Revision 929176c3 hw/pci.c
| b/hw/pci.c | ||
|---|---|---|
| 1540 | 1540 |
} |
| 1541 | 1541 |
} |
| 1542 | 1542 |
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| 1543 |
/* Whether a given bus number is in range of the secondary |
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| 1544 |
* bus of the given bridge device. */ |
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| 1545 |
static bool pci_secondary_bus_in_range(PCIDevice *dev, int bus_num) |
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| 1546 |
{
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return !(pci_get_word(dev->config + PCI_BRIDGE_CONTROL) & |
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| 1548 |
PCI_BRIDGE_CTL_BUS_RESET) /* Don't walk the bus if it's reset. */ && |
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| 1549 |
dev->config[PCI_SECONDARY_BUS] < bus_num && |
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| 1550 |
bus_num <= dev->config[PCI_SUBORDINATE_BUS]; |
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| 1551 |
} |
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| 1552 |
|
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| 1543 | 1553 |
PCIBus *pci_find_bus(PCIBus *bus, int bus_num) |
| 1544 | 1554 |
{
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| 1545 | 1555 |
PCIBus *sec; |
| ... | ... | |
| 1552 | 1562 |
return bus; |
| 1553 | 1563 |
} |
| 1554 | 1564 |
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| 1565 |
/* Consider all bus numbers in range for the host pci bridge. */ |
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| 1566 |
if (bus->parent_dev && |
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| 1567 |
!pci_secondary_bus_in_range(bus->parent_dev, bus_num)) {
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| 1568 |
return NULL; |
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} |
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| 1570 |
|
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| 1555 | 1571 |
/* try child bus */ |
| 1556 |
if (!bus->parent_dev /* host pci bridge */ || |
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(bus->parent_dev->config[PCI_SECONDARY_BUS] < bus_num && |
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bus_num <= bus->parent_dev->config[PCI_SUBORDINATE_BUS])) {
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| 1559 |
for (; bus; bus = sec) {
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| 1560 |
QLIST_FOREACH(sec, &bus->child, sibling) {
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assert(sec->parent_dev); |
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if (sec->parent_dev->config[PCI_SECONDARY_BUS] == bus_num) {
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return sec; |
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| 1564 |
} |
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| 1565 |
if (sec->parent_dev->config[PCI_SECONDARY_BUS] < bus_num && |
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| 1566 |
bus_num <= sec->parent_dev->config[PCI_SUBORDINATE_BUS]) {
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| 1567 |
break; |
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| 1568 |
} |
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| 1572 |
for (; bus; bus = sec) {
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| 1573 |
QLIST_FOREACH(sec, &bus->child, sibling) {
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| 1574 |
assert(sec->parent_dev); |
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| 1575 |
if (sec->parent_dev->config[PCI_SECONDARY_BUS] == bus_num) {
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| 1576 |
return sec; |
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| 1577 |
} |
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| 1578 |
if (pci_secondary_bus_in_range(sec->parent_dev, bus_num)) {
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| 1579 |
break; |
|
| 1569 | 1580 |
} |
| 1570 | 1581 |
} |
| 1571 | 1582 |
} |
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