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// SPDX-License-Identifier: GPL-2.0-only
/*
* Implementation of get_cpuid().
*
* Author: Nikita Shubin <n.shubin@yadro.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <api/fs/fs.h>
#include <errno.h>
#include "../../util/debug.h"
#include "../../util/header.h"
#define CPUINFO_MVEN "mvendorid"
#define CPUINFO_MARCH "marchid"
#define CPUINFO_MIMP "mimpid"
#define CPUINFO "/proc/cpuinfo"
static char *_get_field(const char *line)
{
char *line2, *nl;
line2 = strrchr(line, ' ');
if (!line2)
return NULL;
line2++;
nl = strrchr(line, '\n');
if (!nl)
return NULL;
return strndup(line2, nl - line2);
}
static char *_get_cpuid(void)
{
char *line = NULL;
char *mvendorid = NULL;
char *marchid = NULL;
char *mimpid = NULL;
char *cpuid = NULL;
int read;
size_t line_sz;
FILE *cpuinfo;
cpuinfo = fopen(CPUINFO, "r");
if (cpuinfo == NULL)
return cpuid;
while ((read = getline(&line, &line_sz, cpuinfo)) != -1) {
if (!strncmp(line, CPUINFO_MVEN, strlen(CPUINFO_MVEN))) {
mvendorid = _get_field(line);
if (!mvendorid)
goto free;
} else if (!strncmp(line, CPUINFO_MARCH, strlen(CPUINFO_MARCH))) {
marchid = _get_field(line);
if (!marchid)
goto free;
} else if (!strncmp(line, CPUINFO_MIMP, strlen(CPUINFO_MIMP))) {
mimpid = _get_field(line);
if (!mimpid)
goto free;
break;
}
}
if (!mvendorid || !marchid || !mimpid)
goto free;
if (asprintf(&cpuid, "%s-%s-%s", mvendorid, marchid, mimpid) < 0)
cpuid = NULL;
free:
fclose(cpuinfo);
free(mvendorid);
free(marchid);
free(mimpid);
return cpuid;
}
int get_cpuid(char *buffer, size_t sz)
{
char *cpuid = _get_cpuid();
int ret = 0;
if (sz < strlen(cpuid)) {
ret = -EINVAL;
goto free;
}
scnprintf(buffer, sz, "%s", cpuid);
free:
free(cpuid);
return ret;
}
char *
get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
{
return _get_cpuid();
}
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