drm/i915/ttm: add ttm_buddy_man

Add back our standalone i915_buddy allocator and integrate it into a
ttm_resource_manager. This will plug into our ttm backend for managing
device local-memory in the next couple of patches.

v2(Thomas):
    - Return -ENOSPC from the buddy; ttm expects this in order to
      trigger eviction
    - Drop the unnecessary inline
    - bo->page_alignment is in page units

Signed-off-by: Matthew Auld <[email protected]>
Cc: Thomas Hellström <[email protected]>
Acked-by: Thomas Hellström <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: matt-auld

drivers/gpu/drm/i915/Makefile

@@ -162,6 +162,7 @@ gem-y += \
 i915-y += \
 	  $(gem-y) \
 	  i915_active.o \
+	  i915_buddy.o \
 	  i915_cmd_parser.o \
 	  i915_gem_evict.o \
 	  i915_gem_gtt.o \
@@ -171,6 +172,7 @@ i915-y += \
 	  i915_request.o \
 	  i915_scheduler.o \
 	  i915_trace_points.o \
+	  i915_ttm_buddy_manager.o \
 	  i915_vma.o \
 	  intel_wopcm.o