From 9197979b518573999d52d9e85bce1680682ed85c Mon Sep 17 00:00:00 2001 From: Stefan Assmann Date: Wed, 11 Jun 2008 16:35:15 +0200 Subject: [PATCH] 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 Signed-off-by: Olaf Dabrunz Signed-off-by: Ingo Molnar --- Documentation/kernel-parameters.txt | 4 ++++ arch/x86/pci/common.c | 5 +++++ include/asm-x86/io_apic.h | 4 ++++ include/asm-x86/pci.h | 1 + 4 files changed, 14 insertions(+) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 1aebe9dffba..df262b3c3d6 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -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 diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c index bc6a101ed7e..0a9eaa736d9 100644 --- a/arch/x86/pci/common.c +++ b/arch/x86/pci/common.c @@ -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; } diff --git a/include/asm-x86/io_apic.h b/include/asm-x86/io_apic.h index 8ca0110819f..a39670ae17d 100644 --- a/include/asm-x86/io_apic.h +++ b/include/asm-x86/io_apic.h @@ -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; } diff --git a/include/asm-x86/pci.h b/include/asm-x86/pci.h index 30eec93a845..52a29f7668e 100644 --- a/include/asm-x86/pci.h +++ b/include/asm-x86/pci.h @@ -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, -- 2.41.1