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Merged
deb-intel merged 4 commits into from
Oct 27, 2020
Merged

Logger filtering extra info #299

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8018939
logger: filtering: Add note about verbose firmware build
ktrzcinx Oct 20, 2020
e8d3b38
logger: filter: Warn about power gating and filter reset
ktrzcinx Oct 20, 2020
3ace099
logger: filter: Add note that already sent traces won't be filtered.
ktrzcinx Oct 20, 2020
d68fe27
logerer: filter: Describe filters behavior for multiple logger runs
ktrzcinx Oct 22, 2020
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28 changes: 28 additions & 0 deletions developer_guides/debugability/logger/index.rst
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Expand Up @@ -190,6 +190,34 @@ A similar example may be prepared for components on a particular pipeline:

sof-loggerr -l ldc_file -t -Fc=* -Fv=*1.*

.. note::
To track verbose message use firmware build with selected "Trace verbose"
option under "Trace" menu.

Active trace filters are stored in firmware runtime memory, so after firmware
restart (eg. after power gating in sleep mode) filters settings will be reset.
Consider disabling power gating during your debug session.
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lgirdwood marked this conversation as resolved.
It may be done by:

.. code:: bash

sudo su
echo on >/sys/devices/pci0000\:00/0000\:$(lspci -nn | grep "audio contoller" | awk '{print $1;}')/power/control

.. note::
Current device power status may be read by this command:

.. code:: bash

cat /sys/devices/pci0000\:00/0000\:$(lspci -nn | grep "audio controller" | awk '{print $1;}')/power/runtime_status

Logger trace filtration affect only traces sent after filter setup, so traces
already stored on kernel side will not be affected.

Filters are setup incrementally, so when logger will be run-up twice with
different settings, then filters from first run will not be restored to default
state but can be replaced by new one.
To reset filters to default state, firmware reset is needed.

Detailed description
--------------------
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