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>hifive-unleashed-5.1
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bad614b242
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7d0f5fd3e4
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@ -145,6 +145,18 @@ config AMD_IOMMU_V2
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hardware. Select this option if you want to use devices that support
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hardware. Select this option if you want to use devices that support
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the PCI PRI and PASID interface.
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the PCI PRI and PASID interface.
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config AMD_IOMMU_DEBUGFS
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bool "Enable AMD IOMMU internals in DebugFS"
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depends on AMD_IOMMU && IOMMU_DEBUGFS
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---help---
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!!!WARNING!!! !!!WARNING!!! !!!WARNING!!! !!!WARNING!!!
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DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!!
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Exposes AMD IOMMU device internals in DebugFS.
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This option is -NOT- intended for production environments, and should
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not generally be enabled.
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# Intel IOMMU support
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# Intel IOMMU support
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config DMAR_TABLE
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config DMAR_TABLE
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bool
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bool
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@ -11,6 +11,7 @@ obj-$(CONFIG_IOMMU_IOVA) += iova.o
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obj-$(CONFIG_OF_IOMMU) += of_iommu.o
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obj-$(CONFIG_OF_IOMMU) += of_iommu.o
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obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o
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obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o
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obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o
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obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o
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obj-$(CONFIG_AMD_IOMMU_DEBUGFS) += amd_iommu_debugfs.o
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obj-$(CONFIG_AMD_IOMMU_V2) += amd_iommu_v2.o
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obj-$(CONFIG_AMD_IOMMU_V2) += amd_iommu_v2.o
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obj-$(CONFIG_ARM_SMMU) += arm-smmu.o
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obj-$(CONFIG_ARM_SMMU) += arm-smmu.o
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obj-$(CONFIG_ARM_SMMU_V3) += arm-smmu-v3.o
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obj-$(CONFIG_ARM_SMMU_V3) += arm-smmu-v3.o
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@ -0,0 +1,33 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* AMD IOMMU driver
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*
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* Copyright (C) 2018 Advanced Micro Devices, Inc.
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*
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* Author: Gary R Hook <gary.hook@amd.com>
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*/
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#include <linux/debugfs.h>
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#include <linux/iommu.h>
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#include <linux/pci.h>
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#include "amd_iommu_proto.h"
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#include "amd_iommu_types.h"
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static struct dentry *amd_iommu_debugfs;
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static DEFINE_MUTEX(amd_iommu_debugfs_lock);
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#define MAX_NAME_LEN 20
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void amd_iommu_debugfs_setup(struct amd_iommu *iommu)
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{
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char name[MAX_NAME_LEN + 1];
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mutex_lock(&amd_iommu_debugfs_lock);
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if (!amd_iommu_debugfs)
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amd_iommu_debugfs = debugfs_create_dir("amd",
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iommu_debugfs_dir);
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mutex_unlock(&amd_iommu_debugfs_lock);
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snprintf(name, MAX_NAME_LEN, "iommu%02d", iommu->index);
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iommu->debugfs = debugfs_create_dir(name, amd_iommu_debugfs);
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}
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@ -2721,6 +2721,7 @@ int __init amd_iommu_enable_faulting(void)
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*/
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*/
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static int __init amd_iommu_init(void)
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static int __init amd_iommu_init(void)
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{
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{
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struct amd_iommu *iommu;
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int ret;
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int ret;
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ret = iommu_go_to_state(IOMMU_INITIALIZED);
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ret = iommu_go_to_state(IOMMU_INITIALIZED);
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@ -2730,14 +2731,15 @@ static int __init amd_iommu_init(void)
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disable_iommus();
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disable_iommus();
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free_iommu_resources();
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free_iommu_resources();
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} else {
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} else {
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struct amd_iommu *iommu;
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uninit_device_table_dma();
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uninit_device_table_dma();
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for_each_iommu(iommu)
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for_each_iommu(iommu)
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iommu_flush_all_caches(iommu);
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iommu_flush_all_caches(iommu);
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}
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}
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}
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}
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for_each_iommu(iommu)
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amd_iommu_debugfs_setup(iommu);
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return ret;
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return ret;
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}
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}
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@ -33,6 +33,12 @@ extern void amd_iommu_uninit_devices(void);
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extern void amd_iommu_init_notifier(void);
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extern void amd_iommu_init_notifier(void);
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extern int amd_iommu_init_api(void);
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extern int amd_iommu_init_api(void);
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#ifdef CONFIG_AMD_IOMMU_DEBUGFS
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void amd_iommu_debugfs_setup(struct amd_iommu *iommu);
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#else
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static inline void amd_iommu_debugfs_setup(struct amd_iommu *iommu) {}
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#endif
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/* Needed for interrupt remapping */
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/* Needed for interrupt remapping */
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extern int amd_iommu_prepare(void);
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extern int amd_iommu_prepare(void);
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extern int amd_iommu_enable(void);
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extern int amd_iommu_enable(void);
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@ -594,6 +594,11 @@ struct amd_iommu {
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u32 flags;
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u32 flags;
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volatile u64 __aligned(8) cmd_sem;
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volatile u64 __aligned(8) cmd_sem;
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#ifdef CONFIG_AMD_IOMMU_DEBUGFS
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/* DebugFS Info */
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struct dentry *debugfs;
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#endif
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};
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};
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static inline struct amd_iommu *dev_to_amd_iommu(struct device *dev)
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static inline struct amd_iommu *dev_to_amd_iommu(struct device *dev)
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