Add support for privileged mappings
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Cover letter [PATCH 0/3] Add support for privileged mappings
Quoted 9 lines · Jordan Crouse
Quoted 5 lines
Whilst this series is a step in the right direction for fixing that, I don't think you can claim that only low-level users need this, given that we have in-tree code which would break without it. Perhaps you just need to extend things slightly more to expose this to the DMA API as well (or, alternatively, hack the PL330 driver some how).
I agree that hacking the DMA api would be the best long term solution but there be dragons there. Perhaps a workable compromise might be to white-list privileged aware devices via the device tree.
I'm sending a v2 with an attempt at plumbing this through the DMA layer. Hopefully avoiding dragons while I'm at it :)
-Mitch
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