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drm: writeback: Add out-fences for writeback connectors

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Add the WRITEBACK_OUT_FENCE_PTR property to writeback connectors, to
enable userspace to get a fence which will signal once the writeback is
complete. It is not allowed to request an out-fence without a
framebuffer attached to the connector.

A timeline is added to drm_writeback_connector for use by the writeback
out-fences.

In the case of a commit failure or DRM_MODE_ATOMIC_TEST_ONLY, the fence
is set to -1.

Changes from v2:
 - Rebase onto Gustavo Padovan's v9 explicit sync series
 - Change out_fence_ptr type to s32 __user *
 - Set *out_fence_ptr to -1 in drm_atomic_connector_set_property
 - Store fence in drm_writeback_job
 Gustavo Padovan:
 - Move out_fence_ptr out of connector_state
 - Signal fence from drm_writeback_signal_completion instead of
   in driver directly

Changes from v3:
 - Rebase onto commit 7e9081c5aa ("drm/fence: fix memory overwrite
   when setting out_fence fd") (change out_fence_ptr to s32 __user *,
   for real this time.)
 - Update documentation around WRITEBACK_OUT_FENCE_PTR

Signed-off-by: Brian Starkey <brian.starkey@arm.com>
[rebased and fixed conflicts]
Signed-off-by: Mihail Atanassov <mihail.atanassov@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/229036/
This commit is contained in:
Brian Starkey
2017-03-29 17:42:33 +01:00
committed by Liviu Dudau
parent 935774cd71
commit b13cc8dd58
6 changed files with 257 additions and 16 deletions
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8
include/drm/drm_connector.h
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@@ -441,10 +441,10 @@ struct drm_connector_state {
/**
* @writeback_job: Writeback job for writeback connectors
*
* Holds the framebuffer for a writeback connector. As the writeback
* completion may be asynchronous to the normal commit cycle, the
* writeback job lifetime is managed separately from the normal atomic
* state by this object.
* Holds the framebuffer and out-fence for a writeback connector. As
* the writeback completion may be asynchronous to the normal commit
* cycle, the writeback job lifetime is managed separately from the
* normal atomic state by this object.
*
* See also: drm_writeback_queue_job() and
* drm_writeback_signal_completion()