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    Subject[PATCH v4 11/14] swiotlb: Add is_dev_swiotlb_force()
    Date
    Add is_dev_swiotlb_force() which returns true if the device has
    restricted DMA pool (e.g. dev->dev_swiotlb is set).

    Signed-off-by: Claire Chang <tientzu@chromium.org>
    ---
    include/linux/swiotlb.h | 9 +++++++++
    kernel/dma/swiotlb.c | 5 +++++
    2 files changed, 14 insertions(+)

    diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
    index 76f86c684524..b9f2a250c8da 100644
    --- a/include/linux/swiotlb.h
    +++ b/include/linux/swiotlb.h
    @@ -73,11 +73,16 @@ extern enum swiotlb_force swiotlb_force;

    #ifdef CONFIG_DMA_RESTRICTED_POOL
    bool is_swiotlb_force(struct device *dev);
    +bool is_dev_swiotlb_force(struct device *dev);
    #else
    static inline bool is_swiotlb_force(struct device *dev)
    {
    return unlikely(swiotlb_force == SWIOTLB_FORCE);
    }
    +static inline bool is_dev_swiotlb_force(struct device *dev)
    +{
    + return false;
    +}
    #endif /* CONFIG_DMA_RESTRICTED_POOL */

    bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr);
    @@ -93,6 +98,10 @@ static inline bool is_swiotlb_force(struct device *dev)
    {
    return false;
    }
    +static inline bool is_dev_swiotlb_force(struct device *dev)
    +{
    + return false;
    +}
    static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr)
    {
    return false;
    diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
    index f64cbe6e84cc..fd9c1bd183ac 100644
    --- a/kernel/dma/swiotlb.c
    +++ b/kernel/dma/swiotlb.c
    @@ -841,6 +841,11 @@ bool is_swiotlb_force(struct device *dev)
    return unlikely(swiotlb_force == SWIOTLB_FORCE) || dev->dev_swiotlb;
    }

    +bool is_dev_swiotlb_force(struct device *dev)
    +{
    + return dev->dev_swiotlb;
    +}
    +
    static int rmem_swiotlb_device_init(struct reserved_mem *rmem,
    struct device *dev)
    {
    --
    2.30.0.478.g8a0d178c01-goog
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