47 lines
1.5 KiB
ReStructuredText
47 lines
1.5 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0+
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=========================
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drm/Panthor CSF driver
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=========================
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.. _panthor-usage-stats:
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Panthor DRM client usage stats implementation
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==============================================
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The drm/Panthor driver implements the DRM client usage stats specification as
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documented in :ref:`drm-client-usage-stats`.
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Example of the output showing the implemented key value pairs and entirety of
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the currently possible format options:
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::
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pos: 0
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flags: 02400002
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mnt_id: 29
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ino: 491
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drm-driver: panthor
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drm-client-id: 10
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drm-engine-panthor: 111110952750 ns
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drm-cycles-panthor: 94439687187
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drm-maxfreq-panthor: 1000000000 Hz
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drm-curfreq-panthor: 1000000000 Hz
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drm-total-memory: 16480 KiB
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drm-shared-memory: 0
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drm-active-memory: 16200 KiB
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drm-resident-memory: 16480 KiB
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drm-purgeable-memory: 0
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Possible `drm-engine-` key names are: `panthor`.
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`drm-curfreq-` values convey the current operating frequency for that engine.
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Users must bear in mind that engine and cycle sampling are disabled by default,
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because of power saving concerns. `fdinfo` users and benchmark applications which
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query the fdinfo file must make sure to toggle the job profiling status of the
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driver by writing into the appropriate sysfs node::
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echo <N> > /sys/bus/platform/drivers/panthor/[a-f0-9]*.gpu/profiling
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Where `N` is a bit mask where cycle and timestamp sampling are respectively
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enabled by the first and second bits.
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