linux-kernel - [PATCH v1 5/9] coresight-tpdm: Add nodes to set trigger timestamp and type

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Date:   Mon, 21 Nov 2022 16:21:09 +0800
From:   Tao Zhang <quic_taozha@...cinc.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Konrad Dybcio <konradybcio@...il.com>,
        Mike Leach <mike.leach@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     Tao Zhang <quic_taozha@...cinc.com>,
        Jinlong Mao <quic_jinlmao@...cinc.com>,
        Leo Yan <leo.yan@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <coresight@...ts.linaro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Hao Zhang <quic_hazha@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <bjorn.andersson@...aro.org>
Subject: [PATCH v1 5/9] coresight-tpdm: Add nodes to set trigger timestamp and type

The nodes are needed to set or show the trigger timestamp and
trigger type. This change is to add these nodes to achieve these
function.

Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
---
 drivers/hwtracing/coresight/coresight-tpdm.c | 97 ++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
index 5d5f442..35b328e 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -20,6 +20,22 @@
 
 DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm");
 
+static umode_t tpdm_dsb_is_visible(struct kobject *kobj,
+							struct attribute *attr, int n)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+	if (drvdata) {
+		if (drvdata->datasets & TPDM_PIDR0_DS_DSB)
+			return attr->mode;
+		else
+			return 0;
+	}
+
+	return 0;
+}
+
 static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
 {
 	u32 val;
@@ -241,8 +257,89 @@ static struct attribute_group tpdm_attr_grp = {
 	.attrs = tpdm_attrs,
 };
 
+static ssize_t dsb_trig_type_show(struct device *dev,
+				     struct device_attribute *attr,
+				     char *buf)
+{
+	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+	return sysfs_emit(buf, "%u\n",
+			 (unsigned int)drvdata->dsb->trig_type);
+}
+
+/*
+ * value 0: set trigger type as enablement
+ * value 1: set trigger type as disablement
+ */
+static ssize_t dsb_trig_type_store(struct device *dev,
+				      struct device_attribute *attr,
+				      const char *buf,
+				      size_t size)
+{
+	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+	unsigned long val;
+
+	if ((kstrtoul(buf, 0, &val)) || val < 0 || val > 1)
+		return -EINVAL;
+
+	spin_lock(&drvdata->spinlock);
+	if (val)
+		drvdata->dsb->trig_type = true;
+	else
+		drvdata->dsb->trig_type = false;
+	spin_unlock(&drvdata->spinlock);
+	return size;
+}
+static DEVICE_ATTR_RW(dsb_trig_type);
+
+static ssize_t dsb_trig_ts_show(struct device *dev,
+				     struct device_attribute *attr,
+				     char *buf)
+{
+	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+	return sysfs_emit(buf, "%u\n",
+			 (unsigned int)drvdata->dsb->trig_ts);
+}
+
+/*
+ * value 0: set trigger timestamp as enablement
+ * value 1: set trigger timestamp as disablement
+ */
+static ssize_t dsb_trig_ts_store(struct device *dev,
+				      struct device_attribute *attr,
+				      const char *buf,
+				      size_t size)
+{
+	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+	unsigned long val;
+
+	if ((kstrtoul(buf, 0, &val)) || val < 0 || val > 1)
+		return -EINVAL;
+
+	spin_lock(&drvdata->spinlock);
+	if (val)
+		drvdata->dsb->trig_ts = true;
+	else
+		drvdata->dsb->trig_ts = false;
+	spin_unlock(&drvdata->spinlock);
+	return size;
+}
+static DEVICE_ATTR_RW(dsb_trig_ts);
+static struct attribute *tpdm_dsb_attrs[] = {
+	&dev_attr_dsb_trig_ts.attr,
+	&dev_attr_dsb_trig_type.attr,
+	NULL,
+};
+
+static struct attribute_group tpdm_dsb_attr_grp = {
+	.attrs = tpdm_dsb_attrs,
+	.is_visible = tpdm_dsb_is_visible,
+};
+
 static const struct attribute_group *tpdm_attr_grps[] = {
 	&tpdm_attr_grp,
+	&tpdm_dsb_attr_grp,
 	NULL,
 };
 
-- 
2.7.4