linux-kernel - Re: [PATCH] coresight: core: Add coresight name support

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Message-ID: <180a66b1-6996-c705-5d8a-0a69ce0353d7@quicinc.com>
Date:   Thu, 9 Feb 2023 10:16:57 +0800
From:   Jinlong Mao <quic_jinlmao@...cinc.com>
To:     Suzuki K Poulose <suzuki.poulose@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
CC:     <coresight@...ts.linaro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        "Tingwei Zhang" <quic_tingweiz@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Tao Zhang <quic_taozha@...cinc.com>,
        Hao Zhang <quic_hazha@...cinc.com>
Subject: Re: [PATCH] coresight: core: Add coresight name support


On 2/8/2023 10:26 PM, Suzuki K Poulose wrote:
> On 08/02/2023 11:07, Mao Jinlong wrote:
>> Apart from STM and ETM sources, there will be more sources added to
>> coresight components. For example, there are over 10 TPDM sources.
>> Add coresight name support for custom names which will be
>> easy to identify the source.
>>
>
> As we have previously discussed, please don't make this a generic
> code change. If your device has a "specifici" name, use that for
> allocating in the driver and leave the core code alone.
>
> Suzuki
>
Hi Suzuki,

Not only for TPDMs. There could be dozens of CTI devices.
It is hard for user to know which CTI device it is with current names.

Thanks
Jinlong Mao
>
>> Signed-off-by: Mao Jinlong <quic_jinlmao@...cinc.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-core.c | 34 +++++++++++---------
>>   1 file changed, 19 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-core.c 
>> b/drivers/hwtracing/coresight/coresight-core.c
>> index d3bf82c0de1d..5e95d9c7f256 100644
>> --- a/drivers/hwtracing/coresight/coresight-core.c
>> +++ b/drivers/hwtracing/coresight/coresight-core.c
>> @@ -1733,28 +1733,32 @@ char *coresight_alloc_device_name(struct 
>> coresight_dev_list *dict,
>>   {
>>       int idx;
>>       char *name = NULL;
>> +    const char *coresight_name = NULL;
>>       struct fwnode_handle **list;
>> +    struct device_node *node = dev->of_node;
>>         mutex_lock(&coresight_mutex);
>>   -    idx = coresight_search_device_idx(dict, dev_fwnode(dev));
>> -    if (idx < 0) {
>> -        /* Make space for the new entry */
>> -        idx = dict->nr_idx;
>> -        list = krealloc_array(dict->fwnode_list,
>> -                      idx + 1, sizeof(*dict->fwnode_list),
>> -                      GFP_KERNEL);
>> -        if (ZERO_OR_NULL_PTR(list)) {
>> -            idx = -ENOMEM;
>> -            goto done;
>> +    if (!of_property_read_string(node, "coresight-name", 
>> &coresight_name))
>> +        name = devm_kasprintf(dev, GFP_KERNEL, "%s", coresight_name);
>> +    else {
>> +        idx = coresight_search_device_idx(dict, dev_fwnode(dev));
>> +        if (idx < 0) {
>> +            /* Make space for the new entry */
>> +            idx = dict->nr_idx;
>> +            list = krealloc_array(dict->fwnode_list,
>> +                          idx + 1, sizeof(*dict->fwnode_list),
>> +                          GFP_KERNEL);
>> +            if (ZERO_OR_NULL_PTR(list))
>> +                goto done;
>> +
>> +            list[idx] = dev_fwnode(dev);
>> +            dict->fwnode_list = list;
>> +            dict->nr_idx = idx + 1;
>>           }
>>   -        list[idx] = dev_fwnode(dev);
>> -        dict->fwnode_list = list;
>> -        dict->nr_idx = idx + 1;
>> +        name = devm_kasprintf(dev, GFP_KERNEL, "%s%d", dict->pfx, idx);
>>       }
>> -
>> -    name = devm_kasprintf(dev, GFP_KERNEL, "%s%d", dict->pfx, idx);
>>   done:
>>       mutex_unlock(&coresight_mutex);
>>       return name;
>