arch/arm/include/asm/dma-iommu.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef ASMARM_DMA_IOMMU_H
   3 #define ASMARM_DMA_IOMMU_H
   4
   5 #ifdef __KERNEL__
   6
   7 #include <linux/mm_types.h>
   8 #include <linux/scatterlist.h>
   9 #include <linux/kref.h>
  10
  11 struct dma_iommu_mapping {
  12         /* iommu specific data */
  13         struct iommu_domain     *domain;
  14
  15         unsigned long           **bitmaps;      /* array of bitmaps */
  16         unsigned int            nr_bitmaps;     /* nr of elements in array */
  17         unsigned int            extensions;
  18         size_t                  bitmap_size;    /* size of a single bitmap */
  19         size_t                  bits;           /* per bitmap */
  20         dma_addr_t              base;
  21
  22         spinlock_t              lock;
  23         struct kref             kref;
  24 };
  25
  26 struct dma_iommu_mapping *
  27 arm_iommu_create_mapping(struct device *dev, dma_addr_t base, u64 size);
  28
  29 void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping);
  30
  31 int arm_iommu_attach_device(struct device *dev,
  32                                         struct dma_iommu_mapping *mapping);
  33 void arm_iommu_detach_device(struct device *dev);
  34
  35 #endif /* __KERNEL__ */
  36 #endif