diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/perf/arch/arm64/util/header.c | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/perf/arch/arm64/util/header.c')
-rw-r--r-- | tools/perf/arch/arm64/util/header.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/tools/perf/arch/arm64/util/header.c b/tools/perf/arch/arm64/util/header.c new file mode 100644 index 000000000..d730666ab --- /dev/null +++ b/tools/perf/arch/arm64/util/header.c @@ -0,0 +1,101 @@ +#include <stdio.h> +#include <stdlib.h> +#include <perf/cpumap.h> +#include <util/cpumap.h> +#include <internal/cpumap.h> +#include <api/fs/fs.h> +#include <errno.h> +#include "debug.h" +#include "header.h" + +#define MIDR "/regs/identification/midr_el1" +#define MIDR_SIZE 19 +#define MIDR_REVISION_MASK 0xf +#define MIDR_VARIANT_SHIFT 20 +#define MIDR_VARIANT_MASK (0xf << MIDR_VARIANT_SHIFT) + +static int _get_cpuid(char *buf, size_t sz, struct perf_cpu_map *cpus) +{ + const char *sysfs = sysfs__mountpoint(); + u64 midr = 0; + int cpu; + + if (!sysfs || sz < MIDR_SIZE) + return EINVAL; + + cpus = perf_cpu_map__get(cpus); + + for (cpu = 0; cpu < perf_cpu_map__nr(cpus); cpu++) { + char path[PATH_MAX]; + FILE *file; + + scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d"MIDR, + sysfs, cpus->map[cpu]); + + file = fopen(path, "r"); + if (!file) { + pr_debug("fopen failed for file %s\n", path); + continue; + } + + if (!fgets(buf, MIDR_SIZE, file)) { + fclose(file); + continue; + } + fclose(file); + + /* Ignore/clear Variant[23:20] and + * Revision[3:0] of MIDR + */ + midr = strtoul(buf, NULL, 16); + midr &= (~(MIDR_VARIANT_MASK | MIDR_REVISION_MASK)); + scnprintf(buf, MIDR_SIZE, "0x%016lx", midr); + /* got midr break loop */ + break; + } + + perf_cpu_map__put(cpus); + + if (!midr) + return EINVAL; + + return 0; +} + +int get_cpuid(char *buf, size_t sz) +{ + struct perf_cpu_map *cpus = perf_cpu_map__new(NULL); + int ret; + + if (!cpus) + return EINVAL; + + ret = _get_cpuid(buf, sz, cpus); + + perf_cpu_map__put(cpus); + + return ret; +} + +char *get_cpuid_str(struct perf_pmu *pmu) +{ + char *buf = NULL; + int res; + + if (!pmu || !pmu->cpus) + return NULL; + + buf = malloc(MIDR_SIZE); + if (!buf) + return NULL; + + /* read midr from list of cpus mapped to this pmu */ + res = _get_cpuid(buf, MIDR_SIZE, pmu->cpus); + if (res) { + pr_err("failed to get cpuid string for PMU %s\n", pmu->name); + free(buf); + buf = NULL; + } + + return buf; +} |