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    Subject[PATCH 2/2] x86: gart alloc_coherent does virtual mapppings only when necessary
    Date
    gart alloc_coherent need to do virtual mapppings only when an
    allocated buffer is not DMA-capable for a device.

    Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
    Cc: Joerg Roedel <joerg.roedel@amd.com>
    ---
    arch/x86/kernel/pci-gart_64.c | 10 +++++++++-
    1 files changed, 9 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
    index 1b0c412..47abe43 100644
    --- a/arch/x86/kernel/pci-gart_64.c
    +++ b/arch/x86/kernel/pci-gart_64.c
    @@ -488,15 +488,23 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
    gfp_t flag)
    {
    void *vaddr;
    + dma_addr_t paddr;
    unsigned long align_mask;
    + u64 dma_mask = dma_alloc_coherent_mask(dev, flag);

    vaddr = (void *)__get_free_pages(flag | __GFP_ZERO, get_order(size));
    if (!vaddr)
    return NULL;

    + paddr = virt_to_phys(vaddr);
    + if (is_buffer_dma_capable(dma_mask, paddr, size)) {
    + *dma_addr = paddr;
    + return vaddr;
    + }
    +
    align_mask = (1UL << get_order(size)) - 1;

    - *dma_addr = dma_map_area(dev, __pa(vaddr), size, DMA_BIDIRECTIONAL,
    + *dma_addr = dma_map_area(dev, paddr, size, DMA_BIDIRECTIONAL,
    align_mask);
    flush_gart();

    --
    1.5.4.2


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