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 #include <linux/workqueue.h>
  25
  26 struct arch_timer_context {
  27         /* Registers: control register, timer value */
  28         u32                             cnt_ctl;
  29         u64                             cnt_cval;
  30
  31         /* Timer IRQ */
  32         struct kvm_irq_level            irq;
  33
  34         /*
  35          * We have multiple paths which can save/restore the timer state
  36          * onto the hardware, so we need some way of keeping track of
  37          * where the latest state is.
  38          *
  39          * loaded == true:  State is loaded on the hardware registers.
  40          * loaded == false: State is stored in memory.
  41          */
  42         bool                    loaded;
  43
  44         /* Virtual offset */
  45         u64                     cntvoff;
  46 };
  47
  48 struct arch_timer_cpu {
  49         struct arch_timer_context       vtimer;
  50         struct arch_timer_context       ptimer;
  51
  52         /* Background timer used when the guest is not running */
  53         struct hrtimer                  bg_timer;
  54
  55         /* Work queued with the above timer expires */
  56         struct work_struct              expired;
  57
  58         /* Physical timer emulation */
  59         struct hrtimer                  phys_timer;
  60
  61         /* Is the timer enabled */
  62         bool                    enabled;
  63 };
  64
  65 int kvm_timer_hyp_init(bool);
  66 int kvm_timer_enable(struct kvm_vcpu *vcpu);
  67 int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu);
  68 void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
  69 void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);
  70 bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu);
  71 void kvm_timer_update_run(struct kvm_vcpu *vcpu);
  72 void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
  73
  74 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
  75 int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
  76
  77 int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
  78 int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
  79 int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
  80
  81 bool kvm_timer_is_pending(struct kvm_vcpu *vcpu);
  82
  83 void kvm_timer_schedule(struct kvm_vcpu *vcpu);
  84 void kvm_timer_unschedule(struct kvm_vcpu *vcpu);
  85
  86 u64 kvm_phys_timer_read(void);
  87
  88 void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);
  89 void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);
  90
  91 void kvm_timer_init_vhe(void);
  92
  93 #define vcpu_vtimer(v)  (&(v)->arch.timer_cpu.vtimer)
  94 #define vcpu_ptimer(v)  (&(v)->arch.timer_cpu.ptimer)
  95
  96 #endif