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Commit 454ec002 authored by Charan Teja Reddy's avatar Charan Teja Reddy
Browse files

iommu: arm-smmu: improve tlbsync timeout debugging 



Call BUG() right after the first TLB sync timeout which will helps in
getting the system state information at that point of time that further
helps in debugging.

Change-Id: Id2d3eb491080b12486c99966da72afe2f6deefb4
Signed-off-by: default avatarCharan Teja Reddy <charante@codeaurora.org>
parent a74cb474

drivers/iommu/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -371,6 +371,16 @@ config ARM_SMMU_SELFTEST 


	  If unsure, say N here.



config IOMMU_TLBSYNC_DEBUG

	bool "TLB sync timeout debug"

	depends on ARM_SMMU

	help

	  Enables to collect the SMMU system state information right

	  after the first TLB sync timeout failure by calling BUG().

	  Note to use this only on debug builds.



	  If unsure, say N here.



config QCOM_LAZY_MAPPING

	bool "Reference counted iommu-mapping support"

	depends on ION

drivers/iommu/arm-smmu.c

+2 −0
Original line number Diff line number Diff line
@@ -1120,6 +1120,8 @@ static int __arm_smmu_tlb_sync(struct arm_smmu_device *smmu, 
	dev_err_ratelimited(smmu->dev,

			    "TLB sync timed out -- SMMU may be deadlocked, ack 0x%x\n",

			    sync_inv_ack);

	BUG_ON(IS_ENABLED(CONFIG_IOMMU_TLBSYNC_DEBUG));



	return -EINVAL;

}