Re: [PATCH v4 05/11] coresight-tpdm: Add nodes to set trigger timestamp and type

[Tao Zhang <quic_taozha@quicinc.com>]

On 6/1/2023 5:05 PM, Suzuki K Poulose wrote:
> On 27/04/2023 10:00, 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@quicinc.com>
>> ---
>>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   | 24 ++++++
>>   drivers/hwtracing/coresight/coresight-tpdm.c       | 95 
>> ++++++++++++++++++++++
>>   2 files changed, 119 insertions(+)
>>
>> diff --git 
>> a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm 
>> b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> index 686bdde..77e67f2 100644
>> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> @@ -21,3 +21,27 @@ 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    6.3
>
> This would need updating. We are not sure if this can make it to 6.5, 
> with dependency on James' series. Fix this with 6.5 here and we can take
> a shot.
Sure, I will update this in the next patch series.
>
>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang 
>> (QUIC) <quic_taozha@quicinc.com>
>> +Description:
>> +        (Write) Set the trigger type of DSB tpdm. Read the trigger
>> +        type of DSB 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    6.3
>
> Same here
Sure, I will update this in the next patch series.
>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang 
>> (QUIC) <quic_taozha@quicinc.com>
>> +Description:
>> +        (Write) Set the trigger timestamp of DSB tpdm. Read the
>> +        trigger timestamp of DSB 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 2e64cfd..14f4352 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
>> @@ -20,6 +20,19 @@
>>     DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm");
>>   +static umode_t tpdm_dsb_is_visible(struct kobject *kobj,
>> +                                   struct attribute *attr, int n)
>
> minor nit: alignment ?
Sure, I will update this in the next patch series.
>
>> +{
>> +    struct device *dev = kobj_to_dev(kobj);
>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +
>> +    if (drvdata)
>> +        if (drvdata && (drvdata->datasets & TPDM_PIDR0_DS_DSB))
>> +            return attr->mode;
>
> Duplicate check for drvdata ?
>
>     if (drvdata && (drvdata->datasets & TPDM_PIDR0_DS_DSB))
>         return attr->mode;

Don't need double check here, I will change this in the next patch series.


Best,

Tao

>> +
>> +    return 0;
>> +}
>> +
>>   static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
>>   {
>>       if (drvdata->datasets & TPDM_PIDR0_DS_DSB) {
>> @@ -239,8 +252,90 @@ 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)
>> +{
>> +    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
>