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tools/power/x86/intel-speed-select: Special handling for CPU 0 online/offline

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When "-o" option for force online/offline is used with command:
perf-profile set-config-level

If the config level calls for CPU 0 online/offline, then call fails
as there is special kernel setup required for CPU 0 online/offline
and the currently not setup for that.

But when call is for online CPU 0, then don't fail. Just warn that
this system is not setup for CPU 0 online/offline.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Srinivas Pandruvada 2020-03-05 14:45:16 -08:00 committed by Andy Shevchenko
parent 6320c9fb91
commit 696691985c
1 changed files with 7 additions and 1 deletions
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8
tools/power/x86/intel-speed-select/isst-config.c
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@ -220,8 +220,14 @@ static void set_cpu_online_offline(int cpu, int state)
"/sys/devices/system/cpu/cpu%d/online", cpu);
fd = open(buffer, O_WRONLY);
if (fd < 0)
if (fd < 0) {
if (!cpu && state) {
fprintf(stderr, "This system is not configured for CPU 0 online/offline\n");
fprintf(stderr, "Ignoring online request for CPU 0 as this is already online\n");
return;
}
err(-1, "%s open failed", buffer);
}
if (state)
ret = write(fd, "1\n", 2);