Re: [PATCH v2 5/9] coresight-tpdm: Add nodes to set trigger timestamp and type

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Hi Suzuki,

在 2/28/2023 7:29 PM, Suzuki K Poulose 写道:
On 19/01/2023 07:41, Tao Zhang wrote:
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@xxxxxxxxxxx>
Signed-off-by: Tao Zhang <taozha@xxxxxxxxxxxxxxxx>
---
  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 c29d667d..1dbb6c4 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;
+    }

    if (drvdata && drvdata->dsb)
        return attr->mode;

    return 0;

?
Sure, I will update this in the next version of patch.


+
+    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)

val < 0 check here doesn't help on an unsigned variable.

may be (val & ~1UL) ?
Sure, I will update this in the next version of the patch.

+        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)

same here.

+        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,
  };


Suzuki

Best,

Tao




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