Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_irq.c |
1da177e4 LT |
3 | * IRQ support |
4 | * | |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
6 | * \author Gareth Hughes <gareth@valinux.com> | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com | |
11 | * | |
12 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
14 | * All Rights Reserved. | |
15 | * | |
16 | * Permission is hereby granted, free of charge, to any person obtaining a | |
17 | * copy of this software and associated documentation files (the "Software"), | |
18 | * to deal in the Software without restriction, including without limitation | |
19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
20 | * and/or sell copies of the Software, and to permit persons to whom the | |
21 | * Software is furnished to do so, subject to the following conditions: | |
22 | * | |
23 | * The above copyright notice and this permission notice (including the next | |
24 | * paragraph) shall be included in all copies or substantial portions of the | |
25 | * Software. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
28 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
29 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
30 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
31 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
32 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
33 | * OTHER DEALINGS IN THE SOFTWARE. | |
34 | */ | |
35 | ||
36 | #include "drmP.h" | |
ac2874b9 | 37 | #include "drm_trace.h" |
1da177e4 LT |
38 | |
39 | #include <linux/interrupt.h> /* For task queue support */ | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 | 41 | |
28d52043 | 42 | #include <linux/vgaarb.h> |
27641c3f MK |
43 | |
44 | /* Access macro for slots in vblank timestamp ringbuffer. */ | |
45 | #define vblanktimestamp(dev, crtc, count) ( \ | |
46 | (dev)->_vblank_time[(crtc) * DRM_VBLANKTIME_RBSIZE + \ | |
47 | ((count) % DRM_VBLANKTIME_RBSIZE)]) | |
48 | ||
49 | /* Retry timestamp calculation up to 3 times to satisfy | |
50 | * drm_timestamp_precision before giving up. | |
51 | */ | |
52 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
53 | ||
54 | /* Threshold in nanoseconds for detection of redundant | |
55 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
56 | */ | |
57 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
58 | ||
1da177e4 LT |
59 | /** |
60 | * Get interrupt from bus id. | |
b5e89ed5 | 61 | * |
1da177e4 | 62 | * \param inode device inode. |
6c340eac | 63 | * \param file_priv DRM file private. |
1da177e4 LT |
64 | * \param cmd command. |
65 | * \param arg user argument, pointing to a drm_irq_busid structure. | |
66 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 67 | * |
1da177e4 LT |
68 | * Finds the PCI device with the specified bus id and gets its IRQ number. |
69 | * This IOCTL is deprecated, and will now return EINVAL for any busid not equal | |
70 | * to that of the device that this DRM instance attached to. | |
71 | */ | |
c153f45f EA |
72 | int drm_irq_by_busid(struct drm_device *dev, void *data, |
73 | struct drm_file *file_priv) | |
1da177e4 | 74 | { |
c153f45f | 75 | struct drm_irq_busid *p = data; |
1da177e4 | 76 | |
dcdb1674 JC |
77 | if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE)) |
78 | return -EINVAL; | |
79 | ||
1da177e4 LT |
80 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
81 | return -EINVAL; | |
82 | ||
c153f45f EA |
83 | if ((p->busnum >> 8) != drm_get_pci_domain(dev) || |
84 | (p->busnum & 0xff) != dev->pdev->bus->number || | |
85 | p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) | |
1da177e4 LT |
86 | return -EINVAL; |
87 | ||
ed4cb414 | 88 | p->irq = dev->pdev->irq; |
c153f45f EA |
89 | |
90 | DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, | |
91 | p->irq); | |
1da177e4 | 92 | |
1da177e4 LT |
93 | return 0; |
94 | } | |
95 | ||
27641c3f MK |
96 | /* |
97 | * Clear vblank timestamp buffer for a crtc. | |
98 | */ | |
99 | static void clear_vblank_timestamps(struct drm_device *dev, int crtc) | |
100 | { | |
101 | memset(&dev->_vblank_time[crtc * DRM_VBLANKTIME_RBSIZE], 0, | |
102 | DRM_VBLANKTIME_RBSIZE * sizeof(struct timeval)); | |
103 | } | |
104 | ||
105 | /* | |
106 | * Disable vblank irq's on crtc, make sure that last vblank count | |
107 | * of hardware and corresponding consistent software vblank counter | |
108 | * are preserved, even if there are any spurious vblank irq's after | |
109 | * disable. | |
110 | */ | |
111 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
112 | { | |
113 | unsigned long irqflags; | |
114 | u32 vblcount; | |
115 | s64 diff_ns; | |
116 | int vblrc; | |
117 | struct timeval tvblank; | |
118 | ||
119 | /* Prevent vblank irq processing while disabling vblank irqs, | |
120 | * so no updates of timestamps or count can happen after we've | |
121 | * disabled. Needed to prevent races in case of delayed irq's. | |
122 | * Disable preemption, so vblank_time_lock is held as short as | |
123 | * possible, even under a kernel with PREEMPT_RT patches. | |
124 | */ | |
125 | preempt_disable(); | |
126 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
127 | ||
128 | dev->driver->disable_vblank(dev, crtc); | |
129 | dev->vblank_enabled[crtc] = 0; | |
130 | ||
131 | /* No further vblank irq's will be processed after | |
132 | * this point. Get current hardware vblank count and | |
133 | * vblank timestamp, repeat until they are consistent. | |
134 | * | |
135 | * FIXME: There is still a race condition here and in | |
136 | * drm_update_vblank_count() which can cause off-by-one | |
137 | * reinitialization of software vblank counter. If gpu | |
138 | * vblank counter doesn't increment exactly at the leading | |
139 | * edge of a vblank interval, then we can lose 1 count if | |
140 | * we happen to execute between start of vblank and the | |
141 | * delayed gpu counter increment. | |
142 | */ | |
143 | do { | |
144 | dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc); | |
145 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); | |
146 | } while (dev->last_vblank[crtc] != dev->driver->get_vblank_counter(dev, crtc)); | |
147 | ||
148 | /* Compute time difference to stored timestamp of last vblank | |
149 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
150 | */ | |
151 | vblcount = atomic_read(&dev->_vblank_count[crtc]); | |
152 | diff_ns = timeval_to_ns(&tvblank) - | |
153 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
154 | ||
155 | /* If there is at least 1 msec difference between the last stored | |
156 | * timestamp and tvblank, then we are currently executing our | |
157 | * disable inside a new vblank interval, the tvblank timestamp | |
158 | * corresponds to this new vblank interval and the irq handler | |
159 | * for this vblank didn't run yet and won't run due to our disable. | |
160 | * Therefore we need to do the job of drm_handle_vblank() and | |
161 | * increment the vblank counter by one to account for this vblank. | |
162 | * | |
163 | * Skip this step if there isn't any high precision timestamp | |
164 | * available. In that case we can't account for this and just | |
165 | * hope for the best. | |
166 | */ | |
bc215128 | 167 | if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) { |
27641c3f | 168 | atomic_inc(&dev->_vblank_count[crtc]); |
bc215128 MK |
169 | smp_mb__after_atomic_inc(); |
170 | } | |
27641c3f MK |
171 | |
172 | /* Invalidate all timestamps while vblank irq's are off. */ | |
173 | clear_vblank_timestamps(dev, crtc); | |
174 | ||
175 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
176 | preempt_enable(); | |
177 | } | |
178 | ||
0a3e67a4 JB |
179 | static void vblank_disable_fn(unsigned long arg) |
180 | { | |
181 | struct drm_device *dev = (struct drm_device *)arg; | |
182 | unsigned long irqflags; | |
183 | int i; | |
184 | ||
185 | if (!dev->vblank_disable_allowed) | |
186 | return; | |
187 | ||
188 | for (i = 0; i < dev->num_crtcs; i++) { | |
189 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
190 | if (atomic_read(&dev->vblank_refcount[i]) == 0 && | |
191 | dev->vblank_enabled[i]) { | |
192 | DRM_DEBUG("disabling vblank on crtc %d\n", i); | |
27641c3f | 193 | vblank_disable_and_save(dev, i); |
0a3e67a4 JB |
194 | } |
195 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
196 | } | |
197 | } | |
198 | ||
52440211 | 199 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 JB |
200 | { |
201 | /* Bail if the driver didn't call drm_vblank_init() */ | |
202 | if (dev->num_crtcs == 0) | |
203 | return; | |
204 | ||
205 | del_timer(&dev->vblank_disable_timer); | |
206 | ||
207 | vblank_disable_fn((unsigned long)dev); | |
208 | ||
9a298b2a EA |
209 | kfree(dev->vbl_queue); |
210 | kfree(dev->_vblank_count); | |
211 | kfree(dev->vblank_refcount); | |
212 | kfree(dev->vblank_enabled); | |
213 | kfree(dev->last_vblank); | |
214 | kfree(dev->last_vblank_wait); | |
215 | kfree(dev->vblank_inmodeset); | |
27641c3f | 216 | kfree(dev->_vblank_time); |
0a3e67a4 JB |
217 | |
218 | dev->num_crtcs = 0; | |
219 | } | |
e77cef9c | 220 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 JB |
221 | |
222 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) | |
223 | { | |
224 | int i, ret = -ENOMEM; | |
225 | ||
226 | setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, | |
227 | (unsigned long)dev); | |
228 | spin_lock_init(&dev->vbl_lock); | |
27641c3f MK |
229 | spin_lock_init(&dev->vblank_time_lock); |
230 | ||
0a3e67a4 JB |
231 | dev->num_crtcs = num_crtcs; |
232 | ||
9a298b2a EA |
233 | dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs, |
234 | GFP_KERNEL); | |
0a3e67a4 JB |
235 | if (!dev->vbl_queue) |
236 | goto err; | |
237 | ||
9a298b2a | 238 | dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL); |
0a3e67a4 JB |
239 | if (!dev->_vblank_count) |
240 | goto err; | |
241 | ||
9a298b2a EA |
242 | dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs, |
243 | GFP_KERNEL); | |
0a3e67a4 JB |
244 | if (!dev->vblank_refcount) |
245 | goto err; | |
246 | ||
9a298b2a | 247 | dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
248 | if (!dev->vblank_enabled) |
249 | goto err; | |
250 | ||
9a298b2a | 251 | dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
0a3e67a4 JB |
252 | if (!dev->last_vblank) |
253 | goto err; | |
254 | ||
9a298b2a | 255 | dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
fede5c91 EA |
256 | if (!dev->last_vblank_wait) |
257 | goto err; | |
258 | ||
9a298b2a | 259 | dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
0a3e67a4 JB |
260 | if (!dev->vblank_inmodeset) |
261 | goto err; | |
262 | ||
27641c3f MK |
263 | dev->_vblank_time = kcalloc(num_crtcs * DRM_VBLANKTIME_RBSIZE, |
264 | sizeof(struct timeval), GFP_KERNEL); | |
265 | if (!dev->_vblank_time) | |
266 | goto err; | |
267 | ||
268 | DRM_INFO("Supports vblank timestamp caching Rev 1 (10.10.2010).\n"); | |
269 | ||
270 | /* Driver specific high-precision vblank timestamping supported? */ | |
271 | if (dev->driver->get_vblank_timestamp) | |
272 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
273 | else | |
274 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
275 | ||
0a3e67a4 JB |
276 | /* Zero per-crtc vblank stuff */ |
277 | for (i = 0; i < num_crtcs; i++) { | |
278 | init_waitqueue_head(&dev->vbl_queue[i]); | |
0a3e67a4 JB |
279 | atomic_set(&dev->_vblank_count[i], 0); |
280 | atomic_set(&dev->vblank_refcount[i], 0); | |
281 | } | |
282 | ||
283 | dev->vblank_disable_allowed = 0; | |
0a3e67a4 JB |
284 | return 0; |
285 | ||
286 | err: | |
287 | drm_vblank_cleanup(dev); | |
288 | return ret; | |
289 | } | |
290 | EXPORT_SYMBOL(drm_vblank_init); | |
291 | ||
28d52043 DA |
292 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
293 | { | |
294 | struct drm_device *dev = cookie; | |
295 | ||
296 | if (dev->driver->vgaarb_irq) { | |
297 | dev->driver->vgaarb_irq(dev, state); | |
298 | return; | |
299 | } | |
300 | ||
301 | if (!dev->irq_enabled) | |
302 | return; | |
303 | ||
304 | if (state) | |
305 | dev->driver->irq_uninstall(dev); | |
306 | else { | |
307 | dev->driver->irq_preinstall(dev); | |
308 | dev->driver->irq_postinstall(dev); | |
309 | } | |
310 | } | |
311 | ||
1da177e4 LT |
312 | /** |
313 | * Install IRQ handler. | |
314 | * | |
315 | * \param dev DRM device. | |
1da177e4 | 316 | * |
0a3e67a4 | 317 | * Initializes the IRQ related data. Installs the handler, calling the driver |
1da177e4 LT |
318 | * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions |
319 | * before and after the installation. | |
320 | */ | |
0a3e67a4 | 321 | int drm_irq_install(struct drm_device *dev) |
1da177e4 | 322 | { |
0a3e67a4 | 323 | int ret = 0; |
b5e89ed5 | 324 | unsigned long sh_flags = 0; |
b8da7de5 | 325 | char *irqname; |
1da177e4 LT |
326 | |
327 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
328 | return -EINVAL; | |
329 | ||
dcdb1674 | 330 | if (drm_dev_to_irq(dev) == 0) |
1da177e4 LT |
331 | return -EINVAL; |
332 | ||
30e2fb18 | 333 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
334 | |
335 | /* Driver must have been initialized */ | |
b5e89ed5 | 336 | if (!dev->dev_private) { |
30e2fb18 | 337 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
338 | return -EINVAL; |
339 | } | |
340 | ||
b5e89ed5 | 341 | if (dev->irq_enabled) { |
30e2fb18 | 342 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
343 | return -EBUSY; |
344 | } | |
345 | dev->irq_enabled = 1; | |
30e2fb18 | 346 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 347 | |
dcdb1674 | 348 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
1da177e4 | 349 | |
b5e89ed5 | 350 | /* Before installing handler */ |
1da177e4 LT |
351 | dev->driver->irq_preinstall(dev); |
352 | ||
b5e89ed5 | 353 | /* Install handler */ |
1da177e4 | 354 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 355 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 356 | |
b8da7de5 DA |
357 | if (dev->devname) |
358 | irqname = dev->devname; | |
359 | else | |
360 | irqname = dev->driver->name; | |
361 | ||
9bfbd5cb | 362 | ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, |
b8da7de5 | 363 | sh_flags, irqname, dev); |
9bfbd5cb | 364 | |
b5e89ed5 | 365 | if (ret < 0) { |
30e2fb18 | 366 | mutex_lock(&dev->struct_mutex); |
1da177e4 | 367 | dev->irq_enabled = 0; |
30e2fb18 | 368 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
369 | return ret; |
370 | } | |
371 | ||
28d52043 DA |
372 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
373 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
374 | ||
b5e89ed5 | 375 | /* After installing handler */ |
0a3e67a4 JB |
376 | ret = dev->driver->irq_postinstall(dev); |
377 | if (ret < 0) { | |
378 | mutex_lock(&dev->struct_mutex); | |
379 | dev->irq_enabled = 0; | |
380 | mutex_unlock(&dev->struct_mutex); | |
381 | } | |
1da177e4 | 382 | |
0a3e67a4 | 383 | return ret; |
1da177e4 | 384 | } |
0a3e67a4 | 385 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
386 | |
387 | /** | |
388 | * Uninstall the IRQ handler. | |
389 | * | |
390 | * \param dev DRM device. | |
391 | * | |
392 | * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq. | |
393 | */ | |
27641c3f | 394 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 395 | { |
dc1336ff JB |
396 | unsigned long irqflags; |
397 | int irq_enabled, i; | |
1da177e4 LT |
398 | |
399 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
400 | return -EINVAL; | |
401 | ||
30e2fb18 | 402 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
403 | irq_enabled = dev->irq_enabled; |
404 | dev->irq_enabled = 0; | |
30e2fb18 | 405 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 406 | |
dc1336ff JB |
407 | /* |
408 | * Wake up any waiters so they don't hang. | |
409 | */ | |
410 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
411 | for (i = 0; i < dev->num_crtcs; i++) { | |
412 | DRM_WAKEUP(&dev->vbl_queue[i]); | |
413 | dev->vblank_enabled[i] = 0; | |
14d200c5 | 414 | dev->last_vblank[i] = dev->driver->get_vblank_counter(dev, i); |
dc1336ff JB |
415 | } |
416 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
417 | ||
b5e89ed5 | 418 | if (!irq_enabled) |
1da177e4 LT |
419 | return -EINVAL; |
420 | ||
dcdb1674 | 421 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
1da177e4 | 422 | |
28d52043 DA |
423 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
424 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
425 | ||
1da177e4 LT |
426 | dev->driver->irq_uninstall(dev); |
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 | { | |
579 | struct timeval stime, raw_time; | |
580 | struct drm_display_mode *mode; | |
581 | int vbl_status, vtotal, vdisplay; | |
582 | int vpos, hpos, i; | |
583 | s64 framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; | |
584 | bool invbl; | |
585 | ||
586 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
587 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
588 | return -EINVAL; | |
589 | } | |
590 | ||
591 | /* Scanout position query not supported? Should not happen. */ | |
592 | if (!dev->driver->get_scanout_position) { | |
593 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
594 | return -EIO; | |
595 | } | |
596 | ||
597 | mode = &refcrtc->hwmode; | |
598 | vtotal = mode->crtc_vtotal; | |
599 | vdisplay = mode->crtc_vdisplay; | |
600 | ||
601 | /* Durations of frames, lines, pixels in nanoseconds. */ | |
602 | framedur_ns = refcrtc->framedur_ns; | |
603 | linedur_ns = refcrtc->linedur_ns; | |
604 | pixeldur_ns = refcrtc->pixeldur_ns; | |
605 | ||
606 | /* If mode timing undefined, just return as no-op: | |
607 | * Happens during initial modesetting of a crtc. | |
608 | */ | |
609 | if (vtotal <= 0 || vdisplay <= 0 || framedur_ns == 0) { | |
610 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); | |
611 | return -EAGAIN; | |
612 | } | |
613 | ||
27641c3f MK |
614 | /* Get current scanout position with system timestamp. |
615 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
616 | * if single query takes longer than max_error nanoseconds. | |
617 | * | |
618 | * This guarantees a tight bound on maximum error if | |
619 | * code gets preempted or delayed for some reason. | |
620 | */ | |
621 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
622 | /* Disable preemption to make it very likely to | |
623 | * succeed in the first iteration even on PREEMPT_RT kernel. | |
624 | */ | |
625 | preempt_disable(); | |
626 | ||
627 | /* Get system timestamp before query. */ | |
628 | do_gettimeofday(&stime); | |
629 | ||
630 | /* Get vertical and horizontal scanout pos. vpos, hpos. */ | |
631 | vbl_status = dev->driver->get_scanout_position(dev, crtc, &vpos, &hpos); | |
632 | ||
633 | /* Get system timestamp after query. */ | |
634 | do_gettimeofday(&raw_time); | |
635 | ||
636 | preempt_enable(); | |
637 | ||
638 | /* Return as no-op if scanout query unsupported or failed. */ | |
639 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
640 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
641 | crtc, vbl_status); | |
642 | return -EIO; | |
643 | } | |
644 | ||
645 | duration_ns = timeval_to_ns(&raw_time) - timeval_to_ns(&stime); | |
646 | ||
647 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
648 | if (duration_ns <= (s64) *max_error) | |
649 | break; | |
650 | } | |
651 | ||
652 | /* Noisy system timing? */ | |
653 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
654 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
655 | crtc, (int) duration_ns/1000, *max_error/1000, i); | |
656 | } | |
657 | ||
658 | /* Return upper bound of timestamp precision error. */ | |
659 | *max_error = (int) duration_ns; | |
660 | ||
661 | /* Check if in vblank area: | |
662 | * vpos is >=0 in video scanout area, but negative | |
663 | * within vblank area, counting down the number of lines until | |
664 | * start of scanout. | |
665 | */ | |
666 | invbl = vbl_status & DRM_SCANOUTPOS_INVBL; | |
667 | ||
668 | /* Convert scanout position into elapsed time at raw_time query | |
669 | * since start of scanout at first display scanline. delta_ns | |
670 | * can be negative if start of scanout hasn't happened yet. | |
671 | */ | |
672 | delta_ns = (s64) vpos * linedur_ns + (s64) hpos * pixeldur_ns; | |
673 | ||
674 | /* Is vpos outside nominal vblank area, but less than | |
675 | * 1/100 of a frame height away from start of vblank? | |
676 | * If so, assume this isn't a massively delayed vblank | |
677 | * interrupt, but a vblank interrupt that fired a few | |
678 | * microseconds before true start of vblank. Compensate | |
679 | * by adding a full frame duration to the final timestamp. | |
680 | * Happens, e.g., on ATI R500, R600. | |
681 | * | |
682 | * We only do this if DRM_CALLED_FROM_VBLIRQ. | |
683 | */ | |
684 | if ((flags & DRM_CALLED_FROM_VBLIRQ) && !invbl && | |
685 | ((vdisplay - vpos) < vtotal / 100)) { | |
686 | delta_ns = delta_ns - framedur_ns; | |
687 | ||
688 | /* Signal this correction as "applied". */ | |
689 | vbl_status |= 0x8; | |
690 | } | |
691 | ||
692 | /* Subtract time delta from raw timestamp to get final | |
693 | * vblank_time timestamp for end of vblank. | |
694 | */ | |
695 | *vblank_time = ns_to_timeval(timeval_to_ns(&raw_time) - delta_ns); | |
696 | ||
697 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %d.%d -> %d.%d [e %d us, %d rep]\n", | |
698 | crtc, (int) vbl_status, hpos, vpos, raw_time.tv_sec, | |
699 | raw_time.tv_usec, vblank_time->tv_sec, vblank_time->tv_usec, | |
700 | (int) duration_ns/1000, i); | |
701 | ||
702 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
703 | if (invbl) | |
704 | vbl_status |= DRM_VBLANKTIME_INVBL; | |
705 | ||
706 | return vbl_status; | |
707 | } | |
708 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
709 | ||
710 | /** | |
711 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
712 | * vblank interval. | |
713 | * | |
714 | * @dev: DRM device | |
715 | * @crtc: which crtc's vblank timestamp to retrieve | |
716 | * @tvblank: Pointer to target struct timeval which should receive the timestamp | |
717 | * @flags: Flags to pass to driver: | |
718 | * 0 = Default. | |
719 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. | |
720 | * | |
721 | * Fetches the system timestamp corresponding to the time of the most recent | |
722 | * vblank interval on specified crtc. May call into kms-driver to | |
723 | * compute the timestamp with a high-precision GPU specific method. | |
724 | * | |
725 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
726 | * call, i.e., it isn't very precisely locked to the true vblank. | |
727 | * | |
728 | * Returns non-zero if timestamp is considered to be very precise. | |
729 | */ | |
730 | u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
731 | struct timeval *tvblank, unsigned flags) | |
732 | { | |
733 | int ret = 0; | |
734 | ||
735 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
736 | int max_error = (int) drm_timestamp_precision * 1000; | |
737 | ||
738 | /* Query driver if possible and precision timestamping enabled. */ | |
739 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
740 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
741 | tvblank, flags); | |
742 | if (ret > 0) | |
743 | return (u32) ret; | |
744 | } | |
745 | ||
746 | /* GPU high precision timestamp query unsupported or failed. | |
747 | * Return gettimeofday timestamp as best estimate. | |
748 | */ | |
749 | do_gettimeofday(tvblank); | |
750 | ||
751 | return 0; | |
752 | } | |
753 | EXPORT_SYMBOL(drm_get_last_vbltimestamp); | |
754 | ||
0a3e67a4 JB |
755 | /** |
756 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
757 | * @dev: DRM device | |
758 | * @crtc: which counter to retrieve | |
759 | * | |
760 | * Fetches the "cooked" vblank count value that represents the number of | |
761 | * vblank events since the system was booted, including lost events due to | |
762 | * modesetting activity. | |
763 | */ | |
764 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
765 | { | |
766 | return atomic_read(&dev->_vblank_count[crtc]); | |
767 | } | |
768 | EXPORT_SYMBOL(drm_vblank_count); | |
769 | ||
27641c3f MK |
770 | /** |
771 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
772 | * and the system timestamp corresponding to that vblank counter value. | |
773 | * | |
774 | * @dev: DRM device | |
775 | * @crtc: which counter to retrieve | |
776 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
777 | * | |
778 | * Fetches the "cooked" vblank count value that represents the number of | |
779 | * vblank events since the system was booted, including lost events due to | |
780 | * modesetting activity. Returns corresponding system timestamp of the time | |
781 | * of the vblank interval that corresponds to the current value vblank counter | |
782 | * value. | |
783 | */ | |
784 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
785 | struct timeval *vblanktime) | |
786 | { | |
787 | u32 cur_vblank; | |
788 | ||
789 | /* Read timestamp from slot of _vblank_time ringbuffer | |
790 | * that corresponds to current vblank count. Retry if | |
791 | * count has incremented during readout. This works like | |
792 | * a seqlock. | |
793 | */ | |
794 | do { | |
795 | cur_vblank = atomic_read(&dev->_vblank_count[crtc]); | |
796 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); | |
797 | smp_rmb(); | |
798 | } while (cur_vblank != atomic_read(&dev->_vblank_count[crtc])); | |
799 | ||
800 | return cur_vblank; | |
801 | } | |
802 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
803 | ||
0a3e67a4 JB |
804 | /** |
805 | * drm_update_vblank_count - update the master vblank counter | |
806 | * @dev: DRM device | |
807 | * @crtc: counter to update | |
808 | * | |
809 | * Call back into the driver to update the appropriate vblank counter | |
810 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
811 | * update the last read value so we can deal with wraparound on the next | |
812 | * call if necessary. | |
813 | * | |
814 | * Only necessary when going from off->on, to account for frames we | |
815 | * didn't get an interrupt for. | |
816 | * | |
817 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
818 | * device vblank fields. | |
819 | */ | |
820 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
821 | { | |
27641c3f MK |
822 | u32 cur_vblank, diff, tslot, rc; |
823 | struct timeval t_vblank; | |
0a3e67a4 JB |
824 | |
825 | /* | |
826 | * Interrupts were disabled prior to this call, so deal with counter | |
827 | * wrap if needed. | |
828 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
829 | * here if the register is small or we had vblank interrupts off for | |
830 | * a long time. | |
27641c3f MK |
831 | * |
832 | * We repeat the hardware vblank counter & timestamp query until | |
833 | * we get consistent results. This to prevent races between gpu | |
834 | * updating its hardware counter while we are retrieving the | |
835 | * corresponding vblank timestamp. | |
0a3e67a4 | 836 | */ |
27641c3f MK |
837 | do { |
838 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
839 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
840 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
841 | ||
842 | /* Deal with counter wrap */ | |
0a3e67a4 JB |
843 | diff = cur_vblank - dev->last_vblank[crtc]; |
844 | if (cur_vblank < dev->last_vblank[crtc]) { | |
845 | diff += dev->max_vblank_count; | |
846 | ||
847 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
848 | crtc, dev->last_vblank[crtc], cur_vblank, diff); | |
849 | } | |
850 | ||
851 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", | |
852 | crtc, diff); | |
853 | ||
27641c3f MK |
854 | /* Reinitialize corresponding vblank timestamp if high-precision query |
855 | * available. Skip this step if query unsupported or failed. Will | |
856 | * reinitialize delayed at next vblank interrupt in that case. | |
857 | */ | |
858 | if (rc) { | |
859 | tslot = atomic_read(&dev->_vblank_count[crtc]) + diff; | |
860 | vblanktimestamp(dev, crtc, tslot) = t_vblank; | |
27641c3f MK |
861 | } |
862 | ||
bc215128 | 863 | smp_mb__before_atomic_inc(); |
0a3e67a4 | 864 | atomic_add(diff, &dev->_vblank_count[crtc]); |
bc215128 | 865 | smp_mb__after_atomic_inc(); |
0a3e67a4 JB |
866 | } |
867 | ||
868 | /** | |
869 | * drm_vblank_get - get a reference count on vblank events | |
870 | * @dev: DRM device | |
871 | * @crtc: which CRTC to own | |
872 | * | |
873 | * Acquire a reference count on vblank events to avoid having them disabled | |
874 | * while in use. | |
875 | * | |
876 | * RETURNS | |
877 | * Zero on success, nonzero on failure. | |
878 | */ | |
879 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
880 | { | |
27641c3f | 881 | unsigned long irqflags, irqflags2; |
0a3e67a4 JB |
882 | int ret = 0; |
883 | ||
884 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
885 | /* Going from 0->1 means we have to enable interrupts again */ | |
778c9026 | 886 | if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) { |
27641c3f MK |
887 | /* Disable preemption while holding vblank_time_lock. Do |
888 | * it explicitely to guard against PREEMPT_RT kernel. | |
889 | */ | |
890 | preempt_disable(); | |
891 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags2); | |
778c9026 | 892 | if (!dev->vblank_enabled[crtc]) { |
27641c3f MK |
893 | /* Enable vblank irqs under vblank_time_lock protection. |
894 | * All vblank count & timestamp updates are held off | |
895 | * until we are done reinitializing master counter and | |
896 | * timestamps. Filtercode in drm_handle_vblank() will | |
897 | * prevent double-accounting of same vblank interval. | |
898 | */ | |
778c9026 | 899 | ret = dev->driver->enable_vblank(dev, crtc); |
27641c3f MK |
900 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", |
901 | crtc, ret); | |
778c9026 LP |
902 | if (ret) |
903 | atomic_dec(&dev->vblank_refcount[crtc]); | |
904 | else { | |
905 | dev->vblank_enabled[crtc] = 1; | |
906 | drm_update_vblank_count(dev, crtc); | |
907 | } | |
908 | } | |
27641c3f MK |
909 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2); |
910 | preempt_enable(); | |
778c9026 LP |
911 | } else { |
912 | if (!dev->vblank_enabled[crtc]) { | |
0a3e67a4 | 913 | atomic_dec(&dev->vblank_refcount[crtc]); |
778c9026 | 914 | ret = -EINVAL; |
0a3e67a4 JB |
915 | } |
916 | } | |
917 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
918 | ||
919 | return ret; | |
920 | } | |
921 | EXPORT_SYMBOL(drm_vblank_get); | |
922 | ||
923 | /** | |
924 | * drm_vblank_put - give up ownership of vblank events | |
925 | * @dev: DRM device | |
926 | * @crtc: which counter to give up | |
927 | * | |
928 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 929 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
0a3e67a4 JB |
930 | */ |
931 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
932 | { | |
27641c3f | 933 | BUG_ON(atomic_read(&dev->vblank_refcount[crtc]) == 0); |
b3f5e732 | 934 | |
0a3e67a4 | 935 | /* Last user schedules interrupt disable */ |
27641c3f MK |
936 | if (atomic_dec_and_test(&dev->vblank_refcount[crtc]) && |
937 | (drm_vblank_offdelay > 0)) | |
938 | mod_timer(&dev->vblank_disable_timer, | |
939 | jiffies + ((drm_vblank_offdelay * DRM_HZ)/1000)); | |
0a3e67a4 JB |
940 | } |
941 | EXPORT_SYMBOL(drm_vblank_put); | |
942 | ||
778c9026 LP |
943 | void drm_vblank_off(struct drm_device *dev, int crtc) |
944 | { | |
945 | unsigned long irqflags; | |
946 | ||
947 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
27641c3f | 948 | vblank_disable_and_save(dev, crtc); |
778c9026 | 949 | DRM_WAKEUP(&dev->vbl_queue[crtc]); |
778c9026 LP |
950 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
951 | } | |
952 | EXPORT_SYMBOL(drm_vblank_off); | |
953 | ||
f453ba04 DA |
954 | /** |
955 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
956 | * @dev: DRM device | |
957 | * @crtc: CRTC in question | |
958 | * @post: post or pre mode set? | |
959 | * | |
960 | * Account for vblank events across mode setting events, which will likely | |
961 | * reset the hardware frame counter. | |
962 | */ | |
963 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
964 | { | |
e77cef9c JG |
965 | /* vblank is not initialized (IRQ not installed ?) */ |
966 | if (!dev->num_crtcs) | |
967 | return; | |
f453ba04 DA |
968 | /* |
969 | * To avoid all the problems that might happen if interrupts | |
970 | * were enabled/disabled around or between these calls, we just | |
971 | * have the kernel take a reference on the CRTC (just once though | |
972 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
973 | * so that interrupts remain enabled in the interim. | |
974 | */ | |
975 | if (!dev->vblank_inmodeset[crtc]) { | |
b3f5e732 CW |
976 | dev->vblank_inmodeset[crtc] = 0x1; |
977 | if (drm_vblank_get(dev, crtc) == 0) | |
978 | dev->vblank_inmodeset[crtc] |= 0x2; | |
f453ba04 DA |
979 | } |
980 | } | |
981 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
982 | ||
983 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) | |
984 | { | |
985 | unsigned long irqflags; | |
986 | ||
987 | if (dev->vblank_inmodeset[crtc]) { | |
988 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
989 | dev->vblank_disable_allowed = 1; | |
f453ba04 | 990 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 CW |
991 | |
992 | if (dev->vblank_inmodeset[crtc] & 0x2) | |
993 | drm_vblank_put(dev, crtc); | |
994 | ||
995 | dev->vblank_inmodeset[crtc] = 0; | |
f453ba04 DA |
996 | } |
997 | } | |
998 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
999 | ||
0a3e67a4 JB |
1000 | /** |
1001 | * drm_modeset_ctl - handle vblank event counter changes across mode switch | |
1002 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1003 | * | |
1004 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1005 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1006 | * | |
1007 | * Generally the counter will reset across mode sets. If interrupts are | |
1008 | * enabled around this call, we don't have to do anything since the counter | |
1009 | * will have already been incremented. | |
1010 | */ | |
1011 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1012 | struct drm_file *file_priv) | |
1013 | { | |
1014 | struct drm_modeset_ctl *modeset = data; | |
0a3e67a4 JB |
1015 | int crtc, ret = 0; |
1016 | ||
1017 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1018 | if (!dev->num_crtcs) | |
1019 | goto out; | |
1020 | ||
1021 | crtc = modeset->crtc; | |
1022 | if (crtc >= dev->num_crtcs) { | |
1023 | ret = -EINVAL; | |
1024 | goto out; | |
1025 | } | |
1026 | ||
0a3e67a4 JB |
1027 | switch (modeset->cmd) { |
1028 | case _DRM_PRE_MODESET: | |
f453ba04 | 1029 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1030 | break; |
1031 | case _DRM_POST_MODESET: | |
f453ba04 | 1032 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1033 | break; |
1034 | default: | |
1035 | ret = -EINVAL; | |
1036 | break; | |
1037 | } | |
1038 | ||
1039 | out: | |
1040 | return ret; | |
1041 | } | |
1042 | ||
c9a9c5e0 KH |
1043 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1044 | union drm_wait_vblank *vblwait, | |
1045 | struct drm_file *file_priv) | |
1046 | { | |
1047 | struct drm_pending_vblank_event *e; | |
1048 | struct timeval now; | |
1049 | unsigned long flags; | |
1050 | unsigned int seq; | |
ea5d552c | 1051 | int ret; |
c9a9c5e0 KH |
1052 | |
1053 | e = kzalloc(sizeof *e, GFP_KERNEL); | |
ea5d552c CW |
1054 | if (e == NULL) { |
1055 | ret = -ENOMEM; | |
1056 | goto err_put; | |
1057 | } | |
c9a9c5e0 KH |
1058 | |
1059 | e->pipe = pipe; | |
b9c2c9ae | 1060 | e->base.pid = current->pid; |
c9a9c5e0 KH |
1061 | e->event.base.type = DRM_EVENT_VBLANK; |
1062 | e->event.base.length = sizeof e->event; | |
1063 | e->event.user_data = vblwait->request.signal; | |
1064 | e->base.event = &e->event.base; | |
1065 | e->base.file_priv = file_priv; | |
1066 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1067 | ||
c9a9c5e0 KH |
1068 | spin_lock_irqsave(&dev->event_lock, flags); |
1069 | ||
1070 | if (file_priv->event_space < sizeof e->event) { | |
ea5d552c CW |
1071 | ret = -EBUSY; |
1072 | goto err_unlock; | |
c9a9c5e0 KH |
1073 | } |
1074 | ||
1075 | file_priv->event_space -= sizeof e->event; | |
27641c3f MK |
1076 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1077 | ||
c9a9c5e0 KH |
1078 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1079 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1080 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1081 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1082 | } |
1083 | ||
1084 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1085 | vblwait->request.sequence, seq, pipe); | |
1086 | ||
b9c2c9ae JB |
1087 | trace_drm_vblank_event_queued(current->pid, pipe, |
1088 | vblwait->request.sequence); | |
1089 | ||
c9a9c5e0 KH |
1090 | e->event.sequence = vblwait->request.sequence; |
1091 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
000fa7cf | 1092 | e->event.sequence = seq; |
c9a9c5e0 KH |
1093 | e->event.tv_sec = now.tv_sec; |
1094 | e->event.tv_usec = now.tv_usec; | |
6f331623 | 1095 | drm_vblank_put(dev, pipe); |
c9a9c5e0 KH |
1096 | list_add_tail(&e->base.link, &e->base.file_priv->event_list); |
1097 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
000fa7cf | 1098 | vblwait->reply.sequence = seq; |
b9c2c9ae JB |
1099 | trace_drm_vblank_event_delivered(current->pid, pipe, |
1100 | vblwait->request.sequence); | |
c9a9c5e0 KH |
1101 | } else { |
1102 | list_add_tail(&e->base.link, &dev->vblank_event_list); | |
000fa7cf | 1103 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1104 | } |
1105 | ||
1106 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1107 | ||
1108 | return 0; | |
ea5d552c CW |
1109 | |
1110 | err_unlock: | |
1111 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1112 | kfree(e); | |
1113 | err_put: | |
6f331623 | 1114 | drm_vblank_put(dev, pipe); |
ea5d552c | 1115 | return ret; |
c9a9c5e0 KH |
1116 | } |
1117 | ||
1da177e4 LT |
1118 | /** |
1119 | * Wait for VBLANK. | |
1120 | * | |
1121 | * \param inode device inode. | |
6c340eac | 1122 | * \param file_priv DRM file private. |
1da177e4 LT |
1123 | * \param cmd command. |
1124 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1125 | * \return zero on success or a negative number on failure. | |
1126 | * | |
30b23634 EA |
1127 | * This function enables the vblank interrupt on the pipe requested, then |
1128 | * sleeps waiting for the requested sequence number to occur, and drops | |
1129 | * the vblank interrupt refcount afterwards. (vblank irq disable follows that | |
1130 | * after a timeout with no further vblank waits scheduled). | |
1da177e4 | 1131 | */ |
0a3e67a4 JB |
1132 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1133 | struct drm_file *file_priv) | |
1da177e4 | 1134 | { |
c153f45f | 1135 | union drm_wait_vblank *vblwait = data; |
1da177e4 | 1136 | int ret = 0; |
0a3e67a4 | 1137 | unsigned int flags, seq, crtc; |
1da177e4 | 1138 | |
dcdb1674 | 1139 | if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled)) |
1da177e4 LT |
1140 | return -EINVAL; |
1141 | ||
30b23634 EA |
1142 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1143 | return -EINVAL; | |
1144 | ||
c153f45f | 1145 | if (vblwait->request.type & |
776c9443 MCA |
1146 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) { |
1147 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", | |
c153f45f | 1148 | vblwait->request.type, |
776c9443 MCA |
1149 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)); |
1150 | return -EINVAL; | |
1151 | } | |
1152 | ||
c153f45f | 1153 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
0a3e67a4 | 1154 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
776c9443 | 1155 | |
0a3e67a4 | 1156 | if (crtc >= dev->num_crtcs) |
776c9443 MCA |
1157 | return -EINVAL; |
1158 | ||
0a3e67a4 JB |
1159 | ret = drm_vblank_get(dev, crtc); |
1160 | if (ret) { | |
8d3457ec | 1161 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1162 | return ret; |
1163 | } | |
1164 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1165 | |
c153f45f | 1166 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1167 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1168 | vblwait->request.sequence += seq; |
1169 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1170 | case _DRM_VBLANK_ABSOLUTE: |
1171 | break; | |
1172 | default: | |
0a3e67a4 JB |
1173 | ret = -EINVAL; |
1174 | goto done; | |
1da177e4 LT |
1175 | } |
1176 | ||
c9a9c5e0 KH |
1177 | if (flags & _DRM_VBLANK_EVENT) |
1178 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); | |
1179 | ||
ab285d74 | 1180 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1181 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1182 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
1183 | } |
1184 | ||
30b23634 EA |
1185 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1186 | vblwait->request.sequence, crtc); | |
1187 | dev->last_vblank_wait[crtc] = vblwait->request.sequence; | |
1188 | DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ, | |
1189 | (((drm_vblank_count(dev, crtc) - | |
1190 | vblwait->request.sequence) <= (1 << 23)) || | |
1191 | !dev->irq_enabled)); | |
1da177e4 | 1192 | |
30b23634 EA |
1193 | if (ret != -EINTR) { |
1194 | struct timeval now; | |
1da177e4 | 1195 | |
27641c3f | 1196 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1197 | vblwait->reply.tval_sec = now.tv_sec; |
1198 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1199 | |
30b23634 EA |
1200 | DRM_DEBUG("returning %d to client\n", |
1201 | vblwait->reply.sequence); | |
1da177e4 | 1202 | } else { |
30b23634 | 1203 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1204 | } |
1205 | ||
0a3e67a4 JB |
1206 | done: |
1207 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1208 | return ret; |
1209 | } | |
1210 | ||
c9a9c5e0 KH |
1211 | void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
1212 | { | |
1213 | struct drm_pending_vblank_event *e, *t; | |
1214 | struct timeval now; | |
1215 | unsigned long flags; | |
1216 | unsigned int seq; | |
1217 | ||
27641c3f | 1218 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1219 | |
1220 | spin_lock_irqsave(&dev->event_lock, flags); | |
1221 | ||
1222 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1223 | if (e->pipe != crtc) | |
1224 | continue; | |
1225 | if ((seq - e->event.sequence) > (1<<23)) | |
1226 | continue; | |
1227 | ||
1228 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1229 | e->event.sequence, seq); | |
1230 | ||
1231 | e->event.sequence = seq; | |
1232 | e->event.tv_sec = now.tv_sec; | |
1233 | e->event.tv_usec = now.tv_usec; | |
1234 | drm_vblank_put(dev, e->pipe); | |
1235 | list_move_tail(&e->base.link, &e->base.file_priv->event_list); | |
1236 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
b9c2c9ae JB |
1237 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, |
1238 | e->event.sequence); | |
c9a9c5e0 KH |
1239 | } |
1240 | ||
1241 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
ac2874b9 JB |
1242 | |
1243 | trace_drm_vblank_event(crtc, seq); | |
c9a9c5e0 KH |
1244 | } |
1245 | ||
0a3e67a4 JB |
1246 | /** |
1247 | * drm_handle_vblank - handle a vblank event | |
1248 | * @dev: DRM device | |
1249 | * @crtc: where this event occurred | |
1250 | * | |
1251 | * Drivers should call this routine in their vblank interrupt handlers to | |
1252 | * update the vblank counter and send any signals that may be pending. | |
1253 | */ | |
78c6e170 | 1254 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1255 | { |
27641c3f MK |
1256 | u32 vblcount; |
1257 | s64 diff_ns; | |
1258 | struct timeval tvblank; | |
1259 | unsigned long irqflags; | |
1260 | ||
c9a9c5e0 | 1261 | if (!dev->num_crtcs) |
78c6e170 | 1262 | return false; |
c9a9c5e0 | 1263 | |
27641c3f MK |
1264 | /* Need timestamp lock to prevent concurrent execution with |
1265 | * vblank enable/disable, as this would cause inconsistent | |
1266 | * or corrupted timestamps and vblank counts. | |
1267 | */ | |
1268 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
1269 | ||
1270 | /* Vblank irq handling disabled. Nothing to do. */ | |
1271 | if (!dev->vblank_enabled[crtc]) { | |
1272 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
78c6e170 | 1273 | return false; |
27641c3f MK |
1274 | } |
1275 | ||
1276 | /* Fetch corresponding timestamp for this vblank interval from | |
1277 | * driver and store it in proper slot of timestamp ringbuffer. | |
1278 | */ | |
1279 | ||
1280 | /* Get current timestamp and count. */ | |
1281 | vblcount = atomic_read(&dev->_vblank_count[crtc]); | |
1282 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); | |
1283 | ||
1284 | /* Compute time difference to timestamp of last vblank */ | |
1285 | diff_ns = timeval_to_ns(&tvblank) - | |
1286 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1287 | ||
1288 | /* Update vblank timestamp and count if at least | |
1289 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1290 | * difference between last stored timestamp and current | |
1291 | * timestamp. A smaller difference means basically | |
1292 | * identical timestamps. Happens if this vblank has | |
1293 | * been already processed and this is a redundant call, | |
1294 | * e.g., due to spurious vblank interrupts. We need to | |
1295 | * ignore those for accounting. | |
1296 | */ | |
c4cc3839 | 1297 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { |
27641c3f MK |
1298 | /* Store new timestamp in ringbuffer. */ |
1299 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
27641c3f MK |
1300 | |
1301 | /* Increment cooked vblank count. This also atomically commits | |
1302 | * the timestamp computed above. | |
1303 | */ | |
bc215128 | 1304 | smp_mb__before_atomic_inc(); |
27641c3f | 1305 | atomic_inc(&dev->_vblank_count[crtc]); |
bc215128 | 1306 | smp_mb__after_atomic_inc(); |
27641c3f MK |
1307 | } else { |
1308 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", | |
1309 | crtc, (int) diff_ns); | |
1310 | } | |
1311 | ||
0a3e67a4 | 1312 | DRM_WAKEUP(&dev->vbl_queue[crtc]); |
c9a9c5e0 | 1313 | drm_handle_vblank_events(dev, crtc); |
27641c3f MK |
1314 | |
1315 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
78c6e170 | 1316 | return true; |
0a3e67a4 JB |
1317 | } |
1318 | EXPORT_SYMBOL(drm_handle_vblank); |