52 lines
2.0 KiB
C
52 lines
2.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* IOMMU debugfs core infrastructure
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*
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* Copyright (C) 2018 Advanced Micro Devices, Inc.
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*
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* Author: Gary R Hook <gary.hook@amd.com>
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*/
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#include <linux/pci.h>
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#include <linux/iommu.h>
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#include <linux/debugfs.h>
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struct dentry *iommu_debugfs_dir;
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EXPORT_SYMBOL_GPL(iommu_debugfs_dir);
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/**
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* iommu_debugfs_setup - create the top-level iommu directory in debugfs
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*
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* Provide base enablement for using debugfs to expose internal data of an
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* IOMMU driver. When called, this function creates the
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* /sys/kernel/debug/iommu directory.
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*
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* Emit a strong warning at boot time to indicate that this feature is
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* enabled.
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*
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* This function is called from iommu_init; drivers may then use
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* iommu_debugfs_dir to instantiate a vendor-specific directory to be used
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* to expose internal data.
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*/
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void iommu_debugfs_setup(void)
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{
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if (!iommu_debugfs_dir) {
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iommu_debugfs_dir = debugfs_create_dir("iommu", NULL);
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pr_warn("\n");
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pr_warn("*************************************************************\n");
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pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
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pr_warn("** **\n");
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pr_warn("** IOMMU DebugFS SUPPORT HAS BEEN ENABLED IN THIS KERNEL **\n");
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pr_warn("** **\n");
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pr_warn("** This means that this kernel is built to expose internal **\n");
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pr_warn("** IOMMU data structures, which may compromise security on **\n");
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pr_warn("** your system. **\n");
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pr_warn("** **\n");
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pr_warn("** If you see this message and you are not debugging the **\n");
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pr_warn("** kernel, report this immediately to your vendor! **\n");
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pr_warn("** **\n");
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pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
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pr_warn("*************************************************************\n");
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}
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}
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