[igt-dev] [PATH i-g-t 2/2] tests: add slice power programming test

[Chris Wilson]

Quoting Tvrtko Ursulin (2018-09-05 15:25:44)
> From: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
> 
> Verifies that the kernel programs slices correctly based by reading
> the value of PWR_CLK_STATE register or MI_SET_PREDICATE on platforms
> before Cannonlake.
> 
> v2: Add subslice tests (Lionel)
>     Use MI_SET_PREDICATE for further verification when available (Lionel)
> 
> v3: Rename to gem_ctx_rpcs (Lionel)
> 
> v4: Update kernel API (Lionel)
>     Add 0 value test (Lionel)
>     Exercise invalid values (Lionel)
> 
> v5: Add perf tests (Lionel)
> 
> v6: Add new sysfs entry tests (Lionel)
> 
> v7: Test rsvd fields
>     Update for kernel series changes
> 
> v8: Drop test_no_sseu_support() test (Kelvin)
>     Drop drm_intel_*() apis (Chris)
> 
> v9: by Chris:
>     Drop all do_ioctl/do_ioctl_err()
>     Use gem_context_[gs]et_param()
>     Use gem_read() instead of mapping memory
>     by Lionel:
>     Test dynamic sseu on/off more
> 
> Tvrtko Ursulin:
> 
> v10:
>  * Various style tweaks and refactorings.
>  * New test coverage.

I didn't notice any testing of:
 - param->size
 - feeding garbage into param->value user pointer (always cleared before
   use, perhaps just poison instead), along with abusive pointers.
   E.g., how does the code fare if we pass in an unfaulted GGTT mmap?

We so need a cook book (even automated) for pointer abuse.
-Chris