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Commit 7d0f5fd3 authored by Gary R Hook's avatar Gary R Hook Committed by Joerg Roedel
Browse files

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: default avatarGary R Hook <gary.hook@amd.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent bad614b2

drivers/iommu/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -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

drivers/iommu/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/iommu/amd_iommu_debugfs.c

0 → 100644
+33 −0
Original line number Diff line number Diff line 
// 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);

}

drivers/iommu/amd_iommu_init.c

+4 −2
Original line number Diff line number Diff line
@@ -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;

}

drivers/iommu/amd_iommu_proto.h

+6 −0
Original line number Diff line number Diff line
@@ -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);