Messages in this thread | | | Date | Wed, 8 Aug 2012 10:57:06 -0700 | Subject | Re: [PATCH v3] irq_remap: disable IRQ remapping if any IOAPIC lacks an IOMMU | From | Yinghai Lu <> |
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On Wed, Aug 8, 2012 at 6:27 AM, Seth Forshee <seth.forshee@canonical.com> wrote: > The ACPI tables in the Macbook Air 5,1 define a single IOAPIC with id 2, > but the only remapping unit described in the DMAR table matches id 0. > Interrupt remapping fails as a result, and the kernel panics with the > message "timer doesn't work through Interrupt-remapped IO-APIC." > > To fix this, check each IOAPIC for a corresponding IOMMU. If an IOMMU is > not found, do not allow IRQ remapping to be enabled. > > v2: Move check to parse_ioapics_under_ir(), raise log level to KERN_ERR, > and add FW_BUG to the log message > v3: Skip check if IOMMU doesn't support interrupt remapping and remove > existing check that the IOMMU count equals the IOAPIC count >
Acked-by: Yinghai Lu <yinghai@kernel.org>
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