| From | Greg Kroah-Hartman <> | Subject | [ 166/218] x86: Fix boot on Twinhead H12Y | Date | Fri, 28 Sep 2012 13:16:23 -0700 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Alan Cox <alan@linux.intel.com>
commit 80b3e557371205566a71e569fbfcce5b11f92dbe upstream.
Despite lots of investigation into why this is needed we don't know or have an elegant cure. The only answer found on this laptop is to mark a problem region as used so that Linux doesn't put anything there.
Currently all the users add reserve= command lines and anyone not knowing this needs to find the magic page that documents it. Automate it instead.
Signed-off-by: Alan Cox <alan@linux.intel.com> Tested-and-bugfixed-by: Arne Fitzenreiter <arne@fitzenreiter.de> Resolves-bug: https://bugzilla.kernel.org/show_bug.cgi?id=10231 Link: http://lkml.kernel.org/r/20120515174347.5109.94551.stgit@bluebook Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/x86/pci/fixup.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
--- a/arch/x86/pci/fixup.c +++ b/arch/x86/pci/fixup.c @@ -519,3 +519,20 @@ static void sb600_disable_hpet_bar(struc } } DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ATI, 0x4385, sb600_disable_hpet_bar); + +/* + * Twinhead H12Y needs us to block out a region otherwise we map devices + * there and any access kills the box. + * + * See: https://bugzilla.kernel.org/show_bug.cgi?id=10231 + * + * Match off the LPC and svid/sdid (older kernels lose the bridge subvendor) + */ +static void __devinit twinhead_reserve_killing_zone(struct pci_dev *dev) +{ + if (dev->subsystem_vendor == 0x14FF && dev->subsystem_device == 0xA003) { + pr_info("Reserving memory on Twinhead H12Y\n"); + request_mem_region(0xFFB00000, 0x100000, "twinhead"); + } +} +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x27B9, twinhead_reserve_killing_zone);
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