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136 lines
4.0 KiB
136 lines
4.0 KiB
/* 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 <[email protected]> |
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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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#define INTERRUPT_TYPE_NONE (0) |
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#define INTERRUPT_TYPE_INTX (1<<0) |
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#define INTERRUPT_TYPE_MSI (1<<1) |
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#define INTERRUPT_TYPE_MSIX (1<<2) |
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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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int xen_pcibk_get_interrupt_type(struct pci_dev *dev); |
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#endif /* __XEN_PCIBACK_CONF_SPACE_H__ */
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