11 Mar
2021
11 Mar
'21
10:38 p.m.
I'm not familiar with panfrost's needs and I don't work on a tiler and I know there are different issues there. But...
The primary issue is we submit vertex+compute and fragment for each batch as two disjoint jobs (with a dependency of course), reflecting the internal hardware structure as parallel job slots. That we actually require two ioctls() and a roundtrip for this is a design wart inherited from early days of the kernel driver. The downstream Mali driver handles this by allowing multiple jobs to be submitted with a single ioctl, as Boris's patch enables. In every other respect I believe our needs are similar to other renderonly drivers. (What does turnip do?)