[SeaBIOS] [PATCH 02/13] pci: add IOMMU support via the generic DMA layer

[Eduard - Gabriel Munteanu]

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

Signed-off-by: Eduard - Gabriel Munteanu 
---
 hw/pci.c           |    7 +++++++
 hw/pci.h           |    7 +++++++
 hw/pci_internals.h |    1 +
 3 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/hw/pci.c b/hw/pci.c
index 612ccaa..0a32a93 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -738,6 +738,7 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
         return NULL;
     }
     pci_dev->bus = bus;
+    pci_dev->dma.mmu = &bus->mmu;
     pci_dev->devfn = devfn;
     pstrcpy(pci_dev->name, sizeof(pci_dev->name), name);
     pci_dev->irq_state = 0;
@@ -2163,3 +2164,9 @@ int pci_qdev_find_device(const char *id, PCIDevice **pdev)

return rc;
 }
+
+void pci_register_iommu(PCIDevice *dev, DMATranslateFunc *translate)
+{
+    dev->bus->mmu.iommu = &dev->qdev;
+    dev->bus->mmu.translate = translate;    
+}
diff --git a/hw/pci.h b/hw/pci.h
index 550531b..4bb0a94 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"
@@ -128,6 +129,10 @@ enum {

struct PCIDevice {
     DeviceState qdev;
+
+    /* For devices which do DMA. */
+    DMADevice dma;
+
     /* PCI config space */
     uint8_t *config;

@@ -267,6 +272,8 @@ void pci_bridge_update_mappings(PCIBus *b);

void pci_device_deassert_intx(PCIDevice *dev);

+void pci_register_iommu(PCIDevice *dev, DMATranslateFunc *translate);
+
 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..6452e8c 100644
--- a/hw/pci_internals.h
+++ b/hw/pci_internals.h
@@ -16,6 +16,7 @@ extern struct BusInfo pci_bus_info;

struct PCIBus {
     BusState qbus;
+    DMAMmu mmu;
     uint8_t devfn_min;
     pci_set_irq_fn set_irq;
     pci_map_irq_fn map_irq;