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Message-ID: <1692681973-20764-8-git-send-email-quic_taozha@quicinc.com>
Date: Tue, 22 Aug 2023 13:26:07 +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>, <andersson@...nel.org>
Subject: [PATCH v8 07/13] 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>
---
.../ABI/testing/sysfs-bus-coresight-devices-tpdm | 22 +++++
drivers/hwtracing/coresight/coresight-tpdm.c | 95 ++++++++++++++++++++++
2 files changed, 117 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
index 2936226..9e26e30 100644
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
@@ -21,3 +21,25 @@ Description:
Accepts only one value - 1.
1 : Reset the dataset of the tpdm
+
+What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_type
+Date: March 2023
+KernelVersion 6.5
+Contact: Jinlong Mao (QUIC) <quic_jinlmao@...cinc.com>, Tao Zhang (QUIC) <quic_taozha@...cinc.com>
+Description:
+ (RW) Set/Get the trigger type of the DSB for tpdm.
+
+ Accepts only one of the 2 values - 0 or 1.
+ 0 : Set the DSB trigger type to false
+ 1 : Set the DSB trigger type to true
+
+What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_ts
+Date: March 2023
+KernelVersion 6.5
+Contact: Jinlong Mao (QUIC) <quic_jinlmao@...cinc.com>, Tao Zhang (QUIC) <quic_taozha@...cinc.com>
+Description:
+ (RW) Set/Get the trigger timestamp of the DSB for tpdm.
+
+ Accepts only one of the 2 values - 0 or 1.
+ 0 : Set the DSB trigger type to false
+ 1 : Set the DSB trigger type to true
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
index d6e7c8c..8e11c9b 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -25,6 +25,18 @@ static bool tpdm_has_dsb_dataset(struct tpdm_drvdata *drvdata)
return (drvdata->datasets & TPDM_PIDR0_DS_DSB);
}
+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 && tpdm_has_dsb_dataset(drvdata))
+ return attr->mode;
+
+ return 0;
+}
+
static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
{
if (tpdm_has_dsb_dataset(drvdata)) {
@@ -232,8 +244,91 @@ 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);
+}
+
+/*
+ * Trigger type (boolean):
+ * false - Disable trigger type.
+ * true - Enable trigger type.
+ */
+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 & ~1UL))
+ 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);
+}
+
+/*
+ * Trigger timestamp (boolean):
+ * false - Disable trigger timestamp.
+ * true - Enable trigger timestamp.
+ */
+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 & ~1UL))
+ 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
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