summaryrefslogtreecommitdiff
path: root/include/kvm/arm_arch_timer.h
blob: c52a6e6839da9c8df41d50fa295f9ccc0871f14c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012 ARM Ltd.
 * Author: Marc Zyngier <marc.zyngier@arm.com>
 */

#ifndef __ASM_ARM_KVM_ARCH_TIMER_H
#define __ASM_ARM_KVM_ARCH_TIMER_H

#include <linux/clocksource.h>
#include <linux/hrtimer.h>

enum kvm_arch_timers {
	TIMER_PTIMER,
	TIMER_VTIMER,
	NR_KVM_TIMERS
};

enum kvm_arch_timer_regs {
	TIMER_REG_CNT,
	TIMER_REG_CVAL,
	TIMER_REG_TVAL,
	TIMER_REG_CTL,
};

struct arch_timer_offset {
	/*
	 * If set, pointer to one of the offsets in the kvm's offset
	 * structure. If NULL, assume a zero offset.
	 */
	u64	*vm_offset;
};

struct arch_timer_vm_data {
	/* Offset applied to the virtual timer/counter */
	u64	voffset;
};

struct arch_timer_context {
	struct kvm_vcpu			*vcpu;

	/* Timer IRQ */
	struct kvm_irq_level		irq;

	/* Emulated Timer (may be unused) */
	struct hrtimer			hrtimer;

	/* Offset for this counter/timer */
	struct arch_timer_offset	offset;
	/*
	 * We have multiple paths which can save/restore the timer state onto
	 * the hardware, so we need some way of keeping track of where the
	 * latest state is.
	 */
	bool				loaded;

	/* Duplicated state from arch_timer.c for convenience */
	u32				host_timer_irq;
	u32				host_timer_irq_flags;
};

struct timer_map {
	struct arch_timer_context *direct_vtimer;
	struct arch_timer_context *direct_ptimer;
	struct arch_timer_context *emul_ptimer;
};

struct arch_timer_cpu {
	struct arch_timer_context timers[NR_KVM_TIMERS];

	/* Background timer used when the guest is not running */
	struct hrtimer			bg_timer;

	/* Is the timer enabled */
	bool			enabled;
};

int __init kvm_timer_hyp_init(bool has_gic);
int kvm_timer_enable(struct kvm_vcpu *vcpu);
int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu);
void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
void kvm_timer_sync_user(struct kvm_vcpu *vcpu);
bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu);
void kvm_timer_update_run(struct kvm_vcpu *vcpu);
void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);

u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);

int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);

u64 kvm_phys_timer_read(void);

void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);
void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);

void kvm_timer_init_vhe(void);

bool kvm_arch_timer_get_input_level(int vintid);

#define vcpu_timer(v)	(&(v)->arch.timer_cpu)
#define vcpu_get_timer(v,t)	(&vcpu_timer(v)->timers[(t)])
#define vcpu_vtimer(v)	(&(v)->arch.timer_cpu.timers[TIMER_VTIMER])
#define vcpu_ptimer(v)	(&(v)->arch.timer_cpu.timers[TIMER_PTIMER])

#define arch_timer_ctx_index(ctx)	((ctx) - vcpu_timer((ctx)->vcpu)->timers)

u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu,
			      enum kvm_arch_timers tmr,
			      enum kvm_arch_timer_regs treg);
void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu,
				enum kvm_arch_timers tmr,
				enum kvm_arch_timer_regs treg,
				u64 val);

/* Needed for tracing */
u32 timer_get_ctl(struct arch_timer_context *ctxt);
u64 timer_get_cval(struct arch_timer_context *ctxt);

/* CPU HP callbacks */
void kvm_timer_cpu_up(void);
void kvm_timer_cpu_down(void);

#endif