linux-kernel - Re: [PATCH] irqchip/gic-v3-its: remove the shareability of ITS

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Message-ID: <86fsdorfs9.wl-maz@kernel.org>
Date:   Fri, 09 Dec 2022 11:13:26 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Harry Song <jundongsong1@...il.com>
Cc:     Sebastian Reichel <sebastian.reichel@...labora.com>,
        tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] irqchip/gic-v3-its: remove the shareability of ITS

On Fri, 09 Dec 2022 03:34:21 +0000,
Harry Song <jundongsong1@...il.com> wrote:
> 
> Thank you for your reply. I know these two links.
> My email is to ask about the root cause of this bug.
> 
> I would like to know whether the driver design of ITS requires that
> the CPU and ITS must be in a shared domain. Such as using CCI in
> chips;

This problem has nothing to do with CCI or coherency. It has to do
with how the GIC is plugged in the interconnect and what attributes it
advertises.

	M.

-- 
Without deviation from the norm, progress is not possible.