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Message-Id: <1442593594-10665-14-git-send-email-mathieu.poirier@linaro.org>
Date: Fri, 18 Sep 2015 10:26:27 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: gregkh@...uxfoundation.org, a.p.zijlstra@...llo.nl,
alexander.shishkin@...ux.intel.com, acme@...nel.org,
mingo@...hat.com, corbet@....net
Cc: adrian.hunter@...el.com, zhang.chunyan@...aro.org,
mike.leach@....com, tor@...com, al.grant@....com,
pawel.moll@....com, linux-arm-kernel@...ts.infradead.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 13/20] coresight: etm-perf: new PMU driver for ETM tracers
Perf is a well known and used tool for performance monitoring
and much more. A such it is an ideal condaditate for integration
with coresight based HW tracing.
This patch introduce a minimal PMU that represent a coresight
tracer to the Perf core.
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
MAINTAINERS | 1 +
drivers/hwtracing/coresight/Makefile | 2 +-
drivers/hwtracing/coresight/coresight-etm-perf.c | 65 ++++++++++++++++++++++++
include/linux/coresight-pmu.h | 18 +++++++
4 files changed, 85 insertions(+), 1 deletion(-)
create mode 100644 drivers/hwtracing/coresight/coresight-etm-perf.c
create mode 100644 include/linux/coresight-pmu.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 7ba7ab749c85..b462a90a256d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -989,6 +989,7 @@ ARM/CORESIGHT FRAMEWORK AND DRIVERS
M: Mathieu Poirier <mathieu.poirier@...aro.org>
L: linux-arm-kernel@...ts.infradead.org (moderated for non-subscribers)
S: Maintained
+F: include/linux/coresight*
F: drivers/hwtracing/coresight/*
F: Documentation/trace/coresight.txt
F: Documentation/devicetree/bindings/arm/coresight.txt
diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile
index 99f8e5f6256e..2ab2627060a4 100644
--- a/drivers/hwtracing/coresight/Makefile
+++ b/drivers/hwtracing/coresight/Makefile
@@ -1,7 +1,7 @@
#
# Makefile for CoreSight drivers.
#
-obj-$(CONFIG_CORESIGHT) += coresight.o
+obj-$(CONFIG_CORESIGHT) += coresight.o coresight-etm-perf.o
obj-$(CONFIG_OF) += of_coresight.o
obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o
obj-$(CONFIG_CORESIGHT_SINK_TPIU) += coresight-tpiu.o
diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c
new file mode 100644
index 000000000000..759b8d69b4e6
--- /dev/null
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.c
@@ -0,0 +1,65 @@
+/*
+ * Copyright(C) 2015 Linaro Limited. All rights reserved.
+ * Author: Mathieu Poirier <mathieu.poirier@...aro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/perf_event.h>
+#include <linux/mm.h>
+#include <linux/list.h>
+
+#include <linux/coresight.h>
+#include <linux/coresight-pmu.h>
+
+#include "coresight-priv.h"
+
+static struct pmu etm_pmu;
+
+/* ETMCR is 'config' */
+PMU_FORMAT_ATTR(cycacc, "config:12");
+PMU_FORMAT_ATTR(timestamp, "config:28");
+
+static struct attribute *etm_config_formats_attr[] = {
+ &format_attr_cycacc.attr,
+ &format_attr_timestamp.attr,
+ NULL,
+};
+
+static struct attribute_group etm_pmu_format_group = {
+ .name = "format",
+ .attrs = etm_config_formats_attr,
+};
+
+static const struct attribute_group *etm_pmu_attr_groups[] = {
+ &etm_pmu_format_group,
+ NULL,
+};
+
+static void etm_event_read(struct perf_event *event) {}
+
+static int __init etm_perf_init(void)
+{
+ etm_pmu.capabilities = PERF_PMU_CAP_EXCLUSIVE;
+
+ etm_pmu.attr_groups = etm_pmu_attr_groups;
+ etm_pmu.task_ctx_nr = perf_sw_context;
+ etm_pmu.read = etm_event_read;
+
+ return perf_pmu_register(&etm_pmu, CORESIGHT_ETM_PMU_NAME, -1);
+}
+module_init(etm_perf_init);
diff --git a/include/linux/coresight-pmu.h b/include/linux/coresight-pmu.h
new file mode 100644
index 000000000000..261361060f0b
--- /dev/null
+++ b/include/linux/coresight-pmu.h
@@ -0,0 +1,18 @@
+/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _LINUX_CORESIGHT_PMU_H
+#define _LINUX_CORESIGHT_PMU_H
+
+#define CORESIGHT_ETM_PMU_NAME "cs_etm"
+
+#endif
--
1.9.1
--
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