include/drm/drm_gem_shmem_helper.h

   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__ */