linux-kernel - Re: [PATCH v4 02/11] coresight-tpda: Add DSB dataset support

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Message-ID: <b5dd9d63-fb11-e343-a0a6-4aa8217fd7b3@quicinc.com>
Date:   Thu, 25 May 2023 15:20:58 +0800
From:   Tao Zhang <quic_taozha@...cinc.com>
To:     Suzuki K Poulose <suzuki.poulose@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Konrad Dybcio <konradybcio@...il.com>,
        Mike Leach <mike.leach@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     Jinlong Mao <quic_jinlmao@...cinc.com>,
        Leo Yan <leo.yan@...aro.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        <coresight@...ts.linaro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Hao Zhang <quic_hazha@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <andersson@...nel.org>
Subject: Re: [PATCH v4 02/11] coresight-tpda: Add DSB dataset support


On 5/23/2023 10:48 PM, Suzuki K Poulose wrote:
> On 23/05/2023 11:07, Suzuki K Poulose wrote:
>> On 27/04/2023 10:00, 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@...cinc.com>
>>> ---
>>>   drivers/hwtracing/coresight/coresight-core.c |  1 +
>>>   drivers/hwtracing/coresight/coresight-tpda.c | 92 
>>> +++++++++++++++++++++++++---
>>>   drivers/hwtracing/coresight/coresight-tpda.h |  4 ++
>>>   drivers/hwtracing/coresight/coresight-tpdm.c |  2 +-
>>>   include/linux/coresight.h                    |  1 +
>>>   5 files changed, 90 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/drivers/hwtracing/coresight/coresight-core.c 
>>> b/drivers/hwtracing/coresight/coresight-core.c
>>> index 2af416b..f1eacbb 100644
>>> --- a/drivers/hwtracing/coresight/coresight-core.c
>>> +++ b/drivers/hwtracing/coresight/coresight-core.c
>>> @@ -1092,6 +1092,7 @@ static int coresight_validate_source(struct 
>>> coresight_device *csdev,
>>>       if (subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_PROC &&
>>>           subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE &&
>>> +        subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM &&
>>>           subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS) {
>>>           dev_err(&csdev->dev, "wrong device subtype in %s\n", 
>>> function);
>>>           return -EINVAL;
>>
>> Please see the comment at the bottom.
>>
>>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c 
>>> b/drivers/hwtracing/coresight/coresight-tpda.c
>>> index 8d2b9d2..af9c72f 100644
>>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>>> @@ -21,6 +21,56 @@
>>>   DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda");
>>> +/* Search and read element data size from the TPDM node in
>>> + * 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.
>>> + */
>>> +static int tpda_set_element_size(struct tpda_drvdata *drvdata,
>>> +               struct coresight_device *csdev, int inport, bool 
>>> parent)
>
> The name parent is a bit confusing. It could imply parent device ? That
> is kind of inverse ? because, parent = true, indicates the parent device
> of tpda, which is not true. Could we simply say
>
> bool match_inport => When true, the dest_port of the connection from the
> csdev must match the inport ? And ...
>
Sure, 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 (parent) {
>>> +        nr_inport = inport;
>>> +        tpdm_found = false;
>>> +    }
>>> +
>>> +    for (i = 0; i < csdev->pdata->nr_inconns; i++) {
>>> +        in_csdev = csdev->pdata->in_conns[i]->src_dev;
>>> +        if (!in_csdev)
>>> +            break;
>>> +
>>> +        if (parent)
>>> +            if (csdev->pdata->in_conns[i]->dest_port != inport)
>>> +                continue;
>
> The above can become :
>
>         if (match_inport &&
>         csdev->pdata->in_conns[i]->dest_port != inport)
>         continue;

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


Best,

Tao

>
> Suzuki
>