Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes...

[sfrench/cifs-2.6.git] / drivers / pci / quirks.c

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index cc96c7142dacdab47db9efbad91d345ec6590938..f5c63fe9db5c5b6666001ae03a1a4c561c644986 100644 (file)
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2297,6 +2297,37 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA,
                        PCI_DEVICE_ID_NVIDIA_NVENET_15,
                        nvenet_msi_disable);
 
+/*
+ * Some versions of the MCP55 bridge from nvidia have a legacy irq routing
+ * config register.  This register controls the routing of legacy interrupts
+ * from devices that route through the MCP55.  If this register is misprogramed
+ * interrupts are only sent to the bsp, unlike conventional systems where the
+ * irq is broadxast to all online cpus.  Not having this register set
+ * properly prevents kdump from booting up properly, so lets make sure that
+ * we have it set correctly.
+ * Note this is an undocumented register.
+ */
+static void __devinit nvbridge_check_legacy_irq_routing(struct pci_dev *dev)
+{
+       u32 cfg;
+
+       pci_read_config_dword(dev, 0x74, &cfg);
+
+       if (cfg & ((1 << 2) | (1 << 15))) {
+               printk(KERN_INFO "Rewriting irq routing register on MCP55\n");
+               cfg &= ~((1 << 2) | (1 << 15));
+               pci_write_config_dword(dev, 0x74, cfg);
+       }
+}
+
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA,
+                       PCI_DEVICE_ID_NVIDIA_MCP55_BRIDGE_V0,
+                       nvbridge_check_legacy_irq_routing);
+
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA,
+                       PCI_DEVICE_ID_NVIDIA_MCP55_BRIDGE_V4,
+                       nvbridge_check_legacy_irq_routing);
+
 static int __devinit ht_check_msi_mapping(struct pci_dev *dev)
 {
        int pos, ttl = 48;