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 * For users of drm_writeback_connector_init_with_encoder(), this field
34 * is not valid as the encoder is managed within their drivers.
35 */
36 struct drm_encoder encoder;
37
38 /**
39 * @pixel_formats_blob_ptr:
40 *
41 * DRM blob property data for the pixel formats list on writeback
42 * connectors
43 * See also drm_writeback_connector_init()
44 */
45 struct drm_property_blob *pixel_formats_blob_ptr;
46
47 /** @job_lock: Protects job_queue */
48 spinlock_t job_lock;
49
50 /**
51 * @job_queue:
52 *
53 * Holds a list of a connector's writeback jobs; the last item is the
54 * most recent. The first item may be either waiting for the hardware
55 * to begin writing, or currently being written.
56 *
57 * See also: drm_writeback_queue_job() and
58 * drm_writeback_signal_completion()
59 */
60 struct list_head job_queue;
61
62 /**
63 * @fence_context:
64 *
65 * timeline context used for fence operations.
66 */
67 unsigned int fence_context;
68 /**
69 * @fence_lock:
70 *
71 * spinlock to protect the fences in the fence_context.
72 */
73 spinlock_t fence_lock;
74 /**
75 * @fence_seqno:
76 *
77 * Seqno variable used as monotonic counter for the fences
78 * created on the connector's timeline.
79 */
80 unsigned long fence_seqno;
81 /**
82 * @timeline_name:
83 *
84 * The name of the connector's fence timeline.
85 */
86 char timeline_name[32];
87 };
88
89 /**
90 * struct drm_writeback_job - DRM writeback job
91 */
92 struct drm_writeback_job {
93 /**
94 * @connector:
95 *
96 * Back-pointer to the writeback connector associated with the job
97 */
98 struct drm_writeback_connector *connector;
99
100 /**
101 * @prepared:
102 *
103 * Set when the job has been prepared with drm_writeback_prepare_job()
104 */
105 bool prepared;
106
107 /**
108 * @cleanup_work:
109 *
110 * Used to allow drm_writeback_signal_completion to defer dropping the
111 * framebuffer reference to a workqueue
112 */
113 struct work_struct cleanup_work;
114
115 /**
116 * @list_entry:
117 *
118 * List item for the writeback connector's @job_queue
119 */
120 struct list_head list_entry;
121
122 /**
123 * @fb:
124 *
125 * Framebuffer to be written to by the writeback connector. Do not set
126 * directly, use drm_writeback_set_fb()
127 */
128 struct drm_framebuffer *fb;
129
130 /**
131 * @out_fence:
132 *
133 * Fence which will signal once the writeback has completed
134 */
135 struct dma_fence *out_fence;
136
137 /**
138 * @priv:
139 *
140 * Driver-private data
141 */
142 void *priv;
143 };
144
145 static inline struct drm_writeback_connector *
drm_connector_to_writeback(struct drm_connector * connector)146 drm_connector_to_writeback(struct drm_connector *connector)
147 {
148 return container_of(connector, struct drm_writeback_connector, base);
149 }
150
151 int drm_writeback_connector_init(struct drm_device *dev,
152 struct drm_writeback_connector *wb_connector,
153 const struct drm_connector_funcs *con_funcs,
154 const struct drm_encoder_helper_funcs *enc_helper_funcs,
155 const u32 *formats, int n_formats,
156 u32 possible_crtcs);
157
158 int drm_writeback_connector_init_with_encoder(struct drm_device *dev,
159 struct drm_writeback_connector *wb_connector,
160 struct drm_encoder *enc,
161 const struct drm_connector_funcs *con_funcs, const u32 *formats,
162 int n_formats);
163
164 int drm_writeback_set_fb(struct drm_connector_state *conn_state,
165 struct drm_framebuffer *fb);
166
167 int drm_writeback_prepare_job(struct drm_writeback_job *job);
168
169 void drm_writeback_queue_job(struct drm_writeback_connector *wb_connector,
170 struct drm_connector_state *conn_state);
171
172 void drm_writeback_cleanup_job(struct drm_writeback_job *job);
173
174 void
175 drm_writeback_signal_completion(struct drm_writeback_connector *wb_connector,
176 int status);
177
178 struct dma_fence *
179 drm_writeback_get_out_fence(struct drm_writeback_connector *wb_connector);
180 #endif
181