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 extern bool xen_pcibk_permissive; 68 69 #define OFFSET(cfg_entry) ((cfg_entry)->base_offset+(cfg_entry)->field->offset) 70 71 /* Add fields to a device - the add_fields macro expects to get a pointer to 72 * the first entry in an array (of which the ending is marked by size==0) 73 */ 74 int xen_pcibk_config_add_field_offset(struct pci_dev *dev, 75 const struct config_field *field, 76 unsigned int offset); 77 78 static inline int xen_pcibk_config_add_field(struct pci_dev *dev, 79 const struct config_field *field) 80 { 81 return xen_pcibk_config_add_field_offset(dev, field, 0); 82 } 83 84 static inline int xen_pcibk_config_add_fields(struct pci_dev *dev, 85 const struct config_field *field) 86 { 87 int i, err = 0; 88 for (i = 0; field[i].size != 0; i++) { 89 err = xen_pcibk_config_add_field(dev, &field[i]); 90 if (err) 91 break; 92 } 93 return err; 94 } 95 96 static inline int xen_pcibk_config_add_fields_offset(struct pci_dev *dev, 97 const struct config_field *field, 98 unsigned int offset) 99 { 100 int i, err = 0; 101 for (i = 0; field[i].size != 0; i++) { 102 err = xen_pcibk_config_add_field_offset(dev, &field[i], offset); 103 if (err) 104 break; 105 } 106 return err; 107 } 108 109 /* Read/Write the real configuration space */ 110 int xen_pcibk_read_config_byte(struct pci_dev *dev, int offset, u8 *value, 111 void *data); 112 int xen_pcibk_read_config_word(struct pci_dev *dev, int offset, u16 *value, 113 void *data); 114 int xen_pcibk_read_config_dword(struct pci_dev *dev, int offset, u32 *value, 115 void *data); 116 int xen_pcibk_write_config_byte(struct pci_dev *dev, int offset, u8 value, 117 void *data); 118 int xen_pcibk_write_config_word(struct pci_dev *dev, int offset, u16 value, 119 void *data); 120 int xen_pcibk_write_config_dword(struct pci_dev *dev, int offset, u32 value, 121 void *data); 122 123 int xen_pcibk_config_capability_init(void); 124 125 int xen_pcibk_config_header_add_fields(struct pci_dev *dev); 126 int xen_pcibk_config_capability_add_fields(struct pci_dev *dev); 127 128 #endif /* __XEN_PCIBACK_CONF_SPACE_H__ */ 129