| # 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 synchronization 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/driver-api/sync_file.rst. | |
| 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. | |
| config DMABUF_MOVE_NOTIFY | |
| bool "Move notify between drivers (EXPERIMENTAL)" | |
| default n | |
| help | |
| Don't pin buffers if the dynamic DMA-buf interface is available on | |
| both the exporter as well as the importer. This fixes a security | |
| problem where userspace is able to pin unrestricted amounts of memory | |
| through DMA-buf. | |
| This is marked experimental because we don't yet have a consistent | |
| execution context and memory management between drivers. | |
| config DMABUF_SELFTESTS | |
| tristate "Selftests for the dma-buf interfaces" | |
| default n | |
| depends on DMA_SHARED_BUFFER | |
| menuconfig DMABUF_HEAPS | |
| bool "DMA-BUF Userland Memory Heaps" | |
| select DMA_SHARED_BUFFER | |
| help | |
| Choose this option to enable the DMA-BUF userland memory heaps. | |
| This options creates per heap chardevs in /dev/dma_heap/ which | |
| allows userspace to allocate dma-bufs that can be shared | |
| between drivers. | |
| source "drivers/dma-buf/heaps/Kconfig" | |
| endmenu |