LXR linux/include/kvm/arm_arch

   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
  26struct 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
  48struct 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
  65int kvm_timer_hyp_init(bool);
  66int kvm_timer_enable(struct kvm_vcpu *vcpu);
  67int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu);
  68void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
  69void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);
  70bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu);
  71void kvm_timer_update_run(struct kvm_vcpu *vcpu);
  72void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
  73
  74u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
  75int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
  76
  77int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
  78int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
  79int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
  80
  81bool kvm_timer_is_pending(struct kvm_vcpu *vcpu);
  82
  83void kvm_timer_schedule(struct kvm_vcpu *vcpu);
  84void kvm_timer_unschedule(struct kvm_vcpu *vcpu);
  85
  86u64 kvm_phys_timer_read(void);
  87
  88void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);
  89void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);
  90
  91void kvm_timer_init_vhe(void);
  92
  93bool kvm_arch_timer_get_input_level(int vintid);
  94
  95#define vcpu_vtimer(v)  (&(v)->arch.timer_cpu.vtimer)
  96#define vcpu_ptimer(v)  (&(v)->arch.timer_cpu.ptimer)
  97
  98#endif
  99