1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 3 #ifndef DRM_GEM_VRAM_HELPER_H 4 #define DRM_GEM_VRAM_HELPER_H 5 6 #include <drm/drm_file.h> 7 #include <drm/drm_gem.h> 8 #include <drm/drm_gem_ttm_helper.h> 9 #include <drm/drm_ioctl.h> 10 #include <drm/drm_modes.h> 11 #include <drm/ttm/ttm_bo.h> 12 #include <drm/ttm/ttm_placement.h> 13 14 #include <linux/container_of.h> 15 #include <linux/iosys-map.h> 16 17 struct drm_mode_create_dumb; 18 struct drm_plane; 19 struct drm_plane_state; 20 struct filp; 21 struct vm_area_struct; 22 23 #define DRM_GEM_VRAM_PL_FLAG_SYSTEM (1 << 0) 24 #define DRM_GEM_VRAM_PL_FLAG_VRAM (1 << 1) 25 #define DRM_GEM_VRAM_PL_FLAG_TOPDOWN (1 << 2) 26 27 /* 28 * Buffer-object helpers 29 */ 30 31 /** 32 * struct drm_gem_vram_object - GEM object backed by VRAM 33 * @bo: TTM buffer object 34 * @map: Mapping information for @bo 35 * @placement: TTM placement information. Supported placements are %TTM_PL_VRAM 36 * and %TTM_PL_SYSTEM 37 * @placements: TTM placement information. 38 * 39 * The type struct drm_gem_vram_object represents a GEM object that is 40 * backed by VRAM. It can be used for simple framebuffer devices with 41 * dedicated memory. The buffer object can be evicted to system memory if 42 * video memory becomes scarce. 43 * 44 * GEM VRAM objects perform reference counting for pin and mapping 45 * operations. So a buffer object that has been pinned N times with 46 * drm_gem_vram_pin() must be unpinned N times with 47 * drm_gem_vram_unpin(). The same applies to pairs of 48 * drm_gem_vram_kmap() and drm_gem_vram_kunmap(), as well as pairs of 49 * drm_gem_vram_vmap() and drm_gem_vram_vunmap(). 50 */ 51 struct drm_gem_vram_object { 52 struct ttm_buffer_object bo; 53 struct iosys_map map; 54 55 /** 56 * @vmap_use_count: 57 * 58 * Reference count on the virtual address. 59 * The address are un-mapped when the count reaches zero. 60 */ 61 unsigned int vmap_use_count; 62 63 /* Supported placements are %TTM_PL_VRAM and %TTM_PL_SYSTEM */ 64 struct ttm_placement placement; 65 struct ttm_place placements[2]; 66 }; 67 68 /** 69 * drm_gem_vram_of_bo - Returns the container of type 70 * &struct drm_gem_vram_object for field bo. 71 * @bo: the VRAM buffer object 72 * Returns: The containing GEM VRAM object 73 */ 74 static inline struct drm_gem_vram_object *drm_gem_vram_of_bo( 75 struct ttm_buffer_object *bo) 76 { 77 return container_of(bo, struct drm_gem_vram_object, bo); 78 } 79 80 /** 81 * drm_gem_vram_of_gem - Returns the container of type 82 * &struct drm_gem_vram_object for field gem. 83 * @gem: the GEM object 84 * Returns: The containing GEM VRAM object 85 */ 86 static inline struct drm_gem_vram_object *drm_gem_vram_of_gem( 87 struct drm_gem_object *gem) 88 { 89 return container_of(gem, struct drm_gem_vram_object, bo.base); 90 } 91 92 struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev, 93 size_t size, 94 unsigned long pg_align); 95 void drm_gem_vram_put(struct drm_gem_vram_object *gbo); 96 s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo); 97 int drm_gem_vram_pin(struct drm_gem_vram_object *gbo, unsigned long pl_flag); 98 int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo); 99 int drm_gem_vram_vmap(struct drm_gem_vram_object *gbo, struct iosys_map *map); 100 void drm_gem_vram_vunmap(struct drm_gem_vram_object *gbo, 101 struct iosys_map *map); 102 103 int drm_gem_vram_fill_create_dumb(struct drm_file *file, 104 struct drm_device *dev, 105 unsigned long pg_align, 106 unsigned long pitch_align, 107 struct drm_mode_create_dumb *args); 108 109 /* 110 * Helpers for struct drm_driver 111 */ 112 113 int drm_gem_vram_driver_dumb_create(struct drm_file *file, 114 struct drm_device *dev, 115 struct drm_mode_create_dumb *args); 116 117 /* 118 * Helpers for struct drm_plane_helper_funcs 119 */ 120 int 121 drm_gem_vram_plane_helper_prepare_fb(struct drm_plane *plane, 122 struct drm_plane_state *new_state); 123 void 124 drm_gem_vram_plane_helper_cleanup_fb(struct drm_plane *plane, 125 struct drm_plane_state *old_state); 126 127 /** 128 * DRM_GEM_VRAM_PLANE_HELPER_FUNCS - Initializes struct drm_plane_helper_funcs 129 * for VRAM handling 130 * 131 * Drivers may use GEM BOs as VRAM helpers for the framebuffer memory. This 132 * macro initializes struct drm_plane_helper_funcs to use the respective helper 133 * functions. 134 */ 135 #define DRM_GEM_VRAM_PLANE_HELPER_FUNCS \ 136 .prepare_fb = drm_gem_vram_plane_helper_prepare_fb, \ 137 .cleanup_fb = drm_gem_vram_plane_helper_cleanup_fb 138 139 /** 140 * define DRM_GEM_VRAM_DRIVER - default callback functions for 141 * &struct drm_driver 142 * 143 * Drivers that use VRAM MM and GEM VRAM can use this macro to initialize 144 * &struct drm_driver with default functions. 145 */ 146 #define DRM_GEM_VRAM_DRIVER \ 147 .debugfs_init = drm_vram_mm_debugfs_init, \ 148 .dumb_create = drm_gem_vram_driver_dumb_create, \ 149 .dumb_map_offset = drm_gem_ttm_dumb_map_offset 150 151 /* 152 * VRAM memory manager 153 */ 154 155 /** 156 * struct drm_vram_mm - An instance of VRAM MM 157 * @vram_base: Base address of the managed video memory 158 * @vram_size: Size of the managed video memory in bytes 159 * @bdev: The TTM BO device. 160 * 161 * The fields &struct drm_vram_mm.vram_base and 162 * &struct drm_vram_mm.vrm_size are managed by VRAM MM, but are 163 * available for public read access. Use the field 164 * &struct drm_vram_mm.bdev to access the TTM BO device. 165 */ 166 struct drm_vram_mm { 167 uint64_t vram_base; 168 size_t vram_size; 169 170 struct ttm_device bdev; 171 }; 172 173 /** 174 * drm_vram_mm_of_bdev() - Returns the container of type &struct ttm_device for 175 * field bdev. 176 * @bdev: the TTM BO device 177 * 178 * Returns: 179 * The containing instance of &struct drm_vram_mm 180 */ 181 static inline struct drm_vram_mm *drm_vram_mm_of_bdev( 182 struct ttm_device *bdev) 183 { 184 return container_of(bdev, struct drm_vram_mm, bdev); 185 } 186 187 void drm_vram_mm_debugfs_init(struct drm_minor *minor); 188 189 /* 190 * Helpers for integration with struct drm_device 191 */ 192 193 int drmm_vram_helper_init(struct drm_device *dev, uint64_t vram_base, 194 size_t vram_size); 195 196 /* 197 * Mode-config helpers 198 */ 199 200 enum drm_mode_status 201 drm_vram_helper_mode_valid(struct drm_device *dev, 202 const struct drm_display_mode *mode); 203 204 #endif 205