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From: Bjorn Helgaas <bhelgaas@google.com>
Date: Tue, 9 Jul 2013 15:05:39 -0600
Message-ID: <CAErSpo6Ma1TnBP-UGGhWFN1rj48y+yTS=VmVw_s30_FWgjfdpg@mail.gmail.com>
Subject: Re: WARNING: at drivers/iommu/dmar.c:484 warn_invalid_dmar with Intel Motherboard
To: Guenter Roeck <linux@roeck-us.net>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Joerg Roedel <joro@8bytes.org>,
        "open list:INTEL IOMMU (VT-d)" <iommu@lists.linux-foundation.org>,
        David Woodhouse <dwmw2@infradead.org>
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[+cc Joerg, David, iommu list]

On Tue, Jul 9, 2013 at 2:24 PM, Guenter Roeck <linux@roeck-us.net> wrote:
> I started seeing this problem after updating the BIOS trying fix another issue,
> though I may have missed it earlier.
>
> I understand this is a BIOS bug. Would be great if someone can pass this on
> to Intel BIOS engineers.

Maybe.  It'd be nice if Linux handled it better, though.

> CPU is i7-4770K.
>
> Guenter
>
> ---
>
> [    0.000000] WARNING: at drivers/iommu/dmar.c:484 warn_invalid_dmar+0x86/0xa0()
> [    0.000000] Your BIOS is broken; DMAR reported at address 0!
> [    0.000000] BIOS vendor: Intel Corp.; Ver: RLH8710H.86A.0320.2013.0606.1802; Product Version:
> [    0.000000] Modules linked in:
> [    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.10.0+ #1
> [    0.000000] Hardware name:                  /DH87RL, BIOS RLH8710H.86A.0320.2013.0606.1802 06/06/2013
> [    0.000000]  000000000000000b ffffffff81c01e20 ffffffff81671cfc ffffffff81c01e68
> [    0.000000]  ffffffff81c01e58 ffffffff81043370 ffffffff81f6800c ffffffff81cbb520
> [    0.000000]  0000000000000000 ffff88061fdaad40 00000000c73cc018 ffffffff81c01eb8
> [    0.000000] Call Trace:
> [    0.000000]  [<ffffffff81671cfc>] dump_stack+0x45/0x56
> [    0.000000]  [<ffffffff81043370>] warn_slowpath_common+0x70/0xa0
> [    0.000000]  [<ffffffff81043404>] warn_slowpath_fmt_taint+0x44/0x50
> [    0.000000]  [<ffffffff81d162eb>] ? early_ioremap+0x13/0x15
> [    0.000000]  [<ffffffff81d0d6a6>] ? __acpi_map_table+0x13/0x1a
> [    0.000000]  [<ffffffff81548bf6>] warn_invalid_dmar+0x86/0xa0
> [    0.000000]  [<ffffffff81d4b994>] check_zero_address+0x57/0xf7
> [    0.000000]  [<ffffffff81d4ba49>] detect_intel_iommu+0x15/0xb6
> [    0.000000]  [<ffffffff81d07d28>] pci_iommu_alloc+0x49/0x70
> [    0.000000]  [<ffffffff81d15de4>] mem_init+0x17/0x9c
> [    0.000000]  [<ffffffff81d01c54>] start_kernel+0x1c5/0x3e2
> [    0.000000]  [<ffffffff81d01898>] ? repair_env_string+0x5e/0x5e
> [    0.000000]  [<ffffffff81d015a3>] x86_64_start_reservations+0x2a/0x2c
> [    0.000000]  [<ffffffff81d0169b>] x86_64_start_kernel+0xf6/0xf9
> [    0.000000] ---[ end trace a7e3512e2fa85eaf ]---
> --
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