Commit | Line | Data |
---|---|---|
f5752b38 DV |
1 | /* |
2 | * drm_irq.c IRQ and vblank support | |
1da177e4 LT |
3 | * |
4 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
5 | * \author Gareth Hughes <gareth@valinux.com> | |
6 | */ | |
7 | ||
8 | /* | |
9 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com | |
10 | * | |
11 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
12 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
13 | * All Rights Reserved. | |
14 | * | |
15 | * Permission is hereby granted, free of charge, to any person obtaining a | |
16 | * copy of this software and associated documentation files (the "Software"), | |
17 | * to deal in the Software without restriction, including without limitation | |
18 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
19 | * and/or sell copies of the Software, and to permit persons to whom the | |
20 | * Software is furnished to do so, subject to the following conditions: | |
21 | * | |
22 | * The above copyright notice and this permission notice (including the next | |
23 | * paragraph) shall be included in all copies or substantial portions of the | |
24 | * Software. | |
25 | * | |
26 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
27 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
28 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
29 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
30 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
31 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
32 | * OTHER DEALINGS IN THE SOFTWARE. | |
33 | */ | |
34 | ||
760285e7 | 35 | #include <drm/drmP.h> |
ac2874b9 | 36 | #include "drm_trace.h" |
18882995 | 37 | #include "drm_internal.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 | ||
fb446a1a DV |
59 | static bool |
60 | drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
61 | struct timeval *tvblank, unsigned flags); | |
62 | ||
18882995 DV |
63 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ |
64 | ||
65 | /* | |
66 | * Default to use monotonic timestamps for wait-for-vblank and page-flip | |
67 | * complete events. | |
68 | */ | |
69 | unsigned int drm_timestamp_monotonic = 1; | |
70 | ||
71 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ | |
72 | ||
73 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); | |
74 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); | |
75 | module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600); | |
76 | ||
13b030af VS |
77 | /** |
78 | * drm_update_vblank_count - update the master vblank counter | |
79 | * @dev: DRM device | |
80 | * @crtc: counter to update | |
81 | * | |
82 | * Call back into the driver to update the appropriate vblank counter | |
83 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
84 | * update the last read value so we can deal with wraparound on the next | |
85 | * call if necessary. | |
86 | * | |
87 | * Only necessary when going from off->on, to account for frames we | |
88 | * didn't get an interrupt for. | |
89 | * | |
90 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
91 | * device vblank fields. | |
92 | */ | |
93 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
94 | { | |
8a51d5be | 95 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
fb446a1a DV |
96 | u32 cur_vblank, diff, tslot; |
97 | bool rc; | |
13b030af VS |
98 | struct timeval t_vblank; |
99 | ||
100 | /* | |
101 | * Interrupts were disabled prior to this call, so deal with counter | |
102 | * wrap if needed. | |
103 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
104 | * here if the register is small or we had vblank interrupts off for | |
105 | * a long time. | |
106 | * | |
107 | * We repeat the hardware vblank counter & timestamp query until | |
108 | * we get consistent results. This to prevent races between gpu | |
109 | * updating its hardware counter while we are retrieving the | |
110 | * corresponding vblank timestamp. | |
111 | */ | |
112 | do { | |
113 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
114 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
115 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
116 | ||
117 | /* Deal with counter wrap */ | |
8a51d5be VS |
118 | diff = cur_vblank - vblank->last; |
119 | if (cur_vblank < vblank->last) { | |
13b030af VS |
120 | diff += dev->max_vblank_count; |
121 | ||
122 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
8a51d5be | 123 | crtc, vblank->last, cur_vblank, diff); |
13b030af VS |
124 | } |
125 | ||
96a9fdd7 | 126 | DRM_DEBUG("updating vblank count on crtc %d, missed %d\n", |
13b030af VS |
127 | crtc, diff); |
128 | ||
da8f4396 MK |
129 | if (diff == 0) |
130 | return; | |
131 | ||
13b030af VS |
132 | /* Reinitialize corresponding vblank timestamp if high-precision query |
133 | * available. Skip this step if query unsupported or failed. Will | |
134 | * reinitialize delayed at next vblank interrupt in that case. | |
135 | */ | |
136 | if (rc) { | |
8a51d5be | 137 | tslot = atomic_read(&vblank->count) + diff; |
13b030af VS |
138 | vblanktimestamp(dev, crtc, tslot) = t_vblank; |
139 | } | |
140 | ||
141 | smp_mb__before_atomic(); | |
8a51d5be | 142 | atomic_add(diff, &vblank->count); |
13b030af VS |
143 | smp_mb__after_atomic(); |
144 | } | |
145 | ||
27641c3f MK |
146 | /* |
147 | * Disable vblank irq's on crtc, make sure that last vblank count | |
148 | * of hardware and corresponding consistent software vblank counter | |
149 | * are preserved, even if there are any spurious vblank irq's after | |
150 | * disable. | |
151 | */ | |
152 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
153 | { | |
8a51d5be | 154 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
155 | unsigned long irqflags; |
156 | u32 vblcount; | |
157 | s64 diff_ns; | |
fb446a1a | 158 | bool vblrc; |
27641c3f | 159 | struct timeval tvblank; |
0355cf3a | 160 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
161 | |
162 | /* Prevent vblank irq processing while disabling vblank irqs, | |
163 | * so no updates of timestamps or count can happen after we've | |
164 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 165 | */ |
27641c3f MK |
166 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
167 | ||
812e7465 | 168 | /* |
393e872e | 169 | * If the vblank interrupt was already disabled update the count |
812e7465 VS |
170 | * and timestamp to maintain the appearance that the counter |
171 | * has been ticking all along until this time. This makes the | |
172 | * count account for the entire time between drm_vblank_on() and | |
173 | * drm_vblank_off(). | |
855d30b4 DV |
174 | * |
175 | * But only do this if precise vblank timestamps are available. | |
176 | * Otherwise we might read a totally bogus timestamp since drivers | |
177 | * lacking precise timestamp support rely upon sampling the system clock | |
178 | * at vblank interrupt time. Which obviously won't work out well if the | |
179 | * vblank interrupt is disabled. | |
812e7465 | 180 | */ |
855d30b4 | 181 | if (!vblank->enabled && |
fb446a1a | 182 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0)) { |
812e7465 VS |
183 | drm_update_vblank_count(dev, crtc); |
184 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
185 | return; | |
186 | } | |
187 | ||
eb2ed66f LP |
188 | /* |
189 | * Only disable vblank interrupts if they're enabled. This avoids | |
190 | * calling the ->disable_vblank() operation in atomic context with the | |
191 | * hardware potentially runtime suspended. | |
192 | */ | |
193 | if (vblank->enabled) { | |
194 | dev->driver->disable_vblank(dev, crtc); | |
195 | vblank->enabled = false; | |
196 | } | |
27641c3f MK |
197 | |
198 | /* No further vblank irq's will be processed after | |
199 | * this point. Get current hardware vblank count and | |
200 | * vblank timestamp, repeat until they are consistent. | |
201 | * | |
202 | * FIXME: There is still a race condition here and in | |
203 | * drm_update_vblank_count() which can cause off-by-one | |
204 | * reinitialization of software vblank counter. If gpu | |
205 | * vblank counter doesn't increment exactly at the leading | |
206 | * edge of a vblank interval, then we can lose 1 count if | |
207 | * we happen to execute between start of vblank and the | |
208 | * delayed gpu counter increment. | |
209 | */ | |
210 | do { | |
8a51d5be | 211 | vblank->last = dev->driver->get_vblank_counter(dev, crtc); |
27641c3f | 212 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); |
8a51d5be | 213 | } while (vblank->last != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc); |
0355cf3a EE |
214 | |
215 | if (!count) | |
216 | vblrc = 0; | |
27641c3f MK |
217 | |
218 | /* Compute time difference to stored timestamp of last vblank | |
219 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
220 | */ | |
8a51d5be | 221 | vblcount = atomic_read(&vblank->count); |
27641c3f MK |
222 | diff_ns = timeval_to_ns(&tvblank) - |
223 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
224 | ||
225 | /* If there is at least 1 msec difference between the last stored | |
226 | * timestamp and tvblank, then we are currently executing our | |
227 | * disable inside a new vblank interval, the tvblank timestamp | |
228 | * corresponds to this new vblank interval and the irq handler | |
229 | * for this vblank didn't run yet and won't run due to our disable. | |
230 | * Therefore we need to do the job of drm_handle_vblank() and | |
231 | * increment the vblank counter by one to account for this vblank. | |
232 | * | |
233 | * Skip this step if there isn't any high precision timestamp | |
234 | * available. In that case we can't account for this and just | |
235 | * hope for the best. | |
236 | */ | |
fb446a1a | 237 | if (vblrc && (abs64(diff_ns) > 1000000)) { |
c50d7521 VS |
238 | /* Store new timestamp in ringbuffer. */ |
239 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
240 | ||
241 | /* Increment cooked vblank count. This also atomically commits | |
242 | * the timestamp computed above. | |
243 | */ | |
244 | smp_mb__before_atomic(); | |
8a51d5be | 245 | atomic_inc(&vblank->count); |
4e857c58 | 246 | smp_mb__after_atomic(); |
bc215128 | 247 | } |
27641c3f | 248 | |
27641c3f | 249 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
250 | } |
251 | ||
0a3e67a4 JB |
252 | static void vblank_disable_fn(unsigned long arg) |
253 | { | |
e69595c2 VS |
254 | struct drm_vblank_crtc *vblank = (void *)arg; |
255 | struct drm_device *dev = vblank->dev; | |
0a3e67a4 | 256 | unsigned long irqflags; |
e69595c2 | 257 | int crtc = vblank->crtc; |
0a3e67a4 JB |
258 | |
259 | if (!dev->vblank_disable_allowed) | |
260 | return; | |
261 | ||
e69595c2 VS |
262 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
263 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
264 | DRM_DEBUG("disabling vblank on crtc %d\n", crtc); | |
265 | vblank_disable_and_save(dev, crtc); | |
0a3e67a4 | 266 | } |
e69595c2 | 267 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
268 | } |
269 | ||
f5752b38 DV |
270 | /** |
271 | * drm_vblank_cleanup - cleanup vblank support | |
272 | * @dev: DRM device | |
273 | * | |
274 | * This function cleans up any resources allocated in drm_vblank_init. | |
275 | */ | |
52440211 | 276 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 277 | { |
e69595c2 | 278 | int crtc; |
2368ffb1 | 279 | unsigned long irqflags; |
e69595c2 | 280 | |
0a3e67a4 JB |
281 | /* Bail if the driver didn't call drm_vblank_init() */ |
282 | if (dev->num_crtcs == 0) | |
283 | return; | |
284 | ||
e69595c2 | 285 | for (crtc = 0; crtc < dev->num_crtcs; crtc++) { |
8a51d5be VS |
286 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
287 | ||
288 | del_timer_sync(&vblank->disable_timer); | |
2368ffb1 MK |
289 | |
290 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
291 | vblank_disable_and_save(dev, crtc); | |
292 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
e69595c2 | 293 | } |
0a3e67a4 | 294 | |
5380e929 | 295 | kfree(dev->vblank); |
0a3e67a4 JB |
296 | |
297 | dev->num_crtcs = 0; | |
298 | } | |
e77cef9c | 299 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 300 | |
f5752b38 DV |
301 | /** |
302 | * drm_vblank_init - initialize vblank support | |
303 | * @dev: drm_device | |
304 | * @num_crtcs: number of crtcs supported by @dev | |
305 | * | |
306 | * This function initializes vblank support for @num_crtcs display pipelines. | |
307 | * | |
308 | * Returns: | |
309 | * Zero on success or a negative error code on failure. | |
310 | */ | |
0a3e67a4 JB |
311 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) |
312 | { | |
313 | int i, ret = -ENOMEM; | |
314 | ||
0a3e67a4 | 315 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
316 | spin_lock_init(&dev->vblank_time_lock); |
317 | ||
0a3e67a4 JB |
318 | dev->num_crtcs = num_crtcs; |
319 | ||
5380e929 VS |
320 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
321 | if (!dev->vblank) | |
0a3e67a4 JB |
322 | goto err; |
323 | ||
e69595c2 | 324 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
325 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
326 | ||
327 | vblank->dev = dev; | |
328 | vblank->crtc = i; | |
329 | init_waitqueue_head(&vblank->queue); | |
330 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
331 | (unsigned long)vblank); | |
e69595c2 | 332 | } |
27641c3f | 333 | |
8f6fce03 | 334 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
335 | |
336 | /* Driver specific high-precision vblank timestamping supported? */ | |
337 | if (dev->driver->get_vblank_timestamp) | |
338 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
339 | else | |
340 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
341 | ||
ba0bf120 VS |
342 | dev->vblank_disable_allowed = false; |
343 | ||
0a3e67a4 JB |
344 | return 0; |
345 | ||
346 | err: | |
79a093ae | 347 | dev->num_crtcs = 0; |
0a3e67a4 JB |
348 | return ret; |
349 | } | |
350 | EXPORT_SYMBOL(drm_vblank_init); | |
351 | ||
28d52043 DA |
352 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
353 | { | |
354 | struct drm_device *dev = cookie; | |
355 | ||
356 | if (dev->driver->vgaarb_irq) { | |
357 | dev->driver->vgaarb_irq(dev, state); | |
358 | return; | |
359 | } | |
360 | ||
361 | if (!dev->irq_enabled) | |
362 | return; | |
363 | ||
5037f8ac JS |
364 | if (state) { |
365 | if (dev->driver->irq_uninstall) | |
366 | dev->driver->irq_uninstall(dev); | |
367 | } else { | |
368 | if (dev->driver->irq_preinstall) | |
369 | dev->driver->irq_preinstall(dev); | |
370 | if (dev->driver->irq_postinstall) | |
371 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
372 | } |
373 | } | |
374 | ||
1da177e4 | 375 | /** |
f5752b38 DV |
376 | * drm_irq_install - install IRQ handler |
377 | * @dev: DRM device | |
378 | * @irq: IRQ number to install the handler for | |
1da177e4 | 379 | * |
0a3e67a4 | 380 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
381 | * irq_preinstall() and irq_postinstall() functions before and after the |
382 | * installation. | |
383 | * | |
384 | * This is the simplified helper interface provided for drivers with no special | |
385 | * needs. Drivers which need to install interrupt handlers for multiple | |
386 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
387 | * that vblank interrupts are available. | |
388 | * | |
389 | * Returns: | |
390 | * Zero on success or a negative error code on failure. | |
1da177e4 | 391 | */ |
bb0f1b5c | 392 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 393 | { |
4a1b0714 | 394 | int ret; |
b5e89ed5 | 395 | unsigned long sh_flags = 0; |
1da177e4 LT |
396 | |
397 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
398 | return -EINVAL; | |
399 | ||
7c1a38e3 | 400 | if (irq == 0) |
1da177e4 LT |
401 | return -EINVAL; |
402 | ||
1da177e4 | 403 | /* Driver must have been initialized */ |
e090c53b | 404 | if (!dev->dev_private) |
1da177e4 | 405 | return -EINVAL; |
1da177e4 | 406 | |
e090c53b | 407 | if (dev->irq_enabled) |
1da177e4 | 408 | return -EBUSY; |
4423843c | 409 | dev->irq_enabled = true; |
1da177e4 | 410 | |
7c1a38e3 | 411 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 412 | |
b5e89ed5 | 413 | /* Before installing handler */ |
5037f8ac JS |
414 | if (dev->driver->irq_preinstall) |
415 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 416 | |
b5e89ed5 | 417 | /* Install handler */ |
1da177e4 | 418 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 419 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 420 | |
7c1a38e3 | 421 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 422 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 423 | |
b5e89ed5 | 424 | if (ret < 0) { |
4423843c | 425 | dev->irq_enabled = false; |
1da177e4 LT |
426 | return ret; |
427 | } | |
428 | ||
28d52043 DA |
429 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
430 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
431 | ||
b5e89ed5 | 432 | /* After installing handler */ |
5037f8ac JS |
433 | if (dev->driver->irq_postinstall) |
434 | ret = dev->driver->irq_postinstall(dev); | |
435 | ||
0a3e67a4 | 436 | if (ret < 0) { |
4423843c | 437 | dev->irq_enabled = false; |
e1c44acc JS |
438 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
439 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
7c1a38e3 DV |
440 | free_irq(irq, dev); |
441 | } else { | |
442 | dev->irq = irq; | |
0a3e67a4 | 443 | } |
1da177e4 | 444 | |
0a3e67a4 | 445 | return ret; |
1da177e4 | 446 | } |
0a3e67a4 | 447 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
448 | |
449 | /** | |
f5752b38 DV |
450 | * drm_irq_uninstall - uninstall the IRQ handler |
451 | * @dev: DRM device | |
452 | * | |
453 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
454 | * This should only be called by drivers which used drm_irq_install() to set up | |
455 | * their interrupt handler. Other drivers must only reset | |
456 | * drm_device->irq_enabled to false. | |
1da177e4 | 457 | * |
f5752b38 DV |
458 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
459 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
460 | * the same function through an ioctl. | |
1da177e4 | 461 | * |
f5752b38 DV |
462 | * Returns: |
463 | * Zero on success or a negative error code on failure. | |
1da177e4 | 464 | */ |
27641c3f | 465 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 466 | { |
dc1336ff | 467 | unsigned long irqflags; |
4423843c VS |
468 | bool irq_enabled; |
469 | int i; | |
1da177e4 LT |
470 | |
471 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
472 | return -EINVAL; | |
473 | ||
1da177e4 | 474 | irq_enabled = dev->irq_enabled; |
4423843c | 475 | dev->irq_enabled = false; |
1da177e4 | 476 | |
dc1336ff JB |
477 | /* |
478 | * Wake up any waiters so they don't hang. | |
479 | */ | |
bde4889a BS |
480 | if (dev->num_crtcs) { |
481 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
482 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
483 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
484 | ||
485 | wake_up(&vblank->queue); | |
486 | vblank->enabled = false; | |
487 | vblank->last = | |
bde4889a BS |
488 | dev->driver->get_vblank_counter(dev, i); |
489 | } | |
490 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 491 | } |
dc1336ff | 492 | |
b5e89ed5 | 493 | if (!irq_enabled) |
1da177e4 LT |
494 | return -EINVAL; |
495 | ||
7c1a38e3 | 496 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 497 | |
28d52043 DA |
498 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
499 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
500 | ||
5037f8ac JS |
501 | if (dev->driver->irq_uninstall) |
502 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 503 | |
7c1a38e3 | 504 | free_irq(dev->irq, dev); |
1da177e4 LT |
505 | |
506 | return 0; | |
507 | } | |
508 | EXPORT_SYMBOL(drm_irq_uninstall); | |
509 | ||
f5752b38 | 510 | /* |
1da177e4 LT |
511 | * IRQ control ioctl. |
512 | * | |
513 | * \param inode device inode. | |
6c340eac | 514 | * \param file_priv DRM file private. |
1da177e4 LT |
515 | * \param cmd command. |
516 | * \param arg user argument, pointing to a drm_control structure. | |
517 | * \return zero on success or a negative number on failure. | |
518 | * | |
519 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
520 | */ | |
c153f45f EA |
521 | int drm_control(struct drm_device *dev, void *data, |
522 | struct drm_file *file_priv) | |
1da177e4 | 523 | { |
c153f45f | 524 | struct drm_control *ctl = data; |
a319c1a4 | 525 | int ret = 0, irq; |
b5e89ed5 | 526 | |
27641c3f MK |
527 | /* if we haven't irq we fallback for compatibility reasons - |
528 | * this used to be a separate function in drm_dma.h | |
529 | */ | |
1da177e4 | 530 | |
22471cf6 DV |
531 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
532 | return 0; | |
533 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
534 | return 0; | |
535 | /* UMS was only ever support on pci devices. */ | |
536 | if (WARN_ON(!dev->pdev)) | |
537 | return -EINVAL; | |
1da177e4 | 538 | |
c153f45f | 539 | switch (ctl->func) { |
1da177e4 | 540 | case DRM_INST_HANDLER: |
a319c1a4 DV |
541 | irq = dev->pdev->irq; |
542 | ||
1da177e4 | 543 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 544 | ctl->irq != irq) |
1da177e4 | 545 | return -EINVAL; |
e090c53b | 546 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 547 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
548 | mutex_unlock(&dev->struct_mutex); |
549 | ||
550 | return ret; | |
1da177e4 | 551 | case DRM_UNINST_HANDLER: |
e090c53b DV |
552 | mutex_lock(&dev->struct_mutex); |
553 | ret = drm_irq_uninstall(dev); | |
554 | mutex_unlock(&dev->struct_mutex); | |
555 | ||
556 | return ret; | |
1da177e4 LT |
557 | default: |
558 | return -EINVAL; | |
559 | } | |
560 | } | |
561 | ||
27641c3f | 562 | /** |
f5752b38 DV |
563 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
564 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
565 | * @mode: display mode containing the scanout timings | |
27641c3f | 566 | * |
21b21560 VS |
567 | * Calculate and store various constants which are later |
568 | * needed by vblank and swap-completion timestamping, e.g, | |
569 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 570 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 571 | * things like panel scaling or other adjustments into account. |
27641c3f | 572 | */ |
545cdd55 VS |
573 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
574 | const struct drm_display_mode *mode) | |
27641c3f | 575 | { |
3c184f69 | 576 | int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; |
77666b72 | 577 | int dotclock = mode->crtc_clock; |
27641c3f MK |
578 | |
579 | /* Valid dotclock? */ | |
580 | if (dotclock > 0) { | |
0dae35a3 VS |
581 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
582 | ||
583 | /* | |
584 | * Convert scanline length in pixels and video | |
585 | * dot clock to line duration, frame duration | |
586 | * and pixel duration in nanoseconds: | |
27641c3f | 587 | */ |
0dae35a3 VS |
588 | pixeldur_ns = 1000000 / dotclock; |
589 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
590 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
591 | |
592 | /* | |
593 | * Fields of interlaced scanout modes are only half a frame duration. | |
594 | */ | |
595 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
596 | framedur_ns /= 2; | |
27641c3f MK |
597 | } else |
598 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", | |
599 | crtc->base.id); | |
600 | ||
601 | crtc->pixeldur_ns = pixeldur_ns; | |
602 | crtc->linedur_ns = linedur_ns; | |
603 | crtc->framedur_ns = framedur_ns; | |
604 | ||
605 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
545cdd55 VS |
606 | crtc->base.id, mode->crtc_htotal, |
607 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
27641c3f | 608 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", |
3c184f69 VS |
609 | crtc->base.id, dotclock, framedur_ns, |
610 | linedur_ns, pixeldur_ns); | |
27641c3f MK |
611 | } |
612 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
613 | ||
614 | /** | |
f5752b38 DV |
615 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
616 | * @dev: DRM device | |
617 | * @crtc: Which CRTC's vblank timestamp to retrieve | |
618 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
619 | * On return contains true maximum error of timestamp | |
620 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
621 | * @flags: Flags to pass to driver: | |
622 | * 0 = Default, | |
623 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
624 | * @refcrtc: CRTC which defines scanout timing | |
625 | * @mode: mode which defines the scanout timings | |
626 | * | |
627 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
628 | * timings and current video scanout position of a CRTC. This can be called from | |
629 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
630 | * actual timestamping. | |
27641c3f MK |
631 | * |
632 | * Should return timestamps conforming to the OML_sync_control OpenML | |
633 | * extension specification. The timestamp corresponds to the end of | |
634 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
635 | * pixel in the following video frame. | |
636 | * | |
637 | * Requires support for optional dev->driver->get_scanout_position() | |
638 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
639 | * that corresponds to the true scanout timing. | |
640 | * | |
641 | * The current implementation only handles standard video modes. It | |
642 | * returns as no operation if a doublescan or interlaced video mode is | |
643 | * active. Higher level code is expected to handle this. | |
644 | * | |
f5752b38 DV |
645 | * Returns: |
646 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
647 | * video mode: |
648 | * | |
f5752b38 | 649 | * -EINVAL - Invalid CRTC. |
27641c3f MK |
650 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
651 | * -ENOTSUPP - Function not supported in current display mode. | |
652 | * -EIO - Failed, e.g., due to failed scanout position query. | |
653 | * | |
654 | * Returns or'ed positive status flags on success: | |
655 | * | |
656 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
657 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
658 | * | |
659 | */ | |
660 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, | |
661 | int *max_error, | |
662 | struct timeval *vblank_time, | |
663 | unsigned flags, | |
7da903ef VS |
664 | const struct drm_crtc *refcrtc, |
665 | const struct drm_display_mode *mode) | |
27641c3f | 666 | { |
e62f2f5a | 667 | struct timeval tv_etime; |
d2cb58c8 | 668 | ktime_t stime, etime; |
8072bfa6 | 669 | int vbl_status; |
27641c3f | 670 | int vpos, hpos, i; |
3c184f69 | 671 | int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; |
27641c3f MK |
672 | bool invbl; |
673 | ||
674 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
675 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
676 | return -EINVAL; | |
677 | } | |
678 | ||
679 | /* Scanout position query not supported? Should not happen. */ | |
680 | if (!dev->driver->get_scanout_position) { | |
681 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
682 | return -EIO; | |
683 | } | |
684 | ||
27641c3f MK |
685 | /* Durations of frames, lines, pixels in nanoseconds. */ |
686 | framedur_ns = refcrtc->framedur_ns; | |
687 | linedur_ns = refcrtc->linedur_ns; | |
688 | pixeldur_ns = refcrtc->pixeldur_ns; | |
689 | ||
690 | /* If mode timing undefined, just return as no-op: | |
691 | * Happens during initial modesetting of a crtc. | |
692 | */ | |
8072bfa6 | 693 | if (framedur_ns == 0) { |
27641c3f MK |
694 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); |
695 | return -EAGAIN; | |
696 | } | |
697 | ||
27641c3f MK |
698 | /* Get current scanout position with system timestamp. |
699 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
700 | * if single query takes longer than max_error nanoseconds. | |
701 | * | |
702 | * This guarantees a tight bound on maximum error if | |
703 | * code gets preempted or delayed for some reason. | |
704 | */ | |
705 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
706 | /* |
707 | * Get vertical and horizontal scanout position vpos, hpos, | |
708 | * and bounding timestamps stime, etime, pre/post query. | |
709 | */ | |
abca9e45 | 710 | vbl_status = dev->driver->get_scanout_position(dev, crtc, flags, &vpos, |
8f6fce03 | 711 | &hpos, &stime, &etime); |
27641c3f | 712 | |
27641c3f MK |
713 | /* Return as no-op if scanout query unsupported or failed. */ |
714 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
715 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
716 | crtc, vbl_status); | |
717 | return -EIO; | |
718 | } | |
719 | ||
8f6fce03 | 720 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 721 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
722 | |
723 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 724 | if (duration_ns <= *max_error) |
27641c3f MK |
725 | break; |
726 | } | |
727 | ||
728 | /* Noisy system timing? */ | |
729 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
730 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
3c184f69 | 731 | crtc, duration_ns/1000, *max_error/1000, i); |
27641c3f MK |
732 | } |
733 | ||
734 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 735 | *max_error = duration_ns; |
27641c3f MK |
736 | |
737 | /* Check if in vblank area: | |
738 | * vpos is >=0 in video scanout area, but negative | |
739 | * within vblank area, counting down the number of lines until | |
740 | * start of scanout. | |
741 | */ | |
3d3cbd84 | 742 | invbl = vbl_status & DRM_SCANOUTPOS_IN_VBLANK; |
27641c3f MK |
743 | |
744 | /* Convert scanout position into elapsed time at raw_time query | |
745 | * since start of scanout at first display scanline. delta_ns | |
746 | * can be negative if start of scanout hasn't happened yet. | |
747 | */ | |
3c184f69 | 748 | delta_ns = vpos * linedur_ns + hpos * pixeldur_ns; |
27641c3f | 749 | |
c61eef72 | 750 | if (!drm_timestamp_monotonic) |
d2cb58c8 | 751 | etime = ktime_mono_to_real(etime); |
c61eef72 | 752 | |
e62f2f5a ID |
753 | /* save this only for debugging purposes */ |
754 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
755 | /* Subtract time delta from raw timestamp to get final |
756 | * vblank_time timestamp for end of vblank. | |
757 | */ | |
e91abf80 MD |
758 | if (delta_ns < 0) |
759 | etime = ktime_add_ns(etime, -delta_ns); | |
760 | else | |
761 | etime = ktime_sub_ns(etime, delta_ns); | |
e62f2f5a | 762 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 763 | |
bbb0aef5 JP |
764 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
765 | crtc, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 766 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 | 767 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
3c184f69 | 768 | duration_ns/1000, i); |
27641c3f MK |
769 | |
770 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
771 | if (invbl) | |
3d3cbd84 | 772 | vbl_status |= DRM_VBLANKTIME_IN_VBLANK; |
27641c3f MK |
773 | |
774 | return vbl_status; | |
775 | } | |
776 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
777 | ||
c61eef72 ID |
778 | static struct timeval get_drm_timestamp(void) |
779 | { | |
780 | ktime_t now; | |
781 | ||
d2cb58c8 | 782 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
c61eef72 ID |
783 | return ktime_to_timeval(now); |
784 | } | |
785 | ||
27641c3f MK |
786 | /** |
787 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
4dfd909f | 788 | * vblank interval |
27641c3f | 789 | * @dev: DRM device |
f5752b38 | 790 | * @crtc: which CRTC's vblank timestamp to retrieve |
27641c3f MK |
791 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
792 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
793 | * 0 = Default, |
794 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
795 | * |
796 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 797 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
798 | * compute the timestamp with a high-precision GPU specific method. |
799 | * | |
800 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
801 | * call, i.e., it isn't very precisely locked to the true vblank. | |
802 | * | |
f5752b38 | 803 | * Returns: |
fb446a1a | 804 | * True if timestamp is considered to be very precise, false otherwise. |
27641c3f | 805 | */ |
fb446a1a DV |
806 | static bool |
807 | drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
808 | struct timeval *tvblank, unsigned flags) | |
27641c3f | 809 | { |
4a1b0714 | 810 | int ret; |
27641c3f MK |
811 | |
812 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
813 | int max_error = (int) drm_timestamp_precision * 1000; | |
814 | ||
815 | /* Query driver if possible and precision timestamping enabled. */ | |
816 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
817 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
818 | tvblank, flags); | |
819 | if (ret > 0) | |
fb446a1a | 820 | return true; |
27641c3f MK |
821 | } |
822 | ||
823 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 824 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 825 | */ |
c61eef72 | 826 | *tvblank = get_drm_timestamp(); |
27641c3f | 827 | |
fb446a1a | 828 | return false; |
27641c3f | 829 | } |
27641c3f | 830 | |
0a3e67a4 JB |
831 | /** |
832 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
833 | * @dev: DRM device | |
834 | * @crtc: which counter to retrieve | |
835 | * | |
836 | * Fetches the "cooked" vblank count value that represents the number of | |
837 | * vblank events since the system was booted, including lost events due to | |
838 | * modesetting activity. | |
f5752b38 | 839 | * |
96d3f91e TR |
840 | * This is the legacy version of drm_crtc_vblank_count(). |
841 | * | |
f5752b38 DV |
842 | * Returns: |
843 | * The software vblank counter. | |
0a3e67a4 JB |
844 | */ |
845 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
846 | { | |
8a51d5be VS |
847 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
848 | ||
e6ae8687 RC |
849 | if (WARN_ON(crtc >= dev->num_crtcs)) |
850 | return 0; | |
8a51d5be | 851 | return atomic_read(&vblank->count); |
0a3e67a4 JB |
852 | } |
853 | EXPORT_SYMBOL(drm_vblank_count); | |
854 | ||
96d3f91e TR |
855 | /** |
856 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
857 | * @crtc: which counter to retrieve | |
858 | * | |
859 | * Fetches the "cooked" vblank count value that represents the number of | |
860 | * vblank events since the system was booted, including lost events due to | |
861 | * modesetting activity. | |
862 | * | |
863 | * This is the native KMS version of drm_vblank_count(). | |
864 | * | |
865 | * Returns: | |
866 | * The software vblank counter. | |
867 | */ | |
868 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) | |
869 | { | |
870 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
871 | } | |
872 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
873 | ||
27641c3f MK |
874 | /** |
875 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
876 | * and the system timestamp corresponding to that vblank counter value. | |
877 | * | |
878 | * @dev: DRM device | |
879 | * @crtc: which counter to retrieve | |
880 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
881 | * | |
882 | * Fetches the "cooked" vblank count value that represents the number of | |
883 | * vblank events since the system was booted, including lost events due to | |
884 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 885 | * of the vblank interval that corresponds to the current vblank counter value. |
27641c3f MK |
886 | */ |
887 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
888 | struct timeval *vblanktime) | |
889 | { | |
8a51d5be | 890 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
891 | u32 cur_vblank; |
892 | ||
e6ae8687 RC |
893 | if (WARN_ON(crtc >= dev->num_crtcs)) |
894 | return 0; | |
895 | ||
27641c3f MK |
896 | /* Read timestamp from slot of _vblank_time ringbuffer |
897 | * that corresponds to current vblank count. Retry if | |
898 | * count has incremented during readout. This works like | |
899 | * a seqlock. | |
900 | */ | |
901 | do { | |
8a51d5be | 902 | cur_vblank = atomic_read(&vblank->count); |
27641c3f MK |
903 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); |
904 | smp_rmb(); | |
8a51d5be | 905 | } while (cur_vblank != atomic_read(&vblank->count)); |
27641c3f MK |
906 | |
907 | return cur_vblank; | |
908 | } | |
909 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
910 | ||
c6eefa17 RC |
911 | static void send_vblank_event(struct drm_device *dev, |
912 | struct drm_pending_vblank_event *e, | |
913 | unsigned long seq, struct timeval *now) | |
914 | { | |
915 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
916 | e->event.sequence = seq; | |
917 | e->event.tv_sec = now->tv_sec; | |
918 | e->event.tv_usec = now->tv_usec; | |
919 | ||
920 | list_add_tail(&e->base.link, | |
921 | &e->base.file_priv->event_list); | |
922 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
923 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
924 | e->event.sequence); | |
925 | } | |
926 | ||
927 | /** | |
928 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
929 | * @dev: DRM device | |
930 | * @crtc: CRTC in question | |
931 | * @e: the event to send | |
932 | * | |
933 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
934 | * Caller must hold event lock. | |
a4d7b30d TR |
935 | * |
936 | * This is the legacy version of drm_crtc_send_vblank_event(). | |
c6eefa17 RC |
937 | */ |
938 | void drm_send_vblank_event(struct drm_device *dev, int crtc, | |
939 | struct drm_pending_vblank_event *e) | |
940 | { | |
941 | struct timeval now; | |
942 | unsigned int seq; | |
4dfd909f | 943 | |
c6eefa17 RC |
944 | if (crtc >= 0) { |
945 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
946 | } else { | |
947 | seq = 0; | |
c61eef72 ID |
948 | |
949 | now = get_drm_timestamp(); | |
c6eefa17 | 950 | } |
21a245d2 | 951 | e->pipe = crtc; |
c6eefa17 RC |
952 | send_vblank_event(dev, e, seq, &now); |
953 | } | |
954 | EXPORT_SYMBOL(drm_send_vblank_event); | |
955 | ||
a4d7b30d TR |
956 | /** |
957 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
958 | * @crtc: the source CRTC of the vblank event | |
959 | * @e: the event to send | |
960 | * | |
961 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
962 | * Caller must hold event lock. | |
963 | * | |
964 | * This is the native KMS version of drm_send_vblank_event(). | |
965 | */ | |
966 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
967 | struct drm_pending_vblank_event *e) | |
968 | { | |
969 | drm_send_vblank_event(crtc->dev, drm_crtc_index(crtc), e); | |
970 | } | |
971 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
972 | ||
f2752282 VS |
973 | /** |
974 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
975 | * @dev: DRM device | |
976 | * @crtc: CRTC in question | |
977 | */ | |
978 | static int drm_vblank_enable(struct drm_device *dev, int crtc) | |
979 | { | |
8a51d5be | 980 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f2752282 VS |
981 | int ret = 0; |
982 | ||
983 | assert_spin_locked(&dev->vbl_lock); | |
984 | ||
985 | spin_lock(&dev->vblank_time_lock); | |
986 | ||
8a51d5be | 987 | if (!vblank->enabled) { |
1cfb80b1 DV |
988 | /* |
989 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
990 | * All vblank count & timestamp updates are held off |
991 | * until we are done reinitializing master counter and | |
992 | * timestamps. Filtercode in drm_handle_vblank() will | |
993 | * prevent double-accounting of same vblank interval. | |
994 | */ | |
995 | ret = dev->driver->enable_vblank(dev, crtc); | |
996 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); | |
997 | if (ret) | |
8a51d5be | 998 | atomic_dec(&vblank->refcount); |
f2752282 | 999 | else { |
8a51d5be | 1000 | vblank->enabled = true; |
f2752282 VS |
1001 | drm_update_vblank_count(dev, crtc); |
1002 | } | |
1003 | } | |
1004 | ||
1005 | spin_unlock(&dev->vblank_time_lock); | |
1006 | ||
1007 | return ret; | |
1008 | } | |
1009 | ||
0a3e67a4 JB |
1010 | /** |
1011 | * drm_vblank_get - get a reference count on vblank events | |
1012 | * @dev: DRM device | |
1013 | * @crtc: which CRTC to own | |
1014 | * | |
1015 | * Acquire a reference count on vblank events to avoid having them disabled | |
1016 | * while in use. | |
1017 | * | |
89dd6a4b DV |
1018 | * This is the legacy version of drm_crtc_vblank_get(). |
1019 | * | |
f5752b38 | 1020 | * Returns: |
0a3e67a4 JB |
1021 | * Zero on success, nonzero on failure. |
1022 | */ | |
1023 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
1024 | { | |
8a51d5be | 1025 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
97cbc883 | 1026 | unsigned long irqflags; |
0a3e67a4 JB |
1027 | int ret = 0; |
1028 | ||
e6ae8687 RC |
1029 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1030 | return -EINVAL; | |
1031 | ||
0a3e67a4 JB |
1032 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1033 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 1034 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
f2752282 | 1035 | ret = drm_vblank_enable(dev, crtc); |
778c9026 | 1036 | } else { |
8a51d5be VS |
1037 | if (!vblank->enabled) { |
1038 | atomic_dec(&vblank->refcount); | |
778c9026 | 1039 | ret = -EINVAL; |
0a3e67a4 JB |
1040 | } |
1041 | } | |
1042 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1043 | ||
1044 | return ret; | |
1045 | } | |
1046 | EXPORT_SYMBOL(drm_vblank_get); | |
1047 | ||
89dd6a4b DV |
1048 | /** |
1049 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1050 | * @crtc: which CRTC to own | |
1051 | * | |
1052 | * Acquire a reference count on vblank events to avoid having them disabled | |
1053 | * while in use. | |
1054 | * | |
1055 | * This is the native kms version of drm_vblank_off(). | |
1056 | * | |
1057 | * Returns: | |
1058 | * Zero on success, nonzero on failure. | |
1059 | */ | |
1060 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1061 | { | |
1062 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1063 | } | |
1064 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1065 | ||
0a3e67a4 JB |
1066 | /** |
1067 | * drm_vblank_put - give up ownership of vblank events | |
1068 | * @dev: DRM device | |
1069 | * @crtc: which counter to give up | |
1070 | * | |
1071 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 1072 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
1073 | * |
1074 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 JB |
1075 | */ |
1076 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
1077 | { | |
8a51d5be VS |
1078 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
1079 | ||
7f907bf2 RC |
1080 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) |
1081 | return; | |
b3f5e732 | 1082 | |
e6ae8687 RC |
1083 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1084 | return; | |
1085 | ||
0a3e67a4 | 1086 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1087 | if (atomic_dec_and_test(&vblank->refcount)) { |
ab8905f1 DV |
1088 | if (drm_vblank_offdelay == 0) |
1089 | return; | |
1090 | else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) | |
4ed0ce3d | 1091 | vblank_disable_fn((unsigned long)vblank); |
ab8905f1 | 1092 | else |
4ed0ce3d VS |
1093 | mod_timer(&vblank->disable_timer, |
1094 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1095 | } | |
0a3e67a4 JB |
1096 | } |
1097 | EXPORT_SYMBOL(drm_vblank_put); | |
1098 | ||
89dd6a4b DV |
1099 | /** |
1100 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1101 | * @crtc: which counter to give up | |
1102 | * | |
1103 | * Release ownership of a given vblank counter, turning off interrupts | |
1104 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1105 | * | |
1106 | * This is the native kms version of drm_vblank_put(). | |
1107 | */ | |
1108 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1109 | { | |
1110 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1111 | } | |
1112 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1113 | ||
e8450f51 DV |
1114 | /** |
1115 | * drm_wait_one_vblank - wait for one vblank | |
1116 | * @dev: DRM device | |
1117 | * @crtc: crtc index | |
1118 | * | |
1119 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1120 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1121 | * due to lack of driver support or because the crtc is off. | |
1122 | */ | |
1123 | void drm_wait_one_vblank(struct drm_device *dev, int crtc) | |
1124 | { | |
1125 | int ret; | |
1126 | u32 last; | |
1127 | ||
1128 | ret = drm_vblank_get(dev, crtc); | |
80c873b6 | 1129 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", crtc, ret)) |
e8450f51 DV |
1130 | return; |
1131 | ||
1132 | last = drm_vblank_count(dev, crtc); | |
1133 | ||
1134 | ret = wait_event_timeout(dev->vblank[crtc].queue, | |
1135 | last != drm_vblank_count(dev, crtc), | |
1136 | msecs_to_jiffies(100)); | |
1137 | ||
80c873b6 | 1138 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", crtc); |
e8450f51 DV |
1139 | |
1140 | drm_vblank_put(dev, crtc); | |
1141 | } | |
1142 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1143 | ||
1144 | /** | |
1145 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1146 | * @crtc: DRM crtc | |
1147 | * | |
1148 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1149 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1150 | * due to lack of driver support or because the crtc is off. | |
1151 | */ | |
1152 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1153 | { | |
1154 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1155 | } | |
1156 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1157 | ||
c6eefa17 RC |
1158 | /** |
1159 | * drm_vblank_off - disable vblank events on a CRTC | |
1160 | * @dev: DRM device | |
1161 | * @crtc: CRTC in question | |
1162 | * | |
f5752b38 DV |
1163 | * Drivers can use this function to shut down the vblank interrupt handling when |
1164 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1165 | * stored so that drm_vblank_on() can restore it again. | |
1166 | * | |
1167 | * Drivers must use this function when the hardware vblank counter can get | |
1168 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1169 | * |
1170 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1171 | */ |
778c9026 LP |
1172 | void drm_vblank_off(struct drm_device *dev, int crtc) |
1173 | { | |
8a51d5be | 1174 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
498548ec CJHR |
1175 | struct drm_pending_vblank_event *e, *t; |
1176 | struct timeval now; | |
778c9026 | 1177 | unsigned long irqflags; |
498548ec | 1178 | unsigned int seq; |
778c9026 | 1179 | |
e6ae8687 RC |
1180 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1181 | return; | |
1182 | ||
56cc279b VS |
1183 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1184 | ||
1185 | spin_lock(&dev->vbl_lock); | |
27641c3f | 1186 | vblank_disable_and_save(dev, crtc); |
8a51d5be | 1187 | wake_up(&vblank->queue); |
498548ec | 1188 | |
56cc279b VS |
1189 | /* |
1190 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1191 | * the vblank interrupt by bumping the refcount. | |
1192 | */ | |
1193 | if (!vblank->inmodeset) { | |
1194 | atomic_inc(&vblank->refcount); | |
1195 | vblank->inmodeset = 1; | |
1196 | } | |
1197 | spin_unlock(&dev->vbl_lock); | |
1198 | ||
498548ec CJHR |
1199 | /* Send any queued vblank events, lest the natives grow disquiet */ |
1200 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
e7783ba3 | 1201 | |
498548ec CJHR |
1202 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
1203 | if (e->pipe != crtc) | |
1204 | continue; | |
1205 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
1206 | wanted %d, current %d\n", | |
1207 | e->event.sequence, seq); | |
c6eefa17 | 1208 | list_del(&e->base.link); |
498548ec | 1209 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1210 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1211 | } |
56cc279b | 1212 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 LP |
1213 | } |
1214 | EXPORT_SYMBOL(drm_vblank_off); | |
1215 | ||
89dd6a4b DV |
1216 | /** |
1217 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1218 | * @crtc: CRTC in question | |
1219 | * | |
1220 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1221 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1222 | * stored so that drm_vblank_on can restore it again. | |
1223 | * | |
1224 | * Drivers must use this function when the hardware vblank counter can get | |
1225 | * reset, e.g. when suspending. | |
1226 | * | |
1227 | * This is the native kms version of drm_vblank_off(). | |
1228 | */ | |
1229 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1230 | { | |
1231 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1232 | } | |
1233 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1234 | ||
f2752282 VS |
1235 | /** |
1236 | * drm_vblank_on - enable vblank events on a CRTC | |
1237 | * @dev: DRM device | |
1238 | * @crtc: CRTC in question | |
f5752b38 DV |
1239 | * |
1240 | * This functions restores the vblank interrupt state captured with | |
1241 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1242 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
f5752b38 | 1243 | * in driver load code to reflect the current hardware state of the crtc. |
89dd6a4b DV |
1244 | * |
1245 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 VS |
1246 | */ |
1247 | void drm_vblank_on(struct drm_device *dev, int crtc) | |
1248 | { | |
8a51d5be | 1249 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f2752282 VS |
1250 | unsigned long irqflags; |
1251 | ||
e6ae8687 RC |
1252 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1253 | return; | |
1254 | ||
f2752282 | 1255 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
7ffd7a68 | 1256 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1257 | if (vblank->inmodeset) { |
1258 | atomic_dec(&vblank->refcount); | |
1259 | vblank->inmodeset = 0; | |
7ffd7a68 | 1260 | } |
f8ad028c VS |
1261 | |
1262 | /* | |
1263 | * sample the current counter to avoid random jumps | |
1264 | * when drm_vblank_enable() applies the diff | |
1265 | * | |
1266 | * -1 to make sure user will never see the same | |
1267 | * vblank counter value before and after a modeset | |
1268 | */ | |
8a51d5be | 1269 | vblank->last = |
f8ad028c VS |
1270 | (dev->driver->get_vblank_counter(dev, crtc) - 1) & |
1271 | dev->max_vblank_count; | |
cd19e52a VS |
1272 | /* |
1273 | * re-enable interrupts if there are users left, or the | |
1274 | * user wishes vblank interrupts to be enabled all the time. | |
1275 | */ | |
1276 | if (atomic_read(&vblank->refcount) != 0 || | |
1277 | (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0)) | |
f2752282 VS |
1278 | WARN_ON(drm_vblank_enable(dev, crtc)); |
1279 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1280 | } | |
1281 | EXPORT_SYMBOL(drm_vblank_on); | |
1282 | ||
89dd6a4b DV |
1283 | /** |
1284 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1285 | * @crtc: CRTC in question | |
1286 | * | |
1287 | * This functions restores the vblank interrupt state captured with | |
1288 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1289 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
89dd6a4b DV |
1290 | * in driver load code to reflect the current hardware state of the crtc. |
1291 | * | |
1292 | * This is the native kms version of drm_vblank_on(). | |
1293 | */ | |
1294 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1295 | { | |
1296 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1297 | } | |
1298 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1299 | ||
f453ba04 DA |
1300 | /** |
1301 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1302 | * @dev: DRM device | |
1303 | * @crtc: CRTC in question | |
f453ba04 DA |
1304 | * |
1305 | * Account for vblank events across mode setting events, which will likely | |
1306 | * reset the hardware frame counter. | |
f5752b38 DV |
1307 | * |
1308 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1309 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1310 | * software-side vblank frame counting will ensure that there are no jumps or | |
1311 | * discontinuities. | |
1312 | * | |
1313 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1314 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1315 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1316 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1317 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1318 | * counters. | |
1319 | * | |
1320 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1321 | * again. | |
f453ba04 DA |
1322 | */ |
1323 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
1324 | { | |
8a51d5be VS |
1325 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
1326 | ||
b7ea85a4 | 1327 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1328 | if (!dev->num_crtcs) |
1329 | return; | |
e6ae8687 RC |
1330 | |
1331 | if (WARN_ON(crtc >= dev->num_crtcs)) | |
1332 | return; | |
1333 | ||
f453ba04 DA |
1334 | /* |
1335 | * To avoid all the problems that might happen if interrupts | |
1336 | * were enabled/disabled around or between these calls, we just | |
1337 | * have the kernel take a reference on the CRTC (just once though | |
1338 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1339 | * so that interrupts remain enabled in the interim. | |
1340 | */ | |
8a51d5be VS |
1341 | if (!vblank->inmodeset) { |
1342 | vblank->inmodeset = 0x1; | |
b3f5e732 | 1343 | if (drm_vblank_get(dev, crtc) == 0) |
8a51d5be | 1344 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1345 | } |
1346 | } | |
1347 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1348 | ||
f5752b38 DV |
1349 | /** |
1350 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1351 | * @dev: DRM device | |
1352 | * @crtc: CRTC in question | |
1353 | * | |
1354 | * This function again drops the temporary vblank reference acquired in | |
1355 | * drm_vblank_pre_modeset. | |
1356 | */ | |
f453ba04 DA |
1357 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) |
1358 | { | |
8a51d5be | 1359 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f453ba04 DA |
1360 | unsigned long irqflags; |
1361 | ||
b7ea85a4 HC |
1362 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1363 | if (!dev->num_crtcs) | |
1364 | return; | |
1365 | ||
8a51d5be | 1366 | if (vblank->inmodeset) { |
f453ba04 | 1367 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
ba0bf120 | 1368 | dev->vblank_disable_allowed = true; |
f453ba04 | 1369 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1370 | |
8a51d5be | 1371 | if (vblank->inmodeset & 0x2) |
b3f5e732 CW |
1372 | drm_vblank_put(dev, crtc); |
1373 | ||
8a51d5be | 1374 | vblank->inmodeset = 0; |
f453ba04 DA |
1375 | } |
1376 | } | |
1377 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1378 | ||
f5752b38 | 1379 | /* |
0a3e67a4 JB |
1380 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1381 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1382 | * | |
1383 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1384 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1385 | * | |
1386 | * Generally the counter will reset across mode sets. If interrupts are | |
1387 | * enabled around this call, we don't have to do anything since the counter | |
1388 | * will have already been incremented. | |
1389 | */ | |
1390 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1391 | struct drm_file *file_priv) | |
1392 | { | |
1393 | struct drm_modeset_ctl *modeset = data; | |
19227561 | 1394 | unsigned int crtc; |
0a3e67a4 JB |
1395 | |
1396 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1397 | if (!dev->num_crtcs) | |
4a1b0714 | 1398 | return 0; |
0a3e67a4 | 1399 | |
29935554 LP |
1400 | /* KMS drivers handle this internally */ |
1401 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1402 | return 0; | |
1403 | ||
0a3e67a4 | 1404 | crtc = modeset->crtc; |
4a1b0714 LP |
1405 | if (crtc >= dev->num_crtcs) |
1406 | return -EINVAL; | |
0a3e67a4 | 1407 | |
0a3e67a4 JB |
1408 | switch (modeset->cmd) { |
1409 | case _DRM_PRE_MODESET: | |
f453ba04 | 1410 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1411 | break; |
1412 | case _DRM_POST_MODESET: | |
f453ba04 | 1413 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1414 | break; |
1415 | default: | |
4a1b0714 | 1416 | return -EINVAL; |
0a3e67a4 JB |
1417 | } |
1418 | ||
4a1b0714 | 1419 | return 0; |
0a3e67a4 JB |
1420 | } |
1421 | ||
c9a9c5e0 KH |
1422 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1423 | union drm_wait_vblank *vblwait, | |
1424 | struct drm_file *file_priv) | |
1425 | { | |
ffe7c73a | 1426 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1427 | struct drm_pending_vblank_event *e; |
1428 | struct timeval now; | |
1429 | unsigned long flags; | |
1430 | unsigned int seq; | |
ea5d552c | 1431 | int ret; |
c9a9c5e0 | 1432 | |
f76511b9 | 1433 | e = kzalloc(sizeof(*e), GFP_KERNEL); |
ea5d552c CW |
1434 | if (e == NULL) { |
1435 | ret = -ENOMEM; | |
1436 | goto err_put; | |
1437 | } | |
c9a9c5e0 KH |
1438 | |
1439 | e->pipe = pipe; | |
b9c2c9ae | 1440 | e->base.pid = current->pid; |
c9a9c5e0 | 1441 | e->event.base.type = DRM_EVENT_VBLANK; |
f76511b9 | 1442 | e->event.base.length = sizeof(e->event); |
c9a9c5e0 KH |
1443 | e->event.user_data = vblwait->request.signal; |
1444 | e->base.event = &e->event.base; | |
1445 | e->base.file_priv = file_priv; | |
1446 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1447 | ||
c9a9c5e0 KH |
1448 | spin_lock_irqsave(&dev->event_lock, flags); |
1449 | ||
ffe7c73a VS |
1450 | /* |
1451 | * drm_vblank_off() might have been called after we called | |
1452 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1453 | * around the vblank disable, so no need for further locking. | |
1454 | * The reference from drm_vblank_get() protects against | |
1455 | * vblank disable from another source. | |
1456 | */ | |
1457 | if (!vblank->enabled) { | |
1458 | ret = -EINVAL; | |
1459 | goto err_unlock; | |
1460 | } | |
1461 | ||
f76511b9 | 1462 | if (file_priv->event_space < sizeof(e->event)) { |
ea5d552c CW |
1463 | ret = -EBUSY; |
1464 | goto err_unlock; | |
c9a9c5e0 KH |
1465 | } |
1466 | ||
f76511b9 | 1467 | file_priv->event_space -= sizeof(e->event); |
27641c3f MK |
1468 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1469 | ||
c9a9c5e0 KH |
1470 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1471 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1472 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1473 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1474 | } |
1475 | ||
1476 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1477 | vblwait->request.sequence, seq, pipe); | |
1478 | ||
b9c2c9ae JB |
1479 | trace_drm_vblank_event_queued(current->pid, pipe, |
1480 | vblwait->request.sequence); | |
1481 | ||
c9a9c5e0 KH |
1482 | e->event.sequence = vblwait->request.sequence; |
1483 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1484 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1485 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1486 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1487 | } else { |
a6778e9e | 1488 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1489 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1490 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1491 | } |
1492 | ||
1493 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1494 | ||
1495 | return 0; | |
ea5d552c CW |
1496 | |
1497 | err_unlock: | |
1498 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1499 | kfree(e); | |
1500 | err_put: | |
6f331623 | 1501 | drm_vblank_put(dev, pipe); |
ea5d552c | 1502 | return ret; |
c9a9c5e0 KH |
1503 | } |
1504 | ||
f5752b38 | 1505 | /* |
1da177e4 LT |
1506 | * Wait for VBLANK. |
1507 | * | |
1508 | * \param inode device inode. | |
6c340eac | 1509 | * \param file_priv DRM file private. |
1da177e4 LT |
1510 | * \param cmd command. |
1511 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1512 | * \return zero on success or a negative number on failure. | |
1513 | * | |
30b23634 EA |
1514 | * This function enables the vblank interrupt on the pipe requested, then |
1515 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1516 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1517 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1518 | */ |
0a3e67a4 JB |
1519 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1520 | struct drm_file *file_priv) | |
1da177e4 | 1521 | { |
8a51d5be | 1522 | struct drm_vblank_crtc *vblank; |
c153f45f | 1523 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1524 | int ret; |
19b01b5f | 1525 | unsigned int flags, seq, crtc, high_crtc; |
1da177e4 | 1526 | |
4984979b DV |
1527 | if (!dev->irq_enabled) |
1528 | return -EINVAL; | |
1da177e4 | 1529 | |
30b23634 EA |
1530 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1531 | return -EINVAL; | |
1532 | ||
c153f45f | 1533 | if (vblwait->request.type & |
19b01b5f IH |
1534 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1535 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1536 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1537 | vblwait->request.type, |
19b01b5f IH |
1538 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1539 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MCA |
1540 | return -EINVAL; |
1541 | } | |
1542 | ||
c153f45f | 1543 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
19b01b5f IH |
1544 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1545 | if (high_crtc) | |
1546 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1547 | else | |
1548 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
0a3e67a4 | 1549 | if (crtc >= dev->num_crtcs) |
776c9443 MCA |
1550 | return -EINVAL; |
1551 | ||
8a51d5be VS |
1552 | vblank = &dev->vblank[crtc]; |
1553 | ||
0a3e67a4 JB |
1554 | ret = drm_vblank_get(dev, crtc); |
1555 | if (ret) { | |
8d3457ec | 1556 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1557 | return ret; |
1558 | } | |
1559 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1560 | |
c153f45f | 1561 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1562 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1563 | vblwait->request.sequence += seq; |
1564 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1565 | case _DRM_VBLANK_ABSOLUTE: |
1566 | break; | |
1567 | default: | |
0a3e67a4 JB |
1568 | ret = -EINVAL; |
1569 | goto done; | |
1da177e4 LT |
1570 | } |
1571 | ||
a6778e9e IH |
1572 | if (flags & _DRM_VBLANK_EVENT) { |
1573 | /* must hold on to the vblank ref until the event fires | |
1574 | * drm_vblank_put will be called asynchronously | |
1575 | */ | |
c9a9c5e0 | 1576 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); |
a6778e9e | 1577 | } |
c9a9c5e0 | 1578 | |
ab285d74 | 1579 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1580 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1581 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
1582 | } |
1583 | ||
30b23634 EA |
1584 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1585 | vblwait->request.sequence, crtc); | |
8a51d5be VS |
1586 | vblank->last_wait = vblwait->request.sequence; |
1587 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
30b23634 EA |
1588 | (((drm_vblank_count(dev, crtc) - |
1589 | vblwait->request.sequence) <= (1 << 23)) || | |
8a51d5be | 1590 | !vblank->enabled || |
30b23634 | 1591 | !dev->irq_enabled)); |
1da177e4 | 1592 | |
30b23634 EA |
1593 | if (ret != -EINTR) { |
1594 | struct timeval now; | |
1da177e4 | 1595 | |
27641c3f | 1596 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1597 | vblwait->reply.tval_sec = now.tv_sec; |
1598 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1599 | |
30b23634 EA |
1600 | DRM_DEBUG("returning %d to client\n", |
1601 | vblwait->reply.sequence); | |
1da177e4 | 1602 | } else { |
30b23634 | 1603 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1604 | } |
1605 | ||
0a3e67a4 JB |
1606 | done: |
1607 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1608 | return ret; |
1609 | } | |
1610 | ||
ea7f7abc | 1611 | static void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
c9a9c5e0 KH |
1612 | { |
1613 | struct drm_pending_vblank_event *e, *t; | |
1614 | struct timeval now; | |
c9a9c5e0 KH |
1615 | unsigned int seq; |
1616 | ||
56cc279b | 1617 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1618 | |
56cc279b | 1619 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1620 | |
1621 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1622 | if (e->pipe != crtc) | |
1623 | continue; | |
1624 | if ((seq - e->event.sequence) > (1<<23)) | |
1625 | continue; | |
1626 | ||
1627 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1628 | e->event.sequence, seq); | |
1629 | ||
c6eefa17 | 1630 | list_del(&e->base.link); |
c9a9c5e0 | 1631 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1632 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1633 | } |
1634 | ||
ac2874b9 | 1635 | trace_drm_vblank_event(crtc, seq); |
c9a9c5e0 KH |
1636 | } |
1637 | ||
0a3e67a4 JB |
1638 | /** |
1639 | * drm_handle_vblank - handle a vblank event | |
1640 | * @dev: DRM device | |
1641 | * @crtc: where this event occurred | |
1642 | * | |
1643 | * Drivers should call this routine in their vblank interrupt handlers to | |
1644 | * update the vblank counter and send any signals that may be pending. | |
115ebcd4 TR |
1645 | * |
1646 | * This is the legacy version of drm_crtc_handle_vblank(). | |
0a3e67a4 | 1647 | */ |
78c6e170 | 1648 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1649 | { |
8a51d5be | 1650 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
1651 | u32 vblcount; |
1652 | s64 diff_ns; | |
1653 | struct timeval tvblank; | |
1654 | unsigned long irqflags; | |
1655 | ||
c9a9c5e0 | 1656 | if (!dev->num_crtcs) |
78c6e170 | 1657 | return false; |
c9a9c5e0 | 1658 | |
e6ae8687 RC |
1659 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1660 | return false; | |
1661 | ||
56cc279b VS |
1662 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1663 | ||
27641c3f MK |
1664 | /* Need timestamp lock to prevent concurrent execution with |
1665 | * vblank enable/disable, as this would cause inconsistent | |
1666 | * or corrupted timestamps and vblank counts. | |
1667 | */ | |
56cc279b | 1668 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1669 | |
1670 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1671 | if (!vblank->enabled) { |
56cc279b VS |
1672 | spin_unlock(&dev->vblank_time_lock); |
1673 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1674 | return false; |
27641c3f MK |
1675 | } |
1676 | ||
1677 | /* Fetch corresponding timestamp for this vblank interval from | |
1678 | * driver and store it in proper slot of timestamp ringbuffer. | |
1679 | */ | |
1680 | ||
1681 | /* Get current timestamp and count. */ | |
8a51d5be | 1682 | vblcount = atomic_read(&vblank->count); |
27641c3f MK |
1683 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); |
1684 | ||
1685 | /* Compute time difference to timestamp of last vblank */ | |
1686 | diff_ns = timeval_to_ns(&tvblank) - | |
1687 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1688 | ||
1689 | /* Update vblank timestamp and count if at least | |
1690 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1691 | * difference between last stored timestamp and current | |
1692 | * timestamp. A smaller difference means basically | |
1693 | * identical timestamps. Happens if this vblank has | |
1694 | * been already processed and this is a redundant call, | |
1695 | * e.g., due to spurious vblank interrupts. We need to | |
1696 | * ignore those for accounting. | |
1697 | */ | |
c4cc3839 | 1698 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { |
27641c3f MK |
1699 | /* Store new timestamp in ringbuffer. */ |
1700 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
27641c3f MK |
1701 | |
1702 | /* Increment cooked vblank count. This also atomically commits | |
1703 | * the timestamp computed above. | |
1704 | */ | |
4e857c58 | 1705 | smp_mb__before_atomic(); |
8a51d5be | 1706 | atomic_inc(&vblank->count); |
4e857c58 | 1707 | smp_mb__after_atomic(); |
27641c3f MK |
1708 | } else { |
1709 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", | |
1710 | crtc, (int) diff_ns); | |
1711 | } | |
1712 | ||
56cc279b VS |
1713 | spin_unlock(&dev->vblank_time_lock); |
1714 | ||
8a51d5be | 1715 | wake_up(&vblank->queue); |
c9a9c5e0 | 1716 | drm_handle_vblank_events(dev, crtc); |
27641c3f | 1717 | |
56cc279b VS |
1718 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1719 | ||
78c6e170 | 1720 | return true; |
0a3e67a4 JB |
1721 | } |
1722 | EXPORT_SYMBOL(drm_handle_vblank); | |
115ebcd4 TR |
1723 | |
1724 | /** | |
1725 | * drm_crtc_handle_vblank - handle a vblank event | |
1726 | * @crtc: where this event occurred | |
1727 | * | |
1728 | * Drivers should call this routine in their vblank interrupt handlers to | |
1729 | * update the vblank counter and send any signals that may be pending. | |
1730 | * | |
1731 | * This is the native KMS version of drm_handle_vblank(). | |
1732 | * | |
1733 | * Returns: | |
1734 | * True if the event was successfully handled, false on failure. | |
1735 | */ | |
1736 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1737 | { | |
1738 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1739 | } | |
1740 | EXPORT_SYMBOL(drm_crtc_handle_vblank); |