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Date: Wed, 7 Aug 2013 13:27:19 +0300
From: "Michael S. Tsirkin" <mst@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 1/8] pci: Introduce helper to retrieve a
 PCI device's DMA address space
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To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: Anthony Liguori <aliguori@us.ibm.com>, Alexander Graf <agraf@suse.de>, qemu-devel@nongnu.org, Alex Williamson <alex.williamson@redhat.com>, qemu-ppc@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>, Paul Mackerras <paulus@samba.org>, David Gibson <david@gibson.dropbear.id.au>

On Wed, Aug 07, 2013 at 06:21:25PM +1000, Alexey Kardashevskiy wrote:
> From: David Gibson <david@gibson.dropbear.id.au>
> 
> A PCI device's DMA address space (possibly an IOMMU) is returned by a
> method on the PCIBus.  At the moment that only has one caller, so the
> method is simply open coded.  We'll need another caller for VFIO, so
> this patch introduces a helper/wrapper function.
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> ---
>  hw/pci/pci.c         | 9 ++++++++-
>  include/hw/pci/pci.h | 1 +
>  2 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index 4bce3e7..3cea25f 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -813,7 +813,7 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
>  
>      pci_dev->bus = bus;
>      if (bus->iommu_fn) {
> -        dma_as = bus->iommu_fn(bus, bus->iommu_opaque, devfn);
> +        dma_as = pci_iommu_as(pci_dev);
>      } else {
>          /* FIXME: inherit memory region from bus creator */
>          dma_as = &address_space_memory;
> @@ -2248,6 +2248,13 @@ static void pci_device_class_init(ObjectClass *klass, void *data)
>      k->props = pci_props;
>  }
>  
> +AddressSpace *pci_iommu_as(PCIDevice *dev)
> +{
> +    PCIBus *bus = PCI_BUS(dev->bus);
> +
> +    return bus->iommu_fn(bus, bus->iommu_opaque, dev->devfn);
> +}
> +
>  void pci_setup_iommu(PCIBus *bus, PCIIOMMUFunc fn, void *opaque)
>  {
>      bus->iommu_fn = fn;
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index b6ad9e4..614f809 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -407,6 +407,7 @@ void pci_device_deassert_intx(PCIDevice *dev);
>  
>  typedef AddressSpace *(*PCIIOMMUFunc)(PCIBus *, void *, int);
>  
> +AddressSpace *pci_iommu_as(PCIDevice *dev);

I prefer full names, and it needs to mention "device". How about:
	AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);

>  void pci_setup_iommu(PCIBus *bus, PCIIOMMUFunc fn, void *opaque);
>  
>  static inline void
> -- 
> 1.8.3.2