CODEWITHSUNDEEP
celldmaspu
Paul Wicks
Paul Wicks

Reputation: 65550

Direct SPU to SPU DMA requests on the Cell Processor?

Normal DMA requests on the Cell happen between the SPUs and the PPU. However, I have read that it is possible to set up DMA directly between SPUs. Anyone have any idea how this is accomplished?

Upvotes: 1

Views: 527

Answers (2)

Stack Overflow is garbage
Stack Overflow is garbage

Reputation: 248029

The trick is essentially what Chris said. The local store of one SPE is memory-mapped into the PPE's memory space. And then you just perform a regular DMA transfer from the other SPE to that address on the PPE.

I'm sorry I don't have the exact code for this. It's been a year or so since I had to do any of this. :)

Upvotes: 0

Chris
Chris

Reputation:

Have a look at spe_get_ls(). This will help you to setup a list of effective addresses that you can use to transfer data between local stores. You may need some management to map spe identifiers to physical SPUs.

Upvotes: 2

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