From: Marc Zyngier <maz@kernel.org>
To: Ben Dai <ben.dai9703@gmail.com>
Cc: tglx@linutronix.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] irqchip/gic-v3: Allow 'dma-noncoherent' property for ITS
Date: Sun, 12 Feb 2023 11:48:13 +0000 [thread overview]
Message-ID: <87mt5jksua.wl-maz@kernel.org> (raw)
In-Reply-To: <20230212093505.5754-1-ben.dai9703@gmail.com>
On Sun, 12 Feb 2023 09:35:05 +0000,
Ben Dai <ben.dai9703@gmail.com> wrote:
>
> Currently the ITS driver expects the hardware to report whether it is
> shareable, but according to the description of the GITS_CBASER register
> in the GICv3 architecture specification:
> > It is IMPLEMENTATION DEFINED whether this field has a fixed value or
> > can be programmed by software. Implementing this field with a fixed
> > value is deprecated.
>
> It means that the hardware may expect the software to correctly configure
> the access attributes of the ITS. In order to support those designs where
> ITS and CPU are not in a coherent domain, allow 'dma-noncoherent' property
> for ITS.
No. This is an integration bug, most likely a Rockchip quality
design. I have repeatedly explained how to deal with this, and I'm not
going to do that again. Please search the list archives.
I will not be taking this sort of patch.
M.
--
Without deviation from the norm, progress is not possible.
prev parent reply other threads:[~2023-02-12 11:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-12 9:35 [PATCH] irqchip/gic-v3: Allow 'dma-noncoherent' property for ITS Ben Dai
2023-02-12 11:48 ` Marc Zyngier [this message]
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