Re: [PATCH v4 06/18] PCI/P2PDMA: Gate the host bridge whitelist warning on verbose

[sashiko-bot@kernel.org]

> From: Leon Romanovsky <leonro@nvidia.com>
> 
> calc_map_type_and_dist() prints every other diagnostic under its verbose
> argument, but reaches the "Host bridge not in P2PDMA whitelist" warning
> through host_bridge_whitelist(), which it hands acs_redirects instead.
> A caller that asked for a silent answer still gets the warning whenever
> any port on the path has an ACS redirect bit set, the CPU is not
> whitelisted by cpu_supports_p2pdma(), and the host bridge is not in
> pci_p2pdma_whitelist[].
> 
> pci_p2pmem_find_many() is such a caller. It sweeps every device with
> published p2pmem and asks for the distance to each client with
> verbose=false, and pci_p2pdma_distance_many() recomputes rather than
> consulting the map_types cache, so the warning repeats on every sweep.
> 
> [ ... ]
> which vendor and device would have to be added to the whitelist.
> 
> Tested-by: Tushar Dave <tdave@nvidia.com>
> Fixes: d1b8dc09dd71 ("PCI/P2PDMA: Simplify distance calculation")
> 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/20260821-fix-p2p-acs-v4-0-v4-0-94426b96de73@nvidia.com?part=6