1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2
3 #ifndef __DRM_GEM_ATOMIC_HELPER_H__
4 #define __DRM_GEM_ATOMIC_HELPER_H__
5
6 #include <linux/iosys-map.h>
7
8 #include <drm/drm_format_helper.h>
9 #include <drm/drm_fourcc.h>
10 #include <drm/drm_plane.h>
11
12 struct drm_simple_display_pipe;
13
14 /*
15 * Plane Helpers
16 */
17
18 int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state);
19
20 /*
21 * Helpers for planes with shadow buffers
22 */
23
24 /**
25 * DRM_SHADOW_PLANE_MAX_WIDTH - Maximum width of a plane's shadow buffer in pixels
26 *
27 * For drivers with shadow planes, the maximum width of the framebuffer is
28 * usually independent from hardware limitations. Drivers can initialize struct
29 * drm_mode_config.max_width from DRM_SHADOW_PLANE_MAX_WIDTH.
30 */
31 #define DRM_SHADOW_PLANE_MAX_WIDTH (4096u)
32
33 /**
34 * DRM_SHADOW_PLANE_MAX_HEIGHT - Maximum height of a plane's shadow buffer in scanlines
35 *
36 * For drivers with shadow planes, the maximum height of the framebuffer is
37 * usually independent from hardware limitations. Drivers can initialize struct
38 * drm_mode_config.max_height from DRM_SHADOW_PLANE_MAX_HEIGHT.
39 */
40 #define DRM_SHADOW_PLANE_MAX_HEIGHT (4096u)
41
42 /**
43 * struct drm_shadow_plane_state - plane state for planes with shadow buffers
44 *
45 * For planes that use a shadow buffer, struct drm_shadow_plane_state
46 * provides the regular plane state plus mappings of the shadow buffer
47 * into kernel address space.
48 */
49 struct drm_shadow_plane_state {
50 /** @base: plane state */
51 struct drm_plane_state base;
52
53 /**
54 * @fmtcnv_state: Format-conversion state
55 *
56 * Per-plane state for format conversion.
57 * Flags for copying shadow buffers into backend storage. Also holds
58 * temporary storage for format conversion.
59 */
60 struct drm_format_conv_state fmtcnv_state;
61
62 /* Transitional state - do not export or duplicate */
63
64 /**
65 * @map: Mappings of the plane's framebuffer BOs in to kernel address space
66 *
67 * The memory mappings stored in map should be established in the plane's
68 * prepare_fb callback and removed in the cleanup_fb callback.
69 */
70 struct iosys_map map[DRM_FORMAT_MAX_PLANES];
71
72 /**
73 * @data: Address of each framebuffer BO's data
74 *
75 * The address of the data stored in each mapping. This is different
76 * for framebuffers with non-zero offset fields.
77 */
78 struct iosys_map data[DRM_FORMAT_MAX_PLANES];
79 };
80
81 /**
82 * to_drm_shadow_plane_state - upcasts from struct drm_plane_state
83 * @state: the plane state
84 */
85 static inline struct drm_shadow_plane_state *
86 to_drm_shadow_plane_state(struct drm_plane_state *state)
87 {
88 return container_of(state, struct drm_shadow_plane_state, base);
89 }
90
91 void __drm_gem_duplicate_shadow_plane_state(struct drm_plane *plane,
92 struct drm_shadow_plane_state *new_shadow_plane_state);
93 void __drm_gem_destroy_shadow_plane_state(struct drm_shadow_plane_state *shadow_plane_state);
94 void __drm_gem_reset_shadow_plane(struct drm_plane *plane,
95 struct drm_shadow_plane_state *shadow_plane_state);
96
97 void drm_gem_reset_shadow_plane(struct drm_plane *plane);
98 struct drm_plane_state *drm_gem_duplicate_shadow_plane_state(struct drm_plane *plane);
99 void drm_gem_destroy_shadow_plane_state(struct drm_plane *plane,
100 struct drm_plane_state *plane_state);
101
102 /**
103 * DRM_GEM_SHADOW_PLANE_FUNCS -
104 * Initializes struct drm_plane_funcs for shadow-buffered planes
105 *
106 * Drivers may use GEM BOs as shadow buffers over the framebuffer memory. This
107 * macro initializes struct drm_plane_funcs to use the rsp helper functions.
108 */
109 #define DRM_GEM_SHADOW_PLANE_FUNCS \
110 .reset = drm_gem_reset_shadow_plane, \
111 .atomic_duplicate_state = drm_gem_duplicate_shadow_plane_state, \
112 .atomic_destroy_state = drm_gem_destroy_shadow_plane_state
113
114 int drm_gem_begin_shadow_fb_access(struct drm_plane *plane, struct drm_plane_state *plane_state);
115 void drm_gem_end_shadow_fb_access(struct drm_plane *plane, struct drm_plane_state *plane_state);
116
117 /**
118 * DRM_GEM_SHADOW_PLANE_HELPER_FUNCS -
119 * Initializes struct drm_plane_helper_funcs for shadow-buffered planes
120 *
121 * Drivers may use GEM BOs as shadow buffers over the framebuffer memory. This
122 * macro initializes struct drm_plane_helper_funcs to use the rsp helper
123 * functions.
124 */
125 #define DRM_GEM_SHADOW_PLANE_HELPER_FUNCS \
126 .begin_fb_access = drm_gem_begin_shadow_fb_access, \
127 .end_fb_access = drm_gem_end_shadow_fb_access
128
129 int drm_gem_simple_kms_begin_shadow_fb_access(struct drm_simple_display_pipe *pipe,
130 struct drm_plane_state *plane_state);
131 void drm_gem_simple_kms_end_shadow_fb_access(struct drm_simple_display_pipe *pipe,
132 struct drm_plane_state *plane_state);
133 void drm_gem_simple_kms_reset_shadow_plane(struct drm_simple_display_pipe *pipe);
134 struct drm_plane_state *
135 drm_gem_simple_kms_duplicate_shadow_plane_state(struct drm_simple_display_pipe *pipe);
136 void drm_gem_simple_kms_destroy_shadow_plane_state(struct drm_simple_display_pipe *pipe,
137 struct drm_plane_state *plane_state);
138
139 /**
140 * DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS -
141 * Initializes struct drm_simple_display_pipe_funcs for shadow-buffered planes
142 *
143 * Drivers may use GEM BOs as shadow buffers over the framebuffer memory. This
144 * macro initializes struct drm_simple_display_pipe_funcs to use the rsp helper
145 * functions.
146 */
147 #define DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS \
148 .begin_fb_access = drm_gem_simple_kms_begin_shadow_fb_access, \
149 .end_fb_access = drm_gem_simple_kms_end_shadow_fb_access, \
150 .reset_plane = drm_gem_simple_kms_reset_shadow_plane, \
151 .duplicate_plane_state = drm_gem_simple_kms_duplicate_shadow_plane_state, \
152 .destroy_plane_state = drm_gem_simple_kms_destroy_shadow_plane_state
153
154 #endif /* __DRM_GEM_ATOMIC_HELPER_H__ */
155
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