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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * PCI Backend - Common data structures for overriding the configuration space4 *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() */15typedef void *(*conf_field_init) (struct pci_dev *dev, int offset);16typedef void (*conf_field_reset) (struct pci_dev *dev, int offset, void *data);17typedef void (*conf_field_free) (struct pci_dev *dev, int offset, void *data);18 19typedef int (*conf_dword_write) (struct pci_dev *dev, int offset, u32 value,20 void *data);21typedef int (*conf_word_write) (struct pci_dev *dev, int offset, u16 value,22 void *data);23typedef int (*conf_byte_write) (struct pci_dev *dev, int offset, u8 value,24 void *data);25typedef int (*conf_dword_read) (struct pci_dev *dev, int offset, u32 *value,26 void *data);27typedef int (*conf_word_read) (struct pci_dev *dev, int offset, u16 *value,28 void *data);29typedef 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 we33 * are interested in intercepting reads/writes to and changing their34 * values.35 */36struct 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 61struct config_field_entry {62 struct list_head list;63 const struct config_field *field;64 unsigned int base_offset;65 void *data;66};67 68#define INTERRUPT_TYPE_NONE (0)69#define INTERRUPT_TYPE_INTX (1<<0)70#define INTERRUPT_TYPE_MSI (1<<1)71#define INTERRUPT_TYPE_MSIX (1<<2)72 73extern bool xen_pcibk_permissive;74 75#define OFFSET(cfg_entry) ((cfg_entry)->base_offset+(cfg_entry)->field->offset)76 77/* Add fields to a device - the add_fields macro expects to get a pointer to78 * the first entry in an array (of which the ending is marked by size==0)79 */80int xen_pcibk_config_add_field_offset(struct pci_dev *dev,81 const struct config_field *field,82 unsigned int offset);83 84static inline int xen_pcibk_config_add_field(struct pci_dev *dev,85 const struct config_field *field)86{87 return xen_pcibk_config_add_field_offset(dev, field, 0);88}89 90static inline int xen_pcibk_config_add_fields(struct pci_dev *dev,91 const struct config_field *field)92{93 int i, err = 0;94 for (i = 0; field[i].size != 0; i++) {95 err = xen_pcibk_config_add_field(dev, &field[i]);96 if (err)97 break;98 }99 return err;100}101 102static inline int xen_pcibk_config_add_fields_offset(struct pci_dev *dev,103 const struct config_field *field,104 unsigned int offset)105{106 int i, err = 0;107 for (i = 0; field[i].size != 0; i++) {108 err = xen_pcibk_config_add_field_offset(dev, &field[i], offset);109 if (err)110 break;111 }112 return err;113}114 115/* Read/Write the real configuration space */116int xen_pcibk_read_config_byte(struct pci_dev *dev, int offset, u8 *value,117 void *data);118int xen_pcibk_read_config_word(struct pci_dev *dev, int offset, u16 *value,119 void *data);120int xen_pcibk_read_config_dword(struct pci_dev *dev, int offset, u32 *value,121 void *data);122int xen_pcibk_write_config_byte(struct pci_dev *dev, int offset, u8 value,123 void *data);124int xen_pcibk_write_config_word(struct pci_dev *dev, int offset, u16 value,125 void *data);126int xen_pcibk_write_config_dword(struct pci_dev *dev, int offset, u32 value,127 void *data);128 129int xen_pcibk_config_capability_init(void);130 131int xen_pcibk_config_header_add_fields(struct pci_dev *dev);132int xen_pcibk_config_capability_add_fields(struct pci_dev *dev);133 134int xen_pcibk_get_interrupt_type(struct pci_dev *dev);135 136#endif /* __XEN_PCIBACK_CONF_SPACE_H__ */137