linux-kernel - Re: [Nouveau] 4.16-rc1: UBSAN warning in nouveau/nvkm/subdev/therm/base.c + oops in nvkm_therm_clkgate

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Date:   Wed, 14 Feb 2018 18:41:26 +0100
From:   Pierre Moreau <pmoreau@...reau.org>
To:     Ilia Mirkin <imirkin@...m.mit.edu>
Cc:     Lyude Paul <lyude@...hat.com>, Meelis Roos <mroos@...ux.ee>,
        nouveau <nouveau@...ts.freedesktop.org>,
        Ben Skeggs <bskeggs@...hat.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [Nouveau] 4.16-rc1: UBSAN warning in
 nouveau/nvkm/subdev/therm/base.c + oops in nvkm_therm_clkgate_fini

On 2018-02-14 — 09:36, Ilia Mirkin wrote:
> On Wed, Feb 14, 2018 at 9:35 AM, Ilia Mirkin <imirkin@...m.mit.edu> wrote:
> > On Wed, Feb 14, 2018 at 9:29 AM, Meelis Roos <mroos@...ux.ee> wrote:
> >>> This is 4.16-rc1+todays git on a lowly P4 with NV5, worked fine in 4.15:
> >>
> >> NV5 in another PC (secondary card in x86-64) made the systrem crash on
> >> boot, in nvkm_therm_clkgate_fini.
> >
> > Mind booting with nouveau.debug=trace? That should hopefully tell us
> > more exactly which thing is dying. If you have a cross-compile/distcc
> > setup handy, a bisect may be even more useful.
> 
> Erm, sorry, nevermind. You even said it -- nvkm_therm_clkgate_fini is
> somehow mis-hooked up for NV5 now. A bisect result would still make
> the culprit a lot more obvious.

CC’ing Lyude Paul as she hooked up the clockgating support.

Looking at the code, only NV40+ do have a therm engine. Therefore, shouldn’t
nvkm_therm_clkgate_enable(), nvkm_therm_clkgate_fini() and
nvkm_therm_clkgate_oneinit() all check for therm being not NULL, on top of
their check for the clkgate_* hooks being there? Or instead, maybe have the
check in nvkm_device_init() nvkm_device_init()?

Pierre

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