[Nouveau] Questions on syncing mechanisms

[Fernando Sahmkow]

So I have been implementing syncing mechanisms to yuzu's switch emulator,
aka Tegra X1 emulation and I already have: Semaphores, Syncpoints and
Queries to some extent. I'm missing the barriers (GPU waits for CPU):
I got this from RE:
Barrier mode has priority (from highest to lowest): 1) 0x08 sets needsWfi=0
-> highest priority, does puller refcnt + split(0,0) + 0x100 NoOperation +
rest of cmds + split(1,1) 2) 0x01 sets needsWfi=0 -> uses 0x0110
Serialize/"WaitForIdle" 3) 0x02 sets needsWfi=1 -> uses 0xDE0 (??) 4) 0x04
sets needsWfi=1 -> uses 0xF7C (??) <-- tile related? Used by
nvnQueue_ctrlTiledDownsample 5) nothing; sets needsWfi=0
 Do you guys know any info on this and how the GPU must behave in each
situation. For instance, on Serialize, what should the GPU be waiting for?
I do know you guys use that one not sure on the rest.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/nouveau/attachments/20190609/7ffb63c1/attachment.html>