/* * QEMU PCI bus manager * * Copyright (c) 2004 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to dea * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ /* * split out from pci.c * Copyright (c) 2010 Isaku Yamahata * VA Linux Systems Japan K.K. */ #include "hw/pci/pci_bridge.h" #include "hw/pci/pci_bus.h" #include "qemu/range.h" /* PCI bridge subsystem vendor ID helper functions */ #define PCI_SSVID_SIZEOF 8 #define PCI_SSVID_SVID 4 #define PCI_SSVID_SSID 6 int pci_bridge_ssvid_init(PCIDevice *dev, uint8_t offset, uint16_t svid, uint16_t ssid) { int pos; pos = pci_add_capability(dev, PCI_CAP_ID_SSVID, offset, PCI_SSVID_SIZEOF); if (pos < 0) { return pos; } pci_set_word(dev->config + pos + PCI_SSVID_SVID, svid); pci_set_word(dev->config + pos + PCI_SSVID_SSID, ssid); return pos; } /* Accessor function to get parent bridge device from pci bus. */ PCIDevice *pci_bridge_get_device(PCIBus *bus) { return bus->parent_dev; } /* Accessor function to get secondary bus from pci-to-pci bridge device */ PCIBus *pci_bridge_get_sec_bus(PCIBridge *br) { return &br->sec_bus; } static uint32_t pci_config_get_io_base(const PCIDevice *d, uint32_t base, uint32_t base_upper16) { uint32_t val; val = ((uint32_t)d->config[base] & PCI_IO_RANGE_MASK) << 8; if (d->config[base] & PCI_IO_RANGE_TYPE_32) { val |= (uint32_t)pci_get_word(d->config + base_upper16) << 16; } return val; } static pcibus_t pci_config_get_memory_base(const PCIDevice *d, uint32_t base) { return ((pcibus_t)pci_get_word(d->config + base) & PCI_MEMORY_RANGE_MASK) << 16; } static pcibus_t pci_config_get_pref_base(const PCIDevice *d, uint32_t base, uint32_t upper) { pcibus_t tmp; pcibus_t val; tmp = (pcibus_t)pci_get_word(d->config + base); val = (tmp & PCI_PREF_RANGE_MASK) << 16; if (tmp & PCI_PREF_RANGE_TYPE_64) { val |= (pcibus_t)pci_get_long(d->config + upper) << 32; } return val; } /* accessor function to get bridge filtering base address */ pcibus_t pci_bridge_get_base(const PCIDevice *bridge, uint8_t type) { pcibus_t base; if (type & PCI_BASE_ADDRESS_SPACE_IO) { base = pci_config_get_io_base(bridge, PCI_IO_BASE, PCI_IO_BASE_UPPER16); } else { if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) { base = pci_config_get_pref_base( bridge, PCI_PREF_MEMORY_BASE, PCI_PREF_BASE_UPPER32); } else { base = pci_config_get_memory_base(bridge, PCI_MEMORY_BASE); } } return base; } /* accessor funciton to get bridge filtering limit */ pcibus_t pci_bridge_get_limit(const PCIDevice *bridge, uint8_t type) { pcibus_t limit; if (type & PCI_BASE_ADDRESS_SPACE_IO) { limit = pci_config_get_io_base(bridge, PCI_IO_LIMIT, PCI_IO_LIMIT_UPPER16); limit |= 0xfff; /* PCI bridge spec 3.2.5.6. */ } else { if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) { limit = pci_config_get_pref_base( bridge, PCI_PREF_MEMORY_LIMIT, PCI_PREF_LIMIT_UPPER32); } else { limit = pci_config_get_memory_base(bridge, PCI_MEMORY_LIMIT); } limit |= 0xfffff; /* PCI bridge spec 3.2.5.{1, 8}. */ } 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 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, &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, &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, &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_del(PCIBridge *br, PCIBridgeWindows *w) { PCIBus *parent = br->dev.bus; 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_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 */ void pci_bridge_write_config(PCIDevice *d, uint32_t address, uint32_t val, int len) { PCIBridge *s = container_of(d, PCIBridge, dev); uint16_t oldctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL); uint16_t newctl; pci_default_write_config(d, address, val, len); 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); } newctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL); if (~oldctl & newctl & PCI_BRIDGE_CTL_BUS_RESET) { /* Trigger hot reset on 0->1 transition. */ pci_bus_reset(&s->sec_bus); } } void pci_bridge_disable_base_limit(PCIDevice *dev) { uint8_t *conf = dev->config; pci_byte_test_and_set_mask(conf + PCI_IO_BASE, PCI_IO_RANGE_MASK & 0xff); pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT, PCI_IO_RANGE_MASK & 0xff); pci_word_test_and_set_mask(conf + PCI_MEMORY_BASE, PCI_MEMORY_RANGE_MASK & 0xffff); pci_word_test_and_clear_mask(conf + PCI_MEMORY_LIMIT, PCI_MEMORY_RANGE_MASK & 0xffff); pci_word_test_and_set_mask(conf + PCI_PREF_MEMORY_BASE, PCI_PREF_RANGE_MASK & 0xffff); pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_LIMIT, PCI_PREF_RANGE_MASK & 0xffff); pci_set_long(conf + PCI_PREF_BASE_UPPER32, 0); pci_set_long(conf + PCI_PREF_LIMIT_UPPER32, 0); } /* reset bridge specific configuration registers */ void pci_bridge_reset(DeviceState *qdev) { PCIDevice *dev = PCI_DEVICE(qdev); uint8_t *conf = dev->config; conf[PCI_PRIMARY_BUS] = 0; conf[PCI_SECONDARY_BUS] = 0; conf[PCI_SUBORDINATE_BUS] = 0; conf[PCI_SEC_LATENCY_TIMER] = 0; /* * the default values for base/limit registers aren't specified * in the PCI-to-PCI-bridge spec. So we don't thouch them here. * Each implementation can override it. * typical implementation does * zero base/limit registers or * disable forwarding: pci_bridge_disable_base_limit() * If disable forwarding is wanted, call pci_bridge_disable_base_limit() * after this function. */ pci_byte_test_and_clear_mask(conf + PCI_IO_BASE, PCI_IO_RANGE_MASK & 0xff); pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT, PCI_IO_RANGE_MASK & 0xff); pci_word_test_and_clear_mask(conf + PCI_MEMORY_BASE, PCI_MEMORY_RANGE_MASK & 0xffff); pci_word_test_and_clear_mask(conf + PCI_MEMORY_LIMIT, PCI_MEMORY_RANGE_MASK & 0xffff); pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_BASE, PCI_PREF_RANGE_MASK & 0xffff); pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_LIMIT, PCI_PREF_RANGE_MASK & 0xffff); pci_set_long(conf + PCI_PREF_BASE_UPPER32, 0); pci_set_long(conf + PCI_PREF_LIMIT_UPPER32, 0); pci_set_word(conf + PCI_BRIDGE_CONTROL, 0); } /* default qdev initialization function for PCI-to-PCI bridge */ int pci_bridge_initfn(PCIDevice *dev) { PCIBus *parent = dev->bus; PCIBridge *br = DO_UPCAST(PCIBridge, dev, dev); PCIBus *sec_bus = &br->sec_bus; pci_word_test_and_set_mask(dev->config + PCI_STATUS, PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK); pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_PCI); dev->config[PCI_HEADER_TYPE] = (dev->config[PCI_HEADER_TYPE] & PCI_HEADER_TYPE_MULTI_FUNCTION) | PCI_HEADER_TYPE_BRIDGE; pci_set_word(dev->config + PCI_SEC_STATUS, PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK); /* * If we don't specify the name, the bus will be addressed as .0, where * id is the device id. * Since PCI Bridge devices have a single bus each, we don't need the index: * let users address the bus using the device name. */ if (!br->bus_name && dev->qdev.id && *dev->qdev.id) { br->bus_name = dev->qdev.id; } qbus_create_inplace(&sec_bus->qbus, TYPE_PCI_BUS, &dev->qdev, 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_bridge_pci", INT64_MAX); sec_bus->address_space_io = &br->address_space_io; memory_region_init(&br->address_space_io, "pci_bridge_io", 65536); br->windows = pci_bridge_region_init(br); QLIST_INIT(&sec_bus->child); QLIST_INSERT_HEAD(&parent->child, sec_bus, sibling); return 0; } /* default qdev clean up function for PCI-to-PCI bridge */ 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_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() */ } /* * before qdev initialization(qdev_init()), this function sets bus_name and * map_irq callback which are necessry for pci_bridge_initfn() to * initialize bus. */ void pci_bridge_map_irq(PCIBridge *br, const char* bus_name, pci_map_irq_fn map_irq) { br->map_irq = map_irq; br->bus_name = bus_name; }