From: sashiko-bot@kernel.org
To: "Guixin Liu" <kanie@linux.alibaba.com>
Cc: linux-pci@vger.kernel.org
Subject: Re: [PATCH v1 2/2] PCI: Add pci=nobwctrl parameter to disable the PCIe bandwidth controller
Date: Wed, 29 Jul 2026 03:50:24 +0000 [thread overview]
Message-ID: <20260729035025.52BF21F000E9@smtp.kernel.org> (raw)
In-Reply-To: <20260729034505.469107-3-kanie@linux.alibaba.com>
> The PCIe bandwidth controller enables the Link Bandwidth Management
> Interrupt Enable (LBMIE) and Link Autonomous Bandwidth Interrupt Enable
> (LABIE) bits. On some (typically old) platforms this has been observed to
> cause boot hangs; commit 46a9f70e93ef ("PCI/bwctrl: Disable BW controller
> on Intel P45 using a quirk") addresses one such platform with a per-device
> quirk.
>
> Per-device quirks only help once the offending device has been identified
> and a quirk has shipped, which is awkward for a boot hang since the machine
> cannot be booted to report it. The only existing escape hatch,
> pcie_ports=compat, is a blunt instrument that also disables AER, PME,
> hotplug and DPC.
>
> Add a pci=nobwctrl boot option to disable just the bandwidth controller
> system-wide, giving users an immediate, rebuild-free workaround while a
> targeted quirk is worked out.
>
> Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260729034505.469107-1-kanie@linux.alibaba.com?part=2
next prev parent reply other threads:[~2026-07-29 3:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-29 3:45 [PATCH v1 0/2] PCI: Add pci=nobwctrl to disable the PCIe bandwidth controller Guixin Liu
2026-07-29 3:45 ` [PATCH v1 1/2] PCI/bwctrl: Add pci_bwctrl_available() Guixin Liu
2026-07-29 3:52 ` sashiko-bot
2026-07-29 3:45 ` [PATCH v1 2/2] PCI: Add pci=nobwctrl parameter to disable the PCIe bandwidth controller Guixin Liu
2026-07-29 3:50 ` sashiko-bot [this message]
2026-07-29 7:01 ` [PATCH v1 0/2] PCI: Add pci=nobwctrl " Lukas Wunner
2026-07-29 8:28 ` Guixin Liu
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=20260729035025.52BF21F000E9@smtp.kernel.org \
--to=sashiko-bot@kernel.org \
--cc=kanie@linux.alibaba.com \
--cc=linux-pci@vger.kernel.org \
--cc=sashiko-reviews@lists.linux.dev \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.