[Nouveau] gp104: regression on Linux 5.6

[Alexey Dobriyan]

On Thu, Apr 30, 2020 at 12:15:28AM -0400, Ilia Mirkin wrote:
> Hi Alexey,
> 
> On Fri, Apr 24, 2020 at 10:52 PM Alexey Dobriyan <adobriyan at gmail.com> wrote:
> >
> > gp104 refuses to switch to "graphic" mode and show anything past
> > this line:
> >
> >         fb0: switching to nouveaufb from EFI VGA
> >
> > Machine is fine, as it I can press Ctrl+Alt+Delete and reboot it
> > normally.
> >
> > 5.5 is OK. 5.6 is broken.
> 
> I've heard some issues relating to missing firmware lately. It should
> work fine without firmware, but perhaps that got broken. Can you log
> into the machine and check dmesg to see what's there? My guess is that
> nouveau takes over from efifb, and then fails to load at some point in
> the middle.

I've fixed the issue by including all firmware until "failed to load"
messages disappeared. X works and fbconsole on VT1-VT6 works too.

CONFIG_EXTRA_FIRMWARE="nvidia/gp104/gr/sw_nonctx.bin nvidia/gp104/gr/sw_ctx.bin nvidia/gp104/gr/sw_bundle_init.bin nvidia/gp104/gr/sw_method_init.bin nvidia/gp104/gr/fecs_bl.bin nvidia/gp104/gr/fecs_inst.bin nvidia/gp104/gr/fecs_data.bin nvidia/gp104/gr/fecs_sig.bin nvidia/gp104/gr/gpccs_bl.bin nvidia/gp104/gr/gpccs_inst.bin nvidia/gp104/gr/gpccs_data.bin nvidia/gp104/gr/gpccs_sig.bin nvidia/gp104/sec2/image.bin nvidia/gp104/sec2/desc.bin nvidia/gp104/sec2/sig.bin nvidia/gp104/acr/ucode_load.bin nvidia/gp104/acr/ucode_unload.bin nvidia/gp104/acr/bl.bin nvidia/gp104/acr/unload_bl.bin nvidia/gp104/nvdec/scrubber.bin"

> > Bisecting is kinda painful with miscompilation and init/main.c breakage.
> >
> > BTW do I need all those megabytes of firmware?
> >
> > [    0.923273] fb0: switching to nouveaufb from EFI VGA
> > [    0.923440] nouveau 0000:02:00.0: NVIDIA GP104 (134000a1)
> > [    1.026681] nouveau 0000:02:00.0: bios: version 86.04.1e.00.01
> > [    1.026930] nouveau 0000:02:00.0: gr: failed to load firmware "gr/sw_nonctx"
> > [    1.026934] nouveau 0000:02:00.0: gr: failed to load gr/sw_nonctx
> 
> This is necessary to provide any sort of acceleration. Otherwise this
> is just a dumb scanout engine. You only need the firmware for your
> chipset, not all of it.

OK, thanks!