linux-kernel - Re: [BUG] Bisected Problem with LSI PCI FC Adapter

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Message-ID: <CAE9FiQUeP84585-4b+Y6WBVD3zqOi7ch_OXytsTmKEz9AyZ3Vg@mail.gmail.com>
Date:	Fri, 12 Sep 2014 18:59:23 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Dirk Gouders <dirk@...ders.net>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andreas Noever <andreas.noever@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [BUG] Bisected Problem with LSI PCI FC Adapter

On Fri, Sep 12, 2014 at 5:11 PM, Dirk Gouders <dirk@...ders.net> wrote:
> Yinghai Lu <yinghai@...nel.org> writes:
>
> Yes, I skip them in pci_scan_device() to get the unused bus number space
> that 0a.0 and 0b.0 then can use when reconfiguration is triggered.

That is not right. Can not let two bridges use same bus num.

>
>> Proper simulation could be:
>> 1. remove 07:00.0
>>     echo 1 > /sys/bus/pci/devices/0000:07:00.0/remove
>> 2. change bus range in 00:0a.0 bus
>>     setpci -s 00:0a.0 0x1c.l=0x00101000
>> 3. remove 00:0a.0
>>     echo 1 > /sys/bus/pci/devices/0000:00:0a.0/remove
>> 4. rescan pci
>>     echo 1 > /sys/bus/pci/rescan
>> 5. reset pcie link from 00:0a.0
>>     setpci -s 00:0a.0 0xc0.b=0x18
>>     sleep 1s
>>     setpci -s 00:0a.0 0xc0.b=0x08
>> 6. rescan pci bus
>>     echo 1 > /sys/bus/pci/rescan
>
> OK, I did that (with 3.16) but the reconfiguration code doesn't
> get triggered.  Here is what dmesg and lspci -tv say:

2 should be
   setpci -s 00:0a.0 0x18.l=0x00101000
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