conf_space.h 4.0 KB

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