[PATCH] drm: Extract drm_vblank.[hc]
Daniel Vetter
daniel at ffwll.ch
Thu Jun 1 05:55:01 UTC 2017
On Wed, May 31, 2017 at 10:51:11AM -0700, Stefan Agner wrote:
> On 2017-05-31 02:21, Daniel Vetter wrote:
> > drm_irq.c contains both the irq helper library (optional) and the
> > vblank support (optional, but part of the modeset uapi, and doesn't
> > require the use of the irq helpers at all.
> >
> > Split this up for more clarity of the scope of the individual bits.
> >
> > v2: Move misplaced hunks to this patch (Stefan).
> >
>
> Looks good to me:
>
> Reviewed-by: Stefan Agner <stefan at agner.ch>
Thanks for your review, I applied the these two patches.
-Daniel
>
> --
> Stefan
>
> > Cc: Stefan Agner <stefan at agner.ch>
> > Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> > ---
> > Documentation/gpu/drm-internals.rst | 9 +
> > Documentation/gpu/drm-kms.rst | 4 +-
> > drivers/gpu/drm/Makefile | 2 +-
> > drivers/gpu/drm/drm_internal.h | 3 +-
> > drivers/gpu/drm/drm_irq.c | 1623 +---------------------------------
> > drivers/gpu/drm/drm_vblank.c | 1645 +++++++++++++++++++++++++++++++++++
> > include/drm/drmP.h | 5 +-
> > include/drm/drm_file.h | 1 +
> > include/drm/drm_irq.h | 158 +---
> > include/drm/drm_prime.h | 2 +
> > include/drm/drm_vblank.h | 181 ++++
> > 11 files changed, 1869 insertions(+), 1764 deletions(-)
> > create mode 100644 drivers/gpu/drm/drm_vblank.c
> > create mode 100644 include/drm/drm_vblank.h
> >
> > diff --git a/Documentation/gpu/drm-internals.rst
> > b/Documentation/gpu/drm-internals.rst
> > index d218dd29221a..dd28e39cf966 100644
> > --- a/Documentation/gpu/drm-internals.rst
> > +++ b/Documentation/gpu/drm-internals.rst
> > @@ -204,6 +204,15 @@ drm_device <drm_device>` irq_enabled field to 1 upon
> > registration of the IRQs, and clear it to 0 after unregistering the
> > IRQs.
> >
> > +IRQ Helper Library
> > +~~~~~~~~~~~~~~~~~~
> > +
> > +.. kernel-doc:: drivers/gpu/drm/drm_irq.c
> > + :doc: irq helpers
> > +
> > +.. kernel-doc:: drivers/gpu/drm/drm_irq.c
> > + :export:
> > +
> > Memory Manager Initialization
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst
> > index bfecd21a8cdf..2d77c9580164 100644
> > --- a/Documentation/gpu/drm-kms.rst
> > +++ b/Documentation/gpu/drm-kms.rst
> > @@ -612,8 +612,8 @@ operation handler.
> > Vertical Blanking and Interrupt Handling Functions Reference
> > ------------------------------------------------------------
> >
> > -.. kernel-doc:: include/drm/drm_irq.h
> > +.. kernel-doc:: include/drm/drm_vblank.h
> > :internal:
> >
> > -.. kernel-doc:: drivers/gpu/drm/drm_irq.c
> > +.. kernel-doc:: drivers/gpu/drm/drm_vblank.c
> > :export:
> > diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> > index c156fecfb362..acc88942c2e5 100644
> > --- a/drivers/gpu/drm/Makefile
> > +++ b/drivers/gpu/drm/Makefile
> > @@ -16,7 +16,7 @@ drm-y := drm_auth.o drm_bufs.o drm_cache.o \
> > drm_framebuffer.o drm_connector.o drm_blend.o \
> > drm_encoder.o drm_mode_object.o drm_property.o \
> > drm_plane.o drm_color_mgmt.o drm_print.o \
> > - drm_dumb_buffers.o drm_mode_config.o
> > + drm_dumb_buffers.o drm_mode_config.o drm_vblank.o
> >
> > drm-$(CONFIG_DRM_LIB_RANDOM) += lib/drm_random.o
> > drm-$(CONFIG_DRM_VM) += drm_vm.o
> > diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
> > index bca2c66c5d28..6a0cbcc84534 100644
> > --- a/drivers/gpu/drm/drm_internal.h
> > +++ b/drivers/gpu/drm/drm_internal.h
> > @@ -54,8 +54,9 @@ int drm_name_info(struct seq_file *m, void *data);
> > int drm_clients_info(struct seq_file *m, void* data);
> > int drm_gem_name_info(struct seq_file *m, void *data);
> >
> > -/* drm_irq.c */
> > +/* drm_vblank.c */
> > extern unsigned int drm_timestamp_monotonic;
> > +void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe);
> >
> > /* IOCTLS */
> > int drm_wait_vblank(struct drm_device *dev, void *data,
> > diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> > index c7debaad67f8..28d736c3fcb4 100644
> > --- a/drivers/gpu/drm/drm_irq.c
> > +++ b/drivers/gpu/drm/drm_irq.c
> > @@ -3,6 +3,25 @@
> > *
> > * \author Rickard E. (Rik) Faith <faith at valinux.com>
> > * \author Gareth Hughes <gareth at valinux.com>
> > + *
> > + * Permission is hereby granted, free of charge, to any person obtaining a
> > + * copy of this software and associated documentation files (the "Software"),
> > + * to deal in the Software without restriction, including without limitation
> > + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> > + * and/or sell copies of the Software, and to permit persons to whom the
> > + * Software is furnished to do so, subject to the following conditions:
> > + *
> > + * The above copyright notice and this permission notice (including the next
> > + * paragraph) shall be included in all copies or substantial portions of the
> > + * Software.
> > + *
> > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> > + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> > + * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
> > + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> > + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> > + * OTHER DEALINGS IN THE SOFTWARE.
> > */
> >
> > /*
> > @@ -32,429 +51,15 @@
> > * OTHER DEALINGS IN THE SOFTWARE.
> > */
> >
> > +#include <drm/drm_irq.h>
> > #include <drm/drmP.h>
> > -#include "drm_trace.h"
> > -#include "drm_internal.h"
> >
> > #include <linux/interrupt.h> /* For task queue support */
> > -#include <linux/slab.h>
> >
> > #include <linux/vgaarb.h>
> > #include <linux/export.h>
> >
> > -/* Retry timestamp calculation up to 3 times to satisfy
> > - * drm_timestamp_precision before giving up.
> > - */
> > -#define DRM_TIMESTAMP_MAXRETRIES 3
> > -
> > -/* Threshold in nanoseconds for detection of redundant
> > - * vblank irq in drm_handle_vblank(). 1 msec should be ok.
> > - */
> > -#define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
> > -
> > -static bool
> > -drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
> > - struct timeval *tvblank, bool in_vblank_irq);
> > -
> > -static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
> > -
> > -/*
> > - * Default to use monotonic timestamps for wait-for-vblank and page-flip
> > - * complete events.
> > - */
> > -unsigned int drm_timestamp_monotonic = 1;
> > -
> > -static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */
> > -
> > -module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
> > -module_param_named(timestamp_precision_usec, drm_timestamp_precision,
> > int, 0600);
> > -module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
> > -MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable
> > [msecs] (0: never disable, <0: disable immediately)");
> > -MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
> > -MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");
> > -
> > -static void store_vblank(struct drm_device *dev, unsigned int pipe,
> > - u32 vblank_count_inc,
> > - struct timeval *t_vblank, u32 last)
> > -{
> > - struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
> > -
> > - assert_spin_locked(&dev->vblank_time_lock);
> > -
> > - vblank->last = last;
> > -
> > - write_seqlock(&vblank->seqlock);
> > - vblank->time = *t_vblank;
> > - vblank->count += vblank_count_inc;
> > - write_sequnlock(&vblank->seqlock);
> > -}
> > -
> > -/*
> > - * "No hw counter" fallback implementation of .get_vblank_counter() hook,
> > - * if there is no useable hardware frame counter available.
> > - */
> > -static u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe)
> > -{
> > - WARN_ON_ONCE(dev->max_vblank_count != 0);
> > - return 0;
> > -}
> > -
> > -static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe)
> > -{
> > - if (drm_core_check_feature(dev, DRIVER_MODESET)) {
> > - struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe);
> > -
> > - if (crtc->funcs->get_vblank_counter)
> > - return crtc->funcs->get_vblank_counter(crtc);
> > - }
> > -
> > - if (dev->driver->get_vblank_counter)
> > - return dev->driver->get_vblank_counter(dev, pipe);
> > -
> > - return drm_vblank_no_hw_counter(dev, pipe);
> > -}
> > -
> > -/*
> > - * Reset the stored timestamp for the current vblank count to correspond
> > - * to the last vblank occurred.
> > - *
> > - * Only to be called from drm_crtc_vblank_on().
> > - *
> > - * Note: caller must hold &drm_device.vbl_lock since this reads & writes
> > - * device vblank fields.
> > - */
> > -static void drm_reset_vblank_timestamp(struct drm_device *dev,
> > unsigned int pipe)
> > -{
> > - u32 cur_vblank;
> > - bool rc;
> > - struct timeval t_vblank;
> > - int count = DRM_TIMESTAMP_MAXRETRIES;
> > -
> > - spin_lock(&dev->vblank_time_lock);
> > -
> > - /*
> > - * sample the current counter to avoid random jumps
> > - * when drm_vblank_enable() applies the diff
> > - */
> > - do {
> > - cur_vblank = __get_vblank_counter(dev, pipe);
> > - rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false);
> > - } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
> > -
> > - /*
> > - * Only reinitialize corresponding vblank timestamp if high-precision query
> > - * available and didn't fail. Otherwise reinitialize delayed at next vblank
> > - * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid.
> > - */
> > - if (!rc)
> > - t_vblank = (struct timeval) {0, 0};
> > -
> > - /*
> > - * +1 to make sure user will never see the same
> > - * vblank counter value before and after a modeset
> > - */
> > - store_vblank(dev, pipe, 1, &t_vblank, cur_vblank);
> > -
> > - spin_unlock(&dev->vblank_time_lock);
> > -}
> > -
> > -/*
> > - * Call back into the driver to update the appropriate vblank counter
> > - * (specified by @pipe). Deal with wraparound, if it occurred, and
> > - * update the last read value so we can deal with wraparound on the next
> > - * call if necessary.
> > - *
> > - * Only necessary when going from off->on, to account for frames we
> > - * didn't get an interrupt for.
> > - *
> > - * Note: caller must hold &drm_device.vbl_lock since this reads & writes
> > - * device vblank fields.
> > - */
> > -static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
> > - bool in_vblank_irq)
> > -{
> > - struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
> > - u32 cur_vblank, diff;
> > - bool rc;
> > - struct timeval t_vblank;
> > - int count = DRM_TIMESTAMP_MAXRETRIES;
> > - int framedur_ns = vblank->framedur_ns;
> > -
> > - /*
> > - * Interrupts were disabled prior to this call, so deal with counter
> > - * wrap if needed.
> > - * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events
> > - * here if the register is small or we had vblank interrupts off for
> > - * a long time.
> > - *
> > - * We repeat the hardware vblank counter & timestamp query until
> > - * we get consistent results. This to prevent races between gpu
> > - * updating its hardware counter while we are retrieving the
> > - * corresponding vblank timestamp.
> > - */
> > - do {
> > - cur_vblank = __get_vblank_counter(dev, pipe);
> > - rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq);
> > - } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
> > -
> > - if (dev->max_vblank_count != 0) {
> > - /* trust the hw counter when it's around */
> > - diff = (cur_vblank - vblank->last) & dev->max_vblank_count;
> > - } else if (rc && framedur_ns) {
> > - const struct timeval *t_old;
> > - u64 diff_ns;
> > -
> > - t_old = &vblank->time;
> > - diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old);
> > -
> > - /*
> > - * Figure out how many vblanks we've missed based
> > - * on the difference in the timestamps and the
> > - * frame/field duration.
> > - */
> > - diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);
> > -
> > - if (diff == 0 && in_vblank_irq)
> > - DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored."
> > - " diff_ns = %lld, framedur_ns = %d)\n",
> > - pipe, (long long) diff_ns, framedur_ns);
> > - } else {
> > - /* some kind of default for drivers w/o accurate vbl timestamping */
> > - diff = in_vblank_irq ? 1 : 0;
> > - }
> > -
> > - /*
> > - * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset
> > - * interval? If so then vblank irqs keep running and it will likely
> > - * happen that the hardware vblank counter is not trustworthy as it
> > - * might reset at some point in that interval and vblank timestamps
> > - * are not trustworthy either in that interval. Iow. this can result
> > - * in a bogus diff >> 1 which must be avoided as it would cause
> > - * random large forward jumps of the software vblank counter.
> > - */
> > - if (diff > 1 && (vblank->inmodeset & 0x2)) {
> > - DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u"
> > - " due to pre-modeset.\n", pipe, diff);
> > - diff = 1;
> > - }
> > -
> > - DRM_DEBUG_VBL("updating vblank count on crtc %u:"
> > - " current=%u, diff=%u, hw=%u hw_last=%u\n",
> > - pipe, vblank->count, diff, cur_vblank, vblank->last);
> > -
> > - if (diff == 0) {
> > - WARN_ON_ONCE(cur_vblank != vblank->last);
> > - return;
> > - }
> > -
> > - /*
> > - * Only reinitialize corresponding vblank timestamp if high-precision query
> > - * available and didn't fail, or we were called from the vblank interrupt.
> > - * Otherwise reinitialize delayed at next vblank interrupt and assign 0
> > - * for now, to mark the vblanktimestamp as invalid.
> > - */
> > - if (!rc && in_vblank_irq)
> > - t_vblank = (struct timeval) {0, 0};
> > -
> > - store_vblank(dev, pipe, diff, &t_vblank, cur_vblank);
> > -}
> > -
> > -static 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;
> > -}
> > -
> > -/**
> > - * drm_accurate_vblank_count - retrieve the master vblank counter
> > - * @crtc: which counter to retrieve
> > - *
> > - * This function is similar to @drm_crtc_vblank_count but this
> > - * function interpolates to handle a race with vblank irq's.
> > - *
> > - * This is mostly useful for hardware that can obtain the scanout
> > - * position, but doesn't have a frame counter.
> > - */
> > -u32 drm_accurate_vblank_count(struct drm_crtc *crtc)
> > -{
> > - struct drm_device *dev = crtc->dev;
> > - unsigned int pipe = drm_crtc_index(crtc);
> > - u32 vblank;
> > - unsigned long flags;
> > -
> > - WARN(!dev->driver->get_vblank_timestamp,
> > - "This function requires support for accurate vblank timestamps.");
> > -
> > - spin_lock_irqsave(&dev->vblank_time_lock, flags);
> > -
> > - drm_update_vblank_count(dev, pipe, false);
> > - vblank = drm_vblank_count(dev, pipe);
> > -
> > - spin_unlock_irqrestore(&dev->vblank_time_lock, flags);
> > -
> > - return vblank;
> > -}
> > -EXPORT_SYMBOL(drm_accurate_vblank_count);
> > -
> > -static void __disable_vblank(struct drm_device *dev, unsigned int pipe)
> > -{
> > - if (drm_core_check_feature(dev, DRIVER_MODESET)) {
> > - struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe);
> > -
> > - if (crtc->funcs->disable_vblank) {
> > - crtc->funcs->disable_vblank(crtc);
> > - return;
> > - }
> > - }
> > -
> > - dev->driver->disable_vblank(dev, pipe);
> > -}
> > -
> > -/*
> > - * Disable vblank irq's on crtc, make sure that last vblank count
> > - * of hardware and corresponding consistent software vblank counter
> > - * are preserved, even if there are any spurious vblank irq's after
> > - * disable.
> > - */
> > -static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe)
> > -{
> > - struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
> > - unsigned long irqflags;
> > -
> > - assert_spin_locked(&dev->vbl_lock);
> > -
> > - /* Prevent vblank irq processing while disabling vblank irqs,
> > - * so no updates of timestamps or count can happen after we've
> > - * disabled. Needed to prevent races in case of delayed irq's.
> > - */
> > - spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
> > -
> > - /*
> > - * Only disable vblank interrupts if they're enabled. This avoids
> > - * calling the ->disable_vblank() operation in atomic context with the
> > - * hardware potentially runtime suspended.
> > - */
> > - if (vblank->enabled) {
> > - __disable_vblank(dev, pipe);
> > - vblank->enabled = false;
> > - }
> > -
> > - /*
> > - * Always update the count and timestamp to maintain the
> > - * appearance that the counter has been ticking all along until
> > - * this time. This makes the count account for the entire time
> > - * between drm_crtc_vblank_on() and drm_crtc_vblank_off().
> > - */
> > - drm_update_vblank_count(dev, pipe, false);
> > -
> > - spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
> > -}
> > -
> > -static void vblank_disable_fn(unsigned long arg)
> > -{
> > - struct drm_vblank_crtc *vblank = (void *)arg;
> > - struct drm_device *dev = vblank->dev;
> > - unsigned int pipe = vblank->pipe;
> > - unsigned long irqflags;
> > -
> > - spin_lock_irqsave(&dev->vbl_lock, irqflags);
> > - if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) {
> > - DRM_DEBUG("disabling vblank on crtc %u\n", pipe);
> > - vblank_disable_and_save(dev, pipe);
> > - }
> > - spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
> > -}
> > -
> > -/**
> > - * drm_vblank_cleanup - cleanup vblank support
> > - * @dev: DRM device
> > - *
> > - * This function cleans up any resources allocated in drm_vblank_init.
> > - */
> > -void drm_vblank_cleanup(struct drm_device *dev)
> > -{
> > - unsigned int pipe;
> > -
> > - /* Bail if the driver didn't call drm_vblank_init() */
> > - if (dev->num_crtcs == 0)
> > - return;
> > -
> > - for (pipe = 0; pipe < dev->num_crtcs; pipe++) {
> > - struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
> > -
> > - WARN_ON(READ_ONCE(vblank->enabled) &&
> > - drm_core_check_feature(dev, DRIVER_MODESET));
> > -
> > - del_timer_sync(&vblank->disable_timer);
> > - }
> > -
> > - kfree(dev->vblank);
> > -
> > - dev->num_crtcs = 0;
> > -}
> > -EXPORT_SYMBOL(drm_vblank_cleanup);
> > -
> > -/**
> > - * drm_vblank_init - initialize vblank support
> > - * @dev: DRM device
> > - * @num_crtcs: number of CRTCs supported by @dev
> > - *
> > - * This function initializes vblank support for @num_crtcs display pipelines.
> > - *
> > - * Returns:
> > - * Zero on success or a negative error code on failure.
> > - */
> > -int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
> > -{
> > - int ret = -ENOMEM;
> > - unsigned int i;
> > -
> > - spin_lock_init(&dev->vbl_lock);
> > - spin_lock_init(&dev->vblank_time_lock);
> > -
> > - dev->num_crtcs = num_crtcs;
> > -
> > - dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL);
> > - if (!dev->vblank)
> > - goto err;
> > -
> > - for (i = 0; i < num_crtcs; i++) {
> > - struct drm_vblank_crtc *vblank = &dev->vblank[i];
> > -
> > - vblank->dev = dev;
> > - vblank->pipe = i;
> > - init_waitqueue_head(&vblank->queue);
> > - setup_timer(&vblank->disable_timer, vblank_disable_fn,
> > - (unsigned long)vblank);
> > - seqlock_init(&vblank->seqlock);
> > - }
> > -
> > - DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n");
> > -
> > - /* Driver specific high-precision vblank timestamping supported? */
> > - if (dev->driver->get_vblank_timestamp)
> > - DRM_INFO("Driver supports precise vblank timestamp query.\n");
> > - else
> > - DRM_INFO("No driver support for vblank timestamp query.\n");
> > -
> > - /* Must have precise timestamping for reliable vblank instant disable */
> > - if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) {
> > - dev->vblank_disable_immediate = false;
> > - DRM_INFO("Setting vblank_disable_immediate to false because "
> > - "get_vblank_timestamp == NULL\n");
> > - }
> > -
> > - return 0;
> > -
> > -err:
> > - dev->num_crtcs = 0;
> > - return ret;
> > -}
> > -EXPORT_SYMBOL(drm_vblank_init);
> > +#include "drm_internal.h"
> >
> > /**
> > * drm_irq_install - install IRQ handler
> > @@ -571,7 +176,7 @@ int drm_irq_uninstall(struct drm_device *dev)
> >
> > WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET));
> >
> > - vblank_disable_and_save(dev, i);
> > + drm_vblank_disable_and_save(dev, i);
> > wake_up(&vblank->queue);
> > }
> > spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
> > @@ -634,1187 +239,3 @@ int drm_legacy_irq_control(struct drm_device
> > *dev, void *data,
> > 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;
> > - vblank->hwmode = *mode;
> > -
> > - 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
> > - * @in_vblank_irq:
> > - * True when called from drm_crtc_handle_vblank(). Some drivers
> > - * need to apply some workarounds for gpu-specific vblank irq quirks
> > - * if flag is set.
> > - *
> > - * 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.
> > - *
> > - * This function can be used to implement the &drm_driver.get_vblank_timestamp
> > - * directly, if the driver implements the
> > &drm_driver.get_scanout_position hook.
> > - *
> > - * Note that atomic drivers must call drm_calc_timestamping_constants() before
> > - * enabling a CRTC. The atomic helpers already take care of that in
> > - * drm_atomic_helper_update_legacy_modeset_state().
> > - *
> > - * Returns:
> > - *
> > - * Returns true on success, and false on failure, i.e. when no accurate
> > - * timestamp could be acquired.
> > - */
> > -bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> > - unsigned int pipe,
> > - int *max_error,
> > - struct timeval *vblank_time,
> > - bool in_vblank_irq)
> > -{
> > - struct timeval tv_etime;
> > - ktime_t stime, etime;
> > - bool vbl_status;
> > - struct drm_crtc *crtc;
> > - const struct drm_display_mode *mode;
> > - struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
> > - int vpos, hpos, i;
> > - int delta_ns, duration_ns;
> > -
> > - if (!drm_core_check_feature(dev, DRIVER_MODESET))
> > - return false;
> > -
> > - crtc = drm_crtc_from_index(dev, pipe);
> > -
> > - if (pipe >= dev->num_crtcs || !crtc) {
> > - DRM_ERROR("Invalid crtc %u\n", pipe);
> > - return false;
> > - }
> > -
> > - /* 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 false;
> > - }
> > -
> > - if (drm_drv_uses_atomic_modeset(dev))
> > - mode = &vblank->hwmode;
> > - else
> > - mode = &crtc->hwmode;
> > -
> > - /* 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);
> > - WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev));
> > -
> > - return false;
> > - }
> > -
> > - /* 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,
> > - in_vblank_irq,
> > - &vpos, &hpos,
> > - &stime, &etime,
> > - mode);
> > -
> > - /* Return as no-op if scanout query unsupported or failed. */
> > - if (!vbl_status) {
> > - DRM_DEBUG("crtc %u : scanoutpos query failed.\n",
> > - pipe);
> > - return false;
> > - }
> > -
> > - /* 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;
> > -
> > - /* 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 p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",
> > - pipe, 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 true;
> > -}
> > -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
> > - * @in_vblank_irq:
> > - * True when called from drm_crtc_handle_vblank(). Some drivers
> > - * need to apply some workarounds for gpu-specific vblank irq quirks
> > - * if flag is set.
> > - *
> > - * 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, bool in_vblank_irq)
> > -{
> > - bool ret = false;
> > -
> > - /* 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, in_vblank_irq);
> > -
> > - /* GPU high precision timestamp query unsupported or failed.
> > - * Return current monotonic/gettimeofday timestamp as best estimate.
> > - */
> > - if (!ret)
> > - *tvblank = get_drm_timestamp();
> > -
> > - return ret;
> > -}
> > -
> > -/**
> > - * 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.
> > - *
> > - * 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)) {
> > - *vblanktime = (struct timeval) { 0 };
> > - 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.file_priv, 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.
> > - *
> > - * NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an
> > - * atomic commit must ensure that the next vblank happens at exactly the same
> > - * time as the atomic commit is committed to the hardware. This function itself
> > - * does **not** protect again the next vblank interrupt racing with either this
> > - * function call or the atomic commit operation. A possible sequence could be:
> > - *
> > - * 1. Driver commits new hardware state into vblank-synchronized registers.
> > - * 2. A vblank happens, committing the hardware state. Also the corresponding
> > - * vblank interrupt is fired off and fully processed by the interrupt
> > - * handler.
> > - * 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event().
> > - * 4. The event is only send out for the next vblank, which is wrong.
> > - *
> > - * An equivalent race can happen when the driver calls
> > - * drm_crtc_arm_vblank_event() before writing out the new hardware state.
> > - *
> > - * The only way to make this work safely is to prevent the vblank from firing
> > - * (and the hardware from committing anything else) until the entire atomic
> > - * commit sequence has run to completion. If the hardware does not have such a
> > - * feature (e.g. using a "go" bit), then it is unsafe to use this functions.
> > - * Instead drivers need to manually send out the event from their interrupt
> > - * handler by calling drm_crtc_send_vblank_event() and make sure that
> > there's no
> > - * possible race with the hardware committing the atomic update.
> > - *
> > - * 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);
> > - e->event.crtc_id = crtc->base.id;
> > - 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 for the most recently processed
> > - * vblank, and sends it to userspace. Caller must hold event lock.
> > - *
> > - * See drm_crtc_arm_vblank_event() for a helper which can be used in certain
> > - * situation, especially to send out events for atomic commit operations.
> > - */
> > -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;
> > - e->event.crtc_id = crtc->base.id;
> > - send_vblank_event(dev, e, seq, &now);
> > -}
> > -EXPORT_SYMBOL(drm_crtc_send_vblank_event);
> > -
> > -static int __enable_vblank(struct drm_device *dev, unsigned int pipe)
> > -{
> > - if (drm_core_check_feature(dev, DRIVER_MODESET)) {
> > - struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe);
> > -
> > - if (crtc->funcs->enable_vblank)
> > - return crtc->funcs->enable_vblank(crtc);
> > - }
> > -
> > - return dev->driver->enable_vblank(dev, pipe);
> > -}
> > -
> > -/**
> > - * 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 = __enable_vblank(dev, pipe);
> > - DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret);
> > - if (ret) {
> > - atomic_dec(&vblank->refcount);
> > - } else {
> > - drm_update_vblank_count(dev, pipe, 0);
> > - /* drm_update_vblank_count() includes a wmb so we just
> > - * need to ensure that the compiler emits the write
> > - * to mark the vblank as enabled after the call
> > - * to drm_update_vblank_count().
> > - */
> > - WRITE_ONCE(vblank->enabled, true);
> > - }
> > - }
> > -
> > - 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 (drm_vblank_offdelay < 0)
> > - vblank_disable_fn((unsigned long)vblank);
> > - else if (!dev->vblank_disable_immediate)
> > - 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_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.
> > - */
> > -void drm_crtc_vblank_off(struct drm_crtc *crtc)
> > -{
> > - struct drm_device *dev = crtc->dev;
> > - unsigned int pipe = drm_crtc_index(crtc);
> > - 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_crtc_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);
> > -
> > - /* Will be reset by the modeset helpers when re-enabling the crtc by
> > - * calling drm_calc_timestamping_constants(). */
> > - vblank->hwmode.crtc_clock = 0;
> > -}
> > -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_crtc_vblank_on - enable vblank events on a CRTC
> > - * @crtc: CRTC in question
> > - *
> > - * This functions restores the vblank interrupt state captured with
> > - * drm_crtc_vblank_off() again. Note that calls to drm_crtc_vblank_on() and
> > - * drm_crtc_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.
> > - */
> > -void drm_crtc_vblank_on(struct drm_crtc *crtc)
> > -{
> > - struct drm_device *dev = crtc->dev;
> > - unsigned int pipe = drm_crtc_index(crtc);
> > - 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_crtc_vblank_on);
> > -
> > -static void drm_legacy_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;
> > - }
> > -}
> > -
> > -static void drm_legacy_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;
> > - }
> > -}
> > -
> > -int drm_legacy_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_LEGACY))
> > - return 0;
> > -
> > - pipe = modeset->crtc;
> > - if (pipe >= dev->num_crtcs)
> > - return -EINVAL;
> > -
> > - switch (modeset->cmd) {
> > - case _DRM_PRE_MODESET:
> > - drm_legacy_vblank_pre_modeset(dev, pipe);
> > - break;
> > - case _DRM_POST_MODESET:
> > - drm_legacy_vblank_post_modeset(dev, pipe);
> > - break;
> > - default:
> > - return -EINVAL;
> > - }
> > -
> > - return 0;
> > -}
> > -
> > -static inline bool vblank_passed(u32 seq, u32 ref)
> > -{
> > - return (seq - ref) <= (1 << 23);
> > -}
> > -
> > -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->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_crtc_vblank_off() might have been called after we called
> > - * drm_vblank_get(). drm_crtc_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 (!READ_ONCE(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(file_priv, pipe,
> > - vblwait->request.sequence);
> > -
> > - e->event.sequence = vblwait->request.sequence;
> > - if (vblank_passed(seq, vblwait->request.sequence)) {
> > - 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;
> > -}
> > -
> > -static bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait)
> > -{
> > - if (vblwait->request.sequence)
> > - return false;
> > -
> > - return _DRM_VBLANK_RELATIVE ==
> > - (vblwait->request.type & (_DRM_VBLANK_TYPES_MASK |
> > - _DRM_VBLANK_EVENT |
> > - _DRM_VBLANK_NEXTONMISS));
> > -}
> > -
> > -/*
> > - * 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];
> > -
> > - /* If the counter is currently enabled and accurate, short-circuit
> > - * queries to return the cached timestamp of the last vblank.
> > - */
> > - if (dev->vblank_disable_immediate &&
> > - drm_wait_vblank_is_query(vblwait) &&
> > - READ_ONCE(vblank->enabled)) {
> > - 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;
> > - return 0;
> > - }
> > -
> > - ret = drm_vblank_get(dev, pipe);
> > - if (ret) {
> > - DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, 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) &&
> > - vblank_passed(seq, vblwait->request.sequence))
> > - 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);
> > - }
> > -
> > - if (vblwait->request.sequence != seq) {
> > - DRM_DEBUG("waiting on vblank count %u, crtc %u\n",
> > - vblwait->request.sequence, pipe);
> > - DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
> > - vblank_passed(drm_vblank_count(dev, pipe),
> > - vblwait->request.sequence) ||
> > - !READ_ONCE(vblank->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("crtc %d returning %u to client\n",
> > - pipe, vblwait->reply.sequence);
> > - } else {
> > - DRM_DEBUG("crtc %d vblank wait interrupted by signal\n", pipe);
> > - }
> > -
> > -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 (!vblank_passed(seq, e->event.sequence))
> > - 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;
> > - bool disable_irq;
> > -
> > - 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, true);
> > -
> > - spin_unlock(&dev->vblank_time_lock);
> > -
> > - wake_up(&vblank->queue);
> > -
> > - /* With instant-off, we defer disabling the interrupt until after
> > - * we finish processing the following vblank after all events have
> > - * been signaled. The disable has to be last (after
> > - * drm_handle_vblank_events) so that the timestamp is always accurate.
> > - */
> > - disable_irq = (dev->vblank_disable_immediate &&
> > - drm_vblank_offdelay > 0 &&
> > - !atomic_read(&vblank->refcount));
> > -
> > - drm_handle_vblank_events(dev, pipe);
> > -
> > - spin_unlock_irqrestore(&dev->event_lock, irqflags);
> > -
> > - if (disable_irq)
> > - vblank_disable_fn((unsigned long)vblank);
> > -
> > - 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);
> > diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
> > new file mode 100644
> > index 000000000000..630dc26379b7
> > --- /dev/null
> > +++ b/drivers/gpu/drm/drm_vblank.c
> > @@ -0,0 +1,1645 @@
> > +/*
> > + * drm_irq.c IRQ and vblank support
> > + *
> > + * \author Rickard E. (Rik) Faith <faith at valinux.com>
> > + * \author Gareth Hughes <gareth at valinux.com>
> > + *
> > + * Permission is hereby granted, free of charge, to any person obtaining a
> > + * copy of this software and associated documentation files (the "Software"),
> > + * to deal in the Software without restriction, including without limitation
> > + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> > + * and/or sell copies of the Software, and to permit persons to whom the
> > + * Software is furnished to do so, subject to the following conditions:
> > + *
> > + * The above copyright notice and this permission notice (including the next
> > + * paragraph) shall be included in all copies or substantial portions of the
> > + * Software.
> > + *
> > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> > + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> > + * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
> > + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> > + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> > + * OTHER DEALINGS IN THE SOFTWARE.
> > + */
> > +
> > +#include <drm/drm_vblank.h>
> > +#include <drm/drmP.h>
> > +#include <linux/export.h>
> > +
> > +#include "drm_trace.h"
> > +#include "drm_internal.h"
> > +
> > +/* Retry timestamp calculation up to 3 times to satisfy
> > + * drm_timestamp_precision before giving up.
> > + */
> > +#define DRM_TIMESTAMP_MAXRETRIES 3
> > +
> > +/* Threshold in nanoseconds for detection of redundant
> > + * vblank irq in drm_handle_vblank(). 1 msec should be ok.
> > + */
> > +#define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
> > +
> > +static bool
> > +drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
> > + struct timeval *tvblank, bool in_vblank_irq);
> > +
> > +static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
> > +
> > +/*
> > + * Default to use monotonic timestamps for wait-for-vblank and page-flip
> > + * complete events.
> > + */
> > +unsigned int drm_timestamp_monotonic = 1;
> > +
> > +static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */
> > +
> > +module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
> > +module_param_named(timestamp_precision_usec, drm_timestamp_precision,
> > int, 0600);
> > +module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
> > +MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable
> > [msecs] (0: never disable, <0: disable immediately)");
> > +MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
> > +MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");
> > +
> > +static void store_vblank(struct drm_device *dev, unsigned int pipe,
> > + u32 vblank_count_inc,
> > + struct timeval *t_vblank, u32 last)
> > +{
> > + struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
> > +
> > + assert_spin_locked(&dev->vblank_time_lock);
> > +
> > + vblank->last = last;
> > +
> > + write_seqlock(&vblank->seqlock);
> > + vblank->time = *t_vblank;
> > + vblank->count += vblank_count_inc;
> > + write_sequnlock(&vblank->seqlock);
> > +}
> > +
> > +/*
> > + * "No hw counter" fallback implementation of .get_vblank_counter() hook,
> > + * if there is no useable hardware frame counter available.
> > + */
> > +static u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe)
> > +{
> > + WARN_ON_ONCE(dev->max_vblank_count != 0);
> > + return 0;
> > +}
> > +
> > +static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe)
> > +{
> > + if (drm_core_check_feature(dev, DRIVER_MODESET)) {
> > + struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe);
> > +
> > + if (crtc->funcs->get_vblank_counter)
> > + return crtc->funcs->get_vblank_counter(crtc);
> > + }
> > +
> > + if (dev->driver->get_vblank_counter)
> > + return dev->driver->get_vblank_counter(dev, pipe);
> > +
> > + return drm_vblank_no_hw_counter(dev, pipe);
> > +}
> > +
> > +/*
> > + * Reset the stored timestamp for the current vblank count to correspond
> > + * to the last vblank occurred.
> > + *
> > + * Only to be called from drm_crtc_vblank_on().
> > + *
> > + * Note: caller must hold &drm_device.vbl_lock since this reads & writes
> > + * device vblank fields.
> > + */
> > +static void drm_reset_vblank_timestamp(struct drm_device *dev,
> > unsigned int pipe)
> > +{
> > + u32 cur_vblank;
> > + bool rc;
> > + struct timeval t_vblank;
> > + int count = DRM_TIMESTAMP_MAXRETRIES;
> > +
> > + spin_lock(&dev->vblank_time_lock);
> > +
> > + /*
> > + * sample the current counter to avoid random jumps
> > + * when drm_vblank_enable() applies the diff
> > + */
> > + do {
> > + cur_vblank = __get_vblank_counter(dev, pipe);
> > + rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false);
> > + } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
> > +
> > + /*
> > + * Only reinitialize corresponding vblank timestamp if high-precision query
> > + * available and didn't fail. Otherwise reinitialize delayed at next vblank
> > + * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid.
> > + */
> > + if (!rc)
> > + t_vblank = (struct timeval) {0, 0};
> > +
> > + /*
> > + * +1 to make sure user will never see the same
> > + * vblank counter value before and after a modeset
> > + */
> > + store_vblank(dev, pipe, 1, &t_vblank, cur_vblank);
> > +
> > + spin_unlock(&dev->vblank_time_lock);
> > +}
> > +
> > +/*
> > + * Call back into the driver to update the appropriate vblank counter
> > + * (specified by @pipe). Deal with wraparound, if it occurred, and
> > + * update the last read value so we can deal with wraparound on the next
> > + * call if necessary.
> > + *
> > + * Only necessary when going from off->on, to account for frames we
> > + * didn't get an interrupt for.
> > + *
> > + * Note: caller must hold &drm_device.vbl_lock since this reads & writes
> > + * device vblank fields.
> > + */
> > +static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
> > + bool in_vblank_irq)
> > +{
> > + struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
> > + u32 cur_vblank, diff;
> > + bool rc;
> > + struct timeval t_vblank;
> > + int count = DRM_TIMESTAMP_MAXRETRIES;
> > + int framedur_ns = vblank->framedur_ns;
> > +
> > + /*
> > + * Interrupts were disabled prior to this call, so deal with counter
> > + * wrap if needed.
> > + * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events
> > + * here if the register is small or we had vblank interrupts off for
> > + * a long time.
> > + *
> > + * We repeat the hardware vblank counter & timestamp query until
> > + * we get consistent results. This to prevent races between gpu
> > + * updating its hardware counter while we are retrieving the
> > + * corresponding vblank timestamp.
> > + */
> > + do {
> > + cur_vblank = __get_vblank_counter(dev, pipe);
> > + rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq);
> > + } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
> > +
> > + if (dev->max_vblank_count != 0) {
> > + /* trust the hw counter when it's around */
> > + diff = (cur_vblank - vblank->last) & dev->max_vblank_count;
> > + } else if (rc && framedur_ns) {
> > + const struct timeval *t_old;
> > + u64 diff_ns;
> > +
> > + t_old = &vblank->time;
> > + diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old);
> > +
> > + /*
> > + * Figure out how many vblanks we've missed based
> > + * on the difference in the timestamps and the
> > + * frame/field duration.
> > + */
> > + diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);
> > +
> > + if (diff == 0 && in_vblank_irq)
> > + DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored."
> > + " diff_ns = %lld, framedur_ns = %d)\n",
> > + pipe, (long long) diff_ns, framedur_ns);
> > + } else {
> > + /* some kind of default for drivers w/o accurate vbl timestamping */
> > + diff = in_vblank_irq ? 1 : 0;
> > + }
> > +
> > + /*
> > + * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset
> > + * interval? If so then vblank irqs keep running and it will likely
> > + * happen that the hardware vblank counter is not trustworthy as it
> > + * might reset at some point in that interval and vblank timestamps
> > + * are not trustworthy either in that interval. Iow. this can result
> > + * in a bogus diff >> 1 which must be avoided as it would cause
> > + * random large forward jumps of the software vblank counter.
> > + */
> > + if (diff > 1 && (vblank->inmodeset & 0x2)) {
> > + DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u"
> > + " due to pre-modeset.\n", pipe, diff);
> > + diff = 1;
> > + }
> > +
> > + DRM_DEBUG_VBL("updating vblank count on crtc %u:"
> > + " current=%u, diff=%u, hw=%u hw_last=%u\n",
> > + pipe, vblank->count, diff, cur_vblank, vblank->last);
> > +
> > + if (diff == 0) {
> > + WARN_ON_ONCE(cur_vblank != vblank->last);
> > + return;
> > + }
> > +
> > + /*
> > + * Only reinitialize corresponding vblank timestamp if high-precision query
> > + * available and didn't fail, or we were called from the vblank interrupt.
> > + * Otherwise reinitialize delayed at next vblank interrupt and assign 0
> > + * for now, to mark the vblanktimestamp as invalid.
> > + */
> > + if (!rc && in_vblank_irq)
> > + t_vblank = (struct timeval) {0, 0};
> > +
> > + store_vblank(dev, pipe, diff, &t_vblank, cur_vblank);
> > +}
> > +
> > +static 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;
> > +}
> > +
> > +/**
> > + * drm_accurate_vblank_count - retrieve the master vblank counter
> > + * @crtc: which counter to retrieve
> > + *
> > + * This function is similar to @drm_crtc_vblank_count but this
> > + * function interpolates to handle a race with vblank irq's.
> > + *
> > + * This is mostly useful for hardware that can obtain the scanout
> > + * position, but doesn't have a frame counter.
> > + */
> > +u32 drm_accurate_vblank_count(struct drm_crtc *crtc)
> > +{
> > + struct drm_device *dev = crtc->dev;
> > + unsigned int pipe = drm_crtc_index(crtc);
> > + u32 vblank;
> > + unsigned long flags;
> > +
> > + WARN(!dev->driver->get_vblank_timestamp,
> > + "This function requires support for accurate vblank timestamps.");
> > +
> > + spin_lock_irqsave(&dev->vblank_time_lock, flags);
> > +
> > + drm_update_vblank_count(dev, pipe, false);
> > + vblank = drm_vblank_count(dev, pipe);
> > +
> > + spin_unlock_irqrestore(&dev->vblank_time_lock, flags);
> > +
> > + return vblank;
> > +}
> > +EXPORT_SYMBOL(drm_accurate_vblank_count);
> > +
> > +static void __disable_vblank(struct drm_device *dev, unsigned int pipe)
> > +{
> > + if (drm_core_check_feature(dev, DRIVER_MODESET)) {
> > + struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe);
> > +
> > + if (crtc->funcs->disable_vblank) {
> > + crtc->funcs->disable_vblank(crtc);
> > + return;
> > + }
> > + }
> > +
> > + dev->driver->disable_vblank(dev, pipe);
> > +}
> > +
> > +/*
> > + * Disable vblank irq's on crtc, make sure that last vblank count
> > + * of hardware and corresponding consistent software vblank counter
> > + * are preserved, even if there are any spurious vblank irq's after
> > + * disable.
> > + */
> > +void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe)
> > +{
> > + struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
> > + unsigned long irqflags;
> > +
> > + assert_spin_locked(&dev->vbl_lock);
> > +
> > + /* Prevent vblank irq processing while disabling vblank irqs,
> > + * so no updates of timestamps or count can happen after we've
> > + * disabled. Needed to prevent races in case of delayed irq's.
> > + */
> > + spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
> > +
> > + /*
> > + * Only disable vblank interrupts if they're enabled. This avoids
> > + * calling the ->disable_vblank() operation in atomic context with the
> > + * hardware potentially runtime suspended.
> > + */
> > + if (vblank->enabled) {
> > + __disable_vblank(dev, pipe);
> > + vblank->enabled = false;
> > + }
> > +
> > + /*
> > + * Always update the count and timestamp to maintain the
> > + * appearance that the counter has been ticking all along until
> > + * this time. This makes the count account for the entire time
> > + * between drm_crtc_vblank_on() and drm_crtc_vblank_off().
> > + */
> > + drm_update_vblank_count(dev, pipe, false);
> > +
> > + spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
> > +}
> > +
> > +static void vblank_disable_fn(unsigned long arg)
> > +{
> > + struct drm_vblank_crtc *vblank = (void *)arg;
> > + struct drm_device *dev = vblank->dev;
> > + unsigned int pipe = vblank->pipe;
> > + unsigned long irqflags;
> > +
> > + spin_lock_irqsave(&dev->vbl_lock, irqflags);
> > + if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) {
> > + DRM_DEBUG("disabling vblank on crtc %u\n", pipe);
> > + drm_vblank_disable_and_save(dev, pipe);
> > + }
> > + spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
> > +}
> > +
> > +/**
> > + * drm_vblank_cleanup - cleanup vblank support
> > + * @dev: DRM device
> > + *
> > + * This function cleans up any resources allocated in drm_vblank_init.
> > + */
> > +void drm_vblank_cleanup(struct drm_device *dev)
> > +{
> > + unsigned int pipe;
> > +
> > + /* Bail if the driver didn't call drm_vblank_init() */
> > + if (dev->num_crtcs == 0)
> > + return;
> > +
> > + for (pipe = 0; pipe < dev->num_crtcs; pipe++) {
> > + struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
> > +
> > + WARN_ON(READ_ONCE(vblank->enabled) &&
> > + drm_core_check_feature(dev, DRIVER_MODESET));
> > +
> > + del_timer_sync(&vblank->disable_timer);
> > + }
> > +
> > + kfree(dev->vblank);
> > +
> > + dev->num_crtcs = 0;
> > +}
> > +EXPORT_SYMBOL(drm_vblank_cleanup);
> > +
> > +/**
> > + * drm_vblank_init - initialize vblank support
> > + * @dev: DRM device
> > + * @num_crtcs: number of CRTCs supported by @dev
> > + *
> > + * This function initializes vblank support for @num_crtcs display pipelines.
> > + *
> > + * Returns:
> > + * Zero on success or a negative error code on failure.
> > + */
> > +int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
> > +{
> > + int ret = -ENOMEM;
> > + unsigned int i;
> > +
> > + spin_lock_init(&dev->vbl_lock);
> > + spin_lock_init(&dev->vblank_time_lock);
> > +
> > + dev->num_crtcs = num_crtcs;
> > +
> > + dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL);
> > + if (!dev->vblank)
> > + goto err;
> > +
> > + for (i = 0; i < num_crtcs; i++) {
> > + struct drm_vblank_crtc *vblank = &dev->vblank[i];
> > +
> > + vblank->dev = dev;
> > + vblank->pipe = i;
> > + init_waitqueue_head(&vblank->queue);
> > + setup_timer(&vblank->disable_timer, vblank_disable_fn,
> > + (unsigned long)vblank);
> > + seqlock_init(&vblank->seqlock);
> > + }
> > +
> > + DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n");
> > +
> > + /* Driver specific high-precision vblank timestamping supported? */
> > + if (dev->driver->get_vblank_timestamp)
> > + DRM_INFO("Driver supports precise vblank timestamp query.\n");
> > + else
> > + DRM_INFO("No driver support for vblank timestamp query.\n");
> > +
> > + /* Must have precise timestamping for reliable vblank instant disable */
> > + if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) {
> > + dev->vblank_disable_immediate = false;
> > + DRM_INFO("Setting vblank_disable_immediate to false because "
> > + "get_vblank_timestamp == NULL\n");
> > + }
> > +
> > + return 0;
> > +
> > +err:
> > + dev->num_crtcs = 0;
> > + return ret;
> > +}
> > +EXPORT_SYMBOL(drm_vblank_init);
> > +
> > +/**
> > + * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC
> > + * @crtc: which CRTC's vblank waitqueue to retrieve
> > + *
> > + * This function returns a pointer to the vblank waitqueue for the CRTC.
> > + * Drivers can use this to implement vblank waits using wait_event()
> > and related
> > + * functions.
> > + */
> > +wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc)
> > +{
> > + return &crtc->dev->vblank[drm_crtc_index(crtc)].queue;
> > +}
> > +EXPORT_SYMBOL(drm_crtc_vblank_waitqueue);
> > +
> > +
> > +/**
> > + * 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;
> > + vblank->hwmode = *mode;
> > +
> > + 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
> > + * @in_vblank_irq:
> > + * True when called from drm_crtc_handle_vblank(). Some drivers
> > + * need to apply some workarounds for gpu-specific vblank irq quirks
> > + * if flag is set.
> > + *
> > + * 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.
> > + *
> > + * This function can be used to implement the &drm_driver.get_vblank_timestamp
> > + * directly, if the driver implements the
> > &drm_driver.get_scanout_position hook.
> > + *
> > + * Note that atomic drivers must call drm_calc_timestamping_constants() before
> > + * enabling a CRTC. The atomic helpers already take care of that in
> > + * drm_atomic_helper_update_legacy_modeset_state().
> > + *
> > + * Returns:
> > + *
> > + * Returns true on success, and false on failure, i.e. when no accurate
> > + * timestamp could be acquired.
> > + */
> > +bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> > + unsigned int pipe,
> > + int *max_error,
> > + struct timeval *vblank_time,
> > + bool in_vblank_irq)
> > +{
> > + struct timeval tv_etime;
> > + ktime_t stime, etime;
> > + bool vbl_status;
> > + struct drm_crtc *crtc;
> > + const struct drm_display_mode *mode;
> > + struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
> > + int vpos, hpos, i;
> > + int delta_ns, duration_ns;
> > +
> > + if (!drm_core_check_feature(dev, DRIVER_MODESET))
> > + return false;
> > +
> > + crtc = drm_crtc_from_index(dev, pipe);
> > +
> > + if (pipe >= dev->num_crtcs || !crtc) {
> > + DRM_ERROR("Invalid crtc %u\n", pipe);
> > + return false;
> > + }
> > +
> > + /* 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 false;
> > + }
> > +
> > + if (drm_drv_uses_atomic_modeset(dev))
> > + mode = &vblank->hwmode;
> > + else
> > + mode = &crtc->hwmode;
> > +
> > + /* 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);
> > + WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev));
> > +
> > + return false;
> > + }
> > +
> > + /* 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,
> > + in_vblank_irq,
> > + &vpos, &hpos,
> > + &stime, &etime,
> > + mode);
> > +
> > + /* Return as no-op if scanout query unsupported or failed. */
> > + if (!vbl_status) {
> > + DRM_DEBUG("crtc %u : scanoutpos query failed.\n",
> > + pipe);
> > + return false;
> > + }
> > +
> > + /* 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;
> > +
> > + /* 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 p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",
> > + pipe, 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 true;
> > +}
> > +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
> > + * @in_vblank_irq:
> > + * True when called from drm_crtc_handle_vblank(). Some drivers
> > + * need to apply some workarounds for gpu-specific vblank irq quirks
> > + * if flag is set.
> > + *
> > + * 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, bool in_vblank_irq)
> > +{
> > + bool ret = false;
> > +
> > + /* 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, in_vblank_irq);
> > +
> > + /* GPU high precision timestamp query unsupported or failed.
> > + * Return current monotonic/gettimeofday timestamp as best estimate.
> > + */
> > + if (!ret)
> > + *tvblank = get_drm_timestamp();
> > +
> > + return ret;
> > +}
> > +
> > +/**
> > + * 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.
> > + *
> > + * 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)) {
> > + *vblanktime = (struct timeval) { 0 };
> > + 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.file_priv, 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.
> > + *
> > + * NOTE: Drivers using this to send out the &drm_crtc_state.event as part of an
> > + * atomic commit must ensure that the next vblank happens at exactly the same
> > + * time as the atomic commit is committed to the hardware. This function itself
> > + * does **not** protect again the next vblank interrupt racing with either this
> > + * function call or the atomic commit operation. A possible sequence could be:
> > + *
> > + * 1. Driver commits new hardware state into vblank-synchronized registers.
> > + * 2. A vblank happens, committing the hardware state. Also the corresponding
> > + * vblank interrupt is fired off and fully processed by the interrupt
> > + * handler.
> > + * 3. The atomic commit operation proceeds to call drm_crtc_arm_vblank_event().
> > + * 4. The event is only send out for the next vblank, which is wrong.
> > + *
> > + * An equivalent race can happen when the driver calls
> > + * drm_crtc_arm_vblank_event() before writing out the new hardware state.
> > + *
> > + * The only way to make this work safely is to prevent the vblank from firing
> > + * (and the hardware from committing anything else) until the entire atomic
> > + * commit sequence has run to completion. If the hardware does not have such a
> > + * feature (e.g. using a "go" bit), then it is unsafe to use this functions.
> > + * Instead drivers need to manually send out the event from their interrupt
> > + * handler by calling drm_crtc_send_vblank_event() and make sure that
> > there's no
> > + * possible race with the hardware committing the atomic update.
> > + *
> > + * 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);
> > + e->event.crtc_id = crtc->base.id;
> > + 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 for the most recently processed
> > + * vblank, and sends it to userspace. Caller must hold event lock.
> > + *
> > + * See drm_crtc_arm_vblank_event() for a helper which can be used in certain
> > + * situation, especially to send out events for atomic commit operations.
> > + */
> > +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;
> > + e->event.crtc_id = crtc->base.id;
> > + send_vblank_event(dev, e, seq, &now);
> > +}
> > +EXPORT_SYMBOL(drm_crtc_send_vblank_event);
> > +
> > +static int __enable_vblank(struct drm_device *dev, unsigned int pipe)
> > +{
> > + if (drm_core_check_feature(dev, DRIVER_MODESET)) {
> > + struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe);
> > +
> > + if (crtc->funcs->enable_vblank)
> > + return crtc->funcs->enable_vblank(crtc);
> > + }
> > +
> > + return dev->driver->enable_vblank(dev, pipe);
> > +}
> > +
> > +/**
> > + * 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 = __enable_vblank(dev, pipe);
> > + DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret);
> > + if (ret) {
> > + atomic_dec(&vblank->refcount);
> > + } else {
> > + drm_update_vblank_count(dev, pipe, 0);
> > + /* drm_update_vblank_count() includes a wmb so we just
> > + * need to ensure that the compiler emits the write
> > + * to mark the vblank as enabled after the call
> > + * to drm_update_vblank_count().
> > + */
> > + WRITE_ONCE(vblank->enabled, true);
> > + }
> > + }
> > +
> > + 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 (drm_vblank_offdelay < 0)
> > + vblank_disable_fn((unsigned long)vblank);
> > + else if (!dev->vblank_disable_immediate)
> > + 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_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.
> > + */
> > +void drm_crtc_vblank_off(struct drm_crtc *crtc)
> > +{
> > + struct drm_device *dev = crtc->dev;
> > + unsigned int pipe = drm_crtc_index(crtc);
> > + 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_crtc_vblank_on(). */
> > + if (drm_core_check_feature(dev, DRIVER_ATOMIC) || !vblank->inmodeset)
> > + drm_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);
> > +
> > + /* Will be reset by the modeset helpers when re-enabling the crtc by
> > + * calling drm_calc_timestamping_constants(). */
> > + vblank->hwmode.crtc_clock = 0;
> > +}
> > +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_crtc_vblank_on - enable vblank events on a CRTC
> > + * @crtc: CRTC in question
> > + *
> > + * This functions restores the vblank interrupt state captured with
> > + * drm_crtc_vblank_off() again. Note that calls to drm_crtc_vblank_on() and
> > + * drm_crtc_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.
> > + */
> > +void drm_crtc_vblank_on(struct drm_crtc *crtc)
> > +{
> > + struct drm_device *dev = crtc->dev;
> > + unsigned int pipe = drm_crtc_index(crtc);
> > + 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_crtc_vblank_on);
> > +
> > +static void drm_legacy_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;
> > + }
> > +}
> > +
> > +static void drm_legacy_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;
> > + }
> > +}
> > +
> > +int drm_legacy_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_LEGACY))
> > + return 0;
> > +
> > + pipe = modeset->crtc;
> > + if (pipe >= dev->num_crtcs)
> > + return -EINVAL;
> > +
> > + switch (modeset->cmd) {
> > + case _DRM_PRE_MODESET:
> > + drm_legacy_vblank_pre_modeset(dev, pipe);
> > + break;
> > + case _DRM_POST_MODESET:
> > + drm_legacy_vblank_post_modeset(dev, pipe);
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static inline bool vblank_passed(u32 seq, u32 ref)
> > +{
> > + return (seq - ref) <= (1 << 23);
> > +}
> > +
> > +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->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_crtc_vblank_off() might have been called after we called
> > + * drm_vblank_get(). drm_crtc_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 (!READ_ONCE(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(file_priv, pipe,
> > + vblwait->request.sequence);
> > +
> > + e->event.sequence = vblwait->request.sequence;
> > + if (vblank_passed(seq, vblwait->request.sequence)) {
> > + 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;
> > +}
> > +
> > +static bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait)
> > +{
> > + if (vblwait->request.sequence)
> > + return false;
> > +
> > + return _DRM_VBLANK_RELATIVE ==
> > + (vblwait->request.type & (_DRM_VBLANK_TYPES_MASK |
> > + _DRM_VBLANK_EVENT |
> > + _DRM_VBLANK_NEXTONMISS));
> > +}
> > +
> > +/*
> > + * 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];
> > +
> > + /* If the counter is currently enabled and accurate, short-circuit
> > + * queries to return the cached timestamp of the last vblank.
> > + */
> > + if (dev->vblank_disable_immediate &&
> > + drm_wait_vblank_is_query(vblwait) &&
> > + READ_ONCE(vblank->enabled)) {
> > + 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;
> > + return 0;
> > + }
> > +
> > + ret = drm_vblank_get(dev, pipe);
> > + if (ret) {
> > + DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, 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) &&
> > + vblank_passed(seq, vblwait->request.sequence))
> > + 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);
> > + }
> > +
> > + if (vblwait->request.sequence != seq) {
> > + DRM_DEBUG("waiting on vblank count %u, crtc %u\n",
> > + vblwait->request.sequence, pipe);
> > + DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
> > + vblank_passed(drm_vblank_count(dev, pipe),
> > + vblwait->request.sequence) ||
> > + !READ_ONCE(vblank->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("crtc %d returning %u to client\n",
> > + pipe, vblwait->reply.sequence);
> > + } else {
> > + DRM_DEBUG("crtc %d vblank wait interrupted by signal\n", pipe);
> > + }
> > +
> > +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 (!vblank_passed(seq, e->event.sequence))
> > + 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;
> > + bool disable_irq;
> > +
> > + 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, true);
> > +
> > + spin_unlock(&dev->vblank_time_lock);
> > +
> > + wake_up(&vblank->queue);
> > +
> > + /* With instant-off, we defer disabling the interrupt until after
> > + * we finish processing the following vblank after all events have
> > + * been signaled. The disable has to be last (after
> > + * drm_handle_vblank_events) so that the timestamp is always accurate.
> > + */
> > + disable_irq = (dev->vblank_disable_immediate &&
> > + drm_vblank_offdelay > 0 &&
> > + !atomic_read(&vblank->refcount));
> > +
> > + drm_handle_vblank_events(dev, pipe);
> > +
> > + spin_unlock_irqrestore(&dev->event_lock, irqflags);
> > +
> > + if (disable_irq)
> > + vblank_disable_fn((unsigned long)vblank);
> > +
> > + 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);
> > diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> > index c363f2fdff31..2e0b76cceb97 100644
> > --- a/include/drm/drmP.h
> > +++ b/include/drm/drmP.h
> > @@ -80,6 +80,9 @@
> > #include <drm/drm_debugfs.h>
> > #include <drm/drm_ioctl.h>
> > #include <drm/drm_sysfs.h>
> > +#include <drm/drm_vblank.h>
> > +#include <drm/drm_irq.h>
> > +
> >
> > struct module;
> >
> > @@ -447,8 +450,6 @@ static inline bool
> > drm_drv_uses_atomic_modeset(struct drm_device *dev)
> > return dev->mode_config.funcs->atomic_commit != NULL;
> > }
> >
> > -#include <drm/drm_irq.h>
> > -
> > #define DRM_SWITCH_POWER_ON 0
> > #define DRM_SWITCH_POWER_OFF 1
> > #define DRM_SWITCH_POWER_CHANGING 2
> > diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h
> > index 5dd27ae5c47c..d66f7ee07fb5 100644
> > --- a/include/drm/drm_file.h
> > +++ b/include/drm/drm_file.h
> > @@ -40,6 +40,7 @@
> > struct dma_fence;
> > struct drm_file;
> > struct drm_device;
> > +struct device;
> >
> > /*
> > * FIXME: Not sure we want to have drm_minor here in the end, but to avoid
> > diff --git a/include/drm/drm_irq.h b/include/drm/drm_irq.h
> > index 569ca86d4e1f..d77f6e65b1c6 100644
> > --- a/include/drm/drm_irq.h
> > +++ b/include/drm/drm_irq.h
> > @@ -24,165 +24,9 @@
> > #ifndef _DRM_IRQ_H_
> > #define _DRM_IRQ_H_
> >
> > -#include <linux/seqlock.h>
> > -
> > -/**
> > - * struct drm_pending_vblank_event - pending vblank event tracking
> > - */
> > -struct drm_pending_vblank_event {
> > - /**
> > - * @base: Base structure for tracking pending DRM events.
> > - */
> > - struct drm_pending_event base;
> > - /**
> > - * @pipe: drm_crtc_index() of the &drm_crtc this event is for.
> > - */
> > - unsigned int pipe;
> > - /**
> > - * @event: Actual event which will be sent to userspace.
> > - */
> > - struct drm_event_vblank event;
> > -};
> > -
> > -/**
> > - * struct drm_vblank_crtc - vblank tracking for a CRTC
> > - *
> > - * This structure tracks the vblank state for one CRTC.
> > - *
> > - * Note that for historical reasons - the vblank handling code is still shared
> > - * with legacy/non-kms drivers - this is a free-standing structure not directly
> > - * connected to &struct drm_crtc. But all public interface functions are taking
> > - * a &struct drm_crtc to hide this implementation detail.
> > - */
> > -struct drm_vblank_crtc {
> > - /**
> > - * @dev: Pointer to the &drm_device.
> > - */
> > - struct drm_device *dev;
> > - /**
> > - * @queue: Wait queue for vblank waiters.
> > - */
> > - wait_queue_head_t queue; /**< VBLANK wait queue */
> > - /**
> > - * @disable_timer: Disable timer for the delayed vblank disabling
> > - * hysteresis logic. Vblank disabling is controlled through the
> > - * drm_vblank_offdelay module option and the setting of the
> > - * &drm_device.max_vblank_count value.
> > - */
> > - struct timer_list disable_timer;
> > -
> > - /**
> > - * @seqlock: Protect vblank count and time.
> > - */
> > - seqlock_t seqlock; /* protects vblank count and time */
> > -
> > - /**
> > - * @count: Current software vblank counter.
> > - */
> > - u32 count;
> > - /**
> > - * @time: Vblank timestamp corresponding to @count.
> > - */
> > - struct timeval time;
> > -
> > - /**
> > - * @refcount: Number of users/waiters of the vblank interrupt. Only when
> > - * this refcount reaches 0 can the hardware interrupt be disabled using
> > - * @disable_timer.
> > - */
> > - atomic_t refcount; /* number of users of vblank interruptsper crtc */
> > - /**
> > - * @last: Protected by &drm_device.vbl_lock, used for wraparound handling.
> > - */
> > - u32 last;
> > - /**
> > - * @inmodeset: Tracks whether the vblank is disabled due to a modeset.
> > - * For legacy driver bit 2 additionally tracks whether an additional
> > - * temporary vblank reference has been acquired to paper over the
> > - * hardware counter resetting/jumping. KMS drivers should instead just
> > - * call drm_crtc_vblank_off() and drm_crtc_vblank_on(), which explicitly
> > - * save and restore the vblank count.
> > - */
> > - unsigned int inmodeset; /* Display driver is setting mode */
> > - /**
> > - * @pipe: drm_crtc_index() of the &drm_crtc corresponding to this
> > - * structure.
> > - */
> > - unsigned int pipe;
> > - /**
> > - * @framedur_ns: Frame/Field duration in ns, used by
> > - * drm_calc_vbltimestamp_from_scanoutpos() and computed by
> > - * drm_calc_timestamping_constants().
> > - */
> > - int framedur_ns;
> > - /**
> > - * @linedur_ns: Line duration in ns, used by
> > - * drm_calc_vbltimestamp_from_scanoutpos() and computed by
> > - * drm_calc_timestamping_constants().
> > - */
> > - int linedur_ns;
> > -
> > - /**
> > - * @hwmode:
> > - *
> > - * Cache of the current hardware display mode. Only valid when @enabled
> > - * is set. This is used by helpers like
> > - * drm_calc_vbltimestamp_from_scanoutpos(). We can't just access the
> > - * hardware mode by e.g. looking at &drm_crtc_state.adjusted_mode,
> > - * because that one is really hard to get from interrupt context.
> > - */
> > - struct drm_display_mode hwmode;
> > -
> > - /**
> > - * @enabled: Tracks the enabling state of the corresponding &drm_crtc to
> > - * avoid double-disabling and hence corrupting saved state. Needed by
> > - * drivers not using atomic KMS, since those might go through their CRTC
> > - * disabling functions multiple times.
> > - */
> > - bool enabled;
> > -};
> > +struct drm_device;
> >
> > int drm_irq_install(struct drm_device *dev, int irq);
> > int drm_irq_uninstall(struct drm_device *dev);
> >
> > -int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
> > -u32 drm_crtc_vblank_count(struct drm_crtc *crtc);
> > -u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
> > - struct timeval *vblanktime);
> > -void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
> > - struct drm_pending_vblank_event *e);
> > -void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
> > - struct drm_pending_vblank_event *e);
> > -bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe);
> > -bool drm_crtc_handle_vblank(struct drm_crtc *crtc);
> > -int drm_crtc_vblank_get(struct drm_crtc *crtc);
> > -void drm_crtc_vblank_put(struct drm_crtc *crtc);
> > -void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe);
> > -void drm_crtc_wait_one_vblank(struct drm_crtc *crtc);
> > -void drm_crtc_vblank_off(struct drm_crtc *crtc);
> > -void drm_crtc_vblank_reset(struct drm_crtc *crtc);
> > -void drm_crtc_vblank_on(struct drm_crtc *crtc);
> > -void drm_vblank_cleanup(struct drm_device *dev);
> > -u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
> > -
> > -bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> > - unsigned int pipe, int *max_error,
> > - struct timeval *vblank_time,
> > - bool in_vblank_irq);
> > -void drm_calc_timestamping_constants(struct drm_crtc *crtc,
> > - const struct drm_display_mode *mode);
> > -
> > -/**
> > - * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC
> > - * @crtc: which CRTC's vblank waitqueue to retrieve
> > - *
> > - * This function returns a pointer to the vblank waitqueue for the CRTC.
> > - * Drivers can use this to implement vblank waits using wait_event()
> > and related
> > - * functions.
> > - */
> > -static inline wait_queue_head_t *drm_crtc_vblank_waitqueue(struct
> > drm_crtc *crtc)
> > -{
> > - return &crtc->dev->vblank[drm_crtc_index(crtc)].queue;
> > -}
> > -
> > #endif
> > diff --git a/include/drm/drm_prime.h b/include/drm/drm_prime.h
> > index 59ccab402e85..9cd9e36f77b5 100644
> > --- a/include/drm/drm_prime.h
> > +++ b/include/drm/drm_prime.h
> > @@ -59,6 +59,8 @@ struct drm_device;
> > struct drm_gem_object;
> > struct drm_file;
> >
> > +struct device;
> > +
> > struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
> > struct drm_gem_object *obj,
> > int flags);
> > diff --git a/include/drm/drm_vblank.h b/include/drm/drm_vblank.h
> > new file mode 100644
> > index 000000000000..4cde47332dfa
> > --- /dev/null
> > +++ b/include/drm/drm_vblank.h
> > @@ -0,0 +1,181 @@
> > +/*
> > + * Copyright 2016 Intel Corp.
> > + *
> > + * Permission is hereby granted, free of charge, to any person obtaining a
> > + * copy of this software and associated documentation files (the "Software"),
> > + * to deal in the Software without restriction, including without limitation
> > + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> > + * and/or sell copies of the Software, and to permit persons to whom the
> > + * Software is furnished to do so, subject to the following conditions:
> > + *
> > + * The above copyright notice and this permission notice (including the next
> > + * paragraph) shall be included in all copies or substantial portions of the
> > + * Software.
> > + *
> > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> > + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> > + * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
> > + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> > + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> > + * OTHER DEALINGS IN THE SOFTWARE.
> > + */
> > +
> > +#ifndef _DRM_VBLANK_H_
> > +#define _DRM_VBLANK_H_
> > +
> > +#include <linux/seqlock.h>
> > +#include <linux/idr.h>
> > +#include <linux/poll.h>
> > +
> > +#include <drm/drm_file.h>
> > +#include <drm/drm_modes.h>
> > +#include <uapi/drm/drm.h>
> > +
> > +struct drm_device;
> > +struct drm_crtc;
> > +
> > +/**
> > + * struct drm_pending_vblank_event - pending vblank event tracking
> > + */
> > +struct drm_pending_vblank_event {
> > + /**
> > + * @base: Base structure for tracking pending DRM events.
> > + */
> > + struct drm_pending_event base;
> > + /**
> > + * @pipe: drm_crtc_index() of the &drm_crtc this event is for.
> > + */
> > + unsigned int pipe;
> > + /**
> > + * @event: Actual event which will be sent to userspace.
> > + */
> > + struct drm_event_vblank event;
> > +};
> > +
> > +/**
> > + * struct drm_vblank_crtc - vblank tracking for a CRTC
> > + *
> > + * This structure tracks the vblank state for one CRTC.
> > + *
> > + * Note that for historical reasons - the vblank handling code is still shared
> > + * with legacy/non-kms drivers - this is a free-standing structure not directly
> > + * connected to &struct drm_crtc. But all public interface functions are taking
> > + * a &struct drm_crtc to hide this implementation detail.
> > + */
> > +struct drm_vblank_crtc {
> > + /**
> > + * @dev: Pointer to the &drm_device.
> > + */
> > + struct drm_device *dev;
> > + /**
> > + * @queue: Wait queue for vblank waiters.
> > + */
> > + wait_queue_head_t queue; /**< VBLANK wait queue */
> > + /**
> > + * @disable_timer: Disable timer for the delayed vblank disabling
> > + * hysteresis logic. Vblank disabling is controlled through the
> > + * drm_vblank_offdelay module option and the setting of the
> > + * &drm_device.max_vblank_count value.
> > + */
> > + struct timer_list disable_timer;
> > +
> > + /**
> > + * @seqlock: Protect vblank count and time.
> > + */
> > + seqlock_t seqlock; /* protects vblank count and time */
> > +
> > + /**
> > + * @count: Current software vblank counter.
> > + */
> > + u32 count;
> > + /**
> > + * @time: Vblank timestamp corresponding to @count.
> > + */
> > + struct timeval time;
> > +
> > + /**
> > + * @refcount: Number of users/waiters of the vblank interrupt. Only when
> > + * this refcount reaches 0 can the hardware interrupt be disabled using
> > + * @disable_timer.
> > + */
> > + atomic_t refcount; /* number of users of vblank interruptsper crtc */
> > + /**
> > + * @last: Protected by &drm_device.vbl_lock, used for wraparound handling.
> > + */
> > + u32 last;
> > + /**
> > + * @inmodeset: Tracks whether the vblank is disabled due to a modeset.
> > + * For legacy driver bit 2 additionally tracks whether an additional
> > + * temporary vblank reference has been acquired to paper over the
> > + * hardware counter resetting/jumping. KMS drivers should instead just
> > + * call drm_crtc_vblank_off() and drm_crtc_vblank_on(), which explicitly
> > + * save and restore the vblank count.
> > + */
> > + unsigned int inmodeset; /* Display driver is setting mode */
> > + /**
> > + * @pipe: drm_crtc_index() of the &drm_crtc corresponding to this
> > + * structure.
> > + */
> > + unsigned int pipe;
> > + /**
> > + * @framedur_ns: Frame/Field duration in ns, used by
> > + * drm_calc_vbltimestamp_from_scanoutpos() and computed by
> > + * drm_calc_timestamping_constants().
> > + */
> > + int framedur_ns;
> > + /**
> > + * @linedur_ns: Line duration in ns, used by
> > + * drm_calc_vbltimestamp_from_scanoutpos() and computed by
> > + * drm_calc_timestamping_constants().
> > + */
> > + int linedur_ns;
> > +
> > + /**
> > + * @hwmode:
> > + *
> > + * Cache of the current hardware display mode. Only valid when @enabled
> > + * is set. This is used by helpers like
> > + * drm_calc_vbltimestamp_from_scanoutpos(). We can't just access the
> > + * hardware mode by e.g. looking at &drm_crtc_state.adjusted_mode,
> > + * because that one is really hard to get from interrupt context.
> > + */
> > + struct drm_display_mode hwmode;
> > +
> > + /**
> > + * @enabled: Tracks the enabling state of the corresponding &drm_crtc to
> > + * avoid double-disabling and hence corrupting saved state. Needed by
> > + * drivers not using atomic KMS, since those might go through their CRTC
> > + * disabling functions multiple times.
> > + */
> > + bool enabled;
> > +};
> > +
> > +int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
> > +u32 drm_crtc_vblank_count(struct drm_crtc *crtc);
> > +u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
> > + struct timeval *vblanktime);
> > +void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
> > + struct drm_pending_vblank_event *e);
> > +void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
> > + struct drm_pending_vblank_event *e);
> > +bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe);
> > +bool drm_crtc_handle_vblank(struct drm_crtc *crtc);
> > +int drm_crtc_vblank_get(struct drm_crtc *crtc);
> > +void drm_crtc_vblank_put(struct drm_crtc *crtc);
> > +void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe);
> > +void drm_crtc_wait_one_vblank(struct drm_crtc *crtc);
> > +void drm_crtc_vblank_off(struct drm_crtc *crtc);
> > +void drm_crtc_vblank_reset(struct drm_crtc *crtc);
> > +void drm_crtc_vblank_on(struct drm_crtc *crtc);
> > +void drm_vblank_cleanup(struct drm_device *dev);
> > +u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
> > +
> > +bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> > + unsigned int pipe, int *max_error,
> > + struct timeval *vblank_time,
> > + bool in_vblank_irq);
> > +void drm_calc_timestamping_constants(struct drm_crtc *crtc,
> > + const struct drm_display_mode *mode);
> > +wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc);
> > +#endif
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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