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