drm/radeon: Fix memory allocation failures in the preKMS command stream checking.
Allocation of single large block of memory may fail under memory presure. drm_buffer object can hold one large block of data in multiple independ pages which preents alloation failures. This patch converts all access to command stream to use drm_buffer interface. All direct access to array has to go tough drm_buffer functions to get correct pointer. Outputting the command stream to ring buffer needs to be awear of the split nature of drm_buffer. The output operation requires the new OUT_RING_DRM_BUFFER. Signed-off-by: NPauli Nieminen <suokkos@gmail.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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