On 22/08/2023 06:26, 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@quicinc.com
.../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..2936226 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_dataset +Date: March 2023 +KernelVersion 6.5 +Contact: Jinlong Mao (QUIC) quic_jinlmao@quicinc.com, Tao Zhang (QUIC) quic_taozha@quicinc.com +Description:
(Write) Reset the dataset of the tpdm.Accepts only one value - 1.1 : Reset the dataset of the tpdmdiff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c index 951ad4d..d6e7c8c 100644 --- a/drivers/hwtracing/coresight/coresight-tpdm.c +++ b/drivers/hwtracing/coresight/coresight-tpdm.c @@ -162,6 +162,27 @@ static int tpdm_datasets_setup(struct tpdm_drvdata *drvdata) return 0; } +static ssize_t reset_dataset_store(struct device *dev,
struct device_attribute *attr,const char *buf,size_t size)+{
- int ret = 0;
- unsigned long val;
- struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
- ret = kstrtoul(buf, 0, &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_dataset);
- /*
- value 1: 64 bits test data
- value 2: 32 bits test data
@@ -202,6 +223,7 @@ static ssize_t integration_test_store(struct device *dev, static DEVICE_ATTR_WO(integration_test); static struct attribute *tpdm_attrs[] = {
- &dev_attr_reset_dataset.attr,
Should this be only visible when DSB data set is present ?
Suzuki
&dev_attr_integration_test.attr, NULL, };