Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_irq.c |
1da177e4 LT |
3 | * IRQ support |
4 | * | |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
6 | * \author Gareth Hughes <gareth@valinux.com> | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com | |
11 | * | |
12 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
14 | * All Rights Reserved. | |
15 | * | |
16 | * Permission is hereby granted, free of charge, to any person obtaining a | |
17 | * copy of this software and associated documentation files (the "Software"), | |
18 | * to deal in the Software without restriction, including without limitation | |
19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
20 | * and/or sell copies of the Software, and to permit persons to whom the | |
21 | * Software is furnished to do so, subject to the following conditions: | |
22 | * | |
23 | * The above copyright notice and this permission notice (including the next | |
24 | * paragraph) shall be included in all copies or substantial portions of the | |
25 | * Software. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
28 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
29 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
30 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
31 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
32 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
33 | * OTHER DEALINGS IN THE SOFTWARE. | |
34 | */ | |
35 | ||
760285e7 | 36 | #include <drm/drmP.h> |
ac2874b9 | 37 | #include "drm_trace.h" |
1da177e4 LT |
38 | |
39 | #include <linux/interrupt.h> /* For task queue support */ | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 | 41 | |
28d52043 | 42 | #include <linux/vgaarb.h> |
2d1a8a48 | 43 | #include <linux/export.h> |
27641c3f MK |
44 | |
45 | /* Access macro for slots in vblank timestamp ringbuffer. */ | |
5380e929 VS |
46 | #define vblanktimestamp(dev, crtc, count) \ |
47 | ((dev)->vblank[crtc].time[(count) % DRM_VBLANKTIME_RBSIZE]) | |
27641c3f MK |
48 | |
49 | /* Retry timestamp calculation up to 3 times to satisfy | |
50 | * drm_timestamp_precision before giving up. | |
51 | */ | |
52 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
53 | ||
54 | /* Threshold in nanoseconds for detection of redundant | |
55 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
56 | */ | |
57 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
58 | ||
1da177e4 LT |
59 | /** |
60 | * Get interrupt from bus id. | |
b5e89ed5 | 61 | * |
1da177e4 | 62 | * \param inode device inode. |
6c340eac | 63 | * \param file_priv DRM file private. |
1da177e4 LT |
64 | * \param cmd command. |
65 | * \param arg user argument, pointing to a drm_irq_busid structure. | |
66 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 67 | * |
1da177e4 LT |
68 | * Finds the PCI device with the specified bus id and gets its IRQ number. |
69 | * This IOCTL is deprecated, and will now return EINVAL for any busid not equal | |
70 | * to that of the device that this DRM instance attached to. | |
71 | */ | |
c153f45f EA |
72 | int drm_irq_by_busid(struct drm_device *dev, void *data, |
73 | struct drm_file *file_priv) | |
1da177e4 | 74 | { |
c153f45f | 75 | struct drm_irq_busid *p = data; |
1da177e4 | 76 | |
8410ea3b | 77 | if (!dev->driver->bus->irq_by_busid) |
dcdb1674 JC |
78 | return -EINVAL; |
79 | ||
1da177e4 LT |
80 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
81 | return -EINVAL; | |
82 | ||
8410ea3b | 83 | return dev->driver->bus->irq_by_busid(dev, p); |
1da177e4 LT |
84 | } |
85 | ||
27641c3f MK |
86 | /* |
87 | * Clear vblank timestamp buffer for a crtc. | |
88 | */ | |
89 | static void clear_vblank_timestamps(struct drm_device *dev, int crtc) | |
90 | { | |
5380e929 | 91 | memset(dev->vblank[crtc].time, 0, sizeof(dev->vblank[crtc].time)); |
27641c3f MK |
92 | } |
93 | ||
94 | /* | |
95 | * Disable vblank irq's on crtc, make sure that last vblank count | |
96 | * of hardware and corresponding consistent software vblank counter | |
97 | * are preserved, even if there are any spurious vblank irq's after | |
98 | * disable. | |
99 | */ | |
100 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
101 | { | |
102 | unsigned long irqflags; | |
103 | u32 vblcount; | |
104 | s64 diff_ns; | |
105 | int vblrc; | |
106 | struct timeval tvblank; | |
0355cf3a | 107 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
108 | |
109 | /* Prevent vblank irq processing while disabling vblank irqs, | |
110 | * so no updates of timestamps or count can happen after we've | |
111 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 112 | */ |
27641c3f MK |
113 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
114 | ||
115 | dev->driver->disable_vblank(dev, crtc); | |
5380e929 | 116 | dev->vblank[crtc].enabled = false; |
27641c3f MK |
117 | |
118 | /* No further vblank irq's will be processed after | |
119 | * this point. Get current hardware vblank count and | |
120 | * vblank timestamp, repeat until they are consistent. | |
121 | * | |
122 | * FIXME: There is still a race condition here and in | |
123 | * drm_update_vblank_count() which can cause off-by-one | |
124 | * reinitialization of software vblank counter. If gpu | |
125 | * vblank counter doesn't increment exactly at the leading | |
126 | * edge of a vblank interval, then we can lose 1 count if | |
127 | * we happen to execute between start of vblank and the | |
128 | * delayed gpu counter increment. | |
129 | */ | |
130 | do { | |
5380e929 | 131 | dev->vblank[crtc].last = dev->driver->get_vblank_counter(dev, crtc); |
27641c3f | 132 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); |
5380e929 | 133 | } while (dev->vblank[crtc].last != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc); |
0355cf3a EE |
134 | |
135 | if (!count) | |
136 | vblrc = 0; | |
27641c3f MK |
137 | |
138 | /* Compute time difference to stored timestamp of last vblank | |
139 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
140 | */ | |
5380e929 | 141 | vblcount = atomic_read(&dev->vblank[crtc].count); |
27641c3f MK |
142 | diff_ns = timeval_to_ns(&tvblank) - |
143 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
144 | ||
145 | /* If there is at least 1 msec difference between the last stored | |
146 | * timestamp and tvblank, then we are currently executing our | |
147 | * disable inside a new vblank interval, the tvblank timestamp | |
148 | * corresponds to this new vblank interval and the irq handler | |
149 | * for this vblank didn't run yet and won't run due to our disable. | |
150 | * Therefore we need to do the job of drm_handle_vblank() and | |
151 | * increment the vblank counter by one to account for this vblank. | |
152 | * | |
153 | * Skip this step if there isn't any high precision timestamp | |
154 | * available. In that case we can't account for this and just | |
155 | * hope for the best. | |
156 | */ | |
bc215128 | 157 | if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) { |
5380e929 | 158 | atomic_inc(&dev->vblank[crtc].count); |
bc215128 MK |
159 | smp_mb__after_atomic_inc(); |
160 | } | |
27641c3f MK |
161 | |
162 | /* Invalidate all timestamps while vblank irq's are off. */ | |
163 | clear_vblank_timestamps(dev, crtc); | |
164 | ||
165 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
27641c3f MK |
166 | } |
167 | ||
0a3e67a4 JB |
168 | static void vblank_disable_fn(unsigned long arg) |
169 | { | |
170 | struct drm_device *dev = (struct drm_device *)arg; | |
171 | unsigned long irqflags; | |
172 | int i; | |
173 | ||
174 | if (!dev->vblank_disable_allowed) | |
175 | return; | |
176 | ||
177 | for (i = 0; i < dev->num_crtcs; i++) { | |
178 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
5380e929 VS |
179 | if (atomic_read(&dev->vblank[i].refcount) == 0 && |
180 | dev->vblank[i].enabled) { | |
0a3e67a4 | 181 | DRM_DEBUG("disabling vblank on crtc %d\n", i); |
27641c3f | 182 | vblank_disable_and_save(dev, i); |
0a3e67a4 JB |
183 | } |
184 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
185 | } | |
186 | } | |
187 | ||
52440211 | 188 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 JB |
189 | { |
190 | /* Bail if the driver didn't call drm_vblank_init() */ | |
191 | if (dev->num_crtcs == 0) | |
192 | return; | |
193 | ||
7eb3b2c8 | 194 | del_timer_sync(&dev->vblank_disable_timer); |
0a3e67a4 JB |
195 | |
196 | vblank_disable_fn((unsigned long)dev); | |
197 | ||
5380e929 | 198 | kfree(dev->vblank); |
0a3e67a4 JB |
199 | |
200 | dev->num_crtcs = 0; | |
201 | } | |
e77cef9c | 202 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 JB |
203 | |
204 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) | |
205 | { | |
206 | int i, ret = -ENOMEM; | |
207 | ||
208 | setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, | |
209 | (unsigned long)dev); | |
210 | spin_lock_init(&dev->vbl_lock); | |
27641c3f MK |
211 | spin_lock_init(&dev->vblank_time_lock); |
212 | ||
0a3e67a4 JB |
213 | dev->num_crtcs = num_crtcs; |
214 | ||
5380e929 VS |
215 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
216 | if (!dev->vblank) | |
0a3e67a4 JB |
217 | goto err; |
218 | ||
5380e929 VS |
219 | for (i = 0; i < num_crtcs; i++) |
220 | init_waitqueue_head(&dev->vblank[i].queue); | |
27641c3f | 221 | |
8f6fce03 | 222 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
223 | |
224 | /* Driver specific high-precision vblank timestamping supported? */ | |
225 | if (dev->driver->get_vblank_timestamp) | |
226 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
227 | else | |
228 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
229 | ||
ba0bf120 VS |
230 | dev->vblank_disable_allowed = false; |
231 | ||
0a3e67a4 JB |
232 | return 0; |
233 | ||
234 | err: | |
235 | drm_vblank_cleanup(dev); | |
236 | return ret; | |
237 | } | |
238 | EXPORT_SYMBOL(drm_vblank_init); | |
239 | ||
28d52043 DA |
240 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
241 | { | |
242 | struct drm_device *dev = cookie; | |
243 | ||
244 | if (dev->driver->vgaarb_irq) { | |
245 | dev->driver->vgaarb_irq(dev, state); | |
246 | return; | |
247 | } | |
248 | ||
249 | if (!dev->irq_enabled) | |
250 | return; | |
251 | ||
5037f8ac JS |
252 | if (state) { |
253 | if (dev->driver->irq_uninstall) | |
254 | dev->driver->irq_uninstall(dev); | |
255 | } else { | |
256 | if (dev->driver->irq_preinstall) | |
257 | dev->driver->irq_preinstall(dev); | |
258 | if (dev->driver->irq_postinstall) | |
259 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
260 | } |
261 | } | |
262 | ||
1da177e4 LT |
263 | /** |
264 | * Install IRQ handler. | |
265 | * | |
266 | * \param dev DRM device. | |
1da177e4 | 267 | * |
0a3e67a4 | 268 | * Initializes the IRQ related data. Installs the handler, calling the driver |
884a53ef | 269 | * \c irq_preinstall() and \c irq_postinstall() functions |
1da177e4 LT |
270 | * before and after the installation. |
271 | */ | |
0a3e67a4 | 272 | int drm_irq_install(struct drm_device *dev) |
1da177e4 | 273 | { |
4a1b0714 | 274 | int ret; |
b5e89ed5 | 275 | unsigned long sh_flags = 0; |
b8da7de5 | 276 | char *irqname; |
1da177e4 LT |
277 | |
278 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
279 | return -EINVAL; | |
280 | ||
dcdb1674 | 281 | if (drm_dev_to_irq(dev) == 0) |
1da177e4 LT |
282 | return -EINVAL; |
283 | ||
30e2fb18 | 284 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
285 | |
286 | /* Driver must have been initialized */ | |
b5e89ed5 | 287 | if (!dev->dev_private) { |
30e2fb18 | 288 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
289 | return -EINVAL; |
290 | } | |
291 | ||
b5e89ed5 | 292 | if (dev->irq_enabled) { |
30e2fb18 | 293 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
294 | return -EBUSY; |
295 | } | |
4423843c | 296 | dev->irq_enabled = true; |
30e2fb18 | 297 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 298 | |
dcdb1674 | 299 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
1da177e4 | 300 | |
b5e89ed5 | 301 | /* Before installing handler */ |
5037f8ac JS |
302 | if (dev->driver->irq_preinstall) |
303 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 304 | |
b5e89ed5 | 305 | /* Install handler */ |
1da177e4 | 306 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 307 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 308 | |
b8da7de5 DA |
309 | if (dev->devname) |
310 | irqname = dev->devname; | |
311 | else | |
312 | irqname = dev->driver->name; | |
313 | ||
9bfbd5cb | 314 | ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, |
b8da7de5 | 315 | sh_flags, irqname, dev); |
9bfbd5cb | 316 | |
b5e89ed5 | 317 | if (ret < 0) { |
30e2fb18 | 318 | mutex_lock(&dev->struct_mutex); |
4423843c | 319 | dev->irq_enabled = false; |
30e2fb18 | 320 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
321 | return ret; |
322 | } | |
323 | ||
28d52043 DA |
324 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
325 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
326 | ||
b5e89ed5 | 327 | /* After installing handler */ |
5037f8ac JS |
328 | if (dev->driver->irq_postinstall) |
329 | ret = dev->driver->irq_postinstall(dev); | |
330 | ||
0a3e67a4 JB |
331 | if (ret < 0) { |
332 | mutex_lock(&dev->struct_mutex); | |
4423843c | 333 | dev->irq_enabled = false; |
0a3e67a4 | 334 | mutex_unlock(&dev->struct_mutex); |
e1c44acc JS |
335 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
336 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
337 | free_irq(drm_dev_to_irq(dev), dev); | |
0a3e67a4 | 338 | } |
1da177e4 | 339 | |
0a3e67a4 | 340 | return ret; |
1da177e4 | 341 | } |
0a3e67a4 | 342 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
343 | |
344 | /** | |
345 | * Uninstall the IRQ handler. | |
346 | * | |
347 | * \param dev DRM device. | |
348 | * | |
884a53ef | 349 | * Calls the driver's \c irq_uninstall() function, and stops the irq. |
1da177e4 | 350 | */ |
27641c3f | 351 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 352 | { |
dc1336ff | 353 | unsigned long irqflags; |
4423843c VS |
354 | bool irq_enabled; |
355 | int i; | |
1da177e4 LT |
356 | |
357 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
358 | return -EINVAL; | |
359 | ||
30e2fb18 | 360 | mutex_lock(&dev->struct_mutex); |
1da177e4 | 361 | irq_enabled = dev->irq_enabled; |
4423843c | 362 | dev->irq_enabled = false; |
30e2fb18 | 363 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 364 | |
dc1336ff JB |
365 | /* |
366 | * Wake up any waiters so they don't hang. | |
367 | */ | |
bde4889a BS |
368 | if (dev->num_crtcs) { |
369 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
370 | for (i = 0; i < dev->num_crtcs; i++) { | |
57ed0f7b | 371 | wake_up(&dev->vblank[i].queue); |
5380e929 VS |
372 | dev->vblank[i].enabled = false; |
373 | dev->vblank[i].last = | |
bde4889a BS |
374 | dev->driver->get_vblank_counter(dev, i); |
375 | } | |
376 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 377 | } |
dc1336ff | 378 | |
b5e89ed5 | 379 | if (!irq_enabled) |
1da177e4 LT |
380 | return -EINVAL; |
381 | ||
dcdb1674 | 382 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
1da177e4 | 383 | |
28d52043 DA |
384 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
385 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
386 | ||
5037f8ac JS |
387 | if (dev->driver->irq_uninstall) |
388 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 389 | |
dcdb1674 | 390 | free_irq(drm_dev_to_irq(dev), dev); |
1da177e4 LT |
391 | |
392 | return 0; | |
393 | } | |
394 | EXPORT_SYMBOL(drm_irq_uninstall); | |
395 | ||
396 | /** | |
397 | * IRQ control ioctl. | |
398 | * | |
399 | * \param inode device inode. | |
6c340eac | 400 | * \param file_priv DRM file private. |
1da177e4 LT |
401 | * \param cmd command. |
402 | * \param arg user argument, pointing to a drm_control structure. | |
403 | * \return zero on success or a negative number on failure. | |
404 | * | |
405 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
406 | */ | |
c153f45f EA |
407 | int drm_control(struct drm_device *dev, void *data, |
408 | struct drm_file *file_priv) | |
1da177e4 | 409 | { |
c153f45f | 410 | struct drm_control *ctl = data; |
b5e89ed5 | 411 | |
27641c3f MK |
412 | /* if we haven't irq we fallback for compatibility reasons - |
413 | * this used to be a separate function in drm_dma.h | |
414 | */ | |
1da177e4 | 415 | |
1da177e4 | 416 | |
c153f45f | 417 | switch (ctl->func) { |
1da177e4 LT |
418 | case DRM_INST_HANDLER: |
419 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
420 | return 0; | |
f453ba04 DA |
421 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
422 | return 0; | |
1da177e4 | 423 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
dcdb1674 | 424 | ctl->irq != drm_dev_to_irq(dev)) |
1da177e4 | 425 | return -EINVAL; |
b5e89ed5 | 426 | return drm_irq_install(dev); |
1da177e4 LT |
427 | case DRM_UNINST_HANDLER: |
428 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
429 | return 0; | |
f453ba04 DA |
430 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
431 | return 0; | |
b5e89ed5 | 432 | return drm_irq_uninstall(dev); |
1da177e4 LT |
433 | default: |
434 | return -EINVAL; | |
435 | } | |
436 | } | |
437 | ||
27641c3f | 438 | /** |
21b21560 | 439 | * drm_calc_timestamping_constants - Calculate vblank timestamp constants |
27641c3f MK |
440 | * |
441 | * @crtc drm_crtc whose timestamp constants should be updated. | |
545cdd55 | 442 | * @mode display mode containing the scanout timings |
27641c3f | 443 | * |
21b21560 VS |
444 | * Calculate and store various constants which are later |
445 | * needed by vblank and swap-completion timestamping, e.g, | |
446 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
447 | * derived from crtc's true scanout timing, so they take | |
448 | * things like panel scaling or other adjustments into account. | |
27641c3f | 449 | */ |
545cdd55 VS |
450 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
451 | const struct drm_display_mode *mode) | |
27641c3f | 452 | { |
3c184f69 | 453 | int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; |
77666b72 | 454 | int dotclock = mode->crtc_clock; |
27641c3f MK |
455 | |
456 | /* Valid dotclock? */ | |
457 | if (dotclock > 0) { | |
0dae35a3 VS |
458 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
459 | ||
460 | /* | |
461 | * Convert scanline length in pixels and video | |
462 | * dot clock to line duration, frame duration | |
463 | * and pixel duration in nanoseconds: | |
27641c3f | 464 | */ |
0dae35a3 VS |
465 | pixeldur_ns = 1000000 / dotclock; |
466 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
467 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
468 | |
469 | /* | |
470 | * Fields of interlaced scanout modes are only half a frame duration. | |
471 | */ | |
472 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
473 | framedur_ns /= 2; | |
27641c3f MK |
474 | } else |
475 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", | |
476 | crtc->base.id); | |
477 | ||
478 | crtc->pixeldur_ns = pixeldur_ns; | |
479 | crtc->linedur_ns = linedur_ns; | |
480 | crtc->framedur_ns = framedur_ns; | |
481 | ||
482 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
545cdd55 VS |
483 | crtc->base.id, mode->crtc_htotal, |
484 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
27641c3f | 485 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", |
3c184f69 VS |
486 | crtc->base.id, dotclock, framedur_ns, |
487 | linedur_ns, pixeldur_ns); | |
27641c3f MK |
488 | } |
489 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
490 | ||
491 | /** | |
492 | * drm_calc_vbltimestamp_from_scanoutpos - helper routine for kms | |
493 | * drivers. Implements calculation of exact vblank timestamps from | |
494 | * given drm_display_mode timings and current video scanout position | |
495 | * of a crtc. This can be called from within get_vblank_timestamp() | |
496 | * implementation of a kms driver to implement the actual timestamping. | |
497 | * | |
498 | * Should return timestamps conforming to the OML_sync_control OpenML | |
499 | * extension specification. The timestamp corresponds to the end of | |
500 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
501 | * pixel in the following video frame. | |
502 | * | |
503 | * Requires support for optional dev->driver->get_scanout_position() | |
504 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
505 | * that corresponds to the true scanout timing. | |
506 | * | |
507 | * The current implementation only handles standard video modes. It | |
508 | * returns as no operation if a doublescan or interlaced video mode is | |
509 | * active. Higher level code is expected to handle this. | |
510 | * | |
511 | * @dev: DRM device. | |
512 | * @crtc: Which crtc's vblank timestamp to retrieve. | |
513 | * @max_error: Desired maximum allowable error in timestamps (nanosecs). | |
514 | * On return contains true maximum error of timestamp. | |
515 | * @vblank_time: Pointer to struct timeval which should receive the timestamp. | |
516 | * @flags: Flags to pass to driver: | |
517 | * 0 = Default. | |
518 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. | |
519 | * @refcrtc: drm_crtc* of crtc which defines scanout timing. | |
7da903ef | 520 | * @mode: mode which defines the scanout timings |
27641c3f MK |
521 | * |
522 | * Returns negative value on error, failure or if not supported in current | |
523 | * video mode: | |
524 | * | |
525 | * -EINVAL - Invalid crtc. | |
526 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. | |
527 | * -ENOTSUPP - Function not supported in current display mode. | |
528 | * -EIO - Failed, e.g., due to failed scanout position query. | |
529 | * | |
530 | * Returns or'ed positive status flags on success: | |
531 | * | |
532 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
533 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
534 | * | |
535 | */ | |
536 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, | |
537 | int *max_error, | |
538 | struct timeval *vblank_time, | |
539 | unsigned flags, | |
7da903ef VS |
540 | const struct drm_crtc *refcrtc, |
541 | const struct drm_display_mode *mode) | |
27641c3f | 542 | { |
e62f2f5a ID |
543 | ktime_t stime, etime, mono_time_offset; |
544 | struct timeval tv_etime; | |
27641c3f MK |
545 | int vbl_status, vtotal, vdisplay; |
546 | int vpos, hpos, i; | |
3c184f69 | 547 | int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; |
27641c3f MK |
548 | bool invbl; |
549 | ||
550 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
551 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
552 | return -EINVAL; | |
553 | } | |
554 | ||
555 | /* Scanout position query not supported? Should not happen. */ | |
556 | if (!dev->driver->get_scanout_position) { | |
557 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
558 | return -EIO; | |
559 | } | |
560 | ||
27641c3f MK |
561 | vtotal = mode->crtc_vtotal; |
562 | vdisplay = mode->crtc_vdisplay; | |
563 | ||
564 | /* Durations of frames, lines, pixels in nanoseconds. */ | |
565 | framedur_ns = refcrtc->framedur_ns; | |
566 | linedur_ns = refcrtc->linedur_ns; | |
567 | pixeldur_ns = refcrtc->pixeldur_ns; | |
568 | ||
569 | /* If mode timing undefined, just return as no-op: | |
570 | * Happens during initial modesetting of a crtc. | |
571 | */ | |
572 | if (vtotal <= 0 || vdisplay <= 0 || framedur_ns == 0) { | |
573 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); | |
574 | return -EAGAIN; | |
575 | } | |
576 | ||
27641c3f MK |
577 | /* Get current scanout position with system timestamp. |
578 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
579 | * if single query takes longer than max_error nanoseconds. | |
580 | * | |
581 | * This guarantees a tight bound on maximum error if | |
582 | * code gets preempted or delayed for some reason. | |
583 | */ | |
584 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
585 | /* |
586 | * Get vertical and horizontal scanout position vpos, hpos, | |
587 | * and bounding timestamps stime, etime, pre/post query. | |
588 | */ | |
abca9e45 | 589 | vbl_status = dev->driver->get_scanout_position(dev, crtc, flags, &vpos, |
8f6fce03 | 590 | &hpos, &stime, &etime); |
27641c3f | 591 | |
8f6fce03 MK |
592 | /* |
593 | * Get correction for CLOCK_MONOTONIC -> CLOCK_REALTIME if | |
594 | * CLOCK_REALTIME is requested. | |
595 | */ | |
c61eef72 ID |
596 | if (!drm_timestamp_monotonic) |
597 | mono_time_offset = ktime_get_monotonic_offset(); | |
27641c3f | 598 | |
27641c3f MK |
599 | /* Return as no-op if scanout query unsupported or failed. */ |
600 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
601 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
602 | crtc, vbl_status); | |
603 | return -EIO; | |
604 | } | |
605 | ||
8f6fce03 | 606 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 607 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
608 | |
609 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 610 | if (duration_ns <= *max_error) |
27641c3f MK |
611 | break; |
612 | } | |
613 | ||
614 | /* Noisy system timing? */ | |
615 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
616 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
3c184f69 | 617 | crtc, duration_ns/1000, *max_error/1000, i); |
27641c3f MK |
618 | } |
619 | ||
620 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 621 | *max_error = duration_ns; |
27641c3f MK |
622 | |
623 | /* Check if in vblank area: | |
624 | * vpos is >=0 in video scanout area, but negative | |
625 | * within vblank area, counting down the number of lines until | |
626 | * start of scanout. | |
627 | */ | |
628 | invbl = vbl_status & DRM_SCANOUTPOS_INVBL; | |
629 | ||
630 | /* Convert scanout position into elapsed time at raw_time query | |
631 | * since start of scanout at first display scanline. delta_ns | |
632 | * can be negative if start of scanout hasn't happened yet. | |
633 | */ | |
3c184f69 | 634 | delta_ns = vpos * linedur_ns + hpos * pixeldur_ns; |
27641c3f MK |
635 | |
636 | /* Is vpos outside nominal vblank area, but less than | |
637 | * 1/100 of a frame height away from start of vblank? | |
638 | * If so, assume this isn't a massively delayed vblank | |
639 | * interrupt, but a vblank interrupt that fired a few | |
640 | * microseconds before true start of vblank. Compensate | |
641 | * by adding a full frame duration to the final timestamp. | |
642 | * Happens, e.g., on ATI R500, R600. | |
643 | * | |
644 | * We only do this if DRM_CALLED_FROM_VBLIRQ. | |
645 | */ | |
646 | if ((flags & DRM_CALLED_FROM_VBLIRQ) && !invbl && | |
647 | ((vdisplay - vpos) < vtotal / 100)) { | |
648 | delta_ns = delta_ns - framedur_ns; | |
649 | ||
650 | /* Signal this correction as "applied". */ | |
651 | vbl_status |= 0x8; | |
652 | } | |
653 | ||
c61eef72 ID |
654 | if (!drm_timestamp_monotonic) |
655 | etime = ktime_sub(etime, mono_time_offset); | |
656 | ||
e62f2f5a ID |
657 | /* save this only for debugging purposes */ |
658 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
659 | /* Subtract time delta from raw timestamp to get final |
660 | * vblank_time timestamp for end of vblank. | |
661 | */ | |
e91abf80 MD |
662 | if (delta_ns < 0) |
663 | etime = ktime_add_ns(etime, -delta_ns); | |
664 | else | |
665 | etime = ktime_sub_ns(etime, delta_ns); | |
e62f2f5a | 666 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 667 | |
bbb0aef5 JP |
668 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
669 | crtc, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 670 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 | 671 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
3c184f69 | 672 | duration_ns/1000, i); |
27641c3f MK |
673 | |
674 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
675 | if (invbl) | |
676 | vbl_status |= DRM_VBLANKTIME_INVBL; | |
677 | ||
678 | return vbl_status; | |
679 | } | |
680 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
681 | ||
c61eef72 ID |
682 | static struct timeval get_drm_timestamp(void) |
683 | { | |
684 | ktime_t now; | |
685 | ||
686 | now = ktime_get(); | |
687 | if (!drm_timestamp_monotonic) | |
688 | now = ktime_sub(now, ktime_get_monotonic_offset()); | |
689 | ||
690 | return ktime_to_timeval(now); | |
691 | } | |
692 | ||
27641c3f MK |
693 | /** |
694 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
695 | * vblank interval. | |
696 | * | |
697 | * @dev: DRM device | |
698 | * @crtc: which crtc's vblank timestamp to retrieve | |
699 | * @tvblank: Pointer to target struct timeval which should receive the timestamp | |
700 | * @flags: Flags to pass to driver: | |
701 | * 0 = Default. | |
702 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. | |
703 | * | |
704 | * Fetches the system timestamp corresponding to the time of the most recent | |
705 | * vblank interval on specified crtc. May call into kms-driver to | |
706 | * compute the timestamp with a high-precision GPU specific method. | |
707 | * | |
708 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
709 | * call, i.e., it isn't very precisely locked to the true vblank. | |
710 | * | |
711 | * Returns non-zero if timestamp is considered to be very precise. | |
712 | */ | |
713 | u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
714 | struct timeval *tvblank, unsigned flags) | |
715 | { | |
4a1b0714 | 716 | int ret; |
27641c3f MK |
717 | |
718 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
719 | int max_error = (int) drm_timestamp_precision * 1000; | |
720 | ||
721 | /* Query driver if possible and precision timestamping enabled. */ | |
722 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
723 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
724 | tvblank, flags); | |
725 | if (ret > 0) | |
726 | return (u32) ret; | |
727 | } | |
728 | ||
729 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 730 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 731 | */ |
c61eef72 | 732 | *tvblank = get_drm_timestamp(); |
27641c3f MK |
733 | |
734 | return 0; | |
735 | } | |
736 | EXPORT_SYMBOL(drm_get_last_vbltimestamp); | |
737 | ||
0a3e67a4 JB |
738 | /** |
739 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
740 | * @dev: DRM device | |
741 | * @crtc: which counter to retrieve | |
742 | * | |
743 | * Fetches the "cooked" vblank count value that represents the number of | |
744 | * vblank events since the system was booted, including lost events due to | |
745 | * modesetting activity. | |
746 | */ | |
747 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
748 | { | |
5380e929 | 749 | return atomic_read(&dev->vblank[crtc].count); |
0a3e67a4 JB |
750 | } |
751 | EXPORT_SYMBOL(drm_vblank_count); | |
752 | ||
27641c3f MK |
753 | /** |
754 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
755 | * and the system timestamp corresponding to that vblank counter value. | |
756 | * | |
757 | * @dev: DRM device | |
758 | * @crtc: which counter to retrieve | |
759 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
760 | * | |
761 | * Fetches the "cooked" vblank count value that represents the number of | |
762 | * vblank events since the system was booted, including lost events due to | |
763 | * modesetting activity. Returns corresponding system timestamp of the time | |
764 | * of the vblank interval that corresponds to the current value vblank counter | |
765 | * value. | |
766 | */ | |
767 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
768 | struct timeval *vblanktime) | |
769 | { | |
770 | u32 cur_vblank; | |
771 | ||
772 | /* Read timestamp from slot of _vblank_time ringbuffer | |
773 | * that corresponds to current vblank count. Retry if | |
774 | * count has incremented during readout. This works like | |
775 | * a seqlock. | |
776 | */ | |
777 | do { | |
5380e929 | 778 | cur_vblank = atomic_read(&dev->vblank[crtc].count); |
27641c3f MK |
779 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); |
780 | smp_rmb(); | |
5380e929 | 781 | } while (cur_vblank != atomic_read(&dev->vblank[crtc].count)); |
27641c3f MK |
782 | |
783 | return cur_vblank; | |
784 | } | |
785 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
786 | ||
c6eefa17 RC |
787 | static void send_vblank_event(struct drm_device *dev, |
788 | struct drm_pending_vblank_event *e, | |
789 | unsigned long seq, struct timeval *now) | |
790 | { | |
791 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
792 | e->event.sequence = seq; | |
793 | e->event.tv_sec = now->tv_sec; | |
794 | e->event.tv_usec = now->tv_usec; | |
795 | ||
796 | list_add_tail(&e->base.link, | |
797 | &e->base.file_priv->event_list); | |
798 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
799 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
800 | e->event.sequence); | |
801 | } | |
802 | ||
803 | /** | |
804 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
805 | * @dev: DRM device | |
806 | * @crtc: CRTC in question | |
807 | * @e: the event to send | |
808 | * | |
809 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
810 | * Caller must hold event lock. | |
811 | */ | |
812 | void drm_send_vblank_event(struct drm_device *dev, int crtc, | |
813 | struct drm_pending_vblank_event *e) | |
814 | { | |
815 | struct timeval now; | |
816 | unsigned int seq; | |
817 | if (crtc >= 0) { | |
818 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
819 | } else { | |
820 | seq = 0; | |
c61eef72 ID |
821 | |
822 | now = get_drm_timestamp(); | |
c6eefa17 | 823 | } |
21a245d2 | 824 | e->pipe = crtc; |
c6eefa17 RC |
825 | send_vblank_event(dev, e, seq, &now); |
826 | } | |
827 | EXPORT_SYMBOL(drm_send_vblank_event); | |
828 | ||
0a3e67a4 JB |
829 | /** |
830 | * drm_update_vblank_count - update the master vblank counter | |
831 | * @dev: DRM device | |
832 | * @crtc: counter to update | |
833 | * | |
834 | * Call back into the driver to update the appropriate vblank counter | |
835 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
836 | * update the last read value so we can deal with wraparound on the next | |
837 | * call if necessary. | |
838 | * | |
839 | * Only necessary when going from off->on, to account for frames we | |
840 | * didn't get an interrupt for. | |
841 | * | |
842 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
843 | * device vblank fields. | |
844 | */ | |
845 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
846 | { | |
27641c3f MK |
847 | u32 cur_vblank, diff, tslot, rc; |
848 | struct timeval t_vblank; | |
0a3e67a4 JB |
849 | |
850 | /* | |
851 | * Interrupts were disabled prior to this call, so deal with counter | |
852 | * wrap if needed. | |
853 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
854 | * here if the register is small or we had vblank interrupts off for | |
855 | * a long time. | |
27641c3f MK |
856 | * |
857 | * We repeat the hardware vblank counter & timestamp query until | |
858 | * we get consistent results. This to prevent races between gpu | |
859 | * updating its hardware counter while we are retrieving the | |
860 | * corresponding vblank timestamp. | |
0a3e67a4 | 861 | */ |
27641c3f MK |
862 | do { |
863 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
864 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
865 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
866 | ||
867 | /* Deal with counter wrap */ | |
5380e929 VS |
868 | diff = cur_vblank - dev->vblank[crtc].last; |
869 | if (cur_vblank < dev->vblank[crtc].last) { | |
0a3e67a4 JB |
870 | diff += dev->max_vblank_count; |
871 | ||
872 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
5380e929 | 873 | crtc, dev->vblank[crtc].last, cur_vblank, diff); |
0a3e67a4 JB |
874 | } |
875 | ||
876 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", | |
877 | crtc, diff); | |
878 | ||
27641c3f MK |
879 | /* Reinitialize corresponding vblank timestamp if high-precision query |
880 | * available. Skip this step if query unsupported or failed. Will | |
881 | * reinitialize delayed at next vblank interrupt in that case. | |
882 | */ | |
883 | if (rc) { | |
5380e929 | 884 | tslot = atomic_read(&dev->vblank[crtc].count) + diff; |
27641c3f | 885 | vblanktimestamp(dev, crtc, tslot) = t_vblank; |
27641c3f MK |
886 | } |
887 | ||
bc215128 | 888 | smp_mb__before_atomic_inc(); |
5380e929 | 889 | atomic_add(diff, &dev->vblank[crtc].count); |
bc215128 | 890 | smp_mb__after_atomic_inc(); |
0a3e67a4 JB |
891 | } |
892 | ||
893 | /** | |
894 | * drm_vblank_get - get a reference count on vblank events | |
895 | * @dev: DRM device | |
896 | * @crtc: which CRTC to own | |
897 | * | |
898 | * Acquire a reference count on vblank events to avoid having them disabled | |
899 | * while in use. | |
900 | * | |
901 | * RETURNS | |
902 | * Zero on success, nonzero on failure. | |
903 | */ | |
904 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
905 | { | |
27641c3f | 906 | unsigned long irqflags, irqflags2; |
0a3e67a4 JB |
907 | int ret = 0; |
908 | ||
909 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
910 | /* Going from 0->1 means we have to enable interrupts again */ | |
5380e929 | 911 | if (atomic_add_return(1, &dev->vblank[crtc].refcount) == 1) { |
27641c3f | 912 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags2); |
5380e929 | 913 | if (!dev->vblank[crtc].enabled) { |
27641c3f MK |
914 | /* Enable vblank irqs under vblank_time_lock protection. |
915 | * All vblank count & timestamp updates are held off | |
916 | * until we are done reinitializing master counter and | |
917 | * timestamps. Filtercode in drm_handle_vblank() will | |
918 | * prevent double-accounting of same vblank interval. | |
919 | */ | |
778c9026 | 920 | ret = dev->driver->enable_vblank(dev, crtc); |
27641c3f MK |
921 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", |
922 | crtc, ret); | |
778c9026 | 923 | if (ret) |
5380e929 | 924 | atomic_dec(&dev->vblank[crtc].refcount); |
778c9026 | 925 | else { |
5380e929 | 926 | dev->vblank[crtc].enabled = true; |
778c9026 LP |
927 | drm_update_vblank_count(dev, crtc); |
928 | } | |
929 | } | |
27641c3f | 930 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2); |
778c9026 | 931 | } else { |
5380e929 VS |
932 | if (!dev->vblank[crtc].enabled) { |
933 | atomic_dec(&dev->vblank[crtc].refcount); | |
778c9026 | 934 | ret = -EINVAL; |
0a3e67a4 JB |
935 | } |
936 | } | |
937 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
938 | ||
939 | return ret; | |
940 | } | |
941 | EXPORT_SYMBOL(drm_vblank_get); | |
942 | ||
943 | /** | |
944 | * drm_vblank_put - give up ownership of vblank events | |
945 | * @dev: DRM device | |
946 | * @crtc: which counter to give up | |
947 | * | |
948 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 949 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
0a3e67a4 JB |
950 | */ |
951 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
952 | { | |
5380e929 | 953 | BUG_ON(atomic_read(&dev->vblank[crtc].refcount) == 0); |
b3f5e732 | 954 | |
0a3e67a4 | 955 | /* Last user schedules interrupt disable */ |
5380e929 | 956 | if (atomic_dec_and_test(&dev->vblank[crtc].refcount) && |
27641c3f MK |
957 | (drm_vblank_offdelay > 0)) |
958 | mod_timer(&dev->vblank_disable_timer, | |
bfd8303a | 959 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); |
0a3e67a4 JB |
960 | } |
961 | EXPORT_SYMBOL(drm_vblank_put); | |
962 | ||
c6eefa17 RC |
963 | /** |
964 | * drm_vblank_off - disable vblank events on a CRTC | |
965 | * @dev: DRM device | |
966 | * @crtc: CRTC in question | |
967 | * | |
968 | * Caller must hold event lock. | |
969 | */ | |
778c9026 LP |
970 | void drm_vblank_off(struct drm_device *dev, int crtc) |
971 | { | |
498548ec CJHR |
972 | struct drm_pending_vblank_event *e, *t; |
973 | struct timeval now; | |
778c9026 | 974 | unsigned long irqflags; |
498548ec | 975 | unsigned int seq; |
778c9026 LP |
976 | |
977 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
27641c3f | 978 | vblank_disable_and_save(dev, crtc); |
57ed0f7b | 979 | wake_up(&dev->vblank[crtc].queue); |
498548ec CJHR |
980 | |
981 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
982 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
e7783ba3 ID |
983 | |
984 | spin_lock(&dev->event_lock); | |
498548ec CJHR |
985 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
986 | if (e->pipe != crtc) | |
987 | continue; | |
988 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
989 | wanted %d, current %d\n", | |
990 | e->event.sequence, seq); | |
c6eefa17 | 991 | list_del(&e->base.link); |
498548ec | 992 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 993 | send_vblank_event(dev, e, seq, &now); |
498548ec | 994 | } |
e7783ba3 | 995 | spin_unlock(&dev->event_lock); |
498548ec | 996 | |
778c9026 LP |
997 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
998 | } | |
999 | EXPORT_SYMBOL(drm_vblank_off); | |
1000 | ||
f453ba04 DA |
1001 | /** |
1002 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1003 | * @dev: DRM device | |
1004 | * @crtc: CRTC in question | |
f453ba04 DA |
1005 | * |
1006 | * Account for vblank events across mode setting events, which will likely | |
1007 | * reset the hardware frame counter. | |
1008 | */ | |
1009 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
1010 | { | |
b7ea85a4 | 1011 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1012 | if (!dev->num_crtcs) |
1013 | return; | |
f453ba04 DA |
1014 | /* |
1015 | * To avoid all the problems that might happen if interrupts | |
1016 | * were enabled/disabled around or between these calls, we just | |
1017 | * have the kernel take a reference on the CRTC (just once though | |
1018 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1019 | * so that interrupts remain enabled in the interim. | |
1020 | */ | |
5380e929 VS |
1021 | if (!dev->vblank[crtc].inmodeset) { |
1022 | dev->vblank[crtc].inmodeset = 0x1; | |
b3f5e732 | 1023 | if (drm_vblank_get(dev, crtc) == 0) |
5380e929 | 1024 | dev->vblank[crtc].inmodeset |= 0x2; |
f453ba04 DA |
1025 | } |
1026 | } | |
1027 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1028 | ||
1029 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) | |
1030 | { | |
1031 | unsigned long irqflags; | |
1032 | ||
b7ea85a4 HC |
1033 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1034 | if (!dev->num_crtcs) | |
1035 | return; | |
1036 | ||
5380e929 | 1037 | if (dev->vblank[crtc].inmodeset) { |
f453ba04 | 1038 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
ba0bf120 | 1039 | dev->vblank_disable_allowed = true; |
f453ba04 | 1040 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1041 | |
5380e929 | 1042 | if (dev->vblank[crtc].inmodeset & 0x2) |
b3f5e732 CW |
1043 | drm_vblank_put(dev, crtc); |
1044 | ||
5380e929 | 1045 | dev->vblank[crtc].inmodeset = 0; |
f453ba04 DA |
1046 | } |
1047 | } | |
1048 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1049 | ||
0a3e67a4 JB |
1050 | /** |
1051 | * drm_modeset_ctl - handle vblank event counter changes across mode switch | |
1052 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1053 | * | |
1054 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1055 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1056 | * | |
1057 | * Generally the counter will reset across mode sets. If interrupts are | |
1058 | * enabled around this call, we don't have to do anything since the counter | |
1059 | * will have already been incremented. | |
1060 | */ | |
1061 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1062 | struct drm_file *file_priv) | |
1063 | { | |
1064 | struct drm_modeset_ctl *modeset = data; | |
19227561 | 1065 | unsigned int crtc; |
0a3e67a4 JB |
1066 | |
1067 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1068 | if (!dev->num_crtcs) | |
4a1b0714 | 1069 | return 0; |
0a3e67a4 | 1070 | |
29935554 LP |
1071 | /* KMS drivers handle this internally */ |
1072 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1073 | return 0; | |
1074 | ||
0a3e67a4 | 1075 | crtc = modeset->crtc; |
4a1b0714 LP |
1076 | if (crtc >= dev->num_crtcs) |
1077 | return -EINVAL; | |
0a3e67a4 | 1078 | |
0a3e67a4 JB |
1079 | switch (modeset->cmd) { |
1080 | case _DRM_PRE_MODESET: | |
f453ba04 | 1081 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1082 | break; |
1083 | case _DRM_POST_MODESET: | |
f453ba04 | 1084 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1085 | break; |
1086 | default: | |
4a1b0714 | 1087 | return -EINVAL; |
0a3e67a4 JB |
1088 | } |
1089 | ||
4a1b0714 | 1090 | return 0; |
0a3e67a4 JB |
1091 | } |
1092 | ||
c9a9c5e0 KH |
1093 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1094 | union drm_wait_vblank *vblwait, | |
1095 | struct drm_file *file_priv) | |
1096 | { | |
1097 | struct drm_pending_vblank_event *e; | |
1098 | struct timeval now; | |
1099 | unsigned long flags; | |
1100 | unsigned int seq; | |
ea5d552c | 1101 | int ret; |
c9a9c5e0 KH |
1102 | |
1103 | e = kzalloc(sizeof *e, GFP_KERNEL); | |
ea5d552c CW |
1104 | if (e == NULL) { |
1105 | ret = -ENOMEM; | |
1106 | goto err_put; | |
1107 | } | |
c9a9c5e0 KH |
1108 | |
1109 | e->pipe = pipe; | |
b9c2c9ae | 1110 | e->base.pid = current->pid; |
c9a9c5e0 KH |
1111 | e->event.base.type = DRM_EVENT_VBLANK; |
1112 | e->event.base.length = sizeof e->event; | |
1113 | e->event.user_data = vblwait->request.signal; | |
1114 | e->base.event = &e->event.base; | |
1115 | e->base.file_priv = file_priv; | |
1116 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1117 | ||
c9a9c5e0 KH |
1118 | spin_lock_irqsave(&dev->event_lock, flags); |
1119 | ||
1120 | if (file_priv->event_space < sizeof e->event) { | |
ea5d552c CW |
1121 | ret = -EBUSY; |
1122 | goto err_unlock; | |
c9a9c5e0 KH |
1123 | } |
1124 | ||
1125 | file_priv->event_space -= sizeof e->event; | |
27641c3f MK |
1126 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1127 | ||
c9a9c5e0 KH |
1128 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1129 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1130 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1131 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1132 | } |
1133 | ||
1134 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1135 | vblwait->request.sequence, seq, pipe); | |
1136 | ||
b9c2c9ae JB |
1137 | trace_drm_vblank_event_queued(current->pid, pipe, |
1138 | vblwait->request.sequence); | |
1139 | ||
c9a9c5e0 KH |
1140 | e->event.sequence = vblwait->request.sequence; |
1141 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1142 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1143 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1144 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1145 | } else { |
a6778e9e | 1146 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1147 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1148 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1149 | } |
1150 | ||
1151 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1152 | ||
1153 | return 0; | |
ea5d552c CW |
1154 | |
1155 | err_unlock: | |
1156 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1157 | kfree(e); | |
1158 | err_put: | |
6f331623 | 1159 | drm_vblank_put(dev, pipe); |
ea5d552c | 1160 | return ret; |
c9a9c5e0 KH |
1161 | } |
1162 | ||
1da177e4 LT |
1163 | /** |
1164 | * Wait for VBLANK. | |
1165 | * | |
1166 | * \param inode device inode. | |
6c340eac | 1167 | * \param file_priv DRM file private. |
1da177e4 LT |
1168 | * \param cmd command. |
1169 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1170 | * \return zero on success or a negative number on failure. | |
1171 | * | |
30b23634 EA |
1172 | * This function enables the vblank interrupt on the pipe requested, then |
1173 | * sleeps waiting for the requested sequence number to occur, and drops | |
1174 | * the vblank interrupt refcount afterwards. (vblank irq disable follows that | |
1175 | * after a timeout with no further vblank waits scheduled). | |
1da177e4 | 1176 | */ |
0a3e67a4 JB |
1177 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1178 | struct drm_file *file_priv) | |
1da177e4 | 1179 | { |
c153f45f | 1180 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1181 | int ret; |
19b01b5f | 1182 | unsigned int flags, seq, crtc, high_crtc; |
1da177e4 | 1183 | |
03f6509d TR |
1184 | if (drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
1185 | if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled)) | |
1186 | return -EINVAL; | |
1da177e4 | 1187 | |
30b23634 EA |
1188 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1189 | return -EINVAL; | |
1190 | ||
c153f45f | 1191 | if (vblwait->request.type & |
19b01b5f IH |
1192 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1193 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1194 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1195 | vblwait->request.type, |
19b01b5f IH |
1196 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1197 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MCA |
1198 | return -EINVAL; |
1199 | } | |
1200 | ||
c153f45f | 1201 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
19b01b5f IH |
1202 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1203 | if (high_crtc) | |
1204 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1205 | else | |
1206 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
0a3e67a4 | 1207 | if (crtc >= dev->num_crtcs) |
776c9443 MCA |
1208 | return -EINVAL; |
1209 | ||
0a3e67a4 JB |
1210 | ret = drm_vblank_get(dev, crtc); |
1211 | if (ret) { | |
8d3457ec | 1212 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1213 | return ret; |
1214 | } | |
1215 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1216 | |
c153f45f | 1217 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1218 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1219 | vblwait->request.sequence += seq; |
1220 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1221 | case _DRM_VBLANK_ABSOLUTE: |
1222 | break; | |
1223 | default: | |
0a3e67a4 JB |
1224 | ret = -EINVAL; |
1225 | goto done; | |
1da177e4 LT |
1226 | } |
1227 | ||
a6778e9e IH |
1228 | if (flags & _DRM_VBLANK_EVENT) { |
1229 | /* must hold on to the vblank ref until the event fires | |
1230 | * drm_vblank_put will be called asynchronously | |
1231 | */ | |
c9a9c5e0 | 1232 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); |
a6778e9e | 1233 | } |
c9a9c5e0 | 1234 | |
ab285d74 | 1235 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1236 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1237 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
1238 | } |
1239 | ||
30b23634 EA |
1240 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1241 | vblwait->request.sequence, crtc); | |
5380e929 | 1242 | dev->vblank[crtc].last_wait = vblwait->request.sequence; |
bfd8303a | 1243 | DRM_WAIT_ON(ret, dev->vblank[crtc].queue, 3 * HZ, |
30b23634 EA |
1244 | (((drm_vblank_count(dev, crtc) - |
1245 | vblwait->request.sequence) <= (1 << 23)) || | |
1246 | !dev->irq_enabled)); | |
1da177e4 | 1247 | |
30b23634 EA |
1248 | if (ret != -EINTR) { |
1249 | struct timeval now; | |
1da177e4 | 1250 | |
27641c3f | 1251 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1252 | vblwait->reply.tval_sec = now.tv_sec; |
1253 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1254 | |
30b23634 EA |
1255 | DRM_DEBUG("returning %d to client\n", |
1256 | vblwait->reply.sequence); | |
1da177e4 | 1257 | } else { |
30b23634 | 1258 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1259 | } |
1260 | ||
0a3e67a4 JB |
1261 | done: |
1262 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1263 | return ret; |
1264 | } | |
1265 | ||
ea7f7abc | 1266 | static void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
c9a9c5e0 KH |
1267 | { |
1268 | struct drm_pending_vblank_event *e, *t; | |
1269 | struct timeval now; | |
1270 | unsigned long flags; | |
1271 | unsigned int seq; | |
1272 | ||
27641c3f | 1273 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1274 | |
1275 | spin_lock_irqsave(&dev->event_lock, flags); | |
1276 | ||
1277 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1278 | if (e->pipe != crtc) | |
1279 | continue; | |
1280 | if ((seq - e->event.sequence) > (1<<23)) | |
1281 | continue; | |
1282 | ||
1283 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1284 | e->event.sequence, seq); | |
1285 | ||
c6eefa17 | 1286 | list_del(&e->base.link); |
c9a9c5e0 | 1287 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1288 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1289 | } |
1290 | ||
1291 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
ac2874b9 JB |
1292 | |
1293 | trace_drm_vblank_event(crtc, seq); | |
c9a9c5e0 KH |
1294 | } |
1295 | ||
0a3e67a4 JB |
1296 | /** |
1297 | * drm_handle_vblank - handle a vblank event | |
1298 | * @dev: DRM device | |
1299 | * @crtc: where this event occurred | |
1300 | * | |
1301 | * Drivers should call this routine in their vblank interrupt handlers to | |
1302 | * update the vblank counter and send any signals that may be pending. | |
1303 | */ | |
78c6e170 | 1304 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1305 | { |
27641c3f MK |
1306 | u32 vblcount; |
1307 | s64 diff_ns; | |
1308 | struct timeval tvblank; | |
1309 | unsigned long irqflags; | |
1310 | ||
c9a9c5e0 | 1311 | if (!dev->num_crtcs) |
78c6e170 | 1312 | return false; |
c9a9c5e0 | 1313 | |
27641c3f MK |
1314 | /* Need timestamp lock to prevent concurrent execution with |
1315 | * vblank enable/disable, as this would cause inconsistent | |
1316 | * or corrupted timestamps and vblank counts. | |
1317 | */ | |
1318 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
1319 | ||
1320 | /* Vblank irq handling disabled. Nothing to do. */ | |
5380e929 | 1321 | if (!dev->vblank[crtc].enabled) { |
27641c3f | 1322 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
78c6e170 | 1323 | return false; |
27641c3f MK |
1324 | } |
1325 | ||
1326 | /* Fetch corresponding timestamp for this vblank interval from | |
1327 | * driver and store it in proper slot of timestamp ringbuffer. | |
1328 | */ | |
1329 | ||
1330 | /* Get current timestamp and count. */ | |
5380e929 | 1331 | vblcount = atomic_read(&dev->vblank[crtc].count); |
27641c3f MK |
1332 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); |
1333 | ||
1334 | /* Compute time difference to timestamp of last vblank */ | |
1335 | diff_ns = timeval_to_ns(&tvblank) - | |
1336 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1337 | ||
1338 | /* Update vblank timestamp and count if at least | |
1339 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1340 | * difference between last stored timestamp and current | |
1341 | * timestamp. A smaller difference means basically | |
1342 | * identical timestamps. Happens if this vblank has | |
1343 | * been already processed and this is a redundant call, | |
1344 | * e.g., due to spurious vblank interrupts. We need to | |
1345 | * ignore those for accounting. | |
1346 | */ | |
c4cc3839 | 1347 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { |
27641c3f MK |
1348 | /* Store new timestamp in ringbuffer. */ |
1349 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
27641c3f MK |
1350 | |
1351 | /* Increment cooked vblank count. This also atomically commits | |
1352 | * the timestamp computed above. | |
1353 | */ | |
bc215128 | 1354 | smp_mb__before_atomic_inc(); |
5380e929 | 1355 | atomic_inc(&dev->vblank[crtc].count); |
bc215128 | 1356 | smp_mb__after_atomic_inc(); |
27641c3f MK |
1357 | } else { |
1358 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", | |
1359 | crtc, (int) diff_ns); | |
1360 | } | |
1361 | ||
57ed0f7b | 1362 | wake_up(&dev->vblank[crtc].queue); |
c9a9c5e0 | 1363 | drm_handle_vblank_events(dev, crtc); |
27641c3f MK |
1364 | |
1365 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
78c6e170 | 1366 | return true; |
0a3e67a4 JB |
1367 | } |
1368 | EXPORT_SYMBOL(drm_handle_vblank); |