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The scope of uncore control is per power domain with TPMI. There are two types of processor topologies can be presented by CPUID extended topology leaf irrespective of the hardware architecture: 1. A die is not enumerated in CPUID. In this case there is only one die in a package is visible. In this case there can be multiple power domains in a single die. 2. A power domain in a package is enumerated as a die in CPUID. So there is one power domain per die. To allow die level controls, the current implementation creates a root domain and aggregates all information from power domains in it. This is well suited for configuration 1 above. But for configuration 2 above, the root domain will present the same information as present by power domain. So, no use of aggregating. To check the configuration, call topology_max_dies_per_package(). If it is more than one, avoid creating root domain. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20240820204558.1296319-1-srinivas.pandruvada@linux.intel.com Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.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 reStructuredText 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.