On 8/7/2023 5:36 PM, Suzuki K Poulose wrote:
On 25/07/2023 08:15, Tao Zhang wrote:
TPDM device need a node to reset the configurations and status of
it. This change provides a node to reset the configurations and
disable the TPDM if it has been enabled.
Signed-off-by: Tao Zhang <quic_taozha@xxxxxxxxxxx>
---
.../ABI/testing/sysfs-bus-coresight-devices-tpdm | 10 ++++++++++
drivers/hwtracing/coresight/coresight-tpdm.c | 22
++++++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git
a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
index 4a58e64..dbc2fbd0 100644
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
@@ -11,3 +11,13 @@ Description:
Accepts only one of the 2 values - 1 or 2.
1 : Generate 64 bits data
2 : Generate 32 bits data
+
+What: /sys/bus/coresight/devices/<tpdm-name>/reset
+Date: March 2023
+KernelVersion 6.5
+Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Tao Zhang
(QUIC) <quic_taozha@xxxxxxxxxxx>
+Description:
+ (Write) Reset the dataset of the tpdm, and disable the tpdm.
Please fix this, we don't disable TPDM. If it only ever resets the
datasets, please could we rename this as such ?
i.e., reset_dataset or reset_dsb_data ?
Sure, I will update this in the next patch series.
+
+ Accepts only one value - 1.
+ 1 : Reset the dataset of the tpdm
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c
b/drivers/hwtracing/coresight/coresight-tpdm.c
index 52aa48a6..acc3eea 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -159,6 +159,27 @@ static int tpdm_datasets_setup(struct
tpdm_drvdata *drvdata)
return 0;
}
+static ssize_t reset_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t size)
Minor nit: alignment ? Could we have something like :
static ssize_t reset_store(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t size)
I will update this in the next patch series.
Best,
Tao
+{
+ int ret = 0;
+ unsigned long val;
+ struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+ ret = kstrtoul(buf, 10, &val);
+ if (ret || val != 1)
+ return -EINVAL;
+
+ spin_lock(&drvdata->spinlock);
+ tpdm_reset_datasets(drvdata);
+ spin_unlock(&drvdata->spinlock);
+
+ return size;
+}
+static DEVICE_ATTR_WO(reset);
+
/*
* value 1: 64 bits test data
* value 2: 32 bits test data
@@ -199,6 +220,7 @@ static ssize_t integration_test_store(struct
device *dev,
static DEVICE_ATTR_WO(integration_test);
static struct attribute *tpdm_attrs[] = {
+ &dev_attr_reset.attr,
&dev_attr_integration_test.attr,
NULL,
};
Suzuki
