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iommu: Add event tracing feature to iommu

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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: Shuah Khan <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>
This commit is contained in:
Shuah Khan 2013-08-15 11:59:23 -06:00 • committed by Joerg Roedel
commit 7f6db17172
4 changed files with 155 additions and 0 deletions
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1
drivers/iommu/Makefile
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@ -1,4 +1,5 @@
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

24
drivers/iommu/iommu-traces.c Normal file
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@ -0,0 +1,24 @@
/*
* 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);

1
drivers/iommu/iommu.c
View file

@ -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;