163 lines
3.9 KiB
C
163 lines
3.9 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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* @connector:
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*
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* Back-pointer to the writeback connector associated with the job
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*/
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struct drm_writeback_connector *connector;
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/**
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* @prepared:
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*
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* Set when the job has been prepared with drm_writeback_prepare_job()
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*/
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bool prepared;
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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_writeback_set_fb()
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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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* @priv:
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*
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* Driver-private data
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*/
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void *priv;
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};
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static inline struct drm_writeback_connector *
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drm_connector_to_writeback(struct drm_connector *connector)
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{
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return container_of(connector, struct drm_writeback_connector, base);
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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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int drm_writeback_set_fb(struct drm_connector_state *conn_state,
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struct drm_framebuffer *fb);
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int drm_writeback_prepare_job(struct drm_writeback_job *job);
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void drm_writeback_queue_job(struct drm_writeback_connector *wb_connector,
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struct drm_connector_state *conn_state);
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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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