linux-kernel - [PATCH 2/2] tools/virtio/ringtest: tweaks for s390

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Date:   Mon, 19 Sep 2016 17:06:56 +0200
From:   Cornelia Huck <cornelia.huck@...ibm.com>
To:     mst@...hat.com
Cc:     pasic@...ux.vnet.ibm.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        Cornelia Huck <cornelia.huck@...ibm.com>
Subject: [PATCH 2/2] tools/virtio/ringtest: tweaks for s390

From: Halil Pasic <pasic@...ux.vnet.ibm.com>

Make ringtest work on s390 too.

Signed-off-by: Halil Pasic <pasic@...ux.vnet.ibm.com>
Acked-by: Sascha Silbe <silbe@...ux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>
---
 tools/virtio/ringtest/main.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/virtio/ringtest/main.h b/tools/virtio/ringtest/main.h
index 16917ac..7806b7b 100644
--- 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
-- 
2.8.4