In message: [linux-yocto][v5.10/standard/base][PATCH] iommu/arm-smmu-v3: Ratelimit event dump on 20/10/2021 Yanfei Xu wrote:
> From: Jean-Philippe Brucker <[email protected]> > > 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 <[email protected]> > Signed-off-by: Jean-Philippe Brucker <[email protected]> > Link: > https://lore.kernel.org/r/[email protected] Has this also been proposed for -stable inclusion ? I've merged this regardless .. I'm just trying to determine if I should expect a conflict in the future. Bruce > Signed-off-by: Will Deacon <[email protected]> > > Back ported for 5.10 > Signed-off-by: Yanfei Xu <[email protected]> > --- > 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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