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() */ 14typedef void *(*conf_field_init) (struct pci_dev *dev, int offset); 15typedef void (*conf_field_reset) (struct pci_dev *dev, int offset, void *data); 16typedef void (*conf_field_free) (struct pci_dev *dev, int offset, void *data); 17 18typedef int (*conf_dword_write) (struct pci_dev *dev, int offset, u32 value, 19 void *data); 20typedef int (*conf_word_write) (struct pci_dev *dev, int offset, u16 value, 21 void *data); 22typedef int (*conf_byte_write) (struct pci_dev *dev, int offset, u8 value, 23 void *data); 24typedef int (*conf_dword_read) (struct pci_dev *dev, int offset, u32 *value, 25 void *data); 26typedef int (*conf_word_read) (struct pci_dev *dev, int offset, u16 *value, 27 void *data); 28typedef 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 */ 35struct 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 60struct config_field_entry { 61 struct list_head list; 62 const struct config_field *field; 63 unsigned int base_offset; 64 void *data; 65}; 66 67extern 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 */ 74int xen_pcibk_config_add_field_offset(struct pci_dev *dev, 75 const struct config_field *field, 76 unsigned int offset); 77 78static 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 84static 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 96static 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 */ 110int xen_pcibk_read_config_byte(struct pci_dev *dev, int offset, u8 *value, 111 void *data); 112int xen_pcibk_read_config_word(struct pci_dev *dev, int offset, u16 *value, 113 void *data); 114int xen_pcibk_read_config_dword(struct pci_dev *dev, int offset, u32 *value, 115 void *data); 116int xen_pcibk_write_config_byte(struct pci_dev *dev, int offset, u8 value, 117 void *data); 118int xen_pcibk_write_config_word(struct pci_dev *dev, int offset, u16 value, 119 void *data); 120int xen_pcibk_write_config_dword(struct pci_dev *dev, int offset, u32 value, 121 void *data); 122 123int xen_pcibk_config_capability_init(void); 124 125int xen_pcibk_config_header_add_fields(struct pci_dev *dev); 126int xen_pcibk_config_capability_add_fields(struct pci_dev *dev); 127 128#endif /* __XEN_PCIBACK_CONF_SPACE_H__ */ 129