Patch "x86/PCI: Mark Broadwell-EP Home Agent & PCU as having non-compliant BARs" has been added to the 4.4-stable tree

Patch "x86/PCI: Mark Broadwell-EP Home Agent & PCU as having non-compliant BARs" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    x86/PCI: Mark Broadwell-EP Home Agent & PCU as having non-compliant BARs

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     x86-pci-mark-broadwell-ep-home-agent-pcu-as-having-non-compliant-bars.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From b894157145e4ac7598d7062bc93320898a5e059e Mon Sep 17 00:00:00 2001
From: Bjorn Helgaas <bhelgaas@google.com>
Date: Fri, 26 Feb 2016 09:15:11 -0600
Subject: x86/PCI: Mark Broadwell-EP Home Agent & PCU as having non-compliant BARs

From: Bjorn Helgaas <bhelgaas@google.com>

commit b894157145e4ac7598d7062bc93320898a5e059e upstream.

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@google.com>
Tested-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/pci/fixup.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/arch/x86/pci/fixup.c
+++ b/arch/x86/pci/fixup.c
@@ -540,3 +540,10 @@ static void twinhead_reserve_killing_zon
         }
 }
 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);


Patches currently in stable-queue which might be from bhelgaas@google.com are

queue-4.4/x86-pci-mark-broadwell-ep-home-agent-pcu-as-having-non-compliant-bars.patch
queue-4.4/pci-disable-io-mem-decoding-for-devices-with-non-compliant-bars.patch