• Darrick J. Wong's avatar
    x86, Calgary IOMMU quirk: Find nearest matching Calgary while walking up the PCI tree · 4528752f
    Darrick J. Wong authored
    On a multi-node x3950M2 system, there's a slight oddity in the
    PCI device tree for all secondary nodes:
    
     30:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)
      \-33:00.0 PCI bridge: IBM CalIOC2 PCI-E Root Port (rev 01)
         \-34:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 1078 (rev 04)
    
    ...as compared to the primary node:
    
     00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)
      \-01:00.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)
     03:00.0 PCI bridge: IBM CalIOC2 PCI-E Root Port (rev 01)
      \-04:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 1078 (rev 04)
    
    In both nodes, the LSI RAID controller hangs off a CalIOC2
    device, but on the secondary nodes, the BIOS hides the VGA
    device and substitutes the device tree ending with the disk
    controller.
    
    It would seem that Calgary devices don't necessarily appear at
    the top of the PCI tree, which means that the current code to
    find the Calgary IOMMU that goes with a particular device is
    buggy.
    
    Rather than walk all the way to the top of the PCI
    device tree and try to match bus number with Calgary descriptor,
    the code needs to examine each parent of the particular device;
    if it encounters a Calgary with a matching bus number, simply
    use that.
    
    Otherwise, we BUG() when the bus number of the Calgary doesn't
    match the bus number of whatever's at the top of the device tree.
    
    Extra note: This patch appears to work correctly for the x3950
    that came before the x3950 M2.
    Signed-off-by: default avatarDarrick J. Wong <djwong@us.ibm.com>
    Acked-by: default avatarMuli Ben-Yehuda <muli@il.ibm.com>
    Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
    Cc: Joerg Roedel <joerg.roedel@amd.com>
    Cc: Yinghai Lu <yhlu.kernel@gmail.com>
    Cc: Jon D. Mason <jdmason@kudzu.us>
    Cc: Corinna Schultz <coschult@us.ibm.com>
    Cc: <stable@kernel.org>
    LKML-Reference: <20091202230556.GG10295@tux1.beaverton.ibm.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    4528752f
pci-calgary_64.c 40.2 KB