[Nouveau] [PATCH 4/5] gr/gf100: wait on bottom half of FE's pipeline

[Alexandre Courbot]

On Wed, Jun 10, 2015 at 2:28 PM, Ben Skeggs <skeggsb at gmail.com> wrote:
> On 10 June 2015 at 15:25, Alexandre Courbot <gnurou at gmail.com> wrote:
>> On Mon, Jun 8, 2015 at 10:43 PM, Alexandre Courbot <gnurou at gmail.com> wrote:
>>> On Mon, Jun 8, 2015 at 8:04 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
>>>> A naive question from someone who knows nothing of icmd or bundles... Would
>>>> it be better to wait for both bits to become 0 (I.e. 0x6)?
>>>
>>> My understanding is that a method reaching the bottom half implies it
>>> has passed to upper half (whatever these halfs are, I need to dig into
>>> the doc to completely figure it out), and thus that while waiting for
>>> both bits would do no harm, it would not do any good either.
>>>
>>> Waiting on the bottom half is what downstream does, so I think this
>>> behavior is safe to apply to Nouveau.
>>
>> After checking, this seems to be correct. Upper half of the front-end
>> method pipeline corresponds to the decode stage, bottom half to
>> validate and emit. So we need to wait on the bottom half to be sure
>> methods are emitted.
> These docs should totally make it to download.nvidia.com/open-gpu/doc ;)

If only that just depended on me! ;)