linux-kernel - Re: [PATCH 4/6] pci/dmar/sriov: use physfn to search drhd for VF

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Date:	Fri, 9 Apr 2010 08:54:46 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Yinghai <yinghai.lu@...cle.com>
Cc:	Chris Wright <chrisw@...s-sol.org>,
	Roland Dreier <rdreier@...co.com>, David.Woodhouse@...el.com,
	fenghua.yu@...el.com, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 4/6] pci/dmar/sriov: use physfn to search drhd for VF

On Thu, 08 Apr 2010 17:07:55 -0700
Yinghai <yinghai.lu@...cle.com> wrote:

> On 04/08/2010 04:24 PM, Chris Wright wrote:
> > * Yinghai (yinghai.lu@...cle.com) wrote:
> >> --- linux-2.6.orig/drivers/pci/dmar.c
> >> +++ linux-2.6/drivers/pci/dmar.c
> >> @@ -534,6 +534,8 @@ dmar_find_matched_drhd_unit(struct pci_d
> >>  	struct dmar_drhd_unit *dmaru = NULL;
> >>  	struct acpi_dmar_hardware_unit *drhd;
> >>  
> >> +	dev = pci_physfn(dev);
> >> +
> > 
> > Yeah, we typically don't have enough VF's to wrap bus numbers, or we're
> > under a catchall IOMMU.  In the catchall case both vf->bus and vf->pf->bus
> > will have the same domain (segment) regardless of whether we have large
> > VF count or big offset/stride.  So, I suppose this could be done inside
> > of dmar_pci_device_match().
> > 
> > Otherwise, I think you'd want to add the same thing to
> > dmar_find_matched_atsr_unit() since it's the same device scopes there.
> 
> please check
> 
> Subject: [PATCH] pci/dmar/sriov: use physfn to search drhd for VF
> 
> When virtfn is used, we should use physfn to find correct drhd
> 
> -v2: add pci_physfn() Suggested by Roland Dreier <rdreier@...co.com>
>      do can remove ifdef in dmar.c
> -v3: Chris pointed out we need that for dma_find_matched_atsr_unit too
>      also change dmar_pci_device_match() static
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Acked-by: Roland Dreier <rdreier@...co.com>

This one looks good:

Acked-by: Jesse Barnes <jbarnes@...tuousgeek.org>

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