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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: Tao Zhang <quic_taozha@quicinc.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/1695882586-10306-7-git-send-email-quic_taozha@quicinc.com
This commit is contained in:
Tao Zhang 2023-09-28 14:29:39 +08:00 committed by Suzuki K Poulose
parent f01e4948b5
commit 8fbbce11a9
2 changed files with 32 additions and 0 deletions
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10
Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
View File

@ -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

22
drivers/hwtracing/coresight/coresight-tpdm.c
View File

@ -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,
};