Gary R Hook | bad614b | 2018-06-12 16:41:21 -0500 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * IOMMU debugfs core infrastructure |
| 4 | * |
| 5 | * Copyright (C) 2018 Advanced Micro Devices, Inc. |
| 6 | * |
| 7 | * Author: Gary R Hook <gary.hook@amd.com> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/pci.h> |
| 11 | #include <linux/iommu.h> |
| 12 | #include <linux/debugfs.h> |
| 13 | |
| 14 | struct dentry *iommu_debugfs_dir; |
Geert Uytterhoeven | 18b3af4 | 2019-02-20 14:05:05 +0100 | [diff] [blame] | 15 | EXPORT_SYMBOL_GPL(iommu_debugfs_dir); |
Gary R Hook | bad614b | 2018-06-12 16:41:21 -0500 | [diff] [blame] | 16 | |
| 17 | /** |
| 18 | * iommu_debugfs_setup - create the top-level iommu directory in debugfs |
| 19 | * |
| 20 | * Provide base enablement for using debugfs to expose internal data of an |
| 21 | * IOMMU driver. When called, this function creates the |
| 22 | * /sys/kernel/debug/iommu directory. |
| 23 | * |
| 24 | * Emit a strong warning at boot time to indicate that this feature is |
| 25 | * enabled. |
| 26 | * |
Geert Uytterhoeven | 18b3af4 | 2019-02-20 14:05:05 +0100 | [diff] [blame] | 27 | * This function is called from iommu_init; drivers may then use |
| 28 | * iommu_debugfs_dir to instantiate a vendor-specific directory to be used |
| 29 | * to expose internal data. |
Gary R Hook | bad614b | 2018-06-12 16:41:21 -0500 | [diff] [blame] | 30 | */ |
| 31 | void iommu_debugfs_setup(void) |
| 32 | { |
| 33 | if (!iommu_debugfs_dir) { |
| 34 | iommu_debugfs_dir = debugfs_create_dir("iommu", NULL); |
| 35 | pr_warn("\n"); |
| 36 | pr_warn("*************************************************************\n"); |
| 37 | pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); |
| 38 | pr_warn("** **\n"); |
| 39 | pr_warn("** IOMMU DebugFS SUPPORT HAS BEEN ENABLED IN THIS KERNEL **\n"); |
| 40 | pr_warn("** **\n"); |
| 41 | pr_warn("** This means that this kernel is built to expose internal **\n"); |
| 42 | pr_warn("** IOMMU data structures, which may compromise security on **\n"); |
| 43 | pr_warn("** your system. **\n"); |
| 44 | pr_warn("** **\n"); |
| 45 | pr_warn("** If you see this message and you are not debugging the **\n"); |
| 46 | pr_warn("** kernel, report this immediately to your vendor! **\n"); |
| 47 | pr_warn("** **\n"); |
| 48 | pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); |
| 49 | pr_warn("*************************************************************\n"); |
| 50 | } |
| 51 | } |