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tools/power/turbostat: Read energy_perf_bias from sysfs 

... instead of poking at the MSR directly.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Len Brown <lenb@kernel.org>
Cc: linux-pm@vger.kernel.org
Link: https://lkml.kernel.org/r/20201029190259.3476-3-bp@alien8.de
This commit is contained in:
Borislav Petkov 2020-10-15 14:50:16 +02:00
parent 8113ab20e8
commit 6d6501d912
1 changed files with 24 additions and 5 deletions
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29
tools/power/x86/turbostat/turbostat.c
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@ -1721,6 +1721,25 @@ int get_mp(int cpu, struct msr_counter *mp, unsigned long long *counterp)
return 0; return 0;
} }
int get_epb(int cpu)
{
char path[128 + PATH_BYTES];
int ret, epb = -1;
FILE *fp;
sprintf(path, "/sys/devices/system/cpu/cpu%d/power/energy_perf_bias", cpu);
fp = fopen_or_die(path, "r");
ret = fscanf(fp, "%d", &epb);
if (ret != 1)
err(1, "%s(%s)", __func__, path);
fclose(fp);
return epb;
}
void get_apic_id(struct thread_data *t) void get_apic_id(struct thread_data *t)
{ {
unsigned int eax, ebx, ecx, edx; unsigned int eax, ebx, ecx, edx;
@ -3631,9 +3650,8 @@ dump_sysfs_pstate_config(void)
*/ */
int print_epb(struct thread_data *t, struct core_data *c, struct pkg_data *p) int print_epb(struct thread_data *t, struct core_data *c, struct pkg_data *p)
{ {
unsigned long long msr;
char *epb_string; char *epb_string;
int cpu; int cpu, epb;
if (!has_epb) if (!has_epb)
return 0; return 0;
@ -3649,10 +3667,11 @@ int print_epb(struct thread_data *t, struct core_data *c, struct pkg_data *p)
return -1; return -1;
} }
if (get_msr(cpu, MSR_IA32_ENERGY_PERF_BIAS, &msr)) epb = get_epb(cpu);
if (epb < 0)
return 0; return 0;
switch (msr & 0xF) { switch (epb) {
case ENERGY_PERF_BIAS_PERFORMANCE: case ENERGY_PERF_BIAS_PERFORMANCE:
epb_string = "performance"; epb_string = "performance";
break; break;
@ -3666,7 +3685,7 @@ int print_epb(struct thread_data *t, struct core_data *c, struct pkg_data *p)
epb_string = "custom"; epb_string = "custom";
break; break;
} }
fprintf(outf, "cpu%d: MSR_IA32_ENERGY_PERF_BIAS: 0x%08llx (%s)\n", cpu, msr, epb_string); fprintf(outf, "cpu%d: EPB: %d (%s)\n", cpu, epb, epb_string);
return 0; return 0;
} }