2021-09-01 21:16:45

by Raghavendra Rao Ananta

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 <[email protected]>
---
.../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

2021-09-02 14:40:27

by Andrew Jones

Subject: Re: [PATCH v3 05/12] KVM: arm64: selftests: Add basic support to generate delays

On Wed, Sep 01, 2021 at 09:14:05PM +0000, Raghavendra Rao Ananta wrote:
> 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 <[email protected]>
> ---
> .../selftests/kvm/include/aarch64/delay.h | 25 +++++++++++++++++++
> 1 file changed, 25 insertions(+)
> create mode 100644 tools/testing/selftests/kvm/include/aarch64/delay.h
>

Reviewed-by: Andrew Jones <[email protected]>

2021-09-03 01:14:04

by Oliver Upton

Subject: Re: [PATCH v3 05/12] KVM: arm64: selftests: Add basic support to generate delays

On Wed, Sep 1, 2021 at 2:14 PM Raghavendra Rao Ananta
<[email protected]> wrote:
>
> 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 <[email protected]>
> ---
> .../selftests/kvm/include/aarch64/delay.h | 25 +++++++++++++++++++
> 1 file changed, 25 insertions(+)
> create mode 100644 tools/testing/selftests/kvm/include/aarch64/delay.h
>

Reviewed-by: Oliver Upton <[email protected]>