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 | |
18 | struct hyperv_pci_block_ops hvpci_block_ops; |
19 | EXPORT_SYMBOL_GPL(hvpci_block_ops); |
20 | |
21 | int 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 | } |
30 | EXPORT_SYMBOL_GPL(hyperv_read_cfg_blk); |
31 | |
32 | int 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 | } |
40 | EXPORT_SYMBOL_GPL(hyperv_write_cfg_blk); |
41 | |
42 | int 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 | } |
52 | EXPORT_SYMBOL_GPL(hyperv_reg_block_invalidate); |
53 | |
54 | static void __exit exit_hv_pci_intf(void) |
55 | { |
56 | } |
57 | |
58 | static int __init init_hv_pci_intf(void) |
59 | { |
60 | return 0; |
61 | } |
62 | |
63 | module_init(init_hv_pci_intf); |
64 | module_exit(exit_hv_pci_intf); |
65 | |
66 | MODULE_DESCRIPTION("Hyper-V PCI Interface" ); |
67 | MODULE_LICENSE("GPL v2" ); |
68 | |