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@xxxxxxxxxx> --- 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@xxxxxxxxxx> L: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx (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@xxxxxxxxxx> + * + * 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 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
