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);
33 int pci_p2pdma_enable_store(const char *page, struct pci_dev **p2p_dev,
34 bool *use_p2pdma);
35 ssize_t pci_p2pdma_enable_show(char *page, struct pci_dev *p2p_dev,
36 bool use_p2pdma);
37 #else /* CONFIG_PCI_P2PDMA */
38 static inline int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar,
39 size_t size, u64 offset)
40 {
41 return -EOPNOTSUPP;
42 }
43 static inline int pci_p2pdma_distance_many(struct pci_dev *provider,
44 struct device **clients, int num_clients, bool verbose)
45 {
46 return -1;
47 }
48 static inline bool pci_has_p2pmem(struct pci_dev *pdev)
49 {
50 return false;
51 }
52 static inline struct pci_dev *pci_p2pmem_find_many(struct device **clients,
53 int num_clients)
54 {
55 return NULL;
56 }
57 static inline void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size)
58 {
59 return NULL;
60 }
61 static inline void pci_free_p2pmem(struct pci_dev *pdev, void *addr,
62 size_t size)
63 {
64 }
65 static inline pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev *pdev,
66 void *addr)
67 {
68 return 0;
69 }
70 static inline struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev,
71 unsigned int *nents, u32 length)
72 {
73 return NULL;
74 }
75 static inline void pci_p2pmem_free_sgl(struct pci_dev *pdev,
76 struct scatterlist *sgl)
77 {
78 }
79 static inline void pci_p2pmem_publish(struct pci_dev *pdev, bool publish)
80 {
81 }
82 static inline int pci_p2pdma_enable_store(const char *page,
83 struct pci_dev **p2p_dev, bool *use_p2pdma)
84 {
85 *use_p2pdma = false;
86 return 0;
87 }
88 static inline ssize_t pci_p2pdma_enable_show(char *page,
89 struct pci_dev *p2p_dev, bool use_p2pdma)
90 {
91 return sprintf(page, "none\n");
92 }
93 #endif /* CONFIG_PCI_P2PDMA */
94
95
96 static inline int pci_p2pdma_distance(struct pci_dev *provider,
97 struct device *client, bool verbose)
98 {
99 return pci_p2pdma_distance_many(provider, &client, 1, verbose);
100 }
101
102 static inline struct pci_dev *pci_p2pmem_find(struct device *client)
103 {
104 return pci_p2pmem_find_many(&client, 1);
105 }
106
107 #endif /* _LINUX_PCI_P2P_H */
108
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