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1// SPDX-License-Identifier: GPL-2.02/*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 to9 * have a common interface with the Hyper-V PCI frontend driver.10 */11 12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt13 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