97 lines
3.2 KiB
Plaintext
97 lines
3.2 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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menu "DMABUF options"
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config SYNC_FILE
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bool "Explicit Synchronization Framework"
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default n
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select DMA_SHARED_BUFFER
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help
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The Sync File Framework adds explicit synchronization via
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userspace. It enables send/receive 'struct dma_fence' objects to/from
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userspace via Sync File fds for synchronization between drivers via
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userspace components. It has been ported from Android.
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The first and main user for this is graphics in which a fence is
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associated with a buffer. When a job is submitted to the GPU a fence
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is attached to the buffer and is transferred via userspace, using Sync
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Files fds, to the DRM driver for example. More details at
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Documentation/driver-api/sync_file.rst.
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config SW_SYNC
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bool "Sync File Validation Framework"
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default n
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depends on SYNC_FILE
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depends on DEBUG_FS
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help
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A sync object driver that uses a 32bit counter to coordinate
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synchronization. Useful when there is no hardware primitive backing
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the synchronization.
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WARNING: improper use of this can result in deadlocking kernel
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drivers from userspace. Intended for test and debug only.
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config UDMABUF
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bool "userspace dmabuf misc driver"
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default n
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depends on DMA_SHARED_BUFFER
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depends on MEMFD_CREATE || COMPILE_TEST
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depends on MMU
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select VMAP_PFN
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help
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A driver to let userspace turn memfd regions into dma-bufs.
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Qemu can use this to create host dmabufs for guest framebuffers.
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config DMABUF_MOVE_NOTIFY
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bool "Move notify between drivers (EXPERIMENTAL)"
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default n
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depends on DMA_SHARED_BUFFER
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help
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Don't pin buffers if the dynamic DMA-buf interface is available on
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both the exporter as well as the importer. This fixes a security
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problem where userspace is able to pin unrestricted amounts of memory
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through DMA-buf.
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This is marked experimental because we don't yet have a consistent
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execution context and memory management between drivers.
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config DMABUF_DEBUG
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bool "DMA-BUF debug checks"
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depends on DMA_SHARED_BUFFER
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default y if DMA_API_DEBUG
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help
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This option enables additional checks for DMA-BUF importers and
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exporters. Specifically it validates that importers do not peek at the
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underlying struct page when they import a buffer.
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config DMABUF_SELFTESTS
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tristate "Selftests for the dma-buf interfaces"
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default n
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depends on DMA_SHARED_BUFFER
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menuconfig DMABUF_HEAPS
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bool "DMA-BUF Userland Memory Heaps"
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select DMA_SHARED_BUFFER
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help
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Choose this option to enable the DMA-BUF userland memory heaps.
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This options creates per heap chardevs in /dev/dma_heap/ which
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allows userspace to allocate dma-bufs that can be shared
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between drivers.
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menuconfig DMABUF_SYSFS_STATS
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bool "DMA-BUF sysfs statistics (DEPRECATED)"
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depends on DMA_SHARED_BUFFER
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help
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Choose this option to enable DMA-BUF sysfs statistics
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in location /sys/kernel/dmabuf/buffers.
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/sys/kernel/dmabuf/buffers/<inode_number> will contain
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statistics for the DMA-BUF with the unique inode number
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<inode_number>.
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This option is deprecated and should sooner or later be removed.
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Android is the only user of this and it turned out that this resulted
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in quite some performance problems.
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source "drivers/dma-buf/heaps/Kconfig"
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endmenu
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