linux-kernel - Re: lost interrupts when running sabrelite images (v4.15+) in qemu

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Date:   Sat, 3 Mar 2018 11:07:56 -0800
From:   Troy Kisky <troy.kisky@...ndarydevices.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Fugang Duan <fugang.duan@....com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: lost interrupts when running sabrelite images (v4.15+) in qemu

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.

BR
Troy