i965: Add virtual memory allocator infrastructure to brw_bufmgr.
This introduces a new fast virtual memory allocator integrated with our BO cache bucketing. For larger objects, it falls back to the simple free-list allocator (util_vma). This puts the allocators in place but doesn't enable softpin yet. v2: (feedback from Chris Wilson) - Check (bo->kflags & EXEC_OBJECT_PINNED) instead of a global flag - Avoid vma_free(0ull) on the err_free path. - Only enable if the kernel says we have full PPGTT support - Make bucketing allocators more resistant to failing to grow arrays (feedback from Scott Phillips) - Don't use node after popping it from the list. - Avoid undefined behavior in canonicalization by reusing new helper - Comment updates (feedback from myself) - Avoid __vma_alloc vs. vma_alloc by making a zero_high_bits helper to return a non-canonical address with the high bits zeroed. - Don't shadow loop variable 'i' when destroying things (ugly; worked) v3: - Replace zero_high_bits with new common gen_48b_address helper. Reviewed-by:Scott D Phillips <scott.d.phillips@intel.com> Reviewed-by:
Jordan Justen <jordan.l.justen@intel.com>