1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * AMD IOMMU driver 4 * 5 * Copyright (C) 2018 Advanced Micro Devices, Inc. 6 * 7 * Author: Gary R Hook <gary.hook@amd.com> 8 */ 9 10 #include <linux/debugfs.h> 11 #include <linux/pci.h> 12 13 #include "amd_iommu.h" 14 15 static struct dentry *amd_iommu_debugfs; 16 static DEFINE_MUTEX(amd_iommu_debugfs_lock); 17 18 #define MAX_NAME_LEN 20 19 20 void amd_iommu_debugfs_setup(struct amd_iommu *iommu) 21 { 22 char name[MAX_NAME_LEN + 1]; 23 24 mutex_lock(&amd_iommu_debugfs_lock); 25 if (!amd_iommu_debugfs) 26 amd_iommu_debugfs = debugfs_create_dir("amd", 27 iommu_debugfs_dir); 28 mutex_unlock(&amd_iommu_debugfs_lock); 29 30 snprintf(name, MAX_NAME_LEN, "iommu%02d", iommu->index); 31 iommu->debugfs = debugfs_create_dir(name, amd_iommu_debugfs); 32 } 33