[PATCH v8 2/6] arm64: hyperv: Add Hyper-V clocksource/clockevent support

Michael Kelley
2021-02-18T23:20:32Z

Add architecture specific definitions and functions needed
by the architecture independent Hyper-V clocksource driver.
Update the Hyper-V clocksource driver to be initialized
on ARM64.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
---
arch/arm64/include/asm/mshyperv.h | 12 ++++++++++++
drivers/clocksource/hyperv_timer.c | 14 ++++++++++++++
2 files changed, 26 insertions(+)

diff --git a/arch/arm64/include/asm/mshyperv.h b/arch/arm64/include/asm/mshyperv.h
index 44ee012..d6ff2ee 100644
--- a/arch/arm64/include/asm/mshyperv.h
+++ b/arch/arm64/include/asm/mshyperv.h
@@ -21,6 +21,7 @@
#include <linux/types.h>
#include <linux/arm-smccc.h>
#include <asm/hyperv-tlfs.h>
+#include <clocksource/arm_arch_timer.h>

/*
* Declare calls to get and set Hyper-V VP register values on ARM64, which
@@ -42,6 +43,17 @@ static inline u64 hv_get_register(unsigned int reg)
return hv_get_vpreg(reg);
}

+/* Define the interrupt ID used by STIMER0 Direct Mode interrupts. This
+ * value can't come from ACPI tables because it is needed before the
+ * Linux ACPI subsystem is initialized.
+ */
+#define HYPERV_STIMER0_VECTOR 31
+
+static inline u64 hv_get_raw_timer(void)
+{
+ return arch_timer_read_counter();
+}
+
/* SMCCC hypercall parameters */
#define HV_SMCCC_FUNC_NUMBER 1
#define HV_FUNC_ID ARM_SMCCC_CALL_VAL( \
diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
index c553b8c..f8bb5df 100644
--- a/drivers/clocksource/hyperv_timer.c
+++ b/drivers/clocksource/hyperv_timer.c
@@ -567,3 +567,17 @@ void __init hv_init_clocksource(void)
hv_setup_sched_clock(read_hv_sched_clock_msr);
}
EXPORT_SYMBOL_GPL(hv_init_clocksource);
+
+/* Initialize everything on ARM64 */
+static int __init hyperv_timer_init(struct acpi_table_header *table)
+{
+ if (!hv_is_hyperv_initialized())
+ return -EINVAL;
+
+ hv_init_clocksource();
+ if (hv_stimer_alloc(true))
+ return -EINVAL;
+
+ return 0;
+}
+TIMER_ACPI_DECLARE(hyperv, ACPI_SIG_GTDT, hyperv_timer_init);
--
1.8.3.1