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pci: Introduce helper to retrieve a PCI device's DMA address space

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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.

If IOMMU is not set, the pci_device_iommu_address_space() function
returns the parent's IOMMU skipping the "bus master" address space as
otherwise proper emulation would require more effort for no benefit.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
[aik: added inheritance from parent if iommu is not set for the current bus]
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alexey Kardashevskiy 2013-08-10 01:09:08 +10:00 • committed by Michael S. Tsirkin
parent 1ae2757c6c
commit 9eda7d373e
2 changed files with 19 additions and 6 deletions
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1
include/hw/pci/pci.h
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@ -405,6 +405,7 @@ void pci_device_deassert_intx(PCIDevice *dev);
typedef AddressSpace *(*PCIIOMMUFunc)(PCIBus *, void *, int);
AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
void pci_setup_iommu(PCIBus *bus, PCIIOMMUFunc fn, void *opaque);
static inline void