| # SPDX-License-Identifier: GPL-2.0-only |
| menu "DMABUF options" |
| |
| config SYNC_FILE |
| bool "Explicit Synchronization Framework" |
| default n |
| select DMA_SHARED_BUFFER |
| ---help--- |
| The Sync File Framework adds explicit syncronization via |
| userspace. It enables send/receive 'struct dma_fence' objects to/from |
| userspace via Sync File fds for synchronization between drivers via |
| userspace components. It has been ported from Android. |
| |
| The first and main user for this is graphics in which a fence is |
| associated with a buffer. When a job is submitted to the GPU a fence |
| is attached to the buffer and is transferred via userspace, using Sync |
| Files fds, to the DRM driver for example. More details at |
| Documentation/sync_file.txt. |
| |
| config SW_SYNC |
| bool "Sync File Validation Framework" |
| default n |
| depends on SYNC_FILE |
| depends on DEBUG_FS |
| ---help--- |
| A sync object driver that uses a 32bit counter to coordinate |
| synchronization. Useful when there is no hardware primitive backing |
| the synchronization. |
| |
| WARNING: improper use of this can result in deadlocking kernel |
| drivers from userspace. Intended for test and debug only. |
| |
| config UDMABUF |
| bool "userspace dmabuf misc driver" |
| default n |
| depends on DMA_SHARED_BUFFER |
| depends on MEMFD_CREATE || COMPILE_TEST |
| help |
| A driver to let userspace turn memfd regions into dma-bufs. |
| Qemu can use this to create host dmabufs for guest framebuffers. |
| |
| endmenu |
