projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * This file contains work-arounds for x86 and x86_64 platform bugs. | |
| 3 | */ | |
| 1da177e4 LT |
4 | #include <linux/pci.h> |
| 5 | #include <linux/irq.h> | |
| 6 | ||
| 7 | #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI) | |
| 8 | ||
| 9 | static void __devinit quirk_intel_irqbalance(struct pci_dev *dev) | |
| 10 | { | |
| 11 | u8 config, rev; | |
| 12 | u32 word; | |
| 13 | ||
| 14 | /* BIOS may enable hardware IRQ balancing for | |
| 15 | * E7520/E7320/E7525(revision ID 0x9 and below) | |
| 16 | * based platforms. | |
| 17 | * Disable SW irqbalance/affinity on those platforms. | |
| 18 | */ | |
| 19 | pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev); | |
| 20 | if (rev > 0x9) | |
| 21 | return; | |
| 22 | ||
| 23 | printk(KERN_INFO "Intel E7520/7320/7525 detected."); | |
| 24 | ||
| 25 | /* enable access to config space*/ | |
| 26 | pci_read_config_byte(dev, 0xf4, &config); | |
| da9bb1d2 | 27 | pci_write_config_byte(dev, 0xf4, config|0x2); |
| 1da177e4 LT |
28 | |
| 29 | /* read xTPR register */ | |
| 30 | raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word); | |
| 31 | ||
| 32 | if (!(word & (1 << 13))) { | |
| 33 | printk(KERN_INFO "Disabling irq balancing and affinity\n"); | |
| 34 | #ifdef CONFIG_IRQBALANCE | |
| 35 | irqbalance_disable(""); | |
| 36 | #endif | |
| 37 | noirqdebug_setup(""); | |
| 38 | #ifdef CONFIG_PROC_FS | |
| 39 | no_irq_affinity = 1; | |
| 40 | #endif | |
| 41 | } | |
| 42 | ||
| da9bb1d2 AC |
43 | /* put back the original value for config space*/ |
| 44 | if (!(config & 0x2)) | |
| 45 | pci_write_config_byte(dev, 0xf4, config); | |
| 1da177e4 LT |
46 | } |
| 47 | DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7320_MCH, quirk_intel_irqbalance); | |
| 48 | DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7525_MCH, quirk_intel_irqbalance); | |
| 49 | DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7520_MCH, quirk_intel_irqbalance); | |
| 50 | #endif |