Messages in this thread | | | Date | Fri, 9 Dec 2011 14:24:05 +0000 | From | Alan Cox <> | Subject | Re: [Linaro-mm-sig] [RFC v2 1/2] dma-buf: Introduce dma buffer sharing mechanism |
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> I still don't think that's possible. Please explain how you expect > to change the semantics of the streaming mapping API to allow multiple > mappers without having explicit serialization points that are visible > to all users. For simplicity, let's assume a cache coherent system
I would agree. It's not just about barriers but in many cases where you have multiple mappings by hardware devices the actual hardware interface is specific to the devices. Just take a look at the fencing in TTM and the graphics drivers.
Its not something the low level API can deal with, it requires high level knowledge.
Alan
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