trace/coresight/coresight-config.rst

1 .. SPDX-License-Identifier: GPL-2.0
14 programming of the CoreSight system with pre-defined configurations that
17 Many CoreSight components can be programmed in complex ways - especially ETMs.
30 --------
41 accesses in the driver - the resource usage and parameter descriptions
55 A parameter value is a named value that may be set by the user prior to the
64 if the user does not supply a new value.
67 system - which is described below.
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77 session where the configuration is selected. For any trace session only one
78 configuration may be selected.
82 enabled on a class of devices - i.e. any ETMv4, or specific devices, e.g. a
103 If no preset is selected, then the parameter values defined in the feature
118     perf record -e cs_etm/autofdo/ myapp
139 Mount configfs as normal and the 'cs-syscfg' subsystem will appear::
142     cs-syscfg  stp-policy
144 This has two sub-directories::
146     $ cd cs-syscfg/
214 be selected when running trace under perf::
220 The key directory here is 'events' - a generic perf directory which allows
232 The 'autofdo' configuration may be selected on the perf command line::
234     $ perf record -e cs_etm/autofdo/u --per-thread <application>
236 A preset to override the current parameter values can also be selected::
238     $ perf record -e cs_etm/autofdo,preset=1/u --per-thread <application>
240 When configurations are selected in this way, then the trace sink used is
241 automatically selected.
256 This will then use any default parameter values in the features - which can be
264 The valid values for preset are 0 - to deselect presets, and any value of
265 <n> where a preset<n> sub-directory is present.