On Thu, Feb 21, 2019 at 5:07 PM Alyssa Rosenzweig <[email protected]> wrote:
> > Yes, there is a buffer for holding the results of the tiler. The way it > > works is that the userspace driver allocates a very large buffer with a > > "grow on page fault" bit, so the kernel will allocate more memory as the > > tiler asks for it. > > To be clear, right now I have this magic misc_0 buffer setup that way, > too (allocating something enormous and setting GROW_ON_GPF). Although, > it's not clear to me that that is the _correct_ thing to do; IIRC, the > blob allocates "just enough", no GROW_ON_GPF needed, but I should > probably check that. > I don't know about Midgard, but on Bifrost it definitely uses GROW_ON_GPF, telling the kernel to preallocate some small-ish initial set, presumably as an optimization. I don't think you can accurately predict how much memory you're going to need ahead of time, since it depends on how the triangles are distributed along the screen.
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