Re: [PATCH] drm/radeon: resume fence driver to last sync sequence on lockup

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On 14.12.2012 21:33, Jerome Glisse wrote:
On Fri, Dec 14, 2012 at 3:13 PM, Christian König
<deathsimple@xxxxxxxxxxx> wrote:
On 14.12.2012 18:39, j.glisse@xxxxxxxxx wrote:
From: Jerome Glisse <jglisse@xxxxxxxxxx>

After lockup we need to resume fence to last sync sequence and not
last received sequence so that all thread waiting on command stream
that lockedup resume. Otherwise GPU reset will be ineffective in most
cases.
NAK. I changed this on purpose to get partial resets working, please don't
change it back.

The IB test code should reset this to the last synced value anyway, if it
doesn't work then there is something wrong there.

Christian.
There is something wrong ....

What symptoms? What exactly is going wrong?

Thinking about it the sequence probably won't get reseted when we encounter a unrecoverable GPU lockup. And even when the partial GPU reset fails it might be a good idea to reset the fence sequence like this....

Ok, you're right there is something wrong. Going to write a patch for this...

Cheers,
Christian.
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