linux-kernel - Re: [PATCH V2] iommu/amd - Set the device table entry PPR bit for IOMMU V2 devices

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Message-ID: <20171220120251.435ed475@t450s.home>
Date:   Wed, 20 Dec 2017 12:02:51 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Gary R Hook <gary.hook@....com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] iommu/amd - Set the device table entry PPR bit for
 IOMMU V2 devices

On Tue, 19 Dec 2017 16:15:41 -0600
Gary R Hook <gary.hook@....com> wrote:

> The AMD IOMMU specification Rev 3.00 (December 2016) introduces a
> new Enhanced PPR Handling Support (EPHSup) bit in the MMIO register
> offset 0030h (IOMMU Extended Feature Register).
> 
> When EPHSup=1, the IOMMU hardware requires the PPR bit of the
> device table entry (DTE) to be set in order to support PPR for a
> particular endpoint device.
> 
> Please see https://support.amd.com/TechDocs/48882_IOMMU.pdf for
> this revision of the AMD IOMMU specification.
> 
> Signed-off-by: Gary R Hook <gary.hook@....com>
> ---
>  0 files changed

Hmm, something funky there, but looks fine otherwise.  Applied to
v4.16-iommu/amd.  Thanks,

Alex