1 /* SPDX-License-Identifier: GPL-2.0 */
3 #ifndef __DRM_GEM_SHMEM_HELPER_H__
4 #define __DRM_GEM_SHMEM_HELPER_H__
8 #include <linux/mutex.h>
10 #include <drm/drm_file.h>
11 #include <drm/drm_gem.h>
12 #include <drm/drm_ioctl.h>
13 #include <drm/drm_prime.h>
15 struct dma_buf_attachment;
16 struct drm_mode_create_dumb;
21 * struct drm_gem_shmem_object - GEM object backed by shmem
23 struct drm_gem_shmem_object {
25 * @base: Base GEM object
27 struct drm_gem_object base;
30 * @pages_lock: Protects the page table and use count
32 struct mutex pages_lock;
42 * Reference count on the pages table.
43 * The pages are put when the count reaches zero.
45 unsigned int pages_use_count;
48 * @madv: State for madvise
51 * A negative value is the object is purged.
52 * Positive values are driver specific and not used by the helpers.
57 * @madv_list: List entry for madvise tracking
59 * Typically used by drivers to track purgeable objects
61 struct list_head madv_list;
64 * @sgt: Scatter/gather table for imported PRIME buffers
69 * @vmap_lock: Protects the vmap address and use count
71 struct mutex vmap_lock;
74 * @vaddr: Kernel virtual address of the backing memory
81 * Reference count on the virtual address.
82 * The address are un-mapped when the count reaches zero.
84 unsigned int vmap_use_count;
87 * @pages_mark_dirty_on_put:
89 * Mark pages as dirty when they are put.
91 bool pages_mark_dirty_on_put : 1;
94 * @pages_mark_accessed_on_put:
96 * Mark pages as accessed when they are put.
98 bool pages_mark_accessed_on_put : 1;
101 * @map_wc: map object write-combined (instead of using shmem defaults).
106 #define to_drm_gem_shmem_obj(obj) \
107 container_of(obj, struct drm_gem_shmem_object, base)
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);
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,
117 struct iosys_map *map);
118 void drm_gem_shmem_vunmap(struct drm_gem_shmem_object *shmem,
119 struct iosys_map *map);
120 int drm_gem_shmem_mmap(struct drm_gem_shmem_object *shmem, struct vm_area_struct *vma);
122 int drm_gem_shmem_madvise(struct drm_gem_shmem_object *shmem, int madv);
124 static inline bool drm_gem_shmem_is_purgeable(struct drm_gem_shmem_object *shmem)
126 return (shmem->madv > 0) &&
127 !shmem->vmap_use_count && shmem->sgt &&
128 !shmem->base.dma_buf && !shmem->base.import_attach;
131 void drm_gem_shmem_purge_locked(struct drm_gem_shmem_object *shmem);
132 bool drm_gem_shmem_purge(struct drm_gem_shmem_object *shmem);
134 struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_shmem_object *shmem);
135 struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_shmem_object *shmem);
137 void drm_gem_shmem_print_info(const struct drm_gem_shmem_object *shmem,
138 struct drm_printer *p, unsigned int indent);
140 extern const struct vm_operations_struct drm_gem_shmem_vm_ops;
143 * GEM object functions
147 * drm_gem_shmem_object_free - GEM object function for drm_gem_shmem_free()
148 * @obj: GEM object to free
150 * This function wraps drm_gem_shmem_free(). Drivers that employ the shmem helpers
151 * should use it as their &drm_gem_object_funcs.free handler.
153 static inline void drm_gem_shmem_object_free(struct drm_gem_object *obj)
155 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
157 drm_gem_shmem_free(shmem);
161 * drm_gem_shmem_object_print_info() - Print &drm_gem_shmem_object info for debugfs
163 * @indent: Tab indentation level
166 * This function wraps drm_gem_shmem_print_info(). Drivers that employ the shmem helpers should
167 * use this function as their &drm_gem_object_funcs.print_info handler.
169 static inline void drm_gem_shmem_object_print_info(struct drm_printer *p, unsigned int indent,
170 const struct drm_gem_object *obj)
172 const struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
174 drm_gem_shmem_print_info(shmem, p, indent);
178 * drm_gem_shmem_object_pin - GEM object function for drm_gem_shmem_pin()
181 * This function wraps drm_gem_shmem_pin(). Drivers that employ the shmem helpers should
182 * use it as their &drm_gem_object_funcs.pin handler.
184 static inline int drm_gem_shmem_object_pin(struct drm_gem_object *obj)
186 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
188 return drm_gem_shmem_pin(shmem);
192 * drm_gem_shmem_object_unpin - GEM object function for drm_gem_shmem_unpin()
195 * This function wraps drm_gem_shmem_unpin(). Drivers that employ the shmem helpers should
196 * use it as their &drm_gem_object_funcs.unpin handler.
198 static inline void drm_gem_shmem_object_unpin(struct drm_gem_object *obj)
200 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
202 drm_gem_shmem_unpin(shmem);
206 * drm_gem_shmem_object_get_sg_table - GEM object function for drm_gem_shmem_get_sg_table()
209 * This function wraps drm_gem_shmem_get_sg_table(). Drivers that employ the shmem helpers should
210 * use it as their &drm_gem_object_funcs.get_sg_table handler.
213 * A pointer to the scatter/gather table of pinned pages or error pointer on failure.
215 static inline struct sg_table *drm_gem_shmem_object_get_sg_table(struct drm_gem_object *obj)
217 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
219 return drm_gem_shmem_get_sg_table(shmem);
223 * drm_gem_shmem_object_vmap - GEM object function for drm_gem_shmem_vmap()
225 * @map: Returns the kernel virtual address of the SHMEM GEM object's backing store.
227 * This function wraps drm_gem_shmem_vmap(). Drivers that employ the shmem helpers should
228 * use it as their &drm_gem_object_funcs.vmap handler.
231 * 0 on success or a negative error code on failure.
233 static inline int drm_gem_shmem_object_vmap(struct drm_gem_object *obj,
234 struct iosys_map *map)
236 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
238 return drm_gem_shmem_vmap(shmem, map);
242 * drm_gem_shmem_object_vunmap - GEM object function for drm_gem_shmem_vunmap()
244 * @map: Kernel virtual address where the SHMEM GEM object was mapped
246 * This function wraps drm_gem_shmem_vunmap(). Drivers that employ the shmem helpers should
247 * use it as their &drm_gem_object_funcs.vunmap handler.
249 static inline void drm_gem_shmem_object_vunmap(struct drm_gem_object *obj,
250 struct iosys_map *map)
252 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
254 drm_gem_shmem_vunmap(shmem, map);
258 * drm_gem_shmem_object_mmap - GEM object function for drm_gem_shmem_mmap()
260 * @vma: VMA for the area to be mapped
262 * This function wraps drm_gem_shmem_mmap(). Drivers that employ the shmem helpers should
263 * use it as their &drm_gem_object_funcs.mmap handler.
266 * 0 on success or a negative error code on failure.
268 static inline int drm_gem_shmem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
270 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
272 return drm_gem_shmem_mmap(shmem, vma);
279 struct drm_gem_object *
280 drm_gem_shmem_prime_import_sg_table(struct drm_device *dev,
281 struct dma_buf_attachment *attach,
282 struct sg_table *sgt);
283 int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
284 struct drm_mode_create_dumb *args);
287 * DRM_GEM_SHMEM_DRIVER_OPS - Default shmem GEM operations
289 * This macro provides a shortcut for setting the shmem GEM operations in
290 * the &drm_driver structure.
292 #define DRM_GEM_SHMEM_DRIVER_OPS \
293 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, \
294 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, \
295 .gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table, \
296 .gem_prime_mmap = drm_gem_prime_mmap, \
297 .dumb_create = drm_gem_shmem_dumb_create
299 #endif /* __DRM_GEM_SHMEM_HELPER_H__ */