1353358Sdim// SPDX-License-Identifier: GPL-2.0 2353358Sdim/* 3353358Sdim * Copyright (c) Microsoft Corporation. 4353358Sdim * 5353358Sdim * Author: 6353358Sdim * Haiyang Zhang <haiyangz@microsoft.com> 7353358Sdim * 8353358Sdim * This small module is a helper driver allows other drivers to 9353358Sdim * have a common interface with the Hyper-V PCI frontend driver. 10353358Sdim */ 11353358Sdim 12276789Sdim#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13276789Sdim 14276789Sdim#include <linux/kernel.h> 15353358Sdim#include <linux/module.h> 16276789Sdim#include <linux/hyperv.h> 17353358Sdim 18353358Sdimstruct hyperv_pci_block_ops hvpci_block_ops; 19353358SdimEXPORT_SYMBOL_GPL(hvpci_block_ops); 20353358Sdim 21353358Sdimint hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len, 22353358Sdim unsigned int block_id, unsigned int *bytes_returned) 23353358Sdim{ 24353358Sdim if (!hvpci_block_ops.read_block) 25353358Sdim return -EOPNOTSUPP; 26353358Sdim 27353358Sdim return hvpci_block_ops.read_block(dev, buf, buf_len, block_id, 28353358Sdim bytes_returned); 29353358Sdim} 30353358SdimEXPORT_SYMBOL_GPL(hyperv_read_cfg_blk); 31353358Sdim 32353358Sdimint hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len, 33353358Sdim unsigned int block_id) 34276789Sdim{ 35276789Sdim if (!hvpci_block_ops.write_block) 36353358Sdim return -EOPNOTSUPP; 37276789Sdim 38353358Sdim return hvpci_block_ops.write_block(dev, buf, len, block_id); 39353358Sdim} 40353358SdimEXPORT_SYMBOL_GPL(hyperv_write_cfg_blk); 41353358Sdim 42353358Sdimint hyperv_reg_block_invalidate(struct pci_dev *dev, void *context, 43353358Sdim void (*block_invalidate)(void *context, 44353358Sdim u64 block_mask)) 45353358Sdim{ 46353358Sdim if (!hvpci_block_ops.reg_blk_invalidate) 47276789Sdim return -EOPNOTSUPP; 48321369Sdim 49321369Sdim return hvpci_block_ops.reg_blk_invalidate(dev, context, 50353358Sdim block_invalidate); 51321369Sdim} 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