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

tools/virtio/ringtest: tweaks for s390 



Make ringtest work on s390 too.

Signed-off-by: default avatarHalil Pasic <pasic@linux.vnet.ibm.com>
Acked-by: default avatarSascha Silbe <silbe@linux.vnet.ibm.com>
Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
parent 21f5eda9

tools/virtio/ringtest/main.h

+12 −0
Original line number Diff line number Diff line
@@ -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