2 * This file contains work-arounds for x86 and x86_64 platform bugs.
7 #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
9 static void __devinit
quirk_intel_irqbalance(struct pci_dev
*dev
)
14 /* BIOS may enable hardware IRQ balancing for
15 * E7520/E7320/E7525(revision ID 0x9 and below)
17 * Disable SW irqbalance/affinity on those platforms.
19 pci_read_config_byte(dev
, PCI_CLASS_REVISION
, &rev
);
23 /* enable access to config space*/
24 pci_read_config_byte(dev
, 0xf4, &config
);
25 pci_write_config_byte(dev
, 0xf4, config
|0x2);
27 /* read xTPR register */
28 raw_pci_ops
->read(0, 0, 0x40, 0x4c, 2, &word
);
30 if (!(word
& (1 << 13))) {
31 printk(KERN_INFO
"Intel E7520/7320/7525 detected. "
32 "Disabling irq balancing and affinity\n");
33 #ifdef CONFIG_IRQBALANCE
34 irqbalance_disable("");
42 /* put back the original value for config space*/
44 pci_write_config_byte(dev
, 0xf4, config
);
46 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL
, PCI_DEVICE_ID_INTEL_E7320_MCH
, quirk_intel_irqbalance
);
47 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL
, PCI_DEVICE_ID_INTEL_E7525_MCH
, quirk_intel_irqbalance
);
48 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL
, PCI_DEVICE_ID_INTEL_E7520_MCH
, quirk_intel_irqbalance
);