forked from luck/tmp_suning_uos_patched
drm/gem: add functions for mmap offset creation
Signed-off-by: Rob Clark <rob@ti.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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parent
302a8e8b06
commit
75ef8b3b9c
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@ -285,6 +285,94 @@ drm_gem_handle_create(struct drm_file *file_priv,
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}
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EXPORT_SYMBOL(drm_gem_handle_create);
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/**
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* drm_gem_free_mmap_offset - release a fake mmap offset for an object
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* @obj: obj in question
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*
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* This routine frees fake offsets allocated by drm_gem_create_mmap_offset().
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*/
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void
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drm_gem_free_mmap_offset(struct drm_gem_object *obj)
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{
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struct drm_device *dev = obj->dev;
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struct drm_gem_mm *mm = dev->mm_private;
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struct drm_map_list *list = &obj->map_list;
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drm_ht_remove_item(&mm->offset_hash, &list->hash);
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drm_mm_put_block(list->file_offset_node);
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kfree(list->map);
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list->map = NULL;
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}
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EXPORT_SYMBOL(drm_gem_free_mmap_offset);
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/**
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* drm_gem_create_mmap_offset - create a fake mmap offset for an object
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* @obj: obj in question
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*
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* GEM memory mapping works by handing back to userspace a fake mmap offset
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* it can use in a subsequent mmap(2) call. The DRM core code then looks
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* up the object based on the offset and sets up the various memory mapping
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* structures.
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*
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* This routine allocates and attaches a fake offset for @obj.
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*/
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int
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drm_gem_create_mmap_offset(struct drm_gem_object *obj)
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{
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struct drm_device *dev = obj->dev;
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struct drm_gem_mm *mm = dev->mm_private;
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struct drm_map_list *list;
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struct drm_local_map *map;
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int ret = 0;
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/* Set the object up for mmap'ing */
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list = &obj->map_list;
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list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
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if (!list->map)
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return -ENOMEM;
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map = list->map;
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map->type = _DRM_GEM;
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map->size = obj->size;
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map->handle = obj;
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/* Get a DRM GEM mmap offset allocated... */
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list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
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obj->size / PAGE_SIZE, 0, 0);
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if (!list->file_offset_node) {
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DRM_ERROR("failed to allocate offset for bo %d\n", obj->name);
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ret = -ENOSPC;
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goto out_free_list;
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}
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list->file_offset_node = drm_mm_get_block(list->file_offset_node,
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obj->size / PAGE_SIZE, 0);
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if (!list->file_offset_node) {
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ret = -ENOMEM;
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goto out_free_list;
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}
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list->hash.key = list->file_offset_node->start;
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ret = drm_ht_insert_item(&mm->offset_hash, &list->hash);
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if (ret) {
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DRM_ERROR("failed to add to map hash\n");
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goto out_free_mm;
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}
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return 0;
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out_free_mm:
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drm_mm_put_block(list->file_offset_node);
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out_free_list:
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kfree(list->map);
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list->map = NULL;
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return ret;
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}
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EXPORT_SYMBOL(drm_gem_create_mmap_offset);
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/** Returns a reference to the object named by the handle. */
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struct drm_gem_object *
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drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp,
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@ -1624,6 +1624,9 @@ drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
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drm_gem_object_unreference_unlocked(obj);
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}
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void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
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int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
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struct drm_gem_object *drm_gem_object_lookup(struct drm_device *dev,
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struct drm_file *filp,
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u32 handle);
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