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

[Christian König]

Am 07.02.22 um 10:37 schrieb Ramalingam C:
> 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.

Well question is why isn't the buffer object allocated with the extra 
space in the first place?

Regards,
Christian.

>
> This will be on top of the flat-ccs enabling series
> https://patchwork.freedesktop.org/series/95686/
>
> For more about flat-ccs feature please have a look at
> https://patchwork.freedesktop.org/patch/471777/?series=95686&rev=5
>
> 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(-)
>