linux-kernel - Re: [PATCH 09/19] drm/radeon: handle lockup in delayed work, v2

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Date:	Mon, 04 Aug 2014 16:40:24 +0200
From:	Maarten Lankhorst <maarten.lankhorst@...onical.com>
To:	Christian König <christian.koenig@....com>,
	airlied@...ux.ie
CC:	thellstrom@...are.com, nouveau@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	bskeggs@...hat.com, alexander.deucher@....com
Subject: Re: [PATCH 09/19] drm/radeon: handle lockup in delayed work, v2

op 04-08-14 16:37, Christian König schreef:
>> It'a pain to deal with gpu reset.
>
> Yeah, well that's nothing new.
>
>> I've now tried other solutions but that would mean reverting to the old style during gpu lockup recovery, and only running the delayed work when !lockup.
>> But this meant that the timeout was useless to add. I think the cleanest is keeping the v2 patch, because potentially any waiting code can be called during lockup recovery.
>
> The lockup code itself should never call any waiting code and V2 doesn't seem to handle a couple of cases correctly either.
>
> How about moving the fence waiting out of the reset code?
What cases did I miss then?

I'm curious how you want to move the fence waiting out of reset, when there are so many places that could potentially wait, like radeon_ib_get can call radeon_sa_bo_new which can do a wait, or radeon_ring_alloc that can wait on radeon_fence_wait_next, etc.
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