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    Subject[PATCH 08/19] swiotlb-xen: Don't allocate DMA-memory beyond 4GB in 32-bit mode.
    Date
    From: Ronny.Hegewald@online.de <Ronny.Hegewald@online.de>

    When running in 32-bit PV environment various drivers try to allocate
    a coherent DMA memory and the Xen SWIOTLB would return memory beyond 4GB.

    On bare-metal the coherent DMA-memory using the native SWIOTLB would
    always allocate memory inside the 32-bit address-range by calling
    dma_alloc_coherent_mask.

    The attached patch adds the same functionality to Xen SWIOTLB.

    Signed-off-by: Ronny Hegewald <Ronny.Hegewald@online.de>
    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    ---
    lib/swiotlb-xen.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/lib/swiotlb-xen.c b/lib/swiotlb-xen.c
    index 89443e4..2ebfcbd 100644
    --- a/lib/swiotlb-xen.c
    +++ b/lib/swiotlb-xen.c
    @@ -150,7 +150,7 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
    ret = (void *)vstart;

    if (hwdev && hwdev->coherent_dma_mask)
    - dma_mask = hwdev->coherent_dma_mask;
    + dma_mask = dma_alloc_coherent_mask(hwdev, flags);

    if (ret) {
    if (xen_create_contiguous_region(vstart, order,
    --
    1.7.0.1


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