Logan Gunthorpe | 5291698 | 2018-10-04 15:27:35 -0600 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* |
| 3 | * PCI Peer 2 Peer DMA support. |
| 4 | * |
| 5 | * Copyright (c) 2016-2018, Logan Gunthorpe |
| 6 | * Copyright (c) 2016-2017, Microsemi Corporation |
| 7 | * Copyright (c) 2017, Christoph Hellwig |
| 8 | * Copyright (c) 2018, Eideticom Inc. |
| 9 | */ |
| 10 | |
| 11 | #ifndef _LINUX_PCI_P2PDMA_H |
| 12 | #define _LINUX_PCI_P2PDMA_H |
| 13 | |
| 14 | #include <linux/pci.h> |
| 15 | |
| 16 | struct block_device; |
| 17 | struct scatterlist; |
| 18 | |
| 19 | #ifdef CONFIG_PCI_P2PDMA |
| 20 | int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, |
| 21 | u64 offset); |
| 22 | int pci_p2pdma_distance_many(struct pci_dev *provider, struct device **clients, |
| 23 | int num_clients, bool verbose); |
| 24 | bool pci_has_p2pmem(struct pci_dev *pdev); |
| 25 | struct pci_dev *pci_p2pmem_find_many(struct device **clients, int num_clients); |
| 26 | void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size); |
| 27 | void pci_free_p2pmem(struct pci_dev *pdev, void *addr, size_t size); |
| 28 | pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev *pdev, void *addr); |
| 29 | struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev, |
| 30 | unsigned int *nents, u32 length); |
| 31 | void pci_p2pmem_free_sgl(struct pci_dev *pdev, struct scatterlist *sgl); |
| 32 | void pci_p2pmem_publish(struct pci_dev *pdev, bool publish); |
Logan Gunthorpe | 977196b | 2018-10-04 15:27:37 -0600 | [diff] [blame] | 33 | int pci_p2pdma_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 34 | enum dma_data_direction dir); |
Logan Gunthorpe | 2d7bc01 | 2018-10-04 15:27:38 -0600 | [diff] [blame] | 35 | int pci_p2pdma_enable_store(const char *page, struct pci_dev **p2p_dev, |
| 36 | bool *use_p2pdma); |
| 37 | ssize_t pci_p2pdma_enable_show(char *page, struct pci_dev *p2p_dev, |
| 38 | bool use_p2pdma); |
Logan Gunthorpe | 5291698 | 2018-10-04 15:27:35 -0600 | [diff] [blame] | 39 | #else /* CONFIG_PCI_P2PDMA */ |
| 40 | static inline int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, |
| 41 | size_t size, u64 offset) |
| 42 | { |
| 43 | return -EOPNOTSUPP; |
| 44 | } |
| 45 | static inline int pci_p2pdma_distance_many(struct pci_dev *provider, |
| 46 | struct device **clients, int num_clients, bool verbose) |
| 47 | { |
| 48 | return -1; |
| 49 | } |
| 50 | static inline bool pci_has_p2pmem(struct pci_dev *pdev) |
| 51 | { |
| 52 | return false; |
| 53 | } |
| 54 | static inline struct pci_dev *pci_p2pmem_find_many(struct device **clients, |
| 55 | int num_clients) |
| 56 | { |
| 57 | return NULL; |
| 58 | } |
| 59 | static inline void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size) |
| 60 | { |
| 61 | return NULL; |
| 62 | } |
| 63 | static inline void pci_free_p2pmem(struct pci_dev *pdev, void *addr, |
| 64 | size_t size) |
| 65 | { |
| 66 | } |
| 67 | static inline pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev *pdev, |
| 68 | void *addr) |
| 69 | { |
| 70 | return 0; |
| 71 | } |
| 72 | static inline struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev, |
| 73 | unsigned int *nents, u32 length) |
| 74 | { |
| 75 | return NULL; |
| 76 | } |
| 77 | static inline void pci_p2pmem_free_sgl(struct pci_dev *pdev, |
| 78 | struct scatterlist *sgl) |
| 79 | { |
| 80 | } |
| 81 | static inline void pci_p2pmem_publish(struct pci_dev *pdev, bool publish) |
| 82 | { |
| 83 | } |
Logan Gunthorpe | 977196b | 2018-10-04 15:27:37 -0600 | [diff] [blame] | 84 | static inline int pci_p2pdma_map_sg(struct device *dev, |
| 85 | struct scatterlist *sg, int nents, enum dma_data_direction dir) |
| 86 | { |
| 87 | return 0; |
| 88 | } |
Logan Gunthorpe | 2d7bc01 | 2018-10-04 15:27:38 -0600 | [diff] [blame] | 89 | static inline int pci_p2pdma_enable_store(const char *page, |
| 90 | struct pci_dev **p2p_dev, bool *use_p2pdma) |
| 91 | { |
| 92 | *use_p2pdma = false; |
| 93 | return 0; |
| 94 | } |
| 95 | static inline ssize_t pci_p2pdma_enable_show(char *page, |
| 96 | struct pci_dev *p2p_dev, bool use_p2pdma) |
| 97 | { |
| 98 | return sprintf(page, "none\n"); |
| 99 | } |
Logan Gunthorpe | 5291698 | 2018-10-04 15:27:35 -0600 | [diff] [blame] | 100 | #endif /* CONFIG_PCI_P2PDMA */ |
| 101 | |
| 102 | |
| 103 | static inline int pci_p2pdma_distance(struct pci_dev *provider, |
| 104 | struct device *client, bool verbose) |
| 105 | { |
| 106 | return pci_p2pdma_distance_many(provider, &client, 1, verbose); |
| 107 | } |
| 108 | |
| 109 | static inline struct pci_dev *pci_p2pmem_find(struct device *client) |
| 110 | { |
| 111 | return pci_p2pmem_find_many(&client, 1); |
| 112 | } |
| 113 | |
| 114 | #endif /* _LINUX_PCI_P2P_H */ |