linux-kernel - Re: [PATCH v4 0/6] PCI: support the ATS capability

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Date:	Thu, 26 Mar 2009 16:15:56 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Yu Zhao <yu.zhao@...el.com>
Cc:	dwmw2@...radead.org, linux-pci@...r.kernel.org,
	iommu@...ts.linux-foundation.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Yu Zhao <yu.zhao@...el.com>
Subject: Re: [PATCH v4 0/6] PCI: support the ATS capability

On Mon, 23 Mar 2009 15:58:56 +0800
Yu Zhao <yu.zhao@...el.com> wrote:

> This patch series implements Address Translation Service support for
> the Intel IOMMU. The PCIe Endpoint that supports ATS capability can
> request the DMA address translation from the IOMMU and cache the
> translation itself. This can alleviate IOMMU TLB pressure and improve
> the hardware performance in the I/O virtualization environment.
> 
> The ATS is one of PCI-SIG I/O Virtualization (IOV) Specifications. The
> spec can be found at: http://www.pcisig.com/specifications/iov/ats/
> (it requires membership).
> 
> 
> Changelog:
> v3 -> v4
>   1, coding style fixes (Grant Grundler)
>   2, support the Virtual Function ATS capability
> 
> v2 -> v3
>   1, throw error message if VT-d hardware detects invalid descriptor
>      on Queued Invalidation interface (David Woodhouse)
>   2, avoid using pci_find_ext_capability every time when reading ATS
>      Invalidate Queue Depth (Matthew Wilcox)
> 
> v1 -> v2
>   added 'static' prefix to a local LIST_HEAD (Andrew Morton)

This is a good sized chunk of new code, and you want it to come through
the PCI tree, right?  It looks like it's seen some review from Grant,
David and Matthew but I don't see any Reviewed-by or Acked-by tags in
there... Anyone willing to provide those?

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center
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