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

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Message-ID: <CAE9FiQUk-sAHnjfBvNeHQWibJRqbPE1V0UtDtARtwxmS=7aQrw@mail.gmail.com>
Date:	Fri, 12 Sep 2014 16:09:14 -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 3:05 PM, Dirk Gouders <dirk@...ders.net> wrote:
> Yinghai Lu <yinghai@...nel.org> writes:
>
>> On Fri, Sep 12, 2014 at 1:54 PM, Dirk Gouders <dirk@...ders.net> wrote:
>>> Yinghai Lu <yinghai@...nel.org> writes:
>>>
>>>> On Fri, Sep 12, 2014 at 1:05 PM, Dirk Gouders <dirk@...ders.net> wrote:
>>>>> Dirk Gouders <dirk@...ders.net> writes:
>>> -[0000:00]-+-01.0-[01-02]--+-0d.0-[02]--
>>>            |               +-0e.0  Broadcom BCM5785 [HT1000] SATA (PATA/IDE Mode)
>>>            |               \-0e.1  Broadcom BCM5785 [HT1000] SATA (PATA/IDE Mode)
>>>            +-02.0  Broadcom BCM5785 [HT1000] Legacy South Bridge
>>>            +-02.1  Broadcom BCM5785 [HT1000] IDE
>>>            +-02.2  Broadcom BCM5785 [HT1000] LPC
>>>            +-03.0  Broadcom BCM5785 [HT1000] USB
>>>            +-03.1  Broadcom BCM5785 [HT1000] USB
>>>            +-03.2  Broadcom BCM5785 [HT1000] USB
>>>            +-06.0-[03]--
>>>            +-07.0-[04]--+-04.0  Broadcom Corporation NetXtreme BCM5780 Gigabit Ethernet
>>>            |            \-04.1  Broadcom Corporation NetXtreme BCM5780 Gigabit Ethernet
>>>            +-0a.0-[05]--
>>>            +-0b.0-[06]--
>>
>> what is "lspci -tv" and "lspci -vvxxx" look like before your patch that cut down
>> end bus to 07 ...?
>
> Rebooted with 3.16 kernel:
>
> # lspci -tv
>
> -[0000:00]-+-01.0-[01-02]--+-0d.0-[02]--
>            |               +-0e.0  Broadcom BCM5785 [HT1000] SATA (PATA/IDE Mode)
>            |               \-0e.1  Broadcom BCM5785 [HT1000] SATA (PATA/IDE Mode)
>            +-02.0  Broadcom BCM5785 [HT1000] Legacy South Bridge
>            +-02.1  Broadcom BCM5785 [HT1000] IDE
>            +-02.2  Broadcom BCM5785 [HT1000] LPC
>            +-03.0  Broadcom BCM5785 [HT1000] USB
>            +-03.1  Broadcom BCM5785 [HT1000] USB
>            +-03.2  Broadcom BCM5785 [HT1000] USB
>            +-06.0-[03]--
>            +-07.0-[04]--+-04.0  Broadcom Corporation NetXtreme BCM5780 Gigabit Ethernet
>            |            \-04.1  Broadcom Corporation NetXtreme BCM5780 Gigabit Ethernet
>            +-08.0-[05]--
>            +-09.0-[06]--
>            +-0a.0-[07]----00.0  LSI Logic / Symbios Logic FC949ES Fibre Channel Adapter
>            +-0b.0-[08]--

where are 00:08.0 and 00:09.0 going? Did you just skip them in "cut
end bus patch" ?

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
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