1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * AMD IOMMU driver 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (C) 2018 Advanced Micro Devices, Inc. 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * Author: Gary R Hook <gary.hook@amd.com> 8*4882a593Smuzhiyun */ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #include <linux/debugfs.h> 11*4882a593Smuzhiyun #include <linux/pci.h> 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun #include "amd_iommu.h" 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun static struct dentry *amd_iommu_debugfs; 16*4882a593Smuzhiyun static DEFINE_MUTEX(amd_iommu_debugfs_lock); 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun #define MAX_NAME_LEN 20 19*4882a593Smuzhiyun amd_iommu_debugfs_setup(struct amd_iommu * iommu)20*4882a593Smuzhiyunvoid amd_iommu_debugfs_setup(struct amd_iommu *iommu) 21*4882a593Smuzhiyun { 22*4882a593Smuzhiyun char name[MAX_NAME_LEN + 1]; 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun mutex_lock(&amd_iommu_debugfs_lock); 25*4882a593Smuzhiyun if (!amd_iommu_debugfs) 26*4882a593Smuzhiyun amd_iommu_debugfs = debugfs_create_dir("amd", 27*4882a593Smuzhiyun iommu_debugfs_dir); 28*4882a593Smuzhiyun mutex_unlock(&amd_iommu_debugfs_lock); 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun snprintf(name, MAX_NAME_LEN, "iommu%02d", iommu->index); 31*4882a593Smuzhiyun iommu->debugfs = debugfs_create_dir(name, amd_iommu_debugfs); 32*4882a593Smuzhiyun } 33