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<section id="drm-panfrost-mali-driver">
<h1>drm/Panfrost Mali Driver<a class="headerlink" href="#drm-panfrost-mali-driver" title="Link to this heading">¶</a></h1>
<section id="panfrost-drm-client-usage-stats-implementation">
<span id="panfrost-usage-stats"></span><h2>Panfrost DRM client usage stats implementation<a class="headerlink" href="#panfrost-drm-client-usage-stats-implementation" title="Link to this heading">¶</a></h2>
<p>The drm/Panfrost driver implements the DRM client usage stats specification as
documented in <a class="reference internal" href="drm-usage-stats.html#drm-client-usage-stats"><span class="std std-ref">DRM client usage stats</span></a>.</p>
<p>Example of the output showing the implemented key value pairs and entirety of
the currently possible format options:</p>
<dl class="simple">
<dt>::</dt><dd><p>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</p>
</dd>
</dl>
<p>Possible <cite>drm-engine-</cite> key names are: <cite>fragment</cite>, and <cite>vertex-tiler</cite>.
<cite>drm-curfreq-</cite> values convey the current operating frequency for that engine.</p>
<p>Users must bear in mind that engine and cycle sampling are disabled by default,
because of power saving concerns. <cite>fdinfo</cite> 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:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>echo <N> > /sys/bus/platform/drivers/panfrost/[a-f0-9]*.gpu/profiling
</pre></div>
</div>
<p>Where <cite>N</cite> is either <cite>0</cite> or <cite>1</cite>, depending on the desired enablement status.</p>
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