diff mbox series

[v3,2/8] coresight-tpda: Add support to configure CMB element

Message ID 1700533494-19276-3-git-send-email-quic_taozha@quicinc.com (mailing list archive)
State Not Applicable
Headers show
Series [v3,1/8] dt-bindings: arm: Add support for CMB element size | expand

Commit Message

Tao Zhang Nov. 21, 2023, 2:24 a.m. UTC
Read the CMB element size from the device tree. Set the register
bit that controls the CMB element size of the corresponding port.

Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
---
 drivers/hwtracing/coresight/coresight-tpda.c | 117 +++++++++++--------
 drivers/hwtracing/coresight/coresight-tpda.h |   6 +
 2 files changed, 74 insertions(+), 49 deletions(-)

Comments

James Clark Dec. 15, 2023, 11:20 a.m. UTC | #1
On 21/11/2023 02:24, Tao Zhang wrote:
> Read the CMB element size from the device tree. Set the register
> bit that controls the CMB element size of the corresponding port.
> 
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>

Reviewed-by: James Clark <james.clark@arm.com>

> ---
>  drivers/hwtracing/coresight/coresight-tpda.c | 117 +++++++++++--------
>  drivers/hwtracing/coresight/coresight-tpda.h |   6 +
>  2 files changed, 74 insertions(+), 49 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
> index 5f82737c37bb..e3762f38abb3 100644
> --- a/drivers/hwtracing/coresight/coresight-tpda.c
> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
> @@ -28,24 +28,54 @@ static bool coresight_device_is_tpdm(struct coresight_device *csdev)
>  			CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
>  }
>  
> +static void tpdm_clear_element_size(struct coresight_device *csdev)
> +{
> +	struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> +
> +	if (drvdata->dsb_esize)
> +		drvdata->dsb_esize = 0;
> +	if (drvdata->cmb_esize)
> +		drvdata->cmb_esize = 0;
> +}
> +
> +static void tpda_set_element_size(struct tpda_drvdata *drvdata, u32 *val)
> +{
> +
> +	if (drvdata->dsb_esize == 64)
> +		*val |= TPDA_Pn_CR_DSBSIZE;
> +	else if (drvdata->dsb_esize == 32)
> +		*val &= ~TPDA_Pn_CR_DSBSIZE;
> +
> +	if (drvdata->cmb_esize == 64)
> +		*val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x2);
> +	else if (drvdata->cmb_esize == 32)
> +		*val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x1);
> +	else if (drvdata->cmb_esize == 8)
> +		*val &= ~TPDA_Pn_CR_CMBSIZE;
> +}
> +
>  /*
> - * Read the DSB element size from the TPDM device
> + * Read the element size from the TPDM device
>   * Returns
> - *    The dsb element size read from the devicetree if available.
> + *    The element size read from the devicetree if available.
>   *    0 - Otherwise, with a warning once.
>   */
> -static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
> +static int tpdm_read_element_size(struct tpda_drvdata *drvdata,
> +				  struct coresight_device *csdev)
>  {
> -	int rc = 0;
> -	u8 size = 0;
> -
> -	rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
> -			"qcom,dsb-element-size", &size);
> +	int rc = -EINVAL;
> +
> +	if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
> +			"qcom,dsb-element-size", &drvdata->dsb_esize))
> +		rc = 0;
> +	if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
> +			"qcom,cmb-element-size", &drvdata->cmb_esize))
> +		rc = 0;
>  	if (rc)
>  		dev_warn_once(&csdev->dev,
> -			"Failed to read TPDM DSB Element size: %d\n", rc);
> +			"Failed to read TPDM Element size: %d\n", rc);
>  
> -	return size;
> +	return rc;
>  }
>  
>  /*
> @@ -56,11 +86,12 @@ static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
>   * Parameter "inport" is used to pass in the input port number
>   * of TPDA, and it is set to -1 in the recursize call.
>   */
> -static int tpda_get_element_size(struct coresight_device *csdev,
> +static int tpda_get_element_size(struct tpda_drvdata *drvdata,
> +				 struct coresight_device *csdev,
>  				 int inport)
>  {
> -	int dsb_size = -ENOENT;
> -	int i, size;
> +	int rc = 0;
> +	int i;
>  	struct coresight_device *in;
>  
>  	for (i = 0; i < csdev->pdata->nr_inconns; i++) {
> @@ -74,25 +105,21 @@ static int tpda_get_element_size(struct coresight_device *csdev,
>  			continue;
>  
>  		if (coresight_device_is_tpdm(in)) {
> -			size = tpdm_read_dsb_element_size(in);
> +			if ((drvdata->dsb_esize) || (drvdata->cmb_esize))
> +				return -EEXIST;
> +			rc = tpdm_read_element_size(drvdata, in);
> +			if (rc)
> +				return rc;
>  		} else {
>  			/* Recurse down the path */
> -			size = tpda_get_element_size(in, -1);
> -		}
> -
> -		if (size < 0)
> -			return size;
> -
> -		if (dsb_size < 0) {
> -			/* Found a size, save it. */
> -			dsb_size = size;
> -		} else {
> -			/* Found duplicate TPDMs */
> -			return -EEXIST;
> +			rc = tpda_get_element_size(drvdata, in, -1);
> +			if (rc)
> +				return rc;
>  		}
>  	}
>  
> -	return dsb_size;
> +
> +	return rc;
>  }
>  
>  /* Settings pre enabling port control register */
> @@ -109,7 +136,7 @@ static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
>  static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>  {
>  	u32 val;
> -	int size;
> +	int rc;
>  
>  	val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
>  	/*
> @@ -117,29 +144,21 @@ static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>  	 * Set the bit to 0 if the size is 32
>  	 * Set the bit to 1 if the size is 64
>  	 */
> -	size = tpda_get_element_size(drvdata->csdev, port);
> -	switch (size) {
> -	case 32:
> -		val &= ~TPDA_Pn_CR_DSBSIZE;
> -		break;
> -	case 64:
> -		val |= TPDA_Pn_CR_DSBSIZE;
> -		break;
> -	case 0:
> -		return -EEXIST;
> -	case -EEXIST:
> +	tpdm_clear_element_size(drvdata->csdev);
> +	rc = tpda_get_element_size(drvdata, drvdata->csdev, port);
> +	if (!rc && ((drvdata->dsb_esize) || (drvdata->cmb_esize))) {
> +		tpda_set_element_size(drvdata, &val);
> +		/* Enable the port */
> +		val |= TPDA_Pn_CR_ENA;
> +		writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
> +	} else if (rc == -EEXIST)
>  		dev_warn_once(&drvdata->csdev->dev,
> -			"Detected multiple TPDMs on port %d", -EEXIST);
> -		return -EEXIST;
> -	default:
> -		return -EINVAL;
> -	}
> -
> -	/* Enable the port */
> -	val |= TPDA_Pn_CR_ENA;
> -	writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
> +			      "Detected multiple TPDMs on port %d", -EEXIST);
> +	else
> +		dev_warn_once(&drvdata->csdev->dev,
> +			      "Didn't find TPDM elem size");
>  
> -	return 0;
> +	return rc;
>  }
>  
>  static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h
> index b3b38fd41b64..29164fd9711f 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 CMB data set element size bit */
> +#define TPDA_Pn_CR_CMBSIZE		GENMASK(7, 6)
>  /* Aggregator port DSB data set element size bit */
>  #define TPDA_Pn_CR_DSBSIZE		BIT(8)
>  
> @@ -25,6 +27,8 @@
>   * @csdev:      component vitals needed by the framework.
>   * @spinlock:   lock for the drvdata value.
>   * @enable:     enable status of the component.
> + * @dsb_esize   Record the DSB element size.
> + * @cmb_esize   Record the CMB element size.
>   */
>  struct tpda_drvdata {
>  	void __iomem		*base;
> @@ -32,6 +36,8 @@ struct tpda_drvdata {
>  	struct coresight_device	*csdev;
>  	spinlock_t		spinlock;
>  	u8			atid;
> +	u8			dsb_esize;
> +	u8			cmb_esize;
>  };
>  
>  #endif  /* _CORESIGHT_CORESIGHT_TPDA_H */
Suzuki K Poulose Dec. 18, 2023, 10:27 a.m. UTC | #2
On 21/11/2023 02:24, Tao Zhang wrote:
> Read the CMB element size from the device tree. Set the register
> bit that controls the CMB element size of the corresponding port.
> 
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
> ---
>   drivers/hwtracing/coresight/coresight-tpda.c | 117 +++++++++++--------
>   drivers/hwtracing/coresight/coresight-tpda.h |   6 +
>   2 files changed, 74 insertions(+), 49 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
> index 5f82737c37bb..e3762f38abb3 100644
> --- a/drivers/hwtracing/coresight/coresight-tpda.c
> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
> @@ -28,24 +28,54 @@ static bool coresight_device_is_tpdm(struct coresight_device *csdev)
>   			CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
>   }
>   
> +static void tpdm_clear_element_size(struct coresight_device *csdev)
> +{
> +	struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> +
> +	if (drvdata->dsb_esize)
> +		drvdata->dsb_esize = 0;
> +	if (drvdata->cmb_esize)
> +		drvdata->cmb_esize = 0;

Why do we need the if (...) check here ?

> +}
> +
> +static void tpda_set_element_size(struct tpda_drvdata *drvdata, u32 *val)
> +{
> +
> +	if (drvdata->dsb_esize == 64)
> +		*val |= TPDA_Pn_CR_DSBSIZE;
> +	else if (drvdata->dsb_esize == 32)
> +		*val &= ~TPDA_Pn_CR_DSBSIZE;
> +
> +	if (drvdata->cmb_esize == 64)
> +		*val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x2);
> +	else if (drvdata->cmb_esize == 32)
> +		*val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x1);
> +	else if (drvdata->cmb_esize == 8)
> +		*val &= ~TPDA_Pn_CR_CMBSIZE;
> +}
> +


>   /*
> - * Read the DSB element size from the TPDM device
> + * Read the element size from the TPDM device
>    * Returns
> - *    The dsb element size read from the devicetree if available.
> + *    The element size read from the devicetree if available.
>    *    0 - Otherwise, with a warning once.

This doesn't match the function ? It return 0 on success and
error (-EINVAL) on failure ?

>    */
> -static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
> +static int tpdm_read_element_size(struct tpda_drvdata *drvdata,
> +				  struct coresight_device *csdev)
>   {
> -	int rc = 0;
> -	u8 size = 0;
> -
> -	rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
> -			"qcom,dsb-element-size", &size);
> +	int rc = -EINVAL;
> +
> +	if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
> +			"qcom,dsb-element-size", &drvdata->dsb_esize))
> +		rc = 0;
> +	if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
> +			"qcom,cmb-element-size", &drvdata->cmb_esize))
> +		rc = 0;

Are we not silently resetting the error if the former failed ?

Could we not :

	rc |= fwnode_...

	rc |= fwnode_...

instead ?

Also what is the expectation here ? Are these properties a MUST for
TPDM ?

>   	if (rc)
>   		dev_warn_once(&csdev->dev,
> -			"Failed to read TPDM DSB Element size: %d\n", rc);
> +			"Failed to read TPDM Element size: %d\n", rc);
>   
> -	return size;
> +	return rc;
>   }
>   
>   /*
> @@ -56,11 +86,12 @@ static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
>    * Parameter "inport" is used to pass in the input port number
>    * of TPDA, and it is set to -1 in the recursize call.
>    */
> -static int tpda_get_element_size(struct coresight_device *csdev,
> +static int tpda_get_element_size(struct tpda_drvdata *drvdata,
> +				 struct coresight_device *csdev,
>   				 int inport)
>   {
> -	int dsb_size = -ENOENT;
> -	int i, size;
> +	int rc = 0;
> +	int i;
>   	struct coresight_device *in;
>   
>   	for (i = 0; i < csdev->pdata->nr_inconns; i++) {
> @@ -74,25 +105,21 @@ static int tpda_get_element_size(struct coresight_device *csdev,
>   			continue;
>   
>   		if (coresight_device_is_tpdm(in)) {
> -			size = tpdm_read_dsb_element_size(in);
> +			if ((drvdata->dsb_esize) || (drvdata->cmb_esize))
> +				return -EEXIST;
> +			rc = tpdm_read_element_size(drvdata, in);
> +			if (rc)
> +				return rc;
>   		} else {
>   			/* Recurse down the path */
> -			size = tpda_get_element_size(in, -1);
> -		}
> -
> -		if (size < 0)
> -			return size;
> -
> -		if (dsb_size < 0) {
> -			/* Found a size, save it. */
> -			dsb_size = size;
> -		} else {
> -			/* Found duplicate TPDMs */
> -			return -EEXIST;
> +			rc = tpda_get_element_size(drvdata, in, -1);
> +			if (rc)
> +				return rc;
>   		}
>   	}
>   
> -	return dsb_size;
> +
> +	return rc;
>   }
>   
>   /* Settings pre enabling port control register */
> @@ -109,7 +136,7 @@ static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
>   static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>   {
>   	u32 val;
> -	int size;
> +	int rc;
>   
>   	val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
>   	/*
> @@ -117,29 +144,21 @@ static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>   	 * Set the bit to 0 if the size is 32
>   	 * Set the bit to 1 if the size is 64
>   	 */
> -	size = tpda_get_element_size(drvdata->csdev, port);
> -	switch (size) {
> -	case 32:
> -		val &= ~TPDA_Pn_CR_DSBSIZE;
> -		break;
> -	case 64:
> -		val |= TPDA_Pn_CR_DSBSIZE;
> -		break;
> -	case 0:
> -		return -EEXIST;
> -	case -EEXIST:
> +	tpdm_clear_element_size(drvdata->csdev);
> +	rc = tpda_get_element_size(drvdata, drvdata->csdev, port);
> +	if (!rc && ((drvdata->dsb_esize) || (drvdata->cmb_esize))) {
> +		tpda_set_element_size(drvdata, &val);
> +		/* Enable the port */
> +		val |= TPDA_Pn_CR_ENA;
> +		writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
> +	} else if (rc == -EEXIST)
>   		dev_warn_once(&drvdata->csdev->dev,
> -			"Detected multiple TPDMs on port %d", -EEXIST);
> -		return -EEXIST;
> -	default:
> -		return -EINVAL;
> -	}
> -
> -	/* Enable the port */
> -	val |= TPDA_Pn_CR_ENA;
> -	writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
> +			      "Detected multiple TPDMs on port %d", -EEXIST);
> +	else
> +		dev_warn_once(&drvdata->csdev->dev,
> +			      "Didn't find TPDM elem size");

"element size"

>   
> -	return 0;
> +	return rc;
>   }
>   
>   static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h
> index b3b38fd41b64..29164fd9711f 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 CMB data set element size bit */
> +#define TPDA_Pn_CR_CMBSIZE		GENMASK(7, 6)
>   /* Aggregator port DSB data set element size bit */
>   #define TPDA_Pn_CR_DSBSIZE		BIT(8)
>   
> @@ -25,6 +27,8 @@
>    * @csdev:      component vitals needed by the framework.
>    * @spinlock:   lock for the drvdata value.
>    * @enable:     enable status of the component.
> + * @dsb_esize   Record the DSB element size.
> + * @cmb_esize   Record the CMB element size.
>    */
>   struct tpda_drvdata {
>   	void __iomem		*base;
> @@ -32,6 +36,8 @@ struct tpda_drvdata {
>   	struct coresight_device	*csdev;
>   	spinlock_t		spinlock;
>   	u8			atid;
> +	u8			dsb_esize;
> +	u8			cmb_esize;
>   };
>   
>   #endif  /* _CORESIGHT_CORESIGHT_TPDA_H */

Suzuki
Tao Zhang Dec. 19, 2023, 2:13 a.m. UTC | #3
On 12/18/2023 6:27 PM, Suzuki K Poulose wrote:
> On 21/11/2023 02:24, Tao Zhang wrote:
>> Read the CMB element size from the device tree. Set the register
>> bit that controls the CMB element size of the corresponding port.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>> Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-tpda.c | 117 +++++++++++--------
>>   drivers/hwtracing/coresight/coresight-tpda.h |   6 +
>>   2 files changed, 74 insertions(+), 49 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c 
>> b/drivers/hwtracing/coresight/coresight-tpda.c
>> index 5f82737c37bb..e3762f38abb3 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>> @@ -28,24 +28,54 @@ static bool coresight_device_is_tpdm(struct 
>> coresight_device *csdev)
>>               CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
>>   }
>>   +static void tpdm_clear_element_size(struct coresight_device *csdev)
>> +{
>> +    struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>> +
>> +    if (drvdata->dsb_esize)
>> +        drvdata->dsb_esize = 0;
>> +    if (drvdata->cmb_esize)
>> +        drvdata->cmb_esize = 0;
>
> Why do we need the if (...) check here ?

The element size of all the TPDM sub-unit should be set to 0 here.

I will update this in the next patch series.

>
>> +}
>> +
>> +static void tpda_set_element_size(struct tpda_drvdata *drvdata, u32 
>> *val)
>> +{
>> +
>> +    if (drvdata->dsb_esize == 64)
>> +        *val |= TPDA_Pn_CR_DSBSIZE;
>> +    else if (drvdata->dsb_esize == 32)
>> +        *val &= ~TPDA_Pn_CR_DSBSIZE;
>> +
>> +    if (drvdata->cmb_esize == 64)
>> +        *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x2);
>> +    else if (drvdata->cmb_esize == 32)
>> +        *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x1);
>> +    else if (drvdata->cmb_esize == 8)
>> +        *val &= ~TPDA_Pn_CR_CMBSIZE;
>> +}
>> +
>
>
>>   /*
>> - * Read the DSB element size from the TPDM device
>> + * Read the element size from the TPDM device
>>    * Returns
>> - *    The dsb element size read from the devicetree if available.
>> + *    The element size read from the devicetree if available.
>>    *    0 - Otherwise, with a warning once.
>
> This doesn't match the function ? It return 0 on success and
> error (-EINVAL) on failure ?

0 means the element size property is found from the devicetree.

Otherwise, it will return error(-EINVAL).

I will update this in the next patch series.

>
>>    */
>> -static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
>> +static int tpdm_read_element_size(struct tpda_drvdata *drvdata,
>> +                  struct coresight_device *csdev)
>>   {
>> -    int rc = 0;
>> -    u8 size = 0;
>> -
>> -    rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>> -            "qcom,dsb-element-size", &size);
>> +    int rc = -EINVAL;
>> +
>> +    if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>> +            "qcom,dsb-element-size", &drvdata->dsb_esize))
>> +        rc = 0;
>> +    if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>> +            "qcom,cmb-element-size", &drvdata->cmb_esize))
>> +        rc = 0;
>
> Are we not silently resetting the error if the former failed ?
>
> Could we not :
>
>     rc |= fwnode_...
>
>     rc |= fwnode_...
>
> instead ?
>
> Also what is the expectation here ? Are these properties a MUST for
> TPDM ?

The TPDM must have one of the element size property. As long as one

can be found, this TPDM configuration can be considered valid. So this

function will return 0 if one of the element size property is found.


Best,

Tao

>
>>       if (rc)
>>           dev_warn_once(&csdev->dev,
>> -            "Failed to read TPDM DSB Element size: %d\n", rc);
>> +            "Failed to read TPDM Element size: %d\n", rc);
>>   -    return size;
>> +    return rc;
>>   }
>>     /*
>> @@ -56,11 +86,12 @@ static int tpdm_read_dsb_element_size(struct 
>> coresight_device *csdev)
>>    * Parameter "inport" is used to pass in the input port number
>>    * of TPDA, and it is set to -1 in the recursize call.
>>    */
>> -static int tpda_get_element_size(struct coresight_device *csdev,
>> +static int tpda_get_element_size(struct tpda_drvdata *drvdata,
>> +                 struct coresight_device *csdev,
>>                    int inport)
>>   {
>> -    int dsb_size = -ENOENT;
>> -    int i, size;
>> +    int rc = 0;
>> +    int i;
>>       struct coresight_device *in;
>>         for (i = 0; i < csdev->pdata->nr_inconns; i++) {
>> @@ -74,25 +105,21 @@ static int tpda_get_element_size(struct 
>> coresight_device *csdev,
>>               continue;
>>             if (coresight_device_is_tpdm(in)) {
>> -            size = tpdm_read_dsb_element_size(in);
>> +            if ((drvdata->dsb_esize) || (drvdata->cmb_esize))
>> +                return -EEXIST;
>> +            rc = tpdm_read_element_size(drvdata, in);
>> +            if (rc)
>> +                return rc;
>>           } else {
>>               /* Recurse down the path */
>> -            size = tpda_get_element_size(in, -1);
>> -        }
>> -
>> -        if (size < 0)
>> -            return size;
>> -
>> -        if (dsb_size < 0) {
>> -            /* Found a size, save it. */
>> -            dsb_size = size;
>> -        } else {
>> -            /* Found duplicate TPDMs */
>> -            return -EEXIST;
>> +            rc = tpda_get_element_size(drvdata, in, -1);
>> +            if (rc)
>> +                return rc;
>>           }
>>       }
>>   -    return dsb_size;
>> +
>> +    return rc;
>>   }
>>     /* Settings pre enabling port control register */
>> @@ -109,7 +136,7 @@ static void tpda_enable_pre_port(struct 
>> tpda_drvdata *drvdata)
>>   static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>>   {
>>       u32 val;
>> -    int size;
>> +    int rc;
>>         val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
>>       /*
>> @@ -117,29 +144,21 @@ static int tpda_enable_port(struct tpda_drvdata 
>> *drvdata, int port)
>>        * Set the bit to 0 if the size is 32
>>        * Set the bit to 1 if the size is 64
>>        */
>> -    size = tpda_get_element_size(drvdata->csdev, port);
>> -    switch (size) {
>> -    case 32:
>> -        val &= ~TPDA_Pn_CR_DSBSIZE;
>> -        break;
>> -    case 64:
>> -        val |= TPDA_Pn_CR_DSBSIZE;
>> -        break;
>> -    case 0:
>> -        return -EEXIST;
>> -    case -EEXIST:
>> +    tpdm_clear_element_size(drvdata->csdev);
>> +    rc = tpda_get_element_size(drvdata, drvdata->csdev, port);
>> +    if (!rc && ((drvdata->dsb_esize) || (drvdata->cmb_esize))) {
>> +        tpda_set_element_size(drvdata, &val);
>> +        /* Enable the port */
>> +        val |= TPDA_Pn_CR_ENA;
>> +        writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>> +    } else if (rc == -EEXIST)
>>           dev_warn_once(&drvdata->csdev->dev,
>> -            "Detected multiple TPDMs on port %d", -EEXIST);
>> -        return -EEXIST;
>> -    default:
>> -        return -EINVAL;
>> -    }
>> -
>> -    /* Enable the port */
>> -    val |= TPDA_Pn_CR_ENA;
>> -    writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>> +                  "Detected multiple TPDMs on port %d", -EEXIST);
>> +    else
>> +        dev_warn_once(&drvdata->csdev->dev,
>> +                  "Didn't find TPDM elem size");
>
> "element size"
>
>>   -    return 0;
>> +    return rc;
>>   }
>>     static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h 
>> b/drivers/hwtracing/coresight/coresight-tpda.h
>> index b3b38fd41b64..29164fd9711f 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 CMB data set element size bit */
>> +#define TPDA_Pn_CR_CMBSIZE        GENMASK(7, 6)
>>   /* Aggregator port DSB data set element size bit */
>>   #define TPDA_Pn_CR_DSBSIZE        BIT(8)
>>   @@ -25,6 +27,8 @@
>>    * @csdev:      component vitals needed by the framework.
>>    * @spinlock:   lock for the drvdata value.
>>    * @enable:     enable status of the component.
>> + * @dsb_esize   Record the DSB element size.
>> + * @cmb_esize   Record the CMB element size.
>>    */
>>   struct tpda_drvdata {
>>       void __iomem        *base;
>> @@ -32,6 +36,8 @@ struct tpda_drvdata {
>>       struct coresight_device    *csdev;
>>       spinlock_t        spinlock;
>>       u8            atid;
>> +    u8            dsb_esize;
>> +    u8            cmb_esize;
>>   };
>>     #endif  /* _CORESIGHT_CORESIGHT_TPDA_H */
>
> Suzuki
>
>
Suzuki K Poulose Dec. 19, 2023, 1:54 p.m. UTC | #4
On 19/12/2023 02:13, Tao Zhang wrote:
> 
> On 12/18/2023 6:27 PM, Suzuki K Poulose wrote:
>> On 21/11/2023 02:24, Tao Zhang wrote:
>>> Read the CMB element size from the device tree. Set the register
>>> bit that controls the CMB element size of the corresponding port.
>>>
>>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>>> Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
>>> ---
>>>   drivers/hwtracing/coresight/coresight-tpda.c | 117 +++++++++++--------
>>>   drivers/hwtracing/coresight/coresight-tpda.h |   6 +
>>>   2 files changed, 74 insertions(+), 49 deletions(-)
>>>
>>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c 
>>> b/drivers/hwtracing/coresight/coresight-tpda.c
>>> index 5f82737c37bb..e3762f38abb3 100644
>>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>>> @@ -28,24 +28,54 @@ static bool coresight_device_is_tpdm(struct 
>>> coresight_device *csdev)
>>>               CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
>>>   }
>>>   +static void tpdm_clear_element_size(struct coresight_device *csdev)
>>> +{
>>> +    struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>>> +
>>> +    if (drvdata->dsb_esize)
>>> +        drvdata->dsb_esize = 0;
>>> +    if (drvdata->cmb_esize)
>>> +        drvdata->cmb_esize = 0;
>>
>> Why do we need the if (...) check here ?
> 
> The element size of all the TPDM sub-unit should be set to 0 here.
> 
> I will update this in the next patch series.
> 
>>
>>> +}
>>> +
>>> +static void tpda_set_element_size(struct tpda_drvdata *drvdata, u32 
>>> *val)
>>> +{
>>> +
>>> +    if (drvdata->dsb_esize == 64)
>>> +        *val |= TPDA_Pn_CR_DSBSIZE;
>>> +    else if (drvdata->dsb_esize == 32)
>>> +        *val &= ~TPDA_Pn_CR_DSBSIZE;
>>> +
>>> +    if (drvdata->cmb_esize == 64)
>>> +        *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x2);
>>> +    else if (drvdata->cmb_esize == 32)
>>> +        *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x1);
>>> +    else if (drvdata->cmb_esize == 8)
>>> +        *val &= ~TPDA_Pn_CR_CMBSIZE;
>>> +}
>>> +
>>
>>
>>>   /*
>>> - * Read the DSB element size from the TPDM device
>>> + * Read the element size from the TPDM device
>>>    * Returns
>>> - *    The dsb element size read from the devicetree if available.
>>> + *    The element size read from the devicetree if available.
>>>    *    0 - Otherwise, with a warning once.
>>
>> This doesn't match the function ? It return 0 on success and
>> error (-EINVAL) on failure ?
> 
> 0 means the element size property is found from the devicetree.
> 
> Otherwise, it will return error(-EINVAL).
> 
> I will update this in the next patch series.
> 
>>
>>>    */
>>> -static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
>>> +static int tpdm_read_element_size(struct tpda_drvdata *drvdata,
>>> +                  struct coresight_device *csdev)
>>>   {
>>> -    int rc = 0;
>>> -    u8 size = 0;
>>> -
>>> -    rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>>> -            "qcom,dsb-element-size", &size);
>>> +    int rc = -EINVAL;
>>> +
>>> +    if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>>> +            "qcom,dsb-element-size", &drvdata->dsb_esize))
>>> +        rc = 0;
>>> +    if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>>> +            "qcom,cmb-element-size", &drvdata->cmb_esize))
>>> +        rc = 0;
>>
>> Are we not silently resetting the error if the former failed ?
>>
>> Could we not :
>>
>>     rc |= fwnode_...
>>
>>     rc |= fwnode_...
>>
>> instead ?
>>
>> Also what is the expectation here ? Are these properties a MUST for
>> TPDM ?
> 
> The TPDM must have one of the element size property. As long as one

Please add a comment in the function. Someone else might try to "fix"
it otherwise.

Suzuki
> 
> can be found, this TPDM configuration can be considered valid. So this
> 
> function will return 0 if one of the element size property is found.


> 
> 
> Best,
> 
> Tao
> 
>>
>>>       if (rc)
>>>           dev_warn_once(&csdev->dev,
>>> -            "Failed to read TPDM DSB Element size: %d\n", rc);
>>> +            "Failed to read TPDM Element size: %d\n", rc);
>>>   -    return size;
>>> +    return rc;
>>>   }
>>>     /*
>>> @@ -56,11 +86,12 @@ static int tpdm_read_dsb_element_size(struct 
>>> coresight_device *csdev)
>>>    * Parameter "inport" is used to pass in the input port number
>>>    * of TPDA, and it is set to -1 in the recursize call.
>>>    */
>>> -static int tpda_get_element_size(struct coresight_device *csdev,
>>> +static int tpda_get_element_size(struct tpda_drvdata *drvdata,
>>> +                 struct coresight_device *csdev,
>>>                    int inport)
>>>   {
>>> -    int dsb_size = -ENOENT;
>>> -    int i, size;
>>> +    int rc = 0;
>>> +    int i;
>>>       struct coresight_device *in;
>>>         for (i = 0; i < csdev->pdata->nr_inconns; i++) {
>>> @@ -74,25 +105,21 @@ static int tpda_get_element_size(struct 
>>> coresight_device *csdev,
>>>               continue;
>>>             if (coresight_device_is_tpdm(in)) {
>>> -            size = tpdm_read_dsb_element_size(in);
>>> +            if ((drvdata->dsb_esize) || (drvdata->cmb_esize))
>>> +                return -EEXIST;
>>> +            rc = tpdm_read_element_size(drvdata, in);
>>> +            if (rc)
>>> +                return rc;
>>>           } else {
>>>               /* Recurse down the path */
>>> -            size = tpda_get_element_size(in, -1);
>>> -        }
>>> -
>>> -        if (size < 0)
>>> -            return size;
>>> -
>>> -        if (dsb_size < 0) {
>>> -            /* Found a size, save it. */
>>> -            dsb_size = size;
>>> -        } else {
>>> -            /* Found duplicate TPDMs */
>>> -            return -EEXIST;
>>> +            rc = tpda_get_element_size(drvdata, in, -1);
>>> +            if (rc)
>>> +                return rc;
>>>           }
>>>       }
>>>   -    return dsb_size;
>>> +
>>> +    return rc;
>>>   }
>>>     /* Settings pre enabling port control register */
>>> @@ -109,7 +136,7 @@ static void tpda_enable_pre_port(struct 
>>> tpda_drvdata *drvdata)
>>>   static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>>>   {
>>>       u32 val;
>>> -    int size;
>>> +    int rc;
>>>         val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
>>>       /*
>>> @@ -117,29 +144,21 @@ static int tpda_enable_port(struct tpda_drvdata 
>>> *drvdata, int port)
>>>        * Set the bit to 0 if the size is 32
>>>        * Set the bit to 1 if the size is 64
>>>        */
>>> -    size = tpda_get_element_size(drvdata->csdev, port);
>>> -    switch (size) {
>>> -    case 32:
>>> -        val &= ~TPDA_Pn_CR_DSBSIZE;
>>> -        break;
>>> -    case 64:
>>> -        val |= TPDA_Pn_CR_DSBSIZE;
>>> -        break;
>>> -    case 0:
>>> -        return -EEXIST;
>>> -    case -EEXIST:
>>> +    tpdm_clear_element_size(drvdata->csdev);
>>> +    rc = tpda_get_element_size(drvdata, drvdata->csdev, port);
>>> +    if (!rc && ((drvdata->dsb_esize) || (drvdata->cmb_esize))) {
>>> +        tpda_set_element_size(drvdata, &val);
>>> +        /* Enable the port */
>>> +        val |= TPDA_Pn_CR_ENA;
>>> +        writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>>> +    } else if (rc == -EEXIST)
>>>           dev_warn_once(&drvdata->csdev->dev,
>>> -            "Detected multiple TPDMs on port %d", -EEXIST);
>>> -        return -EEXIST;
>>> -    default:
>>> -        return -EINVAL;
>>> -    }
>>> -
>>> -    /* Enable the port */
>>> -    val |= TPDA_Pn_CR_ENA;
>>> -    writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>>> +                  "Detected multiple TPDMs on port %d", -EEXIST);
>>> +    else
>>> +        dev_warn_once(&drvdata->csdev->dev,
>>> +                  "Didn't find TPDM elem size");
>>
>> "element size"
>>
>>>   -    return 0;
>>> +    return rc;
>>>   }
>>>     static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
>>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h 
>>> b/drivers/hwtracing/coresight/coresight-tpda.h
>>> index b3b38fd41b64..29164fd9711f 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 CMB data set element size bit */
>>> +#define TPDA_Pn_CR_CMBSIZE        GENMASK(7, 6)
>>>   /* Aggregator port DSB data set element size bit */
>>>   #define TPDA_Pn_CR_DSBSIZE        BIT(8)
>>>   @@ -25,6 +27,8 @@
>>>    * @csdev:      component vitals needed by the framework.
>>>    * @spinlock:   lock for the drvdata value.
>>>    * @enable:     enable status of the component.
>>> + * @dsb_esize   Record the DSB element size.
>>> + * @cmb_esize   Record the CMB element size.
>>>    */
>>>   struct tpda_drvdata {
>>>       void __iomem        *base;
>>> @@ -32,6 +36,8 @@ struct tpda_drvdata {
>>>       struct coresight_device    *csdev;
>>>       spinlock_t        spinlock;
>>>       u8            atid;
>>> +    u8            dsb_esize;
>>> +    u8            cmb_esize;
>>>   };
>>>     #endif  /* _CORESIGHT_CORESIGHT_TPDA_H */
>>
>> Suzuki
>>
>>
Suzuki K Poulose Dec. 19, 2023, 1:59 p.m. UTC | #5
On 18/12/2023 10:27, Suzuki K Poulose wrote:
> On 21/11/2023 02:24, Tao Zhang wrote:
>> Read the CMB element size from the device tree. Set the register
>> bit that controls the CMB element size of the corresponding port.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>> Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-tpda.c | 117 +++++++++++--------
>>   drivers/hwtracing/coresight/coresight-tpda.h |   6 +
>>   2 files changed, 74 insertions(+), 49 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c 
>> b/drivers/hwtracing/coresight/coresight-tpda.c
>> index 5f82737c37bb..e3762f38abb3 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>> @@ -28,24 +28,54 @@ static bool coresight_device_is_tpdm(struct 
>> coresight_device *csdev)
>>               CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
>>   }
>> +static void tpdm_clear_element_size(struct coresight_device *csdev)
>> +{
>> +    struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>> +
>> +    if (drvdata->dsb_esize)
>> +        drvdata->dsb_esize = 0;
>> +    if (drvdata->cmb_esize)
>> +        drvdata->cmb_esize = 0;
> 
> Why do we need the if (...) check here ?
> 
>> +}
>> +
>> +static void tpda_set_element_size(struct tpda_drvdata *drvdata, u32 
>> *val)
>> +{
>> +
>> +    if (drvdata->dsb_esize == 64)
>> +        *val |= TPDA_Pn_CR_DSBSIZE;
>> +    else if (drvdata->dsb_esize == 32)
>> +        *val &= ~TPDA_Pn_CR_DSBSIZE;
>> +
>> +    if (drvdata->cmb_esize == 64)
>> +        *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x2);
>> +    else if (drvdata->cmb_esize == 32)
>> +        *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x1);
>> +    else if (drvdata->cmb_esize == 8)
>> +        *val &= ~TPDA_Pn_CR_CMBSIZE;
>> +}
>> +
> 
> 
>>   /*
>> - * Read the DSB element size from the TPDM device
>> + * Read the element size from the TPDM device
>>    * Returns
>> - *    The dsb element size read from the devicetree if available.
>> + *    The element size read from the devicetree if available.
>>    *    0 - Otherwise, with a warning once.
> 
> This doesn't match the function ? It return 0 on success and
> error (-EINVAL) on failure ?
> 
>>    */
>> -static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
>> +static int tpdm_read_element_size(struct tpda_drvdata *drvdata,
>> +                  struct coresight_device *csdev)
>>   {
>> -    int rc = 0;
>> -    u8 size = 0;
>> -
>> -    rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>> -            "qcom,dsb-element-size", &size);
>> +    int rc = -EINVAL;
>> +
>> +    if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>> +            "qcom,dsb-element-size", &drvdata->dsb_esize))
>> +        rc = 0;
>> +    if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>> +            "qcom,cmb-element-size", &drvdata->cmb_esize))

At this point we have the csdev->dev.parent as the TPDM device and with:

#include <coresight-tpdm.h>

	struct tpdm_drvdata *tpdm_data = get_drvdata(csdev->dev.parent);

	if (tpdm_has_cmb(tpdm_data)) {
		rc = fwnode_...(... "qcom,cmb-element-size"...)
	}

	if (tpdm_has_dsb(tpdm_data)) {
		rc = fwnode_...(..., "qcom,dsb-element-size"..)
	}

Suzuki


>> +        rc = 0;
> 
> Are we not silently resetting the error if the former failed ?
> 
> Could we not :
> 
>      rc |= fwnode_...
> 
>      rc |= fwnode_...
> 
> instead ?
> 
> Also what is the expectation here ? Are these properties a MUST for
> TPDM ?
> 
>>       if (rc)
>>           dev_warn_once(&csdev->dev,
>> -            "Failed to read TPDM DSB Element size: %d\n", rc);
>> +            "Failed to read TPDM Element size: %d\n", rc);
>> -    return size;
>> +    return rc;
>>   }
>>   /*
>> @@ -56,11 +86,12 @@ static int tpdm_read_dsb_element_size(struct 
>> coresight_device *csdev)
>>    * Parameter "inport" is used to pass in the input port number
>>    * of TPDA, and it is set to -1 in the recursize call.
>>    */
>> -static int tpda_get_element_size(struct coresight_device *csdev,
>> +static int tpda_get_element_size(struct tpda_drvdata *drvdata,
>> +                 struct coresight_device *csdev,
>>                    int inport)
>>   {
>> -    int dsb_size = -ENOENT;
>> -    int i, size;
>> +    int rc = 0;
>> +    int i;
>>       struct coresight_device *in;
>>       for (i = 0; i < csdev->pdata->nr_inconns; i++) {
>> @@ -74,25 +105,21 @@ static int tpda_get_element_size(struct 
>> coresight_device *csdev,
>>               continue;
>>           if (coresight_device_is_tpdm(in)) {
>> -            size = tpdm_read_dsb_element_size(in);
>> +            if ((drvdata->dsb_esize) || (drvdata->cmb_esize))
>> +                return -EEXIST;
>> +            rc = tpdm_read_element_size(drvdata, in);
>> +            if (rc)
>> +                return rc;
>>           } else {
>>               /* Recurse down the path */
>> -            size = tpda_get_element_size(in, -1);
>> -        }
>> -
>> -        if (size < 0)
>> -            return size;
>> -
>> -        if (dsb_size < 0) {
>> -            /* Found a size, save it. */
>> -            dsb_size = size;
>> -        } else {
>> -            /* Found duplicate TPDMs */
>> -            return -EEXIST;
>> +            rc = tpda_get_element_size(drvdata, in, -1);
>> +            if (rc)
>> +                return rc;
>>           }
>>       }
>> -    return dsb_size;
>> +
>> +    return rc;
>>   }
>>   /* Settings pre enabling port control register */
>> @@ -109,7 +136,7 @@ static void tpda_enable_pre_port(struct 
>> tpda_drvdata *drvdata)
>>   static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>>   {
>>       u32 val;
>> -    int size;
>> +    int rc;
>>       val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
>>       /*
>> @@ -117,29 +144,21 @@ static int tpda_enable_port(struct tpda_drvdata 
>> *drvdata, int port)
>>        * Set the bit to 0 if the size is 32
>>        * Set the bit to 1 if the size is 64
>>        */
>> -    size = tpda_get_element_size(drvdata->csdev, port);
>> -    switch (size) {
>> -    case 32:
>> -        val &= ~TPDA_Pn_CR_DSBSIZE;
>> -        break;
>> -    case 64:
>> -        val |= TPDA_Pn_CR_DSBSIZE;
>> -        break;
>> -    case 0:
>> -        return -EEXIST;
>> -    case -EEXIST:
>> +    tpdm_clear_element_size(drvdata->csdev);
>> +    rc = tpda_get_element_size(drvdata, drvdata->csdev, port);
>> +    if (!rc && ((drvdata->dsb_esize) || (drvdata->cmb_esize))) {
>> +        tpda_set_element_size(drvdata, &val);
>> +        /* Enable the port */
>> +        val |= TPDA_Pn_CR_ENA;
>> +        writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>> +    } else if (rc == -EEXIST)
>>           dev_warn_once(&drvdata->csdev->dev,
>> -            "Detected multiple TPDMs on port %d", -EEXIST);
>> -        return -EEXIST;
>> -    default:
>> -        return -EINVAL;
>> -    }
>> -
>> -    /* Enable the port */
>> -    val |= TPDA_Pn_CR_ENA;
>> -    writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>> +                  "Detected multiple TPDMs on port %d", -EEXIST);
>> +    else
>> +        dev_warn_once(&drvdata->csdev->dev,
>> +                  "Didn't find TPDM elem size");
> 
> "element size"
> 
>> -    return 0;
>> +    return rc;
>>   }
>>   static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h 
>> b/drivers/hwtracing/coresight/coresight-tpda.h
>> index b3b38fd41b64..29164fd9711f 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 CMB data set element size bit */
>> +#define TPDA_Pn_CR_CMBSIZE        GENMASK(7, 6)
>>   /* Aggregator port DSB data set element size bit */
>>   #define TPDA_Pn_CR_DSBSIZE        BIT(8)
>> @@ -25,6 +27,8 @@
>>    * @csdev:      component vitals needed by the framework.
>>    * @spinlock:   lock for the drvdata value.
>>    * @enable:     enable status of the component.
>> + * @dsb_esize   Record the DSB element size.
>> + * @cmb_esize   Record the CMB element size.
>>    */
>>   struct tpda_drvdata {
>>       void __iomem        *base;
>> @@ -32,6 +36,8 @@ struct tpda_drvdata {
>>       struct coresight_device    *csdev;
>>       spinlock_t        spinlock;
>>       u8            atid;
>> +    u8            dsb_esize;
>> +    u8            cmb_esize;
>>   };
>>   #endif  /* _CORESIGHT_CORESIGHT_TPDA_H */
> 
> Suzuki
> 
>
Tao Zhang Dec. 20, 2023, 12:27 a.m. UTC | #6
On 12/19/2023 9:54 PM, Suzuki K Poulose wrote:
> On 19/12/2023 02:13, Tao Zhang wrote:
>>
>> On 12/18/2023 6:27 PM, Suzuki K Poulose wrote:
>>> On 21/11/2023 02:24, Tao Zhang wrote:
>>>> Read the CMB element size from the device tree. Set the register
>>>> bit that controls the CMB element size of the corresponding port.
>>>>
>>>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>>>> Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
>>>> ---
>>>>   drivers/hwtracing/coresight/coresight-tpda.c | 117 
>>>> +++++++++++--------
>>>>   drivers/hwtracing/coresight/coresight-tpda.h |   6 +
>>>>   2 files changed, 74 insertions(+), 49 deletions(-)
>>>>
>>>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c 
>>>> b/drivers/hwtracing/coresight/coresight-tpda.c
>>>> index 5f82737c37bb..e3762f38abb3 100644
>>>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>>>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>>>> @@ -28,24 +28,54 @@ static bool coresight_device_is_tpdm(struct 
>>>> coresight_device *csdev)
>>>>               CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
>>>>   }
>>>>   +static void tpdm_clear_element_size(struct coresight_device *csdev)
>>>> +{
>>>> +    struct tpda_drvdata *drvdata = 
>>>> dev_get_drvdata(csdev->dev.parent);
>>>> +
>>>> +    if (drvdata->dsb_esize)
>>>> +        drvdata->dsb_esize = 0;
>>>> +    if (drvdata->cmb_esize)
>>>> +        drvdata->cmb_esize = 0;
>>>
>>> Why do we need the if (...) check here ?
>>
>> The element size of all the TPDM sub-unit should be set to 0 here.
>>
>> I will update this in the next patch series.
>>
>>>
>>>> +}
>>>> +
>>>> +static void tpda_set_element_size(struct tpda_drvdata *drvdata, 
>>>> u32 *val)
>>>> +{
>>>> +
>>>> +    if (drvdata->dsb_esize == 64)
>>>> +        *val |= TPDA_Pn_CR_DSBSIZE;
>>>> +    else if (drvdata->dsb_esize == 32)
>>>> +        *val &= ~TPDA_Pn_CR_DSBSIZE;
>>>> +
>>>> +    if (drvdata->cmb_esize == 64)
>>>> +        *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x2);
>>>> +    else if (drvdata->cmb_esize == 32)
>>>> +        *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x1);
>>>> +    else if (drvdata->cmb_esize == 8)
>>>> +        *val &= ~TPDA_Pn_CR_CMBSIZE;
>>>> +}
>>>> +
>>>
>>>
>>>>   /*
>>>> - * Read the DSB element size from the TPDM device
>>>> + * Read the element size from the TPDM device
>>>>    * Returns
>>>> - *    The dsb element size read from the devicetree if available.
>>>> + *    The element size read from the devicetree if available.
>>>>    *    0 - Otherwise, with a warning once.
>>>
>>> This doesn't match the function ? It return 0 on success and
>>> error (-EINVAL) on failure ?
>>
>> 0 means the element size property is found from the devicetree.
>>
>> Otherwise, it will return error(-EINVAL).
>>
>> I will update this in the next patch series.
>>
>>>
>>>>    */
>>>> -static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
>>>> +static int tpdm_read_element_size(struct tpda_drvdata *drvdata,
>>>> +                  struct coresight_device *csdev)
>>>>   {
>>>> -    int rc = 0;
>>>> -    u8 size = 0;
>>>> -
>>>> -    rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>>>> -            "qcom,dsb-element-size", &size);
>>>> +    int rc = -EINVAL;
>>>> +
>>>> +    if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>>>> +            "qcom,dsb-element-size", &drvdata->dsb_esize))
>>>> +        rc = 0;
>>>> +    if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>>>> +            "qcom,cmb-element-size", &drvdata->cmb_esize))
>>>> +        rc = 0;
>>>
>>> Are we not silently resetting the error if the former failed ?
>>>
>>> Could we not :
>>>
>>>     rc |= fwnode_...
>>>
>>>     rc |= fwnode_...
>>>
>>> instead ?
>>>
>>> Also what is the expectation here ? Are these properties a MUST for
>>> TPDM ?
>>
>> The TPDM must have one of the element size property. As long as one
>
> Please add a comment in the function. Someone else might try to "fix"
> it otherwise.

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


Best,

Tao

>
> Suzuki
>>
>> can be found, this TPDM configuration can be considered valid. So this
>>
>> function will return 0 if one of the element size property is found.
>
>
>>
>>
>> Best,
>>
>> Tao
>>
>>>
>>>>       if (rc)
>>>>           dev_warn_once(&csdev->dev,
>>>> -            "Failed to read TPDM DSB Element size: %d\n", rc);
>>>> +            "Failed to read TPDM Element size: %d\n", rc);
>>>>   -    return size;
>>>> +    return rc;
>>>>   }
>>>>     /*
>>>> @@ -56,11 +86,12 @@ static int tpdm_read_dsb_element_size(struct 
>>>> coresight_device *csdev)
>>>>    * Parameter "inport" is used to pass in the input port number
>>>>    * of TPDA, and it is set to -1 in the recursize call.
>>>>    */
>>>> -static int tpda_get_element_size(struct coresight_device *csdev,
>>>> +static int tpda_get_element_size(struct tpda_drvdata *drvdata,
>>>> +                 struct coresight_device *csdev,
>>>>                    int inport)
>>>>   {
>>>> -    int dsb_size = -ENOENT;
>>>> -    int i, size;
>>>> +    int rc = 0;
>>>> +    int i;
>>>>       struct coresight_device *in;
>>>>         for (i = 0; i < csdev->pdata->nr_inconns; i++) {
>>>> @@ -74,25 +105,21 @@ static int tpda_get_element_size(struct 
>>>> coresight_device *csdev,
>>>>               continue;
>>>>             if (coresight_device_is_tpdm(in)) {
>>>> -            size = tpdm_read_dsb_element_size(in);
>>>> +            if ((drvdata->dsb_esize) || (drvdata->cmb_esize))
>>>> +                return -EEXIST;
>>>> +            rc = tpdm_read_element_size(drvdata, in);
>>>> +            if (rc)
>>>> +                return rc;
>>>>           } else {
>>>>               /* Recurse down the path */
>>>> -            size = tpda_get_element_size(in, -1);
>>>> -        }
>>>> -
>>>> -        if (size < 0)
>>>> -            return size;
>>>> -
>>>> -        if (dsb_size < 0) {
>>>> -            /* Found a size, save it. */
>>>> -            dsb_size = size;
>>>> -        } else {
>>>> -            /* Found duplicate TPDMs */
>>>> -            return -EEXIST;
>>>> +            rc = tpda_get_element_size(drvdata, in, -1);
>>>> +            if (rc)
>>>> +                return rc;
>>>>           }
>>>>       }
>>>>   -    return dsb_size;
>>>> +
>>>> +    return rc;
>>>>   }
>>>>     /* Settings pre enabling port control register */
>>>> @@ -109,7 +136,7 @@ static void tpda_enable_pre_port(struct 
>>>> tpda_drvdata *drvdata)
>>>>   static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>>>>   {
>>>>       u32 val;
>>>> -    int size;
>>>> +    int rc;
>>>>         val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
>>>>       /*
>>>> @@ -117,29 +144,21 @@ static int tpda_enable_port(struct 
>>>> tpda_drvdata *drvdata, int port)
>>>>        * Set the bit to 0 if the size is 32
>>>>        * Set the bit to 1 if the size is 64
>>>>        */
>>>> -    size = tpda_get_element_size(drvdata->csdev, port);
>>>> -    switch (size) {
>>>> -    case 32:
>>>> -        val &= ~TPDA_Pn_CR_DSBSIZE;
>>>> -        break;
>>>> -    case 64:
>>>> -        val |= TPDA_Pn_CR_DSBSIZE;
>>>> -        break;
>>>> -    case 0:
>>>> -        return -EEXIST;
>>>> -    case -EEXIST:
>>>> +    tpdm_clear_element_size(drvdata->csdev);
>>>> +    rc = tpda_get_element_size(drvdata, drvdata->csdev, port);
>>>> +    if (!rc && ((drvdata->dsb_esize) || (drvdata->cmb_esize))) {
>>>> +        tpda_set_element_size(drvdata, &val);
>>>> +        /* Enable the port */
>>>> +        val |= TPDA_Pn_CR_ENA;
>>>> +        writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>>>> +    } else if (rc == -EEXIST)
>>>>           dev_warn_once(&drvdata->csdev->dev,
>>>> -            "Detected multiple TPDMs on port %d", -EEXIST);
>>>> -        return -EEXIST;
>>>> -    default:
>>>> -        return -EINVAL;
>>>> -    }
>>>> -
>>>> -    /* Enable the port */
>>>> -    val |= TPDA_Pn_CR_ENA;
>>>> -    writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>>>> +                  "Detected multiple TPDMs on port %d", -EEXIST);
>>>> +    else
>>>> +        dev_warn_once(&drvdata->csdev->dev,
>>>> +                  "Didn't find TPDM elem size");
>>>
>>> "element size"
>>>
>>>>   -    return 0;
>>>> +    return rc;
>>>>   }
>>>>     static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
>>>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h 
>>>> b/drivers/hwtracing/coresight/coresight-tpda.h
>>>> index b3b38fd41b64..29164fd9711f 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 CMB data set element size bit */
>>>> +#define TPDA_Pn_CR_CMBSIZE        GENMASK(7, 6)
>>>>   /* Aggregator port DSB data set element size bit */
>>>>   #define TPDA_Pn_CR_DSBSIZE        BIT(8)
>>>>   @@ -25,6 +27,8 @@
>>>>    * @csdev:      component vitals needed by the framework.
>>>>    * @spinlock:   lock for the drvdata value.
>>>>    * @enable:     enable status of the component.
>>>> + * @dsb_esize   Record the DSB element size.
>>>> + * @cmb_esize   Record the CMB element size.
>>>>    */
>>>>   struct tpda_drvdata {
>>>>       void __iomem        *base;
>>>> @@ -32,6 +36,8 @@ struct tpda_drvdata {
>>>>       struct coresight_device    *csdev;
>>>>       spinlock_t        spinlock;
>>>>       u8            atid;
>>>> +    u8            dsb_esize;
>>>> +    u8            cmb_esize;
>>>>   };
>>>>     #endif  /* _CORESIGHT_CORESIGHT_TPDA_H */
>>>
>>> Suzuki
>>>
>>>
>
Tao Zhang Dec. 20, 2023, 8:55 a.m. UTC | #7
On 12/19/2023 9:59 PM, Suzuki K Poulose wrote:
> On 18/12/2023 10:27, Suzuki K Poulose wrote:
>> On 21/11/2023 02:24, Tao Zhang wrote:
>>> Read the CMB element size from the device tree. Set the register
>>> bit that controls the CMB element size of the corresponding port.
>>>
>>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>>> Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
>>> ---
>>>   drivers/hwtracing/coresight/coresight-tpda.c | 117 
>>> +++++++++++--------
>>>   drivers/hwtracing/coresight/coresight-tpda.h |   6 +
>>>   2 files changed, 74 insertions(+), 49 deletions(-)
>>>
>>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c 
>>> b/drivers/hwtracing/coresight/coresight-tpda.c
>>> index 5f82737c37bb..e3762f38abb3 100644
>>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>>> @@ -28,24 +28,54 @@ static bool coresight_device_is_tpdm(struct 
>>> coresight_device *csdev)
>>>               CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
>>>   }
>>> +static void tpdm_clear_element_size(struct coresight_device *csdev)
>>> +{
>>> +    struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>>> +
>>> +    if (drvdata->dsb_esize)
>>> +        drvdata->dsb_esize = 0;
>>> +    if (drvdata->cmb_esize)
>>> +        drvdata->cmb_esize = 0;
>>
>> Why do we need the if (...) check here ?
>>
>>> +}
>>> +
>>> +static void tpda_set_element_size(struct tpda_drvdata *drvdata, u32 
>>> *val)
>>> +{
>>> +
>>> +    if (drvdata->dsb_esize == 64)
>>> +        *val |= TPDA_Pn_CR_DSBSIZE;
>>> +    else if (drvdata->dsb_esize == 32)
>>> +        *val &= ~TPDA_Pn_CR_DSBSIZE;
>>> +
>>> +    if (drvdata->cmb_esize == 64)
>>> +        *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x2);
>>> +    else if (drvdata->cmb_esize == 32)
>>> +        *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x1);
>>> +    else if (drvdata->cmb_esize == 8)
>>> +        *val &= ~TPDA_Pn_CR_CMBSIZE;
>>> +}
>>> +
>>
>>
>>>   /*
>>> - * Read the DSB element size from the TPDM device
>>> + * Read the element size from the TPDM device
>>>    * Returns
>>> - *    The dsb element size read from the devicetree if available.
>>> + *    The element size read from the devicetree if available.
>>>    *    0 - Otherwise, with a warning once.
>>
>> This doesn't match the function ? It return 0 on success and
>> error (-EINVAL) on failure ?
>>
>>>    */
>>> -static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
>>> +static int tpdm_read_element_size(struct tpda_drvdata *drvdata,
>>> +                  struct coresight_device *csdev)
>>>   {
>>> -    int rc = 0;
>>> -    u8 size = 0;
>>> -
>>> -    rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>>> -            "qcom,dsb-element-size", &size);
>>> +    int rc = -EINVAL;
>>> +
>>> +    if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>>> +            "qcom,dsb-element-size", &drvdata->dsb_esize))
>>> +        rc = 0;
>>> +    if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>>> +            "qcom,cmb-element-size", &drvdata->cmb_esize))
>
> At this point we have the csdev->dev.parent as the TPDM device and with:
>
> #include <coresight-tpdm.h>
>
>     struct tpdm_drvdata *tpdm_data = get_drvdata(csdev->dev.parent);
>
>     if (tpdm_has_cmb(tpdm_data)) {
>         rc = fwnode_...(... "qcom,cmb-element-size"...)
>     }
>
>     if (tpdm_has_dsb(tpdm_data)) {
>         rc = fwnode_...(..., "qcom,dsb-element-size"..)
>     }

I will update according to your approach in the next patch series.


Best,

Tao

>
> Suzuki
>
>
>>> +        rc = 0;
>>
>> Are we not silently resetting the error if the former failed ?
>>
>> Could we not :
>>
>>      rc |= fwnode_...
>>
>>      rc |= fwnode_...
>>
>> instead ?
>>
>> Also what is the expectation here ? Are these properties a MUST for
>> TPDM ?
>>
>>>       if (rc)
>>>           dev_warn_once(&csdev->dev,
>>> -            "Failed to read TPDM DSB Element size: %d\n", rc);
>>> +            "Failed to read TPDM Element size: %d\n", rc);
>>> -    return size;
>>> +    return rc;
>>>   }
>>>   /*
>>> @@ -56,11 +86,12 @@ static int tpdm_read_dsb_element_size(struct 
>>> coresight_device *csdev)
>>>    * Parameter "inport" is used to pass in the input port number
>>>    * of TPDA, and it is set to -1 in the recursize call.
>>>    */
>>> -static int tpda_get_element_size(struct coresight_device *csdev,
>>> +static int tpda_get_element_size(struct tpda_drvdata *drvdata,
>>> +                 struct coresight_device *csdev,
>>>                    int inport)
>>>   {
>>> -    int dsb_size = -ENOENT;
>>> -    int i, size;
>>> +    int rc = 0;
>>> +    int i;
>>>       struct coresight_device *in;
>>>       for (i = 0; i < csdev->pdata->nr_inconns; i++) {
>>> @@ -74,25 +105,21 @@ static int tpda_get_element_size(struct 
>>> coresight_device *csdev,
>>>               continue;
>>>           if (coresight_device_is_tpdm(in)) {
>>> -            size = tpdm_read_dsb_element_size(in);
>>> +            if ((drvdata->dsb_esize) || (drvdata->cmb_esize))
>>> +                return -EEXIST;
>>> +            rc = tpdm_read_element_size(drvdata, in);
>>> +            if (rc)
>>> +                return rc;
>>>           } else {
>>>               /* Recurse down the path */
>>> -            size = tpda_get_element_size(in, -1);
>>> -        }
>>> -
>>> -        if (size < 0)
>>> -            return size;
>>> -
>>> -        if (dsb_size < 0) {
>>> -            /* Found a size, save it. */
>>> -            dsb_size = size;
>>> -        } else {
>>> -            /* Found duplicate TPDMs */
>>> -            return -EEXIST;
>>> +            rc = tpda_get_element_size(drvdata, in, -1);
>>> +            if (rc)
>>> +                return rc;
>>>           }
>>>       }
>>> -    return dsb_size;
>>> +
>>> +    return rc;
>>>   }
>>>   /* Settings pre enabling port control register */
>>> @@ -109,7 +136,7 @@ static void tpda_enable_pre_port(struct 
>>> tpda_drvdata *drvdata)
>>>   static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>>>   {
>>>       u32 val;
>>> -    int size;
>>> +    int rc;
>>>       val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
>>>       /*
>>> @@ -117,29 +144,21 @@ static int tpda_enable_port(struct 
>>> tpda_drvdata *drvdata, int port)
>>>        * Set the bit to 0 if the size is 32
>>>        * Set the bit to 1 if the size is 64
>>>        */
>>> -    size = tpda_get_element_size(drvdata->csdev, port);
>>> -    switch (size) {
>>> -    case 32:
>>> -        val &= ~TPDA_Pn_CR_DSBSIZE;
>>> -        break;
>>> -    case 64:
>>> -        val |= TPDA_Pn_CR_DSBSIZE;
>>> -        break;
>>> -    case 0:
>>> -        return -EEXIST;
>>> -    case -EEXIST:
>>> +    tpdm_clear_element_size(drvdata->csdev);
>>> +    rc = tpda_get_element_size(drvdata, drvdata->csdev, port);
>>> +    if (!rc && ((drvdata->dsb_esize) || (drvdata->cmb_esize))) {
>>> +        tpda_set_element_size(drvdata, &val);
>>> +        /* Enable the port */
>>> +        val |= TPDA_Pn_CR_ENA;
>>> +        writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>>> +    } else if (rc == -EEXIST)
>>>           dev_warn_once(&drvdata->csdev->dev,
>>> -            "Detected multiple TPDMs on port %d", -EEXIST);
>>> -        return -EEXIST;
>>> -    default:
>>> -        return -EINVAL;
>>> -    }
>>> -
>>> -    /* Enable the port */
>>> -    val |= TPDA_Pn_CR_ENA;
>>> -    writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>>> +                  "Detected multiple TPDMs on port %d", -EEXIST);
>>> +    else
>>> +        dev_warn_once(&drvdata->csdev->dev,
>>> +                  "Didn't find TPDM elem size");
>>
>> "element size"
>>
>>> -    return 0;
>>> +    return rc;
>>>   }
>>>   static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
>>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h 
>>> b/drivers/hwtracing/coresight/coresight-tpda.h
>>> index b3b38fd41b64..29164fd9711f 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 CMB data set element size bit */
>>> +#define TPDA_Pn_CR_CMBSIZE        GENMASK(7, 6)
>>>   /* Aggregator port DSB data set element size bit */
>>>   #define TPDA_Pn_CR_DSBSIZE        BIT(8)
>>> @@ -25,6 +27,8 @@
>>>    * @csdev:      component vitals needed by the framework.
>>>    * @spinlock:   lock for the drvdata value.
>>>    * @enable:     enable status of the component.
>>> + * @dsb_esize   Record the DSB element size.
>>> + * @cmb_esize   Record the CMB element size.
>>>    */
>>>   struct tpda_drvdata {
>>>       void __iomem        *base;
>>> @@ -32,6 +36,8 @@ struct tpda_drvdata {
>>>       struct coresight_device    *csdev;
>>>       spinlock_t        spinlock;
>>>       u8            atid;
>>> +    u8            dsb_esize;
>>> +    u8            cmb_esize;
>>>   };
>>>   #endif  /* _CORESIGHT_CORESIGHT_TPDA_H */
>>
>> Suzuki
>>
>>
>
diff mbox series

Patch

diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
index 5f82737c37bb..e3762f38abb3 100644
--- a/drivers/hwtracing/coresight/coresight-tpda.c
+++ b/drivers/hwtracing/coresight/coresight-tpda.c
@@ -28,24 +28,54 @@  static bool coresight_device_is_tpdm(struct coresight_device *csdev)
 			CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
 }
 
+static void tpdm_clear_element_size(struct coresight_device *csdev)
+{
+	struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+	if (drvdata->dsb_esize)
+		drvdata->dsb_esize = 0;
+	if (drvdata->cmb_esize)
+		drvdata->cmb_esize = 0;
+}
+
+static void tpda_set_element_size(struct tpda_drvdata *drvdata, u32 *val)
+{
+
+	if (drvdata->dsb_esize == 64)
+		*val |= TPDA_Pn_CR_DSBSIZE;
+	else if (drvdata->dsb_esize == 32)
+		*val &= ~TPDA_Pn_CR_DSBSIZE;
+
+	if (drvdata->cmb_esize == 64)
+		*val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x2);
+	else if (drvdata->cmb_esize == 32)
+		*val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x1);
+	else if (drvdata->cmb_esize == 8)
+		*val &= ~TPDA_Pn_CR_CMBSIZE;
+}
+
 /*
- * Read the DSB element size from the TPDM device
+ * Read the element size from the TPDM device
  * Returns
- *    The dsb element size read from the devicetree if available.
+ *    The element size read from the devicetree if available.
  *    0 - Otherwise, with a warning once.
  */
-static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
+static int tpdm_read_element_size(struct tpda_drvdata *drvdata,
+				  struct coresight_device *csdev)
 {
-	int rc = 0;
-	u8 size = 0;
-
-	rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
-			"qcom,dsb-element-size", &size);
+	int rc = -EINVAL;
+
+	if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
+			"qcom,dsb-element-size", &drvdata->dsb_esize))
+		rc = 0;
+	if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
+			"qcom,cmb-element-size", &drvdata->cmb_esize))
+		rc = 0;
 	if (rc)
 		dev_warn_once(&csdev->dev,
-			"Failed to read TPDM DSB Element size: %d\n", rc);
+			"Failed to read TPDM Element size: %d\n", rc);
 
-	return size;
+	return rc;
 }
 
 /*
@@ -56,11 +86,12 @@  static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
  * Parameter "inport" is used to pass in the input port number
  * of TPDA, and it is set to -1 in the recursize call.
  */
-static int tpda_get_element_size(struct coresight_device *csdev,
+static int tpda_get_element_size(struct tpda_drvdata *drvdata,
+				 struct coresight_device *csdev,
 				 int inport)
 {
-	int dsb_size = -ENOENT;
-	int i, size;
+	int rc = 0;
+	int i;
 	struct coresight_device *in;
 
 	for (i = 0; i < csdev->pdata->nr_inconns; i++) {
@@ -74,25 +105,21 @@  static int tpda_get_element_size(struct coresight_device *csdev,
 			continue;
 
 		if (coresight_device_is_tpdm(in)) {
-			size = tpdm_read_dsb_element_size(in);
+			if ((drvdata->dsb_esize) || (drvdata->cmb_esize))
+				return -EEXIST;
+			rc = tpdm_read_element_size(drvdata, in);
+			if (rc)
+				return rc;
 		} else {
 			/* Recurse down the path */
-			size = tpda_get_element_size(in, -1);
-		}
-
-		if (size < 0)
-			return size;
-
-		if (dsb_size < 0) {
-			/* Found a size, save it. */
-			dsb_size = size;
-		} else {
-			/* Found duplicate TPDMs */
-			return -EEXIST;
+			rc = tpda_get_element_size(drvdata, in, -1);
+			if (rc)
+				return rc;
 		}
 	}
 
-	return dsb_size;
+
+	return rc;
 }
 
 /* Settings pre enabling port control register */
@@ -109,7 +136,7 @@  static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
 static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
 {
 	u32 val;
-	int size;
+	int rc;
 
 	val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
 	/*
@@ -117,29 +144,21 @@  static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
 	 * Set the bit to 0 if the size is 32
 	 * Set the bit to 1 if the size is 64
 	 */
-	size = tpda_get_element_size(drvdata->csdev, port);
-	switch (size) {
-	case 32:
-		val &= ~TPDA_Pn_CR_DSBSIZE;
-		break;
-	case 64:
-		val |= TPDA_Pn_CR_DSBSIZE;
-		break;
-	case 0:
-		return -EEXIST;
-	case -EEXIST:
+	tpdm_clear_element_size(drvdata->csdev);
+	rc = tpda_get_element_size(drvdata, drvdata->csdev, port);
+	if (!rc && ((drvdata->dsb_esize) || (drvdata->cmb_esize))) {
+		tpda_set_element_size(drvdata, &val);
+		/* Enable the port */
+		val |= TPDA_Pn_CR_ENA;
+		writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
+	} else if (rc == -EEXIST)
 		dev_warn_once(&drvdata->csdev->dev,
-			"Detected multiple TPDMs on port %d", -EEXIST);
-		return -EEXIST;
-	default:
-		return -EINVAL;
-	}
-
-	/* Enable the port */
-	val |= TPDA_Pn_CR_ENA;
-	writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
+			      "Detected multiple TPDMs on port %d", -EEXIST);
+	else
+		dev_warn_once(&drvdata->csdev->dev,
+			      "Didn't find TPDM elem size");
 
-	return 0;
+	return rc;
 }
 
 static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h
index b3b38fd41b64..29164fd9711f 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 CMB data set element size bit */
+#define TPDA_Pn_CR_CMBSIZE		GENMASK(7, 6)
 /* Aggregator port DSB data set element size bit */
 #define TPDA_Pn_CR_DSBSIZE		BIT(8)
 
@@ -25,6 +27,8 @@ 
  * @csdev:      component vitals needed by the framework.
  * @spinlock:   lock for the drvdata value.
  * @enable:     enable status of the component.
+ * @dsb_esize   Record the DSB element size.
+ * @cmb_esize   Record the CMB element size.
  */
 struct tpda_drvdata {
 	void __iomem		*base;
@@ -32,6 +36,8 @@  struct tpda_drvdata {
 	struct coresight_device	*csdev;
 	spinlock_t		spinlock;
 	u8			atid;
+	u8			dsb_esize;
+	u8			cmb_esize;
 };
 
 #endif  /* _CORESIGHT_CORESIGHT_TPDA_H */