/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* PCI Backend - Common data structures for overriding the configuration space
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*
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* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
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*/
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#ifndef __XEN_PCIBACK_CONF_SPACE_H__
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#define __XEN_PCIBACK_CONF_SPACE_H__
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#include <linux/list.h>
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#include <linux/err.h>
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/* conf_field_init can return an errno in a ptr with ERR_PTR() */
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typedef void *(*conf_field_init) (struct pci_dev *dev, int offset);
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typedef void (*conf_field_reset) (struct pci_dev *dev, int offset, void *data);
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typedef void (*conf_field_free) (struct pci_dev *dev, int offset, void *data);
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typedef int (*conf_dword_write) (struct pci_dev *dev, int offset, u32 value,
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void *data);
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typedef int (*conf_word_write) (struct pci_dev *dev, int offset, u16 value,
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void *data);
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typedef int (*conf_byte_write) (struct pci_dev *dev, int offset, u8 value,
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void *data);
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typedef int (*conf_dword_read) (struct pci_dev *dev, int offset, u32 *value,
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void *data);
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typedef int (*conf_word_read) (struct pci_dev *dev, int offset, u16 *value,
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void *data);
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typedef int (*conf_byte_read) (struct pci_dev *dev, int offset, u8 *value,
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void *data);
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/* These are the fields within the configuration space which we
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* are interested in intercepting reads/writes to and changing their
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* values.
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*/
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struct config_field {
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unsigned int offset;
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unsigned int size;
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unsigned int mask;
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conf_field_init init;
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conf_field_reset reset;
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conf_field_free release;
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void (*clean) (struct config_field *field);
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union {
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struct {
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conf_dword_write write;
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conf_dword_read read;
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} dw;
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struct {
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conf_word_write write;
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conf_word_read read;
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} w;
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struct {
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conf_byte_write write;
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conf_byte_read read;
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} b;
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} u;
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struct list_head list;
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};
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struct config_field_entry {
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struct list_head list;
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const struct config_field *field;
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unsigned int base_offset;
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void *data;
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};
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extern bool xen_pcibk_permissive;
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#define OFFSET(cfg_entry) ((cfg_entry)->base_offset+(cfg_entry)->field->offset)
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/* Add fields to a device - the add_fields macro expects to get a pointer to
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* the first entry in an array (of which the ending is marked by size==0)
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*/
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int xen_pcibk_config_add_field_offset(struct pci_dev *dev,
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const struct config_field *field,
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unsigned int offset);
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static inline int xen_pcibk_config_add_field(struct pci_dev *dev,
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const struct config_field *field)
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{
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return xen_pcibk_config_add_field_offset(dev, field, 0);
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}
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static inline int xen_pcibk_config_add_fields(struct pci_dev *dev,
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const struct config_field *field)
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{
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int i, err = 0;
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for (i = 0; field[i].size != 0; i++) {
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err = xen_pcibk_config_add_field(dev, &field[i]);
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if (err)
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break;
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}
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return err;
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}
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static inline int xen_pcibk_config_add_fields_offset(struct pci_dev *dev,
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const struct config_field *field,
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unsigned int offset)
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{
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int i, err = 0;
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for (i = 0; field[i].size != 0; i++) {
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err = xen_pcibk_config_add_field_offset(dev, &field[i], offset);
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if (err)
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break;
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}
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return err;
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}
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/* Read/Write the real configuration space */
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int xen_pcibk_read_config_byte(struct pci_dev *dev, int offset, u8 *value,
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void *data);
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int xen_pcibk_read_config_word(struct pci_dev *dev, int offset, u16 *value,
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void *data);
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int xen_pcibk_read_config_dword(struct pci_dev *dev, int offset, u32 *value,
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void *data);
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int xen_pcibk_write_config_byte(struct pci_dev *dev, int offset, u8 value,
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void *data);
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int xen_pcibk_write_config_word(struct pci_dev *dev, int offset, u16 value,
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void *data);
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int xen_pcibk_write_config_dword(struct pci_dev *dev, int offset, u32 value,
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void *data);
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int xen_pcibk_config_capability_init(void);
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int xen_pcibk_config_header_add_fields(struct pci_dev *dev);
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int xen_pcibk_config_capability_add_fields(struct pci_dev *dev);
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#endif /* __XEN_PCIBACK_CONF_SPACE_H__ */
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