• Christoph Hellwig's avatar
    swiotlb-xen: simplify cache maintainance · b4dca151
    Christoph Hellwig authored
    Now that we know we always have the dma-noncoherent.h helpers available
    if we are on an architecture with support for non-coherent devices,
    we can just call them directly, and remove the calls to the dma-direct
    routines, including the fact that we call the dma_direct_map_page
    routines but ignore the value returned from it.  Instead we now have
    Xen wrappers for the arch_sync_dma_for_{device,cpu} helpers that call
    the special Xen versions of those routines for foreign pages.
    
    Note that the new helpers get the physical address passed in addition
    to the dma address to avoid another translation for the local cache
    maintainance.  The pfn_valid checks remain on the dma address as in
    the old code, even if that looks a little funny.
    Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
    Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
    Reviewed-by: default avatarStefano Stabellini <sstabellini@kernel.org>
    Acked-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    b4dca151
mm.c 4.11 KB