Re: [PATCH v11 18/19] PCI/P2PDMA: Evaluate the ATS path for clients with ATS enabled

[sashiko-bot@kernel.org]

> From: Leon Romanovsky <leonro@nvidia.com>
> 
> P2PDMA assumes every client issues Untranslated Requests. A device with
> ATS enabled may translate any address it is handed, including a bus
> address, and Translation Blocking can reject its Translated Requests on
> a route the Untranslated answer called usable.
> 
> Unless the client declared per-mapping ATS, take the Address Type from
> its ATS Enable bit. Never hand such a client bus addresses: only an IOVA
> survives translation, and whatever it issues untranslated goes through
> the host bridge, whose route must therefore be usable. Apply this after
> the topology-only cache, and in pci_p2pdma_distance_many() too, so that
> provider selection agrees with the mapping.
> 
> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> Signed-off-by: Leon Romanovsky <leonro@nvidia.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20261013-fix-p2p-acs-v4-0-v11-0-72cf8c96e617@nvidia.com?part=18