We could be using write combining map through which we insert
our ptes. Make sure to flush the write combining buffer
after the writes.
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.a...@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuopp...@linux.intel.com>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c
b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 6434ebe8c033..dcac8bd604ab 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1077,6 +1077,9 @@ static void gen8_ppgtt_insert_3lvl(struct
i915_address_space *vm,
cache_level);
vma->page_sizes.gtt = I915_GTT_PAGE_SIZE;
+
+ /* Flush write combining buffer */
+ wmb();
}
static void gen8_ppgtt_insert_huge_entries(struct i915_vma *vma,
@@ -1196,6 +1199,9 @@ static void gen8_ppgtt_insert_4lvl(struct
i915_address_space *vm,
vma->page_sizes.gtt = I915_GTT_PAGE_SIZE;
}
+
+ /* Flush write combining buffer */
+ wmb();
}
static void gen8_free_page_tables(struct i915_address_space *vm,
--
2.14.1
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