[Qemu-ppc] [PATCH 1/8] pci: Introduce helper to retrieve a PCI device's DMA address space

[Alexey Kardashevskiy]

From: David Gibson <address@hidden>

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