From: Daniel Vetter <daniel@ffwll.ch>
To: Gustavo Padovan <gustavo@padovan.org>
Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
"Daniel Stone" <daniels@collabora.com>,
"Arve Hjønnevåg" <arve@android.com>,
"Riley Andrews" <riandrews@android.com>,
"Daniel Vetter" <daniel.vetter@ffwll.ch>,
"Rob Clark" <robdclark@gmail.com>,
"Greg Hackmann" <ghackmann@google.com>,
"John Harrison" <John.C.Harrison@Intel.com>,
laurent.pinchart@ideasonboard.com, seanpaul@google.com,
marcheu@google.com, m.chehab@samsung.com,
"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
"Gustavo Padovan" <gustavo.padovan@collabora.co.uk>
Subject: Re: [RFC 5/8] drm/fence: add fence to drm_pending_event
Date: Fri, 15 Apr 2016 10:09:48 +0200 [thread overview]
Message-ID: <20160415080948.GS2510@phenom.ffwll.local> (raw)
In-Reply-To: <1460683781-22535-6-git-send-email-gustavo@padovan.org>
On Thu, Apr 14, 2016 at 06:29:38PM -0700, Gustavo Padovan wrote:
> From: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
>
> Now a drm_pending_event can either send a real drm_event or signal a
> fence, or both. It allow us to signal via fences when the buffer is
> displayed on the screen. Which in turn means that the previous buffer
> is not in use anymore and can be freed or sent back to another driver
> for processing.
>
> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Do you have atomic igt testcase that exercise all the combinations of
drm_event and in/out-fences and make sure it all keeps working? Tomeu
already converted that over to be a generic testcase.
> ---
> drivers/gpu/drm/drm_atomic.c | 19 +++++++++++++------
> drivers/gpu/drm/drm_fops.c | 5 +++--
> drivers/gpu/drm/drm_irq.c | 7 +++++++
> include/drm/drmP.h | 1 +
> 4 files changed, 24 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 6702502..0b95526 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -1431,7 +1431,8 @@ EXPORT_SYMBOL(drm_atomic_async_commit);
> */
>
> static struct drm_pending_vblank_event *create_vblank_event(
> - struct drm_device *dev, struct drm_file *file_priv, uint64_t user_data)
> + struct drm_device *dev, struct drm_file *file_priv,
> + struct fence *fence, uint64_t user_data)
> {
> struct drm_pending_vblank_event *e = NULL;
> int ret;
> @@ -1444,12 +1445,17 @@ static struct drm_pending_vblank_event *create_vblank_event(
> e->event.base.length = sizeof(e->event);
> e->event.user_data = user_data;
>
> - ret = drm_event_reserve_init(dev, file_priv, &e->base, &e->event.base);
> - if (ret) {
> - kfree(e);
> - return NULL;
> + if (file_priv) {
> + ret = drm_event_reserve_init(dev, file_priv, &e->base,
> + &e->event.base);
> + if (ret) {
> + kfree(e);
> + return NULL;
> + }
> }
>
> + e->base.fence = fence;
> +
> return e;
> }
>
> @@ -1676,7 +1682,8 @@ retry:
> for_each_crtc_in_state(state, crtc, crtc_state, i) {
> struct drm_pending_vblank_event *e;
>
> - e = create_vblank_event(dev, file_priv, arg->user_data);
> + e = create_vblank_event(dev, file_priv, NULL,
> + arg->user_data);
> if (!e) {
> ret = -ENOMEM;
> goto out;
> diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
> index aeef58e..38def49 100644
> --- a/drivers/gpu/drm/drm_fops.c
> +++ b/drivers/gpu/drm/drm_fops.c
> @@ -801,8 +801,9 @@ void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e)
> {
> assert_spin_locked(&dev->event_lock);
>
> - if (!e->file_priv) {
> - e->destroy(e);
> + if (!e->file_priv || !e->event) {
This would be a bug: e->file_priv != NULL iff e->event != NULL. How did
this happen?
> + if (e->destroy)
> + e->destroy(e);
> return;
> }
>
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index 3c1a6f1..0c5d7cb 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -41,6 +41,7 @@
>
> #include <linux/vgaarb.h>
> #include <linux/export.h>
> +#include <linux/fence.h>
>
> /* Access macro for slots in vblank timestamp ringbuffer. */
> #define vblanktimestamp(dev, pipe, count) \
> @@ -1124,6 +1125,12 @@ void drm_send_vblank_event(struct drm_device *dev, unsigned int pipe,
> now = get_drm_timestamp();
> }
> e->pipe = pipe;
> +
> + if (e->base.fence) {
> + fence_signal(e->base.fence);
> + fence_put(e->base.fence);
> + }
I'd put this into drm_send_event_locked even. In case we send out fences
for other events too (e.g. exynos uses drm_event for rendering ...).
-Daniel
> +
> send_vblank_event(dev, e, seq, &now);
> }
> EXPORT_SYMBOL(drm_send_vblank_event);
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 3c8422c..8f83c2a 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -282,6 +282,7 @@ struct drm_ioctl_desc {
> /* Event queued up for userspace to read */
> struct drm_pending_event {
> struct drm_event *event;
> + struct fence *fence;
> struct list_head link;
> struct list_head pending_link;
> struct drm_file *file_priv;
> --
> 2.5.5
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
next prev parent reply other threads:[~2016-04-15 8:09 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-15 1:29 [RFC 0/8] drm: explicit fencing support Gustavo Padovan
2016-04-15 1:29 ` [RFC 1/8] dma-buf/fence: add fence_collection fences Gustavo Padovan
2016-04-15 8:02 ` Daniel Vetter
2016-04-15 9:03 ` Christian König
2016-04-15 11:44 ` Daniel Vetter
2016-04-15 18:29 ` Gustavo Padovan
2016-04-15 19:23 ` Daniel Vetter
2016-04-15 18:27 ` Gustavo Padovan
2016-04-15 19:25 ` Daniel Vetter
2016-05-18 7:07 ` Christian König
2016-05-18 14:30 ` Gustavo Padovan
2016-04-15 1:29 ` [RFC 2/8] dma-buf/sync_file: add sync_file_fences_get() Gustavo Padovan
2016-04-15 7:56 ` Daniel Vetter
2016-04-15 1:29 ` [RFC 3/8] drm/fence: allow fence waiting to be interrupted by userspace Gustavo Padovan
2016-04-15 7:47 ` Daniel Vetter
2016-04-15 1:29 ` [RFC 4/8] drm/fence: add in-fences support Gustavo Padovan
2016-04-15 8:05 ` Daniel Vetter
2016-04-15 18:40 ` Gustavo Padovan
2016-04-15 8:11 ` Daniel Vetter
2016-04-15 1:29 ` [RFC 5/8] drm/fence: add fence to drm_pending_event Gustavo Padovan
2016-04-15 8:09 ` Daniel Vetter [this message]
2016-04-15 18:59 ` Gustavo Padovan
2016-04-15 19:31 ` Daniel Vetter
2016-04-15 1:29 ` [RFC 6/8] drm/fence: create DRM_MODE_ATOMIC_OUT_FENCE flag Gustavo Padovan
2016-04-15 1:40 ` Rob Clark
2016-04-15 19:05 ` Gustavo Padovan
2016-04-15 1:29 ` [RFC 7/8] drm/fence: create per-crtc sync_timeline Gustavo Padovan
2016-04-15 1:29 ` [RFC 8/8] drm/fence: add out-fences support Gustavo Padovan
2016-04-15 8:18 ` Daniel Vetter
2016-04-15 19:15 ` Gustavo Padovan
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