e0a9f1fe20
Add a warning that this UAPI wasn't such a good idea and shouldn't be used by anybody. That should give us a better chance to remove it at some point and prevents others from running into the same issues. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: T.J. Mercier <tjmercier@google.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220617085702.4298-1-christian.koenig@amd.com
95 lines
3.2 KiB
Plaintext
95 lines
3.2 KiB
Plaintext
# 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
|
|
depends on DMA_SHARED_BUFFER
|
|
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_DEBUG
|
|
bool "DMA-BUF debug checks"
|
|
depends on DMA_SHARED_BUFFER
|
|
default y if DMA_API_DEBUG
|
|
help
|
|
This option enables additional checks for DMA-BUF importers and
|
|
exporters. Specifically it validates that importers do not peek at the
|
|
underlying struct page when they import a buffer.
|
|
|
|
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.
|
|
|
|
menuconfig DMABUF_SYSFS_STATS
|
|
bool "DMA-BUF sysfs statistics (DEPRECATED)"
|
|
depends on DMA_SHARED_BUFFER
|
|
help
|
|
Choose this option to enable DMA-BUF sysfs statistics
|
|
in location /sys/kernel/dmabuf/buffers.
|
|
|
|
/sys/kernel/dmabuf/buffers/<inode_number> will contain
|
|
statistics for the DMA-BUF with the unique inode number
|
|
<inode_number>.
|
|
|
|
This option is deprecated and should sooner or later be removed.
|
|
Android is the only user of this and it turned out that this resulted
|
|
in quite some performance problems.
|
|
|
|
source "drivers/dma-buf/heaps/Kconfig"
|
|
|
|
endmenu
|