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Zhang Rui bf44b9011d powercap: intel_rapl: Make cpu optional for rapl_package

MSR RAPL Interface always removes a rapl_package when all the CPUs in
that rapl_package are offlined. This is because it relies on an online
CPU to access the MSR.

But for RAPL Interface using MMIO registers, when all the cpus within
the rapl_package are offlined,
1. the register can still be accessed
2. monitoring and setting the Power Pimits for the rapl_package is still
   meaningful because of uncore power.

This means that, a valid rapl_package doesn't rely on one or more cpus
being onlined.

For this sense, make cpu optional for rapl_package. A rapl_package can
be registered either using a CPU id to represent the physical
package/die, or using the physical package id directly.

Note that, the thermal throttling interrupt is not disabled via
MSR_IA32_PACKAGE_THERM_INTERRUPT for such rapl_package at the moment.
If it is still needed in the future, this can be achieved by selecting
an onlined CPU using the physical package id.

Note that, processor_thermal_rapl, the current MMIO RAPL Interface
driver, can also be converted to register using a package id instead.
But this is not done right now because processor_thermal_rapl driver
works on single-package systems only, and offlining the only package
will not happen. So keep the previous logic.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Wang Wendy <wendy.wang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

2023-05-24 18:46:20 +02:00

arm_scmi_powercap.c

powercap: arm_scmi: Add SCMI Powercap based driver

2022-10-25 18:53:15 +02:00

dtpm_cpu.c

Power management updates for 5.20-rc1

2022-08-02 11:17:00 -07:00

dtpm_devfreq.c

powercap/drivers/dtpm: Add dtpm devfreq with energy model support

2022-02-04 17:38:09 +01:00

dtpm_subsys.h

powercap/drivers/dtpm: Add dtpm devfreq with energy model support