1# SPDX-License-Identifier: GPL-2.0-only 2menu "DMABUF options" 3 4config SYNC_FILE 5 bool "Explicit Synchronization Framework" 6 default n 7 select DMA_SHARED_BUFFER 8 help 9 The Sync File Framework adds explicit synchronization via 10 userspace. It enables send/receive 'struct dma_fence' objects to/from 11 userspace via Sync File fds for synchronization between drivers via 12 userspace components. It has been ported from Android. 13 14 The first and main user for this is graphics in which a fence is 15 associated with a buffer. When a job is submitted to the GPU a fence 16 is attached to the buffer and is transferred via userspace, using Sync 17 Files fds, to the DRM driver for example. More details at 18 Documentation/driver-api/sync_file.rst. 19 20config SW_SYNC 21 bool "Sync File Validation Framework" 22 default n 23 depends on SYNC_FILE 24 depends on DEBUG_FS 25 help 26 A sync object driver that uses a 32bit counter to coordinate 27 synchronization. Useful when there is no hardware primitive backing 28 the synchronization. 29 30 WARNING: improper use of this can result in deadlocking kernel 31 drivers from userspace. Intended for test and debug only. 32 33config UDMABUF 34 bool "userspace dmabuf misc driver" 35 default n 36 depends on DMA_SHARED_BUFFER 37 depends on MEMFD_CREATE || COMPILE_TEST 38 depends on MMU 39 help 40 A driver to let userspace turn memfd regions into dma-bufs. 41 Qemu can use this to create host dmabufs for guest framebuffers. 42 43config DMABUF_DEBUG 44 bool "DMA-BUF debug checks" 45 depends on DMA_SHARED_BUFFER 46 default y if DEBUG 47 help 48 This option enables additional checks for DMA-BUF importers and 49 exporters. Specifically it validates that importers do not peek at the 50 underlying struct page when they import a buffer. 51 52config DMABUF_KUNIT_TEST 53 tristate "KUnit tests for DMA-BUF" if !KUNIT_ALL_TESTS 54 depends on KUNIT 55 select DMA_SHARED_BUFFER 56 default KUNIT_ALL_TESTS 57 help 58 Enable kunit tests for DMA-BUF 59 60menuconfig DMABUF_HEAPS 61 bool "DMA-BUF Userland Memory Heaps" 62 select DMA_SHARED_BUFFER 63 help 64 Choose this option to enable the DMA-BUF userland memory heaps. 65 This options creates per heap chardevs in /dev/dma_heap/ which 66 allows userspace to allocate dma-bufs that can be shared 67 between drivers. 68 69source "drivers/dma-buf/heaps/Kconfig" 70 71endmenu 72