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tools/power/x86/intel-speed-select: Max CPU count calculation when CPU0 is offline

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Currently /sys/devices/system/cpu/cpu0/topology/thread_siblings is used to
get the max CPU count. But when CPU0 is offline, then this file will be
absent.

So add processing so that we can get count from any first CPU in the
system. which is online.

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 14:45:17 -08:00 committed by Andy Shevchenko
parent 696691985c
commit 864dc09e69
1 changed files with 16 additions and 2 deletions
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18
tools/power/x86/intel-speed-select/isst-config.c
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@ -316,10 +316,24 @@ static void set_max_cpu_num(void)
{
FILE *filep;
unsigned long dummy;
int i;
topo_max_cpus = 0;
filep = fopen_or_exit(
"/sys/devices/system/cpu/cpu0/topology/thread_siblings", "r");
for (i = 0; i < 256; ++i) {
char path[256];
snprintf(path, sizeof(path),
"/sys/devices/system/cpu/cpu%d/topology/thread_siblings", i);
filep = fopen(path, "r");
if (filep)
break;
}
if (!filep) {
fprintf(stderr, "Can't get max cpu number\n");
exit(0);
}
while (fscanf(filep, "%lx,", &dummy) == 1)
topo_max_cpus += BITMASK_SIZE;
fclose(filep);