tools/virtio/ringtest: tweaks for s390

Make ringtest work on s390 too. Signed-off-by: Halil Pasic <[email protected]> Acked-by: Sascha Silbe <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
mrcsosa · Jan 19, 2017 · 47a4c49 · 47a4c49
1 parent 21f5eda
commit 47a4c49
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/tools/virtio/ringtest/main.h b/tools/virtio/ringtest/main.h
@@ -26,6 +26,16 @@ static inline void wait_cycles(unsigned long long cycles)
 #define VMEXIT_CYCLES 500
 #define VMENTRY_CYCLES 500
 
+#elif defined(__s390x__)
+static inline void wait_cycles(unsigned long long cycles)
+{
+	asm volatile("0: brctg %0,0b" : : "d" (cycles));
+}
+
+/* tweak me */
+#define VMEXIT_CYCLES 200
+#define VMENTRY_CYCLES 200
+
 #else
 static inline void wait_cycles(unsigned long long cycles)
 {
@@ -81,6 +91,8 @@ extern unsigned ring_size;
 /* Is there a portable way to do this? */
 #if defined(__x86_64__) || defined(__i386__)
 #define cpu_relax() asm ("rep; nop" ::: "memory")
+#elif defined(__s390x__)
+#define cpu_relax() barrier()
 #else
 #define cpu_relax() assert(0)
 #endif