linux-kernel - Re: [PATCH v3] irq_remap: disable IRQ remapping if any IOAPIC lacks an IOMMU

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Date:	Wed, 8 Aug 2012 10:57:06 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Seth Forshee <seth.forshee@...onical.com>
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	x86@...nel.org, Joerg Roedel <joro@...tes.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Len Brown <lenb@...nel.org>,
	Joerg Roedel <joerg.roedel@....com>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [PATCH v3] irq_remap: disable IRQ remapping if any IOAPIC lacks
 an IOMMU

On Wed, Aug 8, 2012 at 6:27 AM, Seth Forshee <seth.forshee@...onical.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@...nel.org>
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