Quoting Zhi Wang (2017-09-05 20:58:25) > The private PAT management is to support PPAT entry manipulation. Two > APIs are introduced for dynamically managing PPAT entries: intel_ppat_get > and intel_ppat_put. > > intel_ppat_get will search for an existing PPAT entry which perfectly > matches the required PPAT value. If not, it will try to allocate or > return a partially matched PPAT entry if there is any available PPAT > indexes or not. > > intel_ppat_put will put back the PPAT entry which comes from > intel_ppat_get. If it's dynamically allocated, the reference count will > be decreased. If the reference count turns into zero, the PPAT index is > freed again. > > Besides, another two callbacks are introduced to support the private PAT > management framework. One is ppat->update_hw(), which writes the PPAT > configurations in ppat->entries into HW. Another one is ppat->match, which > will return a score to show how two PPAT values match with each other. > > v7: > > - Keep all the register writes unchanged in this patch. (Joonas) > > v6: > > - Address all comments from Chris: > http://www.spinics.net/lists/intel-gfx/msg136850.html > > - Address all comments from Joonas: > http://www.spinics.net/lists/intel-gfx/msg136845.html > > v5: > > - Add check and warnnings for those platforms which don't have PPAT. > > v3: > > - Introduce dirty bitmap for PPAT registers. (Chris) > - Change the name of the pointer "dev_priv" to "i915". (Chris) > - intel_ppat_{get, put} returns/takes a const intel_ppat_entry *. (Chris) > > v2: > > - API re-design. (Chris) > > Cc: Ben Widawsky <benjamin.widawsky@xxxxxxxxx> > Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> > Signed-off-by: Zhi Wang <zhi.a.wang@xxxxxxxxx> > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h > index b4e3aa7..e10ca89 100644 > --- a/drivers/gpu/drm/i915/i915_gem_gtt.h > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h > @@ -143,6 +143,11 @@ typedef u64 gen8_ppgtt_pml4e_t; > #define GEN8_PPAT_ELLC_OVERRIDE (0<<2) > #define GEN8_PPAT(i, x) ((u64)(x) << ((i) * 8)) > > +#define GEN8_PPAT_GET_CA(x) ((x) & 3) > +#define GEN8_PPAT_GET_TC(x) ((x) & (3 << 2)) > +#define GEN8_PPAT_GET_AGE(x) ((x) & (3 << 4)) > +#define CHV_PPAT_GET_SNOOP(x) ((x) & (1 << 6)) One day we will use bitfield.h to our advantage. Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
