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Commit 7f6db171 authored by Shuah Khan's avatar Shuah Khan Committed by Joerg Roedel
Browse files

iommu: Add event tracing feature to iommu 



Add tracing feature to iommu to report various iommu events. Classes
iommu_group, iommu_device, and iommu_map_unmap are defined.

iommu_group class events can be enabled to trigger when devices get added
to and removed from an iommu group. Trace information includes iommu group
id and device name.

iommu:add_device_to_group
iommu:remove_device_from_group

iommu_device class events can be enabled to trigger when devices are attached
to and detached from a domain. Trace information includes device name.

iommu:attach_device_to_domain
iommu:detach_device_from_domain

iommu_map_unmap class events can be enabled to trigger when iommu map and
unmap iommu ops. Trace information includes iova, physical address (map event
only), and size.

iommu:map
iommu:unmap

Signed-off-by: default avatarShuah Khan <shuah.kh@samsung.com>
Signed-off-by: default avatarJoerg Roedel <joro@8bytes.org>
parent 4a10c2ac

drivers/iommu/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_IOMMU_API) += iommu.o

obj-$(CONFIG_IOMMU_API) += iommu-traces.o

obj-$(CONFIG_OF_IOMMU)	+= of_iommu.o

obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o msm_iommu_dev.o

obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o

drivers/iommu/iommu-traces.c

0 → 100644
+24 −0
Original line number Diff line number Diff line 
/*

 * iommu trace points

 *

 * Copyright (C) 2013 Shuah Khan <shuah.kh@samsung.com>

 *

 */



#include <linux/string.h>

#include <linux/types.h>



#define CREATE_TRACE_POINTS

#include <trace/events/iommu.h>



/* iommu_group_event */

EXPORT_TRACEPOINT_SYMBOL_GPL(add_device_to_group);

EXPORT_TRACEPOINT_SYMBOL_GPL(remove_device_from_group);



/* iommu_device_event */

EXPORT_TRACEPOINT_SYMBOL_GPL(attach_device_to_domain);

EXPORT_TRACEPOINT_SYMBOL_GPL(detach_device_from_domain);



/* iommu_map_unmap */

EXPORT_TRACEPOINT_SYMBOL_GPL(map);

EXPORT_TRACEPOINT_SYMBOL_GPL(unmap);

drivers/iommu/iommu.c

+1 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
#include <linux/idr.h>

#include <linux/notifier.h>

#include <linux/err.h>

#include <trace/events/iommu.h>



static struct kset *iommu_group_kset;

static struct ida iommu_group_ida;

include/trace/events/iommu.h

0 → 100644
+129 −0
Original line number Diff line number Diff line 
/*

 * iommu trace points

 *

 * Copyright (C) 2013 Shuah Khan <shuah.kh@samsung.com>

 *

 */

#undef TRACE_SYSTEM

#define TRACE_SYSTEM iommu



#if !defined(_TRACE_IOMMU_H) || defined(TRACE_HEADER_MULTI_READ)

#define _TRACE_IOMMU_H



#include <linux/tracepoint.h>

#include <linux/pci.h>



struct device;



DECLARE_EVENT_CLASS(iommu_group_event,



	TP_PROTO(int group_id, struct device *dev),



	TP_ARGS(group_id, dev),



	TP_STRUCT__entry(

		__field(int, gid)

		__string(device, dev_name(dev))

	),



	TP_fast_assign(

		__entry->gid = group_id;

		__assign_str(device, dev_name(dev));

	),



	TP_printk("IOMMU: groupID=%d device=%s",

			__entry->gid, __get_str(device)

	)

);



DEFINE_EVENT(iommu_group_event, add_device_to_group,



	TP_PROTO(int group_id, struct device *dev),



	TP_ARGS(group_id, dev)



);



DEFINE_EVENT(iommu_group_event, remove_device_from_group,



	TP_PROTO(int group_id, struct device *dev),



	TP_ARGS(group_id, dev)

);



DECLARE_EVENT_CLASS(iommu_device_event,



	TP_PROTO(struct device *dev),



	TP_ARGS(dev),



	TP_STRUCT__entry(

		__string(device, dev_name(dev))

	),



	TP_fast_assign(

		__assign_str(device, dev_name(dev));

	),



	TP_printk("IOMMU: device=%s", __get_str(device)

	)

);



DEFINE_EVENT(iommu_device_event, attach_device_to_domain,



	TP_PROTO(struct device *dev),



	TP_ARGS(dev)

);



DEFINE_EVENT(iommu_device_event, detach_device_from_domain,



	TP_PROTO(struct device *dev),



	TP_ARGS(dev)

);



DECLARE_EVENT_CLASS(iommu_map_unmap,



	TP_PROTO(unsigned long iova, phys_addr_t paddr, size_t size),



	TP_ARGS(iova, paddr, size),



	TP_STRUCT__entry(

		__field(u64, iova)

		__field(u64, paddr)

		__field(int, size)

	),



	TP_fast_assign(

		__entry->iova = iova;

		__entry->paddr = paddr;

		__entry->size = size;

	),



	TP_printk("IOMMU: iova=0x%016llx paddr=0x%016llx size=0x%x",

			__entry->iova, __entry->paddr, __entry->size

	)

);



DEFINE_EVENT(iommu_map_unmap, map,



	TP_PROTO(unsigned long iova, phys_addr_t paddr, size_t size),



	TP_ARGS(iova, paddr, size)

);



DEFINE_EVENT_PRINT(iommu_map_unmap, unmap,



	TP_PROTO(unsigned long iova, phys_addr_t paddr, size_t size),



	TP_ARGS(iova, paddr, size),



	TP_printk("IOMMU: iova=0x%016llx size=0x%x",

			__entry->iova, __entry->size

	)

);

#endif /* _TRACE_IOMMU_H */



/* This part must be outside protection */

#include <trace/define_trace.h>