linux-kernel - [PATCH AUTOSEL 4.9 02/43] iommu/arm-smmu-v3: sync the OVACKFLG to PRIQ consumer register

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Date:   Fri, 7 Sep 2018 00:38:20 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Miao Zhong <zhongmiao@...ilicon.com>,
        Will Deacon <will.deacon@....com>,
        Robin Murphy <robin.murphy@....com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.9 02/43] iommu/arm-smmu-v3: sync the OVACKFLG to
 PRIQ consumer register

From: Miao Zhong <zhongmiao@...ilicon.com>

[ Upstream commit 0d535967ac658966c6ade8f82b5799092f7d5441 ]

When PRI queue occurs overflow, driver should update the OVACKFLG to
the PRIQ consumer register, otherwise subsequent PRI requests will not
be processed.

Cc: Will Deacon <will.deacon@....com>
Cc: Robin Murphy <robin.murphy@....com>
Signed-off-by: Miao Zhong <zhongmiao@...ilicon.com>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/iommu/arm-smmu-v3.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 7f294f785ce6..ff4be1174ff0 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1233,6 +1233,7 @@ static irqreturn_t arm_smmu_priq_thread(int irq, void *dev)
 
 	/* Sync our overflow flag, as we believe we're up to speed */
 	q->cons = Q_OVF(q, q->prod) | Q_WRP(q, q->cons) | Q_IDX(q, q->cons);
+	writel(q->cons, q->cons_reg);
 	return IRQ_HANDLED;
 }
 
-- 
2.17.1