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8014bcc86e
The variable for the 'permissive' module parameter used to be static
but was recently changed to be extern. This puts it in the kernel
global namespace if the driver is built-in, so its name should begin
with a prefix identifying the driver.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Fixes: af6fc858a3 ("xen-pciback: limit guest control of command register")
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/*
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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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