include/drm/drm_writeback.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * (C) COPYRIGHT 2016 ARM Limited. All rights reserved.
   4  * Author: Brian Starkey <brian.starkey@arm.com>
   5  *
   6  * This program is free software and is provided to you under the terms of the
   7  * GNU General Public License version 2 as published by the Free Software
   8  * Foundation, and any use by you of this program is subject to the terms
   9  * of such GNU licence.
  10  */
  11
  12 #ifndef __DRM_WRITEBACK_H__
  13 #define __DRM_WRITEBACK_H__
  14 #include <drm/drm_connector.h>
  15 #include <drm/drm_encoder.h>
  16 #include <linux/workqueue.h>
  17
  18 /**
  19  * struct drm_writeback_connector - DRM writeback connector
  20  */
  21 struct drm_writeback_connector {
  22         /**
  23          * @base: base drm_connector object
  24          */
  25         struct drm_connector base;
  26
  27         /**
  28          * @encoder: Internal encoder used by the connector to fulfill
  29          * the DRM framework requirements. The users of the
  30          * @drm_writeback_connector control the behaviour of the @encoder
  31          * by passing the @enc_funcs parameter to drm_writeback_connector_init()
  32          * function.
  33          */
  34         struct drm_encoder encoder;
  35
  36         /**
  37          * @pixel_formats_blob_ptr:
  38          *
  39          * DRM blob property data for the pixel formats list on writeback
  40          * connectors
  41          * See also drm_writeback_connector_init()
  42          */
  43         struct drm_property_blob *pixel_formats_blob_ptr;
  44
  45         /** @job_lock: Protects job_queue */
  46         spinlock_t job_lock;
  47
  48         /**
  49          * @job_queue:
  50          *
  51          * Holds a list of a connector's writeback jobs; the last item is the
  52          * most recent. The first item may be either waiting for the hardware
  53          * to begin writing, or currently being written.
  54          *
  55          * See also: drm_writeback_queue_job() and
  56          * drm_writeback_signal_completion()
  57          */
  58         struct list_head job_queue;
  59
  60         /**
  61          * @fence_context:
  62          *
  63          * timeline context used for fence operations.
  64          */
  65         unsigned int fence_context;
  66         /**
  67          * @fence_lock:
  68          *
  69          * spinlock to protect the fences in the fence_context.
  70          */
  71         spinlock_t fence_lock;
  72         /**
  73          * @fence_seqno:
  74          *
  75          * Seqno variable used as monotonic counter for the fences
  76          * created on the connector's timeline.
  77          */
  78         unsigned long fence_seqno;
  79         /**
  80          * @timeline_name:
  81          *
  82          * The name of the connector's fence timeline.
  83          */
  84         char timeline_name[32];
  85 };
  86
  87 /**
  88  * struct drm_writeback_job - DRM writeback job
  89  */
  90 struct drm_writeback_job {
  91         /**
  92          * @connector:
  93          *
  94          * Back-pointer to the writeback connector associated with the job
  95          */
  96         struct drm_writeback_connector *connector;
  97
  98         /**
  99          * @prepared:
 100          *
 101          * Set when the job has been prepared with drm_writeback_prepare_job()
 102          */
 103         bool prepared;
 104
 105         /**
 106          * @cleanup_work:
 107          *
 108          * Used to allow drm_writeback_signal_completion to defer dropping the
 109          * framebuffer reference to a workqueue
 110          */
 111         struct work_struct cleanup_work;
 112
 113         /**
 114          * @list_entry:
 115          *
 116          * List item for the writeback connector's @job_queue
 117          */
 118         struct list_head list_entry;
 119
 120         /**
 121          * @fb:
 122          *
 123          * Framebuffer to be written to by the writeback connector. Do not set
 124          * directly, use drm_writeback_set_fb()
 125          */
 126         struct drm_framebuffer *fb;
 127
 128         /**
 129          * @out_fence:
 130          *
 131          * Fence which will signal once the writeback has completed
 132          */
 133         struct dma_fence *out_fence;
 134
 135         /**
 136          * @priv:
 137          *
 138          * Driver-private data
 139          */
 140         void *priv;
 141 };
 142
 143 static inline struct drm_writeback_connector *
 144 drm_connector_to_writeback(struct drm_connector *connector)
 145 {
 146         return container_of(connector, struct drm_writeback_connector, base);
 147 }
 148
 149 int drm_writeback_connector_init(struct drm_device *dev,
 150                                  struct drm_writeback_connector *wb_connector,
 151                                  const struct drm_connector_funcs *con_funcs,
 152                                  const struct drm_encoder_helper_funcs *enc_helper_funcs,
 153                                  const u32 *formats, int n_formats);
 154
 155 int drm_writeback_set_fb(struct drm_connector_state *conn_state,
 156                          struct drm_framebuffer *fb);
 157
 158 int drm_writeback_prepare_job(struct drm_writeback_job *job);
 159
 160 void drm_writeback_queue_job(struct drm_writeback_connector *wb_connector,
 161                              struct drm_connector_state *conn_state);
 162
 163 void drm_writeback_cleanup_job(struct drm_writeback_job *job);
 164
 165 void
 166 drm_writeback_signal_completion(struct drm_writeback_connector *wb_connector,
 167                                 int status);
 168
 169 struct dma_fence *
 170 drm_writeback_get_out_fence(struct drm_writeback_connector *wb_connector);
 171 #endif