iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

PCI: Assign PCI domain IDs by ida_alloc()

Browse Source 
Replace assignment of PCI domain IDs from atomic_inc_return() to
ida_alloc().

Use two IDAs, one for static domain allocations (those which are defined in
device tree) and second for dynamic allocations (all other).

During removal of root bus / host bridge, also release the domain ID.  The
released ID can be reused again, for example when dynamically loading and
unloading native PCI host bridge drivers.

This change also allows to mix static device tree assignment and dynamic by
kernel as all static allocations are reserved in dynamic pool.

[bhelgaas: set "err" if "bus->domain_nr < 0"]
Link: https://lore.kernel.org/r/20220714184130.5436-1-pali@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Pali Rohár
2022-07-14 20:41:30 +02:00
committed by Bjorn Helgaas
parent 44e985938e
commit c14f7ccc9f
4 changed files with 76 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/pci/remove.c
View File

@@ -160,6 +160,12 @@ void pci_remove_root_bus(struct pci_bus *bus)
pci_remove_bus(bus);
host_bridge->bus = NULL;
#ifdef CONFIG_PCI_DOMAINS_GENERIC
/* Release domain_nr if it was dynamically allocated */
if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
pci_bus_release_domain_nr(bus, host_bridge->dev.parent);
#endif
/* remove the host bridge */
device_del(&host_bridge->dev);
}