Documentation/gpu/panfrost.rst

File Facts

System

Linux kernel

Corpus path

Documentation/gpu/panfrost.rst

Extension

.rst

Size

1771 bytes

Lines

50

Domain

Support Tooling And Documentation

Bucket

Documentation

Inferred role

Support Tooling And Documentation: documentation

Status

atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

.. SPDX-License-Identifier: GPL-2.0+

=========================
 drm/Panfrost Mali Driver
=========================

.. _panfrost-usage-stats:

Panfrost DRM client usage stats implementation
==============================================

The drm/Panfrost driver implements the DRM client usage stats specification as
documented in :ref:`drm-client-usage-stats`.

Example of the output showing the implemented key value pairs and entirety of
the currently possible format options:

::
      pos:    0
      flags:  02400002
      mnt_id: 27
      ino:    531
      drm-driver:     panfrost
      drm-client-id:  14
      drm-engine-fragment:    1846584880 ns
      drm-cycles-fragment:    1424359409
      drm-maxfreq-fragment:   799999987 Hz
      drm-curfreq-fragment:   799999987 Hz
      drm-engine-vertex-tiler:        71932239 ns
      drm-cycles-vertex-tiler:        52617357
      drm-maxfreq-vertex-tiler:       799999987 Hz
      drm-curfreq-vertex-tiler:       799999987 Hz
      drm-total-memory:       290 MiB
      drm-shared-memory:      0 MiB
      drm-active-memory:      226 MiB
      drm-resident-memory:    36496 KiB
      drm-purgeable-memory:   128 KiB

Possible `drm-engine-` key names are: `fragment`, and  `vertex-tiler`.
`drm-curfreq-` values convey the current operating frequency for that engine.

Users must bear in mind that engine and cycle sampling are disabled by default,
because of power saving concerns. `fdinfo` users and benchmark applications which
query the fdinfo file must make sure to toggle the job profiling status of the
driver by writing into the appropriate sysfs node::

    echo <N> > /sys/bus/platform/drivers/panfrost/[a-f0-9]*.gpu/profiling

Where `N` is either `0` or `1`, depending on the desired enablement status.

Annotation

• Atlas domain: Support Tooling And Documentation / Documentation.
• Implementation status: atlas-only.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.