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Date: Thu, 10 Sep 2026 18:25:14 +0300
From: Leon Romanovsky <leon@kernel.org>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	Logan Gunthorpe <logang@deltatee.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jens Axboe <axboe@kernel.dk>, Chaitanya Kulkarni <kch@nvidia.com>,
	Jason Gunthorpe <jgg@ziepe.ca>, Ankit Agrawal <ankita@nvidia.com>,
	Alex Williamson <alex@shazbot.org>, linux-pci@vger.kernel.org,
	linux-kernel@vger.kernel.org, Tushar Dave <tdave@nvidia.com>,
	Jason Gunthorpe <jgg@nvidia.com>
Subject: Re: [PATCH 5/5] PCI/P2PDMA: Gate the host bridge whitelist warning
 on verbose
Message-ID: <20260910152514.GT13683@unreal>
References: <20260830-batch-p2p-fixes-v1-5-5044e8dfbe2e@nvidia.com>
 <20260909021859.GA159841@bhelgaas>
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In-Reply-To: <20260909021859.GA159841@bhelgaas>

On Tue, Sep 08, 2026 at 09:18:59PM -0500, Bjorn Helgaas wrote:
> On Sun, Aug 30, 2026 at 02:16:23PM +0300, Leon Romanovsky wrote:
> > 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[].
> 
> Not in this series, but I would like to see the "whitelist" term
> removed from drivers/pci.  p2pdma.c and pci-pf-stub.c are the only
> current uses, and I don't think a change would cause any API issue.

Let's do it after the "Fix ACS ..." series, please, just to reduce the
number of rebases on my side.

Thanks

> 
> There are similar "blacklist" uses in pci.c, aspm.c, and vpd.c.
>