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Subject[PATCH] x86_64 VIA chipset IOAPIC fix
Hi Andi & Len,

Sorry for cross posting all over the place, I tried to CC some people who have
been bugged by this bug.

I finally got the IOAPIC working on my eMachines m6805 amd64 laptop with the
following patch. I have not tried it on any other machines, so can you guys
please check the sanity and make the necessary changes if needed?

This fixes at least ACPI bug 2090:

http://bugme.osdl.org/show_bug.cgi?id=2090

Might fix some other x86 VIA bugs too?

To turn it on, apic still needs to be specified in the kernel cmdline:

root=/dev/hda3 ro psmouse.proto=imps apic console=tty0

Now cat /proc/interrupts shows:

0: 70843 IO-APIC-edge timer
1: 9 IO-APIC-edge i8042
2: 0 XT-PIC cascade
8: 0 IO-APIC-edge rtc
10: 0 IO-APIC-level acpi
12: 44 IO-APIC-edge i8042
14: 2734 IO-APIC-edge ide0
15: 19 IO-APIC-edge ide1
17: 0 IO-APIC-level yenta
18: 0 IO-APIC-level eth0
21: 565 IO-APIC-level ehci_hcd, uhci_hcd, uhci_hcd, uhci_hcd
22: 0 IO-APIC-level VIA8233
23: 6 IO-APIC-level eth1
NMI: 12
LOC: 70752
ERR: 0
MIS: 0

And things are just working :)

Regards,

Tony

And here's the patch, it's against 2.6.5-rc2:

diff -Nru a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
--- a/drivers/acpi/pci_link.c Wed Feb 25 21:11:46 2004
+++ b/drivers/acpi/pci_link.c Wed Mar 24 18:47:48 2004
@@ -402,10 +402,8 @@
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n"));
return_VALUE(result);
}
- if (!link->device->status.enabled) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link disabled\n"));
- return_VALUE(-ENODEV);
- }
+ if (!link->device->status.enabled)
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled: VIA chipset? Trying to continue\n"));

/* Make sure the active IRQ is the one we requested. */
result = acpi_pci_link_try_get_current(link, irq);
@@ -415,11 +413,9 @@

if (link->irq.active != irq) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Attempt to enable at IRQ %d resulted in IRQ %d\n",
- irq, link->irq.active));
- link->irq.active = 0;
- acpi_ut_evaluate_object (link->handle, "_DIS", 0, NULL);
- return_VALUE(-ENODEV);
+ "Attempt to enable at IRQ %d resulted in IRQ %d: VIA chipset? Using irq %d\n",
+ irq, link->irq.active, irq));
+ link->irq.active = irq;
}

ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
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