diff options
Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c')
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c index d45d2caffa5a..d59d9dd16ebc 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c @@ -323,3 +323,54 @@ void vmw_bo_pin_reserved(struct vmw_dma_buffer *vbo, bool pin) BUG_ON(ret != 0 || bo->mem.mem_type != old_mem_type); } + + +/* + * vmw_dma_buffer_unmap - Tear down a cached buffer object map. + * + * @vbo: The buffer object whose map we are tearing down. + * + * This function tears down a cached map set up using + * vmw_dma_buffer_map_and_cache(). + */ +void vmw_dma_buffer_unmap(struct vmw_dma_buffer *vbo) +{ + if (vbo->map.bo == NULL) + return; + + ttm_bo_kunmap(&vbo->map); +} + + +/* + * vmw_dma_buffer_map_and_cache - Map a buffer object and cache the map + * + * @vbo: The buffer object to map + * Return: A kernel virtual address or NULL if mapping failed. + * + * This function maps a buffer object into the kernel address space, or + * returns the virtual kernel address of an already existing map. The virtual + * address remains valid as long as the buffer object is pinned or reserved. + * The cached map is torn down on either + * 1) Buffer object move + * 2) Buffer object swapout + * 3) Buffer object destruction + * + */ +void *vmw_dma_buffer_map_and_cache(struct vmw_dma_buffer *vbo) +{ + struct ttm_buffer_object *bo = &vbo->base; + bool not_used; + void *virtual; + int ret; + + virtual = ttm_kmap_obj_virtual(&vbo->map, ¬_used); + if (virtual) + return virtual; + + ret = ttm_bo_kmap(bo, 0, bo->num_pages, &vbo->map); + if (ret) + DRM_ERROR("Buffer object map failed: %d.\n", ret); + + return ttm_kmap_obj_virtual(&vbo->map, ¬_used); +} |