Re: [PATCH]iwlan dma mapping read and write changes

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From: Chris Wright

Subject: Re: [PATCH]iwlan dma mapping read and write changes

Date: Wednesday, February 11, 2009 - 11:59 am

* Fenghua Yu (fenghua.yu@intel.com) wrote:
quoted text> When iwlan runs on IOMMU, IOMMU generates a lot of PTE write faults because PTE
> write bit is not set on some of PTE's. This is because iwlan driver calls DMA
> mapping with PCI_DMA_TODEVICE which is read only in mapping PTE. But iwlan device
> actually writes to the mapped page to update its contents. This issue is not
> exposed in swiotlb. But VT-d hardware can capture this fault and stop the fault
> transaction.
> 
> The following patch fixes the issue.

Yes, plain old driver bug!  This fixes the iwlagn vt-d issue.


quoted text> Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>

Tested-by: Chris Wright <chrisw@sous-sol.org>

thanks,
chris
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Messages in current thread:

[PATCH 0/2]Add Variable Page Size and IA64 Support in Inte ..., Fenghua Yu, (Wed Oct 1, 9:56 am)

Re: [PATCH 0/2]Add Variable Page Size and IA64 Support in ..., Bjorn Helgaas, (Fri Oct 3, 8:50 am)

RE: [PATCH 0/2]Add Variable Page Size and IA64 Support in ..., Yu, Fenghua, (Mon Oct 6, 12:44 pm)

[PATCH V2 0/2] Add Variable Page Size and IA64 Support in ..., Fenghua Yu, (Mon Oct 6, 5:01 pm)

[PATCH]iwlan dma mapping read and write changes, Fenghua Yu, (Wed Feb 11, 11:26 am)

RE: [PATCH]iwlan dma mapping read and write changes, Bhavesh Davda, (Wed Feb 11, 11:35 am)

Re: [PATCH]iwlan dma mapping read and write changes, Chris Wright, (Wed Feb 11, 11:59 am)

RE: [PATCH]iwlan dma mapping read and write changes, Yu, Fenghua, (Wed Feb 11, 12:29 pm)

RE: [PATCH]iwlan dma mapping read and write changes, Winkler, Tomas, (Wed Feb 11, 2:27 pm)

RE: [PATCH]iwlan dma mapping read and write changes, Johannes Berg, (Wed Feb 11, 2:33 pm)

RE: [PATCH]iwlan dma mapping read and write changes, Winkler, Tomas, (Wed Feb 11, 2:41 pm)

RE: [PATCH]iwlan dma mapping read and write changes, Johannes Berg, (Wed Feb 11, 2:47 pm)

RE: [PATCH]iwlan dma mapping read and write changes, Johannes Berg, (Wed Feb 11, 2:50 pm)

RE: [PATCH]iwlan dma mapping read and write changes, Winkler, Tomas, (Wed Feb 11, 3:10 pm)

RE: [PATCH]iwlan dma mapping read and write changes, Yu, Fenghua, (Wed Feb 11, 3:13 pm)

RE: [PATCH]iwlan dma mapping read and write changes, David Woodhouse, (Wed Feb 11, 3:13 pm)

RE: [PATCH]iwlan dma mapping read and write changes, Winkler, Tomas, (Thu Feb 12, 6:42 am)


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