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From:   Jim Quinlan <james.quinlan@broadcom.com>
To:     Christoph Hellwig <hch@lst.de>,
        bcm-kernel-feedback-list@broadcom.com, jim2101024@gmail.com,
        james.quinlan@broadcom.com
Cc:     Russell King <linux@armlinux.org.uk>,
        Arnd Bergmann <arnd@arndb.de>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
        Linus Walleij <linus.walleij@linaro.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Thomas Gleixner <tglx@linutronix.de>,
        Sebastian Reichel <sebastian.reichel@collabora.com>,
        "Mike Rapoport (IBM)" <rppt@kernel.org>,
        Eric DeVolder <eric.devolder@oracle.com>,
        Nathan Chancellor <nathan@kernel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        linux-arm-kernel@lists.infradead.org (moderated list:ARM PORT),
        linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v1 1/1] ARM: Select DMA_DIRECT_REMAP to fix restricted DMA
Date:   Tue, 26 Sep 2023 13:52:06 -0400
Message-Id: <20230926175208.9298-2-james.quinlan@broadcom.com>
In-Reply-To: <20230926175208.9298-1-james.quinlan@broadcom.com>
References: <20230926175208.9298-1-james.quinlan@broadcom.com>
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--00000000000033bbac060646bc5b

Without this commit, the use of dma_alloc_coherent() while
using CONFIG_DMA_RESTRICTED_POOL=y breaks devices from working.
For example, the common Wifi 7260 chip (iwlwifi) works fine
on arm64 with restricted memory but not on arm, unless this
commit is applied.

Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
---
 arch/arm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 9557808e8937..b6f1cea923cf 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -34,6 +34,7 @@ config ARM
 	select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT if CPU_V7
 	select ARCH_SUPPORTS_ATOMIC_RMW
 	select ARCH_SUPPORTS_HUGETLBFS if ARM_LPAE
+	select DMA_DIRECT_REMAP
 	select ARCH_USE_BUILTIN_BSWAP
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select ARCH_USE_MEMTEST
-- 
2.17.1


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