Message-ID: <ea37d824-5bfa-9e6c-a007-c5b794cd44e3@collabora.com>
Date:   Wed, 1 Feb 2023 14:13:06 +0100
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Subject: Re: [PATCH v3 2/2] arm64: defconfig: Enable DMA_RESTRICTED_POOL
To:     =?UTF-8?B?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= 
        <nfraprado@collabora.com>,
        Matthias Brugger <matthias.bgg@gmail.com>
Cc:     kernel@collabora.com, Arnd Bergmann <arnd@arndb.de>,
        Bjorn Andersson <quic_bjorande@quicinc.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        Marcel Ziswiler <marcel.ziswiler@toradex.com>,
        Shawn Guo <shawnguo@kernel.org>, Will Deacon <will@kernel.org>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
References: <20230130200820.82084-1-nfraprado@collabora.com>
 <20230130200820.82084-2-nfraprado@collabora.com>
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From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
In-Reply-To: <20230130200820.82084-2-nfraprado@collabora.com>
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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@collabora.com>
> 

On MT8173 Elm, MT8192 Spherion, MT8195 Tomato:

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