x86, pci: introduce pci=noioapicquirk kernel cmdline option
Introduce pci=noioapicquirk kernel cmdline option to disable all boot
interrupt quirks
Signed-off-by: Stefan Assmann <sassmann@suse.de>
Signed-off-by: Olaf Dabrunz <od@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 795c487..1aebe9d 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1518,6 +1518,9 @@
nomsi [MSI] If the PCI_MSI kernel config parameter is
enabled, this kernel boot option can be used to
disable the use of MSI interrupts system-wide.
+ noioapicquirk [APIC] Disable all boot interrupt quirks.
+ Safety option to keep boot IRQs enabled. This
+ should never be necessary.
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 940185e..bc6a101 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -22,6 +22,7 @@
static int pci_bf_sort;
int pci_routeirq;
+int noioapicquirk;
int pcibios_last_bus = -1;
unsigned long pirq_table_addr;
struct pci_bus *pci_root_bus;
@@ -495,6 +496,9 @@
} else if (!strcmp(str, "skip_isa_align")) {
pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
return NULL;
+ } else if (!strcmp(str, "noioapicquirk")) {
+ noioapicquirk = 1;
+ return NULL;
}
return str;
}
diff --git a/include/asm-x86/io_apic.h b/include/asm-x86/io_apic.h
index 14f82bb..8ca0110 100644
--- a/include/asm-x86/io_apic.h
+++ b/include/asm-x86/io_apic.h
@@ -157,11 +157,15 @@
/* 1 if "noapic" boot option passed */
extern int skip_ioapic_setup;
+/* 1 if "noapic" boot option passed */
+extern int noioapicquirk;
+
/* 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;
skip_ioapic_setup = 1;
}
diff --git a/include/asm-x86/pci.h b/include/asm-x86/pci.h
index 2db14cf..30eec93 100644
--- a/include/asm-x86/pci.h
+++ b/include/asm-x86/pci.h
@@ -19,6 +19,7 @@
};
extern int pci_routeirq;
+extern int noioapicquirk;
/* 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,