3 #include <perf/cpumap.h>
4 #include <util/cpumap.h>
5 #include <internal/cpumap.h>
11 #define MIDR "/regs/identification/midr_el1"
13 #define MIDR_REVISION_MASK 0xf
14 #define MIDR_VARIANT_SHIFT 20
15 #define MIDR_VARIANT_MASK (0xf << MIDR_VARIANT_SHIFT)
17 static int _get_cpuid(char *buf, size_t sz, struct perf_cpu_map *cpus)
19 const char *sysfs = sysfs__mountpoint();
23 if (!sysfs || sz < MIDR_SIZE)
26 cpus = perf_cpu_map__get(cpus);
28 for (cpu = 0; cpu < perf_cpu_map__nr(cpus); cpu++) {
32 scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d"MIDR,
33 sysfs, cpus->map[cpu]);
35 file = fopen(path, "r");
37 pr_debug("fopen failed for file %s\n", path);
41 if (!fgets(buf, MIDR_SIZE, file)) {
47 /* Ignore/clear Variant[23:20] and
48 * Revision[3:0] of MIDR
50 midr = strtoul(buf, NULL, 16);
51 midr &= (~(MIDR_VARIANT_MASK | MIDR_REVISION_MASK));
52 scnprintf(buf, MIDR_SIZE, "0x%016lx", midr);
53 /* got midr break loop */
57 perf_cpu_map__put(cpus);
65 int get_cpuid(char *buf, size_t sz)
67 struct perf_cpu_map *cpus = perf_cpu_map__new(NULL);
73 ret = _get_cpuid(buf, sz, cpus);
75 perf_cpu_map__put(cpus);
80 char *get_cpuid_str(struct perf_pmu *pmu)
85 if (!pmu || !pmu->cpus)
88 buf = malloc(MIDR_SIZE);
92 /* read midr from list of cpus mapped to this pmu */
93 res = _get_cpuid(buf, MIDR_SIZE, pmu->cpus);
95 pr_err("failed to get cpuid string for PMU %s\n", pmu->name);