drivers/iommu/amd/debugfs.c

   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 }