On 03/05/2018 09:30 AM, Troy Kisky wrote:
On 3/3/2018 1:12 PM, Guenter Roeck wrote:
On 03/03/2018 12:48 PM, Guenter Roeck wrote:
On 03/03/2018 11:07 AM, Troy Kisky wrote:
On 3/3/2018 8:32 AM, Guenter Roeck wrote:
Hi,
since v4.15, I get the following runtime warning when running sabrelite images
in qemu.
irq 65: nobody cared (try booting with the "irqpoll" option)
...
handlers:
[<26292474>] fec_pps_interrupt
Disabling IRQ #65
fec 2188000.ethernet (unnamed net_device) (uninitialized): MDIO read timeout
Bisect points to commit 4ad1ceec05e491 ("net: fec: Let fec_ptp have its
own interrupt routine"). Analysis shows that platform_irq_count()
returns 2, which is reduced to 1 by fec_enet_get_irq_cnt().
If I let fec_enet_get_irq_cnt() return 2, the problem is gone.
Reverting commit 4ad1ceec05e491 also fixes the problem.
Bisect log is attached.
Sounds like you found a bug with qemu. I just booted sabrelite over nfs fine.
My interrupts look like this.
64: 98767 0 0 0 GIC-0 150 Level
2188000.ethernet
65: 0 0 0 0 GIC-0 151 Level
2188000.ethernet
___________
Irq 65 is only for ptp interrrupts now. If qemu is signaling an tx/rx frame
interrupt on 65,
then qemu is wrong. Of course, I've never used qemu so feel free to ignore me
if I make no sense.
Thanks for checking with real hardware.
This is what I see (with your patch reverted):
64: 0 GIC-0 150 Level 2188000.ethernet
65: 64 GIC-0 151 Level 2188000.ethernet
Looking into the qemu source, I see:
#define FSL_IMX6_ENET_MAC_1588_IRQ 118
#define FSL_IMX6_ENET_MAC_IRQ 119
FSL_IMX6_ENET_MAC_IRQ is then connected to fec interrupt index 0, and
FSL_IMX6_ENET_MAC_1588_IRQ
is connected to fec interrupt index 1.
This may suggest that the defines are reversed. I'll see what happens if I swap
them.
Confirmed. If I swap the above defines, everything works fine. At the same time,
the modified qemu works with older kernels.
Thanks a lot for the hint, and sorry for the noise.
Guenter
It definitely was not noise. I bet it helps people searching the mailing list
in the future.
Thanks for posting the resolution.
Turns out "works" as I stated above is not entirely accurate.
- v4.13 and later work
- In v4.12 and earlier, the Ethernet interface fails to instantiate with
fec 2188000.ethernet (unnamed net_device) (uninitialized): MDIO read
timeout
fec: probe of 2188000.ethernet failed with error -5
I have not found the reason yet. Unmodified qemu works fine.
- v4.1 and earlier crash. The crash is fixed by commit 32cba57ba74be ("net: fec:
introduce fec_ptp_stop and use in probe fail path")
There is also a matching bug at lauchpad:
https://bugs.launchpad.net/qemu/+bug/1753309
Guenter
