text: /* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
  /*
   * Copyright (C) 2021 Intel Corporation
   * Author: Johannes Berg <johannes@sipsolutions.net>
   */
  #ifndef _UAPI_LINUX_VIRTIO_PCIDEV_H
  #define _UAPI_LINUX_VIRTIO_PCIDEV_H
  #include <linux/types.h>
  
  /**
   * enum virtio_pcidev_ops - virtual PCI device operations
   * @VIRTIO_PCIDEV_OP_RESERVED: reserved to catch errors
   * @VIRTIO_PCIDEV_OP_CFG_READ: read config space, size is 1, 2, 4 or 8;
   *	the @data field should be filled in by the device (in little endian).
   * @VIRTIO_PCIDEV_OP_CFG_WRITE: write config space, size is 1, 2, 4 or 8;
   *	the @data field contains the data to write (in little endian).
   * @VIRTIO_PCIDEV_OP_MMIO_READ: read BAR mem/pio, size can be variable;
   *	the @data field should be filled in by the device (in little endian).
   * @VIRTIO_PCIDEV_OP_MMIO_WRITE: write BAR mem/pio, size can be variable;
   *	the @data field contains the data to write (in little endian).
   * @VIRTIO_PCIDEV_OP_MMIO_MEMSET: memset MMIO, size is variable but
   *	the @data field only has one byte (unlike @VIRTIO_PCIDEV_OP_MMIO_WRITE)
   * @VIRTIO_PCIDEV_OP_INT: legacy INTx# pin interrupt, the addr field is 1-4 for
   *	the number
   * @VIRTIO_PCIDEV_OP_MSI: MSI(-X) interrupt, this message basically transports
   *	the 16- or 32-bit write that would otherwise be done into memory,
   *	analogous to the write messages (@VIRTIO_PCIDEV_OP_MMIO_WRITE) above
   * @VIRTIO_PCIDEV_OP_PME: Dummy message whose content is ignored (and should be
   *	all zeroes) to signal the PME# pin.
   */
  enum virtio_pcidev_ops {
  	VIRTIO_PCIDEV_OP_RESERVED = 0,
  	VIRTIO_PCIDEV_OP_CFG_READ,
  	VIRTIO_PCIDEV_OP_CFG_WRITE,
  	VIRTIO_PCIDEV_OP_MMIO_READ,
  	VIRTIO_PCIDEV_OP_MMIO_WRITE,
  	VIRTIO_PCIDEV_OP_MMIO_MEMSET,
  	VIRTIO_PCIDEV_OP_INT,
  	VIRTIO_PCIDEV_OP_MSI,
  	VIRTIO_PCIDEV_OP_PME,
  };
  
  /**
   * struct virtio_pcidev_msg - virtio PCI device operation
   * @op: the operation to do
   * @bar: the bar (only with BAR read/write messages)
   * @reserved: reserved
   * @size: the size of the read/write (in bytes)
   * @addr: the address to read/write
   * @data: the data, normally @size long, but just one byte for
   *	%VIRTIO_PCIDEV_OP_MMIO_MEMSET
   *
   * Note: the fields are all in native (CPU) endian, however, the
   * @data values will often be in little endian (see the ops above.)
   */
  struct virtio_pcidev_msg {
  	__u8 op;
  	__u8 bar;
  	__u16 reserved;
  	__u32 size;
  	__u64 addr;
  	__u8 data[];
  };
  
  #endif /* _UAPI_LINUX_VIRTIO_PCIDEV_H */
  