linux-kernel - Re: skge error; hangs w/ hardware memory hole

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Date:	Tue, 25 Jul 2006 04:35:05 +0200
From:	Andi Kleen <ak@...e.de>
To:	Anthony DeRobertis <asd@...spammers.org>
Cc:	Stephen Hemminger <shemminger@...l.org>,
	Martin Michlmayr <tbm@...ius.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kevin@...experts.com
Subject: Re: skge error; hangs w/ hardware memory hole

On Sunday 23 July 2006 08:32, Anthony DeRobertis wrote:
> Andreas Kleen wrote:
> 
> > 
> > You need to use iommu=soft swiotlb=force
> > 
> > The standard IOMMU is also broken on VIA, but forced swiotlb should
> > work.
> 
> Didn't work :-(

swiotlb=force is unfortunately broken right now. 

But which this patch it should work. Does it?

-Andi

Test patch only: disable DMA over 4GB

Index: linux-2.6.17-work/arch/x86_64/kernel/pci-dma.c
===================================================================
--- linux-2.6.17-work.orig/arch/x86_64/kernel/pci-dma.c
+++ linux-2.6.17-work/arch/x86_64/kernel/pci-dma.c
@@ -202,7 +202,7 @@ int dma_set_mask(struct device *dev, u64
 {
 	if (!dev->dma_mask || !dma_supported(dev, mask))
 		return -EIO;
-	*dev->dma_mask = mask;
+	*dev->dma_mask = mask & 0xffffffff;
 	return 0;
 }
 EXPORT_SYMBOL(dma_set_mask);

-
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