5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
10 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
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:
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
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.
37 #include "drm_trace.h"
39 #include <linux/interrupt.h> /* For task queue support */
40 #include <linux/slab.h>
42 #include <linux/vgaarb.h>
43 #include <linux/export.h>
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)])
50 /* Retry timestamp calculation up to 3 times to satisfy
51 * drm_timestamp_precision before giving up.
53 #define DRM_TIMESTAMP_MAXRETRIES 3
55 /* Threshold in nanoseconds for detection of redundant
56 * vblank irq in drm_handle_vblank(). 1 msec should be ok.
58 #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
61 * Get interrupt from bus id.
63 * \param inode device inode.
64 * \param file_priv DRM file private.
66 * \param arg user argument, pointing to a drm_irq_busid structure.
67 * \return zero on success or a negative number on failure.
69 * 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.
73 int drm_irq_by_busid(struct drm_device
*dev
, void *data
,
74 struct drm_file
*file_priv
)
76 struct drm_irq_busid
*p
= data
;
78 if (!dev
->driver
->bus
->irq_by_busid
)
81 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
84 return dev
->driver
->bus
->irq_by_busid(dev
, p
);
88 * Clear vblank timestamp buffer for a crtc.
90 static void clear_vblank_timestamps(struct drm_device
*dev
, int crtc
)
92 memset(&dev
->_vblank_time
[crtc
* DRM_VBLANKTIME_RBSIZE
], 0,
93 DRM_VBLANKTIME_RBSIZE
* sizeof(struct timeval
));
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
102 static void vblank_disable_and_save(struct drm_device
*dev
, int crtc
)
104 unsigned long irqflags
;
108 struct timeval tvblank
;
110 /* Prevent vblank irq processing while disabling vblank irqs,
111 * so no updates of timestamps or count can happen after we've
112 * disabled. Needed to prevent races in case of delayed irq's.
114 spin_lock_irqsave(&dev
->vblank_time_lock
, irqflags
);
116 dev
->driver
->disable_vblank(dev
, crtc
);
117 dev
->vblank_enabled
[crtc
] = 0;
119 /* No further vblank irq's will be processed after
120 * this point. Get current hardware vblank count and
121 * vblank timestamp, repeat until they are consistent.
123 * FIXME: There is still a race condition here and in
124 * drm_update_vblank_count() which can cause off-by-one
125 * reinitialization of software vblank counter. If gpu
126 * vblank counter doesn't increment exactly at the leading
127 * edge of a vblank interval, then we can lose 1 count if
128 * we happen to execute between start of vblank and the
129 * delayed gpu counter increment.
132 dev
->last_vblank
[crtc
] = dev
->driver
->get_vblank_counter(dev
, crtc
);
133 vblrc
= drm_get_last_vbltimestamp(dev
, crtc
, &tvblank
, 0);
134 } while (dev
->last_vblank
[crtc
] != dev
->driver
->get_vblank_counter(dev
, crtc
));
136 /* Compute time difference to stored timestamp of last vblank
137 * as updated by last invocation of drm_handle_vblank() in vblank irq.
139 vblcount
= atomic_read(&dev
->_vblank_count
[crtc
]);
140 diff_ns
= timeval_to_ns(&tvblank
) -
141 timeval_to_ns(&vblanktimestamp(dev
, crtc
, vblcount
));
143 /* If there is at least 1 msec difference between the last stored
144 * timestamp and tvblank, then we are currently executing our
145 * disable inside a new vblank interval, the tvblank timestamp
146 * corresponds to this new vblank interval and the irq handler
147 * for this vblank didn't run yet and won't run due to our disable.
148 * Therefore we need to do the job of drm_handle_vblank() and
149 * increment the vblank counter by one to account for this vblank.
151 * Skip this step if there isn't any high precision timestamp
152 * available. In that case we can't account for this and just
155 if ((vblrc
> 0) && (abs64(diff_ns
) > 1000000)) {
156 atomic_inc(&dev
->_vblank_count
[crtc
]);
157 smp_mb__after_atomic_inc();
160 /* Invalidate all timestamps while vblank irq's are off. */
161 clear_vblank_timestamps(dev
, crtc
);
163 spin_unlock_irqrestore(&dev
->vblank_time_lock
, irqflags
);
166 static void vblank_disable_fn(unsigned long arg
)
168 struct drm_device
*dev
= (struct drm_device
*)arg
;
169 unsigned long irqflags
;
172 if (!dev
->vblank_disable_allowed
)
175 for (i
= 0; i
< dev
->num_crtcs
; i
++) {
176 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
177 if (atomic_read(&dev
->vblank_refcount
[i
]) == 0 &&
178 dev
->vblank_enabled
[i
]) {
179 DRM_DEBUG("disabling vblank on crtc %d\n", i
);
180 vblank_disable_and_save(dev
, i
);
182 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
186 void drm_vblank_cleanup(struct drm_device
*dev
)
188 /* Bail if the driver didn't call drm_vblank_init() */
189 if (dev
->num_crtcs
== 0)
192 del_timer_sync(&dev
->vblank_disable_timer
);
194 vblank_disable_fn((unsigned long)dev
);
196 kfree(dev
->vbl_queue
);
197 kfree(dev
->_vblank_count
);
198 kfree(dev
->vblank_refcount
);
199 kfree(dev
->vblank_enabled
);
200 kfree(dev
->last_vblank
);
201 kfree(dev
->last_vblank_wait
);
202 kfree(dev
->vblank_inmodeset
);
203 kfree(dev
->_vblank_time
);
207 EXPORT_SYMBOL(drm_vblank_cleanup
);
209 int drm_vblank_init(struct drm_device
*dev
, int num_crtcs
)
211 int i
, ret
= -ENOMEM
;
213 setup_timer(&dev
->vblank_disable_timer
, vblank_disable_fn
,
215 spin_lock_init(&dev
->vbl_lock
);
216 spin_lock_init(&dev
->vblank_time_lock
);
218 dev
->num_crtcs
= num_crtcs
;
220 dev
->vbl_queue
= kmalloc(sizeof(wait_queue_head_t
) * num_crtcs
,
225 dev
->_vblank_count
= kmalloc(sizeof(atomic_t
) * num_crtcs
, GFP_KERNEL
);
226 if (!dev
->_vblank_count
)
229 dev
->vblank_refcount
= kmalloc(sizeof(atomic_t
) * num_crtcs
,
231 if (!dev
->vblank_refcount
)
234 dev
->vblank_enabled
= kcalloc(num_crtcs
, sizeof(int), GFP_KERNEL
);
235 if (!dev
->vblank_enabled
)
238 dev
->last_vblank
= kcalloc(num_crtcs
, sizeof(u32
), GFP_KERNEL
);
239 if (!dev
->last_vblank
)
242 dev
->last_vblank_wait
= kcalloc(num_crtcs
, sizeof(u32
), GFP_KERNEL
);
243 if (!dev
->last_vblank_wait
)
246 dev
->vblank_inmodeset
= kcalloc(num_crtcs
, sizeof(int), GFP_KERNEL
);
247 if (!dev
->vblank_inmodeset
)
250 dev
->_vblank_time
= kcalloc(num_crtcs
* DRM_VBLANKTIME_RBSIZE
,
251 sizeof(struct timeval
), GFP_KERNEL
);
252 if (!dev
->_vblank_time
)
255 DRM_INFO("Supports vblank timestamp caching Rev 1 (10.10.2010).\n");
257 /* Driver specific high-precision vblank timestamping supported? */
258 if (dev
->driver
->get_vblank_timestamp
)
259 DRM_INFO("Driver supports precise vblank timestamp query.\n");
261 DRM_INFO("No driver support for vblank timestamp query.\n");
263 /* Zero per-crtc vblank stuff */
264 for (i
= 0; i
< num_crtcs
; i
++) {
265 init_waitqueue_head(&dev
->vbl_queue
[i
]);
266 atomic_set(&dev
->_vblank_count
[i
], 0);
267 atomic_set(&dev
->vblank_refcount
[i
], 0);
270 dev
->vblank_disable_allowed
= 0;
274 drm_vblank_cleanup(dev
);
277 EXPORT_SYMBOL(drm_vblank_init
);
279 static void drm_irq_vgaarb_nokms(void *cookie
, bool state
)
281 struct drm_device
*dev
= cookie
;
283 if (dev
->driver
->vgaarb_irq
) {
284 dev
->driver
->vgaarb_irq(dev
, state
);
288 if (!dev
->irq_enabled
)
292 if (dev
->driver
->irq_uninstall
)
293 dev
->driver
->irq_uninstall(dev
);
295 if (dev
->driver
->irq_preinstall
)
296 dev
->driver
->irq_preinstall(dev
);
297 if (dev
->driver
->irq_postinstall
)
298 dev
->driver
->irq_postinstall(dev
);
303 * Install IRQ handler.
305 * \param dev DRM device.
307 * Initializes the IRQ related data. Installs the handler, calling the driver
308 * \c irq_preinstall() and \c irq_postinstall() functions
309 * before and after the installation.
311 int drm_irq_install(struct drm_device
*dev
)
314 unsigned long sh_flags
= 0;
317 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
320 if (drm_dev_to_irq(dev
) == 0)
323 mutex_lock(&dev
->struct_mutex
);
325 /* Driver must have been initialized */
326 if (!dev
->dev_private
) {
327 mutex_unlock(&dev
->struct_mutex
);
331 if (dev
->irq_enabled
) {
332 mutex_unlock(&dev
->struct_mutex
);
335 dev
->irq_enabled
= 1;
336 mutex_unlock(&dev
->struct_mutex
);
338 DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev
));
340 /* Before installing handler */
341 if (dev
->driver
->irq_preinstall
)
342 dev
->driver
->irq_preinstall(dev
);
344 /* Install handler */
345 if (drm_core_check_feature(dev
, DRIVER_IRQ_SHARED
))
346 sh_flags
= IRQF_SHARED
;
349 irqname
= dev
->devname
;
351 irqname
= dev
->driver
->name
;
353 ret
= request_irq(drm_dev_to_irq(dev
), dev
->driver
->irq_handler
,
354 sh_flags
, irqname
, dev
);
357 mutex_lock(&dev
->struct_mutex
);
358 dev
->irq_enabled
= 0;
359 mutex_unlock(&dev
->struct_mutex
);
363 if (!drm_core_check_feature(dev
, DRIVER_MODESET
))
364 vga_client_register(dev
->pdev
, (void *)dev
, drm_irq_vgaarb_nokms
, NULL
);
366 /* After installing handler */
367 if (dev
->driver
->irq_postinstall
)
368 ret
= dev
->driver
->irq_postinstall(dev
);
371 mutex_lock(&dev
->struct_mutex
);
372 dev
->irq_enabled
= 0;
373 mutex_unlock(&dev
->struct_mutex
);
374 if (!drm_core_check_feature(dev
, DRIVER_MODESET
))
375 vga_client_register(dev
->pdev
, NULL
, NULL
, NULL
);
376 free_irq(drm_dev_to_irq(dev
), dev
);
381 EXPORT_SYMBOL(drm_irq_install
);
384 * Uninstall the IRQ handler.
386 * \param dev DRM device.
388 * Calls the driver's \c irq_uninstall() function, and stops the irq.
390 int drm_irq_uninstall(struct drm_device
*dev
)
392 unsigned long irqflags
;
395 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
398 mutex_lock(&dev
->struct_mutex
);
399 irq_enabled
= dev
->irq_enabled
;
400 dev
->irq_enabled
= 0;
401 mutex_unlock(&dev
->struct_mutex
);
404 * Wake up any waiters so they don't hang.
406 if (dev
->num_crtcs
) {
407 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
408 for (i
= 0; i
< dev
->num_crtcs
; i
++) {
409 DRM_WAKEUP(&dev
->vbl_queue
[i
]);
410 dev
->vblank_enabled
[i
] = 0;
411 dev
->last_vblank
[i
] =
412 dev
->driver
->get_vblank_counter(dev
, i
);
414 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
420 DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev
));
422 if (!drm_core_check_feature(dev
, DRIVER_MODESET
))
423 vga_client_register(dev
->pdev
, NULL
, NULL
, NULL
);
425 if (dev
->driver
->irq_uninstall
)
426 dev
->driver
->irq_uninstall(dev
);
428 free_irq(drm_dev_to_irq(dev
), dev
);
432 EXPORT_SYMBOL(drm_irq_uninstall
);
437 * \param inode device inode.
438 * \param file_priv DRM file private.
439 * \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.
443 * Calls irq_install() or irq_uninstall() according to \p arg.
445 int drm_control(struct drm_device
*dev
, void *data
,
446 struct drm_file
*file_priv
)
448 struct drm_control
*ctl
= data
;
450 /* if we haven't irq we fallback for compatibility reasons -
451 * this used to be a separate function in drm_dma.h
456 case DRM_INST_HANDLER
:
457 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
459 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
461 if (dev
->if_version
< DRM_IF_VERSION(1, 2) &&
462 ctl
->irq
!= drm_dev_to_irq(dev
))
464 return drm_irq_install(dev
);
465 case DRM_UNINST_HANDLER
:
466 if (!drm_core_check_feature(dev
, DRIVER_HAVE_IRQ
))
468 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
470 return drm_irq_uninstall(dev
);
477 * 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.
485 * @crtc drm_crtc whose timestamp constants should be updated.
488 void drm_calc_timestamping_constants(struct drm_crtc
*crtc
)
490 s64 linedur_ns
= 0, pixeldur_ns
= 0, framedur_ns
= 0;
493 /* Dot clock in Hz: */
494 dotclock
= (u64
) crtc
->hwmode
.clock
* 1000;
496 /* Fields of interlaced scanout modes are only halve a frame duration.
497 * Double the dotclock to get halve the frame-/line-/pixelduration.
499 if (crtc
->hwmode
.flags
& DRM_MODE_FLAG_INTERLACE
)
502 /* Valid dotclock? */
504 /* Convert scanline length in pixels and video dot clock to
505 * line duration, frame duration and pixel duration in
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
;
513 DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n",
516 crtc
->pixeldur_ns
= pixeldur_ns
;
517 crtc
->linedur_ns
= linedur_ns
;
518 crtc
->framedur_ns
= framedur_ns
;
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
);
527 EXPORT_SYMBOL(drm_calc_timestamping_constants
);
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.
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.
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.
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.
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:
556 * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler.
557 * @refcrtc: drm_crtc* of crtc which defines scanout timing.
559 * Returns negative value on error, failure or if not supported in current
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.
567 * Returns or'ed positive status flags on success:
569 * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.
570 * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.
573 int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device
*dev
, int crtc
,
575 struct timeval
*vblank_time
,
577 struct drm_crtc
*refcrtc
)
579 ktime_t stime
, etime
, mono_time_offset
;
580 struct timeval tv_etime
;
581 struct drm_display_mode
*mode
;
582 int vbl_status
, vtotal
, vdisplay
;
584 s64 framedur_ns
, linedur_ns
, pixeldur_ns
, delta_ns
, duration_ns
;
587 if (crtc
< 0 || crtc
>= dev
->num_crtcs
) {
588 DRM_ERROR("Invalid crtc %d\n", crtc
);
592 /* Scanout position query not supported? Should not happen. */
593 if (!dev
->driver
->get_scanout_position
) {
594 DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
598 mode
= &refcrtc
->hwmode
;
599 vtotal
= mode
->crtc_vtotal
;
600 vdisplay
= mode
->crtc_vdisplay
;
602 /* Durations of frames, lines, pixels in nanoseconds. */
603 framedur_ns
= refcrtc
->framedur_ns
;
604 linedur_ns
= refcrtc
->linedur_ns
;
605 pixeldur_ns
= refcrtc
->pixeldur_ns
;
607 /* If mode timing undefined, just return as no-op:
608 * Happens during initial modesetting of a crtc.
610 if (vtotal
<= 0 || vdisplay
<= 0 || framedur_ns
== 0) {
611 DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc
);
615 /* Get current scanout position with system timestamp.
616 * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times
617 * if single query takes longer than max_error nanoseconds.
619 * This guarantees a tight bound on maximum error if
620 * code gets preempted or delayed for some reason.
622 for (i
= 0; i
< DRM_TIMESTAMP_MAXRETRIES
; i
++) {
623 /* Disable preemption to make it very likely to
624 * succeed in the first iteration even on PREEMPT_RT kernel.
628 /* Get system timestamp before query. */
631 /* Get vertical and horizontal scanout pos. vpos, hpos. */
632 vbl_status
= dev
->driver
->get_scanout_position(dev
, crtc
, &vpos
, &hpos
);
634 /* Get system timestamp after query. */
636 if (!drm_timestamp_monotonic
)
637 mono_time_offset
= ktime_get_monotonic_offset();
641 /* Return as no-op if scanout query unsupported or failed. */
642 if (!(vbl_status
& DRM_SCANOUTPOS_VALID
)) {
643 DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n",
648 duration_ns
= ktime_to_ns(etime
) - ktime_to_ns(stime
);
650 /* Accept result with < max_error nsecs timing uncertainty. */
651 if (duration_ns
<= (s64
) *max_error
)
655 /* Noisy system timing? */
656 if (i
== DRM_TIMESTAMP_MAXRETRIES
) {
657 DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n",
658 crtc
, (int) duration_ns
/1000, *max_error
/1000, i
);
661 /* Return upper bound of timestamp precision error. */
662 *max_error
= (int) duration_ns
;
664 /* Check if in vblank area:
665 * vpos is >=0 in video scanout area, but negative
666 * within vblank area, counting down the number of lines until
669 invbl
= vbl_status
& DRM_SCANOUTPOS_INVBL
;
671 /* Convert scanout position into elapsed time at raw_time query
672 * since start of scanout at first display scanline. delta_ns
673 * can be negative if start of scanout hasn't happened yet.
675 delta_ns
= (s64
) vpos
* linedur_ns
+ (s64
) hpos
* pixeldur_ns
;
677 /* Is vpos outside nominal vblank area, but less than
678 * 1/100 of a frame height away from start of vblank?
679 * If so, assume this isn't a massively delayed vblank
680 * interrupt, but a vblank interrupt that fired a few
681 * microseconds before true start of vblank. Compensate
682 * by adding a full frame duration to the final timestamp.
683 * Happens, e.g., on ATI R500, R600.
685 * We only do this if DRM_CALLED_FROM_VBLIRQ.
687 if ((flags
& DRM_CALLED_FROM_VBLIRQ
) && !invbl
&&
688 ((vdisplay
- vpos
) < vtotal
/ 100)) {
689 delta_ns
= delta_ns
- framedur_ns
;
691 /* Signal this correction as "applied". */
695 if (!drm_timestamp_monotonic
)
696 etime
= ktime_sub(etime
, mono_time_offset
);
698 /* save this only for debugging purposes */
699 tv_etime
= ktime_to_timeval(etime
);
700 /* Subtract time delta from raw timestamp to get final
701 * vblank_time timestamp for end of vblank.
703 etime
= ktime_sub_ns(etime
, delta_ns
);
704 *vblank_time
= ktime_to_timeval(etime
);
706 DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",
707 crtc
, (int)vbl_status
, hpos
, vpos
,
708 (long)tv_etime
.tv_sec
, (long)tv_etime
.tv_usec
,
709 (long)vblank_time
->tv_sec
, (long)vblank_time
->tv_usec
,
710 (int)duration_ns
/1000, i
);
712 vbl_status
= DRM_VBLANKTIME_SCANOUTPOS_METHOD
;
714 vbl_status
|= DRM_VBLANKTIME_INVBL
;
718 EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos
);
720 static struct timeval
get_drm_timestamp(void)
725 if (!drm_timestamp_monotonic
)
726 now
= ktime_sub(now
, ktime_get_monotonic_offset());
728 return ktime_to_timeval(now
);
732 * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent
736 * @crtc: which crtc's vblank timestamp to retrieve
737 * @tvblank: Pointer to target struct timeval which should receive the timestamp
738 * @flags: Flags to pass to driver:
740 * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler.
742 * Fetches the system timestamp corresponding to the time of the most recent
743 * vblank interval on specified crtc. May call into kms-driver to
744 * compute the timestamp with a high-precision GPU specific method.
746 * Returns zero if timestamp originates from uncorrected do_gettimeofday()
747 * call, i.e., it isn't very precisely locked to the true vblank.
749 * Returns non-zero if timestamp is considered to be very precise.
751 u32
drm_get_last_vbltimestamp(struct drm_device
*dev
, int crtc
,
752 struct timeval
*tvblank
, unsigned flags
)
756 /* Define requested maximum error on timestamps (nanoseconds). */
757 int max_error
= (int) drm_timestamp_precision
* 1000;
759 /* Query driver if possible and precision timestamping enabled. */
760 if (dev
->driver
->get_vblank_timestamp
&& (max_error
> 0)) {
761 ret
= dev
->driver
->get_vblank_timestamp(dev
, crtc
, &max_error
,
767 /* GPU high precision timestamp query unsupported or failed.
768 * Return current monotonic/gettimeofday timestamp as best estimate.
770 *tvblank
= get_drm_timestamp();
774 EXPORT_SYMBOL(drm_get_last_vbltimestamp
);
777 * drm_vblank_count - retrieve "cooked" vblank counter value
779 * @crtc: which counter to retrieve
781 * Fetches the "cooked" vblank count value that represents the number of
782 * vblank events since the system was booted, including lost events due to
783 * modesetting activity.
785 u32
drm_vblank_count(struct drm_device
*dev
, int crtc
)
787 return atomic_read(&dev
->_vblank_count
[crtc
]);
789 EXPORT_SYMBOL(drm_vblank_count
);
792 * drm_vblank_count_and_time - retrieve "cooked" vblank counter value
793 * and the system timestamp corresponding to that vblank counter value.
796 * @crtc: which counter to retrieve
797 * @vblanktime: Pointer to struct timeval to receive the vblank timestamp.
799 * Fetches the "cooked" vblank count value that represents the number of
800 * vblank events since the system was booted, including lost events due to
801 * modesetting activity. Returns corresponding system timestamp of the time
802 * of the vblank interval that corresponds to the current value vblank counter
805 u32
drm_vblank_count_and_time(struct drm_device
*dev
, int crtc
,
806 struct timeval
*vblanktime
)
810 /* Read timestamp from slot of _vblank_time ringbuffer
811 * that corresponds to current vblank count. Retry if
812 * count has incremented during readout. This works like
816 cur_vblank
= atomic_read(&dev
->_vblank_count
[crtc
]);
817 *vblanktime
= vblanktimestamp(dev
, crtc
, cur_vblank
);
819 } while (cur_vblank
!= atomic_read(&dev
->_vblank_count
[crtc
]));
823 EXPORT_SYMBOL(drm_vblank_count_and_time
);
825 static void send_vblank_event(struct drm_device
*dev
,
826 struct drm_pending_vblank_event
*e
,
827 unsigned long seq
, struct timeval
*now
)
829 WARN_ON_SMP(!spin_is_locked(&dev
->event_lock
));
830 e
->event
.sequence
= seq
;
831 e
->event
.tv_sec
= now
->tv_sec
;
832 e
->event
.tv_usec
= now
->tv_usec
;
834 list_add_tail(&e
->base
.link
,
835 &e
->base
.file_priv
->event_list
);
836 wake_up_interruptible(&e
->base
.file_priv
->event_wait
);
837 trace_drm_vblank_event_delivered(e
->base
.pid
, e
->pipe
,
842 * drm_send_vblank_event - helper to send vblank event after pageflip
844 * @crtc: CRTC in question
845 * @e: the event to send
847 * Updates sequence # and timestamp on event, and sends it to userspace.
848 * Caller must hold event lock.
850 void drm_send_vblank_event(struct drm_device
*dev
, int crtc
,
851 struct drm_pending_vblank_event
*e
)
856 seq
= drm_vblank_count_and_time(dev
, crtc
, &now
);
860 now
= get_drm_timestamp();
862 send_vblank_event(dev
, e
, seq
, &now
);
864 EXPORT_SYMBOL(drm_send_vblank_event
);
867 * drm_update_vblank_count - update the master vblank counter
869 * @crtc: counter to update
871 * Call back into the driver to update the appropriate vblank counter
872 * (specified by @crtc). Deal with wraparound, if it occurred, and
873 * update the last read value so we can deal with wraparound on the next
876 * Only necessary when going from off->on, to account for frames we
877 * didn't get an interrupt for.
879 * Note: caller must hold dev->vbl_lock since this reads & writes
880 * device vblank fields.
882 static void drm_update_vblank_count(struct drm_device
*dev
, int crtc
)
884 u32 cur_vblank
, diff
, tslot
, rc
;
885 struct timeval t_vblank
;
888 * Interrupts were disabled prior to this call, so deal with counter
890 * NOTE! It's possible we lost a full dev->max_vblank_count events
891 * here if the register is small or we had vblank interrupts off for
894 * We repeat the hardware vblank counter & timestamp query until
895 * we get consistent results. This to prevent races between gpu
896 * updating its hardware counter while we are retrieving the
897 * corresponding vblank timestamp.
900 cur_vblank
= dev
->driver
->get_vblank_counter(dev
, crtc
);
901 rc
= drm_get_last_vbltimestamp(dev
, crtc
, &t_vblank
, 0);
902 } while (cur_vblank
!= dev
->driver
->get_vblank_counter(dev
, crtc
));
904 /* Deal with counter wrap */
905 diff
= cur_vblank
- dev
->last_vblank
[crtc
];
906 if (cur_vblank
< dev
->last_vblank
[crtc
]) {
907 diff
+= dev
->max_vblank_count
;
909 DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
910 crtc
, dev
->last_vblank
[crtc
], cur_vblank
, diff
);
913 DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
916 /* Reinitialize corresponding vblank timestamp if high-precision query
917 * available. Skip this step if query unsupported or failed. Will
918 * reinitialize delayed at next vblank interrupt in that case.
921 tslot
= atomic_read(&dev
->_vblank_count
[crtc
]) + diff
;
922 vblanktimestamp(dev
, crtc
, tslot
) = t_vblank
;
925 smp_mb__before_atomic_inc();
926 atomic_add(diff
, &dev
->_vblank_count
[crtc
]);
927 smp_mb__after_atomic_inc();
931 * drm_vblank_get - get a reference count on vblank events
933 * @crtc: which CRTC to own
935 * Acquire a reference count on vblank events to avoid having them disabled
939 * Zero on success, nonzero on failure.
941 int drm_vblank_get(struct drm_device
*dev
, int crtc
)
943 unsigned long irqflags
, irqflags2
;
946 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
947 /* Going from 0->1 means we have to enable interrupts again */
948 if (atomic_add_return(1, &dev
->vblank_refcount
[crtc
]) == 1) {
949 spin_lock_irqsave(&dev
->vblank_time_lock
, irqflags2
);
950 if (!dev
->vblank_enabled
[crtc
]) {
951 /* Enable vblank irqs under vblank_time_lock protection.
952 * All vblank count & timestamp updates are held off
953 * until we are done reinitializing master counter and
954 * timestamps. Filtercode in drm_handle_vblank() will
955 * prevent double-accounting of same vblank interval.
957 ret
= dev
->driver
->enable_vblank(dev
, crtc
);
958 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n",
961 atomic_dec(&dev
->vblank_refcount
[crtc
]);
963 dev
->vblank_enabled
[crtc
] = 1;
964 drm_update_vblank_count(dev
, crtc
);
967 spin_unlock_irqrestore(&dev
->vblank_time_lock
, irqflags2
);
969 if (!dev
->vblank_enabled
[crtc
]) {
970 atomic_dec(&dev
->vblank_refcount
[crtc
]);
974 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
978 EXPORT_SYMBOL(drm_vblank_get
);
981 * drm_vblank_put - give up ownership of vblank events
983 * @crtc: which counter to give up
985 * Release ownership of a given vblank counter, turning off interrupts
986 * if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
988 void drm_vblank_put(struct drm_device
*dev
, int crtc
)
990 BUG_ON(atomic_read(&dev
->vblank_refcount
[crtc
]) == 0);
992 /* Last user schedules interrupt disable */
993 if (atomic_dec_and_test(&dev
->vblank_refcount
[crtc
]) &&
994 (drm_vblank_offdelay
> 0))
995 mod_timer(&dev
->vblank_disable_timer
,
996 jiffies
+ ((drm_vblank_offdelay
* DRM_HZ
)/1000));
998 EXPORT_SYMBOL(drm_vblank_put
);
1001 * drm_vblank_off - disable vblank events on a CRTC
1003 * @crtc: CRTC in question
1005 * Caller must hold event lock.
1007 void drm_vblank_off(struct drm_device
*dev
, int crtc
)
1009 struct drm_pending_vblank_event
*e
, *t
;
1011 unsigned long irqflags
;
1014 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
1015 vblank_disable_and_save(dev
, crtc
);
1016 DRM_WAKEUP(&dev
->vbl_queue
[crtc
]);
1018 /* Send any queued vblank events, lest the natives grow disquiet */
1019 seq
= drm_vblank_count_and_time(dev
, crtc
, &now
);
1020 list_for_each_entry_safe(e
, t
, &dev
->vblank_event_list
, base
.link
) {
1021 if (e
->pipe
!= crtc
)
1023 DRM_DEBUG("Sending premature vblank event on disable: \
1024 wanted %d, current %d\n",
1025 e
->event
.sequence
, seq
);
1026 list_del(&e
->base
.link
);
1027 drm_vblank_put(dev
, e
->pipe
);
1028 send_vblank_event(dev
, e
, seq
, &now
);
1031 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
1033 EXPORT_SYMBOL(drm_vblank_off
);
1036 * drm_vblank_pre_modeset - account for vblanks across mode sets
1038 * @crtc: CRTC in question
1040 * Account for vblank events across mode setting events, which will likely
1041 * reset the hardware frame counter.
1043 void drm_vblank_pre_modeset(struct drm_device
*dev
, int crtc
)
1045 /* vblank is not initialized (IRQ not installed ?) */
1046 if (!dev
->num_crtcs
)
1049 * To avoid all the problems that might happen if interrupts
1050 * were enabled/disabled around or between these calls, we just
1051 * have the kernel take a reference on the CRTC (just once though
1052 * to avoid corrupting the count if multiple, mismatch calls occur),
1053 * so that interrupts remain enabled in the interim.
1055 if (!dev
->vblank_inmodeset
[crtc
]) {
1056 dev
->vblank_inmodeset
[crtc
] = 0x1;
1057 if (drm_vblank_get(dev
, crtc
) == 0)
1058 dev
->vblank_inmodeset
[crtc
] |= 0x2;
1061 EXPORT_SYMBOL(drm_vblank_pre_modeset
);
1063 void drm_vblank_post_modeset(struct drm_device
*dev
, int crtc
)
1065 unsigned long irqflags
;
1067 if (dev
->vblank_inmodeset
[crtc
]) {
1068 spin_lock_irqsave(&dev
->vbl_lock
, irqflags
);
1069 dev
->vblank_disable_allowed
= 1;
1070 spin_unlock_irqrestore(&dev
->vbl_lock
, irqflags
);
1072 if (dev
->vblank_inmodeset
[crtc
] & 0x2)
1073 drm_vblank_put(dev
, crtc
);
1075 dev
->vblank_inmodeset
[crtc
] = 0;
1078 EXPORT_SYMBOL(drm_vblank_post_modeset
);
1081 * drm_modeset_ctl - handle vblank event counter changes across mode switch
1082 * @DRM_IOCTL_ARGS: standard ioctl arguments
1084 * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
1085 * ioctls around modesetting so that any lost vblank events are accounted for.
1087 * Generally the counter will reset across mode sets. If interrupts are
1088 * enabled around this call, we don't have to do anything since the counter
1089 * will have already been incremented.
1091 int drm_modeset_ctl(struct drm_device
*dev
, void *data
,
1092 struct drm_file
*file_priv
)
1094 struct drm_modeset_ctl
*modeset
= data
;
1097 /* If drm_vblank_init() hasn't been called yet, just no-op */
1098 if (!dev
->num_crtcs
)
1101 /* KMS drivers handle this internally */
1102 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
1105 crtc
= modeset
->crtc
;
1106 if (crtc
>= dev
->num_crtcs
)
1109 switch (modeset
->cmd
) {
1110 case _DRM_PRE_MODESET
:
1111 drm_vblank_pre_modeset(dev
, crtc
);
1113 case _DRM_POST_MODESET
:
1114 drm_vblank_post_modeset(dev
, crtc
);
1123 static int drm_queue_vblank_event(struct drm_device
*dev
, int pipe
,
1124 union drm_wait_vblank
*vblwait
,
1125 struct drm_file
*file_priv
)
1127 struct drm_pending_vblank_event
*e
;
1129 unsigned long flags
;
1133 e
= kzalloc(sizeof *e
, GFP_KERNEL
);
1140 e
->base
.pid
= current
->pid
;
1141 e
->event
.base
.type
= DRM_EVENT_VBLANK
;
1142 e
->event
.base
.length
= sizeof e
->event
;
1143 e
->event
.user_data
= vblwait
->request
.signal
;
1144 e
->base
.event
= &e
->event
.base
;
1145 e
->base
.file_priv
= file_priv
;
1146 e
->base
.destroy
= (void (*) (struct drm_pending_event
*)) kfree
;
1148 spin_lock_irqsave(&dev
->event_lock
, flags
);
1150 if (file_priv
->event_space
< sizeof e
->event
) {
1155 file_priv
->event_space
-= sizeof e
->event
;
1156 seq
= drm_vblank_count_and_time(dev
, pipe
, &now
);
1158 if ((vblwait
->request
.type
& _DRM_VBLANK_NEXTONMISS
) &&
1159 (seq
- vblwait
->request
.sequence
) <= (1 << 23)) {
1160 vblwait
->request
.sequence
= seq
+ 1;
1161 vblwait
->reply
.sequence
= vblwait
->request
.sequence
;
1164 DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n",
1165 vblwait
->request
.sequence
, seq
, pipe
);
1167 trace_drm_vblank_event_queued(current
->pid
, pipe
,
1168 vblwait
->request
.sequence
);
1170 e
->event
.sequence
= vblwait
->request
.sequence
;
1171 if ((seq
- vblwait
->request
.sequence
) <= (1 << 23)) {
1172 drm_vblank_put(dev
, pipe
);
1173 send_vblank_event(dev
, e
, seq
, &now
);
1174 vblwait
->reply
.sequence
= seq
;
1176 /* drm_handle_vblank_events will call drm_vblank_put */
1177 list_add_tail(&e
->base
.link
, &dev
->vblank_event_list
);
1178 vblwait
->reply
.sequence
= vblwait
->request
.sequence
;
1181 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
1186 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
1189 drm_vblank_put(dev
, pipe
);
1196 * \param inode device inode.
1197 * \param file_priv DRM file private.
1198 * \param cmd command.
1199 * \param data user argument, pointing to a drm_wait_vblank structure.
1200 * \return zero on success or a negative number on failure.
1202 * This function enables the vblank interrupt on the pipe requested, then
1203 * sleeps waiting for the requested sequence number to occur, and drops
1204 * the vblank interrupt refcount afterwards. (vblank irq disable follows that
1205 * after a timeout with no further vblank waits scheduled).
1207 int drm_wait_vblank(struct drm_device
*dev
, void *data
,
1208 struct drm_file
*file_priv
)
1210 union drm_wait_vblank
*vblwait
= data
;
1212 unsigned int flags
, seq
, crtc
, high_crtc
;
1214 if ((!drm_dev_to_irq(dev
)) || (!dev
->irq_enabled
))
1217 if (vblwait
->request
.type
& _DRM_VBLANK_SIGNAL
)
1220 if (vblwait
->request
.type
&
1221 ~(_DRM_VBLANK_TYPES_MASK
| _DRM_VBLANK_FLAGS_MASK
|
1222 _DRM_VBLANK_HIGH_CRTC_MASK
)) {
1223 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
1224 vblwait
->request
.type
,
1225 (_DRM_VBLANK_TYPES_MASK
| _DRM_VBLANK_FLAGS_MASK
|
1226 _DRM_VBLANK_HIGH_CRTC_MASK
));
1230 flags
= vblwait
->request
.type
& _DRM_VBLANK_FLAGS_MASK
;
1231 high_crtc
= (vblwait
->request
.type
& _DRM_VBLANK_HIGH_CRTC_MASK
);
1233 crtc
= high_crtc
>> _DRM_VBLANK_HIGH_CRTC_SHIFT
;
1235 crtc
= flags
& _DRM_VBLANK_SECONDARY
? 1 : 0;
1236 if (crtc
>= dev
->num_crtcs
)
1239 ret
= drm_vblank_get(dev
, crtc
);
1241 DRM_DEBUG("failed to acquire vblank counter, %d\n", ret
);
1244 seq
= drm_vblank_count(dev
, crtc
);
1246 switch (vblwait
->request
.type
& _DRM_VBLANK_TYPES_MASK
) {
1247 case _DRM_VBLANK_RELATIVE
:
1248 vblwait
->request
.sequence
+= seq
;
1249 vblwait
->request
.type
&= ~_DRM_VBLANK_RELATIVE
;
1250 case _DRM_VBLANK_ABSOLUTE
:
1257 if (flags
& _DRM_VBLANK_EVENT
) {
1258 /* must hold on to the vblank ref until the event fires
1259 * drm_vblank_put will be called asynchronously
1261 return drm_queue_vblank_event(dev
, crtc
, vblwait
, file_priv
);
1264 if ((flags
& _DRM_VBLANK_NEXTONMISS
) &&
1265 (seq
- vblwait
->request
.sequence
) <= (1<<23)) {
1266 vblwait
->request
.sequence
= seq
+ 1;
1269 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
1270 vblwait
->request
.sequence
, crtc
);
1271 dev
->last_vblank_wait
[crtc
] = vblwait
->request
.sequence
;
1272 DRM_WAIT_ON(ret
, dev
->vbl_queue
[crtc
], 3 * DRM_HZ
,
1273 (((drm_vblank_count(dev
, crtc
) -
1274 vblwait
->request
.sequence
) <= (1 << 23)) ||
1275 !dev
->irq_enabled
));
1277 if (ret
!= -EINTR
) {
1280 vblwait
->reply
.sequence
= drm_vblank_count_and_time(dev
, crtc
, &now
);
1281 vblwait
->reply
.tval_sec
= now
.tv_sec
;
1282 vblwait
->reply
.tval_usec
= now
.tv_usec
;
1284 DRM_DEBUG("returning %d to client\n",
1285 vblwait
->reply
.sequence
);
1287 DRM_DEBUG("vblank wait interrupted by signal\n");
1291 drm_vblank_put(dev
, crtc
);
1295 static void drm_handle_vblank_events(struct drm_device
*dev
, int crtc
)
1297 struct drm_pending_vblank_event
*e
, *t
;
1299 unsigned long flags
;
1302 seq
= drm_vblank_count_and_time(dev
, crtc
, &now
);
1304 spin_lock_irqsave(&dev
->event_lock
, flags
);
1306 list_for_each_entry_safe(e
, t
, &dev
->vblank_event_list
, base
.link
) {
1307 if (e
->pipe
!= crtc
)
1309 if ((seq
- e
->event
.sequence
) > (1<<23))
1312 DRM_DEBUG("vblank event on %d, current %d\n",
1313 e
->event
.sequence
, seq
);
1315 list_del(&e
->base
.link
);
1316 drm_vblank_put(dev
, e
->pipe
);
1317 send_vblank_event(dev
, e
, seq
, &now
);
1320 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
1322 trace_drm_vblank_event(crtc
, seq
);
1326 * drm_handle_vblank - handle a vblank event
1328 * @crtc: where this event occurred
1330 * Drivers should call this routine in their vblank interrupt handlers to
1331 * update the vblank counter and send any signals that may be pending.
1333 bool drm_handle_vblank(struct drm_device
*dev
, int crtc
)
1337 struct timeval tvblank
;
1338 unsigned long irqflags
;
1340 if (!dev
->num_crtcs
)
1343 /* Need timestamp lock to prevent concurrent execution with
1344 * vblank enable/disable, as this would cause inconsistent
1345 * or corrupted timestamps and vblank counts.
1347 spin_lock_irqsave(&dev
->vblank_time_lock
, irqflags
);
1349 /* Vblank irq handling disabled. Nothing to do. */
1350 if (!dev
->vblank_enabled
[crtc
]) {
1351 spin_unlock_irqrestore(&dev
->vblank_time_lock
, irqflags
);
1355 /* Fetch corresponding timestamp for this vblank interval from
1356 * driver and store it in proper slot of timestamp ringbuffer.
1359 /* Get current timestamp and count. */
1360 vblcount
= atomic_read(&dev
->_vblank_count
[crtc
]);
1361 drm_get_last_vbltimestamp(dev
, crtc
, &tvblank
, DRM_CALLED_FROM_VBLIRQ
);
1363 /* Compute time difference to timestamp of last vblank */
1364 diff_ns
= timeval_to_ns(&tvblank
) -
1365 timeval_to_ns(&vblanktimestamp(dev
, crtc
, vblcount
));
1367 /* Update vblank timestamp and count if at least
1368 * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds
1369 * difference between last stored timestamp and current
1370 * timestamp. A smaller difference means basically
1371 * identical timestamps. Happens if this vblank has
1372 * been already processed and this is a redundant call,
1373 * e.g., due to spurious vblank interrupts. We need to
1374 * ignore those for accounting.
1376 if (abs64(diff_ns
) > DRM_REDUNDANT_VBLIRQ_THRESH_NS
) {
1377 /* Store new timestamp in ringbuffer. */
1378 vblanktimestamp(dev
, crtc
, vblcount
+ 1) = tvblank
;
1380 /* Increment cooked vblank count. This also atomically commits
1381 * the timestamp computed above.
1383 smp_mb__before_atomic_inc();
1384 atomic_inc(&dev
->_vblank_count
[crtc
]);
1385 smp_mb__after_atomic_inc();
1387 DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n",
1388 crtc
, (int) diff_ns
);
1391 DRM_WAKEUP(&dev
->vbl_queue
[crtc
]);
1392 drm_handle_vblank_events(dev
, crtc
);
1394 spin_unlock_irqrestore(&dev
->vblank_time_lock
, irqflags
);
1397 EXPORT_SYMBOL(drm_handle_vblank
);