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    Subject[PATCH 08/12] amd-iommu: enlarge the aperture dynamically
    Date
    [ impact: enable the new extended dma address allocator ]

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    arch/x86/kernel/amd_iommu.c | 20 ++++++++++++++++++--
    1 files changed, 18 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
    index 59ee1b9..d129d8f 100644
    --- a/arch/x86/kernel/amd_iommu.c
    +++ b/arch/x86/kernel/amd_iommu.c
    @@ -1403,10 +1403,26 @@ static dma_addr_t __map_single(struct device *dev,
    if (align)
    align_mask = (1UL << get_order(size)) - 1;

    +retry:
    address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask,
    dma_mask);
    - if (unlikely(address == bad_dma_address))
    - goto out;
    + if (unlikely(address == bad_dma_address)) {
    + /*
    + * setting next_address here will let the address
    + * allocator only scan the new allocated range in the
    + * first run. This is a small optimization.
    + */
    + dma_dom->next_address = dma_dom->aperture_size;
    +
    + if (alloc_new_range(iommu, dma_dom, false, GFP_ATOMIC))
    + goto out;
    +
    + /*
    + * aperture was sucessfully enlarged by 128 MB, try
    + * allocation again
    + */
    + goto retry;
    + }

    start = address;
    for (i = 0; i < pages; ++i) {
    --
    1.6.3.1



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