247 | ||
f453ba04 DA |
1248 | /** |
1249 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1250 | * @dev: DRM device | |
1251 | * @crtc: CRTC in question | |
f453ba04 DA |
1252 | * |
1253 | * Account for vblank events across mode setting events, which will likely | |
1254 | * reset the hardware frame counter. | |
f5752b38 DV |
1255 | * |
1256 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1257 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1258 | * software-side vblank frame counting will ensure that there are no jumps or | |
1259 | * discontinuities. | |
1260 | * | |
1261 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1262 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1263 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1264 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1265 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1266 | * counters. | |
1267 | * | |
1268 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1269 | * again. | |
f453ba04 DA |
1270 | */ |
1271 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
1272 | { | |
8a51d5be VS |
1273 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
1274 | ||
b7ea85a4 | 1275 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1276 | if (!dev->num_crtcs) |
1277 | return; | |
e6ae8687 RC |
1278 | |
1279 | if (WARN_ON(crtc >= dev->num_crtcs)) | |
1280 | return; | |
1281 | ||
f453ba04 DA |
1282 | /* |
1283 | * To avoid all the problems that might happen if interrupts | |
1284 | * were enabled/disabled around or between these calls, we just | |
1285 | * have the kernel take a reference on the CRTC (just once though | |
1286 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1287 | * so that interrupts remain enabled in the interim. | |
1288 | */ | |
8a51d5be VS |
1289 | if (!vblank->inmodeset) { |
1290 | vblank->inmodeset = 0x1; | |
b3f5e732 | 1291 | if (drm_vblank_get(dev, crtc) == 0) |
8a51d5be | 1292 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1293 | } |
1294 | } | |
1295 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1296 | ||
f5752b38 DV |
1297 | /** |
1298 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1299 | * @dev: DRM device | |
1300 | * @crtc: CRTC in question | |
1301 | * | |
1302 | * This function again drops the temporary vblank reference acquired in | |
1303 | * drm_vblank_pre_modeset. | |
1304 | */ | |
f453ba04 DA |
1305 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) |
1306 | { | |
8a51d5be | 1307 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f453ba04 DA |
1308 | unsigned long irqflags; |
1309 | ||
b7ea85a4 HC |
1310 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1311 | if (!dev->num_crtcs) | |
1312 | return; | |
1313 | ||
8a51d5be | 1314 | if (vblank->inmodeset) { |
f453ba04 | 1315 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
ba0bf120 | 1316 | dev->vblank_disable_allowed = true; |
f453ba04 | 1317 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1318 | |
8a51d5be | 1319 | if (vblank->inmodeset & 0x2) |
b3f5e732 CW |
1320 | drm_vblank_put(dev, crtc); |
1321 | ||
8a51d5be | 1322 | vblank->inmodeset = 0; |
f453ba04 DA |
1323 | } |
1324 | } | |
1325 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1326 | ||
f5752b38 | 1327 | /* |
0a3e67a4 JB |
1328 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1329 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1330 | * | |
1331 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1332 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1333 | * | |
1334 | * Generally the counter will reset across mode sets. If interrupts are | |
1335 | * enabled around this call, we don't have to do anything since the counter | |
1336 | * will have already been incremented. | |
1337 | */ | |
1338 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1339 | struct drm_file *file_priv) | |
1340 | { | |
1341 | struct drm_modeset_ctl *modeset = data; | |
19227561 | 1342 | unsigned int crtc; |
0a3e67a4 JB |
1343 | |
1344 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1345 | if (!dev->num_crtcs) | |
4a1b0714 | 1346 | return 0; |
0a3e67a4 | 1347 | |
29935554 LP |
1348 | /* KMS drivers handle this internally */ |
1349 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1350 | return 0; | |
1351 | ||
0a3e67a4 | 1352 | crtc = modeset->crtc; |
4a1b0714 LP |
1353 | if (crtc >= dev->num_crtcs) |
1354 | return -EINVAL; | |
0a3e67a4 | 1355 | |
0a3e67a4 JB |
1356 | switch (modeset->cmd) { |
1357 | case _DRM_PRE_MODESET: | |
f453ba04 | 1358 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1359 | break; |
1360 | case _DRM_POST_MODESET: | |
f453ba04 | 1361 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1362 | break; |
1363 | default: | |
4a1b0714 | 1364 | return -EINVAL; |
0a3e67a4 JB |
1365 | } |
1366 | ||
4a1b0714 | 1367 | return 0; |
0a3e67a4 JB |
1368 | } |
1369 | ||
c9a9c5e0 KH |
1370 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1371 | union drm_wait_vblank *vblwait, | |
1372 | struct drm_file *file_priv) | |
1373 | { | |
ffe7c73a | 1374 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1375 | struct drm_pending_vblank_event *e; |
1376 | struct timeval now; | |
1377 | unsigned long flags; | |
1378 | unsigned int seq; | |
ea5d552c | 1379 | int ret; |
c9a9c5e0 KH |
1380 | |
1381 | e = kzalloc(sizeof *e, GFP_KERNEL); | |
ea5d552c CW |
1382 | if (e == NULL) { |
1383 | ret = -ENOMEM; | |
1384 | goto err_put; | |
1385 | } | |
c9a9c5e0 KH |
1386 | |
1387 | e->pipe = pipe; | |
b9c2c9ae | 1388 | e->base.pid = current->pid; |
c9a9c5e0 KH |
1389 | e->event.base.type = DRM_EVENT_VBLANK; |
1390 | e->event.base.length = sizeof e->event; | |
1391 | e->event.user_data = vblwait->request.signal; | |
1392 | e->base.event = &e->event.base; | |
1393 | e->base.file_priv = file_priv; | |
1394 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1395 | ||
c9a9c5e0 KH |
1396 | spin_lock_irqsave(&dev->event_lock, flags); |
1397 | ||
ffe7c73a VS |
1398 | /* |
1399 | * drm_vblank_off() might have been called after we called | |
1400 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1401 | * around the vblank disable, so no need for further locking. | |
1402 | * The reference from drm_vblank_get() protects against | |
1403 | * vblank disable from another source. | |
1404 | */ | |
1405 | if (!vblank->enabled) { | |
1406 | ret = -EINVAL; | |
1407 | goto err_unlock; | |
1408 | } | |
1409 | ||
c9a9c5e0 | 1410 | if (file_priv->event_space < sizeof e->event) { |
ea5d552c CW |
1411 | ret = -EBUSY; |
1412 | goto err_unlock; | |
c9a9c5e0 KH |
1413 | } |
1414 | ||
1415 | file_priv->event_space -= sizeof e->event; | |
27641c3f MK |
1416 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1417 | ||
c9a9c5e0 KH |
1418 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1419 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1420 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1421 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1422 | } |
1423 | ||
1424 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1425 | vblwait->request.sequence, seq, pipe); | |
1426 | ||
b9c2c9ae JB |
1427 | trace_drm_vblank_event_queued(current->pid, pipe, |
1428 | vblwait->request.sequence); | |
1429 | ||
c9a9c5e0 KH |
1430 | e->event.sequence = vblwait->request.sequence; |
1431 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1432 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1433 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1434 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1435 | } else { |
a6778e9e | 1436 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1437 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1438 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1439 | } |
1440 | ||
1441 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1442 | ||
1443 | return 0; | |
ea5d552c CW |
1444 | |
1445 | err_unlock: | |
1446 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1447 | kfree(e); | |
1448 | err_put: | |
6f331623 | 1449 | drm_vblank_put(dev, pipe); |
ea5d552c | 1450 | return ret; |
c9a9c5e0 KH |
1451 | } |
1452 | ||
f5752b38 | 1453 | /* |
1da177e4 LT |
1454 | * Wait for VBLANK. |
1455 | * | |
1456 | * \param inode device inode. | |
6c340eac | 1457 | * \param file_priv DRM file private. |
1da177e4 LT |
1458 | * \param cmd command. |
1459 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1460 | * \return zero on success or a negative number on failure. | |
1461 | * | |
30b23634 EA |
1462 | * This function enables the vblank interrupt on the pipe requested, then |
1463 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1464 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1465 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1466 | */ |
0a3e67a4 JB |
1467 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1468 | struct drm_file *file_priv) | |
1da177e4 | 1469 | { |
8a51d5be | 1470 | struct drm_vblank_crtc *vblank; |
c153f45f | 1471 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1472 | int ret; |
19b01b5f | 1473 | unsigned int flags, seq, crtc, high_crtc; |
1da177e4 | 1474 | |
4984979b DV |
1475 | if (!dev->irq_enabled) |
1476 | return -EINVAL; | |
1da177e4 | 1477 | |
30b23634 EA |
1478 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1479 | return -EINVAL; | |
1480 | ||
c153f45f | 1481 | if (vblwait->request.type & |
19b01b5f IH |
1482 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1483 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1484 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1485 | vblwait->request.type, |
19b01b5f IH |
1486 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1487 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MCA |
1488 | return -EINVAL; |
1489 | } | |
1490 | ||
c153f45f | 1491 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
19b01b5f IH |
1492 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1493 | if (high_crtc) | |
1494 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1495 | else | |
1496 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
0a3e67a4 | 1497 | if (crtc >= dev->num_crtcs) |
776c9443 MCA |
1498 | return -EINVAL; |
1499 | ||
8a51d5be VS |
1500 | vblank = &dev->vblank[crtc]; |
1501 | ||
0a3e67a4 JB |
1502 | ret = drm_vblank_get(dev, crtc); |
1503 | if (ret) { | |
8d3457ec | 1504 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1505 | return ret; |
1506 | } | |
1507 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1508 | |
c153f45f | 1509 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1510 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1511 | vblwait->request.sequence += seq; |
1512 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1513 | case _DRM_VBLANK_ABSOLUTE: |
1514 | break; | |
1515 | default: | |
0a3e67a4 JB |
1516 | ret = -EINVAL; |
1517 | goto done; | |
1da177e4 LT |
1518 | } |
1519 | ||
a6778e9e IH |
1520 | if (flags & _DRM_VBLANK_EVENT) { |
1521 | /* must hold on to the vblank ref until the event fires | |
1522 | * drm_vblank_put will be called asynchronously | |
1523 | */ | |
c9a9c5e0 | 1524 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); |
a6778e9e | 1525 | } |
c9a9c5e0 | 1526 | |
ab285d74 | 1527 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1528 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1529 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
1530 | } |
1531 | ||
30b23634 EA |
1532 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1533 | vblwait->request.sequence, crtc); | |
8a51d5be VS |
1534 | vblank->last_wait = vblwait->request.sequence; |
1535 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
30b23634 EA |
1536 | (((drm_vblank_count(dev, crtc) - |
1537 | vblwait->request.sequence) <= (1 << 23)) || | |
8a51d5be | 1538 | !vblank->enabled || |
30b23634 | 1539 | !dev->irq_enabled)); |
1da177e4 | 1540 | |
30b23634 EA |
1541 | if (ret != -EINTR) { |
1542 | struct timeval now; | |
1da177e4 | 1543 | |
27641c3f | 1544 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1545 | vblwait->reply.tval_sec = now.tv_sec; |
1546 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1547 | |
30b23634 EA |
1548 | DRM_DEBUG("returning %d to client\n", |
1549 | vblwait->reply.sequence); | |
1da177e4 | 1550 | } else { |
30b23634 | 1551 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1552 | } |
1553 | ||
0a3e67a4 JB |
1554 | done: |
1555 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1556 | return ret; |
1557 | } | |
1558 | ||
ea7f7abc | 1559 | static void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
c9a9c5e0 KH |
1560 | { |
1561 | struct drm_pending_vblank_event *e, *t; | |
1562 | struct timeval now; | |
c9a9c5e0 KH |
1563 | unsigned int seq; |
1564 | ||
56cc279b | 1565 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1566 | |
56cc279b | 1567 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1568 | |
1569 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1570 | if (e->pipe != crtc) | |
1571 | continue; | |
1572 | if ((seq - e->event.sequence) > (1<<23)) | |
1573 | continue; | |
1574 | ||
1575 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1576 | e->event.sequence, seq); | |
1577 | ||
c6eefa17 | 1578 | list_del(&e->base.link); |
c9a9c5e0 | 1579 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1580 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1581 | } |
1582 | ||
ac2874b9 | 1583 | trace_drm_vblank_event(crtc, seq); |
c9a9c5e0 KH |
1584 | } |
1585 | ||
0a3e67a4 JB |
1586 | /** |
1587 | * drm_handle_vblank - handle a vblank event | |
1588 | * @dev: DRM device | |
1589 | * @crtc: where this event occurred | |
1590 | * | |
1591 | * Drivers should call this routine in their vblank interrupt handlers to | |
1592 | * update the vblank counter and send any signals that may be pending. | |
1593 | */ | |
78c6e170 | 1594 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1595 | { |
8a51d5be | 1596 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
1597 | u32 vblcount; |
1598 | s64 diff_ns; | |
1599 | struct timeval tvblank; | |
1600 | unsigned long irqflags; | |
1601 | ||
c9a9c5e0 | 1602 | if (!dev->num_crtcs) |
78c6e170 | 1603 | return false; |
c9a9c5e0 | 1604 | |
e6ae8687 RC |
1605 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1606 | return false; | |
1607 | ||
56cc279b VS |
1608 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1609 | ||
27641c3f MK |
1610 | /* Need timestamp lock to prevent concurrent execution with |
1611 | * vblank enable/disable, as this would cause inconsistent | |
1612 | * or corrupted timestamps and vblank counts. | |
1613 | */ | |
56cc279b | 1614 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1615 | |
1616 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1617 | if (!vblank->enabled) { |
56cc279b VS |
1618 | spin_unlock(&dev->vblank_time_lock); |
1619 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1620 | return false; |
27641c3f MK |
1621 | } |
1622 | ||
1623 | /* Fetch corresponding timestamp for this vblank interval from | |
1624 | * driver and store it in proper slot of timestamp ringbuffer. | |
1625 | */ | |
1626 | ||
1627 | /* Get current timestamp and count. */ | |
8a51d5be | 1628 | vblcount = atomic_read(&vblank->count); |
27641c3f MK |
1629 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); |
1630 | ||
1631 | /* Compute time difference to timestamp of last vblank */ | |
1632 | diff_ns = timeval_to_ns(&tvblank) - | |
1633 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1634 | ||
1635 | /* Update vblank timestamp and count if at least | |
1636 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1637 | * difference between last stored timestamp and current | |
1638 | * timestamp. A smaller difference means basically | |
1639 | * identical timestamps. Happens if this vblank has | |
1640 | * been already processed and this is a redundant call, | |
1641 | * e.g., due to spurious vblank interrupts. We need to | |
1642 | * ignore those for accounting. | |
1643 | */ | |
c4cc3839 | 1644 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { |
27641c3f MK |
1645 | /* Store new timestamp in ringbuffer. */ |
1646 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
27641c3f MK |
1647 | |
1648 | /* Increment cooked vblank count. This also atomically commits | |
1649 | * the timestamp computed above. | |
1650 | */ | |
4e857c58 | 1651 | smp_mb__before_atomic(); |
8a51d5be | 1652 | atomic_inc(&vblank->count); |
4e857c58 | 1653 | smp_mb__after_atomic(); |
27641c3f MK |
1654 | } else { |
1655 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", | |
1656 | crtc, (int) diff_ns); | |
1657 | } | |
1658 | ||
56cc279b VS |
1659 | spin_unlock(&dev->vblank_time_lock); |
1660 | ||
8a51d5be | 1661 | wake_up(&vblank->queue); |
c9a9c5e0 | 1662 | drm_handle_vblank_events(dev, crtc); |
27641c3f | 1663 | |
56cc279b VS |
1664 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1665 | ||
78c6e170 | 1666 | return true; |
0a3e67a4 JB |
1667 | } |
1668 | EXPORT_SYMBOL(drm_handle_vblank); |