blob: 2022a5c966bb050d89084a699cc6e6ab8508a026 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/**
Dave Airlieb5e89ed2005-09-25 14:28:13 +10002 * \file drm_irq.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * IRQ support
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9/*
10 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
11 *
12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
22 *
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
34 */
35
36#include "drmP.h"
Jesse Barnesac2874b2010-07-01 16:47:31 -070037#include "drm_trace.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>
Mario Kleiner27641c32010-10-23 04:20:23 +020043
44/* Access macro for slots in vblank timestamp ringbuffer. */
45#define vblanktimestamp(dev, crtc, count) ( \
46 (dev)->_vblank_time[(crtc) * DRM_VBLANKTIME_RBSIZE + \
47 ((count) % DRM_VBLANKTIME_RBSIZE)])
48
49/* Retry timestamp calculation up to 3 times to satisfy
50 * drm_timestamp_precision before giving up.
51 */
52#define DRM_TIMESTAMP_MAXRETRIES 3
53
54/* Threshold in nanoseconds for detection of redundant
55 * vblank irq in drm_handle_vblank(). 1 msec should be ok.
56 */
57#define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
58
Linus Torvalds1da177e2005-04-16 15:20:36 -070059/**
60 * Get interrupt from bus id.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100061 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +100063 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 * \param cmd command.
65 * \param arg user argument, pointing to a drm_irq_busid structure.
66 * \return zero on success or a negative number on failure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100067 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 * Finds the PCI device with the specified bus id and gets its IRQ number.
69 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
70 * to that of the device that this DRM instance attached to.
71 */
Eric Anholtc153f452007-09-03 12:06:45 +100072int drm_irq_by_busid(struct drm_device *dev, void *data,
73 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074{
Eric Anholtc153f452007-09-03 12:06:45 +100075 struct drm_irq_busid *p = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Dave Airlie8410ea32010-12-15 03:16:38 +100077 if (!dev->driver->bus->irq_by_busid)
Jordan Crousedcdb1672010-05-27 13:40:25 -060078 return -EINVAL;
79
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
81 return -EINVAL;
82
Dave Airlie8410ea32010-12-15 03:16:38 +100083 return dev->driver->bus->irq_by_busid(dev, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084}
85
Mario Kleiner27641c32010-10-23 04:20:23 +020086/*
87 * Clear vblank timestamp buffer for a crtc.
88 */
89static void clear_vblank_timestamps(struct drm_device *dev, int crtc)
90{
91 memset(&dev->_vblank_time[crtc * DRM_VBLANKTIME_RBSIZE], 0,
92 DRM_VBLANKTIME_RBSIZE * sizeof(struct timeval));
93}
94
95/*
96 * Disable vblank irq's on crtc, make sure that last vblank count
97 * of hardware and corresponding consistent software vblank counter
98 * are preserved, even if there are any spurious vblank irq's after
99 * disable.
100 */
101static void vblank_disable_and_save(struct drm_device *dev, int crtc)
102{
103 unsigned long irqflags;
104 u32 vblcount;
105 s64 diff_ns;
106 int vblrc;
107 struct timeval tvblank;
108
109 /* Prevent vblank irq processing while disabling vblank irqs,
110 * so no updates of timestamps or count can happen after we've
111 * disabled. Needed to prevent races in case of delayed irq's.
112 * Disable preemption, so vblank_time_lock is held as short as
113 * possible, even under a kernel with PREEMPT_RT patches.
114 */
115 preempt_disable();
116 spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
117
118 dev->driver->disable_vblank(dev, crtc);
119 dev->vblank_enabled[crtc] = 0;
120
121 /* No further vblank irq's will be processed after
122 * this point. Get current hardware vblank count and
123 * vblank timestamp, repeat until they are consistent.
124 *
125 * FIXME: There is still a race condition here and in
126 * drm_update_vblank_count() which can cause off-by-one
127 * reinitialization of software vblank counter. If gpu
128 * vblank counter doesn't increment exactly at the leading
129 * edge of a vblank interval, then we can lose 1 count if
130 * we happen to execute between start of vblank and the
131 * delayed gpu counter increment.
132 */
133 do {
134 dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc);
135 vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0);
136 } while (dev->last_vblank[crtc] != dev->driver->get_vblank_counter(dev, crtc));
137
138 /* Compute time difference to stored timestamp of last vblank
139 * as updated by last invocation of drm_handle_vblank() in vblank irq.
140 */
141 vblcount = atomic_read(&dev->_vblank_count[crtc]);
142 diff_ns = timeval_to_ns(&tvblank) -
143 timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
144
145 /* If there is at least 1 msec difference between the last stored
146 * timestamp and tvblank, then we are currently executing our
147 * disable inside a new vblank interval, the tvblank timestamp
148 * corresponds to this new vblank interval and the irq handler
149 * for this vblank didn't run yet and won't run due to our disable.
150 * Therefore we need to do the job of drm_handle_vblank() and
151 * increment the vblank counter by one to account for this vblank.
152 *
153 * Skip this step if there isn't any high precision timestamp
154 * available. In that case we can't account for this and just
155 * hope for the best.
156 */
Mario Kleinerbc215122011-02-21 05:42:01 +0100157 if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) {
Mario Kleiner27641c32010-10-23 04:20:23 +0200158 atomic_inc(&dev->_vblank_count[crtc]);
Mario Kleinerbc215122011-02-21 05:42:01 +0100159 smp_mb__after_atomic_inc();
160 }
Mario Kleiner27641c32010-10-23 04:20:23 +0200161
162 /* Invalidate all timestamps while vblank irq's are off. */
163 clear_vblank_timestamps(dev, crtc);
164
165 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
166 preempt_enable();
167}
168
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700169static void vblank_disable_fn(unsigned long arg)
170{
171 struct drm_device *dev = (struct drm_device *)arg;
172 unsigned long irqflags;
173 int i;
174
175 if (!dev->vblank_disable_allowed)
176 return;
177
178 for (i = 0; i < dev->num_crtcs; i++) {
179 spin_lock_irqsave(&dev->vbl_lock, irqflags);
180 if (atomic_read(&dev->vblank_refcount[i]) == 0 &&
181 dev->vblank_enabled[i]) {
182 DRM_DEBUG("disabling vblank on crtc %d\n", i);
Mario Kleiner27641c32010-10-23 04:20:23 +0200183 vblank_disable_and_save(dev, i);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700184 }
185 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
186 }
187}
188
Keith Packard52440212008-11-18 09:30:25 -0800189void drm_vblank_cleanup(struct drm_device *dev)
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700190{
191 /* Bail if the driver didn't call drm_vblank_init() */
192 if (dev->num_crtcs == 0)
193 return;
194
195 del_timer(&dev->vblank_disable_timer);
196
197 vblank_disable_fn((unsigned long)dev);
198
Eric Anholt9a298b22009-03-24 12:23:04 -0700199 kfree(dev->vbl_queue);
200 kfree(dev->_vblank_count);
201 kfree(dev->vblank_refcount);
202 kfree(dev->vblank_enabled);
203 kfree(dev->last_vblank);
204 kfree(dev->last_vblank_wait);
205 kfree(dev->vblank_inmodeset);
Mario Kleiner27641c32010-10-23 04:20:23 +0200206 kfree(dev->_vblank_time);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700207
208 dev->num_crtcs = 0;
209}
Jerome Glissee77cef92010-01-07 15:39:13 +0100210EXPORT_SYMBOL(drm_vblank_cleanup);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700211
212int drm_vblank_init(struct drm_device *dev, int num_crtcs)
213{
214 int i, ret = -ENOMEM;
215
216 setup_timer(&dev->vblank_disable_timer, vblank_disable_fn,
217 (unsigned long)dev);
218 spin_lock_init(&dev->vbl_lock);
Mario Kleiner27641c32010-10-23 04:20:23 +0200219 spin_lock_init(&dev->vblank_time_lock);
220
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700221 dev->num_crtcs = num_crtcs;
222
Eric Anholt9a298b22009-03-24 12:23:04 -0700223 dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs,
224 GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700225 if (!dev->vbl_queue)
226 goto err;
227
Eric Anholt9a298b22009-03-24 12:23:04 -0700228 dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700229 if (!dev->_vblank_count)
230 goto err;
231
Eric Anholt9a298b22009-03-24 12:23:04 -0700232 dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs,
233 GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700234 if (!dev->vblank_refcount)
235 goto err;
236
Eric Anholt9a298b22009-03-24 12:23:04 -0700237 dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700238 if (!dev->vblank_enabled)
239 goto err;
240
Eric Anholt9a298b22009-03-24 12:23:04 -0700241 dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700242 if (!dev->last_vblank)
243 goto err;
244
Eric Anholt9a298b22009-03-24 12:23:04 -0700245 dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
Eric Anholtfede5c92008-12-19 17:23:38 -0800246 if (!dev->last_vblank_wait)
247 goto err;
248
Eric Anholt9a298b22009-03-24 12:23:04 -0700249 dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700250 if (!dev->vblank_inmodeset)
251 goto err;
252
Mario Kleiner27641c32010-10-23 04:20:23 +0200253 dev->_vblank_time = kcalloc(num_crtcs * DRM_VBLANKTIME_RBSIZE,
254 sizeof(struct timeval), GFP_KERNEL);
255 if (!dev->_vblank_time)
256 goto err;
257
258 DRM_INFO("Supports vblank timestamp caching Rev 1 (10.10.2010).\n");
259
260 /* Driver specific high-precision vblank timestamping supported? */
261 if (dev->driver->get_vblank_timestamp)
262 DRM_INFO("Driver supports precise vblank timestamp query.\n");
263 else
264 DRM_INFO("No driver support for vblank timestamp query.\n");
265
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700266 /* Zero per-crtc vblank stuff */
267 for (i = 0; i < num_crtcs; i++) {
268 init_waitqueue_head(&dev->vbl_queue[i]);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700269 atomic_set(&dev->_vblank_count[i], 0);
270 atomic_set(&dev->vblank_refcount[i], 0);
271 }
272
273 dev->vblank_disable_allowed = 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700274 return 0;
275
276err:
277 drm_vblank_cleanup(dev);
278 return ret;
279}
280EXPORT_SYMBOL(drm_vblank_init);
281
Dave Airlie28d52042009-09-21 14:33:58 +1000282static void drm_irq_vgaarb_nokms(void *cookie, bool state)
283{
284 struct drm_device *dev = cookie;
285
286 if (dev->driver->vgaarb_irq) {
287 dev->driver->vgaarb_irq(dev, state);
288 return;
289 }
290
291 if (!dev->irq_enabled)
292 return;
293
294 if (state)
295 dev->driver->irq_uninstall(dev);
296 else {
297 dev->driver->irq_preinstall(dev);
298 dev->driver->irq_postinstall(dev);
299 }
300}
301
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302/**
303 * Install IRQ handler.
304 *
305 * \param dev DRM device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 *
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700307 * Initializes the IRQ related data. Installs the handler, calling the driver
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
309 * before and after the installation.
310 */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700311int drm_irq_install(struct drm_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312{
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700313 int ret = 0;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000314 unsigned long sh_flags = 0;
Dave Airlieb8da7de2009-06-02 16:50:35 +1000315 char *irqname;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
317 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
318 return -EINVAL;
319
Jordan Crousedcdb1672010-05-27 13:40:25 -0600320 if (drm_dev_to_irq(dev) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 return -EINVAL;
322
Dave Airlie30e2fb12006-02-02 19:37:46 +1100323 mutex_lock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
325 /* Driver must have been initialized */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000326 if (!dev->dev_private) {
Dave Airlie30e2fb12006-02-02 19:37:46 +1100327 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 return -EINVAL;
329 }
330
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000331 if (dev->irq_enabled) {
Dave Airlie30e2fb12006-02-02 19:37:46 +1100332 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 return -EBUSY;
334 }
335 dev->irq_enabled = 1;
Dave Airlie30e2fb12006-02-02 19:37:46 +1100336 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
Jordan Crousedcdb1672010-05-27 13:40:25 -0600338 DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000340 /* Before installing handler */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 dev->driver->irq_preinstall(dev);
342
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000343 /* Install handler */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
Thomas Gleixner935f6e32006-07-01 19:29:34 -0700345 sh_flags = IRQF_SHARED;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000346
Dave Airlieb8da7de2009-06-02 16:50:35 +1000347 if (dev->devname)
348 irqname = dev->devname;
349 else
350 irqname = dev->driver->name;
351
Jesse Barnes9bfbd5c2008-09-15 15:00:33 -0700352 ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler,
Dave Airlieb8da7de2009-06-02 16:50:35 +1000353 sh_flags, irqname, dev);
Jesse Barnes9bfbd5c2008-09-15 15:00:33 -0700354
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000355 if (ret < 0) {
Dave Airlie30e2fb12006-02-02 19:37:46 +1100356 mutex_lock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 dev->irq_enabled = 0;
Dave Airlie30e2fb12006-02-02 19:37:46 +1100358 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 return ret;
360 }
361
Dave Airlie28d52042009-09-21 14:33:58 +1000362 if (!drm_core_check_feature(dev, DRIVER_MODESET))
363 vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL);
364
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000365 /* After installing handler */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700366 ret = dev->driver->irq_postinstall(dev);
367 if (ret < 0) {
368 mutex_lock(&dev->struct_mutex);
369 dev->irq_enabled = 0;
370 mutex_unlock(&dev->struct_mutex);
371 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700373 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374}
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700375EXPORT_SYMBOL(drm_irq_install);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
377/**
378 * Uninstall the IRQ handler.
379 *
380 * \param dev DRM device.
381 *
382 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
383 */
Mario Kleiner27641c32010-10-23 04:20:23 +0200384int drm_irq_uninstall(struct drm_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385{
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800386 unsigned long irqflags;
387 int irq_enabled, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
389 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
390 return -EINVAL;
391
Dave Airlie30e2fb12006-02-02 19:37:46 +1100392 mutex_lock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 irq_enabled = dev->irq_enabled;
394 dev->irq_enabled = 0;
Dave Airlie30e2fb12006-02-02 19:37:46 +1100395 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800397 /*
398 * Wake up any waiters so they don't hang.
399 */
400 spin_lock_irqsave(&dev->vbl_lock, irqflags);
401 for (i = 0; i < dev->num_crtcs; i++) {
402 DRM_WAKEUP(&dev->vbl_queue[i]);
403 dev->vblank_enabled[i] = 0;
Jesse Barnes14d200c2009-02-06 13:04:49 -0800404 dev->last_vblank[i] = dev->driver->get_vblank_counter(dev, i);
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800405 }
406 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
407
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000408 if (!irq_enabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 return -EINVAL;
410
Jordan Crousedcdb1672010-05-27 13:40:25 -0600411 DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
Dave Airlie28d52042009-09-21 14:33:58 +1000413 if (!drm_core_check_feature(dev, DRIVER_MODESET))
414 vga_client_register(dev->pdev, NULL, NULL, NULL);
415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 dev->driver->irq_uninstall(dev);
417
Jordan Crousedcdb1672010-05-27 13:40:25 -0600418 free_irq(drm_dev_to_irq(dev), dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
420 return 0;
421}
422EXPORT_SYMBOL(drm_irq_uninstall);
423
424/**
425 * IRQ control ioctl.
426 *
427 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +1000428 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 * \param cmd command.
430 * \param arg user argument, pointing to a drm_control structure.
431 * \return zero on success or a negative number on failure.
432 *
433 * Calls irq_install() or irq_uninstall() according to \p arg.
434 */
Eric Anholtc153f452007-09-03 12:06:45 +1000435int drm_control(struct drm_device *dev, void *data,
436 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437{
Eric Anholtc153f452007-09-03 12:06:45 +1000438 struct drm_control *ctl = data;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000439
Mario Kleiner27641c32010-10-23 04:20:23 +0200440 /* if we haven't irq we fallback for compatibility reasons -
441 * this used to be a separate function in drm_dma.h
442 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Eric Anholtc153f452007-09-03 12:06:45 +1000445 switch (ctl->func) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 case DRM_INST_HANDLER:
447 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
448 return 0;
Dave Airlief453ba02008-11-07 14:05:41 -0800449 if (drm_core_check_feature(dev, DRIVER_MODESET))
450 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
Jordan Crousedcdb1672010-05-27 13:40:25 -0600452 ctl->irq != drm_dev_to_irq(dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 return -EINVAL;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000454 return drm_irq_install(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 case DRM_UNINST_HANDLER:
456 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
457 return 0;
Dave Airlief453ba02008-11-07 14:05:41 -0800458 if (drm_core_check_feature(dev, DRIVER_MODESET))
459 return 0;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000460 return drm_irq_uninstall(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 default:
462 return -EINVAL;
463 }
464}
465
466/**
Mario Kleiner27641c32010-10-23 04:20:23 +0200467 * drm_calc_timestamping_constants - Calculate and
468 * store various constants which are later needed by
469 * vblank and swap-completion timestamping, e.g, by
470 * drm_calc_vbltimestamp_from_scanoutpos().
471 * They are derived from crtc's true scanout timing,
472 * so they take things like panel scaling or other
473 * adjustments into account.
474 *
475 * @crtc drm_crtc whose timestamp constants should be updated.
476 *
477 */
478void drm_calc_timestamping_constants(struct drm_crtc *crtc)
479{
480 s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0;
481 u64 dotclock;
482
483 /* Dot clock in Hz: */
484 dotclock = (u64) crtc->hwmode.clock * 1000;
485
Mario Kleiner9be6f8a2011-02-21 05:42:02 +0100486 /* Fields of interlaced scanout modes are only halve a frame duration.
487 * Double the dotclock to get halve the frame-/line-/pixelduration.
488 */
489 if (crtc->hwmode.flags & DRM_MODE_FLAG_INTERLACE)
490 dotclock *= 2;
491
Mario Kleiner27641c32010-10-23 04:20:23 +0200492 /* Valid dotclock? */
493 if (dotclock > 0) {
494 /* Convert scanline length in pixels and video dot clock to
495 * line duration, frame duration and pixel duration in
496 * nanoseconds:
497 */
498 pixeldur_ns = (s64) div64_u64(1000000000, dotclock);
499 linedur_ns = (s64) div64_u64(((u64) crtc->hwmode.crtc_htotal *
500 1000000000), dotclock);
501 framedur_ns = (s64) crtc->hwmode.crtc_vtotal * linedur_ns;
502 } else
503 DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n",
504 crtc->base.id);
505
506 crtc->pixeldur_ns = pixeldur_ns;
507 crtc->linedur_ns = linedur_ns;
508 crtc->framedur_ns = framedur_ns;
509
510 DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n",
511 crtc->base.id, crtc->hwmode.crtc_htotal,
512 crtc->hwmode.crtc_vtotal, crtc->hwmode.crtc_vdisplay);
513 DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n",
514 crtc->base.id, (int) dotclock/1000, (int) framedur_ns,
515 (int) linedur_ns, (int) pixeldur_ns);
516}
517EXPORT_SYMBOL(drm_calc_timestamping_constants);
518
519/**
520 * drm_calc_vbltimestamp_from_scanoutpos - helper routine for kms
521 * drivers. Implements calculation of exact vblank timestamps from
522 * given drm_display_mode timings and current video scanout position
523 * of a crtc. This can be called from within get_vblank_timestamp()
524 * implementation of a kms driver to implement the actual timestamping.
525 *
526 * Should return timestamps conforming to the OML_sync_control OpenML
527 * extension specification. The timestamp corresponds to the end of
528 * the vblank interval, aka start of scanout of topmost-leftmost display
529 * pixel in the following video frame.
530 *
531 * Requires support for optional dev->driver->get_scanout_position()
532 * in kms driver, plus a bit of setup code to provide a drm_display_mode
533 * that corresponds to the true scanout timing.
534 *
535 * The current implementation only handles standard video modes. It
536 * returns as no operation if a doublescan or interlaced video mode is
537 * active. Higher level code is expected to handle this.
538 *
539 * @dev: DRM device.
540 * @crtc: Which crtc's vblank timestamp to retrieve.
541 * @max_error: Desired maximum allowable error in timestamps (nanosecs).
542 * On return contains true maximum error of timestamp.
543 * @vblank_time: Pointer to struct timeval which should receive the timestamp.
544 * @flags: Flags to pass to driver:
545 * 0 = Default.
546 * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler.
547 * @refcrtc: drm_crtc* of crtc which defines scanout timing.
548 *
549 * Returns negative value on error, failure or if not supported in current
550 * video mode:
551 *
552 * -EINVAL - Invalid crtc.
553 * -EAGAIN - Temporary unavailable, e.g., called before initial modeset.
554 * -ENOTSUPP - Function not supported in current display mode.
555 * -EIO - Failed, e.g., due to failed scanout position query.
556 *
557 * Returns or'ed positive status flags on success:
558 *
559 * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.
560 * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.
561 *
562 */
563int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
564 int *max_error,
565 struct timeval *vblank_time,
566 unsigned flags,
567 struct drm_crtc *refcrtc)
568{
569 struct timeval stime, raw_time;
570 struct drm_display_mode *mode;
571 int vbl_status, vtotal, vdisplay;
572 int vpos, hpos, i;
573 s64 framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns;
574 bool invbl;
575
576 if (crtc < 0 || crtc >= dev->num_crtcs) {
577 DRM_ERROR("Invalid crtc %d\n", crtc);
578 return -EINVAL;
579 }
580
581 /* Scanout position query not supported? Should not happen. */
582 if (!dev->driver->get_scanout_position) {
583 DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
584 return -EIO;
585 }
586
587 mode = &refcrtc->hwmode;
588 vtotal = mode->crtc_vtotal;
589 vdisplay = mode->crtc_vdisplay;
590
591 /* Durations of frames, lines, pixels in nanoseconds. */
592 framedur_ns = refcrtc->framedur_ns;
593 linedur_ns = refcrtc->linedur_ns;
594 pixeldur_ns = refcrtc->pixeldur_ns;
595
596 /* If mode timing undefined, just return as no-op:
597 * Happens during initial modesetting of a crtc.
598 */
599 if (vtotal <= 0 || vdisplay <= 0 || framedur_ns == 0) {
600 DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc);
601 return -EAGAIN;
602 }
603
Mario Kleiner27641c32010-10-23 04:20:23 +0200604 /* Get current scanout position with system timestamp.
605 * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times
606 * if single query takes longer than max_error nanoseconds.
607 *
608 * This guarantees a tight bound on maximum error if
609 * code gets preempted or delayed for some reason.
610 */
611 for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) {
612 /* Disable preemption to make it very likely to
613 * succeed in the first iteration even on PREEMPT_RT kernel.
614 */
615 preempt_disable();
616
617 /* Get system timestamp before query. */
618 do_gettimeofday(&stime);
619
620 /* Get vertical and horizontal scanout pos. vpos, hpos. */
621 vbl_status = dev->driver->get_scanout_position(dev, crtc, &vpos, &hpos);
622
623 /* Get system timestamp after query. */
624 do_gettimeofday(&raw_time);
625
626 preempt_enable();
627
628 /* Return as no-op if scanout query unsupported or failed. */
629 if (!(vbl_status & DRM_SCANOUTPOS_VALID)) {
630 DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n",
631 crtc, vbl_status);
632 return -EIO;
633 }
634
635 duration_ns = timeval_to_ns(&raw_time) - timeval_to_ns(&stime);
636
637 /* Accept result with < max_error nsecs timing uncertainty. */
638 if (duration_ns <= (s64) *max_error)
639 break;
640 }
641
642 /* Noisy system timing? */
643 if (i == DRM_TIMESTAMP_MAXRETRIES) {
644 DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n",
645 crtc, (int) duration_ns/1000, *max_error/1000, i);
646 }
647
648 /* Return upper bound of timestamp precision error. */
649 *max_error = (int) duration_ns;
650
651 /* Check if in vblank area:
652 * vpos is >=0 in video scanout area, but negative
653 * within vblank area, counting down the number of lines until
654 * start of scanout.
655 */
656 invbl = vbl_status & DRM_SCANOUTPOS_INVBL;
657
658 /* Convert scanout position into elapsed time at raw_time query
659 * since start of scanout at first display scanline. delta_ns
660 * can be negative if start of scanout hasn't happened yet.
661 */
662 delta_ns = (s64) vpos * linedur_ns + (s64) hpos * pixeldur_ns;
663
664 /* Is vpos outside nominal vblank area, but less than
665 * 1/100 of a frame height away from start of vblank?
666 * If so, assume this isn't a massively delayed vblank
667 * interrupt, but a vblank interrupt that fired a few
668 * microseconds before true start of vblank. Compensate
669 * by adding a full frame duration to the final timestamp.
670 * Happens, e.g., on ATI R500, R600.
671 *
672 * We only do this if DRM_CALLED_FROM_VBLIRQ.
673 */
674 if ((flags & DRM_CALLED_FROM_VBLIRQ) && !invbl &&
675 ((vdisplay - vpos) < vtotal / 100)) {
676 delta_ns = delta_ns - framedur_ns;
677
678 /* Signal this correction as "applied". */
679 vbl_status |= 0x8;
680 }
681
682 /* Subtract time delta from raw timestamp to get final
683 * vblank_time timestamp for end of vblank.
684 */
685 *vblank_time = ns_to_timeval(timeval_to_ns(&raw_time) - delta_ns);
686
Joe Perchesbbb0aef2011-04-17 20:35:52 -0700687 DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",
688 crtc, (int)vbl_status, hpos, vpos,
689 (long)raw_time.tv_sec, (long)raw_time.tv_usec,
690 (long)vblank_time->tv_sec, (long)vblank_time->tv_usec,
691 (int)duration_ns/1000, i);
Mario Kleiner27641c32010-10-23 04:20:23 +0200692
693 vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD;
694 if (invbl)
695 vbl_status |= DRM_VBLANKTIME_INVBL;
696
697 return vbl_status;
698}
699EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
700
701/**
702 * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent
703 * vblank interval.
704 *
705 * @dev: DRM device
706 * @crtc: which crtc's vblank timestamp to retrieve
707 * @tvblank: Pointer to target struct timeval which should receive the timestamp
708 * @flags: Flags to pass to driver:
709 * 0 = Default.
710 * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler.
711 *
712 * Fetches the system timestamp corresponding to the time of the most recent
713 * vblank interval on specified crtc. May call into kms-driver to
714 * compute the timestamp with a high-precision GPU specific method.
715 *
716 * Returns zero if timestamp originates from uncorrected do_gettimeofday()
717 * call, i.e., it isn't very precisely locked to the true vblank.
718 *
719 * Returns non-zero if timestamp is considered to be very precise.
720 */
721u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
722 struct timeval *tvblank, unsigned flags)
723{
724 int ret = 0;
725
726 /* Define requested maximum error on timestamps (nanoseconds). */
727 int max_error = (int) drm_timestamp_precision * 1000;
728
729 /* Query driver if possible and precision timestamping enabled. */
730 if (dev->driver->get_vblank_timestamp && (max_error > 0)) {
731 ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error,
732 tvblank, flags);
733 if (ret > 0)
734 return (u32) ret;
735 }
736
737 /* GPU high precision timestamp query unsupported or failed.
738 * Return gettimeofday timestamp as best estimate.
739 */
740 do_gettimeofday(tvblank);
741
742 return 0;
743}
744EXPORT_SYMBOL(drm_get_last_vbltimestamp);
745
746/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700747 * drm_vblank_count - retrieve "cooked" vblank counter value
748 * @dev: DRM device
749 * @crtc: which counter to retrieve
750 *
751 * Fetches the "cooked" vblank count value that represents the number of
752 * vblank events since the system was booted, including lost events due to
753 * modesetting activity.
754 */
755u32 drm_vblank_count(struct drm_device *dev, int crtc)
756{
757 return atomic_read(&dev->_vblank_count[crtc]);
758}
759EXPORT_SYMBOL(drm_vblank_count);
760
761/**
Mario Kleiner27641c32010-10-23 04:20:23 +0200762 * drm_vblank_count_and_time - retrieve "cooked" vblank counter value
763 * and the system timestamp corresponding to that vblank counter value.
764 *
765 * @dev: DRM device
766 * @crtc: which counter to retrieve
767 * @vblanktime: Pointer to struct timeval to receive the vblank timestamp.
768 *
769 * Fetches the "cooked" vblank count value that represents the number of
770 * vblank events since the system was booted, including lost events due to
771 * modesetting activity. Returns corresponding system timestamp of the time
772 * of the vblank interval that corresponds to the current value vblank counter
773 * value.
774 */
775u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc,
776 struct timeval *vblanktime)
777{
778 u32 cur_vblank;
779
780 /* Read timestamp from slot of _vblank_time ringbuffer
781 * that corresponds to current vblank count. Retry if
782 * count has incremented during readout. This works like
783 * a seqlock.
784 */
785 do {
786 cur_vblank = atomic_read(&dev->_vblank_count[crtc]);
787 *vblanktime = vblanktimestamp(dev, crtc, cur_vblank);
788 smp_rmb();
789 } while (cur_vblank != atomic_read(&dev->_vblank_count[crtc]));
790
791 return cur_vblank;
792}
793EXPORT_SYMBOL(drm_vblank_count_and_time);
794
795/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700796 * drm_update_vblank_count - update the master vblank counter
797 * @dev: DRM device
798 * @crtc: counter to update
799 *
800 * Call back into the driver to update the appropriate vblank counter
801 * (specified by @crtc). Deal with wraparound, if it occurred, and
802 * update the last read value so we can deal with wraparound on the next
803 * call if necessary.
804 *
805 * Only necessary when going from off->on, to account for frames we
806 * didn't get an interrupt for.
807 *
808 * Note: caller must hold dev->vbl_lock since this reads & writes
809 * device vblank fields.
810 */
811static void drm_update_vblank_count(struct drm_device *dev, int crtc)
812{
Mario Kleiner27641c32010-10-23 04:20:23 +0200813 u32 cur_vblank, diff, tslot, rc;
814 struct timeval t_vblank;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700815
816 /*
817 * Interrupts were disabled prior to this call, so deal with counter
818 * wrap if needed.
819 * NOTE! It's possible we lost a full dev->max_vblank_count events
820 * here if the register is small or we had vblank interrupts off for
821 * a long time.
Mario Kleiner27641c32010-10-23 04:20:23 +0200822 *
823 * We repeat the hardware vblank counter & timestamp query until
824 * we get consistent results. This to prevent races between gpu
825 * updating its hardware counter while we are retrieving the
826 * corresponding vblank timestamp.
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700827 */
Mario Kleiner27641c32010-10-23 04:20:23 +0200828 do {
829 cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
830 rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0);
831 } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc));
832
833 /* Deal with counter wrap */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700834 diff = cur_vblank - dev->last_vblank[crtc];
835 if (cur_vblank < dev->last_vblank[crtc]) {
836 diff += dev->max_vblank_count;
837
838 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
839 crtc, dev->last_vblank[crtc], cur_vblank, diff);
840 }
841
842 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
843 crtc, diff);
844
Mario Kleiner27641c32010-10-23 04:20:23 +0200845 /* Reinitialize corresponding vblank timestamp if high-precision query
846 * available. Skip this step if query unsupported or failed. Will
847 * reinitialize delayed at next vblank interrupt in that case.
848 */
849 if (rc) {
850 tslot = atomic_read(&dev->_vblank_count[crtc]) + diff;
851 vblanktimestamp(dev, crtc, tslot) = t_vblank;
Mario Kleiner27641c32010-10-23 04:20:23 +0200852 }
853
Mario Kleinerbc215122011-02-21 05:42:01 +0100854 smp_mb__before_atomic_inc();
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700855 atomic_add(diff, &dev->_vblank_count[crtc]);
Mario Kleinerbc215122011-02-21 05:42:01 +0100856 smp_mb__after_atomic_inc();
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700857}
858
859/**
860 * drm_vblank_get - get a reference count on vblank events
861 * @dev: DRM device
862 * @crtc: which CRTC to own
863 *
864 * Acquire a reference count on vblank events to avoid having them disabled
865 * while in use.
866 *
867 * RETURNS
868 * Zero on success, nonzero on failure.
869 */
870int drm_vblank_get(struct drm_device *dev, int crtc)
871{
Mario Kleiner27641c32010-10-23 04:20:23 +0200872 unsigned long irqflags, irqflags2;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700873 int ret = 0;
874
875 spin_lock_irqsave(&dev->vbl_lock, irqflags);
876 /* Going from 0->1 means we have to enable interrupts again */
Li Peng778c9022009-11-09 12:51:22 +0800877 if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) {
Mario Kleiner27641c32010-10-23 04:20:23 +0200878 /* Disable preemption while holding vblank_time_lock. Do
879 * it explicitely to guard against PREEMPT_RT kernel.
880 */
881 preempt_disable();
882 spin_lock_irqsave(&dev->vblank_time_lock, irqflags2);
Li Peng778c9022009-11-09 12:51:22 +0800883 if (!dev->vblank_enabled[crtc]) {
Mario Kleiner27641c32010-10-23 04:20:23 +0200884 /* Enable vblank irqs under vblank_time_lock protection.
885 * All vblank count & timestamp updates are held off
886 * until we are done reinitializing master counter and
887 * timestamps. Filtercode in drm_handle_vblank() will
888 * prevent double-accounting of same vblank interval.
889 */
Li Peng778c9022009-11-09 12:51:22 +0800890 ret = dev->driver->enable_vblank(dev, crtc);
Mario Kleiner27641c32010-10-23 04:20:23 +0200891 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n",
892 crtc, ret);
Li Peng778c9022009-11-09 12:51:22 +0800893 if (ret)
894 atomic_dec(&dev->vblank_refcount[crtc]);
895 else {
896 dev->vblank_enabled[crtc] = 1;
897 drm_update_vblank_count(dev, crtc);
898 }
899 }
Mario Kleiner27641c32010-10-23 04:20:23 +0200900 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2);
901 preempt_enable();
Li Peng778c9022009-11-09 12:51:22 +0800902 } else {
903 if (!dev->vblank_enabled[crtc]) {
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700904 atomic_dec(&dev->vblank_refcount[crtc]);
Li Peng778c9022009-11-09 12:51:22 +0800905 ret = -EINVAL;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700906 }
907 }
908 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
909
910 return ret;
911}
912EXPORT_SYMBOL(drm_vblank_get);
913
914/**
915 * drm_vblank_put - give up ownership of vblank events
916 * @dev: DRM device
917 * @crtc: which counter to give up
918 *
919 * Release ownership of a given vblank counter, turning off interrupts
Mario Kleiner27641c32010-10-23 04:20:23 +0200920 * if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700921 */
922void drm_vblank_put(struct drm_device *dev, int crtc)
923{
Mario Kleiner27641c32010-10-23 04:20:23 +0200924 BUG_ON(atomic_read(&dev->vblank_refcount[crtc]) == 0);
Chris Wilsonb3f5e732009-02-19 14:48:22 +0000925
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700926 /* Last user schedules interrupt disable */
Mario Kleiner27641c32010-10-23 04:20:23 +0200927 if (atomic_dec_and_test(&dev->vblank_refcount[crtc]) &&
928 (drm_vblank_offdelay > 0))
929 mod_timer(&dev->vblank_disable_timer,
930 jiffies + ((drm_vblank_offdelay * DRM_HZ)/1000));
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700931}
932EXPORT_SYMBOL(drm_vblank_put);
933
Li Peng778c9022009-11-09 12:51:22 +0800934void drm_vblank_off(struct drm_device *dev, int crtc)
935{
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +1000936 struct drm_pending_vblank_event *e, *t;
937 struct timeval now;
Li Peng778c9022009-11-09 12:51:22 +0800938 unsigned long irqflags;
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +1000939 unsigned int seq;
Li Peng778c9022009-11-09 12:51:22 +0800940
941 spin_lock_irqsave(&dev->vbl_lock, irqflags);
Mario Kleiner27641c32010-10-23 04:20:23 +0200942 vblank_disable_and_save(dev, crtc);
Li Peng778c9022009-11-09 12:51:22 +0800943 DRM_WAKEUP(&dev->vbl_queue[crtc]);
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +1000944
945 /* Send any queued vblank events, lest the natives grow disquiet */
946 seq = drm_vblank_count_and_time(dev, crtc, &now);
947 list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
948 if (e->pipe != crtc)
949 continue;
950 DRM_DEBUG("Sending premature vblank event on disable: \
951 wanted %d, current %d\n",
952 e->event.sequence, seq);
953
954 e->event.sequence = seq;
955 e->event.tv_sec = now.tv_sec;
956 e->event.tv_usec = now.tv_usec;
957 drm_vblank_put(dev, e->pipe);
958 list_move_tail(&e->base.link, &e->base.file_priv->event_list);
959 wake_up_interruptible(&e->base.file_priv->event_wait);
960 trace_drm_vblank_event_delivered(e->base.pid, e->pipe,
961 e->event.sequence);
962 }
963
Li Peng778c9022009-11-09 12:51:22 +0800964 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
965}
966EXPORT_SYMBOL(drm_vblank_off);
967
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700968/**
Dave Airlief453ba02008-11-07 14:05:41 -0800969 * drm_vblank_pre_modeset - account for vblanks across mode sets
970 * @dev: DRM device
971 * @crtc: CRTC in question
972 * @post: post or pre mode set?
973 *
974 * Account for vblank events across mode setting events, which will likely
975 * reset the hardware frame counter.
976 */
977void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
978{
Jerome Glissee77cef92010-01-07 15:39:13 +0100979 /* vblank is not initialized (IRQ not installed ?) */
980 if (!dev->num_crtcs)
981 return;
Dave Airlief453ba02008-11-07 14:05:41 -0800982 /*
983 * To avoid all the problems that might happen if interrupts
984 * were enabled/disabled around or between these calls, we just
985 * have the kernel take a reference on the CRTC (just once though
986 * to avoid corrupting the count if multiple, mismatch calls occur),
987 * so that interrupts remain enabled in the interim.
988 */
989 if (!dev->vblank_inmodeset[crtc]) {
Chris Wilsonb3f5e732009-02-19 14:48:22 +0000990 dev->vblank_inmodeset[crtc] = 0x1;
991 if (drm_vblank_get(dev, crtc) == 0)
992 dev->vblank_inmodeset[crtc] |= 0x2;
Dave Airlief453ba02008-11-07 14:05:41 -0800993 }
994}
995EXPORT_SYMBOL(drm_vblank_pre_modeset);
996
997void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
998{
999 unsigned long irqflags;
1000
1001 if (dev->vblank_inmodeset[crtc]) {
1002 spin_lock_irqsave(&dev->vbl_lock, irqflags);
1003 dev->vblank_disable_allowed = 1;
Dave Airlief453ba02008-11-07 14:05:41 -08001004 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
Chris Wilsonb3f5e732009-02-19 14:48:22 +00001005
1006 if (dev->vblank_inmodeset[crtc] & 0x2)
1007 drm_vblank_put(dev, crtc);
1008
1009 dev->vblank_inmodeset[crtc] = 0;
Dave Airlief453ba02008-11-07 14:05:41 -08001010 }
1011}
1012EXPORT_SYMBOL(drm_vblank_post_modeset);
1013
1014/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001015 * drm_modeset_ctl - handle vblank event counter changes across mode switch
1016 * @DRM_IOCTL_ARGS: standard ioctl arguments
1017 *
1018 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
1019 * ioctls around modesetting so that any lost vblank events are accounted for.
1020 *
1021 * Generally the counter will reset across mode sets. If interrupts are
1022 * enabled around this call, we don't have to do anything since the counter
1023 * will have already been incremented.
1024 */
1025int drm_modeset_ctl(struct drm_device *dev, void *data,
1026 struct drm_file *file_priv)
1027{
1028 struct drm_modeset_ctl *modeset = data;
Dave Airlie19227562011-02-24 08:35:06 +10001029 int ret = 0;
1030 unsigned int crtc;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001031
1032 /* If drm_vblank_init() hasn't been called yet, just no-op */
1033 if (!dev->num_crtcs)
1034 goto out;
1035
1036 crtc = modeset->crtc;
1037 if (crtc >= dev->num_crtcs) {
1038 ret = -EINVAL;
1039 goto out;
1040 }
1041
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001042 switch (modeset->cmd) {
1043 case _DRM_PRE_MODESET:
Dave Airlief453ba02008-11-07 14:05:41 -08001044 drm_vblank_pre_modeset(dev, crtc);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001045 break;
1046 case _DRM_POST_MODESET:
Dave Airlief453ba02008-11-07 14:05:41 -08001047 drm_vblank_post_modeset(dev, crtc);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001048 break;
1049 default:
1050 ret = -EINVAL;
1051 break;
1052 }
1053
1054out:
1055 return ret;
1056}
1057
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001058static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
1059 union drm_wait_vblank *vblwait,
1060 struct drm_file *file_priv)
1061{
1062 struct drm_pending_vblank_event *e;
1063 struct timeval now;
1064 unsigned long flags;
1065 unsigned int seq;
Chris Wilsonea5d5522010-12-01 19:41:31 +00001066 int ret;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001067
1068 e = kzalloc(sizeof *e, GFP_KERNEL);
Chris Wilsonea5d5522010-12-01 19:41:31 +00001069 if (e == NULL) {
1070 ret = -ENOMEM;
1071 goto err_put;
1072 }
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001073
1074 e->pipe = pipe;
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001075 e->base.pid = current->pid;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001076 e->event.base.type = DRM_EVENT_VBLANK;
1077 e->event.base.length = sizeof e->event;
1078 e->event.user_data = vblwait->request.signal;
1079 e->base.event = &e->event.base;
1080 e->base.file_priv = file_priv;
1081 e->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
1082
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001083 spin_lock_irqsave(&dev->event_lock, flags);
1084
1085 if (file_priv->event_space < sizeof e->event) {
Chris Wilsonea5d5522010-12-01 19:41:31 +00001086 ret = -EBUSY;
1087 goto err_unlock;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001088 }
1089
1090 file_priv->event_space -= sizeof e->event;
Mario Kleiner27641c32010-10-23 04:20:23 +02001091 seq = drm_vblank_count_and_time(dev, pipe, &now);
1092
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001093 if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) &&
1094 (seq - vblwait->request.sequence) <= (1 << 23)) {
1095 vblwait->request.sequence = seq + 1;
Jesse Barnes4a921642009-11-10 08:21:25 +00001096 vblwait->reply.sequence = vblwait->request.sequence;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001097 }
1098
1099 DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n",
1100 vblwait->request.sequence, seq, pipe);
1101
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001102 trace_drm_vblank_event_queued(current->pid, pipe,
1103 vblwait->request.sequence);
1104
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001105 e->event.sequence = vblwait->request.sequence;
1106 if ((seq - vblwait->request.sequence) <= (1 << 23)) {
Mario Kleiner000fa7c2010-12-10 16:00:19 +01001107 e->event.sequence = seq;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001108 e->event.tv_sec = now.tv_sec;
1109 e->event.tv_usec = now.tv_usec;
Dan Carpenter6f331622010-12-09 08:35:40 +03001110 drm_vblank_put(dev, pipe);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001111 list_add_tail(&e->base.link, &e->base.file_priv->event_list);
1112 wake_up_interruptible(&e->base.file_priv->event_wait);
Mario Kleiner000fa7c2010-12-10 16:00:19 +01001113 vblwait->reply.sequence = seq;
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001114 trace_drm_vblank_event_delivered(current->pid, pipe,
1115 vblwait->request.sequence);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001116 } else {
1117 list_add_tail(&e->base.link, &dev->vblank_event_list);
Mario Kleiner000fa7c2010-12-10 16:00:19 +01001118 vblwait->reply.sequence = vblwait->request.sequence;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001119 }
1120
1121 spin_unlock_irqrestore(&dev->event_lock, flags);
1122
1123 return 0;
Chris Wilsonea5d5522010-12-01 19:41:31 +00001124
1125err_unlock:
1126 spin_unlock_irqrestore(&dev->event_lock, flags);
1127 kfree(e);
1128err_put:
Dan Carpenter6f331622010-12-09 08:35:40 +03001129 drm_vblank_put(dev, pipe);
Chris Wilsonea5d5522010-12-01 19:41:31 +00001130 return ret;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001131}
1132
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001133/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 * Wait for VBLANK.
1135 *
1136 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +10001137 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 * \param cmd command.
1139 * \param data user argument, pointing to a drm_wait_vblank structure.
1140 * \return zero on success or a negative number on failure.
1141 *
Eric Anholt30b23632009-01-27 21:19:41 -08001142 * This function enables the vblank interrupt on the pipe requested, then
1143 * sleeps waiting for the requested sequence number to occur, and drops
1144 * the vblank interrupt refcount afterwards. (vblank irq disable follows that
1145 * after a timeout with no further vblank waits scheduled).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001147int drm_wait_vblank(struct drm_device *dev, void *data,
1148 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149{
Eric Anholtc153f452007-09-03 12:06:45 +10001150 union drm_wait_vblank *vblwait = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 int ret = 0;
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001152 unsigned int flags, seq, crtc, high_crtc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153
Jordan Crousedcdb1672010-05-27 13:40:25 -06001154 if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 return -EINVAL;
1156
Eric Anholt30b23632009-01-27 21:19:41 -08001157 if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
1158 return -EINVAL;
1159
Eric Anholtc153f452007-09-03 12:06:45 +10001160 if (vblwait->request.type &
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001161 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
1162 _DRM_VBLANK_HIGH_CRTC_MASK)) {
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001163 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
Eric Anholtc153f452007-09-03 12:06:45 +10001164 vblwait->request.type,
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001165 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
1166 _DRM_VBLANK_HIGH_CRTC_MASK));
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001167 return -EINVAL;
1168 }
1169
Eric Anholtc153f452007-09-03 12:06:45 +10001170 flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001171 high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK);
1172 if (high_crtc)
1173 crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT;
1174 else
1175 crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001176 if (crtc >= dev->num_crtcs)
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001177 return -EINVAL;
1178
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001179 ret = drm_vblank_get(dev, crtc);
1180 if (ret) {
Paul Rolland8d3457e2009-08-09 12:24:01 +10001181 DRM_DEBUG("failed to acquire vblank counter, %d\n", ret);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001182 return ret;
1183 }
1184 seq = drm_vblank_count(dev, crtc);
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001185
Eric Anholtc153f452007-09-03 12:06:45 +10001186 switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 case _DRM_VBLANK_RELATIVE:
Eric Anholtc153f452007-09-03 12:06:45 +10001188 vblwait->request.sequence += seq;
1189 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 case _DRM_VBLANK_ABSOLUTE:
1191 break;
1192 default:
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001193 ret = -EINVAL;
1194 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 }
1196
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001197 if (flags & _DRM_VBLANK_EVENT)
1198 return drm_queue_vblank_event(dev, crtc, vblwait, file_priv);
1199
=?utf-8?q?Michel_D=C3=A4nzer?=ab285d72006-10-24 23:34:18 +10001200 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
Eric Anholtc153f452007-09-03 12:06:45 +10001201 (seq - vblwait->request.sequence) <= (1<<23)) {
1202 vblwait->request.sequence = seq + 1;
=?utf-8?q?Michel_D=C3=A4nzer?=ab285d72006-10-24 23:34:18 +10001203 }
1204
Eric Anholt30b23632009-01-27 21:19:41 -08001205 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
1206 vblwait->request.sequence, crtc);
1207 dev->last_vblank_wait[crtc] = vblwait->request.sequence;
1208 DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
1209 (((drm_vblank_count(dev, crtc) -
1210 vblwait->request.sequence) <= (1 << 23)) ||
1211 !dev->irq_enabled));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212
Eric Anholt30b23632009-01-27 21:19:41 -08001213 if (ret != -EINTR) {
1214 struct timeval now;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215
Mario Kleiner27641c32010-10-23 04:20:23 +02001216 vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now);
Eric Anholt30b23632009-01-27 21:19:41 -08001217 vblwait->reply.tval_sec = now.tv_sec;
1218 vblwait->reply.tval_usec = now.tv_usec;
Mario Kleiner27641c32010-10-23 04:20:23 +02001219
Eric Anholt30b23632009-01-27 21:19:41 -08001220 DRM_DEBUG("returning %d to client\n",
1221 vblwait->reply.sequence);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 } else {
Eric Anholt30b23632009-01-27 21:19:41 -08001223 DRM_DEBUG("vblank wait interrupted by signal\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 }
1225
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001226done:
1227 drm_vblank_put(dev, crtc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 return ret;
1229}
1230
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001231void drm_handle_vblank_events(struct drm_device *dev, int crtc)
1232{
1233 struct drm_pending_vblank_event *e, *t;
1234 struct timeval now;
1235 unsigned long flags;
1236 unsigned int seq;
1237
Mario Kleiner27641c32010-10-23 04:20:23 +02001238 seq = drm_vblank_count_and_time(dev, crtc, &now);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001239
1240 spin_lock_irqsave(&dev->event_lock, flags);
1241
1242 list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
1243 if (e->pipe != crtc)
1244 continue;
1245 if ((seq - e->event.sequence) > (1<<23))
1246 continue;
1247
1248 DRM_DEBUG("vblank event on %d, current %d\n",
1249 e->event.sequence, seq);
1250
1251 e->event.sequence = seq;
1252 e->event.tv_sec = now.tv_sec;
1253 e->event.tv_usec = now.tv_usec;
1254 drm_vblank_put(dev, e->pipe);
1255 list_move_tail(&e->base.link, &e->base.file_priv->event_list);
1256 wake_up_interruptible(&e->base.file_priv->event_wait);
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001257 trace_drm_vblank_event_delivered(e->base.pid, e->pipe,
1258 e->event.sequence);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001259 }
1260
1261 spin_unlock_irqrestore(&dev->event_lock, flags);
Jesse Barnesac2874b2010-07-01 16:47:31 -07001262
1263 trace_drm_vblank_event(crtc, seq);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001264}
1265
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001267 * drm_handle_vblank - handle a vblank event
1268 * @dev: DRM device
1269 * @crtc: where this event occurred
1270 *
1271 * Drivers should call this routine in their vblank interrupt handlers to
1272 * update the vblank counter and send any signals that may be pending.
1273 */
Chris Wilson78c6e172011-01-31 10:48:04 +00001274bool drm_handle_vblank(struct drm_device *dev, int crtc)
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001275{
Mario Kleiner27641c32010-10-23 04:20:23 +02001276 u32 vblcount;
1277 s64 diff_ns;
1278 struct timeval tvblank;
1279 unsigned long irqflags;
1280
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001281 if (!dev->num_crtcs)
Chris Wilson78c6e172011-01-31 10:48:04 +00001282 return false;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001283
Mario Kleiner27641c32010-10-23 04:20:23 +02001284 /* Need timestamp lock to prevent concurrent execution with
1285 * vblank enable/disable, as this would cause inconsistent
1286 * or corrupted timestamps and vblank counts.
1287 */
1288 spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
1289
1290 /* Vblank irq handling disabled. Nothing to do. */
1291 if (!dev->vblank_enabled[crtc]) {
1292 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
Chris Wilson78c6e172011-01-31 10:48:04 +00001293 return false;
Mario Kleiner27641c32010-10-23 04:20:23 +02001294 }
1295
1296 /* Fetch corresponding timestamp for this vblank interval from
1297 * driver and store it in proper slot of timestamp ringbuffer.
1298 */
1299
1300 /* Get current timestamp and count. */
1301 vblcount = atomic_read(&dev->_vblank_count[crtc]);
1302 drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ);
1303
1304 /* Compute time difference to timestamp of last vblank */
1305 diff_ns = timeval_to_ns(&tvblank) -
1306 timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
1307
1308 /* Update vblank timestamp and count if at least
1309 * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds
1310 * difference between last stored timestamp and current
1311 * timestamp. A smaller difference means basically
1312 * identical timestamps. Happens if this vblank has
1313 * been already processed and this is a redundant call,
1314 * e.g., due to spurious vblank interrupts. We need to
1315 * ignore those for accounting.
1316 */
Mario Kleinerc4cc3832011-02-21 05:42:00 +01001317 if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) {
Mario Kleiner27641c32010-10-23 04:20:23 +02001318 /* Store new timestamp in ringbuffer. */
1319 vblanktimestamp(dev, crtc, vblcount + 1) = tvblank;
Mario Kleiner27641c32010-10-23 04:20:23 +02001320
1321 /* Increment cooked vblank count. This also atomically commits
1322 * the timestamp computed above.
1323 */
Mario Kleinerbc215122011-02-21 05:42:01 +01001324 smp_mb__before_atomic_inc();
Mario Kleiner27641c32010-10-23 04:20:23 +02001325 atomic_inc(&dev->_vblank_count[crtc]);
Mario Kleinerbc215122011-02-21 05:42:01 +01001326 smp_mb__after_atomic_inc();
Mario Kleiner27641c32010-10-23 04:20:23 +02001327 } else {
1328 DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n",
1329 crtc, (int) diff_ns);
1330 }
1331
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001332 DRM_WAKEUP(&dev->vbl_queue[crtc]);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001333 drm_handle_vblank_events(dev, crtc);
Mario Kleiner27641c32010-10-23 04:20:23 +02001334
1335 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
Chris Wilson78c6e172011-01-31 10:48:04 +00001336 return true;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001337}
1338EXPORT_SYMBOL(drm_handle_vblank);