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
13static inline bool use_dma_iommu(struct device *dev)
14{
15	return dev->dma_iommu;
16}
17#else
18static inline bool use_dma_iommu(struct device *dev)
19{
20	return false;
21}
22#endif /* CONFIG_IOMMU_DMA */
23
24dma_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);
26void iommu_dma_unmap_phys(struct device *dev, dma_addr_t dma_handle,
27		size_t size, enum dma_data_direction dir, unsigned long attrs);
28int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
29		enum dma_data_direction dir, unsigned long attrs);
30void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
31		enum dma_data_direction dir, unsigned long attrs);
32void *iommu_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
33		gfp_t gfp, unsigned long attrs);
34int 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);
37int 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);
40unsigned long iommu_dma_get_merge_boundary(struct device *dev);
41size_t iommu_dma_opt_mapping_size(void);
42size_t iommu_dma_max_mapping_size(struct device *dev);
43void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
44		dma_addr_t handle, unsigned long attrs);
45struct sg_table *iommu_dma_alloc_noncontiguous(struct device *dev, size_t size,
46		enum dma_data_direction dir, gfp_t gfp, unsigned long attrs);
47void iommu_dma_free_noncontiguous(struct device *dev, size_t size,
48		struct sg_table *sgt, enum dma_data_direction dir);
49void *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);
53int iommu_dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
54		size_t size, struct sg_table *sgt);
55void iommu_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
56		size_t size, enum dma_data_direction dir);
57void iommu_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
58		size_t size, enum dma_data_direction dir);
59void iommu_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl,
60		int nelems, enum dma_data_direction dir);
61void 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 */