[RFC v2 4/8] drm/amdgpu: Serialize non TDR gpu recovery with TDRs

[Grodzovsky, Andrey]

Just a gentle ping.

Andrey
________________________________
From: Grodzovsky, Andrey
Sent: 26 January 2022 10:52
To: Christian König <ckoenig.leichtzumerken at gmail.com>; Koenig, Christian <Christian.Koenig at amd.com>; Lazar, Lijo <Lijo.Lazar at amd.com>; dri-devel at lists.freedesktop.org <dri-devel at lists.freedesktop.org>; amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>; Chen, JingWen <JingWen.Chen2 at amd.com>
Cc: Chen, Horace <Horace.Chen at amd.com>; Liu, Monk <Monk.Liu at amd.com>
Subject: Re: [RFC v2 4/8] drm/amdgpu: Serialize non TDR gpu recovery with TDRs


JingWen - could you maybe give those patches a try on SRIOV XGMI system ? If you see issues maybe you could let me connect and debug. My SRIOV XGMI system which Shayun kindly arranged for me is not loading the driver with my drm-misc-next branch even without my patches.

Andrey

On 2022-01-17 14:21, Andrey Grodzovsky wrote:


On 2022-01-17 2:17 p.m., Christian König wrote:
Am 17.01.22 um 20:14 schrieb Andrey Grodzovsky:

Ping on the question

Oh, my! That was already more than a week ago and is completely swapped out of my head again.


Andrey

On 2022-01-05 1:11 p.m., Andrey Grodzovsky wrote:
Also, what about having the reset_active or in_reset flag in the reset_domain itself?

Of hand that sounds like a good idea.


What then about the adev->reset_sem semaphore ? Should we also move this to reset_domain ?  Both of the moves have functional
implications only for XGMI case because there will be contention over accessing those single instance variables from multiple devices
while now each device has it's own copy.

Since this is a rw semaphore that should be unproblematic I think. It could just be that the cache line of the lock then plays ping/pong between the CPU cores.


What benefit the centralization into reset_domain gives - is it for example to prevent one device in a hive trying to access through MMIO another one's
VRAM (shared FB memory) while the other one goes through reset ?

I think that this is the killer argument for a centralized lock, yes.


np, i will add a patch with centralizing both flag into reset domain and resend.

Andrey


Christian.


Andrey

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