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/arch/i386/kernel/quirks.c

https://bitbucket.org/evzijst/gittest
C | 52 lines | 33 code | 8 blank | 11 comment | 4 complexity | bc963607d0a83f9a6949dbf934f4a6c3 MD5 | raw file
 1/*
 2 * This file contains work-arounds for x86 and x86_64 platform bugs.
 3 */
 4#include <linux/config.h>
 5#include <linux/pci.h>
 6#include <linux/irq.h>
 7
 8#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
 9
10static void __devinit quirk_intel_irqbalance(struct pci_dev *dev)
11{
12	u8 config, rev;
13	u32 word;
14
15	/* BIOS may enable hardware IRQ balancing for
16	 * E7520/E7320/E7525(revision ID 0x9 and below)
17	 * based platforms.
18	 * Disable SW irqbalance/affinity on those platforms.
19	 */
20	pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
21	if (rev > 0x9)
22		return;
23
24	printk(KERN_INFO "Intel E7520/7320/7525 detected.");
25
26	/* enable access to config space*/
27	pci_read_config_byte(dev, 0xf4, &config);
28	config |= 0x2;
29	pci_write_config_byte(dev, 0xf4, config);
30
31	/* read xTPR register */
32	raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word);
33
34	if (!(word & (1 << 13))) {
35		printk(KERN_INFO "Disabling irq balancing and affinity\n");
36#ifdef CONFIG_IRQBALANCE
37		irqbalance_disable("");
38#endif
39		noirqdebug_setup("");
40#ifdef CONFIG_PROC_FS
41		no_irq_affinity = 1;
42#endif
43	}
44
45	config &= ~0x2;
46	/* disable access to config space*/
47	pci_write_config_byte(dev, 0xf4, config);
48}
49DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_E7320_MCH,	quirk_intel_irqbalance);
50DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_E7525_MCH,	quirk_intel_irqbalance);
51DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_E7520_MCH,	quirk_intel_irqbalance);
52#endif