Jason Gunthorpe baa6d39663
fpga: Add scatterlist based programming ...
Requiring contiguous kernel memory is not a good idea, this is a limited
resource and allocation can fail under normal work loads.
This introduces a .write_sg op that supporting drivers can provide
to DMA directly from dis-contiguous memory and a new entry point
fpga_mgr_buf_load_sg that users can call to directly provide page
lists.
The full matrix of compatibility is provided, either the linear or sg
interface can be used by the user with a driver supporting either
interface.
A notable change for drivers is that the .write op can now be called
multiple times.
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com >
Acked-by: Alan Tull <atull@opensource.altera.com >
Acked-by: Moritz Fischer <moritz.fischer@ettus.com >
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
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