On 8/9/2023 2:35 PM, Tao Zhang wrote:
On 8/7/2023 5:36 PM, Suzuki K Poulose wrote:
On 25/07/2023 08:15, Tao Zhang wrote:Sure, I will update this in the next patch series.
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..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@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
+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 ?
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)
Best,
Tao
Hi Suzuki,
With regards to the parameters alignment for the function, could you
kindly remind me the rule of alignment? I'm using the thunderbird
mail client and I'm not sure if the alignment I see is what you expect.
If the rule can be specified, I can align all the function parameters in
this patch series according to this rule.
Best,
Tao
Hi Suzuki,
Can I follow the following rules to handle the similar case?
"Descendants are always substantially shorter than the parent and are placed substantially to the right.
A very commonly used style is to align descendants to a function open parenthesis."
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
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