Date:	Fri, 29 Jan 2016 10:31:59 -0600
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	Мороз Олег <oleg.moroz@....vniiem.ru>
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

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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> > > 
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