drm/amdgpu: invalidate L2 before SDMA IBs (on gfx10)

[Christian König]

Thought so, we should try to get this get it committed ASAP. And maybe 
add a CC: stable tag as well.

Patch is Reviewed-by: Christian König <christian.koenig at amd.com>.

Thanks,
Christian.

Am 26.04.20 um 02:28 schrieb Marek Olšák:
> Not without a mandatory firmware update. The gcr packet support for 
> IBs was added into the sdma firmware just two weeks ago.
>
> Marek
>
> On Sat., Apr. 25, 2020, 11:04 Christian König, 
> <ckoenig.leichtzumerken at gmail.com 
> <mailto:ckoenig.leichtzumerken at gmail.com>> wrote:
>
>     Could we do this in userspace as well?
>
>     Am 25.04.20 um 10:52 schrieb Marek Olšák:
>>     This should fix SDMA hangs on gfx10.
>>
>>     Marek
>>
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