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// SPDX-License-Identifier: GPL-2.0-only
/*
* Implementation of get_cpuid().
*
* Author: Nikita Shubin <n.shubin@yadro.com>
* Bibo Mao <maobibo@loongson.cn>
* Huacai Chen <chenhuacai@loongson.cn>
*/
#include <stdio.h>
#include <stdlib.h>
#include <api/fs/fs.h>
#include <errno.h>
#include "util/debug.h"
#include "util/header.h"
/*
* Output example from /proc/cpuinfo
* CPU Family : Loongson-64bit
* Model Name : Loongson-3C5000
* CPU Revision : 0x10
* FPU Revision : 0x01
*/
#define CPUINFO_MODEL "Model Name"
#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)
{
unsigned long line_sz;
char *line, *model, *cpuid;
FILE *file;
file = fopen(CPUINFO, "r");
if (file == NULL)
return NULL;
line = model = cpuid = NULL;
while (getline(&line, &line_sz, file) != -1) {
if (strncmp(line, CPUINFO_MODEL, strlen(CPUINFO_MODEL)))
continue;
model = _get_field(line);
if (!model)
goto out_free;
break;
}
if (model && (asprintf(&cpuid, "%s", model) < 0))
cpuid = NULL;
out_free:
fclose(file);
free(model);
return cpuid;
}
int get_cpuid(char *buffer, size_t sz)
{
int ret = 0;
char *cpuid = _get_cpuid();
if (!cpuid)
return EINVAL;
if (sz < strlen(cpuid)) {
ret = ENOBUFS;
goto out_free;
}
scnprintf(buffer, sz, "%s", cpuid);
out_free:
free(cpuid);
return ret;
}
char *get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
{
return _get_cpuid();
}
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