From 0516a999235c143bbc3c372874675c65176c10c9 Mon Sep 17 00:00:00 2001
From: Jason Ekstrand <jason.ekstrand@intel.com>
Date: Mon, 20 Feb 2017 10:18:57 -0800
Subject: [PATCH] anv: Add an invalidate_range helper

This is similar to clflush_range except that it puts the mfence on the
other side to ensure caches are flushed prior to reading.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: "13.0 17.0" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit 8582ab2d6eff1d8fc1964ba0f353037af212bdfe)
---
 src/intel/vulkan/anv_private.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/intel/vulkan/anv_private.h b/src/intel/vulkan/anv_private.h
index 75f2bde66a8..52e6ed5a14f 100644
--- a/src/intel/vulkan/anv_private.h
+++ b/src/intel/vulkan/anv_private.h
@@ -429,6 +429,19 @@ anv_clflush_range(void *start, size_t size)
    }
 }
 
+static inline void
+anv_invalidate_range(void *start, size_t size)
+{
+   void *p = (void *) (((uintptr_t) start) & ~CACHELINE_MASK);
+   void *end = start + size;
+
+   while (p < end) {
+      __builtin_ia32_clflush(p);
+      p += CACHELINE_SIZE;
+   }
+   __builtin_ia32_mfence();
+}
+
 static void inline
 anv_state_clflush(struct anv_state state)
 {