blob: af9662e582727ba403cc829bc89ae9a4e3878b3b [file] [log] [blame]
Daniel Vetterf5752b32014-05-08 16:41:51 +02001/*
2 * drm_irq.c IRQ and vblank support
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
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
David Howells760285e2012-10-02 18:01:07 +010035#include <drm/drmP.h>
Jesse Barnesac2874b2010-07-01 16:47:31 -070036#include "drm_trace.h"
Daniel Vetter18882992014-09-10 08:16:10 +020037#include "drm_internal.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <linux/interrupt.h> /* For task queue support */
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Dave Airlie28d52042009-09-21 14:33:58 +100042#include <linux/vgaarb.h>
Paul Gortmaker2d1a8a42011-08-30 18:16:33 -040043#include <linux/export.h>
Mario Kleiner27641c3f2010-10-23 04:20:23 +020044
45/* Access macro for slots in vblank timestamp ringbuffer. */
Ville Syrjälä5380e922013-10-04 14:53:36 +030046#define vblanktimestamp(dev, crtc, count) \
47 ((dev)->vblank[crtc].time[(count) % DRM_VBLANKTIME_RBSIZE])
Mario Kleiner27641c3f2010-10-23 04:20:23 +020048
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
Daniel Vetterfb446a12014-09-10 17:36:10 +020059static bool
60drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
61 struct timeval *tvblank, unsigned flags);
62
Daniel Vetter18882992014-09-10 08:16:10 +020063static 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 */
69unsigned int drm_timestamp_monotonic = 1;
70
71static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */
72
73module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
74module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
75module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
76
Ville Syrjälä13b030af52014-08-06 14:49:47 +030077/**
78 * drm_update_vblank_count - update the master vblank counter
79 * @dev: DRM device
80 * @crtc: counter to update
81 *
82 * Call back into the driver to update the appropriate vblank counter
83 * (specified by @crtc). Deal with wraparound, if it occurred, and
84 * update the last read value so we can deal with wraparound on the next
85 * call if necessary.
86 *
87 * Only necessary when going from off->on, to account for frames we
88 * didn't get an interrupt for.
89 *
90 * Note: caller must hold dev->vbl_lock since this reads & writes
91 * device vblank fields.
92 */
93static void drm_update_vblank_count(struct drm_device *dev, int crtc)
94{
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +030095 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
Daniel Vetterfb446a12014-09-10 17:36:10 +020096 u32 cur_vblank, diff, tslot;
97 bool rc;
Ville Syrjälä13b030af52014-08-06 14:49:47 +030098 struct timeval t_vblank;
99
100 /*
101 * Interrupts were disabled prior to this call, so deal with counter
102 * wrap if needed.
103 * NOTE! It's possible we lost a full dev->max_vblank_count events
104 * here if the register is small or we had vblank interrupts off for
105 * a long time.
106 *
107 * We repeat the hardware vblank counter & timestamp query until
108 * we get consistent results. This to prevent races between gpu
109 * updating its hardware counter while we are retrieving the
110 * corresponding vblank timestamp.
111 */
112 do {
113 cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
114 rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0);
115 } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc));
116
117 /* Deal with counter wrap */
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300118 diff = cur_vblank - vblank->last;
119 if (cur_vblank < vblank->last) {
Ville Syrjälä13b030af52014-08-06 14:49:47 +0300120 diff += dev->max_vblank_count;
121
122 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300123 crtc, vblank->last, cur_vblank, diff);
Ville Syrjälä13b030af52014-08-06 14:49:47 +0300124 }
125
Ville Syrjälä96a9fdd2014-08-06 14:50:02 +0300126 DRM_DEBUG("updating vblank count on crtc %d, missed %d\n",
Ville Syrjälä13b030af52014-08-06 14:49:47 +0300127 crtc, diff);
128
Mario Kleinerda8f4392014-09-13 18:25:54 +0200129 if (diff == 0)
130 return;
131
Ville Syrjälä13b030af52014-08-06 14:49:47 +0300132 /* Reinitialize corresponding vblank timestamp if high-precision query
133 * available. Skip this step if query unsupported or failed. Will
Mario Kleinerfdb68e02015-04-07 06:31:09 +0200134 * reinitialize delayed at next vblank interrupt in that case and
135 * assign 0 for now, to mark the vblanktimestamp as invalid.
Ville Syrjälä13b030af52014-08-06 14:49:47 +0300136 */
Mario Kleinerfdb68e02015-04-07 06:31:09 +0200137 tslot = atomic_read(&vblank->count) + diff;
138 vblanktimestamp(dev, crtc, tslot) = rc ? t_vblank : (struct timeval) {0, 0};
Ville Syrjälä13b030af52014-08-06 14:49:47 +0300139
140 smp_mb__before_atomic();
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300141 atomic_add(diff, &vblank->count);
Ville Syrjälä13b030af52014-08-06 14:49:47 +0300142 smp_mb__after_atomic();
143}
144
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200145/*
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200146 * Disable vblank irq's on crtc, make sure that last vblank count
147 * of hardware and corresponding consistent software vblank counter
148 * are preserved, even if there are any spurious vblank irq's after
149 * disable.
150 */
151static void vblank_disable_and_save(struct drm_device *dev, int crtc)
152{
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300153 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200154 unsigned long irqflags;
155 u32 vblcount;
156 s64 diff_ns;
Daniel Vetterfb446a12014-09-10 17:36:10 +0200157 bool vblrc;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200158 struct timeval tvblank;
Egbert Eich0355cf32012-10-13 11:36:14 +0000159 int count = DRM_TIMESTAMP_MAXRETRIES;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200160
161 /* Prevent vblank irq processing while disabling vblank irqs,
162 * so no updates of timestamps or count can happen after we've
163 * disabled. Needed to prevent races in case of delayed irq's.
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200164 */
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200165 spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
166
Ville Syrjälä812e7462014-08-06 14:49:48 +0300167 /*
Martin Peres393e8722014-12-09 08:13:09 +0100168 * If the vblank interrupt was already disabled update the count
Ville Syrjälä812e7462014-08-06 14:49:48 +0300169 * and timestamp to maintain the appearance that the counter
170 * has been ticking all along until this time. This makes the
171 * count account for the entire time between drm_vblank_on() and
172 * drm_vblank_off().
Daniel Vetter855d30b2014-09-10 17:36:09 +0200173 *
174 * But only do this if precise vblank timestamps are available.
175 * Otherwise we might read a totally bogus timestamp since drivers
176 * lacking precise timestamp support rely upon sampling the system clock
177 * at vblank interrupt time. Which obviously won't work out well if the
178 * vblank interrupt is disabled.
Ville Syrjälä812e7462014-08-06 14:49:48 +0300179 */
Daniel Vetter855d30b2014-09-10 17:36:09 +0200180 if (!vblank->enabled &&
Daniel Vetterfb446a12014-09-10 17:36:10 +0200181 drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0)) {
Ville Syrjälä812e7462014-08-06 14:49:48 +0300182 drm_update_vblank_count(dev, crtc);
183 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
184 return;
185 }
186
Laurent Pincharteb2ed662015-01-29 01:09:24 +0200187 /*
188 * Only disable vblank interrupts if they're enabled. This avoids
189 * calling the ->disable_vblank() operation in atomic context with the
190 * hardware potentially runtime suspended.
191 */
192 if (vblank->enabled) {
193 dev->driver->disable_vblank(dev, crtc);
194 vblank->enabled = false;
195 }
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200196
197 /* No further vblank irq's will be processed after
198 * this point. Get current hardware vblank count and
199 * vblank timestamp, repeat until they are consistent.
200 *
201 * FIXME: There is still a race condition here and in
202 * drm_update_vblank_count() which can cause off-by-one
203 * reinitialization of software vblank counter. If gpu
204 * vblank counter doesn't increment exactly at the leading
205 * edge of a vblank interval, then we can lose 1 count if
206 * we happen to execute between start of vblank and the
207 * delayed gpu counter increment.
208 */
209 do {
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300210 vblank->last = dev->driver->get_vblank_counter(dev, crtc);
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200211 vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0);
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300212 } while (vblank->last != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc);
Egbert Eich0355cf32012-10-13 11:36:14 +0000213
214 if (!count)
215 vblrc = 0;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200216
217 /* Compute time difference to stored timestamp of last vblank
218 * as updated by last invocation of drm_handle_vblank() in vblank irq.
219 */
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300220 vblcount = atomic_read(&vblank->count);
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200221 diff_ns = timeval_to_ns(&tvblank) -
222 timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
223
224 /* If there is at least 1 msec difference between the last stored
225 * timestamp and tvblank, then we are currently executing our
226 * disable inside a new vblank interval, the tvblank timestamp
227 * corresponds to this new vblank interval and the irq handler
228 * for this vblank didn't run yet and won't run due to our disable.
229 * Therefore we need to do the job of drm_handle_vblank() and
230 * increment the vblank counter by one to account for this vblank.
231 *
232 * Skip this step if there isn't any high precision timestamp
233 * available. In that case we can't account for this and just
234 * hope for the best.
235 */
Daniel Vetterfb446a12014-09-10 17:36:10 +0200236 if (vblrc && (abs64(diff_ns) > 1000000)) {
Ville Syrjäläc50d7522014-08-06 14:49:59 +0300237 /* Store new timestamp in ringbuffer. */
238 vblanktimestamp(dev, crtc, vblcount + 1) = tvblank;
239
240 /* Increment cooked vblank count. This also atomically commits
241 * the timestamp computed above.
242 */
243 smp_mb__before_atomic();
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300244 atomic_inc(&vblank->count);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100245 smp_mb__after_atomic();
Mario Kleinerbc215122011-02-21 05:42:01 +0100246 }
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200247
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200248 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200249}
250
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700251static void vblank_disable_fn(unsigned long arg)
252{
Ville Syrjäläe69595c2014-02-19 19:36:08 +0200253 struct drm_vblank_crtc *vblank = (void *)arg;
254 struct drm_device *dev = vblank->dev;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700255 unsigned long irqflags;
Ville Syrjäläe69595c2014-02-19 19:36:08 +0200256 int crtc = vblank->crtc;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700257
258 if (!dev->vblank_disable_allowed)
259 return;
260
Ville Syrjäläe69595c2014-02-19 19:36:08 +0200261 spin_lock_irqsave(&dev->vbl_lock, irqflags);
262 if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) {
263 DRM_DEBUG("disabling vblank on crtc %d\n", crtc);
264 vblank_disable_and_save(dev, crtc);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700265 }
Ville Syrjäläe69595c2014-02-19 19:36:08 +0200266 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700267}
268
Daniel Vetterf5752b32014-05-08 16:41:51 +0200269/**
270 * drm_vblank_cleanup - cleanup vblank support
271 * @dev: DRM device
272 *
273 * This function cleans up any resources allocated in drm_vblank_init.
274 */
Keith Packard52440212008-11-18 09:30:25 -0800275void drm_vblank_cleanup(struct drm_device *dev)
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700276{
Ville Syrjäläe69595c2014-02-19 19:36:08 +0200277 int crtc;
278
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700279 /* Bail if the driver didn't call drm_vblank_init() */
280 if (dev->num_crtcs == 0)
281 return;
282
Ville Syrjäläe69595c2014-02-19 19:36:08 +0200283 for (crtc = 0; crtc < dev->num_crtcs; crtc++) {
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300284 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
285
Daniel Vetter3bff93d2015-02-22 15:11:19 +0100286 WARN_ON(vblank->enabled &&
287 drm_core_check_feature(dev, DRIVER_MODESET));
Mario Kleiner2368ffb2014-08-06 03:22:46 +0200288
Daniel Vetter3bff93d2015-02-22 15:11:19 +0100289 del_timer_sync(&vblank->disable_timer);
Ville Syrjäläe69595c2014-02-19 19:36:08 +0200290 }
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700291
Ville Syrjälä5380e922013-10-04 14:53:36 +0300292 kfree(dev->vblank);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700293
294 dev->num_crtcs = 0;
295}
Jerome Glissee77cef92010-01-07 15:39:13 +0100296EXPORT_SYMBOL(drm_vblank_cleanup);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700297
Daniel Vetterf5752b32014-05-08 16:41:51 +0200298/**
299 * drm_vblank_init - initialize vblank support
300 * @dev: drm_device
301 * @num_crtcs: number of crtcs supported by @dev
302 *
303 * This function initializes vblank support for @num_crtcs display pipelines.
304 *
305 * Returns:
306 * Zero on success or a negative error code on failure.
307 */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700308int drm_vblank_init(struct drm_device *dev, int num_crtcs)
309{
310 int i, ret = -ENOMEM;
311
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700312 spin_lock_init(&dev->vbl_lock);
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200313 spin_lock_init(&dev->vblank_time_lock);
314
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700315 dev->num_crtcs = num_crtcs;
316
Ville Syrjälä5380e922013-10-04 14:53:36 +0300317 dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL);
318 if (!dev->vblank)
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700319 goto err;
320
Ville Syrjäläe69595c2014-02-19 19:36:08 +0200321 for (i = 0; i < num_crtcs; i++) {
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300322 struct drm_vblank_crtc *vblank = &dev->vblank[i];
323
324 vblank->dev = dev;
325 vblank->crtc = i;
326 init_waitqueue_head(&vblank->queue);
327 setup_timer(&vblank->disable_timer, vblank_disable_fn,
328 (unsigned long)vblank);
Ville Syrjäläe69595c2014-02-19 19:36:08 +0200329 }
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200330
Mario Kleiner8f6fce02013-10-30 05:13:06 +0100331 DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n");
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200332
333 /* Driver specific high-precision vblank timestamping supported? */
334 if (dev->driver->get_vblank_timestamp)
335 DRM_INFO("Driver supports precise vblank timestamp query.\n");
336 else
337 DRM_INFO("No driver support for vblank timestamp query.\n");
338
Ville Syrjäläba0bf122013-10-04 14:53:33 +0300339 dev->vblank_disable_allowed = false;
340
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700341 return 0;
342
343err:
Mario Kleiner79a093ae2014-08-06 03:22:44 +0200344 dev->num_crtcs = 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700345 return ret;
346}
347EXPORT_SYMBOL(drm_vblank_init);
348
Dave Airlie28d52042009-09-21 14:33:58 +1000349static void drm_irq_vgaarb_nokms(void *cookie, bool state)
350{
351 struct drm_device *dev = cookie;
352
353 if (dev->driver->vgaarb_irq) {
354 dev->driver->vgaarb_irq(dev, state);
355 return;
356 }
357
358 if (!dev->irq_enabled)
359 return;
360
Joonyoung Shim5037f8a2011-08-04 05:41:01 +0000361 if (state) {
362 if (dev->driver->irq_uninstall)
363 dev->driver->irq_uninstall(dev);
364 } else {
365 if (dev->driver->irq_preinstall)
366 dev->driver->irq_preinstall(dev);
367 if (dev->driver->irq_postinstall)
368 dev->driver->irq_postinstall(dev);
Dave Airlie28d52042009-09-21 14:33:58 +1000369 }
370}
371
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372/**
Daniel Vetterf5752b32014-05-08 16:41:51 +0200373 * drm_irq_install - install IRQ handler
374 * @dev: DRM device
375 * @irq: IRQ number to install the handler for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 *
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700377 * Initializes the IRQ related data. Installs the handler, calling the driver
Daniel Vetterf5752b32014-05-08 16:41:51 +0200378 * irq_preinstall() and irq_postinstall() functions before and after the
379 * installation.
380 *
381 * This is the simplified helper interface provided for drivers with no special
382 * needs. Drivers which need to install interrupt handlers for multiple
383 * interrupts must instead set drm_device->irq_enabled to signal the DRM core
384 * that vblank interrupts are available.
385 *
386 * Returns:
387 * Zero on success or a negative error code on failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 */
Daniel Vetterbb0f1b52013-11-03 21:09:27 +0100389int drm_irq_install(struct drm_device *dev, int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390{
Laurent Pinchart4a1b0712012-05-17 13:27:21 +0200391 int ret;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000392 unsigned long sh_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
394 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
395 return -EINVAL;
396
Daniel Vetter7c1a38e32013-12-16 11:21:15 +0100397 if (irq == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 return -EINVAL;
399
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 /* Driver must have been initialized */
Daniel Vettere090c532013-11-03 20:27:05 +0100401 if (!dev->dev_private)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Daniel Vettere090c532013-11-03 20:27:05 +0100404 if (dev->irq_enabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 return -EBUSY;
Ville Syrjälä44238432013-10-04 14:53:37 +0300406 dev->irq_enabled = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Daniel Vetter7c1a38e32013-12-16 11:21:15 +0100408 DRM_DEBUG("irq=%d\n", irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000410 /* Before installing handler */
Joonyoung Shim5037f8a2011-08-04 05:41:01 +0000411 if (dev->driver->irq_preinstall)
412 dev->driver->irq_preinstall(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000414 /* Install handler */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
Thomas Gleixner935f6e32006-07-01 19:29:34 -0700416 sh_flags = IRQF_SHARED;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000417
Daniel Vetter7c1a38e32013-12-16 11:21:15 +0100418 ret = request_irq(irq, dev->driver->irq_handler,
Daniel Vetter5829d182013-11-03 21:48:48 +0100419 sh_flags, dev->driver->name, dev);
Jesse Barnes9bfbd5c2008-09-15 15:00:33 -0700420
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000421 if (ret < 0) {
Ville Syrjälä44238432013-10-04 14:53:37 +0300422 dev->irq_enabled = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 return ret;
424 }
425
Dave Airlie28d52042009-09-21 14:33:58 +1000426 if (!drm_core_check_feature(dev, DRIVER_MODESET))
427 vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL);
428
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000429 /* After installing handler */
Joonyoung Shim5037f8a2011-08-04 05:41:01 +0000430 if (dev->driver->irq_postinstall)
431 ret = dev->driver->irq_postinstall(dev);
432
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700433 if (ret < 0) {
Ville Syrjälä44238432013-10-04 14:53:37 +0300434 dev->irq_enabled = false;
Joonyoung Shime1c44ac2011-08-04 05:41:00 +0000435 if (!drm_core_check_feature(dev, DRIVER_MODESET))
436 vga_client_register(dev->pdev, NULL, NULL, NULL);
Daniel Vetter7c1a38e32013-12-16 11:21:15 +0100437 free_irq(irq, dev);
438 } else {
439 dev->irq = irq;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700440 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700442 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443}
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700444EXPORT_SYMBOL(drm_irq_install);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
446/**
Daniel Vetterf5752b32014-05-08 16:41:51 +0200447 * drm_irq_uninstall - uninstall the IRQ handler
448 * @dev: DRM device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 *
Daniel Vetterf5752b32014-05-08 16:41:51 +0200450 * Calls the driver's irq_uninstall() function and unregisters the IRQ handler.
451 * This should only be called by drivers which used drm_irq_install() to set up
452 * their interrupt handler. Other drivers must only reset
453 * drm_device->irq_enabled to false.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 *
Daniel Vetterf5752b32014-05-08 16:41:51 +0200455 * Note that for kernel modesetting drivers it is a bug if this function fails.
456 * The sanity checks are only to catch buggy user modesetting drivers which call
457 * the same function through an ioctl.
458 *
459 * Returns:
460 * Zero on success or a negative error code on failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 */
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200462int drm_irq_uninstall(struct drm_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463{
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800464 unsigned long irqflags;
Ville Syrjälä44238432013-10-04 14:53:37 +0300465 bool irq_enabled;
466 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
468 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
469 return -EINVAL;
470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 irq_enabled = dev->irq_enabled;
Ville Syrjälä44238432013-10-04 14:53:37 +0300472 dev->irq_enabled = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800474 /*
Daniel Vetter3bff93d2015-02-22 15:11:19 +0100475 * Wake up any waiters so they don't hang. This is just to paper over
476 * isssues for UMS drivers which aren't in full control of their
477 * vblank/irq handling. KMS drivers must ensure that vblanks are all
478 * disabled when uninstalling the irq handler.
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800479 */
Ben Skeggsbde48892011-07-04 12:52:27 +1000480 if (dev->num_crtcs) {
481 spin_lock_irqsave(&dev->vbl_lock, irqflags);
482 for (i = 0; i < dev->num_crtcs; i++) {
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300483 struct drm_vblank_crtc *vblank = &dev->vblank[i];
484
Daniel Vetter3bff93d2015-02-22 15:11:19 +0100485 if (!vblank->enabled)
486 continue;
487
488 WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET));
489
490 vblank_disable_and_save(dev, i);
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300491 wake_up(&vblank->queue);
Ben Skeggsbde48892011-07-04 12:52:27 +1000492 }
493 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800494 }
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800495
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000496 if (!irq_enabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 return -EINVAL;
498
Daniel Vetter7c1a38e32013-12-16 11:21:15 +0100499 DRM_DEBUG("irq=%d\n", dev->irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
Dave Airlie28d52042009-09-21 14:33:58 +1000501 if (!drm_core_check_feature(dev, DRIVER_MODESET))
502 vga_client_register(dev->pdev, NULL, NULL, NULL);
503
Joonyoung Shim5037f8a2011-08-04 05:41:01 +0000504 if (dev->driver->irq_uninstall)
505 dev->driver->irq_uninstall(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
Daniel Vetter7c1a38e32013-12-16 11:21:15 +0100507 free_irq(dev->irq, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
509 return 0;
510}
511EXPORT_SYMBOL(drm_irq_uninstall);
512
Daniel Vetterf5752b32014-05-08 16:41:51 +0200513/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 * IRQ control ioctl.
515 *
516 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +1000517 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 * \param cmd command.
519 * \param arg user argument, pointing to a drm_control structure.
520 * \return zero on success or a negative number on failure.
521 *
522 * Calls irq_install() or irq_uninstall() according to \p arg.
523 */
Eric Anholtc153f452007-09-03 12:06:45 +1000524int drm_control(struct drm_device *dev, void *data,
525 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526{
Eric Anholtc153f452007-09-03 12:06:45 +1000527 struct drm_control *ctl = data;
Daniel Vettera319c1a2013-11-03 21:09:15 +0100528 int ret = 0, irq;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000529
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200530 /* if we haven't irq we fallback for compatibility reasons -
531 * this used to be a separate function in drm_dma.h
532 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Daniel Vetter22471cf2013-11-03 20:02:50 +0100534 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
535 return 0;
536 if (drm_core_check_feature(dev, DRIVER_MODESET))
537 return 0;
538 /* UMS was only ever support on pci devices. */
539 if (WARN_ON(!dev->pdev))
540 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
Eric Anholtc153f452007-09-03 12:06:45 +1000542 switch (ctl->func) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 case DRM_INST_HANDLER:
Daniel Vettera319c1a2013-11-03 21:09:15 +0100544 irq = dev->pdev->irq;
545
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
Daniel Vettera319c1a2013-11-03 21:09:15 +0100547 ctl->irq != irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 return -EINVAL;
Daniel Vettere090c532013-11-03 20:27:05 +0100549 mutex_lock(&dev->struct_mutex);
Daniel Vetterbb0f1b52013-11-03 21:09:27 +0100550 ret = drm_irq_install(dev, irq);
Daniel Vettere090c532013-11-03 20:27:05 +0100551 mutex_unlock(&dev->struct_mutex);
552
553 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 case DRM_UNINST_HANDLER:
Daniel Vettere090c532013-11-03 20:27:05 +0100555 mutex_lock(&dev->struct_mutex);
556 ret = drm_irq_uninstall(dev);
557 mutex_unlock(&dev->struct_mutex);
558
559 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 default:
561 return -EINVAL;
562 }
563}
564
565/**
Daniel Vetterf5752b32014-05-08 16:41:51 +0200566 * drm_calc_timestamping_constants - calculate vblank timestamp constants
567 * @crtc: drm_crtc whose timestamp constants should be updated.
568 * @mode: display mode containing the scanout timings
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200569 *
Ville Syrjälä21b21562013-10-26 17:22:52 +0300570 * Calculate and store various constants which are later
571 * needed by vblank and swap-completion timestamping, e.g,
572 * by drm_calc_vbltimestamp_from_scanoutpos(). They are
Daniel Vetterf5752b32014-05-08 16:41:51 +0200573 * derived from CRTC's true scanout timing, so they take
Ville Syrjälä21b21562013-10-26 17:22:52 +0300574 * things like panel scaling or other adjustments into account.
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200575 */
Ville Syrjälä545cdd52013-10-26 17:16:30 +0300576void drm_calc_timestamping_constants(struct drm_crtc *crtc,
577 const struct drm_display_mode *mode)
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200578{
Ville Syrjälä3c184f62013-10-26 17:38:52 +0300579 int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0;
Ville Syrjälä77666b722013-10-27 21:22:58 +0200580 int dotclock = mode->crtc_clock;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200581
582 /* Valid dotclock? */
583 if (dotclock > 0) {
Ville Syrjälä0dae35a2013-10-26 17:11:01 +0300584 int frame_size = mode->crtc_htotal * mode->crtc_vtotal;
585
586 /*
587 * Convert scanline length in pixels and video
588 * dot clock to line duration, frame duration
589 * and pixel duration in nanoseconds:
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200590 */
Ville Syrjälä0dae35a2013-10-26 17:11:01 +0300591 pixeldur_ns = 1000000 / dotclock;
592 linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock);
593 framedur_ns = div_u64((u64) frame_size * 1000000, dotclock);
Ville Syrjäläc0ae24c2013-10-28 19:53:25 +0200594
595 /*
596 * Fields of interlaced scanout modes are only half a frame duration.
597 */
598 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
599 framedur_ns /= 2;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200600 } else
601 DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n",
602 crtc->base.id);
603
604 crtc->pixeldur_ns = pixeldur_ns;
605 crtc->linedur_ns = linedur_ns;
606 crtc->framedur_ns = framedur_ns;
607
608 DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n",
Ville Syrjälä545cdd52013-10-26 17:16:30 +0300609 crtc->base.id, mode->crtc_htotal,
610 mode->crtc_vtotal, mode->crtc_vdisplay);
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200611 DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n",
Ville Syrjälä3c184f62013-10-26 17:38:52 +0300612 crtc->base.id, dotclock, framedur_ns,
613 linedur_ns, pixeldur_ns);
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200614}
615EXPORT_SYMBOL(drm_calc_timestamping_constants);
616
617/**
Daniel Vetterf5752b32014-05-08 16:41:51 +0200618 * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper
619 * @dev: DRM device
620 * @crtc: Which CRTC's vblank timestamp to retrieve
621 * @max_error: Desired maximum allowable error in timestamps (nanosecs)
622 * On return contains true maximum error of timestamp
623 * @vblank_time: Pointer to struct timeval which should receive the timestamp
624 * @flags: Flags to pass to driver:
625 * 0 = Default,
626 * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
627 * @refcrtc: CRTC which defines scanout timing
628 * @mode: mode which defines the scanout timings
629 *
630 * Implements calculation of exact vblank timestamps from given drm_display_mode
631 * timings and current video scanout position of a CRTC. This can be called from
632 * within get_vblank_timestamp() implementation of a kms driver to implement the
633 * actual timestamping.
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200634 *
635 * Should return timestamps conforming to the OML_sync_control OpenML
636 * extension specification. The timestamp corresponds to the end of
637 * the vblank interval, aka start of scanout of topmost-leftmost display
638 * pixel in the following video frame.
639 *
640 * Requires support for optional dev->driver->get_scanout_position()
641 * in kms driver, plus a bit of setup code to provide a drm_display_mode
642 * that corresponds to the true scanout timing.
643 *
644 * The current implementation only handles standard video modes. It
645 * returns as no operation if a doublescan or interlaced video mode is
646 * active. Higher level code is expected to handle this.
647 *
Daniel Vetterf5752b32014-05-08 16:41:51 +0200648 * Returns:
649 * Negative value on error, failure or if not supported in current
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200650 * video mode:
651 *
Daniel Vetterf5752b32014-05-08 16:41:51 +0200652 * -EINVAL - Invalid CRTC.
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200653 * -EAGAIN - Temporary unavailable, e.g., called before initial modeset.
654 * -ENOTSUPP - Function not supported in current display mode.
655 * -EIO - Failed, e.g., due to failed scanout position query.
656 *
657 * Returns or'ed positive status flags on success:
658 *
659 * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.
660 * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.
661 *
662 */
663int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
664 int *max_error,
665 struct timeval *vblank_time,
666 unsigned flags,
Ville Syrjälä7da903e2013-10-26 17:57:31 +0300667 const struct drm_crtc *refcrtc,
668 const struct drm_display_mode *mode)
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200669{
Imre Deake62f2f52012-10-23 18:53:25 +0000670 struct timeval tv_etime;
Thomas Gleixnerd2cb58c2014-07-16 21:04:26 +0000671 ktime_t stime, etime;
Ville Syrjälä8072bfa2013-10-28 21:22:52 +0200672 int vbl_status;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200673 int vpos, hpos, i;
Ville Syrjälä3c184f62013-10-26 17:38:52 +0300674 int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200675 bool invbl;
676
677 if (crtc < 0 || crtc >= dev->num_crtcs) {
678 DRM_ERROR("Invalid crtc %d\n", crtc);
679 return -EINVAL;
680 }
681
682 /* Scanout position query not supported? Should not happen. */
683 if (!dev->driver->get_scanout_position) {
684 DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
685 return -EIO;
686 }
687
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200688 /* Durations of frames, lines, pixels in nanoseconds. */
689 framedur_ns = refcrtc->framedur_ns;
690 linedur_ns = refcrtc->linedur_ns;
691 pixeldur_ns = refcrtc->pixeldur_ns;
692
693 /* If mode timing undefined, just return as no-op:
694 * Happens during initial modesetting of a crtc.
695 */
Ville Syrjälä8072bfa2013-10-28 21:22:52 +0200696 if (framedur_ns == 0) {
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200697 DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc);
698 return -EAGAIN;
699 }
700
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200701 /* Get current scanout position with system timestamp.
702 * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times
703 * if single query takes longer than max_error nanoseconds.
704 *
705 * This guarantees a tight bound on maximum error if
706 * code gets preempted or delayed for some reason.
707 */
708 for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) {
Mario Kleiner8f6fce02013-10-30 05:13:06 +0100709 /*
710 * Get vertical and horizontal scanout position vpos, hpos,
711 * and bounding timestamps stime, etime, pre/post query.
712 */
Ville Syrjäläabca9e452013-10-28 20:50:48 +0200713 vbl_status = dev->driver->get_scanout_position(dev, crtc, flags, &vpos,
Mario Kleiner8f6fce02013-10-30 05:13:06 +0100714 &hpos, &stime, &etime);
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200715
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200716 /* Return as no-op if scanout query unsupported or failed. */
717 if (!(vbl_status & DRM_SCANOUTPOS_VALID)) {
718 DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n",
719 crtc, vbl_status);
720 return -EIO;
721 }
722
Mario Kleiner8f6fce02013-10-30 05:13:06 +0100723 /* Compute uncertainty in timestamp of scanout position query. */
Imre Deake62f2f52012-10-23 18:53:25 +0000724 duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime);
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200725
726 /* Accept result with < max_error nsecs timing uncertainty. */
Ville Syrjälä3c184f62013-10-26 17:38:52 +0300727 if (duration_ns <= *max_error)
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200728 break;
729 }
730
731 /* Noisy system timing? */
732 if (i == DRM_TIMESTAMP_MAXRETRIES) {
733 DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n",
Ville Syrjälä3c184f62013-10-26 17:38:52 +0300734 crtc, duration_ns/1000, *max_error/1000, i);
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200735 }
736
737 /* Return upper bound of timestamp precision error. */
Ville Syrjälä3c184f62013-10-26 17:38:52 +0300738 *max_error = duration_ns;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200739
740 /* Check if in vblank area:
741 * vpos is >=0 in video scanout area, but negative
742 * within vblank area, counting down the number of lines until
743 * start of scanout.
744 */
Daniel Vetter3d3cbd82014-09-10 17:36:11 +0200745 invbl = vbl_status & DRM_SCANOUTPOS_IN_VBLANK;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200746
747 /* Convert scanout position into elapsed time at raw_time query
748 * since start of scanout at first display scanline. delta_ns
749 * can be negative if start of scanout hasn't happened yet.
750 */
Ville Syrjälä3c184f62013-10-26 17:38:52 +0300751 delta_ns = vpos * linedur_ns + hpos * pixeldur_ns;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200752
Imre Deakc61eef72012-10-23 18:53:26 +0000753 if (!drm_timestamp_monotonic)
Thomas Gleixnerd2cb58c2014-07-16 21:04:26 +0000754 etime = ktime_mono_to_real(etime);
Imre Deakc61eef72012-10-23 18:53:26 +0000755
Imre Deake62f2f52012-10-23 18:53:25 +0000756 /* save this only for debugging purposes */
757 tv_etime = ktime_to_timeval(etime);
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200758 /* Subtract time delta from raw timestamp to get final
759 * vblank_time timestamp for end of vblank.
760 */
Michel Dänzere91abf82013-06-12 11:58:44 +0200761 if (delta_ns < 0)
762 etime = ktime_add_ns(etime, -delta_ns);
763 else
764 etime = ktime_sub_ns(etime, delta_ns);
Imre Deake62f2f52012-10-23 18:53:25 +0000765 *vblank_time = ktime_to_timeval(etime);
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200766
Joe Perchesbbb0aef52011-04-17 20:35:52 -0700767 DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",
768 crtc, (int)vbl_status, hpos, vpos,
Imre Deake62f2f52012-10-23 18:53:25 +0000769 (long)tv_etime.tv_sec, (long)tv_etime.tv_usec,
Joe Perchesbbb0aef52011-04-17 20:35:52 -0700770 (long)vblank_time->tv_sec, (long)vblank_time->tv_usec,
Ville Syrjälä3c184f62013-10-26 17:38:52 +0300771 duration_ns/1000, i);
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200772
773 vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD;
774 if (invbl)
Daniel Vetter3d3cbd82014-09-10 17:36:11 +0200775 vbl_status |= DRM_VBLANKTIME_IN_VBLANK;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200776
777 return vbl_status;
778}
779EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
780
Imre Deakc61eef72012-10-23 18:53:26 +0000781static struct timeval get_drm_timestamp(void)
782{
783 ktime_t now;
784
Thomas Gleixnerd2cb58c2014-07-16 21:04:26 +0000785 now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real();
Imre Deakc61eef72012-10-23 18:53:26 +0000786 return ktime_to_timeval(now);
787}
788
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200789/**
790 * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent
Thierry Reding4dfd9092014-12-10 13:03:34 +0100791 * vblank interval
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200792 * @dev: DRM device
Daniel Vetterf5752b32014-05-08 16:41:51 +0200793 * @crtc: which CRTC's vblank timestamp to retrieve
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200794 * @tvblank: Pointer to target struct timeval which should receive the timestamp
795 * @flags: Flags to pass to driver:
Daniel Vetterf5752b32014-05-08 16:41:51 +0200796 * 0 = Default,
797 * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200798 *
799 * Fetches the system timestamp corresponding to the time of the most recent
Daniel Vetterf5752b32014-05-08 16:41:51 +0200800 * vblank interval on specified CRTC. May call into kms-driver to
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200801 * compute the timestamp with a high-precision GPU specific method.
802 *
803 * Returns zero if timestamp originates from uncorrected do_gettimeofday()
804 * call, i.e., it isn't very precisely locked to the true vblank.
805 *
Daniel Vetterf5752b32014-05-08 16:41:51 +0200806 * Returns:
Daniel Vetterfb446a12014-09-10 17:36:10 +0200807 * True if timestamp is considered to be very precise, false otherwise.
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200808 */
Daniel Vetterfb446a12014-09-10 17:36:10 +0200809static bool
810drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
811 struct timeval *tvblank, unsigned flags)
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200812{
Laurent Pinchart4a1b0712012-05-17 13:27:21 +0200813 int ret;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200814
815 /* Define requested maximum error on timestamps (nanoseconds). */
816 int max_error = (int) drm_timestamp_precision * 1000;
817
818 /* Query driver if possible and precision timestamping enabled. */
819 if (dev->driver->get_vblank_timestamp && (max_error > 0)) {
820 ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error,
821 tvblank, flags);
822 if (ret > 0)
Daniel Vetterfb446a12014-09-10 17:36:10 +0200823 return true;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200824 }
825
826 /* GPU high precision timestamp query unsupported or failed.
Imre Deakc61eef72012-10-23 18:53:26 +0000827 * Return current monotonic/gettimeofday timestamp as best estimate.
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200828 */
Imre Deakc61eef72012-10-23 18:53:26 +0000829 *tvblank = get_drm_timestamp();
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200830
Daniel Vetterfb446a12014-09-10 17:36:10 +0200831 return false;
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200832}
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200833
834/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700835 * drm_vblank_count - retrieve "cooked" vblank counter value
836 * @dev: DRM device
837 * @crtc: which counter to retrieve
838 *
839 * Fetches the "cooked" vblank count value that represents the number of
840 * vblank events since the system was booted, including lost events due to
841 * modesetting activity.
Daniel Vetterf5752b32014-05-08 16:41:51 +0200842 *
Thierry Reding96d3f912014-12-16 13:08:47 +0100843 * This is the legacy version of drm_crtc_vblank_count().
844 *
Daniel Vetterf5752b32014-05-08 16:41:51 +0200845 * Returns:
846 * The software vblank counter.
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700847 */
848u32 drm_vblank_count(struct drm_device *dev, int crtc)
849{
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300850 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
851
Rob Clarke6ae8682014-08-06 13:16:59 -0400852 if (WARN_ON(crtc >= dev->num_crtcs))
853 return 0;
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300854 return atomic_read(&vblank->count);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700855}
856EXPORT_SYMBOL(drm_vblank_count);
857
858/**
Thierry Reding96d3f912014-12-16 13:08:47 +0100859 * drm_crtc_vblank_count - retrieve "cooked" vblank counter value
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.
865 *
866 * This is the native KMS version of drm_vblank_count().
867 *
868 * Returns:
869 * The software vblank counter.
870 */
871u32 drm_crtc_vblank_count(struct drm_crtc *crtc)
872{
873 return drm_vblank_count(crtc->dev, drm_crtc_index(crtc));
874}
875EXPORT_SYMBOL(drm_crtc_vblank_count);
876
877/**
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200878 * drm_vblank_count_and_time - retrieve "cooked" vblank counter value
879 * and the system timestamp corresponding to that vblank counter value.
880 *
881 * @dev: DRM device
882 * @crtc: which counter to retrieve
883 * @vblanktime: Pointer to struct timeval to receive the vblank timestamp.
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. Returns corresponding system timestamp of the time
Daniel Vetterf5752b32014-05-08 16:41:51 +0200888 * of the vblank interval that corresponds to the current vblank counter value.
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200889 */
890u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc,
891 struct timeval *vblanktime)
892{
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300893 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200894 u32 cur_vblank;
895
Rob Clarke6ae8682014-08-06 13:16:59 -0400896 if (WARN_ON(crtc >= dev->num_crtcs))
897 return 0;
898
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200899 /* Read timestamp from slot of _vblank_time ringbuffer
900 * that corresponds to current vblank count. Retry if
901 * count has incremented during readout. This works like
902 * a seqlock.
903 */
904 do {
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300905 cur_vblank = atomic_read(&vblank->count);
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200906 *vblanktime = vblanktimestamp(dev, crtc, cur_vblank);
907 smp_rmb();
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300908 } while (cur_vblank != atomic_read(&vblank->count));
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200909
910 return cur_vblank;
911}
912EXPORT_SYMBOL(drm_vblank_count_and_time);
913
Rob Clarkc6eefa12012-10-16 22:48:40 +0000914static void send_vblank_event(struct drm_device *dev,
915 struct drm_pending_vblank_event *e,
916 unsigned long seq, struct timeval *now)
917{
918 WARN_ON_SMP(!spin_is_locked(&dev->event_lock));
919 e->event.sequence = seq;
920 e->event.tv_sec = now->tv_sec;
921 e->event.tv_usec = now->tv_usec;
922
923 list_add_tail(&e->base.link,
924 &e->base.file_priv->event_list);
925 wake_up_interruptible(&e->base.file_priv->event_wait);
926 trace_drm_vblank_event_delivered(e->base.pid, e->pipe,
927 e->event.sequence);
928}
929
930/**
931 * drm_send_vblank_event - helper to send vblank event after pageflip
932 * @dev: DRM device
933 * @crtc: CRTC in question
934 * @e: the event to send
935 *
936 * Updates sequence # and timestamp on event, and sends it to userspace.
937 * Caller must hold event lock.
Thierry Redinga4d7b302014-12-15 14:47:18 +0100938 *
939 * This is the legacy version of drm_crtc_send_vblank_event().
Rob Clarkc6eefa12012-10-16 22:48:40 +0000940 */
941void drm_send_vblank_event(struct drm_device *dev, int crtc,
942 struct drm_pending_vblank_event *e)
943{
944 struct timeval now;
945 unsigned int seq;
Thierry Reding4dfd9092014-12-10 13:03:34 +0100946
Rob Clarkc6eefa12012-10-16 22:48:40 +0000947 if (crtc >= 0) {
948 seq = drm_vblank_count_and_time(dev, crtc, &now);
949 } else {
950 seq = 0;
Imre Deakc61eef72012-10-23 18:53:26 +0000951
952 now = get_drm_timestamp();
Rob Clarkc6eefa12012-10-16 22:48:40 +0000953 }
Rob Clark21a245d2012-12-10 10:49:46 -0600954 e->pipe = crtc;
Rob Clarkc6eefa12012-10-16 22:48:40 +0000955 send_vblank_event(dev, e, seq, &now);
956}
957EXPORT_SYMBOL(drm_send_vblank_event);
958
Mario Kleiner27641c3f2010-10-23 04:20:23 +0200959/**
Thierry Redinga4d7b302014-12-15 14:47:18 +0100960 * drm_crtc_send_vblank_event - helper to send vblank event after pageflip
961 * @crtc: the source CRTC of the vblank event
962 * @e: the event to send
963 *
964 * Updates sequence # and timestamp on event, and sends it to userspace.
965 * Caller must hold event lock.
966 *
967 * This is the native KMS version of drm_send_vblank_event().
968 */
969void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
970 struct drm_pending_vblank_event *e)
971{
972 drm_send_vblank_event(crtc->dev, drm_crtc_index(crtc), e);
973}
974EXPORT_SYMBOL(drm_crtc_send_vblank_event);
975
976/**
Ville Syrjäläf2752282014-02-19 21:29:49 +0200977 * drm_vblank_enable - enable the vblank interrupt on a CRTC
978 * @dev: DRM device
979 * @crtc: CRTC in question
980 */
981static int drm_vblank_enable(struct drm_device *dev, int crtc)
982{
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300983 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
Ville Syrjäläf2752282014-02-19 21:29:49 +0200984 int ret = 0;
985
986 assert_spin_locked(&dev->vbl_lock);
987
988 spin_lock(&dev->vblank_time_lock);
989
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +0300990 if (!vblank->enabled) {
Daniel Vetter1cfb80b2014-05-21 15:11:33 +0200991 /*
992 * Enable vblank irqs under vblank_time_lock protection.
Ville Syrjäläf2752282014-02-19 21:29:49 +0200993 * All vblank count & timestamp updates are held off
994 * until we are done reinitializing master counter and
995 * timestamps. Filtercode in drm_handle_vblank() will
996 * prevent double-accounting of same vblank interval.
997 */
998 ret = dev->driver->enable_vblank(dev, crtc);
999 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret);
1000 if (ret)
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001001 atomic_dec(&vblank->refcount);
Ville Syrjäläf2752282014-02-19 21:29:49 +02001002 else {
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001003 vblank->enabled = true;
Ville Syrjäläf2752282014-02-19 21:29:49 +02001004 drm_update_vblank_count(dev, crtc);
1005 }
1006 }
1007
1008 spin_unlock(&dev->vblank_time_lock);
1009
1010 return ret;
1011}
1012
1013/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001014 * drm_vblank_get - get a reference count on vblank events
1015 * @dev: DRM device
1016 * @crtc: which CRTC to own
1017 *
1018 * Acquire a reference count on vblank events to avoid having them disabled
1019 * while in use.
1020 *
Daniel Vetter89dd6a42014-05-15 15:32:12 +02001021 * This is the legacy version of drm_crtc_vblank_get().
1022 *
Daniel Vetterf5752b32014-05-08 16:41:51 +02001023 * Returns:
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001024 * Zero on success, nonzero on failure.
1025 */
1026int drm_vblank_get(struct drm_device *dev, int crtc)
1027{
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001028 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
Peter Hurley97cbc882013-08-20 21:51:12 -04001029 unsigned long irqflags;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001030 int ret = 0;
1031
Rob Clarke6ae8682014-08-06 13:16:59 -04001032 if (WARN_ON(crtc >= dev->num_crtcs))
1033 return -EINVAL;
1034
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001035 spin_lock_irqsave(&dev->vbl_lock, irqflags);
1036 /* Going from 0->1 means we have to enable interrupts again */
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001037 if (atomic_add_return(1, &vblank->refcount) == 1) {
Ville Syrjäläf2752282014-02-19 21:29:49 +02001038 ret = drm_vblank_enable(dev, crtc);
Li Peng778c9022009-11-09 12:51:22 +08001039 } else {
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001040 if (!vblank->enabled) {
1041 atomic_dec(&vblank->refcount);
Li Peng778c9022009-11-09 12:51:22 +08001042 ret = -EINVAL;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001043 }
1044 }
1045 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
1046
1047 return ret;
1048}
1049EXPORT_SYMBOL(drm_vblank_get);
1050
1051/**
Daniel Vetter89dd6a42014-05-15 15:32:12 +02001052 * drm_crtc_vblank_get - get a reference count on vblank events
1053 * @crtc: which CRTC to own
1054 *
1055 * Acquire a reference count on vblank events to avoid having them disabled
1056 * while in use.
1057 *
Damien Lespiau30b79f02015-02-13 15:53:31 +00001058 * This is the native kms version of drm_vblank_get().
Daniel Vetter89dd6a42014-05-15 15:32:12 +02001059 *
1060 * Returns:
1061 * Zero on success, nonzero on failure.
1062 */
1063int drm_crtc_vblank_get(struct drm_crtc *crtc)
1064{
1065 return drm_vblank_get(crtc->dev, drm_crtc_index(crtc));
1066}
1067EXPORT_SYMBOL(drm_crtc_vblank_get);
1068
1069/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001070 * drm_vblank_put - give up ownership of vblank events
1071 * @dev: DRM device
1072 * @crtc: which counter to give up
1073 *
1074 * Release ownership of a given vblank counter, turning off interrupts
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001075 * if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
Daniel Vetter89dd6a42014-05-15 15:32:12 +02001076 *
1077 * This is the legacy version of drm_crtc_vblank_put().
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001078 */
1079void drm_vblank_put(struct drm_device *dev, int crtc)
1080{
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001081 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
1082
Rob Clark7f907bf22014-11-08 10:16:19 -05001083 if (WARN_ON(atomic_read(&vblank->refcount) == 0))
1084 return;
Chris Wilsonb3f5e732009-02-19 14:48:22 +00001085
Rob Clarke6ae8682014-08-06 13:16:59 -04001086 if (WARN_ON(crtc >= dev->num_crtcs))
1087 return;
1088
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001089 /* Last user schedules interrupt disable */
Ville Syrjälä4ed0ce32014-08-06 14:49:53 +03001090 if (atomic_dec_and_test(&vblank->refcount)) {
Daniel Vetterab8905f2014-09-10 17:36:08 +02001091 if (drm_vblank_offdelay == 0)
1092 return;
1093 else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0)
Ville Syrjälä4ed0ce32014-08-06 14:49:53 +03001094 vblank_disable_fn((unsigned long)vblank);
Daniel Vetterab8905f2014-09-10 17:36:08 +02001095 else
Ville Syrjälä4ed0ce32014-08-06 14:49:53 +03001096 mod_timer(&vblank->disable_timer,
1097 jiffies + ((drm_vblank_offdelay * HZ)/1000));
1098 }
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001099}
1100EXPORT_SYMBOL(drm_vblank_put);
1101
Rob Clarkc6eefa12012-10-16 22:48:40 +00001102/**
Daniel Vetter89dd6a42014-05-15 15:32:12 +02001103 * drm_crtc_vblank_put - give up ownership of vblank events
1104 * @crtc: which counter to give up
1105 *
1106 * Release ownership of a given vblank counter, turning off interrupts
1107 * if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
1108 *
1109 * This is the native kms version of drm_vblank_put().
1110 */
1111void drm_crtc_vblank_put(struct drm_crtc *crtc)
1112{
1113 drm_vblank_put(crtc->dev, drm_crtc_index(crtc));
1114}
1115EXPORT_SYMBOL(drm_crtc_vblank_put);
1116
1117/**
Daniel Vettere8450f52014-07-25 23:34:03 +02001118 * drm_wait_one_vblank - wait for one vblank
1119 * @dev: DRM device
1120 * @crtc: crtc index
1121 *
1122 * This waits for one vblank to pass on @crtc, using the irq driver interfaces.
1123 * It is a failure to call this when the vblank irq for @crtc is disabled, e.g.
1124 * due to lack of driver support or because the crtc is off.
1125 */
1126void drm_wait_one_vblank(struct drm_device *dev, int crtc)
1127{
1128 int ret;
1129 u32 last;
1130
1131 ret = drm_vblank_get(dev, crtc);
Daniel Vetter80c873b2014-09-15 14:04:28 +02001132 if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", crtc, ret))
Daniel Vettere8450f52014-07-25 23:34:03 +02001133 return;
1134
1135 last = drm_vblank_count(dev, crtc);
1136
1137 ret = wait_event_timeout(dev->vblank[crtc].queue,
1138 last != drm_vblank_count(dev, crtc),
1139 msecs_to_jiffies(100));
1140
Daniel Vetter80c873b2014-09-15 14:04:28 +02001141 WARN(ret == 0, "vblank wait timed out on crtc %i\n", crtc);
Daniel Vettere8450f52014-07-25 23:34:03 +02001142
1143 drm_vblank_put(dev, crtc);
1144}
1145EXPORT_SYMBOL(drm_wait_one_vblank);
1146
1147/**
1148 * drm_crtc_wait_one_vblank - wait for one vblank
1149 * @crtc: DRM crtc
1150 *
1151 * This waits for one vblank to pass on @crtc, using the irq driver interfaces.
1152 * It is a failure to call this when the vblank irq for @crtc is disabled, e.g.
1153 * due to lack of driver support or because the crtc is off.
1154 */
1155void drm_crtc_wait_one_vblank(struct drm_crtc *crtc)
1156{
1157 drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc));
1158}
1159EXPORT_SYMBOL(drm_crtc_wait_one_vblank);
1160
1161/**
Rob Clarkc6eefa12012-10-16 22:48:40 +00001162 * drm_vblank_off - disable vblank events on a CRTC
1163 * @dev: DRM device
1164 * @crtc: CRTC in question
1165 *
Daniel Vetterf5752b32014-05-08 16:41:51 +02001166 * Drivers can use this function to shut down the vblank interrupt handling when
1167 * disabling a crtc. This function ensures that the latest vblank frame count is
1168 * stored so that drm_vblank_on() can restore it again.
1169 *
1170 * Drivers must use this function when the hardware vblank counter can get
1171 * reset, e.g. when suspending.
Daniel Vetter89dd6a42014-05-15 15:32:12 +02001172 *
1173 * This is the legacy version of drm_crtc_vblank_off().
Rob Clarkc6eefa12012-10-16 22:48:40 +00001174 */
Li Peng778c9022009-11-09 12:51:22 +08001175void drm_vblank_off(struct drm_device *dev, int crtc)
1176{
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001177 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001178 struct drm_pending_vblank_event *e, *t;
1179 struct timeval now;
Li Peng778c9022009-11-09 12:51:22 +08001180 unsigned long irqflags;
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001181 unsigned int seq;
Li Peng778c9022009-11-09 12:51:22 +08001182
Rob Clarke6ae8682014-08-06 13:16:59 -04001183 if (WARN_ON(crtc >= dev->num_crtcs))
1184 return;
1185
Ville Syrjälä56cc2792014-08-06 14:49:51 +03001186 spin_lock_irqsave(&dev->event_lock, irqflags);
1187
1188 spin_lock(&dev->vbl_lock);
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001189 vblank_disable_and_save(dev, crtc);
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001190 wake_up(&vblank->queue);
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001191
Ville Syrjälä56cc2792014-08-06 14:49:51 +03001192 /*
1193 * Prevent subsequent drm_vblank_get() from re-enabling
1194 * the vblank interrupt by bumping the refcount.
1195 */
1196 if (!vblank->inmodeset) {
1197 atomic_inc(&vblank->refcount);
1198 vblank->inmodeset = 1;
1199 }
1200 spin_unlock(&dev->vbl_lock);
1201
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001202 /* Send any queued vblank events, lest the natives grow disquiet */
1203 seq = drm_vblank_count_and_time(dev, crtc, &now);
Imre Deake7783ba2012-11-02 13:30:50 +02001204
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001205 list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
1206 if (e->pipe != crtc)
1207 continue;
1208 DRM_DEBUG("Sending premature vblank event on disable: \
1209 wanted %d, current %d\n",
1210 e->event.sequence, seq);
Rob Clarkc6eefa12012-10-16 22:48:40 +00001211 list_del(&e->base.link);
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001212 drm_vblank_put(dev, e->pipe);
Rob Clarkc6eefa12012-10-16 22:48:40 +00001213 send_vblank_event(dev, e, seq, &now);
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001214 }
Ville Syrjälä56cc2792014-08-06 14:49:51 +03001215 spin_unlock_irqrestore(&dev->event_lock, irqflags);
Li Peng778c9022009-11-09 12:51:22 +08001216}
1217EXPORT_SYMBOL(drm_vblank_off);
1218
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001219/**
Daniel Vetter89dd6a42014-05-15 15:32:12 +02001220 * drm_crtc_vblank_off - disable vblank events on a CRTC
1221 * @crtc: CRTC in question
1222 *
1223 * Drivers can use this function to shut down the vblank interrupt handling when
1224 * disabling a crtc. This function ensures that the latest vblank frame count is
1225 * stored so that drm_vblank_on can restore it again.
1226 *
1227 * Drivers must use this function when the hardware vblank counter can get
1228 * reset, e.g. when suspending.
1229 *
1230 * This is the native kms version of drm_vblank_off().
1231 */
1232void drm_crtc_vblank_off(struct drm_crtc *crtc)
1233{
1234 drm_vblank_off(crtc->dev, drm_crtc_index(crtc));
1235}
1236EXPORT_SYMBOL(drm_crtc_vblank_off);
1237
1238/**
Daniel Vetter96256042015-02-13 21:03:42 +01001239 * drm_crtc_vblank_reset - reset vblank state to off on a CRTC
1240 * @crtc: CRTC in question
1241 *
1242 * Drivers can use this function to reset the vblank state to off at load time.
1243 * Drivers should use this together with the drm_crtc_vblank_off() and
1244 * drm_crtc_vblank_on() functions. The difference compared to
1245 * drm_crtc_vblank_off() is that this function doesn't save the vblank counter
1246 * and hence doesn't need to call any driver hooks.
1247 */
1248void drm_crtc_vblank_reset(struct drm_crtc *drm_crtc)
1249{
1250 struct drm_device *dev = drm_crtc->dev;
1251 unsigned long irqflags;
1252 int crtc = drm_crtc_index(drm_crtc);
1253 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
1254
1255 spin_lock_irqsave(&dev->vbl_lock, irqflags);
1256 /*
1257 * Prevent subsequent drm_vblank_get() from enabling the vblank
1258 * interrupt by bumping the refcount.
1259 */
1260 if (!vblank->inmodeset) {
1261 atomic_inc(&vblank->refcount);
1262 vblank->inmodeset = 1;
1263 }
1264 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
1265
1266 WARN_ON(!list_empty(&dev->vblank_event_list));
1267}
1268EXPORT_SYMBOL(drm_crtc_vblank_reset);
1269
1270/**
Ville Syrjäläf2752282014-02-19 21:29:49 +02001271 * drm_vblank_on - enable vblank events on a CRTC
1272 * @dev: DRM device
1273 * @crtc: CRTC in question
Daniel Vetterf5752b32014-05-08 16:41:51 +02001274 *
1275 * This functions restores the vblank interrupt state captured with
1276 * drm_vblank_off() again. Note that calls to drm_vblank_on() and
Masanari Iida32197aa2014-10-20 23:53:13 +09001277 * drm_vblank_off() can be unbalanced and so can also be unconditionally called
Daniel Vetterf5752b32014-05-08 16:41:51 +02001278 * in driver load code to reflect the current hardware state of the crtc.
Daniel Vetter89dd6a42014-05-15 15:32:12 +02001279 *
1280 * This is the legacy version of drm_crtc_vblank_on().
Ville Syrjäläf2752282014-02-19 21:29:49 +02001281 */
1282void drm_vblank_on(struct drm_device *dev, int crtc)
1283{
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001284 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
Ville Syrjäläf2752282014-02-19 21:29:49 +02001285 unsigned long irqflags;
1286
Rob Clarke6ae8682014-08-06 13:16:59 -04001287 if (WARN_ON(crtc >= dev->num_crtcs))
1288 return;
1289
Ville Syrjäläf2752282014-02-19 21:29:49 +02001290 spin_lock_irqsave(&dev->vbl_lock, irqflags);
Ville Syrjälä7ffd7a62014-08-06 14:49:44 +03001291 /* Drop our private "prevent drm_vblank_get" refcount */
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001292 if (vblank->inmodeset) {
1293 atomic_dec(&vblank->refcount);
1294 vblank->inmodeset = 0;
Ville Syrjälä7ffd7a62014-08-06 14:49:44 +03001295 }
Ville Syrjäläf8ad0282014-08-06 14:49:49 +03001296
1297 /*
1298 * sample the current counter to avoid random jumps
1299 * when drm_vblank_enable() applies the diff
1300 *
1301 * -1 to make sure user will never see the same
1302 * vblank counter value before and after a modeset
1303 */
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001304 vblank->last =
Ville Syrjäläf8ad0282014-08-06 14:49:49 +03001305 (dev->driver->get_vblank_counter(dev, crtc) - 1) &
1306 dev->max_vblank_count;
Ville Syrjäläcd19e522014-08-06 14:49:56 +03001307 /*
1308 * re-enable interrupts if there are users left, or the
1309 * user wishes vblank interrupts to be enabled all the time.
1310 */
1311 if (atomic_read(&vblank->refcount) != 0 ||
1312 (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0))
Ville Syrjäläf2752282014-02-19 21:29:49 +02001313 WARN_ON(drm_vblank_enable(dev, crtc));
1314 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
1315}
1316EXPORT_SYMBOL(drm_vblank_on);
1317
1318/**
Daniel Vetter89dd6a42014-05-15 15:32:12 +02001319 * drm_crtc_vblank_on - enable vblank events on a CRTC
1320 * @crtc: CRTC in question
1321 *
1322 * This functions restores the vblank interrupt state captured with
1323 * drm_vblank_off() again. Note that calls to drm_vblank_on() and
Masanari Iida32197aa2014-10-20 23:53:13 +09001324 * drm_vblank_off() can be unbalanced and so can also be unconditionally called
Daniel Vetter89dd6a42014-05-15 15:32:12 +02001325 * in driver load code to reflect the current hardware state of the crtc.
1326 *
1327 * This is the native kms version of drm_vblank_on().
1328 */
1329void drm_crtc_vblank_on(struct drm_crtc *crtc)
1330{
1331 drm_vblank_on(crtc->dev, drm_crtc_index(crtc));
1332}
1333EXPORT_SYMBOL(drm_crtc_vblank_on);
1334
1335/**
Dave Airlief453ba02008-11-07 14:05:41 -08001336 * drm_vblank_pre_modeset - account for vblanks across mode sets
1337 * @dev: DRM device
1338 * @crtc: CRTC in question
Dave Airlief453ba02008-11-07 14:05:41 -08001339 *
1340 * Account for vblank events across mode setting events, which will likely
1341 * reset the hardware frame counter.
Daniel Vetterf5752b32014-05-08 16:41:51 +02001342 *
1343 * This is done by grabbing a temporary vblank reference to ensure that the
1344 * vblank interrupt keeps running across the modeset sequence. With this the
1345 * software-side vblank frame counting will ensure that there are no jumps or
1346 * discontinuities.
1347 *
1348 * Unfortunately this approach is racy and also doesn't work when the vblank
1349 * interrupt stops running, e.g. across system suspend resume. It is therefore
1350 * highly recommended that drivers use the newer drm_vblank_off() and
1351 * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when
1352 * using "cooked" software vblank frame counters and not relying on any hardware
1353 * counters.
1354 *
1355 * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc
1356 * again.
Dave Airlief453ba02008-11-07 14:05:41 -08001357 */
1358void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
1359{
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001360 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
1361
Huacai Chenb7ea85a2013-05-21 06:23:43 +00001362 /* vblank is not initialized (IRQ not installed ?), or has been freed */
Jerome Glissee77cef92010-01-07 15:39:13 +01001363 if (!dev->num_crtcs)
1364 return;
Rob Clarke6ae8682014-08-06 13:16:59 -04001365
1366 if (WARN_ON(crtc >= dev->num_crtcs))
1367 return;
1368
Dave Airlief453ba02008-11-07 14:05:41 -08001369 /*
1370 * To avoid all the problems that might happen if interrupts
1371 * were enabled/disabled around or between these calls, we just
1372 * have the kernel take a reference on the CRTC (just once though
1373 * to avoid corrupting the count if multiple, mismatch calls occur),
1374 * so that interrupts remain enabled in the interim.
1375 */
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001376 if (!vblank->inmodeset) {
1377 vblank->inmodeset = 0x1;
Chris Wilsonb3f5e732009-02-19 14:48:22 +00001378 if (drm_vblank_get(dev, crtc) == 0)
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001379 vblank->inmodeset |= 0x2;
Dave Airlief453ba02008-11-07 14:05:41 -08001380 }
1381}
1382EXPORT_SYMBOL(drm_vblank_pre_modeset);
1383
Daniel Vetterf5752b32014-05-08 16:41:51 +02001384/**
1385 * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes
1386 * @dev: DRM device
1387 * @crtc: CRTC in question
1388 *
1389 * This function again drops the temporary vblank reference acquired in
1390 * drm_vblank_pre_modeset.
1391 */
Dave Airlief453ba02008-11-07 14:05:41 -08001392void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
1393{
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001394 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
Dave Airlief453ba02008-11-07 14:05:41 -08001395 unsigned long irqflags;
1396
Huacai Chenb7ea85a2013-05-21 06:23:43 +00001397 /* vblank is not initialized (IRQ not installed ?), or has been freed */
1398 if (!dev->num_crtcs)
1399 return;
1400
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001401 if (vblank->inmodeset) {
Dave Airlief453ba02008-11-07 14:05:41 -08001402 spin_lock_irqsave(&dev->vbl_lock, irqflags);
Ville Syrjäläba0bf122013-10-04 14:53:33 +03001403 dev->vblank_disable_allowed = true;
Dave Airlief453ba02008-11-07 14:05:41 -08001404 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
Chris Wilsonb3f5e732009-02-19 14:48:22 +00001405
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001406 if (vblank->inmodeset & 0x2)
Chris Wilsonb3f5e732009-02-19 14:48:22 +00001407 drm_vblank_put(dev, crtc);
1408
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001409 vblank->inmodeset = 0;
Dave Airlief453ba02008-11-07 14:05:41 -08001410 }
1411}
1412EXPORT_SYMBOL(drm_vblank_post_modeset);
1413
Daniel Vetterf5752b32014-05-08 16:41:51 +02001414/*
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001415 * drm_modeset_ctl - handle vblank event counter changes across mode switch
1416 * @DRM_IOCTL_ARGS: standard ioctl arguments
1417 *
1418 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
1419 * ioctls around modesetting so that any lost vblank events are accounted for.
1420 *
1421 * Generally the counter will reset across mode sets. If interrupts are
1422 * enabled around this call, we don't have to do anything since the counter
1423 * will have already been incremented.
1424 */
1425int drm_modeset_ctl(struct drm_device *dev, void *data,
1426 struct drm_file *file_priv)
1427{
1428 struct drm_modeset_ctl *modeset = data;
Dave Airlie19227562011-02-24 08:35:06 +10001429 unsigned int crtc;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001430
1431 /* If drm_vblank_init() hasn't been called yet, just no-op */
1432 if (!dev->num_crtcs)
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001433 return 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001434
Laurent Pinchart29935552012-05-30 00:58:09 +02001435 /* KMS drivers handle this internally */
1436 if (drm_core_check_feature(dev, DRIVER_MODESET))
1437 return 0;
1438
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001439 crtc = modeset->crtc;
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001440 if (crtc >= dev->num_crtcs)
1441 return -EINVAL;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001442
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001443 switch (modeset->cmd) {
1444 case _DRM_PRE_MODESET:
Dave Airlief453ba02008-11-07 14:05:41 -08001445 drm_vblank_pre_modeset(dev, crtc);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001446 break;
1447 case _DRM_POST_MODESET:
Dave Airlief453ba02008-11-07 14:05:41 -08001448 drm_vblank_post_modeset(dev, crtc);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001449 break;
1450 default:
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001451 return -EINVAL;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001452 }
1453
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001454 return 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001455}
1456
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001457static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
1458 union drm_wait_vblank *vblwait,
1459 struct drm_file *file_priv)
1460{
Ville Syrjäläffe7c732014-08-06 14:49:52 +03001461 struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001462 struct drm_pending_vblank_event *e;
1463 struct timeval now;
1464 unsigned long flags;
1465 unsigned int seq;
Chris Wilsonea5d5522010-12-01 19:41:31 +00001466 int ret;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001467
Thierry Redingf76511b2014-12-10 13:03:40 +01001468 e = kzalloc(sizeof(*e), GFP_KERNEL);
Chris Wilsonea5d5522010-12-01 19:41:31 +00001469 if (e == NULL) {
1470 ret = -ENOMEM;
1471 goto err_put;
1472 }
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001473
1474 e->pipe = pipe;
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001475 e->base.pid = current->pid;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001476 e->event.base.type = DRM_EVENT_VBLANK;
Thierry Redingf76511b2014-12-10 13:03:40 +01001477 e->event.base.length = sizeof(e->event);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001478 e->event.user_data = vblwait->request.signal;
1479 e->base.event = &e->event.base;
1480 e->base.file_priv = file_priv;
1481 e->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
1482
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001483 spin_lock_irqsave(&dev->event_lock, flags);
1484
Ville Syrjäläffe7c732014-08-06 14:49:52 +03001485 /*
1486 * drm_vblank_off() might have been called after we called
1487 * drm_vblank_get(). drm_vblank_off() holds event_lock
1488 * around the vblank disable, so no need for further locking.
1489 * The reference from drm_vblank_get() protects against
1490 * vblank disable from another source.
1491 */
1492 if (!vblank->enabled) {
1493 ret = -EINVAL;
1494 goto err_unlock;
1495 }
1496
Thierry Redingf76511b2014-12-10 13:03:40 +01001497 if (file_priv->event_space < sizeof(e->event)) {
Chris Wilsonea5d5522010-12-01 19:41:31 +00001498 ret = -EBUSY;
1499 goto err_unlock;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001500 }
1501
Thierry Redingf76511b2014-12-10 13:03:40 +01001502 file_priv->event_space -= sizeof(e->event);
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001503 seq = drm_vblank_count_and_time(dev, pipe, &now);
1504
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001505 if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) &&
1506 (seq - vblwait->request.sequence) <= (1 << 23)) {
1507 vblwait->request.sequence = seq + 1;
Jesse Barnes4a921642009-11-10 08:21:25 +00001508 vblwait->reply.sequence = vblwait->request.sequence;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001509 }
1510
1511 DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n",
1512 vblwait->request.sequence, seq, pipe);
1513
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001514 trace_drm_vblank_event_queued(current->pid, pipe,
1515 vblwait->request.sequence);
1516
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001517 e->event.sequence = vblwait->request.sequence;
1518 if ((seq - vblwait->request.sequence) <= (1 << 23)) {
Dan Carpenter6f331622010-12-09 08:35:40 +03001519 drm_vblank_put(dev, pipe);
Rob Clarkc6eefa12012-10-16 22:48:40 +00001520 send_vblank_event(dev, e, seq, &now);
Mario Kleiner000fa7c2010-12-10 16:00:19 +01001521 vblwait->reply.sequence = seq;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001522 } else {
Ilija Hadzica6778e92011-10-31 13:11:57 -04001523 /* drm_handle_vblank_events will call drm_vblank_put */
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001524 list_add_tail(&e->base.link, &dev->vblank_event_list);
Mario Kleiner000fa7c2010-12-10 16:00:19 +01001525 vblwait->reply.sequence = vblwait->request.sequence;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001526 }
1527
1528 spin_unlock_irqrestore(&dev->event_lock, flags);
1529
1530 return 0;
Chris Wilsonea5d5522010-12-01 19:41:31 +00001531
1532err_unlock:
1533 spin_unlock_irqrestore(&dev->event_lock, flags);
1534 kfree(e);
1535err_put:
Dan Carpenter6f331622010-12-09 08:35:40 +03001536 drm_vblank_put(dev, pipe);
Chris Wilsonea5d5522010-12-01 19:41:31 +00001537 return ret;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001538}
1539
Daniel Vetterf5752b32014-05-08 16:41:51 +02001540/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 * Wait for VBLANK.
1542 *
1543 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +10001544 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 * \param cmd command.
1546 * \param data user argument, pointing to a drm_wait_vblank structure.
1547 * \return zero on success or a negative number on failure.
1548 *
Eric Anholt30b23632009-01-27 21:19:41 -08001549 * This function enables the vblank interrupt on the pipe requested, then
1550 * sleeps waiting for the requested sequence number to occur, and drops
Daniel Vetterf5752b32014-05-08 16:41:51 +02001551 * the vblank interrupt refcount afterwards. (vblank IRQ disable follows that
Eric Anholt30b23632009-01-27 21:19:41 -08001552 * after a timeout with no further vblank waits scheduled).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001554int drm_wait_vblank(struct drm_device *dev, void *data,
1555 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556{
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001557 struct drm_vblank_crtc *vblank;
Eric Anholtc153f452007-09-03 12:06:45 +10001558 union drm_wait_vblank *vblwait = data;
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001559 int ret;
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001560 unsigned int flags, seq, crtc, high_crtc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561
Daniel Vetter4984979b2013-08-28 15:02:37 +02001562 if (!dev->irq_enabled)
1563 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564
Eric Anholt30b23632009-01-27 21:19:41 -08001565 if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
1566 return -EINVAL;
1567
Eric Anholtc153f452007-09-03 12:06:45 +10001568 if (vblwait->request.type &
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001569 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
1570 _DRM_VBLANK_HIGH_CRTC_MASK)) {
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001571 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
Eric Anholtc153f452007-09-03 12:06:45 +10001572 vblwait->request.type,
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001573 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
1574 _DRM_VBLANK_HIGH_CRTC_MASK));
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001575 return -EINVAL;
1576 }
1577
Eric Anholtc153f452007-09-03 12:06:45 +10001578 flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001579 high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK);
1580 if (high_crtc)
1581 crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT;
1582 else
1583 crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001584 if (crtc >= dev->num_crtcs)
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001585 return -EINVAL;
1586
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001587 vblank = &dev->vblank[crtc];
1588
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001589 ret = drm_vblank_get(dev, crtc);
1590 if (ret) {
Paul Rolland8d3457e2009-08-09 12:24:01 +10001591 DRM_DEBUG("failed to acquire vblank counter, %d\n", ret);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001592 return ret;
1593 }
1594 seq = drm_vblank_count(dev, crtc);
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001595
Eric Anholtc153f452007-09-03 12:06:45 +10001596 switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 case _DRM_VBLANK_RELATIVE:
Eric Anholtc153f452007-09-03 12:06:45 +10001598 vblwait->request.sequence += seq;
1599 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 case _DRM_VBLANK_ABSOLUTE:
1601 break;
1602 default:
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001603 ret = -EINVAL;
1604 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 }
1606
Ilija Hadzica6778e92011-10-31 13:11:57 -04001607 if (flags & _DRM_VBLANK_EVENT) {
1608 /* must hold on to the vblank ref until the event fires
1609 * drm_vblank_put will be called asynchronously
1610 */
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001611 return drm_queue_vblank_event(dev, crtc, vblwait, file_priv);
Ilija Hadzica6778e92011-10-31 13:11:57 -04001612 }
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001613
=?utf-8?q?Michel_D=C3=A4nzer?=ab285d72006-10-24 23:34:18 +10001614 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
Eric Anholtc153f452007-09-03 12:06:45 +10001615 (seq - vblwait->request.sequence) <= (1<<23)) {
1616 vblwait->request.sequence = seq + 1;
=?utf-8?q?Michel_D=C3=A4nzer?=ab285d72006-10-24 23:34:18 +10001617 }
1618
Eric Anholt30b23632009-01-27 21:19:41 -08001619 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
1620 vblwait->request.sequence, crtc);
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001621 vblank->last_wait = vblwait->request.sequence;
1622 DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
Eric Anholt30b23632009-01-27 21:19:41 -08001623 (((drm_vblank_count(dev, crtc) -
1624 vblwait->request.sequence) <= (1 << 23)) ||
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001625 !vblank->enabled ||
Eric Anholt30b23632009-01-27 21:19:41 -08001626 !dev->irq_enabled));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627
Eric Anholt30b23632009-01-27 21:19:41 -08001628 if (ret != -EINTR) {
1629 struct timeval now;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001631 vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now);
Eric Anholt30b23632009-01-27 21:19:41 -08001632 vblwait->reply.tval_sec = now.tv_sec;
1633 vblwait->reply.tval_usec = now.tv_usec;
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001634
Eric Anholt30b23632009-01-27 21:19:41 -08001635 DRM_DEBUG("returning %d to client\n",
1636 vblwait->reply.sequence);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637 } else {
Eric Anholt30b23632009-01-27 21:19:41 -08001638 DRM_DEBUG("vblank wait interrupted by signal\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 }
1640
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001641done:
1642 drm_vblank_put(dev, crtc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 return ret;
1644}
1645
Sachin Kamatea7f7ab2012-08-01 17:15:31 +05301646static void drm_handle_vblank_events(struct drm_device *dev, int crtc)
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001647{
1648 struct drm_pending_vblank_event *e, *t;
1649 struct timeval now;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001650 unsigned int seq;
1651
Ville Syrjälä56cc2792014-08-06 14:49:51 +03001652 assert_spin_locked(&dev->event_lock);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001653
Ville Syrjälä56cc2792014-08-06 14:49:51 +03001654 seq = drm_vblank_count_and_time(dev, crtc, &now);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001655
1656 list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
1657 if (e->pipe != crtc)
1658 continue;
1659 if ((seq - e->event.sequence) > (1<<23))
1660 continue;
1661
1662 DRM_DEBUG("vblank event on %d, current %d\n",
1663 e->event.sequence, seq);
1664
Rob Clarkc6eefa12012-10-16 22:48:40 +00001665 list_del(&e->base.link);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001666 drm_vblank_put(dev, e->pipe);
Rob Clarkc6eefa12012-10-16 22:48:40 +00001667 send_vblank_event(dev, e, seq, &now);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001668 }
1669
Jesse Barnesac2874b2010-07-01 16:47:31 -07001670 trace_drm_vblank_event(crtc, seq);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001671}
1672
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001674 * drm_handle_vblank - handle a vblank event
1675 * @dev: DRM device
1676 * @crtc: where this event occurred
1677 *
1678 * Drivers should call this routine in their vblank interrupt handlers to
1679 * update the vblank counter and send any signals that may be pending.
Thierry Reding115ebcd2014-12-15 14:47:18 +01001680 *
1681 * This is the legacy version of drm_crtc_handle_vblank().
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001682 */
Chris Wilson78c6e172011-01-31 10:48:04 +00001683bool drm_handle_vblank(struct drm_device *dev, int crtc)
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001684{
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001685 struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001686 u32 vblcount;
1687 s64 diff_ns;
1688 struct timeval tvblank;
1689 unsigned long irqflags;
1690
Daniel Vetteree3c7792015-02-22 15:11:20 +01001691 if (WARN_ON_ONCE(!dev->num_crtcs))
Chris Wilson78c6e172011-01-31 10:48:04 +00001692 return false;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001693
Rob Clarke6ae8682014-08-06 13:16:59 -04001694 if (WARN_ON(crtc >= dev->num_crtcs))
1695 return false;
1696
Ville Syrjälä56cc2792014-08-06 14:49:51 +03001697 spin_lock_irqsave(&dev->event_lock, irqflags);
1698
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001699 /* Need timestamp lock to prevent concurrent execution with
1700 * vblank enable/disable, as this would cause inconsistent
1701 * or corrupted timestamps and vblank counts.
1702 */
Ville Syrjälä56cc2792014-08-06 14:49:51 +03001703 spin_lock(&dev->vblank_time_lock);
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001704
1705 /* Vblank irq handling disabled. Nothing to do. */
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001706 if (!vblank->enabled) {
Ville Syrjälä56cc2792014-08-06 14:49:51 +03001707 spin_unlock(&dev->vblank_time_lock);
1708 spin_unlock_irqrestore(&dev->event_lock, irqflags);
Chris Wilson78c6e172011-01-31 10:48:04 +00001709 return false;
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001710 }
1711
1712 /* Fetch corresponding timestamp for this vblank interval from
1713 * driver and store it in proper slot of timestamp ringbuffer.
1714 */
1715
1716 /* Get current timestamp and count. */
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001717 vblcount = atomic_read(&vblank->count);
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001718 drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ);
1719
1720 /* Compute time difference to timestamp of last vblank */
1721 diff_ns = timeval_to_ns(&tvblank) -
1722 timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
1723
1724 /* Update vblank timestamp and count if at least
1725 * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds
1726 * difference between last stored timestamp and current
1727 * timestamp. A smaller difference means basically
1728 * identical timestamps. Happens if this vblank has
1729 * been already processed and this is a redundant call,
1730 * e.g., due to spurious vblank interrupts. We need to
1731 * ignore those for accounting.
1732 */
Mario Kleinerc4cc3832011-02-21 05:42:00 +01001733 if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) {
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001734 /* Store new timestamp in ringbuffer. */
1735 vblanktimestamp(dev, crtc, vblcount + 1) = tvblank;
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001736
1737 /* Increment cooked vblank count. This also atomically commits
1738 * the timestamp computed above.
1739 */
Peter Zijlstra4e857c52014-03-17 18:06:10 +01001740 smp_mb__before_atomic();
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001741 atomic_inc(&vblank->count);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01001742 smp_mb__after_atomic();
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001743 } else {
1744 DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n",
1745 crtc, (int) diff_ns);
1746 }
1747
Ville Syrjälä56cc2792014-08-06 14:49:51 +03001748 spin_unlock(&dev->vblank_time_lock);
1749
Ville Syrjälä8a51d5b2014-08-06 14:49:50 +03001750 wake_up(&vblank->queue);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001751 drm_handle_vblank_events(dev, crtc);
Mario Kleiner27641c3f2010-10-23 04:20:23 +02001752
Ville Syrjälä56cc2792014-08-06 14:49:51 +03001753 spin_unlock_irqrestore(&dev->event_lock, irqflags);
1754
Chris Wilson78c6e172011-01-31 10:48:04 +00001755 return true;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001756}
1757EXPORT_SYMBOL(drm_handle_vblank);
Thierry Reding115ebcd2014-12-15 14:47:18 +01001758
1759/**
1760 * drm_crtc_handle_vblank - handle a vblank event
1761 * @crtc: where this event occurred
1762 *
1763 * Drivers should call this routine in their vblank interrupt handlers to
1764 * update the vblank counter and send any signals that may be pending.
1765 *
1766 * This is the native KMS version of drm_handle_vblank().
1767 *
1768 * Returns:
1769 * True if the event was successfully handled, false on failure.
1770 */
1771bool drm_crtc_handle_vblank(struct drm_crtc *crtc)
1772{
1773 return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc));
1774}
1775EXPORT_SYMBOL(drm_crtc_handle_vblank);