dma_alloc_coherent

[bob jonny]

In dma_alloc_coherent(), where is it allocating memory from, and how does it know that that memory is cache coherent? Does every device have it's cache coherent memory? I got lost at function pointer struct dma_map_ops ops, is there an easy way to figure out what ops->alloc_coherent() points to?
 		 	   		  
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