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[PATCH] Fix HPET operation on 64-bit NVIDIA platforms

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From: "Andy Currid" <ACurrid@nvidia.com>

This patch fixes a kernel panic during boot that occurs on NVIDIA platforms
that have HPET enabled.

When HPET is enabled, the standard timer IRQ is routed to IOAPIC pin 2 and is
advertised as such in the ACPI APIC table - but an earlier workaround in the
kernel was ignoring this override.  The fix is to honor timer IRQ overrides
from ACPI when HPET is detected on an NVIDIA platform.

Signed-off-by: Andy Currid <acurrid@nvidia.com>
Cc: "Brown, Len" <len.brown@intel.com>
Cc: "Yu, Luming" <luming.yu@intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andy Currid 2006-06-08 00:43:39 -07:00 committed by Linus Torvalds
parent d44647b0a6
commit a2ef3a50f1
1 changed files with 25 additions and 5 deletions
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30
arch/x86_64/kernel/io_apic.c
View file

@ -271,6 +271,18 @@ __setup("enable_8254_timer", setup_enable_8254_timer);
#include <linux/pci_ids.h>
#include <linux/pci.h>
#ifdef CONFIG_ACPI
static int nvidia_hpet_detected __initdata;
static int __init nvidia_hpet_check(unsigned long phys, unsigned long size)
{
nvidia_hpet_detected = 1;
return 0;
}
#endif
/* Temporary Hack. Nvidia and VIA boards currently only work with IO-APIC
off. Check for an Nvidia or VIA PCI bridge and turn it off.
Use pci direct infrastructure because this runs before the PCI subsystem.
@ -317,11 +329,19 @@ void __init check_ioapic(void)
return;
case PCI_VENDOR_ID_NVIDIA:
#ifdef CONFIG_ACPI
/* All timer overrides on Nvidia
seem to be wrong. Skip them. */
acpi_skip_timer_override = 1;
printk(KERN_INFO
"Nvidia board detected. Ignoring ACPI timer override.\n");
/*
* All timer overrides on Nvidia are
* wrong unless HPET is enabled.
*/
nvidia_hpet_detected = 0;
acpi_table_parse(ACPI_HPET,
nvidia_hpet_check);
if (nvidia_hpet_detected == 0) {
acpi_skip_timer_override = 1;
printk(KERN_INFO "Nvidia board "
"detected. Ignoring ACPI "
"timer override.\n");
}
#endif
/* RED-PEN skip them on mptables too? */
return;