From patchwork Mon Nov 23 18:33:06 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathieu Poirier X-Patchwork-Id: 7685351 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 851C6BF90C for ; Mon, 23 Nov 2015 18:51:24 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9BC49206C3 for ; Mon, 23 Nov 2015 18:51:23 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A3EF8206CD for ; Mon, 23 Nov 2015 18:51:22 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1a0wB3-0007tx-5Q; Mon, 23 Nov 2015 18:49:25 +0000 Received: from mail-pa0-x234.google.com ([2607:f8b0:400e:c03::234]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1a0vwn-0000Et-KT for linux-arm-kernel@lists.infradead.org; Mon, 23 Nov 2015 18:34:44 +0000 Received: by pacej9 with SMTP id ej9so198771348pac.2 for ; Mon, 23 Nov 2015 10:34:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro-org.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=vNXwL1Vmvy6gRlkIM0ym8VMaudelNbiYK08V5ksvWu8=; b=c2Kebz4PWTPGXW+T5UcD7j+WsSPPupyxl9t4Kdl/uqOhZ3QqVx4wF6y/8dqF+WBV1F uw4R6QOlAvYeE4OavNHJ/Ajs4Fe4VVLG9+dNvpBtA382SZSHJE/XOB6VxV+FL7jmrM+M FlWiJtlcDfynl1szIJ6mMawwDhA/pJ2Qv63F1Ds7RAsxNWQzOR5KkSGGTBrkFLo+YhGz g+1UcHJUku/AdiJs3F6ZPSdbuLA6SKgXPAq9cLwOHMbJ1hzCWFA9hAkH0k7Er9kYHq+0 NEcu897Ht8ivdQT1u7jbAl1HJKOYtjiZXil6A+Ns8xasb2hHmCUYFv5AVhtkI8xwakcd o1tg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=vNXwL1Vmvy6gRlkIM0ym8VMaudelNbiYK08V5ksvWu8=; b=j26XxZemJb+qiXtWdW0qRPi/FWet8el1+RNIrHXEG4GB0eLrNUZOKhLR3T0GCGD3BL UYwaUCPwoWW46Eyu2aQ5l2EGpEWw5plTkg0vgOkqaSwy2Wp1J6lfYovDbHzQSfPwNi6j iKzn0xzH3Ds+Sm8MVblR4Wm3CljZq5+NuaIeXVv21P/Ht2IlWr/FNQH+TFmQJd63WxG9 j5JWM/ESmEdBk+7d8jU3ZjY2UTA9I26vdWeTLjZtbZ493liKASR8e0QTprR/xVQUCYUp +rGrZ2KAdbzXw1CMZ5kq36FgwQswBs+1doqiFXt8a40OghZq1ajHLvBjcukXR97jzhwb H5aA== X-Gm-Message-State: ALoCoQlU4EiPXdGKaZPeU1E19StcdRCzN3ZRXjvaQxih4nMAxoSgppBQnn3iaxIrCw4tFyYuuTup X-Received: by 10.68.143.40 with SMTP id sb8mr31005130pbb.29.1448303660839; Mon, 23 Nov 2015 10:34:20 -0800 (PST) Received: from t430.cg.shawcable.net ([184.64.168.246]) by smtp.gmail.com with ESMTPSA id r20sm10865186pfa.93.2015.11.23.10.34.19 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 23 Nov 2015 10:34:20 -0800 (PST) From: Mathieu Poirier To: gregkh@linuxfoundation.org, a.p.zijlstra@chello.nl, alexander.shishkin@linux.intel.com, acme@kernel.org, mingo@redhat.com, corbet@lwn.net, nicolas.pitre@linaro.org Subject: [RESEND PATCH V4 14/26] coresight: etm3x: adding perf_get/set_config() API Date: Mon, 23 Nov 2015 11:33:06 -0700 Message-Id: <1448303598-11249-15-git-send-email-mathieu.poirier@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1448303598-11249-1-git-send-email-mathieu.poirier@linaro.org> References: <1448303598-11249-1-git-send-email-mathieu.poirier@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151123_103442_021366_CBC70618 X-CRM114-Status: GOOD ( 20.35 ) X-Spam-Score: -2.6 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: al.grant@arm.com, pawel.moll@arm.com, linux-doc@vger.kernel.org, fainelli@broadcom.com, linux-kernel@vger.kernel.org, tor@ti.com, mike.leach@arm.com, zhang.chunyan@linaro.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.7 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Adding a source operation to build a tracer's configuration from a perf_event. That way possibly complex parsing of the information conveyed by the event doesn't have to be carried out every time the configuration is needed. Since event configuration can change between concurrent sessions, the possibility of associating a tracer with a configuration is also provided. As such Perf can assign session configuration to tracers as it see fit. Signed-off-by: Mathieu Poirier --- drivers/hwtracing/coresight/Kconfig | 1 + drivers/hwtracing/coresight/coresight-etm3x.c | 62 +++++++++++++++++++++++++++ include/linux/coresight.h | 7 ++- 3 files changed, 69 insertions(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig index 6c8921140f02..e252dd1522e5 100644 --- a/drivers/hwtracing/coresight/Kconfig +++ b/drivers/hwtracing/coresight/Kconfig @@ -4,6 +4,7 @@ menuconfig CORESIGHT bool "CoreSight Tracing Support" select ARM_AMBA + select PERF_EVENTS help This framework provides a kernel interface for the CoreSight debug and trace drivers to register themselves with. It's intended to build diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c index a83c67d13b21..dd319ef0f1ac 100644 --- a/drivers/hwtracing/coresight/coresight-etm3x.c +++ b/drivers/hwtracing/coresight/coresight-etm3x.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include "coresight-etm.h" @@ -315,6 +316,40 @@ void etm_config_trace_mode(struct etm_drvdata *drvdata, config->addr_type[1] = ETM_ADDR_TYPE_RANGE; } +#define ETM3X_SUPPORTED_OPTIONS (ETMCR_CYC_ACC | ETMCR_TIMESTAMP_EN) + +static int etm_parse_event_config(struct etm_drvdata *drvdata, + struct etm_config *config, + struct perf_event *event) +{ + u32 mode = 0; + u64 event_config = event->attr.config; + + if (event->attr.exclude_kernel) + mode = ETM_MODE_EXCL_KERN; + + if (event->attr.exclude_user) + mode = ETM_MODE_EXCL_USER; + + /* + * By default the tracers are configured to trace the whole address + * range. Narrow the field only if requested by user space. + */ + if (mode) + etm_config_trace_mode(drvdata, config, mode); + + /* + * At this time only cycle accurate and timestamp options are + * available. + */ + if (event_config & ~ETM3X_SUPPORTED_OPTIONS) + return -EINVAL; + + config->ctrl = event_config; + + return 0; +} + static void etm_enable_hw(void *info) { int i; @@ -428,6 +463,31 @@ static int etm_trace_id(struct coresight_device *csdev) return etm_get_trace_id(drvdata); } +static void *etm_get_config(struct coresight_device *csdev, + struct perf_event *event) +{ + struct etm_config *config = NULL; + struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + config = kzalloc(sizeof(struct etm_config), GFP_KERNEL); + if (!config) + return config; + + etm_set_default(config); + + if (etm_parse_event_config(drvdata, config, event)) + return ERR_PTR(-EINVAL); + + return config; +} + +static void etm_set_config(struct coresight_device *csdev, void *config) +{ + struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + drvdata->config = config; +} + static int etm_enable_sysfs(struct coresight_device *csdev) { struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); @@ -568,6 +628,8 @@ static void etm_disable(struct coresight_device *csdev) static const struct coresight_ops_source etm_source_ops = { .cpu_id = etm_cpu_id, .trace_id = etm_trace_id, + .get_config = etm_get_config, + .set_config = etm_set_config, .enable = etm_enable, .disable = etm_disable, }; diff --git a/include/linux/coresight.h b/include/linux/coresight.h index 61dfb8d511ea..f2148bc2bcfe 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -206,13 +206,18 @@ struct coresight_ops_link { * @cpu_id: returns the value of the CPU number this component * is associated to. * @trace_id: returns the value of the component's trace ID as known - to the HW. + * to the HW. + * @get_config: builds the ETM configuration after events' specifics. + * @set_config: associate a tracer with a configuration. * @enable: enables tracing for a source. * @disable: disables tracing for a source. */ struct coresight_ops_source { int (*cpu_id)(struct coresight_device *csdev); int (*trace_id)(struct coresight_device *csdev); + void *(*get_config)(struct coresight_device *csdev, + struct perf_event *event); + void (*set_config)(struct coresight_device *csdev, void *config); int (*enable)(struct coresight_device *csdev, u32 mode); void (*disable)(struct coresight_device *csdev); };