linux-kernel - Re: 2.6.29: can't resume from suspend with DMAR (intel iommu) enabled

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Date:	Wed, 25 Mar 2009 19:42:29 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Andrew Lutomirski <amluto@...il.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Kyle McMartin <kyle@...hat.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Mark Gross <mgross@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.29: can't resume from suspend with DMAR (intel iommu)
	enabled


btw., there's also the bugreport below.

	Ingo

http://bugzilla.kernel.org/show_bug.cgi?id=12940

           Summary: CONFIG_DMAR/CONFIG_DMAR_DEFAULT_ON makes the kernel
                    unbootable
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: 2.6.29
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: x86-64
        AssignedTo: platform_x86_64@...nel-bugs.osdl.org
        ReportedBy: edman007x@....com
        Regression: No


When i enable the options CONFIG_DMAR/CONFIG_DMAR_DEFAULT_ON my kernel fails to
boot. It just hangs at:

hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
hpet0: 3 comparators, 64-bit 14.318180 MHz counter

right before that i see stuff saying that the IOMMU was remapping stuff. When i
encountered this i recompiled the kernel, disabled only
CONFIG_DMAR/CONFIG_DMAR_DEFAULT_ON and my kernel worked fine.


My hardware:
Tyan i5400PW/ 2x E5410 CPUs (latest BIOS)
8GB RAM
ATI radeonhd 3870
3ware 9650se

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