dear Bjorn,
I understand the confusion. I quite messed up the bug report. Sorry.
The problem is that lspci with kernel 4.17-rc1 shows exactly the same behaviour when no
workaround is applied.
the lspci is from 4.17-rc1 with the workaround applied, but by default, it shows the same output
as 4.14.27
kind regards,
Janpieter Sollie
On 24-04-18 19:31, Bjorn Helgaas wrote:
Thanks for the report!
I don't understand exactly what the issue is yet. You attached lspci
output from v4.14.27 and v4.17-rc1. The v4.17-rc1 output shows several
devices (4b:00, 4c:00, 4f:00) below the PEX switch, while the v4.14.27
output shows only the 4f:00 devices.
Is the problem that v4.14.27 doesn't find the 4b:00 and 4c:00 devices?
Does v4.17-rc1 work correctly?
If v4.17-rc1 works but v4.14.27 does not, it's probably a question of
working with your distro to see if they can (1) identify some change that
fixed things, and (2) backport that change to the distro kernel.
The Broadcom driver you attached at comment #4 shouldn't be related to this
problem. Device enumeration is performed by the PCI core and doesn't
require any additional drivers. I didn't look at the Broadcom driver, so I
don't know what it does. The PEX switch does include an endpoint
(42:00.1); it's possible the driver is for some functionality provided by
that endpoint.
---------- Forwarded message ---------
From: <bugzilla-daemon@xxxxxxxxxxxxxxxxxxx>
Date: Mon, Apr 23, 2018 at 12:20 AM
Subject: [Bug 199473] New: pcieport does not scan devices behind PEX
switch, while resources are allocated
To: <bhelgaas@xxxxxxxxxx>
https://bugzilla.kernel.org/show_bug.cgi?id=199473
Bug ID: 199473
Summary: pcieport does not scan devices behind PEX switch,
while resources are allocated
Product: Drivers
Version: 2.5
Kernel Version: 4.17-rc1
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: PCI
Assignee: drivers_pci@xxxxxxxxxxxxxxxxxxxx
Reporter: janpieter.sollie@xxxxxxxxx
Regression: No
Created attachment 275511
--> https://bugzilla.kernel.org/attachment.cgi?id=275511&action=edit
dmesg stable kernel
pcieport assigns the PEX 8619 pcie expander switch ports, but does not scan
them for additional objects behind the ports. only 1 device is added @ pci
region 4f. Workaround for getting all devices online: while pc is on,
remove
the card, reinsert it at a slot before the working device, and make a cold
start.
It would be nice if the pcie switches are scanned properly.
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