linux-kernel - [bugzilla-daemon@...nel.org: [Bug 217251] New: pciehp: nvme not visible after re-insert to tbt port]

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Date:   Mon, 27 Mar 2023 09:33:59 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Lukas Wunner <lukas@...ner.de>
Cc:     Aleksander Trofimowicz <alex@....eu>, linux-pci@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [bugzilla-daemon@...nel.org: [Bug 217251] New: pciehp: nvme not
 visible after re-insert to tbt port]

Forwarding to NVMe folks, lists for visibility.

----- Forwarded message from bugzilla-daemon@...nel.org -----

https://bugzilla.kernel.org/show_bug.cgi?id=217251
...

Created attachment 304031
  --> https://bugzilla.kernel.org/attachment.cgi?id=304031&action=edit
the tracing of nvme_pci_enable() during re-insertion

Hi,

There is a JHL7540-based device that may host a NVMe device. After the first
insertion a nvme drive is properly discovered and handled by the relevant
modules. Once disconnected any further attempts are not successful. The device
is visible on a PCI bus, but nvme_pci_enable() ends up calling
pci_disable_device() every time; the runtime PM status of the device is
"suspended", the power status of the 04:01.0 PCI bridge is D3. Preventing the
device from being power managed ("on" -> /sys/devices/../power/control)
combined with device removal and pci rescan changes nothing. A host reboot
restores the initial state.

I would appreciate any suggestions how to debug it further.