Messages in this thread | | | Date | Fri, 10 Jun 2022 16:37:54 +0100 | Subject | Re: [PATCH v3 3/4] scsi: core: Cap shost max_sectors according to DMA optimum mapping limits | From | John Garry <> |
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On 09/06/2022 21:34, Bart Van Assche wrote: > On 6/9/22 10:54, John Garry wrote: >> ok, but do you have a system where the UFS host controller is behind >> an IOMMU? I had the impression that UFS controllers would be mostly >> found in embedded systems and IOMMUs are not as common on there. > > Modern phones have an IOMMU. Below one can find an example from a Pixel > 6 phone. The UFS storage controller is not controller by the IOMMU as > far as I can see but I wouldn't be surprised if the security team would > ask us one day to enable the IOMMU for the UFS controller.
OK, then unfortunately it seems that you have no method to test. I might be able to test USB MSC but I am not even sure if I can even get DMA mappings who length exceeds the IOVA rcache limit there.
Thanks, John
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