linux-kernel - Re: [BUG] CoreSight: WARN_ON in coresight_disclaim_device_unlocked due to register reset on CPU power-cycle

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Message-ID: <20250623085937.894003-1-keyz@google.com>
Date: Mon, 23 Jun 2025 16:59:37 +0800
From: Keita Morisaki <keyz@...gle.com>
To: suzuki.poulose@....com
Cc: alexander.shishkin@...ux.intel.com, coresight@...ts.linaro.org, 
	ericchancf@...gle.com, james.clark@...aro.org, keyz@...gle.com, 
	leo.yan@....com, linux-kernel@...r.kernel.org, mike.leach@...aro.org, 
	yimingtseng@...gle.com
Subject: Re: [BUG] CoreSight: WARN_ON in coresight_disclaim_device_unlocked
 due to register reset on CPU power-cycle

> We have the ETM driver performing the save/restore of ETM context during
> a CPUidle. This is only done when the ETM/ETE is described to be loosing
> context over PM operation. If this is not done (via DT), the driver
> doesn't do anything. This could be problematic. Could you try adding:
>
> "arm,coresight-loses-context-with-cpu"
>
>
> property to the ETE nodes and see if it makes a difference ?

I tried this in our environment, and this worked well. The "arm,coresight-loses-context-with-cpu" property was what we needed.
Thank you so much again for the swift response with the useful information!

Best,
Keita