| /* |
| * 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 <yamahata at valinux co jp> |
| * VA Linux Systems Japan K.K. |
| */ |
| |
| #include "pci_bridge.h" |
| #include "pci_internals.h" |
| #include "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 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) |
| { |
| 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 <id>.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); |
| 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 */ |
| 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; |
| } |
| |
| /* |
| * 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; |
| } |