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Commit 40d8c86b authored by Sudarshan Rajagopalan's avatar Sudarshan Rajagopalan Committed by Liam Mark
Browse files

iommu: arm-smmu: Add smmu init latency measurement 



Ftrace event to print smmu init latency.

Change-Id: Ie8667a6cd7384347deae03a9ed998e2c198a3eb1
Signed-off-by: default avatarSudarshan Rajagopalan <sudaraja@codeaurora.org>
parent e49e0605

drivers/iommu/arm-smmu.c

+5 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ 
#include <soc/qcom/secure_buffer.h>

#include <linux/of_platform.h>

#include <linux/msm-bus.h>

#include <trace/events/iommu.h>

#include <dt-bindings/msm/msm-bus-ids.h>



#include <linux/amba/bus.h>
@@ -4735,10 +4736,12 @@ static int __init arm_smmu_init(void) 
{

	static bool registered;

	int ret = 0;

	ktime_t cur;



	if (registered)

		return 0;



	cur = ktime_get();

	ret = platform_driver_register(&qsmmuv500_tbu_driver);

	if (ret)

		return ret;
@@ -4748,6 +4751,8 @@ static int __init arm_smmu_init(void) 
	ret = register_iommu_sec_ptbl();

#endif

	registered = !ret;

	trace_smmu_init(ktime_us_delta(ktime_get(), cur));



	return ret;

}

include/trace/events/iommu.h

+18 −0
Original line number Diff line number Diff line
@@ -161,6 +161,24 @@ DEFINE_EVENT(iommu_error, io_page_fault, 


	TP_ARGS(dev, iova, flags)

);



TRACE_EVENT(smmu_init,



	TP_PROTO(u64 time),



	TP_ARGS(time),



	TP_STRUCT__entry(

		__field(u64, time)

	),



	TP_fast_assign(

		__entry->time = time;

	),



	TP_printk("ARM SMMU init latency: %lld us", __entry->time)

);



#endif /* _TRACE_IOMMU_H */



/* This part must be outside protection */