blob: 53120a72a48c68ff1457875d867eff7306b18145 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/**
Dave Airlieb5e89ed2005-09-25 14:28:13 +10002 * \file drm_irq.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * IRQ support
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9/*
10 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
11 *
12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
22 *
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
34 */
35
36#include "drmP.h"
Jesse Barnesac2874b2010-07-01 16:47:31 -070037#include "drm_trace.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <linux/interrupt.h> /* For task queue support */
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Dave Airlie28d52042009-09-21 14:33:58 +100042#include <linux/vgaarb.h>
Mario Kleiner27641c32010-10-23 04:20:23 +020043
44/* Access macro for slots in vblank timestamp ringbuffer. */
45#define vblanktimestamp(dev, crtc, count) ( \
46 (dev)->_vblank_time[(crtc) * DRM_VBLANKTIME_RBSIZE + \
47 ((count) % DRM_VBLANKTIME_RBSIZE)])
48
49/* Retry timestamp calculation up to 3 times to satisfy
50 * drm_timestamp_precision before giving up.
51 */
52#define DRM_TIMESTAMP_MAXRETRIES 3
53
54/* Threshold in nanoseconds for detection of redundant
55 * vblank irq in drm_handle_vblank(). 1 msec should be ok.
56 */
57#define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
58
Linus Torvalds1da177e2005-04-16 15:20:36 -070059/**
60 * Get interrupt from bus id.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100061 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +100063 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 * \param cmd command.
65 * \param arg user argument, pointing to a drm_irq_busid structure.
66 * \return zero on success or a negative number on failure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100067 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 * Finds the PCI device with the specified bus id and gets its IRQ number.
69 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
70 * to that of the device that this DRM instance attached to.
71 */
Eric Anholtc153f452007-09-03 12:06:45 +100072int drm_irq_by_busid(struct drm_device *dev, void *data,
73 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074{
Eric Anholtc153f452007-09-03 12:06:45 +100075 struct drm_irq_busid *p = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Jordan Crousedcdb1672010-05-27 13:40:25 -060077 if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE))
78 return -EINVAL;
79
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
81 return -EINVAL;
82
Eric Anholtc153f452007-09-03 12:06:45 +100083 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
84 (p->busnum & 0xff) != dev->pdev->bus->number ||
85 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 return -EINVAL;
87
Eric Anholted4cb412008-07-29 12:10:39 -070088 p->irq = dev->pdev->irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Eric Anholtc153f452007-09-03 12:06:45 +100090 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
91 p->irq);
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 return 0;
94}
95
Mario Kleiner27641c32010-10-23 04:20:23 +020096/*
97 * Clear vblank timestamp buffer for a crtc.
98 */
99static void clear_vblank_timestamps(struct drm_device *dev, int crtc)
100{
101 memset(&dev->_vblank_time[crtc * DRM_VBLANKTIME_RBSIZE], 0,
102 DRM_VBLANKTIME_RBSIZE * sizeof(struct timeval));
103}
104
105/*
106 * Disable vblank irq's on crtc, make sure that last vblank count
107 * of hardware and corresponding consistent software vblank counter
108 * are preserved, even if there are any spurious vblank irq's after
109 * disable.
110 */
111static void vblank_disable_and_save(struct drm_device *dev, int crtc)
112{
113 unsigned long irqflags;
114 u32 vblcount;
115 s64 diff_ns;
116 int vblrc;
117 struct timeval tvblank;
118
119 /* Prevent vblank irq processing while disabling vblank irqs,
120 * so no updates of timestamps or count can happen after we've
121 * disabled. Needed to prevent races in case of delayed irq's.
122 * Disable preemption, so vblank_time_lock is held as short as
123 * possible, even under a kernel with PREEMPT_RT patches.
124 */
125 preempt_disable();
126 spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
127
128 dev->driver->disable_vblank(dev, crtc);
129 dev->vblank_enabled[crtc] = 0;
130
131 /* No further vblank irq's will be processed after
132 * this point. Get current hardware vblank count and
133 * vblank timestamp, repeat until they are consistent.
134 *
135 * FIXME: There is still a race condition here and in
136 * drm_update_vblank_count() which can cause off-by-one
137 * reinitialization of software vblank counter. If gpu
138 * vblank counter doesn't increment exactly at the leading
139 * edge of a vblank interval, then we can lose 1 count if
140 * we happen to execute between start of vblank and the
141 * delayed gpu counter increment.
142 */
143 do {
144 dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc);
145 vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0);
146 } while (dev->last_vblank[crtc] != dev->driver->get_vblank_counter(dev, crtc));
147
148 /* Compute time difference to stored timestamp of last vblank
149 * as updated by last invocation of drm_handle_vblank() in vblank irq.
150 */
151 vblcount = atomic_read(&dev->_vblank_count[crtc]);
152 diff_ns = timeval_to_ns(&tvblank) -
153 timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
154
155 /* If there is at least 1 msec difference between the last stored
156 * timestamp and tvblank, then we are currently executing our
157 * disable inside a new vblank interval, the tvblank timestamp
158 * corresponds to this new vblank interval and the irq handler
159 * for this vblank didn't run yet and won't run due to our disable.
160 * Therefore we need to do the job of drm_handle_vblank() and
161 * increment the vblank counter by one to account for this vblank.
162 *
163 * Skip this step if there isn't any high precision timestamp
164 * available. In that case we can't account for this and just
165 * hope for the best.
166 */
Mario Kleinerbc215122011-02-21 05:42:01 +0100167 if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) {
Mario Kleiner27641c32010-10-23 04:20:23 +0200168 atomic_inc(&dev->_vblank_count[crtc]);
Mario Kleinerbc215122011-02-21 05:42:01 +0100169 smp_mb__after_atomic_inc();
170 }
Mario Kleiner27641c32010-10-23 04:20:23 +0200171
172 /* Invalidate all timestamps while vblank irq's are off. */
173 clear_vblank_timestamps(dev, crtc);
174
175 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
176 preempt_enable();
177}
178
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700179static void vblank_disable_fn(unsigned long arg)
180{
181 struct drm_device *dev = (struct drm_device *)arg;
182 unsigned long irqflags;
183 int i;
184
185 if (!dev->vblank_disable_allowed)
186 return;
187
188 for (i = 0; i < dev->num_crtcs; i++) {
189 spin_lock_irqsave(&dev->vbl_lock, irqflags);
190 if (atomic_read(&dev->vblank_refcount[i]) == 0 &&
191 dev->vblank_enabled[i]) {
192 DRM_DEBUG("disabling vblank on crtc %d\n", i);
Mario Kleiner27641c32010-10-23 04:20:23 +0200193 vblank_disable_and_save(dev, i);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700194 }
195 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
196 }
197}
198
Keith Packard52440212008-11-18 09:30:25 -0800199void drm_vblank_cleanup(struct drm_device *dev)
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700200{
201 /* Bail if the driver didn't call drm_vblank_init() */
202 if (dev->num_crtcs == 0)
203 return;
204
205 del_timer(&dev->vblank_disable_timer);
206
207 vblank_disable_fn((unsigned long)dev);
208
Eric Anholt9a298b22009-03-24 12:23:04 -0700209 kfree(dev->vbl_queue);
210 kfree(dev->_vblank_count);
211 kfree(dev->vblank_refcount);
212 kfree(dev->vblank_enabled);
213 kfree(dev->last_vblank);
214 kfree(dev->last_vblank_wait);
215 kfree(dev->vblank_inmodeset);
Mario Kleiner27641c32010-10-23 04:20:23 +0200216 kfree(dev->_vblank_time);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700217
218 dev->num_crtcs = 0;
219}
Jerome Glissee77cef92010-01-07 15:39:13 +0100220EXPORT_SYMBOL(drm_vblank_cleanup);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700221
222int drm_vblank_init(struct drm_device *dev, int num_crtcs)
223{
224 int i, ret = -ENOMEM;
225
226 setup_timer(&dev->vblank_disable_timer, vblank_disable_fn,
227 (unsigned long)dev);
228 spin_lock_init(&dev->vbl_lock);
Mario Kleiner27641c32010-10-23 04:20:23 +0200229 spin_lock_init(&dev->vblank_time_lock);
230
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700231 dev->num_crtcs = num_crtcs;
232
Eric Anholt9a298b22009-03-24 12:23:04 -0700233 dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs,
234 GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700235 if (!dev->vbl_queue)
236 goto err;
237
Eric Anholt9a298b22009-03-24 12:23:04 -0700238 dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700239 if (!dev->_vblank_count)
240 goto err;
241
Eric Anholt9a298b22009-03-24 12:23:04 -0700242 dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs,
243 GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700244 if (!dev->vblank_refcount)
245 goto err;
246
Eric Anholt9a298b22009-03-24 12:23:04 -0700247 dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700248 if (!dev->vblank_enabled)
249 goto err;
250
Eric Anholt9a298b22009-03-24 12:23:04 -0700251 dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700252 if (!dev->last_vblank)
253 goto err;
254
Eric Anholt9a298b22009-03-24 12:23:04 -0700255 dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
Eric Anholtfede5c92008-12-19 17:23:38 -0800256 if (!dev->last_vblank_wait)
257 goto err;
258
Eric Anholt9a298b22009-03-24 12:23:04 -0700259 dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700260 if (!dev->vblank_inmodeset)
261 goto err;
262
Mario Kleiner27641c32010-10-23 04:20:23 +0200263 dev->_vblank_time = kcalloc(num_crtcs * DRM_VBLANKTIME_RBSIZE,
264 sizeof(struct timeval), GFP_KERNEL);
265 if (!dev->_vblank_time)
266 goto err;
267
268 DRM_INFO("Supports vblank timestamp caching Rev 1 (10.10.2010).\n");
269
270 /* Driver specific high-precision vblank timestamping supported? */
271 if (dev->driver->get_vblank_timestamp)
272 DRM_INFO("Driver supports precise vblank timestamp query.\n");
273 else
274 DRM_INFO("No driver support for vblank timestamp query.\n");
275
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700276 /* Zero per-crtc vblank stuff */
277 for (i = 0; i < num_crtcs; i++) {
278 init_waitqueue_head(&dev->vbl_queue[i]);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700279 atomic_set(&dev->_vblank_count[i], 0);
280 atomic_set(&dev->vblank_refcount[i], 0);
281 }
282
283 dev->vblank_disable_allowed = 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700284 return 0;
285
286err:
287 drm_vblank_cleanup(dev);
288 return ret;
289}
290EXPORT_SYMBOL(drm_vblank_init);
291
Dave Airlie28d52042009-09-21 14:33:58 +1000292static void drm_irq_vgaarb_nokms(void *cookie, bool state)
293{
294 struct drm_device *dev = cookie;
295
296 if (dev->driver->vgaarb_irq) {
297 dev->driver->vgaarb_irq(dev, state);
298 return;
299 }
300
301 if (!dev->irq_enabled)
302 return;
303
304 if (state)
305 dev->driver->irq_uninstall(dev);
306 else {
307 dev->driver->irq_preinstall(dev);
308 dev->driver->irq_postinstall(dev);
309 }
310}
311
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312/**
313 * Install IRQ handler.
314 *
315 * \param dev DRM device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 *
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700317 * Initializes the IRQ related data. Installs the handler, calling the driver
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
319 * before and after the installation.
320 */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700321int drm_irq_install(struct drm_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322{
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700323 int ret = 0;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000324 unsigned long sh_flags = 0;
Dave Airlieb8da7de2009-06-02 16:50:35 +1000325 char *irqname;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
328 return -EINVAL;
329
Jordan Crousedcdb1672010-05-27 13:40:25 -0600330 if (drm_dev_to_irq(dev) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 return -EINVAL;
332
Dave Airlie30e2fb12006-02-02 19:37:46 +1100333 mutex_lock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
335 /* Driver must have been initialized */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000336 if (!dev->dev_private) {
Dave Airlie30e2fb12006-02-02 19:37:46 +1100337 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 return -EINVAL;
339 }
340
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000341 if (dev->irq_enabled) {
Dave Airlie30e2fb12006-02-02 19:37:46 +1100342 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 return -EBUSY;
344 }
345 dev->irq_enabled = 1;
Dave Airlie30e2fb12006-02-02 19:37:46 +1100346 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Jordan Crousedcdb1672010-05-27 13:40:25 -0600348 DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000350 /* Before installing handler */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 dev->driver->irq_preinstall(dev);
352
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000353 /* Install handler */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
Thomas Gleixner935f6e32006-07-01 19:29:34 -0700355 sh_flags = IRQF_SHARED;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000356
Dave Airlieb8da7de2009-06-02 16:50:35 +1000357 if (dev->devname)
358 irqname = dev->devname;
359 else
360 irqname = dev->driver->name;
361
Jesse Barnes9bfbd5c2008-09-15 15:00:33 -0700362 ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler,
Dave Airlieb8da7de2009-06-02 16:50:35 +1000363 sh_flags, irqname, dev);
Jesse Barnes9bfbd5c2008-09-15 15:00:33 -0700364
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000365 if (ret < 0) {
Dave Airlie30e2fb12006-02-02 19:37:46 +1100366 mutex_lock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 dev->irq_enabled = 0;
Dave Airlie30e2fb12006-02-02 19:37:46 +1100368 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 return ret;
370 }
371
Dave Airlie28d52042009-09-21 14:33:58 +1000372 if (!drm_core_check_feature(dev, DRIVER_MODESET))
373 vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL);
374
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000375 /* After installing handler */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700376 ret = dev->driver->irq_postinstall(dev);
377 if (ret < 0) {
378 mutex_lock(&dev->struct_mutex);
379 dev->irq_enabled = 0;
380 mutex_unlock(&dev->struct_mutex);
381 }
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 *
392 * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
393 */
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 */
410 spin_lock_irqsave(&dev->vbl_lock, irqflags);
411 for (i = 0; i < dev->num_crtcs; i++) {
412 DRM_WAKEUP(&dev->vbl_queue[i]);
413 dev->vblank_enabled[i] = 0;
Jesse Barnes14d200c2009-02-06 13:04:49 -0800414 dev->last_vblank[i] = dev->driver->get_vblank_counter(dev, i);
Jesse Barnesdc1336f2009-01-06 10:21:24 -0800415 }
416 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
417
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000418 if (!irq_enabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 return -EINVAL;
420
Jordan Crousedcdb1672010-05-27 13:40:25 -0600421 DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Dave Airlie28d52042009-09-21 14:33:58 +1000423 if (!drm_core_check_feature(dev, DRIVER_MODESET))
424 vga_client_register(dev->pdev, NULL, NULL, NULL);
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 dev->driver->irq_uninstall(dev);
427
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
697 DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %d.%d -> %d.%d [e %d us, %d rep]\n",
698 crtc, (int) vbl_status, hpos, vpos, raw_time.tv_sec,
699 raw_time.tv_usec, vblank_time->tv_sec, vblank_time->tv_usec,
700 (int) duration_ns/1000, i);
701
702 vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD;
703 if (invbl)
704 vbl_status |= DRM_VBLANKTIME_INVBL;
705
706 return vbl_status;
707}
708EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
709
710/**
711 * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent
712 * vblank interval.
713 *
714 * @dev: DRM device
715 * @crtc: which crtc's vblank timestamp to retrieve
716 * @tvblank: Pointer to target struct timeval which should receive the timestamp
717 * @flags: Flags to pass to driver:
718 * 0 = Default.
719 * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler.
720 *
721 * Fetches the system timestamp corresponding to the time of the most recent
722 * vblank interval on specified crtc. May call into kms-driver to
723 * compute the timestamp with a high-precision GPU specific method.
724 *
725 * Returns zero if timestamp originates from uncorrected do_gettimeofday()
726 * call, i.e., it isn't very precisely locked to the true vblank.
727 *
728 * Returns non-zero if timestamp is considered to be very precise.
729 */
730u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
731 struct timeval *tvblank, unsigned flags)
732{
733 int ret = 0;
734
735 /* Define requested maximum error on timestamps (nanoseconds). */
736 int max_error = (int) drm_timestamp_precision * 1000;
737
738 /* Query driver if possible and precision timestamping enabled. */
739 if (dev->driver->get_vblank_timestamp && (max_error > 0)) {
740 ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error,
741 tvblank, flags);
742 if (ret > 0)
743 return (u32) ret;
744 }
745
746 /* GPU high precision timestamp query unsupported or failed.
747 * Return gettimeofday timestamp as best estimate.
748 */
749 do_gettimeofday(tvblank);
750
751 return 0;
752}
753EXPORT_SYMBOL(drm_get_last_vbltimestamp);
754
755/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700756 * drm_vblank_count - retrieve "cooked" vblank counter value
757 * @dev: DRM device
758 * @crtc: which counter to retrieve
759 *
760 * Fetches the "cooked" vblank count value that represents the number of
761 * vblank events since the system was booted, including lost events due to
762 * modesetting activity.
763 */
764u32 drm_vblank_count(struct drm_device *dev, int crtc)
765{
766 return atomic_read(&dev->_vblank_count[crtc]);
767}
768EXPORT_SYMBOL(drm_vblank_count);
769
770/**
Mario Kleiner27641c32010-10-23 04:20:23 +0200771 * drm_vblank_count_and_time - retrieve "cooked" vblank counter value
772 * and the system timestamp corresponding to that vblank counter value.
773 *
774 * @dev: DRM device
775 * @crtc: which counter to retrieve
776 * @vblanktime: Pointer to struct timeval to receive the vblank timestamp.
777 *
778 * Fetches the "cooked" vblank count value that represents the number of
779 * vblank events since the system was booted, including lost events due to
780 * modesetting activity. Returns corresponding system timestamp of the time
781 * of the vblank interval that corresponds to the current value vblank counter
782 * value.
783 */
784u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc,
785 struct timeval *vblanktime)
786{
787 u32 cur_vblank;
788
789 /* Read timestamp from slot of _vblank_time ringbuffer
790 * that corresponds to current vblank count. Retry if
791 * count has incremented during readout. This works like
792 * a seqlock.
793 */
794 do {
795 cur_vblank = atomic_read(&dev->_vblank_count[crtc]);
796 *vblanktime = vblanktimestamp(dev, crtc, cur_vblank);
797 smp_rmb();
798 } while (cur_vblank != atomic_read(&dev->_vblank_count[crtc]));
799
800 return cur_vblank;
801}
802EXPORT_SYMBOL(drm_vblank_count_and_time);
803
804/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700805 * drm_update_vblank_count - update the master vblank counter
806 * @dev: DRM device
807 * @crtc: counter to update
808 *
809 * Call back into the driver to update the appropriate vblank counter
810 * (specified by @crtc). Deal with wraparound, if it occurred, and
811 * update the last read value so we can deal with wraparound on the next
812 * call if necessary.
813 *
814 * Only necessary when going from off->on, to account for frames we
815 * didn't get an interrupt for.
816 *
817 * Note: caller must hold dev->vbl_lock since this reads & writes
818 * device vblank fields.
819 */
820static void drm_update_vblank_count(struct drm_device *dev, int crtc)
821{
Mario Kleiner27641c32010-10-23 04:20:23 +0200822 u32 cur_vblank, diff, tslot, rc;
823 struct timeval t_vblank;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700824
825 /*
826 * Interrupts were disabled prior to this call, so deal with counter
827 * wrap if needed.
828 * NOTE! It's possible we lost a full dev->max_vblank_count events
829 * here if the register is small or we had vblank interrupts off for
830 * a long time.
Mario Kleiner27641c32010-10-23 04:20:23 +0200831 *
832 * We repeat the hardware vblank counter & timestamp query until
833 * we get consistent results. This to prevent races between gpu
834 * updating its hardware counter while we are retrieving the
835 * corresponding vblank timestamp.
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700836 */
Mario Kleiner27641c32010-10-23 04:20:23 +0200837 do {
838 cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
839 rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0);
840 } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc));
841
842 /* Deal with counter wrap */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700843 diff = cur_vblank - dev->last_vblank[crtc];
844 if (cur_vblank < dev->last_vblank[crtc]) {
845 diff += dev->max_vblank_count;
846
847 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
848 crtc, dev->last_vblank[crtc], cur_vblank, diff);
849 }
850
851 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
852 crtc, diff);
853
Mario Kleiner27641c32010-10-23 04:20:23 +0200854 /* Reinitialize corresponding vblank timestamp if high-precision query
855 * available. Skip this step if query unsupported or failed. Will
856 * reinitialize delayed at next vblank interrupt in that case.
857 */
858 if (rc) {
859 tslot = atomic_read(&dev->_vblank_count[crtc]) + diff;
860 vblanktimestamp(dev, crtc, tslot) = t_vblank;
Mario Kleiner27641c32010-10-23 04:20:23 +0200861 }
862
Mario Kleinerbc215122011-02-21 05:42:01 +0100863 smp_mb__before_atomic_inc();
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700864 atomic_add(diff, &dev->_vblank_count[crtc]);
Mario Kleinerbc215122011-02-21 05:42:01 +0100865 smp_mb__after_atomic_inc();
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700866}
867
868/**
869 * drm_vblank_get - get a reference count on vblank events
870 * @dev: DRM device
871 * @crtc: which CRTC to own
872 *
873 * Acquire a reference count on vblank events to avoid having them disabled
874 * while in use.
875 *
876 * RETURNS
877 * Zero on success, nonzero on failure.
878 */
879int drm_vblank_get(struct drm_device *dev, int crtc)
880{
Mario Kleiner27641c32010-10-23 04:20:23 +0200881 unsigned long irqflags, irqflags2;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700882 int ret = 0;
883
884 spin_lock_irqsave(&dev->vbl_lock, irqflags);
885 /* Going from 0->1 means we have to enable interrupts again */
Li Peng778c9022009-11-09 12:51:22 +0800886 if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) {
Mario Kleiner27641c32010-10-23 04:20:23 +0200887 /* Disable preemption while holding vblank_time_lock. Do
888 * it explicitely to guard against PREEMPT_RT kernel.
889 */
890 preempt_disable();
891 spin_lock_irqsave(&dev->vblank_time_lock, irqflags2);
Li Peng778c9022009-11-09 12:51:22 +0800892 if (!dev->vblank_enabled[crtc]) {
Mario Kleiner27641c32010-10-23 04:20:23 +0200893 /* Enable vblank irqs under vblank_time_lock protection.
894 * All vblank count & timestamp updates are held off
895 * until we are done reinitializing master counter and
896 * timestamps. Filtercode in drm_handle_vblank() will
897 * prevent double-accounting of same vblank interval.
898 */
Li Peng778c9022009-11-09 12:51:22 +0800899 ret = dev->driver->enable_vblank(dev, crtc);
Mario Kleiner27641c32010-10-23 04:20:23 +0200900 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n",
901 crtc, ret);
Li Peng778c9022009-11-09 12:51:22 +0800902 if (ret)
903 atomic_dec(&dev->vblank_refcount[crtc]);
904 else {
905 dev->vblank_enabled[crtc] = 1;
906 drm_update_vblank_count(dev, crtc);
907 }
908 }
Mario Kleiner27641c32010-10-23 04:20:23 +0200909 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2);
910 preempt_enable();
Li Peng778c9022009-11-09 12:51:22 +0800911 } else {
912 if (!dev->vblank_enabled[crtc]) {
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700913 atomic_dec(&dev->vblank_refcount[crtc]);
Li Peng778c9022009-11-09 12:51:22 +0800914 ret = -EINVAL;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700915 }
916 }
917 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
918
919 return ret;
920}
921EXPORT_SYMBOL(drm_vblank_get);
922
923/**
924 * drm_vblank_put - give up ownership of vblank events
925 * @dev: DRM device
926 * @crtc: which counter to give up
927 *
928 * Release ownership of a given vblank counter, turning off interrupts
Mario Kleiner27641c32010-10-23 04:20:23 +0200929 * if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700930 */
931void drm_vblank_put(struct drm_device *dev, int crtc)
932{
Mario Kleiner27641c32010-10-23 04:20:23 +0200933 BUG_ON(atomic_read(&dev->vblank_refcount[crtc]) == 0);
Chris Wilsonb3f5e732009-02-19 14:48:22 +0000934
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700935 /* Last user schedules interrupt disable */
Mario Kleiner27641c32010-10-23 04:20:23 +0200936 if (atomic_dec_and_test(&dev->vblank_refcount[crtc]) &&
937 (drm_vblank_offdelay > 0))
938 mod_timer(&dev->vblank_disable_timer,
939 jiffies + ((drm_vblank_offdelay * DRM_HZ)/1000));
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700940}
941EXPORT_SYMBOL(drm_vblank_put);
942
Li Peng778c9022009-11-09 12:51:22 +0800943void drm_vblank_off(struct drm_device *dev, int crtc)
944{
945 unsigned long irqflags;
946
947 spin_lock_irqsave(&dev->vbl_lock, irqflags);
Mario Kleiner27641c32010-10-23 04:20:23 +0200948 vblank_disable_and_save(dev, crtc);
Li Peng778c9022009-11-09 12:51:22 +0800949 DRM_WAKEUP(&dev->vbl_queue[crtc]);
Li Peng778c9022009-11-09 12:51:22 +0800950 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
951}
952EXPORT_SYMBOL(drm_vblank_off);
953
Jesse Barnes0a3e67a2008-09-30 12:14:26 -0700954/**
Dave Airlief453ba02008-11-07 14:05:41 -0800955 * drm_vblank_pre_modeset - account for vblanks across mode sets
956 * @dev: DRM device
957 * @crtc: CRTC in question
958 * @post: post or pre mode set?
959 *
960 * Account for vblank events across mode setting events, which will likely
961 * reset the hardware frame counter.
962 */
963void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
964{
Jerome Glissee77cef92010-01-07 15:39:13 +0100965 /* vblank is not initialized (IRQ not installed ?) */
966 if (!dev->num_crtcs)
967 return;
Dave Airlief453ba02008-11-07 14:05:41 -0800968 /*
969 * To avoid all the problems that might happen if interrupts
970 * were enabled/disabled around or between these calls, we just
971 * have the kernel take a reference on the CRTC (just once though
972 * to avoid corrupting the count if multiple, mismatch calls occur),
973 * so that interrupts remain enabled in the interim.
974 */
975 if (!dev->vblank_inmodeset[crtc]) {
Chris Wilsonb3f5e732009-02-19 14:48:22 +0000976 dev->vblank_inmodeset[crtc] = 0x1;
977 if (drm_vblank_get(dev, crtc) == 0)
978 dev->vblank_inmodeset[crtc] |= 0x2;
Dave Airlief453ba02008-11-07 14:05:41 -0800979 }
980}
981EXPORT_SYMBOL(drm_vblank_pre_modeset);
982
983void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
984{
985 unsigned long irqflags;
986
987 if (dev->vblank_inmodeset[crtc]) {
988 spin_lock_irqsave(&dev->vbl_lock, irqflags);
989 dev->vblank_disable_allowed = 1;
Dave Airlief453ba02008-11-07 14:05:41 -0800990 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
Chris Wilsonb3f5e732009-02-19 14:48:22 +0000991
992 if (dev->vblank_inmodeset[crtc] & 0x2)
993 drm_vblank_put(dev, crtc);
994
995 dev->vblank_inmodeset[crtc] = 0;
Dave Airlief453ba02008-11-07 14:05:41 -0800996 }
997}
998EXPORT_SYMBOL(drm_vblank_post_modeset);
999
1000/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001001 * drm_modeset_ctl - handle vblank event counter changes across mode switch
1002 * @DRM_IOCTL_ARGS: standard ioctl arguments
1003 *
1004 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
1005 * ioctls around modesetting so that any lost vblank events are accounted for.
1006 *
1007 * Generally the counter will reset across mode sets. If interrupts are
1008 * enabled around this call, we don't have to do anything since the counter
1009 * will have already been incremented.
1010 */
1011int drm_modeset_ctl(struct drm_device *dev, void *data,
1012 struct drm_file *file_priv)
1013{
1014 struct drm_modeset_ctl *modeset = data;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001015 int crtc, ret = 0;
1016
1017 /* If drm_vblank_init() hasn't been called yet, just no-op */
1018 if (!dev->num_crtcs)
1019 goto out;
1020
1021 crtc = modeset->crtc;
1022 if (crtc >= dev->num_crtcs) {
1023 ret = -EINVAL;
1024 goto out;
1025 }
1026
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001027 switch (modeset->cmd) {
1028 case _DRM_PRE_MODESET:
Dave Airlief453ba02008-11-07 14:05:41 -08001029 drm_vblank_pre_modeset(dev, crtc);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001030 break;
1031 case _DRM_POST_MODESET:
Dave Airlief453ba02008-11-07 14:05:41 -08001032 drm_vblank_post_modeset(dev, crtc);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001033 break;
1034 default:
1035 ret = -EINVAL;
1036 break;
1037 }
1038
1039out:
1040 return ret;
1041}
1042
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001043static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
1044 union drm_wait_vblank *vblwait,
1045 struct drm_file *file_priv)
1046{
1047 struct drm_pending_vblank_event *e;
1048 struct timeval now;
1049 unsigned long flags;
1050 unsigned int seq;
Chris Wilsonea5d5522010-12-01 19:41:31 +00001051 int ret;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001052
1053 e = kzalloc(sizeof *e, GFP_KERNEL);
Chris Wilsonea5d5522010-12-01 19:41:31 +00001054 if (e == NULL) {
1055 ret = -ENOMEM;
1056 goto err_put;
1057 }
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001058
1059 e->pipe = pipe;
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001060 e->base.pid = current->pid;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001061 e->event.base.type = DRM_EVENT_VBLANK;
1062 e->event.base.length = sizeof e->event;
1063 e->event.user_data = vblwait->request.signal;
1064 e->base.event = &e->event.base;
1065 e->base.file_priv = file_priv;
1066 e->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
1067
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001068 spin_lock_irqsave(&dev->event_lock, flags);
1069
1070 if (file_priv->event_space < sizeof e->event) {
Chris Wilsonea5d5522010-12-01 19:41:31 +00001071 ret = -EBUSY;
1072 goto err_unlock;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001073 }
1074
1075 file_priv->event_space -= sizeof e->event;
Mario Kleiner27641c32010-10-23 04:20:23 +02001076 seq = drm_vblank_count_and_time(dev, pipe, &now);
1077
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001078 if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) &&
1079 (seq - vblwait->request.sequence) <= (1 << 23)) {
1080 vblwait->request.sequence = seq + 1;
Jesse Barnes4a921642009-11-10 08:21:25 +00001081 vblwait->reply.sequence = vblwait->request.sequence;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001082 }
1083
1084 DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n",
1085 vblwait->request.sequence, seq, pipe);
1086
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001087 trace_drm_vblank_event_queued(current->pid, pipe,
1088 vblwait->request.sequence);
1089
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001090 e->event.sequence = vblwait->request.sequence;
1091 if ((seq - vblwait->request.sequence) <= (1 << 23)) {
Mario Kleiner000fa7c2010-12-10 16:00:19 +01001092 e->event.sequence = seq;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001093 e->event.tv_sec = now.tv_sec;
1094 e->event.tv_usec = now.tv_usec;
Dan Carpenter6f331622010-12-09 08:35:40 +03001095 drm_vblank_put(dev, pipe);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001096 list_add_tail(&e->base.link, &e->base.file_priv->event_list);
1097 wake_up_interruptible(&e->base.file_priv->event_wait);
Mario Kleiner000fa7c2010-12-10 16:00:19 +01001098 vblwait->reply.sequence = seq;
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001099 trace_drm_vblank_event_delivered(current->pid, pipe,
1100 vblwait->request.sequence);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001101 } else {
1102 list_add_tail(&e->base.link, &dev->vblank_event_list);
Mario Kleiner000fa7c2010-12-10 16:00:19 +01001103 vblwait->reply.sequence = vblwait->request.sequence;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001104 }
1105
1106 spin_unlock_irqrestore(&dev->event_lock, flags);
1107
1108 return 0;
Chris Wilsonea5d5522010-12-01 19:41:31 +00001109
1110err_unlock:
1111 spin_unlock_irqrestore(&dev->event_lock, flags);
1112 kfree(e);
1113err_put:
Dan Carpenter6f331622010-12-09 08:35:40 +03001114 drm_vblank_put(dev, pipe);
Chris Wilsonea5d5522010-12-01 19:41:31 +00001115 return ret;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001116}
1117
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001118/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 * Wait for VBLANK.
1120 *
1121 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +10001122 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 * \param cmd command.
1124 * \param data user argument, pointing to a drm_wait_vblank structure.
1125 * \return zero on success or a negative number on failure.
1126 *
Eric Anholt30b23632009-01-27 21:19:41 -08001127 * This function enables the vblank interrupt on the pipe requested, then
1128 * sleeps waiting for the requested sequence number to occur, and drops
1129 * the vblank interrupt refcount afterwards. (vblank irq disable follows that
1130 * after a timeout with no further vblank waits scheduled).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 */
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001132int drm_wait_vblank(struct drm_device *dev, void *data,
1133 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134{
Eric Anholtc153f452007-09-03 12:06:45 +10001135 union drm_wait_vblank *vblwait = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 int ret = 0;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001137 unsigned int flags, seq, crtc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138
Jordan Crousedcdb1672010-05-27 13:40:25 -06001139 if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 return -EINVAL;
1141
Eric Anholt30b23632009-01-27 21:19:41 -08001142 if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
1143 return -EINVAL;
1144
Eric Anholtc153f452007-09-03 12:06:45 +10001145 if (vblwait->request.type &
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001146 ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
1147 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
Eric Anholtc153f452007-09-03 12:06:45 +10001148 vblwait->request.type,
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001149 (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
1150 return -EINVAL;
1151 }
1152
Eric Anholtc153f452007-09-03 12:06:45 +10001153 flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001154 crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001155
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001156 if (crtc >= dev->num_crtcs)
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001157 return -EINVAL;
1158
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001159 ret = drm_vblank_get(dev, crtc);
1160 if (ret) {
Paul Rolland8d3457e2009-08-09 12:24:01 +10001161 DRM_DEBUG("failed to acquire vblank counter, %d\n", ret);
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001162 return ret;
1163 }
1164 seq = drm_vblank_count(dev, crtc);
=?utf-8?q?Michel_D=C3=A4nzer?=776c9442006-10-24 22:24:38 +10001165
Eric Anholtc153f452007-09-03 12:06:45 +10001166 switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 case _DRM_VBLANK_RELATIVE:
Eric Anholtc153f452007-09-03 12:06:45 +10001168 vblwait->request.sequence += seq;
1169 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 case _DRM_VBLANK_ABSOLUTE:
1171 break;
1172 default:
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001173 ret = -EINVAL;
1174 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 }
1176
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001177 if (flags & _DRM_VBLANK_EVENT)
1178 return drm_queue_vblank_event(dev, crtc, vblwait, file_priv);
1179
=?utf-8?q?Michel_D=C3=A4nzer?=ab285d72006-10-24 23:34:18 +10001180 if ((flags & _DRM_VBLANK_NEXTONMISS) &&
Eric Anholtc153f452007-09-03 12:06:45 +10001181 (seq - vblwait->request.sequence) <= (1<<23)) {
1182 vblwait->request.sequence = seq + 1;
=?utf-8?q?Michel_D=C3=A4nzer?=ab285d72006-10-24 23:34:18 +10001183 }
1184
Eric Anholt30b23632009-01-27 21:19:41 -08001185 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
1186 vblwait->request.sequence, crtc);
1187 dev->last_vblank_wait[crtc] = vblwait->request.sequence;
1188 DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
1189 (((drm_vblank_count(dev, crtc) -
1190 vblwait->request.sequence) <= (1 << 23)) ||
1191 !dev->irq_enabled));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192
Eric Anholt30b23632009-01-27 21:19:41 -08001193 if (ret != -EINTR) {
1194 struct timeval now;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
Mario Kleiner27641c32010-10-23 04:20:23 +02001196 vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now);
Eric Anholt30b23632009-01-27 21:19:41 -08001197 vblwait->reply.tval_sec = now.tv_sec;
1198 vblwait->reply.tval_usec = now.tv_usec;
Mario Kleiner27641c32010-10-23 04:20:23 +02001199
Eric Anholt30b23632009-01-27 21:19:41 -08001200 DRM_DEBUG("returning %d to client\n",
1201 vblwait->reply.sequence);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 } else {
Eric Anholt30b23632009-01-27 21:19:41 -08001203 DRM_DEBUG("vblank wait interrupted by signal\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 }
1205
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001206done:
1207 drm_vblank_put(dev, crtc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 return ret;
1209}
1210
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001211void drm_handle_vblank_events(struct drm_device *dev, int crtc)
1212{
1213 struct drm_pending_vblank_event *e, *t;
1214 struct timeval now;
1215 unsigned long flags;
1216 unsigned int seq;
1217
Mario Kleiner27641c32010-10-23 04:20:23 +02001218 seq = drm_vblank_count_and_time(dev, crtc, &now);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001219
1220 spin_lock_irqsave(&dev->event_lock, flags);
1221
1222 list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
1223 if (e->pipe != crtc)
1224 continue;
1225 if ((seq - e->event.sequence) > (1<<23))
1226 continue;
1227
1228 DRM_DEBUG("vblank event on %d, current %d\n",
1229 e->event.sequence, seq);
1230
1231 e->event.sequence = seq;
1232 e->event.tv_sec = now.tv_sec;
1233 e->event.tv_usec = now.tv_usec;
1234 drm_vblank_put(dev, e->pipe);
1235 list_move_tail(&e->base.link, &e->base.file_priv->event_list);
1236 wake_up_interruptible(&e->base.file_priv->event_wait);
Jesse Barnesb9c2c9a2010-07-01 16:48:09 -07001237 trace_drm_vblank_event_delivered(e->base.pid, e->pipe,
1238 e->event.sequence);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001239 }
1240
1241 spin_unlock_irqrestore(&dev->event_lock, flags);
Jesse Barnesac2874b2010-07-01 16:47:31 -07001242
1243 trace_drm_vblank_event(crtc, seq);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001244}
1245
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246/**
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001247 * drm_handle_vblank - handle a vblank event
1248 * @dev: DRM device
1249 * @crtc: where this event occurred
1250 *
1251 * Drivers should call this routine in their vblank interrupt handlers to
1252 * update the vblank counter and send any signals that may be pending.
1253 */
Chris Wilson78c6e172011-01-31 10:48:04 +00001254bool drm_handle_vblank(struct drm_device *dev, int crtc)
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001255{
Mario Kleiner27641c32010-10-23 04:20:23 +02001256 u32 vblcount;
1257 s64 diff_ns;
1258 struct timeval tvblank;
1259 unsigned long irqflags;
1260
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001261 if (!dev->num_crtcs)
Chris Wilson78c6e172011-01-31 10:48:04 +00001262 return false;
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001263
Mario Kleiner27641c32010-10-23 04:20:23 +02001264 /* Need timestamp lock to prevent concurrent execution with
1265 * vblank enable/disable, as this would cause inconsistent
1266 * or corrupted timestamps and vblank counts.
1267 */
1268 spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
1269
1270 /* Vblank irq handling disabled. Nothing to do. */
1271 if (!dev->vblank_enabled[crtc]) {
1272 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
Chris Wilson78c6e172011-01-31 10:48:04 +00001273 return false;
Mario Kleiner27641c32010-10-23 04:20:23 +02001274 }
1275
1276 /* Fetch corresponding timestamp for this vblank interval from
1277 * driver and store it in proper slot of timestamp ringbuffer.
1278 */
1279
1280 /* Get current timestamp and count. */
1281 vblcount = atomic_read(&dev->_vblank_count[crtc]);
1282 drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ);
1283
1284 /* Compute time difference to timestamp of last vblank */
1285 diff_ns = timeval_to_ns(&tvblank) -
1286 timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
1287
1288 /* Update vblank timestamp and count if at least
1289 * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds
1290 * difference between last stored timestamp and current
1291 * timestamp. A smaller difference means basically
1292 * identical timestamps. Happens if this vblank has
1293 * been already processed and this is a redundant call,
1294 * e.g., due to spurious vblank interrupts. We need to
1295 * ignore those for accounting.
1296 */
Mario Kleinerc4cc3832011-02-21 05:42:00 +01001297 if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) {
Mario Kleiner27641c32010-10-23 04:20:23 +02001298 /* Store new timestamp in ringbuffer. */
1299 vblanktimestamp(dev, crtc, vblcount + 1) = tvblank;
Mario Kleiner27641c32010-10-23 04:20:23 +02001300
1301 /* Increment cooked vblank count. This also atomically commits
1302 * the timestamp computed above.
1303 */
Mario Kleinerbc215122011-02-21 05:42:01 +01001304 smp_mb__before_atomic_inc();
Mario Kleiner27641c32010-10-23 04:20:23 +02001305 atomic_inc(&dev->_vblank_count[crtc]);
Mario Kleinerbc215122011-02-21 05:42:01 +01001306 smp_mb__after_atomic_inc();
Mario Kleiner27641c32010-10-23 04:20:23 +02001307 } else {
1308 DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n",
1309 crtc, (int) diff_ns);
1310 }
1311
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001312 DRM_WAKEUP(&dev->vbl_queue[crtc]);
Kristian Høgsbergc9a9c5e2009-09-12 04:33:34 +10001313 drm_handle_vblank_events(dev, crtc);
Mario Kleiner27641c32010-10-23 04:20:23 +02001314
1315 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
Chris Wilson78c6e172011-01-31 10:48:04 +00001316 return true;
Jesse Barnes0a3e67a2008-09-30 12:14:26 -07001317}
1318EXPORT_SYMBOL(drm_handle_vblank);