You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
99 lines
2.8 KiB
99 lines
2.8 KiB
/*
|
|
* This file contains work-arounds for x86 and x86_64 platform bugs.
|
|
*/
|
|
#include <linux/pci.h>
|
|
#include <linux/irq.h>
|
|
#include <asm/pci-direct.h>
|
|
#include <asm/genapic.h>
|
|
#include <asm/cpu.h>
|
|
|
|
#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
|
|
static void __devinit verify_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.
|
|
* For those platforms, make sure that the genapic is set to 'flat'
|
|
*/
|
|
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))) {
|
|
#ifdef CONFIG_X86_64
|
|
if (genapic != &apic_flat)
|
|
panic("APIC mode must be flat on this system\n");
|
|
#elif defined(CONFIG_X86_GENERICARCH)
|
|
if (genapic != &apic_default)
|
|
panic("APIC mode must be default(flat) on this system. Use apic=default\n");
|
|
#endif
|
|
}
|
|
|
|
/* put back the original value for config space*/
|
|
if (!(config & 0x2))
|
|
pci_write_config_byte(dev, 0xf4, config);
|
|
}
|
|
|
|
void __init quirk_intel_irqbalance(void)
|
|
{
|
|
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.
|
|
*/
|
|
rev = read_pci_config_byte(0, 0, 0, PCI_CLASS_REVISION);
|
|
if (rev > 0x9)
|
|
return;
|
|
|
|
printk(KERN_INFO "Intel E7520/7320/7525 detected.");
|
|
|
|
/* enable access to config space */
|
|
config = read_pci_config_byte(0, 0, 0, 0xf4);
|
|
write_pci_config_byte(0, 0, 0, 0xf4, config|0x2);
|
|
|
|
/* read xTPR register */
|
|
word = read_pci_config_16(0, 0, 0x40, 0x4c);
|
|
|
|
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
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
printk(KERN_INFO "Disabling cpu hotplug control\n");
|
|
enable_cpu_hotplug = 0;
|
|
#endif
|
|
#ifdef CONFIG_X86_64
|
|
/* force the genapic selection to flat mode so that
|
|
* interrupts can be redirected to more than one CPU.
|
|
*/
|
|
genapic_force = &apic_flat;
|
|
#endif
|
|
}
|
|
|
|
/* put back the original value for config space */
|
|
if (!(config & 0x2))
|
|
write_pci_config_byte(0, 0, 0, 0xf4, config);
|
|
}
|
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7320_MCH, verify_quirk_intel_irqbalance);
|
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7525_MCH, verify_quirk_intel_irqbalance);
|
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7520_MCH, verify_quirk_intel_irqbalance);
|
|
|
|
#endif
|
|
|