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iommu/arm-smmu-v3: sync the OVACKFLG to PRIQ consumer register

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[ Upstream commit 0d535967ac ]

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@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Miao Zhong <zhongmiao@hisilicon.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miao Zhong
2018-07-23 20:56:58 +08:00
committed by Chris
parent 038163424c
commit 5cbfebe9a2
1 changed files with 1 additions and 0 deletions
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drivers/iommu/arm-smmu-v3.c
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@@ -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;
}