diff options
Diffstat (limited to 'arch/x86/kernel/quirks.c')
| -rw-r--r-- | arch/x86/kernel/quirks.c | 49 |
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 |