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drm/i915: Use eLLC/LLC by default when available
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@bwidawsk.net> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -53,6 +53,7 @@
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#define HSW_CACHEABILITY_CONTROL(bits) ((((bits) & 0x7) << 1) | \
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(((bits) & 0x8) << (11 - 3)))
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#define HSW_WB_LLC_AGE0 HSW_CACHEABILITY_CONTROL(0x3)
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#define HSW_WB_ELLC_LLC_AGE0 HSW_CACHEABILITY_CONTROL(0xb)
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static gen6_gtt_pte_t gen6_pte_encode(dma_addr_t addr,
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enum i915_cache_level level)
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@ -109,6 +110,18 @@ static gen6_gtt_pte_t hsw_pte_encode(dma_addr_t addr,
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return pte;
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}
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static gen6_gtt_pte_t iris_pte_encode(dma_addr_t addr,
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enum i915_cache_level level)
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{
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gen6_gtt_pte_t pte = GEN6_PTE_VALID;
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pte |= HSW_PTE_ADDR_ENCODE(addr);
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if (level != I915_CACHE_NONE)
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pte |= HSW_WB_ELLC_LLC_AGE0;
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return pte;
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}
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static void gen6_write_pdes(struct i915_hw_ppgtt *ppgtt)
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{
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struct drm_i915_private *dev_priv = ppgtt->dev->dev_private;
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@ -861,7 +874,9 @@ int i915_gem_gtt_init(struct drm_device *dev)
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} else {
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gtt->gtt_probe = gen6_gmch_probe;
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gtt->gtt_remove = gen6_gmch_remove;
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if (IS_HASWELL(dev))
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if (IS_HASWELL(dev) && dev_priv->ellc_size)
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gtt->pte_encode = iris_pte_encode;
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else if (IS_HASWELL(dev))
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gtt->pte_encode = hsw_pte_encode;
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else if (IS_VALLEYVIEW(dev))
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gtt->pte_encode = byt_pte_encode;
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