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Commit | Line | Data |
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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. */ | |
46 | #define vblanktimestamp(dev, crtc, count) ( \ | |
47 | (dev)->_vblank_time[(crtc) * DRM_VBLANKTIME_RBSIZE + \ | |
48 | ((count) % DRM_VBLANKTIME_RBSIZE)]) | |
49 | ||
50 | /* Retry timestamp calculation up to 3 times to satisfy | |
51 | * drm_timestamp_precision before giving up. | |
52 | */ | |
53 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
54 | ||
55 | /* Threshold in nanoseconds for detection of redundant | |
56 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
57 | */ | |
58 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
59 | ||
1da177e4 LT |
60 | /** |
61 | * Get interrupt from bus id. | |
b5e89ed5 | 62 | * |
1da177e4 | 63 | * \param inode device inode. |
6c340eac | 64 | * \param file_priv DRM file private. |
1da177e4 LT |
65 | * \param cmd command. |
66 | * \param arg user argument, pointing to a drm_irq_busid structure. | |
67 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 68 | * |
1da177e4 LT |
69 | * Finds the PCI device with the specified bus id and gets its IRQ number. |
70 | * This IOCTL is deprecated, and will now return EINVAL for any busid not equal | |
71 | * to that of the device that this DRM instance attached to. | |
72 | */ | |
c153f45f EA |
73 | int drm_irq_by_busid(struct drm_device *dev, void *data, |
74 | struct drm_file *file_priv) | |
1da177e4 | 75 | { |
c153f45f | 76 | struct drm_irq_busid *p = data; |
1da177e4 | 77 | |
8410ea3b | 78 | if (!dev->driver->bus->irq_by_busid) |
dcdb1674 JC |
79 | return -EINVAL; |
80 | ||
1da177e4 LT |
81 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
82 | return -EINVAL; | |
83 | ||
8410ea3b | 84 | return dev->driver->bus->irq_by_busid(dev, p); |
1da177e4 LT |
85 | } |
86 | ||
27641c3f MK |
87 | /* |
88 | * Clear vblank timestamp buffer for a crtc. | |
89 | */ | |
90 | static void clear_vblank_timestamps(struct drm_device *dev, int crtc) | |
91 | { | |
92 | memset(&dev->_vblank_time[crtc * DRM_VBLANKTIME_RBSIZE], 0, | |
93 | DRM_VBLANKTIME_RBSIZE * sizeof(struct timeval)); | |
94 | } | |
95 | ||
96 | /* | |
97 | * Disable vblank irq's on crtc, make sure that last vblank count | |
98 | * of hardware and corresponding consistent software vblank counter | |
99 | * are preserved, even if there are any spurious vblank irq's after | |
100 | * disable. | |
101 | */ | |
102 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
103 | { | |
104 | unsigned long irqflags; | |
105 | u32 vblcount; | |
106 | s64 diff_ns; | |
107 | int vblrc; | |
108 | struct timeval tvblank; | |
109 | ||
110 | /* Prevent vblank irq processing while disabling vblank irqs, | |
111 | * so no updates of timestamps or count can happen after we've | |
112 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 113 | */ |
27641c3f MK |
114 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
115 | ||
116 | dev->driver->disable_vblank(dev, crtc); | |
117 | dev->vblank_enabled[crtc] = 0; | |
118 | ||
119 | /* No further vblank irq's will be processed after | |
120 | * this point. Get current hardware vblank count and | |
121 | * vblank timestamp, repeat until they are consistent. | |
122 | * | |
123 | * FIXME: There is still a race condition here and in | |
124 | * drm_update_vblank_count() which can cause off-by-one | |
125 | * reinitialization of software vblank counter. If gpu | |
126 | * vblank counter doesn't increment exactly at the leading | |
127 | * edge of a vblank interval, then we can lose 1 count if | |
128 | * we happen to execute between start of vblank and the | |
129 | * delayed gpu counter increment. | |
130 | */ | |
131 | do { | |
132 | dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc); | |
133 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); | |
134 | } while (dev->last_vblank[crtc] != dev->driver->get_vblank_counter(dev, crtc)); | |
135 | ||
136 | /* Compute time difference to stored timestamp of last vblank | |
137 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
138 | */ | |
139 | vblcount = atomic_read(&dev->_vblank_count[crtc]); | |
140 | diff_ns = timeval_to_ns(&tvblank) - | |
141 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
142 | ||
143 | /* If there is at least 1 msec difference between the last stored | |
144 | * timestamp and tvblank, then we are currently executing our | |
145 | * disable inside a new vblank interval, the tvblank timestamp | |
146 | * corresponds to this new vblank interval and the irq handler | |
147 | * for this vblank didn't run yet and won't run due to our disable. | |
148 | * Therefore we need to do the job of drm_handle_vblank() and | |
149 | * increment the vblank counter by one to account for this vblank. | |
150 | * | |
151 | * Skip this step if there isn't any high precision timestamp | |
152 | * available. In that case we can't account for this and just | |
153 | * hope for the best. | |
154 | */ | |
bc215128 | 155 | if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) { |
27641c3f | 156 | atomic_inc(&dev->_vblank_count[crtc]); |
bc215128 MK |
157 | smp_mb__after_atomic_inc(); |
158 | } | |
27641c3f MK |
159 | |
160 | /* Invalidate all timestamps while vblank irq's are off. */ | |
161 | clear_vblank_timestamps(dev, crtc); | |
162 | ||
163 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
27641c3f MK |
164 | } |
165 | ||
0a3e67a4 JB |
166 | static void vblank_disable_fn(unsigned long arg) |
167 | { | |
168 | struct drm_device *dev = (struct drm_device *)arg; | |
169 | unsigned long irqflags; | |
170 | int i; | |
171 | ||
172 | if (!dev->vblank_disable_allowed) | |
173 | return; | |
174 | ||
175 | for (i = 0; i < dev->num_crtcs; i++) { | |
176 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
177 | if (atomic_read(&dev->vblank_refcount[i]) == 0 && | |
178 | dev->vblank_enabled[i]) { | |
179 | DRM_DEBUG("disabling vblank on crtc %d\n", i); | |
27641c3f | 180 | vblank_disable_and_save(dev, i); |
0a3e67a4 JB |
181 | } |
182 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
183 | } | |
184 | } | |
185 | ||
52440211 | 186 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 JB |
187 | { |
188 | /* Bail if the driver didn't call drm_vblank_init() */ | |
189 | if (dev->num_crtcs == 0) | |
190 | return; | |
191 | ||
7eb3b2c8 | 192 | del_timer_sync(&dev->vblank_disable_timer); |
0a3e67a4 JB |
193 | |
194 | vblank_disable_fn((unsigned long)dev); | |
195 | ||
9a298b2a EA |
196 | kfree(dev->vbl_queue); |
197 | kfree(dev->_vblank_count); | |
198 | kfree(dev->vblank_refcount); | |
199 | kfree(dev->vblank_enabled); | |
200 | kfree(dev->last_vblank); | |
201 | kfree(dev->last_vblank_wait); | |
202 | kfree(dev->vblank_inmodeset); | |
27641c3f | 203 | kfree(dev->_vblank_time); |
0a3e67a4 JB |
204 | |
205 | dev->num_crtcs = 0; | |
206 | } | |
e77cef9c | 207 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 JB |
208 | |
209 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) | |
210 | { | |
211 | int i, ret = -ENOMEM; | |
212 | ||
213 | setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, | |
214 | (unsigned long)dev); | |
215 | spin_lock_init(&dev->vbl_lock); | |
27641c3f MK |
216 | spin_lock_init(&dev->vblank_time_lock); |
217 | ||
0a3e67a4 JB |
218 | dev->num_crtcs = num_crtcs; |
219 | ||
9a298b2a EA |
220 | dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs, |
221 | GFP_KERNEL); | |
0a3e67a4 JB |
222 | if (!dev->vbl_queue) |
223 | goto err; | |
224 | ||
9a298b2a | 225 | dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL); |
0a3e67a4 JB |
226 | if (!dev->_vblank_count) |
227 | goto err; | |
228 | ||
9a298b2a EA |
229 | dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs, |
230 | GFP_KERNEL); | |
0a3e67a4 JB |
231 | if (!dev->vblank_refcount) |
232 | goto err; | |
233 | ||
9a298b2a | 234 | dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
235 | if (!dev->vblank_enabled) |
236 | goto err; | |
237 | ||
9a298b2a | 238 | dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
0a3e67a4 JB |
239 | if (!dev->last_vblank) |
240 | goto err; | |
241 | ||
9a298b2a | 242 | dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
fede5c91 EA |
243 | if (!dev->last_vblank_wait) |
244 | goto err; | |
245 | ||
9a298b2a | 246 | dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
247 | if (!dev->vblank_inmodeset) |
248 | goto err; | |
249 | ||
27641c3f MK |
250 | dev->_vblank_time = kcalloc(num_crtcs * DRM_VBLANKTIME_RBSIZE, |
251 | sizeof(struct timeval), GFP_KERNEL); | |
252 | if (!dev->_vblank_time) | |
253 | goto err; | |
254 | ||
255 | DRM_INFO("Supports vblank timestamp caching Rev 1 (10.10.2010).\n"); | |
256 | ||
257 | /* Driver specific high-precision vblank timestamping supported? */ | |
258 | if (dev->driver->get_vblank_timestamp) | |
259 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
260 | else | |
261 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
262 | ||
0a3e67a4 JB |
263 | /* Zero per-crtc vblank stuff */ |
264 | for (i = 0; i < num_crtcs; i++) { | |
265 | init_waitqueue_head(&dev->vbl_queue[i]); | |
0a3e67a4 JB |
266 | atomic_set(&dev->_vblank_count[i], 0); |
267 | atomic_set(&dev->vblank_refcount[i], 0); | |
268 | } | |
269 | ||
270 | dev->vblank_disable_allowed = 0; | |
0a3e67a4 JB |
271 | return 0; |
272 | ||
273 | err: | |
274 | drm_vblank_cleanup(dev); | |
275 | return ret; | |
276 | } | |
277 | EXPORT_SYMBOL(drm_vblank_init); | |
278 | ||
28d52043 DA |
279 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
280 | { | |
281 | struct drm_device *dev = cookie; | |
282 | ||
283 | if (dev->driver->vgaarb_irq) { | |
284 | dev->driver->vgaarb_irq(dev, state); | |
285 | return; | |
286 | } | |
287 | ||
288 | if (!dev->irq_enabled) | |
289 | return; | |
290 | ||
5037f8ac JS |
291 | if (state) { |
292 | if (dev->driver->irq_uninstall) | |
293 | dev->driver->irq_uninstall(dev); | |
294 | } else { | |
295 | if (dev->driver->irq_preinstall) | |
296 | dev->driver->irq_preinstall(dev); | |
297 | if (dev->driver->irq_postinstall) | |
298 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
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 |
884a53ef | 308 | * \c irq_preinstall() and \c irq_postinstall() functions |
1da177e4 LT |
309 | * before and after the installation. |
310 | */ | |
0a3e67a4 | 311 | int drm_irq_install(struct drm_device *dev) |
1da177e4 | 312 | { |
4a1b0714 | 313 | int ret; |
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 */ |
5037f8ac JS |
341 | if (dev->driver->irq_preinstall) |
342 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 343 | |
b5e89ed5 | 344 | /* Install handler */ |
1da177e4 | 345 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 346 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 347 | |
b8da7de5 DA |
348 | if (dev->devname) |
349 | irqname = dev->devname; | |
350 | else | |
351 | irqname = dev->driver->name; | |
352 | ||
9bfbd5cb | 353 | ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, |
b8da7de5 | 354 | sh_flags, irqname, dev); |
9bfbd5cb | 355 | |
b5e89ed5 | 356 | if (ret < 0) { |
30e2fb18 | 357 | mutex_lock(&dev->struct_mutex); |
1da177e4 | 358 | dev->irq_enabled = 0; |
30e2fb18 | 359 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
360 | return ret; |
361 | } | |
362 | ||
28d52043 DA |
363 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
364 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
365 | ||
b5e89ed5 | 366 | /* After installing handler */ |
5037f8ac JS |
367 | if (dev->driver->irq_postinstall) |
368 | ret = dev->driver->irq_postinstall(dev); | |
369 | ||
0a3e67a4 JB |
370 | if (ret < 0) { |
371 | mutex_lock(&dev->struct_mutex); | |
372 | dev->irq_enabled = 0; | |
373 | mutex_unlock(&dev->struct_mutex); | |
e1c44acc JS |
374 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
375 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
376 | free_irq(drm_dev_to_irq(dev), dev); | |
0a3e67a4 | 377 | } |
1da177e4 | 378 | |
0a3e67a4 | 379 | return ret; |
1da177e4 | 380 | } |
0a3e67a4 | 381 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
382 | |
383 | /** | |
384 | * Uninstall the IRQ handler. | |
385 | * | |
386 | * \param dev DRM device. | |
387 | * | |
884a53ef | 388 | * Calls the driver's \c irq_uninstall() function, and stops the irq. |
1da177e4 | 389 | */ |
27641c3f | 390 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 391 | { |
dc1336ff JB |
392 | unsigned long irqflags; |
393 | int irq_enabled, i; | |
1da177e4 LT |
394 | |
395 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
396 | return -EINVAL; | |
397 | ||
30e2fb18 | 398 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
399 | irq_enabled = dev->irq_enabled; |
400 | dev->irq_enabled = 0; | |
30e2fb18 | 401 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 402 | |
dc1336ff JB |
403 | /* |
404 | * Wake up any waiters so they don't hang. | |
405 | */ | |
bde4889a BS |
406 | if (dev->num_crtcs) { |
407 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
408 | for (i = 0; i < dev->num_crtcs; i++) { | |
409 | DRM_WAKEUP(&dev->vbl_queue[i]); | |
410 | dev->vblank_enabled[i] = 0; | |
411 | dev->last_vblank[i] = | |
412 | dev->driver->get_vblank_counter(dev, i); | |
413 | } | |
414 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 415 | } |
dc1336ff | 416 | |
b5e89ed5 | 417 | if (!irq_enabled) |
1da177e4 LT |
418 | return -EINVAL; |
419 | ||
dcdb1674 | 420 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
1da177e4 | 421 | |
28d52043 DA |
422 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
423 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
424 | ||
5037f8ac JS |
425 | if (dev->driver->irq_uninstall) |
426 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 427 | |
dcdb1674 | 428 | free_irq(drm_dev_to_irq(dev), dev); |
1da177e4 LT |
429 | |
430 | return 0; | |
431 | } | |
432 | EXPORT_SYMBOL(drm_irq_uninstall); | |
433 | ||
434 | /** | |
435 | * IRQ control ioctl. | |
436 | * | |
437 | * \param inode device inode. | |
6c340eac | 438 | * \param file_priv DRM file private. |
1da177e4 LT |
439 | * \param cmd command. |
440 | * \param arg user argument, pointing to a drm_control structure. | |
441 | * \return zero on success or a negative number on failure. | |
442 | * | |
443 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
444 | */ | |
c153f45f EA |
445 | int drm_control(struct drm_device *dev, void *data, |
446 | struct drm_file *file_priv) | |
1da177e4 | 447 | { |
c153f45f | 448 | struct drm_control *ctl = data; |
b5e89ed5 | 449 | |
27641c3f MK |
450 | /* if we haven't irq we fallback for compatibility reasons - |
451 | * this used to be a separate function in drm_dma.h | |
452 | */ | |
1da177e4 | 453 | |
1da177e4 | 454 | |
c153f45f | 455 | switch (ctl->func) { |
1da177e4 LT |
456 | case DRM_INST_HANDLER: |
457 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
458 | return 0; | |
f453ba04 DA |
459 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
460 | return 0; | |
1da177e4 | 461 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
dcdb1674 | 462 | ctl->irq != drm_dev_to_irq(dev)) |
1da177e4 | 463 | return -EINVAL; |
b5e89ed5 | 464 | return drm_irq_install(dev); |
1da177e4 LT |
465 | case DRM_UNINST_HANDLER: |
466 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
467 | return 0; | |
f453ba04 DA |
468 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
469 | return 0; | |
b5e89ed5 | 470 | return drm_irq_uninstall(dev); |
1da177e4 LT |
471 | default: |
472 | return -EINVAL; | |
473 | } | |
474 | } | |
475 | ||
27641c3f MK |
476 | /** |
477 | * drm_calc_timestamping_constants - Calculate and | |
478 | * store various constants which are later needed by | |
479 | * vblank and swap-completion timestamping, e.g, by | |
480 | * drm_calc_vbltimestamp_from_scanoutpos(). | |
481 | * They are derived from crtc's true scanout timing, | |
482 | * so they take things like panel scaling or other | |
483 | * adjustments into account. | |
484 | * | |
485 | * @crtc drm_crtc whose timestamp constants should be updated. | |
486 | * | |
487 | */ | |
488 | void drm_calc_timestamping_constants(struct drm_crtc *crtc) | |
489 | { | |
490 | s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; | |
491 | u64 dotclock; | |
492 | ||
493 | /* Dot clock in Hz: */ | |
494 | dotclock = (u64) crtc->hwmode.clock * 1000; | |
495 | ||
9be6f8a9 MK |
496 | /* Fields of interlaced scanout modes are only halve a frame duration. |
497 | * Double the dotclock to get halve the frame-/line-/pixelduration. | |
498 | */ | |
499 | if (crtc->hwmode.flags & DRM_MODE_FLAG_INTERLACE) | |
500 | dotclock *= 2; | |
501 | ||
27641c3f MK |
502 | /* Valid dotclock? */ |
503 | if (dotclock > 0) { | |
504 | /* Convert scanline length in pixels and video dot clock to | |
505 | * line duration, frame duration and pixel duration in | |
506 | * nanoseconds: | |
507 | */ | |
508 | pixeldur_ns = (s64) div64_u64(1000000000, dotclock); | |
509 | linedur_ns = (s64) div64_u64(((u64) crtc->hwmode.crtc_htotal * | |
510 | 1000000000), dotclock); | |
511 | framedur_ns = (s64) crtc->hwmode.crtc_vtotal * linedur_ns; | |
512 | } else | |
513 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", | |
514 | crtc->base.id); | |
515 | ||
516 | crtc->pixeldur_ns = pixeldur_ns; | |
517 | crtc->linedur_ns = linedur_ns; | |
518 | crtc->framedur_ns = framedur_ns; | |
519 | ||
520 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
521 | crtc->base.id, crtc->hwmode.crtc_htotal, | |
522 | crtc->hwmode.crtc_vtotal, crtc->hwmode.crtc_vdisplay); | |
523 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", | |
524 | crtc->base.id, (int) dotclock/1000, (int) framedur_ns, | |
525 | (int) linedur_ns, (int) pixeldur_ns); | |
526 | } | |
527 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
528 | ||
529 | /** | |
530 | * drm_calc_vbltimestamp_from_scanoutpos - helper routine for kms | |
531 | * drivers. Implements calculation of exact vblank timestamps from | |
532 | * given drm_display_mode timings and current video scanout position | |
533 | * of a crtc. This can be called from within get_vblank_timestamp() | |
534 | * implementation of a kms driver to implement the actual timestamping. | |
535 | * | |
536 | * Should return timestamps conforming to the OML_sync_control OpenML | |
537 | * extension specification. The timestamp corresponds to the end of | |
538 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
539 | * pixel in the following video frame. | |
540 | * | |
541 | * Requires support for optional dev->driver->get_scanout_position() | |
542 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
543 | * that corresponds to the true scanout timing. | |
544 | * | |
545 | * The current implementation only handles standard video modes. It | |
546 | * returns as no operation if a doublescan or interlaced video mode is | |
547 | * active. Higher level code is expected to handle this. | |
548 | * | |
549 | * @dev: DRM device. | |
550 | * @crtc: Which crtc's vblank timestamp to retrieve. | |
551 | * @max_error: Desired maximum allowable error in timestamps (nanosecs). | |
552 | * On return contains true maximum error of timestamp. | |
553 | * @vblank_time: Pointer to struct timeval which should receive the timestamp. | |
554 | * @flags: Flags to pass to driver: | |
555 | * 0 = Default. | |
556 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. | |
557 | * @refcrtc: drm_crtc* of crtc which defines scanout timing. | |
558 | * | |
559 | * Returns negative value on error, failure or if not supported in current | |
560 | * video mode: | |
561 | * | |
562 | * -EINVAL - Invalid crtc. | |
563 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. | |
564 | * -ENOTSUPP - Function not supported in current display mode. | |
565 | * -EIO - Failed, e.g., due to failed scanout position query. | |
566 | * | |
567 | * Returns or'ed positive status flags on success: | |
568 | * | |
569 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
570 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
571 | * | |
572 | */ | |
573 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, | |
574 | int *max_error, | |
575 | struct timeval *vblank_time, | |
576 | unsigned flags, | |
577 | struct drm_crtc *refcrtc) | |
578 | { | |
e62f2f5a ID |
579 | ktime_t stime, etime, mono_time_offset; |
580 | struct timeval tv_etime; | |
27641c3f MK |
581 | struct drm_display_mode *mode; |
582 | int vbl_status, vtotal, vdisplay; | |
583 | int vpos, hpos, i; | |
584 | s64 framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; | |
585 | bool invbl; | |
586 | ||
587 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
588 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
589 | return -EINVAL; | |
590 | } | |
591 | ||
592 | /* Scanout position query not supported? Should not happen. */ | |
593 | if (!dev->driver->get_scanout_position) { | |
594 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
595 | return -EIO; | |
596 | } | |
597 | ||
598 | mode = &refcrtc->hwmode; | |
599 | vtotal = mode->crtc_vtotal; | |
600 | vdisplay = mode->crtc_vdisplay; | |
601 | ||
602 | /* Durations of frames, lines, pixels in nanoseconds. */ | |
603 | framedur_ns = refcrtc->framedur_ns; | |
604 | linedur_ns = refcrtc->linedur_ns; | |
605 | pixeldur_ns = refcrtc->pixeldur_ns; | |
606 | ||
607 | /* If mode timing undefined, just return as no-op: | |
608 | * Happens during initial modesetting of a crtc. | |
609 | */ | |
610 | if (vtotal <= 0 || vdisplay <= 0 || framedur_ns == 0) { | |
611 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); | |
612 | return -EAGAIN; | |
613 | } | |
614 | ||
27641c3f MK |
615 | /* Get current scanout position with system timestamp. |
616 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
617 | * if single query takes longer than max_error nanoseconds. | |
618 | * | |
619 | * This guarantees a tight bound on maximum error if | |
620 | * code gets preempted or delayed for some reason. | |
621 | */ | |
622 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
623 | /* Disable preemption to make it very likely to | |
624 | * succeed in the first iteration even on PREEMPT_RT kernel. | |
625 | */ | |
626 | preempt_disable(); | |
627 | ||
628 | /* Get system timestamp before query. */ | |
e62f2f5a | 629 | stime = ktime_get(); |
27641c3f MK |
630 | |
631 | /* Get vertical and horizontal scanout pos. vpos, hpos. */ | |
632 | vbl_status = dev->driver->get_scanout_position(dev, crtc, &vpos, &hpos); | |
633 | ||
634 | /* Get system timestamp after query. */ | |
e62f2f5a ID |
635 | etime = ktime_get(); |
636 | mono_time_offset = ktime_get_monotonic_offset(); | |
27641c3f MK |
637 | |
638 | preempt_enable(); | |
639 | ||
640 | /* Return as no-op if scanout query unsupported or failed. */ | |
641 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
642 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
643 | crtc, vbl_status); | |
644 | return -EIO; | |
645 | } | |
646 | ||
e62f2f5a | 647 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
648 | |
649 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
650 | if (duration_ns <= (s64) *max_error) | |
651 | break; | |
652 | } | |
653 | ||
654 | /* Noisy system timing? */ | |
655 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
656 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
657 | crtc, (int) duration_ns/1000, *max_error/1000, i); | |
658 | } | |
659 | ||
660 | /* Return upper bound of timestamp precision error. */ | |
661 | *max_error = (int) duration_ns; | |
662 | ||
663 | /* Check if in vblank area: | |
664 | * vpos is >=0 in video scanout area, but negative | |
665 | * within vblank area, counting down the number of lines until | |
666 | * start of scanout. | |
667 | */ | |
668 | invbl = vbl_status & DRM_SCANOUTPOS_INVBL; | |
669 | ||
670 | /* Convert scanout position into elapsed time at raw_time query | |
671 | * since start of scanout at first display scanline. delta_ns | |
672 | * can be negative if start of scanout hasn't happened yet. | |
673 | */ | |
674 | delta_ns = (s64) vpos * linedur_ns + (s64) hpos * pixeldur_ns; | |
675 | ||
676 | /* Is vpos outside nominal vblank area, but less than | |
677 | * 1/100 of a frame height away from start of vblank? | |
678 | * If so, assume this isn't a massively delayed vblank | |
679 | * interrupt, but a vblank interrupt that fired a few | |
680 | * microseconds before true start of vblank. Compensate | |
681 | * by adding a full frame duration to the final timestamp. | |
682 | * Happens, e.g., on ATI R500, R600. | |
683 | * | |
684 | * We only do this if DRM_CALLED_FROM_VBLIRQ. | |
685 | */ | |
686 | if ((flags & DRM_CALLED_FROM_VBLIRQ) && !invbl && | |
687 | ((vdisplay - vpos) < vtotal / 100)) { | |
688 | delta_ns = delta_ns - framedur_ns; | |
689 | ||
690 | /* Signal this correction as "applied". */ | |
691 | vbl_status |= 0x8; | |
692 | } | |
693 | ||
e62f2f5a ID |
694 | etime = ktime_sub(etime, mono_time_offset); |
695 | /* save this only for debugging purposes */ | |
696 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
697 | /* Subtract time delta from raw timestamp to get final |
698 | * vblank_time timestamp for end of vblank. | |
699 | */ | |
e62f2f5a ID |
700 | etime = ktime_sub_ns(etime, delta_ns); |
701 | *vblank_time = ktime_to_timeval(etime); | |
27641c3f | 702 | |
bbb0aef5 JP |
703 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
704 | crtc, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 705 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 JP |
706 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
707 | (int)duration_ns/1000, i); | |
27641c3f MK |
708 | |
709 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
710 | if (invbl) | |
711 | vbl_status |= DRM_VBLANKTIME_INVBL; | |
712 | ||
713 | return vbl_status; | |
714 | } | |
715 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
716 | ||
717 | /** | |
718 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
719 | * vblank interval. | |
720 | * | |
721 | * @dev: DRM device | |
722 | * @crtc: which crtc's vblank timestamp to retrieve | |
723 | * @tvblank: Pointer to target struct timeval which should receive the timestamp | |
724 | * @flags: Flags to pass to driver: | |
725 | * 0 = Default. | |
726 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. | |
727 | * | |
728 | * Fetches the system timestamp corresponding to the time of the most recent | |
729 | * vblank interval on specified crtc. May call into kms-driver to | |
730 | * compute the timestamp with a high-precision GPU specific method. | |
731 | * | |
732 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
733 | * call, i.e., it isn't very precisely locked to the true vblank. | |
734 | * | |
735 | * Returns non-zero if timestamp is considered to be very precise. | |
736 | */ | |
737 | u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
738 | struct timeval *tvblank, unsigned flags) | |
739 | { | |
4a1b0714 | 740 | int ret; |
27641c3f MK |
741 | |
742 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
743 | int max_error = (int) drm_timestamp_precision * 1000; | |
744 | ||
745 | /* Query driver if possible and precision timestamping enabled. */ | |
746 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
747 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
748 | tvblank, flags); | |
749 | if (ret > 0) | |
750 | return (u32) ret; | |
751 | } | |
752 | ||
753 | /* GPU high precision timestamp query unsupported or failed. | |
754 | * Return gettimeofday timestamp as best estimate. | |
755 | */ | |
756 | do_gettimeofday(tvblank); | |
757 | ||
758 | return 0; | |
759 | } | |
760 | EXPORT_SYMBOL(drm_get_last_vbltimestamp); | |
761 | ||
0a3e67a4 JB |
762 | /** |
763 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
764 | * @dev: DRM device | |
765 | * @crtc: which counter to retrieve | |
766 | * | |
767 | * Fetches the "cooked" vblank count value that represents the number of | |
768 | * vblank events since the system was booted, including lost events due to | |
769 | * modesetting activity. | |
770 | */ | |
771 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
772 | { | |
773 | return atomic_read(&dev->_vblank_count[crtc]); | |
774 | } | |
775 | EXPORT_SYMBOL(drm_vblank_count); | |
776 | ||
27641c3f MK |
777 | /** |
778 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
779 | * and the system timestamp corresponding to that vblank counter value. | |
780 | * | |
781 | * @dev: DRM device | |
782 | * @crtc: which counter to retrieve | |
783 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
784 | * | |
785 | * Fetches the "cooked" vblank count value that represents the number of | |
786 | * vblank events since the system was booted, including lost events due to | |
787 | * modesetting activity. Returns corresponding system timestamp of the time | |
788 | * of the vblank interval that corresponds to the current value vblank counter | |
789 | * value. | |
790 | */ | |
791 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
792 | struct timeval *vblanktime) | |
793 | { | |
794 | u32 cur_vblank; | |
795 | ||
796 | /* Read timestamp from slot of _vblank_time ringbuffer | |
797 | * that corresponds to current vblank count. Retry if | |
798 | * count has incremented during readout. This works like | |
799 | * a seqlock. | |
800 | */ | |
801 | do { | |
802 | cur_vblank = atomic_read(&dev->_vblank_count[crtc]); | |
803 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); | |
804 | smp_rmb(); | |
805 | } while (cur_vblank != atomic_read(&dev->_vblank_count[crtc])); | |
806 | ||
807 | return cur_vblank; | |
808 | } | |
809 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
810 | ||
c6eefa17 RC |
811 | static void send_vblank_event(struct drm_device *dev, |
812 | struct drm_pending_vblank_event *e, | |
813 | unsigned long seq, struct timeval *now) | |
814 | { | |
815 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
816 | e->event.sequence = seq; | |
817 | e->event.tv_sec = now->tv_sec; | |
818 | e->event.tv_usec = now->tv_usec; | |
819 | ||
820 | list_add_tail(&e->base.link, | |
821 | &e->base.file_priv->event_list); | |
822 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
823 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
824 | e->event.sequence); | |
825 | } | |
826 | ||
827 | /** | |
828 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
829 | * @dev: DRM device | |
830 | * @crtc: CRTC in question | |
831 | * @e: the event to send | |
832 | * | |
833 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
834 | * Caller must hold event lock. | |
835 | */ | |
836 | void drm_send_vblank_event(struct drm_device *dev, int crtc, | |
837 | struct drm_pending_vblank_event *e) | |
838 | { | |
839 | struct timeval now; | |
840 | unsigned int seq; | |
841 | if (crtc >= 0) { | |
842 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
843 | } else { | |
844 | seq = 0; | |
845 | do_gettimeofday(&now); | |
846 | } | |
847 | send_vblank_event(dev, e, seq, &now); | |
848 | } | |
849 | EXPORT_SYMBOL(drm_send_vblank_event); | |
850 | ||
0a3e67a4 JB |
851 | /** |
852 | * drm_update_vblank_count - update the master vblank counter | |
853 | * @dev: DRM device | |
854 | * @crtc: counter to update | |
855 | * | |
856 | * Call back into the driver to update the appropriate vblank counter | |
857 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
858 | * update the last read value so we can deal with wraparound on the next | |
859 | * call if necessary. | |
860 | * | |
861 | * Only necessary when going from off->on, to account for frames we | |
862 | * didn't get an interrupt for. | |
863 | * | |
864 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
865 | * device vblank fields. | |
866 | */ | |
867 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
868 | { | |
27641c3f MK |
869 | u32 cur_vblank, diff, tslot, rc; |
870 | struct timeval t_vblank; | |
0a3e67a4 JB |
871 | |
872 | /* | |
873 | * Interrupts were disabled prior to this call, so deal with counter | |
874 | * wrap if needed. | |
875 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
876 | * here if the register is small or we had vblank interrupts off for | |
877 | * a long time. | |
27641c3f MK |
878 | * |
879 | * We repeat the hardware vblank counter & timestamp query until | |
880 | * we get consistent results. This to prevent races between gpu | |
881 | * updating its hardware counter while we are retrieving the | |
882 | * corresponding vblank timestamp. | |
0a3e67a4 | 883 | */ |
27641c3f MK |
884 | do { |
885 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
886 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
887 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
888 | ||
889 | /* Deal with counter wrap */ | |
0a3e67a4 JB |
890 | diff = cur_vblank - dev->last_vblank[crtc]; |
891 | if (cur_vblank < dev->last_vblank[crtc]) { | |
892 | diff += dev->max_vblank_count; | |
893 | ||
894 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
895 | crtc, dev->last_vblank[crtc], cur_vblank, diff); | |
896 | } | |
897 | ||
898 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", | |
899 | crtc, diff); | |
900 | ||
27641c3f MK |
901 | /* Reinitialize corresponding vblank timestamp if high-precision query |
902 | * available. Skip this step if query unsupported or failed. Will | |
903 | * reinitialize delayed at next vblank interrupt in that case. | |
904 | */ | |
905 | if (rc) { | |
906 | tslot = atomic_read(&dev->_vblank_count[crtc]) + diff; | |
907 | vblanktimestamp(dev, crtc, tslot) = t_vblank; | |
27641c3f MK |
908 | } |
909 | ||
bc215128 | 910 | smp_mb__before_atomic_inc(); |
0a3e67a4 | 911 | atomic_add(diff, &dev->_vblank_count[crtc]); |
bc215128 | 912 | smp_mb__after_atomic_inc(); |
0a3e67a4 JB |
913 | } |
914 | ||
915 | /** | |
916 | * drm_vblank_get - get a reference count on vblank events | |
917 | * @dev: DRM device | |
918 | * @crtc: which CRTC to own | |
919 | * | |
920 | * Acquire a reference count on vblank events to avoid having them disabled | |
921 | * while in use. | |
922 | * | |
923 | * RETURNS | |
924 | * Zero on success, nonzero on failure. | |
925 | */ | |
926 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
927 | { | |
27641c3f | 928 | unsigned long irqflags, irqflags2; |
0a3e67a4 JB |
929 | int ret = 0; |
930 | ||
931 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
932 | /* Going from 0->1 means we have to enable interrupts again */ | |
778c9026 | 933 | if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) { |
27641c3f | 934 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags2); |
778c9026 | 935 | if (!dev->vblank_enabled[crtc]) { |
27641c3f MK |
936 | /* Enable vblank irqs under vblank_time_lock protection. |
937 | * All vblank count & timestamp updates are held off | |
938 | * until we are done reinitializing master counter and | |
939 | * timestamps. Filtercode in drm_handle_vblank() will | |
940 | * prevent double-accounting of same vblank interval. | |
941 | */ | |
778c9026 | 942 | ret = dev->driver->enable_vblank(dev, crtc); |
27641c3f MK |
943 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", |
944 | crtc, ret); | |
778c9026 LP |
945 | if (ret) |
946 | atomic_dec(&dev->vblank_refcount[crtc]); | |
947 | else { | |
948 | dev->vblank_enabled[crtc] = 1; | |
949 | drm_update_vblank_count(dev, crtc); | |
950 | } | |
951 | } | |
27641c3f | 952 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2); |
778c9026 LP |
953 | } else { |
954 | if (!dev->vblank_enabled[crtc]) { | |
0a3e67a4 | 955 | atomic_dec(&dev->vblank_refcount[crtc]); |
778c9026 | 956 | ret = -EINVAL; |
0a3e67a4 JB |
957 | } |
958 | } | |
959 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
960 | ||
961 | return ret; | |
962 | } | |
963 | EXPORT_SYMBOL(drm_vblank_get); | |
964 | ||
965 | /** | |
966 | * drm_vblank_put - give up ownership of vblank events | |
967 | * @dev: DRM device | |
968 | * @crtc: which counter to give up | |
969 | * | |
970 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 971 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
0a3e67a4 JB |
972 | */ |
973 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
974 | { | |
27641c3f | 975 | BUG_ON(atomic_read(&dev->vblank_refcount[crtc]) == 0); |
b3f5e732 | 976 | |
0a3e67a4 | 977 | /* Last user schedules interrupt disable */ |
27641c3f MK |
978 | if (atomic_dec_and_test(&dev->vblank_refcount[crtc]) && |
979 | (drm_vblank_offdelay > 0)) | |
980 | mod_timer(&dev->vblank_disable_timer, | |
981 | jiffies + ((drm_vblank_offdelay * DRM_HZ)/1000)); | |
0a3e67a4 JB |
982 | } |
983 | EXPORT_SYMBOL(drm_vblank_put); | |
984 | ||
c6eefa17 RC |
985 | /** |
986 | * drm_vblank_off - disable vblank events on a CRTC | |
987 | * @dev: DRM device | |
988 | * @crtc: CRTC in question | |
989 | * | |
990 | * Caller must hold event lock. | |
991 | */ | |
778c9026 LP |
992 | void drm_vblank_off(struct drm_device *dev, int crtc) |
993 | { | |
498548ec CJHR |
994 | struct drm_pending_vblank_event *e, *t; |
995 | struct timeval now; | |
778c9026 | 996 | unsigned long irqflags; |
498548ec | 997 | unsigned int seq; |
778c9026 LP |
998 | |
999 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
27641c3f | 1000 | vblank_disable_and_save(dev, crtc); |
778c9026 | 1001 | DRM_WAKEUP(&dev->vbl_queue[crtc]); |
498548ec CJHR |
1002 | |
1003 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
1004 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
1005 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1006 | if (e->pipe != crtc) | |
1007 | continue; | |
1008 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
1009 | wanted %d, current %d\n", | |
1010 | e->event.sequence, seq); | |
c6eefa17 | 1011 | list_del(&e->base.link); |
498548ec | 1012 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1013 | send_vblank_event(dev, e, seq, &now); |
498548ec CJHR |
1014 | } |
1015 | ||
778c9026 LP |
1016 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1017 | } | |
1018 | EXPORT_SYMBOL(drm_vblank_off); | |
1019 | ||
f453ba04 DA |
1020 | /** |
1021 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1022 | * @dev: DRM device | |
1023 | * @crtc: CRTC in question | |
f453ba04 DA |
1024 | * |
1025 | * Account for vblank events across mode setting events, which will likely | |
1026 | * reset the hardware frame counter. | |
1027 | */ | |
1028 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
1029 | { | |
e77cef9c JG |
1030 | /* vblank is not initialized (IRQ not installed ?) */ |
1031 | if (!dev->num_crtcs) | |
1032 | return; | |
f453ba04 DA |
1033 | /* |
1034 | * To avoid all the problems that might happen if interrupts | |
1035 | * were enabled/disabled around or between these calls, we just | |
1036 | * have the kernel take a reference on the CRTC (just once though | |
1037 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1038 | * so that interrupts remain enabled in the interim. | |
1039 | */ | |
1040 | if (!dev->vblank_inmodeset[crtc]) { | |
b3f5e732 CW |
1041 | dev->vblank_inmodeset[crtc] = 0x1; |
1042 | if (drm_vblank_get(dev, crtc) == 0) | |
1043 | dev->vblank_inmodeset[crtc] |= 0x2; | |
f453ba04 DA |
1044 | } |
1045 | } | |
1046 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1047 | ||
1048 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) | |
1049 | { | |
1050 | unsigned long irqflags; | |
1051 | ||
1052 | if (dev->vblank_inmodeset[crtc]) { | |
1053 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1054 | dev->vblank_disable_allowed = 1; | |
f453ba04 | 1055 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 CW |
1056 | |
1057 | if (dev->vblank_inmodeset[crtc] & 0x2) | |
1058 | drm_vblank_put(dev, crtc); | |
1059 | ||
1060 | dev->vblank_inmodeset[crtc] = 0; | |
f453ba04 DA |
1061 | } |
1062 | } | |
1063 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1064 | ||
0a3e67a4 JB |
1065 | /** |
1066 | * drm_modeset_ctl - handle vblank event counter changes across mode switch | |
1067 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1068 | * | |
1069 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1070 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1071 | * | |
1072 | * Generally the counter will reset across mode sets. If interrupts are | |
1073 | * enabled around this call, we don't have to do anything since the counter | |
1074 | * will have already been incremented. | |
1075 | */ | |
1076 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1077 | struct drm_file *file_priv) | |
1078 | { | |
1079 | struct drm_modeset_ctl *modeset = data; | |
19227561 | 1080 | unsigned int crtc; |
0a3e67a4 JB |
1081 | |
1082 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1083 | if (!dev->num_crtcs) | |
4a1b0714 | 1084 | return 0; |
0a3e67a4 | 1085 | |
29935554 LP |
1086 | /* KMS drivers handle this internally */ |
1087 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1088 | return 0; | |
1089 | ||
0a3e67a4 | 1090 | crtc = modeset->crtc; |
4a1b0714 LP |
1091 | if (crtc >= dev->num_crtcs) |
1092 | return -EINVAL; | |
0a3e67a4 | 1093 | |
0a3e67a4 JB |
1094 | switch (modeset->cmd) { |
1095 | case _DRM_PRE_MODESET: | |
f453ba04 | 1096 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1097 | break; |
1098 | case _DRM_POST_MODESET: | |
f453ba04 | 1099 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1100 | break; |
1101 | default: | |
4a1b0714 | 1102 | return -EINVAL; |
0a3e67a4 JB |
1103 | } |
1104 | ||
4a1b0714 | 1105 | return 0; |
0a3e67a4 JB |
1106 | } |
1107 | ||
c9a9c5e0 KH |
1108 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1109 | union drm_wait_vblank *vblwait, | |
1110 | struct drm_file *file_priv) | |
1111 | { | |
1112 | struct drm_pending_vblank_event *e; | |
1113 | struct timeval now; | |
1114 | unsigned long flags; | |
1115 | unsigned int seq; | |
ea5d552c | 1116 | int ret; |
c9a9c5e0 KH |
1117 | |
1118 | e = kzalloc(sizeof *e, GFP_KERNEL); | |
ea5d552c CW |
1119 | if (e == NULL) { |
1120 | ret = -ENOMEM; | |
1121 | goto err_put; | |
1122 | } | |
c9a9c5e0 KH |
1123 | |
1124 | e->pipe = pipe; | |
b9c2c9ae | 1125 | e->base.pid = current->pid; |
c9a9c5e0 KH |
1126 | e->event.base.type = DRM_EVENT_VBLANK; |
1127 | e->event.base.length = sizeof e->event; | |
1128 | e->event.user_data = vblwait->request.signal; | |
1129 | e->base.event = &e->event.base; | |
1130 | e->base.file_priv = file_priv; | |
1131 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1132 | ||
c9a9c5e0 KH |
1133 | spin_lock_irqsave(&dev->event_lock, flags); |
1134 | ||
1135 | if (file_priv->event_space < sizeof e->event) { | |
ea5d552c CW |
1136 | ret = -EBUSY; |
1137 | goto err_unlock; | |
c9a9c5e0 KH |
1138 | } |
1139 | ||
1140 | file_priv->event_space -= sizeof e->event; | |
27641c3f MK |
1141 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1142 | ||
c9a9c5e0 KH |
1143 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1144 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1145 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1146 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1147 | } |
1148 | ||
1149 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1150 | vblwait->request.sequence, seq, pipe); | |
1151 | ||
b9c2c9ae JB |
1152 | trace_drm_vblank_event_queued(current->pid, pipe, |
1153 | vblwait->request.sequence); | |
1154 | ||
c9a9c5e0 KH |
1155 | e->event.sequence = vblwait->request.sequence; |
1156 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1157 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1158 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1159 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1160 | } else { |
a6778e9e | 1161 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1162 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1163 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1164 | } |
1165 | ||
1166 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1167 | ||
1168 | return 0; | |
ea5d552c CW |
1169 | |
1170 | err_unlock: | |
1171 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1172 | kfree(e); | |
1173 | err_put: | |
6f331623 | 1174 | drm_vblank_put(dev, pipe); |
ea5d552c | 1175 | return ret; |
c9a9c5e0 KH |
1176 | } |
1177 | ||
1da177e4 LT |
1178 | /** |
1179 | * Wait for VBLANK. | |
1180 | * | |
1181 | * \param inode device inode. | |
6c340eac | 1182 | * \param file_priv DRM file private. |
1da177e4 LT |
1183 | * \param cmd command. |
1184 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1185 | * \return zero on success or a negative number on failure. | |
1186 | * | |
30b23634 EA |
1187 | * This function enables the vblank interrupt on the pipe requested, then |
1188 | * sleeps waiting for the requested sequence number to occur, and drops | |
1189 | * the vblank interrupt refcount afterwards. (vblank irq disable follows that | |
1190 | * after a timeout with no further vblank waits scheduled). | |
1da177e4 | 1191 | */ |
0a3e67a4 JB |
1192 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1193 | struct drm_file *file_priv) | |
1da177e4 | 1194 | { |
c153f45f | 1195 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1196 | int ret; |
19b01b5f | 1197 | unsigned int flags, seq, crtc, high_crtc; |
1da177e4 | 1198 | |
dcdb1674 | 1199 | if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled)) |
1da177e4 LT |
1200 | return -EINVAL; |
1201 | ||
30b23634 EA |
1202 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1203 | return -EINVAL; | |
1204 | ||
c153f45f | 1205 | if (vblwait->request.type & |
19b01b5f IH |
1206 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1207 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1208 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1209 | vblwait->request.type, |
19b01b5f IH |
1210 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1211 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MD |
1212 | return -EINVAL; |
1213 | } | |
1214 | ||
c153f45f | 1215 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
19b01b5f IH |
1216 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1217 | if (high_crtc) | |
1218 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1219 | else | |
1220 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
0a3e67a4 | 1221 | if (crtc >= dev->num_crtcs) |
776c9443 MD |
1222 | return -EINVAL; |
1223 | ||
0a3e67a4 JB |
1224 | ret = drm_vblank_get(dev, crtc); |
1225 | if (ret) { | |
8d3457ec | 1226 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1227 | return ret; |
1228 | } | |
1229 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1230 | |
c153f45f | 1231 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1232 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1233 | vblwait->request.sequence += seq; |
1234 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1235 | case _DRM_VBLANK_ABSOLUTE: |
1236 | break; | |
1237 | default: | |
0a3e67a4 JB |
1238 | ret = -EINVAL; |
1239 | goto done; | |
1da177e4 LT |
1240 | } |
1241 | ||
a6778e9e IH |
1242 | if (flags & _DRM_VBLANK_EVENT) { |
1243 | /* must hold on to the vblank ref until the event fires | |
1244 | * drm_vblank_put will be called asynchronously | |
1245 | */ | |
c9a9c5e0 | 1246 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); |
a6778e9e | 1247 | } |
c9a9c5e0 | 1248 | |
ab285d74 | 1249 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1250 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1251 | vblwait->request.sequence = seq + 1; | |
ab285d74 MD |
1252 | } |
1253 | ||
30b23634 EA |
1254 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1255 | vblwait->request.sequence, crtc); | |
1256 | dev->last_vblank_wait[crtc] = vblwait->request.sequence; | |
1257 | DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ, | |
1258 | (((drm_vblank_count(dev, crtc) - | |
1259 | vblwait->request.sequence) <= (1 << 23)) || | |
1260 | !dev->irq_enabled)); | |
1da177e4 | 1261 | |
30b23634 EA |
1262 | if (ret != -EINTR) { |
1263 | struct timeval now; | |
1da177e4 | 1264 | |
27641c3f | 1265 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1266 | vblwait->reply.tval_sec = now.tv_sec; |
1267 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1268 | |
30b23634 EA |
1269 | DRM_DEBUG("returning %d to client\n", |
1270 | vblwait->reply.sequence); | |
1da177e4 | 1271 | } else { |
30b23634 | 1272 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1273 | } |
1274 | ||
0a3e67a4 JB |
1275 | done: |
1276 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1277 | return ret; |
1278 | } | |
1279 | ||
ea7f7abc | 1280 | static void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
c9a9c5e0 KH |
1281 | { |
1282 | struct drm_pending_vblank_event *e, *t; | |
1283 | struct timeval now; | |
1284 | unsigned long flags; | |
1285 | unsigned int seq; | |
1286 | ||
27641c3f | 1287 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1288 | |
1289 | spin_lock_irqsave(&dev->event_lock, flags); | |
1290 | ||
1291 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1292 | if (e->pipe != crtc) | |
1293 | continue; | |
1294 | if ((seq - e->event.sequence) > (1<<23)) | |
1295 | continue; | |
1296 | ||
1297 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1298 | e->event.sequence, seq); | |
1299 | ||
c6eefa17 | 1300 | list_del(&e->base.link); |
c9a9c5e0 | 1301 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1302 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1303 | } |
1304 | ||
1305 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
ac2874b9 JB |
1306 | |
1307 | trace_drm_vblank_event(crtc, seq); | |
c9a9c5e0 KH |
1308 | } |
1309 | ||
0a3e67a4 JB |
1310 | /** |
1311 | * drm_handle_vblank - handle a vblank event | |
1312 | * @dev: DRM device | |
1313 | * @crtc: where this event occurred | |
1314 | * | |
1315 | * Drivers should call this routine in their vblank interrupt handlers to | |
1316 | * update the vblank counter and send any signals that may be pending. | |
1317 | */ | |
78c6e170 | 1318 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1319 | { |
27641c3f MK |
1320 | u32 vblcount; |
1321 | s64 diff_ns; | |
1322 | struct timeval tvblank; | |
1323 | unsigned long irqflags; | |
1324 | ||
c9a9c5e0 | 1325 | if (!dev->num_crtcs) |
78c6e170 | 1326 | return false; |
c9a9c5e0 | 1327 | |
27641c3f MK |
1328 | /* Need timestamp lock to prevent concurrent execution with |
1329 | * vblank enable/disable, as this would cause inconsistent | |
1330 | * or corrupted timestamps and vblank counts. | |
1331 | */ | |
1332 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
1333 | ||
1334 | /* Vblank irq handling disabled. Nothing to do. */ | |
1335 | if (!dev->vblank_enabled[crtc]) { | |
1336 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
78c6e170 | 1337 | return false; |
27641c3f MK |
1338 | } |
1339 | ||
1340 | /* Fetch corresponding timestamp for this vblank interval from | |
1341 | * driver and store it in proper slot of timestamp ringbuffer. | |
1342 | */ | |
1343 | ||
1344 | /* Get current timestamp and count. */ | |
1345 | vblcount = atomic_read(&dev->_vblank_count[crtc]); | |
1346 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); | |
1347 | ||
1348 | /* Compute time difference to timestamp of last vblank */ | |
1349 | diff_ns = timeval_to_ns(&tvblank) - | |
1350 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1351 | ||
1352 | /* Update vblank timestamp and count if at least | |
1353 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1354 | * difference between last stored timestamp and current | |
1355 | * timestamp. A smaller difference means basically | |
1356 | * identical timestamps. Happens if this vblank has | |
1357 | * been already processed and this is a redundant call, | |
1358 | * e.g., due to spurious vblank interrupts. We need to | |
1359 | * ignore those for accounting. | |
1360 | */ | |
c4cc3839 | 1361 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { |
27641c3f MK |
1362 | /* Store new timestamp in ringbuffer. */ |
1363 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
27641c3f MK |
1364 | |
1365 | /* Increment cooked vblank count. This also atomically commits | |
1366 | * the timestamp computed above. | |
1367 | */ | |
bc215128 | 1368 | smp_mb__before_atomic_inc(); |
27641c3f | 1369 | atomic_inc(&dev->_vblank_count[crtc]); |
bc215128 | 1370 | smp_mb__after_atomic_inc(); |
27641c3f MK |
1371 | } else { |
1372 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", | |
1373 | crtc, (int) diff_ns); | |
1374 | } | |
1375 | ||
0a3e67a4 | 1376 | DRM_WAKEUP(&dev->vbl_queue[crtc]); |
c9a9c5e0 | 1377 | drm_handle_vblank_events(dev, crtc); |
27641c3f MK |
1378 | |
1379 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
78c6e170 | 1380 | return true; |
0a3e67a4 JB |
1381 | } |
1382 | EXPORT_SYMBOL(drm_handle_vblank); |