Re: [igt-dev] [PATCH igt] igt/gem_softpin: Only expect EINVAL for color-overlaps for user objects

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Mon, Feb 26, 2018 at 08:54:47PM +0000, Chris Wilson wrote:
> Quoting Chris Wilson (2018-02-24 18:54:04)
> > If the specified object can not fit into the GTT due to overlap with a
> > neighbouring pinned object (not part of the execobjects[]), we expect to
> > fail with ENOSPC (as we cannot evict, rather than EINVAL for the user
> > error in a badly constructed execobjects[]). To prevent the tests
> > causing overlap with other external objects expand the test hole by a
> > page on either side.
> > 
> > (Setting up the system to deliberately hit ENOSPC is trickier as for
> > example it requires pinned an object into the scanout with enough free
> > space on either side to test.)
> 
> Anybody? I know it's an esoteric part of ancient HW that no one cares
> about...
> -Chris
> 
> > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> > ---
> >  tests/gem_softpin.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/tests/gem_softpin.c b/tests/gem_softpin.c
> > index 99388599..23f93623 100644
> > --- a/tests/gem_softpin.c
> > +++ b/tests/gem_softpin.c
> > @@ -302,11 +302,11 @@ static void test_evict_snoop(int fd)
> >  
> >         /* Find a hole */
> >         memset(object, 0, sizeof(object));
> > -       object[0].handle = gem_create(fd, 3*4096);
> > +       object[0].handle = gem_create(fd, 5*4096);
> >         gem_write(fd, object[0].handle, 0, &bbe, sizeof(bbe));
> >         gem_execbuf(fd, &execbuf);
> >         gem_close(fd, object[0].handle);
> > -       hole = object[0].offset;
> > +       hole = object[0].offset + 4096;

I didn't double check the ENOSPC vs. EINVAL details, but a guard page on
each side makes sense to me here.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> >  
> >         /* Create a snoop + uncached pair */
> >         object[0].handle = gem_create(fd, 4096);
> > -- 
> > 2.16.1
> > 
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-- 
Ville Syrjälä
Intel OTC
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