[PATCH v8 07/13] coresight-tpdm: Add nodes to set trigger timestamp and type

[Tao Zhang]

On 9/1/2023 6:43 PM, Suzuki K Poulose wrote:
> On 22/08/2023 06:26, Tao Zhang wrote:
>> The nodes are needed to set or show the trigger timestamp and
>> trigger type. This change is to add these nodes to achieve these
>> function.
>>
>> Signed-off-by: Tao Zhang <quic_taozha at quicinc.com>
>> ---
>>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   | 22 +++++
>>   drivers/hwtracing/coresight/coresight-tpdm.c       | 95 
>> ++++++++++++++++++++++
>>   2 files changed, 117 insertions(+)
>>
>> diff --git 
>> a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm 
>> b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> index 2936226..9e26e30 100644
>> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> @@ -21,3 +21,25 @@ Description:
>>             Accepts only one value -  1.
>>           1 : Reset the dataset of the tpdm
>> +
>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_type
>> +Date:        March 2023
>> +KernelVersion    6.5
>
> 6.7
>
>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao at quicinc.com>, Tao Zhang 
>> (QUIC) <quic_taozha at quicinc.com>
>> +Description:
>> +        (RW) Set/Get the trigger type of the DSB for tpdm.
>> +
>> +        Accepts only one of the 2 values -  0 or 1.
>> +        0 : Set the DSB trigger type to false
>> +        1 : Set the DSB trigger type to true
>> +
>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_ts
>> +Date:        March 2023
>> +KernelVersion    6.5
>
> Same here
>
>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao at quicinc.com>, Tao Zhang 
>> (QUIC) <quic_taozha at quicinc.com>
>> +Description:
>> +        (RW) Set/Get the trigger timestamp of the DSB for tpdm.
>> +
>> +        Accepts only one of the 2 values -  0 or 1.
>> +        0 : Set the DSB trigger type to false
>> +        1 : Set the DSB trigger type to true
>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c 
>> b/drivers/hwtracing/coresight/coresight-tpdm.c
>> index d6e7c8c..8e11c9b 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
>> @@ -25,6 +25,18 @@ static bool tpdm_has_dsb_dataset(struct 
>> tpdm_drvdata *drvdata)
>>       return (drvdata->datasets & TPDM_PIDR0_DS_DSB);
>>   }
>>   +static umode_t tpdm_dsb_is_visible(struct kobject *kobj,
>> +                       struct attribute *attr, int n)
>
> minor nit: please align.
>
> static umode_t tpdm_dsb_is_visible(struct kobject *kobj,
>                    struct attribute *attr, int n)
>
> I don't know if you have a different setting for tabs in your editor.
> Please refer to the coding style document.

Tab size is set to 4 in my editor.

There are 5 tabs and 3 spaces at the beginning of this line.

I don't know if this is the same as what you see in this patch.

I see from the editor that the code meets the requirements of the coding 
style document.

If the gap in alignment is not resolved, such alignment problems may 
still occur.


Best,

Tao

>
>> +{
>> +    struct device *dev = kobj_to_dev(kobj);
>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +
>> +    if (drvdata && tpdm_has_dsb_dataset(drvdata))
>> +        return attr->mode;
>> +
>> +    return 0;
>> +}
>> +
>>   static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
>>   {
>>       if (tpdm_has_dsb_dataset(drvdata)) {
>> @@ -232,8 +244,91 @@ static struct attribute_group tpdm_attr_grp = {
>>       .attrs = tpdm_attrs,
>>   };
>>   +static ssize_t dsb_trig_type_show(struct device *dev,
>> +          struct device_attribute *attr, char *buf)
>
> same here.
>
>> +{
>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +
>> +    return sysfs_emit(buf, "%u\n",
>> +             (unsigned int)drvdata->dsb->trig_type);
>> +}
>> +
>> +/*
>> + * Trigger type (boolean):
>> + * false - Disable trigger type.
>> + * true  - Enable trigger type.
>> + */
>> +static ssize_t dsb_trig_type_store(struct device *dev,
>> +                      struct device_attribute *attr,
>> +                      const char *buf,
>> +                      size_t size)
>> +{
>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +    unsigned long val;
>> +
>> +    if ((kstrtoul(buf, 0, &val)) || (val & ~1UL))
>> +        return -EINVAL;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    if (val)
>> +        drvdata->dsb->trig_type = true;
>> +    else
>> +        drvdata->dsb->trig_type = false;
>> +    spin_unlock(&drvdata->spinlock);
>> +    return size;
>> +}
>> +static DEVICE_ATTR_RW(dsb_trig_type);
>> +
>> +static ssize_t dsb_trig_ts_show(struct device *dev,
>> +                    struct device_attribute *attr,
>> +                    char *buf)
>> +{
>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +
>> +    return sysfs_emit(buf, "%u\n",
>> +             (unsigned int)drvdata->dsb->trig_ts);
>> +}
>> +
>> +/*
>> + * Trigger timestamp (boolean):
>> + * false - Disable trigger timestamp.
>> + * true  - Enable trigger timestamp.
>> + */
>> +static ssize_t dsb_trig_ts_store(struct device *dev,
>> +                   struct device_attribute *attr,
>> +                   const char *buf,
>> +                   size_t size)
>> +{
>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +    unsigned long val;
>> +
>> +    if ((kstrtoul(buf, 0, &val)) || (val & ~1UL))
>> +        return -EINVAL;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    if (val)
>> +        drvdata->dsb->trig_ts = true;
>> +    else
>> +        drvdata->dsb->trig_ts = false;
>> +    spin_unlock(&drvdata->spinlock);
>> +    return size;
>> +}
>> +static DEVICE_ATTR_RW(dsb_trig_ts);
>> +
>> +static struct attribute *tpdm_dsb_attrs[] = {
>> +    &dev_attr_dsb_trig_ts.attr,
>> +    &dev_attr_dsb_trig_type.attr,
>> +    NULL,
>> +};
>> +
>> +static struct attribute_group tpdm_dsb_attr_grp = {
>> +    .attrs = tpdm_dsb_attrs,
>> +    .is_visible = tpdm_dsb_is_visible,
>> +};
>> +
>>   static const struct attribute_group *tpdm_attr_grps[] = {
>>       &tpdm_attr_grp,
>> +    &tpdm_dsb_attr_grp,
>>       NULL,
>>   };
>
> Rest looks fine to me
>
> Suzuki
>