blob: 03f16f352fe2e9e9b309008c182b33954fc46f93 [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>
Paul Gortmaker2d1a8a42011-08-30 18:16:33 -040043#include <linux/export.h>
Mario Kleiner27641c32010-10-23 04:20:23 +020044
45/* Access macro for slots in vblank timestamp ringbuffer. */
46#define vblanktimestamp(dev, crtc, count) ( \
47 (dev)->_vblank_time[(crtc) * DRM_VBLANKTIME_RBSIZE + \
48 ((count) % DRM_VBLANKTIME_RBSIZE)])
49
50/* Retry timestamp calculation up to 3 times to satisfy
51 * drm_timestamp_precision before giving up.
52 */
53#define DRM_TIMESTAMP_MAXRETRIES 3
54
55/* Threshold in nanoseconds for detection of redundant
56 * vblank irq in drm_handle_vblank(). 1 msec should be ok.
57 */
58#define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
59
Linus Torvalds1da177e2005-04-16 15:20:36 -070060/**
61 * Get interrupt from bus id.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100062 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +100064 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 * \param cmd command.
66 * \param arg user argument, pointing to a drm_irq_busid structure.
67 * \return zero on success or a negative number on failure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100068 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 * Finds the PCI device with the specified bus id and gets its IRQ number.
70 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
71 * to that of the device that this DRM instance attached to.
72 */
Eric Anholtc153f452007-09-03 12:06:45 +100073int drm_irq_by_busid(struct drm_device *dev, void *data,
74 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
Eric Anholtc153f452007-09-03 12:06:45 +100076 struct drm_irq_busid *p = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Dave Airlie8410ea32010-12-15 03:16:38 +100078 if (!dev->driver->bus->irq_by_busid)
Jordan Crousedcdb1672010-05-27 13:40:25 -060079 return -EINVAL;
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
82 return -EINVAL;
83
Dave Airlie8410ea32010-12-15 03:16:38 +100084 return dev->driver->bus->irq_by_busid(dev, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085}
86
Mario Kleiner27641c32010-10-23 04:20:23 +020087/*
88 * Clear vblank timestamp buffer for a crtc.
89 */
90static void clear_vblank_timestamps(struct drm_device *dev, int crtc)
91{
92 memset(&dev->_vblank_time[crtc * DRM_VBLANKTIME_RBSIZE], 0,
93 DRM_VBLANKTIME_RBSIZE * sizeof(struct timeval));
94}
95
96/*
97 * Disable vblank irq's on crtc, make sure that last vblank count
98 * of hardware and corresponding consistent software vblank counter
99 * are preserved, even if there are any spurious vblank irq's after
100 * disable.
101 */
102static void vblank_disable_and_save(struct drm_device *dev, int crtc)
103{
104 unsigned long irqflags;
105 u32 vblcount;
106 s64 diff_ns;
107 int vblrc;
108 struct timeval tvblank;
109
110 /* Prevent vblank irq processing while disabling vblank irqs,
111 * so no updates of timestamps or count can happen after we've
112 * disabled. Needed to prevent races in case of delayed irq's.
Mario Kleiner27641c32010-10-23 04:20:23 +0200113 */
Mario Kleiner27641c32010-10-23 04:20:23 +0200114 spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
115
116 dev->driver->disable_vblank(dev, crtc);
117 dev->vblank_enabled[crtc] = 0;
118
119 /* No further vblank irq's will be processed after
120 * this point. Get current hardware vblank count and
121 * vblank timestamp, repeat until they are consistent.
122 *
123 * FIXME: There is still a race condition here and in
124 * drm_update_vblank_count() which can cause off-by-one
125 * reinitialization of software vblank counter. If gpu
126 * vblank counter doesn't increment exactly at the leading
127 * edge of a vblank interval, then we can lose 1 count if
128 * we happen to execute between start of vblank and the
129 * delayed gpu counter increment.
130 */
131 do {
132 dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc);
133 vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0);
134 } while (dev->last_vblank[crtc] != dev->driver->get_vblank_counter(dev, crtc));
135
136 /* Compute time difference to stored timestamp of last vblank
137 * as updated by last invocation of drm_handle_vblank() in vblank irq.
138 */
139 vblcount = atomic_read(&dev->_vblank_count[crtc]);
140 diff_ns = timeval_to_ns(&tvblank) -
141 timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
142
143 /* If there is at least 1 msec difference between the last stored
144 * timestamp and tvblank, then we are currently executing our
145 * disable inside a new vblank interval, the tvblank timestamp
146 * corresponds to this new vblank interval and the irq handler
147 * for this vblank didn't run yet and won't run due to our disable.
148 * Therefore we need to do the job of drm_handle_vblank() and
149 * increment the vblank counter by one to account for this vblank.
150 *
151 * Skip this step if there isn't any high precision timestamp
152 * available. In that case we can't account for this and just
153 * hope for the best.
154 */
Mario Kleinerbc215122011-02-21 05:42:01 +0100155 if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) {
Mario Kleiner27641c32010-10-23 04:20:23 +0200156 atomic_inc(&dev->_vblank_count[crtc]);
Mario Kleinerbc215122011-02-21 05:42:01 +0100157 smp_mb__after_atomic_inc();
158 }
Mario Kleiner27641c32010-10-23 04:20:23 +0200159
160 /* Invalidate all timestamps while vblank irq's are off. */
161 clear_vblank_timestamps(dev, crtc);
162
163 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
Mario Kleiner27641c32010-10-23 04:20:23 +0200164}
165
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700166static void vblank_disable_fn(unsigned long arg)
167{
168 struct drm_device *dev = (struct drm_device *)arg;
169 unsigned long irqflags;
170 int i;
171
172 if (!dev->vblank_disable_allowed)
173 return;
174
175 for (i = 0; i < dev->num_crtcs; i++) {
176 spin_lock_irqsave(&dev->vbl_lock, irqflags);
177 if (atomic_read(&dev->vblank_refcount[i]) == 0 &&
178 dev->vblank_enabled[i]) {
179 DRM_DEBUG("disabling vblank on crtc %d\n", i);
Mario Kleiner27641c32010-10-23 04:20:23 +0200180 vblank_disable_and_save(dev, i);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700181 }
182 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
183 }
184}
185
Keith Packard52440212008-11-18 09:30:25 -0800186void drm_vblank_cleanup(struct drm_device *dev)
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700187{
188 /* Bail if the driver didn't call drm_vblank_init() */
189 if (dev->num_crtcs == 0)
190 return;
191
Laurent Pinchart7eb3b2c2012-05-17 13:27:19 +0200192 del_timer_sync(&dev->vblank_disable_timer);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700193
194 vblank_disable_fn((unsigned long)dev);
195
Eric Anholt9a298b22009-03-24 12:23:04 -0700196 kfree(dev->vbl_queue);
197 kfree(dev->_vblank_count);
198 kfree(dev->vblank_refcount);
199 kfree(dev->vblank_enabled);
200 kfree(dev->last_vblank);
201 kfree(dev->last_vblank_wait);
202 kfree(dev->vblank_inmodeset);
Mario Kleiner27641c32010-10-23 04:20:23 +0200203 kfree(dev->_vblank_time);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700204
205 dev->num_crtcs = 0;
206}
Jerome Glissee77cef92010-01-07 15:39:13 +0100207EXPORT_SYMBOL(drm_vblank_cleanup);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700208
209int drm_vblank_init(struct drm_device *dev, int num_crtcs)
210{
211 int i, ret = -ENOMEM;
212
213 setup_timer(&dev->vblank_disable_timer, vblank_disable_fn,
214 (unsigned long)dev);
215 spin_lock_init(&dev->vbl_lock);
Mario Kleiner27641c32010-10-23 04:20:23 +0200216 spin_lock_init(&dev->vblank_time_lock);
217
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700218 dev->num_crtcs = num_crtcs;
219
Eric Anholt9a298b22009-03-24 12:23:04 -0700220 dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs,
221 GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700222 if (!dev->vbl_queue)
223 goto err;
224
Eric Anholt9a298b22009-03-24 12:23:04 -0700225 dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700226 if (!dev->_vblank_count)
227 goto err;
228
Eric Anholt9a298b22009-03-24 12:23:04 -0700229 dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs,
230 GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700231 if (!dev->vblank_refcount)
232 goto err;
233
Eric Anholt9a298b22009-03-24 12:23:04 -0700234 dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700235 if (!dev->vblank_enabled)
236 goto err;
237
Eric Anholt9a298b22009-03-24 12:23:04 -0700238 dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700239 if (!dev->last_vblank)
240 goto err;
241
Eric Anholt9a298b22009-03-24 12:23:04 -0700242 dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
Eric Anholtfede5c92008-12-19 17:23:38 -0800243 if (!dev->last_vblank_wait)
244 goto err;
245
Eric Anholt9a298b22009-03-24 12:23:04 -0700246 dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700247 if (!dev->vblank_inmodeset)
248 goto err;
249
Mario Kleiner27641c32010-10-23 04:20:23 +0200250 dev->_vblank_time = kcalloc(num_crtcs * DRM_VBLANKTIME_RBSIZE,
251 sizeof(struct timeval), GFP_KERNEL);
252 if (!dev->_vblank_time)
253 goto err;
254
255 DRM_INFO("Supports vblank timestamp caching Rev 1 (10.10.2010).\n");
256
257 /* Driver specific high-precision vblank timestamping supported? */
258 if (dev->driver->get_vblank_timestamp)
259 DRM_INFO("Driver supports precise vblank timestamp query.\n");
260 else
261 DRM_INFO("No driver support for vblank timestamp query.\n");
262
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700263 /* Zero per-crtc vblank stuff */
264 for (i = 0; i < num_crtcs; i++) {
265 init_waitqueue_head(&dev->vbl_queue[i]);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700266 atomic_set(&dev->_vblank_count[i], 0);
267 atomic_set(&dev->vblank_refcount[i], 0);
268 }
269
270 dev->vblank_disable_allowed = 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700271 return 0;
272
273err:
274 drm_vblank_cleanup(dev);
275 return ret;
276}
277EXPORT_SYMBOL(drm_vblank_init);
278
Dave Airlie28d52042009-09-21 14:33:58 +1000279static void drm_irq_vgaarb_nokms(void *cookie, bool state)
280{
281 struct drm_device *dev = cookie;
282
283 if (dev->driver->vgaarb_irq) {
284 dev->driver->vgaarb_irq(dev, state);
285 return;
286 }
287
288 if (!dev->irq_enabled)
289 return;
290
Joonyoung Shim5037f8a2011-08-04 05:41:01 +0000291 if (state) {
292 if (dev->driver->irq_uninstall)
293 dev->driver->irq_uninstall(dev);
294 } else {
295 if (dev->driver->irq_preinstall)
296 dev->driver->irq_preinstall(dev);
297 if (dev->driver->irq_postinstall)
298 dev->driver->irq_postinstall(dev);
Dave Airlie28d52042009-09-21 14:33:58 +1000299 }
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
Sascha Hauer884a53e2012-02-29 09:06:21 +0100308 * \c irq_preinstall() and \c irq_postinstall() functions
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 * 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{
Laurent Pinchart4a1b0712012-05-17 13:27:21 +0200313 int ret;
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 */
Joonyoung Shim5037f8a2011-08-04 05:41:01 +0000341 if (dev->driver->irq_preinstall)
342 dev->driver->irq_preinstall(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000344 /* Install handler */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
Thomas Gleixner935f6e32006-07-01 19:29:34 -0700346 sh_flags = IRQF_SHARED;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000347
Dave Airlieb8da7de2009-06-02 16:50:35 +1000348 if (dev->devname)
349 irqname = dev->devname;
350 else
351 irqname = dev->driver->name;
352
Jesse Barnes9bfbd5c2008-09-15 15:00:33 -0700353 ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler,
Dave Airlieb8da7de2009-06-02 16:50:35 +1000354 sh_flags, irqname, dev);
Jesse Barnes9bfbd5c2008-09-15 15:00:33 -0700355
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000356 if (ret < 0) {
Dave Airlie30e2fb12006-02-02 19:37:46 +1100357 mutex_lock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 dev->irq_enabled = 0;
Dave Airlie30e2fb12006-02-02 19:37:46 +1100359 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 return ret;
361 }
362
Dave Airlie28d52042009-09-21 14:33:58 +1000363 if (!drm_core_check_feature(dev, DRIVER_MODESET))
364 vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL);
365
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000366 /* After installing handler */
Joonyoung Shim5037f8a2011-08-04 05:41:01 +0000367 if (dev->driver->irq_postinstall)
368 ret = dev->driver->irq_postinstall(dev);
369
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700370 if (ret < 0) {
371 mutex_lock(&dev->struct_mutex);
372 dev->irq_enabled = 0;
373 mutex_unlock(&dev->struct_mutex);
Joonyoung Shime1c44ac2011-08-04 05:41:00 +0000374 if (!drm_core_check_feature(dev, DRIVER_MODESET))
375 vga_client_register(dev->pdev, NULL, NULL, NULL);
376 free_irq(drm_dev_to_irq(dev), dev);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700377 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700379 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380}
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700381EXPORT_SYMBOL(drm_irq_install);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
383/**
384 * Uninstall the IRQ handler.
385 *
386 * \param dev DRM device.
387 *
Sascha Hauer884a53e2012-02-29 09:06:21 +0100388 * Calls the driver's \c irq_uninstall() function, and stops the irq.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 */
Mario Kleiner27641c32010-10-23 04:20:23 +0200390int drm_irq_uninstall(struct drm_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391{
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800392 unsigned long irqflags;
393 int irq_enabled, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
395 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
396 return -EINVAL;
397
Dave Airlie30e2fb12006-02-02 19:37:46 +1100398 mutex_lock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 irq_enabled = dev->irq_enabled;
400 dev->irq_enabled = 0;
Dave Airlie30e2fb12006-02-02 19:37:46 +1100401 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800403 /*
404 * Wake up any waiters so they don't hang.
405 */
Ben Skeggsbde48892011-07-04 12:52:27 +1000406 if (dev->num_crtcs) {
407 spin_lock_irqsave(&dev->vbl_lock, irqflags);
408 for (i = 0; i < dev->num_crtcs; i++) {
409 DRM_WAKEUP(&dev->vbl_queue[i]);
410 dev->vblank_enabled[i] = 0;
411 dev->last_vblank[i] =
412 dev->driver->get_vblank_counter(dev, i);
413 }
414 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800415 }
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800416
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000417 if (!irq_enabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 return -EINVAL;
419
Jordan Crousedcdb1672010-05-27 13:40:25 -0600420 DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
Dave Airlie28d52042009-09-21 14:33:58 +1000422 if (!drm_core_check_feature(dev, DRIVER_MODESET))
423 vga_client_register(dev->pdev, NULL, NULL, NULL);
424
Joonyoung Shim5037f8a2011-08-04 05:41:01 +0000425 if (dev->driver->irq_uninstall)
426 dev->driver->irq_uninstall(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Jordan Crousedcdb1672010-05-27 13:40:25 -0600428 free_irq(drm_dev_to_irq(dev), dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
430 return 0;
431}
432EXPORT_SYMBOL(drm_irq_uninstall);
433
434/**
435 * IRQ control ioctl.
436 *
437 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +1000438 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 * \param cmd command.
440 * \param arg user argument, pointing to a drm_control structure.
441 * \return zero on success or a negative number on failure.
442 *
443 * Calls irq_install() or irq_uninstall() according to \p arg.
444 */
Eric Anholtc153f452007-09-03 12:06:45 +1000445int drm_control(struct drm_device *dev, void *data,
446 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447{
Eric Anholtc153f452007-09-03 12:06:45 +1000448 struct drm_control *ctl = data;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000449
Mario Kleiner27641c32010-10-23 04:20:23 +0200450 /* if we haven't irq we fallback for compatibility reasons -
451 * this used to be a separate function in drm_dma.h
452 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
Eric Anholtc153f452007-09-03 12:06:45 +1000455 switch (ctl->func) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 case DRM_INST_HANDLER:
457 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
458 return 0;
Dave Airlief453ba02008-11-07 14:05:41 -0800459 if (drm_core_check_feature(dev, DRIVER_MODESET))
460 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
Jordan Crousedcdb1672010-05-27 13:40:25 -0600462 ctl->irq != drm_dev_to_irq(dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 return -EINVAL;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000464 return drm_irq_install(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 case DRM_UNINST_HANDLER:
466 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
467 return 0;
Dave Airlief453ba02008-11-07 14:05:41 -0800468 if (drm_core_check_feature(dev, DRIVER_MODESET))
469 return 0;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000470 return drm_irq_uninstall(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 default:
472 return -EINVAL;
473 }
474}
475
476/**
Mario Kleiner27641c32010-10-23 04:20:23 +0200477 * drm_calc_timestamping_constants - Calculate and
478 * store various constants which are later needed by
479 * vblank and swap-completion timestamping, e.g, by
480 * drm_calc_vbltimestamp_from_scanoutpos().
481 * They are derived from crtc's true scanout timing,
482 * so they take things like panel scaling or other
483 * adjustments into account.
484 *
485 * @crtc drm_crtc whose timestamp constants should be updated.
486 *
487 */
488void drm_calc_timestamping_constants(struct drm_crtc *crtc)
489{
490 s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0;
491 u64 dotclock;
492
493 /* Dot clock in Hz: */
494 dotclock = (u64) crtc->hwmode.clock * 1000;
495
Mario Kleiner9be6f8a2011-02-21 05:42:02 +0100496 /* Fields of interlaced scanout modes are only halve a frame duration.
497 * Double the dotclock to get halve the frame-/line-/pixelduration.
498 */
499 if (crtc->hwmode.flags & DRM_MODE_FLAG_INTERLACE)
500 dotclock *= 2;
501
Mario Kleiner27641c32010-10-23 04:20:23 +0200502 /* Valid dotclock? */
503 if (dotclock > 0) {
504 /* Convert scanline length in pixels and video dot clock to
505 * line duration, frame duration and pixel duration in
506 * nanoseconds:
507 */
508 pixeldur_ns = (s64) div64_u64(1000000000, dotclock);
509 linedur_ns = (s64) div64_u64(((u64) crtc->hwmode.crtc_htotal *
510 1000000000), dotclock);
511 framedur_ns = (s64) crtc->hwmode.crtc_vtotal * linedur_ns;
512 } else
513 DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n",
514 crtc->base.id);
515
516 crtc->pixeldur_ns = pixeldur_ns;
517 crtc->linedur_ns = linedur_ns;
518 crtc->framedur_ns = framedur_ns;
519
520 DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n",
521 crtc->base.id, crtc->hwmode.crtc_htotal,
522 crtc->hwmode.crtc_vtotal, crtc->hwmode.crtc_vdisplay);
523 DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n",
524 crtc->base.id, (int) dotclock/1000, (int) framedur_ns,
525 (int) linedur_ns, (int) pixeldur_ns);
526}
527EXPORT_SYMBOL(drm_calc_timestamping_constants);
528
529/**
530 * drm_calc_vbltimestamp_from_scanoutpos - helper routine for kms
531 * drivers. Implements calculation of exact vblank timestamps from
532 * given drm_display_mode timings and current video scanout position
533 * of a crtc. This can be called from within get_vblank_timestamp()
534 * implementation of a kms driver to implement the actual timestamping.
535 *
536 * Should return timestamps conforming to the OML_sync_control OpenML
537 * extension specification. The timestamp corresponds to the end of
538 * the vblank interval, aka start of scanout of topmost-leftmost display
539 * pixel in the following video frame.
540 *
541 * Requires support for optional dev->driver->get_scanout_position()
542 * in kms driver, plus a bit of setup code to provide a drm_display_mode
543 * that corresponds to the true scanout timing.
544 *
545 * The current implementation only handles standard video modes. It
546 * returns as no operation if a doublescan or interlaced video mode is
547 * active. Higher level code is expected to handle this.
548 *
549 * @dev: DRM device.
550 * @crtc: Which crtc's vblank timestamp to retrieve.
551 * @max_error: Desired maximum allowable error in timestamps (nanosecs).
552 * On return contains true maximum error of timestamp.
553 * @vblank_time: Pointer to struct timeval which should receive the timestamp.
554 * @flags: Flags to pass to driver:
555 * 0 = Default.
556 * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler.
557 * @refcrtc: drm_crtc* of crtc which defines scanout timing.
558 *
559 * Returns negative value on error, failure or if not supported in current
560 * video mode:
561 *
562 * -EINVAL - Invalid crtc.
563 * -EAGAIN - Temporary unavailable, e.g., called before initial modeset.
564 * -ENOTSUPP - Function not supported in current display mode.
565 * -EIO - Failed, e.g., due to failed scanout position query.
566 *
567 * Returns or'ed positive status flags on success:
568 *
569 * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.
570 * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.
571 *
572 */
573int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
574 int *max_error,
575 struct timeval *vblank_time,
576 unsigned flags,
577 struct drm_crtc *refcrtc)
578{
579 struct timeval stime, raw_time;
580 struct drm_display_mode *mode;
581 int vbl_status, vtotal, vdisplay;
582 int vpos, hpos, i;
583 s64 framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns;
584 bool invbl;
585
586 if (crtc < 0 || crtc >= dev->num_crtcs) {
587 DRM_ERROR("Invalid crtc %d\n", crtc);
588 return -EINVAL;
589 }
590
591 /* Scanout position query not supported? Should not happen. */
592 if (!dev->driver->get_scanout_position) {
593 DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
594 return -EIO;
595 }
596
597 mode = &refcrtc->hwmode;
598 vtotal = mode->crtc_vtotal;
599 vdisplay = mode->crtc_vdisplay;
600
601 /* Durations of frames, lines, pixels in nanoseconds. */
602 framedur_ns = refcrtc->framedur_ns;
603 linedur_ns = refcrtc->linedur_ns;
604 pixeldur_ns = refcrtc->pixeldur_ns;
605
606 /* If mode timing undefined, just return as no-op:
607 * Happens during initial modesetting of a crtc.
608 */
609 if (vtotal <= 0 || vdisplay <= 0 || framedur_ns == 0) {
610 DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc);
611 return -EAGAIN;
612 }
613
Mario Kleiner27641c32010-10-23 04:20:23 +0200614 /* Get current scanout position with system timestamp.
615 * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times
616 * if single query takes longer than max_error nanoseconds.
617 *
618 * This guarantees a tight bound on maximum error if
619 * code gets preempted or delayed for some reason.
620 */
621 for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) {
622 /* Disable preemption to make it very likely to
623 * succeed in the first iteration even on PREEMPT_RT kernel.
624 */
625 preempt_disable();
626
627 /* Get system timestamp before query. */
628 do_gettimeofday(&stime);
629
630 /* Get vertical and horizontal scanout pos. vpos, hpos. */
631 vbl_status = dev->driver->get_scanout_position(dev, crtc, &vpos, &hpos);
632
633 /* Get system timestamp after query. */
634 do_gettimeofday(&raw_time);
635
636 preempt_enable();
637
638 /* Return as no-op if scanout query unsupported or failed. */
639 if (!(vbl_status & DRM_SCANOUTPOS_VALID)) {
640 DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n",
641 crtc, vbl_status);
642 return -EIO;
643 }
644
645 duration_ns = timeval_to_ns(&raw_time) - timeval_to_ns(&stime);
646
647 /* Accept result with < max_error nsecs timing uncertainty. */
648 if (duration_ns <= (s64) *max_error)
649 break;
650 }
651
652 /* Noisy system timing? */
653 if (i == DRM_TIMESTAMP_MAXRETRIES) {
654 DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n",
655 crtc, (int) duration_ns/1000, *max_error/1000, i);
656 }
657
658 /* Return upper bound of timestamp precision error. */
659 *max_error = (int) duration_ns;
660
661 /* Check if in vblank area:
662 * vpos is >=0 in video scanout area, but negative
663 * within vblank area, counting down the number of lines until
664 * start of scanout.
665 */
666 invbl = vbl_status & DRM_SCANOUTPOS_INVBL;
667
668 /* Convert scanout position into elapsed time at raw_time query
669 * since start of scanout at first display scanline. delta_ns
670 * can be negative if start of scanout hasn't happened yet.
671 */
672 delta_ns = (s64) vpos * linedur_ns + (s64) hpos * pixeldur_ns;
673
674 /* Is vpos outside nominal vblank area, but less than
675 * 1/100 of a frame height away from start of vblank?
676 * If so, assume this isn't a massively delayed vblank
677 * interrupt, but a vblank interrupt that fired a few
678 * microseconds before true start of vblank. Compensate
679 * by adding a full frame duration to the final timestamp.
680 * Happens, e.g., on ATI R500, R600.
681 *
682 * We only do this if DRM_CALLED_FROM_VBLIRQ.
683 */
684 if ((flags & DRM_CALLED_FROM_VBLIRQ) && !invbl &&
685 ((vdisplay - vpos) < vtotal / 100)) {
686 delta_ns = delta_ns - framedur_ns;
687
688 /* Signal this correction as "applied". */
689 vbl_status |= 0x8;
690 }
691
692 /* Subtract time delta from raw timestamp to get final
693 * vblank_time timestamp for end of vblank.
694 */
695 *vblank_time = ns_to_timeval(timeval_to_ns(&raw_time) - delta_ns);
696
Joe Perchesbbb0aef2011-04-17 20:35:52 -0700697 DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",
698 crtc, (int)vbl_status, hpos, vpos,
699 (long)raw_time.tv_sec, (long)raw_time.tv_usec,
700 (long)vblank_time->tv_sec, (long)vblank_time->tv_usec,
701 (int)duration_ns/1000, i);
Mario Kleiner27641c32010-10-23 04:20:23 +0200702
703 vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD;
704 if (invbl)
705 vbl_status |= DRM_VBLANKTIME_INVBL;
706
707 return vbl_status;
708}
709EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
710
711/**
712 * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent
713 * vblank interval.
714 *
715 * @dev: DRM device
716 * @crtc: which crtc's vblank timestamp to retrieve
717 * @tvblank: Pointer to target struct timeval which should receive the timestamp
718 * @flags: Flags to pass to driver:
719 * 0 = Default.
720 * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler.
721 *
722 * Fetches the system timestamp corresponding to the time of the most recent
723 * vblank interval on specified crtc. May call into kms-driver to
724 * compute the timestamp with a high-precision GPU specific method.
725 *
726 * Returns zero if timestamp originates from uncorrected do_gettimeofday()
727 * call, i.e., it isn't very precisely locked to the true vblank.
728 *
729 * Returns non-zero if timestamp is considered to be very precise.
730 */
731u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
732 struct timeval *tvblank, unsigned flags)
733{
Laurent Pinchart4a1b0712012-05-17 13:27:21 +0200734 int ret;
Mario Kleiner27641c32010-10-23 04:20:23 +0200735
736 /* Define requested maximum error on timestamps (nanoseconds). */
737 int max_error = (int) drm_timestamp_precision * 1000;
738
739 /* Query driver if possible and precision timestamping enabled. */
740 if (dev->driver->get_vblank_timestamp && (max_error > 0)) {
741 ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error,
742 tvblank, flags);
743 if (ret > 0)
744 return (u32) ret;
745 }
746
747 /* GPU high precision timestamp query unsupported or failed.
748 * Return gettimeofday timestamp as best estimate.
749 */
750 do_gettimeofday(tvblank);
751
752 return 0;
753}
754EXPORT_SYMBOL(drm_get_last_vbltimestamp);
755
756/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700757 * drm_vblank_count - retrieve "cooked" vblank counter value
758 * @dev: DRM device
759 * @crtc: which counter to retrieve
760 *
761 * Fetches the "cooked" vblank count value that represents the number of
762 * vblank events since the system was booted, including lost events due to
763 * modesetting activity.
764 */
765u32 drm_vblank_count(struct drm_device *dev, int crtc)
766{
767 return atomic_read(&dev->_vblank_count[crtc]);
768}
769EXPORT_SYMBOL(drm_vblank_count);
770
771/**
Mario Kleiner27641c32010-10-23 04:20:23 +0200772 * drm_vblank_count_and_time - retrieve "cooked" vblank counter value
773 * and the system timestamp corresponding to that vblank counter value.
774 *
775 * @dev: DRM device
776 * @crtc: which counter to retrieve
777 * @vblanktime: Pointer to struct timeval to receive the vblank timestamp.
778 *
779 * Fetches the "cooked" vblank count value that represents the number of
780 * vblank events since the system was booted, including lost events due to
781 * modesetting activity. Returns corresponding system timestamp of the time
782 * of the vblank interval that corresponds to the current value vblank counter
783 * value.
784 */
785u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc,
786 struct timeval *vblanktime)
787{
788 u32 cur_vblank;
789
790 /* Read timestamp from slot of _vblank_time ringbuffer
791 * that corresponds to current vblank count. Retry if
792 * count has incremented during readout. This works like
793 * a seqlock.
794 */
795 do {
796 cur_vblank = atomic_read(&dev->_vblank_count[crtc]);
797 *vblanktime = vblanktimestamp(dev, crtc, cur_vblank);
798 smp_rmb();
799 } while (cur_vblank != atomic_read(&dev->_vblank_count[crtc]));
800
801 return cur_vblank;
802}
803EXPORT_SYMBOL(drm_vblank_count_and_time);
804
805/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700806 * drm_update_vblank_count - update the master vblank counter
807 * @dev: DRM device
808 * @crtc: counter to update
809 *
810 * Call back into the driver to update the appropriate vblank counter
811 * (specified by @crtc). Deal with wraparound, if it occurred, and
812 * update the last read value so we can deal with wraparound on the next
813 * call if necessary.
814 *
815 * Only necessary when going from off->on, to account for frames we
816 * didn't get an interrupt for.
817 *
818 * Note: caller must hold dev->vbl_lock since this reads & writes
819 * device vblank fields.
820 */
821static void drm_update_vblank_count(struct drm_device *dev, int crtc)
822{
Mario Kleiner27641c32010-10-23 04:20:23 +0200823 u32 cur_vblank, diff, tslot, rc;
824 struct timeval t_vblank;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700825
826 /*
827 * Interrupts were disabled prior to this call, so deal with counter
828 * wrap if needed.
829 * NOTE! It's possible we lost a full dev->max_vblank_count events
830 * here if the register is small or we had vblank interrupts off for
831 * a long time.
Mario Kleiner27641c32010-10-23 04:20:23 +0200832 *
833 * We repeat the hardware vblank counter & timestamp query until
834 * we get consistent results. This to prevent races between gpu
835 * updating its hardware counter while we are retrieving the
836 * corresponding vblank timestamp.
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700837 */
Mario Kleiner27641c32010-10-23 04:20:23 +0200838 do {
839 cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
840 rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0);
841 } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc));
842
843 /* Deal with counter wrap */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700844 diff = cur_vblank - dev->last_vblank[crtc];
845 if (cur_vblank < dev->last_vblank[crtc]) {
846 diff += dev->max_vblank_count;
847
848 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
849 crtc, dev->last_vblank[crtc], cur_vblank, diff);
850 }
851
852 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
853 crtc, diff);
854
Mario Kleiner27641c32010-10-23 04:20:23 +0200855 /* Reinitialize corresponding vblank timestamp if high-precision query
856 * available. Skip this step if query unsupported or failed. Will
857 * reinitialize delayed at next vblank interrupt in that case.
858 */
859 if (rc) {
860 tslot = atomic_read(&dev->_vblank_count[crtc]) + diff;
861 vblanktimestamp(dev, crtc, tslot) = t_vblank;
Mario Kleiner27641c32010-10-23 04:20:23 +0200862 }
863
Mario Kleinerbc215122011-02-21 05:42:01 +0100864 smp_mb__before_atomic_inc();
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700865 atomic_add(diff, &dev->_vblank_count[crtc]);
Mario Kleinerbc215122011-02-21 05:42:01 +0100866 smp_mb__after_atomic_inc();
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700867}
868
869/**
870 * drm_vblank_get - get a reference count on vblank events
871 * @dev: DRM device
872 * @crtc: which CRTC to own
873 *
874 * Acquire a reference count on vblank events to avoid having them disabled
875 * while in use.
876 *
877 * RETURNS
878 * Zero on success, nonzero on failure.
879 */
880int drm_vblank_get(struct drm_device *dev, int crtc)
881{
Mario Kleiner27641c32010-10-23 04:20:23 +0200882 unsigned long irqflags, irqflags2;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700883 int ret = 0;
884
885 spin_lock_irqsave(&dev->vbl_lock, irqflags);
886 /* Going from 0->1 means we have to enable interrupts again */
Li Peng778c9022009-11-09 12:51:22 +0800887 if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) {
Mario Kleiner27641c32010-10-23 04:20:23 +0200888 spin_lock_irqsave(&dev->vblank_time_lock, irqflags2);
Li Peng778c9022009-11-09 12:51:22 +0800889 if (!dev->vblank_enabled[crtc]) {
Mario Kleiner27641c32010-10-23 04:20:23 +0200890 /* Enable vblank irqs under vblank_time_lock protection.
891 * All vblank count & timestamp updates are held off
892 * until we are done reinitializing master counter and
893 * timestamps. Filtercode in drm_handle_vblank() will
894 * prevent double-accounting of same vblank interval.
895 */
Li Peng778c9022009-11-09 12:51:22 +0800896 ret = dev->driver->enable_vblank(dev, crtc);
Mario Kleiner27641c32010-10-23 04:20:23 +0200897 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n",
898 crtc, ret);
Li Peng778c9022009-11-09 12:51:22 +0800899 if (ret)
900 atomic_dec(&dev->vblank_refcount[crtc]);
901 else {
902 dev->vblank_enabled[crtc] = 1;
903 drm_update_vblank_count(dev, crtc);
904 }
905 }
Mario Kleiner27641c32010-10-23 04:20:23 +0200906 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2);
Li Peng778c9022009-11-09 12:51:22 +0800907 } else {
908 if (!dev->vblank_enabled[crtc]) {
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700909 atomic_dec(&dev->vblank_refcount[crtc]);
Li Peng778c9022009-11-09 12:51:22 +0800910 ret = -EINVAL;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700911 }
912 }
913 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
914
915 return ret;
916}
917EXPORT_SYMBOL(drm_vblank_get);
918
919/**
920 * drm_vblank_put - give up ownership of vblank events
921 * @dev: DRM device
922 * @crtc: which counter to give up
923 *
924 * Release ownership of a given vblank counter, turning off interrupts
Mario Kleiner27641c32010-10-23 04:20:23 +0200925 * if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700926 */
927void drm_vblank_put(struct drm_device *dev, int crtc)
928{
Mario Kleiner27641c32010-10-23 04:20:23 +0200929 BUG_ON(atomic_read(&dev->vblank_refcount[crtc]) == 0);
Chris Wilsonb3f5e732009-02-19 14:48:22 +0000930
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700931 /* Last user schedules interrupt disable */
Mario Kleiner27641c32010-10-23 04:20:23 +0200932 if (atomic_dec_and_test(&dev->vblank_refcount[crtc]) &&
933 (drm_vblank_offdelay > 0))
934 mod_timer(&dev->vblank_disable_timer,
935 jiffies + ((drm_vblank_offdelay * DRM_HZ)/1000));
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700936}
937EXPORT_SYMBOL(drm_vblank_put);
938
Li Peng778c9022009-11-09 12:51:22 +0800939void drm_vblank_off(struct drm_device *dev, int crtc)
940{
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +1000941 struct drm_pending_vblank_event *e, *t;
942 struct timeval now;
Li Peng778c9022009-11-09 12:51:22 +0800943 unsigned long irqflags;
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +1000944 unsigned int seq;
Li Peng778c9022009-11-09 12:51:22 +0800945
946 spin_lock_irqsave(&dev->vbl_lock, irqflags);
Mario Kleiner27641c32010-10-23 04:20:23 +0200947 vblank_disable_and_save(dev, crtc);
Li Peng778c9022009-11-09 12:51:22 +0800948 DRM_WAKEUP(&dev->vbl_queue[crtc]);
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +1000949
950 /* Send any queued vblank events, lest the natives grow disquiet */
951 seq = drm_vblank_count_and_time(dev, crtc, &now);
952 list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
953 if (e->pipe != crtc)
954 continue;
955 DRM_DEBUG("Sending premature vblank event on disable: \
956 wanted %d, current %d\n",
957 e->event.sequence, seq);
958
959 e->event.sequence = seq;
960 e->event.tv_sec = now.tv_sec;
961 e->event.tv_usec = now.tv_usec;
962 drm_vblank_put(dev, e->pipe);
963 list_move_tail(&e->base.link, &e->base.file_priv->event_list);
964 wake_up_interruptible(&e->base.file_priv->event_wait);
965 trace_drm_vblank_event_delivered(e->base.pid, e->pipe,
966 e->event.sequence);
967 }
968
Li Peng778c9022009-11-09 12:51:22 +0800969 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
970}
971EXPORT_SYMBOL(drm_vblank_off);
972
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700973/**
Dave Airlief453ba02008-11-07 14:05:41 -0800974 * drm_vblank_pre_modeset - account for vblanks across mode sets
975 * @dev: DRM device
976 * @crtc: CRTC in question
Dave Airlief453ba02008-11-07 14:05:41 -0800977 *
978 * Account for vblank events across mode setting events, which will likely
979 * reset the hardware frame counter.
980 */
981void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
982{
Jerome Glissee77cef92010-01-07 15:39:13 +0100983 /* vblank is not initialized (IRQ not installed ?) */
984 if (!dev->num_crtcs)
985 return;
Dave Airlief453ba02008-11-07 14:05:41 -0800986 /*
987 * To avoid all the problems that might happen if interrupts
988 * were enabled/disabled around or between these calls, we just
989 * have the kernel take a reference on the CRTC (just once though
990 * to avoid corrupting the count if multiple, mismatch calls occur),
991 * so that interrupts remain enabled in the interim.
992 */
993 if (!dev->vblank_inmodeset[crtc]) {
Chris Wilsonb3f5e732009-02-19 14:48:22 +0000994 dev->vblank_inmodeset[crtc] = 0x1;
995 if (drm_vblank_get(dev, crtc) == 0)
996 dev->vblank_inmodeset[crtc] |= 0x2;
Dave Airlief453ba02008-11-07 14:05:41 -0800997 }
998}
999EXPORT_SYMBOL(drm_vblank_pre_modeset);
1000
1001void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
1002{
1003 unsigned long irqflags;
1004
1005 if (dev->vblank_inmodeset[crtc]) {
1006 spin_lock_irqsave(&dev->vbl_lock, irqflags);
1007 dev->vblank_disable_allowed = 1;
Dave Airlief453ba02008-11-07 14:05:41 -08001008 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
Chris Wilsonb3f5e732009-02-19 14:48:22 +00001009
1010 if (dev->vblank_inmodeset[crtc] & 0x2)
1011 drm_vblank_put(dev, crtc);
1012
1013 dev->vblank_inmodeset[crtc] = 0;
Dave Airlief453ba02008-11-07 14:05:41 -08001014 }
1015}
1016EXPORT_SYMBOL(drm_vblank_post_modeset);
1017
1018/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001019 * drm_modeset_ctl - handle vblank event counter changes across mode switch
1020 * @DRM_IOCTL_ARGS: standard ioctl arguments
1021 *
1022 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
1023 * ioctls around modesetting so that any lost vblank events are accounted for.
1024 *
1025 * Generally the counter will reset across mode sets. If interrupts are
1026 * enabled around this call, we don't have to do anything since the counter
1027 * will have already been incremented.
1028 */
1029int drm_modeset_ctl(struct drm_device *dev, void *data,
1030 struct drm_file *file_priv)
1031{
1032 struct drm_modeset_ctl *modeset = data;
Dave Airlie19227562011-02-24 08:35:06 +10001033 unsigned int crtc;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001034
1035 /* If drm_vblank_init() hasn't been called yet, just no-op */
1036 if (!dev->num_crtcs)
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001037 return 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001038
Laurent Pinchart29935552012-05-30 00:58:09 +02001039 /* KMS drivers handle this internally */
1040 if (drm_core_check_feature(dev, DRIVER_MODESET))
1041 return 0;
1042
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001043 crtc = modeset->crtc;
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001044 if (crtc >= dev->num_crtcs)
1045 return -EINVAL;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001046
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001047 switch (modeset->cmd) {
1048 case _DRM_PRE_MODESET:
Dave Airlief453ba02008-11-07 14:05:41 -08001049 drm_vblank_pre_modeset(dev, crtc);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001050 break;
1051 case _DRM_POST_MODESET:
Dave Airlief453ba02008-11-07 14:05:41 -08001052 drm_vblank_post_modeset(dev, crtc);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001053 break;
1054 default:
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001055 return -EINVAL;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001056 }
1057
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001058 return 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001059}
1060
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001061static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
1062 union drm_wait_vblank *vblwait,
1063 struct drm_file *file_priv)
1064{
1065 struct drm_pending_vblank_event *e;
1066 struct timeval now;
1067 unsigned long flags;
1068 unsigned int seq;
Chris Wilsonea5d5522010-12-01 19:41:31 +00001069 int ret;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001070
1071 e = kzalloc(sizeof *e, GFP_KERNEL);
Chris Wilsonea5d5522010-12-01 19:41:31 +00001072 if (e == NULL) {
1073 ret = -ENOMEM;
1074 goto err_put;
1075 }
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001076
1077 e->pipe = pipe;
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001078 e->base.pid = current->pid;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001079 e->event.base.type = DRM_EVENT_VBLANK;
1080 e->event.base.length = sizeof e->event;
1081 e->event.user_data = vblwait->request.signal;
1082 e->base.event = &e->event.base;
1083 e->base.file_priv = file_priv;
1084 e->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
1085
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001086 spin_lock_irqsave(&dev->event_lock, flags);
1087
1088 if (file_priv->event_space < sizeof e->event) {
Chris Wilsonea5d5522010-12-01 19:41:31 +00001089 ret = -EBUSY;
1090 goto err_unlock;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001091 }
1092
1093 file_priv->event_space -= sizeof e->event;
Mario Kleiner27641c32010-10-23 04:20:23 +02001094 seq = drm_vblank_count_and_time(dev, pipe, &now);
1095
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001096 if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) &&
1097 (seq - vblwait->request.sequence) <= (1 << 23)) {
1098 vblwait->request.sequence = seq + 1;
Jesse Barnes4a921642009-11-10 08:21:25 +00001099 vblwait->reply.sequence = vblwait->request.sequence;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001100 }
1101
1102 DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n",
1103 vblwait->request.sequence, seq, pipe);
1104
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001105 trace_drm_vblank_event_queued(current->pid, pipe,
1106 vblwait->request.sequence);
1107
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001108 e->event.sequence = vblwait->request.sequence;
1109 if ((seq - vblwait->request.sequence) <= (1 << 23)) {
Mario Kleiner000fa7c2010-12-10 16:00:19 +01001110 e->event.sequence = seq;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001111 e->event.tv_sec = now.tv_sec;
1112 e->event.tv_usec = now.tv_usec;
Dan Carpenter6f331622010-12-09 08:35:40 +03001113 drm_vblank_put(dev, pipe);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001114 list_add_tail(&e->base.link, &e->base.file_priv->event_list);
1115 wake_up_interruptible(&e->base.file_priv->event_wait);
Mario Kleiner000fa7c2010-12-10 16:00:19 +01001116 vblwait->reply.sequence = seq;
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001117 trace_drm_vblank_event_delivered(current->pid, pipe,
1118 vblwait->request.sequence);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001119 } else {
Ilija Hadzica6778e92011-10-31 13:11:57 -04001120 /* drm_handle_vblank_events will call drm_vblank_put */
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001121 list_add_tail(&e->base.link, &dev->vblank_event_list);
Mario Kleiner000fa7c2010-12-10 16:00:19 +01001122 vblwait->reply.sequence = vblwait->request.sequence;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001123 }
1124
1125 spin_unlock_irqrestore(&dev->event_lock, flags);
1126
1127 return 0;
Chris Wilsonea5d5522010-12-01 19:41:31 +00001128
1129err_unlock:
1130 spin_unlock_irqrestore(&dev->event_lock, flags);
1131 kfree(e);
1132err_put:
Dan Carpenter6f331622010-12-09 08:35:40 +03001133 drm_vblank_put(dev, pipe);
Chris Wilsonea5d5522010-12-01 19:41:31 +00001134 return ret;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001135}
1136
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001137/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 * Wait for VBLANK.
1139 *
1140 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +10001141 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 * \param cmd command.
1143 * \param data user argument, pointing to a drm_wait_vblank structure.
1144 * \return zero on success or a negative number on failure.
1145 *
Eric Anholt30b23632009-01-27 21:19:41 -08001146 * This function enables the vblank interrupt on the pipe requested, then
1147 * sleeps waiting for the requested sequence number to occur, and drops
1148 * the vblank interrupt refcount afterwards. (vblank irq disable follows that
1149 * after a timeout with no further vblank waits scheduled).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001151int drm_wait_vblank(struct drm_device *dev, void *data,
1152 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153{
Eric Anholtc153f452007-09-03 12:06:45 +10001154 union drm_wait_vblank *vblwait = data;
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001155 int ret;
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001156 unsigned int flags, seq, crtc, high_crtc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
Jordan Crousedcdb1672010-05-27 13:40:25 -06001158 if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 return -EINVAL;
1160
Eric Anholt30b23632009-01-27 21:19:41 -08001161 if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
1162 return -EINVAL;
1163
Eric Anholtc153f452007-09-03 12:06:45 +10001164 if (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 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
Eric Anholtc153f452007-09-03 12:06:45 +10001168 vblwait->request.type,
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001169 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
1170 _DRM_VBLANK_HIGH_CRTC_MASK));
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001171 return -EINVAL;
1172 }
1173
Eric Anholtc153f452007-09-03 12:06:45 +10001174 flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001175 high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK);
1176 if (high_crtc)
1177 crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT;
1178 else
1179 crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001180 if (crtc >= dev->num_crtcs)
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001181 return -EINVAL;
1182
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001183 ret = drm_vblank_get(dev, crtc);
1184 if (ret) {
Paul Rolland8d3457e2009-08-09 12:24:01 +10001185 DRM_DEBUG("failed to acquire vblank counter, %d\n", ret);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001186 return ret;
1187 }
1188 seq = drm_vblank_count(dev, crtc);
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001189
Eric Anholtc153f452007-09-03 12:06:45 +10001190 switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 case _DRM_VBLANK_RELATIVE:
Eric Anholtc153f452007-09-03 12:06:45 +10001192 vblwait->request.sequence += seq;
1193 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 case _DRM_VBLANK_ABSOLUTE:
1195 break;
1196 default:
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001197 ret = -EINVAL;
1198 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 }
1200
Ilija Hadzica6778e92011-10-31 13:11:57 -04001201 if (flags & _DRM_VBLANK_EVENT) {
1202 /* must hold on to the vblank ref until the event fires
1203 * drm_vblank_put will be called asynchronously
1204 */
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001205 return drm_queue_vblank_event(dev, crtc, vblwait, file_priv);
Ilija Hadzica6778e92011-10-31 13:11:57 -04001206 }
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001207
=?utf-8?q?Michel_D=C3=A4nzer?=ab285d72006-10-24 23:34:18 +10001208 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
Eric Anholtc153f452007-09-03 12:06:45 +10001209 (seq - vblwait->request.sequence) <= (1<<23)) {
1210 vblwait->request.sequence = seq + 1;
=?utf-8?q?Michel_D=C3=A4nzer?=ab285d72006-10-24 23:34:18 +10001211 }
1212
Eric Anholt30b23632009-01-27 21:19:41 -08001213 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
1214 vblwait->request.sequence, crtc);
1215 dev->last_vblank_wait[crtc] = vblwait->request.sequence;
1216 DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
1217 (((drm_vblank_count(dev, crtc) -
1218 vblwait->request.sequence) <= (1 << 23)) ||
1219 !dev->irq_enabled));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220
Eric Anholt30b23632009-01-27 21:19:41 -08001221 if (ret != -EINTR) {
1222 struct timeval now;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223
Mario Kleiner27641c32010-10-23 04:20:23 +02001224 vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now);
Eric Anholt30b23632009-01-27 21:19:41 -08001225 vblwait->reply.tval_sec = now.tv_sec;
1226 vblwait->reply.tval_usec = now.tv_usec;
Mario Kleiner27641c32010-10-23 04:20:23 +02001227
Eric Anholt30b23632009-01-27 21:19:41 -08001228 DRM_DEBUG("returning %d to client\n",
1229 vblwait->reply.sequence);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 } else {
Eric Anholt30b23632009-01-27 21:19:41 -08001231 DRM_DEBUG("vblank wait interrupted by signal\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 }
1233
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001234done:
1235 drm_vblank_put(dev, crtc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 return ret;
1237}
1238
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001239void drm_handle_vblank_events(struct drm_device *dev, int crtc)
1240{
1241 struct drm_pending_vblank_event *e, *t;
1242 struct timeval now;
1243 unsigned long flags;
1244 unsigned int seq;
1245
Mario Kleiner27641c32010-10-23 04:20:23 +02001246 seq = drm_vblank_count_and_time(dev, crtc, &now);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001247
1248 spin_lock_irqsave(&dev->event_lock, flags);
1249
1250 list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
1251 if (e->pipe != crtc)
1252 continue;
1253 if ((seq - e->event.sequence) > (1<<23))
1254 continue;
1255
1256 DRM_DEBUG("vblank event on %d, current %d\n",
1257 e->event.sequence, seq);
1258
1259 e->event.sequence = seq;
1260 e->event.tv_sec = now.tv_sec;
1261 e->event.tv_usec = now.tv_usec;
1262 drm_vblank_put(dev, e->pipe);
1263 list_move_tail(&e->base.link, &e->base.file_priv->event_list);
1264 wake_up_interruptible(&e->base.file_priv->event_wait);
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001265 trace_drm_vblank_event_delivered(e->base.pid, e->pipe,
1266 e->event.sequence);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001267 }
1268
1269 spin_unlock_irqrestore(&dev->event_lock, flags);
Jesse Barnesac2874b2010-07-01 16:47:31 -07001270
1271 trace_drm_vblank_event(crtc, seq);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001272}
1273
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001275 * drm_handle_vblank - handle a vblank event
1276 * @dev: DRM device
1277 * @crtc: where this event occurred
1278 *
1279 * Drivers should call this routine in their vblank interrupt handlers to
1280 * update the vblank counter and send any signals that may be pending.
1281 */
Chris Wilson78c6e172011-01-31 10:48:04 +00001282bool drm_handle_vblank(struct drm_device *dev, int crtc)
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001283{
Mario Kleiner27641c32010-10-23 04:20:23 +02001284 u32 vblcount;
1285 s64 diff_ns;
1286 struct timeval tvblank;
1287 unsigned long irqflags;
1288
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001289 if (!dev->num_crtcs)
Chris Wilson78c6e172011-01-31 10:48:04 +00001290 return false;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001291
Mario Kleiner27641c32010-10-23 04:20:23 +02001292 /* Need timestamp lock to prevent concurrent execution with
1293 * vblank enable/disable, as this would cause inconsistent
1294 * or corrupted timestamps and vblank counts.
1295 */
1296 spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
1297
1298 /* Vblank irq handling disabled. Nothing to do. */
1299 if (!dev->vblank_enabled[crtc]) {
1300 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
Chris Wilson78c6e172011-01-31 10:48:04 +00001301 return false;
Mario Kleiner27641c32010-10-23 04:20:23 +02001302 }
1303
1304 /* Fetch corresponding timestamp for this vblank interval from
1305 * driver and store it in proper slot of timestamp ringbuffer.
1306 */
1307
1308 /* Get current timestamp and count. */
1309 vblcount = atomic_read(&dev->_vblank_count[crtc]);
1310 drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ);
1311
1312 /* Compute time difference to timestamp of last vblank */
1313 diff_ns = timeval_to_ns(&tvblank) -
1314 timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
1315
1316 /* Update vblank timestamp and count if at least
1317 * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds
1318 * difference between last stored timestamp and current
1319 * timestamp. A smaller difference means basically
1320 * identical timestamps. Happens if this vblank has
1321 * been already processed and this is a redundant call,
1322 * e.g., due to spurious vblank interrupts. We need to
1323 * ignore those for accounting.
1324 */
Mario Kleinerc4cc3832011-02-21 05:42:00 +01001325 if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) {
Mario Kleiner27641c32010-10-23 04:20:23 +02001326 /* Store new timestamp in ringbuffer. */
1327 vblanktimestamp(dev, crtc, vblcount + 1) = tvblank;
Mario Kleiner27641c32010-10-23 04:20:23 +02001328
1329 /* Increment cooked vblank count. This also atomically commits
1330 * the timestamp computed above.
1331 */
Mario Kleinerbc215122011-02-21 05:42:01 +01001332 smp_mb__before_atomic_inc();
Mario Kleiner27641c32010-10-23 04:20:23 +02001333 atomic_inc(&dev->_vblank_count[crtc]);
Mario Kleinerbc215122011-02-21 05:42:01 +01001334 smp_mb__after_atomic_inc();
Mario Kleiner27641c32010-10-23 04:20:23 +02001335 } else {
1336 DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n",
1337 crtc, (int) diff_ns);
1338 }
1339
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001340 DRM_WAKEUP(&dev->vbl_queue[crtc]);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001341 drm_handle_vblank_events(dev, crtc);
Mario Kleiner27641c32010-10-23 04:20:23 +02001342
1343 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
Chris Wilson78c6e172011-01-31 10:48:04 +00001344 return true;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001345}
1346EXPORT_SYMBOL(drm_handle_vblank);