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 | ||
13b030af VS |
58 | /** |
59 | * drm_update_vblank_count - update the master vblank counter | |
60 | * @dev: DRM device | |
61 | * @crtc: counter to update | |
62 | * | |
63 | * Call back into the driver to update the appropriate vblank counter | |
64 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
65 | * update the last read value so we can deal with wraparound on the next | |
66 | * call if necessary. | |
67 | * | |
68 | * Only necessary when going from off->on, to account for frames we | |
69 | * didn't get an interrupt for. | |
70 | * | |
71 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
72 | * device vblank fields. | |
73 | */ | |
74 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
75 | { | |
8a51d5be | 76 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
13b030af VS |
77 | u32 cur_vblank, diff, tslot, rc; |
78 | struct timeval t_vblank; | |
79 | ||
80 | /* | |
81 | * Interrupts were disabled prior to this call, so deal with counter | |
82 | * wrap if needed. | |
83 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
84 | * here if the register is small or we had vblank interrupts off for | |
85 | * a long time. | |
86 | * | |
87 | * We repeat the hardware vblank counter & timestamp query until | |
88 | * we get consistent results. This to prevent races between gpu | |
89 | * updating its hardware counter while we are retrieving the | |
90 | * corresponding vblank timestamp. | |
91 | */ | |
92 | do { | |
93 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
94 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
95 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
96 | ||
97 | /* Deal with counter wrap */ | |
8a51d5be VS |
98 | diff = cur_vblank - vblank->last; |
99 | if (cur_vblank < vblank->last) { | |
13b030af VS |
100 | diff += dev->max_vblank_count; |
101 | ||
102 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
8a51d5be | 103 | crtc, vblank->last, cur_vblank, diff); |
13b030af VS |
104 | } |
105 | ||
96a9fdd7 | 106 | DRM_DEBUG("updating vblank count on crtc %d, missed %d\n", |
13b030af VS |
107 | crtc, diff); |
108 | ||
109 | /* Reinitialize corresponding vblank timestamp if high-precision query | |
110 | * available. Skip this step if query unsupported or failed. Will | |
111 | * reinitialize delayed at next vblank interrupt in that case. | |
112 | */ | |
113 | if (rc) { | |
8a51d5be | 114 | tslot = atomic_read(&vblank->count) + diff; |
13b030af VS |
115 | vblanktimestamp(dev, crtc, tslot) = t_vblank; |
116 | } | |
117 | ||
118 | smp_mb__before_atomic(); | |
8a51d5be | 119 | atomic_add(diff, &vblank->count); |
13b030af VS |
120 | smp_mb__after_atomic(); |
121 | } | |
122 | ||
27641c3f MK |
123 | /* |
124 | * Disable vblank irq's on crtc, make sure that last vblank count | |
125 | * of hardware and corresponding consistent software vblank counter | |
126 | * are preserved, even if there are any spurious vblank irq's after | |
127 | * disable. | |
128 | */ | |
129 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
130 | { | |
8a51d5be | 131 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
132 | unsigned long irqflags; |
133 | u32 vblcount; | |
134 | s64 diff_ns; | |
135 | int vblrc; | |
136 | struct timeval tvblank; | |
0355cf3a | 137 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
138 | |
139 | /* Prevent vblank irq processing while disabling vblank irqs, | |
140 | * so no updates of timestamps or count can happen after we've | |
141 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 142 | */ |
27641c3f MK |
143 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
144 | ||
812e7465 VS |
145 | /* |
146 | * If the vblank interrupt was already disbled update the count | |
147 | * and timestamp to maintain the appearance that the counter | |
148 | * has been ticking all along until this time. This makes the | |
149 | * count account for the entire time between drm_vblank_on() and | |
150 | * drm_vblank_off(). | |
151 | */ | |
8a51d5be | 152 | if (!vblank->enabled) { |
812e7465 VS |
153 | drm_update_vblank_count(dev, crtc); |
154 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
155 | return; | |
156 | } | |
157 | ||
27641c3f | 158 | dev->driver->disable_vblank(dev, crtc); |
8a51d5be | 159 | vblank->enabled = false; |
27641c3f MK |
160 | |
161 | /* No further vblank irq's will be processed after | |
162 | * this point. Get current hardware vblank count and | |
163 | * vblank timestamp, repeat until they are consistent. | |
164 | * | |
165 | * FIXME: There is still a race condition here and in | |
166 | * drm_update_vblank_count() which can cause off-by-one | |
167 | * reinitialization of software vblank counter. If gpu | |
168 | * vblank counter doesn't increment exactly at the leading | |
169 | * edge of a vblank interval, then we can lose 1 count if | |
170 | * we happen to execute between start of vblank and the | |
171 | * delayed gpu counter increment. | |
172 | */ | |
173 | do { | |
8a51d5be | 174 | vblank->last = dev->driver->get_vblank_counter(dev, crtc); |
27641c3f | 175 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); |
8a51d5be | 176 | } while (vblank->last != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc); |
0355cf3a EE |
177 | |
178 | if (!count) | |
179 | vblrc = 0; | |
27641c3f MK |
180 | |
181 | /* Compute time difference to stored timestamp of last vblank | |
182 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
183 | */ | |
8a51d5be | 184 | vblcount = atomic_read(&vblank->count); |
27641c3f MK |
185 | diff_ns = timeval_to_ns(&tvblank) - |
186 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
187 | ||
188 | /* If there is at least 1 msec difference between the last stored | |
189 | * timestamp and tvblank, then we are currently executing our | |
190 | * disable inside a new vblank interval, the tvblank timestamp | |
191 | * corresponds to this new vblank interval and the irq handler | |
192 | * for this vblank didn't run yet and won't run due to our disable. | |
193 | * Therefore we need to do the job of drm_handle_vblank() and | |
194 | * increment the vblank counter by one to account for this vblank. | |
195 | * | |
196 | * Skip this step if there isn't any high precision timestamp | |
197 | * available. In that case we can't account for this and just | |
198 | * hope for the best. | |
199 | */ | |
bc215128 | 200 | if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) { |
c50d7521 VS |
201 | /* Store new timestamp in ringbuffer. */ |
202 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
203 | ||
204 | /* Increment cooked vblank count. This also atomically commits | |
205 | * the timestamp computed above. | |
206 | */ | |
207 | smp_mb__before_atomic(); | |
8a51d5be | 208 | atomic_inc(&vblank->count); |
4e857c58 | 209 | smp_mb__after_atomic(); |
bc215128 | 210 | } |
27641c3f | 211 | |
27641c3f | 212 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
213 | } |
214 | ||
0a3e67a4 JB |
215 | static void vblank_disable_fn(unsigned long arg) |
216 | { | |
e69595c2 VS |
217 | struct drm_vblank_crtc *vblank = (void *)arg; |
218 | struct drm_device *dev = vblank->dev; | |
0a3e67a4 | 219 | unsigned long irqflags; |
e69595c2 | 220 | int crtc = vblank->crtc; |
0a3e67a4 JB |
221 | |
222 | if (!dev->vblank_disable_allowed) | |
223 | return; | |
224 | ||
e69595c2 VS |
225 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
226 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
227 | DRM_DEBUG("disabling vblank on crtc %d\n", crtc); | |
228 | vblank_disable_and_save(dev, crtc); | |
0a3e67a4 | 229 | } |
e69595c2 | 230 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
231 | } |
232 | ||
f5752b38 DV |
233 | /** |
234 | * drm_vblank_cleanup - cleanup vblank support | |
235 | * @dev: DRM device | |
236 | * | |
237 | * This function cleans up any resources allocated in drm_vblank_init. | |
238 | */ | |
52440211 | 239 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 240 | { |
e69595c2 VS |
241 | int crtc; |
242 | ||
0a3e67a4 JB |
243 | /* Bail if the driver didn't call drm_vblank_init() */ |
244 | if (dev->num_crtcs == 0) | |
245 | return; | |
246 | ||
e69595c2 | 247 | for (crtc = 0; crtc < dev->num_crtcs; crtc++) { |
8a51d5be VS |
248 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
249 | ||
250 | del_timer_sync(&vblank->disable_timer); | |
251 | vblank_disable_fn((unsigned long)vblank); | |
e69595c2 | 252 | } |
0a3e67a4 | 253 | |
5380e929 | 254 | kfree(dev->vblank); |
0a3e67a4 JB |
255 | |
256 | dev->num_crtcs = 0; | |
257 | } | |
e77cef9c | 258 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 259 | |
f5752b38 DV |
260 | /** |
261 | * drm_vblank_init - initialize vblank support | |
262 | * @dev: drm_device | |
263 | * @num_crtcs: number of crtcs supported by @dev | |
264 | * | |
265 | * This function initializes vblank support for @num_crtcs display pipelines. | |
266 | * | |
267 | * Returns: | |
268 | * Zero on success or a negative error code on failure. | |
269 | */ | |
0a3e67a4 JB |
270 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) |
271 | { | |
272 | int i, ret = -ENOMEM; | |
273 | ||
0a3e67a4 | 274 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
275 | spin_lock_init(&dev->vblank_time_lock); |
276 | ||
0a3e67a4 JB |
277 | dev->num_crtcs = num_crtcs; |
278 | ||
5380e929 VS |
279 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
280 | if (!dev->vblank) | |
0a3e67a4 JB |
281 | goto err; |
282 | ||
e69595c2 | 283 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
284 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
285 | ||
286 | vblank->dev = dev; | |
287 | vblank->crtc = i; | |
288 | init_waitqueue_head(&vblank->queue); | |
289 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
290 | (unsigned long)vblank); | |
e69595c2 | 291 | } |
27641c3f | 292 | |
8f6fce03 | 293 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
294 | |
295 | /* Driver specific high-precision vblank timestamping supported? */ | |
296 | if (dev->driver->get_vblank_timestamp) | |
297 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
298 | else | |
299 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
300 | ||
ba0bf120 VS |
301 | dev->vblank_disable_allowed = false; |
302 | ||
0a3e67a4 JB |
303 | return 0; |
304 | ||
305 | err: | |
306 | drm_vblank_cleanup(dev); | |
307 | return ret; | |
308 | } | |
309 | EXPORT_SYMBOL(drm_vblank_init); | |
310 | ||
28d52043 DA |
311 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
312 | { | |
313 | struct drm_device *dev = cookie; | |
314 | ||
315 | if (dev->driver->vgaarb_irq) { | |
316 | dev->driver->vgaarb_irq(dev, state); | |
317 | return; | |
318 | } | |
319 | ||
320 | if (!dev->irq_enabled) | |
321 | return; | |
322 | ||
5037f8ac JS |
323 | if (state) { |
324 | if (dev->driver->irq_uninstall) | |
325 | dev->driver->irq_uninstall(dev); | |
326 | } else { | |
327 | if (dev->driver->irq_preinstall) | |
328 | dev->driver->irq_preinstall(dev); | |
329 | if (dev->driver->irq_postinstall) | |
330 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
331 | } |
332 | } | |
333 | ||
1da177e4 | 334 | /** |
f5752b38 DV |
335 | * drm_irq_install - install IRQ handler |
336 | * @dev: DRM device | |
337 | * @irq: IRQ number to install the handler for | |
1da177e4 | 338 | * |
0a3e67a4 | 339 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
340 | * irq_preinstall() and irq_postinstall() functions before and after the |
341 | * installation. | |
342 | * | |
343 | * This is the simplified helper interface provided for drivers with no special | |
344 | * needs. Drivers which need to install interrupt handlers for multiple | |
345 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
346 | * that vblank interrupts are available. | |
347 | * | |
348 | * Returns: | |
349 | * Zero on success or a negative error code on failure. | |
1da177e4 | 350 | */ |
bb0f1b5c | 351 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 352 | { |
4a1b0714 | 353 | int ret; |
b5e89ed5 | 354 | unsigned long sh_flags = 0; |
1da177e4 LT |
355 | |
356 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
357 | return -EINVAL; | |
358 | ||
7c1a38e3 | 359 | if (irq == 0) |
1da177e4 LT |
360 | return -EINVAL; |
361 | ||
1da177e4 | 362 | /* Driver must have been initialized */ |
e090c53b | 363 | if (!dev->dev_private) |
1da177e4 | 364 | return -EINVAL; |
1da177e4 | 365 | |
e090c53b | 366 | if (dev->irq_enabled) |
1da177e4 | 367 | return -EBUSY; |
4423843c | 368 | dev->irq_enabled = true; |
1da177e4 | 369 | |
7c1a38e3 | 370 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 371 | |
b5e89ed5 | 372 | /* Before installing handler */ |
5037f8ac JS |
373 | if (dev->driver->irq_preinstall) |
374 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 375 | |
b5e89ed5 | 376 | /* Install handler */ |
1da177e4 | 377 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 378 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 379 | |
7c1a38e3 | 380 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 381 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 382 | |
b5e89ed5 | 383 | if (ret < 0) { |
4423843c | 384 | dev->irq_enabled = false; |
1da177e4 LT |
385 | return ret; |
386 | } | |
387 | ||
28d52043 DA |
388 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
389 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
390 | ||
b5e89ed5 | 391 | /* After installing handler */ |
5037f8ac JS |
392 | if (dev->driver->irq_postinstall) |
393 | ret = dev->driver->irq_postinstall(dev); | |
394 | ||
0a3e67a4 | 395 | if (ret < 0) { |
4423843c | 396 | dev->irq_enabled = false; |
e1c44acc JS |
397 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
398 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
7c1a38e3 DV |
399 | free_irq(irq, dev); |
400 | } else { | |
401 | dev->irq = irq; | |
0a3e67a4 | 402 | } |
1da177e4 | 403 | |
0a3e67a4 | 404 | return ret; |
1da177e4 | 405 | } |
0a3e67a4 | 406 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
407 | |
408 | /** | |
f5752b38 DV |
409 | * drm_irq_uninstall - uninstall the IRQ handler |
410 | * @dev: DRM device | |
411 | * | |
412 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
413 | * This should only be called by drivers which used drm_irq_install() to set up | |
414 | * their interrupt handler. Other drivers must only reset | |
415 | * drm_device->irq_enabled to false. | |
1da177e4 | 416 | * |
f5752b38 DV |
417 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
418 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
419 | * the same function through an ioctl. | |
1da177e4 | 420 | * |
f5752b38 DV |
421 | * Returns: |
422 | * Zero on success or a negative error code on failure. | |
1da177e4 | 423 | */ |
27641c3f | 424 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 425 | { |
dc1336ff | 426 | unsigned long irqflags; |
4423843c VS |
427 | bool irq_enabled; |
428 | int i; | |
1da177e4 LT |
429 | |
430 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
431 | return -EINVAL; | |
432 | ||
1da177e4 | 433 | irq_enabled = dev->irq_enabled; |
4423843c | 434 | dev->irq_enabled = false; |
1da177e4 | 435 | |
dc1336ff JB |
436 | /* |
437 | * Wake up any waiters so they don't hang. | |
438 | */ | |
bde4889a BS |
439 | if (dev->num_crtcs) { |
440 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
441 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
442 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
443 | ||
444 | wake_up(&vblank->queue); | |
445 | vblank->enabled = false; | |
446 | vblank->last = | |
bde4889a BS |
447 | dev->driver->get_vblank_counter(dev, i); |
448 | } | |
449 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 450 | } |
dc1336ff | 451 | |
b5e89ed5 | 452 | if (!irq_enabled) |
1da177e4 LT |
453 | return -EINVAL; |
454 | ||
7c1a38e3 | 455 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 456 | |
28d52043 DA |
457 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
458 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
459 | ||
5037f8ac JS |
460 | if (dev->driver->irq_uninstall) |
461 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 462 | |
7c1a38e3 | 463 | free_irq(dev->irq, dev); |
1da177e4 LT |
464 | |
465 | return 0; | |
466 | } | |
467 | EXPORT_SYMBOL(drm_irq_uninstall); | |
468 | ||
f5752b38 | 469 | /* |
1da177e4 LT |
470 | * IRQ control ioctl. |
471 | * | |
472 | * \param inode device inode. | |
6c340eac | 473 | * \param file_priv DRM file private. |
1da177e4 LT |
474 | * \param cmd command. |
475 | * \param arg user argument, pointing to a drm_control structure. | |
476 | * \return zero on success or a negative number on failure. | |
477 | * | |
478 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
479 | */ | |
c153f45f EA |
480 | int drm_control(struct drm_device *dev, void *data, |
481 | struct drm_file *file_priv) | |
1da177e4 | 482 | { |
c153f45f | 483 | struct drm_control *ctl = data; |
a319c1a4 | 484 | int ret = 0, irq; |
b5e89ed5 | 485 | |
27641c3f MK |
486 | /* if we haven't irq we fallback for compatibility reasons - |
487 | * this used to be a separate function in drm_dma.h | |
488 | */ | |
1da177e4 | 489 | |
22471cf6 DV |
490 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
491 | return 0; | |
492 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
493 | return 0; | |
494 | /* UMS was only ever support on pci devices. */ | |
495 | if (WARN_ON(!dev->pdev)) | |
496 | return -EINVAL; | |
1da177e4 | 497 | |
c153f45f | 498 | switch (ctl->func) { |
1da177e4 | 499 | case DRM_INST_HANDLER: |
a319c1a4 DV |
500 | irq = dev->pdev->irq; |
501 | ||
1da177e4 | 502 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 503 | ctl->irq != irq) |
1da177e4 | 504 | return -EINVAL; |
e090c53b | 505 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 506 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
507 | mutex_unlock(&dev->struct_mutex); |
508 | ||
509 | return ret; | |
1da177e4 | 510 | case DRM_UNINST_HANDLER: |
e090c53b DV |
511 | mutex_lock(&dev->struct_mutex); |
512 | ret = drm_irq_uninstall(dev); | |
513 | mutex_unlock(&dev->struct_mutex); | |
514 | ||
515 | return ret; | |
1da177e4 LT |
516 | default: |
517 | return -EINVAL; | |
518 | } | |
519 | } | |
520 | ||
27641c3f | 521 | /** |
f5752b38 DV |
522 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
523 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
524 | * @mode: display mode containing the scanout timings | |
27641c3f | 525 | * |
21b21560 VS |
526 | * Calculate and store various constants which are later |
527 | * needed by vblank and swap-completion timestamping, e.g, | |
528 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 529 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 530 | * things like panel scaling or other adjustments into account. |
27641c3f | 531 | */ |
545cdd55 VS |
532 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
533 | const struct drm_display_mode *mode) | |
27641c3f | 534 | { |
3c184f69 | 535 | int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; |
77666b72 | 536 | int dotclock = mode->crtc_clock; |
27641c3f MK |
537 | |
538 | /* Valid dotclock? */ | |
539 | if (dotclock > 0) { | |
0dae35a3 VS |
540 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
541 | ||
542 | /* | |
543 | * Convert scanline length in pixels and video | |
544 | * dot clock to line duration, frame duration | |
545 | * and pixel duration in nanoseconds: | |
27641c3f | 546 | */ |
0dae35a3 VS |
547 | pixeldur_ns = 1000000 / dotclock; |
548 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
549 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
550 | |
551 | /* | |
552 | * Fields of interlaced scanout modes are only half a frame duration. | |
553 | */ | |
554 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
555 | framedur_ns /= 2; | |
27641c3f MK |
556 | } else |
557 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", | |
558 | crtc->base.id); | |
559 | ||
560 | crtc->pixeldur_ns = pixeldur_ns; | |
561 | crtc->linedur_ns = linedur_ns; | |
562 | crtc->framedur_ns = framedur_ns; | |
563 | ||
564 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
545cdd55 VS |
565 | crtc->base.id, mode->crtc_htotal, |
566 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
27641c3f | 567 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", |
3c184f69 VS |
568 | crtc->base.id, dotclock, framedur_ns, |
569 | linedur_ns, pixeldur_ns); | |
27641c3f MK |
570 | } |
571 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
572 | ||
573 | /** | |
f5752b38 DV |
574 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
575 | * @dev: DRM device | |
576 | * @crtc: Which CRTC's vblank timestamp to retrieve | |
577 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
578 | * On return contains true maximum error of timestamp | |
579 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
580 | * @flags: Flags to pass to driver: | |
581 | * 0 = Default, | |
582 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
583 | * @refcrtc: CRTC which defines scanout timing | |
584 | * @mode: mode which defines the scanout timings | |
585 | * | |
586 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
587 | * timings and current video scanout position of a CRTC. This can be called from | |
588 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
589 | * actual timestamping. | |
27641c3f MK |
590 | * |
591 | * Should return timestamps conforming to the OML_sync_control OpenML | |
592 | * extension specification. The timestamp corresponds to the end of | |
593 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
594 | * pixel in the following video frame. | |
595 | * | |
596 | * Requires support for optional dev->driver->get_scanout_position() | |
597 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
598 | * that corresponds to the true scanout timing. | |
599 | * | |
600 | * The current implementation only handles standard video modes. It | |
601 | * returns as no operation if a doublescan or interlaced video mode is | |
602 | * active. Higher level code is expected to handle this. | |
603 | * | |
f5752b38 DV |
604 | * Returns: |
605 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
606 | * video mode: |
607 | * | |
f5752b38 | 608 | * -EINVAL - Invalid CRTC. |
27641c3f MK |
609 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
610 | * -ENOTSUPP - Function not supported in current display mode. | |
611 | * -EIO - Failed, e.g., due to failed scanout position query. | |
612 | * | |
613 | * Returns or'ed positive status flags on success: | |
614 | * | |
615 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
616 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
617 | * | |
618 | */ | |
619 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, | |
620 | int *max_error, | |
621 | struct timeval *vblank_time, | |
622 | unsigned flags, | |
7da903ef VS |
623 | const struct drm_crtc *refcrtc, |
624 | const struct drm_display_mode *mode) | |
27641c3f | 625 | { |
e62f2f5a ID |
626 | ktime_t stime, etime, mono_time_offset; |
627 | struct timeval tv_etime; | |
8072bfa6 | 628 | int vbl_status; |
27641c3f | 629 | int vpos, hpos, i; |
3c184f69 | 630 | int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; |
27641c3f MK |
631 | bool invbl; |
632 | ||
633 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
634 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
635 | return -EINVAL; | |
636 | } | |
637 | ||
638 | /* Scanout position query not supported? Should not happen. */ | |
639 | if (!dev->driver->get_scanout_position) { | |
640 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
641 | return -EIO; | |
642 | } | |
643 | ||
27641c3f MK |
644 | /* Durations of frames, lines, pixels in nanoseconds. */ |
645 | framedur_ns = refcrtc->framedur_ns; | |
646 | linedur_ns = refcrtc->linedur_ns; | |
647 | pixeldur_ns = refcrtc->pixeldur_ns; | |
648 | ||
649 | /* If mode timing undefined, just return as no-op: | |
650 | * Happens during initial modesetting of a crtc. | |
651 | */ | |
8072bfa6 | 652 | if (framedur_ns == 0) { |
27641c3f MK |
653 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); |
654 | return -EAGAIN; | |
655 | } | |
656 | ||
27641c3f MK |
657 | /* Get current scanout position with system timestamp. |
658 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
659 | * if single query takes longer than max_error nanoseconds. | |
660 | * | |
661 | * This guarantees a tight bound on maximum error if | |
662 | * code gets preempted or delayed for some reason. | |
663 | */ | |
664 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
665 | /* |
666 | * Get vertical and horizontal scanout position vpos, hpos, | |
667 | * and bounding timestamps stime, etime, pre/post query. | |
668 | */ | |
abca9e45 | 669 | vbl_status = dev->driver->get_scanout_position(dev, crtc, flags, &vpos, |
8f6fce03 | 670 | &hpos, &stime, &etime); |
27641c3f | 671 | |
8f6fce03 MK |
672 | /* |
673 | * Get correction for CLOCK_MONOTONIC -> CLOCK_REALTIME if | |
674 | * CLOCK_REALTIME is requested. | |
675 | */ | |
c61eef72 ID |
676 | if (!drm_timestamp_monotonic) |
677 | mono_time_offset = ktime_get_monotonic_offset(); | |
27641c3f | 678 | |
27641c3f MK |
679 | /* Return as no-op if scanout query unsupported or failed. */ |
680 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
681 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
682 | crtc, vbl_status); | |
683 | return -EIO; | |
684 | } | |
685 | ||
8f6fce03 | 686 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 687 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
688 | |
689 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 690 | if (duration_ns <= *max_error) |
27641c3f MK |
691 | break; |
692 | } | |
693 | ||
694 | /* Noisy system timing? */ | |
695 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
696 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
3c184f69 | 697 | crtc, duration_ns/1000, *max_error/1000, i); |
27641c3f MK |
698 | } |
699 | ||
700 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 701 | *max_error = duration_ns; |
27641c3f MK |
702 | |
703 | /* Check if in vblank area: | |
704 | * vpos is >=0 in video scanout area, but negative | |
705 | * within vblank area, counting down the number of lines until | |
706 | * start of scanout. | |
707 | */ | |
708 | invbl = vbl_status & DRM_SCANOUTPOS_INVBL; | |
709 | ||
710 | /* Convert scanout position into elapsed time at raw_time query | |
711 | * since start of scanout at first display scanline. delta_ns | |
712 | * can be negative if start of scanout hasn't happened yet. | |
713 | */ | |
3c184f69 | 714 | delta_ns = vpos * linedur_ns + hpos * pixeldur_ns; |
27641c3f | 715 | |
c61eef72 ID |
716 | if (!drm_timestamp_monotonic) |
717 | etime = ktime_sub(etime, mono_time_offset); | |
718 | ||
e62f2f5a ID |
719 | /* save this only for debugging purposes */ |
720 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
721 | /* Subtract time delta from raw timestamp to get final |
722 | * vblank_time timestamp for end of vblank. | |
723 | */ | |
e91abf80 MD |
724 | if (delta_ns < 0) |
725 | etime = ktime_add_ns(etime, -delta_ns); | |
726 | else | |
727 | etime = ktime_sub_ns(etime, delta_ns); | |
e62f2f5a | 728 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 729 | |
bbb0aef5 JP |
730 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
731 | crtc, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 732 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 | 733 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
3c184f69 | 734 | duration_ns/1000, i); |
27641c3f MK |
735 | |
736 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
737 | if (invbl) | |
738 | vbl_status |= DRM_VBLANKTIME_INVBL; | |
739 | ||
740 | return vbl_status; | |
741 | } | |
742 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
743 | ||
c61eef72 ID |
744 | static struct timeval get_drm_timestamp(void) |
745 | { | |
746 | ktime_t now; | |
747 | ||
748 | now = ktime_get(); | |
749 | if (!drm_timestamp_monotonic) | |
750 | now = ktime_sub(now, ktime_get_monotonic_offset()); | |
751 | ||
752 | return ktime_to_timeval(now); | |
753 | } | |
754 | ||
27641c3f MK |
755 | /** |
756 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
f5752b38 | 757 | * vblank interval |
27641c3f | 758 | * @dev: DRM device |
f5752b38 | 759 | * @crtc: which CRTC's vblank timestamp to retrieve |
27641c3f MK |
760 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
761 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
762 | * 0 = Default, |
763 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
764 | * |
765 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 766 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
767 | * compute the timestamp with a high-precision GPU specific method. |
768 | * | |
769 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
770 | * call, i.e., it isn't very precisely locked to the true vblank. | |
771 | * | |
f5752b38 DV |
772 | * Returns: |
773 | * Non-zero if timestamp is considered to be very precise, zero otherwise. | |
27641c3f MK |
774 | */ |
775 | u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
776 | struct timeval *tvblank, unsigned flags) | |
777 | { | |
4a1b0714 | 778 | int ret; |
27641c3f MK |
779 | |
780 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
781 | int max_error = (int) drm_timestamp_precision * 1000; | |
782 | ||
783 | /* Query driver if possible and precision timestamping enabled. */ | |
784 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
785 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
786 | tvblank, flags); | |
787 | if (ret > 0) | |
788 | return (u32) ret; | |
789 | } | |
790 | ||
791 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 792 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 793 | */ |
c61eef72 | 794 | *tvblank = get_drm_timestamp(); |
27641c3f MK |
795 | |
796 | return 0; | |
797 | } | |
798 | EXPORT_SYMBOL(drm_get_last_vbltimestamp); | |
799 | ||
0a3e67a4 JB |
800 | /** |
801 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
802 | * @dev: DRM device | |
803 | * @crtc: which counter to retrieve | |
804 | * | |
805 | * Fetches the "cooked" vblank count value that represents the number of | |
806 | * vblank events since the system was booted, including lost events due to | |
807 | * modesetting activity. | |
f5752b38 DV |
808 | * |
809 | * Returns: | |
810 | * The software vblank counter. | |
0a3e67a4 JB |
811 | */ |
812 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
813 | { | |
8a51d5be VS |
814 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
815 | ||
816 | return atomic_read(&vblank->count); | |
0a3e67a4 JB |
817 | } |
818 | EXPORT_SYMBOL(drm_vblank_count); | |
819 | ||
27641c3f MK |
820 | /** |
821 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
822 | * and the system timestamp corresponding to that vblank counter value. | |
823 | * | |
824 | * @dev: DRM device | |
825 | * @crtc: which counter to retrieve | |
826 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
827 | * | |
828 | * Fetches the "cooked" vblank count value that represents the number of | |
829 | * vblank events since the system was booted, including lost events due to | |
830 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 831 | * of the vblank interval that corresponds to the current vblank counter value. |
27641c3f MK |
832 | */ |
833 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
834 | struct timeval *vblanktime) | |
835 | { | |
8a51d5be | 836 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
837 | u32 cur_vblank; |
838 | ||
839 | /* Read timestamp from slot of _vblank_time ringbuffer | |
840 | * that corresponds to current vblank count. Retry if | |
841 | * count has incremented during readout. This works like | |
842 | * a seqlock. | |
843 | */ | |
844 | do { | |
8a51d5be | 845 | cur_vblank = atomic_read(&vblank->count); |
27641c3f MK |
846 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); |
847 | smp_rmb(); | |
8a51d5be | 848 | } while (cur_vblank != atomic_read(&vblank->count)); |
27641c3f MK |
849 | |
850 | return cur_vblank; | |
851 | } | |
852 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
853 | ||
c6eefa17 RC |
854 | static void send_vblank_event(struct drm_device *dev, |
855 | struct drm_pending_vblank_event *e, | |
856 | unsigned long seq, struct timeval *now) | |
857 | { | |
858 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
859 | e->event.sequence = seq; | |
860 | e->event.tv_sec = now->tv_sec; | |
861 | e->event.tv_usec = now->tv_usec; | |
862 | ||
863 | list_add_tail(&e->base.link, | |
864 | &e->base.file_priv->event_list); | |
865 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
866 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
867 | e->event.sequence); | |
868 | } | |
869 | ||
870 | /** | |
871 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
872 | * @dev: DRM device | |
873 | * @crtc: CRTC in question | |
874 | * @e: the event to send | |
875 | * | |
876 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
877 | * Caller must hold event lock. | |
878 | */ | |
879 | void drm_send_vblank_event(struct drm_device *dev, int crtc, | |
880 | struct drm_pending_vblank_event *e) | |
881 | { | |
882 | struct timeval now; | |
883 | unsigned int seq; | |
884 | if (crtc >= 0) { | |
885 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
886 | } else { | |
887 | seq = 0; | |
c61eef72 ID |
888 | |
889 | now = get_drm_timestamp(); | |
c6eefa17 | 890 | } |
21a245d2 | 891 | e->pipe = crtc; |
c6eefa17 RC |
892 | send_vblank_event(dev, e, seq, &now); |
893 | } | |
894 | EXPORT_SYMBOL(drm_send_vblank_event); | |
895 | ||
f2752282 VS |
896 | /** |
897 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
898 | * @dev: DRM device | |
899 | * @crtc: CRTC in question | |
900 | */ | |
901 | static int drm_vblank_enable(struct drm_device *dev, int crtc) | |
902 | { | |
8a51d5be | 903 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f2752282 VS |
904 | int ret = 0; |
905 | ||
906 | assert_spin_locked(&dev->vbl_lock); | |
907 | ||
908 | spin_lock(&dev->vblank_time_lock); | |
909 | ||
8a51d5be | 910 | if (!vblank->enabled) { |
1cfb80b1 DV |
911 | /* |
912 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
913 | * All vblank count & timestamp updates are held off |
914 | * until we are done reinitializing master counter and | |
915 | * timestamps. Filtercode in drm_handle_vblank() will | |
916 | * prevent double-accounting of same vblank interval. | |
917 | */ | |
918 | ret = dev->driver->enable_vblank(dev, crtc); | |
919 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); | |
920 | if (ret) | |
8a51d5be | 921 | atomic_dec(&vblank->refcount); |
f2752282 | 922 | else { |
8a51d5be | 923 | vblank->enabled = true; |
f2752282 VS |
924 | drm_update_vblank_count(dev, crtc); |
925 | } | |
926 | } | |
927 | ||
928 | spin_unlock(&dev->vblank_time_lock); | |
929 | ||
930 | return ret; | |
931 | } | |
932 | ||
0a3e67a4 JB |
933 | /** |
934 | * drm_vblank_get - get a reference count on vblank events | |
935 | * @dev: DRM device | |
936 | * @crtc: which CRTC to own | |
937 | * | |
938 | * Acquire a reference count on vblank events to avoid having them disabled | |
939 | * while in use. | |
940 | * | |
89dd6a4b DV |
941 | * This is the legacy version of drm_crtc_vblank_get(). |
942 | * | |
f5752b38 | 943 | * Returns: |
0a3e67a4 JB |
944 | * Zero on success, nonzero on failure. |
945 | */ | |
946 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
947 | { | |
8a51d5be | 948 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
97cbc883 | 949 | unsigned long irqflags; |
0a3e67a4 JB |
950 | int ret = 0; |
951 | ||
952 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
953 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 954 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
f2752282 | 955 | ret = drm_vblank_enable(dev, crtc); |
778c9026 | 956 | } else { |
8a51d5be VS |
957 | if (!vblank->enabled) { |
958 | atomic_dec(&vblank->refcount); | |
778c9026 | 959 | ret = -EINVAL; |
0a3e67a4 JB |
960 | } |
961 | } | |
962 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
963 | ||
964 | return ret; | |
965 | } | |
966 | EXPORT_SYMBOL(drm_vblank_get); | |
967 | ||
89dd6a4b DV |
968 | /** |
969 | * drm_crtc_vblank_get - get a reference count on vblank events | |
970 | * @crtc: which CRTC to own | |
971 | * | |
972 | * Acquire a reference count on vblank events to avoid having them disabled | |
973 | * while in use. | |
974 | * | |
975 | * This is the native kms version of drm_vblank_off(). | |
976 | * | |
977 | * Returns: | |
978 | * Zero on success, nonzero on failure. | |
979 | */ | |
980 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
981 | { | |
982 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
983 | } | |
984 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
985 | ||
0a3e67a4 JB |
986 | /** |
987 | * drm_vblank_put - give up ownership of vblank events | |
988 | * @dev: DRM device | |
989 | * @crtc: which counter to give up | |
990 | * | |
991 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 992 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
993 | * |
994 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 JB |
995 | */ |
996 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
997 | { | |
8a51d5be VS |
998 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
999 | ||
1000 | BUG_ON(atomic_read(&vblank->refcount) == 0); | |
b3f5e732 | 1001 | |
0a3e67a4 | 1002 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1003 | if (atomic_dec_and_test(&vblank->refcount)) { |
00185e66 | 1004 | if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) |
4ed0ce3d VS |
1005 | vblank_disable_fn((unsigned long)vblank); |
1006 | else if (drm_vblank_offdelay > 0) | |
1007 | mod_timer(&vblank->disable_timer, | |
1008 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1009 | } | |
0a3e67a4 JB |
1010 | } |
1011 | EXPORT_SYMBOL(drm_vblank_put); | |
1012 | ||
89dd6a4b DV |
1013 | /** |
1014 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1015 | * @crtc: which counter to give up | |
1016 | * | |
1017 | * Release ownership of a given vblank counter, turning off interrupts | |
1018 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1019 | * | |
1020 | * This is the native kms version of drm_vblank_put(). | |
1021 | */ | |
1022 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1023 | { | |
1024 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1025 | } | |
1026 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1027 | ||
c6eefa17 RC |
1028 | /** |
1029 | * drm_vblank_off - disable vblank events on a CRTC | |
1030 | * @dev: DRM device | |
1031 | * @crtc: CRTC in question | |
1032 | * | |
f5752b38 DV |
1033 | * Drivers can use this function to shut down the vblank interrupt handling when |
1034 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1035 | * stored so that drm_vblank_on() can restore it again. | |
1036 | * | |
1037 | * Drivers must use this function when the hardware vblank counter can get | |
1038 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1039 | * |
1040 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1041 | */ |
778c9026 LP |
1042 | void drm_vblank_off(struct drm_device *dev, int crtc) |
1043 | { | |
8a51d5be | 1044 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
498548ec CJHR |
1045 | struct drm_pending_vblank_event *e, *t; |
1046 | struct timeval now; | |
778c9026 | 1047 | unsigned long irqflags; |
498548ec | 1048 | unsigned int seq; |
778c9026 | 1049 | |
56cc279b VS |
1050 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1051 | ||
1052 | spin_lock(&dev->vbl_lock); | |
27641c3f | 1053 | vblank_disable_and_save(dev, crtc); |
8a51d5be | 1054 | wake_up(&vblank->queue); |
498548ec | 1055 | |
56cc279b VS |
1056 | /* |
1057 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1058 | * the vblank interrupt by bumping the refcount. | |
1059 | */ | |
1060 | if (!vblank->inmodeset) { | |
1061 | atomic_inc(&vblank->refcount); | |
1062 | vblank->inmodeset = 1; | |
1063 | } | |
1064 | spin_unlock(&dev->vbl_lock); | |
1065 | ||
498548ec CJHR |
1066 | /* Send any queued vblank events, lest the natives grow disquiet */ |
1067 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
e7783ba3 | 1068 | |
498548ec CJHR |
1069 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
1070 | if (e->pipe != crtc) | |
1071 | continue; | |
1072 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
1073 | wanted %d, current %d\n", | |
1074 | e->event.sequence, seq); | |
c6eefa17 | 1075 | list_del(&e->base.link); |
498548ec | 1076 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1077 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1078 | } |
56cc279b | 1079 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 LP |
1080 | } |
1081 | EXPORT_SYMBOL(drm_vblank_off); | |
1082 | ||
89dd6a4b DV |
1083 | /** |
1084 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1085 | * @crtc: CRTC in question | |
1086 | * | |
1087 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1088 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1089 | * stored so that drm_vblank_on can restore it again. | |
1090 | * | |
1091 | * Drivers must use this function when the hardware vblank counter can get | |
1092 | * reset, e.g. when suspending. | |
1093 | * | |
1094 | * This is the native kms version of drm_vblank_off(). | |
1095 | */ | |
1096 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1097 | { | |
1098 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1099 | } | |
1100 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1101 | ||
f2752282 VS |
1102 | /** |
1103 | * drm_vblank_on - enable vblank events on a CRTC | |
1104 | * @dev: DRM device | |
1105 | * @crtc: CRTC in question | |
f5752b38 DV |
1106 | * |
1107 | * This functions restores the vblank interrupt state captured with | |
1108 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
1109 | * drm_vblank_off() can be unbalanced and so can also be unconditionaly called | |
1110 | * in driver load code to reflect the current hardware state of the crtc. | |
89dd6a4b DV |
1111 | * |
1112 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 VS |
1113 | */ |
1114 | void drm_vblank_on(struct drm_device *dev, int crtc) | |
1115 | { | |
8a51d5be | 1116 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f2752282 VS |
1117 | unsigned long irqflags; |
1118 | ||
1119 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
7ffd7a68 | 1120 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1121 | if (vblank->inmodeset) { |
1122 | atomic_dec(&vblank->refcount); | |
1123 | vblank->inmodeset = 0; | |
7ffd7a68 | 1124 | } |
f8ad028c VS |
1125 | |
1126 | /* | |
1127 | * sample the current counter to avoid random jumps | |
1128 | * when drm_vblank_enable() applies the diff | |
1129 | * | |
1130 | * -1 to make sure user will never see the same | |
1131 | * vblank counter value before and after a modeset | |
1132 | */ | |
8a51d5be | 1133 | vblank->last = |
f8ad028c VS |
1134 | (dev->driver->get_vblank_counter(dev, crtc) - 1) & |
1135 | dev->max_vblank_count; | |
cd19e52a VS |
1136 | /* |
1137 | * re-enable interrupts if there are users left, or the | |
1138 | * user wishes vblank interrupts to be enabled all the time. | |
1139 | */ | |
1140 | if (atomic_read(&vblank->refcount) != 0 || | |
1141 | (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0)) | |
f2752282 VS |
1142 | WARN_ON(drm_vblank_enable(dev, crtc)); |
1143 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1144 | } | |
1145 | EXPORT_SYMBOL(drm_vblank_on); | |
1146 | ||
89dd6a4b DV |
1147 | /** |
1148 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1149 | * @crtc: CRTC in question | |
1150 | * | |
1151 | * This functions restores the vblank interrupt state captured with | |
1152 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
1153 | * drm_vblank_off() can be unbalanced and so can also be unconditionaly called | |
1154 | * in driver load code to reflect the current hardware state of the crtc. | |
1155 | * | |
1156 | * This is the native kms version of drm_vblank_on(). | |
1157 | */ | |
1158 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1159 | { | |
1160 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1161 | } | |
1162 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1163 | ||
f453ba04 DA |
1164 | /** |
1165 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1166 | * @dev: DRM device | |
1167 | * @crtc: CRTC in question | |
f453ba04 DA |
1168 | * |
1169 | * Account for vblank events across mode setting events, which will likely | |
1170 | * reset the hardware frame counter. | |
f5752b38 DV |
1171 | * |
1172 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1173 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1174 | * software-side vblank frame counting will ensure that there are no jumps or | |
1175 | * discontinuities. | |
1176 | * | |
1177 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1178 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1179 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1180 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1181 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1182 | * counters. | |
1183 | * | |
1184 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1185 | * again. | |
f453ba04 DA |
1186 | */ |
1187 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
1188 | { | |
8a51d5be VS |
1189 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
1190 | ||
b7ea85a4 | 1191 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1192 | if (!dev->num_crtcs) |
1193 | return; | |
f453ba04 DA |
1194 | /* |
1195 | * To avoid all the problems that might happen if interrupts | |
1196 | * were enabled/disabled around or between these calls, we just | |
1197 | * have the kernel take a reference on the CRTC (just once though | |
1198 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1199 | * so that interrupts remain enabled in the interim. | |
1200 | */ | |
8a51d5be VS |
1201 | if (!vblank->inmodeset) { |
1202 | vblank->inmodeset = 0x1; | |
b3f5e732 | 1203 | if (drm_vblank_get(dev, crtc) == 0) |
8a51d5be | 1204 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1205 | } |
1206 | } | |
1207 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1208 | ||
f5752b38 DV |
1209 | /** |
1210 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1211 | * @dev: DRM device | |
1212 | * @crtc: CRTC in question | |
1213 | * | |
1214 | * This function again drops the temporary vblank reference acquired in | |
1215 | * drm_vblank_pre_modeset. | |
1216 | */ | |
f453ba04 DA |
1217 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) |
1218 | { | |
8a51d5be | 1219 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f453ba04 DA |
1220 | unsigned long irqflags; |
1221 | ||
b7ea85a4 HC |
1222 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1223 | if (!dev->num_crtcs) | |
1224 | return; | |
1225 | ||
8a51d5be | 1226 | if (vblank->inmodeset) { |
f453ba04 | 1227 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
ba0bf120 | 1228 | dev->vblank_disable_allowed = true; |
f453ba04 | 1229 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1230 | |
8a51d5be | 1231 | if (vblank->inmodeset & 0x2) |
b3f5e732 CW |
1232 | drm_vblank_put(dev, crtc); |
1233 | ||
8a51d5be | 1234 | vblank->inmodeset = 0; |
f453ba04 DA |
1235 | } |
1236 | } | |
1237 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1238 | ||
f5752b38 | 1239 | /* |
0a3e67a4 JB |
1240 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1241 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1242 | * | |
1243 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1244 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1245 | * | |
1246 | * Generally the counter will reset across mode sets. If interrupts are | |
1247 | * enabled around this call, we don't have to do anything since the counter | |
1248 | * will have already been incremented. | |
1249 | */ | |
1250 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1251 | struct drm_file *file_priv) | |
1252 | { | |
1253 | struct drm_modeset_ctl *modeset = data; | |
19227561 | 1254 | unsigned int crtc; |
0a3e67a4 JB |
1255 | |
1256 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1257 | if (!dev->num_crtcs) | |
4a1b0714 | 1258 | return 0; |
0a3e67a4 | 1259 | |
29935554 LP |
1260 | /* KMS drivers handle this internally */ |
1261 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1262 | return 0; | |
1263 | ||
0a3e67a4 | 1264 | crtc = modeset->crtc; |
4a1b0714 LP |
1265 | if (crtc >= dev->num_crtcs) |
1266 | return -EINVAL; | |
0a3e67a4 | 1267 | |
0a3e67a4 JB |
1268 | switch (modeset->cmd) { |
1269 | case _DRM_PRE_MODESET: | |
f453ba04 | 1270 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1271 | break; |
1272 | case _DRM_POST_MODESET: | |
f453ba04 | 1273 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1274 | break; |
1275 | default: | |
4a1b0714 | 1276 | return -EINVAL; |
0a3e67a4 JB |
1277 | } |
1278 | ||
4a1b0714 | 1279 | return 0; |
0a3e67a4 JB |
1280 | } |
1281 | ||
c9a9c5e0 KH |
1282 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1283 | union drm_wait_vblank *vblwait, | |
1284 | struct drm_file *file_priv) | |
1285 | { | |
ffe7c73a | 1286 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1287 | struct drm_pending_vblank_event *e; |
1288 | struct timeval now; | |
1289 | unsigned long flags; | |
1290 | unsigned int seq; | |
ea5d552c | 1291 | int ret; |
c9a9c5e0 KH |
1292 | |
1293 | e = kzalloc(sizeof *e, GFP_KERNEL); | |
ea5d552c CW |
1294 | if (e == NULL) { |
1295 | ret = -ENOMEM; | |
1296 | goto err_put; | |
1297 | } | |
c9a9c5e0 KH |
1298 | |
1299 | e->pipe = pipe; | |
b9c2c9ae | 1300 | e->base.pid = current->pid; |
c9a9c5e0 KH |
1301 | e->event.base.type = DRM_EVENT_VBLANK; |
1302 | e->event.base.length = sizeof e->event; | |
1303 | e->event.user_data = vblwait->request.signal; | |
1304 | e->base.event = &e->event.base; | |
1305 | e->base.file_priv = file_priv; | |
1306 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1307 | ||
c9a9c5e0 KH |
1308 | spin_lock_irqsave(&dev->event_lock, flags); |
1309 | ||
ffe7c73a VS |
1310 | /* |
1311 | * drm_vblank_off() might have been called after we called | |
1312 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1313 | * around the vblank disable, so no need for further locking. | |
1314 | * The reference from drm_vblank_get() protects against | |
1315 | * vblank disable from another source. | |
1316 | */ | |
1317 | if (!vblank->enabled) { | |
1318 | ret = -EINVAL; | |
1319 | goto err_unlock; | |
1320 | } | |
1321 | ||
c9a9c5e0 | 1322 | if (file_priv->event_space < sizeof e->event) { |
ea5d552c CW |
1323 | ret = -EBUSY; |
1324 | goto err_unlock; | |
c9a9c5e0 KH |
1325 | } |
1326 | ||
1327 | file_priv->event_space -= sizeof e->event; | |
27641c3f MK |
1328 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1329 | ||
c9a9c5e0 KH |
1330 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1331 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1332 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1333 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1334 | } |
1335 | ||
1336 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1337 | vblwait->request.sequence, seq, pipe); | |
1338 | ||
b9c2c9ae JB |
1339 | trace_drm_vblank_event_queued(current->pid, pipe, |
1340 | vblwait->request.sequence); | |
1341 | ||
c9a9c5e0 KH |
1342 | e->event.sequence = vblwait->request.sequence; |
1343 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1344 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1345 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1346 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1347 | } else { |
a6778e9e | 1348 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1349 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1350 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1351 | } |
1352 | ||
1353 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1354 | ||
1355 | return 0; | |
ea5d552c CW |
1356 | |
1357 | err_unlock: | |
1358 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1359 | kfree(e); | |
1360 | err_put: | |
6f331623 | 1361 | drm_vblank_put(dev, pipe); |
ea5d552c | 1362 | return ret; |
c9a9c5e0 KH |
1363 | } |
1364 | ||
f5752b38 | 1365 | /* |
1da177e4 LT |
1366 | * Wait for VBLANK. |
1367 | * | |
1368 | * \param inode device inode. | |
6c340eac | 1369 | * \param file_priv DRM file private. |
1da177e4 LT |
1370 | * \param cmd command. |
1371 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1372 | * \return zero on success or a negative number on failure. | |
1373 | * | |
30b23634 EA |
1374 | * This function enables the vblank interrupt on the pipe requested, then |
1375 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1376 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1377 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1378 | */ |
0a3e67a4 JB |
1379 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1380 | struct drm_file *file_priv) | |
1da177e4 | 1381 | { |
8a51d5be | 1382 | struct drm_vblank_crtc *vblank; |
c153f45f | 1383 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1384 | int ret; |
19b01b5f | 1385 | unsigned int flags, seq, crtc, high_crtc; |
1da177e4 | 1386 | |
4984979b DV |
1387 | if (!dev->irq_enabled) |
1388 | return -EINVAL; | |
1da177e4 | 1389 | |
30b23634 EA |
1390 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1391 | return -EINVAL; | |
1392 | ||
c153f45f | 1393 | if (vblwait->request.type & |
19b01b5f IH |
1394 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1395 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1396 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1397 | vblwait->request.type, |
19b01b5f IH |
1398 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1399 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MCA |
1400 | return -EINVAL; |
1401 | } | |
1402 | ||
c153f45f | 1403 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
19b01b5f IH |
1404 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1405 | if (high_crtc) | |
1406 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1407 | else | |
1408 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
0a3e67a4 | 1409 | if (crtc >= dev->num_crtcs) |
776c9443 MCA |
1410 | return -EINVAL; |
1411 | ||
8a51d5be VS |
1412 | vblank = &dev->vblank[crtc]; |
1413 | ||
0a3e67a4 JB |
1414 | ret = drm_vblank_get(dev, crtc); |
1415 | if (ret) { | |
8d3457ec | 1416 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1417 | return ret; |
1418 | } | |
1419 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1420 | |
c153f45f | 1421 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1422 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1423 | vblwait->request.sequence += seq; |
1424 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1425 | case _DRM_VBLANK_ABSOLUTE: |
1426 | break; | |
1427 | default: | |
0a3e67a4 JB |
1428 | ret = -EINVAL; |
1429 | goto done; | |
1da177e4 LT |
1430 | } |
1431 | ||
a6778e9e IH |
1432 | if (flags & _DRM_VBLANK_EVENT) { |
1433 | /* must hold on to the vblank ref until the event fires | |
1434 | * drm_vblank_put will be called asynchronously | |
1435 | */ | |
c9a9c5e0 | 1436 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); |
a6778e9e | 1437 | } |
c9a9c5e0 | 1438 | |
ab285d74 | 1439 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1440 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1441 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
1442 | } |
1443 | ||
30b23634 EA |
1444 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1445 | vblwait->request.sequence, crtc); | |
8a51d5be VS |
1446 | vblank->last_wait = vblwait->request.sequence; |
1447 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
30b23634 EA |
1448 | (((drm_vblank_count(dev, crtc) - |
1449 | vblwait->request.sequence) <= (1 << 23)) || | |
8a51d5be | 1450 | !vblank->enabled || |
30b23634 | 1451 | !dev->irq_enabled)); |
1da177e4 | 1452 | |
30b23634 EA |
1453 | if (ret != -EINTR) { |
1454 | struct timeval now; | |
1da177e4 | 1455 | |
27641c3f | 1456 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1457 | vblwait->reply.tval_sec = now.tv_sec; |
1458 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1459 | |
30b23634 EA |
1460 | DRM_DEBUG("returning %d to client\n", |
1461 | vblwait->reply.sequence); | |
1da177e4 | 1462 | } else { |
30b23634 | 1463 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1464 | } |
1465 | ||
0a3e67a4 JB |
1466 | done: |
1467 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1468 | return ret; |
1469 | } | |
1470 | ||
ea7f7abc | 1471 | static void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
c9a9c5e0 KH |
1472 | { |
1473 | struct drm_pending_vblank_event *e, *t; | |
1474 | struct timeval now; | |
c9a9c5e0 KH |
1475 | unsigned int seq; |
1476 | ||
56cc279b | 1477 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1478 | |
56cc279b | 1479 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1480 | |
1481 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1482 | if (e->pipe != crtc) | |
1483 | continue; | |
1484 | if ((seq - e->event.sequence) > (1<<23)) | |
1485 | continue; | |
1486 | ||
1487 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1488 | e->event.sequence, seq); | |
1489 | ||
c6eefa17 | 1490 | list_del(&e->base.link); |
c9a9c5e0 | 1491 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1492 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1493 | } |
1494 | ||
ac2874b9 | 1495 | trace_drm_vblank_event(crtc, seq); |
c9a9c5e0 KH |
1496 | } |
1497 | ||
0a3e67a4 JB |
1498 | /** |
1499 | * drm_handle_vblank - handle a vblank event | |
1500 | * @dev: DRM device | |
1501 | * @crtc: where this event occurred | |
1502 | * | |
1503 | * Drivers should call this routine in their vblank interrupt handlers to | |
1504 | * update the vblank counter and send any signals that may be pending. | |
1505 | */ | |
78c6e170 | 1506 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1507 | { |
8a51d5be | 1508 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
1509 | u32 vblcount; |
1510 | s64 diff_ns; | |
1511 | struct timeval tvblank; | |
1512 | unsigned long irqflags; | |
1513 | ||
c9a9c5e0 | 1514 | if (!dev->num_crtcs) |
78c6e170 | 1515 | return false; |
c9a9c5e0 | 1516 | |
56cc279b VS |
1517 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1518 | ||
27641c3f MK |
1519 | /* Need timestamp lock to prevent concurrent execution with |
1520 | * vblank enable/disable, as this would cause inconsistent | |
1521 | * or corrupted timestamps and vblank counts. | |
1522 | */ | |
56cc279b | 1523 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1524 | |
1525 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1526 | if (!vblank->enabled) { |
56cc279b VS |
1527 | spin_unlock(&dev->vblank_time_lock); |
1528 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1529 | return false; |
27641c3f MK |
1530 | } |
1531 | ||
1532 | /* Fetch corresponding timestamp for this vblank interval from | |
1533 | * driver and store it in proper slot of timestamp ringbuffer. | |
1534 | */ | |
1535 | ||
1536 | /* Get current timestamp and count. */ | |
8a51d5be | 1537 | vblcount = atomic_read(&vblank->count); |
27641c3f MK |
1538 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); |
1539 | ||
1540 | /* Compute time difference to timestamp of last vblank */ | |
1541 | diff_ns = timeval_to_ns(&tvblank) - | |
1542 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1543 | ||
1544 | /* Update vblank timestamp and count if at least | |
1545 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1546 | * difference between last stored timestamp and current | |
1547 | * timestamp. A smaller difference means basically | |
1548 | * identical timestamps. Happens if this vblank has | |
1549 | * been already processed and this is a redundant call, | |
1550 | * e.g., due to spurious vblank interrupts. We need to | |
1551 | * ignore those for accounting. | |
1552 | */ | |
c4cc3839 | 1553 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { |
27641c3f MK |
1554 | /* Store new timestamp in ringbuffer. */ |
1555 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
27641c3f MK |
1556 | |
1557 | /* Increment cooked vblank count. This also atomically commits | |
1558 | * the timestamp computed above. | |
1559 | */ | |
4e857c58 | 1560 | smp_mb__before_atomic(); |
8a51d5be | 1561 | atomic_inc(&vblank->count); |
4e857c58 | 1562 | smp_mb__after_atomic(); |
27641c3f MK |
1563 | } else { |
1564 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", | |
1565 | crtc, (int) diff_ns); | |
1566 | } | |
1567 | ||
56cc279b VS |
1568 | spin_unlock(&dev->vblank_time_lock); |
1569 | ||
8a51d5be | 1570 | wake_up(&vblank->queue); |
c9a9c5e0 | 1571 | drm_handle_vblank_events(dev, crtc); |
27641c3f | 1572 | |
56cc279b VS |
1573 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1574 | ||
78c6e170 | 1575 | return true; |
0a3e67a4 JB |
1576 | } |
1577 | EXPORT_SYMBOL(drm_handle_vblank); |