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Message-Id: <20210901211412.4171835-5-rananta@google.com>
Date: Wed, 1 Sep 2021 21:14:04 +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 04/12] KVM: arm64: selftests: Add basic support for arch_timers
Add a minimalistic library support to access the virtual timers,
that can be used for simple timing functionalities, such as
introducing delays in the guest.
Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
---
.../kvm/include/aarch64/arch_timer.h | 142 ++++++++++++++++++
1 file changed, 142 insertions(+)
create mode 100644 tools/testing/selftests/kvm/include/aarch64/arch_timer.h
diff --git a/tools/testing/selftests/kvm/include/aarch64/arch_timer.h b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
new file mode 100644
index 000000000000..9df5b63abc47
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
@@ -0,0 +1,142 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM Generic Timer specific interface
+ */
+
+#ifndef SELFTEST_KVM_ARCH_TIMER_H
+#define SELFTEST_KVM_ARCH_TIMER_H
+
+#include "processor.h"
+
+enum arch_timer {
+ VIRTUAL,
+ PHYSICAL,
+};
+
+#define CTL_ENABLE (1 << 0)
+#define CTL_IMASK (1 << 1)
+#define CTL_ISTATUS (1 << 2)
+
+#define msec_to_cycles(msec) \
+ (timer_get_cntfrq() * (uint64_t)(msec) / 1000)
+
+#define usec_to_cycles(usec) \
+ (timer_get_cntfrq() * (uint64_t)(usec) / 1000000)
+
+#define cycles_to_usec(cycles) \
+ ((uint64_t)(cycles) * 1000000 / timer_get_cntfrq())
+
+static inline uint32_t timer_get_cntfrq(void)
+{
+ return read_sysreg(cntfrq_el0);
+}
+
+static inline uint64_t timer_get_cntct(enum arch_timer timer)
+{
+ isb();
+
+ switch (timer) {
+ case VIRTUAL:
+ return read_sysreg(cntvct_el0);
+ case PHYSICAL:
+ return read_sysreg(cntpct_el0);
+ default:
+ GUEST_ASSERT_1(0, timer);
+ }
+
+ /* We should not reach here */
+ return 0;
+}
+
+static inline void timer_set_cval(enum arch_timer timer, uint64_t cval)
+{
+ switch (timer) {
+ case VIRTUAL:
+ write_sysreg(cntv_cval_el0, cval);
+ break;
+ case PHYSICAL:
+ write_sysreg(cntp_cval_el0, cval);
+ break;
+ default:
+ GUEST_ASSERT_1(0, timer);
+ }
+
+ isb();
+}
+
+static inline uint64_t timer_get_cval(enum arch_timer timer)
+{
+ switch (timer) {
+ case VIRTUAL:
+ return read_sysreg(cntv_cval_el0);
+ case PHYSICAL:
+ return read_sysreg(cntp_cval_el0);
+ default:
+ GUEST_ASSERT_1(0, timer);
+ }
+
+ /* We should not reach here */
+ return 0;
+}
+
+static inline void timer_set_tval(enum arch_timer timer, uint32_t tval)
+{
+ switch (timer) {
+ case VIRTUAL:
+ write_sysreg(cntv_tval_el0, tval);
+ break;
+ case PHYSICAL:
+ write_sysreg(cntp_tval_el0, tval);
+ break;
+ default:
+ GUEST_ASSERT_1(0, timer);
+ }
+
+ isb();
+}
+
+static inline void timer_set_ctl(enum arch_timer timer, uint32_t ctl)
+{
+ switch (timer) {
+ case VIRTUAL:
+ write_sysreg(cntv_ctl_el0, ctl);
+ break;
+ case PHYSICAL:
+ write_sysreg(cntp_ctl_el0, ctl);
+ break;
+ default:
+ GUEST_ASSERT_1(0, timer);
+ }
+
+ isb();
+}
+
+static inline uint32_t timer_get_ctl(enum arch_timer timer)
+{
+ switch (timer) {
+ case VIRTUAL:
+ return read_sysreg(cntv_ctl_el0);
+ case PHYSICAL:
+ return read_sysreg(cntp_ctl_el0);
+ default:
+ GUEST_ASSERT_1(0, timer);
+ }
+
+ /* We should not reach here */
+ return 0;
+}
+
+static inline void timer_set_next_cval_ms(enum arch_timer timer, uint32_t msec)
+{
+ uint64_t now_ct = timer_get_cntct(timer);
+ uint64_t next_ct = now_ct + msec_to_cycles(msec);
+
+ timer_set_cval(timer, next_ct);
+}
+
+static inline void timer_set_next_tval_ms(enum arch_timer timer, uint32_t msec)
+{
+ timer_set_tval(timer, msec_to_cycles(msec));
+}
+
+#endif /* SELFTEST_KVM_ARCH_TIMER_H */
--
2.33.0.153.gba50c8fa24-goog
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