[Qemu-devel] [PATCH v2 1/3] hw/pci: delay bus_master_enable_region initialization

[Marcel Apfelbaum <marcel@redhat.com>]

Skip bus_master_enable region creation on PCI device init
in order to be sure the IOMMU device (if present) would
be created in advance. Add this memory region at machine_done time.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
---
 hw/pci/pci.c             | 46 ++++++++++++++++++++++++++++++++++++----------
 include/hw/pci/pci_bus.h |  2 ++
 2 files changed, 38 insertions(+), 10 deletions(-)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index bb605ef..29dcbcf 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -127,11 +127,44 @@ static void pci_bus_class_init(ObjectClass *klass, void *data)
     pbc->numa_node = pcibus_numa_node;
 }
 
+static void pci_init_bus_master(PCIDevice *pci_dev)
+{
+    AddressSpace *dma_as = pci_device_iommu_address_space(pci_dev);
+
+    memory_region_init_alias(&pci_dev->bus_master_enable_region,
+                             OBJECT(pci_dev), "bus master",
+                             dma_as->root, 0, memory_region_size(dma_as->root));
+    memory_region_set_enabled(&pci_dev->bus_master_enable_region, false);
+    address_space_init(&pci_dev->bus_master_as,
+                       &pci_dev->bus_master_enable_region, pci_dev->name);
+}
+
+static void pcibus_machine_done(Notifier *notifier, void *data)
+{
+    PCIBus *bus = container_of(notifier, PCIBus, machine_done);
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(bus->devices); ++i) {
+        if (bus->devices[i]) {
+            pci_init_bus_master(bus->devices[i]);
+        }
+    }
+}
+
+static void pcibus_initfn(Object *obj)
+{
+    PCIBus *bus = PCI_BUS(obj);
+
+    bus->machine_done.notify = pcibus_machine_done;
+    qemu_add_machine_init_done_notifier(&bus->machine_done);
+}
+
 static const TypeInfo pci_bus_info = {
     .name = TYPE_PCI_BUS,
     .parent = TYPE_BUS,
     .instance_size = sizeof(PCIBus),
     .class_size = sizeof(PCIBusClass),
+    .instance_init = pcibus_initfn,
     .class_init = pci_bus_class_init,
 };
 
@@ -845,7 +878,6 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
     PCIConfigReadFunc *config_read = pc->config_read;
     PCIConfigWriteFunc *config_write = pc->config_write;
     Error *local_err = NULL;
-    AddressSpace *dma_as;
     DeviceState *dev = DEVICE(pci_dev);
 
     pci_dev->bus = bus;
@@ -885,15 +917,9 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
     }
 
     pci_dev->devfn = devfn;
-    dma_as = pci_device_iommu_address_space(pci_dev);
-
-    memory_region_init_alias(&pci_dev->bus_master_enable_region,
-                             OBJECT(pci_dev), "bus master",
-                             dma_as->root, 0, memory_region_size(dma_as->root));
-    memory_region_set_enabled(&pci_dev->bus_master_enable_region, false);
-    address_space_init(&pci_dev->bus_master_as, &pci_dev->bus_master_enable_region,
-                       name);
-
+    if (qdev_hotplug) {
+        pci_init_bus_master(pci_dev);
+    }
     pstrcpy(pci_dev->name, sizeof(pci_dev->name), name);
     pci_dev->irq_state = 0;
     pci_config_alloc(pci_dev);
diff --git a/include/hw/pci/pci_bus.h b/include/hw/pci/pci_bus.h
index 403fec6..5484a9b 100644
--- a/include/hw/pci/pci_bus.h
+++ b/include/hw/pci/pci_bus.h
@@ -39,6 +39,8 @@ struct PCIBus {
        Keep a count of the number of devices with raised IRQs.  */
     int nirq;
     int *irq_count;
+
+    Notifier machine_done;
 };
 
 typedef struct PCIBridgeWindows PCIBridgeWindows;
-- 
2.4.3