linux-kernel - Re: [PATCH 1/1] iommu: add a dma remap fault reason.

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Date:	Thu, 07 Mar 2013 13:31:05 -0500
From:	Don Dutile <ddutile@...hat.com>
To:	"Li, Zhen-Hua" <zhen-hual@...com>, iommu@...ts.linux-foundation.org
CC:	linux-kernel@...r.kernel.org, Joerg Roedel <joro@...tes.org>,
	Ingo Molnar <mingo@...nel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Hannes Reinecke <hare@...e.de>
Subject: Re: [PATCH 1/1] iommu: add a dma remap fault reason.

cc-ing the upstream iommu-list

On 03/05/2013 09:43 PM, Li, Zhen-Hua wrote:
> The number of dma fault reasons in intel's document are from 1 to 0xD, but in dmar.c I cannot find fault reason 0xD.
>
> In this document:
> Intel Virtualization Technology for Directed I/O Architecture Specification
> http://download.intel.com/technology/computing/vptech/Intel(r)_VT_for_Direct_IO.pdf
>
> Chapter 4. Support For Device-IOTLBs
>
> Table 6. Unsuccessful Translated Requests
>
> There is fault reason for 0xD not listed in kernel:
>      Present context-entry used to process translation request
>      specifies blocking of Translation Requests (Translation Type (T)
>      field value not equal to 01b).
>
> So I think 0xD should be added.
>
> Signed-off-by: Li, Zhen-Hua<zhen-hual@...com>
> ---
>   drivers/iommu/dmar.c |    1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
> index dc7e478..e5cdaf8 100644
> --- a/drivers/iommu/dmar.c
> +++ b/drivers/iommu/dmar.c
> @@ -1083,6 +1083,7 @@ static const char *dma_remap_fault_reasons[] =
>   	"non-zero reserved fields in RTP",
>   	"non-zero reserved fields in CTP",
>   	"non-zero reserved fields in PTE",
> +	"PCE for translation request specifies blocking",
>   };
>
>   static const char *irq_remap_fault_reasons[] =

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