Hi, On 24/07/18 12:45, Zhongmiao wrote: > Yeah, I haven't tested smmu eventq overflow , so i'm not sure if there > is any problem with smmu eventq. However, the code shows that there is also > a problem after the smmu eventq overflows. ^_^…….
>There really shouldn't be any problem with the eventq. Handling the event >overflow in my patch is mostly cosmetic and can be removed. See the Event >queue overflow section of the SMMUv3 specification (IHI0070B): >"Note: In terms of delivering events, a queue in an unacknowledged overflow >state does not behave any differently to normal queue state. If software were >to consume events and free space but leave overflow unacknowledged, new events >could be recorded." In the smmu v3 protocol , The processing of Priq overflow is different from that of Eventq. Thanks, Miao _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
