[Qemu-devel] [PATCH 02/14] pci: add IOMMU support via the generic DMA layer

[David Gibson <david@gibson.dropbear.id.au>]

IOMMUs can now be hooked onto the PCI bus. This makes use of the generic
DMA layer.

Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/pci.c           |    9 +++++++++
 hw/pci.h           |    5 +++++
 hw/pci_internals.h |    7 +++++++
 3 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/hw/pci.c b/hw/pci.c
index 1d297d6..03ec453 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -745,6 +745,10 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
         return NULL;
     }
     pci_dev->bus = bus;
+#ifdef CONFIG_IOMMU
+    if (bus->iommu)
+        pci_dev->qdev.iommu = bus->iommu->new_device(bus);
+#endif
     pci_dev->devfn = devfn;
     pstrcpy(pci_dev->name, sizeof(pci_dev->name), name);
     pci_dev->irq_state = 0;
@@ -2163,3 +2167,8 @@ int pci_qdev_find_device(const char *id, PCIDevice **pdev)
 
     return rc;
 }
+
+void pci_register_iommu(PCIBus *bus, PCIBusIOMMU *iommu)
+{
+    bus->iommu = iommu;
+}
diff --git a/hw/pci.h b/hw/pci.h
index 0d288ce..a71ba04 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -5,6 +5,7 @@
 #include "qobject.h"
 
 #include "qdev.h"
+#include "dma_rw.h"
 
 /* PCI includes legacy ISA access.  */
 #include "isa.h"
@@ -129,6 +130,7 @@ enum {
 
 struct PCIDevice {
     DeviceState qdev;
+
     /* PCI config space */
     uint8_t *config;
 
@@ -271,6 +273,9 @@ void pci_bridge_update_mappings(PCIBus *b);
 
 void pci_device_deassert_intx(PCIDevice *dev);
 
+typedef struct PCIBusIOMMU PCIBusIOMMU;
+void pci_register_iommu(PCIBus *bus, PCIBusIOMMU *iommu);
+
 static inline void
 pci_set_byte(uint8_t *config, uint8_t val)
 {
diff --git a/hw/pci_internals.h b/hw/pci_internals.h
index fbe1866..ff1a640 100644
--- a/hw/pci_internals.h
+++ b/hw/pci_internals.h
@@ -14,8 +14,15 @@
 
 extern struct BusInfo pci_bus_info;
 
+typedef DMAMmu *(*pci_iommu_new_device_fn)(PCIBus *);
+
+struct PCIBusIOMMU {
+    pci_iommu_new_device_fn new_device;
+};
+
 struct PCIBus {
     BusState qbus;
+    PCIBusIOMMU *iommu;
     uint8_t devfn_min;
     pci_set_irq_fn set_irq;
     pci_map_irq_fn map_irq;
-- 
1.7.4.4