tools/power turbostat: Warn on bad ACPI LPIT data

On some systems /sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us
or /sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us
return a file error because of bad ACPI LPIT data from a misconfigured BIOS.
turbostat interprets this failure as a fatal error and outputs

	turbostat: CPU LPI: No data available

If the ACPI LPIT sysfs files return an error output a warning instead of
a fatal error, disable the ACPI LPIT evaluation code, and continue.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 9817abd215b9f2714da7a40ec57406e8f68efb1c..442af78924021a51958e6dc459ff36cd580a3f8e 100644 (file)
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -2921,8 +2921,11 @@ int snapshot_cpu_lpi_us(void)
        fp = fopen_or_die("/sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us", "r");
 
        retval = fscanf(fp, "%lld", &cpuidle_cur_cpu_lpi_us);
-       if (retval != 1)
-               err(1, "CPU LPI");
+       if (retval != 1) {
+               fprintf(stderr, "Disabling Low Power Idle CPU output\n");
+               BIC_NOT_PRESENT(BIC_CPU_LPI);
+               return -1;
+       }
 
        fclose(fp);
 
@@ -2944,9 +2947,11 @@ int snapshot_sys_lpi_us(void)
        fp = fopen_or_die("/sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us", "r");
 
        retval = fscanf(fp, "%lld", &cpuidle_cur_sys_lpi_us);
-       if (retval != 1)
-               err(1, "SYS LPI");
-
+       if (retval != 1) {
+               fprintf(stderr, "Disabling Low Power Idle System output\n");
+               BIC_NOT_PRESENT(BIC_SYS_LPI);
+               return -1;
+       }
        fclose(fp);
 
        return 0;