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In the current API, precomp implicitly assumes full barriers both before & after every dispatch. That's not good for performance. However, dropping the barriers and requiring user to explicitly call barrier functions before/after would have bad ergonomics. So, we add a new parameter to the standard MESA_DISPATCH_PRECOMP signature representing the barriers required around the dispatch. As usual, the actual type & semantic is left to drivers to define what makes sense for their hardware. We just reserve the place for it. (I think most drivers will want bitflags here, but I don't think the actual flags are worth. If a driver wanted to use a struct here, that would work too.) Since the asahi stack doesn't do anything clever with barriers yet, we mechnically add an AGX_BARRIER_ALL barrier to all precomp users in-tree. We can optimize that later, this just gets the flag-day change in with no functional change. For JM panfrost, this will provide a convenient place to stash both their "job barrier" bit and their "suppress prefetch" bit (which is really a sort of barrier / cache flush, if you think about it). Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32980> |
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