pci-hyperv-intf.c

 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#include <linux/export.h>
18
19struct hyperv_pci_block_ops hvpci_block_ops;
20EXPORT_SYMBOL_GPL(hvpci_block_ops);
21
22int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len,
23			unsigned int block_id, unsigned int *bytes_returned)
24{
25	if (!hvpci_block_ops.read_block)
26		return -EOPNOTSUPP;
27
28	return hvpci_block_ops.read_block(dev, buf, buf_len, block_id,
29					  bytes_returned);
30}
31EXPORT_SYMBOL_GPL(hyperv_read_cfg_blk);
32
33int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
34			 unsigned int block_id)
35{
36	if (!hvpci_block_ops.write_block)
37		return -EOPNOTSUPP;
38
39	return hvpci_block_ops.write_block(dev, buf, len, block_id);
40}
41EXPORT_SYMBOL_GPL(hyperv_write_cfg_blk);
42
43int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
44				void (*block_invalidate)(void *context,
45							 u64 block_mask))
46{
47	if (!hvpci_block_ops.reg_blk_invalidate)
48		return -EOPNOTSUPP;
49
50	return hvpci_block_ops.reg_blk_invalidate(dev, context,
51						  block_invalidate);
52}
53EXPORT_SYMBOL_GPL(hyperv_reg_block_invalidate);
54
55static void __exit exit_hv_pci_intf(void)
56{
57}
58
59static int __init init_hv_pci_intf(void)
60{
61	return 0;
62}
63
64module_init(init_hv_pci_intf);
65module_exit(exit_hv_pci_intf);
66
67MODULE_DESCRIPTION("Hyper-V PCI Interface");
68MODULE_LICENSE("GPL v2");