diff options
| -rw-r--r-- | drivers/clocksource/arm_arch_timer.c | 34 | ||||
| -rw-r--r-- | drivers/ptp/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/ptp/Makefile | 1 | ||||
| -rw-r--r-- | drivers/ptp/ptp_kvm_arm.c | 28 |
4 files changed, 64 insertions, 1 deletions
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 8f12e223703f..e0f167e5e792 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -25,6 +25,8 @@ #include <linux/sched/clock.h> #include <linux/sched_clock.h> #include <linux/acpi.h> +#include <linux/arm-smccc.h> +#include <linux/ptp_kvm.h> #include <asm/arch_timer.h> #include <asm/virt.h> @@ -1659,3 +1661,35 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table) } TIMER_ACPI_DECLARE(arch_timer, ACPI_SIG_GTDT, arch_timer_acpi_init); #endif + +int kvm_arch_ptp_get_crosststamp(u64 *cycle, struct timespec64 *ts, + struct clocksource **cs) +{ + struct arm_smccc_res hvc_res; + u32 ptp_counter; + ktime_t ktime; + + if (!IS_ENABLED(CONFIG_HAVE_ARM_SMCCC_DISCOVERY)) + return -EOPNOTSUPP; + + if (arch_timer_uses_ppi == ARCH_TIMER_VIRT_PPI) + ptp_counter = KVM_PTP_VIRT_COUNTER; + else + ptp_counter = KVM_PTP_PHYS_COUNTER; + + arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID, + ptp_counter, &hvc_res); + + if ((int)(hvc_res.a0) < 0) + return -EOPNOTSUPP; + + ktime = (u64)hvc_res.a0 << 32 | hvc_res.a1; + *ts = ktime_to_timespec64(ktime); + if (cycle) + *cycle = (u64)hvc_res.a2 << 32 | hvc_res.a3; + if (cs) + *cs = &clocksource_counter; + + return 0; +} +EXPORT_SYMBOL_GPL(kvm_arch_ptp_get_crosststamp); diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig index f2edef0df40f..8c20e524e9ad 100644 --- a/drivers/ptp/Kconfig +++ b/drivers/ptp/Kconfig @@ -108,7 +108,7 @@ config PTP_1588_CLOCK_PCH config PTP_1588_CLOCK_KVM tristate "KVM virtual PTP clock" depends on PTP_1588_CLOCK - depends on KVM_GUEST && X86 + depends on (KVM_GUEST && X86) || (HAVE_ARM_SMCCC_DISCOVERY && ARM_ARCH_TIMER) default y help This driver adds support for using kvm infrastructure as a PTP diff --git a/drivers/ptp/Makefile b/drivers/ptp/Makefile index d11eeb5811d1..8673d1743faa 100644 --- a/drivers/ptp/Makefile +++ b/drivers/ptp/Makefile @@ -5,6 +5,7 @@ ptp-y := ptp_clock.o ptp_chardev.o ptp_sysfs.o ptp_kvm-$(CONFIG_X86) := ptp_kvm_x86.o ptp_kvm_common.o +ptp_kvm-$(CONFIG_HAVE_ARM_SMCCC) := ptp_kvm_arm.o ptp_kvm_common.o obj-$(CONFIG_PTP_1588_CLOCK) += ptp.o obj-$(CONFIG_PTP_1588_CLOCK_DTE) += ptp_dte.o obj-$(CONFIG_PTP_1588_CLOCK_INES) += ptp_ines.o diff --git a/drivers/ptp/ptp_kvm_arm.c b/drivers/ptp/ptp_kvm_arm.c new file mode 100644 index 000000000000..b7d28c8dfb84 --- /dev/null +++ b/drivers/ptp/ptp_kvm_arm.c @@ -0,0 +1,28 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Virtual PTP 1588 clock for use with KVM guests + * Copyright (C) 2019 ARM Ltd. + * All Rights Reserved + */ + +#include <linux/arm-smccc.h> +#include <linux/ptp_kvm.h> + +#include <asm/arch_timer.h> +#include <asm/hypervisor.h> + +int kvm_arch_ptp_init(void) +{ + int ret; + + ret = kvm_arm_hyp_service_available(ARM_SMCCC_KVM_FUNC_PTP); + if (ret <= 0) + return -EOPNOTSUPP; + + return 0; +} + +int kvm_arch_ptp_get_clock(struct timespec64 *ts) +{ + return kvm_arch_ptp_get_crosststamp(NULL, ts, NULL); +} |