1353358Sdim// SPDX-License-Identifier: GPL-2.0
2353358Sdim/*
3353358Sdim * Copyright (c) Microsoft Corporation.
4353358Sdim *
5353358Sdim * Author:
6353358Sdim *   Haiyang Zhang <haiyangz@microsoft.com>
7353358Sdim *
8353358Sdim * This small module is a helper driver allows other drivers to
9353358Sdim * have a common interface with the Hyper-V PCI frontend driver.
10353358Sdim */
11353358Sdim
12276789Sdim#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13276789Sdim
14276789Sdim#include <linux/kernel.h>
15353358Sdim#include <linux/module.h>
16276789Sdim#include <linux/hyperv.h>
17353358Sdim
18353358Sdimstruct hyperv_pci_block_ops hvpci_block_ops;
19353358SdimEXPORT_SYMBOL_GPL(hvpci_block_ops);
20353358Sdim
21353358Sdimint hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len,
22353358Sdim			unsigned int block_id, unsigned int *bytes_returned)
23353358Sdim{
24353358Sdim	if (!hvpci_block_ops.read_block)
25353358Sdim		return -EOPNOTSUPP;
26353358Sdim
27353358Sdim	return hvpci_block_ops.read_block(dev, buf, buf_len, block_id,
28353358Sdim					  bytes_returned);
29353358Sdim}
30353358SdimEXPORT_SYMBOL_GPL(hyperv_read_cfg_blk);
31353358Sdim
32353358Sdimint hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
33353358Sdim			 unsigned int block_id)
34276789Sdim{
35276789Sdim	if (!hvpci_block_ops.write_block)
36353358Sdim		return -EOPNOTSUPP;
37276789Sdim
38353358Sdim	return hvpci_block_ops.write_block(dev, buf, len, block_id);
39353358Sdim}
40353358SdimEXPORT_SYMBOL_GPL(hyperv_write_cfg_blk);
41353358Sdim
42353358Sdimint hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
43353358Sdim				void (*block_invalidate)(void *context,
44353358Sdim							 u64 block_mask))
45353358Sdim{
46353358Sdim	if (!hvpci_block_ops.reg_blk_invalidate)
47276789Sdim		return -EOPNOTSUPP;
48321369Sdim
49321369Sdim	return hvpci_block_ops.reg_blk_invalidate(dev, context,
50353358Sdim						  block_invalidate);
51321369Sdim}
52EXPORT_SYMBOL_GPL(hyperv_reg_block_invalidate);
53
54static void __exit exit_hv_pci_intf(void)
55{
56}
57
58static int __init init_hv_pci_intf(void)
59{
60	return 0;
61}
62
63module_init(init_hv_pci_intf);
64module_exit(exit_hv_pci_intf);
65
66MODULE_DESCRIPTION("Hyper-V PCI Interface");
67MODULE_LICENSE("GPL v2");
68