linux-stable/drivers/iommu/amd_iommu_debugfs.c
Gary R Hook 7d0f5fd3e4 iommu/amd: Add basic debugfs infrastructure for AMD IOMMU
Implement a skeleton framework for debugfs support in the AMD
IOMMU.  Add an AMD-specific Kconfig boolean that depends upon
general enablement of DebugFS in the IOMMU.

Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2018-07-06 14:06:30 +02:00

33 lines
805 B
C

// SPDX-License-Identifier: GPL-2.0
/*
* AMD IOMMU driver
*
* Copyright (C) 2018 Advanced Micro Devices, Inc.
*
* Author: Gary R Hook <gary.hook@amd.com>
*/
#include <linux/debugfs.h>
#include <linux/iommu.h>
#include <linux/pci.h>
#include "amd_iommu_proto.h"
#include "amd_iommu_types.h"
static struct dentry *amd_iommu_debugfs;
static DEFINE_MUTEX(amd_iommu_debugfs_lock);
#define MAX_NAME_LEN 20
void amd_iommu_debugfs_setup(struct amd_iommu *iommu)
{
char name[MAX_NAME_LEN + 1];
mutex_lock(&amd_iommu_debugfs_lock);
if (!amd_iommu_debugfs)
amd_iommu_debugfs = debugfs_create_dir("amd",
iommu_debugfs_dir);
mutex_unlock(&amd_iommu_debugfs_lock);
snprintf(name, MAX_NAME_LEN, "iommu%02d", iommu->index);
iommu->debugfs = debugfs_create_dir(name, amd_iommu_debugfs);
}