[v6,05/10] coresight-tpda: Add support to configure CMB element

Read the CMB element size from the device tree. Set the register
bit that controls the CMB element size of the corresponding port.

Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
---
 drivers/hwtracing/coresight/coresight-tpda.c | 125 +++++++++++--------
 drivers/hwtracing/coresight/coresight-tpda.h |   6 +
 2 files changed, 81 insertions(+), 50 deletions(-)

On 2/2/2024 6:06 PM, Suzuki K Poulose wrote:
> On 02/02/2024 09:45, Suzuki K Poulose wrote:
>> On 02/02/2024 09:32, 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.
>>>
>>> Reviewed-by: James Clark <james.clark@arm.com>
>>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>>> Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
>>> ---
>>>   drivers/hwtracing/coresight/coresight-tpda.c | 125 
>>> +++++++++++--------
>>>   drivers/hwtracing/coresight/coresight-tpda.h |   6 +
>>>   2 files changed, 81 insertions(+), 50 deletions(-)
>>>
>>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c 
>>> b/drivers/hwtracing/coresight/coresight-tpda.c
>>> index 4ac954f4bc13..27d567f4c8bf 100644
>>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>>> @@ -18,6 +18,7 @@
>>>   #include "coresight-priv.h"
>>>   #include "coresight-tpda.h"
>>>   #include "coresight-trace-id.h"
>>> +#include "coresight-tpdm.h"
>>>   DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda");
>>> @@ -28,24 +29,59 @@ 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)
>>
>> I just noticed this anomaly. This is supposed to be :
>>
>> tpda_clear_element_size() ? I can fix it up locally.
>>
>>
>> Suzuki
>>
>>
>>> +{
>>> +    struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>>> +
>>> +    drvdata->dsb_esize = 0;
>>> +    drvdata->cmb_esize = 0;
>>> +}
>>> +
>>> +static void tpda_set_element_size(struct tpda_drvdata *drvdata, u32 
>>> *val)
>>> +{
>>> +    /* Clear all relevant fields */
>>> +    *val &= ~(TPDA_Pn_CR_DSBSIZE | TPDA_Pn_CR_CMBSIZE);
>>> +
>>> +    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. One TPDM must have 
>>> at least one of the
>>> + * element size property.
>>>    * Returns
>>> - *    The dsb element size read from the devicetree if available.
>>> - *    0 - Otherwise, with a warning once.
>>> + *    0 - The element size property is read
>>> + *    Others - Cannot read the property of the element size
>>>    */
>>> -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;
>>> +    int rc = -EINVAL;
>>> +    struct tpdm_drvdata *tpdm_data = 
>>> dev_get_drvdata(csdev->dev.parent);
>>> +
>>> +    if (tpdm_has_dsb_dataset(tpdm_data)) {
>>> +        rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>>> +                "qcom,dsb-element-size", &drvdata->dsb_esize);
>>> +    }
>>> +    if (tpdm_has_cmb_dataset(tpdm_data)) {
>>> +        rc = fwnode_property_read_u32(dev_fwnode(csdev->dev.parent),
>>> +                "qcom,cmb-element-bits", &drvdata->cmb_esize);
>>> +    }
>>> -    rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>>> -            "qcom,dsb-element-size", &size);
>>>       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 +92,12 @@ 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++) {
>>> @@ -69,30 +106,26 @@ static int tpda_get_element_size(struct 
>>> coresight_device *csdev,
>>>               continue;
>>>           /* Ignore the paths that do not match port */
>>> -        if (inport > 0 &&
>>> +        if (inport >= 0 &&
>>>               csdev->pdata->in_conns[i]->dest_port != inport)
>>>               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 +142,7 @@ 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 +150,21 @@ 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
>>>        */
>
> The comment above is stale, you need to remove it. I noticed it
> after I applied the series for my build tests.
>
> Please could you respin the series with the two issues above fixed ?

Sure, I will update them to the new patch series soon.


Best,

Tao

>
> Suzuki
>
>
>>> -    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", port);
>>> +    else
>>> +        dev_warn_once(&drvdata->csdev->dev,
>>> +                  "Didn't find TPDM 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..19af64120fcf 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;
>>> +    u32            cmb_esize;
>>>   };
>>>   #endif  /* _CORESIGHT_CORESIGHT_TPDA_H */
>>
>