From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Yinghai Lu To: Bjorn Helgaas Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Yinghai Lu , Tony Luck , Fenghua Yu , "Rafael J. Wysocki" , linux-ia64@vger.kernel.org Subject: [PATCH 05/10] PCI, ia64: clip firmware assigned resource under parent bridge's Date: Mon, 12 Jan 2015 11:23:15 -0800 Message-Id: <1421090600-9750-6-git-send-email-yinghai@kernel.org> In-Reply-To: <1421090600-9750-1-git-send-email-yinghai@kernel.org> References: <1421090600-9750-1-git-send-email-yinghai@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 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 Fixes: 5b28541552ef ("PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources") Signed-off-by: Yinghai Lu Cc: Tony Luck Cc: Fenghua Yu Cc: "Rafael J. Wysocki" Cc: linux-ia64@vger.kernel.org --- arch/ia64/pci/pci.c | 71 +++++++++++++++++++++++++++++++++-------------------- 1 file changed, 44 insertions(+), 27 deletions(-) diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c index 291a582..a3f9e27 100644 --- a/arch/ia64/pci/pci.c +++ b/arch/ia64/pci/pci.c @@ -487,45 +487,57 @@ int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) return 0; } -static int is_valid_resource(struct pci_dev *dev, int idx) +void pcibios_fixup_device_resources(struct pci_dev *dev) { - unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM; - struct resource *devr = &dev->resource[idx], *busr; + int idx; if (!dev->bus) - return 0; + return; - pci_bus_for_each_resource(dev->bus, busr, i) { - if (!busr || ((busr->flags ^ devr->flags) & type_mask)) + for (idx = 0; idx < PCI_BRIDGE_RESOURCES; idx++) { + struct resource *r = &dev->resource[idx]; + + if (!r->flags || r->parent || !r->start) continue; - if ((devr->start) && (devr->start >= busr->start) && - (devr->end <= busr->end)) - return 1; + + if (pci_claim_resource(dev, idx) >= 0) + continue; + + /* try again with clip */ + if (pci_bus_clip_resource(dev, r)) { + pci_update_resource(dev, idx); + pci_claim_resource(dev, idx); + } } - return 0; } +EXPORT_SYMBOL_GPL(pcibios_fixup_device_resources); -static void pcibios_fixup_resources(struct pci_dev *dev, int start, int limit) +static bool pcibios_fixup_bridge_resources(struct pci_dev *dev) { - int i; + int idx; + bool changed = false; + + if (!dev->bus) + return changed; + + for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) { + struct resource *r = &dev->resource[idx]; - for (i = start; i < limit; i++) { - if (!dev->resource[i].flags) + if (!r->flags || r->parent || !r->start) continue; - if ((is_valid_resource(dev, i))) - pci_claim_resource(dev, i); - } -} -void pcibios_fixup_device_resources(struct pci_dev *dev) -{ - pcibios_fixup_resources(dev, 0, PCI_BRIDGE_RESOURCES); -} -EXPORT_SYMBOL_GPL(pcibios_fixup_device_resources); + if (pci_claim_resource(dev, idx) >= 0) + continue; -static void pcibios_fixup_bridge_resources(struct pci_dev *dev) -{ - pcibios_fixup_resources(dev, PCI_BRIDGE_RESOURCES, PCI_NUM_RESOURCES); + /* try again after clip for pci bridge*/ + if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && + pci_bus_clip_resource(dev, r)) { + changed = true; + pci_claim_resource(dev, idx); + } + } + + return changed; } /* @@ -536,9 +548,14 @@ void pcibios_fixup_bus(struct pci_bus *b) struct pci_dev *dev; if (b->self) { + bool changed; + pci_read_bridge_bases(b); - pcibios_fixup_bridge_resources(b->self); + changed = pcibios_fixup_bridge_resources(b->self); + if (changed) + pci_setup_bridge(b); } + list_for_each_entry(dev, &b->devices, bus_list) pcibios_fixup_device_resources(dev); platform_pci_fixup_bus(b); -- 1.8.4.5