drivers/iommu/amd_iommu_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/iommu.h>
  12 #include <linux/pci.h>
  13 #include "amd_iommu_proto.h"
  14 #include "amd_iommu_types.h"
  15
  16 static struct dentry *amd_iommu_debugfs;
  17 static DEFINE_MUTEX(amd_iommu_debugfs_lock);
  18
  19 #define MAX_NAME_LEN    20
  20
  21 void amd_iommu_debugfs_setup(struct amd_iommu *iommu)
  22 {
  23         char name[MAX_NAME_LEN + 1];
  24
  25         mutex_lock(&amd_iommu_debugfs_lock);
  26         if (!amd_iommu_debugfs)
  27                 amd_iommu_debugfs = debugfs_create_dir("amd",
  28                                                        iommu_debugfs_dir);
  29         mutex_unlock(&amd_iommu_debugfs_lock);
  30
  31         snprintf(name, MAX_NAME_LEN, "iommu%02d", iommu->index);
  32         iommu->debugfs = debugfs_create_dir(name, amd_iommu_debugfs);
  33 }