Date:	Tue, 2 Feb 2016 19:17:02 +0300
From:	Олег Мороз <oleg.moroz@....vniiem.ru>
To:	Bjorn Helgaas <helgaas@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	linux-pci@...r.kernel.org
Subject: Re: PCI device driver broken between 4.2 and 4.3

Ohhh. It's not my driver from scratch. I'm just trying to maintain it in 
working state.
Could you please advice me some correct and small and simple (I know I 
ask a lot) PCI driver as example. Maybe it will be not so hard to fix 
this 1553b driver.

02.02.2016 19:13, Bjorn Helgaas пишет:
> On Tue, Feb 02, 2016 at 08:04:39AM +0300, Олег Мороз wrote:
>> it looks much better with pci=routeirq
>>
>> [  100.896723] *Before pci_enable_device IRQ 20*
>> [  100.896735] *After pci_enable_device IRQ 20*
>> [  100.896745] *Before pci_enable_device IRQ 21*
>> [  100.896752] *After pci_enable_device IRQ 21*
> If pci=routeirq makes a difference, it usually means your driver is
> looking at dev->irq before it calls pci_enable_device().  I looked at
> what I think is your driver
> (https://github.com/qmor/elcus-1553-driver-linux/blob/master/driver/tmk1553.c),
> but I didn't *see* that problem.  It does use a highly unconventional
> strategy of calling pci_get_device() to locate devices, instead of
> using pci_register_driver() like normal drivers do.
>
> You should not have to use pci=routeirq, and I've even considered
> removing the option.
>
>> On Monday 01 of February 2016 15:08:23 Bjorn Helgaas wrote:
>>> [+cc Yinghai]
>>>
>>> On Mon, Feb 01, 2016 at 08:18:35AM +0300, Олег Мороз wrote:
>>>> Okay. I've started from driver level printk
>>>> results are:
>>>>
>>>> On 4.2
>>>>
>>>> [414006.575989] Before pci_enable_device IRQ 20
>>>>
>>>> [414006.575991] After pci_enable_device IRQ 20
>>>>
>>>> [414006.575997] Before pci_enable_device IRQ 21
>>>>
>>>> [414006.575999] After pci_enable_device IRQ 21
>>>>
>>>> on 4.3
>>>>
>>>> [  114.862289] Before pci_enable_device IRQ 5
>>>>
>>>> [  114.862303] After pci_enable_device IRQ 5
>>>>
>>>> [  114.862316] Before pci_enable_device IRQ 5
>>>>
>>>> [  114.862326] After pci_enable_device IRQ 5
>>>>
>>>> I've got two cards, because of that pci_enable_device() calls twice.
>>> Did you try booting with pci=routeirq as Yinghai suggested?  That's
>>> not a fix, but if it does make things work, it may give us an idea for
>>> how to fix it correctly.
>>>
>>>> On Friday 29 of January 2016 10:31:59 Bjorn Helgaas wrote:
>>>>> On Thu, Jan 28, 2016 at 10:28:14PM +0300, Мороз Олег wrote:
>>>>>> What i need to print out at first order?
>>>>> Jiang, can you chime in here?
>>>>>
>>>>> 991de2e59090 is related to IRQs, so I'd start by printing dev->irq in
>>>>> your
>>>>> driver before and after you call pci_enable_device().  Add some printks
>>>>> in
>>>>> pcibios_alloc_irq() and pcibios_enable_device() just to confirm that we
>>>>> got
>>>>>
>>>>> there and when, e.g., add lines like this:
>>>>>    dev_info(&dev->dev, "%s\n", __func__);
>>>>>
>>>>> Bjorn
>>>>>
>>>>>> 27 янв. 2016 г. 16:22 пользователь Bjorn Helgaas <helgaas@...nel.org>
>>>> написал:
>>>>>>> On Wed, Jan 27, 2016 at 12:38:06PM +0300, Мороз Олег wrote:
>>>>>>>> Also, my drive has no
>>>>>>>>
>>>>>>>> pcibios_enable_device()
>>>>>>>> pcibios_alloc_irq()
>>>>>>>>
>>>>>>>> calls.
>>>>>>> Those are internal interfaces used by the PCI core.  Drivers
>>>>>>> shouldn't
>>>>>>> call them directly.  Drivers normally call pci_enable_device(), and
>>>>>>> those internal interfaces are used in that path.
>>>>>>>
>>>>>>>> 26.01.2016 22:05, Олег Мороз пишет:
>>>>>>>>> I confirmed it works in
>>>>>>>>>
>>>>>>>>> 890e4847587f
>>>>>>>>>
>>>>>>>>> and do not works in
>>>>>>>>>
>>>>>>>>> 991de2e59090
>>>>>>>>>
>>>>>>>>> 26.01.2016 18:32, Bjorn Helgaas пишет:
>>>>>>>>>> [+cc Jiang]
>>>>>>>>>>
>>>>>>>>>> On Mon, Jan 25, 2016 at 03:52:51PM -0600, Bjorn Helgaas wrote:
>>>>>>>>>>> Hi Олег,
>>>>>>>>>>>
>>>>>>>>>>> On Sun, Jan 24, 2016 at 04:50:08PM +0300, Олег Мороз wrote:
>>>>>>>>>>>> Okay. I've sent logs (dmesg and lspci) from both 4.2 and 4.3
>>>>>>>>>>>> to bugzilla
>>>>>>>>>>> I don't see anything wrong in either log.  Both v4.2 and v4.3
>>>>>>>>>>> enumerate the device the same way, and the driver seems to
>>>>>>>>>>> claim it
>>>>>>>>>>>
>>>>>>>>>>> the same way:
>>>>>>>>>>>    pci 0000:0d:00.0: [10b5:9030] type 00 class 0x078000
>>>>>>>>>>>    pci 0000:0d:00.0: reg 0x14: [io  0x2100-0x217f]
>>>>>>>>>>>    pci 0000:0d:00.0: reg 0x18: [io  0x2380-0x239f]
>>>>>>>>>>>    pci 0000:0d:00.0: PME# supported from D0 D3hot
>>>>>>>>>>>    pci 0000:0d:01.0: [10b5:9030] type 00 class 0x078000
>>>>>>>>>>>    pci 0000:0d:01.0: reg 0x14: [io  0x2180-0x21ff]
>>>>>>>>>>>    pci 0000:0d:01.0: reg 0x18: [io  0x23a0-0x23bf]
>>>>>>>>>>>    pci 0000:0d:01.0: PME# supported from D0 D3hot
>>>>>>>>>>>    pci 0000:0d:02.0: [10b5:9030] type 00 class 0x078000
>>>>>>>>>>>    pci 0000:0d:02.0: reg 0x14: [io  0x2200-0x227f]
>>>>>>>>>>>    pci 0000:0d:02.0: reg 0x18: [io  0x2280-0x22ff]
>>>>>>>>>>>    pci 0000:0d:02.0: reg 0x1c: [io  0x2300-0x237f]
>>>>>>>>>>>    pci 0000:0d:02.0: PME# supported from D0 D3hot
>>>>>>>>>>>    
>>>>>>>>>>>    sja1000_plx_pci 0000:0d:02.0: Detected "Eclus CAN-200-PCI"
>>>>>>>>>>>
>>>>>>>>>>> card at slot #2
>>>>>>>>>>>
>>>>>>>>>>>    sja1000_plx_pci 0000:0d:02.0: Channel #1 at
>>>>>>>>>>>
>>>>>>>>>>> 0x0000000000012280, irq 22 registered as can0
>>>>>>>>>>>
>>>>>>>>>>>    sja1000_plx_pci 0000:0d:02.0: Channel #2 at
>>>>>>>>>>>
>>>>>>>>>>> 0x0000000000012300, irq 22 registered as can1
>>>>>>>>>>>
>>>>>>>>>>>    sja1000_plx_pci 0000:0d:02.0 can0: setting BTR0=0x03
>>>>>>>>>>>    BTR1=0x37
>>>>>>>>>>>
>>>>>>>>>>> One option is always to bisect between v4.2 and v4.3 to see
>>>>>>>>>>> which
>>>>>>>>>>> commit made it stop working.  See
>>>>>>>>>>> https://git-scm.com/docs/git-bisect
>>>>>>>>>> Jiang, Олег bisected this to 991de2e59090 ("PCI, x86: Implement
>>>>>>>>>> pcibios_alloc_irq() and pcibios_free_irq()").
>>>>>>>>>>
>>>>>>>>>> Олег, please double-check and confirm that 890e4847587f works
>>>>>>>>>> and
>>>>>>>>>> 991de2e59090 fails.
>>>>>>>>>>
>>>>>>>>>> Then please add some printks in the pcibios_enable_device() and
>>>>>>>>>> pcibios_alloc_irq() paths and in your driver to see exactly what
>>>>>>>>>> changed
>>>>>>>>>> between 890e4847587f and 991de2e59090
>>>>>>>>>>
>>>>>>>>>> Bjorn
>>>>>>>>>>
>>>>>>>>>>>> 23.01.2016 17:54, Bjorn Helgaas пишет:
>>>>>>>>>>>>> [+cc linux-kernel]
>>>>>>>>>>>>>
>>>>>>>>>>>>> Hi Олег,
>>>>>>>>>>>>>
>>>>>>>>>>>>> On Sat, Jan 23, 2016 at 1:08 AM, Олег Мороз
>>>>>>>>>>>>>
>>>>>>>>>>>>> <oleg.moroz@....vniiem.ru> wrote:
>>>>>>>>>>>>>> Hello. I've got a device driver for MIL-1553b card
>>>>>>>>>>>>>> called TA1-PCI, which
>>>>>>>>>>>>>> could be found at
>>>>>>>>>>>>>> https://github.com/qmor/elcus-1553-driver-linux
>>>>>>>>>>>>>> Card is using PLX_PCI9030 PCI controller.
>>>>>>>>>>>>>> Today i've found that this driver compiles, installes,
>>>>>>>>>>>>>> but is not working as
>>>>>>>>>>>>>> it should.
>>>>>>>>>>>>>> Looks like it not receives any interrupts from PCI. I've
>>>>>>>>>>>>>> test it again with
>>>>>>>>>>>>>> kernel
>>>>>>>>>>>>>> 4.2 and it works okay. What changes was made in PCI
>>>>>>>>>>>>>> subsystem from 4.2 to
>>>>>>>>>>>>>> 4.3
>>>>>>>>>>>>>> which could have impact this driver work.
>>>>>>>>>>>>> Thank you very much for this problem report.  There were many
>>>>>>>>>>>>> PCI
>>>>>>>>>>>>> changes between v4.2 and v4.3, and without more information,
>>>>>>>>>>>>> I
>>>>>>>>>>>>> can't
>>>>>>>>>>>>> guess what might be causing this problem.
>>>>>>>>>>>>>
>>>>>>>>>>>>> I opened a bug report at
>>>>>>>>>>>>> https://bugzilla.kernel.org/show_bug.cgi?id=111211
>>>>>>>>>>>>>
>>>>>>>>>>>>> Please attach complete dmesg logs for both v4.2 and v4.3 to
>>>>>>>>>>>>> that
>>>>>>>>>>>>> bug
>>>>>>>>>>>>> report.  Also, please attach the complete "lspci -vv" output
>>>>>>>>>>>>> (as
>>>>>>>>>>>>> root).
>>>>>>>>>>>>>
>>>>>>>>>>>>> Thanks!
>>>>>>>>>>>>>
>>>>>>>>>>>>> Bjorn
>>>> --
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>> -- 
>> С уважением,
>> Олег Мороз
>> Заместитель начальника отдела разработки ПО БВС КА
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
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