From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752820AbdLFQnH (ORCPT ); Wed, 6 Dec 2017 11:43:07 -0500 Received: from terminus.zytor.com ([65.50.211.136]:43745 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752034AbdLFQm7 (ORCPT ); Wed, 6 Dec 2017 11:42:59 -0500 Date: Wed, 6 Dec 2017 08:39:03 -0800 From: tip-bot for Ganapatrao Kulkarni Message-ID: Cc: hpa@zytor.com, jonathan.cameron@huawei.com, will.deacon@arm.com, tglx@linutronix.de, catalin.marinas@arm.com, robert.richter@cavium.com, acme@redhat.com, ganapatrao.kulkarni@cavium.com, alexander.shishkin@linux.intel.com, jnair@caviumnetworks.com, zhangshaokun@hisilicon.com, peterz@infradead.org, mark.rutland@arm.com, gklkml16@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org Reply-To: hpa@zytor.com, jonathan.cameron@huawei.com, will.deacon@arm.com, catalin.marinas@arm.com, tglx@linutronix.de, acme@redhat.com, robert.richter@cavium.com, zhangshaokun@hisilicon.com, jnair@caviumnetworks.com, alexander.shishkin@linux.intel.com, ganapatrao.kulkarni@cavium.com, mark.rutland@arm.com, peterz@infradead.org, mingo@kernel.org, linux-kernel@vger.kernel.org, gklkml16@gmail.com In-Reply-To: <20171016183222.25750-3-ganapatrao.kulkarni@cavium.com> References: <20171016183222.25750-3-ganapatrao.kulkarni@cavium.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] perf tools arm64: Add support for get_cpuid_str function. Git-Commit-ID: b57df28893543db3466172088786fae39b7fc3ad X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: b57df28893543db3466172088786fae39b7fc3ad Gitweb: https://git.kernel.org/tip/b57df28893543db3466172088786fae39b7fc3ad Author: Ganapatrao Kulkarni AuthorDate: Tue, 17 Oct 2017 00:02:19 +0530 Committer: Arnaldo Carvalho de Melo CommitDate: Tue, 5 Dec 2017 10:24:33 -0300 perf tools arm64: Add support for get_cpuid_str function. The get_cpuid_str function returns the MIDR string of the first online cpu from the range of cpus associated with the PMU CORE device. Signed-off-by: Ganapatrao Kulkarni Acked-by: Will Deacon Cc: Alexander Shishkin Cc: Catalin Marinas Cc: Ganapatrao Kulkarni Cc: Jayachandran C Cc: Jonathan Cameron Cc: Mark Rutland Cc: Peter Zijlstra Cc: Robert Richter Cc: Shaokun Zhang Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20171016183222.25750-3-ganapatrao.kulkarni@cavium.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/arch/arm64/util/Build | 1 + tools/perf/arch/arm64/util/header.c | 65 +++++++++++++++++++++++++++++++++++++ 2 files changed, 66 insertions(+) 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..534cd25 --- /dev/null +++ b/tools/perf/arch/arm64/util/header.c @@ -0,0 +1,65 @@ +#include +#include +#include +#include "header.h" + +#define MIDR "/regs/identification/midr_el1" +#define MIDR_SIZE 19 +#define MIDR_REVISION_MASK 0xf +#define MIDR_VARIANT_SHIFT 20 +#define MIDR_VARIANT_MASK (0xf << MIDR_VARIANT_SHIFT) + +char *get_cpuid_str(struct perf_pmu *pmu) +{ + char *buf = NULL; + char path[PATH_MAX]; + const char *sysfs = sysfs__mountpoint(); + int cpu; + u64 midr = 0; + struct cpu_map *cpus; + FILE *file; + + if (!sysfs || !pmu || !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_debug("fopen failed for file %s\n", path); + continue; + } + + if (!fgets(buf, MIDR_SIZE, file)) { + fclose(file); + continue; + } + fclose(file); + + /* Ignore/clear Variant[23:20] and + * Revision[3:0] of MIDR + */ + midr = strtoul(buf, NULL, 16); + midr &= (~(MIDR_VARIANT_MASK | MIDR_REVISION_MASK)); + scnprintf(buf, MIDR_SIZE, "0x%016lx", midr); + /* got midr break loop */ + break; + } + + if (!midr) { + pr_err("failed to get cpuid string for PMU %s\n", pmu->name); + free(buf); + buf = NULL; + } + + cpu_map__put(cpus); + return buf; +}