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

INCLUDED FROM

   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/dma-debug.h>
  10 #include <linux/kref.h>
  11 
  12 struct dma_iommu_mapping {
  13         /* iommu specific data */
  14         struct iommu_domain     *domain;
  15 
  16         unsigned long           **bitmaps;      /* array of bitmaps */
  17         unsigned int            nr_bitmaps;     /* nr of elements in array */
  18         unsigned int            extensions;
  19         size_t                  bitmap_size;    /* size of a single bitmap */
  20         size_t                  bits;           /* per bitmap */
  21         dma_addr_t              base;
  22 
  23         spinlock_t              lock;
  24         struct kref             kref;
  25 };
  26 
  27 struct dma_iommu_mapping *
  28 arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 size);
  29 
  30 void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping);
  31 
  32 int arm_iommu_attach_device(struct device *dev,
  33                                         struct dma_iommu_mapping *mapping);
  34 void arm_iommu_detach_device(struct device *dev);
  35 
  36 int arm_dma_supported(struct device *dev, u64 mask);
  37 
  38 #endif /* __KERNEL__ */
  39 #endif