libgralloc-qsd8k: Invalidate the ashmem cache

Invalidate the ashmem cache after allocating an ashmem buffer.

Change-Id: I874711297c983d64646e069c17c1f2880c4af3d9

gpu.cpp

@@ -21,6 +21,10 @@
 
 #include <sys/mman.h>
 
+#ifdef HOST
+#include <linux/ashmem.h>
+#endif
+
 #include "gr.h"
 #include "gpu.h"
 
@@ -154,6 +158,11 @@ int gpu_context_t::alloc_ashmem_buffer(size_t size, unsigned int postfix, void**
         *pFd = fd;
         *pBase = base;
         *pOffset = offset;
+#ifdef HOST
+        if (ioctl(fd, ASHMEM_CACHE_INV_RANGE, NULL)) {
+            LOGE("ASHMEM_CACHE_INV_RANGE failed fd = %d", fd);
+        }
+#endif
     }
     return err;
 }