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

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Message-ID: <20200527143642.5e4ffba0@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Wed, 27 May 2020 14:36:42 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Luis Chamberlain <mcgrof@...nel.org>
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Subject: Re: [PATCH v3 0/8] kernel: taint when the driver firmware crashes

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.