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From: tingwei@codeaurora.org
To: Will Deacon <will@kernel.org>, Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Set DBGCLAIM when self-host debug is enabled
Date: Wed, 06 Jan 2021 18:29:53 +0800	[thread overview]
Message-ID: <512a30e6cc6877687c10c0f9ccc3c4c5@codeaurora.org> (raw)

Hi Will and Mark,

In recent implementation of save/restore ARM debug registers in EL2/EL3, 
we found
it's necessary to know whether self-host debug is enabled so EL2/EL3 can 
avoid
saving/restoring debug registers but no one is using debug.

In ARM PSCI, it has one option to set DBGCLAIM[1] to 1 to indicate that 
debug is
in use by a self-host debugger. Do you think it's resonable to add this 
to Kernel?

For example, can we set DBGCLAIM[1] to 1 in enable_debug_monitors() and 
clear it
in disable_debug_monitors().

Thanks,
Tingwei

--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora 
Forum, a Linux Foundation Collaborative Project

             reply	other threads:[~2021-01-06 10:31 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-06 10:29 tingwei [this message]
2021-01-06 12:23 ` Set DBGCLAIM when self-host debug is enabled Mark Rutland
2021-01-08  4:00   ` Tingwei Zhang
2021-01-11 11:44     ` Mark Rutland

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