On Wed, May 14, 2025 at 10:53:16AM -0700, Rob Clark wrote: > From: Rob Clark <robdcl...@chromium.org> > > Eases migration for drivers where VAs don't hold hard references to > their associated BO, avoiding reference loops. > > In particular, msm uses soft references to optimistically keep around > mappings until the BO is distroyed. Which obviously won't work if the > VA (the mapping) is holding a reference to the BO.
Ick! This is all complicated enough. Allow drivers to bypass the proper reference counting for GEM objects in the context of VM_BO structures seems like an insane footgun. I don't understand why MSM would need weak references here. Why does msm need that, but nouveau, Xe, panthor, PowerVR do not?
