[Mesa-dev] [PATCH v2 1/6] anv: Add an invalidate_range helper

[Jason Ekstrand]

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

Cc: "13.0 17.0" <mesa-stable at lists.freedesktop.org>
---
 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 da1ca29..5344f07 100644
--- a/src/intel/vulkan/anv_private.h
+++ b/src/intel/vulkan/anv_private.h
@@ -452,6 +452,19 @@ 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)
 {
-- 
2.5.0.400.gff86faf