linux-kernel - Re: [PATCH v3 2/2] arm64: defconfig: Enable DMA_RESTRICTED

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Message-ID: <ea37d824-5bfa-9e6c-a007-c5b794cd44e3@collabora.com>
Date:   Wed, 1 Feb 2023 14:13:06 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     kernel@...labora.com, Arnd Bergmann <arnd@...db.de>,
        Bjorn Andersson <quic_bjorande@...cinc.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Shawn Guo <shawnguo@...nel.org>, Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] arm64: defconfig: Enable DMA_RESTRICTED_POOL

Il 30/01/23 21:08, Nícolas F. R. A. Prado ha scritto:
> Enable support for restricted DMA pools which provide a level of DMA
> memory protection on systems with limited hardware protection
> capabilities, such as those lacking an IOMMU.
> 
> For instance, mt8192-asurada-spherion makes use of this to provide a
> restricted DMA region for WiFi since its MT7921E WiFi card is connected
> through PCIe, and the MT8192 SoC doesn't have an IOMMU context for the
> PCIe controller.
> 
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> 

On MT8173 Elm, MT8192 Spherion, MT8195 Tomato:

Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>