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52916982 LG |
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); | |
977196b8 LG |
33 | int pci_p2pdma_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
34 | enum dma_data_direction dir); | |
2d7bc010 LG |
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); | |
52916982 LG |
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 | } | |
977196b8 LG |
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 | } | |
2d7bc010 LG |
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 | } | |
52916982 LG |
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 */ |