linux-kernel - [PATCH v2] ARM: virt, vexpress: Use 64-bit DMA for LPAE

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Date:	Wed, 25 Jun 2014 13:50:28 -0400
From:	Christopher Covington <cov@...eaurora.org>
To:	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Catalin Marinas <catalin.marinas@....com>
Cc:	Christopher Covington <cov@...eaurora.org>,
	Pawel Moll <Pawel.Moll@....com>, Rob Herring <robh@...nel.org>,
	Stephen Warren <swarren@...dia.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Matthew Leach <matthew.leach@....com>,
	Sudeep KarkadaNagesha <sudeep.karkadanagesha@....com>,
	Nicolas Pitre <nico@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] ARM: virt, vexpress: Use 64-bit DMA for LPAE

On an LPAE system, the physical addresses used by VirtIO-MMIO may be
higher than 32 bits. For example on a Versatile Express system with
4G RAM, the following error surfaces when trying to use a VirtIO-MMIO
block device.

EXT2-fs (vda): error: ext2_check_page: bad entry in directory #2: : unaligned directory entry - offset=0, inode=3755990991, rec_len=57311, name_len=223

To fix this, select ARCH_DMA_ADDR_T_64BIT when LPAE is selected
and mach-vexpress, mach-virt, or both are being built.

Signed-off-by: Christopher Covington <cov@...eaurora.org>
---
 arch/arm/Kconfig               | 1 +
 arch/arm/mach-vexpress/Kconfig | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 245058b..8407c28 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -901,6 +901,7 @@ endmenu
 
 config ARCH_VIRT
 	bool "Dummy Virtual Machine" if ARCH_MULTI_V7
+	select ARCH_DMA_ADDR_T_64BIT if ARM_LPAE
 	select ARM_AMBA
 	select ARM_GIC
 	select ARM_PSCI
diff --git a/arch/arm/mach-vexpress/Kconfig b/arch/arm/mach-vexpress/Kconfig
index 99c1f15..5f33e16 100644
--- a/arch/arm/mach-vexpress/Kconfig
+++ b/arch/arm/mach-vexpress/Kconfig
@@ -1,5 +1,6 @@
 menuconfig ARCH_VEXPRESS
 	bool "ARM Ltd. Versatile Express family" if ARCH_MULTI_V7
+	select ARCH_DMA_ADDR_T_64BIT if ARM_LPAE
 	select ARCH_REQUIRE_GPIOLIB
 	select ARCH_SUPPORTS_BIG_ENDIAN
 	select ARM_AMBA
-- 
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by the Linux Foundation.

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