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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); | |
2b9f4bb2 LG |
33 | int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg, |
34 | int nents, enum dma_data_direction dir, unsigned long attrs); | |
7f73eac3 LG |
35 | void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, |
36 | int nents, enum dma_data_direction dir, unsigned long attrs); | |
2d7bc010 LG |
37 | int pci_p2pdma_enable_store(const char *page, struct pci_dev **p2p_dev, |
38 | bool *use_p2pdma); | |
39 | ssize_t pci_p2pdma_enable_show(char *page, struct pci_dev *p2p_dev, | |
40 | bool use_p2pdma); | |
52916982 LG |
41 | #else /* CONFIG_PCI_P2PDMA */ |
42 | static inline int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, | |
43 | size_t size, u64 offset) | |
44 | { | |
45 | return -EOPNOTSUPP; | |
46 | } | |
47 | static inline int pci_p2pdma_distance_many(struct pci_dev *provider, | |
48 | struct device **clients, int num_clients, bool verbose) | |
49 | { | |
50 | return -1; | |
51 | } | |
52 | static inline bool pci_has_p2pmem(struct pci_dev *pdev) | |
53 | { | |
54 | return false; | |
55 | } | |
56 | static inline struct pci_dev *pci_p2pmem_find_many(struct device **clients, | |
57 | int num_clients) | |
58 | { | |
59 | return NULL; | |
60 | } | |
61 | static inline void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size) | |
62 | { | |
63 | return NULL; | |
64 | } | |
65 | static inline void pci_free_p2pmem(struct pci_dev *pdev, void *addr, | |
66 | size_t size) | |
67 | { | |
68 | } | |
69 | static inline pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev *pdev, | |
70 | void *addr) | |
71 | { | |
72 | return 0; | |
73 | } | |
74 | static inline struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev, | |
75 | unsigned int *nents, u32 length) | |
76 | { | |
77 | return NULL; | |
78 | } | |
79 | static inline void pci_p2pmem_free_sgl(struct pci_dev *pdev, | |
80 | struct scatterlist *sgl) | |
81 | { | |
82 | } | |
83 | static inline void pci_p2pmem_publish(struct pci_dev *pdev, bool publish) | |
84 | { | |
85 | } | |
2b9f4bb2 LG |
86 | static inline int pci_p2pdma_map_sg_attrs(struct device *dev, |
87 | struct scatterlist *sg, int nents, enum dma_data_direction dir, | |
88 | unsigned long attrs) | |
977196b8 LG |
89 | { |
90 | return 0; | |
91 | } | |
7f73eac3 LG |
92 | static inline void pci_p2pdma_unmap_sg_attrs(struct device *dev, |
93 | struct scatterlist *sg, int nents, enum dma_data_direction dir, | |
94 | unsigned long attrs) | |
95 | { | |
96 | } | |
2d7bc010 LG |
97 | static inline int pci_p2pdma_enable_store(const char *page, |
98 | struct pci_dev **p2p_dev, bool *use_p2pdma) | |
99 | { | |
100 | *use_p2pdma = false; | |
101 | return 0; | |
102 | } | |
103 | static inline ssize_t pci_p2pdma_enable_show(char *page, | |
104 | struct pci_dev *p2p_dev, bool use_p2pdma) | |
105 | { | |
106 | return sprintf(page, "none\n"); | |
107 | } | |
52916982 LG |
108 | #endif /* CONFIG_PCI_P2PDMA */ |
109 | ||
110 | ||
111 | static inline int pci_p2pdma_distance(struct pci_dev *provider, | |
112 | struct device *client, bool verbose) | |
113 | { | |
114 | return pci_p2pdma_distance_many(provider, &client, 1, verbose); | |
115 | } | |
116 | ||
117 | static inline struct pci_dev *pci_p2pmem_find(struct device *client) | |
118 | { | |
119 | return pci_p2pmem_find_many(&client, 1); | |
120 | } | |
121 | ||
2b9f4bb2 LG |
122 | static inline int pci_p2pdma_map_sg(struct device *dev, struct scatterlist *sg, |
123 | int nents, enum dma_data_direction dir) | |
124 | { | |
125 | return pci_p2pdma_map_sg_attrs(dev, sg, nents, dir, 0); | |
126 | } | |
127 | ||
7f73eac3 LG |
128 | static inline void pci_p2pdma_unmap_sg(struct device *dev, |
129 | struct scatterlist *sg, int nents, enum dma_data_direction dir) | |
130 | { | |
131 | pci_p2pdma_unmap_sg_attrs(dev, sg, nents, dir, 0); | |
132 | } | |
133 | ||
52916982 | 134 | #endif /* _LINUX_PCI_P2P_H */ |