linux-kernel - Re: [PATCH] coresight: Fix data argument to coresight_enable

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Message-ID: <9d8f3a84-8c89-48a8-9996-4602bbabd446@arm.com>
Date: Fri, 19 Sep 2025 08:43:56 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Jie Gan <jie.gan@....qualcomm.com>,
 Carl Worth <carl@...amperecomputing.com>, Mike Leach
 <mike.leach@...aro.org>, James Clark <james.clark@...aro.org>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Sabrina Dubroca <sd@...asysnail.net>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] coresight: Fix data argument to coresight_enable_helpers

On 19/09/2025 02:20, Jie Gan wrote:
> 
> 
> On 9/19/2025 6:18 AM, Carl Worth wrote:
>> Jie Gan <jie.gan@....qualcomm.com> writes:
>>> I dont think we can change back to sink_data since we introduced
>>> coresight_path to wrap 'data' which is needed by the path.
>>>
>>> I suggest you to add the struct perf_output_handle to the
>>> coresight_path, then retrieving it with data->perf_handle in
>>> tmc_etr_get_buffer.
>> ...
>>> We can assign the perf_output_handle to the coresight_path after we
>>> constructed the coresight_path in perf mode.
>>
>> Thanks. That much makes sense to me, and I'll put together a patch along
>> those lines.
>>
>> But, further: with core coresight code assembling into the path all the
>> data that is necessary, is there any reason to be using void* in these
>> enable/disable functions?
> 
> In my opinion, yes, we can change void * to coresight_path * for 
> helper's enable/disable functions since we have everything in path so 
> the cast is not necessary now.
> 
>>
>> Could we also change these functions to accept a coresight_path* and
>> actually get some compiler help at finding mistakes like the one we're
>> fixing here?
> 


Yes, please. I was going to suggest that. May be we could do that as
a separate patch after fixing the problem here first (so that it
can be back ported).

This was initially a perf_handle only used for the perf mode, and
it didn't make sens to have a "perf" argument to "enable" which
could be used for both sysfs and perf. Now that the path
is a generic data structure, it makes sense to move everything
to accept the path.

Suzuki


> That's the only benefit in my mind so far.
> 
> Thanks,
> Jie
> 
>>
>> -Carl
>