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