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

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Date:   Mon, 2 Oct 2023 15:28:48 +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>,
        suzuki.poulose@....com, mike.leach@...aro.org, leo.yan@...aro.org
Subject: Re: [PATCH 2/7] coresight: tmc-etr: Add support to use reserved trace
 memory



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