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51 lines
2.0 KiB
51 lines
2.0 KiB
// 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 <[email protected]> |
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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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