From: Jean-Philippe Brucker <jean-phili...@linaro.org> 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.koski...@nokia.com> Signed-off-by: Jean-Philippe Brucker <jean-phili...@linaro.org> Link: https://lore.kernel.org/r/20210531095648.118282-1-jean-phili...@linaro.org Signed-off-by: Will Deacon <w...@kernel.org> Back ported for 5.10 Signed-off-by: Yanfei Xu <yanfei...@windriver.com> --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 5 +++++ 1 file changed, 5 insertions(+) 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 7067b7c11626..75ce920c1a30 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -1358,11 +1358,16 @@ static irqreturn_t arm_smmu_evtq_thread(int irq, void *dev) struct arm_smmu_queue *q = &smmu->evtq.q; struct arm_smmu_ll_queue *llq = &q->llq; u64 evt[EVTQ_ENT_DWORDS]; + static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, + DEFAULT_RATELIMIT_BURST); do { while (!queue_remove_raw(q, evt)) { u8 id = FIELD_GET(EVTQ_0_ID, evt[0]); + if (!__ratelimit(&rs)) + continue; + dev_info(smmu->dev, "event 0x%02x received:\n", id); for (i = 0; i < ARRAY_SIZE(evt); ++i) dev_info(smmu->dev, "\t0x%016llx\n", -- 2.27.0
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