Commit | Line | Data |
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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 | ||
99264a61 DV |
77 | static void store_vblank(struct drm_device *dev, int crtc, |
78 | unsigned vblank_count_inc, | |
79 | struct timeval *t_vblank) | |
80 | { | |
81 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; | |
82 | u32 tslot; | |
83 | ||
84 | assert_spin_locked(&dev->vblank_time_lock); | |
85 | ||
86 | if (t_vblank) { | |
87 | /* All writers hold the spinlock, but readers are serialized by | |
88 | * the latching of vblank->count below. | |
89 | */ | |
90 | tslot = vblank->count + vblank_count_inc; | |
91 | vblanktimestamp(dev, crtc, tslot) = *t_vblank; | |
92 | } | |
93 | ||
94 | /* | |
95 | * vblank timestamp updates are protected on the write side with | |
96 | * vblank_time_lock, but on the read side done locklessly using a | |
97 | * sequence-lock on the vblank counter. Ensure correct ordering using | |
98 | * memory barrriers. We need the barrier both before and also after the | |
99 | * counter update to synchronize with the next timestamp write. | |
100 | * The read-side barriers for this are in drm_vblank_count_and_time. | |
101 | */ | |
102 | smp_wmb(); | |
103 | vblank->count += vblank_count_inc; | |
104 | smp_wmb(); | |
105 | } | |
106 | ||
13b030af VS |
107 | /** |
108 | * drm_update_vblank_count - update the master vblank counter | |
109 | * @dev: DRM device | |
110 | * @crtc: counter to update | |
111 | * | |
112 | * Call back into the driver to update the appropriate vblank counter | |
113 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
114 | * update the last read value so we can deal with wraparound on the next | |
115 | * call if necessary. | |
116 | * | |
117 | * Only necessary when going from off->on, to account for frames we | |
118 | * didn't get an interrupt for. | |
119 | * | |
120 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
121 | * device vblank fields. | |
122 | */ | |
123 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
124 | { | |
8a51d5be | 125 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
99264a61 | 126 | u32 cur_vblank, diff; |
fb446a1a | 127 | bool rc; |
13b030af VS |
128 | struct timeval t_vblank; |
129 | ||
130 | /* | |
131 | * Interrupts were disabled prior to this call, so deal with counter | |
132 | * wrap if needed. | |
133 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
134 | * here if the register is small or we had vblank interrupts off for | |
135 | * a long time. | |
136 | * | |
137 | * We repeat the hardware vblank counter & timestamp query until | |
138 | * we get consistent results. This to prevent races between gpu | |
139 | * updating its hardware counter while we are retrieving the | |
140 | * corresponding vblank timestamp. | |
141 | */ | |
142 | do { | |
143 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
144 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
145 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
146 | ||
147 | /* Deal with counter wrap */ | |
8a51d5be VS |
148 | diff = cur_vblank - vblank->last; |
149 | if (cur_vblank < vblank->last) { | |
13b030af VS |
150 | diff += dev->max_vblank_count; |
151 | ||
152 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
8a51d5be | 153 | crtc, vblank->last, cur_vblank, diff); |
13b030af VS |
154 | } |
155 | ||
96a9fdd7 | 156 | DRM_DEBUG("updating vblank count on crtc %d, missed %d\n", |
13b030af VS |
157 | crtc, diff); |
158 | ||
da8f4396 MK |
159 | if (diff == 0) |
160 | return; | |
161 | ||
99264a61 DV |
162 | /* |
163 | * Only reinitialize corresponding vblank timestamp if high-precision query | |
164 | * available and didn't fail. Will reinitialize delayed at next vblank | |
165 | * interrupt in that case. | |
13b030af | 166 | */ |
99264a61 | 167 | store_vblank(dev, crtc, diff, rc ? &t_vblank : NULL); |
13b030af VS |
168 | } |
169 | ||
27641c3f MK |
170 | /* |
171 | * Disable vblank irq's on crtc, make sure that last vblank count | |
172 | * of hardware and corresponding consistent software vblank counter | |
173 | * are preserved, even if there are any spurious vblank irq's after | |
174 | * disable. | |
175 | */ | |
176 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
177 | { | |
8a51d5be | 178 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
179 | unsigned long irqflags; |
180 | u32 vblcount; | |
181 | s64 diff_ns; | |
fb446a1a | 182 | bool vblrc; |
27641c3f | 183 | struct timeval tvblank; |
0355cf3a | 184 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
185 | |
186 | /* Prevent vblank irq processing while disabling vblank irqs, | |
187 | * so no updates of timestamps or count can happen after we've | |
188 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 189 | */ |
27641c3f MK |
190 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
191 | ||
812e7465 | 192 | /* |
393e872e | 193 | * If the vblank interrupt was already disabled update the count |
812e7465 VS |
194 | * and timestamp to maintain the appearance that the counter |
195 | * has been ticking all along until this time. This makes the | |
196 | * count account for the entire time between drm_vblank_on() and | |
197 | * drm_vblank_off(). | |
855d30b4 DV |
198 | * |
199 | * But only do this if precise vblank timestamps are available. | |
200 | * Otherwise we might read a totally bogus timestamp since drivers | |
201 | * lacking precise timestamp support rely upon sampling the system clock | |
202 | * at vblank interrupt time. Which obviously won't work out well if the | |
203 | * vblank interrupt is disabled. | |
812e7465 | 204 | */ |
855d30b4 | 205 | if (!vblank->enabled && |
fb446a1a | 206 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0)) { |
812e7465 VS |
207 | drm_update_vblank_count(dev, crtc); |
208 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
209 | return; | |
210 | } | |
211 | ||
eb2ed66f LP |
212 | /* |
213 | * Only disable vblank interrupts if they're enabled. This avoids | |
214 | * calling the ->disable_vblank() operation in atomic context with the | |
215 | * hardware potentially runtime suspended. | |
216 | */ | |
217 | if (vblank->enabled) { | |
218 | dev->driver->disable_vblank(dev, crtc); | |
219 | vblank->enabled = false; | |
220 | } | |
27641c3f MK |
221 | |
222 | /* No further vblank irq's will be processed after | |
223 | * this point. Get current hardware vblank count and | |
224 | * vblank timestamp, repeat until they are consistent. | |
225 | * | |
226 | * FIXME: There is still a race condition here and in | |
227 | * drm_update_vblank_count() which can cause off-by-one | |
228 | * reinitialization of software vblank counter. If gpu | |
229 | * vblank counter doesn't increment exactly at the leading | |
230 | * edge of a vblank interval, then we can lose 1 count if | |
231 | * we happen to execute between start of vblank and the | |
232 | * delayed gpu counter increment. | |
233 | */ | |
234 | do { | |
8a51d5be | 235 | vblank->last = dev->driver->get_vblank_counter(dev, crtc); |
27641c3f | 236 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); |
8a51d5be | 237 | } while (vblank->last != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc); |
0355cf3a EE |
238 | |
239 | if (!count) | |
240 | vblrc = 0; | |
27641c3f MK |
241 | |
242 | /* Compute time difference to stored timestamp of last vblank | |
243 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
244 | */ | |
99264a61 | 245 | vblcount = vblank->count; |
27641c3f MK |
246 | diff_ns = timeval_to_ns(&tvblank) - |
247 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
248 | ||
249 | /* If there is at least 1 msec difference between the last stored | |
250 | * timestamp and tvblank, then we are currently executing our | |
251 | * disable inside a new vblank interval, the tvblank timestamp | |
252 | * corresponds to this new vblank interval and the irq handler | |
253 | * for this vblank didn't run yet and won't run due to our disable. | |
254 | * Therefore we need to do the job of drm_handle_vblank() and | |
255 | * increment the vblank counter by one to account for this vblank. | |
256 | * | |
257 | * Skip this step if there isn't any high precision timestamp | |
258 | * available. In that case we can't account for this and just | |
259 | * hope for the best. | |
260 | */ | |
99264a61 DV |
261 | if (vblrc && (abs64(diff_ns) > 1000000)) |
262 | store_vblank(dev, crtc, 1, &tvblank); | |
27641c3f | 263 | |
27641c3f | 264 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
27641c3f MK |
265 | } |
266 | ||
0a3e67a4 JB |
267 | static void vblank_disable_fn(unsigned long arg) |
268 | { | |
e69595c2 VS |
269 | struct drm_vblank_crtc *vblank = (void *)arg; |
270 | struct drm_device *dev = vblank->dev; | |
0a3e67a4 | 271 | unsigned long irqflags; |
e69595c2 | 272 | int crtc = vblank->crtc; |
0a3e67a4 JB |
273 | |
274 | if (!dev->vblank_disable_allowed) | |
275 | return; | |
276 | ||
e69595c2 VS |
277 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
278 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { | |
279 | DRM_DEBUG("disabling vblank on crtc %d\n", crtc); | |
280 | vblank_disable_and_save(dev, crtc); | |
0a3e67a4 | 281 | } |
e69595c2 | 282 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
0a3e67a4 JB |
283 | } |
284 | ||
f5752b38 DV |
285 | /** |
286 | * drm_vblank_cleanup - cleanup vblank support | |
287 | * @dev: DRM device | |
288 | * | |
289 | * This function cleans up any resources allocated in drm_vblank_init. | |
290 | */ | |
52440211 | 291 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 | 292 | { |
e69595c2 VS |
293 | int crtc; |
294 | ||
0a3e67a4 JB |
295 | /* Bail if the driver didn't call drm_vblank_init() */ |
296 | if (dev->num_crtcs == 0) | |
297 | return; | |
298 | ||
e69595c2 | 299 | for (crtc = 0; crtc < dev->num_crtcs; crtc++) { |
8a51d5be VS |
300 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
301 | ||
3bff93d6 DV |
302 | WARN_ON(vblank->enabled && |
303 | drm_core_check_feature(dev, DRIVER_MODESET)); | |
2368ffb1 | 304 | |
3bff93d6 | 305 | del_timer_sync(&vblank->disable_timer); |
e69595c2 | 306 | } |
0a3e67a4 | 307 | |
5380e929 | 308 | kfree(dev->vblank); |
0a3e67a4 JB |
309 | |
310 | dev->num_crtcs = 0; | |
311 | } | |
e77cef9c | 312 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 | 313 | |
f5752b38 DV |
314 | /** |
315 | * drm_vblank_init - initialize vblank support | |
316 | * @dev: drm_device | |
317 | * @num_crtcs: number of crtcs supported by @dev | |
318 | * | |
319 | * This function initializes vblank support for @num_crtcs display pipelines. | |
320 | * | |
321 | * Returns: | |
322 | * Zero on success or a negative error code on failure. | |
323 | */ | |
0a3e67a4 JB |
324 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) |
325 | { | |
326 | int i, ret = -ENOMEM; | |
327 | ||
0a3e67a4 | 328 | spin_lock_init(&dev->vbl_lock); |
27641c3f MK |
329 | spin_lock_init(&dev->vblank_time_lock); |
330 | ||
0a3e67a4 JB |
331 | dev->num_crtcs = num_crtcs; |
332 | ||
5380e929 VS |
333 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
334 | if (!dev->vblank) | |
0a3e67a4 JB |
335 | goto err; |
336 | ||
e69595c2 | 337 | for (i = 0; i < num_crtcs; i++) { |
8a51d5be VS |
338 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
339 | ||
340 | vblank->dev = dev; | |
341 | vblank->crtc = i; | |
342 | init_waitqueue_head(&vblank->queue); | |
343 | setup_timer(&vblank->disable_timer, vblank_disable_fn, | |
344 | (unsigned long)vblank); | |
e69595c2 | 345 | } |
27641c3f | 346 | |
8f6fce03 | 347 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
348 | |
349 | /* Driver specific high-precision vblank timestamping supported? */ | |
350 | if (dev->driver->get_vblank_timestamp) | |
351 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
352 | else | |
353 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
354 | ||
5a8b21b2 MK |
355 | /* Must have precise timestamping for reliable vblank instant disable */ |
356 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { | |
357 | dev->vblank_disable_immediate = false; | |
358 | DRM_INFO("Setting vblank_disable_immediate to false because " | |
359 | "get_vblank_timestamp == NULL\n"); | |
360 | } | |
361 | ||
ba0bf120 VS |
362 | dev->vblank_disable_allowed = false; |
363 | ||
0a3e67a4 JB |
364 | return 0; |
365 | ||
366 | err: | |
79a093ae | 367 | dev->num_crtcs = 0; |
0a3e67a4 JB |
368 | return ret; |
369 | } | |
370 | EXPORT_SYMBOL(drm_vblank_init); | |
371 | ||
28d52043 DA |
372 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
373 | { | |
374 | struct drm_device *dev = cookie; | |
375 | ||
376 | if (dev->driver->vgaarb_irq) { | |
377 | dev->driver->vgaarb_irq(dev, state); | |
378 | return; | |
379 | } | |
380 | ||
381 | if (!dev->irq_enabled) | |
382 | return; | |
383 | ||
5037f8ac JS |
384 | if (state) { |
385 | if (dev->driver->irq_uninstall) | |
386 | dev->driver->irq_uninstall(dev); | |
387 | } else { | |
388 | if (dev->driver->irq_preinstall) | |
389 | dev->driver->irq_preinstall(dev); | |
390 | if (dev->driver->irq_postinstall) | |
391 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
392 | } |
393 | } | |
394 | ||
1da177e4 | 395 | /** |
f5752b38 DV |
396 | * drm_irq_install - install IRQ handler |
397 | * @dev: DRM device | |
398 | * @irq: IRQ number to install the handler for | |
1da177e4 | 399 | * |
0a3e67a4 | 400 | * Initializes the IRQ related data. Installs the handler, calling the driver |
f5752b38 DV |
401 | * irq_preinstall() and irq_postinstall() functions before and after the |
402 | * installation. | |
403 | * | |
404 | * This is the simplified helper interface provided for drivers with no special | |
405 | * needs. Drivers which need to install interrupt handlers for multiple | |
406 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core | |
407 | * that vblank interrupts are available. | |
408 | * | |
409 | * Returns: | |
410 | * Zero on success or a negative error code on failure. | |
1da177e4 | 411 | */ |
bb0f1b5c | 412 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 413 | { |
4a1b0714 | 414 | int ret; |
b5e89ed5 | 415 | unsigned long sh_flags = 0; |
1da177e4 LT |
416 | |
417 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
418 | return -EINVAL; | |
419 | ||
7c1a38e3 | 420 | if (irq == 0) |
1da177e4 LT |
421 | return -EINVAL; |
422 | ||
1da177e4 | 423 | /* Driver must have been initialized */ |
e090c53b | 424 | if (!dev->dev_private) |
1da177e4 | 425 | return -EINVAL; |
1da177e4 | 426 | |
e090c53b | 427 | if (dev->irq_enabled) |
1da177e4 | 428 | return -EBUSY; |
4423843c | 429 | dev->irq_enabled = true; |
1da177e4 | 430 | |
7c1a38e3 | 431 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 432 | |
b5e89ed5 | 433 | /* Before installing handler */ |
5037f8ac JS |
434 | if (dev->driver->irq_preinstall) |
435 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 436 | |
b5e89ed5 | 437 | /* Install handler */ |
1da177e4 | 438 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 439 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 440 | |
7c1a38e3 | 441 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 442 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 443 | |
b5e89ed5 | 444 | if (ret < 0) { |
4423843c | 445 | dev->irq_enabled = false; |
1da177e4 LT |
446 | return ret; |
447 | } | |
448 | ||
28d52043 DA |
449 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
450 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
451 | ||
b5e89ed5 | 452 | /* After installing handler */ |
5037f8ac JS |
453 | if (dev->driver->irq_postinstall) |
454 | ret = dev->driver->irq_postinstall(dev); | |
455 | ||
0a3e67a4 | 456 | if (ret < 0) { |
4423843c | 457 | dev->irq_enabled = false; |
e1c44acc JS |
458 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
459 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
7c1a38e3 DV |
460 | free_irq(irq, dev); |
461 | } else { | |
462 | dev->irq = irq; | |
0a3e67a4 | 463 | } |
1da177e4 | 464 | |
0a3e67a4 | 465 | return ret; |
1da177e4 | 466 | } |
0a3e67a4 | 467 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
468 | |
469 | /** | |
f5752b38 DV |
470 | * drm_irq_uninstall - uninstall the IRQ handler |
471 | * @dev: DRM device | |
472 | * | |
473 | * Calls the driver's irq_uninstall() function and unregisters the IRQ handler. | |
474 | * This should only be called by drivers which used drm_irq_install() to set up | |
475 | * their interrupt handler. Other drivers must only reset | |
476 | * drm_device->irq_enabled to false. | |
1da177e4 | 477 | * |
f5752b38 DV |
478 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
479 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
480 | * the same function through an ioctl. | |
1da177e4 | 481 | * |
f5752b38 DV |
482 | * Returns: |
483 | * Zero on success or a negative error code on failure. | |
1da177e4 | 484 | */ |
27641c3f | 485 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 486 | { |
dc1336ff | 487 | unsigned long irqflags; |
4423843c VS |
488 | bool irq_enabled; |
489 | int i; | |
1da177e4 LT |
490 | |
491 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
492 | return -EINVAL; | |
493 | ||
1da177e4 | 494 | irq_enabled = dev->irq_enabled; |
4423843c | 495 | dev->irq_enabled = false; |
1da177e4 | 496 | |
dc1336ff | 497 | /* |
3bff93d6 DV |
498 | * Wake up any waiters so they don't hang. This is just to paper over |
499 | * isssues for UMS drivers which aren't in full control of their | |
500 | * vblank/irq handling. KMS drivers must ensure that vblanks are all | |
501 | * disabled when uninstalling the irq handler. | |
dc1336ff | 502 | */ |
bde4889a BS |
503 | if (dev->num_crtcs) { |
504 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
505 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
506 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
507 | ||
3bff93d6 DV |
508 | if (!vblank->enabled) |
509 | continue; | |
510 | ||
511 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
512 | ||
513 | vblank_disable_and_save(dev, i); | |
8a51d5be | 514 | wake_up(&vblank->queue); |
bde4889a BS |
515 | } |
516 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 517 | } |
dc1336ff | 518 | |
b5e89ed5 | 519 | if (!irq_enabled) |
1da177e4 LT |
520 | return -EINVAL; |
521 | ||
7c1a38e3 | 522 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 523 | |
28d52043 DA |
524 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
525 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
526 | ||
5037f8ac JS |
527 | if (dev->driver->irq_uninstall) |
528 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 529 | |
7c1a38e3 | 530 | free_irq(dev->irq, dev); |
1da177e4 LT |
531 | |
532 | return 0; | |
533 | } | |
534 | EXPORT_SYMBOL(drm_irq_uninstall); | |
535 | ||
f5752b38 | 536 | /* |
1da177e4 LT |
537 | * IRQ control ioctl. |
538 | * | |
539 | * \param inode device inode. | |
6c340eac | 540 | * \param file_priv DRM file private. |
1da177e4 LT |
541 | * \param cmd command. |
542 | * \param arg user argument, pointing to a drm_control structure. | |
543 | * \return zero on success or a negative number on failure. | |
544 | * | |
545 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
546 | */ | |
c153f45f EA |
547 | int drm_control(struct drm_device *dev, void *data, |
548 | struct drm_file *file_priv) | |
1da177e4 | 549 | { |
c153f45f | 550 | struct drm_control *ctl = data; |
a319c1a4 | 551 | int ret = 0, irq; |
b5e89ed5 | 552 | |
27641c3f MK |
553 | /* if we haven't irq we fallback for compatibility reasons - |
554 | * this used to be a separate function in drm_dma.h | |
555 | */ | |
1da177e4 | 556 | |
22471cf6 DV |
557 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
558 | return 0; | |
559 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
560 | return 0; | |
561 | /* UMS was only ever support on pci devices. */ | |
562 | if (WARN_ON(!dev->pdev)) | |
563 | return -EINVAL; | |
1da177e4 | 564 | |
c153f45f | 565 | switch (ctl->func) { |
1da177e4 | 566 | case DRM_INST_HANDLER: |
a319c1a4 DV |
567 | irq = dev->pdev->irq; |
568 | ||
1da177e4 | 569 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 570 | ctl->irq != irq) |
1da177e4 | 571 | return -EINVAL; |
e090c53b | 572 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 573 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
574 | mutex_unlock(&dev->struct_mutex); |
575 | ||
576 | return ret; | |
1da177e4 | 577 | case DRM_UNINST_HANDLER: |
e090c53b DV |
578 | mutex_lock(&dev->struct_mutex); |
579 | ret = drm_irq_uninstall(dev); | |
580 | mutex_unlock(&dev->struct_mutex); | |
581 | ||
582 | return ret; | |
1da177e4 LT |
583 | default: |
584 | return -EINVAL; | |
585 | } | |
586 | } | |
587 | ||
27641c3f | 588 | /** |
f5752b38 DV |
589 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
590 | * @crtc: drm_crtc whose timestamp constants should be updated. | |
591 | * @mode: display mode containing the scanout timings | |
27641c3f | 592 | * |
21b21560 VS |
593 | * Calculate and store various constants which are later |
594 | * needed by vblank and swap-completion timestamping, e.g, | |
595 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
f5752b38 | 596 | * derived from CRTC's true scanout timing, so they take |
21b21560 | 597 | * things like panel scaling or other adjustments into account. |
27641c3f | 598 | */ |
545cdd55 VS |
599 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
600 | const struct drm_display_mode *mode) | |
27641c3f | 601 | { |
3c184f69 | 602 | int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; |
77666b72 | 603 | int dotclock = mode->crtc_clock; |
27641c3f MK |
604 | |
605 | /* Valid dotclock? */ | |
606 | if (dotclock > 0) { | |
0dae35a3 VS |
607 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
608 | ||
609 | /* | |
610 | * Convert scanline length in pixels and video | |
611 | * dot clock to line duration, frame duration | |
612 | * and pixel duration in nanoseconds: | |
27641c3f | 613 | */ |
0dae35a3 VS |
614 | pixeldur_ns = 1000000 / dotclock; |
615 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
616 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
617 | |
618 | /* | |
619 | * Fields of interlaced scanout modes are only half a frame duration. | |
620 | */ | |
621 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
622 | framedur_ns /= 2; | |
27641c3f MK |
623 | } else |
624 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", | |
625 | crtc->base.id); | |
626 | ||
627 | crtc->pixeldur_ns = pixeldur_ns; | |
628 | crtc->linedur_ns = linedur_ns; | |
629 | crtc->framedur_ns = framedur_ns; | |
630 | ||
631 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
545cdd55 VS |
632 | crtc->base.id, mode->crtc_htotal, |
633 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
27641c3f | 634 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", |
3c184f69 VS |
635 | crtc->base.id, dotclock, framedur_ns, |
636 | linedur_ns, pixeldur_ns); | |
27641c3f MK |
637 | } |
638 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
639 | ||
640 | /** | |
f5752b38 DV |
641 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
642 | * @dev: DRM device | |
643 | * @crtc: Which CRTC's vblank timestamp to retrieve | |
644 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) | |
645 | * On return contains true maximum error of timestamp | |
646 | * @vblank_time: Pointer to struct timeval which should receive the timestamp | |
647 | * @flags: Flags to pass to driver: | |
648 | * 0 = Default, | |
649 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
650 | * @refcrtc: CRTC which defines scanout timing | |
651 | * @mode: mode which defines the scanout timings | |
652 | * | |
653 | * Implements calculation of exact vblank timestamps from given drm_display_mode | |
654 | * timings and current video scanout position of a CRTC. This can be called from | |
655 | * within get_vblank_timestamp() implementation of a kms driver to implement the | |
656 | * actual timestamping. | |
27641c3f MK |
657 | * |
658 | * Should return timestamps conforming to the OML_sync_control OpenML | |
659 | * extension specification. The timestamp corresponds to the end of | |
660 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
661 | * pixel in the following video frame. | |
662 | * | |
663 | * Requires support for optional dev->driver->get_scanout_position() | |
664 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
665 | * that corresponds to the true scanout timing. | |
666 | * | |
667 | * The current implementation only handles standard video modes. It | |
668 | * returns as no operation if a doublescan or interlaced video mode is | |
669 | * active. Higher level code is expected to handle this. | |
670 | * | |
f5752b38 DV |
671 | * Returns: |
672 | * Negative value on error, failure or if not supported in current | |
27641c3f MK |
673 | * video mode: |
674 | * | |
f5752b38 | 675 | * -EINVAL - Invalid CRTC. |
27641c3f MK |
676 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
677 | * -ENOTSUPP - Function not supported in current display mode. | |
678 | * -EIO - Failed, e.g., due to failed scanout position query. | |
679 | * | |
680 | * Returns or'ed positive status flags on success: | |
681 | * | |
682 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
683 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
684 | * | |
685 | */ | |
686 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, | |
687 | int *max_error, | |
688 | struct timeval *vblank_time, | |
689 | unsigned flags, | |
7da903ef VS |
690 | const struct drm_crtc *refcrtc, |
691 | const struct drm_display_mode *mode) | |
27641c3f | 692 | { |
e62f2f5a | 693 | struct timeval tv_etime; |
d2cb58c8 | 694 | ktime_t stime, etime; |
8072bfa6 | 695 | int vbl_status; |
27641c3f | 696 | int vpos, hpos, i; |
3c184f69 | 697 | int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; |
27641c3f MK |
698 | bool invbl; |
699 | ||
700 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
701 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
702 | return -EINVAL; | |
703 | } | |
704 | ||
705 | /* Scanout position query not supported? Should not happen. */ | |
706 | if (!dev->driver->get_scanout_position) { | |
707 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
708 | return -EIO; | |
709 | } | |
710 | ||
27641c3f MK |
711 | /* Durations of frames, lines, pixels in nanoseconds. */ |
712 | framedur_ns = refcrtc->framedur_ns; | |
713 | linedur_ns = refcrtc->linedur_ns; | |
714 | pixeldur_ns = refcrtc->pixeldur_ns; | |
715 | ||
716 | /* If mode timing undefined, just return as no-op: | |
717 | * Happens during initial modesetting of a crtc. | |
718 | */ | |
8072bfa6 | 719 | if (framedur_ns == 0) { |
27641c3f MK |
720 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); |
721 | return -EAGAIN; | |
722 | } | |
723 | ||
27641c3f MK |
724 | /* Get current scanout position with system timestamp. |
725 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
726 | * if single query takes longer than max_error nanoseconds. | |
727 | * | |
728 | * This guarantees a tight bound on maximum error if | |
729 | * code gets preempted or delayed for some reason. | |
730 | */ | |
731 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
732 | /* |
733 | * Get vertical and horizontal scanout position vpos, hpos, | |
734 | * and bounding timestamps stime, etime, pre/post query. | |
735 | */ | |
abca9e45 | 736 | vbl_status = dev->driver->get_scanout_position(dev, crtc, flags, &vpos, |
8f6fce03 | 737 | &hpos, &stime, &etime); |
27641c3f | 738 | |
27641c3f MK |
739 | /* Return as no-op if scanout query unsupported or failed. */ |
740 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
741 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
742 | crtc, vbl_status); | |
743 | return -EIO; | |
744 | } | |
745 | ||
8f6fce03 | 746 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 747 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
748 | |
749 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 750 | if (duration_ns <= *max_error) |
27641c3f MK |
751 | break; |
752 | } | |
753 | ||
754 | /* Noisy system timing? */ | |
755 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
756 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
3c184f69 | 757 | crtc, duration_ns/1000, *max_error/1000, i); |
27641c3f MK |
758 | } |
759 | ||
760 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 761 | *max_error = duration_ns; |
27641c3f MK |
762 | |
763 | /* Check if in vblank area: | |
764 | * vpos is >=0 in video scanout area, but negative | |
765 | * within vblank area, counting down the number of lines until | |
766 | * start of scanout. | |
767 | */ | |
3d3cbd84 | 768 | invbl = vbl_status & DRM_SCANOUTPOS_IN_VBLANK; |
27641c3f MK |
769 | |
770 | /* Convert scanout position into elapsed time at raw_time query | |
771 | * since start of scanout at first display scanline. delta_ns | |
772 | * can be negative if start of scanout hasn't happened yet. | |
773 | */ | |
3c184f69 | 774 | delta_ns = vpos * linedur_ns + hpos * pixeldur_ns; |
27641c3f | 775 | |
c61eef72 | 776 | if (!drm_timestamp_monotonic) |
d2cb58c8 | 777 | etime = ktime_mono_to_real(etime); |
c61eef72 | 778 | |
e62f2f5a ID |
779 | /* save this only for debugging purposes */ |
780 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
781 | /* Subtract time delta from raw timestamp to get final |
782 | * vblank_time timestamp for end of vblank. | |
783 | */ | |
e91abf80 MD |
784 | if (delta_ns < 0) |
785 | etime = ktime_add_ns(etime, -delta_ns); | |
786 | else | |
787 | etime = ktime_sub_ns(etime, delta_ns); | |
e62f2f5a | 788 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 789 | |
bbb0aef5 JP |
790 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
791 | crtc, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 792 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 | 793 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
3c184f69 | 794 | duration_ns/1000, i); |
27641c3f MK |
795 | |
796 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
797 | if (invbl) | |
3d3cbd84 | 798 | vbl_status |= DRM_VBLANKTIME_IN_VBLANK; |
27641c3f MK |
799 | |
800 | return vbl_status; | |
801 | } | |
802 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
803 | ||
c61eef72 ID |
804 | static struct timeval get_drm_timestamp(void) |
805 | { | |
806 | ktime_t now; | |
807 | ||
d2cb58c8 | 808 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
c61eef72 ID |
809 | return ktime_to_timeval(now); |
810 | } | |
811 | ||
27641c3f MK |
812 | /** |
813 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
4dfd909f | 814 | * vblank interval |
27641c3f | 815 | * @dev: DRM device |
f5752b38 | 816 | * @crtc: which CRTC's vblank timestamp to retrieve |
27641c3f MK |
817 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
818 | * @flags: Flags to pass to driver: | |
f5752b38 DV |
819 | * 0 = Default, |
820 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler | |
27641c3f MK |
821 | * |
822 | * Fetches the system timestamp corresponding to the time of the most recent | |
f5752b38 | 823 | * vblank interval on specified CRTC. May call into kms-driver to |
27641c3f MK |
824 | * compute the timestamp with a high-precision GPU specific method. |
825 | * | |
826 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
827 | * call, i.e., it isn't very precisely locked to the true vblank. | |
828 | * | |
f5752b38 | 829 | * Returns: |
fb446a1a | 830 | * True if timestamp is considered to be very precise, false otherwise. |
27641c3f | 831 | */ |
fb446a1a DV |
832 | static bool |
833 | drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
834 | struct timeval *tvblank, unsigned flags) | |
27641c3f | 835 | { |
4a1b0714 | 836 | int ret; |
27641c3f MK |
837 | |
838 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
839 | int max_error = (int) drm_timestamp_precision * 1000; | |
840 | ||
841 | /* Query driver if possible and precision timestamping enabled. */ | |
842 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
843 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
844 | tvblank, flags); | |
845 | if (ret > 0) | |
fb446a1a | 846 | return true; |
27641c3f MK |
847 | } |
848 | ||
849 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 850 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 851 | */ |
c61eef72 | 852 | *tvblank = get_drm_timestamp(); |
27641c3f | 853 | |
fb446a1a | 854 | return false; |
27641c3f | 855 | } |
27641c3f | 856 | |
0a3e67a4 JB |
857 | /** |
858 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
859 | * @dev: DRM device | |
860 | * @crtc: which counter to retrieve | |
861 | * | |
862 | * Fetches the "cooked" vblank count value that represents the number of | |
863 | * vblank events since the system was booted, including lost events due to | |
864 | * modesetting activity. | |
f5752b38 | 865 | * |
96d3f91e TR |
866 | * This is the legacy version of drm_crtc_vblank_count(). |
867 | * | |
f5752b38 DV |
868 | * Returns: |
869 | * The software vblank counter. | |
0a3e67a4 JB |
870 | */ |
871 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
872 | { | |
8a51d5be VS |
873 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
874 | ||
e6ae8687 RC |
875 | if (WARN_ON(crtc >= dev->num_crtcs)) |
876 | return 0; | |
99264a61 | 877 | return vblank->count; |
0a3e67a4 JB |
878 | } |
879 | EXPORT_SYMBOL(drm_vblank_count); | |
880 | ||
96d3f91e TR |
881 | /** |
882 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value | |
883 | * @crtc: which counter to retrieve | |
884 | * | |
885 | * Fetches the "cooked" vblank count value that represents the number of | |
886 | * vblank events since the system was booted, including lost events due to | |
887 | * modesetting activity. | |
888 | * | |
889 | * This is the native KMS version of drm_vblank_count(). | |
890 | * | |
891 | * Returns: | |
892 | * The software vblank counter. | |
893 | */ | |
894 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) | |
895 | { | |
896 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); | |
897 | } | |
898 | EXPORT_SYMBOL(drm_crtc_vblank_count); | |
899 | ||
27641c3f MK |
900 | /** |
901 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
902 | * and the system timestamp corresponding to that vblank counter value. | |
903 | * | |
904 | * @dev: DRM device | |
905 | * @crtc: which counter to retrieve | |
906 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
907 | * | |
908 | * Fetches the "cooked" vblank count value that represents the number of | |
909 | * vblank events since the system was booted, including lost events due to | |
910 | * modesetting activity. Returns corresponding system timestamp of the time | |
f5752b38 | 911 | * of the vblank interval that corresponds to the current vblank counter value. |
27641c3f MK |
912 | */ |
913 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
914 | struct timeval *vblanktime) | |
915 | { | |
8a51d5be | 916 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
917 | u32 cur_vblank; |
918 | ||
e6ae8687 RC |
919 | if (WARN_ON(crtc >= dev->num_crtcs)) |
920 | return 0; | |
921 | ||
99264a61 DV |
922 | /* |
923 | * Vblank timestamps are read lockless. To ensure consistency the vblank | |
924 | * counter is rechecked and ordering is ensured using memory barriers. | |
925 | * This works like a seqlock. The write-side barriers are in store_vblank. | |
27641c3f MK |
926 | */ |
927 | do { | |
99264a61 DV |
928 | cur_vblank = vblank->count; |
929 | smp_rmb(); | |
27641c3f MK |
930 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); |
931 | smp_rmb(); | |
99264a61 | 932 | } while (cur_vblank != vblank->count); |
27641c3f MK |
933 | |
934 | return cur_vblank; | |
935 | } | |
936 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
937 | ||
c6eefa17 RC |
938 | static void send_vblank_event(struct drm_device *dev, |
939 | struct drm_pending_vblank_event *e, | |
940 | unsigned long seq, struct timeval *now) | |
941 | { | |
942 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
943 | e->event.sequence = seq; | |
944 | e->event.tv_sec = now->tv_sec; | |
945 | e->event.tv_usec = now->tv_usec; | |
946 | ||
947 | list_add_tail(&e->base.link, | |
948 | &e->base.file_priv->event_list); | |
949 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
950 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
951 | e->event.sequence); | |
952 | } | |
953 | ||
954 | /** | |
955 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
956 | * @dev: DRM device | |
957 | * @crtc: CRTC in question | |
958 | * @e: the event to send | |
959 | * | |
960 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
961 | * Caller must hold event lock. | |
a4d7b30d TR |
962 | * |
963 | * This is the legacy version of drm_crtc_send_vblank_event(). | |
c6eefa17 RC |
964 | */ |
965 | void drm_send_vblank_event(struct drm_device *dev, int crtc, | |
966 | struct drm_pending_vblank_event *e) | |
967 | { | |
968 | struct timeval now; | |
969 | unsigned int seq; | |
4dfd909f | 970 | |
c6eefa17 RC |
971 | if (crtc >= 0) { |
972 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
973 | } else { | |
974 | seq = 0; | |
c61eef72 ID |
975 | |
976 | now = get_drm_timestamp(); | |
c6eefa17 | 977 | } |
21a245d2 | 978 | e->pipe = crtc; |
c6eefa17 RC |
979 | send_vblank_event(dev, e, seq, &now); |
980 | } | |
981 | EXPORT_SYMBOL(drm_send_vblank_event); | |
982 | ||
a4d7b30d TR |
983 | /** |
984 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip | |
985 | * @crtc: the source CRTC of the vblank event | |
986 | * @e: the event to send | |
987 | * | |
988 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
989 | * Caller must hold event lock. | |
990 | * | |
991 | * This is the native KMS version of drm_send_vblank_event(). | |
992 | */ | |
993 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, | |
994 | struct drm_pending_vblank_event *e) | |
995 | { | |
996 | drm_send_vblank_event(crtc->dev, drm_crtc_index(crtc), e); | |
997 | } | |
998 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); | |
999 | ||
f2752282 VS |
1000 | /** |
1001 | * drm_vblank_enable - enable the vblank interrupt on a CRTC | |
1002 | * @dev: DRM device | |
1003 | * @crtc: CRTC in question | |
1004 | */ | |
1005 | static int drm_vblank_enable(struct drm_device *dev, int crtc) | |
1006 | { | |
8a51d5be | 1007 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f2752282 VS |
1008 | int ret = 0; |
1009 | ||
1010 | assert_spin_locked(&dev->vbl_lock); | |
1011 | ||
1012 | spin_lock(&dev->vblank_time_lock); | |
1013 | ||
8a51d5be | 1014 | if (!vblank->enabled) { |
1cfb80b1 DV |
1015 | /* |
1016 | * Enable vblank irqs under vblank_time_lock protection. | |
f2752282 VS |
1017 | * All vblank count & timestamp updates are held off |
1018 | * until we are done reinitializing master counter and | |
1019 | * timestamps. Filtercode in drm_handle_vblank() will | |
1020 | * prevent double-accounting of same vblank interval. | |
1021 | */ | |
1022 | ret = dev->driver->enable_vblank(dev, crtc); | |
1023 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); | |
1024 | if (ret) | |
8a51d5be | 1025 | atomic_dec(&vblank->refcount); |
f2752282 | 1026 | else { |
8a51d5be | 1027 | vblank->enabled = true; |
f2752282 VS |
1028 | drm_update_vblank_count(dev, crtc); |
1029 | } | |
1030 | } | |
1031 | ||
1032 | spin_unlock(&dev->vblank_time_lock); | |
1033 | ||
1034 | return ret; | |
1035 | } | |
1036 | ||
0a3e67a4 JB |
1037 | /** |
1038 | * drm_vblank_get - get a reference count on vblank events | |
1039 | * @dev: DRM device | |
1040 | * @crtc: which CRTC to own | |
1041 | * | |
1042 | * Acquire a reference count on vblank events to avoid having them disabled | |
1043 | * while in use. | |
1044 | * | |
89dd6a4b DV |
1045 | * This is the legacy version of drm_crtc_vblank_get(). |
1046 | * | |
f5752b38 | 1047 | * Returns: |
0a3e67a4 JB |
1048 | * Zero on success, nonzero on failure. |
1049 | */ | |
1050 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
1051 | { | |
8a51d5be | 1052 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
97cbc883 | 1053 | unsigned long irqflags; |
0a3e67a4 JB |
1054 | int ret = 0; |
1055 | ||
e6ae8687 RC |
1056 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1057 | return -EINVAL; | |
1058 | ||
0a3e67a4 JB |
1059 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1060 | /* Going from 0->1 means we have to enable interrupts again */ | |
8a51d5be | 1061 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
f2752282 | 1062 | ret = drm_vblank_enable(dev, crtc); |
778c9026 | 1063 | } else { |
8a51d5be VS |
1064 | if (!vblank->enabled) { |
1065 | atomic_dec(&vblank->refcount); | |
778c9026 | 1066 | ret = -EINVAL; |
0a3e67a4 JB |
1067 | } |
1068 | } | |
1069 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1070 | ||
1071 | return ret; | |
1072 | } | |
1073 | EXPORT_SYMBOL(drm_vblank_get); | |
1074 | ||
89dd6a4b DV |
1075 | /** |
1076 | * drm_crtc_vblank_get - get a reference count on vblank events | |
1077 | * @crtc: which CRTC to own | |
1078 | * | |
1079 | * Acquire a reference count on vblank events to avoid having them disabled | |
1080 | * while in use. | |
1081 | * | |
30b79f06 | 1082 | * This is the native kms version of drm_vblank_get(). |
89dd6a4b DV |
1083 | * |
1084 | * Returns: | |
1085 | * Zero on success, nonzero on failure. | |
1086 | */ | |
1087 | int drm_crtc_vblank_get(struct drm_crtc *crtc) | |
1088 | { | |
1089 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); | |
1090 | } | |
1091 | EXPORT_SYMBOL(drm_crtc_vblank_get); | |
1092 | ||
0a3e67a4 JB |
1093 | /** |
1094 | * drm_vblank_put - give up ownership of vblank events | |
1095 | * @dev: DRM device | |
1096 | * @crtc: which counter to give up | |
1097 | * | |
1098 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 1099 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
89dd6a4b DV |
1100 | * |
1101 | * This is the legacy version of drm_crtc_vblank_put(). | |
0a3e67a4 JB |
1102 | */ |
1103 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
1104 | { | |
8a51d5be VS |
1105 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
1106 | ||
7f907bf2 RC |
1107 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) |
1108 | return; | |
b3f5e732 | 1109 | |
e6ae8687 RC |
1110 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1111 | return; | |
1112 | ||
0a3e67a4 | 1113 | /* Last user schedules interrupt disable */ |
4ed0ce3d | 1114 | if (atomic_dec_and_test(&vblank->refcount)) { |
ab8905f1 DV |
1115 | if (drm_vblank_offdelay == 0) |
1116 | return; | |
1117 | else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0) | |
4ed0ce3d | 1118 | vblank_disable_fn((unsigned long)vblank); |
ab8905f1 | 1119 | else |
4ed0ce3d VS |
1120 | mod_timer(&vblank->disable_timer, |
1121 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); | |
1122 | } | |
0a3e67a4 JB |
1123 | } |
1124 | EXPORT_SYMBOL(drm_vblank_put); | |
1125 | ||
89dd6a4b DV |
1126 | /** |
1127 | * drm_crtc_vblank_put - give up ownership of vblank events | |
1128 | * @crtc: which counter to give up | |
1129 | * | |
1130 | * Release ownership of a given vblank counter, turning off interrupts | |
1131 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. | |
1132 | * | |
1133 | * This is the native kms version of drm_vblank_put(). | |
1134 | */ | |
1135 | void drm_crtc_vblank_put(struct drm_crtc *crtc) | |
1136 | { | |
1137 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); | |
1138 | } | |
1139 | EXPORT_SYMBOL(drm_crtc_vblank_put); | |
1140 | ||
e8450f51 DV |
1141 | /** |
1142 | * drm_wait_one_vblank - wait for one vblank | |
1143 | * @dev: DRM device | |
1144 | * @crtc: crtc index | |
1145 | * | |
1146 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1147 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1148 | * due to lack of driver support or because the crtc is off. | |
1149 | */ | |
1150 | void drm_wait_one_vblank(struct drm_device *dev, int crtc) | |
1151 | { | |
1152 | int ret; | |
1153 | u32 last; | |
1154 | ||
1155 | ret = drm_vblank_get(dev, crtc); | |
80c873b6 | 1156 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", crtc, ret)) |
e8450f51 DV |
1157 | return; |
1158 | ||
1159 | last = drm_vblank_count(dev, crtc); | |
1160 | ||
1161 | ret = wait_event_timeout(dev->vblank[crtc].queue, | |
1162 | last != drm_vblank_count(dev, crtc), | |
1163 | msecs_to_jiffies(100)); | |
1164 | ||
80c873b6 | 1165 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", crtc); |
e8450f51 DV |
1166 | |
1167 | drm_vblank_put(dev, crtc); | |
1168 | } | |
1169 | EXPORT_SYMBOL(drm_wait_one_vblank); | |
1170 | ||
1171 | /** | |
1172 | * drm_crtc_wait_one_vblank - wait for one vblank | |
1173 | * @crtc: DRM crtc | |
1174 | * | |
1175 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. | |
1176 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. | |
1177 | * due to lack of driver support or because the crtc is off. | |
1178 | */ | |
1179 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) | |
1180 | { | |
1181 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1182 | } | |
1183 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); | |
1184 | ||
c6eefa17 RC |
1185 | /** |
1186 | * drm_vblank_off - disable vblank events on a CRTC | |
1187 | * @dev: DRM device | |
1188 | * @crtc: CRTC in question | |
1189 | * | |
f5752b38 DV |
1190 | * Drivers can use this function to shut down the vblank interrupt handling when |
1191 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1192 | * stored so that drm_vblank_on() can restore it again. | |
1193 | * | |
1194 | * Drivers must use this function when the hardware vblank counter can get | |
1195 | * reset, e.g. when suspending. | |
89dd6a4b DV |
1196 | * |
1197 | * This is the legacy version of drm_crtc_vblank_off(). | |
c6eefa17 | 1198 | */ |
778c9026 LP |
1199 | void drm_vblank_off(struct drm_device *dev, int crtc) |
1200 | { | |
8a51d5be | 1201 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
498548ec CJHR |
1202 | struct drm_pending_vblank_event *e, *t; |
1203 | struct timeval now; | |
778c9026 | 1204 | unsigned long irqflags; |
498548ec | 1205 | unsigned int seq; |
778c9026 | 1206 | |
e6ae8687 RC |
1207 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1208 | return; | |
1209 | ||
56cc279b VS |
1210 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1211 | ||
1212 | spin_lock(&dev->vbl_lock); | |
27641c3f | 1213 | vblank_disable_and_save(dev, crtc); |
8a51d5be | 1214 | wake_up(&vblank->queue); |
498548ec | 1215 | |
56cc279b VS |
1216 | /* |
1217 | * Prevent subsequent drm_vblank_get() from re-enabling | |
1218 | * the vblank interrupt by bumping the refcount. | |
1219 | */ | |
1220 | if (!vblank->inmodeset) { | |
1221 | atomic_inc(&vblank->refcount); | |
1222 | vblank->inmodeset = 1; | |
1223 | } | |
1224 | spin_unlock(&dev->vbl_lock); | |
1225 | ||
498548ec CJHR |
1226 | /* Send any queued vblank events, lest the natives grow disquiet */ |
1227 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
e7783ba3 | 1228 | |
498548ec CJHR |
1229 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
1230 | if (e->pipe != crtc) | |
1231 | continue; | |
1232 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
1233 | wanted %d, current %d\n", | |
1234 | e->event.sequence, seq); | |
c6eefa17 | 1235 | list_del(&e->base.link); |
498548ec | 1236 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1237 | send_vblank_event(dev, e, seq, &now); |
498548ec | 1238 | } |
56cc279b | 1239 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
778c9026 LP |
1240 | } |
1241 | EXPORT_SYMBOL(drm_vblank_off); | |
1242 | ||
89dd6a4b DV |
1243 | /** |
1244 | * drm_crtc_vblank_off - disable vblank events on a CRTC | |
1245 | * @crtc: CRTC in question | |
1246 | * | |
1247 | * Drivers can use this function to shut down the vblank interrupt handling when | |
1248 | * disabling a crtc. This function ensures that the latest vblank frame count is | |
1249 | * stored so that drm_vblank_on can restore it again. | |
1250 | * | |
1251 | * Drivers must use this function when the hardware vblank counter can get | |
1252 | * reset, e.g. when suspending. | |
1253 | * | |
1254 | * This is the native kms version of drm_vblank_off(). | |
1255 | */ | |
1256 | void drm_crtc_vblank_off(struct drm_crtc *crtc) | |
1257 | { | |
1258 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); | |
1259 | } | |
1260 | EXPORT_SYMBOL(drm_crtc_vblank_off); | |
1261 | ||
9625604c DV |
1262 | /** |
1263 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC | |
1264 | * @crtc: CRTC in question | |
1265 | * | |
1266 | * Drivers can use this function to reset the vblank state to off at load time. | |
1267 | * Drivers should use this together with the drm_crtc_vblank_off() and | |
1268 | * drm_crtc_vblank_on() functions. The difference compared to | |
1269 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter | |
1270 | * and hence doesn't need to call any driver hooks. | |
1271 | */ | |
1272 | void drm_crtc_vblank_reset(struct drm_crtc *drm_crtc) | |
1273 | { | |
1274 | struct drm_device *dev = drm_crtc->dev; | |
1275 | unsigned long irqflags; | |
1276 | int crtc = drm_crtc_index(drm_crtc); | |
1277 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; | |
1278 | ||
1279 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
1280 | /* | |
1281 | * Prevent subsequent drm_vblank_get() from enabling the vblank | |
1282 | * interrupt by bumping the refcount. | |
1283 | */ | |
1284 | if (!vblank->inmodeset) { | |
1285 | atomic_inc(&vblank->refcount); | |
1286 | vblank->inmodeset = 1; | |
1287 | } | |
1288 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1289 | ||
1290 | WARN_ON(!list_empty(&dev->vblank_event_list)); | |
1291 | } | |
1292 | EXPORT_SYMBOL(drm_crtc_vblank_reset); | |
1293 | ||
f2752282 VS |
1294 | /** |
1295 | * drm_vblank_on - enable vblank events on a CRTC | |
1296 | * @dev: DRM device | |
1297 | * @crtc: CRTC in question | |
f5752b38 DV |
1298 | * |
1299 | * This functions restores the vblank interrupt state captured with | |
1300 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1301 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
f5752b38 | 1302 | * in driver load code to reflect the current hardware state of the crtc. |
89dd6a4b DV |
1303 | * |
1304 | * This is the legacy version of drm_crtc_vblank_on(). | |
f2752282 VS |
1305 | */ |
1306 | void drm_vblank_on(struct drm_device *dev, int crtc) | |
1307 | { | |
8a51d5be | 1308 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f2752282 VS |
1309 | unsigned long irqflags; |
1310 | ||
e6ae8687 RC |
1311 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1312 | return; | |
1313 | ||
f2752282 | 1314 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
7ffd7a68 | 1315 | /* Drop our private "prevent drm_vblank_get" refcount */ |
8a51d5be VS |
1316 | if (vblank->inmodeset) { |
1317 | atomic_dec(&vblank->refcount); | |
1318 | vblank->inmodeset = 0; | |
7ffd7a68 | 1319 | } |
f8ad028c VS |
1320 | |
1321 | /* | |
1322 | * sample the current counter to avoid random jumps | |
1323 | * when drm_vblank_enable() applies the diff | |
1324 | * | |
1325 | * -1 to make sure user will never see the same | |
1326 | * vblank counter value before and after a modeset | |
1327 | */ | |
8a51d5be | 1328 | vblank->last = |
f8ad028c VS |
1329 | (dev->driver->get_vblank_counter(dev, crtc) - 1) & |
1330 | dev->max_vblank_count; | |
cd19e52a VS |
1331 | /* |
1332 | * re-enable interrupts if there are users left, or the | |
1333 | * user wishes vblank interrupts to be enabled all the time. | |
1334 | */ | |
1335 | if (atomic_read(&vblank->refcount) != 0 || | |
1336 | (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0)) | |
f2752282 VS |
1337 | WARN_ON(drm_vblank_enable(dev, crtc)); |
1338 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
1339 | } | |
1340 | EXPORT_SYMBOL(drm_vblank_on); | |
1341 | ||
89dd6a4b DV |
1342 | /** |
1343 | * drm_crtc_vblank_on - enable vblank events on a CRTC | |
1344 | * @crtc: CRTC in question | |
1345 | * | |
1346 | * This functions restores the vblank interrupt state captured with | |
1347 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and | |
32197aab | 1348 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
89dd6a4b DV |
1349 | * in driver load code to reflect the current hardware state of the crtc. |
1350 | * | |
1351 | * This is the native kms version of drm_vblank_on(). | |
1352 | */ | |
1353 | void drm_crtc_vblank_on(struct drm_crtc *crtc) | |
1354 | { | |
1355 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); | |
1356 | } | |
1357 | EXPORT_SYMBOL(drm_crtc_vblank_on); | |
1358 | ||
f453ba04 DA |
1359 | /** |
1360 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
1361 | * @dev: DRM device | |
1362 | * @crtc: CRTC in question | |
f453ba04 DA |
1363 | * |
1364 | * Account for vblank events across mode setting events, which will likely | |
1365 | * reset the hardware frame counter. | |
f5752b38 DV |
1366 | * |
1367 | * This is done by grabbing a temporary vblank reference to ensure that the | |
1368 | * vblank interrupt keeps running across the modeset sequence. With this the | |
1369 | * software-side vblank frame counting will ensure that there are no jumps or | |
1370 | * discontinuities. | |
1371 | * | |
1372 | * Unfortunately this approach is racy and also doesn't work when the vblank | |
1373 | * interrupt stops running, e.g. across system suspend resume. It is therefore | |
1374 | * highly recommended that drivers use the newer drm_vblank_off() and | |
1375 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when | |
1376 | * using "cooked" software vblank frame counters and not relying on any hardware | |
1377 | * counters. | |
1378 | * | |
1379 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc | |
1380 | * again. | |
f453ba04 DA |
1381 | */ |
1382 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
1383 | { | |
8a51d5be VS |
1384 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
1385 | ||
b7ea85a4 | 1386 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
1387 | if (!dev->num_crtcs) |
1388 | return; | |
e6ae8687 RC |
1389 | |
1390 | if (WARN_ON(crtc >= dev->num_crtcs)) | |
1391 | return; | |
1392 | ||
f453ba04 DA |
1393 | /* |
1394 | * To avoid all the problems that might happen if interrupts | |
1395 | * were enabled/disabled around or between these calls, we just | |
1396 | * have the kernel take a reference on the CRTC (just once though | |
1397 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
1398 | * so that interrupts remain enabled in the interim. | |
1399 | */ | |
8a51d5be VS |
1400 | if (!vblank->inmodeset) { |
1401 | vblank->inmodeset = 0x1; | |
b3f5e732 | 1402 | if (drm_vblank_get(dev, crtc) == 0) |
8a51d5be | 1403 | vblank->inmodeset |= 0x2; |
f453ba04 DA |
1404 | } |
1405 | } | |
1406 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
1407 | ||
f5752b38 DV |
1408 | /** |
1409 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes | |
1410 | * @dev: DRM device | |
1411 | * @crtc: CRTC in question | |
1412 | * | |
1413 | * This function again drops the temporary vblank reference acquired in | |
1414 | * drm_vblank_pre_modeset. | |
1415 | */ | |
f453ba04 DA |
1416 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) |
1417 | { | |
8a51d5be | 1418 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
f453ba04 DA |
1419 | unsigned long irqflags; |
1420 | ||
b7ea85a4 HC |
1421 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1422 | if (!dev->num_crtcs) | |
1423 | return; | |
1424 | ||
8a51d5be | 1425 | if (vblank->inmodeset) { |
f453ba04 | 1426 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
ba0bf120 | 1427 | dev->vblank_disable_allowed = true; |
f453ba04 | 1428 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 1429 | |
8a51d5be | 1430 | if (vblank->inmodeset & 0x2) |
b3f5e732 CW |
1431 | drm_vblank_put(dev, crtc); |
1432 | ||
8a51d5be | 1433 | vblank->inmodeset = 0; |
f453ba04 DA |
1434 | } |
1435 | } | |
1436 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
1437 | ||
f5752b38 | 1438 | /* |
0a3e67a4 JB |
1439 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
1440 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
1441 | * | |
1442 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1443 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1444 | * | |
1445 | * Generally the counter will reset across mode sets. If interrupts are | |
1446 | * enabled around this call, we don't have to do anything since the counter | |
1447 | * will have already been incremented. | |
1448 | */ | |
1449 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1450 | struct drm_file *file_priv) | |
1451 | { | |
1452 | struct drm_modeset_ctl *modeset = data; | |
19227561 | 1453 | unsigned int crtc; |
0a3e67a4 JB |
1454 | |
1455 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1456 | if (!dev->num_crtcs) | |
4a1b0714 | 1457 | return 0; |
0a3e67a4 | 1458 | |
29935554 LP |
1459 | /* KMS drivers handle this internally */ |
1460 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1461 | return 0; | |
1462 | ||
0a3e67a4 | 1463 | crtc = modeset->crtc; |
4a1b0714 LP |
1464 | if (crtc >= dev->num_crtcs) |
1465 | return -EINVAL; | |
0a3e67a4 | 1466 | |
0a3e67a4 JB |
1467 | switch (modeset->cmd) { |
1468 | case _DRM_PRE_MODESET: | |
f453ba04 | 1469 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1470 | break; |
1471 | case _DRM_POST_MODESET: | |
f453ba04 | 1472 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1473 | break; |
1474 | default: | |
4a1b0714 | 1475 | return -EINVAL; |
0a3e67a4 JB |
1476 | } |
1477 | ||
4a1b0714 | 1478 | return 0; |
0a3e67a4 JB |
1479 | } |
1480 | ||
c9a9c5e0 KH |
1481 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1482 | union drm_wait_vblank *vblwait, | |
1483 | struct drm_file *file_priv) | |
1484 | { | |
ffe7c73a | 1485 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
c9a9c5e0 KH |
1486 | struct drm_pending_vblank_event *e; |
1487 | struct timeval now; | |
1488 | unsigned long flags; | |
1489 | unsigned int seq; | |
ea5d552c | 1490 | int ret; |
c9a9c5e0 | 1491 | |
f76511b9 | 1492 | e = kzalloc(sizeof(*e), GFP_KERNEL); |
ea5d552c CW |
1493 | if (e == NULL) { |
1494 | ret = -ENOMEM; | |
1495 | goto err_put; | |
1496 | } | |
c9a9c5e0 KH |
1497 | |
1498 | e->pipe = pipe; | |
b9c2c9ae | 1499 | e->base.pid = current->pid; |
c9a9c5e0 | 1500 | e->event.base.type = DRM_EVENT_VBLANK; |
f76511b9 | 1501 | e->event.base.length = sizeof(e->event); |
c9a9c5e0 KH |
1502 | e->event.user_data = vblwait->request.signal; |
1503 | e->base.event = &e->event.base; | |
1504 | e->base.file_priv = file_priv; | |
1505 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1506 | ||
c9a9c5e0 KH |
1507 | spin_lock_irqsave(&dev->event_lock, flags); |
1508 | ||
ffe7c73a VS |
1509 | /* |
1510 | * drm_vblank_off() might have been called after we called | |
1511 | * drm_vblank_get(). drm_vblank_off() holds event_lock | |
1512 | * around the vblank disable, so no need for further locking. | |
1513 | * The reference from drm_vblank_get() protects against | |
1514 | * vblank disable from another source. | |
1515 | */ | |
1516 | if (!vblank->enabled) { | |
1517 | ret = -EINVAL; | |
1518 | goto err_unlock; | |
1519 | } | |
1520 | ||
f76511b9 | 1521 | if (file_priv->event_space < sizeof(e->event)) { |
ea5d552c CW |
1522 | ret = -EBUSY; |
1523 | goto err_unlock; | |
c9a9c5e0 KH |
1524 | } |
1525 | ||
f76511b9 | 1526 | file_priv->event_space -= sizeof(e->event); |
27641c3f MK |
1527 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1528 | ||
c9a9c5e0 KH |
1529 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1530 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1531 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1532 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1533 | } |
1534 | ||
1535 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1536 | vblwait->request.sequence, seq, pipe); | |
1537 | ||
b9c2c9ae JB |
1538 | trace_drm_vblank_event_queued(current->pid, pipe, |
1539 | vblwait->request.sequence); | |
1540 | ||
c9a9c5e0 KH |
1541 | e->event.sequence = vblwait->request.sequence; |
1542 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1543 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1544 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1545 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1546 | } else { |
a6778e9e | 1547 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1548 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1549 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1550 | } |
1551 | ||
1552 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1553 | ||
1554 | return 0; | |
ea5d552c CW |
1555 | |
1556 | err_unlock: | |
1557 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1558 | kfree(e); | |
1559 | err_put: | |
6f331623 | 1560 | drm_vblank_put(dev, pipe); |
ea5d552c | 1561 | return ret; |
c9a9c5e0 KH |
1562 | } |
1563 | ||
f5752b38 | 1564 | /* |
1da177e4 LT |
1565 | * Wait for VBLANK. |
1566 | * | |
1567 | * \param inode device inode. | |
6c340eac | 1568 | * \param file_priv DRM file private. |
1da177e4 LT |
1569 | * \param cmd command. |
1570 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1571 | * \return zero on success or a negative number on failure. | |
1572 | * | |
30b23634 EA |
1573 | * This function enables the vblank interrupt on the pipe requested, then |
1574 | * sleeps waiting for the requested sequence number to occur, and drops | |
f5752b38 | 1575 | * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that |
30b23634 | 1576 | * after a timeout with no further vblank waits scheduled). |
1da177e4 | 1577 | */ |
0a3e67a4 JB |
1578 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1579 | struct drm_file *file_priv) | |
1da177e4 | 1580 | { |
8a51d5be | 1581 | struct drm_vblank_crtc *vblank; |
c153f45f | 1582 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1583 | int ret; |
19b01b5f | 1584 | unsigned int flags, seq, crtc, high_crtc; |
1da177e4 | 1585 | |
4984979b DV |
1586 | if (!dev->irq_enabled) |
1587 | return -EINVAL; | |
1da177e4 | 1588 | |
30b23634 EA |
1589 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1590 | return -EINVAL; | |
1591 | ||
c153f45f | 1592 | if (vblwait->request.type & |
19b01b5f IH |
1593 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1594 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1595 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1596 | vblwait->request.type, |
19b01b5f IH |
1597 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1598 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MCA |
1599 | return -EINVAL; |
1600 | } | |
1601 | ||
c153f45f | 1602 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
19b01b5f IH |
1603 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1604 | if (high_crtc) | |
1605 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1606 | else | |
1607 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
0a3e67a4 | 1608 | if (crtc >= dev->num_crtcs) |
776c9443 MCA |
1609 | return -EINVAL; |
1610 | ||
8a51d5be VS |
1611 | vblank = &dev->vblank[crtc]; |
1612 | ||
0a3e67a4 JB |
1613 | ret = drm_vblank_get(dev, crtc); |
1614 | if (ret) { | |
8d3457ec | 1615 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1616 | return ret; |
1617 | } | |
1618 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1619 | |
c153f45f | 1620 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1621 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1622 | vblwait->request.sequence += seq; |
1623 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1624 | case _DRM_VBLANK_ABSOLUTE: |
1625 | break; | |
1626 | default: | |
0a3e67a4 JB |
1627 | ret = -EINVAL; |
1628 | goto done; | |
1da177e4 LT |
1629 | } |
1630 | ||
a6778e9e IH |
1631 | if (flags & _DRM_VBLANK_EVENT) { |
1632 | /* must hold on to the vblank ref until the event fires | |
1633 | * drm_vblank_put will be called asynchronously | |
1634 | */ | |
c9a9c5e0 | 1635 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); |
a6778e9e | 1636 | } |
c9a9c5e0 | 1637 | |
ab285d74 | 1638 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1639 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1640 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
1641 | } |
1642 | ||
30b23634 EA |
1643 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1644 | vblwait->request.sequence, crtc); | |
8a51d5be VS |
1645 | vblank->last_wait = vblwait->request.sequence; |
1646 | DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, | |
30b23634 EA |
1647 | (((drm_vblank_count(dev, crtc) - |
1648 | vblwait->request.sequence) <= (1 << 23)) || | |
8a51d5be | 1649 | !vblank->enabled || |
30b23634 | 1650 | !dev->irq_enabled)); |
1da177e4 | 1651 | |
30b23634 EA |
1652 | if (ret != -EINTR) { |
1653 | struct timeval now; | |
1da177e4 | 1654 | |
27641c3f | 1655 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1656 | vblwait->reply.tval_sec = now.tv_sec; |
1657 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1658 | |
30b23634 EA |
1659 | DRM_DEBUG("returning %d to client\n", |
1660 | vblwait->reply.sequence); | |
1da177e4 | 1661 | } else { |
30b23634 | 1662 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1663 | } |
1664 | ||
0a3e67a4 JB |
1665 | done: |
1666 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1667 | return ret; |
1668 | } | |
1669 | ||
ea7f7abc | 1670 | static void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
c9a9c5e0 KH |
1671 | { |
1672 | struct drm_pending_vblank_event *e, *t; | |
1673 | struct timeval now; | |
c9a9c5e0 KH |
1674 | unsigned int seq; |
1675 | ||
56cc279b | 1676 | assert_spin_locked(&dev->event_lock); |
c9a9c5e0 | 1677 | |
56cc279b | 1678 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1679 | |
1680 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1681 | if (e->pipe != crtc) | |
1682 | continue; | |
1683 | if ((seq - e->event.sequence) > (1<<23)) | |
1684 | continue; | |
1685 | ||
1686 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1687 | e->event.sequence, seq); | |
1688 | ||
c6eefa17 | 1689 | list_del(&e->base.link); |
c9a9c5e0 | 1690 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1691 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1692 | } |
1693 | ||
ac2874b9 | 1694 | trace_drm_vblank_event(crtc, seq); |
c9a9c5e0 KH |
1695 | } |
1696 | ||
0a3e67a4 JB |
1697 | /** |
1698 | * drm_handle_vblank - handle a vblank event | |
1699 | * @dev: DRM device | |
1700 | * @crtc: where this event occurred | |
1701 | * | |
1702 | * Drivers should call this routine in their vblank interrupt handlers to | |
1703 | * update the vblank counter and send any signals that may be pending. | |
115ebcd4 TR |
1704 | * |
1705 | * This is the legacy version of drm_crtc_handle_vblank(). | |
0a3e67a4 | 1706 | */ |
78c6e170 | 1707 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1708 | { |
8a51d5be | 1709 | struct drm_vblank_crtc *vblank = &dev->vblank[crtc]; |
27641c3f MK |
1710 | u32 vblcount; |
1711 | s64 diff_ns; | |
1712 | struct timeval tvblank; | |
1713 | unsigned long irqflags; | |
1714 | ||
ee3c7795 | 1715 | if (WARN_ON_ONCE(!dev->num_crtcs)) |
78c6e170 | 1716 | return false; |
c9a9c5e0 | 1717 | |
e6ae8687 RC |
1718 | if (WARN_ON(crtc >= dev->num_crtcs)) |
1719 | return false; | |
1720 | ||
56cc279b VS |
1721 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1722 | ||
27641c3f MK |
1723 | /* Need timestamp lock to prevent concurrent execution with |
1724 | * vblank enable/disable, as this would cause inconsistent | |
1725 | * or corrupted timestamps and vblank counts. | |
1726 | */ | |
56cc279b | 1727 | spin_lock(&dev->vblank_time_lock); |
27641c3f MK |
1728 | |
1729 | /* Vblank irq handling disabled. Nothing to do. */ | |
8a51d5be | 1730 | if (!vblank->enabled) { |
56cc279b VS |
1731 | spin_unlock(&dev->vblank_time_lock); |
1732 | spin_unlock_irqrestore(&dev->event_lock, irqflags); | |
78c6e170 | 1733 | return false; |
27641c3f MK |
1734 | } |
1735 | ||
1736 | /* Fetch corresponding timestamp for this vblank interval from | |
1737 | * driver and store it in proper slot of timestamp ringbuffer. | |
1738 | */ | |
1739 | ||
1740 | /* Get current timestamp and count. */ | |
99264a61 | 1741 | vblcount = vblank->count; |
27641c3f MK |
1742 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); |
1743 | ||
1744 | /* Compute time difference to timestamp of last vblank */ | |
1745 | diff_ns = timeval_to_ns(&tvblank) - | |
1746 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1747 | ||
1748 | /* Update vblank timestamp and count if at least | |
1749 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1750 | * difference between last stored timestamp and current | |
1751 | * timestamp. A smaller difference means basically | |
1752 | * identical timestamps. Happens if this vblank has | |
1753 | * been already processed and this is a redundant call, | |
1754 | * e.g., due to spurious vblank interrupts. We need to | |
1755 | * ignore those for accounting. | |
1756 | */ | |
99264a61 DV |
1757 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) |
1758 | store_vblank(dev, crtc, 1, &tvblank); | |
1759 | else | |
27641c3f MK |
1760 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", |
1761 | crtc, (int) diff_ns); | |
27641c3f | 1762 | |
56cc279b VS |
1763 | spin_unlock(&dev->vblank_time_lock); |
1764 | ||
8a51d5be | 1765 | wake_up(&vblank->queue); |
c9a9c5e0 | 1766 | drm_handle_vblank_events(dev, crtc); |
27641c3f | 1767 | |
56cc279b VS |
1768 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
1769 | ||
78c6e170 | 1770 | return true; |
0a3e67a4 JB |
1771 | } |
1772 | EXPORT_SYMBOL(drm_handle_vblank); | |
115ebcd4 TR |
1773 | |
1774 | /** | |
1775 | * drm_crtc_handle_vblank - handle a vblank event | |
1776 | * @crtc: where this event occurred | |
1777 | * | |
1778 | * Drivers should call this routine in their vblank interrupt handlers to | |
1779 | * update the vblank counter and send any signals that may be pending. | |
1780 | * | |
1781 | * This is the native KMS version of drm_handle_vblank(). | |
1782 | * | |
1783 | * Returns: | |
1784 | * True if the event was successfully handled, false on failure. | |
1785 | */ | |
1786 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) | |
1787 | { | |
1788 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); | |
1789 | } | |
1790 | EXPORT_SYMBOL(drm_crtc_handle_vblank); |