Re: [igt-dev] [PATCH i-g-t] lib/intel_device_info: Add IS_DGFX() support

["Dixit, Ashutosh" <ashutosh.dixit@intel.com>]

On Sun, 24 Apr 2022 22:24:06 -0700, Gupta, Anshuman wrote:
>
> > -----Original Message-----
> > From: Dixit, Ashutosh <ashutosh.dixit@intel.com>
> > Sent: Friday, April 22, 2022 9:38 PM
> > To: Gupta, Anshuman <anshuman.gupta@intel.com>
> > Cc: igt-dev@lists.freedesktop.org; Vivi, Rodrigo <rodrigo.vivi@intel.com>
> > Subject: Re: [igt-dev] [PATCH i-g-t] lib/intel_device_info: Add IS_DGFX() support
> >
> > On Fri, 22 Apr 2022 05:59:12 -0700, Anshuman Gupta wrote:
> > >
> > > Currently IGT is lacking IS_DGFX() macro support.
> > > There are some power features like D3Cold are only supported on
> > > discrete card. So IGT test/tools specific to D3Cold requires to
> > > consume IS_DGFX().
> > > Adding a is_dgfx field in intel_device_info and initializing it for
> > > DG1. All future discrete platform would require to initialize this
> > > field.
> >
> > #define IS_DGFX(fd) gem_has_lmem(fd) ?
> >
> > gem_has_lmem() is already pretty widely used so maybe we should not
> > introduce another way to achieve the same goal?
>
> Before introducing this , I thought on using gem_has_lmem.
> But I was not sure in case every discrete platform mandatory to have lmem region.
> If it is guaranteed that every discrete platform will have lmem memory region ?
> I will  drop  this patch.

So not sure what will happen in the future but till now and in the
forseeable future all dGfx platforms have LMEM, so gem_has_lmem seems fine.

I think if we introduce IS_DGFX() as in this patch, we should have an
additional patch to convert all tests using gem_has_lmem() to IS_DGFX() so
that we don't have multiple ways of tests deciding if something should run
for dGfx.

Or maybe both are also ok? So lmem related tests should use gem_has_lmem()
and non LMEM related tests should use IS_DGFX()?

So if we want to merge this let's look at other tests which are presently
using gem_has_lmem() and see if any need to be converted over to
IS_DGFX(). Or to keep things simple just use gem_has_lmem() for now?

Thanks.