linux-kernel - Re: [PATCH V3] iommu/amd: Add logic to decode AMD IOMMU event flag

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Message-ID: <20130409094132.GD6858@8bytes.org>
Date:	Tue, 9 Apr 2013 11:41:32 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	suravee.suthikulpanit@....com
Cc:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] iommu/amd: Add logic to decode AMD IOMMU event flag

On Tue, Apr 02, 2013 at 07:06:50PM -0500, Suthikulpanit, Suravee wrote:
> From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> 
> Add logic to decode AMD IOMMU event flag based on information from AMD IOMMU specification.
> This should simplify debugging IOMMU errors.  Also, dump DTE information in additional cases.
> 
> This is an example:
> AMD-Vi: Event logged [IO_PAGE_FAULT device=51:00.0 domain=0x0000 address=0x0000000000000000 flags=0x0fff]
> AMD-Vi: Flags details: Guest NX=1 User Intr Present Write No-Perm Rsrv-Bit Translation
> AMD-Vi: Type of error: (0x7) 
> AMD-Vi: (Note: Please refer to AMD IOMMU specification for details.)
> AMD-Vi: DTE[0]: 6000003fa75e2403
> AMD-Vi: DTE[1]: 0000000000000014
> AMD-Vi: DTE[2]: 2000003fa5e09011
> AMD-Vi: DTE[3]: 0000000000000000

This example should look like this instead:

AMD-Vi: Event logged [IO_PAGE_FAULT device=51:00.0 domain=0x0000 address=0x0 flags: G NX US I P Wr Rsvd Tr]

by default. When the user passes amd_iommu=verbose on the cmd-line then
you can print additional information like "type of error" or the dump
the DTE.


	Joerg


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