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