linux-kernel - Re: [PATCH 2/2] coresight: fix handling of ETM trace register access via sysfs

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Date:	Thu, 4 Aug 2016 16:58:41 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] coresight: fix handling of ETM trace register access
 via sysfs



On 04/08/16 16:46, Mathieu Poirier wrote:
> On 3 August 2016 at 10:12, Sudeep Holla <sudeep.holla@....com> wrote:
>> The ETM registers are classified into 2 categories: trace and management.
>> The core power domain contains most of the trace unit logic including
>> all(except TRCOSLAR and TRCOSLSR) the trace registers. The debug power
>> domain contains the external debugger interface including all management
>> registers.
>>
>> This patch adds coresight unit specific function coresight_simple_func
>> which can be used for ETM trace registers by providing a ETM specific
>> read function which does smp cross call to ensure the trace core is
>> powered up before the register is accessed.
>>
>> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
>> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
>
> Hey Sudeep,
>
> I'm good with this patch - just a few things to amend below.
>
> Many thanks,
> Mathieu
>
>> ---
>>  drivers/hwtracing/coresight/coresight-etb10.c      |  2 +-
>>  .../hwtracing/coresight/coresight-etm3x-sysfs.c    |  2 +-
>>  .../hwtracing/coresight/coresight-etm4x-sysfs.c    | 58 ++++++++++++++++------
>>  drivers/hwtracing/coresight/coresight-etm4x.h      |  1 +
>>  drivers/hwtracing/coresight/coresight-priv.h       |  9 +++-
>>  drivers/hwtracing/coresight/coresight-stm.c        |  2 +-
>>  drivers/hwtracing/coresight/coresight-tmc.c        |  2 +-
>>  7 files changed, 54 insertions(+), 22 deletions(-)
>>
>> Hi Mathieu,
>>
>> I think the latest release of the firmware(inparticular SCP v1.16.0) for
>
> Is this public?  If so please give me the link so that we test with
> the same environment.
>

Yes I believe so. You should be able to grab latest @[1]

I agree with all the other comments, will repost v2 soon.

-- 
Regards,
Sudeep

[1] 
https://snapshots.linaro.org/member-builds/armlt-platforms-release/28/juno-uefi.zip