[PATCH v2 4/9] drm/vc4: Add an API for creating GPU shaders in GEM BOs.

Since we have no MMU, the kernel needs to validate that the submitted shader code won't make any accesses to memory that the user doesn't control, which involves banning some operations (general purpose DMA writes), and tracking where we need to write out pointers for other operations (texture

[PATCH v2 4/9] drm/vc4: Add an API for creating GPU shaders in GEM BOs.

Since we have no MMU, the kernel needs to validate that the submitted shader code won't make any accesses to memory that the user doesn't control, which involves banning some operations (general purpose DMA writes), and tracking where we need to write out pointers for other operations (texture