what is the difference between xgene_hwmon and altra_hwmon?

[rootfs]

Hi

I am working on Kepler project to measure runtime workload power consumption. I have an Ampere setup running RHEL 8.4.

I can see xgene_hwmon but no altra_hwmon. What is the difference between the two when it comes to power reading? I can see CPU and IO power, but how to get DRAM power?

Thanks!

# lsmod | grep hwmon
xgene_hwmon           262144  0
# modprobe altra_hwmon
modprobe: FATAL: Module altra_hwmon not found in directory /lib/modules/4.18.0-372.9.1.el8.aarch64
# sensors
i350bb-pci-30300
Adapter: PCI adapter
loc1:         +44.0°C  (high = +120.0°C, crit = +110.0°C)

apm_xgene-isa-0000
Adapter: ISA adapter
SoC Temperature:  +35.0°C  
CPU power:        16.28 W  
IO power:         31.90 W  

[adamliyi]

Hi @rootfs ,

Please refer to: https://github.com/AmpereComputing/ampere-lts-kernel/wiki/hwmon-drivers and https://github.com/AmpereComputing/ampere-lts-kernel/wiki/5.15-kernel-patches

The altra_hwmon driver is not upstreamed, you might want to build with bellow patches:

hwmon: Add Ampere Altra HW monitor driver hwmon: (altra) restrict energy measurements to root access

If you are testing with 4.18 kernel, here is altra_hwmon driver for 4.18 kernel: https://github.com/AmpereComputing/ampere-centos-kernel/commit/f2e6dee522cc4be9dd094c30dc88273f44d5ffe2