Commit 47a4c49a authored by Halil Pasic's avatar Halil Pasic Committed by Michael S. Tsirkin

tools/virtio/ringtest: tweaks for s390

Make ringtest work on s390 too.
Signed-off-by: default avatarHalil Pasic <[email protected]>
Acked-by: default avatarSascha Silbe <[email protected]>
Signed-off-by: default avatarCornelia Huck <[email protected]>
parent 21f5eda9
......@@ -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
......
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