Some bios put range that is not fully coverred by root bus resources. Try to clip them and update them in pci bridge bars.
We'd like to fix other arches instead of just x86. Link: https://bugzilla.kernel.org/show_bug.cgi?id=85491 Reported-by: Marek Kordik <[email protected]> Fixes: 5b28541552ef ("PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources") Signed-off-by: Yinghai Lu <[email protected]> Cc: Richard Henderson <[email protected]> Cc: Ivan Kokshaysky <[email protected]> Cc: Matt Turner <[email protected]> Cc: [email protected] --- arch/alpha/kernel/pci.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/arch/alpha/kernel/pci.c b/arch/alpha/kernel/pci.c index 076c35c..b54b40f 100644 --- a/arch/alpha/kernel/pci.c +++ b/arch/alpha/kernel/pci.c @@ -277,6 +277,7 @@ pcibios_claim_one_bus(struct pci_bus *b) struct pci_bus *child_bus; list_for_each_entry(dev, &b->devices, bus_list) { + bool changed = false; int i; for (i = 0; i < PCI_NUM_RESOURCES; i++) { @@ -285,9 +286,28 @@ pcibios_claim_one_bus(struct pci_bus *b) if (r->parent || !r->start || !r->flags) continue; if (pci_has_flag(PCI_PROBE_ONLY) || - (r->flags & IORESOURCE_PCI_FIXED)) - pci_claim_resource(dev, i); + (r->flags & IORESOURCE_PCI_FIXED)) { + if (pci_claim_resource(dev, i) >= 0) + continue; + + if (dev->subordinate && + i >= PCI_BRIDGE_RESOURCES && + i < PCI_NUM_RESOURCES && + (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && + pci_bus_clip_resource(dev, r)) { + changed = true; + pci_claim_resource(dev, i); + } else if (i < PCI_BRIDGE_RESOURCES && + i != PCI_ROM_RESOURCE && + pci_bus_clip_resource(dev, r)) { + pci_update_resource(dev, i); + pci_claim_resource(dev, i); + } + } } + + if (changed) + pci_setup_bridge(dev->subordinate); } list_for_each_entry(child_bus, &b->children, node) -- 1.8.4.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
