On Thu, Jul 04, 2013 at 11:02:06AM -0700, Ben Widawsky wrote: > DRI clients really should be using MOCS to get fine grained streaming > cache controls. With that note, I *hope* that this patch doesn't improve > performance overwhelmingly, because if it does - it means there is a > problem elsewhere. > > In any case, the kernel, and old userspace should get some benefit from > this, so let's do it. eLLC is always a good default, and really not > using it is the special case for MOCS. > > References: http://www.intel.com/newsroom/kits/restricted/ha$well!/pdfs/4th_Gen_Intel_Core_PressBriefing_5-29.pdf (page 57) > > Signed-off-by: Ben Widawsky <ben at bwidawsk.net> Iris is the marketing name and likely to stick around for a bit (like HD Graphics), I'd vote to use the codename for this thing here, i.e. crw. -Daniel > --- > drivers/gpu/drm/i915/i915_gem_gtt.c | 17 ++++++++++++++++- > 1 file changed, 16 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c > index 42262d0..0ff8073 100644 > --- a/drivers/gpu/drm/i915/i915_gem_gtt.c > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c > @@ -53,6 +53,7 @@ > #define HSW_CACHEABILITY_CONTROL(bits) ((((bits) & 0x7) << 1) | \ > (((bits) & 0x8) << (11 - 3))) > #define HSW_WB_LLC_AGE0 HSW_CACHEABILITY_CONTROL(0x3) > +#define HSW_WB_ELLC_LLC_AGE0 HSW_CACHEABILITY_CONTROL(0xb) > > static gen6_gtt_pte_t gen6_pte_encode(dma_addr_t addr, > enum i915_cache_level level) > @@ -109,6 +110,18 @@ static gen6_gtt_pte_t hsw_pte_encode(dma_addr_t addr, > return pte; > } > > +static gen6_gtt_pte_t iris_pte_encode(dma_addr_t addr, > + enum i915_cache_level level) > +{ > + gen6_gtt_pte_t pte = GEN6_PTE_VALID; > + pte |= HSW_PTE_ADDR_ENCODE(addr); > + > + if (level != I915_CACHE_NONE) > + pte |= HSW_WB_ELLC_LLC_AGE0; > + > + return pte; > +} > + > static void gen6_write_pdes(struct i915_hw_ppgtt *ppgtt) > { > struct drm_i915_private *dev_priv = ppgtt->dev->dev_private; > @@ -860,7 +873,9 @@ int i915_gem_gtt_init(struct drm_device *dev) > } else { > gtt->gtt_probe = gen6_gmch_probe; > gtt->gtt_remove = gen6_gmch_remove; > - if (IS_HASWELL(dev)) > + if (IS_HASWELL(dev) && dev_priv->ellc_size) > + gtt->pte_encode = iris_pte_encode; > + else if (IS_HASWELL(dev)) > gtt->pte_encode = hsw_pte_encode; > else if (IS_VALLEYVIEW(dev)) > gtt->pte_encode = byt_pte_encode; > -- > 1.8.3 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx at lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch
