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| author | Prarit Bhargava <prarit@redhat.com> | 2016-05-11 18:27:15 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-05-16 22:47:51 +0200 |
| commit | da77b67195de1c65bef4908fa29967c4d0af2da2 (patch) | |
| tree | 2589259f523bb4df025fdd3eca7b3dfc9ca65ec0 /arch/x86/pci | |
| parent | PCI: Identify Enhanced Allocation (EA) BAR Equivalent resources in sysfs (diff) | |
| download | linux-da77b67195de1c65bef4908fa29967c4d0af2da2.tar.xz linux-da77b67195de1c65bef4908fa29967c4d0af2da2.zip | |
x86/PCI: Mark Broadwell-EP Home Agent 1 as having non-compliant BARs
Commit b894157145e4 ("x86/PCI: Mark Broadwell-EP Home Agent & PCU as having
non-compliant BARs") marked Home Agent 0 & PCU has having non-compliant
BARs. Home Agent 1 also has non-compliant BARs.
Mark Home Agent 1 as having non-compliant BARs so the PCI core doesn't
touch them.
The problem with these devices is documented in the Xeon v4 specification
update:
BDF2 PCI BARs in the Home Agent Will Return Non-Zero Values
During Enumeration
Problem: During system initialization the Operating System may access
the standard PCI BARs (Base Address Registers). Due to
this erratum, accesses to the Home Agent BAR registers (Bus
1; Device 18; Function 0,4; Offsets (0x14-0x24) will return
non-zero values.
Implication: The operating system may issue a warning. Intel has not
observed any functional failures due to this erratum.
Link: http://www.intel.com/content/www/us/en/processors/xeon/xeon-e5-v4-spec-update.html
Fixes: b894157145e4 ("x86/PCI: Mark Broadwell-EP Home Agent & PCU as having non-compliant BARs")
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@redhat.com>
CC: "H. Peter Anvin" <hpa@zytor.com>
CC: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'arch/x86/pci')
| -rw-r--r-- | arch/x86/pci/fixup.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c index b7de1929714b..837ea36a837d 100644 --- a/arch/x86/pci/fixup.c +++ b/arch/x86/pci/fixup.c @@ -552,9 +552,16 @@ static void twinhead_reserve_killing_zone(struct pci_dev *dev) } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x27B9, twinhead_reserve_killing_zone); +/* + * Broadwell EP Home Agent BARs erroneously return non-zero values when read. + * + * See http://www.intel.com/content/www/us/en/processors/xeon/xeon-e5-v4-spec-update.html + * entry BDF2. + */ static void pci_bdwep_bar(struct pci_dev *dev) { dev->non_compliant_bars = 1; } +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6f60, pci_bdwep_bar); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6fa0, pci_bdwep_bar); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x6fc0, pci_bdwep_bar); |