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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
30edc14b KRW |
2 | /* |
3 | * PCI Backend - Common data structures for overriding the configuration space | |
4 | * | |
5 | * Author: Ryan Wilson <hap9@epoch.ncsc.mil> | |
6 | */ | |
7 | ||
8 | #ifndef __XEN_PCIBACK_CONF_SPACE_H__ | |
9 | #define __XEN_PCIBACK_CONF_SPACE_H__ | |
10 | ||
11 | #include <linux/list.h> | |
12 | #include <linux/err.h> | |
13 | ||
14 | /* conf_field_init can return an errno in a ptr with ERR_PTR() */ | |
15 | typedef void *(*conf_field_init) (struct pci_dev *dev, int offset); | |
16 | typedef void (*conf_field_reset) (struct pci_dev *dev, int offset, void *data); | |
17 | typedef void (*conf_field_free) (struct pci_dev *dev, int offset, void *data); | |
18 | ||
19 | typedef int (*conf_dword_write) (struct pci_dev *dev, int offset, u32 value, | |
20 | void *data); | |
21 | typedef int (*conf_word_write) (struct pci_dev *dev, int offset, u16 value, | |
22 | void *data); | |
23 | typedef int (*conf_byte_write) (struct pci_dev *dev, int offset, u8 value, | |
24 | void *data); | |
25 | typedef int (*conf_dword_read) (struct pci_dev *dev, int offset, u32 *value, | |
26 | void *data); | |
27 | typedef int (*conf_word_read) (struct pci_dev *dev, int offset, u16 *value, | |
28 | void *data); | |
29 | typedef int (*conf_byte_read) (struct pci_dev *dev, int offset, u8 *value, | |
30 | void *data); | |
31 | ||
32 | /* These are the fields within the configuration space which we | |
33 | * are interested in intercepting reads/writes to and changing their | |
34 | * values. | |
35 | */ | |
36 | struct config_field { | |
37 | unsigned int offset; | |
38 | unsigned int size; | |
39 | unsigned int mask; | |
40 | conf_field_init init; | |
41 | conf_field_reset reset; | |
42 | conf_field_free release; | |
43 | void (*clean) (struct config_field *field); | |
44 | union { | |
45 | struct { | |
46 | conf_dword_write write; | |
47 | conf_dword_read read; | |
48 | } dw; | |
49 | struct { | |
50 | conf_word_write write; | |
51 | conf_word_read read; | |
52 | } w; | |
53 | struct { | |
54 | conf_byte_write write; | |
55 | conf_byte_read read; | |
56 | } b; | |
57 | } u; | |
58 | struct list_head list; | |
59 | }; | |
60 | ||
61 | struct config_field_entry { | |
62 | struct list_head list; | |
63 | const struct config_field *field; | |
64 | unsigned int base_offset; | |
65 | void *data; | |
66 | }; | |
67 | ||
8014bcc8 | 68 | extern bool xen_pcibk_permissive; |
af6fc858 | 69 | |
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70 | #define OFFSET(cfg_entry) ((cfg_entry)->base_offset+(cfg_entry)->field->offset) |
71 | ||
72 | /* Add fields to a device - the add_fields macro expects to get a pointer to | |
73 | * the first entry in an array (of which the ending is marked by size==0) | |
74 | */ | |
a92336a1 | 75 | int xen_pcibk_config_add_field_offset(struct pci_dev *dev, |
30edc14b KRW |
76 | const struct config_field *field, |
77 | unsigned int offset); | |
78 | ||
a92336a1 | 79 | static inline int xen_pcibk_config_add_field(struct pci_dev *dev, |
30edc14b KRW |
80 | const struct config_field *field) |
81 | { | |
a92336a1 | 82 | return xen_pcibk_config_add_field_offset(dev, field, 0); |
30edc14b KRW |
83 | } |
84 | ||
a92336a1 | 85 | static inline int xen_pcibk_config_add_fields(struct pci_dev *dev, |
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86 | const struct config_field *field) |
87 | { | |
88 | int i, err = 0; | |
89 | for (i = 0; field[i].size != 0; i++) { | |
a92336a1 | 90 | err = xen_pcibk_config_add_field(dev, &field[i]); |
30edc14b KRW |
91 | if (err) |
92 | break; | |
93 | } | |
94 | return err; | |
95 | } | |
96 | ||
a92336a1 | 97 | static inline int xen_pcibk_config_add_fields_offset(struct pci_dev *dev, |
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98 | const struct config_field *field, |
99 | unsigned int offset) | |
100 | { | |
101 | int i, err = 0; | |
102 | for (i = 0; field[i].size != 0; i++) { | |
a92336a1 | 103 | err = xen_pcibk_config_add_field_offset(dev, &field[i], offset); |
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104 | if (err) |
105 | break; | |
106 | } | |
107 | return err; | |
108 | } | |
109 | ||
110 | /* Read/Write the real configuration space */ | |
a92336a1 | 111 | int xen_pcibk_read_config_byte(struct pci_dev *dev, int offset, u8 *value, |
30edc14b | 112 | void *data); |
a92336a1 KRW |
113 | int xen_pcibk_read_config_word(struct pci_dev *dev, int offset, u16 *value, |
114 | void *data); | |
115 | int xen_pcibk_read_config_dword(struct pci_dev *dev, int offset, u32 *value, | |
116 | void *data); | |
117 | int xen_pcibk_write_config_byte(struct pci_dev *dev, int offset, u8 value, | |
118 | void *data); | |
119 | int xen_pcibk_write_config_word(struct pci_dev *dev, int offset, u16 value, | |
120 | void *data); | |
121 | int xen_pcibk_write_config_dword(struct pci_dev *dev, int offset, u32 value, | |
122 | void *data); | |
30edc14b | 123 | |
a92336a1 | 124 | int xen_pcibk_config_capability_init(void); |
30edc14b | 125 | |
a92336a1 KRW |
126 | int xen_pcibk_config_header_add_fields(struct pci_dev *dev); |
127 | int xen_pcibk_config_capability_add_fields(struct pci_dev *dev); | |
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128 | |
129 | #endif /* __XEN_PCIBACK_CONF_SPACE_H__ */ |