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iommu/amd: Add basic debugfs infrastructure for AMD IOMMU

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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>
This commit is contained in:
Gary R Hook 2018-06-12 16:41:30 -05:00 committed by Joerg Roedel
parent bad614b242
commit 7d0f5fd3e4
6 changed files with 61 additions and 2 deletions
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12
drivers/iommu/Kconfig
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@ -145,6 +145,18 @@ config AMD_IOMMU_V2
hardware. Select this option if you want to use devices that support
the PCI PRI and PASID interface.
config AMD_IOMMU_DEBUGFS
bool "Enable AMD IOMMU internals in DebugFS"
depends on AMD_IOMMU && IOMMU_DEBUGFS
---help---
!!!WARNING!!! !!!WARNING!!! !!!WARNING!!! !!!WARNING!!!
DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!!
Exposes AMD IOMMU device internals in DebugFS.
This option is -NOT- intended for production environments, and should
not generally be enabled.
# Intel IOMMU support
config DMAR_TABLE
bool

1
drivers/iommu/Makefile
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@ -11,6 +11,7 @@ obj-$(CONFIG_IOMMU_IOVA) += iova.o
obj-$(CONFIG_OF_IOMMU) += of_iommu.o
obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o
obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o
obj-$(CONFIG_AMD_IOMMU_DEBUGFS) += amd_iommu_debugfs.o
obj-$(CONFIG_AMD_IOMMU_V2) += amd_iommu_v2.o
obj-$(CONFIG_ARM_SMMU) += arm-smmu.o
obj-$(CONFIG_ARM_SMMU_V3) += arm-smmu-v3.o

33
drivers/iommu/amd_iommu_debugfs.c Normal file
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@ -0,0 +1,33 @@
// 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);
}

6
drivers/iommu/amd_iommu_init.c
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@ -2721,6 +2721,7 @@ int __init amd_iommu_enable_faulting(void)
*/
static int __init amd_iommu_init(void)
{
struct amd_iommu *iommu;
int ret;
ret = iommu_go_to_state(IOMMU_INITIALIZED);
@ -2730,14 +2731,15 @@ static int __init amd_iommu_init(void)
disable_iommus();
free_iommu_resources();
} else {
struct amd_iommu *iommu;
uninit_device_table_dma();
for_each_iommu(iommu)
iommu_flush_all_caches(iommu);
}
}
for_each_iommu(iommu)
amd_iommu_debugfs_setup(iommu);
return ret;
}

6
drivers/iommu/amd_iommu_proto.h
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@ -33,6 +33,12 @@ extern void amd_iommu_uninit_devices(void);
extern void amd_iommu_init_notifier(void);
extern int amd_iommu_init_api(void);
#ifdef CONFIG_AMD_IOMMU_DEBUGFS
void amd_iommu_debugfs_setup(struct amd_iommu *iommu);
#else
static inline void amd_iommu_debugfs_setup(struct amd_iommu *iommu) {}
#endif
/* Needed for interrupt remapping */
extern int amd_iommu_prepare(void);
extern int amd_iommu_enable(void);

5
drivers/iommu/amd_iommu_types.h
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@ -594,6 +594,11 @@ struct amd_iommu {
u32 flags;
volatile u64 __aligned(8) cmd_sem;
#ifdef CONFIG_AMD_IOMMU_DEBUGFS
/* DebugFS Info */
struct dentry *debugfs;
#endif
};
static inline struct amd_iommu *dev_to_amd_iommu(struct device *dev)