linux-kernel - Re: [PATCH v3 RESEND 01/10] coresight: core: Refactoring ctcu_get_active

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Message-ID: <4850a2a5-dbeb-43f4-9005-1cc022545dcd@oss.qualcomm.com>
Date: Thu, 17 Jul 2025 08:55:39 +0800
From: Jie Gan <jie.gan@....qualcomm.com>
To: Mike Leach <mike.leach@...aro.org>, Jie Gan <jie.gan@....qualcomm.com>
Cc: Suzuki K Poulose <suzuki.poulose@....com>,
        James Clark <james.clark@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Mao Jinlong <quic_jinlmao@...cinc.com>, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 RESEND 01/10] coresight: core: Refactoring
 ctcu_get_active_port and make it generic



On 7/16/2025 6:20 PM, Mike Leach wrote:
> Hi,
> 
> On Mon, 14 Jul 2025 at 07:31, Jie Gan <jie.gan@....qualcomm.com> wrote:
>>
>> Remove ctcu_get_active_port from CTCU module and add it to the core
>> framework.
>>
>> The port number is crucial for the CTCU device to identify which ETR
>> it serves. With the port number we can correctly get required parameters
>> of the CTCU device in TMC module.
>>
>> Signed-off-by: Jie Gan <jie.gan@....qualcomm.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-core.c  | 24 +++++++++++++++++++
>>   .../hwtracing/coresight/coresight-ctcu-core.c | 19 +--------------
>>   drivers/hwtracing/coresight/coresight-priv.h  |  2 ++
>>   3 files changed, 27 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
>> index 1accd7cbd54b..5297a5ff7921 100644
>> --- a/drivers/hwtracing/coresight/coresight-core.c
>> +++ b/drivers/hwtracing/coresight/coresight-core.c
>> @@ -580,6 +580,30 @@ struct coresight_device *coresight_get_sink(struct coresight_path *path)
>>   }
>>   EXPORT_SYMBOL_GPL(coresight_get_sink);
>>
>> +/**
>> + * coresight_get_port_helper: get the in-port number of the helper device
>> + * that is connected to the csdev.
>> + *
> 
> As written this looks at all connections, not just those that are
> helpers. That is fine, so perhaps rename as such.
> 
> e.g. coresight_get_in_port_dest
> 
> and name the input parameters src , dest respectively.

Make sense for me, will update in next version.
Thanks for the suggestion.

> 
>> + * @csdev: csdev of the device that is connected to helper.
>> + * @helper: csdev of the helper device.
>> + *
>> + * Return: port number upson success or -EINVAL for fail.
> 
> sp: upon/upson
> 
>> + */
>> +int coresight_get_port_helper(struct coresight_device *csdev,
>> +                             struct coresight_device *helper)
>> +{
>> +       struct coresight_platform_data *pdata = helper->pdata;
>> +       int i;
>> +
>> +       for (i = 0; i < pdata->nr_inconns; ++i) {
>> +               if (pdata->in_conns[i]->src_dev == csdev)
>> +                       return pdata->in_conns[i]->dest_port;
>> +       }
>> +
>> +       return -EINVAL;
>> +}
>> +EXPORT_SYMBOL_GPL(coresight_get_port_helper);
>> +
>>   u32 coresight_get_sink_id(struct coresight_device *csdev)
>>   {
>>          if (!csdev->ea)
>> diff --git a/drivers/hwtracing/coresight/coresight-ctcu-core.c b/drivers/hwtracing/coresight/coresight-ctcu-core.c
>> index c6bafc96db96..28ea4a216345 100644
>> --- a/drivers/hwtracing/coresight/coresight-ctcu-core.c
>> +++ b/drivers/hwtracing/coresight/coresight-ctcu-core.c
>> @@ -118,23 +118,6 @@ static int __ctcu_set_etr_traceid(struct coresight_device *csdev, u8 traceid, in
>>          return 0;
>>   }
>>
>> -/*
>> - * Searching the sink device from helper's view in case there are multiple helper devices
>> - * connected to the sink device.
>> - */
>> -static int ctcu_get_active_port(struct coresight_device *sink, struct coresight_device *helper)
>> -{
>> -       struct coresight_platform_data *pdata = helper->pdata;
>> -       int i;
>> -
>> -       for (i = 0; i < pdata->nr_inconns; ++i) {
>> -               if (pdata->in_conns[i]->src_dev == sink)
>> -                       return pdata->in_conns[i]->dest_port;
>> -       }
>> -
>> -       return -EINVAL;
>> -}
>> -
>>   static int ctcu_set_etr_traceid(struct coresight_device *csdev, struct coresight_path *path,
>>                                  bool enable)
>>   {
>> @@ -147,7 +130,7 @@ static int ctcu_set_etr_traceid(struct coresight_device *csdev, struct coresight
>>                  return -EINVAL;
>>          }
>>
>> -       port_num = ctcu_get_active_port(sink, csdev);
>> +       port_num = coresight_get_port_helper(sink, csdev);
>>          if (port_num < 0)
>>                  return -EINVAL;
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
>> index 33e22b1ba043..07a5f03de81d 100644
>> --- a/drivers/hwtracing/coresight/coresight-priv.h
>> +++ b/drivers/hwtracing/coresight/coresight-priv.h
>> @@ -156,6 +156,8 @@ void coresight_remove_links(struct coresight_device *orig,
>>   u32 coresight_get_sink_id(struct coresight_device *csdev);
>>   void coresight_path_assign_trace_id(struct coresight_path *path,
>>                                     enum cs_mode mode);
>> +int coresight_get_port_helper(struct coresight_device *csdev,
>> +                             struct coresight_device *helper);
>>
> rename here too

will do.

Best Regards,
Jie

> 
>>   #if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM3X)
>>   int etm_readl_cp14(u32 off, unsigned int *val);
>> --
>> 2.34.1
>>
> 
> regards
> 
> Mike