Re: [PATCH v12 01/19] PCI/P2PDMA: Honor device-specific ACS redirection

[sashiko-bot@kernel.org]

> From: Leon Romanovsky <leonro@nvidia.com>
> 
> Some ports, such as Zhaoxin Switch Downstream Ports, redirect peer-to-peer
> traffic without an ACS capability, as their device-specific ACS quirks
> report. P2PDMA reads only ACS Control, so below such a port it hands out
> bus addresses for traffic that goes to the host bridge.
> 
> Take Request and Completion Redirect from a bridge's quirk too. Ignore
> endpoint quirks, which only describe traffic between an endpoint's own
> functions. Skip bridges on a root bus: they never sit between two peers,
> and the AMD southbridge quirk may sleep there during DMA mapping.
> 
> pci=disable_acs_redir= cannot override a quirk, so name such ports
> separately.
> 
> Fixes: 52916982af48 ("PCI/P2PDMA: Support peer-to-peer memory")
> Signed-off-by: Leon Romanovsky <leonro@nvidia.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261103-fix-p2p-acs-v4-0-v12-0-912101f93517@nvidia.com?part=1