diff options
Diffstat (limited to 'hw/pci_bridge.c')
| -rw-r--r-- | hw/pci_bridge.c | 85 |
1 files changed, 82 insertions, 3 deletions
diff --git a/hw/pci_bridge.c b/hw/pci_bridge.c index 464d89708f..b6287cdc6d 100644 --- a/hw/pci_bridge.c +++ b/hw/pci_bridge.c @@ -135,6 +135,76 @@ pcibus_t pci_bridge_get_limit(const PCIDevice *bridge, uint8_t type) return limit; } +static void pci_bridge_init_alias(PCIBridge *bridge, MemoryRegion *alias, + uint8_t type, const char *name, + MemoryRegion *space, + MemoryRegion *parent_space, + bool enabled) +{ + pcibus_t base = pci_bridge_get_base(&bridge->dev, type); + pcibus_t limit = pci_bridge_get_limit(&bridge->dev, type); + /* TODO: this doesn't handle base = 0 limit = 2^64 - 1 correctly. + * Apparently no way to do this with existing memory APIs. */ + pcibus_t size = enabled && limit >= base ? limit + 1 - base : 0; + + memory_region_init_alias(alias, name, space, base, size); + 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) +{ + PCIBus *parent = br->dev.bus; + uint16_t cmd = pci_get_word(br->dev.config + PCI_COMMAND); + + pci_bridge_init_alias(br, &br->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_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_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. */ +} + +static void pci_bridge_region_cleanup(PCIBridge *br) +{ + 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); +} + +static void pci_bridge_update_mappings(PCIBridge *br) +{ + /* 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); + memory_region_transaction_commit(); +} + /* default write_config function for PCI-to-PCI bridge */ void pci_bridge_write_config(PCIDevice *d, uint32_t address, uint32_t val, int len) @@ -145,13 +215,15 @@ void pci_bridge_write_config(PCIDevice *d, pci_default_write_config(d, address, val, len); - if (/* io base/limit */ + if (ranges_overlap(address, len, PCI_COMMAND, 2) || + + /* io base/limit */ ranges_overlap(address, len, PCI_IO_BASE, 2) || /* memory base/limit, prefetchable base/limit and io base/limit upper 16 */ ranges_overlap(address, len, PCI_MEMORY_BASE, 20)) { - pci_bridge_update_mappings(&s->sec_bus); + pci_bridge_update_mappings(s); } newctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL); @@ -246,7 +318,11 @@ int pci_bridge_initfn(PCIDevice *dev) br->bus_name); sec_bus->parent_dev = dev; sec_bus->map_irq = br->map_irq; - + sec_bus->address_space_mem = &br->address_space_mem; + memory_region_init(&br->address_space_mem, "pci_pridge_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); QLIST_INIT(&sec_bus->child); QLIST_INSERT_HEAD(&parent->child, sec_bus, sibling); return 0; @@ -258,6 +334,9 @@ int 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); + memory_region_destroy(&s->address_space_mem); + memory_region_destroy(&s->address_space_io); /* qbus_free() is called automatically by qdev_free() */ return 0; } |