linux-kernel - [PATCH 0/2 v2] Fix Broadwell-EP Home Agent & PCU non-compliant BARs

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Date:	Wed, 11 May 2016 06:52:08 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	linux-pci@...r.kernel.org
Cc:	Prarit Bhargava <prarit@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 0/2 v2] Fix Broadwell-EP Home Agent & PCU non-compliant BARs

commit b894157145e4 ("x86/PCI: Mark Broadwell-EP Home Agent & PCU as having
non-compliant BARs") marks Home Agent 0 & PCU has having non-compliant
BARs.  commit b84106b4e229 ("PCI: Disable IO/MEM decoding for devices with
non-compliant BARs") introduces a check for non_compliant_bars to avoid
assigning resources to the individual BARs for a device.

Before these commits,

pci 0000:ff:12.0: BAR 2: failed to assign [mem size 0x00000040]
pci 0000:ff:12.0: BAR 4: failed to assign [mem size 0x00000040]
pci 0000:ff:12.4: BAR 2: failed to assign [mem size 0x00000040]
pci 0000:ff:12.4: BAR 4: failed to assign [mem size 0x00000040]
pci 0000:ff:12.0: BAR 1: failed to assign [mem size 0x00000010]
pci 0000:ff:12.0: BAR 3: failed to assign [mem size 0x00000010]
pci 0000:ff:12.0: BAR 5: failed to assign [mem size 0x00000010]
pci 0000:ff:12.4: BAR 1: failed to assign [mem size 0x00000010]
pci 0000:ff:12.4: BAR 3: failed to assign [mem size 0x00000010]
pci 0000:ff:12.4: BAR 5: failed to assign [mem size 0x00000010]
pci 0000:7f:12.0: BAR 2: failed to assign [mem size 0x00000040]
pci 0000:7f:12.0: BAR 4: failed to assign [mem size 0x00000040]
pci 0000:7f:12.4: BAR 2: failed to assign [mem size 0x00000040]
pci 0000:7f:12.4: BAR 4: failed to assign [mem size 0x00000040]
pci 0000:7f:12.0: BAR 1: failed to assign [mem size 0x00000010]
pci 0000:7f:12.0: BAR 3: failed to assign [mem size 0x00000010]
pci 0000:7f:12.0: BAR 5: failed to assign [mem size 0x00000010]
pci 0000:7f:12.4: BAR 1: failed to assign [mem size 0x00000010]
pci 0000:7f:12.4: BAR 3: failed to assign [mem size 0x00000010]
pci 0000:7f:12.4: BAR 5: failed to assign [mem size 0x00000010]

After the commits, there are still "failed to assign" messages,
as well as new "failed to assign" messages for ff:12.0, ff:1e.3,
7f:12.0, and 7f:1e.3.

 pci 0000:ff:12.4: BAR 2: failed to assign [mem size 0x00000040]
 pci 0000:ff:12.4: BAR 4: failed to assign [mem size 0x00000040]
 pci 0000:ff:12.4: BAR 1: failed to assign [mem size 0x00000010]
 pci 0000:ff:12.4: BAR 3: failed to assign [mem size 0x00000010]
 pci 0000:ff:12.4: BAR 5: failed to assign [mem size 0x00000010]
 pci 0000:ff:12.0: BAR 6: failed to assign [mem size 0x00000001 pref]
 pci 0000:ff:1e.3: BAR 6: failed to assign [mem size 0x00000001 pref]
 pci 0000:7f:12.4: BAR 2: failed to assign [mem size 0x00000040]
 pci 0000:7f:12.4: BAR 4: failed to assign [mem size 0x00000040]
 pci 0000:7f:12.4: BAR 1: failed to assign [mem size 0x00000010]
 pci 0000:7f:12.4: BAR 3: failed to assign [mem size 0x00000010]
 pci 0000:7f:12.4: BAR 5: failed to assign [mem size 0x00000010]
 pci 0000:7f:12.0: BAR 6: failed to assign [mem size 0x00000001 pref]
 pci 0000:7f:1e.3: BAR 6: failed to assign [mem size 0x00000001 pref]

There are two issues that need to be fixed.  The first is that there is another
device, Home Agent 1 & PCU (device ID 0x6f60) that must also be "blacklisted"
in the same way. After applying the first patch in this patchset the log still
contains these messages:

pci 0000:ff:12.0: BAR 6: failed to assign [mem size 0x00000001 pref]
pci 0000:ff:12.4: BAR 6: failed to assign [mem size 0x00000001 pref]
pci 0000:ff:1e.3: BAR 6: failed to assign [mem size 0x00000001 pref]
pci 0000:7f:12.0: BAR 6: failed to assign [mem size 0x00000001 pref]
pci 0000:7f:12.4: BAR 6: failed to assign [mem size 0x00000001 pref]
pci 0000:7f:1e.3: BAR 6: failed to assign [mem size 0x00000001 pref]

This second patch fixes these issues by moving the non_compliant_bars_check to
pci_read_bases() where it applies to all of a device's BARs.

v2: Separate into two patches.  Applied non_compliant_bars check to
pci_read_bases().  Added additional explanation to the commit log from
the BDW errata for the Home Agent devices.

Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Cc: linux-kernel@...r.kernel.org
Cc: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Prarit Bhargava <prarit@...hat.com>

Prarit Bhargava (2):
  x86/PCI: Add pci_bdwep_bar() quirk entry for Broadwell-EP Home Agent
    1
  x86/PCI: Disable IO/MEM decoding for ROM BARs for devices with
    non-compliant BARs

 arch/x86/pci/fixup.c |    9 +++++++++
 drivers/pci/probe.c  |    6 +++---
 2 files changed, 12 insertions(+), 3 deletions(-)

-- 
1.7.9.3