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From: Chris Wright <chrisw@sous-sol.org>
To: Fenghua Yu <fenghua.yu@intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>,
	Ingo Molnar <mingo@elte.hu>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Andrew Morton <akpm@linux-foundation.sc.intel.com>,
	Johannes Berg <johannes@sipsolutions.net>,
	Emmanuel Grumbach <emmanuel.grumbach@intel.com>,
	Tomas Winkler <tomas.winkler@intel.com>,
	Zhu Yi <yi.zhu@intel.com>, Chris Wright <chrisw@sous-sol.org>,
	LKML <linux-kernel@vger.kernel.org>,
	iommu@lists.linux-foundation.org
Subject: Re: [PATCH]iwlan dma mapping read and write changes
Date: Wed, 11 Feb 2009 10:59:45 -0800	[thread overview]
Message-ID: <20090211185945.GQ27684@sequoia.sous-sol.org> (raw)
In-Reply-To: <20090211182648.GA1661@linux-os.sc.intel.com>

* Fenghua Yu (fenghua.yu@intel.com) wrote:
> 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.


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

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

thanks,
chris

  parent reply	other threads:[~2009-02-11 19:03 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-01 16:56 [PATCH 0/2]Add Variable Page Size and IA64 Support in Intel IOMMU Fenghua Yu
2008-10-03 15:50 ` Bjorn Helgaas
2008-10-06 19:44   ` Yu, Fenghua
2008-10-07  0:01 ` [PATCH V2 0/2] Add " Fenghua Yu
2009-02-11 18:26 ` [PATCH]iwlan dma mapping read and write changes Fenghua Yu
2009-02-11 18:35   ` Bhavesh Davda
2009-02-11 19:29     ` Yu, Fenghua
2009-02-11 18:59   ` Chris Wright [this message]
2009-02-11 21:27   ` Winkler, Tomas
2009-02-11 21:33     ` Johannes Berg
2009-02-11 21:41       ` Winkler, Tomas
2009-02-11 21:47         ` Johannes Berg
2009-02-11 21:50           ` Johannes Berg
2009-02-11 22:10             ` Winkler, Tomas
2009-02-11 22:13               ` Yu, Fenghua
2009-02-11 22:13               ` David Woodhouse
2009-02-12 13:42                 ` Winkler, Tomas

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