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 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1518,6 +1518,9 @@ and is between 256 and 4096 characters. It is defined in the file
                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 (file)
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -22,6 +22,7 @@ unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
 
 static int pci_bf_sort;
 int pci_routeirq;
+int noioapicquirk;
 int pcibios_last_bus = -1;
 unsigned long pirq_table_addr;
 struct pci_bus *pci_root_bus;
@@ -495,6 +496,9 @@ char * __devinit  pcibios_setup(char *str)
        } 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 (file)
--- a/include/asm-x86/io_apic.h
+++ b/include/asm-x86/io_apic.h
@@ -157,11 +157,15 @@ extern int sis_apic_bug;
 /* 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 (file)
--- a/include/asm-x86/pci.h
+++ b/include/asm-x86/pci.h
@@ -19,6 +19,7 @@ struct pci_sysdata {
 };
 
 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,