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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/* Copyright (c) 2024 NVIDIA Corporation & Affiliates */
3#ifndef LINUX_HMM_DMA_H
4#define LINUX_HMM_DMA_H
5
6#include <linux/dma-mapping.h>
7
8struct dma_iova_state;
9struct pci_p2pdma_map_state;
10
11/*
12 * struct hmm_dma_map - array of PFNs and DMA addresses
13 *
14 * @state: DMA IOVA state
15 * @pfns: array of PFNs
16 * @dma_list: array of DMA addresses
17 * @dma_entry_size: size of each DMA entry in the array
18 */
19struct hmm_dma_map {
20 struct dma_iova_state state;
21 unsigned long *pfn_list;
22 dma_addr_t *dma_list;
23 size_t dma_entry_size;
24};
25
26int hmm_dma_map_alloc(struct device *dev, struct hmm_dma_map *map,
27 size_t nr_entries, size_t dma_entry_size);
28void hmm_dma_map_free(struct device *dev, struct hmm_dma_map *map);
29dma_addr_t hmm_dma_map_pfn(struct device *dev, struct hmm_dma_map *map,
30 size_t idx,
31 struct pci_p2pdma_map_state *p2pdma_state);
32bool hmm_dma_unmap_pfn(struct device *dev, struct hmm_dma_map *map, size_t idx);
33#endif /* LINUX_HMM_DMA_H */