diff options
Diffstat (limited to 'hw/pci_bridge.c')
| -rw-r--r-- | hw/pci_bridge.c | 50 |
1 files changed, 28 insertions, 22 deletions
diff --git a/hw/pci_bridge.c b/hw/pci_bridge.c index 5c6455f6f..4680501e4 100644 --- a/hw/pci_bridge.c +++ b/hw/pci_bridge.c @@ -151,58 +151,63 @@ static void pci_bridge_init_alias(PCIBridge *bridge, MemoryRegion *alias, memory_region_add_subregion_overlap(parent_space, base, alias, 1); } -static void pci_bridge_cleanup_alias(MemoryRegion *alias, - MemoryRegion *parent_space) -{ - memory_region_del_subregion(parent_space, alias); - memory_region_destroy(alias); -} - -static void pci_bridge_region_init(PCIBridge *br) +static PCIBridgeWindows *pci_bridge_region_init(PCIBridge *br) { PCIBus *parent = br->dev.bus; + PCIBridgeWindows *w = g_new(PCIBridgeWindows, 1); uint16_t cmd = pci_get_word(br->dev.config + PCI_COMMAND); - pci_bridge_init_alias(br, &br->alias_pref_mem, + pci_bridge_init_alias(br, &w->alias_pref_mem, PCI_BASE_ADDRESS_MEM_PREFETCH, "pci_bridge_pref_mem", &br->address_space_mem, parent->address_space_mem, cmd & PCI_COMMAND_MEMORY); - pci_bridge_init_alias(br, &br->alias_mem, + pci_bridge_init_alias(br, &w->alias_mem, PCI_BASE_ADDRESS_SPACE_MEMORY, "pci_bridge_mem", &br->address_space_mem, parent->address_space_mem, cmd & PCI_COMMAND_MEMORY); - pci_bridge_init_alias(br, &br->alias_io, + pci_bridge_init_alias(br, &w->alias_io, PCI_BASE_ADDRESS_SPACE_IO, "pci_bridge_io", &br->address_space_io, parent->address_space_io, cmd & PCI_COMMAND_IO); /* TODO: optinal VGA and VGA palette snooping support. */ + + return w; } -static void pci_bridge_region_cleanup(PCIBridge *br) +static void pci_bridge_region_del(PCIBridge *br, PCIBridgeWindows *w) { PCIBus *parent = br->dev.bus; - pci_bridge_cleanup_alias(&br->alias_io, - parent->address_space_io); - pci_bridge_cleanup_alias(&br->alias_mem, - parent->address_space_mem); - pci_bridge_cleanup_alias(&br->alias_pref_mem, - parent->address_space_mem); + + memory_region_del_subregion(parent->address_space_io, &w->alias_io); + memory_region_del_subregion(parent->address_space_mem, &w->alias_mem); + memory_region_del_subregion(parent->address_space_mem, &w->alias_pref_mem); +} + +static void pci_bridge_region_cleanup(PCIBridge *br, PCIBridgeWindows *w) +{ + memory_region_destroy(&w->alias_io); + memory_region_destroy(&w->alias_mem); + memory_region_destroy(&w->alias_pref_mem); + g_free(w); } static void pci_bridge_update_mappings(PCIBridge *br) { + PCIBridgeWindows *w = br->windows; + /* Make updates atomic to: handle the case of one VCPU updating the bridge * while another accesses an unaffected region. */ memory_region_transaction_begin(); - pci_bridge_region_cleanup(br); - pci_bridge_region_init(br); + pci_bridge_region_del(br, br->windows); + br->windows = pci_bridge_region_init(br); memory_region_transaction_commit(); + pci_bridge_region_cleanup(br, w); } /* default write_config function for PCI-to-PCI bridge */ @@ -326,7 +331,7 @@ int pci_bridge_initfn(PCIDevice *dev) memory_region_init(&br->address_space_mem, "pci_bridge_pci", INT64_MAX); sec_bus->address_space_io = &br->address_space_io; memory_region_init(&br->address_space_io, "pci_bridge_io", 65536); - pci_bridge_region_init(br); + br->windows = pci_bridge_region_init(br); QLIST_INIT(&sec_bus->child); QLIST_INSERT_HEAD(&parent->child, sec_bus, sibling); return 0; @@ -338,7 +343,8 @@ void pci_bridge_exitfn(PCIDevice *pci_dev) PCIBridge *s = DO_UPCAST(PCIBridge, dev, pci_dev); assert(QLIST_EMPTY(&s->sec_bus.child)); QLIST_REMOVE(&s->sec_bus, sibling); - pci_bridge_region_cleanup(s); + pci_bridge_region_del(s, s->windows); + pci_bridge_region_cleanup(s, s->windows); memory_region_destroy(&s->address_space_mem); memory_region_destroy(&s->address_space_io); /* qbus_free() is called automatically by qdev_free() */ |