include/linux/iommu-dma.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (c) 2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved
   4  *
   5  * DMA operations that map physical memory through IOMMU.
   6  */
   7 #ifndef _LINUX_IOMMU_DMA_H
   8 #define _LINUX_IOMMU_DMA_H
   9
  10 #include <linux/dma-direction.h>
  11
  12 #ifdef CONFIG_IOMMU_DMA
  13 static inline bool use_dma_iommu(struct device *dev)
  14 {
  15         return dev->dma_iommu;
  16 }
  17 #else
  18 static inline bool use_dma_iommu(struct device *dev)
  19 {
  20         return false;
  21 }
  22 #endif /* CONFIG_IOMMU_DMA */
  23
  24 dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
  25                 unsigned long offset, size_t size, enum dma_data_direction dir,
  26                 unsigned long attrs);
  27 void iommu_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
  28                 size_t size, enum dma_data_direction dir, unsigned long attrs);
  29 int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  30                 enum dma_data_direction dir, unsigned long attrs);
  31 void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
  32                 enum dma_data_direction dir, unsigned long attrs);
  33 void *iommu_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
  34                 gfp_t gfp, unsigned long attrs);
  35 int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
  36                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
  37                 unsigned long attrs);
  38 int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
  39                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
  40                 unsigned long attrs);
  41 unsigned long iommu_dma_get_merge_boundary(struct device *dev);
  42 size_t iommu_dma_opt_mapping_size(void);
  43 size_t iommu_dma_max_mapping_size(struct device *dev);
  44 void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
  45                 dma_addr_t handle, unsigned long attrs);
  46 dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys,
  47                 size_t size, enum dma_data_direction dir, unsigned long attrs);
  48 void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
  49                 size_t size, enum dma_data_direction dir, unsigned long attrs);
  50 struct sg_table *iommu_dma_alloc_noncontiguous(struct device *dev, size_t size,
  51                 enum dma_data_direction dir, gfp_t gfp, unsigned long attrs);
  52 void iommu_dma_free_noncontiguous(struct device *dev, size_t size,
  53                 struct sg_table *sgt, enum dma_data_direction dir);
  54 void *iommu_dma_vmap_noncontiguous(struct device *dev, size_t size,
  55                 struct sg_table *sgt);
  56 #define iommu_dma_vunmap_noncontiguous(dev, vaddr) \
  57         vunmap(vaddr);
  58 int iommu_dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
  59                 size_t size, struct sg_table *sgt);
  60 void iommu_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
  61                 size_t size, enum dma_data_direction dir);
  62 void iommu_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
  63                 size_t size, enum dma_data_direction dir);
  64 void iommu_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl,
  65                 int nelems, enum dma_data_direction dir);
  66 void iommu_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
  67                 int nelems, enum dma_data_direction dir);
  68
  69 #endif /* _LINUX_IOMMU_DMA_H */