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Message-Id: <20210901211412.4171835-6-rananta@google.com>
Date: Wed, 1 Sep 2021 21:14:05 +0000
From: Raghavendra Rao Ananta <rananta@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
James Morse <james.morse@....com>,
Alexandru Elisei <alexandru.elisei@....com>,
Suzuki K Poulose <suzuki.poulose@....com>
Cc: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Peter Shier <pshier@...gle.com>,
Ricardo Koller <ricarkol@...gle.com>,
Oliver Upton <oupton@...gle.com>,
Reiji Watanabe <reijiw@...gle.com>,
Jing Zhang <jingzhangos@...gle.com>,
Raghavendra Rao Anata <rananta@...gle.com>,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH v3 05/12] 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: Raghavendra Rao Ananta <rananta@...gle.com>
---
.../selftests/kvm/include/aarch64/delay.h | 25 +++++++++++++++++++
1 file changed, 25 insertions(+)
create mode 100644 tools/testing/selftests/kvm/include/aarch64/delay.h
diff --git a/tools/testing/selftests/kvm/include/aarch64/delay.h b/tools/testing/selftests/kvm/include/aarch64/delay.h
new file mode 100644
index 000000000000..329e4f5079ea
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/aarch64/delay.h
@@ -0,0 +1,25 @@
+/* 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 */
--
2.33.0.153.gba50c8fa24-goog
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