linux-kernel - Re: [PATCH V4] IOMMU, AMD Family15h Model10-1Fh erratum 746 Workaround

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Date:	Thu, 24 Jan 2013 21:00:34 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	suravee.suthikulpanit@....com
Cc:	iommu@...ts.linux-foundation.org, joro@...tes.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4] IOMMU, AMD Family15h Model10-1Fh erratum 746
 Workaround

On Thu, Jan 24, 2013 at 01:17:53PM -0600, suravee.suthikulpanit@....com wrote:
> From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> 
> The IOMMU may stop processing page translations due to a perceived lack
> of credits for writing upstream peripheral page service request (PPR)
> or event logs. If the L2B miscellaneous clock gating feature is enabled
> the IOMMU does not properly register credits after the log request has
> completed, leading to a potential system hang.
> 
> BIOSes are supposed to disable L2B micellaneous clock gating by setting
> L2_L2B_CK_GATE_CONTROL[CKGateL2BMiscDisable](D0F2xF4_x90[2]) = 1b. This
> patch corrects that for those which do not enable this workaround.
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>

Acked-by: Borislav Petkov <bp@...e.de>

Thanks for the good work.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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