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 2/3] perf tools arm64: implement function get_cpuid_str
Date: Tue, 4 Apr 2017 13:06:42 +0530 [thread overview]
Message-ID: <1491291403-29893-3-git-send-email-ganapatrao.kulkarni@cavium.com> (raw)
In-Reply-To: <1491291403-29893-1-git-send-email-ganapatrao.kulkarni@cavium.com>
function get_cpuid_str returns midr_el1 value from first
online cpu available.
Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
---
tools/perf/arch/arm64/util/Build | 1 +
| 51 +++++++++++++++++++++++++++++++++++++
2 files changed, 52 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..c0468fe
--- /dev/null
+++ b/tools/perf/arch/arm64/util/header.c
@@ -0,0 +1,51 @@
+#include <fnmatch.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <linux/stringify.h>
+#include "header.h"
+#include "util.h"
+
+#define LINUX_SYS_CPU_DIRECTORY "/sys/devices/system/cpu/"
+#define MIDR "/regs/identification/midr_el1"
+
+char *get_cpuid_str(void)
+{
+ char *buf = malloc(128);
+ FILE *file;
+ char *ret = NULL;
+ int cpu , nr_cpu;
+ char sys_file[256];
+
+ sprintf(sys_file, LINUX_SYS_CPU_DIRECTORY"kernel_max");
+
+ file = fopen(sys_file, "r");
+ if (!file)
+ return ret;
+
+ if (fscanf(file, "%d", &nr_cpu) != 1)
+ return ret;
+
+ /* kernel_max returns nr_cpu -1 */
+ nr_cpu++;
+
+ /*iterate till you read midr of first online cpu */
+ for(cpu = 0; cpu < nr_cpu; cpu++)
+ {
+ sprintf(sys_file, LINUX_SYS_CPU_DIRECTORY"cpu%d"MIDR, cpu);
+ file = fopen(sys_file, "r");
+ if (file) {
+ ret = fgets(buf, 128, file);
+ if (ret) {
+ buf[strlen(buf)-1] ='\0';
+ fclose(file);
+ return buf;
+ }
+ fclose(file);
+ }
+ }
+ free(buf);
+ return ret;
+}
--
1.8.1.4
next prev parent reply other threads:[~2017-04-04 7:37 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-04 7:36 [PATCH 0/3] Add support for ThunderX2 pmu events using json files Ganapatrao Kulkarni
2017-04-04 7:36 ` [PATCH 1/3] perf jevents: Add support to use core pmu name other than cpu Ganapatrao Kulkarni
2017-04-04 7:36 ` Ganapatrao Kulkarni [this message]
2017-04-04 12:25 ` [PATCH 2/3] perf tools arm64: implement function get_cpuid_str Mark Rutland
2017-04-05 9:18 ` Ganapatrao Kulkarni
2017-04-04 7:36 ` [PATCH 3/3] perf tool, arm64, thunderx2: Add implementation defined events for ThunderX2 Ganapatrao Kulkarni
2017-04-04 12:28 ` Mark Rutland
2017-04-05 9:12 ` Ganapatrao Kulkarni
2017-04-05 10:05 ` Mark Rutland
2017-04-06 4:20 ` Ganapatrao Kulkarni
2017-04-06 9:55 ` Mark Rutland
2017-04-19 18:07 ` Ganapatrao Kulkarni
2017-04-20 8:53 ` Mark Rutland
2017-04-04 12:29 ` [PATCH 0/3] Add support for ThunderX2 pmu events using json files Mark Rutland
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