From: Andrew Jones <drjones@redhat.com>
To: qemu-devel@nongnu.org, qemu-arm@nongnu.org
Cc: peter.maydell@linaro.org, richard.henderson@linaro.org,
bijan.mottahedeh@oracle.com, maz@kernel.org
Subject: [PATCH v1 2/5] timer: arm: Introduce functions to get the host cntfrq
Date: Wed, 16 Oct 2019 16:34:07 +0200 [thread overview]
Message-ID: <20191016143410.5023-3-drjones@redhat.com> (raw)
In-Reply-To: <20191016143410.5023-1-drjones@redhat.com>
When acceleration like KVM is in use it's necessary to use the host's
counter frequency when converting ticks to or from time units.
Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
include/qemu/timer.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/include/qemu/timer.h b/include/qemu/timer.h
index 85bc6eb00b21..8941ddea8242 100644
--- a/include/qemu/timer.h
+++ b/include/qemu/timer.h
@@ -1006,6 +1006,22 @@ static inline int64_t cpu_get_host_ticks(void)
}
#endif
+#if defined(__aarch64__)
+static inline uint32_t cpu_get_host_tick_frequency(void)
+{
+ uint64_t frq;
+ asm volatile("mrs %0, cntfrq_el0" : "=r" (frq));
+ return frq;
+}
+#elif defined(__arm__)
+static inline uint32_t cpu_get_host_tick_frequency(void)
+{
+ uint32_t frq;
+ asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (frq));
+ return frq;
+}
+#endif
+
#ifdef CONFIG_PROFILER
static inline int64_t profile_getclock(void)
{
--
2.21.0
next prev parent reply other threads:[~2019-10-16 14:39 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-16 14:34 [PATCH v1 0/5] target/arm/kvm: Provide an option to adjust virtual time Andrew Jones
2019-10-16 14:34 ` [PATCH v1 1/5] target/arm/kvm64: kvm64 cpus have timer registers Andrew Jones
2019-10-16 14:34 ` Andrew Jones [this message]
2019-12-10 15:47 ` [PATCH v1 2/5] timer: arm: Introduce functions to get the host cntfrq Peter Maydell
2019-12-10 16:41 ` Andrew Jones
2019-10-16 14:34 ` [PATCH v1 3/5] target/arm/kvm: Implement cpu feature kvm-adjvtime Andrew Jones
2019-12-10 15:54 ` Peter Maydell
2019-12-10 16:10 ` Andrew Jones
2019-10-16 14:34 ` [PATCH v1 4/5] tests/arm-cpu-features: Check feature default values Andrew Jones
2019-10-16 14:34 ` [PATCH v1 5/5] target/arm/cpu: Add the kvm-adjvtime CPU property Andrew Jones
2019-10-17 21:17 ` [PATCH v1 0/5] target/arm/kvm: Provide an option to adjust virtual time Masayoshi Mizuma
2019-10-18 12:02 ` Andrew Jones
2019-10-28 18:39 ` Masayoshi Mizuma
2019-12-06 15:22 ` Peter Maydell
2019-12-06 15:53 ` Andrew Jones
2019-12-10 9:51 ` Andrea Bolognani
2019-12-10 10:29 ` Peter Maydell
2019-12-10 11:05 ` Andrew Jones
2019-12-10 11:48 ` Peter Maydell
2019-12-10 13:32 ` Andrew Jones
2019-12-10 14:21 ` Andrea Bolognani
2019-12-10 14:33 ` Andrew Jones
2019-12-10 15:47 ` Andrea Bolognani
2019-12-10 16:08 ` Andrew Jones
2019-12-10 17:16 ` Andrea Bolognani
2019-12-10 15:45 ` Peter Maydell
2019-12-11 8:02 ` Guoheyi
2019-12-11 9:00 ` Andrew Jones
2019-12-11 13:50 ` Guoheyi
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