linux/arch/i386/kernel/quirks.c
Alan Cox da9bb1d27b [PATCH] EDAC: core EDAC support code
This is a subset of the bluesmoke project core code, stripped of the NMI work
which isn't ready to merge and some of the "interesting" proc functionality
that needs reworking or just has no place in kernel.  It requires no core
kernel changes except the added scrub functions already posted.

The goal is to merge further functionality only after the core code is
accepted and proven in the base kernel, and only at the point the upstream
extras are really ready to merge.

From: doug thompson <norsk5@xmission.com>

  This converts EDAC to sysfs and is the final chunk neccessary before EDAC
  has a stable user space API and can be considered for submission into the
  base kernel.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: doug thompson <norsk5@xmission.com>
Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-18 19:20:31 -08:00

52 lines
1.5 KiB
C

/*
* This file contains work-arounds for x86 and x86_64 platform bugs.
*/
#include <linux/config.h>
#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