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_cached: map object cached (instead of using writecombine). 102 */ 103 bool map_cached; 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_object(struct drm_gem_object *obj); 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_object *obj); 115 void drm_gem_shmem_unpin(struct drm_gem_object *obj); 116 void *drm_gem_shmem_vmap(struct drm_gem_object *obj); 117 void drm_gem_shmem_vunmap(struct drm_gem_object *obj, void *vaddr); 118 119 int drm_gem_shmem_madvise(struct drm_gem_object *obj, int madv); 120 121 static inline bool drm_gem_shmem_is_purgeable(struct drm_gem_shmem_object *shmem) 122 { 123 return (shmem->madv > 0) && 124 !shmem->vmap_use_count && shmem->sgt && 125 !shmem->base.dma_buf && !shmem->base.import_attach; 126 } 127 128 void drm_gem_shmem_purge_locked(struct drm_gem_object *obj); 129 bool drm_gem_shmem_purge(struct drm_gem_object *obj); 130 131 struct drm_gem_shmem_object * 132 drm_gem_shmem_create_with_handle(struct drm_file *file_priv, 133 struct drm_device *dev, size_t size, 134 uint32_t *handle); 135 int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev, 136 struct drm_mode_create_dumb *args); 137 138 int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma); 139 140 void drm_gem_shmem_print_info(struct drm_printer *p, unsigned int indent, 141 const struct drm_gem_object *obj); 142 143 struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_object *obj); 144 struct drm_gem_object * 145 drm_gem_shmem_prime_import_sg_table(struct drm_device *dev, 146 struct dma_buf_attachment *attach, 147 struct sg_table *sgt); 148 149 struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_object *obj); 150 151 /** 152 * DRM_GEM_SHMEM_DRIVER_OPS - Default shmem GEM operations 153 * 154 * This macro provides a shortcut for setting the shmem GEM operations in 155 * the &drm_driver structure. 156 */ 157 #define DRM_GEM_SHMEM_DRIVER_OPS \ 158 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, \ 159 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, \ 160 .gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table, \ 161 .gem_prime_mmap = drm_gem_prime_mmap, \ 162 .dumb_create = drm_gem_shmem_dumb_create 163 164 #endif /* __DRM_GEM_SHMEM_HELPER_H__ */ 165