linux-kernel - Re: [PATCH 1/1] iommu/amd: Fix PASID format in INVALIDATE_IOTLB

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Message-ID: <5316051E.2030004@amd.com>
Date:	Tue, 4 Mar 2014 10:53:50 -0600
From:	Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:	Joerg Roedel <joro@...tes.org>
CC:	<iommu@...ts.linux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jay Cornwall <jay.cornwall@....com>,
	"Naru, Kim" <Kim.Naru@....com>
Subject: Re: [PATCH 1/1] iommu/amd: Fix PASID format in INVALIDATE_IOTLB_PAGES
 command

On 3/4/2014 8:12 AM, Joerg Roedel wrote:
> On Wed, Feb 26, 2014 at 03:49:31PM -0600, suravee.suthikulpanit@....com wrote:
>> From: Jay Cornwall <jay.cornwall@....com>
>>
>> This patch corrects the PASID format in the INVALIDATE_IOTLB_PAGES
>> command, which was caused by incorrect information in
>> the AMD IOMMU Architectural Specification v2.01 document.
>>
>>      Incorrect format:
>>           cmd->data[0][16:23] = PASID[7:0]
>>           cmd->data[1][16:27] = PASID[19:8]
>>
>>       Correct format:
>>           cmd->data[0][16:23] = PASID[15:8]
>>           cmd->data[1][16:23] = PASID[7:0]
>>
>> However, this does not affect the IOMMUv2 hardware implementation,
>> and has been corrected since version 2.02 of the specification
>> (available through AMD NDA).
>>
>> Signed-off-by: Jay Cornwall <jay.cornwall@....com>
>> Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
>
> Applied, thanks.
>
> Does this mean that PASIDs are only 16 bits wide now from the former 20
> bits?
>
>
>

Thank you Joerg. The specification also state that this command format 
does not support the maximum size of the PASID field. However, other 
commands seem to still support 20-bit PASID.

Suravee

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