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Currently, RAPL PMU support requires adding CPU model entries to
arch/x86/events/rapl.c for each new generation. However, RAPL MSRs are
not architectural and require platform-specific customization, making
arch/x86 an inappropriate location for this functionality.
The powercap subsystem already handles RAPL functionality and is the
natural place to consolidate all RAPL features. The powercap RAPL
driver already includes PMU support for TPMI-based RAPL interfaces,
making it straightforward to extend this support to MSR-based RAPL
interfaces as well.
This consolidation eliminates the need to maintain RAPL support in
multiple subsystems and provides a unified approach for both TPMI and
MSR-based RAPL implementations.
The MSR-based PMU support includes the following updates:
1. Register MSR-based PMU support for the supported platforms
and unregister it when no online CPUs remain in the package.
2. Remove existing checks that restrict RAPL PMU support to TPMI-based
interfaces and extend the logic to allow MSR-based RAPL interfaces.
3. Define a CPU model list to determine which processors should
register RAPL PMU interface through the powercap driver for
MSR-based RAPL, excluding those that support TPMI interface.
This list prevents conflicts with existing arch/x86 PMU code
that already registers RAPL PMU for some processors. Add
Panther Lake & Wildcat Lake to the CPU models list.
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
[ rjw: Changelog edits ]
Link: https://patch.msgid.link/20251121000539.386069-3-sathyanarayanan.kuppuswamy@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>