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-rw-r--r--arch/x86/kernel/quirks.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c
new file mode 100644
index 000000000000..6722469c2633
--- /dev/null
+++ b/arch/x86/kernel/quirks.c
@@ -0,0 +1,49 @@
+/*
+ * This file contains work-arounds for x86 and x86_64 platform bugs.
+ */
+#include <linux/pci.h>
+#include <linux/irq.h>
+
+#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
+
+static void __devinit quirk_intel_irqbalance(struct pci_dev *dev)
+{
+ u8 config, rev;
+ u32 word;
+
+ /* BIOS may enable hardware IRQ balancing for
+ * E7520/E7320/E7525(revision ID 0x9 and below)
+ * based platforms.
+ * Disable SW irqbalance/affinity on those platforms.
+ */
+ pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
+ if (rev > 0x9)
+ return;
+
+ /* enable access to config space*/
+ pci_read_config_byte(dev, 0xf4, &config);
+ pci_write_config_byte(dev, 0xf4, config|0x2);
+
+ /* read xTPR register */
+ raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word);
+
+ if (!(word & (1 << 13))) {
+ printk(KERN_INFO "Intel E7520/7320/7525 detected. "
+ "Disabling irq balancing and affinity\n");
+#ifdef CONFIG_IRQBALANCE
+ irqbalance_disable("");
+#endif
+ noirqdebug_setup("");
+#ifdef CONFIG_PROC_FS
+ no_irq_affinity = 1;
+#endif
+ }
+
+ /* put back the original value for config space*/
+ if (!(config & 0x2))
+ pci_write_config_byte(dev, 0xf4, config);
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7320_MCH, quirk_intel_irqbalance);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7525_MCH, quirk_intel_irqbalance);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7520_MCH, quirk_intel_irqbalance);
+#endif