Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_irq.c |
1da177e4 LT |
3 | * IRQ support |
4 | * | |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
6 | * \author Gareth Hughes <gareth@valinux.com> | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com | |
11 | * | |
12 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
14 | * All Rights Reserved. | |
15 | * | |
16 | * Permission is hereby granted, free of charge, to any person obtaining a | |
17 | * copy of this software and associated documentation files (the "Software"), | |
18 | * to deal in the Software without restriction, including without limitation | |
19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
20 | * and/or sell copies of the Software, and to permit persons to whom the | |
21 | * Software is furnished to do so, subject to the following conditions: | |
22 | * | |
23 | * The above copyright notice and this permission notice (including the next | |
24 | * paragraph) shall be included in all copies or substantial portions of the | |
25 | * Software. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
28 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
29 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
30 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
31 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
32 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
33 | * OTHER DEALINGS IN THE SOFTWARE. | |
34 | */ | |
35 | ||
760285e7 | 36 | #include <drm/drmP.h> |
ac2874b9 | 37 | #include "drm_trace.h" |
1da177e4 LT |
38 | |
39 | #include <linux/interrupt.h> /* For task queue support */ | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 | 41 | |
28d52043 | 42 | #include <linux/vgaarb.h> |
2d1a8a48 | 43 | #include <linux/export.h> |
27641c3f MK |
44 | |
45 | /* Access macro for slots in vblank timestamp ringbuffer. */ | |
5380e929 VS |
46 | #define vblanktimestamp(dev, crtc, count) \ |
47 | ((dev)->vblank[crtc].time[(count) % DRM_VBLANKTIME_RBSIZE]) | |
27641c3f MK |
48 | |
49 | /* Retry timestamp calculation up to 3 times to satisfy | |
50 | * drm_timestamp_precision before giving up. | |
51 | */ | |
52 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
53 | ||
54 | /* Threshold in nanoseconds for detection of redundant | |
55 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
56 | */ | |
57 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
58 | ||
1da177e4 LT |
59 | /** |
60 | * Get interrupt from bus id. | |
b5e89ed5 | 61 | * |
1da177e4 | 62 | * \param inode device inode. |
6c340eac | 63 | * \param file_priv DRM file private. |
1da177e4 LT |
64 | * \param cmd command. |
65 | * \param arg user argument, pointing to a drm_irq_busid structure. | |
66 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 67 | * |
1da177e4 LT |
68 | * Finds the PCI device with the specified bus id and gets its IRQ number. |
69 | * This IOCTL is deprecated, and will now return EINVAL for any busid not equal | |
70 | * to that of the device that this DRM instance attached to. | |
71 | */ | |
c153f45f EA |
72 | int drm_irq_by_busid(struct drm_device *dev, void *data, |
73 | struct drm_file *file_priv) | |
1da177e4 | 74 | { |
c153f45f | 75 | struct drm_irq_busid *p = data; |
1da177e4 | 76 | |
8410ea3b | 77 | if (!dev->driver->bus->irq_by_busid) |
dcdb1674 JC |
78 | return -EINVAL; |
79 | ||
1da177e4 LT |
80 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
81 | return -EINVAL; | |
82 | ||
8410ea3b | 83 | return dev->driver->bus->irq_by_busid(dev, p); |
1da177e4 LT |
84 | } |
85 | ||
27641c3f MK |
86 | /* |
87 | * Clear vblank timestamp buffer for a crtc. | |
88 | */ | |
89 | static void clear_vblank_timestamps(struct drm_device *dev, int crtc) | |
90 | { | |
5380e929 | 91 | memset(dev->vblank[crtc].time, 0, sizeof(dev->vblank[crtc].time)); |
27641c3f MK |
92 | } |
93 | ||
94 | /* | |
95 | * Disable vblank irq's on crtc, make sure that last vblank count | |
96 | * of hardware and corresponding consistent software vblank counter | |
97 | * are preserved, even if there are any spurious vblank irq's after | |
98 | * disable. | |
99 | */ | |
100 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
101 | { | |
102 | unsigned long irqflags; | |
103 | u32 vblcount; | |
104 | s64 diff_ns; | |
105 | int vblrc; | |
106 | struct timeval tvblank; | |
0355cf3a | 107 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
108 | |
109 | /* Prevent vblank irq processing while disabling vblank irqs, | |
110 | * so no updates of timestamps or count can happen after we've | |
111 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 112 | */ |
27641c3f MK |
113 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
114 | ||
115 | dev->driver->disable_vblank(dev, crtc); | |
5380e929 | 116 | dev->vblank[crtc].enabled = false; |
27641c3f MK |
117 | |
118 | /* No further vblank irq's will be processed after | |
119 | * this point. Get current hardware vblank count and | |
120 | * vblank timestamp, repeat until they are consistent. | |
121 | * | |
122 | * FIXME: There is still a race condition here and in | |
123 | * drm_update_vblank_count() which can cause off-by-one | |
124 | * reinitialization of software vblank counter. If gpu | |
125 | * vblank counter doesn't increment exactly at the leading | |
126 | * edge of a vblank interval, then we can lose 1 count if | |
127 | * we happen to execute between start of vblank and the | |
128 | * delayed gpu counter increment. | |
129 | */ | |
130 | do { | |
5380e929 | 131 | dev->vblank[crtc].last = dev->driver->get_vblank_counter(dev, crtc); |
27641c3f | 132 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); |
5380e929 | 133 | } while (dev->vblank[crtc].last != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc); |
0355cf3a EE |
134 | |
135 | if (!count) | |
136 | vblrc = 0; | |
27641c3f MK |
137 | |
138 | /* Compute time difference to stored timestamp of last vblank | |
139 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
140 | */ | |
5380e929 | 141 | vblcount = atomic_read(&dev->vblank[crtc].count); |
27641c3f MK |
142 | diff_ns = timeval_to_ns(&tvblank) - |
143 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
144 | ||
145 | /* If there is at least 1 msec difference between the last stored | |
146 | * timestamp and tvblank, then we are currently executing our | |
147 | * disable inside a new vblank interval, the tvblank timestamp | |
148 | * corresponds to this new vblank interval and the irq handler | |
149 | * for this vblank didn't run yet and won't run due to our disable. | |
150 | * Therefore we need to do the job of drm_handle_vblank() and | |
151 | * increment the vblank counter by one to account for this vblank. | |
152 | * | |
153 | * Skip this step if there isn't any high precision timestamp | |
154 | * available. In that case we can't account for this and just | |
155 | * hope for the best. | |
156 | */ | |
bc215128 | 157 | if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) { |
5380e929 | 158 | atomic_inc(&dev->vblank[crtc].count); |
bc215128 MK |
159 | smp_mb__after_atomic_inc(); |
160 | } | |
27641c3f MK |
161 | |
162 | /* Invalidate all timestamps while vblank irq's are off. */ | |
163 | clear_vblank_timestamps(dev, crtc); | |
164 | ||
165 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
27641c3f MK |
166 | } |
167 | ||
0a3e67a4 JB |
168 | static void vblank_disable_fn(unsigned long arg) |
169 | { | |
170 | struct drm_device *dev = (struct drm_device *)arg; | |
171 | unsigned long irqflags; | |
172 | int i; | |
173 | ||
174 | if (!dev->vblank_disable_allowed) | |
175 | return; | |
176 | ||
177 | for (i = 0; i < dev->num_crtcs; i++) { | |
178 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
5380e929 VS |
179 | if (atomic_read(&dev->vblank[i].refcount) == 0 && |
180 | dev->vblank[i].enabled) { | |
0a3e67a4 | 181 | DRM_DEBUG("disabling vblank on crtc %d\n", i); |
27641c3f | 182 | vblank_disable_and_save(dev, i); |
0a3e67a4 JB |
183 | } |
184 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
185 | } | |
186 | } | |
187 | ||
52440211 | 188 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 JB |
189 | { |
190 | /* Bail if the driver didn't call drm_vblank_init() */ | |
191 | if (dev->num_crtcs == 0) | |
192 | return; | |
193 | ||
7eb3b2c8 | 194 | del_timer_sync(&dev->vblank_disable_timer); |
0a3e67a4 JB |
195 | |
196 | vblank_disable_fn((unsigned long)dev); | |
197 | ||
5380e929 | 198 | kfree(dev->vblank); |
0a3e67a4 JB |
199 | |
200 | dev->num_crtcs = 0; | |
201 | } | |
e77cef9c | 202 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 JB |
203 | |
204 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) | |
205 | { | |
206 | int i, ret = -ENOMEM; | |
207 | ||
208 | setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, | |
209 | (unsigned long)dev); | |
210 | spin_lock_init(&dev->vbl_lock); | |
27641c3f MK |
211 | spin_lock_init(&dev->vblank_time_lock); |
212 | ||
0a3e67a4 JB |
213 | dev->num_crtcs = num_crtcs; |
214 | ||
5380e929 VS |
215 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
216 | if (!dev->vblank) | |
0a3e67a4 JB |
217 | goto err; |
218 | ||
5380e929 VS |
219 | for (i = 0; i < num_crtcs; i++) |
220 | init_waitqueue_head(&dev->vblank[i].queue); | |
27641c3f | 221 | |
8f6fce03 | 222 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
223 | |
224 | /* Driver specific high-precision vblank timestamping supported? */ | |
225 | if (dev->driver->get_vblank_timestamp) | |
226 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
227 | else | |
228 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
229 | ||
ba0bf120 VS |
230 | dev->vblank_disable_allowed = false; |
231 | ||
0a3e67a4 JB |
232 | return 0; |
233 | ||
234 | err: | |
235 | drm_vblank_cleanup(dev); | |
236 | return ret; | |
237 | } | |
238 | EXPORT_SYMBOL(drm_vblank_init); | |
239 | ||
28d52043 DA |
240 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
241 | { | |
242 | struct drm_device *dev = cookie; | |
243 | ||
244 | if (dev->driver->vgaarb_irq) { | |
245 | dev->driver->vgaarb_irq(dev, state); | |
246 | return; | |
247 | } | |
248 | ||
249 | if (!dev->irq_enabled) | |
250 | return; | |
251 | ||
5037f8ac JS |
252 | if (state) { |
253 | if (dev->driver->irq_uninstall) | |
254 | dev->driver->irq_uninstall(dev); | |
255 | } else { | |
256 | if (dev->driver->irq_preinstall) | |
257 | dev->driver->irq_preinstall(dev); | |
258 | if (dev->driver->irq_postinstall) | |
259 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
260 | } |
261 | } | |
262 | ||
1da177e4 LT |
263 | /** |
264 | * Install IRQ handler. | |
265 | * | |
266 | * \param dev DRM device. | |
1da177e4 | 267 | * |
0a3e67a4 | 268 | * Initializes the IRQ related data. Installs the handler, calling the driver |
884a53ef | 269 | * \c irq_preinstall() and \c irq_postinstall() functions |
1da177e4 LT |
270 | * before and after the installation. |
271 | */ | |
0a3e67a4 | 272 | int drm_irq_install(struct drm_device *dev) |
1da177e4 | 273 | { |
4a1b0714 | 274 | int ret; |
b5e89ed5 | 275 | unsigned long sh_flags = 0; |
b8da7de5 | 276 | char *irqname; |
1da177e4 LT |
277 | |
278 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
279 | return -EINVAL; | |
280 | ||
dcdb1674 | 281 | if (drm_dev_to_irq(dev) == 0) |
1da177e4 LT |
282 | return -EINVAL; |
283 | ||
30e2fb18 | 284 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
285 | |
286 | /* Driver must have been initialized */ | |
b5e89ed5 | 287 | if (!dev->dev_private) { |
30e2fb18 | 288 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
289 | return -EINVAL; |
290 | } | |
291 | ||
b5e89ed5 | 292 | if (dev->irq_enabled) { |
30e2fb18 | 293 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
294 | return -EBUSY; |
295 | } | |
4423843c | 296 | dev->irq_enabled = true; |
30e2fb18 | 297 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 298 | |
dcdb1674 | 299 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
1da177e4 | 300 | |
b5e89ed5 | 301 | /* Before installing handler */ |
5037f8ac JS |
302 | if (dev->driver->irq_preinstall) |
303 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 304 | |
b5e89ed5 | 305 | /* Install handler */ |
1da177e4 | 306 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 307 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 308 | |
b8da7de5 DA |
309 | if (dev->devname) |
310 | irqname = dev->devname; | |
311 | else | |
312 | irqname = dev->driver->name; | |
313 | ||
9bfbd5cb | 314 | ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, |
b8da7de5 | 315 | sh_flags, irqname, dev); |
9bfbd5cb | 316 | |
b5e89ed5 | 317 | if (ret < 0) { |
30e2fb18 | 318 | mutex_lock(&dev->struct_mutex); |
4423843c | 319 | dev->irq_enabled = false; |
30e2fb18 | 320 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
321 | return ret; |
322 | } | |
323 | ||
28d52043 DA |
324 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
325 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
326 | ||
b5e89ed5 | 327 | /* After installing handler */ |
5037f8ac JS |
328 | if (dev->driver->irq_postinstall) |
329 | ret = dev->driver->irq_postinstall(dev); | |
330 | ||
0a3e67a4 JB |
331 | if (ret < 0) { |
332 | mutex_lock(&dev->struct_mutex); | |
4423843c | 333 | dev->irq_enabled = false; |
0a3e67a4 | 334 | mutex_unlock(&dev->struct_mutex); |
e1c44acc JS |
335 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
336 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
337 | free_irq(drm_dev_to_irq(dev), dev); | |
0a3e67a4 | 338 | } |
1da177e4 | 339 | |
0a3e67a4 | 340 | return ret; |
1da177e4 | 341 | } |
0a3e67a4 | 342 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
343 | |
344 | /** | |
345 | * Uninstall the IRQ handler. | |
346 | * | |
347 | * \param dev DRM device. | |
348 | * | |
884a53ef | 349 | * Calls the driver's \c irq_uninstall() function, and stops the irq. |
1da177e4 | 350 | */ |
27641c3f | 351 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 352 | { |
dc1336ff | 353 | unsigned long irqflags; |
4423843c VS |
354 | bool irq_enabled; |
355 | int i; | |
1da177e4 LT |
356 | |
357 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
358 | return -EINVAL; | |
359 | ||
30e2fb18 | 360 | mutex_lock(&dev->struct_mutex); |
1da177e4 | 361 | irq_enabled = dev->irq_enabled; |
4423843c | 362 | dev->irq_enabled = false; |
30e2fb18 | 363 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 364 | |
dc1336ff JB |
365 | /* |
366 | * Wake up any waiters so they don't hang. | |
367 | */ | |
bde4889a BS |
368 | if (dev->num_crtcs) { |
369 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
370 | for (i = 0; i < dev->num_crtcs; i++) { | |
57ed0f7b | 371 | wake_up(&dev->vblank[i].queue); |
5380e929 VS |
372 | dev->vblank[i].enabled = false; |
373 | dev->vblank[i].last = | |
bde4889a BS |
374 | dev->driver->get_vblank_counter(dev, i); |
375 | } | |
376 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 377 | } |
dc1336ff | 378 | |
b5e89ed5 | 379 | if (!irq_enabled) |
1da177e4 LT |
380 | return -EINVAL; |
381 | ||
dcdb1674 | 382 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
1da177e4 | 383 | |
28d52043 DA |
384 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
385 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
386 | ||
5037f8ac JS |
387 | if (dev->driver->irq_uninstall) |
388 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 389 | |
dcdb1674 | 390 | free_irq(drm_dev_to_irq(dev), dev); |
1da177e4 LT |
391 | |
392 | return 0; | |
393 | } | |
394 | EXPORT_SYMBOL(drm_irq_uninstall); | |
395 | ||
396 | /** | |
397 | * IRQ control ioctl. | |
398 | * | |
399 | * \param inode device inode. | |
6c340eac | 400 | * \param file_priv DRM file private. |
1da177e4 LT |
401 | * \param cmd command. |
402 | * \param arg user argument, pointing to a drm_control structure. | |
403 | * \return zero on success or a negative number on failure. | |
404 | * | |
405 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
406 | */ | |
c153f45f EA |
407 | int drm_control(struct drm_device *dev, void *data, |
408 | struct drm_file *file_priv) | |
1da177e4 | 409 | { |
c153f45f | 410 | struct drm_control *ctl = data; |
b5e89ed5 | 411 | |
27641c3f MK |
412 | /* if we haven't irq we fallback for compatibility reasons - |
413 | * this used to be a separate function in drm_dma.h | |
414 | */ | |
1da177e4 | 415 | |
1da177e4 | 416 | |
c153f45f | 417 | switch (ctl->func) { |
1da177e4 LT |
418 | case DRM_INST_HANDLER: |
419 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
420 | return 0; | |
f453ba04 DA |
421 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
422 | return 0; | |
1da177e4 | 423 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
dcdb1674 | 424 | ctl->irq != drm_dev_to_irq(dev)) |
1da177e4 | 425 | return -EINVAL; |
b5e89ed5 | 426 | return drm_irq_install(dev); |
1da177e4 LT |
427 | case DRM_UNINST_HANDLER: |
428 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
429 | return 0; | |
f453ba04 DA |
430 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
431 | return 0; | |
b5e89ed5 | 432 | return drm_irq_uninstall(dev); |
1da177e4 LT |
433 | default: |
434 | return -EINVAL; | |
435 | } | |
436 | } | |
437 | ||
27641c3f MK |
438 | /** |
439 | * drm_calc_timestamping_constants - Calculate and | |
440 | * store various constants which are later needed by | |
441 | * vblank and swap-completion timestamping, e.g, by | |
442 | * drm_calc_vbltimestamp_from_scanoutpos(). | |
443 | * They are derived from crtc's true scanout timing, | |
444 | * so they take things like panel scaling or other | |
445 | * adjustments into account. | |
446 | * | |
447 | * @crtc drm_crtc whose timestamp constants should be updated. | |
545cdd55 | 448 | * @mode display mode containing the scanout timings |
27641c3f MK |
449 | * |
450 | */ | |
545cdd55 VS |
451 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
452 | const struct drm_display_mode *mode) | |
27641c3f MK |
453 | { |
454 | s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; | |
455 | u64 dotclock; | |
456 | ||
457 | /* Dot clock in Hz: */ | |
545cdd55 | 458 | dotclock = (u64) mode->clock * 1000; |
27641c3f | 459 | |
0d7a0a8a MW |
460 | /* Fields of interlaced scanout modes are only half a frame duration. |
461 | * Double the dotclock to get half the frame-/line-/pixelduration. | |
9be6f8a9 | 462 | */ |
545cdd55 | 463 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) |
9be6f8a9 MK |
464 | dotclock *= 2; |
465 | ||
27641c3f MK |
466 | /* Valid dotclock? */ |
467 | if (dotclock > 0) { | |
85a7ce67 | 468 | int frame_size; |
27641c3f MK |
469 | /* Convert scanline length in pixels and video dot clock to |
470 | * line duration, frame duration and pixel duration in | |
471 | * nanoseconds: | |
472 | */ | |
473 | pixeldur_ns = (s64) div64_u64(1000000000, dotclock); | |
545cdd55 | 474 | linedur_ns = (s64) div64_u64(((u64) mode->crtc_htotal * |
27641c3f | 475 | 1000000000), dotclock); |
545cdd55 | 476 | frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
85a7ce67 DK |
477 | framedur_ns = (s64) div64_u64((u64) frame_size * 1000000000, |
478 | dotclock); | |
27641c3f MK |
479 | } else |
480 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", | |
481 | crtc->base.id); | |
482 | ||
483 | crtc->pixeldur_ns = pixeldur_ns; | |
484 | crtc->linedur_ns = linedur_ns; | |
485 | crtc->framedur_ns = framedur_ns; | |
486 | ||
487 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
545cdd55 VS |
488 | crtc->base.id, mode->crtc_htotal, |
489 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
27641c3f MK |
490 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", |
491 | crtc->base.id, (int) dotclock/1000, (int) framedur_ns, | |
492 | (int) linedur_ns, (int) pixeldur_ns); | |
493 | } | |
494 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
495 | ||
496 | /** | |
497 | * drm_calc_vbltimestamp_from_scanoutpos - helper routine for kms | |
498 | * drivers. Implements calculation of exact vblank timestamps from | |
499 | * given drm_display_mode timings and current video scanout position | |
500 | * of a crtc. This can be called from within get_vblank_timestamp() | |
501 | * implementation of a kms driver to implement the actual timestamping. | |
502 | * | |
503 | * Should return timestamps conforming to the OML_sync_control OpenML | |
504 | * extension specification. The timestamp corresponds to the end of | |
505 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
506 | * pixel in the following video frame. | |
507 | * | |
508 | * Requires support for optional dev->driver->get_scanout_position() | |
509 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
510 | * that corresponds to the true scanout timing. | |
511 | * | |
512 | * The current implementation only handles standard video modes. It | |
513 | * returns as no operation if a doublescan or interlaced video mode is | |
514 | * active. Higher level code is expected to handle this. | |
515 | * | |
516 | * @dev: DRM device. | |
517 | * @crtc: Which crtc's vblank timestamp to retrieve. | |
518 | * @max_error: Desired maximum allowable error in timestamps (nanosecs). | |
519 | * On return contains true maximum error of timestamp. | |
520 | * @vblank_time: Pointer to struct timeval which should receive the timestamp. | |
521 | * @flags: Flags to pass to driver: | |
522 | * 0 = Default. | |
523 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. | |
524 | * @refcrtc: drm_crtc* of crtc which defines scanout timing. | |
525 | * | |
526 | * Returns negative value on error, failure or if not supported in current | |
527 | * video mode: | |
528 | * | |
529 | * -EINVAL - Invalid crtc. | |
530 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. | |
531 | * -ENOTSUPP - Function not supported in current display mode. | |
532 | * -EIO - Failed, e.g., due to failed scanout position query. | |
533 | * | |
534 | * Returns or'ed positive status flags on success: | |
535 | * | |
536 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
537 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
538 | * | |
539 | */ | |
540 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, | |
541 | int *max_error, | |
542 | struct timeval *vblank_time, | |
543 | unsigned flags, | |
544 | struct drm_crtc *refcrtc) | |
545 | { | |
e62f2f5a ID |
546 | ktime_t stime, etime, mono_time_offset; |
547 | struct timeval tv_etime; | |
27641c3f MK |
548 | struct drm_display_mode *mode; |
549 | int vbl_status, vtotal, vdisplay; | |
550 | int vpos, hpos, i; | |
551 | s64 framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; | |
552 | bool invbl; | |
553 | ||
554 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
555 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
556 | return -EINVAL; | |
557 | } | |
558 | ||
559 | /* Scanout position query not supported? Should not happen. */ | |
560 | if (!dev->driver->get_scanout_position) { | |
561 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
562 | return -EIO; | |
563 | } | |
564 | ||
565 | mode = &refcrtc->hwmode; | |
566 | vtotal = mode->crtc_vtotal; | |
567 | vdisplay = mode->crtc_vdisplay; | |
568 | ||
569 | /* Durations of frames, lines, pixels in nanoseconds. */ | |
570 | framedur_ns = refcrtc->framedur_ns; | |
571 | linedur_ns = refcrtc->linedur_ns; | |
572 | pixeldur_ns = refcrtc->pixeldur_ns; | |
573 | ||
574 | /* If mode timing undefined, just return as no-op: | |
575 | * Happens during initial modesetting of a crtc. | |
576 | */ | |
577 | if (vtotal <= 0 || vdisplay <= 0 || framedur_ns == 0) { | |
578 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); | |
579 | return -EAGAIN; | |
580 | } | |
581 | ||
27641c3f MK |
582 | /* Get current scanout position with system timestamp. |
583 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
584 | * if single query takes longer than max_error nanoseconds. | |
585 | * | |
586 | * This guarantees a tight bound on maximum error if | |
587 | * code gets preempted or delayed for some reason. | |
588 | */ | |
589 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
590 | /* |
591 | * Get vertical and horizontal scanout position vpos, hpos, | |
592 | * and bounding timestamps stime, etime, pre/post query. | |
593 | */ | |
594 | vbl_status = dev->driver->get_scanout_position(dev, crtc, &vpos, | |
595 | &hpos, &stime, &etime); | |
27641c3f | 596 | |
8f6fce03 MK |
597 | /* |
598 | * Get correction for CLOCK_MONOTONIC -> CLOCK_REALTIME if | |
599 | * CLOCK_REALTIME is requested. | |
600 | */ | |
c61eef72 ID |
601 | if (!drm_timestamp_monotonic) |
602 | mono_time_offset = ktime_get_monotonic_offset(); | |
27641c3f | 603 | |
27641c3f MK |
604 | /* Return as no-op if scanout query unsupported or failed. */ |
605 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
606 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
607 | crtc, vbl_status); | |
608 | return -EIO; | |
609 | } | |
610 | ||
8f6fce03 | 611 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 612 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
613 | |
614 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
615 | if (duration_ns <= (s64) *max_error) | |
616 | break; | |
617 | } | |
618 | ||
619 | /* Noisy system timing? */ | |
620 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
621 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
622 | crtc, (int) duration_ns/1000, *max_error/1000, i); | |
623 | } | |
624 | ||
625 | /* Return upper bound of timestamp precision error. */ | |
626 | *max_error = (int) duration_ns; | |
627 | ||
628 | /* Check if in vblank area: | |
629 | * vpos is >=0 in video scanout area, but negative | |
630 | * within vblank area, counting down the number of lines until | |
631 | * start of scanout. | |
632 | */ | |
633 | invbl = vbl_status & DRM_SCANOUTPOS_INVBL; | |
634 | ||
635 | /* Convert scanout position into elapsed time at raw_time query | |
636 | * since start of scanout at first display scanline. delta_ns | |
637 | * can be negative if start of scanout hasn't happened yet. | |
638 | */ | |
639 | delta_ns = (s64) vpos * linedur_ns + (s64) hpos * pixeldur_ns; | |
640 | ||
641 | /* Is vpos outside nominal vblank area, but less than | |
642 | * 1/100 of a frame height away from start of vblank? | |
643 | * If so, assume this isn't a massively delayed vblank | |
644 | * interrupt, but a vblank interrupt that fired a few | |
645 | * microseconds before true start of vblank. Compensate | |
646 | * by adding a full frame duration to the final timestamp. | |
647 | * Happens, e.g., on ATI R500, R600. | |
648 | * | |
649 | * We only do this if DRM_CALLED_FROM_VBLIRQ. | |
650 | */ | |
651 | if ((flags & DRM_CALLED_FROM_VBLIRQ) && !invbl && | |
652 | ((vdisplay - vpos) < vtotal / 100)) { | |
653 | delta_ns = delta_ns - framedur_ns; | |
654 | ||
655 | /* Signal this correction as "applied". */ | |
656 | vbl_status |= 0x8; | |
657 | } | |
658 | ||
c61eef72 ID |
659 | if (!drm_timestamp_monotonic) |
660 | etime = ktime_sub(etime, mono_time_offset); | |
661 | ||
e62f2f5a ID |
662 | /* save this only for debugging purposes */ |
663 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
664 | /* Subtract time delta from raw timestamp to get final |
665 | * vblank_time timestamp for end of vblank. | |
666 | */ | |
e91abf80 MD |
667 | if (delta_ns < 0) |
668 | etime = ktime_add_ns(etime, -delta_ns); | |
669 | else | |
670 | etime = ktime_sub_ns(etime, delta_ns); | |
e62f2f5a | 671 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 672 | |
bbb0aef5 JP |
673 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
674 | crtc, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 675 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 JP |
676 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
677 | (int)duration_ns/1000, i); | |
27641c3f MK |
678 | |
679 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
680 | if (invbl) | |
681 | vbl_status |= DRM_VBLANKTIME_INVBL; | |
682 | ||
683 | return vbl_status; | |
684 | } | |
685 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
686 | ||
c61eef72 ID |
687 | static struct timeval get_drm_timestamp(void) |
688 | { | |
689 | ktime_t now; | |
690 | ||
691 | now = ktime_get(); | |
692 | if (!drm_timestamp_monotonic) | |
693 | now = ktime_sub(now, ktime_get_monotonic_offset()); | |
694 | ||
695 | return ktime_to_timeval(now); | |
696 | } | |
697 | ||
27641c3f MK |
698 | /** |
699 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
700 | * vblank interval. | |
701 | * | |
702 | * @dev: DRM device | |
703 | * @crtc: which crtc's vblank timestamp to retrieve | |
704 | * @tvblank: Pointer to target struct timeval which should receive the timestamp | |
705 | * @flags: Flags to pass to driver: | |
706 | * 0 = Default. | |
707 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. | |
708 | * | |
709 | * Fetches the system timestamp corresponding to the time of the most recent | |
710 | * vblank interval on specified crtc. May call into kms-driver to | |
711 | * compute the timestamp with a high-precision GPU specific method. | |
712 | * | |
713 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
714 | * call, i.e., it isn't very precisely locked to the true vblank. | |
715 | * | |
716 | * Returns non-zero if timestamp is considered to be very precise. | |
717 | */ | |
718 | u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
719 | struct timeval *tvblank, unsigned flags) | |
720 | { | |
4a1b0714 | 721 | int ret; |
27641c3f MK |
722 | |
723 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
724 | int max_error = (int) drm_timestamp_precision * 1000; | |
725 | ||
726 | /* Query driver if possible and precision timestamping enabled. */ | |
727 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
728 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
729 | tvblank, flags); | |
730 | if (ret > 0) | |
731 | return (u32) ret; | |
732 | } | |
733 | ||
734 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 735 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 736 | */ |
c61eef72 | 737 | *tvblank = get_drm_timestamp(); |
27641c3f MK |
738 | |
739 | return 0; | |
740 | } | |
741 | EXPORT_SYMBOL(drm_get_last_vbltimestamp); | |
742 | ||
0a3e67a4 JB |
743 | /** |
744 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
745 | * @dev: DRM device | |
746 | * @crtc: which counter to retrieve | |
747 | * | |
748 | * Fetches the "cooked" vblank count value that represents the number of | |
749 | * vblank events since the system was booted, including lost events due to | |
750 | * modesetting activity. | |
751 | */ | |
752 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
753 | { | |
5380e929 | 754 | return atomic_read(&dev->vblank[crtc].count); |
0a3e67a4 JB |
755 | } |
756 | EXPORT_SYMBOL(drm_vblank_count); | |
757 | ||
27641c3f MK |
758 | /** |
759 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
760 | * and the system timestamp corresponding to that vblank counter value. | |
761 | * | |
762 | * @dev: DRM device | |
763 | * @crtc: which counter to retrieve | |
764 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
765 | * | |
766 | * Fetches the "cooked" vblank count value that represents the number of | |
767 | * vblank events since the system was booted, including lost events due to | |
768 | * modesetting activity. Returns corresponding system timestamp of the time | |
769 | * of the vblank interval that corresponds to the current value vblank counter | |
770 | * value. | |
771 | */ | |
772 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
773 | struct timeval *vblanktime) | |
774 | { | |
775 | u32 cur_vblank; | |
776 | ||
777 | /* Read timestamp from slot of _vblank_time ringbuffer | |
778 | * that corresponds to current vblank count. Retry if | |
779 | * count has incremented during readout. This works like | |
780 | * a seqlock. | |
781 | */ | |
782 | do { | |
5380e929 | 783 | cur_vblank = atomic_read(&dev->vblank[crtc].count); |
27641c3f MK |
784 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); |
785 | smp_rmb(); | |
5380e929 | 786 | } while (cur_vblank != atomic_read(&dev->vblank[crtc].count)); |
27641c3f MK |
787 | |
788 | return cur_vblank; | |
789 | } | |
790 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
791 | ||
c6eefa17 RC |
792 | static void send_vblank_event(struct drm_device *dev, |
793 | struct drm_pending_vblank_event *e, | |
794 | unsigned long seq, struct timeval *now) | |
795 | { | |
796 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
797 | e->event.sequence = seq; | |
798 | e->event.tv_sec = now->tv_sec; | |
799 | e->event.tv_usec = now->tv_usec; | |
800 | ||
801 | list_add_tail(&e->base.link, | |
802 | &e->base.file_priv->event_list); | |
803 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
804 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
805 | e->event.sequence); | |
806 | } | |
807 | ||
808 | /** | |
809 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
810 | * @dev: DRM device | |
811 | * @crtc: CRTC in question | |
812 | * @e: the event to send | |
813 | * | |
814 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
815 | * Caller must hold event lock. | |
816 | */ | |
817 | void drm_send_vblank_event(struct drm_device *dev, int crtc, | |
818 | struct drm_pending_vblank_event *e) | |
819 | { | |
820 | struct timeval now; | |
821 | unsigned int seq; | |
822 | if (crtc >= 0) { | |
823 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
824 | } else { | |
825 | seq = 0; | |
c61eef72 ID |
826 | |
827 | now = get_drm_timestamp(); | |
c6eefa17 | 828 | } |
21a245d2 | 829 | e->pipe = crtc; |
c6eefa17 RC |
830 | send_vblank_event(dev, e, seq, &now); |
831 | } | |
832 | EXPORT_SYMBOL(drm_send_vblank_event); | |
833 | ||
0a3e67a4 JB |
834 | /** |
835 | * drm_update_vblank_count - update the master vblank counter | |
836 | * @dev: DRM device | |
837 | * @crtc: counter to update | |
838 | * | |
839 | * Call back into the driver to update the appropriate vblank counter | |
840 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
841 | * update the last read value so we can deal with wraparound on the next | |
842 | * call if necessary. | |
843 | * | |
844 | * Only necessary when going from off->on, to account for frames we | |
845 | * didn't get an interrupt for. | |
846 | * | |
847 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
848 | * device vblank fields. | |
849 | */ | |
850 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
851 | { | |
27641c3f MK |
852 | u32 cur_vblank, diff, tslot, rc; |
853 | struct timeval t_vblank; | |
0a3e67a4 JB |
854 | |
855 | /* | |
856 | * Interrupts were disabled prior to this call, so deal with counter | |
857 | * wrap if needed. | |
858 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
859 | * here if the register is small or we had vblank interrupts off for | |
860 | * a long time. | |
27641c3f MK |
861 | * |
862 | * We repeat the hardware vblank counter & timestamp query until | |
863 | * we get consistent results. This to prevent races between gpu | |
864 | * updating its hardware counter while we are retrieving the | |
865 | * corresponding vblank timestamp. | |
0a3e67a4 | 866 | */ |
27641c3f MK |
867 | do { |
868 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
869 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
870 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
871 | ||
872 | /* Deal with counter wrap */ | |
5380e929 VS |
873 | diff = cur_vblank - dev->vblank[crtc].last; |
874 | if (cur_vblank < dev->vblank[crtc].last) { | |
0a3e67a4 JB |
875 | diff += dev->max_vblank_count; |
876 | ||
877 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
5380e929 | 878 | crtc, dev->vblank[crtc].last, cur_vblank, diff); |
0a3e67a4 JB |
879 | } |
880 | ||
881 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", | |
882 | crtc, diff); | |
883 | ||
27641c3f MK |
884 | /* Reinitialize corresponding vblank timestamp if high-precision query |
885 | * available. Skip this step if query unsupported or failed. Will | |
886 | * reinitialize delayed at next vblank interrupt in that case. | |
887 | */ | |
888 | if (rc) { | |
5380e929 | 889 | tslot = atomic_read(&dev->vblank[crtc].count) + diff; |
27641c3f | 890 | vblanktimestamp(dev, crtc, tslot) = t_vblank; |
27641c3f MK |
891 | } |
892 | ||
bc215128 | 893 | smp_mb__before_atomic_inc(); |
5380e929 | 894 | atomic_add(diff, &dev->vblank[crtc].count); |
bc215128 | 895 | smp_mb__after_atomic_inc(); |
0a3e67a4 JB |
896 | } |
897 | ||
898 | /** | |
899 | * drm_vblank_get - get a reference count on vblank events | |
900 | * @dev: DRM device | |
901 | * @crtc: which CRTC to own | |
902 | * | |
903 | * Acquire a reference count on vblank events to avoid having them disabled | |
904 | * while in use. | |
905 | * | |
906 | * RETURNS | |
907 | * Zero on success, nonzero on failure. | |
908 | */ | |
909 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
910 | { | |
27641c3f | 911 | unsigned long irqflags, irqflags2; |
0a3e67a4 JB |
912 | int ret = 0; |
913 | ||
914 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
915 | /* Going from 0->1 means we have to enable interrupts again */ | |
5380e929 | 916 | if (atomic_add_return(1, &dev->vblank[crtc].refcount) == 1) { |
27641c3f | 917 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags2); |
5380e929 | 918 | if (!dev->vblank[crtc].enabled) { |
27641c3f MK |
919 | /* Enable vblank irqs under vblank_time_lock protection. |
920 | * All vblank count & timestamp updates are held off | |
921 | * until we are done reinitializing master counter and | |
922 | * timestamps. Filtercode in drm_handle_vblank() will | |
923 | * prevent double-accounting of same vblank interval. | |
924 | */ | |
778c9026 | 925 | ret = dev->driver->enable_vblank(dev, crtc); |
27641c3f MK |
926 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", |
927 | crtc, ret); | |
778c9026 | 928 | if (ret) |
5380e929 | 929 | atomic_dec(&dev->vblank[crtc].refcount); |
778c9026 | 930 | else { |
5380e929 | 931 | dev->vblank[crtc].enabled = true; |
778c9026 LP |
932 | drm_update_vblank_count(dev, crtc); |
933 | } | |
934 | } | |
27641c3f | 935 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2); |
778c9026 | 936 | } else { |
5380e929 VS |
937 | if (!dev->vblank[crtc].enabled) { |
938 | atomic_dec(&dev->vblank[crtc].refcount); | |
778c9026 | 939 | ret = -EINVAL; |
0a3e67a4 JB |
940 | } |
941 | } | |
942 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
943 | ||
944 | return ret; | |
945 | } | |
946 | EXPORT_SYMBOL(drm_vblank_get); | |
947 | ||
948 | /** | |
949 | * drm_vblank_put - give up ownership of vblank events | |
950 | * @dev: DRM device | |
951 | * @crtc: which counter to give up | |
952 | * | |
953 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 954 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
0a3e67a4 JB |
955 | */ |
956 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
957 | { | |
5380e929 | 958 | BUG_ON(atomic_read(&dev->vblank[crtc].refcount) == 0); |
b3f5e732 | 959 | |
0a3e67a4 | 960 | /* Last user schedules interrupt disable */ |
5380e929 | 961 | if (atomic_dec_and_test(&dev->vblank[crtc].refcount) && |
27641c3f MK |
962 | (drm_vblank_offdelay > 0)) |
963 | mod_timer(&dev->vblank_disable_timer, | |
bfd8303a | 964 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); |
0a3e67a4 JB |
965 | } |
966 | EXPORT_SYMBOL(drm_vblank_put); | |
967 | ||
c6eefa17 RC |
968 | /** |
969 | * drm_vblank_off - disable vblank events on a CRTC | |
970 | * @dev: DRM device | |
971 | * @crtc: CRTC in question | |
972 | * | |
973 | * Caller must hold event lock. | |
974 | */ | |
778c9026 LP |
975 | void drm_vblank_off(struct drm_device *dev, int crtc) |
976 | { | |
498548ec CJHR |
977 | struct drm_pending_vblank_event *e, *t; |
978 | struct timeval now; | |
778c9026 | 979 | unsigned long irqflags; |
498548ec | 980 | unsigned int seq; |
778c9026 LP |
981 | |
982 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
27641c3f | 983 | vblank_disable_and_save(dev, crtc); |
57ed0f7b | 984 | wake_up(&dev->vblank[crtc].queue); |
498548ec CJHR |
985 | |
986 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
987 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
e7783ba3 ID |
988 | |
989 | spin_lock(&dev->event_lock); | |
498548ec CJHR |
990 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
991 | if (e->pipe != crtc) | |
992 | continue; | |
993 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
994 | wanted %d, current %d\n", | |
995 | e->event.sequence, seq); | |
c6eefa17 | 996 | list_del(&e->base.link); |
498548ec | 997 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 998 | send_vblank_event(dev, e, seq, &now); |
498548ec | 999 | } |
e7783ba3 | 1000 | spin_unlock(&dev->event_lock); |
498548ec | 1001 | |
778c9026 LP |
1002 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
1003 | } | |
1004 | EXPORT_SYMBOL(drm_vblank_off); | |
1005 | ||
f453ba04 DA |
1006 | /** |
1007 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1008 | * @dev: DRM device | |
1009 | * @crtc: CRTC in question | |
f453ba04 DA |
1010 | * |
1011 | * Account for vblank events across mode setting events, which will likely | |
1012 | * reset the hardware frame counter. | |
1013 | */ | |
1014 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
1015 | { | |
b7ea85a4 | 1016 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1017 | if (!dev->num_crtcs) |
1018 | return; | |
f453ba04 DA |
1019 | /* |
1020 | * To avoid all the problems that might happen if interrupts | |
1021 | * were enabled/disabled around or between these calls, we just | |
1022 | * have the kernel take a reference on the CRTC (just once though | |
1023 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1024 | * so that interrupts remain enabled in the interim. | |
1025 | */ | |
5380e929 VS |
1026 | if (!dev->vblank[crtc].inmodeset) { |
1027 | dev->vblank[crtc].inmodeset = 0x1; | |
b3f5e732 | 1028 | if (drm_vblank_get(dev, crtc) == 0) |
5380e929 | 1029 | dev->vblank[crtc].inmodeset |= 0x2; |
f453ba04 DA |
1030 | } |
1031 | } | |
1032 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1033 | ||
1034 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) | |
1035 | { | |
1036 | unsigned long irqflags; | |
1037 | ||
b7ea85a4 HC |
1038 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1039 | if (!dev->num_crtcs) | |
1040 | return; | |
1041 | ||
5380e929 | 1042 | if (dev->vblank[crtc].inmodeset) { |
f453ba04 | 1043 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
ba0bf120 | 1044 | dev->vblank_disable_allowed = true; |
f453ba04 | 1045 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1046 | |
5380e929 | 1047 | if (dev->vblank[crtc].inmodeset & 0x2) |
b3f5e732 CW |
1048 | drm_vblank_put(dev, crtc); |
1049 | ||
5380e929 | 1050 | dev->vblank[crtc].inmodeset = 0; |
f453ba04 DA |
1051 | } |
1052 | } | |
1053 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1054 | ||
0a3e67a4 JB |
1055 | /** |
1056 | * drm_modeset_ctl - handle vblank event counter changes across mode switch | |
1057 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1058 | * | |
1059 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1060 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1061 | * | |
1062 | * Generally the counter will reset across mode sets. If interrupts are | |
1063 | * enabled around this call, we don't have to do anything since the counter | |
1064 | * will have already been incremented. | |
1065 | */ | |
1066 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1067 | struct drm_file *file_priv) | |
1068 | { | |
1069 | struct drm_modeset_ctl *modeset = data; | |
19227561 | 1070 | unsigned int crtc; |
0a3e67a4 JB |
1071 | |
1072 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1073 | if (!dev->num_crtcs) | |
4a1b0714 | 1074 | return 0; |
0a3e67a4 | 1075 | |
29935554 LP |
1076 | /* KMS drivers handle this internally */ |
1077 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1078 | return 0; | |
1079 | ||
0a3e67a4 | 1080 | crtc = modeset->crtc; |
4a1b0714 LP |
1081 | if (crtc >= dev->num_crtcs) |
1082 | return -EINVAL; | |
0a3e67a4 | 1083 | |
0a3e67a4 JB |
1084 | switch (modeset->cmd) { |
1085 | case _DRM_PRE_MODESET: | |
f453ba04 | 1086 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1087 | break; |
1088 | case _DRM_POST_MODESET: | |
f453ba04 | 1089 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1090 | break; |
1091 | default: | |
4a1b0714 | 1092 | return -EINVAL; |
0a3e67a4 JB |
1093 | } |
1094 | ||
4a1b0714 | 1095 | return 0; |
0a3e67a4 JB |
1096 | } |
1097 | ||
c9a9c5e0 KH |
1098 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1099 | union drm_wait_vblank *vblwait, | |
1100 | struct drm_file *file_priv) | |
1101 | { | |
1102 | struct drm_pending_vblank_event *e; | |
1103 | struct timeval now; | |
1104 | unsigned long flags; | |
1105 | unsigned int seq; | |
ea5d552c | 1106 | int ret; |
c9a9c5e0 KH |
1107 | |
1108 | e = kzalloc(sizeof *e, GFP_KERNEL); | |
ea5d552c CW |
1109 | if (e == NULL) { |
1110 | ret = -ENOMEM; | |
1111 | goto err_put; | |
1112 | } | |
c9a9c5e0 KH |
1113 | |
1114 | e->pipe = pipe; | |
b9c2c9ae | 1115 | e->base.pid = current->pid; |
c9a9c5e0 KH |
1116 | e->event.base.type = DRM_EVENT_VBLANK; |
1117 | e->event.base.length = sizeof e->event; | |
1118 | e->event.user_data = vblwait->request.signal; | |
1119 | e->base.event = &e->event.base; | |
1120 | e->base.file_priv = file_priv; | |
1121 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1122 | ||
c9a9c5e0 KH |
1123 | spin_lock_irqsave(&dev->event_lock, flags); |
1124 | ||
1125 | if (file_priv->event_space < sizeof e->event) { | |
ea5d552c CW |
1126 | ret = -EBUSY; |
1127 | goto err_unlock; | |
c9a9c5e0 KH |
1128 | } |
1129 | ||
1130 | file_priv->event_space -= sizeof e->event; | |
27641c3f MK |
1131 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1132 | ||
c9a9c5e0 KH |
1133 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1134 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1135 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1136 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1137 | } |
1138 | ||
1139 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1140 | vblwait->request.sequence, seq, pipe); | |
1141 | ||
b9c2c9ae JB |
1142 | trace_drm_vblank_event_queued(current->pid, pipe, |
1143 | vblwait->request.sequence); | |
1144 | ||
c9a9c5e0 KH |
1145 | e->event.sequence = vblwait->request.sequence; |
1146 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1147 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1148 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1149 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1150 | } else { |
a6778e9e | 1151 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1152 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1153 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1154 | } |
1155 | ||
1156 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1157 | ||
1158 | return 0; | |
ea5d552c CW |
1159 | |
1160 | err_unlock: | |
1161 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1162 | kfree(e); | |
1163 | err_put: | |
6f331623 | 1164 | drm_vblank_put(dev, pipe); |
ea5d552c | 1165 | return ret; |
c9a9c5e0 KH |
1166 | } |
1167 | ||
1da177e4 LT |
1168 | /** |
1169 | * Wait for VBLANK. | |
1170 | * | |
1171 | * \param inode device inode. | |
6c340eac | 1172 | * \param file_priv DRM file private. |
1da177e4 LT |
1173 | * \param cmd command. |
1174 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1175 | * \return zero on success or a negative number on failure. | |
1176 | * | |
30b23634 EA |
1177 | * This function enables the vblank interrupt on the pipe requested, then |
1178 | * sleeps waiting for the requested sequence number to occur, and drops | |
1179 | * the vblank interrupt refcount afterwards. (vblank irq disable follows that | |
1180 | * after a timeout with no further vblank waits scheduled). | |
1da177e4 | 1181 | */ |
0a3e67a4 JB |
1182 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1183 | struct drm_file *file_priv) | |
1da177e4 | 1184 | { |
c153f45f | 1185 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1186 | int ret; |
19b01b5f | 1187 | unsigned int flags, seq, crtc, high_crtc; |
1da177e4 | 1188 | |
03f6509d TR |
1189 | if (drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
1190 | if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled)) | |
1191 | return -EINVAL; | |
1da177e4 | 1192 | |
30b23634 EA |
1193 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1194 | return -EINVAL; | |
1195 | ||
c153f45f | 1196 | if (vblwait->request.type & |
19b01b5f IH |
1197 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1198 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1199 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1200 | vblwait->request.type, |
19b01b5f IH |
1201 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1202 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MCA |
1203 | return -EINVAL; |
1204 | } | |
1205 | ||
c153f45f | 1206 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
19b01b5f IH |
1207 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1208 | if (high_crtc) | |
1209 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1210 | else | |
1211 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
0a3e67a4 | 1212 | if (crtc >= dev->num_crtcs) |
776c9443 MCA |
1213 | return -EINVAL; |
1214 | ||
0a3e67a4 JB |
1215 | ret = drm_vblank_get(dev, crtc); |
1216 | if (ret) { | |
8d3457ec | 1217 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1218 | return ret; |
1219 | } | |
1220 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1221 | |
c153f45f | 1222 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1223 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1224 | vblwait->request.sequence += seq; |
1225 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1226 | case _DRM_VBLANK_ABSOLUTE: |
1227 | break; | |
1228 | default: | |
0a3e67a4 JB |
1229 | ret = -EINVAL; |
1230 | goto done; | |
1da177e4 LT |
1231 | } |
1232 | ||
a6778e9e IH |
1233 | if (flags & _DRM_VBLANK_EVENT) { |
1234 | /* must hold on to the vblank ref until the event fires | |
1235 | * drm_vblank_put will be called asynchronously | |
1236 | */ | |
c9a9c5e0 | 1237 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); |
a6778e9e | 1238 | } |
c9a9c5e0 | 1239 | |
ab285d74 | 1240 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1241 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1242 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
1243 | } |
1244 | ||
30b23634 EA |
1245 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1246 | vblwait->request.sequence, crtc); | |
5380e929 | 1247 | dev->vblank[crtc].last_wait = vblwait->request.sequence; |
bfd8303a | 1248 | DRM_WAIT_ON(ret, dev->vblank[crtc].queue, 3 * HZ, |
30b23634 EA |
1249 | (((drm_vblank_count(dev, crtc) - |
1250 | vblwait->request.sequence) <= (1 << 23)) || | |
1251 | !dev->irq_enabled)); | |
1da177e4 | 1252 | |
30b23634 EA |
1253 | if (ret != -EINTR) { |
1254 | struct timeval now; | |
1da177e4 | 1255 | |
27641c3f | 1256 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1257 | vblwait->reply.tval_sec = now.tv_sec; |
1258 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1259 | |
30b23634 EA |
1260 | DRM_DEBUG("returning %d to client\n", |
1261 | vblwait->reply.sequence); | |
1da177e4 | 1262 | } else { |
30b23634 | 1263 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1264 | } |
1265 | ||
0a3e67a4 JB |
1266 | done: |
1267 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1268 | return ret; |
1269 | } | |
1270 | ||
ea7f7abc | 1271 | static void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
c9a9c5e0 KH |
1272 | { |
1273 | struct drm_pending_vblank_event *e, *t; | |
1274 | struct timeval now; | |
1275 | unsigned long flags; | |
1276 | unsigned int seq; | |
1277 | ||
27641c3f | 1278 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1279 | |
1280 | spin_lock_irqsave(&dev->event_lock, flags); | |
1281 | ||
1282 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1283 | if (e->pipe != crtc) | |
1284 | continue; | |
1285 | if ((seq - e->event.sequence) > (1<<23)) | |
1286 | continue; | |
1287 | ||
1288 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1289 | e->event.sequence, seq); | |
1290 | ||
c6eefa17 | 1291 | list_del(&e->base.link); |
c9a9c5e0 | 1292 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1293 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1294 | } |
1295 | ||
1296 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
ac2874b9 JB |
1297 | |
1298 | trace_drm_vblank_event(crtc, seq); | |
c9a9c5e0 KH |
1299 | } |
1300 | ||
0a3e67a4 JB |
1301 | /** |
1302 | * drm_handle_vblank - handle a vblank event | |
1303 | * @dev: DRM device | |
1304 | * @crtc: where this event occurred | |
1305 | * | |
1306 | * Drivers should call this routine in their vblank interrupt handlers to | |
1307 | * update the vblank counter and send any signals that may be pending. | |
1308 | */ | |
78c6e170 | 1309 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1310 | { |
27641c3f MK |
1311 | u32 vblcount; |
1312 | s64 diff_ns; | |
1313 | struct timeval tvblank; | |
1314 | unsigned long irqflags; | |
1315 | ||
c9a9c5e0 | 1316 | if (!dev->num_crtcs) |
78c6e170 | 1317 | return false; |
c9a9c5e0 | 1318 | |
27641c3f MK |
1319 | /* Need timestamp lock to prevent concurrent execution with |
1320 | * vblank enable/disable, as this would cause inconsistent | |
1321 | * or corrupted timestamps and vblank counts. | |
1322 | */ | |
1323 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
1324 | ||
1325 | /* Vblank irq handling disabled. Nothing to do. */ | |
5380e929 | 1326 | if (!dev->vblank[crtc].enabled) { |
27641c3f | 1327 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
78c6e170 | 1328 | return false; |
27641c3f MK |
1329 | } |
1330 | ||
1331 | /* Fetch corresponding timestamp for this vblank interval from | |
1332 | * driver and store it in proper slot of timestamp ringbuffer. | |
1333 | */ | |
1334 | ||
1335 | /* Get current timestamp and count. */ | |
5380e929 | 1336 | vblcount = atomic_read(&dev->vblank[crtc].count); |
27641c3f MK |
1337 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); |
1338 | ||
1339 | /* Compute time difference to timestamp of last vblank */ | |
1340 | diff_ns = timeval_to_ns(&tvblank) - | |
1341 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1342 | ||
1343 | /* Update vblank timestamp and count if at least | |
1344 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1345 | * difference between last stored timestamp and current | |
1346 | * timestamp. A smaller difference means basically | |
1347 | * identical timestamps. Happens if this vblank has | |
1348 | * been already processed and this is a redundant call, | |
1349 | * e.g., due to spurious vblank interrupts. We need to | |
1350 | * ignore those for accounting. | |
1351 | */ | |
c4cc3839 | 1352 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { |
27641c3f MK |
1353 | /* Store new timestamp in ringbuffer. */ |
1354 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
27641c3f MK |
1355 | |
1356 | /* Increment cooked vblank count. This also atomically commits | |
1357 | * the timestamp computed above. | |
1358 | */ | |
bc215128 | 1359 | smp_mb__before_atomic_inc(); |
5380e929 | 1360 | atomic_inc(&dev->vblank[crtc].count); |
bc215128 | 1361 | smp_mb__after_atomic_inc(); |
27641c3f MK |
1362 | } else { |
1363 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", | |
1364 | crtc, (int) diff_ns); | |
1365 | } | |
1366 | ||
57ed0f7b | 1367 | wake_up(&dev->vblank[crtc].queue); |
c9a9c5e0 | 1368 | drm_handle_vblank_events(dev, crtc); |
27641c3f MK |
1369 | |
1370 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
78c6e170 | 1371 | return true; |
0a3e67a4 JB |
1372 | } |
1373 | EXPORT_SYMBOL(drm_handle_vblank); |