[Intel-gfx] [PATCH v4 3/6] drm/i915/ttm: Drop region reference counting

[Matthew Auld]

On 18/11/2021 13:02, Thomas Hellström wrote:
> There is an interesting refcounting loop:
> struct intel_memory_region has a struct ttm_resource_manager,
> ttm_resource_manager->move may hold a reference to i915_request,
> i915_request may hold a reference to intel_context,
> intel_context may hold a reference to drm_i915_gem_object,
> drm_i915_gem_object may hold a reference to intel_memory_region.
> 
> Break this loop by dropping region reference counting.
> 
> In addition, Have regions with a manager moving fence make sure
> that all region objects are released before freeing the region.
> 
> Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>