From: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: Will.Deacon@arm.com, catalin.marinas@arm.com,
mark.rutland@arm.com, acme@kernel.org,
alexander.shishkin@linux.intel.com, peterz@infradead.org,
mingo@redhat.com, jnair@caviumnetworks.com, gpkulkarni@gmail.com
Subject: [PATCH v2 2/4] perf tools arm64: Add support for get_cpuid_str function.
Date: Fri, 28 Apr 2017 10:23:45 +0530 [thread overview]
Message-ID: <1493355227-31492-3-git-send-email-ganapatrao.kulkarni@cavium.com> (raw)
In-Reply-To: <1493355227-31492-1-git-send-email-ganapatrao.kulkarni@cavium.com>
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 +
| 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
--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
next prev parent reply other threads:[~2017-04-28 4:54 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-28 4:53 [PATCH v2 0/4] Add support for ThunderX2 pmu events using json files Ganapatrao Kulkarni
2017-04-28 4:53 ` [PATCH v2 1/4] perf utils: passing pmu as a parameter to function get_cpuid_str Ganapatrao Kulkarni
2017-04-28 9:08 ` Jayachandran C
2017-04-28 9:19 ` Ganapatrao Kulkarni
2017-04-28 4:53 ` Ganapatrao Kulkarni [this message]
2017-04-28 4:53 ` [PATCH v2 3/4] perf utils: Add helper function is_pmu_core to detect PMU CORE devices Ganapatrao Kulkarni
2017-04-28 4:53 ` [PATCH v2 4/4] perf vendor events arm64: Add implementation defined pmu core events of ThunderX2 Ganapatrao Kulkarni
2017-04-28 17:20 ` Will Deacon
2017-05-02 8:27 ` Ganapatrao Kulkarni
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