linux-kernel - [PATCH v4 08/10] coresight: add a new function in helper

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250725100806.1157-9-jie.gan@oss.qualcomm.com>
Date: Fri, 25 Jul 2025 18:08:04 +0800
From: Jie Gan <jie.gan@....qualcomm.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Tingwei Zhang <tingwei.zhang@....qualcomm.com>,
        Jinlong Mao <jinlong.mao@....qualcomm.com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, Jie Gan <quic_jiegan@...cinc.com>
Subject: [PATCH v4 08/10] coresight: add a new function in helper_ops

Add a new function to identifiy whether the byte-cntr function is
enabled or not in helper_ops.

The byte-cntr's read_ops is expected if the byte-cntr is enabled when
the user try to read trace data via sysfs node.

Signed-off-by: Jie Gan <jie.gan@....qualcomm.com>
---
 .../hwtracing/coresight/coresight-ctcu-core.c | 35 +++++++++++++++++++
 include/linux/coresight.h                     |  3 ++
 2 files changed, 38 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-ctcu-core.c b/drivers/hwtracing/coresight/coresight-ctcu-core.c
index 8fc08e42187e..dec911980939 100644
--- a/drivers/hwtracing/coresight/coresight-ctcu-core.c
+++ b/drivers/hwtracing/coresight/coresight-ctcu-core.c
@@ -234,9 +234,44 @@ static int ctcu_disable(struct coresight_device *csdev, void *data)
 	return ctcu_set_etr_traceid(csdev, path, false);
 }
 
+static bool ctcu_qcom_byte_cntr_in_use(struct coresight_device *csdev,
+				       void **data)
+{
+	struct ctcu_byte_cntr *byte_cntr_data;
+	struct coresight_device *helper;
+	struct ctcu_drvdata *drvdata;
+	int port;
+
+	if (!csdev)
+		return false;
+
+	helper = coresight_get_helper(csdev, CORESIGHT_DEV_SUBTYPE_HELPER_CTCU);
+	if (!helper)
+		return false;
+
+	port = coresight_get_in_port_dest(csdev, helper);
+	if (port < 0)
+		return false;
+
+	drvdata = dev_get_drvdata(helper->dev.parent);
+	/* Something wrong when initialize byte_cntr_read_ops */
+	if (!drvdata->byte_cntr_read_ops)
+		return false;
+
+	byte_cntr_data = &drvdata->byte_cntr_data[port];
+	/* Return the pointer of the ctcu_drvdata if byte-cntr has enabled */
+	if (byte_cntr_data && byte_cntr_data->thresh_val) {
+		*data = (void *)drvdata->byte_cntr_read_ops;
+		return true;
+	}
+
+	return false;
+}
+
 static const struct coresight_ops_helper ctcu_helper_ops = {
 	.enable = ctcu_enable,
 	.disable = ctcu_disable,
+	.qcom_byte_cntr_in_use = ctcu_qcom_byte_cntr_in_use,
 };
 
 static const struct coresight_ops ctcu_ops = {
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 4ac65c68bbf4..b5f052854b08 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -419,11 +419,14 @@ struct coresight_ops_source {
  *
  * @enable	: Enable the device
  * @disable	: Disable the device
+ * @qcom_byte_cntr_in_use:	check whether the byte-cntr is enabled.
  */
 struct coresight_ops_helper {
 	int (*enable)(struct coresight_device *csdev, enum cs_mode mode,
 		      void *data);
 	int (*disable)(struct coresight_device *csdev, void *data);
+	bool (*qcom_byte_cntr_in_use)(struct coresight_device *csdev,
+				      void **data);
 };
 
 
-- 
2.34.1