[Intel-gfx] [RFC PATCH i-g-t] tests/prime_vgem: Skip MMAP_GTT based subtests if no mappable GGTT

[Janusz Krzysztofik]

Hi Chris,

On Tuesday, November 26, 2019 3:34:13 PM CET Chris Wilson wrote:
> Quoting Janusz Krzysztofik (2019-11-26 14:25:48)
> > As we've agreed that using GEM_MMAP* IOCTLs on dma-buf objects without
> > a CPU accessible GART is very questionable, we are probably not going
> > to extend our MMAP_OFFSET handler with an extra processing path
> > required for it to work correctly on dma-buf objects.  As a
> > consequence, on future hardware with no mappable aperture we won't be
> > able to use MMAP_OFFSET as a replacement of MMAP_GTT in tests which
> > examine PRIME import interface.  When running on that kind of hardware,
> > just skip subtests which depend on gem_mmap__gtt().
> > 
> > Cc: Daniel Vetter <daniel at ffwll.ch>
> > Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> > ---
> >  tests/prime_vgem.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/tests/prime_vgem.c b/tests/prime_vgem.c
> > index 04cc913d..b92cf4f7 100644
> > --- a/tests/prime_vgem.c
> > +++ b/tests/prime_vgem.c
> > @@ -126,6 +126,8 @@ static void test_fence_mmap(int i915, int vgem)
> >         int dmabuf, i;
> >         int master[2], slave[2];
> >  
> > +       gem_require_mappable_ggtt(i915);
> > +
> >         igt_assert(pipe(master) == 0);
> >         igt_assert(pipe(slave) == 0);
> >  
> > @@ -210,6 +212,8 @@ static void test_gtt(int vgem, int i915)
> >         uint32_t *ptr;
> >         int dmabuf, i;
> >  
> > +       gem_require_mappable_ggtt(i915);
> > +
> >         scratch.width = 1024;
> >         scratch.height = 1024;
> >         scratch.bpp = 32;
> > @@ -285,6 +289,7 @@ static void test_gtt_interleaved(int vgem, int i915)
> >         uint32_t *ptr, *gtt;
> >         int dmabuf, i;
> >  
> > +       gem_require_mappable_ggtt(i915);
> >         igt_require(is_coherent(i915));
> 
> Ok, but these (fence_mmap, gtt_interleaved) want WC coherency as an alternative.
> test_gtt probably wants a basic test_wc alternative.

OK, I'll try to add these alternatives.

Thanks,
Janusz

> -Chris
>