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[PATCH] x86: Fix verify_quirk_intel_irqbalance()

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Fix verify_quirk_intel_irqbalance(). genapic checks should really
happen only on affected versions of the E7520/E7320/E7525 based platforms.

AK: This should akpm's Coyote SDV

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen 2006-12-09 21:33:35 +01:00 committed by Andi Kleen
parent e0f27981f2
commit 16d279d277
1 changed files with 29 additions and 4 deletions
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25
arch/i386/kernel/quirks.c
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@ -10,6 +10,26 @@
#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");
@ -19,6 +39,11 @@ static void __devinit verify_quirk_intel_irqbalance(struct pci_dev *dev)
#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;