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Commit 02ce686c authored by Charan Teja Reddy's avatar Charan Teja Reddy
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iommu: arm-smmu: dump tbu pwr status in tlb sync timeout 



TBU pwr status can help debug TLB sync timeout issues. Dump it as part
of TLB sync timeout handler.

Change-Id: I31c86f76820839e8b29287e76e17d64a3f682a03
Signed-off-by: default avatarCharan Teja Reddy <charante@codeaurora.org>
parent 890d639f

drivers/iommu/arm-smmu-regs.h

+1 −0
Original line number Diff line number Diff line
@@ -192,6 +192,7 @@ enum arm_smmu_s2cr_privcfg { 
#define ARM_SMMU_CB_ATS1PR		0x800

#define ARM_SMMU_CB_ATSR		0x8f0

#define ARM_SMMU_STATS_SYNC_INV_TBU_ACK 0x25dc

#define ARM_SMMU_TBU_PWR_STATUS         0x2204



#define SCTLR_SHCFG_SHIFT		22

#define SCTLR_SHCFG_MASK		0x3

drivers/iommu/arm-smmu.c

+5 −4
Original line number Diff line number Diff line
@@ -1103,7 +1103,7 @@ static int __arm_smmu_tlb_sync(struct arm_smmu_device *smmu, 
				void __iomem *sync, void __iomem *status)

{

	unsigned int spin_cnt, delay;

	u32 sync_inv_ack;

	u32 sync_inv_ack, tbu_pwr_status;



	writel_relaxed(0, sync);

	for (delay = 1; delay < TLB_LOOP_TIMEOUT; delay *= 2) {
@@ -1116,12 +1116,13 @@ static int __arm_smmu_tlb_sync(struct arm_smmu_device *smmu, 
	}

	sync_inv_ack = scm_io_read((unsigned long)(smmu->phys_addr +

				     ARM_SMMU_STATS_SYNC_INV_TBU_ACK));

	tbu_pwr_status = scm_io_read((unsigned long)(smmu->phys_addr +

				     ARM_SMMU_TBU_PWR_STATUS));

	trace_tlbsync_timeout(smmu->dev, 0);

	dev_err_ratelimited(smmu->dev,

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

			    sync_inv_ack);

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

			    sync_inv_ack, tbu_pwr_status);

	BUG_ON(IS_ENABLED(CONFIG_IOMMU_TLBSYNC_DEBUG));



	return -EINVAL;

}