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 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 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 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 55 static void __exit exit_hv_pci_intf(void) 56 { 57 } 58 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