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x86, pci: introduce config option for pci reroute quirks (was: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI) 

This is against linux-2.6-tip, branch pci-ioapic-boot-irq-quirks.

From: Stefan Assmann <sassmann@suse.de>
Subject: Introduce config option for pci reroute quirks

The config option X86_REROUTE_FOR_BROKEN_BOOT_IRQS is introduced to
enable (or disable) the redirection of the interrupt handler to the boot
interrupt line by default. Depending on the existence of interrupt
masking / threaded interrupt handling in the kernel (vanilla, rt, ...)
and the maturity of the rerouting patch, users can enable or disable the
redirection by default.

This means that the reroute quirk can be applied to any kernel without
changing it.

Interrupt sharing could be increased if this option is enabled. However this
option is vital for threaded interrupt handling, as done by the RT kernel.
It should simplify the consolidation with the RT kernel.

The option can be overridden by either pci=ioapicreroute or
pci=noioapicreroute.

Signed-off-by: Stefan Assmann <sassmann@suse.de>
Signed-off-by: Olaf Dabrunz <od@suse.de>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Jon Masters <jonathan@jonmasters.org>
Cc: Ihno Krumreich <ihno@suse.de>
Cc: Sven Dietrich <sdietrich@suse.de>
Cc: Daniel Gollub <dgollub@suse.de>
Cc: Felix Foerster <ffoerster@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Stefan Assmann 2008-07-15 13:48:55 +02:00 committed by Ingo Molnar
parent 3e370b29d3
commit 41b9eb264c
5 changed files with 38 additions and 2 deletions
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4
Documentation/kernel-parameters.txt
View File

@ -1536,6 +1536,10 @@ and is between 256 and 4096 characters. It is defined in the file
primary IO-APIC for bridges that cannot disable
boot IRQs. This fixes a source of spurious IRQs
when the system masks IRQs.
noioapicreroute [APIC] Disable workaround that uses the
boot IRQ equivalent of an IRQ that connects to
a chipset where boot IRQs cannot be disabled.
The opposite of ioapicreroute.
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

24
arch/x86/Kconfig
View File

@ -665,6 +665,30 @@ config X86_VISWS_APIC
def_bool y
depends on X86_32 && X86_VISWS
config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
bool "Reroute for broken boot IRQs"
default n
depends on X86_IO_APIC
help
This option enables a workaround that fixes a source of
spurious interrupts. This is recommended when threaded
interrupt handling is used on systems where the generation of
superfluous "boot interrupts" cannot be disabled.
Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
entry in the chipset's IO-APIC is masked (as, e.g. the RT
kernel does during interrupt handling). On chipsets where this
boot IRQ generation cannot be disabled, this workaround keeps
the original IRQ line masked so that only the equivalent "boot
IRQ" is delivered to the CPUs. The workaround also tells the
kernel to set up the IRQ handler on the boot IRQ line. In this
way only one interrupt is delivered to the kernel. Otherwise
the spurious second interrupt may cause the kernel to bring
down (vital) interrupt lines.
Only affects "broken" chipsets. Interrupt sharing may be
increased on these systems.
config X86_MCE
bool "Machine Check Exception"
depends on !X86_VOYAGER

8
arch/x86/pci/common.c
View File

@ -24,7 +24,11 @@ unsigned int pci_early_dump_regs;
static int pci_bf_sort;
int pci_routeirq;
int noioapicquirk;
#ifdef CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
int noioapicreroute = 0;
#else
int noioapicreroute = 1;
#endif
int pcibios_last_bus = -1;
unsigned long pirq_table_addr;
struct pci_bus *pci_root_bus;
@ -528,6 +532,10 @@ char * __devinit pcibios_setup(char *str)
if (noioapicreroute != -1)
noioapicreroute = 0;
return NULL;
} else if (!strcmp(str, "noioapicreroute")) {
if (noioapicreroute != -1)
noioapicreroute = 1;
return NULL;
}
return str;
}

2
drivers/pci/quirks.c
View File

@ -1397,7 +1397,7 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x260b, quirk_intel_pcie_pm);
*/
static void quirk_reroute_to_boot_interrupts_intel(struct pci_dev *dev)
{
if (noioapicquirk)
if (noioapicquirk || noioapicreroute)
return;
dev->irq_reroute_variant = INTEL_IRQ_REROUTE_VARIANT;

2
include/asm-x86/pci.h
View File

@ -20,7 +20,7 @@ struct pci_sysdata {
extern int pci_routeirq;
extern int noioapicquirk;
extern int ioapicreroute;
extern int noioapicreroute;
/* 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,