On Fri, Apr 20, 2018 at 12:44:01PM +0200, Christian König wrote:
What we need is an sg_alloc_table_from_resources(dev, resources, num_resources) which does the handling common to all drivers.
A structure that contains
{page,offset,len} + {dma_addr+dma_len}
is not a good container for storing
{virt addr, dma_addr, len}
no matter what interface you build arond it.
Why not? I mean at least for my use case we actually don't need the virtual address.
If you don't need the virtual address you need scatterlist even list.
What we need is {dma_addr+dma_len} in a consistent interface which can come from both {page,offset,len} as well as {resource, len}.
Ok.
What I actually don't need is separate handling for system memory and resources, but that would we get exactly when we don't use sg_table.
At the very lowest level they will need to be handled differently for many architectures, the questions is at what point we'll do the branching out.