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iommu/vt-d: Enable base Intel IOMMU debugfs support
Add a new config option CONFIG_INTEL_IOMMU_DEBUGFS and do the base enabling for Intel IOMMU debugfs. Cc: Lu Baolu <baolu.lu@linux.intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Ashok Raj <ashok.raj@intel.com> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com> Co-Developed-by: Gayatri Kammela <gayatri.kammela@intel.com> Signed-off-by: Gayatri Kammela <gayatri.kammela@intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Sohil Mehta <sohil.mehta@intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -186,6 +186,19 @@ config INTEL_IOMMU
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and include PCI device scope covered by these DMA
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remapping devices.
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config INTEL_IOMMU_DEBUGFS
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bool "Export Intel IOMMU internals in Debugfs"
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depends on INTEL_IOMMU && IOMMU_DEBUGFS
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help
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!!!WARNING!!!
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DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!!!
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Expose Intel IOMMU internals in Debugfs.
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This option is -NOT- intended for production environments, and should
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only be enabled for debugging Intel IOMMU.
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config INTEL_IOMMU_SVM
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bool "Support for Shared Virtual Memory with Intel IOMMU"
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depends on INTEL_IOMMU && X86
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@ -17,6 +17,7 @@ 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-$(CONFIG_DMAR_TABLE) += dmar.o
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obj-$(CONFIG_INTEL_IOMMU) += intel-iommu.o intel-pasid.o
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obj-$(CONFIG_INTEL_IOMMU_DEBUGFS) += intel-iommu-debugfs.o
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obj-$(CONFIG_INTEL_IOMMU_SVM) += intel-svm.o
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obj-$(CONFIG_IPMMU_VMSA) += ipmmu-vmsa.o
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obj-$(CONFIG_IRQ_REMAP) += intel_irq_remapping.o irq_remapping.o
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20
drivers/iommu/intel-iommu-debugfs.c
Normal file
20
drivers/iommu/intel-iommu-debugfs.c
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@ -0,0 +1,20 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright © 2018 Intel Corporation.
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*
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* Authors: Gayatri Kammela <gayatri.kammela@intel.com>
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* Sohil Mehta <sohil.mehta@intel.com>
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* Jacob Pan <jacob.jun.pan@linux.intel.com>
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*/
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#include <linux/debugfs.h>
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#include <linux/dmar.h>
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#include <linux/intel-iommu.h>
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#include <linux/pci.h>
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#include <asm/irq_remapping.h>
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void __init intel_iommu_debugfs_init(void)
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{
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debugfs_create_dir("intel", iommu_debugfs_dir);
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}
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@ -4837,6 +4837,7 @@ int __init intel_iommu_init(void)
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cpuhp_setup_state(CPUHP_IOMMU_INTEL_DEAD, "iommu/intel:dead", NULL,
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intel_iommu_cpu_dead);
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intel_iommu_enabled = 1;
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intel_iommu_debugfs_init();
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return 0;
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@ -621,6 +621,12 @@ extern int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_
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extern struct intel_iommu *intel_svm_device_to_iommu(struct device *dev);
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#endif
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#ifdef CONFIG_INTEL_IOMMU_DEBUGFS
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void intel_iommu_debugfs_init(void);
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#else
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static inline void intel_iommu_debugfs_init(void) {}
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#endif /* CONFIG_INTEL_IOMMU_DEBUGFS */
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extern const struct attribute_group *intel_iommu_groups[];
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bool context_present(struct context_entry *context);
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struct context_entry *iommu_context_addr(struct intel_iommu *iommu, u8 bus,
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