Hi Fei, On Tue, Jun 06, 2023 at 12:00:42PM +0200, Andi Shyti wrote: > From: Fei Yang <fei.yang@xxxxxxxxx> > > To comply with the design that buffer objects shall have immutable > cache setting through out their life cycle, {set, get}_caching ioctl's > are no longer supported from MTL onward. With that change caching > policy can only be set at object creation time. The current code > applies a default (platform dependent) cache setting for all objects. > However this is not optimal for performance tuning. The patch extends > the existing gem_create uAPI to let user set PAT index for the object > at creation time. > The new extension is platform independent, so UMD's can switch to using > this extension for older platforms as well, while {set, get}_caching are > still supported on these legacy paltforms for compatibility reason. > However, since PAT index was not clearly defined for platforms prior to > GEN12 (TGL), so we are limiting this externsion to GEN12+ platforms > only. See ext_set_pat() in for the implementation details. > > Note: The documentation related to the PAT/MOCS tables is currently > available for Tiger Lake here: > https://www.intel.com/content/www/us/en/docs/graphics-for-linux/developer-reference/1-0/tiger-lake.html > > BSpec: 45101 > > Mesa support has been submitted in this merge request: > https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22878 > > The media driver is supported by the following commits: > https://github.com/intel/media-driver/commit/92c00a857433ebb34ec575e9834f473c6fcb6341 > https://github.com/intel/media-driver/commit/fd375cf2c5e1f6bf6b43258ff797b3134aadc9fd > https://github.com/intel/media-driver/commit/08dd244b22484770a33464c2c8ae85430e548000 > > The IGT test related to this change is > igt@gem_create@create-ext-set-pat > > Signed-off-by: Fei Yang <fei.yang@xxxxxxxxx> > Cc: Chris Wilson <chris.p.wilson@xxxxxxxxxxxxxxx> > Cc: Matt Roper <matthew.d.roper@xxxxxxxxx> > Cc: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx> > Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx> > Acked-by: Jordan Justen <jordan.l.justen@xxxxxxxxx> > Tested-by: Jordan Justen <jordan.l.justen@xxxxxxxxx> > Acked-by: Carl Zhang <carl.zhang@xxxxxxxxx> > Tested-by: Lihao Gu <lihao.gu@xxxxxxxxx> > Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx> pushed to drm-intel-gt-next with: - Tvrtko's ack - Slawek's ack - the pull request link from media guys Thank you! Andi