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 | ||
27641c3f MK |
58 | /* |
59 | * Clear vblank timestamp buffer for a crtc. | |
60 | */ | |
61 | static void clear_vblank_timestamps(struct drm_device *dev, int crtc) | |
62 | { | |
5380e929 | 63 | memset(dev->vblank[crtc].time, 0, sizeof(dev->vblank[crtc].time)); |
27641c3f MK |
64 | } |
65 | ||
66 | /* | |
67 | * Disable vblank irq's on crtc, make sure that last vblank count | |
68 | * of hardware and corresponding consistent software vblank counter | |
69 | * are preserved, even if there are any spurious vblank irq's after | |
70 | * disable. | |
71 | */ | |
72 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
73 | { | |
74 | unsigned long irqflags; | |
75 | u32 vblcount; | |
76 | s64 diff_ns; | |
77 | int vblrc; | |
78 | struct timeval tvblank; | |
0355cf3a | 79 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
80 | |
81 | /* Prevent vblank irq processing while disabling vblank irqs, | |
82 | * so no updates of timestamps or count can happen after we've | |
83 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 84 | */ |
27641c3f MK |
85 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
86 | ||
87 | dev->driver->disable_vblank(dev, crtc); | |
5380e929 | 88 | dev->vblank[crtc].enabled = false; |
27641c3f MK |
89 | |
90 | /* No further vblank irq's will be processed after | |
91 | * this point. Get current hardware vblank count and | |
92 | * vblank timestamp, repeat until they are consistent. | |
93 | * | |
94 | * FIXME: There is still a race condition here and in | |
95 | * drm_update_vblank_count() which can cause off-by-one | |
96 | * reinitialization of software vblank counter. If gpu | |
97 | * vblank counter doesn't increment exactly at the leading | |
98 | * edge of a vblank interval, then we can lose 1 count if | |
99 | * we happen to execute between start of vblank and the | |
100 | * delayed gpu counter increment. | |
101 | */ | |
102 | do { | |
5380e929 | 103 | dev->vblank[crtc].last = dev->driver->get_vblank_counter(dev, crtc); |
27641c3f | 104 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); |
5380e929 | 105 | } while (dev->vblank[crtc].last != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc); |
0355cf3a EE |
106 | |
107 | if (!count) | |
108 | vblrc = 0; | |
27641c3f MK |
109 | |
110 | /* Compute time difference to stored timestamp of last vblank | |
111 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
112 | */ | |
5380e929 | 113 | vblcount = atomic_read(&dev->vblank[crtc].count); |
27641c3f MK |
114 | diff_ns = timeval_to_ns(&tvblank) - |
115 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
116 | ||
117 | /* If there is at least 1 msec difference between the last stored | |
118 | * timestamp and tvblank, then we are currently executing our | |
119 | * disable inside a new vblank interval, the tvblank timestamp | |
120 | * corresponds to this new vblank interval and the irq handler | |
121 | * for this vblank didn't run yet and won't run due to our disable. | |
122 | * Therefore we need to do the job of drm_handle_vblank() and | |
123 | * increment the vblank counter by one to account for this vblank. | |
124 | * | |
125 | * Skip this step if there isn't any high precision timestamp | |
126 | * available. In that case we can't account for this and just | |
127 | * hope for the best. | |
128 | */ | |
bc215128 | 129 | if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) { |
5380e929 | 130 | atomic_inc(&dev->vblank[crtc].count); |
4e857c58 | 131 | smp_mb__after_atomic(); |
bc215128 | 132 | } |
27641c3f MK |
133 | |
134 | /* Invalidate all timestamps while vblank irq's are off. */ | |
135 | clear_vblank_timestamps(dev, crtc); | |
136 | ||
137 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
27641c3f MK |
138 | } |
139 | ||
0a3e67a4 JB |
140 | static void vblank_disable_fn(unsigned long arg) |
141 | { | |
e69595c2 VS |
142 | struct drm_vblank_crtc *vblank = (void *)arg; |
143 | struct drm_device *dev = vblank->dev; | |
0a3e67a4 | 144 | unsigned long irqflags; |
e69595c2 | 145 | int crtc = vblank->crtc; |
0a3e67a4 JB |
146 | |
147 | if (!dev->vblank_disable_allowed) | |
148 | return; | |
149 | ||
e69595c2 VS |
150 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
151 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
152 | DRM_DEBUG("disabling vblank on crtc %d\n", crtc); | |
153 | vblank_disable_and_save(dev, crtc); | |
0a3e67a4 | 154 | } |
e69595c2 | 155 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
156 | } |
157 | ||
f5752b38 DV |
158 | /** |
159 | * drm_vblank_cleanup - cleanup vblank support | |
160 | * @dev: DRM device | |
161 | * | |
162 | * This function cleans up any resources allocated in drm_vblank_init. | |
163 | */ | |
52440211 | 164 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 165 | { |
e69595c2 VS |
166 | int crtc; |
167 | ||
0a3e67a4 JB |
168 | /* Bail if the driver didn't call drm_vblank_init() */ |
169 | if (dev->num_crtcs == 0) | |
170 | return; | |
171 | ||
e69595c2 VS |
172 | for (crtc = 0; crtc < dev->num_crtcs; crtc++) { |
173 | del_timer_sync(&dev->vblank[crtc].disable_timer); | |
174 | vblank_disable_fn((unsigned long)&dev->vblank[crtc]); | |
175 | } | |
0a3e67a4 | 176 | |
5380e929 | 177 | kfree(dev->vblank); |
0a3e67a4 JB |
178 | |
179 | dev->num_crtcs = 0; | |
180 | } | |
e77cef9c | 181 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 182 | |
f5752b38 DV |
183 | /** |
184 | * drm_vblank_init - initialize vblank support | |
185 | * @dev: drm_device | |
186 | * @num_crtcs: number of crtcs supported by @dev | |
187 | * | |
188 | * This function initializes vblank support for @num_crtcs display pipelines. | |
189 | * | |
190 | * Returns: | |
191 | * Zero on success or a negative error code on failure. | |
192 | */ | |
0a3e67a4 JB |
193 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) |
194 | { | |
195 | int i, ret = -ENOMEM; | |
196 | ||
0a3e67a4 | 197 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
198 | spin_lock_init(&dev->vblank_time_lock); |
199 | ||
0a3e67a4 JB |
200 | dev->num_crtcs = num_crtcs; |
201 | ||
5380e929 VS |
202 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
203 | if (!dev->vblank) | |
0a3e67a4 JB |
204 | goto err; |
205 | ||
e69595c2 VS |
206 | for (i = 0; i < num_crtcs; i++) { |
207 | dev->vblank[i].dev = dev; | |
208 | dev->vblank[i].crtc = i; | |
5380e929 | 209 | init_waitqueue_head(&dev->vblank[i].queue); |
e69595c2 VS |
210 | setup_timer(&dev->vblank[i].disable_timer, vblank_disable_fn, |
211 | (unsigned long)&dev->vblank[i]); | |
212 | } | |
27641c3f | 213 | |
8f6fce03 | 214 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
215 | |
216 | /* Driver specific high-precision vblank timestamping supported? */ | |
217 | if (dev->driver->get_vblank_timestamp) | |
218 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
219 | else | |
220 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
221 | ||
ba0bf120 VS |
222 | dev->vblank_disable_allowed = false; |
223 | ||
0a3e67a4 JB |
224 | return 0; |
225 | ||
226 | err: | |
227 | drm_vblank_cleanup(dev); | |
228 | return ret; | |
229 | } | |
230 | EXPORT_SYMBOL(drm_vblank_init); | |
231 | ||
28d52043 DA |
232 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
233 | { | |
234 | struct drm_device *dev = cookie; | |
235 | ||
236 | if (dev->driver->vgaarb_irq) { | |
237 | dev->driver->vgaarb_irq(dev, state); | |
238 | return; | |
239 | } | |
240 | ||
241 | if (!dev->irq_enabled) | |
242 | return; | |
243 | ||
5037f8ac JS |
244 | if (state) { |
245 | if (dev->driver->irq_uninstall) | |
246 | dev->driver->irq_uninstall(dev); | |
247 | } else { | |
248 | if (dev->driver->irq_preinstall) | |
249 | dev->driver->irq_preinstall(dev); | |
250 | if (dev->driver->irq_postinstall) | |
251 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
252 | } |
253 | } | |
254 | ||
1da177e4 | 255 | /** |
f5752b38 DV |
256 | * drm_irq_install - install IRQ handler |
257 | * @dev: DRM device | |
258 | * @irq: IRQ number to install the handler for | |
1da177e4 | 259 | * |
0a3e67a4 | 260 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
261 | * irq_preinstall() and irq_postinstall() functions before and after the |
262 | * installation. | |
263 | * | |
264 | * This is the simplified helper interface provided for drivers with no special | |
265 | * needs. Drivers which need to install interrupt handlers for multiple | |
266 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
267 | * that vblank interrupts are available. | |
268 | * | |
269 | * Returns: | |
270 | * Zero on success or a negative error code on failure. | |
1da177e4 | 271 | */ |
bb0f1b5c | 272 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 273 | { |
4a1b0714 | 274 | int ret; |
b5e89ed5 | 275 | unsigned long sh_flags = 0; |
1da177e4 LT |
276 | |
277 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
278 | return -EINVAL; | |
279 | ||
7c1a38e3 | 280 | if (irq == 0) |
1da177e4 LT |
281 | return -EINVAL; |
282 | ||
1da177e4 | 283 | /* Driver must have been initialized */ |
e090c53b | 284 | if (!dev->dev_private) |
1da177e4 | 285 | return -EINVAL; |
1da177e4 | 286 | |
e090c53b | 287 | if (dev->irq_enabled) |
1da177e4 | 288 | return -EBUSY; |
4423843c | 289 | dev->irq_enabled = true; |
1da177e4 | 290 | |
7c1a38e3 | 291 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 292 | |
b5e89ed5 | 293 | /* Before installing handler */ |
5037f8ac JS |
294 | if (dev->driver->irq_preinstall) |
295 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 296 | |
b5e89ed5 | 297 | /* Install handler */ |
1da177e4 | 298 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 299 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 300 | |
7c1a38e3 | 301 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 302 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 303 | |
b5e89ed5 | 304 | if (ret < 0) { |
4423843c | 305 | dev->irq_enabled = false; |
1da177e4 LT |
306 | return ret; |
307 | } | |
308 | ||
28d52043 DA |
309 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
310 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
311 | ||
b5e89ed5 | 312 | /* After installing handler */ |
5037f8ac JS |
313 | if (dev->driver->irq_postinstall) |
314 | ret = dev->driver->irq_postinstall(dev); | |
315 | ||
0a3e67a4 | 316 | if (ret < 0) { |
4423843c | 317 | dev->irq_enabled = false; |
e1c44acc JS |
318 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
319 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
7c1a38e3 DV |
320 | free_irq(irq, dev); |
321 | } else { | |
322 | dev->irq = irq; | |
0a3e67a4 | 323 | } |
1da177e4 | 324 | |
0a3e67a4 | 325 | return ret; |
1da177e4 | 326 | } |
0a3e67a4 | 327 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
328 | |
329 | /** | |
f5752b38 DV |
330 | * drm_irq_uninstall - uninstall the IRQ handler |
331 | * @dev: DRM device | |
332 | * | |
333 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
334 | * This should only be called by drivers which used drm_irq_install() to set up | |
335 | * their interrupt handler. Other drivers must only reset | |
336 | * drm_device->irq_enabled to false. | |
1da177e4 | 337 | * |
f5752b38 DV |
338 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
339 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
340 | * the same function through an ioctl. | |
1da177e4 | 341 | * |
f5752b38 DV |
342 | * Returns: |
343 | * Zero on success or a negative error code on failure. | |
1da177e4 | 344 | */ |
27641c3f | 345 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 346 | { |
dc1336ff | 347 | unsigned long irqflags; |
4423843c VS |
348 | bool irq_enabled; |
349 | int i; | |
1da177e4 LT |
350 | |
351 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
352 | return -EINVAL; | |
353 | ||
1da177e4 | 354 | irq_enabled = dev->irq_enabled; |
4423843c | 355 | dev->irq_enabled = false; |
1da177e4 | 356 | |
dc1336ff JB |
357 | /* |
358 | * Wake up any waiters so they don't hang. | |
359 | */ | |
bde4889a BS |
360 | if (dev->num_crtcs) { |
361 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
362 | for (i = 0; i < dev->num_crtcs; i++) { | |
57ed0f7b | 363 | wake_up(&dev->vblank[i].queue); |
5380e929 VS |
364 | dev->vblank[i].enabled = false; |
365 | dev->vblank[i].last = | |
bde4889a BS |
366 | dev->driver->get_vblank_counter(dev, i); |
367 | } | |
368 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 369 | } |
dc1336ff | 370 | |
b5e89ed5 | 371 | if (!irq_enabled) |
1da177e4 LT |
372 | return -EINVAL; |
373 | ||
7c1a38e3 | 374 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 375 | |
28d52043 DA |
376 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
377 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
378 | ||
5037f8ac JS |
379 | if (dev->driver->irq_uninstall) |
380 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 381 | |
7c1a38e3 | 382 | free_irq(dev->irq, dev); |
1da177e4 LT |
383 | |
384 | return 0; | |
385 | } | |
386 | EXPORT_SYMBOL(drm_irq_uninstall); | |
387 | ||
f5752b38 | 388 | /* |
1da177e4 LT |
389 | * IRQ control ioctl. |
390 | * | |
391 | * \param inode device inode. | |
6c340eac | 392 | * \param file_priv DRM file private. |
1da177e4 LT |
393 | * \param cmd command. |
394 | * \param arg user argument, pointing to a drm_control structure. | |
395 | * \return zero on success or a negative number on failure. | |
396 | * | |
397 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
398 | */ | |
c153f45f EA |
399 | int drm_control(struct drm_device *dev, void *data, |
400 | struct drm_file *file_priv) | |
1da177e4 | 401 | { |
c153f45f | 402 | struct drm_control *ctl = data; |
a319c1a4 | 403 | int ret = 0, irq; |
b5e89ed5 | 404 | |
27641c3f MK |
405 | /* if we haven't irq we fallback for compatibility reasons - |
406 | * this used to be a separate function in drm_dma.h | |
407 | */ | |
1da177e4 | 408 | |
22471cf6 DV |
409 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
410 | return 0; | |
411 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
412 | return 0; | |
413 | /* UMS was only ever support on pci devices. */ | |
414 | if (WARN_ON(!dev->pdev)) | |
415 | return -EINVAL; | |
1da177e4 | 416 | |
c153f45f | 417 | switch (ctl->func) { |
1da177e4 | 418 | case DRM_INST_HANDLER: |
a319c1a4 DV |
419 | irq = dev->pdev->irq; |
420 | ||
1da177e4 | 421 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 422 | ctl->irq != irq) |
1da177e4 | 423 | return -EINVAL; |
e090c53b | 424 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 425 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
426 | mutex_unlock(&dev->struct_mutex); |
427 | ||
428 | return ret; | |
1da177e4 | 429 | case DRM_UNINST_HANDLER: |
e090c53b DV |
430 | mutex_lock(&dev->struct_mutex); |
431 | ret = drm_irq_uninstall(dev); | |
432 | mutex_unlock(&dev->struct_mutex); | |
433 | ||
434 | return ret; | |
1da177e4 LT |
435 | default: |
436 | return -EINVAL; | |
437 | } | |
438 | } | |
439 | ||
27641c3f | 440 | /** |
f5752b38 DV |
441 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
442 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
443 | * @mode: display mode containing the scanout timings | |
27641c3f | 444 | * |
21b21560 VS |
445 | * Calculate and store various constants which are later |
446 | * needed by vblank and swap-completion timestamping, e.g, | |
447 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 448 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 449 | * things like panel scaling or other adjustments into account. |
27641c3f | 450 | */ |
545cdd55 VS |
451 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
452 | const struct drm_display_mode *mode) | |
27641c3f | 453 | { |
3c184f69 | 454 | int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; |
77666b72 | 455 | int dotclock = mode->crtc_clock; |
27641c3f MK |
456 | |
457 | /* Valid dotclock? */ | |
458 | if (dotclock > 0) { | |
0dae35a3 VS |
459 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
460 | ||
461 | /* | |
462 | * Convert scanline length in pixels and video | |
463 | * dot clock to line duration, frame duration | |
464 | * and pixel duration in nanoseconds: | |
27641c3f | 465 | */ |
0dae35a3 VS |
466 | pixeldur_ns = 1000000 / dotclock; |
467 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
468 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
469 | |
470 | /* | |
471 | * Fields of interlaced scanout modes are only half a frame duration. | |
472 | */ | |
473 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
474 | framedur_ns /= 2; | |
27641c3f MK |
475 | } else |
476 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", | |
477 | crtc->base.id); | |
478 | ||
479 | crtc->pixeldur_ns = pixeldur_ns; | |
480 | crtc->linedur_ns = linedur_ns; | |
481 | crtc->framedur_ns = framedur_ns; | |
482 | ||
483 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
545cdd55 VS |
484 | crtc->base.id, mode->crtc_htotal, |
485 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
27641c3f | 486 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", |
3c184f69 VS |
487 | crtc->base.id, dotclock, framedur_ns, |
488 | linedur_ns, pixeldur_ns); | |
27641c3f MK |
489 | } |
490 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
491 | ||
492 | /** | |
f5752b38 DV |
493 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
494 | * @dev: DRM device | |
495 | * @crtc: Which CRTC's vblank timestamp to retrieve | |
496 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
497 | * On return contains true maximum error of timestamp | |
498 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
499 | * @flags: Flags to pass to driver: | |
500 | * 0 = Default, | |
501 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
502 | * @refcrtc: CRTC which defines scanout timing | |
503 | * @mode: mode which defines the scanout timings | |
504 | * | |
505 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
506 | * timings and current video scanout position of a CRTC. This can be called from | |
507 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
508 | * actual timestamping. | |
27641c3f MK |
509 | * |
510 | * Should return timestamps conforming to the OML_sync_control OpenML | |
511 | * extension specification. The timestamp corresponds to the end of | |
512 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
513 | * pixel in the following video frame. | |
514 | * | |
515 | * Requires support for optional dev->driver->get_scanout_position() | |
516 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
517 | * that corresponds to the true scanout timing. | |
518 | * | |
519 | * The current implementation only handles standard video modes. It | |
520 | * returns as no operation if a doublescan or interlaced video mode is | |
521 | * active. Higher level code is expected to handle this. | |
522 | * | |
f5752b38 DV |
523 | * Returns: |
524 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
525 | * video mode: |
526 | * | |
f5752b38 | 527 | * -EINVAL - Invalid CRTC. |
27641c3f MK |
528 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
529 | * -ENOTSUPP - Function not supported in current display mode. | |
530 | * -EIO - Failed, e.g., due to failed scanout position query. | |
531 | * | |
532 | * Returns or'ed positive status flags on success: | |
533 | * | |
534 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
535 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
536 | * | |
537 | */ | |
538 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, | |
539 | int *max_error, | |
540 | struct timeval *vblank_time, | |
541 | unsigned flags, | |
7da903ef VS |
542 | const struct drm_crtc *refcrtc, |
543 | const struct drm_display_mode *mode) | |
27641c3f | 544 | { |
e62f2f5a | 545 | struct timeval tv_etime; |
d2cb58c8 | 546 | ktime_t stime, etime; |
8072bfa6 | 547 | int vbl_status; |
27641c3f | 548 | int vpos, hpos, i; |
3c184f69 | 549 | int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; |
27641c3f MK |
550 | bool invbl; |
551 | ||
552 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
553 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
554 | return -EINVAL; | |
555 | } | |
556 | ||
557 | /* Scanout position query not supported? Should not happen. */ | |
558 | if (!dev->driver->get_scanout_position) { | |
559 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
560 | return -EIO; | |
561 | } | |
562 | ||
27641c3f MK |
563 | /* Durations of frames, lines, pixels in nanoseconds. */ |
564 | framedur_ns = refcrtc->framedur_ns; | |
565 | linedur_ns = refcrtc->linedur_ns; | |
566 | pixeldur_ns = refcrtc->pixeldur_ns; | |
567 | ||
568 | /* If mode timing undefined, just return as no-op: | |
569 | * Happens during initial modesetting of a crtc. | |
570 | */ | |
8072bfa6 | 571 | if (framedur_ns == 0) { |
27641c3f MK |
572 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); |
573 | return -EAGAIN; | |
574 | } | |
575 | ||
27641c3f MK |
576 | /* Get current scanout position with system timestamp. |
577 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
578 | * if single query takes longer than max_error nanoseconds. | |
579 | * | |
580 | * This guarantees a tight bound on maximum error if | |
581 | * code gets preempted or delayed for some reason. | |
582 | */ | |
583 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
584 | /* |
585 | * Get vertical and horizontal scanout position vpos, hpos, | |
586 | * and bounding timestamps stime, etime, pre/post query. | |
587 | */ | |
abca9e45 | 588 | vbl_status = dev->driver->get_scanout_position(dev, crtc, flags, &vpos, |
8f6fce03 | 589 | &hpos, &stime, &etime); |
27641c3f | 590 | |
27641c3f MK |
591 | /* Return as no-op if scanout query unsupported or failed. */ |
592 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
593 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
594 | crtc, vbl_status); | |
595 | return -EIO; | |
596 | } | |
597 | ||
8f6fce03 | 598 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 599 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
600 | |
601 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 602 | if (duration_ns <= *max_error) |
27641c3f MK |
603 | break; |
604 | } | |
605 | ||
606 | /* Noisy system timing? */ | |
607 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
608 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
3c184f69 | 609 | crtc, duration_ns/1000, *max_error/1000, i); |
27641c3f MK |
610 | } |
611 | ||
612 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 613 | *max_error = duration_ns; |
27641c3f MK |
614 | |
615 | /* Check if in vblank area: | |
616 | * vpos is >=0 in video scanout area, but negative | |
617 | * within vblank area, counting down the number of lines until | |
618 | * start of scanout. | |
619 | */ | |
620 | invbl = vbl_status & DRM_SCANOUTPOS_INVBL; | |
621 | ||
622 | /* Convert scanout position into elapsed time at raw_time query | |
623 | * since start of scanout at first display scanline. delta_ns | |
624 | * can be negative if start of scanout hasn't happened yet. | |
625 | */ | |
3c184f69 | 626 | delta_ns = vpos * linedur_ns + hpos * pixeldur_ns; |
27641c3f | 627 | |
c61eef72 | 628 | if (!drm_timestamp_monotonic) |
d2cb58c8 | 629 | etime = ktime_mono_to_real(etime); |
c61eef72 | 630 | |
e62f2f5a ID |
631 | /* save this only for debugging purposes */ |
632 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
633 | /* Subtract time delta from raw timestamp to get final |
634 | * vblank_time timestamp for end of vblank. | |
635 | */ | |
e91abf80 MD |
636 | if (delta_ns < 0) |
637 | etime = ktime_add_ns(etime, -delta_ns); | |
638 | else | |
639 | etime = ktime_sub_ns(etime, delta_ns); | |
e62f2f5a | 640 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 641 | |
bbb0aef5 JP |
642 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
643 | crtc, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 644 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 | 645 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
3c184f69 | 646 | duration_ns/1000, i); |
27641c3f MK |
647 | |
648 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
649 | if (invbl) | |
650 | vbl_status |= DRM_VBLANKTIME_INVBL; | |
651 | ||
652 | return vbl_status; | |
653 | } | |
654 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
655 | ||
c61eef72 ID |
656 | static struct timeval get_drm_timestamp(void) |
657 | { | |
658 | ktime_t now; | |
659 | ||
d2cb58c8 | 660 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
c61eef72 ID |
661 | return ktime_to_timeval(now); |
662 | } | |
663 | ||
27641c3f MK |
664 | /** |
665 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
f5752b38 | 666 | * vblank interval |
27641c3f | 667 | * @dev: DRM device |
f5752b38 | 668 | * @crtc: which CRTC's vblank timestamp to retrieve |
27641c3f MK |
669 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
670 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
671 | * 0 = Default, |
672 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
673 | * |
674 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 675 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
676 | * compute the timestamp with a high-precision GPU specific method. |
677 | * | |
678 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
679 | * call, i.e., it isn't very precisely locked to the true vblank. | |
680 | * | |
f5752b38 DV |
681 | * Returns: |
682 | * Non-zero if timestamp is considered to be very precise, zero otherwise. | |
27641c3f MK |
683 | */ |
684 | u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
685 | struct timeval *tvblank, unsigned flags) | |
686 | { | |
4a1b0714 | 687 | int ret; |
27641c3f MK |
688 | |
689 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
690 | int max_error = (int) drm_timestamp_precision * 1000; | |
691 | ||
692 | /* Query driver if possible and precision timestamping enabled. */ | |
693 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
694 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
695 | tvblank, flags); | |
696 | if (ret > 0) | |
697 | return (u32) ret; | |
698 | } | |
699 | ||
700 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 701 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 702 | */ |
c61eef72 | 703 | *tvblank = get_drm_timestamp(); |
27641c3f MK |
704 | |
705 | return 0; | |
706 | } | |
707 | EXPORT_SYMBOL(drm_get_last_vbltimestamp); | |
708 | ||
0a3e67a4 JB |
709 | /** |
710 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
711 | * @dev: DRM device | |
712 | * @crtc: which counter to retrieve | |
713 | * | |
714 | * Fetches the "cooked" vblank count value that represents the number of | |
715 | * vblank events since the system was booted, including lost events due to | |
716 | * modesetting activity. | |
f5752b38 DV |
717 | * |
718 | * Returns: | |
719 | * The software vblank counter. | |
0a3e67a4 JB |
720 | */ |
721 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
722 | { | |
e6ae8687 RC |
723 | if (WARN_ON(crtc >= dev->num_crtcs)) |
724 | return 0; | |
5380e929 | 725 | return atomic_read(&dev->vblank[crtc].count); |
0a3e67a4 JB |
726 | } |
727 | EXPORT_SYMBOL(drm_vblank_count); | |
728 | ||
27641c3f MK |
729 | /** |
730 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
731 | * and the system timestamp corresponding to that vblank counter value. | |
732 | * | |
733 | * @dev: DRM device | |
734 | * @crtc: which counter to retrieve | |
735 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
736 | * | |
737 | * Fetches the "cooked" vblank count value that represents the number of | |
738 | * vblank events since the system was booted, including lost events due to | |
739 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 740 | * of the vblank interval that corresponds to the current vblank counter value. |
27641c3f MK |
741 | */ |
742 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
743 | struct timeval *vblanktime) | |
744 | { | |
745 | u32 cur_vblank; | |
746 | ||
e6ae8687 RC |
747 | if (WARN_ON(crtc >= dev->num_crtcs)) |
748 | return 0; | |
749 | ||
27641c3f MK |
750 | /* Read timestamp from slot of _vblank_time ringbuffer |
751 | * that corresponds to current vblank count. Retry if | |
752 | * count has incremented during readout. This works like | |
753 | * a seqlock. | |
754 | */ | |
755 | do { | |
5380e929 | 756 | cur_vblank = atomic_read(&dev->vblank[crtc].count); |
27641c3f MK |
757 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); |
758 | smp_rmb(); | |
5380e929 | 759 | } while (cur_vblank != atomic_read(&dev->vblank[crtc].count)); |
27641c3f MK |
760 | |
761 | return cur_vblank; | |
762 | } | |
763 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
764 | ||
c6eefa17 RC |
765 | static void send_vblank_event(struct drm_device *dev, |
766 | struct drm_pending_vblank_event *e, | |
767 | unsigned long seq, struct timeval *now) | |
768 | { | |
769 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
770 | e->event.sequence = seq; | |
771 | e->event.tv_sec = now->tv_sec; | |
772 | e->event.tv_usec = now->tv_usec; | |
773 | ||
774 | list_add_tail(&e->base.link, | |
775 | &e->base.file_priv->event_list); | |
776 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
777 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
778 | e->event.sequence); | |
779 | } | |
780 | ||
781 | /** | |
782 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
783 | * @dev: DRM device | |
784 | * @crtc: CRTC in question | |
785 | * @e: the event to send | |
786 | * | |
787 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
788 | * Caller must hold event lock. | |
789 | */ | |
790 | void drm_send_vblank_event(struct drm_device *dev, int crtc, | |
791 | struct drm_pending_vblank_event *e) | |
792 | { | |
793 | struct timeval now; | |
794 | unsigned int seq; | |
795 | if (crtc >= 0) { | |
796 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
797 | } else { | |
798 | seq = 0; | |
c61eef72 ID |
799 | |
800 | now = get_drm_timestamp(); | |
c6eefa17 | 801 | } |
21a245d2 | 802 | e->pipe = crtc; |
c6eefa17 RC |
803 | send_vblank_event(dev, e, seq, &now); |
804 | } | |
805 | EXPORT_SYMBOL(drm_send_vblank_event); | |
806 | ||
0a3e67a4 JB |
807 | /** |
808 | * drm_update_vblank_count - update the master vblank counter | |
809 | * @dev: DRM device | |
810 | * @crtc: counter to update | |
811 | * | |
812 | * Call back into the driver to update the appropriate vblank counter | |
813 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
814 | * update the last read value so we can deal with wraparound on the next | |
815 | * call if necessary. | |
816 | * | |
817 | * Only necessary when going from off->on, to account for frames we | |
818 | * didn't get an interrupt for. | |
819 | * | |
820 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
821 | * device vblank fields. | |
822 | */ | |
823 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
824 | { | |
27641c3f MK |
825 | u32 cur_vblank, diff, tslot, rc; |
826 | struct timeval t_vblank; | |
0a3e67a4 JB |
827 | |
828 | /* | |
829 | * Interrupts were disabled prior to this call, so deal with counter | |
830 | * wrap if needed. | |
831 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
832 | * here if the register is small or we had vblank interrupts off for | |
833 | * a long time. | |
27641c3f MK |
834 | * |
835 | * We repeat the hardware vblank counter & timestamp query until | |
836 | * we get consistent results. This to prevent races between gpu | |
837 | * updating its hardware counter while we are retrieving the | |
838 | * corresponding vblank timestamp. | |
0a3e67a4 | 839 | */ |
27641c3f MK |
840 | do { |
841 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
842 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
843 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
844 | ||
845 | /* Deal with counter wrap */ | |
5380e929 VS |
846 | diff = cur_vblank - dev->vblank[crtc].last; |
847 | if (cur_vblank < dev->vblank[crtc].last) { | |
0a3e67a4 JB |
848 | diff += dev->max_vblank_count; |
849 | ||
850 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
5380e929 | 851 | crtc, dev->vblank[crtc].last, cur_vblank, diff); |
0a3e67a4 JB |
852 | } |
853 | ||
854 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", | |
855 | crtc, diff); | |
856 | ||
27641c3f MK |
857 | /* Reinitialize corresponding vblank timestamp if high-precision query |
858 | * available. Skip this step if query unsupported or failed. Will | |
859 | * reinitialize delayed at next vblank interrupt in that case. | |
860 | */ | |
861 | if (rc) { | |
5380e929 | 862 | tslot = atomic_read(&dev->vblank[crtc].count) + diff; |
27641c3f | 863 | vblanktimestamp(dev, crtc, tslot) = t_vblank; |
27641c3f MK |
864 | } |
865 | ||
4e857c58 | 866 | smp_mb__before_atomic(); |
5380e929 | 867 | atomic_add(diff, &dev->vblank[crtc].count); |
4e857c58 | 868 | smp_mb__after_atomic(); |
0a3e67a4 JB |
869 | } |
870 | ||
f2752282 VS |
871 | /** |
872 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
873 | * @dev: DRM device | |
874 | * @crtc: CRTC in question | |
875 | */ | |
876 | static int drm_vblank_enable(struct drm_device *dev, int crtc) | |
877 | { | |
878 | int ret = 0; | |
879 | ||
880 | assert_spin_locked(&dev->vbl_lock); | |
881 | ||
882 | spin_lock(&dev->vblank_time_lock); | |
883 | ||
884 | if (!dev->vblank[crtc].enabled) { | |
1cfb80b1 DV |
885 | /* |
886 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
887 | * All vblank count & timestamp updates are held off |
888 | * until we are done reinitializing master counter and | |
889 | * timestamps. Filtercode in drm_handle_vblank() will | |
890 | * prevent double-accounting of same vblank interval. | |
891 | */ | |
892 | ret = dev->driver->enable_vblank(dev, crtc); | |
893 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); | |
894 | if (ret) | |
895 | atomic_dec(&dev->vblank[crtc].refcount); | |
896 | else { | |
897 | dev->vblank[crtc].enabled = true; | |
898 | drm_update_vblank_count(dev, crtc); | |
899 | } | |
900 | } | |
901 | ||
902 | spin_unlock(&dev->vblank_time_lock); | |
903 | ||
904 | return ret; | |
905 | } | |
906 | ||
0a3e67a4 JB |
907 | /** |
908 | * drm_vblank_get - get a reference count on vblank events | |
909 | * @dev: DRM device | |
910 | * @crtc: which CRTC to own | |
911 | * | |
912 | * Acquire a reference count on vblank events to avoid having them disabled | |
913 | * while in use. | |
914 | * | |
89dd6a4b DV |
915 | * This is the legacy version of drm_crtc_vblank_get(). |
916 | * | |
f5752b38 | 917 | * Returns: |
0a3e67a4 JB |
918 | * Zero on success, nonzero on failure. |
919 | */ | |
920 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
921 | { | |
97cbc883 | 922 | unsigned long irqflags; |
0a3e67a4 JB |
923 | int ret = 0; |
924 | ||
e6ae8687 RC |
925 | if (WARN_ON(crtc >= dev->num_crtcs)) |
926 | return -EINVAL; | |
927 | ||
0a3e67a4 JB |
928 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
929 | /* Going from 0->1 means we have to enable interrupts again */ | |
5380e929 | 930 | if (atomic_add_return(1, &dev->vblank[crtc].refcount) == 1) { |
f2752282 | 931 | ret = drm_vblank_enable(dev, crtc); |
778c9026 | 932 | } else { |
5380e929 VS |
933 | if (!dev->vblank[crtc].enabled) { |
934 | atomic_dec(&dev->vblank[crtc].refcount); | |
778c9026 | 935 | ret = -EINVAL; |
0a3e67a4 JB |
936 | } |
937 | } | |
938 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
939 | ||
940 | return ret; | |
941 | } | |
942 | EXPORT_SYMBOL(drm_vblank_get); | |
943 | ||
89dd6a4b DV |
944 | /** |
945 | * drm_crtc_vblank_get - get a reference count on vblank events | |
946 | * @crtc: which CRTC to own | |
947 | * | |
948 | * Acquire a reference count on vblank events to avoid having them disabled | |
949 | * while in use. | |
950 | * | |
951 | * This is the native kms version of drm_vblank_off(). | |
952 | * | |
953 | * Returns: | |
954 | * Zero on success, nonzero on failure. | |
955 | */ | |
956 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
957 | { | |
958 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
959 | } | |
960 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
961 | ||
0a3e67a4 JB |
962 | /** |
963 | * drm_vblank_put - give up ownership of vblank events | |
964 | * @dev: DRM device | |
965 | * @crtc: which counter to give up | |
966 | * | |
967 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 968 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
969 | * |
970 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 JB |
971 | */ |
972 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
973 | { | |
5380e929 | 974 | BUG_ON(atomic_read(&dev->vblank[crtc].refcount) == 0); |
b3f5e732 | 975 | |
e6ae8687 RC |
976 | if (WARN_ON(crtc >= dev->num_crtcs)) |
977 | return; | |
978 | ||
0a3e67a4 | 979 | /* Last user schedules interrupt disable */ |
5380e929 | 980 | if (atomic_dec_and_test(&dev->vblank[crtc].refcount) && |
27641c3f | 981 | (drm_vblank_offdelay > 0)) |
e69595c2 | 982 | mod_timer(&dev->vblank[crtc].disable_timer, |
bfd8303a | 983 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); |
0a3e67a4 JB |
984 | } |
985 | EXPORT_SYMBOL(drm_vblank_put); | |
986 | ||
89dd6a4b DV |
987 | /** |
988 | * drm_crtc_vblank_put - give up ownership of vblank events | |
989 | * @crtc: which counter to give up | |
990 | * | |
991 | * Release ownership of a given vblank counter, turning off interrupts | |
992 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
993 | * | |
994 | * This is the native kms version of drm_vblank_put(). | |
995 | */ | |
996 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
997 | { | |
998 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
999 | } | |
1000 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1001 | ||
e8450f51 DV |
1002 | /** |
1003 | * drm_wait_one_vblank - wait for one vblank | |
1004 | * @dev: DRM device | |
1005 | * @crtc: crtc index | |
1006 | * | |
1007 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1008 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1009 | * due to lack of driver support or because the crtc is off. | |
1010 | */ | |
1011 | void drm_wait_one_vblank(struct drm_device *dev, int crtc) | |
1012 | { | |
1013 | int ret; | |
1014 | u32 last; | |
1015 | ||
1016 | ret = drm_vblank_get(dev, crtc); | |
1017 | if (WARN_ON(ret)) | |
1018 | return; | |
1019 | ||
1020 | last = drm_vblank_count(dev, crtc); | |
1021 | ||
1022 | ret = wait_event_timeout(dev->vblank[crtc].queue, | |
1023 | last != drm_vblank_count(dev, crtc), | |
1024 | msecs_to_jiffies(100)); | |
1025 | ||
1026 | WARN_ON(ret == 0); | |
1027 | ||
1028 | drm_vblank_put(dev, crtc); | |
1029 | } | |
1030 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1031 | ||
1032 | /** | |
1033 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1034 | * @crtc: DRM crtc | |
1035 | * | |
1036 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1037 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1038 | * due to lack of driver support or because the crtc is off. | |
1039 | */ | |
1040 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1041 | { | |
1042 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1043 | } | |
1044 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1045 | ||
c6eefa17 RC |
1046 | /** |
1047 | * drm_vblank_off - disable vblank events on a CRTC | |
1048 | * @dev: DRM device | |
1049 | * @crtc: CRTC in question | |
1050 | * | |
f5752b38 DV |
1051 | * Drivers can use this function to shut down the vblank interrupt handling when |
1052 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1053 | * stored so that drm_vblank_on() can restore it again. | |
1054 | * | |
1055 | * Drivers must use this function when the hardware vblank counter can get | |
1056 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1057 | * |
1058 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1059 | */ |
778c9026 LP |
1060 | void drm_vblank_off(struct drm_device *dev, int crtc) |
1061 | { | |
498548ec CJHR |
1062 | struct drm_pending_vblank_event *e, *t; |
1063 | struct timeval now; | |
778c9026 | 1064 | unsigned long irqflags; |
498548ec | 1065 | unsigned int seq; |
778c9026 | 1066 | |
e6ae8687 RC |
1067 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1068 | return; | |
1069 | ||
778c9026 | 1070 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
27641c3f | 1071 | vblank_disable_and_save(dev, crtc); |
57ed0f7b | 1072 | wake_up(&dev->vblank[crtc].queue); |
498548ec CJHR |
1073 | |
1074 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
1075 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
e7783ba3 ID |
1076 | |
1077 | spin_lock(&dev->event_lock); | |
498548ec CJHR |
1078 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
1079 | if (e->pipe != crtc) | |
1080 | continue; | |
1081 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
1082 | wanted %d, current %d\n", | |
1083 | e->event.sequence, seq); | |
c6eefa17 | 1084 | list_del(&e->base.link); |
498548ec | 1085 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1086 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1087 | } |
e7783ba3 | 1088 | spin_unlock(&dev->event_lock); |
498548ec | 1089 | |
778c9026 LP |
1090 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1091 | } | |
1092 | EXPORT_SYMBOL(drm_vblank_off); | |
1093 | ||
89dd6a4b DV |
1094 | /** |
1095 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1096 | * @crtc: CRTC in question | |
1097 | * | |
1098 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1099 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1100 | * stored so that drm_vblank_on can restore it again. | |
1101 | * | |
1102 | * Drivers must use this function when the hardware vblank counter can get | |
1103 | * reset, e.g. when suspending. | |
1104 | * | |
1105 | * This is the native kms version of drm_vblank_off(). | |
1106 | */ | |
1107 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1108 | { | |
1109 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1110 | } | |
1111 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1112 | ||
f2752282 VS |
1113 | /** |
1114 | * drm_vblank_on - enable vblank events on a CRTC | |
1115 | * @dev: DRM device | |
1116 | * @crtc: CRTC in question | |
f5752b38 DV |
1117 | * |
1118 | * This functions restores the vblank interrupt state captured with | |
1119 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
1120 | * drm_vblank_off() can be unbalanced and so can also be unconditionaly called | |
1121 | * in driver load code to reflect the current hardware state of the crtc. | |
89dd6a4b DV |
1122 | * |
1123 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 VS |
1124 | */ |
1125 | void drm_vblank_on(struct drm_device *dev, int crtc) | |
1126 | { | |
1127 | unsigned long irqflags; | |
1128 | ||
e6ae8687 RC |
1129 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1130 | return; | |
1131 | ||
f2752282 VS |
1132 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1133 | /* re-enable interrupts if there's are users left */ | |
1134 | if (atomic_read(&dev->vblank[crtc].refcount) != 0) | |
1135 | WARN_ON(drm_vblank_enable(dev, crtc)); | |
1136 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1137 | } | |
1138 | EXPORT_SYMBOL(drm_vblank_on); | |
1139 | ||
89dd6a4b DV |
1140 | /** |
1141 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1142 | * @crtc: CRTC in question | |
1143 | * | |
1144 | * This functions restores the vblank interrupt state captured with | |
1145 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
1146 | * drm_vblank_off() can be unbalanced and so can also be unconditionaly called | |
1147 | * in driver load code to reflect the current hardware state of the crtc. | |
1148 | * | |
1149 | * This is the native kms version of drm_vblank_on(). | |
1150 | */ | |
1151 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1152 | { | |
1153 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1154 | } | |
1155 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1156 | ||
f453ba04 DA |
1157 | /** |
1158 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1159 | * @dev: DRM device | |
1160 | * @crtc: CRTC in question | |
f453ba04 DA |
1161 | * |
1162 | * Account for vblank events across mode setting events, which will likely | |
1163 | * reset the hardware frame counter. | |
f5752b38 DV |
1164 | * |
1165 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1166 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1167 | * software-side vblank frame counting will ensure that there are no jumps or | |
1168 | * discontinuities. | |
1169 | * | |
1170 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1171 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1172 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1173 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1174 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1175 | * counters. | |
1176 | * | |
1177 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1178 | * again. | |
f453ba04 DA |
1179 | */ |
1180 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
1181 | { | |
b7ea85a4 | 1182 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1183 | if (!dev->num_crtcs) |
1184 | return; | |
e6ae8687 RC |
1185 | |
1186 | if (WARN_ON(crtc >= dev->num_crtcs)) | |
1187 | return; | |
1188 | ||
f453ba04 DA |
1189 | /* |
1190 | * To avoid all the problems that might happen if interrupts | |
1191 | * were enabled/disabled around or between these calls, we just | |
1192 | * have the kernel take a reference on the CRTC (just once though | |
1193 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1194 | * so that interrupts remain enabled in the interim. | |
1195 | */ | |
5380e929 VS |
1196 | if (!dev->vblank[crtc].inmodeset) { |
1197 | dev->vblank[crtc].inmodeset = 0x1; | |
b3f5e732 | 1198 | if (drm_vblank_get(dev, crtc) == 0) |
5380e929 | 1199 | dev->vblank[crtc].inmodeset |= 0x2; |
f453ba04 DA |
1200 | } |
1201 | } | |
1202 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1203 | ||
f5752b38 DV |
1204 | /** |
1205 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1206 | * @dev: DRM device | |
1207 | * @crtc: CRTC in question | |
1208 | * | |
1209 | * This function again drops the temporary vblank reference acquired in | |
1210 | * drm_vblank_pre_modeset. | |
1211 | */ | |
f453ba04 DA |
1212 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) |
1213 | { | |
1214 | unsigned long irqflags; | |
1215 | ||
b7ea85a4 HC |
1216 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1217 | if (!dev->num_crtcs) | |
1218 | return; | |
1219 | ||
5380e929 | 1220 | if (dev->vblank[crtc].inmodeset) { |
f453ba04 | 1221 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
ba0bf120 | 1222 | dev->vblank_disable_allowed = true; |
f453ba04 | 1223 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1224 | |
5380e929 | 1225 | if (dev->vblank[crtc].inmodeset & 0x2) |
b3f5e732 CW |
1226 | drm_vblank_put(dev, crtc); |
1227 | ||
5380e929 | 1228 | dev->vblank[crtc].inmodeset = 0; |
f453ba04 DA |
1229 | } |
1230 | } | |
1231 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1232 | ||
f5752b38 | 1233 | /* |
0a3e67a4 JB |
1234 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1235 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1236 | * | |
1237 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1238 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1239 | * | |
1240 | * Generally the counter will reset across mode sets. If interrupts are | |
1241 | * enabled around this call, we don't have to do anything since the counter | |
1242 | * will have already been incremented. | |
1243 | */ | |
1244 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1245 | struct drm_file *file_priv) | |
1246 | { | |
1247 | struct drm_modeset_ctl *modeset = data; | |
19227561 | 1248 | unsigned int crtc; |
0a3e67a4 JB |
1249 | |
1250 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1251 | if (!dev->num_crtcs) | |
4a1b0714 | 1252 | return 0; |
0a3e67a4 | 1253 | |
29935554 LP |
1254 | /* KMS drivers handle this internally */ |
1255 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1256 | return 0; | |
1257 | ||
0a3e67a4 | 1258 | crtc = modeset->crtc; |
4a1b0714 LP |
1259 | if (crtc >= dev->num_crtcs) |
1260 | return -EINVAL; | |
0a3e67a4 | 1261 | |
0a3e67a4 JB |
1262 | switch (modeset->cmd) { |
1263 | case _DRM_PRE_MODESET: | |
f453ba04 | 1264 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1265 | break; |
1266 | case _DRM_POST_MODESET: | |
f453ba04 | 1267 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1268 | break; |
1269 | default: | |
4a1b0714 | 1270 | return -EINVAL; |
0a3e67a4 JB |
1271 | } |
1272 | ||
4a1b0714 | 1273 | return 0; |
0a3e67a4 JB |
1274 | } |
1275 | ||
c9a9c5e0 KH |
1276 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1277 | union drm_wait_vblank *vblwait, | |
1278 | struct drm_file *file_priv) | |
1279 | { | |
1280 | struct drm_pending_vblank_event *e; | |
1281 | struct timeval now; | |
1282 | unsigned long flags; | |
1283 | unsigned int seq; | |
ea5d552c | 1284 | int ret; |
c9a9c5e0 KH |
1285 | |
1286 | e = kzalloc(sizeof *e, GFP_KERNEL); | |
ea5d552c CW |
1287 | if (e == NULL) { |
1288 | ret = -ENOMEM; | |
1289 | goto err_put; | |
1290 | } | |
c9a9c5e0 KH |
1291 | |
1292 | e->pipe = pipe; | |
b9c2c9ae | 1293 | e->base.pid = current->pid; |
c9a9c5e0 KH |
1294 | e->event.base.type = DRM_EVENT_VBLANK; |
1295 | e->event.base.length = sizeof e->event; | |
1296 | e->event.user_data = vblwait->request.signal; | |
1297 | e->base.event = &e->event.base; | |
1298 | e->base.file_priv = file_priv; | |
1299 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1300 | ||
c9a9c5e0 KH |
1301 | spin_lock_irqsave(&dev->event_lock, flags); |
1302 | ||
1303 | if (file_priv->event_space < sizeof e->event) { | |
ea5d552c CW |
1304 | ret = -EBUSY; |
1305 | goto err_unlock; | |
c9a9c5e0 KH |
1306 | } |
1307 | ||
1308 | file_priv->event_space -= sizeof e->event; | |
27641c3f MK |
1309 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1310 | ||
c9a9c5e0 KH |
1311 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1312 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1313 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1314 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1315 | } |
1316 | ||
1317 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1318 | vblwait->request.sequence, seq, pipe); | |
1319 | ||
b9c2c9ae JB |
1320 | trace_drm_vblank_event_queued(current->pid, pipe, |
1321 | vblwait->request.sequence); | |
1322 | ||
c9a9c5e0 KH |
1323 | e->event.sequence = vblwait->request.sequence; |
1324 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1325 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1326 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1327 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1328 | } else { |
a6778e9e | 1329 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1330 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1331 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1332 | } |
1333 | ||
1334 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1335 | ||
1336 | return 0; | |
ea5d552c CW |
1337 | |
1338 | err_unlock: | |
1339 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1340 | kfree(e); | |
1341 | err_put: | |
6f331623 | 1342 | drm_vblank_put(dev, pipe); |
ea5d552c | 1343 | return ret; |
c9a9c5e0 KH |
1344 | } |
1345 | ||
f5752b38 | 1346 | /* |
1da177e4 LT |
1347 | * Wait for VBLANK. |
1348 | * | |
1349 | * \param inode device inode. | |
6c340eac | 1350 | * \param file_priv DRM file private. |
1da177e4 LT |
1351 | * \param cmd command. |
1352 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1353 | * \return zero on success or a negative number on failure. | |
1354 | * | |
30b23634 EA |
1355 | * This function enables the vblank interrupt on the pipe requested, then |
1356 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1357 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1358 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1359 | */ |
0a3e67a4 JB |
1360 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1361 | struct drm_file *file_priv) | |
1da177e4 | 1362 | { |
c153f45f | 1363 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1364 | int ret; |
19b01b5f | 1365 | unsigned int flags, seq, crtc, high_crtc; |
1da177e4 | 1366 | |
4984979b DV |
1367 | if (!dev->irq_enabled) |
1368 | return -EINVAL; | |
1da177e4 | 1369 | |
30b23634 EA |
1370 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1371 | return -EINVAL; | |
1372 | ||
c153f45f | 1373 | if (vblwait->request.type & |
19b01b5f IH |
1374 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1375 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1376 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1377 | vblwait->request.type, |
19b01b5f IH |
1378 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1379 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MCA |
1380 | return -EINVAL; |
1381 | } | |
1382 | ||
c153f45f | 1383 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
19b01b5f IH |
1384 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1385 | if (high_crtc) | |
1386 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1387 | else | |
1388 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
0a3e67a4 | 1389 | if (crtc >= dev->num_crtcs) |
776c9443 MCA |
1390 | return -EINVAL; |
1391 | ||
0a3e67a4 JB |
1392 | ret = drm_vblank_get(dev, crtc); |
1393 | if (ret) { | |
8d3457ec | 1394 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1395 | return ret; |
1396 | } | |
1397 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1398 | |
c153f45f | 1399 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1400 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1401 | vblwait->request.sequence += seq; |
1402 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1403 | case _DRM_VBLANK_ABSOLUTE: |
1404 | break; | |
1405 | default: | |
0a3e67a4 JB |
1406 | ret = -EINVAL; |
1407 | goto done; | |
1da177e4 LT |
1408 | } |
1409 | ||
a6778e9e IH |
1410 | if (flags & _DRM_VBLANK_EVENT) { |
1411 | /* must hold on to the vblank ref until the event fires | |
1412 | * drm_vblank_put will be called asynchronously | |
1413 | */ | |
c9a9c5e0 | 1414 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); |
a6778e9e | 1415 | } |
c9a9c5e0 | 1416 | |
ab285d74 | 1417 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1418 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1419 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
1420 | } |
1421 | ||
30b23634 EA |
1422 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1423 | vblwait->request.sequence, crtc); | |
5380e929 | 1424 | dev->vblank[crtc].last_wait = vblwait->request.sequence; |
bfd8303a | 1425 | DRM_WAIT_ON(ret, dev->vblank[crtc].queue, 3 * HZ, |
30b23634 EA |
1426 | (((drm_vblank_count(dev, crtc) - |
1427 | vblwait->request.sequence) <= (1 << 23)) || | |
3212a22f | 1428 | !dev->vblank[crtc].enabled || |
30b23634 | 1429 | !dev->irq_enabled)); |
1da177e4 | 1430 | |
30b23634 EA |
1431 | if (ret != -EINTR) { |
1432 | struct timeval now; | |
1da177e4 | 1433 | |
27641c3f | 1434 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1435 | vblwait->reply.tval_sec = now.tv_sec; |
1436 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1437 | |
30b23634 EA |
1438 | DRM_DEBUG("returning %d to client\n", |
1439 | vblwait->reply.sequence); | |
1da177e4 | 1440 | } else { |
30b23634 | 1441 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1442 | } |
1443 | ||
0a3e67a4 JB |
1444 | done: |
1445 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1446 | return ret; |
1447 | } | |
1448 | ||
ea7f7abc | 1449 | static void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
c9a9c5e0 KH |
1450 | { |
1451 | struct drm_pending_vblank_event *e, *t; | |
1452 | struct timeval now; | |
1453 | unsigned long flags; | |
1454 | unsigned int seq; | |
1455 | ||
27641c3f | 1456 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1457 | |
1458 | spin_lock_irqsave(&dev->event_lock, flags); | |
1459 | ||
1460 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1461 | if (e->pipe != crtc) | |
1462 | continue; | |
1463 | if ((seq - e->event.sequence) > (1<<23)) | |
1464 | continue; | |
1465 | ||
1466 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1467 | e->event.sequence, seq); | |
1468 | ||
c6eefa17 | 1469 | list_del(&e->base.link); |
c9a9c5e0 | 1470 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1471 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1472 | } |
1473 | ||
1474 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
ac2874b9 JB |
1475 | |
1476 | trace_drm_vblank_event(crtc, seq); | |
c9a9c5e0 KH |
1477 | } |
1478 | ||
0a3e67a4 JB |
1479 | /** |
1480 | * drm_handle_vblank - handle a vblank event | |
1481 | * @dev: DRM device | |
1482 | * @crtc: where this event occurred | |
1483 | * | |
1484 | * Drivers should call this routine in their vblank interrupt handlers to | |
1485 | * update the vblank counter and send any signals that may be pending. | |
1486 | */ | |
78c6e170 | 1487 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1488 | { |
27641c3f MK |
1489 | u32 vblcount; |
1490 | s64 diff_ns; | |
1491 | struct timeval tvblank; | |
1492 | unsigned long irqflags; | |
1493 | ||
c9a9c5e0 | 1494 | if (!dev->num_crtcs) |
78c6e170 | 1495 | return false; |
c9a9c5e0 | 1496 | |
e6ae8687 RC |
1497 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1498 | return false; | |
1499 | ||
27641c3f MK |
1500 | /* Need timestamp lock to prevent concurrent execution with |
1501 | * vblank enable/disable, as this would cause inconsistent | |
1502 | * or corrupted timestamps and vblank counts. | |
1503 | */ | |
1504 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
1505 | ||
1506 | /* Vblank irq handling disabled. Nothing to do. */ | |
5380e929 | 1507 | if (!dev->vblank[crtc].enabled) { |
27641c3f | 1508 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
78c6e170 | 1509 | return false; |
27641c3f MK |
1510 | } |
1511 | ||
1512 | /* Fetch corresponding timestamp for this vblank interval from | |
1513 | * driver and store it in proper slot of timestamp ringbuffer. | |
1514 | */ | |
1515 | ||
1516 | /* Get current timestamp and count. */ | |
5380e929 | 1517 | vblcount = atomic_read(&dev->vblank[crtc].count); |
27641c3f MK |
1518 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); |
1519 | ||
1520 | /* Compute time difference to timestamp of last vblank */ | |
1521 | diff_ns = timeval_to_ns(&tvblank) - | |
1522 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1523 | ||
1524 | /* Update vblank timestamp and count if at least | |
1525 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1526 | * difference between last stored timestamp and current | |
1527 | * timestamp. A smaller difference means basically | |
1528 | * identical timestamps. Happens if this vblank has | |
1529 | * been already processed and this is a redundant call, | |
1530 | * e.g., due to spurious vblank interrupts. We need to | |
1531 | * ignore those for accounting. | |
1532 | */ | |
c4cc3839 | 1533 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { |
27641c3f MK |
1534 | /* Store new timestamp in ringbuffer. */ |
1535 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
27641c3f MK |
1536 | |
1537 | /* Increment cooked vblank count. This also atomically commits | |
1538 | * the timestamp computed above. | |
1539 | */ | |
4e857c58 | 1540 | smp_mb__before_atomic(); |
5380e929 | 1541 | atomic_inc(&dev->vblank[crtc].count); |
4e857c58 | 1542 | smp_mb__after_atomic(); |
27641c3f MK |
1543 | } else { |
1544 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", | |
1545 | crtc, (int) diff_ns); | |
1546 | } | |
1547 | ||
57ed0f7b | 1548 | wake_up(&dev->vblank[crtc].queue); |
c9a9c5e0 | 1549 | drm_handle_vblank_events(dev, crtc); |
27641c3f MK |
1550 | |
1551 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
78c6e170 | 1552 | return true; |
0a3e67a4 JB |
1553 | } |
1554 | EXPORT_SYMBOL(drm_handle_vblank); |