https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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- v2.6.20-rc4
- v2.6.20-rc3
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Tip revision: 2585cf9dfaaddf00b069673f27bb3f8530e2039c authored by Linus Torvalds on 12 December 2021, 22:53:01 UTC
Linux 5.16-rc5
Linux 5.16-rc5
Tip revision: 2585cf9
iommu-debugfs.c
// SPDX-License-Identifier: GPL-2.0
/*
* IOMMU debugfs core infrastructure
*
* Copyright (C) 2018 Advanced Micro Devices, Inc.
*
* Author: Gary R Hook <gary.hook@amd.com>
*/
#include <linux/pci.h>
#include <linux/iommu.h>
#include <linux/debugfs.h>
struct dentry *iommu_debugfs_dir;
EXPORT_SYMBOL_GPL(iommu_debugfs_dir);
/**
* iommu_debugfs_setup - create the top-level iommu directory in debugfs
*
* Provide base enablement for using debugfs to expose internal data of an
* IOMMU driver. When called, this function creates the
* /sys/kernel/debug/iommu directory.
*
* Emit a strong warning at boot time to indicate that this feature is
* enabled.
*
* This function is called from iommu_init; drivers may then use
* iommu_debugfs_dir to instantiate a vendor-specific directory to be used
* to expose internal data.
*/
void iommu_debugfs_setup(void)
{
if (!iommu_debugfs_dir) {
iommu_debugfs_dir = debugfs_create_dir("iommu", NULL);
pr_warn("\n");
pr_warn("*************************************************************\n");
pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
pr_warn("** **\n");
pr_warn("** IOMMU DebugFS SUPPORT HAS BEEN ENABLED IN THIS KERNEL **\n");
pr_warn("** **\n");
pr_warn("** This means that this kernel is built to expose internal **\n");
pr_warn("** IOMMU data structures, which may compromise security on **\n");
pr_warn("** your system. **\n");
pr_warn("** **\n");
pr_warn("** If you see this message and you are not debugging the **\n");
pr_warn("** kernel, report this immediately to your vendor! **\n");
pr_warn("** **\n");
pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
pr_warn("*************************************************************\n");
}
}