linux-kernel - Re: [PATCH 2/7] coresight: tmc-etr: Add support to use reserved trace memory

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Message-ID: <8de7702c-797f-9aa8-0ca3-bd8d6b7f39db@arm.com>
Date:   Mon, 2 Oct 2023 15:41:05 +0100
From:   James Clark <james.clark@....com>
To:     Linu Cherian <lcherian@...vell.com>
Cc:     linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        devicetree@...r.kernel.org, sgoutham@...vell.com,
        gcherian@...vell.com, Anil Kumar Reddy <areddy3@...vell.com>,
        mike.leach@...aro.org
Subject: Re: [PATCH 2/7] coresight: tmc-etr: Add support to use reserved trace
 memory



On 02/10/2023 15:28, James Clark wrote:
> 
> 
> On 29/09/2023 14:37, Linu Cherian wrote:
>> Add support to use reserved memory for coresight ETR trace buffer.
>>
>> Introduce a new ETR buffer mode called ETR_MODE_RESRV, which
>> becomes available when ETR device tree node is supplied with a valid
>> reserved memory region.
>>
>> ETR_MODE_RESRV can be selected only by explicit user request.
>>
>> $ echo resrv >/sys/bus/coresight/devices/tmc_etr<N>/buf_mode_preferred
>>
>> Signed-off-by: Anil Kumar Reddy <areddy3@...vell.com>
>> Signed-off-by: Linu Cherian <lcherian@...vell.com>
>> ---
>>  .../hwtracing/coresight/coresight-tmc-core.c  | 51 +++++++++++
>>  .../hwtracing/coresight/coresight-tmc-etr.c   | 87 ++++++++++++++++++-
>>  drivers/hwtracing/coresight/coresight-tmc.h   | 24 +++++
>>  3 files changed, 161 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tmc-core.c b/drivers/hwtracing/coresight/coresight-tmc-core.c
>> index 7ec5365e2b64..1e94215ac148 100644
>> --- a/drivers/hwtracing/coresight/coresight-tmc-core.c
>> +++ b/drivers/hwtracing/coresight/coresight-tmc-core.c
> 
> [...]
> 
>> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
>> index 834674feb6b4..fca82eaf073f 100644
> 
> Hi Linu,
> 
> I think this version of coresight-tmc-etr.c isn't in the tree and it
> makes it hard to apply the set. Do you have local changes? Or if it
> requires other patches it might be best to host the full set on your own
> repo and link to it:
> 
>   $ git show 834674feb6b4
>   fatal: ambiguous argument '834674feb6b4': unknown revision or path not
>   in the working tree.
>   Use '--' to separate paths from revisions, like this:
>   'git <command> [<revision>...] -- [<file>...]'
> 
> Thanks
> James

Sorry just saw the note at the top of the cover letter about the other
patches.

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