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tools/power turbostat: Handle non-root legacy-uncore sysfs permissions 

/sys/devices/system/cpu/intel_uncore_frequency/package_X_die_Y/
may be readable by all, but
/sys/devices/system/cpu/intel_uncore_frequency/package_X_die_Y/current_freq_khz
may be readable only by root.

Non-root turbostat users see complaints in this scenario.

Fail probe of the interface if we can't read current_freq_khz.

Reported-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Original-patch-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown 2025-08-09 16:31:31 -04:00
parent 378e901160
commit e60a13bcef
1 changed files with 2 additions and 1 deletions
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3
tools/power/x86/turbostat/turbostat.c
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@ -7002,7 +7002,8 @@ static void probe_intel_uncore_frequency_legacy(void)
sprintf(path_base, "/sys/devices/system/cpu/intel_uncore_frequency/package_%02d_die_%02d", i,
j);
if (access(path_base, R_OK))
sprintf(path, "%s/current_freq_khz", path_base);
if (access(path, R_OK))
continue;
BIC_PRESENT(BIC_UNCORE_MHZ);