Commit 80166904 authored by Raghavendra Rao Ananta's avatar Raghavendra Rao Ananta Committed by Marc Zyngier
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KVM: arm64: selftests: Add basic support to generate delays 



Add udelay() support to generate a delay in the guest.

The routines are derived and simplified from kernel's
arch/arm64/lib/delay.c.

Signed-off-by: default avatarRaghavendra Rao Ananta <rananta@google.com>
Reviewed-by: default avatarAndrew Jones <drjones@redhat.com>
Reviewed-by: default avatarOliver Upton <oupton@google.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211007233439.1826892-8-rananta@google.com
parent d977ed39

tools/testing/selftests/kvm/include/aarch64/delay.h

0 → 100644
+25 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/*

 * ARM simple delay routines

 */



#ifndef SELFTEST_KVM_ARM_DELAY_H

#define SELFTEST_KVM_ARM_DELAY_H



#include "arch_timer.h"



static inline void __delay(uint64_t cycles)

{

	enum arch_timer timer = VIRTUAL;

	uint64_t start = timer_get_cntct(timer);



	while ((timer_get_cntct(timer) - start) < cycles)

		cpu_relax();

}



static inline void udelay(unsigned long usec)

{

	__delay(usec_to_cycles(usec));

}



#endif /* SELFTEST_KVM_ARM_DELAY_H */