| /* |
| * 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; |
| |
| printk(KERN_INFO "Intel E7520/7320/7525 detected."); |
| |
| /* 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 "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 |
