Messages in this thread Patch in this message | | | From | Ganapatrao Kulkarni <> | Subject | [PATCH v2 2/4] perf tools arm64: Add support for get_cpuid_str function. | Date | Fri, 28 Apr 2017 10:23:45 +0530 |
| |
function get_cpuid_str returns MIDR string of the first online cpu from the range of cpus associated with the pmu core device.
Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com> --- tools/perf/arch/arm64/util/Build | 1 + tools/perf/arch/arm64/util/header.c | 41 +++++++++++++++++++++++++++++++++++++ 2 files changed, 42 insertions(+) create mode 100644 tools/perf/arch/arm64/util/header.c
diff --git a/tools/perf/arch/arm64/util/Build b/tools/perf/arch/arm64/util/Build index cef6fb3..b1ab72d 100644 --- a/tools/perf/arch/arm64/util/Build +++ b/tools/perf/arch/arm64/util/Build @@ -1,3 +1,4 @@ +libperf-y += header.o libperf-$(CONFIG_DWARF) += dwarf-regs.o libperf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o diff --git a/tools/perf/arch/arm64/util/header.c b/tools/perf/arch/arm64/util/header.c new file mode 100644 index 0000000..d8980a6b --- /dev/null +++ b/tools/perf/arch/arm64/util/header.c @@ -0,0 +1,41 @@ +#include <stdio.h> +#include <stdlib.h> +#include "header.h" + +#define LINUX_SYS_CPU_DIRECTORY "/sys/devices/system/cpu/" +#define MIDR "/regs/identification/midr_el1" + +char *get_cpuid_str(struct perf_pmu *pmu) +{ + char *buf = malloc(128); + FILE *file; + char *ret = NULL; + int cpu; + char sys_file[256]; + struct cpu_map *cpus; + + if (!pmu->cpus) + return NULL; + + /* read midr from list of cpus mapped to this pmu */ + cpus = cpu_map__get(pmu->cpus); + + for (cpu = 0; cpu < cpus->nr; cpu++) { + sprintf(sys_file, LINUX_SYS_CPU_DIRECTORY"cpu%d"MIDR, + cpus->map[cpu]); + file = fopen(sys_file, "r"); + if (file) { + ret = fgets(buf, 128, file); + if (ret) { + buf[strlen(buf)-1] = '\0'; + fclose(file); + cpu_map__put(cpus); + return buf; + } + fclose(file); + } + } + cpu_map__put(cpus); + free(buf); + return ret; +} -- 1.8.1.4
| |