Refer to the Intel SDM Vol.4, the package C-state residency counters of modern IA micro-architecture are all ticking in TSC frequency, hence we can apply simple math to transform the ticks into microseconds. i.e., residency (ms) = count / tsc_khz residency (us) = count / tsc_khz * 1000 This also aligns to other sysfs debug entries of residency counter in the same metric in microseconds, benefits reading and scripting. v2: restore the accidentally deleted newline, no function change. Signed-off-by: Harry Pan <harry.pan@xxxxxxxxx> --- drivers/platform/x86/intel_pmc_core.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c index f2c621b55f49..c78918a7e731 100644 --- a/drivers/platform/x86/intel_pmc_core.c +++ b/drivers/platform/x86/intel_pmc_core.c @@ -24,6 +24,7 @@ #include <asm/cpu_device_id.h> #include <asm/intel-family.h> #include <asm/msr.h> +#include <asm/tsc.h> #include "intel_pmc_core.h" @@ -738,8 +739,8 @@ static int pmc_core_pkgc_show(struct seq_file *s, void *unused) if (rdmsrl_safe(map[index].bit_mask, &pcstate_count)) continue; - seq_printf(s, "%-8s : 0x%llx\n", map[index].name, - pcstate_count); + seq_printf(s, "%-8s : %llu\n", map[index].name, + pcstate_count * 1000 / tsc_khz); } return 0; -- 2.20.1
