From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754204AbbIRQd6 (ORCPT ); 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 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 List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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); -- 1.9.1