Hi Fei, On Wed, Apr 19, 2023 at 02:12:17PM -0700, fei.yang@xxxxxxxxx wrote: > From: Fei Yang <fei.yang@xxxxxxxxx> > > This patch is a preparation for replacing enum i915_cache_level with PAT > index. Caching policy for buffer objects is set through the PAT index in > PTE, the old i915_cache_level is not sufficient to represent all caching > modes supported by the hardware. > > Preparing the transition by adding some platform dependent data structures > and helper functions to translate the cache_level to pat_index. > > cachelevel_to_pat: a platform dependent array mapping cache_level to > pat_index. > > max_pat_index: the maximum PAT index supported by the hardware. Needed for > validating the PAT index passed in from user space. > > i915_gem_get_pat_index: function to convert cache_level to PAT index. > > obj_to_i915(obj): macro moved to header file for wider usage. > > I915_MAX_CACHE_LEVEL: upper bound of i915_cache_level for the > convenience of coding. > > Cc: Chris Wilson <chris.p.wilson@xxxxxxxxxxxxxxx> > Cc: Matt Roper <matthew.d.roper@xxxxxxxxx> > Cc: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx> > Signed-off-by: Fei Yang <fei.yang@xxxxxxxxx> Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx> Andi
