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>
This commit is contained in:
parent
bad614b242
commit
7d0f5fd3e4
|
@ -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
|
||||
|
|
|
@ -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
33
drivers/iommu/amd_iommu_debugfs.c
Normal file
|
@ -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);
|
||||
}
|
|
@ -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;
|
||||
}
|
||||
|
||||
|
|
|
@ -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);
|
||||
|
|
|
@ -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)
|
||||
|
|
Loading…
Reference in a new issue