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    Subject[PATCH 1/4] dma-direct: Provide function to check physical memory area validity
    Date
    dma_coherent_ok() checks if a physical memory area fits a device's DMA
    constraints.

    Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
    ---
    include/linux/dma-direct.h | 1 +
    kernel/dma/direct.c | 2 +-
    2 files changed, 2 insertions(+), 1 deletion(-)

    diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
    index cdfa400f89b3..cb23a8305132 100644
    --- a/include/linux/dma-direct.h
    +++ b/include/linux/dma-direct.h
    @@ -69,6 +69,7 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
    u64 dma_direct_get_required_mask(struct device *dev);
    gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
    u64 *phys_mask);
    +bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size);
    void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
    gfp_t gfp, unsigned long attrs);
    void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
    diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
    index 93f578a8e613..4de864cacd22 100644
    --- a/kernel/dma/direct.c
    +++ b/kernel/dma/direct.c
    @@ -70,7 +70,7 @@ gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
    return 0;
    }

    -static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
    +bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
    {
    return phys_to_dma_direct(dev, phys) + size - 1 <=
    min_not_zero(dev->coherent_dma_mask, dev->bus_dma_limit);
    --
    2.27.0
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