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.
Signed-off-by: Harry Pan <harry.pan@xxxxxxxxx>
---
drivers/platform/x86/intel_pmc_core.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index f2c621b55f49..20e0843ebfb4 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"
@@ -726,7 +727,6 @@ static int pmc_core_ltr_show(struct seq_file *s, void *unused)
return 0;
}
DEFINE_SHOW_ATTRIBUTE(pmc_core_ltr);
-
static int pmc_core_pkgc_show(struct seq_file *s, void *unused)
{
struct pmc_dev *pmcdev = s->private;
@@ -738,8 +738,8 @@ 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
