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#include <stdio.h>
#include <stdlib.h>
#include <api/fs/fs.h>
#include <errno.h>
#include "../../util/debug.h"
#include "../../util/header.h"
#define STR_LEN 1024
#define ID_SIZE 64
static int _get_cpuid(char *buf, size_t sz)
{
const char *sysfs = sysfs__mountpoint();
u64 id = 0;
char path[PATH_MAX];
FILE *file;
if (!sysfs || sz < ID_SIZE)
return -EINVAL;
scnprintf(path, PATH_MAX, "%s/devices/platform/riscv-pmu/id",
sysfs);
file = fopen(path, "r");
if (!file) {
pr_debug("fopen failed for file %s\n", path);
return -EINVAL;
}
if (!fgets(buf, ID_SIZE, file)) {
fclose(file);
return -EINVAL;
}
fclose(file);
/*Check if value is numeric and remove special characters*/
id = strtoul(buf, NULL, 16);
if (!id)
return -EINVAL;
scnprintf(buf, ID_SIZE, "0x%lx", id);
return 0;
}
char *get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
{
char *buf = NULL;
int res;
if (!pmu)
return NULL;
buf = malloc(ID_SIZE);
if (!buf)
return NULL;
/* read id */
res = _get_cpuid(buf, ID_SIZE);
if (res) {
pr_err("failed to get cpuid string for PMU %s\n", pmu->name);
free(buf);
buf = NULL;
}
return buf;
}
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