1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef __DRM_GEM_SHMEM_HELPER_H__ 4 #define __DRM_GEM_SHMEM_HELPER_H__ 5 6 #include <linux/fs.h> 7 #include <linux/mm.h> 8 #include <linux/mutex.h> 9 10 #include <drm/drm_file.h> 11 #include <drm/drm_gem.h> 12 #include <drm/drm_ioctl.h> 13 #include <drm/drm_prime.h> 14 15 struct dma_buf_attachment; 16 struct drm_mode_create_dumb; 17 struct drm_printer; 18 struct sg_table; 19 20 /** 21 * struct drm_gem_shmem_object - GEM object backed by shmem 22 */ 23 struct drm_gem_shmem_object { 24 /** 25 * @base: Base GEM object 26 */ 27 struct drm_gem_object base; 28 29 /** 30 * @pages_lock: Protects the page table and use count 31 */ 32 struct mutex pages_lock; 33 34 /** 35 * @pages: Page table 36 */ 37 struct page **pages; 38 39 /** 40 * @pages_use_count: 41 * 42 * Reference count on the pages table. 43 * The pages are put when the count reaches zero. 44 */ 45 unsigned int pages_use_count; 46 47 /** 48 * @madv: State for madvise 49 * 50 * 0 is active/inuse. 51 * A negative value is the object is purged. 52 * Positive values are driver specific and not used by the helpers. 53 */ 54 int madv; 55 56 /** 57 * @madv_list: List entry for madvise tracking 58 * 59 * Typically used by drivers to track purgeable objects 60 */ 61 struct list_head madv_list; 62 63 /** 64 * @pages_mark_dirty_on_put: 65 * 66 * Mark pages as dirty when they are put. 67 */ 68 unsigned int pages_mark_dirty_on_put : 1; 69 70 /** 71 * @pages_mark_accessed_on_put: 72 * 73 * Mark pages as accessed when they are put. 74 */ 75 unsigned int pages_mark_accessed_on_put : 1; 76 77 /** 78 * @sgt: Scatter/gather table for imported PRIME buffers 79 */ 80 struct sg_table *sgt; 81 82 /** 83 * @vmap_lock: Protects the vmap address and use count 84 */ 85 struct mutex vmap_lock; 86 87 /** 88 * @vaddr: Kernel virtual address of the backing memory 89 */ 90 void *vaddr; 91 92 /** 93 * @vmap_use_count: 94 * 95 * Reference count on the virtual address. 96 * The address are un-mapped when the count reaches zero. 97 */ 98 unsigned int vmap_use_count; 99 100 /** 101 * @map_wc: map object write-combined (instead of using shmem defaults). 102 */ 103 bool map_wc; 104 }; 105 106 #define to_drm_gem_shmem_obj(obj) \ 107 container_of(obj, struct drm_gem_shmem_object, base) 108 109 struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t size); 110 void drm_gem_shmem_free(struct drm_gem_shmem_object *shmem); 111 112 int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem); 113 void drm_gem_shmem_put_pages(struct drm_gem_shmem_object *shmem); 114 int drm_gem_shmem_pin(struct drm_gem_shmem_object *shmem); 115 void drm_gem_shmem_unpin(struct drm_gem_shmem_object *shmem); 116 int drm_gem_shmem_vmap(struct drm_gem_shmem_object *shmem, struct dma_buf_map *map); 117 void drm_gem_shmem_vunmap(struct drm_gem_shmem_object *shmem, struct dma_buf_map *map); 118 int drm_gem_shmem_mmap(struct drm_gem_shmem_object *shmem, struct vm_area_struct *vma); 119 120 int drm_gem_shmem_madvise(struct drm_gem_shmem_object *shmem, int madv); 121 122 static inline bool drm_gem_shmem_is_purgeable(struct drm_gem_shmem_object *shmem) 123 { 124 return (shmem->madv > 0) && 125 !shmem->vmap_use_count && shmem->sgt && 126 !shmem->base.dma_buf && !shmem->base.import_attach; 127 } 128 129 void drm_gem_shmem_purge_locked(struct drm_gem_shmem_object *shmem); 130 bool drm_gem_shmem_purge(struct drm_gem_shmem_object *shmem); 131 132 struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_shmem_object *shmem); 133 struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_shmem_object *shmem); 134 135 void drm_gem_shmem_print_info(const struct drm_gem_shmem_object *shmem, 136 struct drm_printer *p, unsigned int indent); 137 138 extern const struct vm_operations_struct drm_gem_shmem_vm_ops; 139 140 /* 141 * GEM object functions 142 */ 143 144 /** 145 * drm_gem_shmem_object_free - GEM object function for drm_gem_shmem_free() 146 * @obj: GEM object to free 147 * 148 * This function wraps drm_gem_shmem_free(). Drivers that employ the shmem helpers 149 * should use it as their &drm_gem_object_funcs.free handler. 150 */ 151 static inline void drm_gem_shmem_object_free(struct drm_gem_object *obj) 152 { 153 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); 154 155 drm_gem_shmem_free(shmem); 156 } 157 158 /** 159 * drm_gem_shmem_object_print_info() - Print &drm_gem_shmem_object info for debugfs 160 * @p: DRM printer 161 * @indent: Tab indentation level 162 * @obj: GEM object 163 * 164 * This function wraps drm_gem_shmem_print_info(). Drivers that employ the shmem helpers should 165 * use this function as their &drm_gem_object_funcs.print_info handler. 166 */ 167 static inline void drm_gem_shmem_object_print_info(struct drm_printer *p, unsigned int indent, 168 const struct drm_gem_object *obj) 169 { 170 const struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); 171 172 drm_gem_shmem_print_info(shmem, p, indent); 173 } 174 175 /** 176 * drm_gem_shmem_object_pin - GEM object function for drm_gem_shmem_pin() 177 * @obj: GEM object 178 * 179 * This function wraps drm_gem_shmem_pin(). Drivers that employ the shmem helpers should 180 * use it as their &drm_gem_object_funcs.pin handler. 181 */ 182 static inline int drm_gem_shmem_object_pin(struct drm_gem_object *obj) 183 { 184 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); 185 186 return drm_gem_shmem_pin(shmem); 187 } 188 189 /** 190 * drm_gem_shmem_object_unpin - GEM object function for drm_gem_shmem_unpin() 191 * @obj: GEM object 192 * 193 * This function wraps drm_gem_shmem_unpin(). Drivers that employ the shmem helpers should 194 * use it as their &drm_gem_object_funcs.unpin handler. 195 */ 196 static inline void drm_gem_shmem_object_unpin(struct drm_gem_object *obj) 197 { 198 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); 199 200 drm_gem_shmem_unpin(shmem); 201 } 202 203 /** 204 * drm_gem_shmem_object_get_sg_table - GEM object function for drm_gem_shmem_get_sg_table() 205 * @obj: GEM object 206 * 207 * This function wraps drm_gem_shmem_get_sg_table(). Drivers that employ the shmem helpers should 208 * use it as their &drm_gem_object_funcs.get_sg_table handler. 209 * 210 * Returns: 211 * A pointer to the scatter/gather table of pinned pages or NULL on failure. 212 */ 213 static inline struct sg_table *drm_gem_shmem_object_get_sg_table(struct drm_gem_object *obj) 214 { 215 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); 216 217 return drm_gem_shmem_get_sg_table(shmem); 218 } 219 220 /* 221 * drm_gem_shmem_object_vmap - GEM object function for drm_gem_shmem_vmap() 222 * @obj: GEM object 223 * @map: Returns the kernel virtual address of the SHMEM GEM object's backing store. 224 * 225 * This function wraps drm_gem_shmem_vmap(). Drivers that employ the shmem helpers should 226 * use it as their &drm_gem_object_funcs.vmap handler. 227 * 228 * Returns: 229 * 0 on success or a negative error code on failure. 230 */ 231 static inline int drm_gem_shmem_object_vmap(struct drm_gem_object *obj, struct dma_buf_map *map) 232 { 233 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); 234 235 return drm_gem_shmem_vmap(shmem, map); 236 } 237 238 /* 239 * drm_gem_shmem_object_vunmap - GEM object function for drm_gem_shmem_vunmap() 240 * @obj: GEM object 241 * @map: Kernel virtual address where the SHMEM GEM object was mapped 242 * 243 * This function wraps drm_gem_shmem_vunmap(). Drivers that employ the shmem helpers should 244 * use it as their &drm_gem_object_funcs.vunmap handler. 245 */ 246 static inline void drm_gem_shmem_object_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map) 247 { 248 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); 249 250 drm_gem_shmem_vunmap(shmem, map); 251 } 252 253 /** 254 * drm_gem_shmem_object_mmap - GEM object function for drm_gem_shmem_mmap() 255 * @obj: GEM object 256 * @vma: VMA for the area to be mapped 257 * 258 * This function wraps drm_gem_shmem_mmap(). Drivers that employ the shmem helpers should 259 * use it as their &drm_gem_object_funcs.mmap handler. 260 * 261 * Returns: 262 * 0 on success or a negative error code on failure. 263 */ 264 static inline int drm_gem_shmem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) 265 { 266 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); 267 268 return drm_gem_shmem_mmap(shmem, vma); 269 } 270 271 /* 272 * Driver ops 273 */ 274 275 struct drm_gem_object * 276 drm_gem_shmem_prime_import_sg_table(struct drm_device *dev, 277 struct dma_buf_attachment *attach, 278 struct sg_table *sgt); 279 int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev, 280 struct drm_mode_create_dumb *args); 281 282 /** 283 * DRM_GEM_SHMEM_DRIVER_OPS - Default shmem GEM operations 284 * 285 * This macro provides a shortcut for setting the shmem GEM operations in 286 * the &drm_driver structure. 287 */ 288 #define DRM_GEM_SHMEM_DRIVER_OPS \ 289 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, \ 290 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, \ 291 .gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table, \ 292 .gem_prime_mmap = drm_gem_prime_mmap, \ 293 .dumb_create = drm_gem_shmem_dumb_create 294 295 #endif /* __DRM_GEM_SHMEM_HELPER_H__ */ 296