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Date: Wed, 2 May 2012 15:22:00 -0600 From: Bjorn Helgaas <bhelgaas@...gle.com> To: Yinghai Lu <yinghai@...nel.org> Cc: Jesse Barnes <jbarnes@...tuousgeek.org>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Tony Luck <tony.luck@...el.com>, David Miller <davem@...emloft.net>, x86 <x86@...nel.org>, Dominik Brodowski <linux@...inikbrodowski.net>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org Subject: Re: [PATCH -v11 00/30] PCI: allocate pci bus num range for unassigned bridge busn On Sun, Mar 18, 2012 at 11:42 PM, Yinghai Lu <yinghai@...nel.org> 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. > > The patches need to apply to linux v3.3 + pci-next and > [PATCH -v3] PCI: pci_host_bridge related cleanup > > could be found at: > git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git for-pci-busn-alloc I started merging this series, but I didn't get very far. I stopped at the "resources: Add probe_resource()" patch because I don't think that interface makes sense yet. My work-in-progress is at git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git on the topic/yinghai-busn-alloc branch. I *could* merge that branch, but I don't think they fix anything (that would come in the later patches), and there are still some issues in my mind. - I think we really want a [bus 00-ff] resource for each *domain*, with each host bridge in the domain requesting part of that range. I think these patches only track bus number usage within each host bridge, and I'm not sure there's any place we would detect conflicts between host bridges. - I think I made a mistake in the pci_create_root_bus() and pci_scan_root_bus() interfaces. They currently take a bus number and a list of resources, and we expect the arch to include the bus number aperture in the list. The bus number argument should have been replaced with a bus number aperture resource. The bus number aperture is essential, while the MMIO/IO aperture list may be empty. And it's stupid to pass both the starting bus number and a bus resource that contains the starting bus number. Fixing this would make some of these patches quite a bit simpler. - In some of the arches (sparc, powerpc), you added a bus number resource right next to existing first_busno, last_busno fields. So now that data lives two places, which will bite us later. Bjorn > Yinghai Lu (30): > x86, PCI: Add print all root info for not using _CRS path > x86, PCI: Allocate temp range array in amd_bus pci_root_info probing > x86, PCI: Merge pcibios_scan_root and pci_scan_bus_on_node > PCI: Add busn_res into struct pci_bus. > PCI: Add busn_res operation functions > PCI: Release busn_res when removing bus > PCI: Insert busn_res in pci_create_root_bus() > PCI: Checking busn_res in pci_scan_root_bus() > PCI: Add default busn_resource > PCI: Add default busn_res for pci_scan_bus() > x86, PCI: Add busn_res into resources list for acpi path > x86, PCI: Put busn resource in pci_root_info for not using _CRS path > PCI, ia64: Register busn_res for root buses > PCI, sparc: Register busn_res for root buses > PCI, powerpc: Register busn_res for root buses > PCI, parisc: Register busn_res for root buses > resources: Add probe_resource() > resources: Replace registered resource in tree. > PCI: Add pci_bus_extend/shrink_top() > PCI: Probe safe range that we can use for unassigned bridge. > PCI: Add pci_bus_replace_busn_res() > PCI: Allocate bus range instead of use max blindly > PCI: Strict checking of valid range for bridge > PCI: Kill pci_fixup_parent_subordinate_busnr() > PCI: Seperate child bus scanning to two passes overall > pcmcia: Remove workaround for fixing pci parent bus subordinate > PCI: Double checking setting for bus register and bus struct. > PCI, pciehp: Remove not needed bus number range checking > PCI: More strict checking of valid range for bridge > PCI: Don't shrink too much for hotplug bridge > > arch/ia64/pci/pci.c | 2 + > 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 | 11 +- > arch/x86/pci/amd_bus.c | 14 +- > arch/x86/pci/bus_numa.c | 30 ++- > arch/x86/pci/bus_numa.h | 4 +- > 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 | 439 +++++++++++++++++++++++++++------ > drivers/pci/remove.c | 1 + > drivers/pcmcia/yenta_socket.c | 75 ------ > include/linux/ioport.h | 8 + > include/linux/pci.h | 6 + > kernel/resource.c | 175 +++++++++++++- > 19 files changed, 613 insertions(+), 215 deletions(-) > > -- > 1.7.7 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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