When the backing store buffer is evicted, Issue a readback from the resources and notify the resources that they are no longer bound to a valid backing store.
Signed-off-by: Thomas Hellstrom thellstrom@vmware.com Reviewed-by: Brian Paul brianp@vmware.com Reviewed-by: Zack Rusin zackr@vmware.com --- drivers/gpu/drm/vmwgfx/vmwgfx_resource.c | 45 +++++++++++++++++++++++++++++++- 1 file changed, 44 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c index 1a62eed..6cd1560 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c @@ -1293,11 +1293,54 @@ void vmw_fence_single_bo(struct ttm_buffer_object *bo, * @mem: The truct ttm_mem_reg indicating to what memory * region the move is taking place. * - * For now does nothing. + * Evicts the Guest Backed hardware resource if the backup + * buffer is being moved out of MOB memory. + * Note that this function should not race with the resource + * validation code as long as it accesses only members of struct + * resource that remain static while bo::res is !NULL and + * while we have @bo reserved. struct resource::backup is *not* a + * static member. The resource validation code will take care + * to set @bo::res to NULL, while having @bo reserved when the + * buffer is no longer bound to the resource, so @bo:res can be + * used to determine whether there is a need to unbind and whether + * it is safe to unbind. */ void vmw_resource_move_notify(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem) { + struct vmw_dma_buffer *dma_buf; + + if (mem == NULL) + return; + + if (bo->destroy != vmw_dmabuf_bo_free && + bo->destroy != vmw_user_dmabuf_destroy) + return; + + dma_buf = container_of(bo, struct vmw_dma_buffer, base); + + if (mem->mem_type != VMW_PL_MOB) { + struct vmw_resource *res, *n; + struct ttm_bo_device *bdev = bo->bdev; + struct ttm_validate_buffer val_buf; + + val_buf.bo = bo; + + list_for_each_entry_safe(res, n, &dma_buf->res_list, mob_head) { + + if (unlikely(res->func->unbind == NULL)) + continue; + + (void) res->func->unbind(res, true, &val_buf); + res->backup_dirty = true; + res->res_dirty = false; + list_del_init(&res->mob_head); + } + + spin_lock(&bdev->fence_lock); + (void) ttm_bo_wait(bo, false, false, false); + spin_unlock(&bdev->fence_lock); + } }
/**