linux-kernel - Re: [PATCH v3 0/6] ATS capability support for Intel IOMMU

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Message-ID: <20090323052208.GA1803@yzhao-otc.sh.intel.com>
Date:	Mon, 23 Mar 2009 13:22:08 +0800
From:	Yu Zhao <yu.zhao@...el.com>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/6] ATS capability support for Intel IOMMU

On Fri, Mar 20, 2009 at 07:15:51PM +0800, David Woodhouse wrote:
> On Fri, 2009-03-20 at 10:47 +0800, Zhao, Yu wrote:
> > If it's possible, I'd like it go through the PCI tree because the ATS 
> > depends on the SR-IOV. This dependency is not reflected in this v3 
> > series since the SR-IOV is not in-tree and I don't want to break the 
> > build after people apply the ATS on their tree.
> 
> In what way will it depend on SR-IOV?

The SR-IOV spec section 3.7.4 says that the Smallest Translation Unit and
the Invalidate Queue Depth fields in the Virtual Function's ATS capability
are hard-wired to 0. So we need some special handling when enabling the ATS
capability for the Virtual Function.

                  Table 3-26: ATS Capability Register
-------------+-----------------------------------------+---------------+--------------
Bit Location | PF and VF Register Differences From ATS | PF Attributes | VF Attributes
-------------+-----------------------------------------+---------------+--------------
             |    Smallest Translation Unit (STU)      |               |
   20:16     |    Hardwired to 0 for VFs.              |      ATS      |      RO
             |    PF value applies to all VFs.         |               |
-------------+-----------------------------------------+---------------+--------------
             |    Invalidate Queue Depth               |               |
   28:24     |    Hardwired to 0 for VFs.              |      ATS      |      RO
             |    Depth of shared PF input queue.      |               |
-------------+-----------------------------------------+---------------+--------------

> > So Dave, can I get an ack from you and let Jesse pull the IOMMU change
> > to his tree? Or let this ATS go to 2.6.31?
> 
> Want to show the latest version of the patches which depend on SR-IOV,
> and I can ack them?

Sure, thanks!
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