On Mon, Feb 27, 2012 at 6:09 PM, Yinghai Lu [off-list ref] wrote:

Set up iobusn_resource tree, and register bus number range to it.
Later when need to find bus range, will try to allocate from the tree

Need to test on arches other than x86. esp for ia64 and powerpc that support
 more than on peer root buses.

 could be found at:
        git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
for-pci-busn-alloc

update to v9, and will pass bus resource through resources list.

will not send to the LKML, please check for-pci-busn-alloc branch.

or you can browse them from
http://git.kernel.org/?p=linux/kernel/git/yinghai/linux-yinghai.git;a=shortlog;h=refs/heads/for-pci-busn-alloc

4d92227: PCI, pciehp: Remove not needed bus number range checking
edccefd: PCI: Double checking setting for bus register and bus struct.
d1d6372: pcmcia: remove workaround for fixing pci parent bus subordinate
5bb9418: PCI: Seperate child bus scanning to two passes overall
d0fd5ac: PCI: kill pci_fixup_parent_subordinate_busnr()
b86867f: PCI: Allocate bus range instead of use max blindly
8d0fbe4: PCI: Strict checking of valid range for bridge
8c26011: PCI: Probe safe range that we can use for unassigned bridge.
a7b217b: PCI: Add pci_bus_extend/shrink_top()
d8f54cd: PCI, parisc: Register busn_res for root buses
e02e198: PCI, powerpc: Register busn_res for root buses
d10c14b: PCI, sparc: Register busn_res for root buses
4977b59: PCI, ia64: Register busn_res for root buses
d169b44: x86, PCI: put busn resource in pci_root_info for no_crs path
c77a824: x86, PCI: put busn resource in pci_root_info for acpi path
1909435: PCI: add default res for pci_scan_bus
948a438: PCI: default busn_resource
5e2711b: PCI: checking busn_res in pci_scan_root_bus
c10e4a1: PCI: insert busn_res in pci_create_root_bus
fc176a9: PCI: release busn when removing bus
0eae1b6: PCI: Add busn_res operation functions
1e6215a: PCI: Add busn_res into struct pci_bus.
1f1fd3e: x86, PCI: Merge pcibios_scan_root and pci_scan_bus_on_node

need to apply to top of pci/for-linus plus pci/linux-next plus
       [PATCH -v2] PCI: pci_host_bridge related cleanup

-v2: according to Jesse, split to more small patches.
-v3: address some request from Bjorn. like make use %pR for busn_res debug print
       out, and move the comment change with code change.
-v4: fixes the problem about rescan that Bjorn found.
-v5: add /proc/iobusn that is requested by Bjorn.
    remove old workaround from pciehp.
    add rescan_bridge for pci bridge in /sys
-v6: remove global iobusn_resource, and every root bus's busn_res will be root
    of children buses' busn_res.
    pc cardbus change is tested by pcmcia maintainter.
-v7: remove pci_scan_root_bus_max requested by Bjorn and Jesse.
-v8: rebase on top other patches with arch/x86/pci/bus_numa.c changes
    also only include busn_res related changes.

 arch/ia64/include/asm/pci.h           |    1 +
 arch/ia64/pci/pci.c                   |    5 +
 arch/powerpc/include/asm/pci-bridge.h |    1 +
 arch/powerpc/kernel/pci-common.c      |   10 +-
 arch/sparc/kernel/pci.c               |    4 +
 arch/sparc/kernel/pci_impl.h          |    1 +
 arch/x86/pci/acpi.c                   |   12 +-
 arch/x86/pci/broadcom_bus.c           |    4 +-
 arch/x86/pci/bus_numa.c               |   19 +-
 arch/x86/pci/bus_numa.h               |    3 +-
 arch/x86/pci/common.c                 |   27 +--
 drivers/parisc/dino.c                 |    5 +
 drivers/parisc/lba_pci.c              |    3 +
 drivers/pci/hotplug/pciehp_pci.c      |   12 +-
 drivers/pci/probe.c                   |  458 +++++++++++++++++++++++++++------
 drivers/pci/remove.c                  |    1 +
 drivers/pcmcia/yenta_socket.c         |   75 ------
 include/linux/pci.h                   |    6 +
 18 files changed, 441 insertions(+), 206 deletions(-)