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SubjectRe: [PATCH] Documentation: coresight: Update the generic device names
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Hi Mathieu,

On 03/06/2019 20:01, Mathieu Poirier wrote:
> Hi Suzuki,
>
> On Thu, May 30, 2019 at 04:11:17PM +0100, Suzuki K Poulose wrote:
>> Update the documentation to reflect the new naming scheme with
>> latest changes.
>>
>> Reported-by: Leo Yan <leo.yan@linaro.org>
>> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
>> Cc: Jonathan Corbet <corbet@lwn.net>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
>> ---
>> Documentation/trace/coresight.txt | 34 +++++++++++++++++++---------------
>> 1 file changed, 19 insertions(+), 15 deletions(-)
>>
>> diff --git a/Documentation/trace/coresight.txt b/Documentation/trace/coresight.txt
>> index efbc832..7b427cf 100644
>> --- a/Documentation/trace/coresight.txt
>> +++ b/Documentation/trace/coresight.txt
>> @@ -326,16 +326,20 @@ amount of processor cores), the "cs_etm" PMU will be listed only once.
>> A Coresight PMU works the same way as any other PMU, i.e the name of the PMU is
>> listed along with configuration options within forward slashes '/'. Since a
>> Coresight system will typically have more than one sink, the name of the sink to
>> -work with needs to be specified as an event option. Names for sink to choose
>> -from are listed in sysFS under ($SYSFS)/bus/coresight/devices:
>> +work with needs to be specified as an event option.
>> +On newer kernels the available sinks are listed in sysFS under:
>> +($SYSFS)/bus/event_source/devices/cs_etm/sinks/
>>
>> - root@linaro-nano:~# ls /sys/bus/coresight/devices/
>> - 20010000.etf 20040000.funnel 20100000.stm 22040000.etm
>> - 22140000.etm 230c0000.funnel 23240000.etm 20030000.tpiu
>> - 20070000.etr 20120000.replicator 220c0000.funnel
>> - 23040000.etm 23140000.etm 23340000.etm
>> + root@localhost:/sys/bus/event_source/devices/cs_etm/sinks# ls
>> + tmc_etf0 tmc_etr0 tpiu0
>>
>> - root@linaro-nano:~# perf record -e cs_etm/@20070000.etr/u --per-thread program
>> +On older kernels, this may need to be found from the list of coresight devices,
>> +available under ($SYSFS)/bus/coresight/devices/:
>> +
>> + root@localhost:/sys/bus/coresight/devices# ls
>> + etm0 etm1 etm2 etm3 etm4 etm5 funnel0 funnel1 funnel2 replicator0 stm0 tmc_etf0 tmc_etr0 tpiu0
>> +
>> + root@linaro-nano:~# perf record -e cs_etm/@tmc_etr0/u --per-thread program
>
> On the "older" kernels you are referring to one would find the original naming
> convention. Everything else looks good to me.

True, but do we care what we see there ? All we care about is the location,
where to find them. I could fix it, if you think thats needed.

Cheers
Suzuki

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