1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 /*
3 * PCI Peer 2 Peer DMA support.
4 *
5 * Copyright (c) 2016-2018, Logan Gunthorpe
6 * Copyright (c) 2016-2017, Microsemi Corporat
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 *pd
21 u64 offset);
22 int pci_p2pdma_distance_many(struct pci_dev *p
23 int num_clients,
24 bool pci_has_p2pmem(struct pci_dev *pdev);
25 struct pci_dev *pci_p2pmem_find_many(struct de
26 void *pci_alloc_p2pmem(struct pci_dev *pdev, s
27 void pci_free_p2pmem(struct pci_dev *pdev, voi
28 pci_bus_addr_t pci_p2pmem_virt_to_bus(struct p
29 struct scatterlist *pci_p2pmem_alloc_sgl(struc
30 unsig
31 void pci_p2pmem_free_sgl(struct pci_dev *pdev,
32 void pci_p2pmem_publish(struct pci_dev *pdev,
33 int pci_p2pdma_enable_store(const char *page,
34 bool *use_p2pdma);
35 ssize_t pci_p2pdma_enable_show(char *page, str
36 bool use_p2pdma
37 #else /* CONFIG_PCI_P2PDMA */
38 static inline int pci_p2pdma_add_resource(stru
39 size_t size, u64 offset)
40 {
41 return -EOPNOTSUPP;
42 }
43 static inline int pci_p2pdma_distance_many(str
44 struct device **clients, int num_clien
45 {
46 return -1;
47 }
48 static inline bool pci_has_p2pmem(struct pci_d
49 {
50 return false;
51 }
52 static inline struct pci_dev *pci_p2pmem_find_
53
54 {
55 return NULL;
56 }
57 static inline void *pci_alloc_p2pmem(struct pc
58 {
59 return NULL;
60 }
61 static inline void pci_free_p2pmem(struct pci_
62 size_t size)
63 {
64 }
65 static inline pci_bus_addr_t pci_p2pmem_virt_t
66
67 {
68 return 0;
69 }
70 static inline struct scatterlist *pci_p2pmem_a
71 unsigned int *nents, u32 lengt
72 {
73 return NULL;
74 }
75 static inline void pci_p2pmem_free_sgl(struct
76 struct scatterlist *sgl)
77 {
78 }
79 static inline void pci_p2pmem_publish(struct p
80 {
81 }
82 static inline int pci_p2pdma_enable_store(cons
83 struct pci_dev **p2p_dev, bool
84 {
85 *use_p2pdma = false;
86 return 0;
87 }
88 static inline ssize_t pci_p2pdma_enable_show(c
89 struct pci_dev *p2p_dev, bool
90 {
91 return sprintf(page, "none\n");
92 }
93 #endif /* CONFIG_PCI_P2PDMA */
94
95
96 static inline int pci_p2pdma_distance(struct p
97 struct device *client, bool verbose)
98 {
99 return pci_p2pdma_distance_many(provid
100 }
101
102 static inline struct pci_dev *pci_p2pmem_find(
103 {
104 return pci_p2pmem_find_many(&client, 1
105 }
106
107 #endif /* _LINUX_PCI_P2P_H */
108
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