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.kulka...@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
