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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/dma-buf/Kconfig
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/dma-buf/Kconfig')
-rw-r--r--drivers/dma-buf/Kconfig94
1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig
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+# 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