Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * IOMMU debugfs core infrastructure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2018 Advanced Micro Devices, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Author: Gary R Hook <gary.hook@amd.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/iommu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) struct dentry *iommu_debugfs_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) EXPORT_SYMBOL_GPL(iommu_debugfs_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  * iommu_debugfs_setup - create the top-level iommu directory in debugfs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * Provide base enablement for using debugfs to expose internal data of an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * IOMMU driver. When called, this function creates the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * /sys/kernel/debug/iommu directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  * Emit a strong warning at boot time to indicate that this feature is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)  * enabled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)  * This function is called from iommu_init; drivers may then use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)  * iommu_debugfs_dir to instantiate a vendor-specific directory to be used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  * to expose internal data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) void iommu_debugfs_setup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	if (!iommu_debugfs_dir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		iommu_debugfs_dir = debugfs_create_dir("iommu", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		pr_warn("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		pr_warn("*************************************************************\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		pr_warn("**     NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE    **\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		pr_warn("**                                                         **\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		pr_warn("**  IOMMU DebugFS SUPPORT HAS BEEN ENABLED IN THIS KERNEL  **\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		pr_warn("**                                                         **\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		pr_warn("** This means that this kernel is built to expose internal **\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		pr_warn("** IOMMU data structures, which may compromise security on **\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		pr_warn("** your system.                                            **\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		pr_warn("**                                                         **\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		pr_warn("** If you see this message and you are not debugging the   **\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		pr_warn("** kernel, report this immediately to your vendor!         **\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		pr_warn("**                                                         **\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		pr_warn("**     NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE    **\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		pr_warn("*************************************************************\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }