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

[Ben Skeggs]

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 ;)

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