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[209.132.180.67]) by mx.google.com with ESMTP id 90si7536808ioq.190.2015.09.18.09.34.01; Fri, 18 Sep 2015 09:34:01 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754403AbbIRQd6 (ORCPT + 30 others); Fri, 18 Sep 2015 12:33:58 -0400 Received: from mail-pa0-f45.google.com ([209.85.220.45]:34693 "EHLO mail-pa0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754597AbbIRQ1I (ORCPT ); Fri, 18 Sep 2015 12:27:08 -0400 Received: by padhy16 with SMTP id hy16so55267628pad.1 for ; Fri, 18 Sep 2015 09:27:07 -0700 (PDT) X-Received: by 10.66.131.10 with SMTP id oi10mr8134203pab.87.1442593624854; Fri, 18 Sep 2015 09:27:04 -0700 (PDT) Received: from t430.cg.shawcable.net ([184.64.168.246]) by smtp.gmail.com with ESMTPSA id la4sm9847027pbc.76.2015.09.18.09.27.03 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 18 Sep 2015 09:27:04 -0700 (PDT) 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 Cc: adrian.hunter@intel.com, zhang.chunyan@linaro.org, mike.leach@arm.com, tor@ti.com, al.grant@arm.com, pawel.moll@arm.com, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 02/20] coresight: etm3x: implementing 'is_enabled()' API Date: Fri, 18 Sep 2015 10:26:16 -0600 Message-Id: <1442593594-10665-3-git-send-email-mathieu.poirier@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1442593594-10665-1-git-send-email-mathieu.poirier@linaro.org> References: <1442593594-10665-1-git-send-email-mathieu.poirier@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: list List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: mathieu.poirier@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.217.172 as permitted sender) smtp.mailfrom=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , Adding an interface to lookup the status of a tracer along with a source operation allowing external customers to access it. Signed-off-by: Mathieu Poirier --- drivers/hwtracing/coresight/coresight-etm3x.c | 13 +++++++++++++ include/linux/coresight.h | 2 ++ 2 files changed, 15 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c index 999c62a59c70..a44bc3532585 100644 --- a/drivers/hwtracing/coresight/coresight-etm3x.c +++ b/drivers/hwtracing/coresight/coresight-etm3x.c @@ -374,6 +374,18 @@ static int etm_configure(struct coresight_device *csdev) etm_configure_cpu, csdev, 1); } +static bool etm_is_enabled(struct coresight_device *csdev) +{ + bool enabled; + struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + spin_lock(&drvdata->spinlock); + enabled = drvdata->enable; + spin_unlock(&drvdata->spinlock); + + return enabled; +} + /** * etm_trace_enable - enable ETM tracer * @csdev - the etm that needs to be enabled/disabled. @@ -525,6 +537,7 @@ static void etm_disable(struct coresight_device *csdev) static const struct coresight_ops_source etm_source_ops = { .trace_id = etm_trace_id, + .is_enabled = etm_is_enabled, .configure = etm_configure, .trace_enable = etm_trace_enable, .enable = etm_enable, diff --git a/include/linux/coresight.h b/include/linux/coresight.h index 70f3dafa5194..d16e874079b7 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -207,6 +207,7 @@ struct coresight_ops_link { * Operations available for sources. * @trace_id: returns the value of the component's trace ID as known * to the HW. + * @is_enabled: returns whether a source has been enabled or not. * @configure: performs configuration for a source but doesn't enable it. * @trace_enable: enable/disable tracing on a source. * @enable: enables tracing for a source. @@ -216,6 +217,7 @@ struct coresight_ops_link { */ struct coresight_ops_source { int (*trace_id)(struct coresight_device *csdev); + bool (*is_enabled)(struct coresight_device *csdev); int (*configure)(struct coresight_device *csdev); int (*trace_enable)(struct coresight_device *csdev, bool enable); int (*enable)(struct coresight_device *csdev);