lkml.org 
[lkml]   [2007]   [Aug]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH] [2/12] x86_64: Calgary - Fix mis-handled PCI topology
    Date

    From: Murillo Fernandes Bernardes <bernarde@br.ibm.com>
    Subject: x86-64: Calgary - Fix mis-handled PCI topology

    Current code assumed that devices were directly connected to a Calgary
    bridge, as it tried to get the iommu table directly from the parent bus
    controller.

    When we have another bridge between the Calgary/CalIOC2 bridge and the
    device we should look upwards until we get to the top (Calgary/CalIOC2
    bridge), where the iommu table resides.

    Signed-off-by: Murillo Fernandes Bernardes <mfb@br.ibm.com>
    Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
    Signed-off-by: Andi Kleen <ak@suse.de>

    arch/x86_64/kernel/pci-calgary.c | 13 ++++++-------
    1 file changed, 6 insertions(+), 7 deletions(-)

    Index: linux/arch/x86_64/kernel/pci-calgary.c
    ===================================================================
    --- linux.orig/arch/x86_64/kernel/pci-calgary.c
    +++ linux/arch/x86_64/kernel/pci-calgary.c
    @@ -367,16 +367,15 @@ static inline struct iommu_table *find_i

    pdev = to_pci_dev(dev);

    - /* is the device behind a bridge? */
    - if (unlikely(pdev->bus->parent))
    - pbus = pdev->bus->parent;
    - else
    - pbus = pdev->bus;
    + pbus = pdev->bus;
    +
    + /* is the device behind a bridge? Look for the root bus */
    + while (pbus->parent)
    + pbus = pbus->parent;

    tbl = pci_iommu(pbus);

    - BUG_ON(pdev->bus->parent &&
    - (tbl->it_busno != pdev->bus->parent->number));
    + BUG_ON(tbl && (tbl->it_busno != pbus->number));

    return tbl;
    }
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/
    \
     
     \ /
      Last update: 2007-08-09 14:47    [W:9.520 / U:0.004 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site