1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) Microsoft Corporation.
6 * Haiyang Zhang <haiyangz@microsoft.com>
8 * This small module is a helper driver allows other drivers to
9 * have a common interface with the Hyper-V PCI frontend driver.
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/hyperv.h>
18 struct hyperv_pci_block_ops hvpci_block_ops
;
19 EXPORT_SYMBOL_GPL(hvpci_block_ops
);
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
)
24 if (!hvpci_block_ops
.read_block
)
27 return hvpci_block_ops
.read_block(dev
, buf
, buf_len
, block_id
,
30 EXPORT_SYMBOL_GPL(hyperv_read_cfg_blk
);
32 int hyperv_write_cfg_blk(struct pci_dev
*dev
, void *buf
, unsigned int len
,
33 unsigned int block_id
)
35 if (!hvpci_block_ops
.write_block
)
38 return hvpci_block_ops
.write_block(dev
, buf
, len
, block_id
);
40 EXPORT_SYMBOL_GPL(hyperv_write_cfg_blk
);
42 int hyperv_reg_block_invalidate(struct pci_dev
*dev
, void *context
,
43 void (*block_invalidate
)(void *context
,
46 if (!hvpci_block_ops
.reg_blk_invalidate
)
49 return hvpci_block_ops
.reg_blk_invalidate(dev
, context
,
52 EXPORT_SYMBOL_GPL(hyperv_reg_block_invalidate
);
54 static void __exit
exit_hv_pci_intf(void)
58 static int __init
init_hv_pci_intf(void)
63 module_init(init_hv_pci_intf
);
64 module_exit(exit_hv_pci_intf
);
66 MODULE_DESCRIPTION("Hyper-V PCI Interface");
67 MODULE_LICENSE("GPL v2");