[PATCH v12] drm/amdgpu: add drm buddy support to amdgpu

[Christian König]

Am 29.05.22 um 01:52 schrieb Mike Lothian:
> On Sat, 28 May 2022 at 08:44, Paneer Selvam, Arunpravin
> <Arunpravin.PaneerSelvam at amd.com> wrote:
>> [Public]
>>
>> Hi,
>>
>> After investigating quite some time on this issue, found freeze problem is not with the amdgpu part of buddy allocator patch as the patch doesn’t throw any issues when applied separately on top of the stable base of drm-next. After digging more into this issue, the below patch seems to be the cause of this problem,
>>
>> drm/ttm: rework bulk move handling v5
>> https://cgit.freedesktop.org/drm/drm/commit/?id=fee2ede155423b0f7a559050a39750b98fe9db69
>>
>> when this patch applied on top of the stable (working version) of drm-next without buddy allocator patch, we can see multiple issues listed below, each thrown randomly at every GravityMark run, 1. general protection fault at ttm_lru_bulk_move_tail() 2. NULL pointer deference at ttm_lru_bulk_move_tail() 3. NULL pointer deference at ttm_resource_init().
>>
>> Regards,
>> Arun.
> Thanks for tracking it down, fee2ede155423b0f7a559050a39750b98fe9db69
> isn't trivial to revert
>
> Hopefully Christian can figure it out

Arun is unfortunately running into the wrong direction with his testing. 
The merge fallout from "drm/ttm: rework bulk move handling v5" is 
already fixed by "drm/amdgpu: fix drm-next merge fallout", but your 
problem with the buddy allocator is separate to that.

Regards,
Christian.