linux-imx

menu "DMABUF options"

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config SYNC_FILE

    bool "Explicit Synchronization Framework"

    default n

    select ANON_INODES

    select DMA_SHARED_BUFFER

    ---help---

      The Sync File Framework adds explicit syncronization 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.

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      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/sync_file.txt.

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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.

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      WARNING: improper use of this can result in deadlocking kernel

      drivers from userspace. Intended for test and debug only.

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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.

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endmenu