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b13cc8dd58
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/
131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* (C) COPYRIGHT 2016 ARM Limited. All rights reserved.
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* Author: Brian Starkey <brian.starkey@arm.com>
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms
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* of such GNU licence.
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*/
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#ifndef __DRM_WRITEBACK_H__
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#define __DRM_WRITEBACK_H__
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#include <drm/drm_connector.h>
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#include <drm/drm_encoder.h>
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#include <linux/workqueue.h>
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struct drm_writeback_connector {
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struct drm_connector base;
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/**
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* @encoder: Internal encoder used by the connector to fulfill
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* the DRM framework requirements. The users of the
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* @drm_writeback_connector control the behaviour of the @encoder
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* by passing the @enc_funcs parameter to drm_writeback_connector_init()
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* function.
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*/
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struct drm_encoder encoder;
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/**
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* @pixel_formats_blob_ptr:
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*
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* DRM blob property data for the pixel formats list on writeback
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* connectors
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* See also drm_writeback_connector_init()
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*/
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struct drm_property_blob *pixel_formats_blob_ptr;
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/** @job_lock: Protects job_queue */
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spinlock_t job_lock;
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/**
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* @job_queue:
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*
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* Holds a list of a connector's writeback jobs; the last item is the
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* most recent. The first item may be either waiting for the hardware
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* to begin writing, or currently being written.
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*
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* See also: drm_writeback_queue_job() and
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* drm_writeback_signal_completion()
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*/
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struct list_head job_queue;
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/**
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* @fence_context:
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*
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* timeline context used for fence operations.
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*/
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unsigned int fence_context;
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/**
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* @fence_lock:
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*
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* spinlock to protect the fences in the fence_context.
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*/
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spinlock_t fence_lock;
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/**
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* @fence_seqno:
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*
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* Seqno variable used as monotonic counter for the fences
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* created on the connector's timeline.
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*/
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unsigned long fence_seqno;
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/**
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* @timeline_name:
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*
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* The name of the connector's fence timeline.
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*/
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char timeline_name[32];
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};
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struct drm_writeback_job {
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/**
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* @cleanup_work:
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*
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* Used to allow drm_writeback_signal_completion to defer dropping the
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* framebuffer reference to a workqueue
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*/
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struct work_struct cleanup_work;
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/**
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* @list_entry:
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*
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* List item for the writeback connector's @job_queue
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*/
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struct list_head list_entry;
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/**
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* @fb:
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*
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* Framebuffer to be written to by the writeback connector. Do not set
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* directly, use drm_atomic_set_writeback_fb_for_connector()
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*/
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struct drm_framebuffer *fb;
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/**
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* @out_fence:
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*
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* Fence which will signal once the writeback has completed
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*/
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struct dma_fence *out_fence;
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};
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int drm_writeback_connector_init(struct drm_device *dev,
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struct drm_writeback_connector *wb_connector,
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const struct drm_connector_funcs *con_funcs,
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const struct drm_encoder_helper_funcs *enc_helper_funcs,
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const u32 *formats, int n_formats);
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void drm_writeback_queue_job(struct drm_writeback_connector *wb_connector,
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struct drm_writeback_job *job);
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void drm_writeback_cleanup_job(struct drm_writeback_job *job);
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void
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drm_writeback_signal_completion(struct drm_writeback_connector *wb_connector,
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int status);
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struct dma_fence *
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drm_writeback_get_out_fence(struct drm_writeback_connector *wb_connector);
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#endif
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