| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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| 2 | /* Copyright (c) 2024 NVIDIA Corporation & Affiliates */ |
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| 3 | #ifndef LINUX_HMM_DMA_H |
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| 4 | #define LINUX_HMM_DMA_H |
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| 5 | |
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| 6 | #include <linux/dma-mapping.h> |
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| 7 | |
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| 8 | struct dma_iova_state; |
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| 9 | struct pci_p2pdma_map_state; |
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| 10 | |
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| 11 | /* |
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| 12 | * struct hmm_dma_map - array of PFNs and DMA addresses |
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| 13 | * |
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| 14 | * @state: DMA IOVA state |
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| 15 | * @pfns: array of PFNs |
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| 16 | * @dma_list: array of DMA addresses |
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| 17 | * @dma_entry_size: size of each DMA entry in the array |
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| 18 | */ |
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| 19 | struct hmm_dma_map { |
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| 20 | struct dma_iova_state state; |
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| 21 | unsigned long *pfn_list; |
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| 22 | dma_addr_t *dma_list; |
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| 23 | size_t dma_entry_size; |
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| 24 | }; |
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| 25 | |
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| 26 | int hmm_dma_map_alloc(struct device *dev, struct hmm_dma_map *map, |
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| 27 | size_t nr_entries, size_t dma_entry_size); |
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| 28 | void hmm_dma_map_free(struct device *dev, struct hmm_dma_map *map); |
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| 29 | dma_addr_t hmm_dma_map_pfn(struct device *dev, struct hmm_dma_map *map, |
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| 30 | size_t idx, |
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| 31 | struct pci_p2pdma_map_state *p2pdma_state); |
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| 32 | bool hmm_dma_unmap_pfn(struct device *dev, struct hmm_dma_map *map, size_t idx); |
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| 33 | #endif /* LINUX_HMM_DMA_H */ |
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| 34 | |
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