tree 79b9f450dd31dc5ab348b4620ea2852d993181ab
parent 1ae2757c6c4525c9b42f408c86818f843bad7418
author Alexey Kardashevskiy <aik@ozlabs.ru> 1376060948 +1000
committer Michael S. Tsirkin <mst@redhat.com> 1377581448 +0300

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

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>