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/dma-buf-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 dma_buf_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 dma_buf_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_prepare_shadow_fb(struct drm_plane *plane, struct drm_plane_state *plane_state); 107 void drm_gem_cleanup_shadow_fb(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 .prepare_fb = drm_gem_prepare_shadow_fb, \ 119 .cleanup_fb = drm_gem_cleanup_shadow_fb 120 121 int drm_gem_simple_kms_prepare_shadow_fb(struct drm_simple_display_pipe *pipe, 122 struct drm_plane_state *plane_state); 123 void drm_gem_simple_kms_cleanup_shadow_fb(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 .prepare_fb = drm_gem_simple_kms_prepare_shadow_fb, \ 141 .cleanup_fb = drm_gem_simple_kms_cleanup_shadow_fb, \ 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