Hi, Christian, On Mon, 2022-02-07 at 12:41 +0100, Christian König wrote: > 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? That wastes precious VRAM. The extra space is needed only when the bo is evicted. We've had a previous short disussion on this here: https://lists.freedesktop.org/archives/dri-devel/2021-August/321161.html Thanks, Thomas > > 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(-) > > > ---------------------------------------------------------------------- Intel Sweden AB Registered Office: Isafjordsgatan 30B, 164 40 Kista, Stockholm, Sweden Registration Number: 556189-6027 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.
