[Nouveau] [Bug 111392] [NV110] bus: MMIO read of 00000000 FAULT at 619444 [ IBUS ]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111392

--- Comment #1 from Giuseppe Lumia <gius-italy at live.it> ---
I found out something new about the bug. Looks like the read on 0x619444 is
called by the function gm107_gr_init_bios_2 in
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/gpu/drm/nouveau/nvkm/engine/gr/gm107.c?h=v5.2.8#n309. 

I got nvapeek to work on my system ( I had to disable kernel_lockdown since I
was getting "PCI init failure" ) and this is the output:

    ./nvapeek 0x619444
    00619444: badf1301


The curious thing is that if I analyze all the addresses preceding and
following 0x619444 I get only a list of badf1301 and badf1100 (so a "small
error" on the offset is to exclude).

Unfortunately I have no clue what this address 0x619444 refers to and why the
function gm107_gr_init_bios_2 was added to the source code. 

I also found out the commit which added this code:
https://github.com/torvalds/linux/commit/0f78acc86bbfc60cdaffd4eb03e4a35b28397cbb

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