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KVM: arm64: selftests: Add basic support to generate delays

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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: Raghavendra Rao Ananta <rananta@google.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Oliver Upton <oupton@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211007233439.1826892-8-rananta@google.com
This commit is contained in:
Raghavendra Rao Ananta 2021-10-07 23:34:31 +00:00 committed by Marc Zyngier
parent d977ed3994
commit 8016690465
1 changed files with 25 additions and 0 deletions
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25
tools/testing/selftests/kvm/include/aarch64/delay.h Normal file
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/* 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 */