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/dma-debug.h>
  10 #include <linux/kmemcheck.h>
  11 #include <linux/kref.h>
  12
  13 #define ARM_MAPPING_ERROR               (~(dma_addr_t)0x0)
  14
  15 struct dma_iommu_mapping {
  16         /* iommu specific data */
  17         struct iommu_domain     *domain;
  18
  19         unsigned long           **bitmaps;      /* array of bitmaps */
  20         unsigned int            nr_bitmaps;     /* nr of elements in array */
  21         unsigned int            extensions;
  22         size_t                  bitmap_size;    /* size of a single bitmap */
  23         size_t                  bits;           /* per bitmap */
  24         dma_addr_t              base;
  25
  26         spinlock_t              lock;
  27         struct kref             kref;
  28 };
  29
  30 struct dma_iommu_mapping *
  31 arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 size);
  32
  33 void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping);
  34
  35 int arm_iommu_attach_device(struct device *dev,
  36                                         struct dma_iommu_mapping *mapping);
  37 void arm_iommu_detach_device(struct device *dev);
  38
  39 int arm_dma_supported(struct device *dev, u64 mask);
  40
  41 #endif /* __KERNEL__ */
  42 #endif