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

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Message-Id: <20230130200820.82084-2-nfraprado@collabora.com>
Date:   Mon, 30 Jan 2023 15:08:20 -0500
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
Cc:     kernel@...labora.com,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Nícolas F. R. A. Prado 
        <nfraprado@...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: [PATCH v3 2/2] arm64: defconfig: Enable DMA_RESTRICTED_POOL

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>

---

Changes in v3:
- Added this patch

 arch/arm64/configs/defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index be40004a0259..4e806d8068f6 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -1422,6 +1422,7 @@ CONFIG_CRYPTO_DEV_HISI_SEC2=m
 CONFIG_CRYPTO_DEV_HISI_ZIP=m
 CONFIG_CRYPTO_DEV_HISI_HPRE=m
 CONFIG_CRYPTO_DEV_HISI_TRNG=m
+CONFIG_DMA_RESTRICTED_POOL=y
 CONFIG_CMA_SIZE_MBYTES=32
 CONFIG_PRINTK_TIME=y
 CONFIG_DEBUG_KERNEL=y
-- 
2.39.1