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 8 struct dma_iova_state; 9 struct 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 */ 19 struct 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 26 int hmm_dma_map_alloc(struct device *dev, struct hmm_dma_map *map, 27 size_t nr_entries, size_t dma_entry_size); 28 void hmm_dma_map_free(struct device *dev, struct hmm_dma_map *map); 29 dma_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); 32 bool hmm_dma_unmap_pfn(struct device *dev, struct hmm_dma_map *map, size_t idx); 33 #endif /* LINUX_HMM_DMA_H */ 34