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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_offset {
27 /*
28 * If set, pointer to one of the offsets in the kvm's offset
29 * structure. If NULL, assume a zero offset.
30 */
31 u64 *vm_offset;
32};
33
34struct arch_timer_vm_data {
35 /* Offset applied to the virtual timer/counter */
36 u64 voffset;
37};
38
39struct arch_timer_context {
40 struct kvm_vcpu *vcpu;
41
42 /* Timer IRQ */
43 struct kvm_irq_level irq;
44
45 /* Emulated Timer (may be unused) */
46 struct hrtimer hrtimer;
47
48 /* Offset for this counter/timer */
49 struct arch_timer_offset offset;
50 /*
51 * We have multiple paths which can save/restore the timer state onto
52 * the hardware, so we need some way of keeping track of where the
53 * latest state is.
54 */
55 bool loaded;
56
57 /* Duplicated state from arch_timer.c for convenience */
58 u32 host_timer_irq;
59 u32 host_timer_irq_flags;
60};
61
62struct timer_map {
63 struct arch_timer_context *direct_vtimer;
64 struct arch_timer_context *direct_ptimer;
65 struct arch_timer_context *emul_ptimer;
66};
67
68struct arch_timer_cpu {
69 struct arch_timer_context timers[NR_KVM_TIMERS];
70
71 /* Background timer used when the guest is not running */
72 struct hrtimer bg_timer;
73
74 /* Is the timer enabled */
75 bool enabled;
76};
77
78int __init kvm_timer_hyp_init(bool has_gic);
79int kvm_timer_enable(struct kvm_vcpu *vcpu);
80int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu);
81void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
82void kvm_timer_sync_user(struct kvm_vcpu *vcpu);
83bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu);
84void kvm_timer_update_run(struct kvm_vcpu *vcpu);
85void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
86
87u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
88int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
89
90int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
91int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
92int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
93
94u64 kvm_phys_timer_read(void);
95
96void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);
97void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);
98
99void kvm_timer_init_vhe(void);
100
101bool kvm_arch_timer_get_input_level(int vintid);
102
103#define vcpu_timer(v) (&(v)->arch.timer_cpu)
104#define vcpu_get_timer(v,t) (&vcpu_timer(v)->timers[(t)])
105#define vcpu_vtimer(v) (&(v)->arch.timer_cpu.timers[TIMER_VTIMER])
106#define vcpu_ptimer(v) (&(v)->arch.timer_cpu.timers[TIMER_PTIMER])
107
108#define arch_timer_ctx_index(ctx) ((ctx) - vcpu_timer((ctx)->vcpu)->timers)
109
110u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu,
111 enum kvm_arch_timers tmr,
112 enum kvm_arch_timer_regs treg);
113void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu,
114 enum kvm_arch_timers tmr,
115 enum kvm_arch_timer_regs treg,
116 u64 val);
117
118/* Needed for tracing */
119u32 timer_get_ctl(struct arch_timer_context *ctxt);
120u64 timer_get_cval(struct arch_timer_context *ctxt);
121
122/* CPU HP callbacks */
123void kvm_timer_cpu_up(void);
124void kvm_timer_cpu_down(void);
125
126#endif