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,
zhangshaokun@hisilicon.com, Robert.Richter@cavium.com,
gpkulkarni@gmail.com
Subject: [PATCH v5 2/4] perf tools arm64: Add support for get_cpuid_str function.
Date: Wed, 16 Aug 2017 12:40:46 +0530 [thread overview]
Message-ID: <20170816071048.26087-3-ganapatrao.kulkarni@cavium.com> (raw)
In-Reply-To: <20170816071048.26087-1-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 +
| 61 +++++++++++++++++++++++++++++++++++++
2 files changed, 62 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..713ef17
--- /dev/null
+++ b/tools/perf/arch/arm64/util/header.c
@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <api/fs/fs.h>
+#include "header.h"
+
+#define MIDR "/regs/identification/midr_el1"
+#define MIDR_SIZE 128
+
+char *get_cpuid_str(struct perf_pmu *pmu)
+{
+ char *buf = NULL;
+ char *temp = NULL;
+ char path[PATH_MAX];
+ const char *sysfs = sysfs__mountpoint();
+ int cpu;
+ unsigned long long midr = 0;
+ struct cpu_map *cpus;
+ FILE *file;
+
+ if (!sysfs || !pmu->cpus)
+ return NULL;
+
+ buf = malloc(MIDR_SIZE);
+ if (!buf)
+ 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++) {
+ scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d"MIDR,
+ sysfs, cpus->map[cpu]);
+
+ file = fopen(path, "r");
+ if (!file) {
+ pr_err("fopen failed for file %s\n", path);
+ continue;
+ }
+
+ temp = fgets(buf, MIDR_SIZE, file);
+ if (!temp)
+ continue;
+ fclose(file);
+
+ /* Ignore/clear Variant[23:20] and
+ * Revision[3:0] of MIDR
+ */
+ midr = strtoll(buf, NULL, 16);
+ midr &= (~(0xf << 20 | 0xf));
+ scnprintf(buf, MIDR_SIZE, "0x%016llx", midr);
+ /* got midr break loop */
+ break;
+ }
+
+ if (!midr) {
+ free(buf);
+ buf = NULL;
+ }
+
+ cpu_map__put(cpus);
+ return buf;
+}
--
2.9.4
next prev parent reply other threads:[~2017-08-16 7:11 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-16 7:10 [PATCH v5 0/4] Add support for ThunderX2 pmu events using json files Ganapatrao Kulkarni
2017-08-16 7:10 ` [PATCH v5 1/4] perf utils: passing pmu as a parameter to function get_cpuid_str Ganapatrao Kulkarni
2017-08-16 7:10 ` Ganapatrao Kulkarni [this message]
2017-08-23 10:17 ` [PATCH v5 2/4] perf tools arm64: Add support for get_cpuid_str function Will Deacon
2017-08-24 9:56 ` Ganapatrao Kulkarni
2017-08-16 7:10 ` [PATCH v5 3/4] perf utils: Add helper function is_pmu_core to detect PMU CORE devices Ganapatrao Kulkarni
2017-08-16 7:10 ` [PATCH v5 4/4] perf vendor events arm64: Add ThunderX2 implementation defined pmu core events Ganapatrao Kulkarni
2017-08-22 4:21 ` [PATCH v5 0/4] Add support for ThunderX2 pmu events using json files Ganapatrao Kulkarni
2017-08-23 9:22 ` John Garry
2017-08-24 7:23 ` Ganapatrao Kulkarni
2017-08-24 11:08 ` John Garry
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