Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_irq.c |
1da177e4 LT |
3 | * IRQ support |
4 | * | |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
6 | * \author Gareth Hughes <gareth@valinux.com> | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com | |
11 | * | |
12 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
14 | * All Rights Reserved. | |
15 | * | |
16 | * Permission is hereby granted, free of charge, to any person obtaining a | |
17 | * copy of this software and associated documentation files (the "Software"), | |
18 | * to deal in the Software without restriction, including without limitation | |
19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
20 | * and/or sell copies of the Software, and to permit persons to whom the | |
21 | * Software is furnished to do so, subject to the following conditions: | |
22 | * | |
23 | * The above copyright notice and this permission notice (including the next | |
24 | * paragraph) shall be included in all copies or substantial portions of the | |
25 | * Software. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
28 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
29 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
30 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
31 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
32 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
33 | * OTHER DEALINGS IN THE SOFTWARE. | |
34 | */ | |
35 | ||
760285e7 | 36 | #include <drm/drmP.h> |
ac2874b9 | 37 | #include "drm_trace.h" |
1da177e4 LT |
38 | |
39 | #include <linux/interrupt.h> /* For task queue support */ | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
1da177e4 | 41 | |
28d52043 | 42 | #include <linux/vgaarb.h> |
2d1a8a48 | 43 | #include <linux/export.h> |
27641c3f MK |
44 | |
45 | /* Access macro for slots in vblank timestamp ringbuffer. */ | |
5380e929 VS |
46 | #define vblanktimestamp(dev, crtc, count) \ |
47 | ((dev)->vblank[crtc].time[(count) % DRM_VBLANKTIME_RBSIZE]) | |
27641c3f MK |
48 | |
49 | /* Retry timestamp calculation up to 3 times to satisfy | |
50 | * drm_timestamp_precision before giving up. | |
51 | */ | |
52 | #define DRM_TIMESTAMP_MAXRETRIES 3 | |
53 | ||
54 | /* Threshold in nanoseconds for detection of redundant | |
55 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. | |
56 | */ | |
57 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 | |
58 | ||
27641c3f MK |
59 | /* |
60 | * Clear vblank timestamp buffer for a crtc. | |
61 | */ | |
62 | static void clear_vblank_timestamps(struct drm_device *dev, int crtc) | |
63 | { | |
5380e929 | 64 | memset(dev->vblank[crtc].time, 0, sizeof(dev->vblank[crtc].time)); |
27641c3f MK |
65 | } |
66 | ||
67 | /* | |
68 | * Disable vblank irq's on crtc, make sure that last vblank count | |
69 | * of hardware and corresponding consistent software vblank counter | |
70 | * are preserved, even if there are any spurious vblank irq's after | |
71 | * disable. | |
72 | */ | |
73 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) | |
74 | { | |
75 | unsigned long irqflags; | |
76 | u32 vblcount; | |
77 | s64 diff_ns; | |
78 | int vblrc; | |
79 | struct timeval tvblank; | |
0355cf3a | 80 | int count = DRM_TIMESTAMP_MAXRETRIES; |
27641c3f MK |
81 | |
82 | /* Prevent vblank irq processing while disabling vblank irqs, | |
83 | * so no updates of timestamps or count can happen after we've | |
84 | * disabled. Needed to prevent races in case of delayed irq's. | |
27641c3f | 85 | */ |
27641c3f MK |
86 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
87 | ||
88 | dev->driver->disable_vblank(dev, crtc); | |
5380e929 | 89 | dev->vblank[crtc].enabled = false; |
27641c3f MK |
90 | |
91 | /* No further vblank irq's will be processed after | |
92 | * this point. Get current hardware vblank count and | |
93 | * vblank timestamp, repeat until they are consistent. | |
94 | * | |
95 | * FIXME: There is still a race condition here and in | |
96 | * drm_update_vblank_count() which can cause off-by-one | |
97 | * reinitialization of software vblank counter. If gpu | |
98 | * vblank counter doesn't increment exactly at the leading | |
99 | * edge of a vblank interval, then we can lose 1 count if | |
100 | * we happen to execute between start of vblank and the | |
101 | * delayed gpu counter increment. | |
102 | */ | |
103 | do { | |
5380e929 | 104 | dev->vblank[crtc].last = dev->driver->get_vblank_counter(dev, crtc); |
27641c3f | 105 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); |
5380e929 | 106 | } while (dev->vblank[crtc].last != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc); |
0355cf3a EE |
107 | |
108 | if (!count) | |
109 | vblrc = 0; | |
27641c3f MK |
110 | |
111 | /* Compute time difference to stored timestamp of last vblank | |
112 | * as updated by last invocation of drm_handle_vblank() in vblank irq. | |
113 | */ | |
5380e929 | 114 | vblcount = atomic_read(&dev->vblank[crtc].count); |
27641c3f MK |
115 | diff_ns = timeval_to_ns(&tvblank) - |
116 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
117 | ||
118 | /* If there is at least 1 msec difference between the last stored | |
119 | * timestamp and tvblank, then we are currently executing our | |
120 | * disable inside a new vblank interval, the tvblank timestamp | |
121 | * corresponds to this new vblank interval and the irq handler | |
122 | * for this vblank didn't run yet and won't run due to our disable. | |
123 | * Therefore we need to do the job of drm_handle_vblank() and | |
124 | * increment the vblank counter by one to account for this vblank. | |
125 | * | |
126 | * Skip this step if there isn't any high precision timestamp | |
127 | * available. In that case we can't account for this and just | |
128 | * hope for the best. | |
129 | */ | |
bc215128 | 130 | if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) { |
5380e929 | 131 | atomic_inc(&dev->vblank[crtc].count); |
bc215128 MK |
132 | smp_mb__after_atomic_inc(); |
133 | } | |
27641c3f MK |
134 | |
135 | /* Invalidate all timestamps while vblank irq's are off. */ | |
136 | clear_vblank_timestamps(dev, crtc); | |
137 | ||
138 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
27641c3f MK |
139 | } |
140 | ||
0a3e67a4 JB |
141 | static void vblank_disable_fn(unsigned long arg) |
142 | { | |
143 | struct drm_device *dev = (struct drm_device *)arg; | |
144 | unsigned long irqflags; | |
145 | int i; | |
146 | ||
147 | if (!dev->vblank_disable_allowed) | |
148 | return; | |
149 | ||
150 | for (i = 0; i < dev->num_crtcs; i++) { | |
151 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
5380e929 VS |
152 | if (atomic_read(&dev->vblank[i].refcount) == 0 && |
153 | dev->vblank[i].enabled) { | |
0a3e67a4 | 154 | DRM_DEBUG("disabling vblank on crtc %d\n", i); |
27641c3f | 155 | vblank_disable_and_save(dev, i); |
0a3e67a4 JB |
156 | } |
157 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
158 | } | |
159 | } | |
160 | ||
52440211 | 161 | void drm_vblank_cleanup(struct drm_device *dev) |
0a3e67a4 JB |
162 | { |
163 | /* Bail if the driver didn't call drm_vblank_init() */ | |
164 | if (dev->num_crtcs == 0) | |
165 | return; | |
166 | ||
7eb3b2c8 | 167 | del_timer_sync(&dev->vblank_disable_timer); |
0a3e67a4 JB |
168 | |
169 | vblank_disable_fn((unsigned long)dev); | |
170 | ||
5380e929 | 171 | kfree(dev->vblank); |
0a3e67a4 JB |
172 | |
173 | dev->num_crtcs = 0; | |
174 | } | |
e77cef9c | 175 | EXPORT_SYMBOL(drm_vblank_cleanup); |
0a3e67a4 JB |
176 | |
177 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) | |
178 | { | |
179 | int i, ret = -ENOMEM; | |
180 | ||
181 | setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, | |
182 | (unsigned long)dev); | |
183 | spin_lock_init(&dev->vbl_lock); | |
27641c3f MK |
184 | spin_lock_init(&dev->vblank_time_lock); |
185 | ||
0a3e67a4 JB |
186 | dev->num_crtcs = num_crtcs; |
187 | ||
5380e929 VS |
188 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
189 | if (!dev->vblank) | |
0a3e67a4 JB |
190 | goto err; |
191 | ||
5380e929 VS |
192 | for (i = 0; i < num_crtcs; i++) |
193 | init_waitqueue_head(&dev->vblank[i].queue); | |
27641c3f | 194 | |
8f6fce03 | 195 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
27641c3f MK |
196 | |
197 | /* Driver specific high-precision vblank timestamping supported? */ | |
198 | if (dev->driver->get_vblank_timestamp) | |
199 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); | |
200 | else | |
201 | DRM_INFO("No driver support for vblank timestamp query.\n"); | |
202 | ||
ba0bf120 VS |
203 | dev->vblank_disable_allowed = false; |
204 | ||
0a3e67a4 JB |
205 | return 0; |
206 | ||
207 | err: | |
208 | drm_vblank_cleanup(dev); | |
209 | return ret; | |
210 | } | |
211 | EXPORT_SYMBOL(drm_vblank_init); | |
212 | ||
28d52043 DA |
213 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
214 | { | |
215 | struct drm_device *dev = cookie; | |
216 | ||
217 | if (dev->driver->vgaarb_irq) { | |
218 | dev->driver->vgaarb_irq(dev, state); | |
219 | return; | |
220 | } | |
221 | ||
222 | if (!dev->irq_enabled) | |
223 | return; | |
224 | ||
5037f8ac JS |
225 | if (state) { |
226 | if (dev->driver->irq_uninstall) | |
227 | dev->driver->irq_uninstall(dev); | |
228 | } else { | |
229 | if (dev->driver->irq_preinstall) | |
230 | dev->driver->irq_preinstall(dev); | |
231 | if (dev->driver->irq_postinstall) | |
232 | dev->driver->irq_postinstall(dev); | |
28d52043 DA |
233 | } |
234 | } | |
235 | ||
1da177e4 LT |
236 | /** |
237 | * Install IRQ handler. | |
238 | * | |
239 | * \param dev DRM device. | |
1da177e4 | 240 | * |
0a3e67a4 | 241 | * Initializes the IRQ related data. Installs the handler, calling the driver |
884a53ef | 242 | * \c irq_preinstall() and \c irq_postinstall() functions |
1da177e4 LT |
243 | * before and after the installation. |
244 | */ | |
bb0f1b5c | 245 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 246 | { |
bb0f1b5c | 247 | int ret; |
b5e89ed5 | 248 | unsigned long sh_flags = 0; |
1da177e4 LT |
249 | |
250 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
251 | return -EINVAL; | |
252 | ||
7c1a38e3 | 253 | if (irq == 0) |
1da177e4 LT |
254 | return -EINVAL; |
255 | ||
1da177e4 | 256 | /* Driver must have been initialized */ |
e090c53b | 257 | if (!dev->dev_private) |
1da177e4 | 258 | return -EINVAL; |
1da177e4 | 259 | |
e090c53b | 260 | if (dev->irq_enabled) |
1da177e4 | 261 | return -EBUSY; |
4423843c | 262 | dev->irq_enabled = true; |
1da177e4 | 263 | |
7c1a38e3 | 264 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 265 | |
b5e89ed5 | 266 | /* Before installing handler */ |
5037f8ac JS |
267 | if (dev->driver->irq_preinstall) |
268 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 269 | |
b5e89ed5 | 270 | /* Install handler */ |
1da177e4 | 271 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
935f6e3a | 272 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 273 | |
7c1a38e3 | 274 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 275 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 276 | |
b5e89ed5 | 277 | if (ret < 0) { |
4423843c | 278 | dev->irq_enabled = false; |
1da177e4 LT |
279 | return ret; |
280 | } | |
281 | ||
28d52043 DA |
282 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
283 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); | |
284 | ||
b5e89ed5 | 285 | /* After installing handler */ |
5037f8ac JS |
286 | if (dev->driver->irq_postinstall) |
287 | ret = dev->driver->irq_postinstall(dev); | |
288 | ||
0a3e67a4 | 289 | if (ret < 0) { |
4423843c | 290 | dev->irq_enabled = false; |
e1c44acc JS |
291 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
292 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
7c1a38e3 DV |
293 | free_irq(irq, dev); |
294 | } else { | |
295 | dev->irq = irq; | |
0a3e67a4 | 296 | } |
1da177e4 | 297 | |
0a3e67a4 | 298 | return ret; |
1da177e4 | 299 | } |
0a3e67a4 | 300 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
301 | |
302 | /** | |
303 | * Uninstall the IRQ handler. | |
304 | * | |
305 | * \param dev DRM device. | |
306 | * | |
884a53ef | 307 | * Calls the driver's \c irq_uninstall() function, and stops the irq. |
1da177e4 | 308 | */ |
27641c3f | 309 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 310 | { |
dc1336ff | 311 | unsigned long irqflags; |
4423843c VS |
312 | bool irq_enabled; |
313 | int i; | |
1da177e4 LT |
314 | |
315 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
316 | return -EINVAL; | |
317 | ||
1da177e4 | 318 | irq_enabled = dev->irq_enabled; |
4423843c | 319 | dev->irq_enabled = false; |
1da177e4 | 320 | |
dc1336ff JB |
321 | /* |
322 | * Wake up any waiters so they don't hang. | |
323 | */ | |
bde4889a BS |
324 | if (dev->num_crtcs) { |
325 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
326 | for (i = 0; i < dev->num_crtcs; i++) { | |
57ed0f7b | 327 | wake_up(&dev->vblank[i].queue); |
5380e929 VS |
328 | dev->vblank[i].enabled = false; |
329 | dev->vblank[i].last = | |
bde4889a BS |
330 | dev->driver->get_vblank_counter(dev, i); |
331 | } | |
332 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 333 | } |
dc1336ff | 334 | |
b5e89ed5 | 335 | if (!irq_enabled) |
1da177e4 LT |
336 | return -EINVAL; |
337 | ||
7c1a38e3 | 338 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 339 | |
28d52043 DA |
340 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
341 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
342 | ||
5037f8ac JS |
343 | if (dev->driver->irq_uninstall) |
344 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 345 | |
7c1a38e3 | 346 | free_irq(dev->irq, dev); |
1da177e4 LT |
347 | |
348 | return 0; | |
349 | } | |
350 | EXPORT_SYMBOL(drm_irq_uninstall); | |
351 | ||
352 | /** | |
353 | * IRQ control ioctl. | |
354 | * | |
355 | * \param inode device inode. | |
6c340eac | 356 | * \param file_priv DRM file private. |
1da177e4 LT |
357 | * \param cmd command. |
358 | * \param arg user argument, pointing to a drm_control structure. | |
359 | * \return zero on success or a negative number on failure. | |
360 | * | |
361 | * Calls irq_install() or irq_uninstall() according to \p arg. | |
362 | */ | |
c153f45f EA |
363 | int drm_control(struct drm_device *dev, void *data, |
364 | struct drm_file *file_priv) | |
1da177e4 | 365 | { |
c153f45f | 366 | struct drm_control *ctl = data; |
a319c1a4 | 367 | int ret = 0, irq; |
b5e89ed5 | 368 | |
27641c3f MK |
369 | /* if we haven't irq we fallback for compatibility reasons - |
370 | * this used to be a separate function in drm_dma.h | |
371 | */ | |
1da177e4 | 372 | |
22471cf6 DV |
373 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
374 | return 0; | |
375 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
376 | return 0; | |
377 | /* UMS was only ever support on pci devices. */ | |
378 | if (WARN_ON(!dev->pdev)) | |
379 | return -EINVAL; | |
1da177e4 | 380 | |
c153f45f | 381 | switch (ctl->func) { |
1da177e4 | 382 | case DRM_INST_HANDLER: |
a319c1a4 DV |
383 | irq = dev->pdev->irq; |
384 | ||
1da177e4 | 385 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 386 | ctl->irq != irq) |
1da177e4 | 387 | return -EINVAL; |
e090c53b | 388 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 389 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
390 | mutex_unlock(&dev->struct_mutex); |
391 | ||
392 | return ret; | |
1da177e4 | 393 | case DRM_UNINST_HANDLER: |
e090c53b DV |
394 | mutex_lock(&dev->struct_mutex); |
395 | ret = drm_irq_uninstall(dev); | |
396 | mutex_unlock(&dev->struct_mutex); | |
397 | ||
398 | return ret; | |
1da177e4 LT |
399 | default: |
400 | return -EINVAL; | |
401 | } | |
402 | } | |
403 | ||
27641c3f | 404 | /** |
21b21560 | 405 | * drm_calc_timestamping_constants - Calculate vblank timestamp constants |
27641c3f MK |
406 | * |
407 | * @crtc drm_crtc whose timestamp constants should be updated. | |
545cdd55 | 408 | * @mode display mode containing the scanout timings |
27641c3f | 409 | * |
21b21560 VS |
410 | * Calculate and store various constants which are later |
411 | * needed by vblank and swap-completion timestamping, e.g, | |
412 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are | |
413 | * derived from crtc's true scanout timing, so they take | |
414 | * things like panel scaling or other adjustments into account. | |
27641c3f | 415 | */ |
545cdd55 VS |
416 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
417 | const struct drm_display_mode *mode) | |
27641c3f | 418 | { |
3c184f69 | 419 | int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; |
77666b72 | 420 | int dotclock = mode->crtc_clock; |
27641c3f MK |
421 | |
422 | /* Valid dotclock? */ | |
423 | if (dotclock > 0) { | |
0dae35a3 VS |
424 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
425 | ||
426 | /* | |
427 | * Convert scanline length in pixels and video | |
428 | * dot clock to line duration, frame duration | |
429 | * and pixel duration in nanoseconds: | |
27641c3f | 430 | */ |
0dae35a3 VS |
431 | pixeldur_ns = 1000000 / dotclock; |
432 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); | |
433 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); | |
c0ae24c1 VS |
434 | |
435 | /* | |
436 | * Fields of interlaced scanout modes are only half a frame duration. | |
437 | */ | |
438 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) | |
439 | framedur_ns /= 2; | |
27641c3f MK |
440 | } else |
441 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", | |
442 | crtc->base.id); | |
443 | ||
444 | crtc->pixeldur_ns = pixeldur_ns; | |
445 | crtc->linedur_ns = linedur_ns; | |
446 | crtc->framedur_ns = framedur_ns; | |
447 | ||
448 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", | |
545cdd55 VS |
449 | crtc->base.id, mode->crtc_htotal, |
450 | mode->crtc_vtotal, mode->crtc_vdisplay); | |
27641c3f | 451 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", |
3c184f69 VS |
452 | crtc->base.id, dotclock, framedur_ns, |
453 | linedur_ns, pixeldur_ns); | |
27641c3f MK |
454 | } |
455 | EXPORT_SYMBOL(drm_calc_timestamping_constants); | |
456 | ||
457 | /** | |
458 | * drm_calc_vbltimestamp_from_scanoutpos - helper routine for kms | |
459 | * drivers. Implements calculation of exact vblank timestamps from | |
460 | * given drm_display_mode timings and current video scanout position | |
461 | * of a crtc. This can be called from within get_vblank_timestamp() | |
462 | * implementation of a kms driver to implement the actual timestamping. | |
463 | * | |
464 | * Should return timestamps conforming to the OML_sync_control OpenML | |
465 | * extension specification. The timestamp corresponds to the end of | |
466 | * the vblank interval, aka start of scanout of topmost-leftmost display | |
467 | * pixel in the following video frame. | |
468 | * | |
469 | * Requires support for optional dev->driver->get_scanout_position() | |
470 | * in kms driver, plus a bit of setup code to provide a drm_display_mode | |
471 | * that corresponds to the true scanout timing. | |
472 | * | |
473 | * The current implementation only handles standard video modes. It | |
474 | * returns as no operation if a doublescan or interlaced video mode is | |
475 | * active. Higher level code is expected to handle this. | |
476 | * | |
477 | * @dev: DRM device. | |
478 | * @crtc: Which crtc's vblank timestamp to retrieve. | |
479 | * @max_error: Desired maximum allowable error in timestamps (nanosecs). | |
480 | * On return contains true maximum error of timestamp. | |
481 | * @vblank_time: Pointer to struct timeval which should receive the timestamp. | |
482 | * @flags: Flags to pass to driver: | |
483 | * 0 = Default. | |
484 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. | |
485 | * @refcrtc: drm_crtc* of crtc which defines scanout timing. | |
7da903ef | 486 | * @mode: mode which defines the scanout timings |
27641c3f MK |
487 | * |
488 | * Returns negative value on error, failure or if not supported in current | |
489 | * video mode: | |
490 | * | |
491 | * -EINVAL - Invalid crtc. | |
492 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. | |
493 | * -ENOTSUPP - Function not supported in current display mode. | |
494 | * -EIO - Failed, e.g., due to failed scanout position query. | |
495 | * | |
496 | * Returns or'ed positive status flags on success: | |
497 | * | |
498 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. | |
499 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. | |
500 | * | |
501 | */ | |
502 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, | |
503 | int *max_error, | |
504 | struct timeval *vblank_time, | |
505 | unsigned flags, | |
7da903ef VS |
506 | const struct drm_crtc *refcrtc, |
507 | const struct drm_display_mode *mode) | |
27641c3f | 508 | { |
e62f2f5a ID |
509 | ktime_t stime, etime, mono_time_offset; |
510 | struct timeval tv_etime; | |
8072bfa6 | 511 | int vbl_status; |
27641c3f | 512 | int vpos, hpos, i; |
3c184f69 | 513 | int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; |
27641c3f MK |
514 | bool invbl; |
515 | ||
516 | if (crtc < 0 || crtc >= dev->num_crtcs) { | |
517 | DRM_ERROR("Invalid crtc %d\n", crtc); | |
518 | return -EINVAL; | |
519 | } | |
520 | ||
521 | /* Scanout position query not supported? Should not happen. */ | |
522 | if (!dev->driver->get_scanout_position) { | |
523 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); | |
524 | return -EIO; | |
525 | } | |
526 | ||
27641c3f MK |
527 | /* Durations of frames, lines, pixels in nanoseconds. */ |
528 | framedur_ns = refcrtc->framedur_ns; | |
529 | linedur_ns = refcrtc->linedur_ns; | |
530 | pixeldur_ns = refcrtc->pixeldur_ns; | |
531 | ||
532 | /* If mode timing undefined, just return as no-op: | |
533 | * Happens during initial modesetting of a crtc. | |
534 | */ | |
8072bfa6 | 535 | if (framedur_ns == 0) { |
27641c3f MK |
536 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); |
537 | return -EAGAIN; | |
538 | } | |
539 | ||
27641c3f MK |
540 | /* Get current scanout position with system timestamp. |
541 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times | |
542 | * if single query takes longer than max_error nanoseconds. | |
543 | * | |
544 | * This guarantees a tight bound on maximum error if | |
545 | * code gets preempted or delayed for some reason. | |
546 | */ | |
547 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { | |
8f6fce03 MK |
548 | /* |
549 | * Get vertical and horizontal scanout position vpos, hpos, | |
550 | * and bounding timestamps stime, etime, pre/post query. | |
551 | */ | |
abca9e45 | 552 | vbl_status = dev->driver->get_scanout_position(dev, crtc, flags, &vpos, |
8f6fce03 | 553 | &hpos, &stime, &etime); |
27641c3f | 554 | |
8f6fce03 MK |
555 | /* |
556 | * Get correction for CLOCK_MONOTONIC -> CLOCK_REALTIME if | |
557 | * CLOCK_REALTIME is requested. | |
558 | */ | |
c61eef72 ID |
559 | if (!drm_timestamp_monotonic) |
560 | mono_time_offset = ktime_get_monotonic_offset(); | |
27641c3f | 561 | |
27641c3f MK |
562 | /* Return as no-op if scanout query unsupported or failed. */ |
563 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { | |
564 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", | |
565 | crtc, vbl_status); | |
566 | return -EIO; | |
567 | } | |
568 | ||
8f6fce03 | 569 | /* Compute uncertainty in timestamp of scanout position query. */ |
e62f2f5a | 570 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
27641c3f MK |
571 | |
572 | /* Accept result with < max_error nsecs timing uncertainty. */ | |
3c184f69 | 573 | if (duration_ns <= *max_error) |
27641c3f MK |
574 | break; |
575 | } | |
576 | ||
577 | /* Noisy system timing? */ | |
578 | if (i == DRM_TIMESTAMP_MAXRETRIES) { | |
579 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", | |
3c184f69 | 580 | crtc, duration_ns/1000, *max_error/1000, i); |
27641c3f MK |
581 | } |
582 | ||
583 | /* Return upper bound of timestamp precision error. */ | |
3c184f69 | 584 | *max_error = duration_ns; |
27641c3f MK |
585 | |
586 | /* Check if in vblank area: | |
587 | * vpos is >=0 in video scanout area, but negative | |
588 | * within vblank area, counting down the number of lines until | |
589 | * start of scanout. | |
590 | */ | |
591 | invbl = vbl_status & DRM_SCANOUTPOS_INVBL; | |
592 | ||
593 | /* Convert scanout position into elapsed time at raw_time query | |
594 | * since start of scanout at first display scanline. delta_ns | |
595 | * can be negative if start of scanout hasn't happened yet. | |
596 | */ | |
3c184f69 | 597 | delta_ns = vpos * linedur_ns + hpos * pixeldur_ns; |
27641c3f | 598 | |
c61eef72 ID |
599 | if (!drm_timestamp_monotonic) |
600 | etime = ktime_sub(etime, mono_time_offset); | |
601 | ||
e62f2f5a ID |
602 | /* save this only for debugging purposes */ |
603 | tv_etime = ktime_to_timeval(etime); | |
27641c3f MK |
604 | /* Subtract time delta from raw timestamp to get final |
605 | * vblank_time timestamp for end of vblank. | |
606 | */ | |
e91abf80 MD |
607 | if (delta_ns < 0) |
608 | etime = ktime_add_ns(etime, -delta_ns); | |
609 | else | |
610 | etime = ktime_sub_ns(etime, delta_ns); | |
e62f2f5a | 611 | *vblank_time = ktime_to_timeval(etime); |
27641c3f | 612 | |
bbb0aef5 JP |
613 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
614 | crtc, (int)vbl_status, hpos, vpos, | |
e62f2f5a | 615 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
bbb0aef5 | 616 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
3c184f69 | 617 | duration_ns/1000, i); |
27641c3f MK |
618 | |
619 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; | |
620 | if (invbl) | |
621 | vbl_status |= DRM_VBLANKTIME_INVBL; | |
622 | ||
623 | return vbl_status; | |
624 | } | |
625 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); | |
626 | ||
c61eef72 ID |
627 | static struct timeval get_drm_timestamp(void) |
628 | { | |
629 | ktime_t now; | |
630 | ||
631 | now = ktime_get(); | |
632 | if (!drm_timestamp_monotonic) | |
633 | now = ktime_sub(now, ktime_get_monotonic_offset()); | |
634 | ||
635 | return ktime_to_timeval(now); | |
636 | } | |
637 | ||
27641c3f MK |
638 | /** |
639 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent | |
640 | * vblank interval. | |
641 | * | |
642 | * @dev: DRM device | |
643 | * @crtc: which crtc's vblank timestamp to retrieve | |
644 | * @tvblank: Pointer to target struct timeval which should receive the timestamp | |
645 | * @flags: Flags to pass to driver: | |
646 | * 0 = Default. | |
647 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. | |
648 | * | |
649 | * Fetches the system timestamp corresponding to the time of the most recent | |
650 | * vblank interval on specified crtc. May call into kms-driver to | |
651 | * compute the timestamp with a high-precision GPU specific method. | |
652 | * | |
653 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() | |
654 | * call, i.e., it isn't very precisely locked to the true vblank. | |
655 | * | |
656 | * Returns non-zero if timestamp is considered to be very precise. | |
657 | */ | |
658 | u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, | |
659 | struct timeval *tvblank, unsigned flags) | |
660 | { | |
4a1b0714 | 661 | int ret; |
27641c3f MK |
662 | |
663 | /* Define requested maximum error on timestamps (nanoseconds). */ | |
664 | int max_error = (int) drm_timestamp_precision * 1000; | |
665 | ||
666 | /* Query driver if possible and precision timestamping enabled. */ | |
667 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { | |
668 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, | |
669 | tvblank, flags); | |
670 | if (ret > 0) | |
671 | return (u32) ret; | |
672 | } | |
673 | ||
674 | /* GPU high precision timestamp query unsupported or failed. | |
c61eef72 | 675 | * Return current monotonic/gettimeofday timestamp as best estimate. |
27641c3f | 676 | */ |
c61eef72 | 677 | *tvblank = get_drm_timestamp(); |
27641c3f MK |
678 | |
679 | return 0; | |
680 | } | |
681 | EXPORT_SYMBOL(drm_get_last_vbltimestamp); | |
682 | ||
0a3e67a4 JB |
683 | /** |
684 | * drm_vblank_count - retrieve "cooked" vblank counter value | |
685 | * @dev: DRM device | |
686 | * @crtc: which counter to retrieve | |
687 | * | |
688 | * Fetches the "cooked" vblank count value that represents the number of | |
689 | * vblank events since the system was booted, including lost events due to | |
690 | * modesetting activity. | |
691 | */ | |
692 | u32 drm_vblank_count(struct drm_device *dev, int crtc) | |
693 | { | |
5380e929 | 694 | return atomic_read(&dev->vblank[crtc].count); |
0a3e67a4 JB |
695 | } |
696 | EXPORT_SYMBOL(drm_vblank_count); | |
697 | ||
27641c3f MK |
698 | /** |
699 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value | |
700 | * and the system timestamp corresponding to that vblank counter value. | |
701 | * | |
702 | * @dev: DRM device | |
703 | * @crtc: which counter to retrieve | |
704 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. | |
705 | * | |
706 | * Fetches the "cooked" vblank count value that represents the number of | |
707 | * vblank events since the system was booted, including lost events due to | |
708 | * modesetting activity. Returns corresponding system timestamp of the time | |
709 | * of the vblank interval that corresponds to the current value vblank counter | |
710 | * value. | |
711 | */ | |
712 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, | |
713 | struct timeval *vblanktime) | |
714 | { | |
715 | u32 cur_vblank; | |
716 | ||
717 | /* Read timestamp from slot of _vblank_time ringbuffer | |
718 | * that corresponds to current vblank count. Retry if | |
719 | * count has incremented during readout. This works like | |
720 | * a seqlock. | |
721 | */ | |
722 | do { | |
5380e929 | 723 | cur_vblank = atomic_read(&dev->vblank[crtc].count); |
27641c3f MK |
724 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); |
725 | smp_rmb(); | |
5380e929 | 726 | } while (cur_vblank != atomic_read(&dev->vblank[crtc].count)); |
27641c3f MK |
727 | |
728 | return cur_vblank; | |
729 | } | |
730 | EXPORT_SYMBOL(drm_vblank_count_and_time); | |
731 | ||
c6eefa17 RC |
732 | static void send_vblank_event(struct drm_device *dev, |
733 | struct drm_pending_vblank_event *e, | |
734 | unsigned long seq, struct timeval *now) | |
735 | { | |
736 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); | |
737 | e->event.sequence = seq; | |
738 | e->event.tv_sec = now->tv_sec; | |
739 | e->event.tv_usec = now->tv_usec; | |
740 | ||
741 | list_add_tail(&e->base.link, | |
742 | &e->base.file_priv->event_list); | |
743 | wake_up_interruptible(&e->base.file_priv->event_wait); | |
744 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, | |
745 | e->event.sequence); | |
746 | } | |
747 | ||
748 | /** | |
749 | * drm_send_vblank_event - helper to send vblank event after pageflip | |
750 | * @dev: DRM device | |
751 | * @crtc: CRTC in question | |
752 | * @e: the event to send | |
753 | * | |
754 | * Updates sequence # and timestamp on event, and sends it to userspace. | |
755 | * Caller must hold event lock. | |
756 | */ | |
757 | void drm_send_vblank_event(struct drm_device *dev, int crtc, | |
758 | struct drm_pending_vblank_event *e) | |
759 | { | |
760 | struct timeval now; | |
761 | unsigned int seq; | |
762 | if (crtc >= 0) { | |
763 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
764 | } else { | |
765 | seq = 0; | |
c61eef72 ID |
766 | |
767 | now = get_drm_timestamp(); | |
c6eefa17 | 768 | } |
21a245d2 | 769 | e->pipe = crtc; |
c6eefa17 RC |
770 | send_vblank_event(dev, e, seq, &now); |
771 | } | |
772 | EXPORT_SYMBOL(drm_send_vblank_event); | |
773 | ||
0a3e67a4 JB |
774 | /** |
775 | * drm_update_vblank_count - update the master vblank counter | |
776 | * @dev: DRM device | |
777 | * @crtc: counter to update | |
778 | * | |
779 | * Call back into the driver to update the appropriate vblank counter | |
780 | * (specified by @crtc). Deal with wraparound, if it occurred, and | |
781 | * update the last read value so we can deal with wraparound on the next | |
782 | * call if necessary. | |
783 | * | |
784 | * Only necessary when going from off->on, to account for frames we | |
785 | * didn't get an interrupt for. | |
786 | * | |
787 | * Note: caller must hold dev->vbl_lock since this reads & writes | |
788 | * device vblank fields. | |
789 | */ | |
790 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) | |
791 | { | |
27641c3f MK |
792 | u32 cur_vblank, diff, tslot, rc; |
793 | struct timeval t_vblank; | |
0a3e67a4 JB |
794 | |
795 | /* | |
796 | * Interrupts were disabled prior to this call, so deal with counter | |
797 | * wrap if needed. | |
798 | * NOTE! It's possible we lost a full dev->max_vblank_count events | |
799 | * here if the register is small or we had vblank interrupts off for | |
800 | * a long time. | |
27641c3f MK |
801 | * |
802 | * We repeat the hardware vblank counter & timestamp query until | |
803 | * we get consistent results. This to prevent races between gpu | |
804 | * updating its hardware counter while we are retrieving the | |
805 | * corresponding vblank timestamp. | |
0a3e67a4 | 806 | */ |
27641c3f MK |
807 | do { |
808 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); | |
809 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); | |
810 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); | |
811 | ||
812 | /* Deal with counter wrap */ | |
5380e929 VS |
813 | diff = cur_vblank - dev->vblank[crtc].last; |
814 | if (cur_vblank < dev->vblank[crtc].last) { | |
0a3e67a4 JB |
815 | diff += dev->max_vblank_count; |
816 | ||
817 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", | |
5380e929 | 818 | crtc, dev->vblank[crtc].last, cur_vblank, diff); |
0a3e67a4 JB |
819 | } |
820 | ||
821 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", | |
822 | crtc, diff); | |
823 | ||
27641c3f MK |
824 | /* Reinitialize corresponding vblank timestamp if high-precision query |
825 | * available. Skip this step if query unsupported or failed. Will | |
826 | * reinitialize delayed at next vblank interrupt in that case. | |
827 | */ | |
828 | if (rc) { | |
5380e929 | 829 | tslot = atomic_read(&dev->vblank[crtc].count) + diff; |
27641c3f | 830 | vblanktimestamp(dev, crtc, tslot) = t_vblank; |
27641c3f MK |
831 | } |
832 | ||
bc215128 | 833 | smp_mb__before_atomic_inc(); |
5380e929 | 834 | atomic_add(diff, &dev->vblank[crtc].count); |
bc215128 | 835 | smp_mb__after_atomic_inc(); |
0a3e67a4 JB |
836 | } |
837 | ||
838 | /** | |
839 | * drm_vblank_get - get a reference count on vblank events | |
840 | * @dev: DRM device | |
841 | * @crtc: which CRTC to own | |
842 | * | |
843 | * Acquire a reference count on vblank events to avoid having them disabled | |
844 | * while in use. | |
845 | * | |
846 | * RETURNS | |
847 | * Zero on success, nonzero on failure. | |
848 | */ | |
849 | int drm_vblank_get(struct drm_device *dev, int crtc) | |
850 | { | |
27641c3f | 851 | unsigned long irqflags, irqflags2; |
0a3e67a4 JB |
852 | int ret = 0; |
853 | ||
854 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
855 | /* Going from 0->1 means we have to enable interrupts again */ | |
5380e929 | 856 | if (atomic_add_return(1, &dev->vblank[crtc].refcount) == 1) { |
27641c3f | 857 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags2); |
5380e929 | 858 | if (!dev->vblank[crtc].enabled) { |
27641c3f MK |
859 | /* Enable vblank irqs under vblank_time_lock protection. |
860 | * All vblank count & timestamp updates are held off | |
861 | * until we are done reinitializing master counter and | |
862 | * timestamps. Filtercode in drm_handle_vblank() will | |
863 | * prevent double-accounting of same vblank interval. | |
864 | */ | |
778c9026 | 865 | ret = dev->driver->enable_vblank(dev, crtc); |
27641c3f MK |
866 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", |
867 | crtc, ret); | |
778c9026 | 868 | if (ret) |
5380e929 | 869 | atomic_dec(&dev->vblank[crtc].refcount); |
778c9026 | 870 | else { |
5380e929 | 871 | dev->vblank[crtc].enabled = true; |
778c9026 LP |
872 | drm_update_vblank_count(dev, crtc); |
873 | } | |
874 | } | |
27641c3f | 875 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2); |
778c9026 | 876 | } else { |
5380e929 VS |
877 | if (!dev->vblank[crtc].enabled) { |
878 | atomic_dec(&dev->vblank[crtc].refcount); | |
778c9026 | 879 | ret = -EINVAL; |
0a3e67a4 JB |
880 | } |
881 | } | |
882 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
883 | ||
884 | return ret; | |
885 | } | |
886 | EXPORT_SYMBOL(drm_vblank_get); | |
887 | ||
888 | /** | |
889 | * drm_vblank_put - give up ownership of vblank events | |
890 | * @dev: DRM device | |
891 | * @crtc: which counter to give up | |
892 | * | |
893 | * Release ownership of a given vblank counter, turning off interrupts | |
27641c3f | 894 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
0a3e67a4 JB |
895 | */ |
896 | void drm_vblank_put(struct drm_device *dev, int crtc) | |
897 | { | |
5380e929 | 898 | BUG_ON(atomic_read(&dev->vblank[crtc].refcount) == 0); |
b3f5e732 | 899 | |
0a3e67a4 | 900 | /* Last user schedules interrupt disable */ |
5380e929 | 901 | if (atomic_dec_and_test(&dev->vblank[crtc].refcount) && |
27641c3f MK |
902 | (drm_vblank_offdelay > 0)) |
903 | mod_timer(&dev->vblank_disable_timer, | |
bfd8303a | 904 | jiffies + ((drm_vblank_offdelay * HZ)/1000)); |
0a3e67a4 JB |
905 | } |
906 | EXPORT_SYMBOL(drm_vblank_put); | |
907 | ||
c6eefa17 RC |
908 | /** |
909 | * drm_vblank_off - disable vblank events on a CRTC | |
910 | * @dev: DRM device | |
911 | * @crtc: CRTC in question | |
912 | * | |
913 | * Caller must hold event lock. | |
914 | */ | |
778c9026 LP |
915 | void drm_vblank_off(struct drm_device *dev, int crtc) |
916 | { | |
498548ec CJHR |
917 | struct drm_pending_vblank_event *e, *t; |
918 | struct timeval now; | |
778c9026 | 919 | unsigned long irqflags; |
498548ec | 920 | unsigned int seq; |
778c9026 LP |
921 | |
922 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
27641c3f | 923 | vblank_disable_and_save(dev, crtc); |
57ed0f7b | 924 | wake_up(&dev->vblank[crtc].queue); |
498548ec CJHR |
925 | |
926 | /* Send any queued vblank events, lest the natives grow disquiet */ | |
927 | seq = drm_vblank_count_and_time(dev, crtc, &now); | |
e7783ba3 ID |
928 | |
929 | spin_lock(&dev->event_lock); | |
498548ec CJHR |
930 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
931 | if (e->pipe != crtc) | |
932 | continue; | |
933 | DRM_DEBUG("Sending premature vblank event on disable: \ | |
934 | wanted %d, current %d\n", | |
935 | e->event.sequence, seq); | |
c6eefa17 | 936 | list_del(&e->base.link); |
498548ec | 937 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 938 | send_vblank_event(dev, e, seq, &now); |
498548ec | 939 | } |
e7783ba3 | 940 | spin_unlock(&dev->event_lock); |
498548ec | 941 | |
778c9026 LP |
942 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
943 | } | |
944 | EXPORT_SYMBOL(drm_vblank_off); | |
945 | ||
f453ba04 DA |
946 | /** |
947 | * drm_vblank_pre_modeset - account for vblanks across mode sets | |
948 | * @dev: DRM device | |
949 | * @crtc: CRTC in question | |
f453ba04 DA |
950 | * |
951 | * Account for vblank events across mode setting events, which will likely | |
952 | * reset the hardware frame counter. | |
953 | */ | |
954 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) | |
955 | { | |
b7ea85a4 | 956 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
e77cef9c JG |
957 | if (!dev->num_crtcs) |
958 | return; | |
f453ba04 DA |
959 | /* |
960 | * To avoid all the problems that might happen if interrupts | |
961 | * were enabled/disabled around or between these calls, we just | |
962 | * have the kernel take a reference on the CRTC (just once though | |
963 | * to avoid corrupting the count if multiple, mismatch calls occur), | |
964 | * so that interrupts remain enabled in the interim. | |
965 | */ | |
5380e929 VS |
966 | if (!dev->vblank[crtc].inmodeset) { |
967 | dev->vblank[crtc].inmodeset = 0x1; | |
b3f5e732 | 968 | if (drm_vblank_get(dev, crtc) == 0) |
5380e929 | 969 | dev->vblank[crtc].inmodeset |= 0x2; |
f453ba04 DA |
970 | } |
971 | } | |
972 | EXPORT_SYMBOL(drm_vblank_pre_modeset); | |
973 | ||
974 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) | |
975 | { | |
976 | unsigned long irqflags; | |
977 | ||
b7ea85a4 HC |
978 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
979 | if (!dev->num_crtcs) | |
980 | return; | |
981 | ||
5380e929 | 982 | if (dev->vblank[crtc].inmodeset) { |
f453ba04 | 983 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
ba0bf120 | 984 | dev->vblank_disable_allowed = true; |
f453ba04 | 985 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
b3f5e732 | 986 | |
5380e929 | 987 | if (dev->vblank[crtc].inmodeset & 0x2) |
b3f5e732 CW |
988 | drm_vblank_put(dev, crtc); |
989 | ||
5380e929 | 990 | dev->vblank[crtc].inmodeset = 0; |
f453ba04 DA |
991 | } |
992 | } | |
993 | EXPORT_SYMBOL(drm_vblank_post_modeset); | |
994 | ||
0a3e67a4 JB |
995 | /** |
996 | * drm_modeset_ctl - handle vblank event counter changes across mode switch | |
997 | * @DRM_IOCTL_ARGS: standard ioctl arguments | |
998 | * | |
999 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET | |
1000 | * ioctls around modesetting so that any lost vblank events are accounted for. | |
1001 | * | |
1002 | * Generally the counter will reset across mode sets. If interrupts are | |
1003 | * enabled around this call, we don't have to do anything since the counter | |
1004 | * will have already been incremented. | |
1005 | */ | |
1006 | int drm_modeset_ctl(struct drm_device *dev, void *data, | |
1007 | struct drm_file *file_priv) | |
1008 | { | |
1009 | struct drm_modeset_ctl *modeset = data; | |
19227561 | 1010 | unsigned int crtc; |
0a3e67a4 JB |
1011 | |
1012 | /* If drm_vblank_init() hasn't been called yet, just no-op */ | |
1013 | if (!dev->num_crtcs) | |
4a1b0714 | 1014 | return 0; |
0a3e67a4 | 1015 | |
29935554 LP |
1016 | /* KMS drivers handle this internally */ |
1017 | if (drm_core_check_feature(dev, DRIVER_MODESET)) | |
1018 | return 0; | |
1019 | ||
0a3e67a4 | 1020 | crtc = modeset->crtc; |
4a1b0714 LP |
1021 | if (crtc >= dev->num_crtcs) |
1022 | return -EINVAL; | |
0a3e67a4 | 1023 | |
0a3e67a4 JB |
1024 | switch (modeset->cmd) { |
1025 | case _DRM_PRE_MODESET: | |
f453ba04 | 1026 | drm_vblank_pre_modeset(dev, crtc); |
0a3e67a4 JB |
1027 | break; |
1028 | case _DRM_POST_MODESET: | |
f453ba04 | 1029 | drm_vblank_post_modeset(dev, crtc); |
0a3e67a4 JB |
1030 | break; |
1031 | default: | |
4a1b0714 | 1032 | return -EINVAL; |
0a3e67a4 JB |
1033 | } |
1034 | ||
4a1b0714 | 1035 | return 0; |
0a3e67a4 JB |
1036 | } |
1037 | ||
c9a9c5e0 KH |
1038 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
1039 | union drm_wait_vblank *vblwait, | |
1040 | struct drm_file *file_priv) | |
1041 | { | |
1042 | struct drm_pending_vblank_event *e; | |
1043 | struct timeval now; | |
1044 | unsigned long flags; | |
1045 | unsigned int seq; | |
ea5d552c | 1046 | int ret; |
c9a9c5e0 KH |
1047 | |
1048 | e = kzalloc(sizeof *e, GFP_KERNEL); | |
ea5d552c CW |
1049 | if (e == NULL) { |
1050 | ret = -ENOMEM; | |
1051 | goto err_put; | |
1052 | } | |
c9a9c5e0 KH |
1053 | |
1054 | e->pipe = pipe; | |
b9c2c9ae | 1055 | e->base.pid = current->pid; |
c9a9c5e0 KH |
1056 | e->event.base.type = DRM_EVENT_VBLANK; |
1057 | e->event.base.length = sizeof e->event; | |
1058 | e->event.user_data = vblwait->request.signal; | |
1059 | e->base.event = &e->event.base; | |
1060 | e->base.file_priv = file_priv; | |
1061 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; | |
1062 | ||
c9a9c5e0 KH |
1063 | spin_lock_irqsave(&dev->event_lock, flags); |
1064 | ||
1065 | if (file_priv->event_space < sizeof e->event) { | |
ea5d552c CW |
1066 | ret = -EBUSY; |
1067 | goto err_unlock; | |
c9a9c5e0 KH |
1068 | } |
1069 | ||
1070 | file_priv->event_space -= sizeof e->event; | |
27641c3f MK |
1071 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
1072 | ||
c9a9c5e0 KH |
1073 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
1074 | (seq - vblwait->request.sequence) <= (1 << 23)) { | |
1075 | vblwait->request.sequence = seq + 1; | |
4a921645 | 1076 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1077 | } |
1078 | ||
1079 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", | |
1080 | vblwait->request.sequence, seq, pipe); | |
1081 | ||
b9c2c9ae JB |
1082 | trace_drm_vblank_event_queued(current->pid, pipe, |
1083 | vblwait->request.sequence); | |
1084 | ||
c9a9c5e0 KH |
1085 | e->event.sequence = vblwait->request.sequence; |
1086 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { | |
6f331623 | 1087 | drm_vblank_put(dev, pipe); |
c6eefa17 | 1088 | send_vblank_event(dev, e, seq, &now); |
000fa7cf | 1089 | vblwait->reply.sequence = seq; |
c9a9c5e0 | 1090 | } else { |
a6778e9e | 1091 | /* drm_handle_vblank_events will call drm_vblank_put */ |
c9a9c5e0 | 1092 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
000fa7cf | 1093 | vblwait->reply.sequence = vblwait->request.sequence; |
c9a9c5e0 KH |
1094 | } |
1095 | ||
1096 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1097 | ||
1098 | return 0; | |
ea5d552c CW |
1099 | |
1100 | err_unlock: | |
1101 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
1102 | kfree(e); | |
1103 | err_put: | |
6f331623 | 1104 | drm_vblank_put(dev, pipe); |
ea5d552c | 1105 | return ret; |
c9a9c5e0 KH |
1106 | } |
1107 | ||
1da177e4 LT |
1108 | /** |
1109 | * Wait for VBLANK. | |
1110 | * | |
1111 | * \param inode device inode. | |
6c340eac | 1112 | * \param file_priv DRM file private. |
1da177e4 LT |
1113 | * \param cmd command. |
1114 | * \param data user argument, pointing to a drm_wait_vblank structure. | |
1115 | * \return zero on success or a negative number on failure. | |
1116 | * | |
30b23634 EA |
1117 | * This function enables the vblank interrupt on the pipe requested, then |
1118 | * sleeps waiting for the requested sequence number to occur, and drops | |
1119 | * the vblank interrupt refcount afterwards. (vblank irq disable follows that | |
1120 | * after a timeout with no further vblank waits scheduled). | |
1da177e4 | 1121 | */ |
0a3e67a4 JB |
1122 | int drm_wait_vblank(struct drm_device *dev, void *data, |
1123 | struct drm_file *file_priv) | |
1da177e4 | 1124 | { |
c153f45f | 1125 | union drm_wait_vblank *vblwait = data; |
4a1b0714 | 1126 | int ret; |
19b01b5f | 1127 | unsigned int flags, seq, crtc, high_crtc; |
1da177e4 | 1128 | |
4984979b DV |
1129 | if (!dev->irq_enabled) |
1130 | return -EINVAL; | |
1da177e4 | 1131 | |
30b23634 EA |
1132 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
1133 | return -EINVAL; | |
1134 | ||
c153f45f | 1135 | if (vblwait->request.type & |
19b01b5f IH |
1136 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1137 | _DRM_VBLANK_HIGH_CRTC_MASK)) { | |
776c9443 | 1138 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
c153f45f | 1139 | vblwait->request.type, |
19b01b5f IH |
1140 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
1141 | _DRM_VBLANK_HIGH_CRTC_MASK)); | |
776c9443 MCA |
1142 | return -EINVAL; |
1143 | } | |
1144 | ||
c153f45f | 1145 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
19b01b5f IH |
1146 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
1147 | if (high_crtc) | |
1148 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; | |
1149 | else | |
1150 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; | |
0a3e67a4 | 1151 | if (crtc >= dev->num_crtcs) |
776c9443 MCA |
1152 | return -EINVAL; |
1153 | ||
0a3e67a4 JB |
1154 | ret = drm_vblank_get(dev, crtc); |
1155 | if (ret) { | |
8d3457ec | 1156 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
0a3e67a4 JB |
1157 | return ret; |
1158 | } | |
1159 | seq = drm_vblank_count(dev, crtc); | |
776c9443 | 1160 | |
c153f45f | 1161 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
1da177e4 | 1162 | case _DRM_VBLANK_RELATIVE: |
c153f45f EA |
1163 | vblwait->request.sequence += seq; |
1164 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; | |
1da177e4 LT |
1165 | case _DRM_VBLANK_ABSOLUTE: |
1166 | break; | |
1167 | default: | |
0a3e67a4 JB |
1168 | ret = -EINVAL; |
1169 | goto done; | |
1da177e4 LT |
1170 | } |
1171 | ||
a6778e9e IH |
1172 | if (flags & _DRM_VBLANK_EVENT) { |
1173 | /* must hold on to the vblank ref until the event fires | |
1174 | * drm_vblank_put will be called asynchronously | |
1175 | */ | |
c9a9c5e0 | 1176 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); |
a6778e9e | 1177 | } |
c9a9c5e0 | 1178 | |
ab285d74 | 1179 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
c153f45f EA |
1180 | (seq - vblwait->request.sequence) <= (1<<23)) { |
1181 | vblwait->request.sequence = seq + 1; | |
ab285d74 MCA |
1182 | } |
1183 | ||
30b23634 EA |
1184 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
1185 | vblwait->request.sequence, crtc); | |
5380e929 | 1186 | dev->vblank[crtc].last_wait = vblwait->request.sequence; |
bfd8303a | 1187 | DRM_WAIT_ON(ret, dev->vblank[crtc].queue, 3 * HZ, |
30b23634 EA |
1188 | (((drm_vblank_count(dev, crtc) - |
1189 | vblwait->request.sequence) <= (1 << 23)) || | |
1190 | !dev->irq_enabled)); | |
1da177e4 | 1191 | |
30b23634 EA |
1192 | if (ret != -EINTR) { |
1193 | struct timeval now; | |
1da177e4 | 1194 | |
27641c3f | 1195 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
30b23634 EA |
1196 | vblwait->reply.tval_sec = now.tv_sec; |
1197 | vblwait->reply.tval_usec = now.tv_usec; | |
27641c3f | 1198 | |
30b23634 EA |
1199 | DRM_DEBUG("returning %d to client\n", |
1200 | vblwait->reply.sequence); | |
1da177e4 | 1201 | } else { |
30b23634 | 1202 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
1da177e4 LT |
1203 | } |
1204 | ||
0a3e67a4 JB |
1205 | done: |
1206 | drm_vblank_put(dev, crtc); | |
1da177e4 LT |
1207 | return ret; |
1208 | } | |
1209 | ||
ea7f7abc | 1210 | static void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
c9a9c5e0 KH |
1211 | { |
1212 | struct drm_pending_vblank_event *e, *t; | |
1213 | struct timeval now; | |
1214 | unsigned long flags; | |
1215 | unsigned int seq; | |
1216 | ||
27641c3f | 1217 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
c9a9c5e0 KH |
1218 | |
1219 | spin_lock_irqsave(&dev->event_lock, flags); | |
1220 | ||
1221 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { | |
1222 | if (e->pipe != crtc) | |
1223 | continue; | |
1224 | if ((seq - e->event.sequence) > (1<<23)) | |
1225 | continue; | |
1226 | ||
1227 | DRM_DEBUG("vblank event on %d, current %d\n", | |
1228 | e->event.sequence, seq); | |
1229 | ||
c6eefa17 | 1230 | list_del(&e->base.link); |
c9a9c5e0 | 1231 | drm_vblank_put(dev, e->pipe); |
c6eefa17 | 1232 | send_vblank_event(dev, e, seq, &now); |
c9a9c5e0 KH |
1233 | } |
1234 | ||
1235 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
ac2874b9 JB |
1236 | |
1237 | trace_drm_vblank_event(crtc, seq); | |
c9a9c5e0 KH |
1238 | } |
1239 | ||
0a3e67a4 JB |
1240 | /** |
1241 | * drm_handle_vblank - handle a vblank event | |
1242 | * @dev: DRM device | |
1243 | * @crtc: where this event occurred | |
1244 | * | |
1245 | * Drivers should call this routine in their vblank interrupt handlers to | |
1246 | * update the vblank counter and send any signals that may be pending. | |
1247 | */ | |
78c6e170 | 1248 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
0a3e67a4 | 1249 | { |
27641c3f MK |
1250 | u32 vblcount; |
1251 | s64 diff_ns; | |
1252 | struct timeval tvblank; | |
1253 | unsigned long irqflags; | |
1254 | ||
c9a9c5e0 | 1255 | if (!dev->num_crtcs) |
78c6e170 | 1256 | return false; |
c9a9c5e0 | 1257 | |
27641c3f MK |
1258 | /* Need timestamp lock to prevent concurrent execution with |
1259 | * vblank enable/disable, as this would cause inconsistent | |
1260 | * or corrupted timestamps and vblank counts. | |
1261 | */ | |
1262 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); | |
1263 | ||
1264 | /* Vblank irq handling disabled. Nothing to do. */ | |
5380e929 | 1265 | if (!dev->vblank[crtc].enabled) { |
27641c3f | 1266 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
78c6e170 | 1267 | return false; |
27641c3f MK |
1268 | } |
1269 | ||
1270 | /* Fetch corresponding timestamp for this vblank interval from | |
1271 | * driver and store it in proper slot of timestamp ringbuffer. | |
1272 | */ | |
1273 | ||
1274 | /* Get current timestamp and count. */ | |
5380e929 | 1275 | vblcount = atomic_read(&dev->vblank[crtc].count); |
27641c3f MK |
1276 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); |
1277 | ||
1278 | /* Compute time difference to timestamp of last vblank */ | |
1279 | diff_ns = timeval_to_ns(&tvblank) - | |
1280 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); | |
1281 | ||
1282 | /* Update vblank timestamp and count if at least | |
1283 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds | |
1284 | * difference between last stored timestamp and current | |
1285 | * timestamp. A smaller difference means basically | |
1286 | * identical timestamps. Happens if this vblank has | |
1287 | * been already processed and this is a redundant call, | |
1288 | * e.g., due to spurious vblank interrupts. We need to | |
1289 | * ignore those for accounting. | |
1290 | */ | |
c4cc3839 | 1291 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { |
27641c3f MK |
1292 | /* Store new timestamp in ringbuffer. */ |
1293 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; | |
27641c3f MK |
1294 | |
1295 | /* Increment cooked vblank count. This also atomically commits | |
1296 | * the timestamp computed above. | |
1297 | */ | |
bc215128 | 1298 | smp_mb__before_atomic_inc(); |
5380e929 | 1299 | atomic_inc(&dev->vblank[crtc].count); |
bc215128 | 1300 | smp_mb__after_atomic_inc(); |
27641c3f MK |
1301 | } else { |
1302 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", | |
1303 | crtc, (int) diff_ns); | |
1304 | } | |
1305 | ||
57ed0f7b | 1306 | wake_up(&dev->vblank[crtc].queue); |
c9a9c5e0 | 1307 | drm_handle_vblank_events(dev, crtc); |
27641c3f MK |
1308 | |
1309 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); | |
78c6e170 | 1310 | return true; |
0a3e67a4 JB |
1311 | } |
1312 | EXPORT_SYMBOL(drm_handle_vblank); |