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x86, pci: introduce pci=ioapicreroute kernel cmdline option 

Introduce pci=ioapicreroute kernel cmdline option to enable rerouting of boot
interrupts to the primary io-apic.

Signed-off-by: Stefan Assmann <sassmann@suse.de>
Signed-off-by: Olaf Dabrunz <od@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Stefan Assmann 2008-06-11 16:35:15 +02:00 committed by Ingo Molnar
parent a9322f6488
commit 9197979b51
4 changed files with 14 additions and 0 deletions
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4
Documentation/kernel-parameters.txt
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@ -1521,6 +1521,10 @@ and is between 256 and 4096 characters. It is defined in the file
noioapicquirk [APIC] Disable all boot interrupt quirks.
Safety option to keep boot IRQs enabled. This
should never be necessary.
ioapicreroute [APIC] Enable rerouting of boot IRQs to the
primary IO-APIC for bridges that cannot disable
boot IRQs. This fixes a source of spurious IRQs
when the system masks IRQs.
biosirq [X86-32] Use PCI BIOS calls to get the interrupt
routing table. These calls are known to be buggy
on several machines and they hang the machine

5
arch/x86/pci/common.c
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@ -23,6 +23,7 @@ unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
static int pci_bf_sort;
int pci_routeirq;
int noioapicquirk;
int noioapicreroute = 1;
int pcibios_last_bus = -1;
unsigned long pirq_table_addr;
struct pci_bus *pci_root_bus;
@ -499,6 +500,10 @@ char * __devinit pcibios_setup(char *str)
} else if (!strcmp(str, "noioapicquirk")) {
noioapicquirk = 1;
return NULL;
} else if (!strcmp(str, "ioapicreroute")) {
if (noioapicreroute != -1)
noioapicreroute = 0;
return NULL;
}
return str;
}

4
include/asm-x86/io_apic.h
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@ -160,12 +160,16 @@ extern int skip_ioapic_setup;
/* 1 if "noapic" boot option passed */
extern int noioapicquirk;
/* -1 if "noapic" boot option passed */
extern int noioapicreroute;
/* 1 if the timer IRQ uses the '8259A Virtual Wire' mode */
extern int timer_through_8259;
static inline void disable_ioapic_setup(void)
{
noioapicquirk = 1;
noioapicreroute = -1;
skip_ioapic_setup = 1;
}

1
include/asm-x86/pci.h
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@ -20,6 +20,7 @@ struct pci_sysdata {
extern int pci_routeirq;
extern int noioapicquirk;
extern int ioapicreroute;
/* scan a bus after allocating a pci_sysdata for it */
extern struct pci_bus *pci_scan_bus_on_node(int busno, struct pci_ops *ops,