1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __DRM_GEM_DMA_HELPER_H__ 3 #define __DRM_GEM_DMA_HELPER_H__ 4 5 #include <drm/drm_file.h> 6 #include <drm/drm_ioctl.h> 7 #include <drm/drm_gem.h> 8 9 struct drm_mode_create_dumb; 10 11 /** 12 * struct drm_gem_dma_object - GEM object backed by DMA memory allocations 13 * @base: base GEM object 14 * @dma_addr: DMA address of the backing memory 15 * @sgt: scatter/gather table for imported PRIME buffers. The table can have 16 * more than one entry but they are guaranteed to have contiguous 17 * DMA addresses. 18 * @vaddr: kernel virtual address of the backing memory 19 * @map_noncoherent: if true, the GEM object is backed by non-coherent memory 20 */ 21 struct drm_gem_dma_object { 22 struct drm_gem_object base; 23 dma_addr_t dma_addr; 24 struct sg_table *sgt; 25 26 /* For objects with DMA memory allocated by GEM DMA */ 27 void *vaddr; 28 29 bool map_noncoherent; 30 }; 31 32 #define to_drm_gem_dma_obj(gem_obj) \ 33 container_of(gem_obj, struct drm_gem_dma_object, base) 34 35 struct drm_gem_dma_object *drm_gem_dma_create(struct drm_device *drm, 36 size_t size); 37 void drm_gem_dma_free(struct drm_gem_dma_object *dma_obj); 38 void drm_gem_dma_print_info(const struct drm_gem_dma_object *dma_obj, 39 struct drm_printer *p, unsigned int indent); 40 struct sg_table *drm_gem_dma_get_sg_table(struct drm_gem_dma_object *dma_obj); 41 int drm_gem_dma_vmap(struct drm_gem_dma_object *dma_obj, 42 struct iosys_map *map); 43 int drm_gem_dma_mmap(struct drm_gem_dma_object *dma_obj, struct vm_area_struct *vma); 44 45 extern const struct vm_operations_struct drm_gem_dma_vm_ops; 46 47 /* 48 * GEM object functions 49 */ 50 51 /** 52 * drm_gem_dma_object_free - GEM object function for drm_gem_dma_free() 53 * @obj: GEM object to free 54 * 55 * This function wraps drm_gem_dma_free_object(). Drivers that employ the DMA helpers 56 * should use it as their &drm_gem_object_funcs.free handler. 57 */ 58 static inline void drm_gem_dma_object_free(struct drm_gem_object *obj) 59 { 60 struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj); 61 62 drm_gem_dma_free(dma_obj); 63 } 64 65 /** 66 * drm_gem_dma_object_print_info() - Print &drm_gem_dma_object info for debugfs 67 * @p: DRM printer 68 * @indent: Tab indentation level 69 * @obj: GEM object 70 * 71 * This function wraps drm_gem_dma_print_info(). Drivers that employ the DMA helpers 72 * should use this function as their &drm_gem_object_funcs.print_info handler. 73 */ 74 static inline void drm_gem_dma_object_print_info(struct drm_printer *p, unsigned int indent, 75 const struct drm_gem_object *obj) 76 { 77 const struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj); 78 79 drm_gem_dma_print_info(dma_obj, p, indent); 80 } 81 82 /** 83 * drm_gem_dma_object_get_sg_table - GEM object function for drm_gem_dma_get_sg_table() 84 * @obj: GEM object 85 * 86 * This function wraps drm_gem_dma_get_sg_table(). Drivers that employ the DMA helpers should 87 * use it as their &drm_gem_object_funcs.get_sg_table handler. 88 * 89 * Returns: 90 * A pointer to the scatter/gather table of pinned pages or NULL on failure. 91 */ 92 static inline struct sg_table *drm_gem_dma_object_get_sg_table(struct drm_gem_object *obj) 93 { 94 struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj); 95 96 return drm_gem_dma_get_sg_table(dma_obj); 97 } 98 99 /* 100 * drm_gem_dma_object_vmap - GEM object function for drm_gem_dma_vmap() 101 * @obj: GEM object 102 * @map: Returns the kernel virtual address of the DMA GEM object's backing store. 103 * 104 * This function wraps drm_gem_dma_vmap(). Drivers that employ the DMA helpers should 105 * use it as their &drm_gem_object_funcs.vmap handler. 106 * 107 * Returns: 108 * 0 on success or a negative error code on failure. 109 */ 110 static inline int drm_gem_dma_object_vmap(struct drm_gem_object *obj, 111 struct iosys_map *map) 112 { 113 struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj); 114 115 return drm_gem_dma_vmap(dma_obj, map); 116 } 117 118 /** 119 * drm_gem_dma_object_mmap - GEM object function for drm_gem_dma_mmap() 120 * @obj: GEM object 121 * @vma: VMA for the area to be mapped 122 * 123 * This function wraps drm_gem_dma_mmap(). Drivers that employ the dma helpers should 124 * use it as their &drm_gem_object_funcs.mmap handler. 125 * 126 * Returns: 127 * 0 on success or a negative error code on failure. 128 */ 129 static inline int drm_gem_dma_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) 130 { 131 struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj); 132 133 return drm_gem_dma_mmap(dma_obj, vma); 134 } 135 136 /* 137 * Driver ops 138 */ 139 140 /* create memory region for DRM framebuffer */ 141 int drm_gem_dma_dumb_create_internal(struct drm_file *file_priv, 142 struct drm_device *drm, 143 struct drm_mode_create_dumb *args); 144 145 /* create memory region for DRM framebuffer */ 146 int drm_gem_dma_dumb_create(struct drm_file *file_priv, 147 struct drm_device *drm, 148 struct drm_mode_create_dumb *args); 149 150 struct drm_gem_object * 151 drm_gem_dma_prime_import_sg_table(struct drm_device *dev, 152 struct dma_buf_attachment *attach, 153 struct sg_table *sgt); 154 155 /** 156 * DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE - DMA GEM driver operations 157 * @dumb_create_func: callback function for .dumb_create 158 * 159 * This macro provides a shortcut for setting the default GEM operations in the 160 * &drm_driver structure. 161 * 162 * This macro is a variant of DRM_GEM_DMA_DRIVER_OPS for drivers that 163 * override the default implementation of &struct rm_driver.dumb_create. Use 164 * DRM_GEM_DMA_DRIVER_OPS if possible. Drivers that require a virtual address 165 * on imported buffers should use 166 * DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE() instead. 167 */ 168 #define DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(dumb_create_func) \ 169 .dumb_create = (dumb_create_func), \ 170 .gem_prime_import_sg_table = drm_gem_dma_prime_import_sg_table 171 172 /** 173 * DRM_GEM_DMA_DRIVER_OPS - DMA GEM driver operations 174 * 175 * This macro provides a shortcut for setting the default GEM operations in the 176 * &drm_driver structure. 177 * 178 * Drivers that come with their own implementation of 179 * &struct drm_driver.dumb_create should use 180 * DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE() instead. Use 181 * DRM_GEM_DMA_DRIVER_OPS if possible. Drivers that require a virtual address 182 * on imported buffers should use DRM_GEM_DMA_DRIVER_OPS_VMAP instead. 183 */ 184 #define DRM_GEM_DMA_DRIVER_OPS \ 185 DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(drm_gem_dma_dumb_create) 186 187 /** 188 * DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE - DMA GEM driver operations 189 * ensuring a virtual address 190 * on the buffer 191 * @dumb_create_func: callback function for .dumb_create 192 * 193 * This macro provides a shortcut for setting the default GEM operations in the 194 * &drm_driver structure for drivers that need the virtual address also on 195 * imported buffers. 196 * 197 * This macro is a variant of DRM_GEM_DMA_DRIVER_OPS_VMAP for drivers that 198 * override the default implementation of &struct drm_driver.dumb_create. Use 199 * DRM_GEM_DMA_DRIVER_OPS_VMAP if possible. Drivers that do not require a 200 * virtual address on imported buffers should use 201 * DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE() instead. 202 */ 203 #define DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(dumb_create_func) \ 204 .dumb_create = (dumb_create_func), \ 205 .gem_prime_import_sg_table = drm_gem_dma_prime_import_sg_table_vmap 206 207 /** 208 * DRM_GEM_DMA_DRIVER_OPS_VMAP - DMA GEM driver operations ensuring a virtual 209 * address on the buffer 210 * 211 * This macro provides a shortcut for setting the default GEM operations in the 212 * &drm_driver structure for drivers that need the virtual address also on 213 * imported buffers. 214 * 215 * Drivers that come with their own implementation of 216 * &struct drm_driver.dumb_create should use 217 * DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE() instead. Use 218 * DRM_GEM_DMA_DRIVER_OPS_VMAP if possible. Drivers that do not require a 219 * virtual address on imported buffers should use DRM_GEM_DMA_DRIVER_OPS 220 * instead. 221 */ 222 #define DRM_GEM_DMA_DRIVER_OPS_VMAP \ 223 DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(drm_gem_dma_dumb_create) 224 225 struct drm_gem_object * 226 drm_gem_dma_prime_import_sg_table_vmap(struct drm_device *drm, 227 struct dma_buf_attachment *attach, 228 struct sg_table *sgt); 229 230 /* 231 * File ops 232 */ 233 234 #ifndef CONFIG_MMU 235 unsigned long drm_gem_dma_get_unmapped_area(struct file *filp, 236 unsigned long addr, 237 unsigned long len, 238 unsigned long pgoff, 239 unsigned long flags); 240 #define DRM_GEM_DMA_UNMAPPED_AREA_FOPS \ 241 .get_unmapped_area = drm_gem_dma_get_unmapped_area, 242 #else 243 #define DRM_GEM_DMA_UNMAPPED_AREA_FOPS 244 #endif 245 246 /** 247 * DEFINE_DRM_GEM_DMA_FOPS() - macro to generate file operations for DMA drivers 248 * @name: name for the generated structure 249 * 250 * This macro autogenerates a suitable &struct file_operations for DMA based 251 * drivers, which can be assigned to &drm_driver.fops. Note that this structure 252 * cannot be shared between drivers, because it contains a reference to the 253 * current module using THIS_MODULE. 254 * 255 * Note that the declaration is already marked as static - if you need a 256 * non-static version of this you're probably doing it wrong and will break the 257 * THIS_MODULE reference by accident. 258 */ 259 #define DEFINE_DRM_GEM_DMA_FOPS(name) \ 260 static const struct file_operations name = {\ 261 .owner = THIS_MODULE,\ 262 .open = drm_open,\ 263 .release = drm_release,\ 264 .unlocked_ioctl = drm_ioctl,\ 265 .compat_ioctl = drm_compat_ioctl,\ 266 .poll = drm_poll,\ 267 .read = drm_read,\ 268 .llseek = noop_llseek,\ 269 .mmap = drm_gem_mmap,\ 270 DRM_GEM_DMA_UNMAPPED_AREA_FOPS \ 271 } 272 273 #endif /* __DRM_GEM_DMA_HELPER_H__ */ 274