Messages in this thread | | | Subject | Re: [PATCH v2] arm64: do not set dma masks that device connection can't handle | From | Nikita Yushchenko <> | Date | Tue, 10 Jan 2017 17:01:58 +0300 |
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>> What issue "IOMMU doesn't solve"? >> >> Issue I'm trying to address is - inconsistency within swiotlb >> dma_map_ops, where (1) any wide mask is silently accepted, but (2) then >> mask is used to decide if bounce buffers are needed or not. This >> inconsistency causes NVMe+R-Car cobmo not working (and breaking memory >> instead). > > The fundamental underlying problem is the "any wide mask is silently > accepted" part, and that applies equally to IOMMU ops as well.
Is just posted version better?
It should cover iommu case as well.
Nikita
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