Messages in this thread | | | Subject | Re: [PATCH v3 0/6] Prerequisites for NXP LS104xA SMMU enablement | From | Robin Murphy <> | Date | Fri, 31 May 2019 18:03:30 +0100 |
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On 31/05/2019 17:33, Christoph Hellwig wrote: > On Thu, May 30, 2019 at 03:08:44PM -0700, David Miller wrote: >> From: laurentiu.tudor@nxp.com >> Date: Thu, 30 May 2019 17:19:45 +0300 >> >>> Depends on this pull request: >>> >>> http://lists.infradead.org/pipermail/linux-arm-kernel/2019-May/653554.html >> >> I'm not sure how you want me to handle this. > > The thing needs to be completely redone as it abuses parts of the > iommu API in a completely unacceptable way.
`git grep iommu_iova_to_phys drivers/{crypto,gpu,net}`
:(
I guess one alternative is for the offending drivers to maintain their own lookup tables of mapped DMA addresses - I think at least some of these things allow storing some kind of token in a descriptor, which even if it's not big enough for a virtual address might be sufficient for an index.
Robin.
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