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tools/power x86_energy_perf_policy: Enhance HWP enable

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[ Upstream commit c97c057d357c4b39b153e9e430bbf8976e05bd4e ]

On enabling HWP, preserve the reserved bits in MSR_PM_ENABLE.

Also, skip writing the MSR_PM_ENABLE if HWP is already enabled.

Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Len Brown 2025-09-19 14:07:02 -04:00 • committed by Greg Kroah-Hartman
commit 3c37caffe3
1 changed files with 9 additions and 4 deletions
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13
tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c
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@ -1024,13 +1024,18 @@ int update_hwp_request_pkg(int pkg)
int enable_hwp_on_cpu(int cpu)
{
unsigned long long msr;
unsigned long long old_msr, new_msr;
get_msr(cpu, MSR_PM_ENABLE, &msr);
put_msr(cpu, MSR_PM_ENABLE, 1);
get_msr(cpu, MSR_PM_ENABLE, &old_msr);
if (old_msr & 1)
return 0; /* already enabled */
new_msr = old_msr | 1;
put_msr(cpu, MSR_PM_ENABLE, new_msr);
if (verbose)
printf("cpu%d: MSR_PM_ENABLE old: %d new: %d\n", cpu, (unsigned int) msr, 1);
printf("cpu%d: MSR_PM_ENABLE old: %llX new: %llX\n", cpu, old_msr, new_msr);
return 0;
}