pchtherm(4) FreeBSD Kernel Interfaces Manual pchtherm(4)
NAME
pchtherm - Intel PCH thermal subsystem
SYNOPSIS
device pci
device pchtherm
DESCRIPTION
The pchtherm driver provides access to sensor data and configuration
installed in Intel PCH chipset. pchtherm configuration register.
The access to pchtherm data is made via the sysctl(8) interface:
dev.pchtherm.0.ctt: 115.0C
dev.pchtherm.0.temperature: 28.5C
dev.pchtherm.0.t2temp: 91.0C
dev.pchtherm.0.t1temp: 86.0C
dev.pchtherm.0.t0temp: 81.0C
dev.pchtherm.0.tahv: 83.0C
dev.pchtherm.0.talv: 30.0C
dev.pchtherm.0.pmtime: 32
dev.pchtherm.0.pmtemp: 50.0C
dev.pchtherm.0.%parent: pci0
dev.pchtherm.0.%pnpinfo: vendor=0x8086 device=0x9d31 subvendor=0x17aa subdevice=0x2256 class=0x118000
dev.pchtherm.0.%location: slot=20 function=2 dbsf=pci0:0:20:2
dev.pchtherm.0.%driver: pchtherm
dev.pchtherm.0.%desc: Skylake PCH Thermal Subsystem
dev.pchtherm.%parent:
dev.pchtherm.%d.temperature Is the read-only value of the current
temperature read by the sensor.
dev.pchtherm.%d.ctt When the system reaches this temperature,
it will shut down. This will not appear
when this feature is disabled and locked
down.
dev.pchtherm.%d.t0temp When temperature is under this value,
system will be in T0 state.
dev.pchtherm.%d.t1temp When temperature is over t0temp and under
this value, system will be in T1 state.
dev.pchtherm.%d.t2temp When temperature is over t1temp and under
this value, system will be in T2 state.
Over this value, system will be in T3
state.
dev.pchtherm.%d.talv Lower alart value. This will not appear
when sensor enable bit is locked down and
the value is zero(which will show -50.0C).
dev.pchtherm.%d.tahv High alart value. This will not appear
when sensor enable bit is locked down and
the value is zero(which will show -50.0C).
dev.pchtherm.%d.pmtemp Sensor Power management temperature.
Under this temperature, sensor will idle
during pmtime second.
dev.pchtherm.%d.pmtime Sensor idle duration when low temperature.
dev.pchtherm.%d.pch_hot_level When temperature is higher than this
value, PCHHOT# pin will assert. This
value is not appear when this feature is
disabled and locked down.
Please check the PCH datasheets for more details.
CAVEATS
All values are read-only. And it do not support event interrupt for now.
SEE ALSO
sysctl(8)
HISTORY
The pchtherm driver first appeared in FreeBSD 13.0.
AUTHORS
The pchtherm driver and this manual page were written by Takanori
Watanabe <
[email protected]>.
FreeBSD 14.1-RELEASE-p8 March 15, 2020 FreeBSD 14.1-RELEASE-p8