Messages in this thread | | | Subject | Re: lost interrupts when running sabrelite images (v4.15+) in qemu | From | Guenter Roeck <> | Date | Sat, 3 Mar 2018 13:12:23 -0800 |
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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
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