include/kvm/arm_arch_timer.h

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   3  * Author: Marc Zyngier <marc.zyngier@arm.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17  */
  18
  19 #ifndef __ASM_ARM_KVM_ARCH_TIMER_H
  20 #define __ASM_ARM_KVM_ARCH_TIMER_H
  21
  22 #include <linux/clocksource.h>
  23 #include <linux/hrtimer.h>
  24
  25 struct arch_timer_context {
  26         /* Registers: control register, timer value */
  27         u32                             cnt_ctl;
  28         u64                             cnt_cval;
  29
  30         /* Timer IRQ */
  31         struct kvm_irq_level            irq;
  32
  33         /*
  34          * We have multiple paths which can save/restore the timer state
  35          * onto the hardware, so we need some way of keeping track of
  36          * where the latest state is.
  37          *
  38          * loaded == true:  State is loaded on the hardware registers.
  39          * loaded == false: State is stored in memory.
  40          */
  41         bool                    loaded;
  42
  43         /* Virtual offset */
  44         u64                     cntvoff;
  45 };
  46
  47 struct arch_timer_cpu {
  48         struct arch_timer_context       vtimer;
  49         struct arch_timer_context       ptimer;
  50
  51         /* Background timer used when the guest is not running */
  52         struct hrtimer                  bg_timer;
  53
  54         /* Physical timer emulation */
  55         struct hrtimer                  phys_timer;
  56
  57         /* Is the timer enabled */
  58         bool                    enabled;
  59 };
  60
  61 int kvm_timer_hyp_init(bool);
  62 int kvm_timer_enable(struct kvm_vcpu *vcpu);
  63 int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu);
  64 void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
  65 void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);
  66 bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu);
  67 void kvm_timer_update_run(struct kvm_vcpu *vcpu);
  68 void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
  69
  70 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
  71 int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
  72
  73 int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
  74 int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
  75 int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
  76
  77 bool kvm_timer_is_pending(struct kvm_vcpu *vcpu);
  78
  79 void kvm_timer_schedule(struct kvm_vcpu *vcpu);
  80 void kvm_timer_unschedule(struct kvm_vcpu *vcpu);
  81
  82 u64 kvm_phys_timer_read(void);
  83
  84 void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);
  85 void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);
  86
  87 void kvm_timer_init_vhe(void);
  88
  89 bool kvm_arch_timer_get_input_level(int vintid);
  90
  91 #define vcpu_vtimer(v)  (&(v)->arch.timer_cpu.vtimer)
  92 #define vcpu_ptimer(v)  (&(v)->arch.timer_cpu.ptimer)
  93
  94 #endif