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    cxl: Fix PSL error due to duplicate segment table entries · eb01d4c2
    Ian Munsie 提交于
    In certain circumstances the PSL (Power Service Layer, which provides
    translation services for CXL hardware) can send an interrupt for a
    segment miss that the kernel has already handled. This can happen if
    multiple translations for the same segment are queued in the PSL before
    the kernel has restarted the first translation.
    
    The CXL driver does not expect this situation and does not check if a
    segment had already been handled. This could cause a duplicate segment
    table entry which in turn caused a PSL error taking down the card.
    
    This patch fixes the issue by checking for existing entries in the
    segment table that match the segment we are trying to insert, so as to
    avoid inserting duplicate entries.
    Signed-off-by: NIan Munsie <imunsie@au1.ibm.com>
    Reviewed-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
    Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
    eb01d4c2
fault.c 6.9 KB