Re: [PATCH v3 3/4] scsi: core: Cap shost max_sectors according to DMA optimum mapping limits

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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.

# (cd /sys/class/iommu && ls */devices)
1a090000.sysmmu/devices:
19000000.aoc

1a510000.sysmmu/devices:
1a440000.lwis_csi

1a540000.sysmmu/devices:
1aa40000.lwis_pdp

1a880000.sysmmu/devices:
1a840000.lwis_g3aa

1ad00000.sysmmu/devices:
1ac40000.lwis_ipp  1ac80000.lwis_gtnr_align

1b080000.sysmmu/devices:
1b450000.lwis_itp

1b780000.sysmmu/devices:

1b7b0000.sysmmu/devices:
1b760000.lwis_mcsc

1b7e0000.sysmmu/devices:

1baa0000.sysmmu/devices:
1a4e0000.lwis_votf  1ba40000.lwis_gdc

1bad0000.sysmmu/devices:
1ba60000.lwis_gdc

1bb00000.sysmmu/devices:
1ba80000.lwis_scsc

1bc70000.sysmmu/devices:
1bc40000.lwis_gtnr_merge

1bca0000.sysmmu/devices:

1bcd0000.sysmmu/devices:

1bd00000.sysmmu/devices:

1bd30000.sysmmu/devices:

1c100000.sysmmu/devices:
1c300000.drmdecon  1c302000.drmdecon

1c110000.sysmmu/devices:

1c120000.sysmmu/devices:

1c660000.sysmmu/devices:
1c640000.g2d

1c690000.sysmmu/devices:

1c710000.sysmmu/devices:
1c700000.smfc

1c870000.sysmmu/devices:
1c8d0000.MFC-0  mfc

1c8a0000.sysmmu/devices:

1ca40000.sysmmu/devices:
1cb00000.bigocean

1cc40000.sysmmu/devices:
1ce00000.abrolhos

Bart.



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