ACK: [PATCH 2/2 Wily SRU] x86/PCI: Mark Broadwell-EP Home Agent & PCU as having non-compliant BARs

[Brad Figg]

On Mon, Mar 21, 2016 at 06:40:20AM -0600, tim.gardner at canonical.com wrote:
> From: Bjorn Helgaas <bhelgaas at google.com>
> 
> BugLink: http://bugs.launchpad.net/bugs/1559929
> 
> The Home Agent and PCU PCI devices in Broadwell-EP have a non-BAR register
> where a BAR should be.  We don't know what the side effects of sizing the
> "BAR" would be, and we don't know what address space the "BAR" might appear
> to describe.
> 
> Mark these devices as having non-compliant BARs so the PCI core doesn't
> touch them.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas at google.com>
> Tested-by: Andi Kleen <ak at linux.intel.com>
> CC: stable at vger.kernel.org
> (cherry picked from commit b894157145e4ac7598d7062bc93320898a5e059e)
> Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
> ---
>  arch/x86/pci/fixup.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c
> index 9a2b710..f16af96 100644
> --- a/arch/x86/pci/fixup.c
> +++ b/arch/x86/pci/fixup.c
> @@ -553,3 +553,10 @@ static void twinhead_reserve_killing_zone(struct pci_dev *dev)
>          }
>  }
>  DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x27B9, twinhead_reserve_killing_zone);
> +
> +static void pci_bdwep_bar(struct pci_dev *dev)
> +{
> +	dev->non_compliant_bars = 1;
> +}
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6fa0, pci_bdwep_bar);
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6fc0, pci_bdwep_bar);
> -- 
> 2.7.3
> 
> 
> -- 
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Clean cherry-pick

-- 
Brad Figg brad.figg at canonical.com http://www.canonical.com