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

Hi Krzysztof,

-----Original Message-----
From: Krzysztof Kozlowski <redacted>
Sent: Friday, January 5, 2024 3:24 PM
To: Linu Cherian <redacted>; suzuki.poulose@arm.com;
mike.leach@linaro.org; james.clark@arm.com; leo.yan@linaro.org
Cc: linux-arm-kernel@lists.infradead.org; coresight@lists.linaro.org; linux-
kernel@vger.kernel.org; robh+dt@kernel.org;
krzysztof.kozlowski+dt@linaro.org; conor+dt@kernel.org;
devicetree@vger.kernel.org; Sunil Kovvuri Goutham
[off-list ref]; George Cherian [off-list ref]; Rob
Herring [off-list ref]
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:

quoted

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@kernel.org>

...

quoted

+  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

quoted

+          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.
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