[PATCH v2 4/5] coresight-tnoc: add node to configure flag type

Yuanfang Zhang
2025-02-26T13:25:02Z

flag_type：used to set the type of issued ATB FLAG packets.
0: 'FLAG' packets; 1: 'FLAG_TS' packets.

Signed-off-by: Yuanfang Zhang <quic_yuanfang@quicinc.com>
---
drivers/hwtracing/coresight/coresight-tnoc.c | 42 +++++++++++++++++++++++++++-
1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-tnoc.c b/drivers/hwtracing/coresight/coresight-tnoc.c
index 20231f28ddcb6a60d9b3c1ca3e0ca4d731dac39c..ad973749250644760adc4dfd855240026d0a744c 100644
--- a/drivers/hwtracing/coresight/coresight-tnoc.c
+++ b/drivers/hwtracing/coresight/coresight-tnoc.c
@@ -26,7 +26,7 @@ static ssize_t flush_req_store(struct device *dev,
unsigned long val;
u32 reg;

- if (kstrtoul(buf, 10, &val))
+ if (kstrtoul(buf, 0, &val))
return -EINVAL;

if (val != 1)
@@ -73,9 +73,49 @@ static ssize_t flush_status_show(struct device *dev,
}
static DEVICE_ATTR_RO(flush_status);

+/*
+ * Sets the type of issued ATB FLAG packets:
+ * 0: 'FLAG' packets;
+ * 1: 'FLAG_TS' packets.
+ */
+static ssize_t flag_type_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t size)
+{
+ struct trace_noc_drvdata *drvdata = dev_get_drvdata(dev->parent);
+ unsigned long val;
+
+ if (kstrtoul(buf, 10, &val))
+ return -EINVAL;
+
+ if (val != 1 && val != 0)
+ return -EINVAL;
+
+ spin_lock(&drvdata->spinlock);
+ if (val)
+ drvdata->flag_type = FLAG_TS;
+ else
+ drvdata->flag_type = FLAG;
+ spin_unlock(&drvdata->spinlock);
+
+ return size;
+}
+
+static ssize_t flag_type_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct trace_noc_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+ return sysfs_emit(buf, "%u\n", drvdata->flag_type);
+}
+static DEVICE_ATTR_RW(flag_type);
+
static struct attribute *trace_noc_attrs[] = {
&dev_attr_flush_req.attr,
&dev_attr_flush_status.attr,
+ &dev_attr_flag_type.attr,
NULL,
};

--
2.34.1