1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * PCI Peer 2 Peer DMA support. 3 * PCI Peer 2 Peer DMA support.
4 * 4 *
5 * Copyright (c) 2016-2018, Logan Gunthorpe 5 * Copyright (c) 2016-2018, Logan Gunthorpe
6 * Copyright (c) 2016-2017, Microsemi Corporat 6 * Copyright (c) 2016-2017, Microsemi Corporation
7 * Copyright (c) 2017, Christoph Hellwig 7 * Copyright (c) 2017, Christoph Hellwig
8 * Copyright (c) 2018, Eideticom Inc. 8 * Copyright (c) 2018, Eideticom Inc.
9 */ 9 */
10 10
11 #ifndef _LINUX_PCI_P2PDMA_H 11 #ifndef _LINUX_PCI_P2PDMA_H
12 #define _LINUX_PCI_P2PDMA_H 12 #define _LINUX_PCI_P2PDMA_H
13 13
14 #include <linux/pci.h> 14 #include <linux/pci.h>
15 15
16 struct block_device; 16 struct block_device;
17 struct scatterlist; 17 struct scatterlist;
18 18
19 #ifdef CONFIG_PCI_P2PDMA 19 #ifdef CONFIG_PCI_P2PDMA
20 int pci_p2pdma_add_resource(struct pci_dev *pd 20 int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
21 u64 offset); 21 u64 offset);
22 int pci_p2pdma_distance_many(struct pci_dev *p 22 int pci_p2pdma_distance_many(struct pci_dev *provider, struct device **clients,
23 int num_clients, 23 int num_clients, bool verbose);
24 bool pci_has_p2pmem(struct pci_dev *pdev); 24 bool pci_has_p2pmem(struct pci_dev *pdev);
25 struct pci_dev *pci_p2pmem_find_many(struct de 25 struct pci_dev *pci_p2pmem_find_many(struct device **clients, int num_clients);
26 void *pci_alloc_p2pmem(struct pci_dev *pdev, s 26 void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size);
27 void pci_free_p2pmem(struct pci_dev *pdev, voi 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 p 28 pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev *pdev, void *addr);
29 struct scatterlist *pci_p2pmem_alloc_sgl(struc 29 struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev,
30 unsig 30 unsigned int *nents, u32 length);
31 void pci_p2pmem_free_sgl(struct pci_dev *pdev, 31 void pci_p2pmem_free_sgl(struct pci_dev *pdev, struct scatterlist *sgl);
32 void pci_p2pmem_publish(struct pci_dev *pdev, 32 void pci_p2pmem_publish(struct pci_dev *pdev, bool publish);
>> 33 int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
>> 34 int nents, enum dma_data_direction dir, unsigned long attrs);
>> 35 void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
>> 36 int nents, enum dma_data_direction dir, unsigned long attrs);
33 int pci_p2pdma_enable_store(const char *page, 37 int pci_p2pdma_enable_store(const char *page, struct pci_dev **p2p_dev,
34 bool *use_p2pdma); 38 bool *use_p2pdma);
35 ssize_t pci_p2pdma_enable_show(char *page, str 39 ssize_t pci_p2pdma_enable_show(char *page, struct pci_dev *p2p_dev,
36 bool use_p2pdma 40 bool use_p2pdma);
37 #else /* CONFIG_PCI_P2PDMA */ 41 #else /* CONFIG_PCI_P2PDMA */
38 static inline int pci_p2pdma_add_resource(stru 42 static inline int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar,
39 size_t size, u64 offset) 43 size_t size, u64 offset)
40 { 44 {
41 return -EOPNOTSUPP; 45 return -EOPNOTSUPP;
42 } 46 }
43 static inline int pci_p2pdma_distance_many(str 47 static inline int pci_p2pdma_distance_many(struct pci_dev *provider,
44 struct device **clients, int num_clien 48 struct device **clients, int num_clients, bool verbose)
45 { 49 {
46 return -1; 50 return -1;
47 } 51 }
48 static inline bool pci_has_p2pmem(struct pci_d 52 static inline bool pci_has_p2pmem(struct pci_dev *pdev)
49 { 53 {
50 return false; 54 return false;
51 } 55 }
52 static inline struct pci_dev *pci_p2pmem_find_ 56 static inline struct pci_dev *pci_p2pmem_find_many(struct device **clients,
53 57 int num_clients)
54 { 58 {
55 return NULL; 59 return NULL;
56 } 60 }
57 static inline void *pci_alloc_p2pmem(struct pc 61 static inline void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size)
58 { 62 {
59 return NULL; 63 return NULL;
60 } 64 }
61 static inline void pci_free_p2pmem(struct pci_ 65 static inline void pci_free_p2pmem(struct pci_dev *pdev, void *addr,
62 size_t size) 66 size_t size)
63 { 67 {
64 } 68 }
65 static inline pci_bus_addr_t pci_p2pmem_virt_t 69 static inline pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev *pdev,
66 70 void *addr)
67 { 71 {
68 return 0; 72 return 0;
69 } 73 }
70 static inline struct scatterlist *pci_p2pmem_a 74 static inline struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev,
71 unsigned int *nents, u32 lengt 75 unsigned int *nents, u32 length)
72 { 76 {
73 return NULL; 77 return NULL;
74 } 78 }
75 static inline void pci_p2pmem_free_sgl(struct 79 static inline void pci_p2pmem_free_sgl(struct pci_dev *pdev,
76 struct scatterlist *sgl) 80 struct scatterlist *sgl)
77 { 81 {
78 } 82 }
79 static inline void pci_p2pmem_publish(struct p 83 static inline void pci_p2pmem_publish(struct pci_dev *pdev, bool publish)
80 { 84 {
81 } 85 }
>> 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)
>> 89 {
>> 90 return 0;
>> 91 }
>> 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 }
82 static inline int pci_p2pdma_enable_store(cons 97 static inline int pci_p2pdma_enable_store(const char *page,
83 struct pci_dev **p2p_dev, bool 98 struct pci_dev **p2p_dev, bool *use_p2pdma)
84 { 99 {
85 *use_p2pdma = false; 100 *use_p2pdma = false;
86 return 0; 101 return 0;
87 } 102 }
88 static inline ssize_t pci_p2pdma_enable_show(c 103 static inline ssize_t pci_p2pdma_enable_show(char *page,
89 struct pci_dev *p2p_dev, bool 104 struct pci_dev *p2p_dev, bool use_p2pdma)
90 { 105 {
91 return sprintf(page, "none\n"); 106 return sprintf(page, "none\n");
92 } 107 }
93 #endif /* CONFIG_PCI_P2PDMA */ 108 #endif /* CONFIG_PCI_P2PDMA */
94 109
95 110
96 static inline int pci_p2pdma_distance(struct p 111 static inline int pci_p2pdma_distance(struct pci_dev *provider,
97 struct device *client, bool verbose) 112 struct device *client, bool verbose)
98 { 113 {
99 return pci_p2pdma_distance_many(provid 114 return pci_p2pdma_distance_many(provider, &client, 1, verbose);
100 } 115 }
101 116
102 static inline struct pci_dev *pci_p2pmem_find( 117 static inline struct pci_dev *pci_p2pmem_find(struct device *client)
103 { 118 {
104 return pci_p2pmem_find_many(&client, 1 119 return pci_p2pmem_find_many(&client, 1);
>> 120 }
>> 121
>> 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
>> 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);
105 } 132 }
106 133
107 #endif /* _LINUX_PCI_P2P_H */ 134 #endif /* _LINUX_PCI_P2P_H */
108 135
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