cpufreq/amd-pstate: Always write EPP value when updating perf

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For MSR systems the EPP value is in the same register as perf targets
and so divding them into two separate MSR writes is wasteful.

In msr_update_perf(), update both EPP and perf values in one write to
MSR_AMD_CPPC_REQ, and cache them if successful.

To accomplish this plumb the EPP value into the update_perf call and
modify all its callers to check the return value.

As this unifies calls, ensure that the MSR write is necessary before
flushing a write out. Also drop the comparison from the passive flow
tracing.

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Link: https://lore.kernel.org/r/20241209185248.16301-13-mario.limonciello@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>

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This commit is contained in:

Mario Limonciello 2024-12-09 12:52:45 -06:00

parent b3781f30bf

commit fff3957969

2 changed files with 56 additions and 59 deletions

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7

drivers/cpufreq/amd-pstate-trace.h

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110

drivers/cpufreq/amd-pstate.c

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