Re: [PATCH v3 0/8] kernel: taint when the driver firmware crashes

From: Jakub Kicinski
Date: Wed May 27 2020 - 17:36:49 EST

On Wed, 27 May 2020 03:19:18 +0000 Luis Chamberlain wrote:
> I read your patch, and granted, I will accept I was under the incorrect
> assumption that this can only be used by networking devices, however it
> the devlink approach achieves getting userspace the ability with
> iproute2 devlink util to query a device health, on to which we can peg
> firmware health. But *this* patch series is not about health status and
> letting users query it, its about a *critical* situation which has come up
> with firmware requiring me to reboot my system, and the lack of *any*
> infrastructure in the kernel today to inform userspace about it.
> So say we use netlink to report a critical health situation, how are we
> informing userspace with your patch series about requring a reboot?

One of main features of netlink is pub/sub model of notifications.

Whatever you imagine listening to your uevent can listen to
devlink-health notifications via devlink.

In fact I've shown this off in the RFC patches I sent to you, see
the devlink mon health command being used.