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
67 system - which is described below.
74 --------------
82 enabled on a class of devices - i.e. any ETMv4, or specific devices, e.g. a
118     perf record -e cs_etm/autofdo/ myapp
137 system can be viewed using the configfs API.
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/
184     parameter 'window': a number of CPU cycles (W)
220 The key directory here is 'events' - a generic perf directory which allows
234     $ perf record -e cs_etm/autofdo/u --per-thread <application>
238     $ perf record -e cs_etm/autofdo,preset=1/u --per-thread <application>
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.