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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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.