Some bios put range that is not fully coverred by root bus resources. Try to clip them and update them in pci bridge bars.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=85491 Reported-by: Marek Kordik <kordikma...@gmail.com> Tested-by: Marek Kordik <kordikma...@gmail.com> Fixes: 5b28541552ef ("PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources") Signed-off-by: Yinghai Lu <ying...@kernel.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Ingo Molnar <mi...@redhat.com> Cc: "H. Peter Anvin" <h...@zytor.com> Cc: x...@kernel.org --- arch/x86/pci/i386.c | 74 +++++++++++++++++++++++++++++++++++++---------------- 1 file changed, 52 insertions(+), 22 deletions(-) diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c index 9b18ef3..d43e1af 100644 --- a/arch/x86/pci/i386.c +++ b/arch/x86/pci/i386.c @@ -205,10 +205,11 @@ EXPORT_SYMBOL(pcibios_align_resource); * as well. */ -static void pcibios_allocate_bridge_resources(struct pci_dev *dev) +static bool pcibios_allocate_bridge_resources(struct pci_dev *dev) { int idx; struct resource *r; + bool changed = false; for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) { r = &dev->resource[idx]; @@ -216,17 +217,33 @@ static void pcibios_allocate_bridge_resources(struct pci_dev *dev) continue; if (r->parent) /* Already allocated */ continue; - if (!r->start || pci_claim_resource(dev, idx) < 0) { - /* - * Something is wrong with the region. - * Invalidate the resource to prevent - * child resource allocations in this - * range. - */ - r->start = r->end = 0; - r->flags = 0; + + if (!r->start) + goto clear; + + if (pci_claim_resource(dev, idx) >= 0) + continue; + + /* try again after clip for pci bridge*/ + if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && + pci_bus_clip_resource(dev, r)) { + changed = true; + if (pci_claim_resource(dev, idx) >= 0) + continue; } + +clear: + /* + * Something is wrong with the region. + * Invalidate the resource to prevent + * child resource allocations in this + * range. + */ + r->start = r->end = 0; + r->flags = 0; } + + return changed; } static void pcibios_allocate_bus_resources(struct pci_bus *bus) @@ -234,8 +251,12 @@ static void pcibios_allocate_bus_resources(struct pci_bus *bus) struct pci_bus *child; /* Depth-First Search on bus tree */ - if (bus->self) - pcibios_allocate_bridge_resources(bus->self); + if (bus->self) { + bool changed = pcibios_allocate_bridge_resources(bus->self); + + if (changed) + pci_setup_bridge(bus); + } list_for_each_entry(child, &bus->children, node) pcibios_allocate_bus_resources(child); } @@ -274,18 +295,27 @@ static void pcibios_allocate_dev_resources(struct pci_dev *dev, int pass) dev_dbg(&dev->dev, "BAR %d: reserving %pr (d=%d, p=%d)\n", idx, r, disabled, pass); - if (pci_claim_resource(dev, idx) < 0) { - if (r->flags & IORESOURCE_PCI_FIXED) { - dev_info(&dev->dev, "BAR %d %pR is immovable\n", + + if (pci_claim_resource(dev, idx) >= 0) + continue; + + if (r->flags & IORESOURCE_PCI_FIXED) { + dev_info(&dev->dev, "BAR %d %pR is immovable\n", idx, r); - } else { - /* We'll assign a new address later */ - pcibios_save_fw_addr(dev, - idx, r->start); - r->end -= r->start; - r->start = 0; - } + continue; + } + + /* try again with clip */ + if (pci_bus_clip_resource(dev, r)) { + pci_update_resource(dev, idx); + if (pci_claim_resource(dev, idx) >= 0) + continue; } + + /* We'll assign a new address later */ + pcibios_save_fw_addr(dev, idx, r->start); + r->end -= r->start; + r->start = 0; } } if (!pass) { -- 1.8.4.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
