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Date:	Thu, 18 Dec 2014 18:33:58 -0200
From:	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:	Prashant Sreedharan <prashant@...adcom.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Michael Chan <mchan@...adcom.com>,
	Rajat Jain <rajatxjain@...il.com>,
	Nils Holland <nholland@...ys.org>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Rafael Wysocki <rjw@...ysocki.net>
Subject: Re: [bisected] tg3 broken in 3.18.0?

On 18-12-2014 18:09, Marcelo Ricardo Leitner wrote:
> On 18-12-2014 17:28, Prashant Sreedharan wrote:
>> On Thu, 2014-12-18 at 12:15 -0700, Bjorn Helgaas wrote:
>>> On Tue, Dec 16, 2014 at 12:54 PM, Michael Chan <mchan@...adcom.com> wrote:
>>>> On Tue, 2014-12-16 at 15:59 -0200, Marcelo Ricardo Leitner wrote:
>>>>> It's a
>>>>> 02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5722
>>>>> Gigabit Ethernet PCI Express
>>>>> over here
>>>>>
>>>>> I put a WARN_ON(1) after those printks, and this is what I got:
>>>>>
>>>>> [    1.550640] pci 0000:02:00.0: 1st 1 1
>>>>> [    1.550643] pci 0000:02:00.0: crs_timeout: 0
>>>>> [    1.550645] ------------[ cut here ]------------
>>>>> [    1.550651] WARNING: CPU: 6 PID: 364 at drivers/pci/probe.c:1445 pci_bus_read_dev_vendor_id+0x1d4/0x1e0()
>>>>> [    1.550652] Modules linked in: i915(+) raid0 i2c_algo_bit drm_kms_helper drm e1000e(+) tg3(+) ptp pps_core video
>>>>> [    1.550660] CPU: 6 PID: 364 Comm: systemd-udevd Not tainted 3.18.0-rc6+ #8
>>>>> [    1.550661] Hardware name: Dell Inc. OptiPlex 9010/03K80F, BIOS A15 08/12/2013
>>>>> [    1.550662]  0000000000000000 000000004de2d8dc ffff8807eabdf948 ffffffff8173db46
>>>>> [    1.550665]  0000000000000000 0000000000000000 ffff8807eabdf988 ffffffff81094d41
>>>>> [    1.550667]  ffff8807eabdf968 ffff8807f1e27000 0000000000000000 0000000000000000
>>>>> [    1.550669] Call Trace:
>>>>> [    1.550675]  [<ffffffff8173db46>] dump_stack+0x46/0x58
>>>>> [    1.550679]  [<ffffffff81094d41>] warn_slowpath_common+0x81/0xa0
>>>>> [    1.550681]  [<ffffffff81094e5a>] warn_slowpath_null+0x1a/0x20
>>>>> [    1.550683]  [<ffffffff813b2864>] pci_bus_read_dev_vendor_id+0x1d4/0x1e0
>>>>> [    1.550687]  [<ffffffff813b7c3e>] pci_device_is_present+0x2e/0x50
>>>>> [    1.550693]  [<ffffffffa003364f>] tg3_chip_reset+0x2f/0x940 [tg3]
>>>>> [    1.550697]  [<ffffffffa0033f9f>] tg3_halt+0x3f/0x1e0 [tg3]
>>>>> [    1.550701]  [<ffffffffa0044f83>] tg3_init_one+0xb83/0x1a40 [tg3]
>>>>
>>>> So does it work if you use a non-zero crs_timeout?  The driver has
>>>> called tg3_halt() which may affect configuration read responses.  I need
>>>> to check with the hardware team to see if the 5722 will return CRS in
>>>> this scenario.
>>>
>>> Any updates from the hardware team?
>>>
>>> This is a pretty serious regression, but as far as I can tell, it is
>>> not a PCI bug.  The device should respond to a config read of vendor
>>> ID.  If the driver does something that make the read return CRS
>>> status, I think the driver is responsible for doing whatever delay or
>>> other fixup is required.
>>>
>>> I'm inclined to reassign this bug to the tg3 driver unless you think
>>> the PCI core is doing something wrong here.
>>>
>>> Bjorn
>>
>> We were not able to reproduce this issue, could you please check what is
>> the value of reg 0x70, before the pci_device_is_present call is made ?
>> if bit 15 is set config access will be retried.
>>
>> --- a/drivers/net/ethernet/broadcom/tg3.c
>> +++ b/drivers/net/ethernet/broadcom/tg3.c
>> @@ -9025,6 +9025,7 @@ static int tg3_chip_reset(struct tg3 *tp)
>>           void (*write_op)(struct tg3 *, u32, u32);
>>           int i, err;
>>
>> +       printk(KERN_ERR "config state: %x\n", tr32(TG3PCI_PCISTATE));
>>           if (!pci_device_is_present(tp->pdev))
>>                   return -ENODEV;
>>
>
> With that PCI patch applied and my debugs, without the timeout hack (so crs_timeout=0):
>
> [    1.545554] config state: 12b2
> [    1.548636] pci 0000:02:00.0: 1st 1 1
> [    1.548637] pci 0000:02:00.0: crs_timeout: 0
> [    1.548783] tg3 0000:02:00.0 eth0: Tigon3 [partno(BCM95722) rev a200] (PCI Express) MAC address 00:0a:f7:2b:9b:39
> [    1.548785] tg3 0000:02:00.0 eth0: attached PHY is 5722/5756 (10/100/1000Base-T Ethernet) (WireSpeed[1], EEE[0])
> [    1.548786] tg3 0000:02:00.0 eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
> [    1.548787] tg3 0000:02:00.0 eth0: dma_rwctrl[76180000] dma_mask[64-bit]
> [    1.554389] tg3 0000:02:00.0 p1p1: renamed from eth0
> ...
>
> That's the only time your printk got printed.

My bad, I forgot I had configured the system to not bring that iface up 
anymore.. when doing so, just like Nils had too:

[ 1743.678714] tg3 0000:02:00.0: irq 32 for MSI/MSI-X
[ 1745.554039] tg3 0000:02:00.0 p1p1: No firmware running
[ 1745.554724] config state: 12b2
[ 1745.557822] pci 0000:02:00.0: 1st 1 1
[ 1745.557827] pci 0000:02:00.0: crs_timeout: 0
[ 1745.559383] config state: 12b2
[ 1745.562470] pci 0000:02:00.0: 1st 1 1
[ 1745.562471] pci 0000:02:00.0: crs_timeout: 0

   Marcelo

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