cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pci-hyperv-intf.c (1649B)

      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
     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");