linux-kernel - Re: [PATCH] ARM: Use 64-bit DMA addresses for LPAE+VirtIO-MMIO

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Date:	Fri, 21 Mar 2014 23:27:24 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Christopher Covington <cov@...eaurora.org>
Cc:	Russell King <linux@....linux.org.uk>,
	Jonathan Austin <Jonathan.Austin@....com>,
	Nicolas Pitre <nico@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: Use 64-bit DMA addresses for LPAE+VirtIO-MMIO

On 21 Mar 2014, at 19:44, Christopher Covington <cov@...eaurora.org> wrote:
> On 03/21/2014 12:27 PM, Catalin Marinas wrote:
>> On Wed, Mar 19, 2014 at 05:35:19PM +0000, Christopher Covington wrote:
>>> On an LPAE system, the physical addresses used by VirtIO-MMIO may
>>> be larger than 32 bits, even if the header and configuration space
>>> addresses fit into 32 bits. For example with the Versatile Express
>>> memory map using 4G memory, the following error occured 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 both LPAE and
>>> VIRTIO_MMIO are selected.
>>> 
>>> Signed-off-by: Christopher Covington <cov@...eaurora.org>
>>> ---
>>> arch/arm/mm/Kconfig | 1 +
>>> 1 file changed, 1 insertion(+)
>>> 
>>> diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
>>> index 1f8fed9..a62bcc9 100644
>>> --- a/arch/arm/mm/Kconfig
>>> +++ b/arch/arm/mm/Kconfig
>>> @@ -617,6 +617,7 @@ config ARM_LPAE
>>> 	bool "Support for the Large Physical Address Extension"
>>> 	depends on MMU && CPU_32v7 && !CPU_32v6 && !CPU_32v5 && \
>>> 		!CPU_32v4 && !CPU_32v3
>>> +	select ARCH_DMA_ADDR_T_64BIT if VIRTIO_MMIO
>> 
>> That's the wrong place to enable ARCH_DMA_ADDR_T_64BIT. Do you have a
>> platform with >32-bit physical address space? If yes, it should be
>> selected there.
> 
> The platforms I'm currently using are models like the Versatile Express
> RTSM/FVP. I can respin with changes to ARCH_VEXPRESS and ARCH_VIRT instead.

But do you use RAM beyond 32-bit on such models?

Catalin
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