map DMA buffer with dma engine in another device ?

[valdis.kletnieks at vt.edu]

On Wed, 07 Feb 2018 16:15:12 +0200, Ran Shalit said:

> On viewing PCI driver, I see that dma buffer are allocated even while
> the dma engine is actually in the EP device.
> Is there any sense in doing this ?

If the buffers weren't allocated by the PCI driver, where would the dma
engine in the EP device target the DMA?
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