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
use_dma_iommu(struct device * dev)13 static inline bool use_dma_iommu(struct device *dev)
14 {
15 return dev->dma_iommu;
16 }
17 #else
use_dma_iommu(struct device * dev)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_phys(struct device *dev, phys_addr_t phys, size_t size,
25 enum dma_data_direction dir, unsigned long attrs);
26 void iommu_dma_unmap_phys(struct device *dev, dma_addr_t dma_handle,
27 size_t size, enum dma_data_direction dir, unsigned long attrs);
28 int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
29 enum dma_data_direction dir, unsigned long attrs);
30 void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
31 enum dma_data_direction dir, unsigned long attrs);
32 void *iommu_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
33 gfp_t gfp, unsigned long attrs);
34 int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
35 void *cpu_addr, dma_addr_t dma_addr, size_t size,
36 unsigned long attrs);
37 int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
38 void *cpu_addr, dma_addr_t dma_addr, size_t size,
39 unsigned long attrs);
40 unsigned long iommu_dma_get_merge_boundary(struct device *dev);
41 size_t iommu_dma_opt_mapping_size(void);
42 size_t iommu_dma_max_mapping_size(struct device *dev);
43 void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
44 dma_addr_t handle, unsigned long attrs);
45 struct sg_table *iommu_dma_alloc_noncontiguous(struct device *dev, size_t size,
46 enum dma_data_direction dir, gfp_t gfp, unsigned long attrs);
47 void iommu_dma_free_noncontiguous(struct device *dev, size_t size,
48 struct sg_table *sgt, enum dma_data_direction dir);
49 void *iommu_dma_vmap_noncontiguous(struct device *dev, size_t size,
50 struct sg_table *sgt);
51 #define iommu_dma_vunmap_noncontiguous(dev, vaddr) \
52 vunmap(vaddr);
53 int iommu_dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
54 size_t size, struct sg_table *sgt);
55 void iommu_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
56 size_t size, enum dma_data_direction dir);
57 void iommu_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
58 size_t size, enum dma_data_direction dir);
59 void iommu_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl,
60 int nelems, enum dma_data_direction dir);
61 void iommu_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
62 int nelems, enum dma_data_direction dir);
63
64 #endif /* _LINUX_IOMMU_DMA_H */
65