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

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Date: Fri, 12 Jan 2024 23:09:51 +0000
From: Linu Cherian <lcherian@...vell.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "suzuki.poulose@....com" <suzuki.poulose@....com>,
        "mike.leach@...aro.org"
	<mike.leach@...aro.org>,
        "james.clark@....com" <james.clark@....com>,
        "leo.yan@...aro.org" <leo.yan@...aro.org>
CC: "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>,
        "coresight@...ts.linaro.org"
	<coresight@...ts.linaro.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        George Cherian <gcherian@...vell.com>, Rob Herring <robh@...nel.org>
Subject: RE: [EXT] Re: [PATCH v6 1/7] dt-bindings: arm: coresight-tmc: Add
 "memory-region" property

Hi Krzysztof,

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: Friday, January 5, 2024 3:24 PM
> 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; Sunil Kovvuri Goutham
> <sgoutham@...vell.com>; George Cherian <gcherian@...vell.com>; Rob
> Herring <robh@...nel.org>
> Subject: [EXT] Re: [PATCH v6 1/7] dt-bindings: arm: coresight-tmc: Add
> "memory-region" property
> 
> External Email
> 
> ----------------------------------------------------------------------
> 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.
> 

Okay. Will take care in next version.

Linu Cherian.