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    x86/PCI: use host bridge _CRS info on ASRock ALiveSATA2-GLAN · 2491762c
    Bjorn Helgaas 提交于
    This DMI quirk turns on "pci=use_crs" for the ALiveSATA2-GLAN because
    amd_bus.c doesn't handle this system correctly.
    
    The system has a single HyperTransport I/O chain, but has two PCI host
    bridges to buses 00 and 80.  amd_bus.c learns the MMIO range associated
    with buses 00-ff and that this range is routed to the HT chain hosted at
    node 0, link 0:
    
        bus: [00, ff] on node 0 link 0
        bus: 00 index 1 [mem 0x80000000-0xfcffffffff]
    
    This includes the address space for both bus 00 and bus 80, and amd_bus.c
    assumes it's all routed to bus 00.
    
    We find device 80:01.0, which BIOS left in the middle of that space, but
    we don't find a bridge from bus 00 to bus 80, so we conclude that 80:01.0
    is unreachable from bus 00, and we move it from the original, working,
    address to something outside the bus 00 aperture, which does not work:
    
        pci 0000:80:01.0: reg 10: [mem 0xfebfc000-0xfebfffff 64bit]
        pci 0000:80:01.0: BAR 0: assigned [mem 0xfd00000000-0xfd00003fff 64bit]
    
    The BIOS told us everything we need to know to handle this correctly,
    so we're better off if we just pay attention, which lets us leave the
    80:01.0 device at the original, working, address:
    
        ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-7f])
        pci_root PNP0A03:00: host bridge window [mem 0x80000000-0xff37ffff]
        ACPI: PCI Root Bridge [PCI1] (domain 0000 [bus 80-ff])
        pci_root PNP0A08:00: host bridge window [mem 0xfebfc000-0xfebfffff]
    
    This was a regression between 2.6.33 and 2.6.34.  In 2.6.33, amd_bus.c
    was used only when we found multiple HT chains.  3e3da00c, which
    enabled amd_bus.c even on systems with a single HT chain, caused this
    failure.
    
    This quirk was written by Graham.  If we ever enable "pci=use_crs" for
    machines from 2006 or earlir, this quirk should be removed.
    
    Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=16007
    
    Cc: stable@kernel.org
    Reported-by: NGraham Ramsey <ramsey.graham@ntlworld.com>
    Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com>
    Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
    2491762c
acpi.c 8.4 KB