52 lines
2 KiB
C
52 lines
2 KiB
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");
|
||
|
|
}
|
||
|
|
}
|