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