linux-kernel - Re: [PATCH V2] iommu/amd: Fix logic to determine and checking max PASID

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Message-ID: <20140324154806.GB2775@8bytes.org>
Date:	Mon, 24 Mar 2014 16:48:06 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	suravee.suthikulpanit@....com
Cc:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	kim.naru@....com, jay.cornwall@....com
Subject: Re: [PATCH V2] iommu/amd: Fix logic to determine and checking max
 PASID

On Wed, Mar 05, 2014 at 06:54:18PM -0600, suravee.suthikulpanit@....com wrote:
> From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> 
> In reality, the spec can only support 16-bit PASID since
> INVALIDATE_IOTLB_PAGES and COMPLETE_PPR_REQUEST commands only allow 16-bit
> PASID. So, we updated the PASID_MASK accordingly and invoke BUG_ON
> if the hardware is reporting PASmax more than 16-bit.
> 
> Besides, max PASID is defined as ((2^(PASmax+1)) - 1). The current does not
> determine this correctly.
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> Tested-by: Jay Cornwall <Jay.Cornwall@....com>

Applied, thanks.

Btw, is there any publicly available driver/way/whatever for me to test the
AMD IOMMUv2 code paths?


	Joerg


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