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hw/pci: Add pci_bus_range() to get PCI bus number range 

This helps to get the min and max bus number of a PCI bus hierarchy.

Signed-off-by: Xingang Wang <wangxingang5@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <1625748919-52456-6-git-send-email-wangxingang5@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xingang Wang 2021-07-08 12:55:15 +00:00 committed by Michael S. Tsirkin
parent c9e96b04fc
commit 500db1daf3
2 changed files with 17 additions and 0 deletions
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16
hw/pci/pci.c
View File

@ -537,6 +537,22 @@ int pci_bus_num(PCIBus *s)
return PCI_BUS_GET_CLASS(s)->bus_num(s);
}
/* Returns the min and max bus numbers of a PCI bus hierarchy */
void pci_bus_range(PCIBus *bus, int *min_bus, int *max_bus)
{
int i;
*min_bus = *max_bus = pci_bus_num(bus);
for (i = 0; i < ARRAY_SIZE(bus->devices); ++i) {
PCIDevice *dev = bus->devices[i];
if (dev && PCI_DEVICE_GET_CLASS(dev)->is_bridge) {
*min_bus = MIN(*min_bus, dev->config[PCI_SECONDARY_BUS]);
*max_bus = MAX(*max_bus, dev->config[PCI_SUBORDINATE_BUS]);
}
}
}
int pci_bus_numa_node(PCIBus *bus)
{
return PCI_BUS_GET_CLASS(bus)->numa_node(bus);

1
include/hw/pci/pci.h
View File

@ -450,6 +450,7 @@ static inline PCIBus *pci_get_bus(const PCIDevice *dev)
return PCI_BUS(qdev_get_parent_bus(DEVICE(dev)));
}
int pci_bus_num(PCIBus *s);
void pci_bus_range(PCIBus *bus, int *min_bus, int *max_bus);
static inline int pci_dev_bus_num(const PCIDevice *dev)
{
return pci_bus_num(pci_get_bus(dev));