[PATCH v17 0/8] AuxCCS handling and render compression modifiers

Tvrtko Ursulin
2026-01-28T10:13:50Z

A series to add support for compressed surface scanout under xe with
Alderlake-P.

Currently the auxiliary buffer data isn't mapped into the page tables at all so
cf48bddd31de ("drm/i915/display: Disable AuxCCS framebuffers if built for Xe")
had to disable the support.

On top of that there are missing flushes, invalidations and similar.

Tested with KDE Wayland, on Lenovo Carbon X1 ADL-P:

[PLANE:32:plane 1A]: type=PRI
uapi: [FB:242] AR30 little-endian (0x30335241),0x100000000000008,2880x1800, visible=visible, src=2880.000000x1800.000000+0.000000+0.000000, dst=2880x1800+0+0, rotation=0 (0x00000001)
hw: [FB:242] AR30 little-endian (0x30335241),0x100000000000008,2880x1800, visible=yes, src=2880.000000x1800.000000+0.000000+0.000000, dst=2880x1800+0+0, rotation=0 (0x00000001)

Display working fine - no artefacts, no DMAR/PIPE faults.

All IGTs pass for me locally.

v2:
* More patches added to fix kms_flip_tiling.

v3:
* Rebased after some cleanup patches from v2 were merged.
* Added people to Cc as suggested by Rodrigo.
* Adjusted last patch title. (Rodrigo)
* Apply GGTT flushing only to iomapped system memory buffers.

v4:
* Added patch for potentially misplaced Wa_14016712196.
* Fixed (hopefully) MAX_JOB_SIZE_DW on Meteorlake.

v5:
* Split out ring emission changes to smaller patches.
* Fixed MAX_JOB_SIZE_DW even more.
* Don't emit MI_FLUSH_DW_CCS on !BCS. This should fix Meteorlake.

v6:
* Added AuxCCS invalidation to indirect context workarounds.
* Also added the indirect context handling and some other workarounds. They are
unrelated but the series depends on it.
* Dropped DPT pin alignment reduction since BMG appears not to be liking it for
some reason.

v7:
* Rebased on top of recent xe_fb_pin.c refactoring and also the indirect
context workarounds series.

v8:
* Rebased for bo->size removal.
* Corrected PIPE_CONTROL_FLUSH_L3 to bit 30. (Jose)

v9:
* Fixed fb remapping changes.
* Dropped two not required patches from the series.
* Fixed criteria for GGTT flushing.
* Limit clflush to the compression metadata area.
* Rebased for indirect context workarounds landing upstream.

v10:
* Rebase for XE_GT_WA().

v11:
* Do not use stolen for DPT on IGFX + AuxCCS.

v12:
* Rebased for some ringbuf and LRC code changes.

v13:
* Rebased for various upstream changes.
* Dropped clflush and stolen avoidance patches after merging IGT MOCS 61 usage.

v14:
* MMIO 0x4248 and MI_FLUSH_DW_CCS are MTL+. (Matt)
* Consolidate engine feature checks. (Ville)
* Brought back the patch to put DPT tables in system memory for 100% CI pass
rate. It looks like MOCS 61 is not enough to avoid sporadic pipecrc
mismatches.

v15:
* Limited to enabling on Alderlake-P only. (Dropped all Meteorlake patches.)
* Dropped unrelated GGTT alignment fix. (Sent standalone.)
* Use display parent interface for probing AuxCCS driver support.

v16:
* Use write-combine for DPT in stolen memory. (Ville)
* Dropped clflush patches under assumption pre-production ADL machine were the
reason for sporadic pipecrc failures.

v17:
* Mechanical rebase for upstream conflicts.

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>

Tvrtko Ursulin (8):
drm/xe: Use write-combine mapping when populating DPT
drm/xe/xelpg: Limit AuxCCS ring buffer programming to Alderlake
drm/xe/xelp: Quiesce memory traffic before invalidating AuxCCS
drm/xe/xelp: Wait for AuxCCS invalidation to complete
drm/xe: Export xe_emit_aux_table_inv
drm/xe/xelp: Add AuxCCS invalidation to the indirect context
workarounds
drm/xe/display: Add support for AuxCCS
drm/xe/xelp: Expose AuxCCS frame buffer modifiers on Alderlake-P

drivers/gpu/drm/xe/display/xe_display.c | 8 ++
drivers/gpu/drm/xe/display/xe_fb_pin.c | 114 +++++++++++++-----
.../gpu/drm/xe/instructions/xe_mi_commands.h | 6 +
drivers/gpu/drm/xe/xe_hw_engine.h | 24 ++++
drivers/gpu/drm/xe/xe_lrc.c | 27 +++++
drivers/gpu/drm/xe/xe_ring_ops.c | 85 ++++++++-----
drivers/gpu/drm/xe/xe_ring_ops.h | 3 +
drivers/gpu/drm/xe/xe_ring_ops_types.h | 2 +-
8 files changed, 207 insertions(+), 62 deletions(-)

--
2.52.0