mirror of https://gitee.com/openkylin/linux.git
1832 lines
54 KiB
C
1832 lines
54 KiB
C
/*
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* drm_irq.c IRQ and vblank support
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
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*
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* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <drm/drmP.h>
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#include "drm_trace.h"
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#include "drm_internal.h"
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#include <linux/interrupt.h> /* For task queue support */
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#include <linux/slab.h>
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#include <linux/vgaarb.h>
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#include <linux/export.h>
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/* Retry timestamp calculation up to 3 times to satisfy
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* drm_timestamp_precision before giving up.
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*/
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#define DRM_TIMESTAMP_MAXRETRIES 3
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/* Threshold in nanoseconds for detection of redundant
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* vblank irq in drm_handle_vblank(). 1 msec should be ok.
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*/
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#define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
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static bool
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drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
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struct timeval *tvblank, unsigned flags);
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static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
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/*
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* Default to use monotonic timestamps for wait-for-vblank and page-flip
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* complete events.
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*/
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unsigned int drm_timestamp_monotonic = 1;
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static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */
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module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
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module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
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module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
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MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)");
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MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
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MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");
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static void store_vblank(struct drm_device *dev, unsigned int pipe,
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u32 vblank_count_inc,
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struct timeval *t_vblank, u32 last)
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{
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struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
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assert_spin_locked(&dev->vblank_time_lock);
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vblank->last = last;
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write_seqlock(&vblank->seqlock);
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vblank->time = *t_vblank;
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vblank->count += vblank_count_inc;
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write_sequnlock(&vblank->seqlock);
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}
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/*
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* Reset the stored timestamp for the current vblank count to correspond
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* to the last vblank occurred.
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*
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* Only to be called from drm_vblank_on().
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*
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* Note: caller must hold dev->vbl_lock since this reads & writes
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* device vblank fields.
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*/
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static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe)
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{
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u32 cur_vblank;
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bool rc;
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struct timeval t_vblank;
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int count = DRM_TIMESTAMP_MAXRETRIES;
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spin_lock(&dev->vblank_time_lock);
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/*
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* sample the current counter to avoid random jumps
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* when drm_vblank_enable() applies the diff
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*/
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do {
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cur_vblank = dev->driver->get_vblank_counter(dev, pipe);
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rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0);
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} while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0);
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/*
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* Only reinitialize corresponding vblank timestamp if high-precision query
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* available and didn't fail. Otherwise reinitialize delayed at next vblank
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* interrupt and assign 0 for now, to mark the vblanktimestamp as invalid.
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*/
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if (!rc)
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t_vblank = (struct timeval) {0, 0};
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/*
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* +1 to make sure user will never see the same
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* vblank counter value before and after a modeset
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*/
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store_vblank(dev, pipe, 1, &t_vblank, cur_vblank);
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spin_unlock(&dev->vblank_time_lock);
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}
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/*
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* Call back into the driver to update the appropriate vblank counter
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* (specified by @pipe). Deal with wraparound, if it occurred, and
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* update the last read value so we can deal with wraparound on the next
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* call if necessary.
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*
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* Only necessary when going from off->on, to account for frames we
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* didn't get an interrupt for.
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*
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* Note: caller must hold dev->vbl_lock since this reads & writes
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* device vblank fields.
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*/
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static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
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unsigned long flags)
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{
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struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
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u32 cur_vblank, diff;
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bool rc;
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struct timeval t_vblank;
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int count = DRM_TIMESTAMP_MAXRETRIES;
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int framedur_ns = vblank->framedur_ns;
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/*
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* Interrupts were disabled prior to this call, so deal with counter
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* wrap if needed.
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* NOTE! It's possible we lost a full dev->max_vblank_count + 1 events
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* here if the register is small or we had vblank interrupts off for
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* a long time.
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*
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* We repeat the hardware vblank counter & timestamp query until
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* we get consistent results. This to prevent races between gpu
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* updating its hardware counter while we are retrieving the
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* corresponding vblank timestamp.
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*/
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do {
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cur_vblank = dev->driver->get_vblank_counter(dev, pipe);
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rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags);
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} while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0);
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if (dev->max_vblank_count != 0) {
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/* trust the hw counter when it's around */
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diff = (cur_vblank - vblank->last) & dev->max_vblank_count;
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} else if (rc && framedur_ns) {
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const struct timeval *t_old;
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u64 diff_ns;
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t_old = &vblank->time;
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diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old);
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/*
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* Figure out how many vblanks we've missed based
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* on the difference in the timestamps and the
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* frame/field duration.
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*/
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diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);
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if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ)
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DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored."
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" diff_ns = %lld, framedur_ns = %d)\n",
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pipe, (long long) diff_ns, framedur_ns);
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} else {
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/* some kind of default for drivers w/o accurate vbl timestamping */
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diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0;
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}
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/*
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* Within a drm_vblank_pre_modeset - drm_vblank_post_modeset
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* interval? If so then vblank irqs keep running and it will likely
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* happen that the hardware vblank counter is not trustworthy as it
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* might reset at some point in that interval and vblank timestamps
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* are not trustworthy either in that interval. Iow. this can result
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* in a bogus diff >> 1 which must be avoided as it would cause
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* random large forward jumps of the software vblank counter.
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*/
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if (diff > 1 && (vblank->inmodeset & 0x2)) {
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DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u"
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" due to pre-modeset.\n", pipe, diff);
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diff = 1;
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}
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DRM_DEBUG_VBL("updating vblank count on crtc %u:"
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" current=%u, diff=%u, hw=%u hw_last=%u\n",
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pipe, vblank->count, diff, cur_vblank, vblank->last);
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if (diff == 0) {
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WARN_ON_ONCE(cur_vblank != vblank->last);
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return;
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}
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/*
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* Only reinitialize corresponding vblank timestamp if high-precision query
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* available and didn't fail, or we were called from the vblank interrupt.
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* Otherwise reinitialize delayed at next vblank interrupt and assign 0
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* for now, to mark the vblanktimestamp as invalid.
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*/
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if (!rc && (flags & DRM_CALLED_FROM_VBLIRQ) == 0)
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t_vblank = (struct timeval) {0, 0};
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store_vblank(dev, pipe, diff, &t_vblank, cur_vblank);
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}
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/**
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* drm_accurate_vblank_count - retrieve the master vblank counter
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* @crtc: which counter to retrieve
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*
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* This function is similar to @drm_crtc_vblank_count but this
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* function interpolates to handle a race with vblank irq's.
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*
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* This is mostly useful for hardware that can obtain the scanout
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* position, but doesn't have a frame counter.
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*/
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u32 drm_accurate_vblank_count(struct drm_crtc *crtc)
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{
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struct drm_device *dev = crtc->dev;
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unsigned int pipe = drm_crtc_index(crtc);
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u32 vblank;
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unsigned long flags;
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WARN(!dev->driver->get_vblank_timestamp,
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"This function requires support for accurate vblank timestamps.");
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spin_lock_irqsave(&dev->vblank_time_lock, flags);
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drm_update_vblank_count(dev, pipe, 0);
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vblank = drm_vblank_count(dev, pipe);
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spin_unlock_irqrestore(&dev->vblank_time_lock, flags);
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return vblank;
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}
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EXPORT_SYMBOL(drm_accurate_vblank_count);
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/*
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* Disable vblank irq's on crtc, make sure that last vblank count
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* of hardware and corresponding consistent software vblank counter
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* are preserved, even if there are any spurious vblank irq's after
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* disable.
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*/
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static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe)
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{
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struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
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unsigned long irqflags;
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/* Prevent vblank irq processing while disabling vblank irqs,
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* so no updates of timestamps or count can happen after we've
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* disabled. Needed to prevent races in case of delayed irq's.
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*/
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spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
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/*
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* Only disable vblank interrupts if they're enabled. This avoids
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* calling the ->disable_vblank() operation in atomic context with the
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* hardware potentially runtime suspended.
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*/
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if (vblank->enabled) {
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dev->driver->disable_vblank(dev, pipe);
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vblank->enabled = false;
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}
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/*
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* Always update the count and timestamp to maintain the
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* appearance that the counter has been ticking all along until
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* this time. This makes the count account for the entire time
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* between drm_vblank_on() and drm_vblank_off().
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*/
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drm_update_vblank_count(dev, pipe, 0);
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spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
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}
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static void vblank_disable_fn(unsigned long arg)
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{
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struct drm_vblank_crtc *vblank = (void *)arg;
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struct drm_device *dev = vblank->dev;
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unsigned int pipe = vblank->pipe;
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unsigned long irqflags;
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spin_lock_irqsave(&dev->vbl_lock, irqflags);
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if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) {
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DRM_DEBUG("disabling vblank on crtc %u\n", pipe);
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vblank_disable_and_save(dev, pipe);
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}
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spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
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}
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/**
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* drm_vblank_cleanup - cleanup vblank support
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* @dev: DRM device
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*
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* This function cleans up any resources allocated in drm_vblank_init.
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*/
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void drm_vblank_cleanup(struct drm_device *dev)
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{
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unsigned int pipe;
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/* Bail if the driver didn't call drm_vblank_init() */
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if (dev->num_crtcs == 0)
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return;
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for (pipe = 0; pipe < dev->num_crtcs; pipe++) {
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struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
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WARN_ON(vblank->enabled &&
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drm_core_check_feature(dev, DRIVER_MODESET));
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del_timer_sync(&vblank->disable_timer);
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}
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kfree(dev->vblank);
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dev->num_crtcs = 0;
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}
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EXPORT_SYMBOL(drm_vblank_cleanup);
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/**
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* drm_vblank_init - initialize vblank support
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* @dev: DRM device
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* @num_crtcs: number of CRTCs supported by @dev
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*
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* This function initializes vblank support for @num_crtcs display pipelines.
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*
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* Returns:
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* Zero on success or a negative error code on failure.
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*/
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int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
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{
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int ret = -ENOMEM;
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unsigned int i;
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spin_lock_init(&dev->vbl_lock);
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spin_lock_init(&dev->vblank_time_lock);
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dev->num_crtcs = num_crtcs;
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dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL);
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if (!dev->vblank)
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goto err;
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for (i = 0; i < num_crtcs; i++) {
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struct drm_vblank_crtc *vblank = &dev->vblank[i];
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vblank->dev = dev;
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vblank->pipe = i;
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init_waitqueue_head(&vblank->queue);
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setup_timer(&vblank->disable_timer, vblank_disable_fn,
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(unsigned long)vblank);
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seqlock_init(&vblank->seqlock);
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}
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DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n");
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/* Driver specific high-precision vblank timestamping supported? */
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if (dev->driver->get_vblank_timestamp)
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DRM_INFO("Driver supports precise vblank timestamp query.\n");
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else
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DRM_INFO("No driver support for vblank timestamp query.\n");
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/* Must have precise timestamping for reliable vblank instant disable */
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if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) {
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dev->vblank_disable_immediate = false;
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DRM_INFO("Setting vblank_disable_immediate to false because "
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"get_vblank_timestamp == NULL\n");
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}
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return 0;
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err:
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dev->num_crtcs = 0;
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return ret;
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}
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EXPORT_SYMBOL(drm_vblank_init);
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static void drm_irq_vgaarb_nokms(void *cookie, bool state)
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{
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struct drm_device *dev = cookie;
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if (dev->driver->vgaarb_irq) {
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dev->driver->vgaarb_irq(dev, state);
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return;
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}
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if (!dev->irq_enabled)
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return;
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if (state) {
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if (dev->driver->irq_uninstall)
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dev->driver->irq_uninstall(dev);
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} else {
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if (dev->driver->irq_preinstall)
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dev->driver->irq_preinstall(dev);
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if (dev->driver->irq_postinstall)
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dev->driver->irq_postinstall(dev);
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}
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}
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/**
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* drm_irq_install - install IRQ handler
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* @dev: DRM device
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* @irq: IRQ number to install the handler for
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*
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* Initializes the IRQ related data. Installs the handler, calling the driver
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* irq_preinstall() and irq_postinstall() functions before and after the
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* installation.
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*
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* This is the simplified helper interface provided for drivers with no special
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* needs. Drivers which need to install interrupt handlers for multiple
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* interrupts must instead set drm_device->irq_enabled to signal the DRM core
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* that vblank interrupts are available.
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*
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* Returns:
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* Zero on success or a negative error code on failure.
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*/
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int drm_irq_install(struct drm_device *dev, int irq)
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{
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int ret;
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unsigned long sh_flags = 0;
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|
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return -EINVAL;
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if (irq == 0)
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return -EINVAL;
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|
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/* Driver must have been initialized */
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if (!dev->dev_private)
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return -EINVAL;
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if (dev->irq_enabled)
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return -EBUSY;
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dev->irq_enabled = true;
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DRM_DEBUG("irq=%d\n", irq);
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/* Before installing handler */
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if (dev->driver->irq_preinstall)
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dev->driver->irq_preinstall(dev);
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|
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/* Install handler */
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if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
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sh_flags = IRQF_SHARED;
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ret = request_irq(irq, dev->driver->irq_handler,
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sh_flags, dev->driver->name, dev);
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|
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if (ret < 0) {
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dev->irq_enabled = false;
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return ret;
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}
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|
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL);
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|
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/* After installing handler */
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if (dev->driver->irq_postinstall)
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ret = dev->driver->irq_postinstall(dev);
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|
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if (ret < 0) {
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dev->irq_enabled = false;
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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vga_client_register(dev->pdev, NULL, NULL, NULL);
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|
free_irq(irq, dev);
|
|
} else {
|
|
dev->irq = irq;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_irq_install);
|
|
|
|
/**
|
|
* drm_irq_uninstall - uninstall the IRQ handler
|
|
* @dev: DRM device
|
|
*
|
|
* Calls the driver's irq_uninstall() function and unregisters the IRQ handler.
|
|
* This should only be called by drivers which used drm_irq_install() to set up
|
|
* their interrupt handler. Other drivers must only reset
|
|
* drm_device->irq_enabled to false.
|
|
*
|
|
* Note that for kernel modesetting drivers it is a bug if this function fails.
|
|
* The sanity checks are only to catch buggy user modesetting drivers which call
|
|
* the same function through an ioctl.
|
|
*
|
|
* Returns:
|
|
* Zero on success or a negative error code on failure.
|
|
*/
|
|
int drm_irq_uninstall(struct drm_device *dev)
|
|
{
|
|
unsigned long irqflags;
|
|
bool irq_enabled;
|
|
int i;
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
|
|
return -EINVAL;
|
|
|
|
irq_enabled = dev->irq_enabled;
|
|
dev->irq_enabled = false;
|
|
|
|
/*
|
|
* Wake up any waiters so they don't hang. This is just to paper over
|
|
* issues for UMS drivers which aren't in full control of their
|
|
* vblank/irq handling. KMS drivers must ensure that vblanks are all
|
|
* disabled when uninstalling the irq handler.
|
|
*/
|
|
if (dev->num_crtcs) {
|
|
spin_lock_irqsave(&dev->vbl_lock, irqflags);
|
|
for (i = 0; i < dev->num_crtcs; i++) {
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[i];
|
|
|
|
if (!vblank->enabled)
|
|
continue;
|
|
|
|
WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET));
|
|
|
|
vblank_disable_and_save(dev, i);
|
|
wake_up(&vblank->queue);
|
|
}
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
|
}
|
|
|
|
if (!irq_enabled)
|
|
return -EINVAL;
|
|
|
|
DRM_DEBUG("irq=%d\n", dev->irq);
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_MODESET))
|
|
vga_client_register(dev->pdev, NULL, NULL, NULL);
|
|
|
|
if (dev->driver->irq_uninstall)
|
|
dev->driver->irq_uninstall(dev);
|
|
|
|
free_irq(dev->irq, dev);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_irq_uninstall);
|
|
|
|
/*
|
|
* IRQ control ioctl.
|
|
*
|
|
* \param inode device inode.
|
|
* \param file_priv DRM file private.
|
|
* \param cmd command.
|
|
* \param arg user argument, pointing to a drm_control structure.
|
|
* \return zero on success or a negative number on failure.
|
|
*
|
|
* Calls irq_install() or irq_uninstall() according to \p arg.
|
|
*/
|
|
int drm_control(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_control *ctl = data;
|
|
int ret = 0, irq;
|
|
|
|
/* if we haven't irq we fallback for compatibility reasons -
|
|
* this used to be a separate function in drm_dma.h
|
|
*/
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
|
|
return 0;
|
|
if (drm_core_check_feature(dev, DRIVER_MODESET))
|
|
return 0;
|
|
/* UMS was only ever supported on pci devices. */
|
|
if (WARN_ON(!dev->pdev))
|
|
return -EINVAL;
|
|
|
|
switch (ctl->func) {
|
|
case DRM_INST_HANDLER:
|
|
irq = dev->pdev->irq;
|
|
|
|
if (dev->if_version < DRM_IF_VERSION(1, 2) &&
|
|
ctl->irq != irq)
|
|
return -EINVAL;
|
|
mutex_lock(&dev->struct_mutex);
|
|
ret = drm_irq_install(dev, irq);
|
|
mutex_unlock(&dev->struct_mutex);
|
|
|
|
return ret;
|
|
case DRM_UNINST_HANDLER:
|
|
mutex_lock(&dev->struct_mutex);
|
|
ret = drm_irq_uninstall(dev);
|
|
mutex_unlock(&dev->struct_mutex);
|
|
|
|
return ret;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* drm_calc_timestamping_constants - calculate vblank timestamp constants
|
|
* @crtc: drm_crtc whose timestamp constants should be updated.
|
|
* @mode: display mode containing the scanout timings
|
|
*
|
|
* Calculate and store various constants which are later
|
|
* needed by vblank and swap-completion timestamping, e.g,
|
|
* by drm_calc_vbltimestamp_from_scanoutpos(). They are
|
|
* derived from CRTC's true scanout timing, so they take
|
|
* things like panel scaling or other adjustments into account.
|
|
*/
|
|
void drm_calc_timestamping_constants(struct drm_crtc *crtc,
|
|
const struct drm_display_mode *mode)
|
|
{
|
|
struct drm_device *dev = crtc->dev;
|
|
unsigned int pipe = drm_crtc_index(crtc);
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
int linedur_ns = 0, framedur_ns = 0;
|
|
int dotclock = mode->crtc_clock;
|
|
|
|
if (!dev->num_crtcs)
|
|
return;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
/* Valid dotclock? */
|
|
if (dotclock > 0) {
|
|
int frame_size = mode->crtc_htotal * mode->crtc_vtotal;
|
|
|
|
/*
|
|
* Convert scanline length in pixels and video
|
|
* dot clock to line duration and frame duration
|
|
* in nanoseconds:
|
|
*/
|
|
linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock);
|
|
framedur_ns = div_u64((u64) frame_size * 1000000, dotclock);
|
|
|
|
/*
|
|
* Fields of interlaced scanout modes are only half a frame duration.
|
|
*/
|
|
if (mode->flags & DRM_MODE_FLAG_INTERLACE)
|
|
framedur_ns /= 2;
|
|
} else
|
|
DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n",
|
|
crtc->base.id);
|
|
|
|
vblank->linedur_ns = linedur_ns;
|
|
vblank->framedur_ns = framedur_ns;
|
|
|
|
DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n",
|
|
crtc->base.id, mode->crtc_htotal,
|
|
mode->crtc_vtotal, mode->crtc_vdisplay);
|
|
DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n",
|
|
crtc->base.id, dotclock, framedur_ns, linedur_ns);
|
|
}
|
|
EXPORT_SYMBOL(drm_calc_timestamping_constants);
|
|
|
|
/**
|
|
* drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper
|
|
* @dev: DRM device
|
|
* @pipe: index of CRTC whose vblank timestamp to retrieve
|
|
* @max_error: Desired maximum allowable error in timestamps (nanosecs)
|
|
* On return contains true maximum error of timestamp
|
|
* @vblank_time: Pointer to struct timeval which should receive the timestamp
|
|
* @flags: Flags to pass to driver:
|
|
* 0 = Default,
|
|
* DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
|
|
* @mode: mode which defines the scanout timings
|
|
*
|
|
* Implements calculation of exact vblank timestamps from given drm_display_mode
|
|
* timings and current video scanout position of a CRTC. This can be called from
|
|
* within get_vblank_timestamp() implementation of a kms driver to implement the
|
|
* actual timestamping.
|
|
*
|
|
* Should return timestamps conforming to the OML_sync_control OpenML
|
|
* extension specification. The timestamp corresponds to the end of
|
|
* the vblank interval, aka start of scanout of topmost-leftmost display
|
|
* pixel in the following video frame.
|
|
*
|
|
* Requires support for optional dev->driver->get_scanout_position()
|
|
* in kms driver, plus a bit of setup code to provide a drm_display_mode
|
|
* that corresponds to the true scanout timing.
|
|
*
|
|
* The current implementation only handles standard video modes. It
|
|
* returns as no operation if a doublescan or interlaced video mode is
|
|
* active. Higher level code is expected to handle this.
|
|
*
|
|
* Returns:
|
|
* Negative value on error, failure or if not supported in current
|
|
* video mode:
|
|
*
|
|
* -EINVAL - Invalid CRTC.
|
|
* -EAGAIN - Temporary unavailable, e.g., called before initial modeset.
|
|
* -ENOTSUPP - Function not supported in current display mode.
|
|
* -EIO - Failed, e.g., due to failed scanout position query.
|
|
*
|
|
* Returns or'ed positive status flags on success:
|
|
*
|
|
* DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.
|
|
* DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.
|
|
*
|
|
*/
|
|
int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
|
|
unsigned int pipe,
|
|
int *max_error,
|
|
struct timeval *vblank_time,
|
|
unsigned flags,
|
|
const struct drm_display_mode *mode)
|
|
{
|
|
struct timeval tv_etime;
|
|
ktime_t stime, etime;
|
|
unsigned int vbl_status;
|
|
int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD;
|
|
int vpos, hpos, i;
|
|
int delta_ns, duration_ns;
|
|
|
|
if (pipe >= dev->num_crtcs) {
|
|
DRM_ERROR("Invalid crtc %u\n", pipe);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Scanout position query not supported? Should not happen. */
|
|
if (!dev->driver->get_scanout_position) {
|
|
DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/* If mode timing undefined, just return as no-op:
|
|
* Happens during initial modesetting of a crtc.
|
|
*/
|
|
if (mode->crtc_clock == 0) {
|
|
DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* Get current scanout position with system timestamp.
|
|
* Repeat query up to DRM_TIMESTAMP_MAXRETRIES times
|
|
* if single query takes longer than max_error nanoseconds.
|
|
*
|
|
* This guarantees a tight bound on maximum error if
|
|
* code gets preempted or delayed for some reason.
|
|
*/
|
|
for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) {
|
|
/*
|
|
* Get vertical and horizontal scanout position vpos, hpos,
|
|
* and bounding timestamps stime, etime, pre/post query.
|
|
*/
|
|
vbl_status = dev->driver->get_scanout_position(dev, pipe, flags,
|
|
&vpos, &hpos,
|
|
&stime, &etime,
|
|
mode);
|
|
|
|
/* Return as no-op if scanout query unsupported or failed. */
|
|
if (!(vbl_status & DRM_SCANOUTPOS_VALID)) {
|
|
DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n",
|
|
pipe, vbl_status);
|
|
return -EIO;
|
|
}
|
|
|
|
/* Compute uncertainty in timestamp of scanout position query. */
|
|
duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime);
|
|
|
|
/* Accept result with < max_error nsecs timing uncertainty. */
|
|
if (duration_ns <= *max_error)
|
|
break;
|
|
}
|
|
|
|
/* Noisy system timing? */
|
|
if (i == DRM_TIMESTAMP_MAXRETRIES) {
|
|
DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n",
|
|
pipe, duration_ns/1000, *max_error/1000, i);
|
|
}
|
|
|
|
/* Return upper bound of timestamp precision error. */
|
|
*max_error = duration_ns;
|
|
|
|
/* Check if in vblank area:
|
|
* vpos is >=0 in video scanout area, but negative
|
|
* within vblank area, counting down the number of lines until
|
|
* start of scanout.
|
|
*/
|
|
if (vbl_status & DRM_SCANOUTPOS_IN_VBLANK)
|
|
ret |= DRM_VBLANKTIME_IN_VBLANK;
|
|
|
|
/* Convert scanout position into elapsed time at raw_time query
|
|
* since start of scanout at first display scanline. delta_ns
|
|
* can be negative if start of scanout hasn't happened yet.
|
|
*/
|
|
delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos),
|
|
mode->crtc_clock);
|
|
|
|
if (!drm_timestamp_monotonic)
|
|
etime = ktime_mono_to_real(etime);
|
|
|
|
/* save this only for debugging purposes */
|
|
tv_etime = ktime_to_timeval(etime);
|
|
/* Subtract time delta from raw timestamp to get final
|
|
* vblank_time timestamp for end of vblank.
|
|
*/
|
|
etime = ktime_sub_ns(etime, delta_ns);
|
|
*vblank_time = ktime_to_timeval(etime);
|
|
|
|
DRM_DEBUG_VBL("crtc %u : v 0x%x p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",
|
|
pipe, vbl_status, hpos, vpos,
|
|
(long)tv_etime.tv_sec, (long)tv_etime.tv_usec,
|
|
(long)vblank_time->tv_sec, (long)vblank_time->tv_usec,
|
|
duration_ns/1000, i);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
|
|
|
|
static struct timeval get_drm_timestamp(void)
|
|
{
|
|
ktime_t now;
|
|
|
|
now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real();
|
|
return ktime_to_timeval(now);
|
|
}
|
|
|
|
/**
|
|
* drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent
|
|
* vblank interval
|
|
* @dev: DRM device
|
|
* @pipe: index of CRTC whose vblank timestamp to retrieve
|
|
* @tvblank: Pointer to target struct timeval which should receive the timestamp
|
|
* @flags: Flags to pass to driver:
|
|
* 0 = Default,
|
|
* DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
|
|
*
|
|
* Fetches the system timestamp corresponding to the time of the most recent
|
|
* vblank interval on specified CRTC. May call into kms-driver to
|
|
* compute the timestamp with a high-precision GPU specific method.
|
|
*
|
|
* Returns zero if timestamp originates from uncorrected do_gettimeofday()
|
|
* call, i.e., it isn't very precisely locked to the true vblank.
|
|
*
|
|
* Returns:
|
|
* True if timestamp is considered to be very precise, false otherwise.
|
|
*/
|
|
static bool
|
|
drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
|
|
struct timeval *tvblank, unsigned flags)
|
|
{
|
|
int ret;
|
|
|
|
/* Define requested maximum error on timestamps (nanoseconds). */
|
|
int max_error = (int) drm_timestamp_precision * 1000;
|
|
|
|
/* Query driver if possible and precision timestamping enabled. */
|
|
if (dev->driver->get_vblank_timestamp && (max_error > 0)) {
|
|
ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error,
|
|
tvblank, flags);
|
|
if (ret > 0)
|
|
return true;
|
|
}
|
|
|
|
/* GPU high precision timestamp query unsupported or failed.
|
|
* Return current monotonic/gettimeofday timestamp as best estimate.
|
|
*/
|
|
*tvblank = get_drm_timestamp();
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* drm_vblank_count - retrieve "cooked" vblank counter value
|
|
* @dev: DRM device
|
|
* @pipe: index of CRTC for which to retrieve the counter
|
|
*
|
|
* Fetches the "cooked" vblank count value that represents the number of
|
|
* vblank events since the system was booted, including lost events due to
|
|
* modesetting activity.
|
|
*
|
|
* This is the legacy version of drm_crtc_vblank_count().
|
|
*
|
|
* Returns:
|
|
* The software vblank counter.
|
|
*/
|
|
u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return 0;
|
|
|
|
return vblank->count;
|
|
}
|
|
EXPORT_SYMBOL(drm_vblank_count);
|
|
|
|
/**
|
|
* drm_crtc_vblank_count - retrieve "cooked" vblank counter value
|
|
* @crtc: which counter to retrieve
|
|
*
|
|
* Fetches the "cooked" vblank count value that represents the number of
|
|
* vblank events since the system was booted, including lost events due to
|
|
* modesetting activity.
|
|
*
|
|
* This is the native KMS version of drm_vblank_count().
|
|
*
|
|
* Returns:
|
|
* The software vblank counter.
|
|
*/
|
|
u32 drm_crtc_vblank_count(struct drm_crtc *crtc)
|
|
{
|
|
return drm_vblank_count(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_count);
|
|
|
|
/**
|
|
* drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the
|
|
* system timestamp corresponding to that vblank counter value.
|
|
* @dev: DRM device
|
|
* @pipe: index of CRTC whose counter to retrieve
|
|
* @vblanktime: Pointer to struct timeval to receive the vblank timestamp.
|
|
*
|
|
* Fetches the "cooked" vblank count value that represents the number of
|
|
* vblank events since the system was booted, including lost events due to
|
|
* modesetting activity. Returns corresponding system timestamp of the time
|
|
* of the vblank interval that corresponds to the current vblank counter value.
|
|
*
|
|
* This is the legacy version of drm_crtc_vblank_count_and_time().
|
|
*/
|
|
static u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe,
|
|
struct timeval *vblanktime)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
u32 vblank_count;
|
|
unsigned int seq;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return 0;
|
|
|
|
do {
|
|
seq = read_seqbegin(&vblank->seqlock);
|
|
vblank_count = vblank->count;
|
|
*vblanktime = vblank->time;
|
|
} while (read_seqretry(&vblank->seqlock, seq));
|
|
|
|
return vblank_count;
|
|
}
|
|
|
|
/**
|
|
* drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value
|
|
* and the system timestamp corresponding to that vblank counter value
|
|
* @crtc: which counter to retrieve
|
|
* @vblanktime: Pointer to struct timeval to receive the vblank timestamp.
|
|
*
|
|
* Fetches the "cooked" vblank count value that represents the number of
|
|
* vblank events since the system was booted, including lost events due to
|
|
* modesetting activity. Returns corresponding system timestamp of the time
|
|
* of the vblank interval that corresponds to the current vblank counter value.
|
|
*/
|
|
u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
|
|
struct timeval *vblanktime)
|
|
{
|
|
return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc),
|
|
vblanktime);
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_count_and_time);
|
|
|
|
static void send_vblank_event(struct drm_device *dev,
|
|
struct drm_pending_vblank_event *e,
|
|
unsigned long seq, struct timeval *now)
|
|
{
|
|
e->event.sequence = seq;
|
|
e->event.tv_sec = now->tv_sec;
|
|
e->event.tv_usec = now->tv_usec;
|
|
|
|
trace_drm_vblank_event_delivered(e->base.pid, e->pipe,
|
|
e->event.sequence);
|
|
|
|
drm_send_event_locked(dev, &e->base);
|
|
}
|
|
|
|
/**
|
|
* drm_crtc_arm_vblank_event - arm vblank event after pageflip
|
|
* @crtc: the source CRTC of the vblank event
|
|
* @e: the event to send
|
|
*
|
|
* A lot of drivers need to generate vblank events for the very next vblank
|
|
* interrupt. For example when the page flip interrupt happens when the page
|
|
* flip gets armed, but not when it actually executes within the next vblank
|
|
* period. This helper function implements exactly the required vblank arming
|
|
* behaviour.
|
|
*
|
|
* Caller must hold event lock. Caller must also hold a vblank reference for
|
|
* the event @e, which will be dropped when the next vblank arrives.
|
|
*/
|
|
void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
|
|
struct drm_pending_vblank_event *e)
|
|
{
|
|
struct drm_device *dev = crtc->dev;
|
|
unsigned int pipe = drm_crtc_index(crtc);
|
|
|
|
assert_spin_locked(&dev->event_lock);
|
|
|
|
e->pipe = pipe;
|
|
e->event.sequence = drm_vblank_count(dev, pipe);
|
|
list_add_tail(&e->base.link, &dev->vblank_event_list);
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_arm_vblank_event);
|
|
|
|
/**
|
|
* drm_crtc_send_vblank_event - helper to send vblank event after pageflip
|
|
* @crtc: the source CRTC of the vblank event
|
|
* @e: the event to send
|
|
*
|
|
* Updates sequence # and timestamp on event, and sends it to userspace.
|
|
* Caller must hold event lock.
|
|
*/
|
|
void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
|
|
struct drm_pending_vblank_event *e)
|
|
{
|
|
struct drm_device *dev = crtc->dev;
|
|
unsigned int seq, pipe = drm_crtc_index(crtc);
|
|
struct timeval now;
|
|
|
|
if (dev->num_crtcs > 0) {
|
|
seq = drm_vblank_count_and_time(dev, pipe, &now);
|
|
} else {
|
|
seq = 0;
|
|
|
|
now = get_drm_timestamp();
|
|
}
|
|
e->pipe = pipe;
|
|
send_vblank_event(dev, e, seq, &now);
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_send_vblank_event);
|
|
|
|
/**
|
|
* drm_vblank_enable - enable the vblank interrupt on a CRTC
|
|
* @dev: DRM device
|
|
* @pipe: CRTC index
|
|
*
|
|
* Returns:
|
|
* Zero on success or a negative error code on failure.
|
|
*/
|
|
static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
int ret = 0;
|
|
|
|
assert_spin_locked(&dev->vbl_lock);
|
|
|
|
spin_lock(&dev->vblank_time_lock);
|
|
|
|
if (!vblank->enabled) {
|
|
/*
|
|
* Enable vblank irqs under vblank_time_lock protection.
|
|
* All vblank count & timestamp updates are held off
|
|
* until we are done reinitializing master counter and
|
|
* timestamps. Filtercode in drm_handle_vblank() will
|
|
* prevent double-accounting of same vblank interval.
|
|
*/
|
|
ret = dev->driver->enable_vblank(dev, pipe);
|
|
DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret);
|
|
if (ret)
|
|
atomic_dec(&vblank->refcount);
|
|
else {
|
|
vblank->enabled = true;
|
|
drm_update_vblank_count(dev, pipe, 0);
|
|
}
|
|
}
|
|
|
|
spin_unlock(&dev->vblank_time_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_vblank_get - get a reference count on vblank events
|
|
* @dev: DRM device
|
|
* @pipe: index of CRTC to own
|
|
*
|
|
* Acquire a reference count on vblank events to avoid having them disabled
|
|
* while in use.
|
|
*
|
|
* This is the legacy version of drm_crtc_vblank_get().
|
|
*
|
|
* Returns:
|
|
* Zero on success or a negative error code on failure.
|
|
*/
|
|
static int drm_vblank_get(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
unsigned long irqflags;
|
|
int ret = 0;
|
|
|
|
if (!dev->num_crtcs)
|
|
return -EINVAL;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&dev->vbl_lock, irqflags);
|
|
/* Going from 0->1 means we have to enable interrupts again */
|
|
if (atomic_add_return(1, &vblank->refcount) == 1) {
|
|
ret = drm_vblank_enable(dev, pipe);
|
|
} else {
|
|
if (!vblank->enabled) {
|
|
atomic_dec(&vblank->refcount);
|
|
ret = -EINVAL;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_crtc_vblank_get - get a reference count on vblank events
|
|
* @crtc: which CRTC to own
|
|
*
|
|
* Acquire a reference count on vblank events to avoid having them disabled
|
|
* while in use.
|
|
*
|
|
* Returns:
|
|
* Zero on success or a negative error code on failure.
|
|
*/
|
|
int drm_crtc_vblank_get(struct drm_crtc *crtc)
|
|
{
|
|
return drm_vblank_get(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_get);
|
|
|
|
/**
|
|
* drm_vblank_put - release ownership of vblank events
|
|
* @dev: DRM device
|
|
* @pipe: index of CRTC to release
|
|
*
|
|
* Release ownership of a given vblank counter, turning off interrupts
|
|
* if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
|
|
*
|
|
* This is the legacy version of drm_crtc_vblank_put().
|
|
*/
|
|
static void drm_vblank_put(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
if (WARN_ON(atomic_read(&vblank->refcount) == 0))
|
|
return;
|
|
|
|
/* Last user schedules interrupt disable */
|
|
if (atomic_dec_and_test(&vblank->refcount)) {
|
|
if (drm_vblank_offdelay == 0)
|
|
return;
|
|
else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0)
|
|
vblank_disable_fn((unsigned long)vblank);
|
|
else
|
|
mod_timer(&vblank->disable_timer,
|
|
jiffies + ((drm_vblank_offdelay * HZ)/1000));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* drm_crtc_vblank_put - give up ownership of vblank events
|
|
* @crtc: which counter to give up
|
|
*
|
|
* Release ownership of a given vblank counter, turning off interrupts
|
|
* if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
|
|
*/
|
|
void drm_crtc_vblank_put(struct drm_crtc *crtc)
|
|
{
|
|
drm_vblank_put(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_put);
|
|
|
|
/**
|
|
* drm_wait_one_vblank - wait for one vblank
|
|
* @dev: DRM device
|
|
* @pipe: CRTC index
|
|
*
|
|
* This waits for one vblank to pass on @pipe, using the irq driver interfaces.
|
|
* It is a failure to call this when the vblank irq for @pipe is disabled, e.g.
|
|
* due to lack of driver support or because the crtc is off.
|
|
*/
|
|
void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
int ret;
|
|
u32 last;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
ret = drm_vblank_get(dev, pipe);
|
|
if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret))
|
|
return;
|
|
|
|
last = drm_vblank_count(dev, pipe);
|
|
|
|
ret = wait_event_timeout(vblank->queue,
|
|
last != drm_vblank_count(dev, pipe),
|
|
msecs_to_jiffies(100));
|
|
|
|
WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe);
|
|
|
|
drm_vblank_put(dev, pipe);
|
|
}
|
|
EXPORT_SYMBOL(drm_wait_one_vblank);
|
|
|
|
/**
|
|
* drm_crtc_wait_one_vblank - wait for one vblank
|
|
* @crtc: DRM crtc
|
|
*
|
|
* This waits for one vblank to pass on @crtc, using the irq driver interfaces.
|
|
* It is a failure to call this when the vblank irq for @crtc is disabled, e.g.
|
|
* due to lack of driver support or because the crtc is off.
|
|
*/
|
|
void drm_crtc_wait_one_vblank(struct drm_crtc *crtc)
|
|
{
|
|
drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_wait_one_vblank);
|
|
|
|
/**
|
|
* drm_vblank_off - disable vblank events on a CRTC
|
|
* @dev: DRM device
|
|
* @pipe: CRTC index
|
|
*
|
|
* Drivers can use this function to shut down the vblank interrupt handling when
|
|
* disabling a crtc. This function ensures that the latest vblank frame count is
|
|
* stored so that drm_vblank_on() can restore it again.
|
|
*
|
|
* Drivers must use this function when the hardware vblank counter can get
|
|
* reset, e.g. when suspending.
|
|
*
|
|
* This is the legacy version of drm_crtc_vblank_off().
|
|
*/
|
|
void drm_vblank_off(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
struct drm_pending_vblank_event *e, *t;
|
|
struct timeval now;
|
|
unsigned long irqflags;
|
|
unsigned int seq;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
spin_lock_irqsave(&dev->event_lock, irqflags);
|
|
|
|
spin_lock(&dev->vbl_lock);
|
|
DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n",
|
|
pipe, vblank->enabled, vblank->inmodeset);
|
|
|
|
/* Avoid redundant vblank disables without previous drm_vblank_on(). */
|
|
if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset)
|
|
vblank_disable_and_save(dev, pipe);
|
|
|
|
wake_up(&vblank->queue);
|
|
|
|
/*
|
|
* Prevent subsequent drm_vblank_get() from re-enabling
|
|
* the vblank interrupt by bumping the refcount.
|
|
*/
|
|
if (!vblank->inmodeset) {
|
|
atomic_inc(&vblank->refcount);
|
|
vblank->inmodeset = 1;
|
|
}
|
|
spin_unlock(&dev->vbl_lock);
|
|
|
|
/* Send any queued vblank events, lest the natives grow disquiet */
|
|
seq = drm_vblank_count_and_time(dev, pipe, &now);
|
|
|
|
list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
|
|
if (e->pipe != pipe)
|
|
continue;
|
|
DRM_DEBUG("Sending premature vblank event on disable: "
|
|
"wanted %u, current %u\n",
|
|
e->event.sequence, seq);
|
|
list_del(&e->base.link);
|
|
drm_vblank_put(dev, pipe);
|
|
send_vblank_event(dev, e, seq, &now);
|
|
}
|
|
spin_unlock_irqrestore(&dev->event_lock, irqflags);
|
|
}
|
|
EXPORT_SYMBOL(drm_vblank_off);
|
|
|
|
/**
|
|
* drm_crtc_vblank_off - disable vblank events on a CRTC
|
|
* @crtc: CRTC in question
|
|
*
|
|
* Drivers can use this function to shut down the vblank interrupt handling when
|
|
* disabling a crtc. This function ensures that the latest vblank frame count is
|
|
* stored so that drm_vblank_on can restore it again.
|
|
*
|
|
* Drivers must use this function when the hardware vblank counter can get
|
|
* reset, e.g. when suspending.
|
|
*
|
|
* This is the native kms version of drm_vblank_off().
|
|
*/
|
|
void drm_crtc_vblank_off(struct drm_crtc *crtc)
|
|
{
|
|
drm_vblank_off(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_off);
|
|
|
|
/**
|
|
* drm_crtc_vblank_reset - reset vblank state to off on a CRTC
|
|
* @crtc: CRTC in question
|
|
*
|
|
* Drivers can use this function to reset the vblank state to off at load time.
|
|
* Drivers should use this together with the drm_crtc_vblank_off() and
|
|
* drm_crtc_vblank_on() functions. The difference compared to
|
|
* drm_crtc_vblank_off() is that this function doesn't save the vblank counter
|
|
* and hence doesn't need to call any driver hooks.
|
|
*/
|
|
void drm_crtc_vblank_reset(struct drm_crtc *crtc)
|
|
{
|
|
struct drm_device *dev = crtc->dev;
|
|
unsigned long irqflags;
|
|
unsigned int pipe = drm_crtc_index(crtc);
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
|
|
spin_lock_irqsave(&dev->vbl_lock, irqflags);
|
|
/*
|
|
* Prevent subsequent drm_vblank_get() from enabling the vblank
|
|
* interrupt by bumping the refcount.
|
|
*/
|
|
if (!vblank->inmodeset) {
|
|
atomic_inc(&vblank->refcount);
|
|
vblank->inmodeset = 1;
|
|
}
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
|
|
|
WARN_ON(!list_empty(&dev->vblank_event_list));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_reset);
|
|
|
|
/**
|
|
* drm_vblank_on - enable vblank events on a CRTC
|
|
* @dev: DRM device
|
|
* @pipe: CRTC index
|
|
*
|
|
* This functions restores the vblank interrupt state captured with
|
|
* drm_vblank_off() again. Note that calls to drm_vblank_on() and
|
|
* drm_vblank_off() can be unbalanced and so can also be unconditionally called
|
|
* in driver load code to reflect the current hardware state of the crtc.
|
|
*
|
|
* This is the legacy version of drm_crtc_vblank_on().
|
|
*/
|
|
void drm_vblank_on(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
unsigned long irqflags;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
spin_lock_irqsave(&dev->vbl_lock, irqflags);
|
|
DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n",
|
|
pipe, vblank->enabled, vblank->inmodeset);
|
|
|
|
/* Drop our private "prevent drm_vblank_get" refcount */
|
|
if (vblank->inmodeset) {
|
|
atomic_dec(&vblank->refcount);
|
|
vblank->inmodeset = 0;
|
|
}
|
|
|
|
drm_reset_vblank_timestamp(dev, pipe);
|
|
|
|
/*
|
|
* re-enable interrupts if there are users left, or the
|
|
* user wishes vblank interrupts to be enabled all the time.
|
|
*/
|
|
if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0)
|
|
WARN_ON(drm_vblank_enable(dev, pipe));
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
|
}
|
|
EXPORT_SYMBOL(drm_vblank_on);
|
|
|
|
/**
|
|
* drm_crtc_vblank_on - enable vblank events on a CRTC
|
|
* @crtc: CRTC in question
|
|
*
|
|
* This functions restores the vblank interrupt state captured with
|
|
* drm_vblank_off() again. Note that calls to drm_vblank_on() and
|
|
* drm_vblank_off() can be unbalanced and so can also be unconditionally called
|
|
* in driver load code to reflect the current hardware state of the crtc.
|
|
*
|
|
* This is the native kms version of drm_vblank_on().
|
|
*/
|
|
void drm_crtc_vblank_on(struct drm_crtc *crtc)
|
|
{
|
|
drm_vblank_on(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_on);
|
|
|
|
/**
|
|
* drm_vblank_pre_modeset - account for vblanks across mode sets
|
|
* @dev: DRM device
|
|
* @pipe: CRTC index
|
|
*
|
|
* Account for vblank events across mode setting events, which will likely
|
|
* reset the hardware frame counter.
|
|
*
|
|
* This is done by grabbing a temporary vblank reference to ensure that the
|
|
* vblank interrupt keeps running across the modeset sequence. With this the
|
|
* software-side vblank frame counting will ensure that there are no jumps or
|
|
* discontinuities.
|
|
*
|
|
* Unfortunately this approach is racy and also doesn't work when the vblank
|
|
* interrupt stops running, e.g. across system suspend resume. It is therefore
|
|
* highly recommended that drivers use the newer drm_vblank_off() and
|
|
* drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when
|
|
* using "cooked" software vblank frame counters and not relying on any hardware
|
|
* counters.
|
|
*
|
|
* Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc
|
|
* again.
|
|
*/
|
|
void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
|
|
/* vblank is not initialized (IRQ not installed ?), or has been freed */
|
|
if (!dev->num_crtcs)
|
|
return;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
/*
|
|
* To avoid all the problems that might happen if interrupts
|
|
* were enabled/disabled around or between these calls, we just
|
|
* have the kernel take a reference on the CRTC (just once though
|
|
* to avoid corrupting the count if multiple, mismatch calls occur),
|
|
* so that interrupts remain enabled in the interim.
|
|
*/
|
|
if (!vblank->inmodeset) {
|
|
vblank->inmodeset = 0x1;
|
|
if (drm_vblank_get(dev, pipe) == 0)
|
|
vblank->inmodeset |= 0x2;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(drm_vblank_pre_modeset);
|
|
|
|
/**
|
|
* drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes
|
|
* @dev: DRM device
|
|
* @pipe: CRTC index
|
|
*
|
|
* This function again drops the temporary vblank reference acquired in
|
|
* drm_vblank_pre_modeset.
|
|
*/
|
|
void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
unsigned long irqflags;
|
|
|
|
/* vblank is not initialized (IRQ not installed ?), or has been freed */
|
|
if (!dev->num_crtcs)
|
|
return;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return;
|
|
|
|
if (vblank->inmodeset) {
|
|
spin_lock_irqsave(&dev->vbl_lock, irqflags);
|
|
drm_reset_vblank_timestamp(dev, pipe);
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
|
|
|
if (vblank->inmodeset & 0x2)
|
|
drm_vblank_put(dev, pipe);
|
|
|
|
vblank->inmodeset = 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(drm_vblank_post_modeset);
|
|
|
|
/*
|
|
* drm_modeset_ctl - handle vblank event counter changes across mode switch
|
|
* @DRM_IOCTL_ARGS: standard ioctl arguments
|
|
*
|
|
* Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET
|
|
* ioctls around modesetting so that any lost vblank events are accounted for.
|
|
*
|
|
* Generally the counter will reset across mode sets. If interrupts are
|
|
* enabled around this call, we don't have to do anything since the counter
|
|
* will have already been incremented.
|
|
*/
|
|
int drm_modeset_ctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_modeset_ctl *modeset = data;
|
|
unsigned int pipe;
|
|
|
|
/* If drm_vblank_init() hasn't been called yet, just no-op */
|
|
if (!dev->num_crtcs)
|
|
return 0;
|
|
|
|
/* KMS drivers handle this internally */
|
|
if (drm_core_check_feature(dev, DRIVER_MODESET))
|
|
return 0;
|
|
|
|
pipe = modeset->crtc;
|
|
if (pipe >= dev->num_crtcs)
|
|
return -EINVAL;
|
|
|
|
switch (modeset->cmd) {
|
|
case _DRM_PRE_MODESET:
|
|
drm_vblank_pre_modeset(dev, pipe);
|
|
break;
|
|
case _DRM_POST_MODESET:
|
|
drm_vblank_post_modeset(dev, pipe);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe,
|
|
union drm_wait_vblank *vblwait,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
struct drm_pending_vblank_event *e;
|
|
struct timeval now;
|
|
unsigned long flags;
|
|
unsigned int seq;
|
|
int ret;
|
|
|
|
e = kzalloc(sizeof(*e), GFP_KERNEL);
|
|
if (e == NULL) {
|
|
ret = -ENOMEM;
|
|
goto err_put;
|
|
}
|
|
|
|
e->pipe = pipe;
|
|
e->base.pid = current->pid;
|
|
e->event.base.type = DRM_EVENT_VBLANK;
|
|
e->event.base.length = sizeof(e->event);
|
|
e->event.user_data = vblwait->request.signal;
|
|
|
|
spin_lock_irqsave(&dev->event_lock, flags);
|
|
|
|
/*
|
|
* drm_vblank_off() might have been called after we called
|
|
* drm_vblank_get(). drm_vblank_off() holds event_lock
|
|
* around the vblank disable, so no need for further locking.
|
|
* The reference from drm_vblank_get() protects against
|
|
* vblank disable from another source.
|
|
*/
|
|
if (!vblank->enabled) {
|
|
ret = -EINVAL;
|
|
goto err_unlock;
|
|
}
|
|
|
|
ret = drm_event_reserve_init_locked(dev, file_priv, &e->base,
|
|
&e->event.base);
|
|
|
|
if (ret)
|
|
goto err_unlock;
|
|
|
|
seq = drm_vblank_count_and_time(dev, pipe, &now);
|
|
|
|
DRM_DEBUG("event on vblank count %u, current %u, crtc %u\n",
|
|
vblwait->request.sequence, seq, pipe);
|
|
|
|
trace_drm_vblank_event_queued(current->pid, pipe,
|
|
vblwait->request.sequence);
|
|
|
|
e->event.sequence = vblwait->request.sequence;
|
|
if ((seq - vblwait->request.sequence) <= (1 << 23)) {
|
|
drm_vblank_put(dev, pipe);
|
|
send_vblank_event(dev, e, seq, &now);
|
|
vblwait->reply.sequence = seq;
|
|
} else {
|
|
/* drm_handle_vblank_events will call drm_vblank_put */
|
|
list_add_tail(&e->base.link, &dev->vblank_event_list);
|
|
vblwait->reply.sequence = vblwait->request.sequence;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&dev->event_lock, flags);
|
|
|
|
return 0;
|
|
|
|
err_unlock:
|
|
spin_unlock_irqrestore(&dev->event_lock, flags);
|
|
kfree(e);
|
|
err_put:
|
|
drm_vblank_put(dev, pipe);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Wait for VBLANK.
|
|
*
|
|
* \param inode device inode.
|
|
* \param file_priv DRM file private.
|
|
* \param cmd command.
|
|
* \param data user argument, pointing to a drm_wait_vblank structure.
|
|
* \return zero on success or a negative number on failure.
|
|
*
|
|
* This function enables the vblank interrupt on the pipe requested, then
|
|
* sleeps waiting for the requested sequence number to occur, and drops
|
|
* the vblank interrupt refcount afterwards. (vblank IRQ disable follows that
|
|
* after a timeout with no further vblank waits scheduled).
|
|
*/
|
|
int drm_wait_vblank(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_vblank_crtc *vblank;
|
|
union drm_wait_vblank *vblwait = data;
|
|
int ret;
|
|
unsigned int flags, seq, pipe, high_pipe;
|
|
|
|
if (!dev->irq_enabled)
|
|
return -EINVAL;
|
|
|
|
if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
|
|
return -EINVAL;
|
|
|
|
if (vblwait->request.type &
|
|
~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
|
|
_DRM_VBLANK_HIGH_CRTC_MASK)) {
|
|
DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
|
|
vblwait->request.type,
|
|
(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
|
|
_DRM_VBLANK_HIGH_CRTC_MASK));
|
|
return -EINVAL;
|
|
}
|
|
|
|
flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
|
|
high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK);
|
|
if (high_pipe)
|
|
pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT;
|
|
else
|
|
pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
|
|
if (pipe >= dev->num_crtcs)
|
|
return -EINVAL;
|
|
|
|
vblank = &dev->vblank[pipe];
|
|
|
|
ret = drm_vblank_get(dev, pipe);
|
|
if (ret) {
|
|
DRM_DEBUG("failed to acquire vblank counter, %d\n", ret);
|
|
return ret;
|
|
}
|
|
seq = drm_vblank_count(dev, pipe);
|
|
|
|
switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
|
|
case _DRM_VBLANK_RELATIVE:
|
|
vblwait->request.sequence += seq;
|
|
vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
|
|
case _DRM_VBLANK_ABSOLUTE:
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
if ((flags & _DRM_VBLANK_NEXTONMISS) &&
|
|
(seq - vblwait->request.sequence) <= (1 << 23)) {
|
|
vblwait->request.sequence = seq + 1;
|
|
}
|
|
|
|
if (flags & _DRM_VBLANK_EVENT) {
|
|
/* must hold on to the vblank ref until the event fires
|
|
* drm_vblank_put will be called asynchronously
|
|
*/
|
|
return drm_queue_vblank_event(dev, pipe, vblwait, file_priv);
|
|
}
|
|
|
|
DRM_DEBUG("waiting on vblank count %u, crtc %u\n",
|
|
vblwait->request.sequence, pipe);
|
|
DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
|
|
(((drm_vblank_count(dev, pipe) -
|
|
vblwait->request.sequence) <= (1 << 23)) ||
|
|
!vblank->enabled ||
|
|
!dev->irq_enabled));
|
|
|
|
if (ret != -EINTR) {
|
|
struct timeval now;
|
|
|
|
vblwait->reply.sequence = drm_vblank_count_and_time(dev, pipe, &now);
|
|
vblwait->reply.tval_sec = now.tv_sec;
|
|
vblwait->reply.tval_usec = now.tv_usec;
|
|
|
|
DRM_DEBUG("returning %u to client\n",
|
|
vblwait->reply.sequence);
|
|
} else {
|
|
DRM_DEBUG("vblank wait interrupted by signal\n");
|
|
}
|
|
|
|
done:
|
|
drm_vblank_put(dev, pipe);
|
|
return ret;
|
|
}
|
|
|
|
static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_pending_vblank_event *e, *t;
|
|
struct timeval now;
|
|
unsigned int seq;
|
|
|
|
assert_spin_locked(&dev->event_lock);
|
|
|
|
seq = drm_vblank_count_and_time(dev, pipe, &now);
|
|
|
|
list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
|
|
if (e->pipe != pipe)
|
|
continue;
|
|
if ((seq - e->event.sequence) > (1<<23))
|
|
continue;
|
|
|
|
DRM_DEBUG("vblank event on %u, current %u\n",
|
|
e->event.sequence, seq);
|
|
|
|
list_del(&e->base.link);
|
|
drm_vblank_put(dev, pipe);
|
|
send_vblank_event(dev, e, seq, &now);
|
|
}
|
|
|
|
trace_drm_vblank_event(pipe, seq);
|
|
}
|
|
|
|
/**
|
|
* drm_handle_vblank - handle a vblank event
|
|
* @dev: DRM device
|
|
* @pipe: index of CRTC where this event occurred
|
|
*
|
|
* Drivers should call this routine in their vblank interrupt handlers to
|
|
* update the vblank counter and send any signals that may be pending.
|
|
*
|
|
* This is the legacy version of drm_crtc_handle_vblank().
|
|
*/
|
|
bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
|
|
unsigned long irqflags;
|
|
|
|
if (WARN_ON_ONCE(!dev->num_crtcs))
|
|
return false;
|
|
|
|
if (WARN_ON(pipe >= dev->num_crtcs))
|
|
return false;
|
|
|
|
spin_lock_irqsave(&dev->event_lock, irqflags);
|
|
|
|
/* Need timestamp lock to prevent concurrent execution with
|
|
* vblank enable/disable, as this would cause inconsistent
|
|
* or corrupted timestamps and vblank counts.
|
|
*/
|
|
spin_lock(&dev->vblank_time_lock);
|
|
|
|
/* Vblank irq handling disabled. Nothing to do. */
|
|
if (!vblank->enabled) {
|
|
spin_unlock(&dev->vblank_time_lock);
|
|
spin_unlock_irqrestore(&dev->event_lock, irqflags);
|
|
return false;
|
|
}
|
|
|
|
drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ);
|
|
|
|
spin_unlock(&dev->vblank_time_lock);
|
|
|
|
wake_up(&vblank->queue);
|
|
drm_handle_vblank_events(dev, pipe);
|
|
|
|
spin_unlock_irqrestore(&dev->event_lock, irqflags);
|
|
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL(drm_handle_vblank);
|
|
|
|
/**
|
|
* drm_crtc_handle_vblank - handle a vblank event
|
|
* @crtc: where this event occurred
|
|
*
|
|
* Drivers should call this routine in their vblank interrupt handlers to
|
|
* update the vblank counter and send any signals that may be pending.
|
|
*
|
|
* This is the native KMS version of drm_handle_vblank().
|
|
*
|
|
* Returns:
|
|
* True if the event was successfully handled, false on failure.
|
|
*/
|
|
bool drm_crtc_handle_vblank(struct drm_crtc *crtc)
|
|
{
|
|
return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_handle_vblank);
|
|
|
|
/**
|
|
* drm_vblank_no_hw_counter - "No hw counter" implementation of .get_vblank_counter()
|
|
* @dev: DRM device
|
|
* @pipe: CRTC for which to read the counter
|
|
*
|
|
* Drivers can plug this into the .get_vblank_counter() function if
|
|
* there is no useable hardware frame counter available.
|
|
*
|
|
* Returns:
|
|
* 0
|
|
*/
|
|
u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe)
|
|
{
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_vblank_no_hw_counter);
|