[Qemu-devel] [PATCH v2 07/10] raven: add PCI bus mastering address space

[Hervé Poussineau]

This has been tested on Linux 2.4/PPC with the lsi53c895a SCSI adapter.

Signed-off-by: Hervé Poussineau <address@hidden>
---
 hw/pci-host/prep.c |   23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/hw/pci-host/prep.c b/hw/pci-host/prep.c
index bba76af..3baf66f 100644
--- a/hw/pci-host/prep.c
+++ b/hw/pci-host/prep.c
@@ -56,6 +56,10 @@ typedef struct PRePPCIState {
     MemoryRegion pci_io;
     MemoryRegion pci_memory;
     MemoryRegion pci_intack;
+    MemoryRegion bm;
+    MemoryRegion bm_ram_alias;
+    MemoryRegion bm_pci_memory_alias;
+    AddressSpace bm_as;
     RavenPCIState pci_dev;
 } PREPPCIState;
 
@@ -120,6 +124,13 @@ static void prep_set_irq(void *opaque, int irq_num, int 
level)
     qemu_set_irq(pic[irq_num] , level);
 }
 
+static AddressSpace *raven_pcihost_set_iommu(PCIBus *bus, void *opaque,
+                                             int devfn)
+{
+    PREPPCIState *s = opaque;
+    return &s->bm_as;
+}
+
 static void raven_pcihost_realizefn(DeviceState *d, Error **errp)
 {
     SysBusDevice *dev = SYS_BUS_DEVICE(d);
@@ -171,6 +182,18 @@ static void raven_pcihost_initfn(Object *obj)
     pci_bus_new_inplace(&s->pci_bus, DEVICE(obj), NULL,
                         &s->pci_memory, &s->pci_io, 0, TYPE_PCI_BUS);
 
+    /* Bus master address space */
+    memory_region_init(&s->bm, obj, "bm-raven", UINT32_MAX);
+    memory_region_init_alias(&s->bm_pci_memory_alias, obj, "bm-pci-memory",
+                             &s->pci_memory, 0,
+                             memory_region_size(&s->pci_memory));
+    memory_region_init_alias(&s->bm_ram_alias, obj, "bm-system",
+                             get_system_memory(), 0, 0x80000000);
+    memory_region_add_subregion(&s->bm, 0         , &s->bm_pci_memory_alias);
+    memory_region_add_subregion(&s->bm, 0x80000000, &s->bm_ram_alias);
+    address_space_init(&s->bm_as, &s->bm, "raven-bm");
+    pci_setup_iommu(&s->pci_bus, raven_pcihost_set_iommu, s);
+
     h->bus = &s->pci_bus;
 
     object_initialize(&s->pci_dev, TYPE_RAVEN_PCI_DEVICE);
-- 
1.7.10.4