97 lines
1.7 KiB
C
97 lines
1.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Implementation of get_cpuid().
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*
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* Author: Nikita Shubin <n.shubin@yadro.com>
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* Bibo Mao <maobibo@loongson.cn>
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* Huacai Chen <chenhuacai@loongson.cn>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <api/fs/fs.h>
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#include <errno.h>
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#include "util/debug.h"
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#include "util/header.h"
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/*
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* Output example from /proc/cpuinfo
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* CPU Family : Loongson-64bit
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* Model Name : Loongson-3C5000
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* CPU Revision : 0x10
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* FPU Revision : 0x01
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*/
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#define CPUINFO_MODEL "Model Name"
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#define CPUINFO "/proc/cpuinfo"
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static char *_get_field(const char *line)
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{
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char *line2, *nl;
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line2 = strrchr(line, ' ');
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if (!line2)
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return NULL;
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line2++;
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nl = strrchr(line, '\n');
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if (!nl)
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return NULL;
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return strndup(line2, nl - line2);
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}
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static char *_get_cpuid(void)
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{
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unsigned long line_sz;
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char *line, *model, *cpuid;
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FILE *file;
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file = fopen(CPUINFO, "r");
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if (file == NULL)
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return NULL;
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line = model = cpuid = NULL;
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while (getline(&line, &line_sz, file) != -1) {
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if (strncmp(line, CPUINFO_MODEL, strlen(CPUINFO_MODEL)))
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continue;
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model = _get_field(line);
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if (!model)
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goto out_free;
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break;
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}
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if (model && (asprintf(&cpuid, "%s", model) < 0))
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cpuid = NULL;
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out_free:
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fclose(file);
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free(model);
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return cpuid;
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}
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int get_cpuid(char *buffer, size_t sz, struct perf_cpu cpu __maybe_unused)
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{
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int ret = 0;
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char *cpuid = _get_cpuid();
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if (!cpuid)
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return EINVAL;
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if (sz < strlen(cpuid)) {
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ret = ENOBUFS;
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goto out_free;
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}
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scnprintf(buffer, sz, "%s", cpuid);
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out_free:
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free(cpuid);
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return ret;
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}
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char *get_cpuid_str(struct perf_cpu cpu __maybe_unused)
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{
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return _get_cpuid();
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}
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