Re: [PATCH v7 04/13] coresight-tpda: Add DSB dataset support

Re: [PATCH v7 04/13] coresight-tpda: Add DSB dataset support

[Suzuki K Poulose]

On 25/07/2023 08:15, Tao Zhang wrote:
> Read the DSB element size from the device tree. Set the register
> bit that controls the DSB element size of the corresponding port.
> 
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> ---
>   drivers/hwtracing/coresight/coresight-tpda.c | 96 +++++++++++++++++++++++++---
>   drivers/hwtracing/coresight/coresight-tpda.h |  4 ++
>   2 files changed, 90 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
> index 8d2b9d2..7c71342 100644
> --- a/drivers/hwtracing/coresight/coresight-tpda.c
> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
> @@ -21,6 +21,58 @@
>   
>   DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda");
>   
> +/* Search and read element data size from the TPDM node in

minor nit:

/*
  * Search ...

> + * the devicetree. Each input port of TPDA is connected to
> + * a TPDM. Different TPDM supports different types of dataset,
> + * and some may support more than one type of dataset.
> + * Parameter "inport" is used to pass in the input port number
> + * of TPDA, and it is set to 0 in the recursize call.

> + * Parameter "parent" is used to pass in the original call.

Please remove references to the past and describe "match_inport"

> + */
> +static int tpda_set_element_size(struct tpda_drvdata *drvdata,
> +			   struct coresight_device *csdev, int inport, bool match_inport)

May be we could switch the order of the parameters:

match_inport, int port

Or even inport < 0, implies, port wont be matched.

i.e.,

tpda_set_element_size(drvdata, child, inport)

> +{
> +	static int nr_inport;
> +	int i;
> +	static bool tpdm_found;
> +	struct coresight_device *in_csdev;
> +
> +	if (inport > (TPDA_MAX_INPORTS - 1))
> +		return -EINVAL;
> +
> +	if (match_inport) {
> +		nr_inport = inport;
> +		tpdm_found = false;
> +	}

Could we not avoid the static variables and this dance by making the 
function return the dsb_size ? See further down.


> +
> +	for (i = 0; i < csdev->pdata->nr_inconns; i++) {
> +		in_csdev = csdev->pdata->in_conns[i]->src_dev;
> +		if (!in_csdev)
> +			break;
		continue ?
> +
> +		if (match_inport)
> +			if (csdev->pdata->in_conns[i]->dest_port != inport)
> +				continue;
> +
> +		if ((in_csdev->type == CORESIGHT_DEV_TYPE_SOURCE) &&
> +				(in_csdev->subtype.source_subtype
> +				== CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM)) {

Please provide a helper :

static bool coresight_device_is_tpdm(csdev) {
	return
	 (csdev->type == CORESIGHT_DEV_TYPE_SOURCE) &&
	 (in_csdev->subtype.source_subtype ==
		CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
}



> +			of_property_read_u8(in_csdev->dev.parent->of_node,
> +					"qcom,dsb-element-size", &drvdata->dsb_esize[nr_inport]);



> +			if (!tpdm_found)
> +				tpdm_found = true;
> +			else
> +				dev_warn(drvdata->dev,
> +					"More than one TPDM is mapped to the TPDA input port %d.\n",
> +					nr_inport);
> +			continue;
> +		}
> +		tpda_set_element_size(drvdata, in_csdev, 0, false);
> +	}
> +

/*
  * Read the DSB element size from the TPDM device
  * Returns
  *	the size read from the firmware if available.
  *	0 - Otherwise, with a Warning once.
  */
static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
{
	int rc, size = 0;

	rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
				     "qcom,dsb-element-size", &size);
	if (rc)
		dev_warn_once(&in->dev, "Failed to read TPDM DSB Element size: %d\n",
		rc);
	return size;
}

static int tpda_get_element_size(struct coresight_device *csdev,
				 int inport)
{
	int dsb_size = -ENOENT;

	for (i = 0; i < csdev->pdata->nr_inconns; i++) {
		in = csdev->pdata->in_conns[i]->src_dev;
		if (!in)
			continue;
		if (coresight_device_is_tpdm(in)) {
			/* Ignore the TPDMs that do not match port */
			if (inport > 0 &&
			    (csdev->pdata->in_conns[i]->dest_port !=
			    inport))
				continue;
			size = tpdm_read_dsb_element_size(csdev);
		} else {
			/* Recurse down the path */
			size = tpda_set_element_size(in, -1);
		}

		if (size < 0)
			return size;
		/* We have found a size, save it. */
		if (dsb_size < 0) {
			dsb_size = size;
		} else {
			/* We have duplicate TPDMs */
			return -EEXIST;
		}
	}
	return dsb_size;
}




> +	return 0;
> +}
> +
>   /* Settings pre enabling port control register */
>   static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
>   {
> @@ -32,26 +84,43 @@ static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
>   	writel_relaxed(val, drvdata->base + TPDA_CR);
>   }
>   
> -static void tpda_enable_port(struct tpda_drvdata *drvdata, int port)
> +static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>   {
>   	u32 val;
>   
>   	val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
> +	/*
> +	 * Configure aggregator port n DSB data set element size
> +	 * Set the bit to 0 if the size is 32
> +	 * Set the bit to 1 if the size is 64
> +	 */
> +	if (drvdata->dsb_esize[port] == 32)
> +		val &= ~TPDA_Pn_CR_DSBSIZE;
> +	else if (drvdata->dsb_esize[port] == 64)
> +		val |= TPDA_Pn_CR_DSBSIZE;

Couldn't this be detected via tpda_get_element_size()? see below.

> +	else
> +		return -EINVAL;
> +
>   	/* Enable the port */
>   	val |= TPDA_Pn_CR_ENA;
>   	writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
> +
> +	return 0;
>   }
>   
> -static void __tpda_enable(struct tpda_drvdata *drvdata, int port)
> +static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
>   {
> +	int ret;
> +
>   	CS_UNLOCK(drvdata->base);
>   
>   	if (!drvdata->csdev->enable)
>   		tpda_enable_pre_port(drvdata);
>   
> -	tpda_enable_port(drvdata, port);
> -
> +	ret = tpda_enable_port(drvdata, port);
>   	CS_LOCK(drvdata->base);
> +
> +	return ret;
>   }
>   
>   static int tpda_enable(struct coresight_device *csdev,
> @@ -59,16 +128,23 @@ static int tpda_enable(struct coresight_device *csdev,
>   		       struct coresight_connection *out)
>   {
>   	struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> +	int ret;
> +
> +	ret = tpda_set_element_size(drvdata, csdev, in->dest_port, true);

	size  = tpda_get_element_size(csdev, in->dest_port);
	switch (size) {
	case 32:
	case 64:
		break;
	case -EEXIST:
		dev_warn_once("Detected multiple TPDMs on port %d", ..)
		fallthrough;
	default:
		return size;
	}

	drvdata->dsb_esize[in->dest_port] = size;

Suzuki



> +	if (ret)
> +		return ret;
>   
>   	spin_lock(&drvdata->spinlock);
> -	if (atomic_read(&in->dest_refcnt) == 0)
> -		__tpda_enable(drvdata, in->dest_port);
> +	if (atomic_read(&in->dest_refcnt) == 0) {
> +		ret = __tpda_enable(drvdata, in->dest_port);
> +		if (!ret) {
> +			atomic_inc(&in->dest_refcnt);
> +			dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port);
> +		}
> +	}
>   
> -	atomic_inc(&in->dest_refcnt);
>   	spin_unlock(&drvdata->spinlock);
> -
> -	dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port);
> -	return 0;
> +	return ret;
>   }
>   
>   static void __tpda_disable(struct tpda_drvdata *drvdata, int port)
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h
> index 0399678..12a1472 100644
> --- a/drivers/hwtracing/coresight/coresight-tpda.h
> +++ b/drivers/hwtracing/coresight/coresight-tpda.h
> @@ -10,6 +10,8 @@
>   #define TPDA_Pn_CR(n)		(0x004 + (n * 4))
>   /* Aggregator port enable bit */
>   #define TPDA_Pn_CR_ENA		BIT(0)
> +/* Aggregator port DSB data set element size bit */
> +#define TPDA_Pn_CR_DSBSIZE		BIT(8)
>   
>   #define TPDA_MAX_INPORTS	32
>   
> @@ -23,6 +25,7 @@
>    * @csdev:      component vitals needed by the framework.
>    * @spinlock:   lock for the drvdata value.
>    * @enable:     enable status of the component.
> + * @dsb_esize:  DSB element size for each inport, it must be 32 or 64.
>    */
>   struct tpda_drvdata {
>   	void __iomem		*base;
> @@ -30,6 +33,7 @@ struct tpda_drvdata {
>   	struct coresight_device	*csdev;
>   	spinlock_t		spinlock;
>   	u8			atid;
> +	u8			dsb_esize[TPDA_MAX_INPORTS];
>   };
>   
>   #endif  /* _CORESIGHT_CORESIGHT_TPDA_H */


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Re: [PATCH v7 04/13] coresight-tpda: Add DSB dataset support

[Suzuki K Poulose]

On 04/08/2023 16:02, Suzuki K Poulose wrote:
> On 25/07/2023 08:15, Tao Zhang wrote:
>> Read the DSB element size from the device tree. Set the register
>> bit that controls the DSB element size of the corresponding port.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-tpda.c | 96 
>> +++++++++++++++++++++++++---
>>   drivers/hwtracing/coresight/coresight-tpda.h |  4 ++
>>   2 files changed, 90 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c 
>> b/drivers/hwtracing/coresight/coresight-tpda.c
>> index 8d2b9d2..7c71342 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>> @@ -21,6 +21,58 @@
>>   DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda");
>> +/* Search and read element data size from the TPDM node in
> 
> minor nit:
> 
> /*
>   * Search ...
> 
>> + * the devicetree. Each input port of TPDA is connected to
>> + * a TPDM. Different TPDM supports different types of dataset,
>> + * and some may support more than one type of dataset.
>> + * Parameter "inport" is used to pass in the input port number
>> + * of TPDA, and it is set to 0 in the recursize call.
> 
>> + * Parameter "parent" is used to pass in the original call.
> 
> Please remove references to the past and describe "match_inport"
> 
>> + */
>> +static int tpda_set_element_size(struct tpda_drvdata *drvdata,
>> +               struct coresight_device *csdev, int inport, bool 
>> match_inport)
> 
> May be we could switch the order of the parameters:
> 
> match_inport, int port
> 
> Or even inport < 0, implies, port wont be matched.
> 
> i.e.,
> 
> tpda_set_element_size(drvdata, child, inport)
> 
>> +{
>> +    static int nr_inport;
>> +    int i;
>> +    static bool tpdm_found;
>> +    struct coresight_device *in_csdev;
>> +
>> +    if (inport > (TPDA_MAX_INPORTS - 1))
>> +        return -EINVAL;
>> +
>> +    if (match_inport) {
>> +        nr_inport = inport;
>> +        tpdm_found = false;
>> +    }
> 
> Could we not avoid the static variables and this dance by making the 
> function return the dsb_size ? See further down.
> 
> 
>> +
>> +    for (i = 0; i < csdev->pdata->nr_inconns; i++) {
>> +        in_csdev = csdev->pdata->in_conns[i]->src_dev;
>> +        if (!in_csdev)
>> +            break;
>          continue ?
>> +
>> +        if (match_inport)
>> +            if (csdev->pdata->in_conns[i]->dest_port != inport)
>> +                continue;
>> +
>> +        if ((in_csdev->type == CORESIGHT_DEV_TYPE_SOURCE) &&
>> +                (in_csdev->subtype.source_subtype
>> +                == CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM)) {
> 
> Please provide a helper :
> 
> static bool coresight_device_is_tpdm(csdev) {
>      return
>       (csdev->type == CORESIGHT_DEV_TYPE_SOURCE) &&
>       (in_csdev->subtype.source_subtype ==
>          CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
> }
> 
> 
> 
>> +            of_property_read_u8(in_csdev->dev.parent->of_node,
>> +                    "qcom,dsb-element-size", 
>> &drvdata->dsb_esize[nr_inport]);
> 
> 
> 
>> +            if (!tpdm_found)
>> +                tpdm_found = true;
>> +            else
>> +                dev_warn(drvdata->dev,
>> +                    "More than one TPDM is mapped to the TPDA input 
>> port %d.\n",
>> +                    nr_inport);
>> +            continue;
>> +        }
>> +        tpda_set_element_size(drvdata, in_csdev, 0, false);
>> +    }
>> +
> 
> /*
>   * Read the DSB element size from the TPDM device
>   * Returns
>   *    the size read from the firmware if available.
>   *    0 - Otherwise, with a Warning once.
>   */
> static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
> {
>      int rc, size = 0;
> 
>      rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>                       "qcom,dsb-element-size", &size);
>      if (rc)
>          dev_warn_once(&in->dev, "Failed to read TPDM DSB Element size: 
> %d\n",
>          rc);
>      return size;
> }
> 
> static int tpda_get_element_size(struct coresight_device *csdev,
>                   int inport)
> {
>      int dsb_size = -ENOENT;
> 
>      for (i = 0; i < csdev->pdata->nr_inconns; i++) {
>          in = csdev->pdata->in_conns[i]->src_dev;
>          if (!in)
>              continue;
>          if (coresight_device_is_tpdm(in)) {
>              /* Ignore the TPDMs that do not match port */
>              if (inport > 0 &&
>                  (csdev->pdata->in_conns[i]->dest_port !=
>                  inport))
>                  continue;
>              size = tpdm_read_dsb_element_size(csdev);
>          } else {
>              /* Recurse down the path */
>              size = tpda_set_element_size(in, -1);
>          }
> 
>          if (size < 0)
>              return size;
>          /* We have found a size, save it. */
>          if (dsb_size < 0) {
>              dsb_size = size;
>          } else {
>              /* We have duplicate TPDMs */
>              return -EEXIST;
>          }
>      }
>      return dsb_size;
> }
> 
> 
> 
> 
>> +    return 0;
>> +}
>> +
>>   /* Settings pre enabling port control register */
>>   static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
>>   {
>> @@ -32,26 +84,43 @@ static void tpda_enable_pre_port(struct 
>> tpda_drvdata *drvdata)
>>       writel_relaxed(val, drvdata->base + TPDA_CR);
>>   }
>> -static void tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>> +static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>>   {
>>       u32 val;
>>       val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
>> +    /*
>> +     * Configure aggregator port n DSB data set element size
>> +     * Set the bit to 0 if the size is 32
>> +     * Set the bit to 1 if the size is 64
>> +     */
>> +    if (drvdata->dsb_esize[port] == 32)
>> +        val &= ~TPDA_Pn_CR_DSBSIZE;
>> +    else if (drvdata->dsb_esize[port] == 64)
>> +        val |= TPDA_Pn_CR_DSBSIZE;
> 
> Couldn't this be detected via tpda_get_element_size()? see below.
> 
>> +    else
>> +        return -EINVAL;
>> +
>>       /* Enable the port */
>>       val |= TPDA_Pn_CR_ENA;
>>       writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>> +
>> +    return 0;
>>   }
>> -static void __tpda_enable(struct tpda_drvdata *drvdata, int port)
>> +static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
>>   {
>> +    int ret;
>> +
>>       CS_UNLOCK(drvdata->base);
>>       if (!drvdata->csdev->enable)
>>           tpda_enable_pre_port(drvdata);
>> -    tpda_enable_port(drvdata, port);
>> -
>> +    ret = tpda_enable_port(drvdata, port);
>>       CS_LOCK(drvdata->base);
>> +
>> +    return ret;
>>   }
>>   static int tpda_enable(struct coresight_device *csdev,
>> @@ -59,16 +128,23 @@ static int tpda_enable(struct coresight_device 
>> *csdev,
>>                  struct coresight_connection *out)
>>   {
>>       struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>> +    int ret;
>> +
>> +    ret = tpda_set_element_size(drvdata, csdev, in->dest_port, true);
> 
>      size  = tpda_get_element_size(csdev, in->dest_port);
>      switch (size) {
>      case 32:
>      case 64:
>          break;

We also need :

	case 0:
		return -ENOENT;

Suzuki


>      case -EEXIST:
>          dev_warn_once("Detected multiple TPDMs on port %d", ..)
>          fallthrough;
>      default:
>          return size;
>      }
> 
>      drvdata->dsb_esize[in->dest_port] = size;
> 
> Suzuki
> 
> 
> 
>> +    if (ret)
>> +        return ret;
>>       spin_lock(&drvdata->spinlock);
>> -    if (atomic_read(&in->dest_refcnt) == 0)
>> -        __tpda_enable(drvdata, in->dest_port);
>> +    if (atomic_read(&in->dest_refcnt) == 0) {
>> +        ret = __tpda_enable(drvdata, in->dest_port);
>> +        if (!ret) {
>> +            atomic_inc(&in->dest_refcnt);
>> +            dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", 
>> in->dest_port);
>> +        }
>> +    }
>> -    atomic_inc(&in->dest_refcnt);
>>       spin_unlock(&drvdata->spinlock);
>> -
>> -    dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port);
>> -    return 0;
>> +    return ret;
>>   }
>>   static void __tpda_disable(struct tpda_drvdata *drvdata, int port)
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h 
>> b/drivers/hwtracing/coresight/coresight-tpda.h
>> index 0399678..12a1472 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpda.h
>> +++ b/drivers/hwtracing/coresight/coresight-tpda.h
>> @@ -10,6 +10,8 @@
>>   #define TPDA_Pn_CR(n)        (0x004 + (n * 4))
>>   /* Aggregator port enable bit */
>>   #define TPDA_Pn_CR_ENA        BIT(0)
>> +/* Aggregator port DSB data set element size bit */
>> +#define TPDA_Pn_CR_DSBSIZE        BIT(8)
>>   #define TPDA_MAX_INPORTS    32
>> @@ -23,6 +25,7 @@
>>    * @csdev:      component vitals needed by the framework.
>>    * @spinlock:   lock for the drvdata value.
>>    * @enable:     enable status of the component.
>> + * @dsb_esize:  DSB element size for each inport, it must be 32 or 64.
>>    */
>>   struct tpda_drvdata {
>>       void __iomem        *base;
>> @@ -30,6 +33,7 @@ struct tpda_drvdata {
>>       struct coresight_device    *csdev;
>>       spinlock_t        spinlock;
>>       u8            atid;
>> +    u8            dsb_esize[TPDA_MAX_INPORTS];
>>   };
>>   #endif  /* _CORESIGHT_CORESIGHT_TPDA_H */
> 


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Re: [PATCH v7 09/13] coresight-tpdm: Add nodes for dsb edge control

[Suzuki K Poulose]

On 25/07/2023 08:15, Tao Zhang wrote:
> Add the nodes to set value for DSB edge control and DSB edge
> control mask. Each DSB subunit TPDM has maximum of n(n<16) EDCR
> resgisters to configure edge control. DSB edge detection control
> 00: Rising edge detection
> 01: Falling edge detection
> 10: Rising and falling edge detection (toggle detection)
> And each DSB subunit TPDM has maximum of m(m<8) ECDMR registers to
> configure mask. Eight 32 bit registers providing DSB interface
> edge detection mask control.
> 
> Add the nodes to configure DSB edge control and DSB edge control
> mask. Each DSB subunit TPDM maximum of 256 edge detections can be
> configured. The index and value sysfs files need to be paired and
> written to order. The index sysfs file is to set the index number
> of the edge detection which needs to be configured. And the value
> sysfs file is to set the control or mask for the edge detection.
> DSB edge detection control should be set as the following values.
> 00: Rising edge detection
> 01: Falling edge detection
> 10: Rising and falling edge detection (toggle detection)
> And DSB edge mask should be set as 0 or 1.
> Each DSB subunit TPDM has maximum of n(n<16) EDCR resgisters to
> configure edge control. And each DSB subunit TPDM has maximum of
> m(m<8) ECDMR registers to configure mask.
> 
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> ---
>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   |  39 +++++
>   drivers/hwtracing/coresight/coresight-tpdm.c       | 158 ++++++++++++++++++++-
>   drivers/hwtracing/coresight/coresight-tpdm.h       |  30 +++-
>   3 files changed, 223 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index 2a82cd0..a4550c5 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> @@ -60,3 +60,42 @@ Description:
>   		Bit[3] : Set to 0 for low performance mode.
>   				 Set to 1 for high performance mode.
>   		Bit[4:8] : Select byte lane for high performance mode.
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_edge_ctrl_idx
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		Read/Write the index number of the edge detection for the DSB
> +		subunit TPDM. Since there are at most 256 edge detections, this
> +		value ranges from 0 to 255.
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_edge_ctrl_val
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		Read a set of the edge control registers of the DSB in TPDM.
> +		Write a data to control the edge detection corresponding to
> +		the index number. Before writing data to this sysfs file,
> +		"dsb_edge_ctrl_idx" should be written first to configure the
> +		index number of the edge detection which needs to be controlled.
> +
> +		Accepts only one of the following values.
> +		0 - Rising edge detection
> +		1 - Falling edge detection
> +		2 - Rising and falling edge detection (toggle detection)
> +
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_edge_ctrl_mask
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		Read a set of the edge control mask registers of the DSB in TPDM.
> +		Write a data to mask the edge detection corresponding to the index
> +		number. Before writing data to this sysfs file, "dsb_edge_ctrl_idx"
> +		should be written first to configure the index number of the edge
> +		detection which needs to be masked.
> +
> +		Accepts only one of the 2 values -  0 or 1.
> \ No newline at end of file
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index c38760b..98fd6ab 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -71,7 +71,14 @@ static void set_dsb_perf_mode(struct tpdm_drvdata *drvdata, u32 *val)
>   
>   static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   {
> -	u32 val;
> +	u32 val, i;
> +
> +	for (i = 0; i < TPDM_DSB_MAX_EDCR; i++)
> +		writel_relaxed(drvdata->dsb->edge_ctrl[i],
> +			   drvdata->base + TPDM_DSB_EDCR(i));
> +	for (i = 0; i < TPDM_DSB_MAX_EDCMR; i++)
> +		writel_relaxed(drvdata->dsb->edge_ctrl_mask[i],
> +			   drvdata->base + TPDM_DSB_EDCMR(i));
>   
>   	val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
>   	/* Set trigger timestamp */
> @@ -302,6 +309,152 @@ static ssize_t dsb_mode_store(struct device *dev,
>   }
>   static DEVICE_ATTR_RW(dsb_mode);
>   
> +static ssize_t dsb_edge_ctrl_idx_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->edge_ctrl_idx);
> +}
> +
> +/*
> + * The EDCR registers can include up to 16 32-bit registers, and each
> + * one can be configured to control up to 16 edge detections(2 bits
> + * control one edge detection). So a total 256 edge detections can be
> + * configured. This function provides a way to set the index number of
> + * the edge detection which needs to be configured.
> + */
> +static ssize_t dsb_edge_ctrl_idx_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 >= TPDM_DSB_MAX_LINES))
> +		return -EINVAL;
> +
> +	spin_lock(&drvdata->spinlock);
> +	drvdata->dsb->edge_ctrl_idx = val;
> +	spin_unlock(&drvdata->spinlock);
> +
> +	return size;
> +}
> +static DEVICE_ATTR_RW(dsb_edge_ctrl_idx);
> +
> +static ssize_t dsb_edge_ctrl_val_show(struct device *dev,
> +				       struct device_attribute *attr,
> +				       char *buf)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +	ssize_t size = 0;
> +	unsigned long bytes;
> +	int i;
> +
> +	spin_lock(&drvdata->spinlock);
> +	for (i = 0; i < TPDM_DSB_MAX_EDCR; i++) {
> +		bytes = sysfs_emit_at(buf, size,
> +				  "Val:0x%x\n", drvdata->dsb->edge_ctrl[i]);
> +		if (bytes <= 0)
> +			break;
> +		size += bytes;
> +	}
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +
> +/*
> + * This function is used to control the edge detection according
> + * to the index number that has been set.
> + * "edge_ctrl" should be one of the following values.
> + * 0 - Rising edge detection
> + * 1 - Falling edge detection
> + * 2 - Rising and falling edge detection (toggle detection)
> + */
> +static ssize_t dsb_edge_ctrl_val_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, mask, edge_ctrl;
> +	int reg;
> +
> +	if ((kstrtoul(buf, 0, &edge_ctrl)) || (edge_ctrl > 0x2))
> +		return -EINVAL;
> +
> +	spin_lock(&drvdata->spinlock);
> +	/*
> +	 * There are 2 bit per DSB Edge Control line.
> +	 * Thus we have 16 lines in a 32bit word.
> +	 */
> +	reg = EDCR_TO_WORD_IDX(drvdata->dsb->edge_ctrl_idx);
> +	mask = EDCR_TO_WORD_MASK(drvdata->dsb->edge_ctrl_idx);
> +	val = drvdata->dsb->edge_ctrl[reg];
> +	val &= ~EDCR_TO_WORD_MASK(drvdata->dsb->edge_ctrl_idx);
> +	val |= EDCR_TO_WORD_VAL(edge_ctrl, drvdata->dsb->edge_ctrl_idx);
> +	drvdata->dsb->edge_ctrl[reg] = val;
> +	spin_unlock(&drvdata->spinlock);
> +
> +	return size;
> +}
> +static DEVICE_ATTR_RW(dsb_edge_ctrl_val);
> +
> +static ssize_t dsb_edge_ctrl_mask_show(struct device *dev,
> +					    struct device_attribute *attr,
> +					    char *buf)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +	ssize_t size = 0;
> +	unsigned long bytes;
> +	int i;
> +
> +	spin_lock(&drvdata->spinlock);
> +	for (i = 0; i < TPDM_DSB_MAX_EDCMR; i++) {
> +		bytes = sysfs_emit_at(buf, size,
> +				  "Val:0x%x\n", drvdata->dsb->edge_ctrl_mask[i]);
> +		if (bytes <= 0)
> +			break;
> +		size += bytes;
> +	}
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +
> +static ssize_t dsb_edge_ctrl_mask_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;
> +	u32 set;
> +	int reg;
> +
> +	if ((kstrtoul(buf, 0, &val)) || (val & ~1UL))
> +		return -EINVAL;
> +
> +	spin_lock(&drvdata->spinlock);
> +	/*
> +	 * There is 1 bit per DSB Edge Control Mark line.
> +	 * Thus we have 32 lines in a 32bit word.
> +	 */
> +	reg = EDCMR_TO_WORD_IDX(drvdata->dsb->edge_ctrl_idx);
> +	set = drvdata->dsb->edge_ctrl_mask[reg];
> +	if (val)
> +		set |= BIT(EDCMR_TO_WORD_SHIFT(drvdata->dsb->edge_ctrl_idx));
> +	else
> +		set &= ~BIT(EDCMR_TO_WORD_SHIFT(drvdata->dsb->edge_ctrl_idx));
> +		drvdata->dsb->edge_ctrl_mask[reg] = set;


drivers/hwtracing/coresight/coresight-tpdm.c: In function 
‘dsb_edge_ctrl_mask_store’:
drivers/hwtracing/coresight/coresight-tpdm.c:449:2: error: this ‘else’ 
clause does not guard... [-Werror=misleading-indentation]
   else
   ^~~~
drivers/hwtracing/coresight/coresight-tpdm.c:451:3: note: ...this 
statement, but the latter is misleadingly indented as if it were guarded 
by the ‘else’
    drvdata->dsb->edge_ctrl_mask[reg] = set;
    ^~~~~~~
cc1: all warnings being treated as errors
make[4]: *** [scripts/Makefile.build:243: 
drivers/hwtracing/coresight/coresight-tpdm.o] Error 1
make[3]: *** [scripts/Makefile.build:480: drivers/hwtracing/coresight] 
Error 2
make[2]: *** [scripts/Makefile.build:480: drivers] Error 2
make[1]: *** [/ssd/src/LINUX-CORESIGHT/Makefile:2032: .] Error 2
make: *** [Makefile:234: __sub-make] Error 2

Suzuki

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Re: [PATCH v7 05/13] coresight-tpdm: Initialize DSB subunit configuration

[Suzuki K Poulose]

On 25/07/2023 08:15, Tao Zhang wrote:
> DSB is used for monitoring “events”. Events are something that
> occurs at some point in time. It could be a state decode, the
> act of writing/reading a particular address, a FIFO being empty,
> etc. This decoding of the event desired is done outside TPDM.
> DSB subunit need to be configured in enablement and disablement.
> A struct that specifics associated to dsb dataset is needed. It
> saves the configuration and parameters of the dsb datasets. This
> change is to add this struct and initialize the configuration of
> DSB subunit.
> 
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> ---
>   drivers/hwtracing/coresight/coresight-tpdm.c | 55 ++++++++++++++++++++++++++--
>   drivers/hwtracing/coresight/coresight-tpdm.h | 18 +++++++++
>   2 files changed, 69 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index abaff0b..52aa48a6 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -20,17 +20,46 @@
>   
>   DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm");
>   
> +static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
> +{
> +	if (drvdata->datasets & TPDM_PIDR0_DS_DSB) {

Do we need a helper for this, we seem to be doing this more than once ?

tpdm_has_dsb_dataset(drvdata) ?

> +		memset(drvdata->dsb, 0, sizeof(struct dsb_dataset));
> +
> +		drvdata->dsb->trig_ts = true;
> +		drvdata->dsb->trig_type = false;
> +	}
> +}
> +
>   static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   {
>   	u32 val;
>   
> -	/* Set the enable bit of DSB control register to 1 */
> +	val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
> +	/* Set trigger timestamp */
> +	if (drvdata->dsb->trig_ts)
> +		val |= TPDM_DSB_TIER_XTRIG_TSENAB;
> +	else
> +		val &= ~TPDM_DSB_TIER_XTRIG_TSENAB;
> +	writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
> +
>   	val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
> +	/* Set trigger type */
> +	if (drvdata->dsb->trig_type)
> +		val |= TPDM_DSB_CR_TRIG_TYPE;
> +	else
> +		val &= ~TPDM_DSB_CR_TRIG_TYPE;
> +	/* Set the enable bit of DSB control register to 1 */
>   	val |= TPDM_DSB_CR_ENA;
>   	writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
>   }
>   
> -/* TPDM enable operations */
> +/* TPDM enable operations

minor nit:

/*
  * TPDM enable..

> + * The TPDM or Monitor serves as data collection component for various
> + * dataset types. It covers Basic Counts(BC), Tenure Counts(TC),
> + * Continuous Multi-Bit(CMB), Multi-lane CMB(MCMB) and Discrete Single
> + * Bit(DSB). This function will initialize the configuration according
> + * to the dataset type supported by the TPDM.
> + */
>   static void __tpdm_enable(struct tpdm_drvdata *drvdata)
>   {
>   	CS_UNLOCK(drvdata->base);
> @@ -110,13 +139,24 @@ static const struct coresight_ops tpdm_cs_ops = {
>   	.source_ops	= &tpdm_source_ops,
>   };
>   
> -static void tpdm_init_default_data(struct tpdm_drvdata *drvdata)
> +static int tpdm_datasets_setup(struct tpdm_drvdata *drvdata)
>   {
>   	u32 pidr;
>   
>   	/*  Get the datasets present on the TPDM. */
>   	pidr = readl_relaxed(drvdata->base + CORESIGHT_PERIPHIDR0);
>   	drvdata->datasets |= pidr & GENMASK(TPDM_DATASETS - 1, 0);
> +
> +	if (drvdata->datasets & TPDM_PIDR0_DS_DSB) {
> +		if (!drvdata->dsb) {

This could be :

	if (tpdm_has_dsb_dataset(drvdata) && !drvdata->dsb) {
> +			drvdata->dsb = devm_kzalloc(drvdata->dev,
> +						    sizeof(*drvdata->dsb), GFP_KERNEL);
> +			if (!drvdata->dsb)
> +				return -ENOMEM;

	}

> +		}
> +	}

Could we move the reset datasets here ?
	tpdm_reset_datasets(drvdata);

> +
> +	return 0;
>   }
>   
>   /*
> @@ -179,6 +219,7 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
>   	struct coresight_platform_data *pdata;
>   	struct tpdm_drvdata *drvdata;
>   	struct coresight_desc desc = { 0 };
> +	int ret;
>   
>   	pdata = coresight_get_platform_data(dev);
>   	if (IS_ERR(pdata))
> @@ -198,6 +239,12 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
>   
>   	drvdata->base = base;
>   
> +	ret = tpdm_datasets_setup(drvdata);
> +	if (ret)
> +		return ret;
> +
> +	tpdm_reset_datasets(drvdata);

^^ We could move this to datasets_setup(), see above.

> +
>   	/* Set up coresight component description */
>   	desc.name = coresight_alloc_device_name(&tpdm_devs, dev);
>   	if (!desc.name)
> @@ -214,7 +261,7 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
>   		return PTR_ERR(drvdata->csdev);
>   
>   	spin_lock_init(&drvdata->spinlock);
> -	tpdm_init_default_data(drvdata);
> +
>   	/* Decrease pm refcount when probe is done.*/
>   	pm_runtime_put(&adev->dev);
>   
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
> index 5438540..92c34cd 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
> @@ -11,8 +11,14 @@
>   
>   /* DSB Subunit Registers */
>   #define TPDM_DSB_CR		(0x780)
> +#define TPDM_DSB_TIER		(0x784)
> +
>   /* Enable bit for DSB subunit */
>   #define TPDM_DSB_CR_ENA		BIT(0)
> +/* Enable bit for DSB subunit trigger type */
> +#define TPDM_DSB_CR_TRIG_TYPE		BIT(12)
> +/* Enable bit for DSB subunit trigger timestamp */
> +#define TPDM_DSB_TIER_XTRIG_TSENAB		BIT(1)
>   
>   /* TPDM integration test registers */
>   #define TPDM_ITATBCNTRL		(0xEF0)
> @@ -41,6 +47,16 @@
>   #define TPDM_PIDR0_DS_DSB	BIT(1)
>   
>   /**
> + * struct dsb_dataset - specifics associated to dsb dataset
> + * @trig_ts:          Enable/Disable trigger timestamp.
> + * @trig_type:        Enable/Disable trigger type.
> + */
> +struct dsb_dataset {
> +	bool			trig_ts;
> +	bool			trig_type;
> +};
> +
> +/**
>    * struct tpdm_drvdata - specifics associated to an TPDM component
>    * @base:       memory mapped base address for this component.
>    * @dev:        The device entity associated to this component.
> @@ -48,6 +64,7 @@
>    * @spinlock:   lock for the drvdata value.
>    * @enable:     enable status of the component.
>    * @datasets:   The datasets types present of the TPDM.
> + * @dsb         Specifics associated to an TPDM component.

		    TPDM DSB related settings ?

Suzuki


>    */
>   
>   struct tpdm_drvdata {
> @@ -57,6 +74,7 @@ struct tpdm_drvdata {
>   	spinlock_t		spinlock;
>   	bool			enable;
>   	unsigned long		datasets;
> +	struct dsb_dataset	*dsb;
>   };
>   
>   #endif  /* _CORESIGHT_CORESIGHT_TPDM_H */


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Re: [PATCH v7 06/13] coresight-tpdm: Add reset node to TPDM node

[Suzuki K Poulose]

On 25/07/2023 08:15, Tao Zhang wrote:
> 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 ?

> +
> +		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)


> +{
> +	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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Re: [PATCH v7 07/13] coresight-tpdm: Add nodes to set trigger timestamp and type

[Suzuki K Poulose]

On 25/07/2023 08:15, 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       | 94 ++++++++++++++++++++++
>   2 files changed, 118 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index dbc2fbd0..0b7b4ad 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	6.5
> +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.

Please use: (RW) instead of (Write).

		(RW) Set/Get the trigger type of the DSB for TPDM.
Similarly for the items below.

> +
> +		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
> +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 acc3eea..62efc18 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -20,6 +20,18 @@
>   
>   DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm");
>   
> +static umode_t tpdm_dsb_is_visible(struct kobject *kobj,
> +					   struct attribute *attr, int n)

Please keep the alignment.

> +{
> +	struct device *dev = kobj_to_dev(kobj);
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +
> +	if (drvdata && (drvdata->datasets & TPDM_PIDR0_DS_DSB))

As suggested earlier, add a wrapper for the above check.

> +		return attr->mode;
> +
> +	return 0;
> +}
> +
>   static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
>   {
>   	if (drvdata->datasets & TPDM_PIDR0_DS_DSB) {
> @@ -229,8 +241,90 @@ 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)

Please follow the above alignment for all functions throughout the 
series. There are unaligned parameter lists scattered around the series.

> +{
> +	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.

Suzuk


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Re: [PATCH v7 08/13] coresight-tpdm: Add node to set dsb programming mode

[Suzuki K Poulose]

On 25/07/2023 08:15, Tao Zhang wrote:
> Add node to set and show programming mode for TPDM DSB subunit.
> Once the DSB programming mode is set, it will be written to the
> register DSB_CR.
> 
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> ---
>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   | 15 ++++++
>   drivers/hwtracing/coresight/coresight-tpdm.c       | 62 ++++++++++++++++++++++
>   drivers/hwtracing/coresight/coresight-tpdm.h       | 16 ++++++
>   3 files changed, 93 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index 0b7b4ad..2a82cd0 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> @@ -45,3 +45,18 @@ Description:
>   		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_mode
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		(Write) Set the mode of DSB tpdm. Read the mode of DSB
> +		tpdm.

(RW) ...

> +
> +		Accepts the value needs to be greater than 0. What data
> +		bits do is listed below.
> +		Bit[0:1] : Test mode control bit for choosing the inputs.
> +		Bit[3] : Set to 0 for low performance mode.
> +				 Set to 1 for high performance mode.
> +		Bit[4:8] : Select byte lane for high performance mode.
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index 62efc18..c38760b 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -4,6 +4,7 @@
>    */
>   
>   #include <linux/amba/bus.h>
> +#include <linux/bitfield.h>
>   #include <linux/bitmap.h>
>   #include <linux/coresight.h>
>   #include <linux/coresight-pmu.h>
> @@ -42,6 +43,32 @@ static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
>   	}
>   }
>   
> +static void set_dsb_test_mode(struct tpdm_drvdata *drvdata, u32 *val)
> +{
> +	u32 mode;
> +
> +	mode = TPDM_DSB_MODE_TEST(drvdata->dsb->mode);
> +	*val &= ~TPDM_DSB_TEST_MODE;
> +	*val |= FIELD_PREP(TPDM_DSB_TEST_MODE, mode);
> +}
> +
> +static void set_dsb_hpsel_mode(struct tpdm_drvdata *drvdata, u32 *val)
> +{
> +	u32 mode;
> +
> +	mode = TPDM_DSB_MODE_HPBYTESEL(drvdata->dsb->mode);
> +	*val &= ~TPDM_DSB_HPSEL;
> +	*val |= FIELD_PREP(TPDM_DSB_HPSEL, mode);
> +}
> +
> +static void set_dsb_perf_mode(struct tpdm_drvdata *drvdata, u32 *val)
> +{
> +	if (drvdata->dsb->mode & TPDM_DSB_MODE_PERF)
> +		*val |= TPDM_DSB_CR_MODE;
> +	else
> +		*val &= ~TPDM_DSB_CR_MODE;
> +}
> +
>   static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   {
>   	u32 val;
> @@ -55,6 +82,12 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   	writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
>   
>   	val = readl_relaxed(drvdata->base + TPDM_DSB_CR);

> +	/* Set the test accurate mode */
> +	set_dsb_test_mode(drvdata, &val);
> +	/* Set the byte lane for high-performance mode */
> +	set_dsb_hpsel_mode(drvdata, &val);
> +	/* Set the performance mode */
> +	set_dsb_perf_mode(drvdata, &val);

Couldn't all of them be combined to a single function, as they
operate on a single value to be written ?

	set_dsb_mode(drvdata, &val);


>   	/* Set trigger type */
>   	if (drvdata->dsb->trig_type)
>   		val |= TPDM_DSB_CR_TRIG_TYPE;
> @@ -241,6 +274,34 @@ static struct attribute_group tpdm_attr_grp = {
>   	.attrs = tpdm_attrs,
>   };
>   
> +static ssize_t dsb_mode_show(struct device *dev,
> +				  struct device_attribute *attr,
> +				  char *buf)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +
> +	return sysfs_emit(buf, "%lx\n",
> +			 (unsigned long)drvdata->dsb->mode);

It is u32 anyways, hence why not :

		(buf, "%x\n", drvdata->dsb->mode) ?


> +}
> +
> +static ssize_t dsb_mode_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 < 0)
> +		return -EINVAL;
> +

Is it not an error :
	 if (val & ~TPDM_DSB_MODE_MASK) ?

> +	spin_lock(&drvdata->spinlock);
> +	drvdata->dsb->mode = val & TPDM_DSB_MODE_MASK;
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +static DEVICE_ATTR_RW(dsb_mode);
> +
>   static ssize_t dsb_trig_type_show(struct device *dev,
>   				     struct device_attribute *attr, char *buf)
>   {
> @@ -312,6 +373,7 @@ static ssize_t dsb_trig_ts_store(struct device *dev,
>   static DEVICE_ATTR_RW(dsb_trig_ts);
>   
>   static struct attribute *tpdm_dsb_attrs[] = {
> +	&dev_attr_dsb_mode.attr,
>   	&dev_attr_dsb_trig_ts.attr,
>   	&dev_attr_dsb_trig_type.attr,
>   	NULL,
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
> index 92c34cd..49fffb1 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
> @@ -15,11 +15,25 @@
>   
>   /* Enable bit for DSB subunit */
>   #define TPDM_DSB_CR_ENA		BIT(0)
> +/* Enable bit for DSB subunit perfmance mode */
> +#define TPDM_DSB_CR_MODE		BIT(1)
>   /* Enable bit for DSB subunit trigger type */
>   #define TPDM_DSB_CR_TRIG_TYPE		BIT(12)
> +
>   /* Enable bit for DSB subunit trigger timestamp */
>   #define TPDM_DSB_TIER_XTRIG_TSENAB		BIT(1)
>   
> +/* DSB programming modes */
> +/* Test mode control bit*/
> +#define TPDM_DSB_MODE_TEST(val)	(val & GENMASK(1, 0))

What is the difference between MODE_TEST ^ and the TEST_MODE ( below ).
Please could we have clear naming conventions ?

> +/* Performance mode */
> +#define TPDM_DSB_MODE_PERF		BIT(3)

> +/* High performance mode */
> +#define TPDM_DSB_MODE_HPBYTESEL(val)	(val & GENMASK(8, 4))
> +#define TPDM_DSB_MODE_MASK			GENMASK(8, 0)


> +#define TPDM_DSB_TEST_MODE		GENMASK(10, 9)
> +#define TPDM_DSB_HPSEL		GENMASK(6, 2)

Ah, I read it again and these two are really TPDM_DSB_CR_x and
1) Must be defined as such (to avoid any confusion as above)
2) And defined closer to the other value defintions for the registers ?


Suzuki

> +
>   /* TPDM integration test registers */
>   #define TPDM_ITATBCNTRL		(0xEF0)
>   #define TPDM_ITCNTRL		(0xF00)
> @@ -48,10 +62,12 @@
>   
>   /**
>    * struct dsb_dataset - specifics associated to dsb dataset
> + * @mode:             DSB programming mode
>    * @trig_ts:          Enable/Disable trigger timestamp.
>    * @trig_type:        Enable/Disable trigger type.
>    */
>   struct dsb_dataset {
> +	u32				mode;
>   	bool			trig_ts;
>   	bool			trig_type;
>   };


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Re: [PATCH v7 09/13] coresight-tpdm: Add nodes for dsb edge control

[Suzuki K Poulose]

On 25/07/2023 08:15, Tao Zhang wrote:
> Add the nodes to set value for DSB edge control and DSB edge
> control mask. Each DSB subunit TPDM has maximum of n(n<16) EDCR
> resgisters to configure edge control. DSB edge detection control
> 00: Rising edge detection
> 01: Falling edge detection
> 10: Rising and falling edge detection (toggle detection)
> And each DSB subunit TPDM has maximum of m(m<8) ECDMR registers to
> configure mask. Eight 32 bit registers providing DSB interface
> edge detection mask control.
> 
> Add the nodes to configure DSB edge control and DSB edge control
> mask. Each DSB subunit TPDM maximum of 256 edge detections can be
> configured. The index and value sysfs files need to be paired and
> written to order. The index sysfs file is to set the index number
> of the edge detection which needs to be configured. And the value
> sysfs file is to set the control or mask for the edge detection.
> DSB edge detection control should be set as the following values.
> 00: Rising edge detection
> 01: Falling edge detection
> 10: Rising and falling edge detection (toggle detection)
> And DSB edge mask should be set as 0 or 1.
> Each DSB subunit TPDM has maximum of n(n<16) EDCR resgisters to
> configure edge control. And each DSB subunit TPDM has maximum of
> m(m<8) ECDMR registers to configure mask.
> 
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> ---
>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   |  39 +++++
>   drivers/hwtracing/coresight/coresight-tpdm.c       | 158 ++++++++++++++++++++-
>   drivers/hwtracing/coresight/coresight-tpdm.h       |  30 +++-
>   3 files changed, 223 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index 2a82cd0..a4550c5 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> @@ -60,3 +60,42 @@ Description:
>   		Bit[3] : Set to 0 for low performance mode.
>   				 Set to 1 for high performance mode.
>   		Bit[4:8] : Select byte lane for high performance mode.
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_edge_ctrl_idx
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		Read/Write the index number of the edge detection for the DSB
> +		subunit TPDM. Since there are at most 256 edge detections, this
> +		value ranges from 0 to 255.
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_edge_ctrl_val
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		Read a set of the edge control registers of the DSB in TPDM.
> +		Write a data to control the edge detection corresponding to
> +		the index number. Before writing data to this sysfs file,
> +		"dsb_edge_ctrl_idx" should be written first to configure the
> +		index number of the edge detection which needs to be controlled.
> +
> +		Accepts only one of the following values.
> +		0 - Rising edge detection
> +		1 - Falling edge detection
> +		2 - Rising and falling edge detection (toggle detection)
> +
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_edge_ctrl_mask
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		Read a set of the edge control mask registers of the DSB in TPDM.
> +		Write a data to mask the edge detection corresponding to the index
> +		number. Before writing data to this sysfs file, "dsb_edge_ctrl_idx"
> +		should be written first to configure the index number of the edge
> +		detection which needs to be masked.
> +
> +		Accepts only one of the 2 values -  0 or 1.
> \ No newline at end of file
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index c38760b..98fd6ab 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -71,7 +71,14 @@ static void set_dsb_perf_mode(struct tpdm_drvdata *drvdata, u32 *val)
>   
>   static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   {
> -	u32 val;
> +	u32 val, i;
> +
> +	for (i = 0; i < TPDM_DSB_MAX_EDCR; i++)
> +		writel_relaxed(drvdata->dsb->edge_ctrl[i],
> +			   drvdata->base + TPDM_DSB_EDCR(i));
> +	for (i = 0; i < TPDM_DSB_MAX_EDCMR; i++)
> +		writel_relaxed(drvdata->dsb->edge_ctrl_mask[i],
> +			   drvdata->base + TPDM_DSB_EDCMR(i));
>   
>   	val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
>   	/* Set trigger timestamp */
> @@ -302,6 +309,152 @@ static ssize_t dsb_mode_store(struct device *dev,
>   }
>   static DEVICE_ATTR_RW(dsb_mode);
>   
> +static ssize_t dsb_edge_ctrl_idx_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->edge_ctrl_idx);
> +}
> +
> +/*
> + * The EDCR registers can include up to 16 32-bit registers, and each
> + * one can be configured to control up to 16 edge detections(2 bits
> + * control one edge detection). So a total 256 edge detections can be
> + * configured. This function provides a way to set the index number of
> + * the edge detection which needs to be configured.
> + */
> +static ssize_t dsb_edge_ctrl_idx_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 >= TPDM_DSB_MAX_LINES))
> +		return -EINVAL;
> +
> +	spin_lock(&drvdata->spinlock);
> +	drvdata->dsb->edge_ctrl_idx = val;
> +	spin_unlock(&drvdata->spinlock);
> +
> +	return size;
> +}
> +static DEVICE_ATTR_RW(dsb_edge_ctrl_idx);
> +
> +static ssize_t dsb_edge_ctrl_val_show(struct device *dev,
> +				       struct device_attribute *attr,
> +				       char *buf)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +	ssize_t size = 0;
> +	unsigned long bytes;
> +	int i;
> +
> +	spin_lock(&drvdata->spinlock);
> +	for (i = 0; i < TPDM_DSB_MAX_EDCR; i++) {
> +		bytes = sysfs_emit_at(buf, size,
> +				  "Val:0x%x\n", drvdata->dsb->edge_ctrl[i]);

This feels a bit odd. edget_ctrl_val allows storing one "edge ctrl"
value, while "show"ing all EDCR values. We could split them to :

Read only sysfs files:

dsb_edcr0 ... dsb_edcr15

for each EDCR register (similarly for the mask)

and may be show the specific edge_ctrl_line for with the above function 
for selected index.

> +		if (bytes <= 0)
> +			break;
> +		size += bytes;
> +	}
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +
> +/*
> + * This function is used to control the edge detection according
> + * to the index number that has been set.
> + * "edge_ctrl" should be one of the following values.
> + * 0 - Rising edge detection
> + * 1 - Falling edge detection
> + * 2 - Rising and falling edge detection (toggle detection)
> + */
> +static ssize_t dsb_edge_ctrl_val_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, mask, edge_ctrl;
> +	int reg;
> +
> +	if ((kstrtoul(buf, 0, &edge_ctrl)) || (edge_ctrl > 0x2))
> +		return -EINVAL;
> +
> +	spin_lock(&drvdata->spinlock);
> +	/*
> +	 * There are 2 bit per DSB Edge Control line.
> +	 * Thus we have 16 lines in a 32bit word.
> +	 */
> +	reg = EDCR_TO_WORD_IDX(drvdata->dsb->edge_ctrl_idx);
> +	mask = EDCR_TO_WORD_MASK(drvdata->dsb->edge_ctrl_idx);
> +	val = drvdata->dsb->edge_ctrl[reg];
> +	val &= ~EDCR_TO_WORD_MASK(drvdata->dsb->edge_ctrl_idx);
> +	val |= EDCR_TO_WORD_VAL(edge_ctrl, drvdata->dsb->edge_ctrl_idx);
> +	drvdata->dsb->edge_ctrl[reg] = val;
> +	spin_unlock(&drvdata->spinlock);
> +
> +	return size;
> +}
> +static DEVICE_ATTR_RW(dsb_edge_ctrl_val);

This can be WO attribute to write to a given line.

> +
> +static ssize_t dsb_edge_ctrl_mask_show(struct device *dev,
> +					    struct device_attribute *attr,
> +					    char *buf)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +	ssize_t size = 0;
> +	unsigned long bytes;
> +	int i;
> +
> +	spin_lock(&drvdata->spinlock);
> +	for (i = 0; i < TPDM_DSB_MAX_EDCMR; i++) {
> +		bytes = sysfs_emit_at(buf, size,
> +				  "Val:0x%x\n", drvdata->dsb->edge_ctrl_mask[i]);

As mentioned above, please don't do this. One value per file. Add

dsb_edcmr0..dsb_edcmr7

and print only the selected index mask for this function.

> +		if (bytes <= 0)
> +			break;
> +		size += bytes;
> +	}
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +
> +static ssize_t dsb_edge_ctrl_mask_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;
> +	u32 set;
> +	int reg;
> +
> +	if ((kstrtoul(buf, 0, &val)) || (val & ~1UL))
> +		return -EINVAL;
> +
> +	spin_lock(&drvdata->spinlock);
> +	/*
> +	 * There is 1 bit per DSB Edge Control Mark line.
> +	 * Thus we have 32 lines in a 32bit word.
> +	 */
> +	reg = EDCMR_TO_WORD_IDX(drvdata->dsb->edge_ctrl_idx);
> +	set = drvdata->dsb->edge_ctrl_mask[reg];
> +	if (val)
> +		set |= BIT(EDCMR_TO_WORD_SHIFT(drvdata->dsb->edge_ctrl_idx));
> +	else
> +		set &= ~BIT(EDCMR_TO_WORD_SHIFT(drvdata->dsb->edge_ctrl_idx));
> +		drvdata->dsb->edge_ctrl_mask[reg] = set;
> +	spin_unlock(&drvdata->spinlock);
> +
> +	return size;
> +}
> +static DEVICE_ATTR_RW(dsb_edge_ctrl_mask);
> +
>   static ssize_t dsb_trig_type_show(struct device *dev,
>   				     struct device_attribute *attr, char *buf)
>   {
> @@ -374,6 +527,9 @@ static DEVICE_ATTR_RW(dsb_trig_ts);
>   
>   static struct attribute *tpdm_dsb_attrs[] = {
>   	&dev_attr_dsb_mode.attr,
> +	&dev_attr_dsb_edge_ctrl_idx.attr,
> +	&dev_attr_dsb_edge_ctrl_val.attr,
> +	&dev_attr_dsb_edge_ctrl_mask.attr,
>   	&dev_attr_dsb_trig_ts.attr,
>   	&dev_attr_dsb_trig_type.attr,
>   	NULL,
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
> index 49fffb1..4afdb29 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
> @@ -12,6 +12,8 @@
>   /* DSB Subunit Registers */
>   #define TPDM_DSB_CR		(0x780)
>   #define TPDM_DSB_TIER		(0x784)
> +#define TPDM_DSB_EDCR(n)	(0x808 + (n * 4))
> +#define TPDM_DSB_EDCMR(n)	(0x848 + (n * 4))
>   
>   /* Enable bit for DSB subunit */
>   #define TPDM_DSB_CR_ENA		BIT(0)
> @@ -34,6 +36,16 @@
>   #define TPDM_DSB_TEST_MODE		GENMASK(10, 9)
>   #define TPDM_DSB_HPSEL		GENMASK(6, 2)
>   
> +#define EDCRS_PER_WORD				16
> +#define EDCR_TO_WORD_IDX(r)			((r) / EDCRS_PER_WORD)
> +#define EDCR_TO_WORD_SHIFT(r)		((r % EDCRS_PER_WORD) * 2)
> +#define EDCR_TO_WORD_VAL(val, r)	(val << EDCR_TO_WORD_SHIFT(r))
> +#define EDCR_TO_WORD_MASK(r)		EDCR_TO_WORD_VAL(0x3, r)
> +
> +#define EDCMRS_PER_WORD				32
> +#define EDCMR_TO_WORD_IDX(r)		((r) / EDCMRS_PER_WORD)
> +#define EDCMR_TO_WORD_SHIFT(r)		((r) % EDCMRS_PER_WORD)
> +
>   /* TPDM integration test registers */
>   #define TPDM_ITATBCNTRL		(0xEF0)
>   #define TPDM_ITCNTRL		(0xF00)
> @@ -60,14 +72,26 @@
>   #define TPDM_PIDR0_DS_IMPDEF	BIT(0)
>   #define TPDM_PIDR0_DS_DSB	BIT(1)
>   
> +#define TPDM_DSB_MAX_LINES	256
> +/* MAX number of EDCR registers */
> +#define TPDM_DSB_MAX_EDCR	16
> +/* MAX number of EDCMR registers */
> +#define TPDM_DSB_MAX_EDCMR	8
> +
>   /**
>    * struct dsb_dataset - specifics associated to dsb dataset
> - * @mode:             DSB programming mode
> - * @trig_ts:          Enable/Disable trigger timestamp.
> - * @trig_type:        Enable/Disable trigger type.
> + * @mode:               DSB programming mode
> + * @edge_ctrl_idx       Index number of the edge control
> + * @edge_ctrl:          Save value for edge control
> + * @edge_ctrl_mask:     Save value for edge control mask
> + * @trig_ts:            Enable/Disable trigger timestamp.
> + * @trig_type:          Enable/Disable trigger type.
>    */
>   struct dsb_dataset {
>   	u32				mode;
> +	u32				edge_ctrl_idx;
> +	u32				edge_ctrl[TPDM_DSB_MAX_EDCR];
> +	u32				edge_ctrl_mask[TPDM_DSB_MAX_EDCMR];

Please keep them aligned with the rest of the fields.

>   	bool			trig_ts;
>   	bool			trig_type;

Suzuki


>   };


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Re: [PATCH v7 10/13] coresight-tpdm: Add nodes to configure pattern match output

[Suzuki K Poulose]

On 25/07/2023 08:15, Tao Zhang wrote:
> Add nodes to configure trigger pattern and trigger pattern mask.
> Each DSB subunit TPDM has maximum of n(n<7) XPR registers to
> configure trigger pattern match output. Eight 32 bit registers
> providing DSB interface trigger output pattern match comparison.
> And each DSB subunit TPDM has maximum of m(m<7) XPMR registers to
> configure trigger pattern mask match output. Eight 32 bit
> registers providing DSB interface trigger output pattern match
> mask.
> 
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> ---
>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   |  34 +++++-
>   drivers/hwtracing/coresight/coresight-tpdm.c       | 118 +++++++++++++++++++++
>   drivers/hwtracing/coresight/coresight-tpdm.h       |  10 ++
>   3 files changed, 161 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index a4550c5..66f9582 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> @@ -98,4 +98,36 @@ Description:
>   		should be written first to configure the index number of the edge
>   		detection which needs to be masked.
>   
> -		Accepts only one of the 2 values -  0 or 1.
> \ No newline at end of file
> +		Accepts only one of the 2 values -  0 or 1.
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt_idx
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		Read/Write the index number of the trigger pattern value of DSB
> +		tpdm. Since there are at most 8 XPR and XPMR registers for the
> +		trigger parttern, this value ranges from 0 to 7.
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt_val
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		Read a set of the trigger pattern values of the DSB TPDM.
> +		Write a data to configure the trigger pattern corresponding to
> +		the index number. Before writing data to this sysfs file,
> +		"dsb_trig_patt_idx" should be written first to configure the
> +		index number of the trigger pattern which needs to be configured.
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt_mask
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		Read a set of the trigger pattern mask of the DSB TPDM.
> +		Write a data to configure the trigger pattern mask corresponding
> +		to the index number. Before writing data to this sysfs file,
> +		"dsb_trig_patt_idx" should be written first to configure the
> +		index number of the trigger pattern mask which needs to be
> +		configured.
> \ No newline at end of file
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index 98fd6ab..1c32d27 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -80,6 +80,13 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   		writel_relaxed(drvdata->dsb->edge_ctrl_mask[i],
>   			   drvdata->base + TPDM_DSB_EDCMR(i));
>   
> +	for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
> +		writel_relaxed(drvdata->dsb->trig_patt[i],
> +			    drvdata->base + TPDM_DSB_XPR(i));
> +		writel_relaxed(drvdata->dsb->trig_patt_mask[i],
> +			    drvdata->base + TPDM_DSB_XPMR(i));
> +	}
> +
>   	val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
>   	/* Set trigger timestamp */
>   	if (drvdata->dsb->trig_ts)
> @@ -455,6 +462,114 @@ static ssize_t dsb_edge_ctrl_mask_store(struct device *dev,
>   }
>   static DEVICE_ATTR_RW(dsb_edge_ctrl_mask);
>   
> +static ssize_t dsb_trig_patt_idx_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_patt_idx);
> +}
> +
> +static ssize_t dsb_trig_patt_idx_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 index;
> +
> +	if (kstrtoul(buf, 0, &index))
> +		return -EINVAL;
> +	if (index >= TPDM_DSB_MAX_PATT)
> +		return -EPERM;
> +
> +	spin_lock(&drvdata->spinlock);
> +	drvdata->dsb->trig_patt_idx = index;
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +static DEVICE_ATTR_RW(dsb_trig_patt_idx);
> +
> +static ssize_t dsb_trig_patt_val_show(struct device *dev,
> +					   struct device_attribute *attr,
> +					   char *buf)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +	ssize_t size = 0;
> +	unsigned long bytes;
> +	int i = 0;
> +
> +	spin_lock(&drvdata->spinlock);
> +	for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
> +		bytes = sysfs_emit_at(buf, size,
> +				  "Value: 0x%x\n", drvdata->dsb->trig_patt[i]);
> +		if (bytes <= 0)
> +			break;
> +		size += bytes;
> +	}
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +
> +static ssize_t dsb_trig_patt_val_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))
> +		return -EINVAL;
> +
> +	spin_lock(&drvdata->spinlock);
> +	drvdata->dsb->trig_patt[drvdata->dsb->trig_patt_idx] = val;
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +static DEVICE_ATTR_RW(dsb_trig_patt_val);
> +
> +static ssize_t dsb_trig_patt_mask_show(struct device *dev,
> +					    struct device_attribute *attr,
> +					    char *buf)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +	ssize_t size = 0;
> +	unsigned long bytes;
> +	int i = 0;
> +
> +	spin_lock(&drvdata->spinlock);
> +	for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
> +		bytes = sysfs_emit_at(buf, size,
> +			  "Value: 0x%x\n", drvdata->dsb->trig_patt_mask[i]);

As mentioned above, please stick to single value. In this case, we could 
simply expose :

dsb_trig_patt_mask0..7 as RW and directly let the user set/get the 
values and get rid of the idx.

You may be able to use an device_ext_attribute to store the index and 
use a single function to support all registers.

Suzuki


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Re: [PATCH v7 11/13] coresight-tpdm: Add nodes for timestamp request

[Suzuki K Poulose]

On 25/07/2023 08:15, Tao Zhang wrote:
> Add nodes to configure the timestamp request based on input
> pattern match. Each TPDM that support DSB subunit has maximum of
> n(n<7) TPR registers to configure value for timestamp request
> based on input pattern match. Eight 32 bit registers providing
> DSB interface timestamp request  pattern match comparison. And
> each TPDM that support DSB subunit has maximum of m(m<7) TPMR
> registers to configure pattern mask for timestamp request. Eight
> 32 bit registers providing DSB interface timestamp request
> pattern match mask generation. Add nodes to enable/disable
> pattern timestamp and set pattern timestamp type.
> 
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> ---
>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   |  57 +++++-
>   drivers/hwtracing/coresight/coresight-tpdm.c       | 205 ++++++++++++++++++++-
>   drivers/hwtracing/coresight/coresight-tpdm.h       |  16 ++
>   3 files changed, 272 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index 66f9582..74a0126 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> @@ -130,4 +130,59 @@ Description:
>   		to the index number. Before writing data to this sysfs file,
>   		"dsb_trig_patt_idx" should be written first to configure the
>   		index number of the trigger pattern mask which needs to be
> -		configured.
> \ No newline at end of file
> +		configured.
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_patt_idx
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		Read/Write the index number of the DSB tpdm pattern. Since
> +		there are at most 8 TPR and TPMR registers for the parttern,
> +		this value ranges from 0 to 7.

If it is only 0-7 and we read/write full registers, why not expose 
individual registers as mentioned in the previous comments and avoid
multi-line output for "show" routines. You may even group the registers
under a directory structure to avoid confusion.

e.g, :

	dsb_patt/
		\- mask0 ... mask7
		\- ts0 ... ts7
		\- type0 ... type7

	dsb_edge/
		\- edcr0 ... edcr15
		\- edcmr0 ... edcmr7
		\- ctrl_idx
		\- ctrl_idx_val
....



> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_patt_val
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		Read a set of the pattern values of the DSB TPDM. Write a data
> +		to configure the pattern corresponding to the index number.
> +		Before writing data to this sysfs file, "dsb_patt_idx" should be
> +		written first to configure the index number of the pattern which
> +		needs to be configured.
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_patt_mask
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		Read a set of the pattern mask values of the DSB TPDM. Write a
> +		data to configure the pattern mask corresponding to the index
> +		number. Before writing data to this sysfs file, "dsb_patt_idx"
> +		should be written first to configure the index number of the
> +		pattern mask which needs to be configured.
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_patt_ts
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		(Write) Set the pattern timestamp of DSB tpdm. Read
> +		the pattern timestamp of DSB tpdm.
> +
> +		Accepts only one of the 2 values -  0 or 1.
> +		0 : Disable DSB pattern timestamp.
> +		1 : Enable DSB pattern timestamp.
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_patt_type
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		(Write) Set the pattern type of DSB tpdm. Read
> +		the pattern type of DSB tpdm.
> +
> +		Accepts only one of the 2 values -  0 or 1.
> +		0 : Set the DSB pattern type to value.
> +		1 : Set the DSB pattern type to toggle.
> \ No newline at end of file
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index 1c32d27..f9e5a1d 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -69,6 +69,27 @@ static void set_dsb_perf_mode(struct tpdm_drvdata *drvdata, u32 *val)
>   		*val &= ~TPDM_DSB_CR_MODE;
>   }
>   
> +static void set_dsb_tier(struct tpdm_drvdata *drvdata, u32 *val)
> +{
> +	/* Set pattern timestamp type and enablement */
> +	if (drvdata->dsb->patt_ts) {
> +		*val |= TPDM_DSB_TIER_PATT_TSENAB;
> +		if (drvdata->dsb->patt_type)
> +			*val |= TPDM_DSB_TIER_PATT_TYPE;
> +		else
> +			*val &= ~TPDM_DSB_TIER_PATT_TYPE;
> +	} else {
> +		*val &= ~TPDM_DSB_TIER_PATT_TSENAB;
> +	}
> +
> +	/* Set trigger timestamp */
> +	if (drvdata->dsb->trig_ts)
> +		*val |= TPDM_DSB_TIER_XTRIG_TSENAB;
> +	else
> +		*val &= ~TPDM_DSB_TIER_XTRIG_TSENAB;
> +
> +}
> +
>   static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   {
>   	u32 val, i;
> @@ -81,6 +102,10 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   			   drvdata->base + TPDM_DSB_EDCMR(i));
>   
>   	for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
> +		writel_relaxed(drvdata->dsb->patt_val[i],
> +			    drvdata->base + TPDM_DSB_TPR(i));
> +		writel_relaxed(drvdata->dsb->patt_mask[i],
> +			    drvdata->base + TPDM_DSB_TPMR(i));
>   		writel_relaxed(drvdata->dsb->trig_patt[i],
>   			    drvdata->base + TPDM_DSB_XPR(i));
>   		writel_relaxed(drvdata->dsb->trig_patt_mask[i],
> @@ -88,11 +113,7 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   	}
>   
>   	val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
> -	/* Set trigger timestamp */
> -	if (drvdata->dsb->trig_ts)
> -		val |= TPDM_DSB_TIER_XTRIG_TSENAB;
> -	else
> -		val &= ~TPDM_DSB_TIER_XTRIG_TSENAB;
> +	set_dsb_tier(drvdata, &val);
>   	writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
>   
>   	val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
> @@ -462,6 +483,175 @@ static ssize_t dsb_edge_ctrl_mask_store(struct device *dev,
>   }
>   static DEVICE_ATTR_RW(dsb_edge_ctrl_mask);
>   
> +static ssize_t dsb_patt_idx_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->patt_idx);
> +
> +}
> +
> +static ssize_t dsb_patt_idx_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 index;
> +
> +	if ((kstrtoul(buf, 0, &index)) || (index >= TPDM_DSB_MAX_PATT))
> +		return -EINVAL;
> +
> +	spin_lock(&drvdata->spinlock);
> +	drvdata->dsb->patt_idx = index;
> +	spin_unlock(&drvdata->spinlock);
> +
> +	return size;
> +
> +}
> +static DEVICE_ATTR_RW(dsb_patt_idx);
> +
> +static ssize_t dsb_patt_val_show(struct device *dev,
> +				struct device_attribute *attr,
> +				char *buf)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +	ssize_t size = 0;
> +	unsigned long bytes;
> +	int i = 0;
> +
> +	spin_lock(&drvdata->spinlock);
> +	for (i = 0; i < TPDM_DSB_MAX_PATT; i++) {
> +		bytes = sysfs_emit_at(buf, size,
> +				  "Value: 0x%x\n", drvdata->dsb->patt_val[i]);

Please see my comment on the other patches.

> +		if (bytes <= 0)
> +			break;
> +		size += bytes;
> +	}
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +
> +static ssize_t dsb_patt_val_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))

You have used the base for all such conversions inconsistently,
throughout the series. You can always stick to 0.

$ git grep kstrtoul drivers/hwtracing/coresight/coresight-tpdm.c
drivers/hwtracing/coresight/coresight-tpdm.c:   ret = kstrtoul(buf, 10, 
&val);
drivers/hwtracing/coresight/coresight-tpdm.c:   ret = kstrtoul(buf, 10, 
&val);
drivers/hwtracing/coresight/coresight-tpdm.c:   if ((kstrtoul(buf, 0, 
&val)) || val < 0)
drivers/hwtracing/coresight/coresight-tpdm.c:   if ((kstrtoul(buf, 0, 
&val)) || (val >= TPDM_DSB_MAX_LINES))
drivers/hwtracing/coresight/coresight-tpdm.c:   if ((kstrtoul(buf, 0, 
&edge_ctrl)) || (edge_ctrl > 0x2))
drivers/hwtracing/coresight/coresight-tpdm.c:   if ((kstrtoul(buf, 0, 
&val)) || (val & ~1UL))
drivers/hwtracing/coresight/coresight-tpdm.c:   if ((kstrtoul(buf, 0, 
&val)) || (val & ~1UL))
drivers/hwtracing/coresight/coresight-tpdm.c:   if ((kstrtoul(buf, 0, 
&val)) || (val & ~1UL))



Suzuki



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Re: [PATCH v7 13/13] coresight-tpdm: Add nodes for dsb msr support

[Suzuki K Poulose]

On 25/07/2023 08:15, Tao Zhang wrote:
> Add the nodes for DSB subunit MSR(mux select register) support.
> The TPDM MSR (mux select register) interface is an optional
> interface and associated bank of registers per TPDM subunit.
> The intent of mux select registers is to control muxing structures
> driving the TPDM’s’ various subunit interfaces.
> 
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> ---
>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   | 19 ++++-
>   drivers/hwtracing/coresight/coresight-tpdm.c       | 98 ++++++++++++++++++++++
>   drivers/hwtracing/coresight/coresight-tpdm.h       |  7 ++
>   3 files changed, 123 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index 74a0126..ee41a14 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> @@ -185,4 +185,21 @@ Description:
>   
>   		Accepts only one of the 2 values -  0 or 1.
>   		0 : Set the DSB pattern type to value.
> -		1 : Set the DSB pattern type to toggle.
> \ No newline at end of file
> +		1 : Set the DSB pattern type to toggle.
> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_msr_idx
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		Read/Write the index number of MSR(mux select register) on DSB
> +		TPDM. This index number should not be greater than the number
> +		of MSR supported by this DSB TPDM.

How does a user find it ? Why don't we expose it ? Scratch all of that, 
you could create a register file per exising msr.

	dsb_msrs/msr0 ... msrN

You may :

1. either dynamically add files as you find the number

OR

2. If there is a hard limit, create that many files and control 
visibility based on the dynamic number.



> +
> +What:		/sys/bus/coresight/devices/<tpdm-name>/dsb_msr
> +Date:		March 2023
> +KernelVersion	6.5
> +Contact:	Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang (QUIC) <quic_taozha@quicinc.com>
> +Description:
> +		(Write) Set the MSR(mux select register) of DSB tpdm. Read
> +		the MSR(mux select register) of DSB tpdm.

(RW)

> \ No newline at end of file
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index f9e5a1d..be7776b 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -90,6 +90,18 @@ static void set_dsb_tier(struct tpdm_drvdata *drvdata, u32 *val)
>   
>   }
>   
> +static void set_dsb_msr(struct tpdm_drvdata *drvdata)
> +{
> +	int i;
> +


> +	if (drvdata->dsb->msr_num == 0)
> +		return;
> +
> +	for (i = 0; i < drvdata->dsb->msr_num; i++)
> +		writel_relaxed(drvdata->dsb->msr[i],
> +			   drvdata->base + TPDM_DSB_MSR(i));
> +}
> +
>   static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   {
>   	u32 val, i;
> @@ -116,6 +128,8 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>   	set_dsb_tier(drvdata, &val);
>   	writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
>   
> +	set_dsb_msr(drvdata);
> +
>   	val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
>   	/* Set the test accurate mode */
>   	set_dsb_test_mode(drvdata, &val);
> @@ -234,6 +248,14 @@ static int tpdm_datasets_setup(struct tpdm_drvdata *drvdata)
>   			if (!drvdata->dsb)
>   				return -ENOMEM;
>   		}
> +		if (!of_property_read_u32(drvdata->dev->of_node,
> +			   "qcom,dsb_msr_num", &drvdata->dsb->msr_num)) {
> +			drvdata->dsb->msr = devm_kzalloc(drvdata->dev, > +				   (drvdata->dsb->msr_num * sizeof(*drvdata->dsb->msr)),

			devm_kcalloc() ?

> +				   GFP_KERNEL);
> +			if (!drvdata->dsb->msr)
> +				return -ENOMEM;
> +		}
>   	}
>   
>   	return 0;
> @@ -830,6 +852,80 @@ static ssize_t dsb_trig_ts_store(struct device *dev,
>   }
>   static DEVICE_ATTR_RW(dsb_trig_ts);
>   
> +static ssize_t dsb_msr_idx_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->msr_idx);
> +
> +}
> +
> +static ssize_t dsb_msr_idx_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 index;
> +
> +	if (kstrtoul(buf, 0, &index))
> +		return -EINVAL;
> +	if (index >= drvdata->dsb->msr_num)
> +		return -EPERM;
> +
> +	spin_lock(&drvdata->spinlock);
> +	drvdata->dsb->msr_idx = index;
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +static DEVICE_ATTR_RW(dsb_msr_idx);
> +
> +static ssize_t dsb_msr_show(struct device *dev,
> +				 struct device_attribute *attr,
> +				 char *buf)
> +{
> +	struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
> +	unsigned int i;
> +	unsigned long bytes;
> +	ssize_t size = 0;
> +
> +	if (drvdata->dsb->msr_num == 0)
> +		return -EINVAL;
> +
> +	spin_lock(&drvdata->spinlock);
> +	for (i = 0; i < drvdata->dsb->msr_num; i++) {
> +		bytes = sysfs_emit_at(buf, size,
> +				  "0x%x\n", drvdata->dsb->msr[i]);

Single value per single file.

Suzuki


> +		if (bytes <= 0)
> +			break;
> +		size += bytes;
> +	}
> +	spin_unlock(&drvdata->spinlock);
> +
> +	return size;
> +}
> +
> +static ssize_t dsb_msr_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))
> +		return -EINVAL;
> +
> +	spin_lock(&drvdata->spinlock);
> +	drvdata->dsb->msr[drvdata->dsb->msr_idx] = val;
> +	spin_unlock(&drvdata->spinlock);
> +	return size;
> +}
> +static DEVICE_ATTR_RW(dsb_msr);
> +
>   static struct attribute *tpdm_dsb_attrs[] = {
>   	&dev_attr_dsb_mode.attr,
>   	&dev_attr_dsb_edge_ctrl_idx.attr,
> @@ -845,6 +941,8 @@ static struct attribute *tpdm_dsb_attrs[] = {
>   	&dev_attr_dsb_trig_patt_mask.attr,
>   	&dev_attr_dsb_trig_ts.attr,
>   	&dev_attr_dsb_trig_type.attr,
> +	&dev_attr_dsb_msr_idx.attr,
> +	&dev_attr_dsb_msr.attr,
>   	NULL,
>   };
>   
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
> index 7c52cf4..7b70db3 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
> @@ -18,6 +18,7 @@
>   #define TPDM_DSB_XPMR(n)	(0x7E8 + (n * 4))
>   #define TPDM_DSB_EDCR(n)	(0x808 + (n * 4))
>   #define TPDM_DSB_EDCMR(n)	(0x848 + (n * 4))
> +#define TPDM_DSB_MSR(n)		(0x980 + (n * 4))
>   
>   /* Enable bit for DSB subunit */
>   #define TPDM_DSB_CR_ENA		BIT(0)
> @@ -100,6 +101,9 @@
>    * @patt_mask:          Save value for pattern mask
>    * @trig_patt:          Save value for trigger pattern
>    * @trig_patt_mask:     Save value for trigger pattern mask
> + * @msr_num             Number of MSR supported by DSB TPDM
> + * @msr_idx             Index number of the MSR
> + * @msr                 Save value for MSR
>    * @patt_ts:            Enable/Disable pattern timestamp
>    * @patt_type:          Set pattern type
>    * @trig_ts:            Enable/Disable trigger timestamp.
> @@ -116,6 +120,9 @@ struct dsb_dataset {
>   	u32				patt_mask[TPDM_DSB_MAX_PATT];
>   	u32				trig_patt[TPDM_DSB_MAX_PATT];
>   	u32				trig_patt_mask[TPDM_DSB_MAX_PATT];
> +	u32				msr_num;
> +	u32				msr_idx;
> +	u32				*msr;
>   	bool			patt_ts;
>   	bool			patt_type;
>   	bool			trig_ts;


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Re: [PATCH v7 04/13] coresight-tpda: Add DSB dataset support

[Tao Zhang]

Hi Suzuki,

On 8/4/2023 11:02 PM, Suzuki K Poulose wrote:
> On 25/07/2023 08:15, Tao Zhang wrote:
>> Read the DSB element size from the device tree. Set the register
>> bit that controls the DSB element size of the corresponding port.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-tpda.c | 96 
>> +++++++++++++++++++++++++---
>>   drivers/hwtracing/coresight/coresight-tpda.h |  4 ++
>>   2 files changed, 90 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c 
>> b/drivers/hwtracing/coresight/coresight-tpda.c
>> index 8d2b9d2..7c71342 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>> @@ -21,6 +21,58 @@
>>     DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda");
>>   +/* Search and read element data size from the TPDM node in
>
> minor nit:
>
> /*
>  * Search ...
I will update this in the next patch series.
>
>> + * the devicetree. Each input port of TPDA is connected to
>> + * a TPDM. Different TPDM supports different types of dataset,
>> + * and some may support more than one type of dataset.
>> + * Parameter "inport" is used to pass in the input port number
>> + * of TPDA, and it is set to 0 in the recursize call.
>
>> + * Parameter "parent" is used to pass in the original call.
>
> Please remove references to the past and describe "match_inport"
I will update this in the next patch series.
>
>> + */
>> +static int tpda_set_element_size(struct tpda_drvdata *drvdata,
>> +               struct coresight_device *csdev, int inport, bool 
>> match_inport)
>
> May be we could switch the order of the parameters:
>
> match_inport, int port
>
> Or even inport < 0, implies, port wont be matched.
>
> i.e.,
>
> tpda_set_element_size(drvdata, child, inport)
I will update this in the next patch series.
>
>> +{
>> +    static int nr_inport;
>> +    int i;
>> +    static bool tpdm_found;
>> +    struct coresight_device *in_csdev;
>> +
>> +    if (inport > (TPDA_MAX_INPORTS - 1))
>> +        return -EINVAL;
>> +
>> +    if (match_inport) {
>> +        nr_inport = inport;
>> +        tpdm_found = false;
>> +    }
>
> Could we not avoid the static variables and this dance by making the 
> function return the dsb_size ? See further down.
>
I will update this in the next patch series.
>
>> +
>> +    for (i = 0; i < csdev->pdata->nr_inconns; i++) {
>> +        in_csdev = csdev->pdata->in_conns[i]->src_dev;
>> +        if (!in_csdev)
>> +            break;
>         continue ?
I will update this in the next patch series.
>> +
>> +        if (match_inport)
>> +            if (csdev->pdata->in_conns[i]->dest_port != inport)
>> +                continue;
>> +
>> +        if ((in_csdev->type == CORESIGHT_DEV_TYPE_SOURCE) &&
>> +                (in_csdev->subtype.source_subtype
>> +                == CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM)) {
>
> Please provide a helper :
>
> static bool coresight_device_is_tpdm(csdev) {
>     return
>      (csdev->type == CORESIGHT_DEV_TYPE_SOURCE) &&
>      (in_csdev->subtype.source_subtype ==
>         CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
> }
>
I will update this in the next patch series.
>
>
>> + of_property_read_u8(in_csdev->dev.parent->of_node,
>> +                    "qcom,dsb-element-size", 
>> &drvdata->dsb_esize[nr_inport]);
>
>
>
>> +            if (!tpdm_found)
>> +                tpdm_found = true;
>> +            else
>> +                dev_warn(drvdata->dev,
>> +                    "More than one TPDM is mapped to the TPDA input 
>> port %d.\n",
>> +                    nr_inport);
>> +            continue;
>> +        }
>> +        tpda_set_element_size(drvdata, in_csdev, 0, false);
>> +    }
>> +
>
> /*
>  * Read the DSB element size from the TPDM device
>  * Returns
>  *    the size read from the firmware if available.
>  *    0 - Otherwise, with a Warning once.
>  */
> static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
> {
>     int rc, size = 0;
>
>     rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>                      "qcom,dsb-element-size", &size);
>     if (rc)
>         dev_warn_once(&in->dev, "Failed to read TPDM DSB Element size: 
> %d\n",
>         rc);
>     return size;
> }
>
> static int tpda_get_element_size(struct coresight_device *csdev,
>                  int inport)
> {
>     int dsb_size = -ENOENT;
>
>     for (i = 0; i < csdev->pdata->nr_inconns; i++) {
>         in = csdev->pdata->in_conns[i]->src_dev;
>         if (!in)
>             continue;
>         if (coresight_device_is_tpdm(in)) {
>             /* Ignore the TPDMs that do not match port */
>             if (inport > 0 &&
>                 (csdev->pdata->in_conns[i]->dest_port !=
>                 inport))
>                 continue;
>             size = tpdm_read_dsb_element_size(csdev);
>         } else {
>             /* Recurse down the path */
>             size = tpda_set_element_size(in, -1);
>         }
>
>         if (size < 0)
>             return size;
>         /* We have found a size, save it. */
>         if (dsb_size < 0) {
>             dsb_size = size;
>         } else {
>             /* We have duplicate TPDMs */
>             return -EEXIST;
>         }
>     }
>     return dsb_size;
> }
>
I will update this in the next patch series.
>
>
>
>> +    return 0;
>> +}
>> +
>>   /* Settings pre enabling port control register */
>>   static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
>>   {
>> @@ -32,26 +84,43 @@ static void tpda_enable_pre_port(struct 
>> tpda_drvdata *drvdata)
>>       writel_relaxed(val, drvdata->base + TPDA_CR);
>>   }
>>   -static void tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>> +static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>>   {
>>       u32 val;
>>         val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
>> +    /*
>> +     * Configure aggregator port n DSB data set element size
>> +     * Set the bit to 0 if the size is 32
>> +     * Set the bit to 1 if the size is 64
>> +     */
>> +    if (drvdata->dsb_esize[port] == 32)
>> +        val &= ~TPDA_Pn_CR_DSBSIZE;
>> +    else if (drvdata->dsb_esize[port] == 64)
>> +        val |= TPDA_Pn_CR_DSBSIZE;
>
> Couldn't this be detected via tpda_get_element_size()? see below.
I will update this in the next patch series.
>
>> +    else
>> +        return -EINVAL;
>> +
>>       /* Enable the port */
>>       val |= TPDA_Pn_CR_ENA;
>>       writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>> +
>> +    return 0;
>>   }
>>   -static void __tpda_enable(struct tpda_drvdata *drvdata, int port)
>> +static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
>>   {
>> +    int ret;
>> +
>>       CS_UNLOCK(drvdata->base);
>>         if (!drvdata->csdev->enable)
>>           tpda_enable_pre_port(drvdata);
>>   -    tpda_enable_port(drvdata, port);
>> -
>> +    ret = tpda_enable_port(drvdata, port);
>>       CS_LOCK(drvdata->base);
>> +
>> +    return ret;
>>   }
>>     static int tpda_enable(struct coresight_device *csdev,
>> @@ -59,16 +128,23 @@ static int tpda_enable(struct coresight_device 
>> *csdev,
>>                  struct coresight_connection *out)
>>   {
>>       struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>> +    int ret;
>> +
>> +    ret = tpda_set_element_size(drvdata, csdev, in->dest_port, true);
>
>     size  = tpda_get_element_size(csdev, in->dest_port);
>     switch (size) {
>     case 32:
>     case 64:
>         break;
>     case -EEXIST:
>         dev_warn_once("Detected multiple TPDMs on port %d", ..)
>         fallthrough;
>     default:
>         return size;
>     }
>
>     drvdata->dsb_esize[in->dest_port] = size;

I will update this in the next patch series.


Best,

Tao

>
> Suzuki
>
>
>
>> +    if (ret)
>> +        return ret;
>>         spin_lock(&drvdata->spinlock);
>> -    if (atomic_read(&in->dest_refcnt) == 0)
>> -        __tpda_enable(drvdata, in->dest_port);
>> +    if (atomic_read(&in->dest_refcnt) == 0) {
>> +        ret = __tpda_enable(drvdata, in->dest_port);
>> +        if (!ret) {
>> +            atomic_inc(&in->dest_refcnt);
>> +            dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", 
>> in->dest_port);
>> +        }
>> +    }
>>   -    atomic_inc(&in->dest_refcnt);
>>       spin_unlock(&drvdata->spinlock);
>> -
>> -    dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port);
>> -    return 0;
>> +    return ret;
>>   }
>>     static void __tpda_disable(struct tpda_drvdata *drvdata, int port)
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h 
>> b/drivers/hwtracing/coresight/coresight-tpda.h
>> index 0399678..12a1472 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpda.h
>> +++ b/drivers/hwtracing/coresight/coresight-tpda.h
>> @@ -10,6 +10,8 @@
>>   #define TPDA_Pn_CR(n)        (0x004 + (n * 4))
>>   /* Aggregator port enable bit */
>>   #define TPDA_Pn_CR_ENA        BIT(0)
>> +/* Aggregator port DSB data set element size bit */
>> +#define TPDA_Pn_CR_DSBSIZE        BIT(8)
>>     #define TPDA_MAX_INPORTS    32
>>   @@ -23,6 +25,7 @@
>>    * @csdev:      component vitals needed by the framework.
>>    * @spinlock:   lock for the drvdata value.
>>    * @enable:     enable status of the component.
>> + * @dsb_esize:  DSB element size for each inport, it must be 32 or 64.
>>    */
>>   struct tpda_drvdata {
>>       void __iomem        *base;
>> @@ -30,6 +33,7 @@ struct tpda_drvdata {
>>       struct coresight_device    *csdev;
>>       spinlock_t        spinlock;
>>       u8            atid;
>> +    u8            dsb_esize[TPDA_MAX_INPORTS];
>>   };
>>     #endif  /* _CORESIGHT_CORESIGHT_TPDA_H */
>

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Re: [PATCH v7 04/13] coresight-tpda: Add DSB dataset support

[Tao Zhang]

On 8/7/2023 5:12 PM, Suzuki K Poulose wrote:
> On 04/08/2023 16:02, Suzuki K Poulose wrote:
>> On 25/07/2023 08:15, Tao Zhang wrote:
>>> Read the DSB element size from the device tree. Set the register
>>> bit that controls the DSB element size of the corresponding port.
>>>
>>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>>> ---
>>>   drivers/hwtracing/coresight/coresight-tpda.c | 96 
>>> +++++++++++++++++++++++++---
>>>   drivers/hwtracing/coresight/coresight-tpda.h |  4 ++
>>>   2 files changed, 90 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c 
>>> b/drivers/hwtracing/coresight/coresight-tpda.c
>>> index 8d2b9d2..7c71342 100644
>>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>>> @@ -21,6 +21,58 @@
>>>   DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda");
>>> +/* Search and read element data size from the TPDM node in
>>
>> minor nit:
>>
>> /*
>>   * Search ...
>>
>>> + * the devicetree. Each input port of TPDA is connected to
>>> + * a TPDM. Different TPDM supports different types of dataset,
>>> + * and some may support more than one type of dataset.
>>> + * Parameter "inport" is used to pass in the input port number
>>> + * of TPDA, and it is set to 0 in the recursize call.
>>
>>> + * Parameter "parent" is used to pass in the original call.
>>
>> Please remove references to the past and describe "match_inport"
>>
>>> + */
>>> +static int tpda_set_element_size(struct tpda_drvdata *drvdata,
>>> +               struct coresight_device *csdev, int inport, bool 
>>> match_inport)
>>
>> May be we could switch the order of the parameters:
>>
>> match_inport, int port
>>
>> Or even inport < 0, implies, port wont be matched.
>>
>> i.e.,
>>
>> tpda_set_element_size(drvdata, child, inport)
>>
>>> +{
>>> +    static int nr_inport;
>>> +    int i;
>>> +    static bool tpdm_found;
>>> +    struct coresight_device *in_csdev;
>>> +
>>> +    if (inport > (TPDA_MAX_INPORTS - 1))
>>> +        return -EINVAL;
>>> +
>>> +    if (match_inport) {
>>> +        nr_inport = inport;
>>> +        tpdm_found = false;
>>> +    }
>>
>> Could we not avoid the static variables and this dance by making the 
>> function return the dsb_size ? See further down.
>>
>>
>>> +
>>> +    for (i = 0; i < csdev->pdata->nr_inconns; i++) {
>>> +        in_csdev = csdev->pdata->in_conns[i]->src_dev;
>>> +        if (!in_csdev)
>>> +            break;
>>          continue ?
>>> +
>>> +        if (match_inport)
>>> +            if (csdev->pdata->in_conns[i]->dest_port != inport)
>>> +                continue;
>>> +
>>> +        if ((in_csdev->type == CORESIGHT_DEV_TYPE_SOURCE) &&
>>> +                (in_csdev->subtype.source_subtype
>>> +                == CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM)) {
>>
>> Please provide a helper :
>>
>> static bool coresight_device_is_tpdm(csdev) {
>>      return
>>       (csdev->type == CORESIGHT_DEV_TYPE_SOURCE) &&
>>       (in_csdev->subtype.source_subtype ==
>>          CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
>> }
>>
>>
>>
>>> + of_property_read_u8(in_csdev->dev.parent->of_node,
>>> +                    "qcom,dsb-element-size", 
>>> &drvdata->dsb_esize[nr_inport]);
>>
>>
>>
>>> +            if (!tpdm_found)
>>> +                tpdm_found = true;
>>> +            else
>>> +                dev_warn(drvdata->dev,
>>> +                    "More than one TPDM is mapped to the TPDA input 
>>> port %d.\n",
>>> +                    nr_inport);
>>> +            continue;
>>> +        }
>>> +        tpda_set_element_size(drvdata, in_csdev, 0, false);
>>> +    }
>>> +
>>
>> /*
>>   * Read the DSB element size from the TPDM device
>>   * Returns
>>   *    the size read from the firmware if available.
>>   *    0 - Otherwise, with a Warning once.
>>   */
>> static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
>> {
>>      int rc, size = 0;
>>
>>      rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>>                       "qcom,dsb-element-size", &size);
>>      if (rc)
>>          dev_warn_once(&in->dev, "Failed to read TPDM DSB Element 
>> size: %d\n",
>>          rc);
>>      return size;
>> }
>>
>> static int tpda_get_element_size(struct coresight_device *csdev,
>>                   int inport)
>> {
>>      int dsb_size = -ENOENT;
>>
>>      for (i = 0; i < csdev->pdata->nr_inconns; i++) {
>>          in = csdev->pdata->in_conns[i]->src_dev;
>>          if (!in)
>>              continue;
>>          if (coresight_device_is_tpdm(in)) {
>>              /* Ignore the TPDMs that do not match port */
>>              if (inport > 0 &&
>>                  (csdev->pdata->in_conns[i]->dest_port !=
>>                  inport))
>>                  continue;
>>              size = tpdm_read_dsb_element_size(csdev);
>>          } else {
>>              /* Recurse down the path */
>>              size = tpda_set_element_size(in, -1);
>>          }
>>
>>          if (size < 0)
>>              return size;
>>          /* We have found a size, save it. */
>>          if (dsb_size < 0) {
>>              dsb_size = size;
>>          } else {
>>              /* We have duplicate TPDMs */
>>              return -EEXIST;
>>          }
>>      }
>>      return dsb_size;
>> }
>>
>>
>>
>>
>>> +    return 0;
>>> +}
>>> +
>>>   /* Settings pre enabling port control register */
>>>   static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
>>>   {
>>> @@ -32,26 +84,43 @@ static void tpda_enable_pre_port(struct 
>>> tpda_drvdata *drvdata)
>>>       writel_relaxed(val, drvdata->base + TPDA_CR);
>>>   }
>>> -static void tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>>> +static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>>>   {
>>>       u32 val;
>>>       val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
>>> +    /*
>>> +     * Configure aggregator port n DSB data set element size
>>> +     * Set the bit to 0 if the size is 32
>>> +     * Set the bit to 1 if the size is 64
>>> +     */
>>> +    if (drvdata->dsb_esize[port] == 32)
>>> +        val &= ~TPDA_Pn_CR_DSBSIZE;
>>> +    else if (drvdata->dsb_esize[port] == 64)
>>> +        val |= TPDA_Pn_CR_DSBSIZE;
>>
>> Couldn't this be detected via tpda_get_element_size()? see below.
>>
>>> +    else
>>> +        return -EINVAL;
>>> +
>>>       /* Enable the port */
>>>       val |= TPDA_Pn_CR_ENA;
>>>       writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>>> +
>>> +    return 0;
>>>   }
>>> -static void __tpda_enable(struct tpda_drvdata *drvdata, int port)
>>> +static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
>>>   {
>>> +    int ret;
>>> +
>>>       CS_UNLOCK(drvdata->base);
>>>       if (!drvdata->csdev->enable)
>>>           tpda_enable_pre_port(drvdata);
>>> -    tpda_enable_port(drvdata, port);
>>> -
>>> +    ret = tpda_enable_port(drvdata, port);
>>>       CS_LOCK(drvdata->base);
>>> +
>>> +    return ret;
>>>   }
>>>   static int tpda_enable(struct coresight_device *csdev,
>>> @@ -59,16 +128,23 @@ static int tpda_enable(struct coresight_device 
>>> *csdev,
>>>                  struct coresight_connection *out)
>>>   {
>>>       struct tpda_drvdata *drvdata = 
>>> dev_get_drvdata(csdev->dev.parent);
>>> +    int ret;
>>> +
>>> +    ret = tpda_set_element_size(drvdata, csdev, in->dest_port, true);
>>
>>      size  = tpda_get_element_size(csdev, in->dest_port);
>>      switch (size) {
>>      case 32:
>>      case 64:
>>          break;
>
> We also need :
>
>     case 0:
>         return -ENOENT;

I will update this in the next patch series.


Best,

Tao

>
> Suzuki
>
>
>>      case -EEXIST:
>>          dev_warn_once("Detected multiple TPDMs on port %d", ..)
>>          fallthrough;
>>      default:
>>          return size;
>>      }
>>
>>      drvdata->dsb_esize[in->dest_port] = size;
>>
>> Suzuki
>>
>>
>>
>>> +    if (ret)
>>> +        return ret;
>>>       spin_lock(&drvdata->spinlock);
>>> -    if (atomic_read(&in->dest_refcnt) == 0)
>>> -        __tpda_enable(drvdata, in->dest_port);
>>> +    if (atomic_read(&in->dest_refcnt) == 0) {
>>> +        ret = __tpda_enable(drvdata, in->dest_port);
>>> +        if (!ret) {
>>> +            atomic_inc(&in->dest_refcnt);
>>> +            dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", 
>>> in->dest_port);
>>> +        }
>>> +    }
>>> -    atomic_inc(&in->dest_refcnt);
>>>       spin_unlock(&drvdata->spinlock);
>>> -
>>> -    dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port);
>>> -    return 0;
>>> +    return ret;
>>>   }
>>>   static void __tpda_disable(struct tpda_drvdata *drvdata, int port)
>>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h 
>>> b/drivers/hwtracing/coresight/coresight-tpda.h
>>> index 0399678..12a1472 100644
>>> --- a/drivers/hwtracing/coresight/coresight-tpda.h
>>> +++ b/drivers/hwtracing/coresight/coresight-tpda.h
>>> @@ -10,6 +10,8 @@
>>>   #define TPDA_Pn_CR(n)        (0x004 + (n * 4))
>>>   /* Aggregator port enable bit */
>>>   #define TPDA_Pn_CR_ENA        BIT(0)
>>> +/* Aggregator port DSB data set element size bit */
>>> +#define TPDA_Pn_CR_DSBSIZE        BIT(8)
>>>   #define TPDA_MAX_INPORTS    32
>>> @@ -23,6 +25,7 @@
>>>    * @csdev:      component vitals needed by the framework.
>>>    * @spinlock:   lock for the drvdata value.
>>>    * @enable:     enable status of the component.
>>> + * @dsb_esize:  DSB element size for each inport, it must be 32 or 64.
>>>    */
>>>   struct tpda_drvdata {
>>>       void __iomem        *base;
>>> @@ -30,6 +33,7 @@ struct tpda_drvdata {
>>>       struct coresight_device    *csdev;
>>>       spinlock_t        spinlock;
>>>       u8            atid;
>>> +    u8            dsb_esize[TPDA_MAX_INPORTS];
>>>   };
>>>   #endif  /* _CORESIGHT_CORESIGHT_TPDA_H */
>>
>

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Re: [PATCH v7 05/13] coresight-tpdm: Initialize DSB subunit configuration

[Tao Zhang]

On 8/7/2023 5:28 PM, Suzuki K Poulose wrote:
> On 25/07/2023 08:15, Tao Zhang wrote:
>> DSB is used for monitoring “events”. Events are something that
>> occurs at some point in time. It could be a state decode, the
>> act of writing/reading a particular address, a FIFO being empty,
>> etc. This decoding of the event desired is done outside TPDM.
>> DSB subunit need to be configured in enablement and disablement.
>> A struct that specifics associated to dsb dataset is needed. It
>> saves the configuration and parameters of the dsb datasets. This
>> change is to add this struct and initialize the configuration of
>> DSB subunit.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-tpdm.c | 55 
>> ++++++++++++++++++++++++++--
>>   drivers/hwtracing/coresight/coresight-tpdm.h | 18 +++++++++
>>   2 files changed, 69 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c 
>> b/drivers/hwtracing/coresight/coresight-tpdm.c
>> index abaff0b..52aa48a6 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
>> @@ -20,17 +20,46 @@
>>     DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm");
>>   +static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
>> +{
>> +    if (drvdata->datasets & TPDM_PIDR0_DS_DSB) {
>
> Do we need a helper for this, we seem to be doing this more than once ?
>
> tpdm_has_dsb_dataset(drvdata) ?
Sure, I will update this in the next patch series.
>
>> +        memset(drvdata->dsb, 0, sizeof(struct dsb_dataset));
>> +
>> +        drvdata->dsb->trig_ts = true;
>> +        drvdata->dsb->trig_type = false;
>> +    }
>> +}
>> +
>>   static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>>   {
>>       u32 val;
>>   -    /* Set the enable bit of DSB control register to 1 */
>> +    val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
>> +    /* Set trigger timestamp */
>> +    if (drvdata->dsb->trig_ts)
>> +        val |= TPDM_DSB_TIER_XTRIG_TSENAB;
>> +    else
>> +        val &= ~TPDM_DSB_TIER_XTRIG_TSENAB;
>> +    writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
>> +
>>       val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
>> +    /* Set trigger type */
>> +    if (drvdata->dsb->trig_type)
>> +        val |= TPDM_DSB_CR_TRIG_TYPE;
>> +    else
>> +        val &= ~TPDM_DSB_CR_TRIG_TYPE;
>> +    /* Set the enable bit of DSB control register to 1 */
>>       val |= TPDM_DSB_CR_ENA;
>>       writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
>>   }
>>   -/* TPDM enable operations */
>> +/* TPDM enable operations
>
> minor nit:
>
> /*
>  * TPDM enable..
I will update this in the next patch series.
>
>> + * The TPDM or Monitor serves as data collection component for various
>> + * dataset types. It covers Basic Counts(BC), Tenure Counts(TC),
>> + * Continuous Multi-Bit(CMB), Multi-lane CMB(MCMB) and Discrete Single
>> + * Bit(DSB). This function will initialize the configuration according
>> + * to the dataset type supported by the TPDM.
>> + */
>>   static void __tpdm_enable(struct tpdm_drvdata *drvdata)
>>   {
>>       CS_UNLOCK(drvdata->base);
>> @@ -110,13 +139,24 @@ static const struct coresight_ops tpdm_cs_ops = {
>>       .source_ops    = &tpdm_source_ops,
>>   };
>>   -static void tpdm_init_default_data(struct tpdm_drvdata *drvdata)
>> +static int tpdm_datasets_setup(struct tpdm_drvdata *drvdata)
>>   {
>>       u32 pidr;
>>         /*  Get the datasets present on the TPDM. */
>>       pidr = readl_relaxed(drvdata->base + CORESIGHT_PERIPHIDR0);
>>       drvdata->datasets |= pidr & GENMASK(TPDM_DATASETS - 1, 0);
>> +
>> +    if (drvdata->datasets & TPDM_PIDR0_DS_DSB) {
>> +        if (!drvdata->dsb) {
>
> This could be :
>
>     if (tpdm_has_dsb_dataset(drvdata) && !drvdata->dsb) {
I will update this in the next patch series.
>> +            drvdata->dsb = devm_kzalloc(drvdata->dev,
>> +                            sizeof(*drvdata->dsb), GFP_KERNEL);
>> +            if (!drvdata->dsb)
>> +                return -ENOMEM;
>
>     }
>
>> +        }
>> +    }
>
> Could we move the reset datasets here ?
>     tpdm_reset_datasets(drvdata);
I will update this in the next patch series.
>
>> +
>> +    return 0;
>>   }
>>     /*
>> @@ -179,6 +219,7 @@ static int tpdm_probe(struct amba_device *adev, 
>> const struct amba_id *id)
>>       struct coresight_platform_data *pdata;
>>       struct tpdm_drvdata *drvdata;
>>       struct coresight_desc desc = { 0 };
>> +    int ret;
>>         pdata = coresight_get_platform_data(dev);
>>       if (IS_ERR(pdata))
>> @@ -198,6 +239,12 @@ static int tpdm_probe(struct amba_device *adev, 
>> const struct amba_id *id)
>>         drvdata->base = base;
>>   +    ret = tpdm_datasets_setup(drvdata);
>> +    if (ret)
>> +        return ret;
>> +
>> +    tpdm_reset_datasets(drvdata);
>
> ^^ We could move this to datasets_setup(), see above.
I will update this in the next patch series.
>
>> +
>>       /* Set up coresight component description */
>>       desc.name = coresight_alloc_device_name(&tpdm_devs, dev);
>>       if (!desc.name)
>> @@ -214,7 +261,7 @@ static int tpdm_probe(struct amba_device *adev, 
>> const struct amba_id *id)
>>           return PTR_ERR(drvdata->csdev);
>>         spin_lock_init(&drvdata->spinlock);
>> -    tpdm_init_default_data(drvdata);
>> +
>>       /* Decrease pm refcount when probe is done.*/
>>       pm_runtime_put(&adev->dev);
>>   diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h 
>> b/drivers/hwtracing/coresight/coresight-tpdm.h
>> index 5438540..92c34cd 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
>> @@ -11,8 +11,14 @@
>>     /* DSB Subunit Registers */
>>   #define TPDM_DSB_CR        (0x780)
>> +#define TPDM_DSB_TIER        (0x784)
>> +
>>   /* Enable bit for DSB subunit */
>>   #define TPDM_DSB_CR_ENA        BIT(0)
>> +/* Enable bit for DSB subunit trigger type */
>> +#define TPDM_DSB_CR_TRIG_TYPE        BIT(12)
>> +/* Enable bit for DSB subunit trigger timestamp */
>> +#define TPDM_DSB_TIER_XTRIG_TSENAB        BIT(1)
>>     /* TPDM integration test registers */
>>   #define TPDM_ITATBCNTRL        (0xEF0)
>> @@ -41,6 +47,16 @@
>>   #define TPDM_PIDR0_DS_DSB    BIT(1)
>>     /**
>> + * struct dsb_dataset - specifics associated to dsb dataset
>> + * @trig_ts:          Enable/Disable trigger timestamp.
>> + * @trig_type:        Enable/Disable trigger type.
>> + */
>> +struct dsb_dataset {
>> +    bool            trig_ts;
>> +    bool            trig_type;
>> +};
>> +
>> +/**
>>    * struct tpdm_drvdata - specifics associated to an TPDM component
>>    * @base:       memory mapped base address for this component.
>>    * @dev:        The device entity associated to this component.
>> @@ -48,6 +64,7 @@
>>    * @spinlock:   lock for the drvdata value.
>>    * @enable:     enable status of the component.
>>    * @datasets:   The datasets types present of the TPDM.
>> + * @dsb         Specifics associated to an TPDM component.
>
>             TPDM DSB related settings ?

I will update this in the next patch series.


Best,

Tao

>
> Suzuki
>
>
>>    */
>>     struct tpdm_drvdata {
>> @@ -57,6 +74,7 @@ struct tpdm_drvdata {
>>       spinlock_t        spinlock;
>>       bool            enable;
>>       unsigned long        datasets;
>> +    struct dsb_dataset    *dsb;
>>   };
>>     #endif  /* _CORESIGHT_CORESIGHT_TPDM_H */
>

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Re: [PATCH v7 06/13] coresight-tpdm: Add reset node to TPDM node

[Tao Zhang]

On 8/7/2023 5:36 PM, Suzuki K Poulose wrote:
> On 25/07/2023 08:15, Tao Zhang wrote:
>> 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 ?
Sure, 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)
>
I will update this in the next patch series.


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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Re: [PATCH v7 07/13] coresight-tpdm: Add nodes to set trigger timestamp and type

[Tao Zhang]

On 8/7/2023 5:42 PM, Suzuki K Poulose wrote:
> On 25/07/2023 08:15, 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       | 94 
>> ++++++++++++++++++++++
>>   2 files changed, 118 insertions(+)
>>
>> diff --git 
>> a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm 
>> b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> index dbc2fbd0..0b7b4ad 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    6.5
>> +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.
>
> Please use: (RW) instead of (Write).
>
>         (RW) Set/Get the trigger type of the DSB for TPDM.
> Similarly for the items below.
I will update this in the next patch series.
>
>> +
>> +        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
>> +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 acc3eea..62efc18 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
>> @@ -20,6 +20,18 @@
>>     DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm");
>>   +static umode_t tpdm_dsb_is_visible(struct kobject *kobj,
>> +                       struct attribute *attr, int n)
>
> Please keep the alignment.
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 && (drvdata->datasets & TPDM_PIDR0_DS_DSB))
>
> As suggested earlier, add a wrapper for the above check.
I will update this in the next patch series.
>
>> +        return attr->mode;
>> +
>> +    return 0;
>> +}
>> +
>>   static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
>>   {
>>       if (drvdata->datasets & TPDM_PIDR0_DS_DSB) {
>> @@ -229,8 +241,90 @@ 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)
>
> Please follow the above alignment for all functions throughout the 
> series. There are unaligned parameter lists scattered around the series.

I will update this in the next patch series.


Best,

Tao

>
>> +{
>> +    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.
>
> Suzuk
>

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Re: [PATCH v7 09/13] coresight-tpdm: Add nodes for dsb edge control

[Tao Zhang]

On 8/7/2023 5:24 PM, Suzuki K Poulose wrote:
> On 25/07/2023 08:15, Tao Zhang wrote:
>> Add the nodes to set value for DSB edge control and DSB edge
>> control mask. Each DSB subunit TPDM has maximum of n(n<16) EDCR
>> resgisters to configure edge control. DSB edge detection control
>> 00: Rising edge detection
>> 01: Falling edge detection
>> 10: Rising and falling edge detection (toggle detection)
>> And each DSB subunit TPDM has maximum of m(m<8) ECDMR registers to
>> configure mask. Eight 32 bit registers providing DSB interface
>> edge detection mask control.
>>
>> Add the nodes to configure DSB edge control and DSB edge control
>> mask. Each DSB subunit TPDM maximum of 256 edge detections can be
>> configured. The index and value sysfs files need to be paired and
>> written to order. The index sysfs file is to set the index number
>> of the edge detection which needs to be configured. And the value
>> sysfs file is to set the control or mask for the edge detection.
>> DSB edge detection control should be set as the following values.
>> 00: Rising edge detection
>> 01: Falling edge detection
>> 10: Rising and falling edge detection (toggle detection)
>> And DSB edge mask should be set as 0 or 1.
>> Each DSB subunit TPDM has maximum of n(n<16) EDCR resgisters to
>> configure edge control. And each DSB subunit TPDM has maximum of
>> m(m<8) ECDMR registers to configure mask.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>> ---
>>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   |  39 +++++
>>   drivers/hwtracing/coresight/coresight-tpdm.c       | 158 
>> ++++++++++++++++++++-
>>   drivers/hwtracing/coresight/coresight-tpdm.h       |  30 +++-
>>   3 files changed, 223 insertions(+), 4 deletions(-)
>>
>> diff --git 
>> a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm 
>> b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> index 2a82cd0..a4550c5 100644
>> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> @@ -60,3 +60,42 @@ Description:
>>           Bit[3] : Set to 0 for low performance mode.
>>                    Set to 1 for high performance mode.
>>           Bit[4:8] : Select byte lane for high performance mode.
>> +
>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge_ctrl_idx
>> +Date:        March 2023
>> +KernelVersion    6.5
>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang 
>> (QUIC) <quic_taozha@quicinc.com>
>> +Description:
>> +        Read/Write the index number of the edge detection for the DSB
>> +        subunit TPDM. Since there are at most 256 edge detections, this
>> +        value ranges from 0 to 255.
>> +
>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge_ctrl_val
>> +Date:        March 2023
>> +KernelVersion    6.5
>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang 
>> (QUIC) <quic_taozha@quicinc.com>
>> +Description:
>> +        Read a set of the edge control registers of the DSB in TPDM.
>> +        Write a data to control the edge detection corresponding to
>> +        the index number. Before writing data to this sysfs file,
>> +        "dsb_edge_ctrl_idx" should be written first to configure the
>> +        index number of the edge detection which needs to be 
>> controlled.
>> +
>> +        Accepts only one of the following values.
>> +        0 - Rising edge detection
>> +        1 - Falling edge detection
>> +        2 - Rising and falling edge detection (toggle detection)
>> +
>> +
>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge_ctrl_mask
>> +Date:        March 2023
>> +KernelVersion    6.5
>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang 
>> (QUIC) <quic_taozha@quicinc.com>
>> +Description:
>> +        Read a set of the edge control mask registers of the DSB in 
>> TPDM.
>> +        Write a data to mask the edge detection corresponding to the 
>> index
>> +        number. Before writing data to this sysfs file, 
>> "dsb_edge_ctrl_idx"
>> +        should be written first to configure the index number of the 
>> edge
>> +        detection which needs to be masked.
>> +
>> +        Accepts only one of the 2 values -  0 or 1.
>> \ No newline at end of file
>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c 
>> b/drivers/hwtracing/coresight/coresight-tpdm.c
>> index c38760b..98fd6ab 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
>> @@ -71,7 +71,14 @@ static void set_dsb_perf_mode(struct tpdm_drvdata 
>> *drvdata, u32 *val)
>>     static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>>   {
>> -    u32 val;
>> +    u32 val, i;
>> +
>> +    for (i = 0; i < TPDM_DSB_MAX_EDCR; i++)
>> +        writel_relaxed(drvdata->dsb->edge_ctrl[i],
>> +               drvdata->base + TPDM_DSB_EDCR(i));
>> +    for (i = 0; i < TPDM_DSB_MAX_EDCMR; i++)
>> +        writel_relaxed(drvdata->dsb->edge_ctrl_mask[i],
>> +               drvdata->base + TPDM_DSB_EDCMR(i));
>>         val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
>>       /* Set trigger timestamp */
>> @@ -302,6 +309,152 @@ static ssize_t dsb_mode_store(struct device *dev,
>>   }
>>   static DEVICE_ATTR_RW(dsb_mode);
>>   +static ssize_t dsb_edge_ctrl_idx_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->edge_ctrl_idx);
>> +}
>> +
>> +/*
>> + * The EDCR registers can include up to 16 32-bit registers, and each
>> + * one can be configured to control up to 16 edge detections(2 bits
>> + * control one edge detection). So a total 256 edge detections can be
>> + * configured. This function provides a way to set the index number of
>> + * the edge detection which needs to be configured.
>> + */
>> +static ssize_t dsb_edge_ctrl_idx_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 >= TPDM_DSB_MAX_LINES))
>> +        return -EINVAL;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    drvdata->dsb->edge_ctrl_idx = val;
>> +    spin_unlock(&drvdata->spinlock);
>> +
>> +    return size;
>> +}
>> +static DEVICE_ATTR_RW(dsb_edge_ctrl_idx);
>> +
>> +static ssize_t dsb_edge_ctrl_val_show(struct device *dev,
>> +                       struct device_attribute *attr,
>> +                       char *buf)
>> +{
>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +    ssize_t size = 0;
>> +    unsigned long bytes;
>> +    int i;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    for (i = 0; i < TPDM_DSB_MAX_EDCR; i++) {
>> +        bytes = sysfs_emit_at(buf, size,
>> +                  "Val:0x%x\n", drvdata->dsb->edge_ctrl[i]);
>> +        if (bytes <= 0)
>> +            break;
>> +        size += bytes;
>> +    }
>> +    spin_unlock(&drvdata->spinlock);
>> +    return size;
>> +}
>> +
>> +/*
>> + * This function is used to control the edge detection according
>> + * to the index number that has been set.
>> + * "edge_ctrl" should be one of the following values.
>> + * 0 - Rising edge detection
>> + * 1 - Falling edge detection
>> + * 2 - Rising and falling edge detection (toggle detection)
>> + */
>> +static ssize_t dsb_edge_ctrl_val_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, mask, edge_ctrl;
>> +    int reg;
>> +
>> +    if ((kstrtoul(buf, 0, &edge_ctrl)) || (edge_ctrl > 0x2))
>> +        return -EINVAL;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    /*
>> +     * There are 2 bit per DSB Edge Control line.
>> +     * Thus we have 16 lines in a 32bit word.
>> +     */
>> +    reg = EDCR_TO_WORD_IDX(drvdata->dsb->edge_ctrl_idx);
>> +    mask = EDCR_TO_WORD_MASK(drvdata->dsb->edge_ctrl_idx);
>> +    val = drvdata->dsb->edge_ctrl[reg];
>> +    val &= ~EDCR_TO_WORD_MASK(drvdata->dsb->edge_ctrl_idx);
>> +    val |= EDCR_TO_WORD_VAL(edge_ctrl, drvdata->dsb->edge_ctrl_idx);
>> +    drvdata->dsb->edge_ctrl[reg] = val;
>> +    spin_unlock(&drvdata->spinlock);
>> +
>> +    return size;
>> +}
>> +static DEVICE_ATTR_RW(dsb_edge_ctrl_val);
>> +
>> +static ssize_t dsb_edge_ctrl_mask_show(struct device *dev,
>> +                        struct device_attribute *attr,
>> +                        char *buf)
>> +{
>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +    ssize_t size = 0;
>> +    unsigned long bytes;
>> +    int i;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    for (i = 0; i < TPDM_DSB_MAX_EDCMR; i++) {
>> +        bytes = sysfs_emit_at(buf, size,
>> +                  "Val:0x%x\n", drvdata->dsb->edge_ctrl_mask[i]);
>> +        if (bytes <= 0)
>> +            break;
>> +        size += bytes;
>> +    }
>> +    spin_unlock(&drvdata->spinlock);
>> +    return size;
>> +}
>> +
>> +static ssize_t dsb_edge_ctrl_mask_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;
>> +    u32 set;
>> +    int reg;
>> +
>> +    if ((kstrtoul(buf, 0, &val)) || (val & ~1UL))
>> +        return -EINVAL;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    /*
>> +     * There is 1 bit per DSB Edge Control Mark line.
>> +     * Thus we have 32 lines in a 32bit word.
>> +     */
>> +    reg = EDCMR_TO_WORD_IDX(drvdata->dsb->edge_ctrl_idx);
>> +    set = drvdata->dsb->edge_ctrl_mask[reg];
>> +    if (val)
>> +        set |= BIT(EDCMR_TO_WORD_SHIFT(drvdata->dsb->edge_ctrl_idx));
>> +    else
>> +        set &= ~BIT(EDCMR_TO_WORD_SHIFT(drvdata->dsb->edge_ctrl_idx));
>> +        drvdata->dsb->edge_ctrl_mask[reg] = set;
>
>
> drivers/hwtracing/coresight/coresight-tpdm.c: In function 
> ‘dsb_edge_ctrl_mask_store’:
> drivers/hwtracing/coresight/coresight-tpdm.c:449:2: error: this ‘else’ 
> clause does not guard... [-Werror=misleading-indentation]
>   else
>   ^~~~
> drivers/hwtracing/coresight/coresight-tpdm.c:451:3: note: ...this 
> statement, but the latter is misleadingly indented as if it were 
> guarded by the ‘else’
>    drvdata->dsb->edge_ctrl_mask[reg] = set;
>    ^~~~~~~
> cc1: all warnings being treated as errors
> make[4]: *** [scripts/Makefile.build:243: 
> drivers/hwtracing/coresight/coresight-tpdm.o] Error 1
> make[3]: *** [scripts/Makefile.build:480: drivers/hwtracing/coresight] 
> Error 2
> make[2]: *** [scripts/Makefile.build:480: drivers] Error 2
> make[1]: *** [/ssd/src/LINUX-CORESIGHT/Makefile:2032: .] Error 2
> make: *** [Makefile:234: __sub-make] Error 2
>
I will update this in the next patch series.


Best,

Tao

> Suzuki

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Re: [PATCH v7 09/13] coresight-tpdm: Add nodes for dsb edge control

[Tao Zhang]

On 8/7/2023 6:58 PM, Suzuki K Poulose wrote:
> On 25/07/2023 08:15, Tao Zhang wrote:
>> Add the nodes to set value for DSB edge control and DSB edge
>> control mask. Each DSB subunit TPDM has maximum of n(n<16) EDCR
>> resgisters to configure edge control. DSB edge detection control
>> 00: Rising edge detection
>> 01: Falling edge detection
>> 10: Rising and falling edge detection (toggle detection)
>> And each DSB subunit TPDM has maximum of m(m<8) ECDMR registers to
>> configure mask. Eight 32 bit registers providing DSB interface
>> edge detection mask control.
>>
>> Add the nodes to configure DSB edge control and DSB edge control
>> mask. Each DSB subunit TPDM maximum of 256 edge detections can be
>> configured. The index and value sysfs files need to be paired and
>> written to order. The index sysfs file is to set the index number
>> of the edge detection which needs to be configured. And the value
>> sysfs file is to set the control or mask for the edge detection.
>> DSB edge detection control should be set as the following values.
>> 00: Rising edge detection
>> 01: Falling edge detection
>> 10: Rising and falling edge detection (toggle detection)
>> And DSB edge mask should be set as 0 or 1.
>> Each DSB subunit TPDM has maximum of n(n<16) EDCR resgisters to
>> configure edge control. And each DSB subunit TPDM has maximum of
>> m(m<8) ECDMR registers to configure mask.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>> ---
>>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   |  39 +++++
>>   drivers/hwtracing/coresight/coresight-tpdm.c       | 158 
>> ++++++++++++++++++++-
>>   drivers/hwtracing/coresight/coresight-tpdm.h       |  30 +++-
>>   3 files changed, 223 insertions(+), 4 deletions(-)
>>
>> diff --git 
>> a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm 
>> b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> index 2a82cd0..a4550c5 100644
>> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> @@ -60,3 +60,42 @@ Description:
>>           Bit[3] : Set to 0 for low performance mode.
>>                    Set to 1 for high performance mode.
>>           Bit[4:8] : Select byte lane for high performance mode.
>> +
>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge_ctrl_idx
>> +Date:        March 2023
>> +KernelVersion    6.5
>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang 
>> (QUIC) <quic_taozha@quicinc.com>
>> +Description:
>> +        Read/Write the index number of the edge detection for the DSB
>> +        subunit TPDM. Since there are at most 256 edge detections, this
>> +        value ranges from 0 to 255.
>> +
>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge_ctrl_val
>> +Date:        March 2023
>> +KernelVersion    6.5
>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang 
>> (QUIC) <quic_taozha@quicinc.com>
>> +Description:
>> +        Read a set of the edge control registers of the DSB in TPDM.
>> +        Write a data to control the edge detection corresponding to
>> +        the index number. Before writing data to this sysfs file,
>> +        "dsb_edge_ctrl_idx" should be written first to configure the
>> +        index number of the edge detection which needs to be 
>> controlled.
>> +
>> +        Accepts only one of the following values.
>> +        0 - Rising edge detection
>> +        1 - Falling edge detection
>> +        2 - Rising and falling edge detection (toggle detection)
>> +
>> +
>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_edge_ctrl_mask
>> +Date:        March 2023
>> +KernelVersion    6.5
>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang 
>> (QUIC) <quic_taozha@quicinc.com>
>> +Description:
>> +        Read a set of the edge control mask registers of the DSB in 
>> TPDM.
>> +        Write a data to mask the edge detection corresponding to the 
>> index
>> +        number. Before writing data to this sysfs file, 
>> "dsb_edge_ctrl_idx"
>> +        should be written first to configure the index number of the 
>> edge
>> +        detection which needs to be masked.
>> +
>> +        Accepts only one of the 2 values -  0 or 1.
>> \ No newline at end of file
>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c 
>> b/drivers/hwtracing/coresight/coresight-tpdm.c
>> index c38760b..98fd6ab 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
>> @@ -71,7 +71,14 @@ static void set_dsb_perf_mode(struct tpdm_drvdata 
>> *drvdata, u32 *val)
>>     static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>>   {
>> -    u32 val;
>> +    u32 val, i;
>> +
>> +    for (i = 0; i < TPDM_DSB_MAX_EDCR; i++)
>> +        writel_relaxed(drvdata->dsb->edge_ctrl[i],
>> +               drvdata->base + TPDM_DSB_EDCR(i));
>> +    for (i = 0; i < TPDM_DSB_MAX_EDCMR; i++)
>> +        writel_relaxed(drvdata->dsb->edge_ctrl_mask[i],
>> +               drvdata->base + TPDM_DSB_EDCMR(i));
>>         val = readl_relaxed(drvdata->base + TPDM_DSB_TIER);
>>       /* Set trigger timestamp */
>> @@ -302,6 +309,152 @@ static ssize_t dsb_mode_store(struct device *dev,
>>   }
>>   static DEVICE_ATTR_RW(dsb_mode);
>>   +static ssize_t dsb_edge_ctrl_idx_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->edge_ctrl_idx);
>> +}
>> +
>> +/*
>> + * The EDCR registers can include up to 16 32-bit registers, and each
>> + * one can be configured to control up to 16 edge detections(2 bits
>> + * control one edge detection). So a total 256 edge detections can be
>> + * configured. This function provides a way to set the index number of
>> + * the edge detection which needs to be configured.
>> + */
>> +static ssize_t dsb_edge_ctrl_idx_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 >= TPDM_DSB_MAX_LINES))
>> +        return -EINVAL;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    drvdata->dsb->edge_ctrl_idx = val;
>> +    spin_unlock(&drvdata->spinlock);
>> +
>> +    return size;
>> +}
>> +static DEVICE_ATTR_RW(dsb_edge_ctrl_idx);
>> +
>> +static ssize_t dsb_edge_ctrl_val_show(struct device *dev,
>> +                       struct device_attribute *attr,
>> +                       char *buf)
>> +{
>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +    ssize_t size = 0;
>> +    unsigned long bytes;
>> +    int i;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    for (i = 0; i < TPDM_DSB_MAX_EDCR; i++) {
>> +        bytes = sysfs_emit_at(buf, size,
>> +                  "Val:0x%x\n", drvdata->dsb->edge_ctrl[i]);
>
> This feels a bit odd. edget_ctrl_val allows storing one "edge ctrl"
> value, while "show"ing all EDCR values. We could split them to :
>
> Read only sysfs files:
>
> dsb_edcr0 ... dsb_edcr15
>
> for each EDCR register (similarly for the mask)
>
> and may be show the specific edge_ctrl_line for with the above 
> function for selected index.
Sure, I will update this in the next patch series.
>
>> +        if (bytes <= 0)
>> +            break;
>> +        size += bytes;
>> +    }
>> +    spin_unlock(&drvdata->spinlock);
>> +    return size;
>> +}
>> +
>> +/*
>> + * This function is used to control the edge detection according
>> + * to the index number that has been set.
>> + * "edge_ctrl" should be one of the following values.
>> + * 0 - Rising edge detection
>> + * 1 - Falling edge detection
>> + * 2 - Rising and falling edge detection (toggle detection)
>> + */
>> +static ssize_t dsb_edge_ctrl_val_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, mask, edge_ctrl;
>> +    int reg;
>> +
>> +    if ((kstrtoul(buf, 0, &edge_ctrl)) || (edge_ctrl > 0x2))
>> +        return -EINVAL;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    /*
>> +     * There are 2 bit per DSB Edge Control line.
>> +     * Thus we have 16 lines in a 32bit word.
>> +     */
>> +    reg = EDCR_TO_WORD_IDX(drvdata->dsb->edge_ctrl_idx);
>> +    mask = EDCR_TO_WORD_MASK(drvdata->dsb->edge_ctrl_idx);
>> +    val = drvdata->dsb->edge_ctrl[reg];
>> +    val &= ~EDCR_TO_WORD_MASK(drvdata->dsb->edge_ctrl_idx);
>> +    val |= EDCR_TO_WORD_VAL(edge_ctrl, drvdata->dsb->edge_ctrl_idx);
>> +    drvdata->dsb->edge_ctrl[reg] = val;
>> +    spin_unlock(&drvdata->spinlock);
>> +
>> +    return size;
>> +}
>> +static DEVICE_ATTR_RW(dsb_edge_ctrl_val);
>
> This can be WO attribute to write to a given line.
I will update this in the next patch series.
>
>> +
>> +static ssize_t dsb_edge_ctrl_mask_show(struct device *dev,
>> +                        struct device_attribute *attr,
>> +                        char *buf)
>> +{
>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +    ssize_t size = 0;
>> +    unsigned long bytes;
>> +    int i;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    for (i = 0; i < TPDM_DSB_MAX_EDCMR; i++) {
>> +        bytes = sysfs_emit_at(buf, size,
>> +                  "Val:0x%x\n", drvdata->dsb->edge_ctrl_mask[i]);
>
> As mentioned above, please don't do this. One value per file. Add
>
> dsb_edcmr0..dsb_edcmr7
>
> and print only the selected index mask for this function.
I will update this in the next patch series.
>
>> +        if (bytes <= 0)
>> +            break;
>> +        size += bytes;
>> +    }
>> +    spin_unlock(&drvdata->spinlock);
>> +    return size;
>> +}
>> +
>> +static ssize_t dsb_edge_ctrl_mask_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;
>> +    u32 set;
>> +    int reg;
>> +
>> +    if ((kstrtoul(buf, 0, &val)) || (val & ~1UL))
>> +        return -EINVAL;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    /*
>> +     * There is 1 bit per DSB Edge Control Mark line.
>> +     * Thus we have 32 lines in a 32bit word.
>> +     */
>> +    reg = EDCMR_TO_WORD_IDX(drvdata->dsb->edge_ctrl_idx);
>> +    set = drvdata->dsb->edge_ctrl_mask[reg];
>> +    if (val)
>> +        set |= BIT(EDCMR_TO_WORD_SHIFT(drvdata->dsb->edge_ctrl_idx));
>> +    else
>> +        set &= ~BIT(EDCMR_TO_WORD_SHIFT(drvdata->dsb->edge_ctrl_idx));
>> +        drvdata->dsb->edge_ctrl_mask[reg] = set;
>> +    spin_unlock(&drvdata->spinlock);
>> +
>> +    return size;
>> +}
>> +static DEVICE_ATTR_RW(dsb_edge_ctrl_mask);
>> +
>>   static ssize_t dsb_trig_type_show(struct device *dev,
>>                        struct device_attribute *attr, char *buf)
>>   {
>> @@ -374,6 +527,9 @@ static DEVICE_ATTR_RW(dsb_trig_ts);
>>     static struct attribute *tpdm_dsb_attrs[] = {
>>       &dev_attr_dsb_mode.attr,
>> +    &dev_attr_dsb_edge_ctrl_idx.attr,
>> +    &dev_attr_dsb_edge_ctrl_val.attr,
>> +    &dev_attr_dsb_edge_ctrl_mask.attr,
>>       &dev_attr_dsb_trig_ts.attr,
>>       &dev_attr_dsb_trig_type.attr,
>>       NULL,
>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h 
>> b/drivers/hwtracing/coresight/coresight-tpdm.h
>> index 49fffb1..4afdb29 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
>> @@ -12,6 +12,8 @@
>>   /* DSB Subunit Registers */
>>   #define TPDM_DSB_CR        (0x780)
>>   #define TPDM_DSB_TIER        (0x784)
>> +#define TPDM_DSB_EDCR(n)    (0x808 + (n * 4))
>> +#define TPDM_DSB_EDCMR(n)    (0x848 + (n * 4))
>>     /* Enable bit for DSB subunit */
>>   #define TPDM_DSB_CR_ENA        BIT(0)
>> @@ -34,6 +36,16 @@
>>   #define TPDM_DSB_TEST_MODE        GENMASK(10, 9)
>>   #define TPDM_DSB_HPSEL        GENMASK(6, 2)
>>   +#define EDCRS_PER_WORD                16
>> +#define EDCR_TO_WORD_IDX(r)            ((r) / EDCRS_PER_WORD)
>> +#define EDCR_TO_WORD_SHIFT(r)        ((r % EDCRS_PER_WORD) * 2)
>> +#define EDCR_TO_WORD_VAL(val, r)    (val << EDCR_TO_WORD_SHIFT(r))
>> +#define EDCR_TO_WORD_MASK(r)        EDCR_TO_WORD_VAL(0x3, r)
>> +
>> +#define EDCMRS_PER_WORD                32
>> +#define EDCMR_TO_WORD_IDX(r)        ((r) / EDCMRS_PER_WORD)
>> +#define EDCMR_TO_WORD_SHIFT(r)        ((r) % EDCMRS_PER_WORD)
>> +
>>   /* TPDM integration test registers */
>>   #define TPDM_ITATBCNTRL        (0xEF0)
>>   #define TPDM_ITCNTRL        (0xF00)
>> @@ -60,14 +72,26 @@
>>   #define TPDM_PIDR0_DS_IMPDEF    BIT(0)
>>   #define TPDM_PIDR0_DS_DSB    BIT(1)
>>   +#define TPDM_DSB_MAX_LINES    256
>> +/* MAX number of EDCR registers */
>> +#define TPDM_DSB_MAX_EDCR    16
>> +/* MAX number of EDCMR registers */
>> +#define TPDM_DSB_MAX_EDCMR    8
>> +
>>   /**
>>    * struct dsb_dataset - specifics associated to dsb dataset
>> - * @mode:             DSB programming mode
>> - * @trig_ts:          Enable/Disable trigger timestamp.
>> - * @trig_type:        Enable/Disable trigger type.
>> + * @mode:               DSB programming mode
>> + * @edge_ctrl_idx       Index number of the edge control
>> + * @edge_ctrl:          Save value for edge control
>> + * @edge_ctrl_mask:     Save value for edge control mask
>> + * @trig_ts:            Enable/Disable trigger timestamp.
>> + * @trig_type:          Enable/Disable trigger type.
>>    */
>>   struct dsb_dataset {
>>       u32                mode;
>> +    u32                edge_ctrl_idx;
>> +    u32                edge_ctrl[TPDM_DSB_MAX_EDCR];
>> +    u32                edge_ctrl_mask[TPDM_DSB_MAX_EDCMR];
>
> Please keep them aligned with the rest of the fields.

I will update this in the next patch series.


Best,

Tao

>
>>       bool            trig_ts;
>>       bool            trig_type;
>
> Suzuki
>
>
>>   };
>

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Re: [PATCH v7 06/13] coresight-tpdm: Add reset node to TPDM node

[Tao Zhang]

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:
>>> 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 ?
> Sure, 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)
>>
> I will update this in the next patch series.
>
>
> 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

>
>>
>>> +{
>>> +    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
>>
> _______________________________________________
> CoreSight mailing list -- coresight@lists.linaro.org
> To unsubscribe send an email to coresight-leave@lists.linaro.org

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Re: [PATCH v7 08/13] coresight-tpdm: Add node to set dsb programming mode

[Tao Zhang]

On 8/7/2023 6:00 PM, Suzuki K Poulose wrote:
> On 25/07/2023 08:15, Tao Zhang wrote:
>> Add node to set and show programming mode for TPDM DSB subunit.
>> Once the DSB programming mode is set, it will be written to the
>> register DSB_CR.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>> ---
>>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   | 15 ++++++
>>   drivers/hwtracing/coresight/coresight-tpdm.c       | 62 
>> ++++++++++++++++++++++
>>   drivers/hwtracing/coresight/coresight-tpdm.h       | 16 ++++++
>>   3 files changed, 93 insertions(+)
>>
>> diff --git 
>> a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm 
>> b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> index 0b7b4ad..2a82cd0 100644
>> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> @@ -45,3 +45,18 @@ Description:
>>           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_mode
>> +Date:        March 2023
>> +KernelVersion    6.5
>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang 
>> (QUIC) <quic_taozha@quicinc.com>
>> +Description:
>> +        (Write) Set the mode of DSB tpdm. Read the mode of DSB
>> +        tpdm.
>
> (RW) ...
Sure, I will update this to the next patch series.
>
>> +
>> +        Accepts the value needs to be greater than 0. What data
>> +        bits do is listed below.
>> +        Bit[0:1] : Test mode control bit for choosing the inputs.
>> +        Bit[3] : Set to 0 for low performance mode.
>> +                 Set to 1 for high performance mode.
>> +        Bit[4:8] : Select byte lane for high performance mode.
>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c 
>> b/drivers/hwtracing/coresight/coresight-tpdm.c
>> index 62efc18..c38760b 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
>> @@ -4,6 +4,7 @@
>>    */
>>     #include <linux/amba/bus.h>
>> +#include <linux/bitfield.h>
>>   #include <linux/bitmap.h>
>>   #include <linux/coresight.h>
>>   #include <linux/coresight-pmu.h>
>> @@ -42,6 +43,32 @@ static void tpdm_reset_datasets(struct 
>> tpdm_drvdata *drvdata)
>>       }
>>   }
>>   +static void set_dsb_test_mode(struct tpdm_drvdata *drvdata, u32 *val)
>> +{
>> +    u32 mode;
>> +
>> +    mode = TPDM_DSB_MODE_TEST(drvdata->dsb->mode);
>> +    *val &= ~TPDM_DSB_TEST_MODE;
>> +    *val |= FIELD_PREP(TPDM_DSB_TEST_MODE, mode);
>> +}
>> +
>> +static void set_dsb_hpsel_mode(struct tpdm_drvdata *drvdata, u32 *val)
>> +{
>> +    u32 mode;
>> +
>> +    mode = TPDM_DSB_MODE_HPBYTESEL(drvdata->dsb->mode);
>> +    *val &= ~TPDM_DSB_HPSEL;
>> +    *val |= FIELD_PREP(TPDM_DSB_HPSEL, mode);
>> +}
>> +
>> +static void set_dsb_perf_mode(struct tpdm_drvdata *drvdata, u32 *val)
>> +{
>> +    if (drvdata->dsb->mode & TPDM_DSB_MODE_PERF)
>> +        *val |= TPDM_DSB_CR_MODE;
>> +    else
>> +        *val &= ~TPDM_DSB_CR_MODE;
>> +}
>> +
>>   static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>>   {
>>       u32 val;
>> @@ -55,6 +82,12 @@ static void tpdm_enable_dsb(struct tpdm_drvdata 
>> *drvdata)
>>       writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
>>         val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
>
>> +    /* Set the test accurate mode */
>> +    set_dsb_test_mode(drvdata, &val);
>> +    /* Set the byte lane for high-performance mode */
>> +    set_dsb_hpsel_mode(drvdata, &val);
>> +    /* Set the performance mode */
>> +    set_dsb_perf_mode(drvdata, &val);
>
> Couldn't all of them be combined to a single function, as they
> operate on a single value to be written ?
>
>     set_dsb_mode(drvdata, &val);
>
Yes, I will update this to the next patch series.
>
>>       /* Set trigger type */
>>       if (drvdata->dsb->trig_type)
>>           val |= TPDM_DSB_CR_TRIG_TYPE;
>> @@ -241,6 +274,34 @@ static struct attribute_group tpdm_attr_grp = {
>>       .attrs = tpdm_attrs,
>>   };
>>   +static ssize_t dsb_mode_show(struct device *dev,
>> +                  struct device_attribute *attr,
>> +                  char *buf)
>> +{
>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +
>> +    return sysfs_emit(buf, "%lx\n",
>> +             (unsigned long)drvdata->dsb->mode);
>
> It is u32 anyways, hence why not :
>
>         (buf, "%x\n", drvdata->dsb->mode) ?
>
Sure, I will update this to the next patch series.
>
>> +}
>> +
>> +static ssize_t dsb_mode_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 < 0)
>> +        return -EINVAL;
>> +
>
> Is it not an error :
>      if (val & ~TPDM_DSB_MODE_MASK) ?

We don't need to care about the data bits besides TPDM_DSB_MODE_MASK.

Do you think it is necessary to add this check?

If so, I can add this check in the next patch series.

>
>> +    spin_lock(&drvdata->spinlock);
>> +    drvdata->dsb->mode = val & TPDM_DSB_MODE_MASK;
>> +    spin_unlock(&drvdata->spinlock);
>> +    return size;
>> +}
>> +static DEVICE_ATTR_RW(dsb_mode);
>> +
>>   static ssize_t dsb_trig_type_show(struct device *dev,
>>                        struct device_attribute *attr, char *buf)
>>   {
>> @@ -312,6 +373,7 @@ static ssize_t dsb_trig_ts_store(struct device *dev,
>>   static DEVICE_ATTR_RW(dsb_trig_ts);
>>     static struct attribute *tpdm_dsb_attrs[] = {
>> +    &dev_attr_dsb_mode.attr,
>>       &dev_attr_dsb_trig_ts.attr,
>>       &dev_attr_dsb_trig_type.attr,
>>       NULL,
>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h 
>> b/drivers/hwtracing/coresight/coresight-tpdm.h
>> index 92c34cd..49fffb1 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
>> @@ -15,11 +15,25 @@
>>     /* Enable bit for DSB subunit */
>>   #define TPDM_DSB_CR_ENA        BIT(0)
>> +/* Enable bit for DSB subunit perfmance mode */
>> +#define TPDM_DSB_CR_MODE        BIT(1)
>>   /* Enable bit for DSB subunit trigger type */
>>   #define TPDM_DSB_CR_TRIG_TYPE        BIT(12)
>> +
>>   /* Enable bit for DSB subunit trigger timestamp */
>>   #define TPDM_DSB_TIER_XTRIG_TSENAB        BIT(1)
>>   +/* DSB programming modes */
>> +/* Test mode control bit*/
>> +#define TPDM_DSB_MODE_TEST(val)    (val & GENMASK(1, 0))
>
> What is the difference between MODE_TEST ^ and the TEST_MODE ( below ).
> Please could we have clear naming conventions ?

"TPDM_DSB_MODE_TEST" is to collect the data of test mode from user space 
input.

"TPDM_DSB_TEST_MODE" is to set the data bits collected by 
"TPDM_DSB_MODE_TEST"

to "TPDM_DSB_CR" register.

I will prefix the macro which is related to "TPDM_DSB_CR" to identify.

>
>> +/* Performance mode */
>> +#define TPDM_DSB_MODE_PERF        BIT(3)
>
>> +/* High performance mode */
>> +#define TPDM_DSB_MODE_HPBYTESEL(val)    (val & GENMASK(8, 4))
>> +#define TPDM_DSB_MODE_MASK            GENMASK(8, 0)
>
>
>> +#define TPDM_DSB_TEST_MODE GENMASK(10, 9)
>> +#define TPDM_DSB_HPSEL        GENMASK(6, 2)
>
> Ah, I read it again and these two are really TPDM_DSB_CR_x and
> 1) Must be defined as such (to avoid any confusion as above)
> 2) And defined closer to the other value defintions for the registers ?

Sure, I will update this according to your advice in the next patch series.


Best,

Tao

>
>
> Suzuki
>
>> +
>>   /* TPDM integration test registers */
>>   #define TPDM_ITATBCNTRL        (0xEF0)
>>   #define TPDM_ITCNTRL        (0xF00)
>> @@ -48,10 +62,12 @@
>>     /**
>>    * struct dsb_dataset - specifics associated to dsb dataset
>> + * @mode:             DSB programming mode
>>    * @trig_ts:          Enable/Disable trigger timestamp.
>>    * @trig_type:        Enable/Disable trigger type.
>>    */
>>   struct dsb_dataset {
>> +    u32                mode;
>>       bool            trig_ts;
>>       bool            trig_type;
>>   };
>

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Re: [PATCH v7 06/13] coresight-tpdm: Add reset node to TPDM node

[Suzuki K Poulose]

On 14/08/2023 08:08, Tao Zhang wrote:
> 
> On 8/13/2023 11:38 PM, Tao Zhang wrote:
>>
>> 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:
>>>>> 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 ?
>>> Sure, 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)
>>>>
>>> I will update this in the next patch series.
>>>
>>>
>>> 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.

It is not about the mail client, I am looking at the code with this 
series applied to the code.

>>
>> 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."

Yes, this is what I expect.

Suzuki


> 
> 
> 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
>>>>
>>> _______________________________________________
>>> CoreSight mailing list -- coresight@lists.linaro.org
>>> To unsubscribe send an email to coresight-leave@lists.linaro.org
>> _______________________________________________
>> CoreSight mailing list -- coresight@lists.linaro.org
>> To unsubscribe send an email to coresight-leave@lists.linaro.org


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Re: [PATCH v7 13/13] coresight-tpdm: Add nodes for dsb msr support

[Tao Zhang]

On 8/7/2023 7:35 PM, Suzuki K Poulose wrote:
> On 25/07/2023 08:15, Tao Zhang wrote:
>> Add the nodes for DSB subunit MSR(mux select register) support.
>> The TPDM MSR (mux select register) interface is an optional
>> interface and associated bank of registers per TPDM subunit.
>> The intent of mux select registers is to control muxing structures
>> driving the TPDM’s’ various subunit interfaces.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>> ---
>>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   | 19 ++++-
>>   drivers/hwtracing/coresight/coresight-tpdm.c       | 98 
>> ++++++++++++++++++++++
>>   drivers/hwtracing/coresight/coresight-tpdm.h       |  7 ++
>>   3 files changed, 123 insertions(+), 1 deletion(-)
>>
>> diff --git 
>> a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm 
>> b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> index 74a0126..ee41a14 100644
>> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> @@ -185,4 +185,21 @@ Description:
>>             Accepts only one of the 2 values -  0 or 1.
>>           0 : Set the DSB pattern type to value.
>> -        1 : Set the DSB pattern type to toggle.
>> \ No newline at end of file
>> +        1 : Set the DSB pattern type to toggle.
>> +
>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_msr_idx
>> +Date:        March 2023
>> +KernelVersion    6.5
>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang 
>> (QUIC) <quic_taozha@quicinc.com>
>> +Description:
>> +        Read/Write the index number of MSR(mux select register) on DSB
>> +        TPDM. This index number should not be greater than the number
>> +        of MSR supported by this DSB TPDM.
>
> How does a user find it ? Why don't we expose it ? Scratch all of 
> that, you could create a register file per exising msr.
>
>     dsb_msrs/msr0 ... msrN
>
> You may :
>
> 1. either dynamically add files as you find the number
>
> OR
>
> 2. If there is a hard limit, create that many files and control 
> visibility based on the dynamic number.
>
Hi Suzuki,


With regards to your suggestions, would you mind if you provide some 
sample code for my reference?

1. How to dynamically add files to the sysfs as I find the number?

2. The hard limit of MSR should be 32. How can I control visibility 
based on the dynamic number?

>
>
>> +
>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_msr
>> +Date:        March 2023
>> +KernelVersion    6.5
>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang 
>> (QUIC) <quic_taozha@quicinc.com>
>> +Description:
>> +        (Write) Set the MSR(mux select register) of DSB tpdm. Read
>> +        the MSR(mux select register) of DSB tpdm.
>
> (RW)
Sure, I will update this in the next patch series.
>
>> \ No newline at end of file
>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c 
>> b/drivers/hwtracing/coresight/coresight-tpdm.c
>> index f9e5a1d..be7776b 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
>> @@ -90,6 +90,18 @@ static void set_dsb_tier(struct tpdm_drvdata 
>> *drvdata, u32 *val)
>>     }
>>   +static void set_dsb_msr(struct tpdm_drvdata *drvdata)
>> +{
>> +    int i;
>> +
>
>
>> +    if (drvdata->dsb->msr_num == 0)
>> +        return;
>> +
>> +    for (i = 0; i < drvdata->dsb->msr_num; i++)
>> +        writel_relaxed(drvdata->dsb->msr[i],
>> +               drvdata->base + TPDM_DSB_MSR(i));
>> +}
>> +
>>   static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>>   {
>>       u32 val, i;
>> @@ -116,6 +128,8 @@ static void tpdm_enable_dsb(struct tpdm_drvdata 
>> *drvdata)
>>       set_dsb_tier(drvdata, &val);
>>       writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
>>   +    set_dsb_msr(drvdata);
>> +
>>       val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
>>       /* Set the test accurate mode */
>>       set_dsb_test_mode(drvdata, &val);
>> @@ -234,6 +248,14 @@ static int tpdm_datasets_setup(struct 
>> tpdm_drvdata *drvdata)
>>               if (!drvdata->dsb)
>>                   return -ENOMEM;
>>           }
>> +        if (!of_property_read_u32(drvdata->dev->of_node,
>> +               "qcom,dsb_msr_num", &drvdata->dsb->msr_num)) {
>> +            drvdata->dsb->msr = devm_kzalloc(drvdata->dev, > + 
>> (drvdata->dsb->msr_num * sizeof(*drvdata->dsb->msr)),
>
>             devm_kcalloc() ?
Sure, I will update this in the next patch series.
>
>> +                   GFP_KERNEL);
>> +            if (!drvdata->dsb->msr)
>> +                return -ENOMEM;
>> +        }
>>       }
>>         return 0;
>> @@ -830,6 +852,80 @@ static ssize_t dsb_trig_ts_store(struct device 
>> *dev,
>>   }
>>   static DEVICE_ATTR_RW(dsb_trig_ts);
>>   +static ssize_t dsb_msr_idx_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->msr_idx);
>> +
>> +}
>> +
>> +static ssize_t dsb_msr_idx_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 index;
>> +
>> +    if (kstrtoul(buf, 0, &index))
>> +        return -EINVAL;
>> +    if (index >= drvdata->dsb->msr_num)
>> +        return -EPERM;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    drvdata->dsb->msr_idx = index;
>> +    spin_unlock(&drvdata->spinlock);
>> +    return size;
>> +}
>> +static DEVICE_ATTR_RW(dsb_msr_idx);
>> +
>> +static ssize_t dsb_msr_show(struct device *dev,
>> +                 struct device_attribute *attr,
>> +                 char *buf)
>> +{
>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +    unsigned int i;
>> +    unsigned long bytes;
>> +    ssize_t size = 0;
>> +
>> +    if (drvdata->dsb->msr_num == 0)
>> +        return -EINVAL;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    for (i = 0; i < drvdata->dsb->msr_num; i++) {
>> +        bytes = sysfs_emit_at(buf, size,
>> +                  "0x%x\n", drvdata->dsb->msr[i]);
>
> Single value per single file.

Sure, I will update this in the next patch series.


Best,

Tao

>
> Suzuki
>
>
>> +        if (bytes <= 0)
>> +            break;
>> +        size += bytes;
>> +    }
>> +    spin_unlock(&drvdata->spinlock);
>> +
>> +    return size;
>> +}
>> +
>> +static ssize_t dsb_msr_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))
>> +        return -EINVAL;
>> +
>> +    spin_lock(&drvdata->spinlock);
>> +    drvdata->dsb->msr[drvdata->dsb->msr_idx] = val;
>> +    spin_unlock(&drvdata->spinlock);
>> +    return size;
>> +}
>> +static DEVICE_ATTR_RW(dsb_msr);
>> +
>>   static struct attribute *tpdm_dsb_attrs[] = {
>>       &dev_attr_dsb_mode.attr,
>>       &dev_attr_dsb_edge_ctrl_idx.attr,
>> @@ -845,6 +941,8 @@ static struct attribute *tpdm_dsb_attrs[] = {
>>       &dev_attr_dsb_trig_patt_mask.attr,
>>       &dev_attr_dsb_trig_ts.attr,
>>       &dev_attr_dsb_trig_type.attr,
>> +    &dev_attr_dsb_msr_idx.attr,
>> +    &dev_attr_dsb_msr.attr,
>>       NULL,
>>   };
>>   diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h 
>> b/drivers/hwtracing/coresight/coresight-tpdm.h
>> index 7c52cf4..7b70db3 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
>> @@ -18,6 +18,7 @@
>>   #define TPDM_DSB_XPMR(n)    (0x7E8 + (n * 4))
>>   #define TPDM_DSB_EDCR(n)    (0x808 + (n * 4))
>>   #define TPDM_DSB_EDCMR(n)    (0x848 + (n * 4))
>> +#define TPDM_DSB_MSR(n)        (0x980 + (n * 4))
>>     /* Enable bit for DSB subunit */
>>   #define TPDM_DSB_CR_ENA        BIT(0)
>> @@ -100,6 +101,9 @@
>>    * @patt_mask:          Save value for pattern mask
>>    * @trig_patt:          Save value for trigger pattern
>>    * @trig_patt_mask:     Save value for trigger pattern mask
>> + * @msr_num             Number of MSR supported by DSB TPDM
>> + * @msr_idx             Index number of the MSR
>> + * @msr                 Save value for MSR
>>    * @patt_ts:            Enable/Disable pattern timestamp
>>    * @patt_type:          Set pattern type
>>    * @trig_ts:            Enable/Disable trigger timestamp.
>> @@ -116,6 +120,9 @@ struct dsb_dataset {
>>       u32                patt_mask[TPDM_DSB_MAX_PATT];
>>       u32                trig_patt[TPDM_DSB_MAX_PATT];
>>       u32                trig_patt_mask[TPDM_DSB_MAX_PATT];
>> +    u32                msr_num;
>> +    u32                msr_idx;
>> +    u32                *msr;
>>       bool            patt_ts;
>>       bool            patt_type;
>>       bool            trig_ts;
>

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Re: [PATCH v7 13/13] coresight-tpdm: Add nodes for dsb msr support

[Suzuki K Poulose]

On 18/08/2023 16:44, Tao Zhang wrote:
> 
> On 8/7/2023 7:35 PM, Suzuki K Poulose wrote:
>> On 25/07/2023 08:15, Tao Zhang wrote:
>>> Add the nodes for DSB subunit MSR(mux select register) support.
>>> The TPDM MSR (mux select register) interface is an optional
>>> interface and associated bank of registers per TPDM subunit.
>>> The intent of mux select registers is to control muxing structures
>>> driving the TPDM’s’ various subunit interfaces.
>>>
>>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>>> ---
>>>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   | 19 ++++-
>>>   drivers/hwtracing/coresight/coresight-tpdm.c       | 98 
>>> ++++++++++++++++++++++
>>>   drivers/hwtracing/coresight/coresight-tpdm.h       |  7 ++
>>>   3 files changed, 123 insertions(+), 1 deletion(-)
>>>
>>> diff --git 
>>> a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm 
>>> b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>>> index 74a0126..ee41a14 100644
>>> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>>> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>>> @@ -185,4 +185,21 @@ Description:
>>>             Accepts only one of the 2 values -  0 or 1.
>>>           0 : Set the DSB pattern type to value.
>>> -        1 : Set the DSB pattern type to toggle.
>>> \ No newline at end of file
>>> +        1 : Set the DSB pattern type to toggle.
>>> +
>>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_msr_idx
>>> +Date:        March 2023
>>> +KernelVersion    6.5
>>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang 
>>> (QUIC) <quic_taozha@quicinc.com>
>>> +Description:
>>> +        Read/Write the index number of MSR(mux select register) on DSB
>>> +        TPDM. This index number should not be greater than the number
>>> +        of MSR supported by this DSB TPDM.
>>
>> How does a user find it ? Why don't we expose it ? Scratch all of 
>> that, you could create a register file per exising msr.
>>
>>     dsb_msrs/msr0 ... msrN
>>
>> You may :
>>
>> 1. either dynamically add files as you find the number
>>
>> OR
>>
>> 2. If there is a hard limit, create that many files and control 
>> visibility based on the dynamic number.
>>
> Hi Suzuki,
> 
> 
> With regards to your suggestions, would you mind if you provide some 
> sample code for my reference?
> 
> 1. How to dynamically add files to the sysfs as I find the number?
> 
> 2. The hard limit of MSR should be 32. How can I control visibility 
> based on the dynamic number?

You could add attributes via dev_ext_attribute, storing the "idx" as
the data field for 0-31. And use the is_visible() hook for  the
attribute_group, just like you do for DSB related checks.


Some skeleton code, untested :

static ssize_t dsb_msr_read(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	struct dev_ext_attribute *eattr = container_of(attr,
				struct  dev_ext_attribute, attr);
	int idx = (int)(unsigned long)eattr->var;

	/* Read the MSR at IDX */
}

/* Similarly for dsb_msr_write() */

#define DSB_MSR_ATTR(idx)				\
	&((struct dev_ext_attribute[]) {		\
          {						\	
		 __ATTR("msr"#idx, <RW>, dsb_msr_read, dsb_msr_write), \
		 (void *)idx }        \
         })[0].attr.attr

#define DSB_MSR_ATTRS			\
	DSB_MSR_ATTR(0),			\
	DSB_MSR_ATTR(1),			\
	...
	DSB_MSR_ATTR(31)

static struct attribute * dsb_msr_attrs[] = {
	DSB_MSR_ATTRS,
	NULL,
};

static umode_t
dsb_msr_is_visible(struct kobject *kobj,
		   struct attribute *attr, int unuse)
{
	struct device *dev = kobject_to_dev(kobj);
	/* From dev, get drvdata */
	/* Then decide if it should be made visible, if yes R/W permissions */
}

static const struct attribute_group dsb_msr_group = {
         .is_visible = dsb_msr_is_visible,
         .attrs = dsb_msr_attrs,
         .name = "dsb_msr",
};

See : drivers/.../coresight-etm4x-sysfs.c:

coresight_etmv4_mgmt_attrs & coresight_etmv4_mgmt_group
for an example.

Suzuki



> 




>>
>>
>>> +
>>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_msr
>>> +Date:        March 2023
>>> +KernelVersion    6.5
>>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang 
>>> (QUIC) <quic_taozha@quicinc.com>
>>> +Description:
>>> +        (Write) Set the MSR(mux select register) of DSB tpdm. Read
>>> +        the MSR(mux select register) of DSB tpdm.
>>
>> (RW)
> Sure, I will update this in the next patch series.
>>
>>> \ No newline at end of file
>>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c 
>>> b/drivers/hwtracing/coresight/coresight-tpdm.c
>>> index f9e5a1d..be7776b 100644
>>> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
>>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
>>> @@ -90,6 +90,18 @@ static void set_dsb_tier(struct tpdm_drvdata 
>>> *drvdata, u32 *val)
>>>     }
>>>   +static void set_dsb_msr(struct tpdm_drvdata *drvdata)
>>> +{
>>> +    int i;
>>> +
>>
>>
>>> +    if (drvdata->dsb->msr_num == 0)
>>> +        return;
>>> +
>>> +    for (i = 0; i < drvdata->dsb->msr_num; i++)
>>> +        writel_relaxed(drvdata->dsb->msr[i],
>>> +               drvdata->base + TPDM_DSB_MSR(i));
>>> +}
>>> +
>>>   static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>>>   {
>>>       u32 val, i;
>>> @@ -116,6 +128,8 @@ static void tpdm_enable_dsb(struct tpdm_drvdata 
>>> *drvdata)
>>>       set_dsb_tier(drvdata, &val);
>>>       writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
>>>   +    set_dsb_msr(drvdata);
>>> +
>>>       val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
>>>       /* Set the test accurate mode */
>>>       set_dsb_test_mode(drvdata, &val);
>>> @@ -234,6 +248,14 @@ static int tpdm_datasets_setup(struct 
>>> tpdm_drvdata *drvdata)
>>>               if (!drvdata->dsb)
>>>                   return -ENOMEM;
>>>           }
>>> +        if (!of_property_read_u32(drvdata->dev->of_node,
>>> +               "qcom,dsb_msr_num", &drvdata->dsb->msr_num)) {
>>> +            drvdata->dsb->msr = devm_kzalloc(drvdata->dev, > + 
>>> (drvdata->dsb->msr_num * sizeof(*drvdata->dsb->msr)),
>>
>>             devm_kcalloc() ?
> Sure, I will update this in the next patch series.
>>
>>> +                   GFP_KERNEL);
>>> +            if (!drvdata->dsb->msr)
>>> +                return -ENOMEM;
>>> +        }
>>>       }
>>>         return 0;
>>> @@ -830,6 +852,80 @@ static ssize_t dsb_trig_ts_store(struct device 
>>> *dev,
>>>   }
>>>   static DEVICE_ATTR_RW(dsb_trig_ts);
>>>   +static ssize_t dsb_msr_idx_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->msr_idx);
>>> +
>>> +}
>>> +
>>> +static ssize_t dsb_msr_idx_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 index;
>>> +
>>> +    if (kstrtoul(buf, 0, &index))
>>> +        return -EINVAL;
>>> +    if (index >= drvdata->dsb->msr_num)
>>> +        return -EPERM;
>>> +
>>> +    spin_lock(&drvdata->spinlock);
>>> +    drvdata->dsb->msr_idx = index;
>>> +    spin_unlock(&drvdata->spinlock);
>>> +    return size;
>>> +}
>>> +static DEVICE_ATTR_RW(dsb_msr_idx);
>>> +
>>> +static ssize_t dsb_msr_show(struct device *dev,
>>> +                 struct device_attribute *attr,
>>> +                 char *buf)
>>> +{
>>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>>> +    unsigned int i;
>>> +    unsigned long bytes;
>>> +    ssize_t size = 0;
>>> +
>>> +    if (drvdata->dsb->msr_num == 0)
>>> +        return -EINVAL;
>>> +
>>> +    spin_lock(&drvdata->spinlock);
>>> +    for (i = 0; i < drvdata->dsb->msr_num; i++) {
>>> +        bytes = sysfs_emit_at(buf, size,
>>> +                  "0x%x\n", drvdata->dsb->msr[i]);
>>
>> Single value per single file.
> 
> Sure, I will update this in the next patch series.
> 
> 
> Best,
> 
> Tao
> 
>>
>> Suzuki
>>
>>
>>> +        if (bytes <= 0)
>>> +            break;
>>> +        size += bytes;
>>> +    }
>>> +    spin_unlock(&drvdata->spinlock);
>>> +
>>> +    return size;
>>> +}
>>> +
>>> +static ssize_t dsb_msr_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))
>>> +        return -EINVAL;
>>> +
>>> +    spin_lock(&drvdata->spinlock);
>>> +    drvdata->dsb->msr[drvdata->dsb->msr_idx] = val;
>>> +    spin_unlock(&drvdata->spinlock);
>>> +    return size;
>>> +}
>>> +static DEVICE_ATTR_RW(dsb_msr);
>>> +
>>>   static struct attribute *tpdm_dsb_attrs[] = {
>>>       &dev_attr_dsb_mode.attr,
>>>       &dev_attr_dsb_edge_ctrl_idx.attr,
>>> @@ -845,6 +941,8 @@ static struct attribute *tpdm_dsb_attrs[] = {
>>>       &dev_attr_dsb_trig_patt_mask.attr,
>>>       &dev_attr_dsb_trig_ts.attr,
>>>       &dev_attr_dsb_trig_type.attr,
>>> +    &dev_attr_dsb_msr_idx.attr,
>>> +    &dev_attr_dsb_msr.attr,
>>>       NULL,
>>>   };
>>>   diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h 
>>> b/drivers/hwtracing/coresight/coresight-tpdm.h
>>> index 7c52cf4..7b70db3 100644
>>> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
>>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
>>> @@ -18,6 +18,7 @@
>>>   #define TPDM_DSB_XPMR(n)    (0x7E8 + (n * 4))
>>>   #define TPDM_DSB_EDCR(n)    (0x808 + (n * 4))
>>>   #define TPDM_DSB_EDCMR(n)    (0x848 + (n * 4))
>>> +#define TPDM_DSB_MSR(n)        (0x980 + (n * 4))
>>>     /* Enable bit for DSB subunit */
>>>   #define TPDM_DSB_CR_ENA        BIT(0)
>>> @@ -100,6 +101,9 @@
>>>    * @patt_mask:          Save value for pattern mask
>>>    * @trig_patt:          Save value for trigger pattern
>>>    * @trig_patt_mask:     Save value for trigger pattern mask
>>> + * @msr_num             Number of MSR supported by DSB TPDM
>>> + * @msr_idx             Index number of the MSR
>>> + * @msr                 Save value for MSR
>>>    * @patt_ts:            Enable/Disable pattern timestamp
>>>    * @patt_type:          Set pattern type
>>>    * @trig_ts:            Enable/Disable trigger timestamp.
>>> @@ -116,6 +120,9 @@ struct dsb_dataset {
>>>       u32                patt_mask[TPDM_DSB_MAX_PATT];
>>>       u32                trig_patt[TPDM_DSB_MAX_PATT];
>>>       u32                trig_patt_mask[TPDM_DSB_MAX_PATT];
>>> +    u32                msr_num;
>>> +    u32                msr_idx;
>>> +    u32                *msr;
>>>       bool            patt_ts;
>>>       bool            patt_type;
>>>       bool            trig_ts;
>>


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Re: [PATCH v7 13/13] coresight-tpdm: Add nodes for dsb msr support

[Tao Zhang]

On 8/19/2023 12:25 AM, Suzuki K Poulose wrote:
> On 18/08/2023 16:44, Tao Zhang wrote:
>>
>> On 8/7/2023 7:35 PM, Suzuki K Poulose wrote:
>>> On 25/07/2023 08:15, Tao Zhang wrote:
>>>> Add the nodes for DSB subunit MSR(mux select register) support.
>>>> The TPDM MSR (mux select register) interface is an optional
>>>> interface and associated bank of registers per TPDM subunit.
>>>> The intent of mux select registers is to control muxing structures
>>>> driving the TPDM’s’ various subunit interfaces.
>>>>
>>>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>>>> ---
>>>>   .../ABI/testing/sysfs-bus-coresight-devices-tpdm   | 19 ++++-
>>>>   drivers/hwtracing/coresight/coresight-tpdm.c       | 98 
>>>> ++++++++++++++++++++++
>>>>   drivers/hwtracing/coresight/coresight-tpdm.h       |  7 ++
>>>>   3 files changed, 123 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git 
>>>> a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm 
>>>> b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>>>> index 74a0126..ee41a14 100644
>>>> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>>>> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>>>> @@ -185,4 +185,21 @@ Description:
>>>>             Accepts only one of the 2 values -  0 or 1.
>>>>           0 : Set the DSB pattern type to value.
>>>> -        1 : Set the DSB pattern type to toggle.
>>>> \ No newline at end of file
>>>> +        1 : Set the DSB pattern type to toggle.
>>>> +
>>>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_msr_idx
>>>> +Date:        March 2023
>>>> +KernelVersion    6.5
>>>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao 
>>>> Zhang (QUIC) <quic_taozha@quicinc.com>
>>>> +Description:
>>>> +        Read/Write the index number of MSR(mux select register) on 
>>>> DSB
>>>> +        TPDM. This index number should not be greater than the number
>>>> +        of MSR supported by this DSB TPDM.
>>>
>>> How does a user find it ? Why don't we expose it ? Scratch all of 
>>> that, you could create a register file per exising msr.
>>>
>>>     dsb_msrs/msr0 ... msrN
>>>
>>> You may :
>>>
>>> 1. either dynamically add files as you find the number
>>>
>>> OR
>>>
>>> 2. If there is a hard limit, create that many files and control 
>>> visibility based on the dynamic number.
>>>
>> Hi Suzuki,
>>
>>
>> With regards to your suggestions, would you mind if you provide some 
>> sample code for my reference?
>>
>> 1. How to dynamically add files to the sysfs as I find the number?
>>
>> 2. The hard limit of MSR should be 32. How can I control visibility 
>> based on the dynamic number?
>
> You could add attributes via dev_ext_attribute, storing the "idx" as
> the data field for 0-31. And use the is_visible() hook for  the
> attribute_group, just like you do for DSB related checks.
>
>
> Some skeleton code, untested :
>
> static ssize_t dsb_msr_read(struct device *dev,
>                 struct device_attribute *attr, char *buf)
> {
>     struct dev_ext_attribute *eattr = container_of(attr,
>                 struct  dev_ext_attribute, attr);
>     int idx = (int)(unsigned long)eattr->var;
>
>     /* Read the MSR at IDX */
> }
>
> /* Similarly for dsb_msr_write() */
>
> #define DSB_MSR_ATTR(idx)                \
>     &((struct dev_ext_attribute[]) {        \
>          {                        \
>          __ATTR("msr"#idx, <RW>, dsb_msr_read, dsb_msr_write), \
>          (void *)idx }        \
>         })[0].attr.attr
>
> #define DSB_MSR_ATTRS            \
>     DSB_MSR_ATTR(0),            \
>     DSB_MSR_ATTR(1),            \
>     ...
>     DSB_MSR_ATTR(31)
>
> static struct attribute * dsb_msr_attrs[] = {
>     DSB_MSR_ATTRS,
>     NULL,
> };
>
> static umode_t
> dsb_msr_is_visible(struct kobject *kobj,
>            struct attribute *attr, int unuse)
> {
>     struct device *dev = kobject_to_dev(kobj);
>     /* From dev, get drvdata */
>     /* Then decide if it should be made visible, if yes R/W 
> permissions */
> }
>
> static const struct attribute_group dsb_msr_group = {
>         .is_visible = dsb_msr_is_visible,
>         .attrs = dsb_msr_attrs,
>         .name = "dsb_msr",
> };
>
> See : drivers/.../coresight-etm4x-sysfs.c:
>
> coresight_etmv4_mgmt_attrs & coresight_etmv4_mgmt_group
> for an example.
>
> Suzuki
>
I only can control if we need to expose the MSR sysfs files, but cannot 
control how

much MSR sysfs files need to be exposed dynamically, right?


Best,

Tao

>
>
>>
>
>
>
>
>>>
>>>
>>>> +
>>>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_msr
>>>> +Date:        March 2023
>>>> +KernelVersion    6.5
>>>> +Contact:    Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao 
>>>> Zhang (QUIC) <quic_taozha@quicinc.com>
>>>> +Description:
>>>> +        (Write) Set the MSR(mux select register) of DSB tpdm. Read
>>>> +        the MSR(mux select register) of DSB tpdm.
>>>
>>> (RW)
>> Sure, I will update this in the next patch series.
>>>
>>>> \ No newline at end of file
>>>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c 
>>>> b/drivers/hwtracing/coresight/coresight-tpdm.c
>>>> index f9e5a1d..be7776b 100644
>>>> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
>>>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
>>>> @@ -90,6 +90,18 @@ static void set_dsb_tier(struct tpdm_drvdata 
>>>> *drvdata, u32 *val)
>>>>     }
>>>>   +static void set_dsb_msr(struct tpdm_drvdata *drvdata)
>>>> +{
>>>> +    int i;
>>>> +
>>>
>>>
>>>> +    if (drvdata->dsb->msr_num == 0)
>>>> +        return;
>>>> +
>>>> +    for (i = 0; i < drvdata->dsb->msr_num; i++)
>>>> +        writel_relaxed(drvdata->dsb->msr[i],
>>>> +               drvdata->base + TPDM_DSB_MSR(i));
>>>> +}
>>>> +
>>>>   static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>>>>   {
>>>>       u32 val, i;
>>>> @@ -116,6 +128,8 @@ static void tpdm_enable_dsb(struct tpdm_drvdata 
>>>> *drvdata)
>>>>       set_dsb_tier(drvdata, &val);
>>>>       writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
>>>>   +    set_dsb_msr(drvdata);
>>>> +
>>>>       val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
>>>>       /* Set the test accurate mode */
>>>>       set_dsb_test_mode(drvdata, &val);
>>>> @@ -234,6 +248,14 @@ static int tpdm_datasets_setup(struct 
>>>> tpdm_drvdata *drvdata)
>>>>               if (!drvdata->dsb)
>>>>                   return -ENOMEM;
>>>>           }
>>>> +        if (!of_property_read_u32(drvdata->dev->of_node,
>>>> +               "qcom,dsb_msr_num", &drvdata->dsb->msr_num)) {
>>>> +            drvdata->dsb->msr = devm_kzalloc(drvdata->dev, > + 
>>>> (drvdata->dsb->msr_num * sizeof(*drvdata->dsb->msr)),
>>>
>>>             devm_kcalloc() ?
>> Sure, I will update this in the next patch series.
>>>
>>>> +                   GFP_KERNEL);
>>>> +            if (!drvdata->dsb->msr)
>>>> +                return -ENOMEM;
>>>> +        }
>>>>       }
>>>>         return 0;
>>>> @@ -830,6 +852,80 @@ static ssize_t dsb_trig_ts_store(struct device 
>>>> *dev,
>>>>   }
>>>>   static DEVICE_ATTR_RW(dsb_trig_ts);
>>>>   +static ssize_t dsb_msr_idx_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->msr_idx);
>>>> +
>>>> +}
>>>> +
>>>> +static ssize_t dsb_msr_idx_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 index;
>>>> +
>>>> +    if (kstrtoul(buf, 0, &index))
>>>> +        return -EINVAL;
>>>> +    if (index >= drvdata->dsb->msr_num)
>>>> +        return -EPERM;
>>>> +
>>>> +    spin_lock(&drvdata->spinlock);
>>>> +    drvdata->dsb->msr_idx = index;
>>>> +    spin_unlock(&drvdata->spinlock);
>>>> +    return size;
>>>> +}
>>>> +static DEVICE_ATTR_RW(dsb_msr_idx);
>>>> +
>>>> +static ssize_t dsb_msr_show(struct device *dev,
>>>> +                 struct device_attribute *attr,
>>>> +                 char *buf)
>>>> +{
>>>> +    struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>>>> +    unsigned int i;
>>>> +    unsigned long bytes;
>>>> +    ssize_t size = 0;
>>>> +
>>>> +    if (drvdata->dsb->msr_num == 0)
>>>> +        return -EINVAL;
>>>> +
>>>> +    spin_lock(&drvdata->spinlock);
>>>> +    for (i = 0; i < drvdata->dsb->msr_num; i++) {
>>>> +        bytes = sysfs_emit_at(buf, size,
>>>> +                  "0x%x\n", drvdata->dsb->msr[i]);
>>>
>>> Single value per single file.
>>
>> Sure, I will update this in the next patch series.
>>
>>
>> Best,
>>
>> Tao
>>
>>>
>>> Suzuki
>>>
>>>
>>>> +        if (bytes <= 0)
>>>> +            break;
>>>> +        size += bytes;
>>>> +    }
>>>> +    spin_unlock(&drvdata->spinlock);
>>>> +
>>>> +    return size;
>>>> +}
>>>> +
>>>> +static ssize_t dsb_msr_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))
>>>> +        return -EINVAL;
>>>> +
>>>> +    spin_lock(&drvdata->spinlock);
>>>> +    drvdata->dsb->msr[drvdata->dsb->msr_idx] = val;
>>>> +    spin_unlock(&drvdata->spinlock);
>>>> +    return size;
>>>> +}
>>>> +static DEVICE_ATTR_RW(dsb_msr);
>>>> +
>>>>   static struct attribute *tpdm_dsb_attrs[] = {
>>>>       &dev_attr_dsb_mode.attr,
>>>>       &dev_attr_dsb_edge_ctrl_idx.attr,
>>>> @@ -845,6 +941,8 @@ static struct attribute *tpdm_dsb_attrs[] = {
>>>>       &dev_attr_dsb_trig_patt_mask.attr,
>>>>       &dev_attr_dsb_trig_ts.attr,
>>>>       &dev_attr_dsb_trig_type.attr,
>>>> +    &dev_attr_dsb_msr_idx.attr,
>>>> +    &dev_attr_dsb_msr.attr,
>>>>       NULL,
>>>>   };
>>>>   diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h 
>>>> b/drivers/hwtracing/coresight/coresight-tpdm.h
>>>> index 7c52cf4..7b70db3 100644
>>>> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
>>>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
>>>> @@ -18,6 +18,7 @@
>>>>   #define TPDM_DSB_XPMR(n)    (0x7E8 + (n * 4))
>>>>   #define TPDM_DSB_EDCR(n)    (0x808 + (n * 4))
>>>>   #define TPDM_DSB_EDCMR(n)    (0x848 + (n * 4))
>>>> +#define TPDM_DSB_MSR(n)        (0x980 + (n * 4))
>>>>     /* Enable bit for DSB subunit */
>>>>   #define TPDM_DSB_CR_ENA        BIT(0)
>>>> @@ -100,6 +101,9 @@
>>>>    * @patt_mask:          Save value for pattern mask
>>>>    * @trig_patt:          Save value for trigger pattern
>>>>    * @trig_patt_mask:     Save value for trigger pattern mask
>>>> + * @msr_num             Number of MSR supported by DSB TPDM
>>>> + * @msr_idx             Index number of the MSR
>>>> + * @msr                 Save value for MSR
>>>>    * @patt_ts:            Enable/Disable pattern timestamp
>>>>    * @patt_type:          Set pattern type
>>>>    * @trig_ts:            Enable/Disable trigger timestamp.
>>>> @@ -116,6 +120,9 @@ struct dsb_dataset {
>>>>       u32                patt_mask[TPDM_DSB_MAX_PATT];
>>>>       u32                trig_patt[TPDM_DSB_MAX_PATT];
>>>>       u32                trig_patt_mask[TPDM_DSB_MAX_PATT];
>>>> +    u32                msr_num;
>>>> +    u32                msr_idx;
>>>> +    u32                *msr;
>>>>       bool            patt_ts;
>>>>       bool            patt_type;
>>>>       bool            trig_ts;
>>>
>

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