blob: a6a8643a6a77b112518e363cb656800e44a6513d [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
David Howells760285e2012-10-02 18:01:07 +010036#include <drm/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;
Egbert Eich0355cf32012-10-13 11:36:14 +0000109 int count = DRM_TIMESTAMP_MAXRETRIES;
Mario Kleiner27641c32010-10-23 04:20:23 +0200110
111 /* Prevent vblank irq processing while disabling vblank irqs,
112 * so no updates of timestamps or count can happen after we've
113 * disabled. Needed to prevent races in case of delayed irq's.
Mario Kleiner27641c32010-10-23 04:20:23 +0200114 */
Mario Kleiner27641c32010-10-23 04:20:23 +0200115 spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
116
117 dev->driver->disable_vblank(dev, crtc);
118 dev->vblank_enabled[crtc] = 0;
119
120 /* No further vblank irq's will be processed after
121 * this point. Get current hardware vblank count and
122 * vblank timestamp, repeat until they are consistent.
123 *
124 * FIXME: There is still a race condition here and in
125 * drm_update_vblank_count() which can cause off-by-one
126 * reinitialization of software vblank counter. If gpu
127 * vblank counter doesn't increment exactly at the leading
128 * edge of a vblank interval, then we can lose 1 count if
129 * we happen to execute between start of vblank and the
130 * delayed gpu counter increment.
131 */
132 do {
133 dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc);
134 vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0);
Egbert Eich0355cf32012-10-13 11:36:14 +0000135 } while (dev->last_vblank[crtc] != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc);
136
137 if (!count)
138 vblrc = 0;
Mario Kleiner27641c32010-10-23 04:20:23 +0200139
140 /* Compute time difference to stored timestamp of last vblank
141 * as updated by last invocation of drm_handle_vblank() in vblank irq.
142 */
143 vblcount = atomic_read(&dev->_vblank_count[crtc]);
144 diff_ns = timeval_to_ns(&tvblank) -
145 timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
146
147 /* If there is at least 1 msec difference between the last stored
148 * timestamp and tvblank, then we are currently executing our
149 * disable inside a new vblank interval, the tvblank timestamp
150 * corresponds to this new vblank interval and the irq handler
151 * for this vblank didn't run yet and won't run due to our disable.
152 * Therefore we need to do the job of drm_handle_vblank() and
153 * increment the vblank counter by one to account for this vblank.
154 *
155 * Skip this step if there isn't any high precision timestamp
156 * available. In that case we can't account for this and just
157 * hope for the best.
158 */
Mario Kleinerbc215122011-02-21 05:42:01 +0100159 if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) {
Mario Kleiner27641c32010-10-23 04:20:23 +0200160 atomic_inc(&dev->_vblank_count[crtc]);
Mario Kleinerbc215122011-02-21 05:42:01 +0100161 smp_mb__after_atomic_inc();
162 }
Mario Kleiner27641c32010-10-23 04:20:23 +0200163
164 /* Invalidate all timestamps while vblank irq's are off. */
165 clear_vblank_timestamps(dev, crtc);
166
167 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
Mario Kleiner27641c32010-10-23 04:20:23 +0200168}
169
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700170static void vblank_disable_fn(unsigned long arg)
171{
172 struct drm_device *dev = (struct drm_device *)arg;
173 unsigned long irqflags;
174 int i;
175
176 if (!dev->vblank_disable_allowed)
177 return;
178
179 for (i = 0; i < dev->num_crtcs; i++) {
180 spin_lock_irqsave(&dev->vbl_lock, irqflags);
181 if (atomic_read(&dev->vblank_refcount[i]) == 0 &&
182 dev->vblank_enabled[i]) {
183 DRM_DEBUG("disabling vblank on crtc %d\n", i);
Mario Kleiner27641c32010-10-23 04:20:23 +0200184 vblank_disable_and_save(dev, i);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700185 }
186 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
187 }
188}
189
Keith Packard52440212008-11-18 09:30:25 -0800190void drm_vblank_cleanup(struct drm_device *dev)
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700191{
192 /* Bail if the driver didn't call drm_vblank_init() */
193 if (dev->num_crtcs == 0)
194 return;
195
Laurent Pinchart7eb3b2c2012-05-17 13:27:19 +0200196 del_timer_sync(&dev->vblank_disable_timer);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700197
198 vblank_disable_fn((unsigned long)dev);
199
Eric Anholt9a298b22009-03-24 12:23:04 -0700200 kfree(dev->vbl_queue);
201 kfree(dev->_vblank_count);
202 kfree(dev->vblank_refcount);
203 kfree(dev->vblank_enabled);
204 kfree(dev->last_vblank);
205 kfree(dev->last_vblank_wait);
206 kfree(dev->vblank_inmodeset);
Mario Kleiner27641c32010-10-23 04:20:23 +0200207 kfree(dev->_vblank_time);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700208
209 dev->num_crtcs = 0;
210}
Jerome Glissee77cef92010-01-07 15:39:13 +0100211EXPORT_SYMBOL(drm_vblank_cleanup);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700212
213int drm_vblank_init(struct drm_device *dev, int num_crtcs)
214{
215 int i, ret = -ENOMEM;
216
217 setup_timer(&dev->vblank_disable_timer, vblank_disable_fn,
218 (unsigned long)dev);
219 spin_lock_init(&dev->vbl_lock);
Mario Kleiner27641c32010-10-23 04:20:23 +0200220 spin_lock_init(&dev->vblank_time_lock);
221
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700222 dev->num_crtcs = num_crtcs;
223
Eric Anholt9a298b22009-03-24 12:23:04 -0700224 dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs,
225 GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700226 if (!dev->vbl_queue)
227 goto err;
228
Eric Anholt9a298b22009-03-24 12:23:04 -0700229 dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700230 if (!dev->_vblank_count)
231 goto err;
232
Eric Anholt9a298b22009-03-24 12:23:04 -0700233 dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs,
234 GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700235 if (!dev->vblank_refcount)
236 goto err;
237
Eric Anholt9a298b22009-03-24 12:23:04 -0700238 dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700239 if (!dev->vblank_enabled)
240 goto err;
241
Eric Anholt9a298b22009-03-24 12:23:04 -0700242 dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700243 if (!dev->last_vblank)
244 goto err;
245
Eric Anholt9a298b22009-03-24 12:23:04 -0700246 dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
Eric Anholtfede5c92008-12-19 17:23:38 -0800247 if (!dev->last_vblank_wait)
248 goto err;
249
Eric Anholt9a298b22009-03-24 12:23:04 -0700250 dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700251 if (!dev->vblank_inmodeset)
252 goto err;
253
Mario Kleiner27641c32010-10-23 04:20:23 +0200254 dev->_vblank_time = kcalloc(num_crtcs * DRM_VBLANKTIME_RBSIZE,
255 sizeof(struct timeval), GFP_KERNEL);
256 if (!dev->_vblank_time)
257 goto err;
258
259 DRM_INFO("Supports vblank timestamp caching Rev 1 (10.10.2010).\n");
260
261 /* Driver specific high-precision vblank timestamping supported? */
262 if (dev->driver->get_vblank_timestamp)
263 DRM_INFO("Driver supports precise vblank timestamp query.\n");
264 else
265 DRM_INFO("No driver support for vblank timestamp query.\n");
266
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700267 /* Zero per-crtc vblank stuff */
268 for (i = 0; i < num_crtcs; i++) {
269 init_waitqueue_head(&dev->vbl_queue[i]);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700270 atomic_set(&dev->_vblank_count[i], 0);
271 atomic_set(&dev->vblank_refcount[i], 0);
272 }
273
274 dev->vblank_disable_allowed = 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700275 return 0;
276
277err:
278 drm_vblank_cleanup(dev);
279 return ret;
280}
281EXPORT_SYMBOL(drm_vblank_init);
282
Dave Airlie28d52042009-09-21 14:33:58 +1000283static void drm_irq_vgaarb_nokms(void *cookie, bool state)
284{
285 struct drm_device *dev = cookie;
286
287 if (dev->driver->vgaarb_irq) {
288 dev->driver->vgaarb_irq(dev, state);
289 return;
290 }
291
292 if (!dev->irq_enabled)
293 return;
294
Joonyoung Shim5037f8a2011-08-04 05:41:01 +0000295 if (state) {
296 if (dev->driver->irq_uninstall)
297 dev->driver->irq_uninstall(dev);
298 } else {
299 if (dev->driver->irq_preinstall)
300 dev->driver->irq_preinstall(dev);
301 if (dev->driver->irq_postinstall)
302 dev->driver->irq_postinstall(dev);
Dave Airlie28d52042009-09-21 14:33:58 +1000303 }
304}
305
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306/**
307 * Install IRQ handler.
308 *
309 * \param dev DRM device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 *
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700311 * Initializes the IRQ related data. Installs the handler, calling the driver
Sascha Hauer884a53e2012-02-29 09:06:21 +0100312 * \c irq_preinstall() and \c irq_postinstall() functions
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 * before and after the installation.
314 */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700315int drm_irq_install(struct drm_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
Laurent Pinchart4a1b0712012-05-17 13:27:21 +0200317 int ret;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000318 unsigned long sh_flags = 0;
Dave Airlieb8da7de2009-06-02 16:50:35 +1000319 char *irqname;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
321 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
322 return -EINVAL;
323
Jordan Crousedcdb1672010-05-27 13:40:25 -0600324 if (drm_dev_to_irq(dev) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 return -EINVAL;
326
Dave Airlie30e2fb12006-02-02 19:37:46 +1100327 mutex_lock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
329 /* Driver must have been initialized */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000330 if (!dev->dev_private) {
Dave Airlie30e2fb12006-02-02 19:37:46 +1100331 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 return -EINVAL;
333 }
334
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000335 if (dev->irq_enabled) {
Dave Airlie30e2fb12006-02-02 19:37:46 +1100336 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 return -EBUSY;
338 }
339 dev->irq_enabled = 1;
Dave Airlie30e2fb12006-02-02 19:37:46 +1100340 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
Jordan Crousedcdb1672010-05-27 13:40:25 -0600342 DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000344 /* Before installing handler */
Joonyoung Shim5037f8a2011-08-04 05:41:01 +0000345 if (dev->driver->irq_preinstall)
346 dev->driver->irq_preinstall(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000348 /* Install handler */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
Thomas Gleixner935f6e32006-07-01 19:29:34 -0700350 sh_flags = IRQF_SHARED;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000351
Dave Airlieb8da7de2009-06-02 16:50:35 +1000352 if (dev->devname)
353 irqname = dev->devname;
354 else
355 irqname = dev->driver->name;
356
Jesse Barnes9bfbd5c2008-09-15 15:00:33 -0700357 ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler,
Dave Airlieb8da7de2009-06-02 16:50:35 +1000358 sh_flags, irqname, dev);
Jesse Barnes9bfbd5c2008-09-15 15:00:33 -0700359
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000360 if (ret < 0) {
Dave Airlie30e2fb12006-02-02 19:37:46 +1100361 mutex_lock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 dev->irq_enabled = 0;
Dave Airlie30e2fb12006-02-02 19:37:46 +1100363 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 return ret;
365 }
366
Dave Airlie28d52042009-09-21 14:33:58 +1000367 if (!drm_core_check_feature(dev, DRIVER_MODESET))
368 vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL);
369
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000370 /* After installing handler */
Joonyoung Shim5037f8a2011-08-04 05:41:01 +0000371 if (dev->driver->irq_postinstall)
372 ret = dev->driver->irq_postinstall(dev);
373
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700374 if (ret < 0) {
375 mutex_lock(&dev->struct_mutex);
376 dev->irq_enabled = 0;
377 mutex_unlock(&dev->struct_mutex);
Joonyoung Shime1c44ac2011-08-04 05:41:00 +0000378 if (!drm_core_check_feature(dev, DRIVER_MODESET))
379 vga_client_register(dev->pdev, NULL, NULL, NULL);
380 free_irq(drm_dev_to_irq(dev), dev);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700381 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700383 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384}
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700385EXPORT_SYMBOL(drm_irq_install);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
387/**
388 * Uninstall the IRQ handler.
389 *
390 * \param dev DRM device.
391 *
Sascha Hauer884a53e2012-02-29 09:06:21 +0100392 * Calls the driver's \c irq_uninstall() function, and stops the irq.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 */
Mario Kleiner27641c32010-10-23 04:20:23 +0200394int drm_irq_uninstall(struct drm_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395{
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800396 unsigned long irqflags;
397 int irq_enabled, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
399 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
400 return -EINVAL;
401
Dave Airlie30e2fb12006-02-02 19:37:46 +1100402 mutex_lock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 irq_enabled = dev->irq_enabled;
404 dev->irq_enabled = 0;
Dave Airlie30e2fb12006-02-02 19:37:46 +1100405 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800407 /*
408 * Wake up any waiters so they don't hang.
409 */
Ben Skeggsbde48892011-07-04 12:52:27 +1000410 if (dev->num_crtcs) {
411 spin_lock_irqsave(&dev->vbl_lock, irqflags);
412 for (i = 0; i < dev->num_crtcs; i++) {
413 DRM_WAKEUP(&dev->vbl_queue[i]);
414 dev->vblank_enabled[i] = 0;
415 dev->last_vblank[i] =
416 dev->driver->get_vblank_counter(dev, i);
417 }
418 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800419 }
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800420
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000421 if (!irq_enabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 return -EINVAL;
423
Jordan Crousedcdb1672010-05-27 13:40:25 -0600424 DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Dave Airlie28d52042009-09-21 14:33:58 +1000426 if (!drm_core_check_feature(dev, DRIVER_MODESET))
427 vga_client_register(dev->pdev, NULL, NULL, NULL);
428
Joonyoung Shim5037f8a2011-08-04 05:41:01 +0000429 if (dev->driver->irq_uninstall)
430 dev->driver->irq_uninstall(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
Jordan Crousedcdb1672010-05-27 13:40:25 -0600432 free_irq(drm_dev_to_irq(dev), dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434 return 0;
435}
436EXPORT_SYMBOL(drm_irq_uninstall);
437
438/**
439 * IRQ control ioctl.
440 *
441 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +1000442 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 * \param cmd command.
444 * \param arg user argument, pointing to a drm_control structure.
445 * \return zero on success or a negative number on failure.
446 *
447 * Calls irq_install() or irq_uninstall() according to \p arg.
448 */
Eric Anholtc153f452007-09-03 12:06:45 +1000449int drm_control(struct drm_device *dev, void *data,
450 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451{
Eric Anholtc153f452007-09-03 12:06:45 +1000452 struct drm_control *ctl = data;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000453
Mario Kleiner27641c32010-10-23 04:20:23 +0200454 /* if we haven't irq we fallback for compatibility reasons -
455 * this used to be a separate function in drm_dma.h
456 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
Eric Anholtc153f452007-09-03 12:06:45 +1000459 switch (ctl->func) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 case DRM_INST_HANDLER:
461 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
462 return 0;
Dave Airlief453ba02008-11-07 14:05:41 -0800463 if (drm_core_check_feature(dev, DRIVER_MODESET))
464 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
Jordan Crousedcdb1672010-05-27 13:40:25 -0600466 ctl->irq != drm_dev_to_irq(dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 return -EINVAL;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000468 return drm_irq_install(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 case DRM_UNINST_HANDLER:
470 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
471 return 0;
Dave Airlief453ba02008-11-07 14:05:41 -0800472 if (drm_core_check_feature(dev, DRIVER_MODESET))
473 return 0;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000474 return drm_irq_uninstall(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 default:
476 return -EINVAL;
477 }
478}
479
480/**
Mario Kleiner27641c32010-10-23 04:20:23 +0200481 * drm_calc_timestamping_constants - Calculate and
482 * store various constants which are later needed by
483 * vblank and swap-completion timestamping, e.g, by
484 * drm_calc_vbltimestamp_from_scanoutpos().
485 * They are derived from crtc's true scanout timing,
486 * so they take things like panel scaling or other
487 * adjustments into account.
488 *
489 * @crtc drm_crtc whose timestamp constants should be updated.
490 *
491 */
492void drm_calc_timestamping_constants(struct drm_crtc *crtc)
493{
494 s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0;
495 u64 dotclock;
496
497 /* Dot clock in Hz: */
498 dotclock = (u64) crtc->hwmode.clock * 1000;
499
Mario Kleiner9be6f8a2011-02-21 05:42:02 +0100500 /* Fields of interlaced scanout modes are only halve a frame duration.
501 * Double the dotclock to get halve the frame-/line-/pixelduration.
502 */
503 if (crtc->hwmode.flags & DRM_MODE_FLAG_INTERLACE)
504 dotclock *= 2;
505
Mario Kleiner27641c32010-10-23 04:20:23 +0200506 /* Valid dotclock? */
507 if (dotclock > 0) {
Daniel Kurtz85a7ce62012-12-27 01:01:46 +0000508 int frame_size;
Mario Kleiner27641c32010-10-23 04:20:23 +0200509 /* Convert scanline length in pixels and video dot clock to
510 * line duration, frame duration and pixel duration in
511 * nanoseconds:
512 */
513 pixeldur_ns = (s64) div64_u64(1000000000, dotclock);
514 linedur_ns = (s64) div64_u64(((u64) crtc->hwmode.crtc_htotal *
515 1000000000), dotclock);
Daniel Kurtz85a7ce62012-12-27 01:01:46 +0000516 frame_size = crtc->hwmode.crtc_htotal *
517 crtc->hwmode.crtc_vtotal;
518 framedur_ns = (s64) div64_u64((u64) frame_size * 1000000000,
519 dotclock);
Mario Kleiner27641c32010-10-23 04:20:23 +0200520 } else
521 DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n",
522 crtc->base.id);
523
524 crtc->pixeldur_ns = pixeldur_ns;
525 crtc->linedur_ns = linedur_ns;
526 crtc->framedur_ns = framedur_ns;
527
528 DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n",
529 crtc->base.id, crtc->hwmode.crtc_htotal,
530 crtc->hwmode.crtc_vtotal, crtc->hwmode.crtc_vdisplay);
531 DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n",
532 crtc->base.id, (int) dotclock/1000, (int) framedur_ns,
533 (int) linedur_ns, (int) pixeldur_ns);
534}
535EXPORT_SYMBOL(drm_calc_timestamping_constants);
536
537/**
538 * drm_calc_vbltimestamp_from_scanoutpos - helper routine for kms
539 * drivers. Implements calculation of exact vblank timestamps from
540 * given drm_display_mode timings and current video scanout position
541 * of a crtc. This can be called from within get_vblank_timestamp()
542 * implementation of a kms driver to implement the actual timestamping.
543 *
544 * Should return timestamps conforming to the OML_sync_control OpenML
545 * extension specification. The timestamp corresponds to the end of
546 * the vblank interval, aka start of scanout of topmost-leftmost display
547 * pixel in the following video frame.
548 *
549 * Requires support for optional dev->driver->get_scanout_position()
550 * in kms driver, plus a bit of setup code to provide a drm_display_mode
551 * that corresponds to the true scanout timing.
552 *
553 * The current implementation only handles standard video modes. It
554 * returns as no operation if a doublescan or interlaced video mode is
555 * active. Higher level code is expected to handle this.
556 *
557 * @dev: DRM device.
558 * @crtc: Which crtc's vblank timestamp to retrieve.
559 * @max_error: Desired maximum allowable error in timestamps (nanosecs).
560 * On return contains true maximum error of timestamp.
561 * @vblank_time: Pointer to struct timeval which should receive the timestamp.
562 * @flags: Flags to pass to driver:
563 * 0 = Default.
564 * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler.
565 * @refcrtc: drm_crtc* of crtc which defines scanout timing.
566 *
567 * Returns negative value on error, failure or if not supported in current
568 * video mode:
569 *
570 * -EINVAL - Invalid crtc.
571 * -EAGAIN - Temporary unavailable, e.g., called before initial modeset.
572 * -ENOTSUPP - Function not supported in current display mode.
573 * -EIO - Failed, e.g., due to failed scanout position query.
574 *
575 * Returns or'ed positive status flags on success:
576 *
577 * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.
578 * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.
579 *
580 */
581int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
582 int *max_error,
583 struct timeval *vblank_time,
584 unsigned flags,
585 struct drm_crtc *refcrtc)
586{
Imre Deake62f2f52012-10-23 18:53:25 +0000587 ktime_t stime, etime, mono_time_offset;
588 struct timeval tv_etime;
Mario Kleiner27641c32010-10-23 04:20:23 +0200589 struct drm_display_mode *mode;
590 int vbl_status, vtotal, vdisplay;
591 int vpos, hpos, i;
592 s64 framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns;
593 bool invbl;
594
595 if (crtc < 0 || crtc >= dev->num_crtcs) {
596 DRM_ERROR("Invalid crtc %d\n", crtc);
597 return -EINVAL;
598 }
599
600 /* Scanout position query not supported? Should not happen. */
601 if (!dev->driver->get_scanout_position) {
602 DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
603 return -EIO;
604 }
605
606 mode = &refcrtc->hwmode;
607 vtotal = mode->crtc_vtotal;
608 vdisplay = mode->crtc_vdisplay;
609
610 /* Durations of frames, lines, pixels in nanoseconds. */
611 framedur_ns = refcrtc->framedur_ns;
612 linedur_ns = refcrtc->linedur_ns;
613 pixeldur_ns = refcrtc->pixeldur_ns;
614
615 /* If mode timing undefined, just return as no-op:
616 * Happens during initial modesetting of a crtc.
617 */
618 if (vtotal <= 0 || vdisplay <= 0 || framedur_ns == 0) {
619 DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc);
620 return -EAGAIN;
621 }
622
Mario Kleiner27641c32010-10-23 04:20:23 +0200623 /* Get current scanout position with system timestamp.
624 * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times
625 * if single query takes longer than max_error nanoseconds.
626 *
627 * This guarantees a tight bound on maximum error if
628 * code gets preempted or delayed for some reason.
629 */
630 for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) {
631 /* Disable preemption to make it very likely to
632 * succeed in the first iteration even on PREEMPT_RT kernel.
633 */
634 preempt_disable();
635
636 /* Get system timestamp before query. */
Imre Deake62f2f52012-10-23 18:53:25 +0000637 stime = ktime_get();
Mario Kleiner27641c32010-10-23 04:20:23 +0200638
639 /* Get vertical and horizontal scanout pos. vpos, hpos. */
640 vbl_status = dev->driver->get_scanout_position(dev, crtc, &vpos, &hpos);
641
642 /* Get system timestamp after query. */
Imre Deake62f2f52012-10-23 18:53:25 +0000643 etime = ktime_get();
Imre Deakc61eef72012-10-23 18:53:26 +0000644 if (!drm_timestamp_monotonic)
645 mono_time_offset = ktime_get_monotonic_offset();
Mario Kleiner27641c32010-10-23 04:20:23 +0200646
647 preempt_enable();
648
649 /* Return as no-op if scanout query unsupported or failed. */
650 if (!(vbl_status & DRM_SCANOUTPOS_VALID)) {
651 DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n",
652 crtc, vbl_status);
653 return -EIO;
654 }
655
Imre Deake62f2f52012-10-23 18:53:25 +0000656 duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime);
Mario Kleiner27641c32010-10-23 04:20:23 +0200657
658 /* Accept result with < max_error nsecs timing uncertainty. */
659 if (duration_ns <= (s64) *max_error)
660 break;
661 }
662
663 /* Noisy system timing? */
664 if (i == DRM_TIMESTAMP_MAXRETRIES) {
665 DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n",
666 crtc, (int) duration_ns/1000, *max_error/1000, i);
667 }
668
669 /* Return upper bound of timestamp precision error. */
670 *max_error = (int) duration_ns;
671
672 /* Check if in vblank area:
673 * vpos is >=0 in video scanout area, but negative
674 * within vblank area, counting down the number of lines until
675 * start of scanout.
676 */
677 invbl = vbl_status & DRM_SCANOUTPOS_INVBL;
678
679 /* Convert scanout position into elapsed time at raw_time query
680 * since start of scanout at first display scanline. delta_ns
681 * can be negative if start of scanout hasn't happened yet.
682 */
683 delta_ns = (s64) vpos * linedur_ns + (s64) hpos * pixeldur_ns;
684
685 /* Is vpos outside nominal vblank area, but less than
686 * 1/100 of a frame height away from start of vblank?
687 * If so, assume this isn't a massively delayed vblank
688 * interrupt, but a vblank interrupt that fired a few
689 * microseconds before true start of vblank. Compensate
690 * by adding a full frame duration to the final timestamp.
691 * Happens, e.g., on ATI R500, R600.
692 *
693 * We only do this if DRM_CALLED_FROM_VBLIRQ.
694 */
695 if ((flags & DRM_CALLED_FROM_VBLIRQ) && !invbl &&
696 ((vdisplay - vpos) < vtotal / 100)) {
697 delta_ns = delta_ns - framedur_ns;
698
699 /* Signal this correction as "applied". */
700 vbl_status |= 0x8;
701 }
702
Imre Deakc61eef72012-10-23 18:53:26 +0000703 if (!drm_timestamp_monotonic)
704 etime = ktime_sub(etime, mono_time_offset);
705
Imre Deake62f2f52012-10-23 18:53:25 +0000706 /* save this only for debugging purposes */
707 tv_etime = ktime_to_timeval(etime);
Mario Kleiner27641c32010-10-23 04:20:23 +0200708 /* Subtract time delta from raw timestamp to get final
709 * vblank_time timestamp for end of vblank.
710 */
Imre Deake62f2f52012-10-23 18:53:25 +0000711 etime = ktime_sub_ns(etime, delta_ns);
712 *vblank_time = ktime_to_timeval(etime);
Mario Kleiner27641c32010-10-23 04:20:23 +0200713
Joe Perchesbbb0aef2011-04-17 20:35:52 -0700714 DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",
715 crtc, (int)vbl_status, hpos, vpos,
Imre Deake62f2f52012-10-23 18:53:25 +0000716 (long)tv_etime.tv_sec, (long)tv_etime.tv_usec,
Joe Perchesbbb0aef2011-04-17 20:35:52 -0700717 (long)vblank_time->tv_sec, (long)vblank_time->tv_usec,
718 (int)duration_ns/1000, i);
Mario Kleiner27641c32010-10-23 04:20:23 +0200719
720 vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD;
721 if (invbl)
722 vbl_status |= DRM_VBLANKTIME_INVBL;
723
724 return vbl_status;
725}
726EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
727
Imre Deakc61eef72012-10-23 18:53:26 +0000728static struct timeval get_drm_timestamp(void)
729{
730 ktime_t now;
731
732 now = ktime_get();
733 if (!drm_timestamp_monotonic)
734 now = ktime_sub(now, ktime_get_monotonic_offset());
735
736 return ktime_to_timeval(now);
737}
738
Mario Kleiner27641c32010-10-23 04:20:23 +0200739/**
740 * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent
741 * vblank interval.
742 *
743 * @dev: DRM device
744 * @crtc: which crtc's vblank timestamp to retrieve
745 * @tvblank: Pointer to target struct timeval which should receive the timestamp
746 * @flags: Flags to pass to driver:
747 * 0 = Default.
748 * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler.
749 *
750 * Fetches the system timestamp corresponding to the time of the most recent
751 * vblank interval on specified crtc. May call into kms-driver to
752 * compute the timestamp with a high-precision GPU specific method.
753 *
754 * Returns zero if timestamp originates from uncorrected do_gettimeofday()
755 * call, i.e., it isn't very precisely locked to the true vblank.
756 *
757 * Returns non-zero if timestamp is considered to be very precise.
758 */
759u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
760 struct timeval *tvblank, unsigned flags)
761{
Laurent Pinchart4a1b0712012-05-17 13:27:21 +0200762 int ret;
Mario Kleiner27641c32010-10-23 04:20:23 +0200763
764 /* Define requested maximum error on timestamps (nanoseconds). */
765 int max_error = (int) drm_timestamp_precision * 1000;
766
767 /* Query driver if possible and precision timestamping enabled. */
768 if (dev->driver->get_vblank_timestamp && (max_error > 0)) {
769 ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error,
770 tvblank, flags);
771 if (ret > 0)
772 return (u32) ret;
773 }
774
775 /* GPU high precision timestamp query unsupported or failed.
Imre Deakc61eef72012-10-23 18:53:26 +0000776 * Return current monotonic/gettimeofday timestamp as best estimate.
Mario Kleiner27641c32010-10-23 04:20:23 +0200777 */
Imre Deakc61eef72012-10-23 18:53:26 +0000778 *tvblank = get_drm_timestamp();
Mario Kleiner27641c32010-10-23 04:20:23 +0200779
780 return 0;
781}
782EXPORT_SYMBOL(drm_get_last_vbltimestamp);
783
784/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700785 * drm_vblank_count - retrieve "cooked" vblank counter value
786 * @dev: DRM device
787 * @crtc: which counter to retrieve
788 *
789 * Fetches the "cooked" vblank count value that represents the number of
790 * vblank events since the system was booted, including lost events due to
791 * modesetting activity.
792 */
793u32 drm_vblank_count(struct drm_device *dev, int crtc)
794{
795 return atomic_read(&dev->_vblank_count[crtc]);
796}
797EXPORT_SYMBOL(drm_vblank_count);
798
799/**
Mario Kleiner27641c32010-10-23 04:20:23 +0200800 * drm_vblank_count_and_time - retrieve "cooked" vblank counter value
801 * and the system timestamp corresponding to that vblank counter value.
802 *
803 * @dev: DRM device
804 * @crtc: which counter to retrieve
805 * @vblanktime: Pointer to struct timeval to receive the vblank timestamp.
806 *
807 * Fetches the "cooked" vblank count value that represents the number of
808 * vblank events since the system was booted, including lost events due to
809 * modesetting activity. Returns corresponding system timestamp of the time
810 * of the vblank interval that corresponds to the current value vblank counter
811 * value.
812 */
813u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc,
814 struct timeval *vblanktime)
815{
816 u32 cur_vblank;
817
818 /* Read timestamp from slot of _vblank_time ringbuffer
819 * that corresponds to current vblank count. Retry if
820 * count has incremented during readout. This works like
821 * a seqlock.
822 */
823 do {
824 cur_vblank = atomic_read(&dev->_vblank_count[crtc]);
825 *vblanktime = vblanktimestamp(dev, crtc, cur_vblank);
826 smp_rmb();
827 } while (cur_vblank != atomic_read(&dev->_vblank_count[crtc]));
828
829 return cur_vblank;
830}
831EXPORT_SYMBOL(drm_vblank_count_and_time);
832
Rob Clarkc6eefa12012-10-16 22:48:40 +0000833static void send_vblank_event(struct drm_device *dev,
834 struct drm_pending_vblank_event *e,
835 unsigned long seq, struct timeval *now)
836{
837 WARN_ON_SMP(!spin_is_locked(&dev->event_lock));
838 e->event.sequence = seq;
839 e->event.tv_sec = now->tv_sec;
840 e->event.tv_usec = now->tv_usec;
841
842 list_add_tail(&e->base.link,
843 &e->base.file_priv->event_list);
844 wake_up_interruptible(&e->base.file_priv->event_wait);
845 trace_drm_vblank_event_delivered(e->base.pid, e->pipe,
846 e->event.sequence);
847}
848
849/**
850 * drm_send_vblank_event - helper to send vblank event after pageflip
851 * @dev: DRM device
852 * @crtc: CRTC in question
853 * @e: the event to send
854 *
855 * Updates sequence # and timestamp on event, and sends it to userspace.
856 * Caller must hold event lock.
857 */
858void drm_send_vblank_event(struct drm_device *dev, int crtc,
859 struct drm_pending_vblank_event *e)
860{
861 struct timeval now;
862 unsigned int seq;
863 if (crtc >= 0) {
864 seq = drm_vblank_count_and_time(dev, crtc, &now);
865 } else {
866 seq = 0;
Imre Deakc61eef72012-10-23 18:53:26 +0000867
868 now = get_drm_timestamp();
Rob Clarkc6eefa12012-10-16 22:48:40 +0000869 }
Rob Clark21a245d2012-12-10 10:49:46 -0600870 e->pipe = crtc;
Rob Clarkc6eefa12012-10-16 22:48:40 +0000871 send_vblank_event(dev, e, seq, &now);
872}
873EXPORT_SYMBOL(drm_send_vblank_event);
874
Mario Kleiner27641c32010-10-23 04:20:23 +0200875/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700876 * drm_update_vblank_count - update the master vblank counter
877 * @dev: DRM device
878 * @crtc: counter to update
879 *
880 * Call back into the driver to update the appropriate vblank counter
881 * (specified by @crtc). Deal with wraparound, if it occurred, and
882 * update the last read value so we can deal with wraparound on the next
883 * call if necessary.
884 *
885 * Only necessary when going from off->on, to account for frames we
886 * didn't get an interrupt for.
887 *
888 * Note: caller must hold dev->vbl_lock since this reads & writes
889 * device vblank fields.
890 */
891static void drm_update_vblank_count(struct drm_device *dev, int crtc)
892{
Mario Kleiner27641c32010-10-23 04:20:23 +0200893 u32 cur_vblank, diff, tslot, rc;
894 struct timeval t_vblank;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700895
896 /*
897 * Interrupts were disabled prior to this call, so deal with counter
898 * wrap if needed.
899 * NOTE! It's possible we lost a full dev->max_vblank_count events
900 * here if the register is small or we had vblank interrupts off for
901 * a long time.
Mario Kleiner27641c32010-10-23 04:20:23 +0200902 *
903 * We repeat the hardware vblank counter & timestamp query until
904 * we get consistent results. This to prevent races between gpu
905 * updating its hardware counter while we are retrieving the
906 * corresponding vblank timestamp.
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700907 */
Mario Kleiner27641c32010-10-23 04:20:23 +0200908 do {
909 cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
910 rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0);
911 } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc));
912
913 /* Deal with counter wrap */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700914 diff = cur_vblank - dev->last_vblank[crtc];
915 if (cur_vblank < dev->last_vblank[crtc]) {
916 diff += dev->max_vblank_count;
917
918 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
919 crtc, dev->last_vblank[crtc], cur_vblank, diff);
920 }
921
922 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
923 crtc, diff);
924
Mario Kleiner27641c32010-10-23 04:20:23 +0200925 /* Reinitialize corresponding vblank timestamp if high-precision query
926 * available. Skip this step if query unsupported or failed. Will
927 * reinitialize delayed at next vblank interrupt in that case.
928 */
929 if (rc) {
930 tslot = atomic_read(&dev->_vblank_count[crtc]) + diff;
931 vblanktimestamp(dev, crtc, tslot) = t_vblank;
Mario Kleiner27641c32010-10-23 04:20:23 +0200932 }
933
Mario Kleinerbc215122011-02-21 05:42:01 +0100934 smp_mb__before_atomic_inc();
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700935 atomic_add(diff, &dev->_vblank_count[crtc]);
Mario Kleinerbc215122011-02-21 05:42:01 +0100936 smp_mb__after_atomic_inc();
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700937}
938
939/**
940 * drm_vblank_get - get a reference count on vblank events
941 * @dev: DRM device
942 * @crtc: which CRTC to own
943 *
944 * Acquire a reference count on vblank events to avoid having them disabled
945 * while in use.
946 *
947 * RETURNS
948 * Zero on success, nonzero on failure.
949 */
950int drm_vblank_get(struct drm_device *dev, int crtc)
951{
Mario Kleiner27641c32010-10-23 04:20:23 +0200952 unsigned long irqflags, irqflags2;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700953 int ret = 0;
954
955 spin_lock_irqsave(&dev->vbl_lock, irqflags);
956 /* Going from 0->1 means we have to enable interrupts again */
Li Peng778c9022009-11-09 12:51:22 +0800957 if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) {
Mario Kleiner27641c32010-10-23 04:20:23 +0200958 spin_lock_irqsave(&dev->vblank_time_lock, irqflags2);
Li Peng778c9022009-11-09 12:51:22 +0800959 if (!dev->vblank_enabled[crtc]) {
Mario Kleiner27641c32010-10-23 04:20:23 +0200960 /* Enable vblank irqs under vblank_time_lock protection.
961 * All vblank count & timestamp updates are held off
962 * until we are done reinitializing master counter and
963 * timestamps. Filtercode in drm_handle_vblank() will
964 * prevent double-accounting of same vblank interval.
965 */
Li Peng778c9022009-11-09 12:51:22 +0800966 ret = dev->driver->enable_vblank(dev, crtc);
Mario Kleiner27641c32010-10-23 04:20:23 +0200967 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n",
968 crtc, ret);
Li Peng778c9022009-11-09 12:51:22 +0800969 if (ret)
970 atomic_dec(&dev->vblank_refcount[crtc]);
971 else {
972 dev->vblank_enabled[crtc] = 1;
973 drm_update_vblank_count(dev, crtc);
974 }
975 }
Mario Kleiner27641c32010-10-23 04:20:23 +0200976 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2);
Li Peng778c9022009-11-09 12:51:22 +0800977 } else {
978 if (!dev->vblank_enabled[crtc]) {
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700979 atomic_dec(&dev->vblank_refcount[crtc]);
Li Peng778c9022009-11-09 12:51:22 +0800980 ret = -EINVAL;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700981 }
982 }
983 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
984
985 return ret;
986}
987EXPORT_SYMBOL(drm_vblank_get);
988
989/**
990 * drm_vblank_put - give up ownership of vblank events
991 * @dev: DRM device
992 * @crtc: which counter to give up
993 *
994 * Release ownership of a given vblank counter, turning off interrupts
Mario Kleiner27641c32010-10-23 04:20:23 +0200995 * if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700996 */
997void drm_vblank_put(struct drm_device *dev, int crtc)
998{
Mario Kleiner27641c32010-10-23 04:20:23 +0200999 BUG_ON(atomic_read(&dev->vblank_refcount[crtc]) == 0);
Chris Wilsonb3f5e732009-02-19 14:48:22 +00001000
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001001 /* Last user schedules interrupt disable */
Mario Kleiner27641c32010-10-23 04:20:23 +02001002 if (atomic_dec_and_test(&dev->vblank_refcount[crtc]) &&
1003 (drm_vblank_offdelay > 0))
1004 mod_timer(&dev->vblank_disable_timer,
1005 jiffies + ((drm_vblank_offdelay * DRM_HZ)/1000));
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001006}
1007EXPORT_SYMBOL(drm_vblank_put);
1008
Rob Clarkc6eefa12012-10-16 22:48:40 +00001009/**
1010 * drm_vblank_off - disable vblank events on a CRTC
1011 * @dev: DRM device
1012 * @crtc: CRTC in question
1013 *
1014 * Caller must hold event lock.
1015 */
Li Peng778c9022009-11-09 12:51:22 +08001016void drm_vblank_off(struct drm_device *dev, int crtc)
1017{
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001018 struct drm_pending_vblank_event *e, *t;
1019 struct timeval now;
Li Peng778c9022009-11-09 12:51:22 +08001020 unsigned long irqflags;
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001021 unsigned int seq;
Li Peng778c9022009-11-09 12:51:22 +08001022
1023 spin_lock_irqsave(&dev->vbl_lock, irqflags);
Mario Kleiner27641c32010-10-23 04:20:23 +02001024 vblank_disable_and_save(dev, crtc);
Li Peng778c9022009-11-09 12:51:22 +08001025 DRM_WAKEUP(&dev->vbl_queue[crtc]);
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001026
1027 /* Send any queued vblank events, lest the natives grow disquiet */
1028 seq = drm_vblank_count_and_time(dev, crtc, &now);
Imre Deake7783ba2012-11-02 13:30:50 +02001029
1030 spin_lock(&dev->event_lock);
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001031 list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
1032 if (e->pipe != crtc)
1033 continue;
1034 DRM_DEBUG("Sending premature vblank event on disable: \
1035 wanted %d, current %d\n",
1036 e->event.sequence, seq);
Rob Clarkc6eefa12012-10-16 22:48:40 +00001037 list_del(&e->base.link);
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001038 drm_vblank_put(dev, e->pipe);
Rob Clarkc6eefa12012-10-16 22:48:40 +00001039 send_vblank_event(dev, e, seq, &now);
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001040 }
Imre Deake7783ba2012-11-02 13:30:50 +02001041 spin_unlock(&dev->event_lock);
Christopher James Halse Rogers498548e2011-04-27 16:10:57 +10001042
Li Peng778c9022009-11-09 12:51:22 +08001043 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
1044}
1045EXPORT_SYMBOL(drm_vblank_off);
1046
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001047/**
Dave Airlief453ba02008-11-07 14:05:41 -08001048 * drm_vblank_pre_modeset - account for vblanks across mode sets
1049 * @dev: DRM device
1050 * @crtc: CRTC in question
Dave Airlief453ba02008-11-07 14:05:41 -08001051 *
1052 * Account for vblank events across mode setting events, which will likely
1053 * reset the hardware frame counter.
1054 */
1055void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
1056{
Jerome Glissee77cef92010-01-07 15:39:13 +01001057 /* vblank is not initialized (IRQ not installed ?) */
1058 if (!dev->num_crtcs)
1059 return;
Dave Airlief453ba02008-11-07 14:05:41 -08001060 /*
1061 * To avoid all the problems that might happen if interrupts
1062 * were enabled/disabled around or between these calls, we just
1063 * have the kernel take a reference on the CRTC (just once though
1064 * to avoid corrupting the count if multiple, mismatch calls occur),
1065 * so that interrupts remain enabled in the interim.
1066 */
1067 if (!dev->vblank_inmodeset[crtc]) {
Chris Wilsonb3f5e732009-02-19 14:48:22 +00001068 dev->vblank_inmodeset[crtc] = 0x1;
1069 if (drm_vblank_get(dev, crtc) == 0)
1070 dev->vblank_inmodeset[crtc] |= 0x2;
Dave Airlief453ba02008-11-07 14:05:41 -08001071 }
1072}
1073EXPORT_SYMBOL(drm_vblank_pre_modeset);
1074
1075void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
1076{
1077 unsigned long irqflags;
1078
1079 if (dev->vblank_inmodeset[crtc]) {
1080 spin_lock_irqsave(&dev->vbl_lock, irqflags);
1081 dev->vblank_disable_allowed = 1;
Dave Airlief453ba02008-11-07 14:05:41 -08001082 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
Chris Wilsonb3f5e732009-02-19 14:48:22 +00001083
1084 if (dev->vblank_inmodeset[crtc] & 0x2)
1085 drm_vblank_put(dev, crtc);
1086
1087 dev->vblank_inmodeset[crtc] = 0;
Dave Airlief453ba02008-11-07 14:05:41 -08001088 }
1089}
1090EXPORT_SYMBOL(drm_vblank_post_modeset);
1091
1092/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001093 * drm_modeset_ctl - handle vblank event counter changes across mode switch
1094 * @DRM_IOCTL_ARGS: standard ioctl arguments
1095 *
1096 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
1097 * ioctls around modesetting so that any lost vblank events are accounted for.
1098 *
1099 * Generally the counter will reset across mode sets. If interrupts are
1100 * enabled around this call, we don't have to do anything since the counter
1101 * will have already been incremented.
1102 */
1103int drm_modeset_ctl(struct drm_device *dev, void *data,
1104 struct drm_file *file_priv)
1105{
1106 struct drm_modeset_ctl *modeset = data;
Dave Airlie19227562011-02-24 08:35:06 +10001107 unsigned int crtc;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001108
1109 /* If drm_vblank_init() hasn't been called yet, just no-op */
1110 if (!dev->num_crtcs)
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001111 return 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001112
Laurent Pinchart29935552012-05-30 00:58:09 +02001113 /* KMS drivers handle this internally */
1114 if (drm_core_check_feature(dev, DRIVER_MODESET))
1115 return 0;
1116
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001117 crtc = modeset->crtc;
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001118 if (crtc >= dev->num_crtcs)
1119 return -EINVAL;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001120
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001121 switch (modeset->cmd) {
1122 case _DRM_PRE_MODESET:
Dave Airlief453ba02008-11-07 14:05:41 -08001123 drm_vblank_pre_modeset(dev, crtc);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001124 break;
1125 case _DRM_POST_MODESET:
Dave Airlief453ba02008-11-07 14:05:41 -08001126 drm_vblank_post_modeset(dev, crtc);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001127 break;
1128 default:
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001129 return -EINVAL;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001130 }
1131
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001132 return 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001133}
1134
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001135static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
1136 union drm_wait_vblank *vblwait,
1137 struct drm_file *file_priv)
1138{
1139 struct drm_pending_vblank_event *e;
1140 struct timeval now;
1141 unsigned long flags;
1142 unsigned int seq;
Chris Wilsonea5d5522010-12-01 19:41:31 +00001143 int ret;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001144
1145 e = kzalloc(sizeof *e, GFP_KERNEL);
Chris Wilsonea5d5522010-12-01 19:41:31 +00001146 if (e == NULL) {
1147 ret = -ENOMEM;
1148 goto err_put;
1149 }
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001150
1151 e->pipe = pipe;
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001152 e->base.pid = current->pid;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001153 e->event.base.type = DRM_EVENT_VBLANK;
1154 e->event.base.length = sizeof e->event;
1155 e->event.user_data = vblwait->request.signal;
1156 e->base.event = &e->event.base;
1157 e->base.file_priv = file_priv;
1158 e->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
1159
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001160 spin_lock_irqsave(&dev->event_lock, flags);
1161
1162 if (file_priv->event_space < sizeof e->event) {
Chris Wilsonea5d5522010-12-01 19:41:31 +00001163 ret = -EBUSY;
1164 goto err_unlock;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001165 }
1166
1167 file_priv->event_space -= sizeof e->event;
Mario Kleiner27641c32010-10-23 04:20:23 +02001168 seq = drm_vblank_count_and_time(dev, pipe, &now);
1169
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001170 if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) &&
1171 (seq - vblwait->request.sequence) <= (1 << 23)) {
1172 vblwait->request.sequence = seq + 1;
Jesse Barnes4a921642009-11-10 08:21:25 +00001173 vblwait->reply.sequence = vblwait->request.sequence;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001174 }
1175
1176 DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n",
1177 vblwait->request.sequence, seq, pipe);
1178
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001179 trace_drm_vblank_event_queued(current->pid, pipe,
1180 vblwait->request.sequence);
1181
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001182 e->event.sequence = vblwait->request.sequence;
1183 if ((seq - vblwait->request.sequence) <= (1 << 23)) {
Dan Carpenter6f331622010-12-09 08:35:40 +03001184 drm_vblank_put(dev, pipe);
Rob Clarkc6eefa12012-10-16 22:48:40 +00001185 send_vblank_event(dev, e, seq, &now);
Mario Kleiner000fa7c2010-12-10 16:00:19 +01001186 vblwait->reply.sequence = seq;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001187 } else {
Ilija Hadzica6778e92011-10-31 13:11:57 -04001188 /* drm_handle_vblank_events will call drm_vblank_put */
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001189 list_add_tail(&e->base.link, &dev->vblank_event_list);
Mario Kleiner000fa7c2010-12-10 16:00:19 +01001190 vblwait->reply.sequence = vblwait->request.sequence;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001191 }
1192
1193 spin_unlock_irqrestore(&dev->event_lock, flags);
1194
1195 return 0;
Chris Wilsonea5d5522010-12-01 19:41:31 +00001196
1197err_unlock:
1198 spin_unlock_irqrestore(&dev->event_lock, flags);
1199 kfree(e);
1200err_put:
Dan Carpenter6f331622010-12-09 08:35:40 +03001201 drm_vblank_put(dev, pipe);
Chris Wilsonea5d5522010-12-01 19:41:31 +00001202 return ret;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001203}
1204
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001205/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 * Wait for VBLANK.
1207 *
1208 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +10001209 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 * \param cmd command.
1211 * \param data user argument, pointing to a drm_wait_vblank structure.
1212 * \return zero on success or a negative number on failure.
1213 *
Eric Anholt30b23632009-01-27 21:19:41 -08001214 * This function enables the vblank interrupt on the pipe requested, then
1215 * sleeps waiting for the requested sequence number to occur, and drops
1216 * the vblank interrupt refcount afterwards. (vblank irq disable follows that
1217 * after a timeout with no further vblank waits scheduled).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001219int drm_wait_vblank(struct drm_device *dev, void *data,
1220 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221{
Eric Anholtc153f452007-09-03 12:06:45 +10001222 union drm_wait_vblank *vblwait = data;
Laurent Pinchart4a1b0712012-05-17 13:27:21 +02001223 int ret;
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001224 unsigned int flags, seq, crtc, high_crtc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225
Thierry Reding03f65092013-01-14 16:05:56 +00001226 if (drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
1227 if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled))
1228 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229
Eric Anholt30b23632009-01-27 21:19:41 -08001230 if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
1231 return -EINVAL;
1232
Eric Anholtc153f452007-09-03 12:06:45 +10001233 if (vblwait->request.type &
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001234 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
1235 _DRM_VBLANK_HIGH_CRTC_MASK)) {
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001236 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
Eric Anholtc153f452007-09-03 12:06:45 +10001237 vblwait->request.type,
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001238 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
1239 _DRM_VBLANK_HIGH_CRTC_MASK));
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001240 return -EINVAL;
1241 }
1242
Eric Anholtc153f452007-09-03 12:06:45 +10001243 flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
Ilija Hadzic19b01b52011-03-18 16:58:04 -05001244 high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK);
1245 if (high_crtc)
1246 crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT;
1247 else
1248 crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001249 if (crtc >= dev->num_crtcs)
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001250 return -EINVAL;
1251
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001252 ret = drm_vblank_get(dev, crtc);
1253 if (ret) {
Paul Rolland8d3457e2009-08-09 12:24:01 +10001254 DRM_DEBUG("failed to acquire vblank counter, %d\n", ret);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001255 return ret;
1256 }
1257 seq = drm_vblank_count(dev, crtc);
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001258
Eric Anholtc153f452007-09-03 12:06:45 +10001259 switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 case _DRM_VBLANK_RELATIVE:
Eric Anholtc153f452007-09-03 12:06:45 +10001261 vblwait->request.sequence += seq;
1262 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 case _DRM_VBLANK_ABSOLUTE:
1264 break;
1265 default:
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001266 ret = -EINVAL;
1267 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 }
1269
Ilija Hadzica6778e92011-10-31 13:11:57 -04001270 if (flags & _DRM_VBLANK_EVENT) {
1271 /* must hold on to the vblank ref until the event fires
1272 * drm_vblank_put will be called asynchronously
1273 */
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001274 return drm_queue_vblank_event(dev, crtc, vblwait, file_priv);
Ilija Hadzica6778e92011-10-31 13:11:57 -04001275 }
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001276
=?utf-8?q?Michel_D=C3=A4nzer?=ab285d72006-10-24 23:34:18 +10001277 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
Eric Anholtc153f452007-09-03 12:06:45 +10001278 (seq - vblwait->request.sequence) <= (1<<23)) {
1279 vblwait->request.sequence = seq + 1;
=?utf-8?q?Michel_D=C3=A4nzer?=ab285d72006-10-24 23:34:18 +10001280 }
1281
Eric Anholt30b23632009-01-27 21:19:41 -08001282 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
1283 vblwait->request.sequence, crtc);
1284 dev->last_vblank_wait[crtc] = vblwait->request.sequence;
1285 DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
1286 (((drm_vblank_count(dev, crtc) -
1287 vblwait->request.sequence) <= (1 << 23)) ||
1288 !dev->irq_enabled));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289
Eric Anholt30b23632009-01-27 21:19:41 -08001290 if (ret != -EINTR) {
1291 struct timeval now;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292
Mario Kleiner27641c32010-10-23 04:20:23 +02001293 vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now);
Eric Anholt30b23632009-01-27 21:19:41 -08001294 vblwait->reply.tval_sec = now.tv_sec;
1295 vblwait->reply.tval_usec = now.tv_usec;
Mario Kleiner27641c32010-10-23 04:20:23 +02001296
Eric Anholt30b23632009-01-27 21:19:41 -08001297 DRM_DEBUG("returning %d to client\n",
1298 vblwait->reply.sequence);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 } else {
Eric Anholt30b23632009-01-27 21:19:41 -08001300 DRM_DEBUG("vblank wait interrupted by signal\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 }
1302
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001303done:
1304 drm_vblank_put(dev, crtc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 return ret;
1306}
1307
Sachin Kamatea7f7ab2012-08-01 17:15:31 +05301308static void drm_handle_vblank_events(struct drm_device *dev, int crtc)
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001309{
1310 struct drm_pending_vblank_event *e, *t;
1311 struct timeval now;
1312 unsigned long flags;
1313 unsigned int seq;
1314
Mario Kleiner27641c32010-10-23 04:20:23 +02001315 seq = drm_vblank_count_and_time(dev, crtc, &now);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001316
1317 spin_lock_irqsave(&dev->event_lock, flags);
1318
1319 list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
1320 if (e->pipe != crtc)
1321 continue;
1322 if ((seq - e->event.sequence) > (1<<23))
1323 continue;
1324
1325 DRM_DEBUG("vblank event on %d, current %d\n",
1326 e->event.sequence, seq);
1327
Rob Clarkc6eefa12012-10-16 22:48:40 +00001328 list_del(&e->base.link);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001329 drm_vblank_put(dev, e->pipe);
Rob Clarkc6eefa12012-10-16 22:48:40 +00001330 send_vblank_event(dev, e, seq, &now);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001331 }
1332
1333 spin_unlock_irqrestore(&dev->event_lock, flags);
Jesse Barnesac2874b2010-07-01 16:47:31 -07001334
1335 trace_drm_vblank_event(crtc, seq);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001336}
1337
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001339 * drm_handle_vblank - handle a vblank event
1340 * @dev: DRM device
1341 * @crtc: where this event occurred
1342 *
1343 * Drivers should call this routine in their vblank interrupt handlers to
1344 * update the vblank counter and send any signals that may be pending.
1345 */
Chris Wilson78c6e172011-01-31 10:48:04 +00001346bool drm_handle_vblank(struct drm_device *dev, int crtc)
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001347{
Mario Kleiner27641c32010-10-23 04:20:23 +02001348 u32 vblcount;
1349 s64 diff_ns;
1350 struct timeval tvblank;
1351 unsigned long irqflags;
1352
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001353 if (!dev->num_crtcs)
Chris Wilson78c6e172011-01-31 10:48:04 +00001354 return false;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001355
Mario Kleiner27641c32010-10-23 04:20:23 +02001356 /* Need timestamp lock to prevent concurrent execution with
1357 * vblank enable/disable, as this would cause inconsistent
1358 * or corrupted timestamps and vblank counts.
1359 */
1360 spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
1361
1362 /* Vblank irq handling disabled. Nothing to do. */
1363 if (!dev->vblank_enabled[crtc]) {
1364 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
Chris Wilson78c6e172011-01-31 10:48:04 +00001365 return false;
Mario Kleiner27641c32010-10-23 04:20:23 +02001366 }
1367
1368 /* Fetch corresponding timestamp for this vblank interval from
1369 * driver and store it in proper slot of timestamp ringbuffer.
1370 */
1371
1372 /* Get current timestamp and count. */
1373 vblcount = atomic_read(&dev->_vblank_count[crtc]);
1374 drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ);
1375
1376 /* Compute time difference to timestamp of last vblank */
1377 diff_ns = timeval_to_ns(&tvblank) -
1378 timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
1379
1380 /* Update vblank timestamp and count if at least
1381 * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds
1382 * difference between last stored timestamp and current
1383 * timestamp. A smaller difference means basically
1384 * identical timestamps. Happens if this vblank has
1385 * been already processed and this is a redundant call,
1386 * e.g., due to spurious vblank interrupts. We need to
1387 * ignore those for accounting.
1388 */
Mario Kleinerc4cc3832011-02-21 05:42:00 +01001389 if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) {
Mario Kleiner27641c32010-10-23 04:20:23 +02001390 /* Store new timestamp in ringbuffer. */
1391 vblanktimestamp(dev, crtc, vblcount + 1) = tvblank;
Mario Kleiner27641c32010-10-23 04:20:23 +02001392
1393 /* Increment cooked vblank count. This also atomically commits
1394 * the timestamp computed above.
1395 */
Mario Kleinerbc215122011-02-21 05:42:01 +01001396 smp_mb__before_atomic_inc();
Mario Kleiner27641c32010-10-23 04:20:23 +02001397 atomic_inc(&dev->_vblank_count[crtc]);
Mario Kleinerbc215122011-02-21 05:42:01 +01001398 smp_mb__after_atomic_inc();
Mario Kleiner27641c32010-10-23 04:20:23 +02001399 } else {
1400 DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n",
1401 crtc, (int) diff_ns);
1402 }
1403
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001404 DRM_WAKEUP(&dev->vbl_queue[crtc]);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001405 drm_handle_vblank_events(dev, crtc);
Mario Kleiner27641c32010-10-23 04:20:23 +02001406
1407 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
Chris Wilson78c6e172011-01-31 10:48:04 +00001408 return true;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001409}
1410EXPORT_SYMBOL(drm_handle_vblank);