[PATCH 12/20] drm/i915: support 2M pages for the 48b PPGTT

Matthew Auld matthew.auld at intel.com
Tue Jun 27 10:48:14 UTC 2017


Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 8 ++++++++
 drivers/gpu/drm/i915/i915_gem_gtt.h | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 861b1442b6c4..be11c83d5c91 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -972,6 +972,14 @@ static void gen8_ppgtt_insert_huge_entries(struct i915_vma *vma,
 			max = GEN8_PML4ES_PER_PML4;
 			page_size = I915_GTT_PAGE_SIZE_1G;
 			encode |= GEN8_PDPE_PS_1G;
+		} else if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_2M &&
+			   IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_2M) &&
+			   rem >= I915_GTT_PAGE_SIZE_2M && !idx.pte) {
+			vaddr = kmap_atomic_px(pd);
+			index = idx.pde;
+			max = I915_PDES;
+			page_size = I915_GTT_PAGE_SIZE_2M;
+			encode |= GEN8_PDE_PS_2M;
 		} else {
 			vaddr = kmap_atomic_px(pt);
 			index = idx.pte;
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index e46f05f0cfd9..aa4488637fc9 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -149,6 +149,8 @@ typedef u64 gen8_ppgtt_pml4e_t;
 #define GEN8_PPAT_ELLC_OVERRIDE		(0<<2)
 #define GEN8_PPAT(i, x)			((u64)(x) << ((i) * 8))
 
+#define GEN8_PDE_PS_2M   BIT(7)
+
 #define GEN8_PDPE_PS_1G  BIT(7)
 
 struct sg_table;
-- 
2.9.4



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