Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_SELFTESTS
53 tristate "Selftests for the dma-buf interfaces"
54 default n
55 depends on DMA_SHARED_BUFFER
56
57menuconfig DMABUF_HEAPS
58 bool "DMA-BUF Userland Memory Heaps"
59 select DMA_SHARED_BUFFER
60 help
61 Choose this option to enable the DMA-BUF userland memory heaps.
62 This options creates per heap chardevs in /dev/dma_heap/ which
63 allows userspace to allocate dma-bufs that can be shared
64 between drivers.
65
66source "drivers/dma-buf/heaps/Kconfig"
67
68endmenu