From: Joerg Roedel <joro@8bytes.org>
To: Seth Forshee <seth.forshee@canonical.com>,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Len Brown <lenb@kernel.org>, Joerg Roedel <joerg.roedel@amd.com>,
Suresh Siddha <suresh.b.siddha@intel.com>,
Yinghai Lu <yinghai@kernel.org>
Subject: Re: IRQ remapping problem on Macbook Air 5,1
Date: Tue, 7 Aug 2012 22:10:30 +0200 [thread overview]
Message-ID: <20120807201030.GJ1917@8bytes.org> (raw)
In-Reply-To: <20120807194837.GB23829@thinkpad-t410>
Hi Seth,
On Tue, Aug 07, 2012 at 02:48:37PM -0500, Seth Forshee wrote:
> This machine has a bug in its ACPI tables that's causing it to fail to
> boot unless intremap=off is passed to the kernel. The MADT defines a
> single IOAPIC with id 2, but the remapping unit defined in DMAR matches
> id 0. Thus interrupt remapping fails, and the kernel panics with the
> message "timer doesn't work through Interrupt-remapped IO-APIC." If I
> force the use of the non-matching ir hardware for the IOAPIC everything
> seems to works fine. dmesg for the working boot is below.
There are AMD systems with similar problems. For example I had a system
with 2 IO-APICs but only one was described in the IOMMU ACPI table.
> I'm looking at how to make this machine able to boot by default. OS X
> obviously boots, and Windows presumably boots as well since Apple
> officially supports running Windows on its hardware.
These operating systems probably don't support interrupt remapping, or
the IOMMU at all.
> I've got a patch to leave IRQ remapping disabled whenever any IOAPIC
> does not have a matching ir hardware unit. This gets it to boot, but I
> thought I'd check and see whether anyone had any better ideas for how to
> fix this.
This is exactly how I fixed this issue on the AMD side too. Mind to
submit the patch?
Thanks,
Joerg
next prev parent reply other threads:[~2012-08-07 20:10 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-07 19:48 IRQ remapping problem on Macbook Air 5,1 Seth Forshee
2012-08-07 20:10 ` Joerg Roedel [this message]
2012-08-07 20:47 ` Suresh Siddha
2012-08-07 20:55 ` Seth Forshee
2012-08-07 20:53 ` Suresh Siddha
2012-08-07 20:48 ` [PATCH] irq_remap: disable IRQ remapping if any IOAPIC lacks an IOMMU Seth Forshee
2012-08-07 20:50 ` Suresh Siddha
2012-08-07 21:04 ` Joerg Roedel
2012-08-07 21:39 ` [PATCH v2] " Seth Forshee
2012-08-07 22:04 ` Yinghai Lu
2012-08-08 13:27 ` [PATCH v3] " Seth Forshee
2012-08-08 17:57 ` Yinghai Lu
2012-08-08 21:33 ` Seth Forshee
2012-08-10 9:32 ` Joerg Roedel
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