intel: GEM Phase 3-4 — execbuffer submission + page management
gem_execbuffer.rs (80 lines):
ExecObject: batch object with offset, length, gtt_offset, binding flag
RelocationEntry: target handle, delta, offset validation
ExecbufferSubmission: batch objects, relocations, fence tracking
ExecbufferManager: validate → reloc_process → bind → fence_out
AtomicU64 fence counter with per-submission increment
gem_pages.rs (65 lines):
PageManager: BTreeMap<phys_addr, Page> with refcount allocation/free
Page struct: phys_addr, refcount, dirty flag
TtmMoveManager: source→destination region migration
Bump allocator with total/free byte tracking per region
Ported from Linux 7.1:
gem/i915_gem_execbuffer.c → ExecbufferManager + ExecObject
gem/i915_gem_ttm.c → TtmMoveManager
gem/i915_gem_pages.c → PageManager
GEM subdirectory now: 6 files, 515 lines, covering object lifecycle,
memory regions, VMA management, execbuffer, and page management.
vasilito
9c609a8389