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authorShuah Khan <shuah.kh@samsung.com>2013-08-15 11:59:23 -0600
committerJoerg Roedel <joro@8bytes.org>2013-09-24 12:35:24 +0200
commit7f6db1717235bd45d265766dad53c10d30899d41 (patch)
treebee0c7f789d27258e61f795631243bf971c0132e /drivers/iommu
parent4a10c2ac2f368583138b774ca41fac4207911983 (diff)
downloadlinux-7f6db1717235bd45d265766dad53c10d30899d41.tar.bz2
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: Shuah Khan <shuah.kh@samsung.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/Makefile1
-rw-r--r--drivers/iommu/iommu-traces.c24
-rw-r--r--drivers/iommu/iommu.c1
3 files changed, 26 insertions, 0 deletions
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index 14c1f474cf11..5d58bf16e9e3 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -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
diff --git a/drivers/iommu/iommu-traces.c b/drivers/iommu/iommu-traces.c
new file mode 100644
index 000000000000..a2af60f31810
--- /dev/null
+++ b/drivers/iommu/iommu-traces.c
@@ -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);
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index fbe9ca734f8f..58f6a16b2e1a 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -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;