vgsp-disp: host-side EVO display engine (channels, push buffer, notifier, raster)

The guest nvidia-modeset drives the display through per-channel NV-DMA
push buffers kicked via the BAR0 UDISP control windows.  Emulate that
engine contract host-side, unmodified guest:

- channel registration: display-channel RM objects (core 0xc57d, window
  0xc57e, cursor 0xc57b, 0xc57a) are noted from the alloc stream, and the
  internal control NV2080_CTRL_CMD_INTERNAL_DISPLAY_CHANNEL_PUSHBUFFER
  (0x20800a58) records each push buffer (guest PA, size, class,
  instance, validity);
- PUT polling + GET publication in the channel control pages (core
  0x680000, window 0x690000+n*0x1000, cursor 0x6D8000+n*0x1000);
- NV-DMA method parser (METHOD/ONE_INC/NONINC/JUMP/SET_SUBDEVICE_MASK)
  with the wrap-JUMP follow;
- completion: SET_CONTEXT_DMA_NOTIFIER / SET_NOTIFIER_CONTROL tracking,
  exact notifier-surface resolution through the display instance hash
  table (no heuristic writes), NV_DISP_NOTIFIER FINISHED on UPDATE
  (0x200), and the channel completion event post;
- free-running 1080p60 raster line for NVC57E_GET_LINE.

All effects are behind independent knobs (disp_engine, disp_finish,
disp_vblank, disp_events, disp_notifier_pa) with verbose diagnostics
(disp_dbg, disp_dump), so the previous behaviour stays one load away.

0 files changed, 0 insertions, 0 deletions