dma-iommu.h

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#ifndef ASMARM_DMA_IOMMU_H
#define ASMARM_DMA_IOMMU_H

#ifdef __KERNEL__

#include <linux/mm_types.h>
#include <linux/scatterlist.h>
#include <linux/dma-debug.h>
#include <linux/kmemcheck.h>

struct dma_iommu_mapping {
    /* iommu specific data */
    struct iommu_domain *domain;

    void            *bitmap;
    size_t          bits;
    unsigned int        order;
    dma_addr_t      base;

    spinlock_t      lock;
    struct kref     kref;
};

struct dma_iommu_mapping *
arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size,
             int order);

void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping);

int arm_iommu_attach_device(struct device *dev,
                    struct dma_iommu_mapping *mapping);

#endif /* __KERNEL__ */
#endif