[radeonsi, regression, bisected] All my Steam games fail to load into the 3D-engine-powered part (SIGPWR and SIGXCPU)

[Kai Wasserbäch]

Kai Wasserbäch wrote on 15.11.2014 22:22:
> Kai Wasserbäch wrote on 15.11.2014 16:33:
>> Is there anything besides a bisect you would need to debug this?
> 
> Ok, I did a bisection, but that time was wasted for sure. My "first bad commit"
> isn't bad at all. Is there any way to improve that experience? I'm really loathe
> to go through the dozen boots again, just to get another broken bisection.

Ok, after looking at the changes for radeon I decided to try the HEAD of
drm-next-3.19 (c81b99423bd9d3fc35ac8752ca5fb4c50eab063c). That was still good.
Armed with this much smaller bisection range, I came up with a result that
sounds at least believable:
3cd76f3901e73a4a61d78c4526dcbf6d87c9a928 is the first bad commit
commit 3cd76f3901e73a4a61d78c4526dcbf6d87c9a928
Author: Christian König <christian.koenig at amd.com>
Date:   Mon Oct 13 12:41:47 2014 +0200

    drm/radeon: update the VM after setting BO address (v2)

    This way the necessary VM update is kicked off immediately
    if all BOs involved are in GPU accessible memory.

    v2: fix vm lock handling

    Signed-off-by: Christian König <christian.koenig at amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

:040000 040000 5bb1cc4497cc2e5b9af3a59170d7a8d5c99fd0a0
3df4996bc1a25f9275b833c778cdc33a30b28838 M      drivers

CCing Christian, maybe he has an idea, what's up.

Let me know, if you need something else, to debug this or if I should file this
as a bug.


> I noticed, however, that the following line is showing up with be762d181e in dmesg:
> [drm:ci_dpm_init [radeon]] *ERROR* Invalid PCC GPIO!== power state 0 ==

This seems to be unrelated as it shows up with all the commits from the 3.19
branch, I've tested for this bisection run, even those, that worked. (Might this
be, however, related to <https://bugs.freedesktop.org/show_bug.cgi?id=82201>?)

Cheers,
Kai

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