Commit 8fbbce11 authored by Tao Zhang's avatar Tao Zhang Committed by Suzuki K Poulose
Browse files

coresight-tpdm: Add reset node to TPDM node 



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: default avatarTao Zhang <quic_taozha@quicinc.com>
Signed-off-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/1695882586-10306-7-git-send-email-quic_taozha@quicinc.com
parent f01e4948

Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm

+10 −0
Original line number Diff line number Diff line
@@ -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	6.7

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 tpdm

drivers/hwtracing/coresight/coresight-tpdm.c

+22 −0
Original line number Diff line number Diff line
@@ -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,

	&dev_attr_integration_test.attr,

	NULL,

};