linux-kernel - Re: [PATCH v6 1/7] dt-bindings: arm: coresight-tmc: Add "memory-region" property

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Date: Fri, 5 Jan 2024 10:54:23 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Linu Cherian <lcherian@...vell.com>, suzuki.poulose@....com,
 mike.leach@...aro.org, james.clark@....com, leo.yan@...aro.org
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,
 Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v6 1/7] dt-bindings: arm: coresight-tmc: Add
 "memory-region" property

On 05/01/2024 06:58, Linu Cherian wrote:
> memory-region 0: Reserved trace buffer memory
> 
>   TMC ETR: When available, use this reserved memory region for
>   trace data capture. Same region is used for trace data
>   retention after a panic or watchdog reset.
> 
>   TMC ETF: When available, use this reserved memory region for
>   trace data retention synced from internal SRAM after a panic or
>   watchdog reset.
> 
> memory-region 1: Reserved meta data memory
> 
>   TMC ETR, ETF: When available, use this memory for register
>   snapshot retention synced from hardware registers after a panic
>   or watchdog reset.
> 
> Reviewed-by: Rob Herring <robh@...nel.org>

...

> +  memory-region:
> +    items:
> +      - description: Reserved trace buffer memory for ETR and ETF sinks.
> +          For ETR, this reserved memory region is used for trace data capture.
> +          Same region is used for trace data retention as well after a panic
> +          or watchdog reset.
> +          This reserved memory region is used as trace buffer or used for trace
> +          data retention only if specifically selected by the user in sysfs
> +          interface.
> +          The default memory usage models for ETR in sysfs/perf modes are
> +          otherwise unaltered.
> +
> +          For ETF, this reserved memory region is used by default for
> +          retention of trace data synced from internal SRAM after a panic
> +          or watchdog reset.
> +      - description: Reserved meta data memory. Used for ETR and ETF sinks
> +          for storing metadata.

If there is going to be new version/resend, add a blank line here. Keep
the Rb tag.


Best regards,
Krzysztof