# 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
  	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_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.

  source "drivers/dma-buf/heaps/Kconfig"

  endmenu