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Message-ID: <20170802090545.3r5kukes7xgrazsc@phenom.ffwll.local>
Date: Wed, 2 Aug 2017 11:05:45 +0200
From: Daniel Vetter <daniel@...ll.ch>
To: Keith Packard <keithp@...thp.com>
Cc: linux-kernel@...r.kernel.org, Dave Airlie <airlied@...hat.com>,
Daniel Vetter <daniel@...ll.ch>,
dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 2/3] drm: Reorganize drm_pending_event to support future
event types [v2]
On Mon, Jul 31, 2017 at 10:03:05PM -0700, Keith Packard wrote:
> Place drm_event_vblank in a new union that includes that and a bare
> drm_event structure. This will allow new members of that union to be
> added in the future without changing code related to the existing vbl
> event type.
>
> Assignments to the crtc_id field are now done when the event is
> allocated, rather than when delievered. This way, delivery doesn't
> need to have the crtc ID available.
>
> v2:
> * Remove 'dev' argument from create_vblank_event
>
> It wasn't being used anyways, and if we need it in the future,
> we can always get it from crtc->dev.
>
> * Check for MODESETTING before looking for crtc in queue_vblank_event
>
> UMS drivers will oops if we try to get a crtc, so make sure
> we're modesetting before we try to find a crtc_id to fill into
> the event.
>
> Signed-off-by: Keith Packard <keithp@...thp.com>
> ---
> drivers/gpu/drm/drm_atomic.c | 7 ++++---
> drivers/gpu/drm/drm_plane.c | 2 +-
> drivers/gpu/drm/drm_vblank.c | 30 ++++++++++++++++++------------
> drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c | 4 ++--
> drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c | 4 ++--
> include/drm/drm_vblank.h | 8 +++++++-
> 6 files changed, 34 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index c0f336d23f9c..272b83ea9369 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -1839,7 +1839,7 @@ int drm_atomic_debugfs_init(struct drm_minor *minor)
> */
>
> static struct drm_pending_vblank_event *create_vblank_event(
> - struct drm_device *dev, uint64_t user_data)
> + struct drm_crtc *crtc, uint64_t user_data)
> {
> struct drm_pending_vblank_event *e = NULL;
>
> @@ -1849,7 +1849,8 @@ static struct drm_pending_vblank_event *create_vblank_event(
>
> e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
> e->event.base.length = sizeof(e->event);
> - e->event.user_data = user_data;
> + e->event.vbl.crtc_id = crtc->base.id;
> + e->event.vbl.user_data = user_data;
>
> return e;
> }
> @@ -2052,7 +2053,7 @@ static int prepare_crtc_signaling(struct drm_device *dev,
> if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
> struct drm_pending_vblank_event *e;
>
> - e = create_vblank_event(dev, arg->user_data);
> + e = create_vblank_event(crtc, arg->user_data);
> if (!e)
> return -ENOMEM;
>
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index 5dc8c4350602..fe9f31285bc2 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -918,7 +918,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
> }
> e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
> e->event.base.length = sizeof(e->event);
> - e->event.user_data = page_flip->user_data;
You missed assigning crtc_id here. With that fixes:
Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
Might also be good to check igt coverage for the various corner-cases
here.
> + e->event.vbl.user_data = page_flip->user_data;
> ret = drm_event_reserve_init(dev, file_priv, &e->base, &e->event.base);
> if (ret) {
> kfree(e);
> diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
> index 346601ad698d..7e7119a5ada3 100644
> --- a/drivers/gpu/drm/drm_vblank.c
> +++ b/drivers/gpu/drm/drm_vblank.c
> @@ -804,14 +804,16 @@ static void send_vblank_event(struct drm_device *dev,
> {
> struct timeval tv;
>
> - tv = ktime_to_timeval(now);
> - e->event.sequence = seq;
> - e->event.tv_sec = tv.tv_sec;
> - e->event.tv_usec = tv.tv_usec;
> -
> - trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe,
> - e->event.sequence);
> -
> + switch (e->event.base.type) {
> + case DRM_EVENT_VBLANK:
> + case DRM_EVENT_FLIP_COMPLETE:
> + tv = ktime_to_timeval(now);
> + e->event.vbl.sequence = seq;
> + e->event.vbl.tv_sec = tv.tv_sec;
> + e->event.vbl.tv_usec = tv.tv_usec;
> + break;
> + }
> + trace_drm_vblank_event_delivered(e->base.file_priv, e->pipe, seq);
> drm_send_event_locked(dev, &e->base);
> }
>
> @@ -863,7 +865,6 @@ void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
>
> e->pipe = pipe;
> e->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);
> @@ -894,7 +895,6 @@ void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
> 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);
> @@ -1354,8 +1354,14 @@ static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe,
>
> e->pipe = pipe;
> e->event.base.type = DRM_EVENT_VBLANK;
> - e->event.base.length = sizeof(e->event);
> - e->event.user_data = vblwait->request.signal;
> + e->event.base.length = sizeof(e->event.vbl);
> + e->event.vbl.user_data = vblwait->request.signal;
> + e->event.vbl.crtc_id = 0;
> + if (drm_core_check_feature(dev, DRIVER_MODESET)) {
> + struct drm_crtc *crtc = drm_crtc_from_index(dev, pipe);
> + if (crtc)
> + e->event.vbl.crtc_id = crtc->base.id;
> + }
>
> spin_lock_irqsave(&dev->event_lock, flags);
>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
> index 8d7dc9def7c2..c13b97338310 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
> @@ -358,8 +358,8 @@ static int vmw_sou_crtc_page_flip(struct drm_crtc *crtc,
>
> ret = vmw_event_fence_action_queue(file_priv, fence,
> &event->base,
> - &event->event.tv_sec,
> - &event->event.tv_usec,
> + &event->event.vbl.tv_sec,
> + &event->event.vbl.tv_usec,
> true);
> }
>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c b/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
> index bad31bdf09b6..4e329588ce9c 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
> @@ -544,8 +544,8 @@ static int vmw_stdu_crtc_page_flip(struct drm_crtc *crtc,
>
> ret = vmw_event_fence_action_queue(file_priv, fence,
> &event->base,
> - &event->event.tv_sec,
> - &event->event.tv_usec,
> + &event->event.vbl.tv_sec,
> + &event->event.vbl.tv_usec,
> true);
> vmw_fence_obj_unreference(&fence);
> } else {
> diff --git a/include/drm/drm_vblank.h b/include/drm/drm_vblank.h
> index e809ab244919..3013c55aec1d 100644
> --- a/include/drm/drm_vblank.h
> +++ b/include/drm/drm_vblank.h
> @@ -54,7 +54,10 @@ struct drm_pending_vblank_event {
> /**
> * @event: Actual event which will be sent to userspace.
> */
> - struct drm_event_vblank event;
> + union {
> + struct drm_event base;
> + struct drm_event_vblank vbl;
> + } event;
> };
>
> /**
> @@ -163,6 +166,9 @@ 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);
> +void drm_vblank_set_event(struct drm_pending_vblank_event *e,
> + u64 *seq,
> + ktime_t *now);
> 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);
> --
> 2.13.3
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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