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iommu/arm-smmu-v3: Ratelimit event dump 

When a device or driver misbehaves, it is possible to receive DMA fault
events much faster than we can print them out, causing a lock up of the
system and inability to cancel the source of the problem. Ratelimit
printing of events to help recovery.

Tested-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Link: https://lore.kernel.org/r/20210531095648.118282-1-jean-philippe@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Jean-Philippe Brucker 2021-05-31 11:56:50 +02:00 committed by Will Deacon
parent 395ad89d11
commit 9cff922bba
1 changed files with 3 additions and 1 deletions
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4
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
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@ -1518,6 +1518,8 @@ static irqreturn_t arm_smmu_evtq_thread(int irq, void *dev)
struct arm_smmu_device *smmu = dev;
struct arm_smmu_queue *q = &smmu->evtq.q;
struct arm_smmu_ll_queue *llq = &q->llq;
static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
u64 evt[EVTQ_ENT_DWORDS];
do {
@ -1525,7 +1527,7 @@ static irqreturn_t arm_smmu_evtq_thread(int irq, void *dev)
u8 id = FIELD_GET(EVTQ_0_ID, evt[0]);
ret = arm_smmu_handle_evt(smmu, evt);
if (!ret)
if (!ret || !__ratelimit(&rs))
continue;
dev_info(smmu->dev, "event 0x%02x received:\n", id);