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