LXR linux/include/kvm/arm_arch

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2012 ARM Ltd.
   4 * Author: Marc Zyngier <marc.zyngier@arm.com>
   5 */
   6
   7#ifndef __ASM_ARM_KVM_ARCH_TIMER_H
   8#define __ASM_ARM_KVM_ARCH_TIMER_H
   9
  10#include <linux/clocksource.h>
  11#include <linux/hrtimer.h>
  12
  13enum kvm_arch_timers {
  14        TIMER_PTIMER,
  15        TIMER_VTIMER,
  16        NR_KVM_TIMERS
  17};
  18
  19enum kvm_arch_timer_regs {
  20        TIMER_REG_CNT,
  21        TIMER_REG_CVAL,
  22        TIMER_REG_TVAL,
  23        TIMER_REG_CTL,
  24};
  25
  26struct arch_timer_context {
  27        struct kvm_vcpu                 *vcpu;
  28
  29        /* Registers: control register, timer value */
  30        u32                             cnt_ctl;
  31        u64                             cnt_cval;
  32
  33        /* Timer IRQ */
  34        struct kvm_irq_level            irq;
  35
  36        /* Virtual offset */
  37        u64                             cntvoff;
  38
  39        /* Emulated Timer (may be unused) */
  40        struct hrtimer                  hrtimer;
  41
  42        /*
  43         * We have multiple paths which can save/restore the timer state onto
  44         * the hardware, so we need some way of keeping track of where the
  45         * latest state is.
  46         */
  47        bool                            loaded;
  48
  49        /* Duplicated state from arch_timer.c for convenience */
  50        u32                             host_timer_irq;
  51        u32                             host_timer_irq_flags;
  52};
  53
  54struct timer_map {
  55        struct arch_timer_context *direct_vtimer;
  56        struct arch_timer_context *direct_ptimer;
  57        struct arch_timer_context *emul_ptimer;
  58};
  59
  60struct arch_timer_cpu {
  61        struct arch_timer_context timers[NR_KVM_TIMERS];
  62
  63        /* Background timer used when the guest is not running */
  64        struct hrtimer                  bg_timer;
  65
  66        /* Is the timer enabled */
  67        bool                    enabled;
  68};
  69
  70int kvm_timer_hyp_init(bool);
  71int kvm_timer_enable(struct kvm_vcpu *vcpu);
  72int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu);
  73void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
  74void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);
  75bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu);
  76void kvm_timer_update_run(struct kvm_vcpu *vcpu);
  77void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
  78
  79u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
  80int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
  81
  82int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
  83int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
  84int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
  85
  86bool kvm_timer_is_pending(struct kvm_vcpu *vcpu);
  87
  88u64 kvm_phys_timer_read(void);
  89
  90void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);
  91void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);
  92
  93void kvm_timer_init_vhe(void);
  94
  95bool kvm_arch_timer_get_input_level(int vintid);
  96
  97#define vcpu_timer(v)   (&(v)->arch.timer_cpu)
  98#define vcpu_get_timer(v,t)     (&vcpu_timer(v)->timers[(t)])
  99#define vcpu_vtimer(v)  (&(v)->arch.timer_cpu.timers[TIMER_VTIMER])
 100#define vcpu_ptimer(v)  (&(v)->arch.timer_cpu.timers[TIMER_PTIMER])
 101
 102#define arch_timer_ctx_index(ctx)       ((ctx) - vcpu_timer((ctx)->vcpu)->timers)
 103
 104u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu,
 105                              enum kvm_arch_timers tmr,
 106                              enum kvm_arch_timer_regs treg);
 107void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu,
 108                                enum kvm_arch_timers tmr,
 109                                enum kvm_arch_timer_regs treg,
 110                                u64 val);
 111
 112#endif
 113