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

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Message-ID: <20090214225910.GA1515@colo.lackof.org>
Date:	Sat, 14 Feb 2009 15:59:10 -0700
From:	Grant Grundler <grundler@...isc-linux.org>
To:	Yu Zhao <yu.zhao@...el.com>
Cc:	jbarnes@...tuousgeek.org, dwmw2@...radead.org,
	linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/6] ATS capability support for Intel IOMMU

On Thu, Feb 12, 2009 at 08:50:32PM +0800, Yu Zhao wrote:
> This patch series implements Address Translation Service support for
> the Intel IOMMU. ATS makes the PCI Endpoint be able to request the
> DMA address translation from the IOMMU and cache the translation in
> the Endpoint, thus alleviate IOMMU pressure and improve the hardware
> performance in the I/O virtualization environment.
> 
> 
> Changelog: 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)
> Changelog: v1 -> v2
>   added 'static' prefix to a local LIST_HEAD (Andrew Morton)
> 
> 
> Yu Zhao (6):
>   PCI: support the ATS capability
>   VT-d: parse ATSR in DMA Remapping Reporting Structure
>   VT-d: add queue invalidation fault status support
>   VT-d: add device IOTLB invalidation support
>   VT-d: cleanup iommu_flush_iotlb_psi and flush_unmaps
>   VT-d: support the device IOTLB
> 
>  drivers/pci/dmar.c           |  230 ++++++++++++++++++++++++++++++++++++++----

Yu,
Can you please add something to Documentation/PCI/pci.txt?
New API I'm seeing are:
+extern int pci_enable_ats(struct pci_dev *dev, int ps);
+extern void pci_disable_ats(struct pci_dev *dev);
+extern int pci_ats_queue_depth(struct pci_dev *dev);

Do these also need to be EXPORT_SYMBOL_GPL() as well?
Or are drivers never expected to call the above?

thanks,
grant

>  drivers/pci/intel-iommu.c    |  135 ++++++++++++++++++++-----
>  drivers/pci/intr_remapping.c |   21 ++--
>  drivers/pci/pci.c            |   72 +++++++++++++
>  include/linux/dmar.h         |    9 ++
>  include/linux/intel-iommu.h  |   19 +++-
>  include/linux/pci.h          |   16 +++
>  include/linux/pci_regs.h     |   10 ++
>  8 files changed, 457 insertions(+), 55 deletions(-)
> 
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