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stm class: Document stm_source channel assignment

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This patch adds an explanation of how and when stm_source devices are
assigned STP masters and channels.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
This commit is contained in:
Alexander Shishkin 2016-09-26 15:27:05 +03:00
parent bd56618972
commit b29f6d3e59
1 changed files with 10 additions and 0 deletions
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Documentation/trace/stm.txt
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@ -85,6 +85,16 @@ $ echo dummy_stm.0 > /sys/class/stm_source/console/stm_source_link
For examples on how to use stm_source interface in the kernel, refer
to stm_console or stm_heartbeat drivers.
Each stm_source device will need to assume a master and a range of
channels, depending on how many channels it requires. These are
allocated for the device according to the policy configuration. If
there's a node in the root of the policy directory that matches the
stm_source device's name (for example, "console"), this node will be
used to allocate master and channel numbers. If there's no such policy
node, the stm core will pick the first contiguous chunk of channels
within the first available master. Note that the node must exist
before the stm_source device is connected to its stm device.
stm_console
===========