Re: [PATCH v3] irq_remap: disable IRQ remapping if any IOAPIC lacksan IOMMU

[Yinghai Lu]

On Wed, Aug 8, 2012 at 6:27 AM, Seth Forshee <seth.forshee@xxxxxxxxxxxxx> 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@xxxxxxxxxx>
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