From: Logan Gunthorpe <logang@deltatee.com>
To: Leon Romanovsky <leon@kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Shuah Khan <skhan@linuxfoundation.org>,
Alex Williamson <alex@shazbot.org>
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org
Subject: Re: [PATCH 02/13] PCI/P2PDMA: Report ACS ports when the paths share no upstream bridge
Date: Tue, 4 Aug 2026 13:52:22 -0600 [thread overview]
Message-ID: <f1ec8777-b747-4c35-860d-cde520f9b3f5@deltatee.com> (raw)
In-Reply-To: <20260802-fix-p2p-acs-v1-2-a7c5eb64fff6@nvidia.com>
On 2026-08-02 09:09, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@nvidia.com>
>
> A provider and a client below different Root Ports share no upstream
> bridge, so the search ends without a match and the walk takes the
> host-bridge route directly. Neither path is examined for ACS, so no
> redirect diagnostic is emitted and the host-bridge whitelist warning
> stays suppressed.
>
> Examine the paths before taking that route, so every redirecting port is
> named in the pci=disable_acs_redir= hint. The mapping type is unchanged.
>
> Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Thanks! I vaguely remember I might have got hit by this bug a long time
ago and didn't know why. The fix looks good.
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
next prev parent reply other threads:[~2026-08-04 19:52 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-02 15:09 [PATCH 00/13] PCI/P2PDMA: Fix ACS egress control handling Leon Romanovsky
2026-08-02 15:09 ` [PATCH 01/13] PCI/P2PDMA: Safely terminate ACS redirect lists Leon Romanovsky
2026-08-04 19:49 ` Logan Gunthorpe
2026-08-02 15:09 ` [PATCH 02/13] PCI/P2PDMA: Report ACS ports when the paths share no upstream bridge Leon Romanovsky
2026-08-04 19:52 ` Logan Gunthorpe [this message]
2026-08-02 15:09 ` [PATCH 03/13] PCI/P2PDMA: Document the Address Type assumption Leon Romanovsky
2026-08-04 19:55 ` Logan Gunthorpe
2026-08-02 15:09 ` [PATCH 04/13] PCI: Account for Direct Translated P2P in ACS isolation checks Leon Romanovsky
2026-08-04 20:03 ` Logan Gunthorpe
2026-08-02 15:09 ` [PATCH 05/13] PCI: Add ACS egress control vector accessor Leon Romanovsky
2026-08-04 21:55 ` Logan Gunthorpe
2026-08-02 15:09 ` [PATCH 06/13] PCI: Account for ACS egress control in isolation checks Leon Romanovsky
2026-08-04 21:55 ` Logan Gunthorpe
2026-08-02 15:09 ` [PATCH 07/13] PCI/P2PDMA: Derive peer-to-peer routing from ACS control bits Leon Romanovsky
2026-08-04 21:55 ` Logan Gunthorpe
2026-08-04 21:58 ` Logan Gunthorpe
2026-08-02 15:09 ` [PATCH 08/13] PCI/P2PDMA: Honor ACS egress control vectors Leon Romanovsky
2026-08-04 21:56 ` Logan Gunthorpe
2026-08-02 15:09 ` [PATCH 09/13] PCI/P2PDMA: Document ACS egress control handling Leon Romanovsky
2026-08-04 22:01 ` Logan Gunthorpe
2026-08-05 9:02 ` Leon Romanovsky
2026-08-02 15:09 ` [PATCH 10/13] PCI/P2PDMA: Extract pure ACS routing decision helpers Leon Romanovsky
2026-08-04 22:07 ` Logan Gunthorpe
2026-08-05 9:06 ` Leon Romanovsky
2026-08-02 15:09 ` [PATCH 11/13] PCI/P2PDMA: Add KUnit tests for ACS routing decisions Leon Romanovsky
2026-08-04 22:37 ` Logan Gunthorpe
2026-08-02 15:09 ` [PATCH 12/13] PCI/P2PDMA: Add KUnit coverage for the ACS P2P routing walk Leon Romanovsky
2026-08-04 22:37 ` Logan Gunthorpe
2026-08-02 15:09 ` [PATCH 13/13] PCI: Add KUnit coverage for ACS isolation checks Leon Romanovsky
2026-08-04 22:38 ` Logan Gunthorpe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=f1ec8777-b747-4c35-860d-cde520f9b3f5@deltatee.com \
--to=logang@deltatee.com \
--cc=alex@shazbot.org \
--cc=bhelgaas@google.com \
--cc=corbet@lwn.net \
--cc=leon@kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=skhan@linuxfoundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox