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tools/virtio/ringtest: tweaks for s390

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Make ringtest work on s390 too.

Signed-off-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Acked-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Halil Pasic 2016-09-02 17:59:36 +02:00 committed by Michael S. Tsirkin
parent 21f5eda9b8
commit 47a4c49af6
1 changed files with 12 additions and 0 deletions
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12
tools/virtio/ringtest/main.h
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@ -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