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 | ||
36 | #include "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> |
27641c3f MK |
43 | |
44 | /* Access macro for slots in vblank timestamp ringbuffer. */ | |
45 | #define vblanktimestamp(dev, crtc, count) ( \ | |
46 | (dev)->_vblank_time[(crtc) * DRM_VBLANKTIME_RBSIZE + \ | |
47 | ((count) % DRM_VBLANKTIME_RBSIZE)]) | |
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 | { | |
91 | memset(&dev->_vblank_time[crtc * DRM_VBLANKTIME_RBSIZE], 0, | |
92 | DRM_VBLANKTIME_RBSIZE * sizeof(struct timeval)); | |
93 | } | |
94 | ||
95 | /* | |
96 | * Disable vblank irq's on crtc, make sure that last vblank count | |
97 | * of hardware and corresponding consistent software vblank counter | |
98 | * are preserved, even if there are any spurious vblank irq's after | |
99 | * disable. | |
100 | */ | |
101 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
102 | { | |
103 | unsigned long irqflags; | |
104 | u32 vblcount; | |
105 | s64 diff_ns; | |
106 | int vblrc; | |
107 | struct timeval tvblank; | |
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. | |
112 | * Disable preemption, so vblank_time_lock is held as short as | |
113 | * possible, even under a kernel with PREEMPT_RT patches. | |
114 | */ | |
115 | preempt_disable(); | |
116 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
117 | ||
118 | dev->driver->disable_vblank(dev, crtc); | |
119 | dev->vblank_enabled[crtc] = 0; | |
120 | ||
121 | /* No further vblank irq's will be processed after | |
122 | * this point. Get current hardware vblank count and | |
123 | * vblank timestamp, repeat until they are consistent. | |
124 | * | |
125 | * FIXME: There is still a race condition here and in | |
126 | * drm_update_vblank_count() which can cause off-by-one | |
127 | * reinitialization of software vblank counter. If gpu | |
128 | * vblank counter doesn't increment exactly at the leading | |
129 | * edge of a vblank interval, then we can lose 1 count if | |
130 | * we happen to execute between start of vblank and the | |
131 | * delayed gpu counter increment. | |
132 | */ | |
133 | do { | |
134 | dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc); | |
135 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); | |
136 | } while (dev->last_vblank[crtc] != dev->driver->get_vblank_counter(dev, crtc)); | |
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 | */ | |
141 | vblcount = atomic_read(&dev->_vblank_count[crtc]); | |
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)) { |
27641c3f | 158 | atomic_inc(&dev->_vblank_count[crtc]); |
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); | |
166 | preempt_enable(); | |
167 | } | |
168 | ||
0a3e67a4 JB |
169 | static void vblank_disable_fn(unsigned long arg) |
170 | { | |
171 | struct drm_device *dev = (struct drm_device *)arg; | |
172 | unsigned long irqflags; | |
173 | int i; | |
174 | ||
175 | if (!dev->vblank_disable_allowed) | |
176 | return; | |
177 | ||
178 | for (i = 0; i < dev->num_crtcs; i++) { | |
179 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
180 | if (atomic_read(&dev->vblank_refcount[i]) == 0 && | |
181 | dev->vblank_enabled[i]) { | |
182 | DRM_DEBUG("disabling vblank on crtc %d\n", i); | |
27641c3f | 183 | vblank_disable_and_save(dev, i); |
0a3e67a4 JB |
184 | } |
185 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
186 | } | |
187 | } | |
188 | ||
52440211 | 189 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 JB |
190 | { |
191 | /* Bail if the driver didn't call drm_vblank_init() */ | |
192 | if (dev->num_crtcs == 0) | |
193 | return; | |
194 | ||
195 | del_timer(&dev->vblank_disable_timer); | |
196 | ||
197 | vblank_disable_fn((unsigned long)dev); | |
198 | ||
9a298b2a EA |
199 | kfree(dev->vbl_queue); |
200 | kfree(dev->_vblank_count); | |
201 | kfree(dev->vblank_refcount); | |
202 | kfree(dev->vblank_enabled); | |
203 | kfree(dev->last_vblank); | |
204 | kfree(dev->last_vblank_wait); | |
205 | kfree(dev->vblank_inmodeset); | |
27641c3f | 206 | kfree(dev->_vblank_time); |
0a3e67a4 JB |
207 | |
208 | dev->num_crtcs = 0; | |
209 | } | |
e77cef9c | 210 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 JB |
211 | |
212 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) | |
213 | { | |
214 | int i, ret = -ENOMEM; | |
215 | ||
216 | setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, | |
217 | (unsigned long)dev); | |
218 | spin_lock_init(&dev->vbl_lock); | |
27641c3f MK |
219 | spin_lock_init(&dev->vblank_time_lock); |
220 | ||
0a3e67a4 JB |
221 | dev->num_crtcs = num_crtcs; |
222 | ||
9a298b2a EA |
223 | dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs, |
224 | GFP_KERNEL); | |
0a3e67a4 JB |
225 | if (!dev->vbl_queue) |
226 | goto err; | |
227 | ||
9a298b2a | 228 | dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL); |
0a3e67a4 JB |
229 | if (!dev->_vblank_count) |
230 | goto err; | |
231 | ||
9a298b2a EA |
232 | dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs, |
233 | GFP_KERNEL); | |
0a3e67a4 JB |
234 | if (!dev->vblank_refcount) |
235 | goto err; | |
236 | ||
9a298b2a | 237 | dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
238 | if (!dev->vblank_enabled) |
239 | goto err; | |
240 | ||
9a298b2a | 241 | dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
0a3e67a4 JB |
242 | if (!dev->last_vblank) |
243 | goto err; | |
244 | ||
9a298b2a | 245 | dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
fede5c91 EA |
246 | if (!dev->last_vblank_wait) |
247 | goto err; | |
248 | ||
9a298b2a | 249 | dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
250 | if (!dev->vblank_inmodeset) |
251 | goto err; | |
252 | ||
27641c3f MK |
253 | dev->_vblank_time = kcalloc(num_crtcs * DRM_VBLANKTIME_RBSIZE, |
254 | sizeof(struct timeval), GFP_KERNEL); | |
255 | if (!dev->_vblank_time) | |
256 | goto err; | |
257 | ||
258 | DRM_INFO("Supports vblank timestamp caching Rev 1 (10.10.2010).\n"); | |
259 | ||
260 | /* Driver specific high-precision vblank timestamping supported? */ | |
261 | if (dev->driver->get_vblank_timestamp) | |
262 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
263 | else | |
264 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
265 | ||
0a3e67a4 JB |
266 | /* Zero per-crtc vblank stuff */ |
267 | for (i = 0; i < num_crtcs; i++) { | |
268 | init_waitqueue_head(&dev->vbl_queue[i]); | |
0a3e67a4 JB |
269 | atomic_set(&dev->_vblank_count[i], 0); |
270 | atomic_set(&dev->vblank_refcount[i], 0); | |
271 | } | |
272 | ||
273 | dev->vblank_disable_allowed = 0; | |
0a3e67a4 JB |
274 | return 0; |
275 | ||
276 | err: | |
277 | drm_vblank_cleanup(dev); | |
278 | return ret; | |
279 | } | |
280 | EXPORT_SYMBOL(drm_vblank_init); | |
281 | ||
28d52043 DA |
282 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
283 | { | |
284 | struct drm_device *dev = cookie; | |
285 | ||
286 | if (dev->driver->vgaarb_irq) { | |
287 | dev->driver->vgaarb_irq(dev, state); | |
288 | return; | |
289 | } | |
290 | ||
291 | if (!dev->irq_enabled) | |
292 | return; | |
293 | ||
294 | if (state) | |
295 | dev->driver->irq_uninstall(dev); | |
296 | else { | |
297 | dev->driver->irq_preinstall(dev); | |
298 | dev->driver->irq_postinstall(dev); | |
299 | } | |
300 | } | |
301 | ||
1da177e4 LT |
302 | /** |
303 | * Install IRQ handler. | |
304 | * | |
305 | * \param dev DRM device. | |
1da177e4 | 306 | * |
0a3e67a4 | 307 | * Initializes the IRQ related data. Installs the handler, calling the driver |
1da177e4 LT |
308 | * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions |
309 | * before and after the installation. | |
310 | */ | |
0a3e67a4 | 311 | int drm_irq_install(struct drm_device *dev) |
1da177e4 | 312 | { |
0a3e67a4 | 313 | int ret = 0; |
b5e89ed5 | 314 | unsigned long sh_flags = 0; |
b8da7de5 | 315 | char *irqname; |
1da177e4 LT |
316 | |
317 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
318 | return -EINVAL; | |
319 | ||
dcdb1674 | 320 | if (drm_dev_to_irq(dev) == 0) |
1da177e4 LT |
321 | return -EINVAL; |
322 | ||
30e2fb18 | 323 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
324 | |
325 | /* Driver must have been initialized */ | |
b5e89ed5 | 326 | if (!dev->dev_private) { |
30e2fb18 | 327 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
328 | return -EINVAL; |
329 | } | |
330 | ||
b5e89ed5 | 331 | if (dev->irq_enabled) { |
30e2fb18 | 332 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
333 | return -EBUSY; |
334 | } | |
335 | dev->irq_enabled = 1; | |
30e2fb18 | 336 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 337 | |
dcdb1674 | 338 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
1da177e4 | 339 | |
b5e89ed5 | 340 | /* Before installing handler */ |
1da177e4 LT |
341 | dev->driver->irq_preinstall(dev); |
342 | ||
b5e89ed5 | 343 | /* Install handler */ |
1da177e4 | 344 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 345 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 346 | |
b8da7de5 DA |
347 | if (dev->devname) |
348 | irqname = dev->devname; | |
349 | else | |
350 | irqname = dev->driver->name; | |
351 | ||
9bfbd5cb | 352 | ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, |
b8da7de5 | 353 | sh_flags, irqname, dev); |
9bfbd5cb | 354 | |
b5e89ed5 | 355 | if (ret < 0) { |
30e2fb18 | 356 | mutex_lock(&dev->struct_mutex); |
1da177e4 | 357 | dev->irq_enabled = 0; |
30e2fb18 | 358 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
359 | return ret; |
360 | } | |
361 | ||
28d52043 DA |
362 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
363 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
364 | ||
b5e89ed5 | 365 | /* After installing handler */ |
0a3e67a4 JB |
366 | ret = dev->driver->irq_postinstall(dev); |
367 | if (ret < 0) { | |
368 | mutex_lock(&dev->struct_mutex); | |
369 | dev->irq_enabled = 0; | |
370 | mutex_unlock(&dev->struct_mutex); | |
371 | } | |
1da177e4 | 372 | |
0a3e67a4 | 373 | return ret; |
1da177e4 | 374 | } |
0a3e67a4 | 375 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
376 | |
377 | /** | |
378 | * Uninstall the IRQ handler. | |
379 | * | |
380 | * \param dev DRM device. | |
381 | * | |
382 | * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq. | |
383 | */ | |
27641c3f | 384 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 385 | { |
dc1336ff JB |
386 | unsigned long irqflags; |
387 | int irq_enabled, i; | |
1da177e4 LT |
388 | |
389 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
390 | return -EINVAL; | |
391 | ||
30e2fb18 | 392 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
393 | irq_enabled = dev->irq_enabled; |
394 | dev->irq_enabled = 0; | |
30e2fb18 | 395 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 396 | |
dc1336ff JB |
397 | /* |
398 | * Wake up any waiters so they don't hang. | |
399 | */ | |
400 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
401 | for (i = 0; i < dev->num_crtcs; i++) { | |
402 | DRM_WAKEUP(&dev->vbl_queue[i]); | |
403 | dev->vblank_enabled[i] = 0; | |
14d200c5 | 404 | dev->last_vblank[i] = dev->driver->get_vblank_counter(dev, i); |
dc1336ff JB |
405 | } |
406 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
407 | ||
b5e89ed5 | 408 | if (!irq_enabled) |
1da177e4 LT |
409 | return -EINVAL; |
410 | ||
dcdb1674 | 411 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
1da177e4 | 412 | |
28d52043 DA |
413 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
414 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
415 | ||
1da177e4 LT |
416 | dev->driver->irq_uninstall(dev); |
417 | ||
dcdb1674 | 418 | free_irq(drm_dev_to_irq(dev), dev); |
1da177e4 LT |
419 | |
420 | return 0; | |
421 | } | |
422 | EXPORT_SYMBOL(drm_irq_uninstall); | |
423 | ||
424 | /** | |
425 | * IRQ control ioctl. | |
426 | * | |
427 | * \param inode device inode. | |
6c340eac | 428 | * \param file_priv DRM file private. |
1da177e4 LT |
429 | * \param cmd command. |
430 | * \param arg user argument, pointing to a drm_control structure. | |
431 | * \return zero on success or a negative number on failure. | |
432 | * | |
433 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
434 | */ | |
c153f45f EA |
435 | int drm_control(struct drm_device *dev, void *data, |
436 | struct drm_file *file_priv) | |
1da177e4 | 437 | { |
c153f45f | 438 | struct drm_control *ctl = data; |
b5e89ed5 | 439 | |
27641c3f MK |
440 | /* if we haven't irq we fallback for compatibility reasons - |
441 | * this used to be a separate function in drm_dma.h | |
442 | */ | |
1da177e4 | 443 | |
1da177e4 | 444 | |
c153f45f | 445 | switch (ctl->func) { |
1da177e4 LT |
446 | case DRM_INST_HANDLER: |
447 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
448 | return 0; | |
f453ba04 DA |
449 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
450 | return 0; | |
1da177e4 | 451 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
dcdb1674 | 452 | ctl->irq != drm_dev_to_irq(dev)) |
1da177e4 | 453 | return -EINVAL; |
b5e89ed5 | 454 | return drm_irq_install(dev); |
1da177e4 LT |
455 | case DRM_UNINST_HANDLER: |
456 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
457 | return 0; | |
f453ba04 DA |
458 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
459 | return 0; | |
b5e89ed5 | 460 | return drm_irq_uninstall(dev); |
1da177e4 LT |
461 | default: |
462 | return -EINVAL; | |
463 | } | |
464 | } | |
465 | ||
27641c3f MK |
466 | /** |
467 | * drm_calc_timestamping_constants - Calculate and | |
468 | * store various constants which are later needed by | |
469 | * vblank and swap-completion timestamping, e.g, by | |
470 | * drm_calc_vbltimestamp_from_scanoutpos(). | |
471 | * They are derived from crtc's true scanout timing, | |
472 | * so they take things like panel scaling or other | |
473 | * adjustments into account. | |
474 | * | |
475 | * @crtc drm_crtc whose timestamp constants should be updated. | |
476 | * | |
477 | */ | |
478 | void drm_calc_timestamping_constants(struct drm_crtc *crtc) | |
479 | { | |
480 | s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; | |
481 | u64 dotclock; | |
482 | ||
483 | /* Dot clock in Hz: */ | |
484 | dotclock = (u64) crtc->hwmode.clock * 1000; | |
485 | ||
9be6f8a9 MK |
486 | /* Fields of interlaced scanout modes are only halve a frame duration. |
487 | * Double the dotclock to get halve the frame-/line-/pixelduration. | |
488 | */ | |
489 | if (crtc->hwmode.flags & DRM_MODE_FLAG_INTERLACE) | |
490 | dotclock *= 2; | |
491 | ||
27641c3f MK |
492 | /* Valid dotclock? */ |
493 | if (dotclock > 0) { | |
494 | /* Convert scanline length in pixels and video dot clock to | |
495 | * line duration, frame duration and pixel duration in | |
496 | * nanoseconds: | |
497 | */ | |
498 | pixeldur_ns = (s64) div64_u64(1000000000, dotclock); | |
499 | linedur_ns = (s64) div64_u64(((u64) crtc->hwmode.crtc_htotal * | |
500 | 1000000000), dotclock); | |
501 | framedur_ns = (s64) crtc->hwmode.crtc_vtotal * linedur_ns; | |
502 | } else | |
503 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", | |
504 | crtc->base.id); | |
505 | ||
506 | crtc->pixeldur_ns = pixeldur_ns; | |
507 | crtc->linedur_ns = linedur_ns; | |
508 | crtc->framedur_ns = framedur_ns; | |
509 | ||
510 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
511 | crtc->base.id, crtc->hwmode.crtc_htotal, | |
512 | crtc->hwmode.crtc_vtotal, crtc->hwmode.crtc_vdisplay); | |
513 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", | |
514 | crtc->base.id, (int) dotclock/1000, (int) framedur_ns, | |
515 | (int) linedur_ns, (int) pixeldur_ns); | |
516 | } | |
517 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
518 | ||
519 | /** | |
520 | * drm_calc_vbltimestamp_from_scanoutpos - helper routine for kms | |
521 | * drivers. Implements calculation of exact vblank timestamps from | |
522 | * given drm_display_mode timings and current video scanout position | |
523 | * of a crtc. This can be called from within get_vblank_timestamp() | |
524 | * implementation of a kms driver to implement the actual timestamping. | |
525 | * | |
526 | * Should return timestamps conforming to the OML_sync_control OpenML | |
527 | * extension specification. The timestamp corresponds to the end of | |
528 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
529 | * pixel in the following video frame. | |
530 | * | |
531 | * Requires support for optional dev->driver->get_scanout_position() | |
532 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
533 | * that corresponds to the true scanout timing. | |
534 | * | |
535 | * The current implementation only handles standard video modes. It | |
536 | * returns as no operation if a doublescan or interlaced video mode is | |
537 | * active. Higher level code is expected to handle this. | |
538 | * | |
539 | * @dev: DRM device. | |
540 | * @crtc: Which crtc's vblank timestamp to retrieve. | |
541 | * @max_error: Desired maximum allowable error in timestamps (nanosecs). | |
542 | * On return contains true maximum error of timestamp. | |
543 | * @vblank_time: Pointer to struct timeval which should receive the timestamp. | |
544 | * @flags: Flags to pass to driver: | |
545 | * 0 = Default. | |
546 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. | |
547 | * @refcrtc: drm_crtc* of crtc which defines scanout timing. | |
548 | * | |
549 | * Returns negative value on error, failure or if not supported in current | |
550 | * video mode: | |
551 | * | |
552 | * -EINVAL - Invalid crtc. | |
553 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. | |
554 | * -ENOTSUPP - Function not supported in current display mode. | |
555 | * -EIO - Failed, e.g., due to failed scanout position query. | |
556 | * | |
557 | * Returns or'ed positive status flags on success: | |
558 | * | |
559 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
560 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
561 | * | |
562 | */ | |
563 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, | |
564 | int *max_error, | |
565 | struct timeval *vblank_time, | |
566 | unsigned flags, | |
567 | struct drm_crtc *refcrtc) | |
568 | { | |
569 | struct timeval stime, raw_time; | |
570 | struct drm_display_mode *mode; | |
571 | int vbl_status, vtotal, vdisplay; | |
572 | int vpos, hpos, i; | |
573 | s64 framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; | |
574 | bool invbl; | |
575 | ||
576 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
577 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
578 | return -EINVAL; | |
579 | } | |
580 | ||
581 | /* Scanout position query not supported? Should not happen. */ | |
582 | if (!dev->driver->get_scanout_position) { | |
583 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
584 | return -EIO; | |
585 | } | |
586 | ||
587 | mode = &refcrtc->hwmode; | |
588 | vtotal = mode->crtc_vtotal; | |
589 | vdisplay = mode->crtc_vdisplay; | |
590 | ||
591 | /* Durations of frames, lines, pixels in nanoseconds. */ | |
592 | framedur_ns = refcrtc->framedur_ns; | |
593 | linedur_ns = refcrtc->linedur_ns; | |
594 | pixeldur_ns = refcrtc->pixeldur_ns; | |
595 | ||
596 | /* If mode timing undefined, just return as no-op: | |
597 | * Happens during initial modesetting of a crtc. | |
598 | */ | |
599 | if (vtotal <= 0 || vdisplay <= 0 || framedur_ns == 0) { | |
600 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); | |
601 | return -EAGAIN; | |
602 | } | |
603 | ||
27641c3f MK |
604 | /* Get current scanout position with system timestamp. |
605 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
606 | * if single query takes longer than max_error nanoseconds. | |
607 | * | |
608 | * This guarantees a tight bound on maximum error if | |
609 | * code gets preempted or delayed for some reason. | |
610 | */ | |
611 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
612 | /* Disable preemption to make it very likely to | |
613 | * succeed in the first iteration even on PREEMPT_RT kernel. | |
614 | */ | |
615 | preempt_disable(); | |
616 | ||
617 | /* Get system timestamp before query. */ | |
618 | do_gettimeofday(&stime); | |
619 | ||
620 | /* Get vertical and horizontal scanout pos. vpos, hpos. */ | |
621 | vbl_status = dev->driver->get_scanout_position(dev, crtc, &vpos, &hpos); | |
622 | ||
623 | /* Get system timestamp after query. */ | |
624 | do_gettimeofday(&raw_time); | |
625 | ||
626 | preempt_enable(); | |
627 | ||
628 | /* Return as no-op if scanout query unsupported or failed. */ | |
629 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
630 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
631 | crtc, vbl_status); | |
632 | return -EIO; | |
633 | } | |
634 | ||
635 | duration_ns = timeval_to_ns(&raw_time) - timeval_to_ns(&stime); | |
636 | ||
637 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
638 | if (duration_ns <= (s64) *max_error) | |
639 | break; | |
640 | } | |
641 | ||
642 | /* Noisy system timing? */ | |
643 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
644 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
645 | crtc, (int) duration_ns/1000, *max_error/1000, i); | |
646 | } | |
647 | ||
648 | /* Return upper bound of timestamp precision error. */ | |
649 | *max_error = (int) duration_ns; | |
650 | ||
651 | /* Check if in vblank area: | |
652 | * vpos is >=0 in video scanout area, but negative | |
653 | * within vblank area, counting down the number of lines until | |
654 | * start of scanout. | |
655 | */ | |
656 | invbl = vbl_status & DRM_SCANOUTPOS_INVBL; | |
657 | ||
658 | /* Convert scanout position into elapsed time at raw_time query | |
659 | * since start of scanout at first display scanline. delta_ns | |
660 | * can be negative if start of scanout hasn't happened yet. | |
661 | */ | |
662 | delta_ns = (s64) vpos * linedur_ns + (s64) hpos * pixeldur_ns; | |
663 | ||
664 | /* Is vpos outside nominal vblank area, but less than | |
665 | * 1/100 of a frame height away from start of vblank? | |
666 | * If so, assume this isn't a massively delayed vblank | |
667 | * interrupt, but a vblank interrupt that fired a few | |
668 | * microseconds before true start of vblank. Compensate | |
669 | * by adding a full frame duration to the final timestamp. | |
670 | * Happens, e.g., on ATI R500, R600. | |
671 | * | |
672 | * We only do this if DRM_CALLED_FROM_VBLIRQ. | |
673 | */ | |
674 | if ((flags & DRM_CALLED_FROM_VBLIRQ) && !invbl && | |
675 | ((vdisplay - vpos) < vtotal / 100)) { | |
676 | delta_ns = delta_ns - framedur_ns; | |
677 | ||
678 | /* Signal this correction as "applied". */ | |
679 | vbl_status |= 0x8; | |
680 | } | |
681 | ||
682 | /* Subtract time delta from raw timestamp to get final | |
683 | * vblank_time timestamp for end of vblank. | |
684 | */ | |
685 | *vblank_time = ns_to_timeval(timeval_to_ns(&raw_time) - delta_ns); | |
686 | ||
687 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %d.%d -> %d.%d [e %d us, %d rep]\n", | |
688 | crtc, (int) vbl_status, hpos, vpos, raw_time.tv_sec, | |
689 | raw_time.tv_usec, vblank_time->tv_sec, vblank_time->tv_usec, | |
690 | (int) duration_ns/1000, i); | |
691 | ||
692 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
693 | if (invbl) | |
694 | vbl_status |= DRM_VBLANKTIME_INVBL; | |
695 | ||
696 | return vbl_status; | |
697 | } | |
698 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
699 | ||
700 | /** | |
701 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
702 | * vblank interval. | |
703 | * | |
704 | * @dev: DRM device | |
705 | * @crtc: which crtc's vblank timestamp to retrieve | |
706 | * @tvblank: Pointer to target struct timeval which should receive the timestamp | |
707 | * @flags: Flags to pass to driver: | |
708 | * 0 = Default. | |
709 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. | |
710 | * | |
711 | * Fetches the system timestamp corresponding to the time of the most recent | |
712 | * vblank interval on specified crtc. May call into kms-driver to | |
713 | * compute the timestamp with a high-precision GPU specific method. | |
714 | * | |
715 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
716 | * call, i.e., it isn't very precisely locked to the true vblank. | |
717 | * | |
718 | * Returns non-zero if timestamp is considered to be very precise. | |
719 | */ | |
720 | u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
721 | struct timeval *tvblank, unsigned flags) | |
722 | { | |
723 | int ret = 0; | |
724 | ||
725 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
726 | int max_error = (int) drm_timestamp_precision * 1000; | |
727 | ||
728 | /* Query driver if possible and precision timestamping enabled. */ | |
729 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
730 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
731 | tvblank, flags); | |
732 | if (ret > 0) | |
733 | return (u32) ret; | |
734 | } | |
735 | ||
736 | /* GPU high precision timestamp query unsupported or failed. | |
737 | * Return gettimeofday timestamp as best estimate. | |
738 | */ | |
739 | do_gettimeofday(tvblank); | |
740 | ||
741 | return 0; | |
742 | } | |
743 | EXPORT_SYMBOL(drm_get_last_vbltimestamp); | |
744 | ||
0a3e67a4 JB |
745 | /** |
746 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
747 | * @dev: DRM device | |
748 | * @crtc: which counter to retrieve | |
749 | * | |
750 | * Fetches the "cooked" vblank count value that represents the number of | |
751 | * vblank events since the system was booted, including lost events due to | |
752 | * modesetting activity. | |
753 | */ | |
754 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
755 | { | |
756 | return atomic_read(&dev->_vblank_count[crtc]); | |
757 | } | |
758 | EXPORT_SYMBOL(drm_vblank_count); | |
759 | ||
27641c3f MK |
760 | /** |
761 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
762 | * and the system timestamp corresponding to that vblank counter value. | |
763 | * | |
764 | * @dev: DRM device | |
765 | * @crtc: which counter to retrieve | |
766 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
767 | * | |
768 | * Fetches the "cooked" vblank count value that represents the number of | |
769 | * vblank events since the system was booted, including lost events due to | |
770 | * modesetting activity. Returns corresponding system timestamp of the time | |
771 | * of the vblank interval that corresponds to the current value vblank counter | |
772 | * value. | |
773 | */ | |
774 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
775 | struct timeval *vblanktime) | |
776 | { | |
777 | u32 cur_vblank; | |
778 | ||
779 | /* Read timestamp from slot of _vblank_time ringbuffer | |
780 | * that corresponds to current vblank count. Retry if | |
781 | * count has incremented during readout. This works like | |
782 | * a seqlock. | |
783 | */ | |
784 | do { | |
785 | cur_vblank = atomic_read(&dev->_vblank_count[crtc]); | |
786 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); | |
787 | smp_rmb(); | |
788 | } while (cur_vblank != atomic_read(&dev->_vblank_count[crtc])); | |
789 | ||
790 | return cur_vblank; | |
791 | } | |
792 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
793 | ||
0a3e67a4 JB |
794 | /** |
795 | * drm_update_vblank_count - update the master vblank counter | |
796 | * @dev: DRM device | |
797 | * @crtc: counter to update | |
798 | * | |
799 | * Call back into the driver to update the appropriate vblank counter | |
800 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
801 | * update the last read value so we can deal with wraparound on the next | |
802 | * call if necessary. | |
803 | * | |
804 | * Only necessary when going from off->on, to account for frames we | |
805 | * didn't get an interrupt for. | |
806 | * | |
807 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
808 | * device vblank fields. | |
809 | */ | |
810 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
811 | { | |
27641c3f MK |
812 | u32 cur_vblank, diff, tslot, rc; |
813 | struct timeval t_vblank; | |
0a3e67a4 JB |
814 | |
815 | /* | |
816 | * Interrupts were disabled prior to this call, so deal with counter | |
817 | * wrap if needed. | |
818 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
819 | * here if the register is small or we had vblank interrupts off for | |
820 | * a long time. | |
27641c3f MK |
821 | * |
822 | * We repeat the hardware vblank counter & timestamp query until | |
823 | * we get consistent results. This to prevent races between gpu | |
824 | * updating its hardware counter while we are retrieving the | |
825 | * corresponding vblank timestamp. | |
0a3e67a4 | 826 | */ |
27641c3f MK |
827 | do { |
828 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
829 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
830 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
831 | ||
832 | /* Deal with counter wrap */ | |
0a3e67a4 JB |
833 | diff = cur_vblank - dev->last_vblank[crtc]; |
834 | if (cur_vblank < dev->last_vblank[crtc]) { | |
835 | diff += dev->max_vblank_count; | |
836 | ||
837 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
838 | crtc, dev->last_vblank[crtc], cur_vblank, diff); | |
839 | } | |
840 | ||
841 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", | |
842 | crtc, diff); | |
843 | ||
27641c3f MK |
844 | /* Reinitialize corresponding vblank timestamp if high-precision query |
845 | * available. Skip this step if query unsupported or failed. Will | |
846 | * reinitialize delayed at next vblank interrupt in that case. | |
847 | */ | |
848 | if (rc) { | |
849 | tslot = atomic_read(&dev->_vblank_count[crtc]) + diff; | |
850 | vblanktimestamp(dev, crtc, tslot) = t_vblank; | |
27641c3f MK |
851 | } |
852 | ||
bc215128 | 853 | smp_mb__before_atomic_inc(); |
0a3e67a4 | 854 | atomic_add(diff, &dev->_vblank_count[crtc]); |
bc215128 | 855 | smp_mb__after_atomic_inc(); |
0a3e67a4 JB |
856 | } |
857 | ||
858 | /** | |
859 | * drm_vblank_get - get a reference count on vblank events | |
860 | * @dev: DRM device | |
861 | * @crtc: which CRTC to own | |
862 | * | |
863 | * Acquire a reference count on vblank events to avoid having them disabled | |
864 | * while in use. | |
865 | * | |
866 | * RETURNS | |
867 | * Zero on success, nonzero on failure. | |
868 | */ | |
869 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
870 | { | |
27641c3f | 871 | unsigned long irqflags, irqflags2; |
0a3e67a4 JB |
872 | int ret = 0; |
873 | ||
874 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
875 | /* Going from 0->1 means we have to enable interrupts again */ | |
778c9026 | 876 | if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) { |
27641c3f MK |
877 | /* Disable preemption while holding vblank_time_lock. Do |
878 | * it explicitely to guard against PREEMPT_RT kernel. | |
879 | */ | |
880 | preempt_disable(); | |
881 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags2); | |
778c9026 | 882 | if (!dev->vblank_enabled[crtc]) { |
27641c3f MK |
883 | /* Enable vblank irqs under vblank_time_lock protection. |
884 | * All vblank count & timestamp updates are held off | |
885 | * until we are done reinitializing master counter and | |
886 | * timestamps. Filtercode in drm_handle_vblank() will | |
887 | * prevent double-accounting of same vblank interval. | |
888 | */ | |
778c9026 | 889 | ret = dev->driver->enable_vblank(dev, crtc); |
27641c3f MK |
890 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", |
891 | crtc, ret); | |
778c9026 LP |
892 | if (ret) |
893 | atomic_dec(&dev->vblank_refcount[crtc]); | |
894 | else { | |
895 | dev->vblank_enabled[crtc] = 1; | |
896 | drm_update_vblank_count(dev, crtc); | |
897 | } | |
898 | } | |
27641c3f MK |
899 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2); |
900 | preempt_enable(); | |
778c9026 LP |
901 | } else { |
902 | if (!dev->vblank_enabled[crtc]) { | |
0a3e67a4 | 903 | atomic_dec(&dev->vblank_refcount[crtc]); |
778c9026 | 904 | ret = -EINVAL; |
0a3e67a4 JB |
905 | } |
906 | } | |
907 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
908 | ||
909 | return ret; | |
910 | } | |
911 | EXPORT_SYMBOL(drm_vblank_get); | |
912 | ||
913 | /** | |
914 | * drm_vblank_put - give up ownership of vblank events | |
915 | * @dev: DRM device | |
916 | * @crtc: which counter to give up | |
917 | * | |
918 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 919 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
0a3e67a4 JB |
920 | */ |
921 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
922 | { | |
27641c3f | 923 | BUG_ON(atomic_read(&dev->vblank_refcount[crtc]) == 0); |
b3f5e732 | 924 | |
0a3e67a4 | 925 | /* Last user schedules interrupt disable */ |
27641c3f MK |
926 | if (atomic_dec_and_test(&dev->vblank_refcount[crtc]) && |
927 | (drm_vblank_offdelay > 0)) | |
928 | mod_timer(&dev->vblank_disable_timer, | |
929 | jiffies + ((drm_vblank_offdelay * DRM_HZ)/1000)); | |
0a3e67a4 JB |
930 | } |
931 | EXPORT_SYMBOL(drm_vblank_put); | |
932 | ||
778c9026 LP |
933 | void drm_vblank_off(struct drm_device *dev, int crtc) |
934 | { | |
498548ec CJHR |
935 | struct drm_pending_vblank_event *e, *t; |
936 | struct timeval now; | |
778c9026 | 937 | unsigned long irqflags; |
498548ec | 938 | unsigned int seq; |
778c9026 LP |
939 | |
940 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
27641c3f | 941 | vblank_disable_and_save(dev, crtc); |
778c9026 | 942 | DRM_WAKEUP(&dev->vbl_queue[crtc]); |
498548ec CJHR |
943 | |
944 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
945 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
946 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
947 | if (e->pipe != crtc) | |
948 | continue; | |
949 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
950 | wanted %d, current %d\n", | |
951 | e->event.sequence, seq); | |
952 | ||
953 | e->event.sequence = seq; | |
954 | e->event.tv_sec = now.tv_sec; | |
955 | e->event.tv_usec = now.tv_usec; | |
956 | drm_vblank_put(dev, e->pipe); | |
957 | list_move_tail(&e->base.link, &e->base.file_priv->event_list); | |
958 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
959 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
960 | e->event.sequence); | |
961 | } | |
962 | ||
778c9026 LP |
963 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
964 | } | |
965 | EXPORT_SYMBOL(drm_vblank_off); | |
966 | ||
f453ba04 DA |
967 | /** |
968 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
969 | * @dev: DRM device | |
970 | * @crtc: CRTC in question | |
971 | * @post: post or pre mode set? | |
972 | * | |
973 | * Account for vblank events across mode setting events, which will likely | |
974 | * reset the hardware frame counter. | |
975 | */ | |
976 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
977 | { | |
e77cef9c JG |
978 | /* vblank is not initialized (IRQ not installed ?) */ |
979 | if (!dev->num_crtcs) | |
980 | return; | |
f453ba04 DA |
981 | /* |
982 | * To avoid all the problems that might happen if interrupts | |
983 | * were enabled/disabled around or between these calls, we just | |
984 | * have the kernel take a reference on the CRTC (just once though | |
985 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
986 | * so that interrupts remain enabled in the interim. | |
987 | */ | |
988 | if (!dev->vblank_inmodeset[crtc]) { | |
b3f5e732 CW |
989 | dev->vblank_inmodeset[crtc] = 0x1; |
990 | if (drm_vblank_get(dev, crtc) == 0) | |
991 | dev->vblank_inmodeset[crtc] |= 0x2; | |
f453ba04 DA |
992 | } |
993 | } | |
994 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
995 | ||
996 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) | |
997 | { | |
998 | unsigned long irqflags; | |
999 | ||
1000 | if (dev->vblank_inmodeset[crtc]) { | |
1001 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1002 | dev->vblank_disable_allowed = 1; | |
f453ba04 | 1003 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 CW |
1004 | |
1005 | if (dev->vblank_inmodeset[crtc] & 0x2) | |
1006 | drm_vblank_put(dev, crtc); | |
1007 | ||
1008 | dev->vblank_inmodeset[crtc] = 0; | |
f453ba04 DA |
1009 | } |
1010 | } | |
1011 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1012 | ||
0a3e67a4 JB |
1013 | /** |
1014 | * drm_modeset_ctl - handle vblank event counter changes across mode switch | |
1015 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1016 | * | |
1017 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1018 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1019 | * | |
1020 | * Generally the counter will reset across mode sets. If interrupts are | |
1021 | * enabled around this call, we don't have to do anything since the counter | |
1022 | * will have already been incremented. | |
1023 | */ | |
1024 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1025 | struct drm_file *file_priv) | |
1026 | { | |
1027 | struct drm_modeset_ctl *modeset = data; | |
19227561 DA |
1028 | int ret = 0; |
1029 | unsigned int crtc; | |
0a3e67a4 JB |
1030 | |
1031 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1032 | if (!dev->num_crtcs) | |
1033 | goto out; | |
1034 | ||
1035 | crtc = modeset->crtc; | |
1036 | if (crtc >= dev->num_crtcs) { | |
1037 | ret = -EINVAL; | |
1038 | goto out; | |
1039 | } | |
1040 | ||
0a3e67a4 JB |
1041 | switch (modeset->cmd) { |
1042 | case _DRM_PRE_MODESET: | |
f453ba04 | 1043 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1044 | break; |
1045 | case _DRM_POST_MODESET: | |
f453ba04 | 1046 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1047 | break; |
1048 | default: | |
1049 | ret = -EINVAL; | |
1050 | break; | |
1051 | } | |
1052 | ||
1053 | out: | |
1054 | return ret; | |
1055 | } | |
1056 | ||
c9a9c5e0 KH |
1057 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1058 | union drm_wait_vblank *vblwait, | |
1059 | struct drm_file *file_priv) | |
1060 | { | |
1061 | struct drm_pending_vblank_event *e; | |
1062 | struct timeval now; | |
1063 | unsigned long flags; | |
1064 | unsigned int seq; | |
ea5d552c | 1065 | int ret; |
c9a9c5e0 KH |
1066 | |
1067 | e = kzalloc(sizeof *e, GFP_KERNEL); | |
ea5d552c CW |
1068 | if (e == NULL) { |
1069 | ret = -ENOMEM; | |
1070 | goto err_put; | |
1071 | } | |
c9a9c5e0 KH |
1072 | |
1073 | e->pipe = pipe; | |
b9c2c9ae | 1074 | e->base.pid = current->pid; |
c9a9c5e0 KH |
1075 | e->event.base.type = DRM_EVENT_VBLANK; |
1076 | e->event.base.length = sizeof e->event; | |
1077 | e->event.user_data = vblwait->request.signal; | |
1078 | e->base.event = &e->event.base; | |
1079 | e->base.file_priv = file_priv; | |
1080 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1081 | ||
c9a9c5e0 KH |
1082 | spin_lock_irqsave(&dev->event_lock, flags); |
1083 | ||
1084 | if (file_priv->event_space < sizeof e->event) { | |
ea5d552c CW |
1085 | ret = -EBUSY; |
1086 | goto err_unlock; | |
c9a9c5e0 KH |
1087 | } |
1088 | ||
1089 | file_priv->event_space -= sizeof e->event; | |
27641c3f MK |
1090 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1091 | ||
c9a9c5e0 KH |
1092 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1093 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1094 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1095 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1096 | } |
1097 | ||
1098 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1099 | vblwait->request.sequence, seq, pipe); | |
1100 | ||
b9c2c9ae JB |
1101 | trace_drm_vblank_event_queued(current->pid, pipe, |
1102 | vblwait->request.sequence); | |
1103 | ||
c9a9c5e0 KH |
1104 | e->event.sequence = vblwait->request.sequence; |
1105 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
000fa7cf | 1106 | e->event.sequence = seq; |
c9a9c5e0 KH |
1107 | e->event.tv_sec = now.tv_sec; |
1108 | e->event.tv_usec = now.tv_usec; | |
6f331623 | 1109 | drm_vblank_put(dev, pipe); |
c9a9c5e0 KH |
1110 | list_add_tail(&e->base.link, &e->base.file_priv->event_list); |
1111 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
000fa7cf | 1112 | vblwait->reply.sequence = seq; |
b9c2c9ae JB |
1113 | trace_drm_vblank_event_delivered(current->pid, pipe, |
1114 | vblwait->request.sequence); | |
c9a9c5e0 KH |
1115 | } else { |
1116 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
000fa7cf | 1117 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1118 | } |
1119 | ||
1120 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1121 | ||
1122 | return 0; | |
ea5d552c CW |
1123 | |
1124 | err_unlock: | |
1125 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1126 | kfree(e); | |
1127 | err_put: | |
6f331623 | 1128 | drm_vblank_put(dev, pipe); |
ea5d552c | 1129 | return ret; |
c9a9c5e0 KH |
1130 | } |
1131 | ||
1da177e4 LT |
1132 | /** |
1133 | * Wait for VBLANK. | |
1134 | * | |
1135 | * \param inode device inode. | |
6c340eac | 1136 | * \param file_priv DRM file private. |
1da177e4 LT |
1137 | * \param cmd command. |
1138 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1139 | * \return zero on success or a negative number on failure. | |
1140 | * | |
30b23634 EA |
1141 | * This function enables the vblank interrupt on the pipe requested, then |
1142 | * sleeps waiting for the requested sequence number to occur, and drops | |
1143 | * the vblank interrupt refcount afterwards. (vblank irq disable follows that | |
1144 | * after a timeout with no further vblank waits scheduled). | |
1da177e4 | 1145 | */ |
0a3e67a4 JB |
1146 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1147 | struct drm_file *file_priv) | |
1da177e4 | 1148 | { |
c153f45f | 1149 | union drm_wait_vblank *vblwait = data; |
1da177e4 | 1150 | int ret = 0; |
19b01b5f | 1151 | unsigned int flags, seq, crtc, high_crtc; |
1da177e4 | 1152 | |
dcdb1674 | 1153 | if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled)) |
1da177e4 LT |
1154 | return -EINVAL; |
1155 | ||
30b23634 EA |
1156 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1157 | return -EINVAL; | |
1158 | ||
c153f45f | 1159 | if (vblwait->request.type & |
19b01b5f IH |
1160 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1161 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1162 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1163 | vblwait->request.type, |
19b01b5f IH |
1164 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1165 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MD |
1166 | return -EINVAL; |
1167 | } | |
1168 | ||
c153f45f | 1169 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
19b01b5f IH |
1170 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1171 | if (high_crtc) | |
1172 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1173 | else | |
1174 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
0a3e67a4 | 1175 | if (crtc >= dev->num_crtcs) |
776c9443 MD |
1176 | return -EINVAL; |
1177 | ||
0a3e67a4 JB |
1178 | ret = drm_vblank_get(dev, crtc); |
1179 | if (ret) { | |
8d3457ec | 1180 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1181 | return ret; |
1182 | } | |
1183 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1184 | |
c153f45f | 1185 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1186 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1187 | vblwait->request.sequence += seq; |
1188 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1189 | case _DRM_VBLANK_ABSOLUTE: |
1190 | break; | |
1191 | default: | |
0a3e67a4 JB |
1192 | ret = -EINVAL; |
1193 | goto done; | |
1da177e4 LT |
1194 | } |
1195 | ||
c9a9c5e0 KH |
1196 | if (flags & _DRM_VBLANK_EVENT) |
1197 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); | |
1198 | ||
ab285d74 | 1199 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1200 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1201 | vblwait->request.sequence = seq + 1; | |
ab285d74 MD |
1202 | } |
1203 | ||
30b23634 EA |
1204 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1205 | vblwait->request.sequence, crtc); | |
1206 | dev->last_vblank_wait[crtc] = vblwait->request.sequence; | |
1207 | DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ, | |
1208 | (((drm_vblank_count(dev, crtc) - | |
1209 | vblwait->request.sequence) <= (1 << 23)) || | |
1210 | !dev->irq_enabled)); | |
1da177e4 | 1211 | |
30b23634 EA |
1212 | if (ret != -EINTR) { |
1213 | struct timeval now; | |
1da177e4 | 1214 | |
27641c3f | 1215 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1216 | vblwait->reply.tval_sec = now.tv_sec; |
1217 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1218 | |
30b23634 EA |
1219 | DRM_DEBUG("returning %d to client\n", |
1220 | vblwait->reply.sequence); | |
1da177e4 | 1221 | } else { |
30b23634 | 1222 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1223 | } |
1224 | ||
0a3e67a4 JB |
1225 | done: |
1226 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1227 | return ret; |
1228 | } | |
1229 | ||
c9a9c5e0 KH |
1230 | void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
1231 | { | |
1232 | struct drm_pending_vblank_event *e, *t; | |
1233 | struct timeval now; | |
1234 | unsigned long flags; | |
1235 | unsigned int seq; | |
1236 | ||
27641c3f | 1237 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1238 | |
1239 | spin_lock_irqsave(&dev->event_lock, flags); | |
1240 | ||
1241 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1242 | if (e->pipe != crtc) | |
1243 | continue; | |
1244 | if ((seq - e->event.sequence) > (1<<23)) | |
1245 | continue; | |
1246 | ||
1247 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1248 | e->event.sequence, seq); | |
1249 | ||
1250 | e->event.sequence = seq; | |
1251 | e->event.tv_sec = now.tv_sec; | |
1252 | e->event.tv_usec = now.tv_usec; | |
1253 | drm_vblank_put(dev, e->pipe); | |
1254 | list_move_tail(&e->base.link, &e->base.file_priv->event_list); | |
1255 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
b9c2c9ae JB |
1256 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, |
1257 | e->event.sequence); | |
c9a9c5e0 KH |
1258 | } |
1259 | ||
1260 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
ac2874b9 JB |
1261 | |
1262 | trace_drm_vblank_event(crtc, seq); | |
c9a9c5e0 KH |
1263 | } |
1264 | ||
0a3e67a4 JB |
1265 | /** |
1266 | * drm_handle_vblank - handle a vblank event | |
1267 | * @dev: DRM device | |
1268 | * @crtc: where this event occurred | |
1269 | * | |
1270 | * Drivers should call this routine in their vblank interrupt handlers to | |
1271 | * update the vblank counter and send any signals that may be pending. | |
1272 | */ | |
78c6e170 | 1273 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1274 | { |
27641c3f MK |
1275 | u32 vblcount; |
1276 | s64 diff_ns; | |
1277 | struct timeval tvblank; | |
1278 | unsigned long irqflags; | |
1279 | ||
c9a9c5e0 | 1280 | if (!dev->num_crtcs) |
78c6e170 | 1281 | return false; |
c9a9c5e0 | 1282 | |
27641c3f MK |
1283 | /* Need timestamp lock to prevent concurrent execution with |
1284 | * vblank enable/disable, as this would cause inconsistent | |
1285 | * or corrupted timestamps and vblank counts. | |
1286 | */ | |
1287 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
1288 | ||
1289 | /* Vblank irq handling disabled. Nothing to do. */ | |
1290 | if (!dev->vblank_enabled[crtc]) { | |
1291 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
78c6e170 | 1292 | return false; |
27641c3f MK |
1293 | } |
1294 | ||
1295 | /* Fetch corresponding timestamp for this vblank interval from | |
1296 | * driver and store it in proper slot of timestamp ringbuffer. | |
1297 | */ | |
1298 | ||
1299 | /* Get current timestamp and count. */ | |
1300 | vblcount = atomic_read(&dev->_vblank_count[crtc]); | |
1301 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); | |
1302 | ||
1303 | /* Compute time difference to timestamp of last vblank */ | |
1304 | diff_ns = timeval_to_ns(&tvblank) - | |
1305 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1306 | ||
1307 | /* Update vblank timestamp and count if at least | |
1308 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1309 | * difference between last stored timestamp and current | |
1310 | * timestamp. A smaller difference means basically | |
1311 | * identical timestamps. Happens if this vblank has | |
1312 | * been already processed and this is a redundant call, | |
1313 | * e.g., due to spurious vblank interrupts. We need to | |
1314 | * ignore those for accounting. | |
1315 | */ | |
c4cc3839 | 1316 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { |
27641c3f MK |
1317 | /* Store new timestamp in ringbuffer. */ |
1318 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
27641c3f MK |
1319 | |
1320 | /* Increment cooked vblank count. This also atomically commits | |
1321 | * the timestamp computed above. | |
1322 | */ | |
bc215128 | 1323 | smp_mb__before_atomic_inc(); |
27641c3f | 1324 | atomic_inc(&dev->_vblank_count[crtc]); |
bc215128 | 1325 | smp_mb__after_atomic_inc(); |
27641c3f MK |
1326 | } else { |
1327 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", | |
1328 | crtc, (int) diff_ns); | |
1329 | } | |
1330 | ||
0a3e67a4 | 1331 | DRM_WAKEUP(&dev->vbl_queue[crtc]); |
c9a9c5e0 | 1332 | drm_handle_vblank_events(dev, crtc); |
27641c3f MK |
1333 | |
1334 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
78c6e170 | 1335 | return true; |
0a3e67a4 JB |
1336 | } |
1337 | EXPORT_SYMBOL(drm_handle_vblank); |