[PATCH v8 2/6] arm64: hyperv: Add Hyper-V clocksource/clockevent support
From: Michael Kelley <hidden>
Date: 2021-02-18 23:19:45
Also in:
linux-efi, linux-hyperv, lkml
Subsystem:
arm64 port (aarch64 architecture), clocksource, clockevent drivers, hyper-v/azure core and drivers, the rest · Maintainers:
Catalin Marinas, Will Deacon, Daniel Lezcano, Thomas Gleixner, "K. Y. Srinivasan", Haiyang Zhang, Wei Liu, Dexuan Cui, Long Li, Linus Torvalds
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 <redacted> --- 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
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