powercap/intel_rapl: enumerate Psys RAPL domain together with package RAPL domain

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On multi-package systems, the Psys MSR is only valid for CPUs on
specific package (master package). The current code makes the
assumption that package 0 is the master package, but this is not
true on new platforms like SPR.

Fix the problem by emuerating the Psys RAPL domain for every
package, so CPUs in slave packages will read 0 for the Psys energy
counter and only CPUs in master packages can get a valid reading
and register the Psys RAPL domain.

The sysfs I/F for the Psys RAPL domain is not changed.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

...

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Zhang Rui 2020-10-13 15:42:41 +08:00 • committed by Rafael J. Wysocki

parent 7a57e9f112

commit f1e8d7560d

3 changed files with 18 additions and 74 deletions

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80

drivers/powercap/intel_rapl_common.c

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5

drivers/powercap/intel_rapl_msr.c

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7

include/linux/intel_rapl.h

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