Linux v5.2.1 - dma-buf
# SPDX-License-Identifier: GPL-2.0-only
menu "DMABUF options"
bool "Explicit Synchronization Framework"
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
bool "Sync File Validation Framework"
depends on SYNC_FILE
depends on DEBUG_FS
A sync object driver that uses a 32bit counter to coordinate
synchronization. Useful when there is no hardware primitive backing
WARNING: improper use of this can result in deadlocking kernel
drivers from userspace. Intended for test and debug only.
bool "userspace dmabuf misc driver"
depends on DMA_SHARED_BUFFER
depends on MEMFD_CREATE || COMPILE_TEST
A driver to let userspace turn memfd regions into dma-bufs.
Qemu can use this to create host dmabufs for guest framebuffers.