Emil Velikov authored Feb 08, 2019 and Emil Velikov committed Feb 13, 2019

As the inline comment says, this test checks that the kernel allows
unauthenticated master with render capable, RENDER_ALLOW ioctls.

The kernel commit has extra details why.

v2:
 - drop RUN_AS_ROOT guard
 - call check_auth() on the {,un}authenticated device
 - check the device is PRIME (import) capable
 - check the device has render node
 - tweak expectations based on above three
 - elaborate why we care only about -EACCES

v3:
 - fold into existing core_auth.c
 - move igt_assert within the subtest
 - make has_prime_import() an igt_require()
 - check for BADF before and after, as requested. Not strictly needed.
 - swap igt_info+drm_open_driver with comment + __drm_open_driver
Former calls igt_skip() which is problematic with igt_fork().

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> (irc)