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

Tao Zhang
2022-11-21T08:24:41Z

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@quicinc.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