Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
18 lines
987 B
ReStructuredText
18 lines
987 B
ReStructuredText
====================================
|
|
Arm Network-on Chip Interconnect PMU
|
|
====================================
|
|
|
|
NI-700 and friends implement a distinct PMU for each clock domain within the
|
|
interconnect. Correspondingly, the driver exposes multiple PMU devices named
|
|
arm_ni_<x>_cd_<y>, where <x> is an (arbitrary) instance identifier and <y> is
|
|
the clock domain ID within that particular instance. If multiple NI instances
|
|
exist within a system, the PMU devices can be correlated with the underlying
|
|
hardware instance via sysfs parentage.
|
|
|
|
Each PMU exposes base event aliases for the interface types present in its clock
|
|
domain. These require qualifying with the "eventid" and "nodeid" parameters
|
|
to specify the event code to count and the interface at which to count it
|
|
(per the configured hardware ID as reflected in the xxNI_NODE_INFO register).
|
|
The exception is the "cycles" alias for the PMU cycle counter, which is encoded
|
|
with the PMU node type and needs no further qualification.
|