[Intel-gfx] [PATCH] drm/i915: fix whitelist selftests with readonly registers

[Chris Wilson]

Quoting Chris Wilson (2019-06-29 14:13:50)
> From: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
> 
> When a register is readonly there is not much we can tell about its
> value (apart from its default value?). This can be covered by tests
> exercising the value of the register from userspace.
> 
> For PS_INVOCATION_COUNT we've got the following piglit tests :
> 
>    KHR-GL45.pipeline_statistics_query_tests_ARB.functional_fragment_shader_invocations
> 
> Vulkan CTS tests :
> 
>    dEQP-VK.query_pool.statistics_query.fragment_shader_invocations.*
> 
> v2: Use a local to shrink under 80cols.
> 
> Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
> Fixes: 86554f48e511 ("drm/i915/selftests: Verify whitelist of context registers")
> Tested-by: Anuj Phogat <anuj.phogat at gmail.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris