Re: [PATCH] libata: Store bus addresses (versus -mm for testing)

[Tejun Heo <htejun@gmail.com>]

Alan Cox wrote:
> As we cannot reverse iomap results portably as we tried before the libata
> layer needs to keep bus addresses around for reporting. This first big
> patch adds a structure for it and teaches the drivers to keep the
> information. Thankfully most drivers go via libata-sff and it can do the
> work for them.
> 
> For the others we replace ata_std_ports with ata_std_io_ports /
> std_mmio_ports and pass both the mapped and some bus address info.
> 
> We don't keep all the mappings in both forms. We only need cmd, ctrl and
> status (for wait_status() reporting). We also keep a "base" for devices
> where the taskfile (cmd/ctl) mapping makes no sense.
> 
> This patch stores all the data but doesn't yet change the display side.
> I've got a couple of variants I'm playing with on the display side and
> want to get that right. In the mean time this should store all the data
> and have no side effects for anyone, so is a good first chunk for testing
> alone.
> 
> Signed-off-by: Alan Cox <alan@redhat.com>

Eeeek... I don't think this is a good idea.  I liked the getting
original address from mapped address thing.  Is it impossible to get
that working on some archs?  Or is it just not there yet?

Thanks.

-- 
tejun