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 v3 2/4] perf tools arm64: Add support for get_cpuid_str function.
Date: Tue, 16 May 2017 14:03:37 +0530 [thread overview]
Message-ID: <1494923619-18687-3-git-send-email-ganapatrao.kulkarni@cavium.com> (raw)
In-Reply-To: <1494923619-18687-1-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 +
| 59 +++++++++++++++++++++++++++++++++++++
2 files changed, 60 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..4e25498
--- /dev/null
+++ b/tools/perf/arch/arm64/util/header.c
@@ -0,0 +1,59 @@
+#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 = malloc(MIDR_SIZE);
+ char *temp = NULL;
+ char path[PATH_MAX];
+ const char *sysfs = sysfs__mountpoint();
+ int cpu, ret;
+ unsigned long long midr;
+ struct cpu_map *cpus;
+ FILE *file;
+
+ if (!pmu->cpus)
+ return NULL;
+
+ if (!sysfs)
+ 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++) {
+ ret = snprintf(path, PATH_MAX,
+ "%s/devices/system/cpu/cpu%d"MIDR,
+ sysfs, cpus->map[cpu]);
+ if (ret == PATH_MAX) {
+ pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
+ goto err;
+ }
+
+ file = fopen(path, "r");
+ if (!file)
+ continue;
+
+ temp = fgets(buf, MIDR_SIZE, file);
+ fclose(file);
+ if (!temp)
+ continue;
+
+ /* Ignore/clear Variant[23:20] and
+ * Revision[3:0] of MIDR
+ */
+ midr = strtoll(buf, NULL, 16);
+ midr &= (~(0xf << 20 | 0xf));
+ snprintf(buf, MIDR_SIZE, "0x%016llx", midr);
+ cpu_map__put(cpus);
+ return buf;
+ }
+
+err: cpu_map__put(cpus);
+ free(buf);
+ return NULL;
+}
--
1.8.1.4
next prev parent reply other threads:[~2017-05-16 8:35 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-16 8:33 [PATCH v3 0/4] Add support for ThunderX2 pmu events using json files Ganapatrao Kulkarni
2017-05-16 8:33 ` [PATCH v3 1/4] perf utils: passing pmu as a parameter to function get_cpuid_str Ganapatrao Kulkarni
2017-05-16 8:33 ` Ganapatrao Kulkarni [this message]
2017-05-16 8:33 ` [PATCH v3 3/4] perf utils: Add helper function is_pmu_core to detect PMU CORE devices Ganapatrao Kulkarni
2017-05-16 8:33 ` [PATCH v3 4/4] perf vendor events arm64: Add ThunderX2 implementation defined pmu core events Ganapatrao Kulkarni
2017-05-29 3:19 ` [PATCH v3 0/4] Add support for ThunderX2 pmu events using json files Ganapatrao Kulkarni
2017-06-09 2:19 ` Ganapatrao Kulkarni
2017-06-12 9:49 ` Zhangshaokun
2017-06-12 10:21 ` Ganapatrao Kulkarni
2017-06-23 17:13 ` Ganapatrao Kulkarni
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