66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
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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 "header.h"
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#define MIDR "/regs/identification/midr_el1"
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#define MIDR_SIZE 19
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#define MIDR_REVISION_MASK 0xf
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#define MIDR_VARIANT_SHIFT 20
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#define MIDR_VARIANT_MASK (0xf << MIDR_VARIANT_SHIFT)
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char *get_cpuid_str(struct perf_pmu *pmu)
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{
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char *buf = NULL;
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char path[PATH_MAX];
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const char *sysfs = sysfs__mountpoint();
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int cpu;
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u64 midr = 0;
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struct cpu_map *cpus;
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FILE *file;
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if (!sysfs || !pmu || !pmu->cpus)
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return NULL;
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buf = malloc(MIDR_SIZE);
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if (!buf)
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return NULL;
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/* read midr from list of cpus mapped to this pmu */
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cpus = cpu_map__get(pmu->cpus);
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for (cpu = 0; cpu < cpus->nr; cpu++) {
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scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d"MIDR,
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sysfs, cpus->map[cpu]);
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file = fopen(path, "r");
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if (!file) {
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pr_debug("fopen failed for file %s\n", path);
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continue;
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}
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if (!fgets(buf, MIDR_SIZE, file)) {
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fclose(file);
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continue;
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}
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fclose(file);
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/* Ignore/clear Variant[23:20] and
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* Revision[3:0] of MIDR
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*/
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midr = strtoul(buf, NULL, 16);
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midr &= (~(MIDR_VARIANT_MASK | MIDR_REVISION_MASK));
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scnprintf(buf, MIDR_SIZE, "0x%016lx", midr);
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/* got midr break loop */
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break;
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}
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if (!midr) {
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pr_err("failed to get cpuid string for PMU %s\n", pmu->name);
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free(buf);
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buf = NULL;
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}
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cpu_map__put(cpus);
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return buf;
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}
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