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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-07-10 14:16:56 -0400
committerIngo Molnar <mingo@elte.hu>2008-07-12 02:45:05 -0400
commit89027d35aa5b8f45ce0f7fa0911db85b46563da0 (patch)
treebf2f9570231bbd4cc2cd24247059fdb72bdee57e /include/linux/dmar.h
parent5c520a6724e912a7e6153b7597192edad6752750 (diff)
x64, x2apic/intr-remap: IO-APIC support for interrupt-remapping
IO-APIC support in the presence of interrupt-remapping infrastructure. IO-APIC RTE will be programmed with interrupt-remapping table entry(IRTE) index and the IRTE will contain information about the vector, cpu destination, trigger mode etc, which traditionally was present in the IO-APIC RTE. Introduce a new irq_chip for cleaner irq migration (in the process context as opposed to the current irq migration in the context of an interrupt. interrupt-remapping infrastructure will help us achieve this cleanly). For edge triggered, irq migration is a simple atomic update(of vector and cpu destination) of IRTE and flush the hardware cache. For level triggered, we need to modify the io-apic RTE aswell with the update vector information, along with modifying IRTE with vector and cpu destination. So irq migration for level triggered is little bit more complex compared to edge triggered migration. But the good news is, we use the same algorithm for level triggered migration as we have today, only difference being, we now initiate the irq migration from process context instead of the interrupt context. In future, when we do a directed EOI (combined with cpu EOI broadcast suppression) to the IO-APIC, level triggered irq migration will also be as simple as edge triggered migration and we can do the irq migration with a simple atomic update to IO-APIC RTE. TBD: some tests/changes needed in the presence of fixup_irqs() for level triggered irq migration. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: akpm@linux-foundation.org Cc: arjan@linux.intel.com Cc: andi@firstfloor.org Cc: ebiederm@xmission.com Cc: jbarnes@virtuousgeek.org Cc: steiner@sgi.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/dmar.h')
-rw-r--r--include/linux/dmar.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index 324bbca85a26..bf41ffa74705 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -109,6 +109,7 @@ extern int flush_irte(int irq);
109extern int free_irte(int irq); 109extern int free_irte(int irq);
110 110
111extern int irq_remapped(int irq); 111extern int irq_remapped(int irq);
112extern struct intel_iommu *map_ioapic_to_ir(int apic);
112#else 113#else
113#define irq_remapped(irq) (0) 114#define irq_remapped(irq) (0)
114#define enable_intr_remapping(mode) (-1) 115#define enable_intr_remapping(mode) (-1)