25c2e59117
The get_cpuid_str function returns the string that contains values of MVENDORID, MARCHID and MIMPID in hex format separated by coma. The values themselves are taken from first cpu entry in "/proc/cpuid" that contains "mvendorid", "marchid" and "mimpid". Signed-off-by: Nikita Shubin <n.shubin@yadro.com> Tested-by: Kautuk Consul <kconsul@ventanamicro.com> Acked-by: Palmer Dabbelt <palmer@rivosinc.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Anup Patel <anup@brainfault.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linux-riscv@lists.infradead.org Cc: linux@yadro.com Link: https://lore.kernel.org/r/20220815132251.25702-2-nikita.shubin@maquefel.me Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
104 lines
1.8 KiB
C
104 lines
1.8 KiB
C
// 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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*/
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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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#define CPUINFO_MVEN "mvendorid"
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#define CPUINFO_MARCH "marchid"
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#define CPUINFO_MIMP "mimpid"
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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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char *line = NULL;
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char *mvendorid = NULL;
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char *marchid = NULL;
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char *mimpid = NULL;
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char *cpuid = NULL;
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int read;
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unsigned long line_sz;
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FILE *cpuinfo;
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cpuinfo = fopen(CPUINFO, "r");
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if (cpuinfo == NULL)
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return cpuid;
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while ((read = getline(&line, &line_sz, cpuinfo)) != -1) {
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if (!strncmp(line, CPUINFO_MVEN, strlen(CPUINFO_MVEN))) {
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mvendorid = _get_field(line);
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if (!mvendorid)
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goto free;
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} else if (!strncmp(line, CPUINFO_MARCH, strlen(CPUINFO_MARCH))) {
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marchid = _get_field(line);
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if (!marchid)
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goto free;
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} else if (!strncmp(line, CPUINFO_MIMP, strlen(CPUINFO_MIMP))) {
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mimpid = _get_field(line);
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if (!mimpid)
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goto free;
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break;
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}
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}
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if (!mvendorid || !marchid || !mimpid)
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goto free;
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if (asprintf(&cpuid, "%s-%s-%s", mvendorid, marchid, mimpid) < 0)
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cpuid = NULL;
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free:
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fclose(cpuinfo);
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free(mvendorid);
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free(marchid);
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free(mimpid);
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return cpuid;
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}
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int get_cpuid(char *buffer, size_t sz)
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{
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char *cpuid = _get_cpuid();
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int ret = 0;
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if (sz < strlen(cpuid)) {
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ret = -EINVAL;
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goto free;
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}
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scnprintf(buffer, sz, "%s", cpuid);
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free:
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free(cpuid);
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return ret;
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}
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char *
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get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
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{
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return _get_cpuid();
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}
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