/* SPDX-License-Identifier: MIT */
/*
 * PCI Backend/Frontend Common Data Structures & Macros
 *
 *   Author: Ryan Wilson <hap9@epoch.ncsc.mil>
 */
#ifndef __XEN_PCI_COMMON_H__
#define __XEN_PCI_COMMON_H__

/* Be sure to bump this number if you change this file */
#define XEN_PCI_MAGIC "7"

/* xen_pci_sharedinfo flags */
#define	_XEN_PCIF_active		(0)
#define	XEN_PCIF_active			(1<<_XEN_PCIF_active)
#define	_XEN_PCIB_AERHANDLER		(1)
#define	XEN_PCIB_AERHANDLER		(1<<_XEN_PCIB_AERHANDLER)
#define	_XEN_PCIB_active		(2)
#define	XEN_PCIB_active			(1<<_XEN_PCIB_active)

/* xen_pci_op commands */
#define	XEN_PCI_OP_conf_read		(0)
#define	XEN_PCI_OP_conf_write		(1)
#define	XEN_PCI_OP_enable_msi		(2)
#define	XEN_PCI_OP_disable_msi		(3)
#define	XEN_PCI_OP_enable_msix		(4)
#define	XEN_PCI_OP_disable_msix		(5)
#define	XEN_PCI_OP_aer_detected		(6)
#define	XEN_PCI_OP_aer_resume		(7)
#define	XEN_PCI_OP_aer_mmio		(8)
#define	XEN_PCI_OP_aer_slotreset	(9)

/* xen_pci_op error numbers */
#define	XEN_PCI_ERR_success		(0)
#define	XEN_PCI_ERR_dev_not_found	(-1)
#define	XEN_PCI_ERR_invalid_offset	(-2)
#define	XEN_PCI_ERR_access_denied	(-3)
#define	XEN_PCI_ERR_not_implemented	(-4)
/* XEN_PCI_ERR_op_failed - backend failed to complete the operation */
#define XEN_PCI_ERR_op_failed		(-5)

/*
 * it should be PAGE_SIZE-sizeof(struct xen_pci_op))/sizeof(struct msix_entry))
 * Should not exceed 128
 */
#define SH_INFO_MAX_VEC			128

struct xen_msix_entry {
	uint16_t vector;
	uint16_t entry;
};
struct xen_pci_op {
	/* IN: what action to perform: XEN_PCI_OP_* */
	uint32_t cmd;

	/* OUT: will contain an error number (if any) from errno.h */
	int32_t err;

	/* IN: which device to touch */
	uint32_t domain; /* PCI Domain/Segment */
	uint32_t bus;
	uint32_t devfn;

	/* IN: which configuration registers to touch */
	int32_t offset;
	int32_t size;

	/* IN/OUT: Contains the result after a READ or the value to WRITE */
	uint32_t value;
	/* IN: Contains extra infor for this operation */
	uint32_t info;
	/*IN:  param for msi-x */
	struct xen_msix_entry msix_entries[SH_INFO_MAX_VEC];
};

/*used for pcie aer handling*/
struct xen_pcie_aer_op {
	/* IN: what action to perform: XEN_PCI_OP_* */
	uint32_t cmd;
	/*IN/OUT: return aer_op result or carry error_detected state as input*/
	int32_t err;

	/* IN: which device to touch */
	uint32_t domain; /* PCI Domain/Segment*/
	uint32_t bus;
	uint32_t devfn;
};
struct xen_pci_sharedinfo {
	/* flags - XEN_PCIF_* */
	uint32_t flags;
	struct xen_pci_op op;
	struct xen_pcie_aer_op aer_op;
};

#endif /* __XEN_PCI_COMMON_H__ */