drivers/ptp/ptp_kvm_arm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Virtual PTP 1588 clock for use with KVM guests
   4  *  Copyright (C) 2019 ARM Ltd.
   5  *  All Rights Reserved
   6  */
   7
   8 #include <linux/arm-smccc.h>
   9 #include <linux/ptp_kvm.h>
  10
  11 #include <asm/arch_timer.h>
  12 #include <asm/hypervisor.h>
  13
  14 int kvm_arch_ptp_init(void)
  15 {
  16         int ret;
  17
  18         ret = kvm_arm_hyp_service_available(ARM_SMCCC_KVM_FUNC_PTP);
  19         if (ret <= 0)
  20                 return -EOPNOTSUPP;
  21
  22         return 0;
  23 }
  24
  25 void kvm_arch_ptp_exit(void)
  26 {
  27 }
  28
  29 int kvm_arch_ptp_get_clock(struct timespec64 *ts)
  30 {
  31         return kvm_arch_ptp_get_crosststamp(NULL, ts, NULL);
  32 }