On Mon, Dec 09, 2013 at 05:20:22PM +0000, Arnd Bergmann wrote:

On Monday 09 December 2013, Catalin Marinas wrote:

quoted

CONFIG_PCI does not exist on arm64 yet (we have some internal patches
but may not be ready to be posted before the holidays; they try to share
code with other archs, so more discussions before merging). We could add
CONFIG_PCI and some dummy functions on arm64 for development (not to be
upstreamed) or Hanjun could continue to use the current patch before we
get PCI working. In the order of priorities, we'll have to merge PCI
before ACPI anyway.

Well, lack of PCI support on ARM64 is a much better reason for accepting
the patch than potential use on non-server platforms of course.

As I said above about priorities, we are not in a hurry to merge ACPI
for arm64 before PCI is supported.

What is the status of the PCI work though? I suspect it won't be all
that hard to add minimal PCI support for a simple mmconfig plus
fixed I/O space based host of the kind that qemu can easily provide.

Liviu (ARM engineer) has been working on generalising the microblaze
code (which is very similar to powerpc) and enable it on arm64. The
patches will be posted soon (though may slip into the new year) but
there will be many discussions on how to do this best, so I don't expect
a quick merge.

In parallel, Will is looking at getting PCI to work with kvmtool and
that's something we could merge sooner (but again, in the new year).

The hard part that we want to share code with other architectures is
supporting pluggable host controllers, and I think we can defer that
a bit.

Indeed, this would take time.

-- 
Catalin