• Prarit Bhargava's avatar
    x86/PCI: Mark Broadwell-EP Home Agent 1 as having non-compliant BARs · da77b671
    Prarit Bhargava authored
    Commit b8941571 ("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: b8941571 ("x86/PCI: Mark Broadwell-EP Home Agent & PCU as having non-compliant BARs")
    Signed-off-by: default avatarPrarit Bhargava <prarit@redhat.com>
    Signed-off-by: default avatarBjorn 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>
    da77b671
fixup.c 18.6 KB