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Message-ID: <90beb51a-27fc-ef16-88cb-07a4b4ec06e4@arm.com>
Date:   Fri, 1 Sep 2023 11:43:21 +0100
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Subject: Re: [PATCH v8 07/13] coresight-tpdm: Add nodes to set trigger
 timestamp and type
To:     Tao Zhang <quic_taozha@quicinc.com>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Konrad Dybcio <konradybcio@gmail.com>,
        Mike Leach <mike.leach@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
Cc:     Jinlong Mao <quic_jinlmao@quicinc.com>,
        Leo Yan <leo.yan@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        Tingwei Zhang <quic_tingweiz@quicinc.com>,
        Yuanfang Zhang <quic_yuanfang@quicinc.com>,
        Trilok Soni <quic_tsoni@quicinc.com>,
        Hao Zhang <quic_hazha@quicinc.com>,
        linux-arm-msm@vger.kernel.org, andersson@kernel.org
References: <1692681973-20764-1-git-send-email-quic_taozha@quicinc.com>
 <1692681973-20764-8-git-send-email-quic_taozha@quicinc.com>
From:   Suzuki K Poulose <suzuki.poulose@arm.com>
In-Reply-To: <1692681973-20764-8-git-send-email-quic_taozha@quicinc.com>
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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@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@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@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@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@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.

> +{
> +	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