1.. SPDX-License-Identifier: GPL-2.0+ 2 3========================= 4 drm/Panfrost Mali Driver 5========================= 6 7.. _panfrost-usage-stats: 8 9Panfrost DRM client usage stats implementation 10============================================== 11 12The drm/Panfrost driver implements the DRM client usage stats specification as 13documented in :ref:`drm-client-usage-stats`. 14 15Example of the output showing the implemented key value pairs and entirety of 16the currently possible format options: 17 18:: 19 pos: 0 20 flags: 02400002 21 mnt_id: 27 22 ino: 531 23 drm-driver: panfrost 24 drm-client-id: 14 25 drm-engine-fragment: 1846584880 ns 26 drm-cycles-fragment: 1424359409 27 drm-maxfreq-fragment: 799999987 Hz 28 drm-curfreq-fragment: 799999987 Hz 29 drm-engine-vertex-tiler: 71932239 ns 30 drm-cycles-vertex-tiler: 52617357 31 drm-maxfreq-vertex-tiler: 799999987 Hz 32 drm-curfreq-vertex-tiler: 799999987 Hz 33 drm-total-memory: 290 MiB 34 drm-shared-memory: 0 MiB 35 drm-active-memory: 226 MiB 36 drm-resident-memory: 36496 KiB 37 drm-purgeable-memory: 128 KiB 38 39Possible `drm-engine-` key names are: `fragment`, and `vertex-tiler`. 40`drm-curfreq-` values convey the current operating frequency for that engine. 41 42Users must bear in mind that engine and cycle sampling are disabled by default, 43because of power saving concerns. `fdinfo` users and benchmark applications which 44query the fdinfo file must make sure to toggle the job profiling status of the 45driver by writing into the appropriate sysfs node:: 46 47 echo <N> > /sys/bus/platform/drivers/panfrost/[a-f0-9]*.gpu/profiling 48 49Where `N` is either `0` or `1`, depending on the desired enablement status. 50