| What: /sys/kernel/dmabuf/buffers |
| Date: January 2021 |
| KernelVersion: v5.12 |
| 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: January 2021 |
| KernelVersion: v5.12 |
| 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: January 2021 |
| KernelVersion: v5.12 |
| 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: January 2021 |
| KernelVersion: v5.12 |
| 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: January 2021 |
| KernelVersion: v5.12 |
| Contact: Hridya Valsaraju <hridya@google.com> |
| Description: This directory will contain information on the attaching device |
| and the number of current distinct device mappings. |
| |
| What: /sys/kernel/dmabuf/buffers/<inode_number>/attachments/<attachment_uid>/device |
| Date: January 2021 |
| KernelVersion: v5.12 |
| Contact: Hridya Valsaraju <hridya@google.com> |
| Description: This file is read-only and is a symlink to the attaching devices's |
| sysfs entry. |
| |
| What: /sys/kernel/dmabuf/buffers/<inode_number>/attachments/<attachment_uid>/map_counter |
| Date: January 2021 |
| KernelVersion: v5.12 |
| 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. |
| |
| What: /sys/kernel/dmabuf/buffers/<inode_number>/mmap_count |
| Date: January 2021 |
| KernelVersion: v5.10 |
| Contact: Kalesh Singh <kaleshsingh@google.com> |
| Description: This file is read-only and contains a counter indicating the |
| number of times the buffer has been mmap(). |
