1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) Microsoft Corporation.
4 *
5 * Author:
6 *   Haiyang Zhang <haiyangz@microsoft.com>
7 *
8 * This small module is a helper driver allows other drivers to
9 * have a common interface with the Hyper-V PCI frontend driver.
10 */
11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/hyperv.h>
17
18struct hyperv_pci_block_ops hvpci_block_ops;
19EXPORT_SYMBOL_GPL(hvpci_block_ops);
20
21int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len,
22			unsigned int block_id, unsigned int *bytes_returned)
23{
24	if (!hvpci_block_ops.read_block)
25		return -EOPNOTSUPP;
26
27	return hvpci_block_ops.read_block(dev, buf, buf_len, block_id,
28					  bytes_returned);
29}
30EXPORT_SYMBOL_GPL(hyperv_read_cfg_blk);
31
32int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
33			 unsigned int block_id)
34{
35	if (!hvpci_block_ops.write_block)
36		return -EOPNOTSUPP;
37
38	return hvpci_block_ops.write_block(dev, buf, len, block_id);
39}
40EXPORT_SYMBOL_GPL(hyperv_write_cfg_blk);
41
42int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
43				void (*block_invalidate)(void *context,
44							 u64 block_mask))
45{
46	if (!hvpci_block_ops.reg_blk_invalidate)
47		return -EOPNOTSUPP;
48
49	return hvpci_block_ops.reg_blk_invalidate(dev, context,
50						  block_invalidate);
51}
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