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
19 struct hyperv_pci_block_ops hvpci_block_ops;
20 EXPORT_SYMBOL_GPL(hvpci_block_ops);
21
hyperv_read_cfg_blk(struct pci_dev * dev,void * buf,unsigned int buf_len,unsigned int block_id,unsigned int * bytes_returned)22 int 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 }
31 EXPORT_SYMBOL_GPL(hyperv_read_cfg_blk);
32
hyperv_write_cfg_blk(struct pci_dev * dev,void * buf,unsigned int len,unsigned int block_id)33 int 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 }
41 EXPORT_SYMBOL_GPL(hyperv_write_cfg_blk);
42
hyperv_reg_block_invalidate(struct pci_dev * dev,void * context,void (* block_invalidate)(void * context,u64 block_mask))43 int 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 }
53 EXPORT_SYMBOL_GPL(hyperv_reg_block_invalidate);
54
exit_hv_pci_intf(void)55 static void __exit exit_hv_pci_intf(void)
56 {
57 }
58
init_hv_pci_intf(void)59 static int __init init_hv_pci_intf(void)
60 {
61 return 0;
62 }
63
64 module_init(init_hv_pci_intf);
65 module_exit(exit_hv_pci_intf);
66
67 MODULE_DESCRIPTION("Hyper-V PCI Interface");
68 MODULE_LICENSE("GPL v2");
69