diff options
| author | Jean-Philippe Brucker <jean-philippe@linaro.org> | 2021-05-31 11:56:50 +0200 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-06-08 12:35:55 +0100 |
| commit | 9cff922bba429b310507eac3b6cb5eb1b57e9ad1 (patch) | |
| tree | be546ef596580b480bd6398d12b0fc8e58acefa6 /drivers/iommu/arm | |
| parent | 395ad89d11fd93f79a6b942e91fc409807a63c4b (diff) | |
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>
Diffstat (limited to 'drivers/iommu/arm')
| -rw-r--r-- | drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index 67866bb2b3fd..9ca9c5373591 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -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); |