Linux kernel mirror (for testing)
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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