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What: /sys/kernel/dmabuf/buffers
Date: May 2021
KernelVersion: v5.13
Contact: Hridya Valsaraju <hridya@google.com>
Description: The /sys/kernel/dmabuf/buffers directory contains a
snapshot of the internal state of every DMA-BUF.
/sys/kernel/dmabuf/buffers/<inode_number> will contain the
statistics for the DMA-BUF with the unique inode number
<inode_number>
Users: kernel memory tuning/debugging tools
What: /sys/kernel/dmabuf/buffers/<inode_number>/exporter_name
Date: May 2021
KernelVersion: v5.13
Contact: Hridya Valsaraju <hridya@google.com>
Description: This file is read-only and contains the name of the exporter of
the DMA-BUF.
What: /sys/kernel/dmabuf/buffers/<inode_number>/size
Date: May 2021
KernelVersion: v5.13
Contact: Hridya Valsaraju <hridya@google.com>
Description: This file is read-only and specifies the size of the DMA-BUF in
bytes.
What: /sys/kernel/dmabuf/buffers/<inode_number>/attachments
Date: May 2021
KernelVersion: v5.13
Contact: Hridya Valsaraju <hridya@google.com>
Description: This directory will contain subdirectories representing every
attachment of the DMA-BUF.
What: /sys/kernel/dmabuf/buffers/<inode_number>/attachments/<attachment_uid>
Date: May 2021
KernelVersion: v5.13
Contact: Hridya Valsaraju <hridya@google.com>
Description: This directory will contain information on the attached device
and the number of current distinct device mappings.
What: /sys/kernel/dmabuf/buffers/<inode_number>/attachments/<attachment_uid>/device
Date: May 2021
KernelVersion: v5.13
Contact: Hridya Valsaraju <hridya@google.com>
Description: This file is read-only and is a symlink to the attached device's
sysfs entry.
What: /sys/kernel/dmabuf/buffers/<inode_number>/attachments/<attachment_uid>/map_counter
Date: May 2021
KernelVersion: v5.13
Contact: Hridya Valsaraju <hridya@google.com>
Description: This file is read-only and contains a map_counter indicating the
number of distinct device mappings of the attachment.
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