linux-kernel - Re: [PATCH 1/7] irqchip/gic-v3: Add a DMA Non-Coherent flag

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Date:   Fri, 10 Mar 2023 08:56:28 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Lucas Tanure <lucas.tanure@...labora.com>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczynski <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, Qu Wenruo <wqu@...e.com>,
        Piotr Oniszczuk <piotr.oniszczuk@...il.com>,
        Peter Geis <pgwipeout@...il.com>,
        Kever Yang <kever.yang@...k-chips.com>,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, kernel@...labora.com,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH 1/7] irqchip/gic-v3: Add a DMA Non-Coherent flag

On 2023-03-10 08:05, Lucas Tanure wrote:
> The GIC600 integration in RK356x, used in rk3588, doesn't support
> any of the shareability or cacheability attributes, and requires
> both values to be set to 0b00 for all the ITS and Redistributor
> tables.
> 
> This is loosely based on prior work from XiaoDong Huang and
> Peter Geis fixing this issue specifically for Rockchip 356x.

No.

If we are going to do *anything* about this thing, it is by
describing the actual topology. And it has to work for both DT
and ACPI.

Alternatively, this is an erratum.

         M.
-- 
Jazz is not dead. It just smells funny...