[Intel-gfx] [RFC 00/15] Selectable platform support

[Chris Wilson]

Quoting Tvrtko Ursulin (2018-02-08 13:05:51)
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> For Joonas basically. :)
> 
> Rough goal - add Kconfig options to turn off supported platforms and count on
> compiler DCE to make the driver smaller.
> 
> Tested as so much that it boots and renders on Skylake with all platforms/gens
> older than Gen8 turned off.
> 
>    text    data     bss     dec     hex filename
> 1502847   54223    2888 1559958  17cd96 i915.ko.original
> 1375647   51939    2888 1430474  15d3ca i915.ko.gen8+
> 
> So only ~124kiB saving. Or ~8.5%. Perhaps once GCC LTO support lands it would be
> better than this?

Did you get to the point where the compiler was complaining about unused
functions?
 
> Starts with smaller patches to show the idea step by step on Gen2, then proceeds
> in larger chunks, to finish with some invasive Coccinelle works to enable the
> last few kilo-bytes of savings.

So, if we want to support this, how do we test it?

Do a per-platform build and check modinfo for pci ids?

Limit the CI builds to be per-platform and check they work?
-Chris