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CONFIG_SYNC_FILE: Explicit Synchronization Framework

General informations

The Linux kernel configuration item CONFIG_SYNC_FILE has multiple definitions:

Explicit Synchronization Framework found in drivers/dma-buf/Kconfig

The configuration item CONFIG_SYNC_FILE:

Help text

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.

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.

sync_file support for fences found in drivers/dma-buf/Kconfig

The configuration item CONFIG_SYNC_FILE:

Help text

This option enables the fence framework synchronization to export sync_files to userspace that can represent one or more fences.

Hardware

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