1What:		/sys/kernel/dmabuf/buffers
2Date:		May 2021
3KernelVersion:	v5.13
4Contact:	Hridya Valsaraju <[email protected]>
5Description:	The /sys/kernel/dmabuf/buffers directory contains a
6		snapshot of the internal state of every DMA-BUF.
7		/sys/kernel/dmabuf/buffers/<inode_number> will contain the
8		statistics for the DMA-BUF with the unique inode number
9		<inode_number>
10Users:		kernel memory tuning/debugging tools
11
12What:		/sys/kernel/dmabuf/buffers/<inode_number>/exporter_name
13Date:		May 2021
14KernelVersion:	v5.13
15Contact:	Hridya Valsaraju <[email protected]>
16Description:	This file is read-only and contains the name of the exporter of
17		the DMA-BUF.
18
19What:		/sys/kernel/dmabuf/buffers/<inode_number>/size
20Date:		May 2021
21KernelVersion:	v5.13
22Contact:	Hridya Valsaraju <[email protected]>
23Description:	This file is read-only and specifies the size of the DMA-BUF in
24		bytes.
25
26What:		/sys/kernel/dmabuf/buffers/<inode_number>/attachments
27Date:		May 2021
28KernelVersion:	v5.13
29Contact:	Hridya Valsaraju <[email protected]>
30Description:	This directory will contain subdirectories representing every
31		attachment of the DMA-BUF.
32
33What:		/sys/kernel/dmabuf/buffers/<inode_number>/attachments/<attachment_uid>
34Date:		May 2021
35KernelVersion:	v5.13
36Contact:	Hridya Valsaraju <[email protected]>
37Description:	This directory will contain information on the attached device
38		and the number of current distinct device mappings.
39
40What:		/sys/kernel/dmabuf/buffers/<inode_number>/attachments/<attachment_uid>/device
41Date:		May 2021
42KernelVersion:	v5.13
43Contact:	Hridya Valsaraju <[email protected]>
44Description:	This file is read-only and is a symlink to the attached device's
45		sysfs entry.
46
47What:		/sys/kernel/dmabuf/buffers/<inode_number>/attachments/<attachment_uid>/map_counter
48Date:		May 2021
49KernelVersion:	v5.13
50Contact:	Hridya Valsaraju <[email protected]>
51Description:	This file is read-only and contains a map_counter indicating the
52		number of distinct device mappings of the attachment.
53