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_ioctl.h> 9 #include <drm/ttm/ttm_bo_api.h> 10 #include <drm/ttm/ttm_bo_driver.h> 11 #include <drm/ttm/ttm_placement.h> 12 13 #include <linux/kernel.h> /* for container_of() */ 14 15 struct drm_mode_create_dumb; 16 struct drm_plane; 17 struct drm_plane_state; 18 struct drm_simple_display_pipe; 19 struct filp; 20 struct vm_area_struct; 21 22 #define DRM_GEM_VRAM_PL_FLAG_VRAM TTM_PL_FLAG_VRAM 23 #define DRM_GEM_VRAM_PL_FLAG_SYSTEM TTM_PL_FLAG_SYSTEM 24 #define DRM_GEM_VRAM_PL_FLAG_TOPDOWN TTM_PL_FLAG_TOPDOWN 25 26 /* 27 * Buffer-object helpers 28 */ 29 30 /** 31 * struct drm_gem_vram_object - GEM object backed by VRAM 32 * @gem: GEM object 33 * @bo: TTM buffer object 34 * @kmap: Mapping information for @bo 35 * @placement: TTM placement information. Supported placements are \ 36 %TTM_PL_VRAM and %TTM_PL_SYSTEM 37 * @placements: TTM placement information. 38 * @pin_count: Pin counter 39 * 40 * The type struct drm_gem_vram_object represents a GEM object that is 41 * backed by VRAM. It can be used for simple framebuffer devices with 42 * dedicated memory. The buffer object can be evicted to system memory if 43 * video memory becomes scarce. 44 * 45 * GEM VRAM objects perform reference counting for pin and mapping 46 * operations. So a buffer object that has been pinned N times with 47 * drm_gem_vram_pin() must be unpinned N times with 48 * drm_gem_vram_unpin(). The same applies to pairs of 49 * drm_gem_vram_kmap() and drm_gem_vram_kunmap(), as well as pairs of 50 * drm_gem_vram_vmap() and drm_gem_vram_vunmap(). 51 */ 52 struct drm_gem_vram_object { 53 struct ttm_buffer_object bo; 54 struct ttm_bo_kmap_obj kmap; 55 56 /** 57 * @kmap_use_count: 58 * 59 * Reference count on the virtual address. 60 * The address are un-mapped when the count reaches zero. 61 */ 62 unsigned int kmap_use_count; 63 64 /* Supported placements are %TTM_PL_VRAM and %TTM_PL_SYSTEM */ 65 struct ttm_placement placement; 66 struct ttm_place placements[2]; 67 68 int pin_count; 69 }; 70 71 /** 72 * Returns the container of type &struct drm_gem_vram_object 73 * for field bo. 74 * @bo: the VRAM buffer object 75 * Returns: The containing GEM VRAM object 76 */ 77 static inline struct drm_gem_vram_object *drm_gem_vram_of_bo( 78 struct ttm_buffer_object *bo) 79 { 80 return container_of(bo, struct drm_gem_vram_object, bo); 81 } 82 83 /** 84 * Returns the container of type &struct drm_gem_vram_object 85 * for field gem. 86 * @gem: the GEM object 87 * Returns: The containing GEM VRAM object 88 */ 89 static inline struct drm_gem_vram_object *drm_gem_vram_of_gem( 90 struct drm_gem_object *gem) 91 { 92 return container_of(gem, struct drm_gem_vram_object, bo.base); 93 } 94 95 struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev, 96 struct ttm_bo_device *bdev, 97 size_t size, 98 unsigned long pg_align, 99 bool interruptible); 100 void drm_gem_vram_put(struct drm_gem_vram_object *gbo); 101 u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo); 102 s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo); 103 int drm_gem_vram_pin(struct drm_gem_vram_object *gbo, unsigned long pl_flag); 104 int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo); 105 void *drm_gem_vram_kmap(struct drm_gem_vram_object *gbo, bool map, 106 bool *is_iomem); 107 void drm_gem_vram_kunmap(struct drm_gem_vram_object *gbo); 108 void *drm_gem_vram_vmap(struct drm_gem_vram_object *gbo); 109 void drm_gem_vram_vunmap(struct drm_gem_vram_object *gbo, void *vaddr); 110 111 int drm_gem_vram_fill_create_dumb(struct drm_file *file, 112 struct drm_device *dev, 113 struct ttm_bo_device *bdev, 114 unsigned long pg_align, 115 bool interruptible, 116 struct drm_mode_create_dumb *args); 117 118 /* 119 * Helpers for struct drm_driver 120 */ 121 122 int drm_gem_vram_driver_dumb_create(struct drm_file *file, 123 struct drm_device *dev, 124 struct drm_mode_create_dumb *args); 125 int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file, 126 struct drm_device *dev, 127 uint32_t handle, uint64_t *offset); 128 129 /* 130 * Helpers for struct drm_plane_helper_funcs 131 */ 132 int 133 drm_gem_vram_plane_helper_prepare_fb(struct drm_plane *plane, 134 struct drm_plane_state *new_state); 135 void 136 drm_gem_vram_plane_helper_cleanup_fb(struct drm_plane *plane, 137 struct drm_plane_state *old_state); 138 139 /* 140 * Helpers for struct drm_simple_display_pipe_funcs 141 */ 142 143 int drm_gem_vram_simple_display_pipe_prepare_fb( 144 struct drm_simple_display_pipe *pipe, 145 struct drm_plane_state *new_state); 146 147 void drm_gem_vram_simple_display_pipe_cleanup_fb( 148 struct drm_simple_display_pipe *pipe, 149 struct drm_plane_state *old_state); 150 151 /** 152 * define DRM_GEM_VRAM_DRIVER - default callback functions for \ 153 &struct drm_driver 154 * 155 * Drivers that use VRAM MM and GEM VRAM can use this macro to initialize 156 * &struct drm_driver with default functions. 157 */ 158 #define DRM_GEM_VRAM_DRIVER \ 159 .debugfs_init = drm_vram_mm_debugfs_init, \ 160 .dumb_create = drm_gem_vram_driver_dumb_create, \ 161 .dumb_map_offset = drm_gem_vram_driver_dumb_mmap_offset, \ 162 .gem_prime_mmap = drm_gem_prime_mmap 163 164 /* 165 * VRAM memory manager 166 */ 167 168 /** 169 * struct drm_vram_mm - An instance of VRAM MM 170 * @vram_base: Base address of the managed video memory 171 * @vram_size: Size of the managed video memory in bytes 172 * @bdev: The TTM BO device. 173 * @funcs: TTM BO functions 174 * 175 * The fields &struct drm_vram_mm.vram_base and 176 * &struct drm_vram_mm.vrm_size are managed by VRAM MM, but are 177 * available for public read access. Use the field 178 * &struct drm_vram_mm.bdev to access the TTM BO device. 179 */ 180 struct drm_vram_mm { 181 uint64_t vram_base; 182 size_t vram_size; 183 184 struct ttm_bo_device bdev; 185 }; 186 187 /** 188 * drm_vram_mm_of_bdev() - \ 189 Returns the container of type &struct ttm_bo_device for field bdev. 190 * @bdev: the TTM BO device 191 * 192 * Returns: 193 * The containing instance of &struct drm_vram_mm 194 */ 195 static inline struct drm_vram_mm *drm_vram_mm_of_bdev( 196 struct ttm_bo_device *bdev) 197 { 198 return container_of(bdev, struct drm_vram_mm, bdev); 199 } 200 201 int drm_vram_mm_debugfs_init(struct drm_minor *minor); 202 203 /* 204 * Helpers for integration with struct drm_device 205 */ 206 207 struct drm_vram_mm *drm_vram_helper_alloc_mm( 208 struct drm_device *dev, uint64_t vram_base, size_t vram_size); 209 void drm_vram_helper_release_mm(struct drm_device *dev); 210 211 #endif 212