[Intel-gfx] [RFC 0/2] drm/i915/ttm: Evict and store of compressed object

Ramalingam C ramalingam.c at intel.com
Mon Feb 7 09:37:41 UTC 2022

On flat-ccs capable platform we need to evict and resore the ccs data
along with the corresponding main memory.

This ccs data can only be access through BLT engine through a special
cmd ( )

To support above requirement of flat-ccs enabled i915 platforms this
series adds new param called ccs_pages_needed to the ttm_tt_init(),
to increase the ttm_tt->num_pages of system memory when the obj has the
lmem placement possibility.

This will be on top of the flat-ccs enabling series

For more about flat-ccs feature please have a look at

Testing of the series is WIP and looking forward for the early review on
the amendment to ttm_tt_init and the approach.

Ramalingam C (2):
  drm/i915/ttm: Add extra pages for handling ccs data
  drm/i915/migrate: Evict and restore the ccs data

 drivers/gpu/drm/drm_gem_vram_helper.c      |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_ttm.c    |  23 +-
 drivers/gpu/drm/i915/gt/intel_migrate.c    | 283 +++++++++++----------
 drivers/gpu/drm/qxl/qxl_ttm.c              |   2 +-
 drivers/gpu/drm/ttm/ttm_agp_backend.c      |   2 +-
 drivers/gpu/drm/ttm/ttm_tt.c               |  12 +-
 drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c |   2 +-
 include/drm/ttm/ttm_tt.h                   |   4 +-
 8 files changed, 191 insertions(+), 139 deletions(-)


More information about the Intel-gfx mailing list