On Thu, Dec 18, 2014 at 11:28:09AM -0800, Prashant Sreedharan wrote:
> On Thu, 2014-12-18 at 12:15 -0700, Bjorn Helgaas wrote:
> >
> > 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;
No problem, I gave this a try and here is what I get:
[ 2.185190] libphy: tg3 mdio bus: probed
[ 2.229357] tsc: Refined TSC clocksource calibration: 2399.999 MHz
[ 2.244993] config state: 1292
[ 2.247136] tg3 0000:02:00.0 eth0: Tigon3 [partno(BCM57780) rev 57780001]
(PCI Express) MAC address 00:19:99:ce:13:a6
[ 2.249279] tg3 0000:02:00.0 eth0: attached PHY driver [Broadcom BCM57780]
(mii_bus:phy_addr=200:01)
[ 2.251460] tg3 0000:02:00.0 eth0: RXcsums[1] LinkChgREG[0]
MIirq[0] ASF[0] TSOcap[1]
[ 2.253672] tg3 0000:02:00.0 eth0: dma_rwctrl[76180000] dma_mask[64-bit]
[...]
[ 12.204692] tg3 0000:02:00.0
enp2s0: No firmware running
[ 12.206653] config state: 1292
[ 12.208655] config state: 1292
That's all of the three times the new debugging line gets hit when I
boot my system using the supplied diagnostic patch.
Hope that helps - of course, I'd gladly test any further
(diagnostic) patches if required! Also, if I can provide any
additional information that might be of value, just ask:-)
Greetings,
Nils
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