From: Raghavendra Rao Ananta <rananta@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>, Marc Zyngier <maz@kernel.org>
Cc: kvm@vger.kernel.org, Peter Shier <pshier@google.com>,
Raghavendra Rao Anata <rananta@google.com>,
kvmarm@lists.cs.columbia.edu
Subject: [PATCH 04/10] KVM: arm64: selftests: Add basic support for arch_timers
Date: Fri, 13 Aug 2021 21:12:05 +0000 [thread overview]
Message-ID: <20210813211211.2983293-5-rananta@google.com> (raw)
In-Reply-To: <20210813211211.2983293-1-rananta@google.com>
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@google.com>
---
.../kvm/include/aarch64/arch_timer.h | 138 ++++++++++++++++++
1 file changed, 138 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..e6144ab95348
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM Generic Interrupt Controller (GIC) specific defines
+ */
+
+#ifndef SELFTEST_KVM_ARCH_TIMER_H
+#define SELFTEST_KVM_ARCH_TIMER_H
+
+#include <linux/sizes.h>
+
+#include "processor.h"
+
+enum arch_timer {
+ VIRTUAL,
+ PHYSICAL,
+};
+
+#define CTL_ENABLE (1 << 0)
+#define CTL_ISTATUS (1 << 2)
+#define CTL_IMASK (1 << 1)
+
+#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:
+ return write_sysreg(cntv_cval_el0, cval);
+ case PHYSICAL:
+ return write_sysreg(cntp_cval_el0, cval);
+ 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:
+ return write_sysreg(cntv_tval_el0, tval);
+ case PHYSICAL:
+ return write_sysreg(cntp_tval_el0, tval);
+ default:
+ GUEST_ASSERT_1(0, timer);
+ }
+
+ isb();
+}
+
+static inline void timer_set_ctl(enum arch_timer timer, uint32_t ctl)
+{
+ switch (timer) {
+ case VIRTUAL:
+ return write_sysreg(cntv_ctl_el0, ctl);
+ case PHYSICAL:
+ return write_sysreg(cntp_ctl_el0, ctl);
+ 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.rc1.237.g0d66db33f3-goog
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next prev parent reply other threads:[~2021-08-15 17:01 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-13 21:12 [PATCH 00/10] KVM: arm64: selftests: Introduce arch_timer selftest Raghavendra Rao Ananta
2021-08-13 21:12 ` [PATCH 01/10] KVM: arm64: selftests: Add MMIO readl/writel support Raghavendra Rao Ananta
2021-08-13 21:12 ` [PATCH 02/10] KVM: arm64: selftests: Add write_sysreg_s and read_sysreg_s Raghavendra Rao Ananta
2021-08-13 21:12 ` [PATCH 03/10] KVM: arm64: selftests: Add support for cpu_relax Raghavendra Rao Ananta
2021-08-13 21:12 ` Raghavendra Rao Ananta [this message]
2021-08-14 9:10 ` [PATCH 04/10] KVM: arm64: selftests: Add basic support for arch_timers Zenghui Yu
2021-08-16 20:01 ` Raghavendra Rao Ananta
2021-08-13 21:12 ` [PATCH 05/10] KVM: arm64: selftests: Add basic support to generate delays Raghavendra Rao Ananta
2021-08-13 21:12 ` [PATCH 06/10] KVM: arm64: selftests: Add support to disable and enable local IRQs Raghavendra Rao Ananta
2021-08-13 21:12 ` [PATCH 07/10] KVM: arm64: selftests: Add support to get the vcpuid from MPIDR_EL1 Raghavendra Rao Ananta
2021-08-13 21:12 ` [PATCH 08/10] KVM: arm64: selftests: Add light-weight spinlock support Raghavendra Rao Ananta
2021-08-13 21:12 ` [PATCH 09/10] KVM: arm64: selftests: Add basic GICv3 support Raghavendra Rao Ananta
2021-08-13 21:12 ` [PATCH 10/10] KVM: arm64: selftests: Add arch_timer test Raghavendra Rao Ananta
2021-08-16 12:15 ` [PATCH 00/10] KVM: arm64: selftests: Introduce arch_timer selftest Andrew Jones
2021-08-16 20:56 ` Raghavendra Rao Ananta
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