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 
13 enum kvm_arch_timers {
14 	TIMER_PTIMER,
15 	TIMER_VTIMER,
16 	NR_KVM_EL0_TIMERS,
17 	TIMER_HVTIMER = NR_KVM_EL0_TIMERS,
18 	TIMER_HPTIMER,
19 	NR_KVM_TIMERS
20 };
21 
22 enum kvm_arch_timer_regs {
23 	TIMER_REG_CNT,
24 	TIMER_REG_CVAL,
25 	TIMER_REG_TVAL,
26 	TIMER_REG_CTL,
27 	TIMER_REG_VOFF,
28 };
29 
30 struct arch_timer_offset {
31 	/*
32 	 * If set, pointer to one of the offsets in the kvm's offset
33 	 * structure. If NULL, assume a zero offset.
34 	 */
35 	u64	*vm_offset;
36 	/*
37 	 * If set, pointer to one of the offsets in the vcpu's sysreg
38 	 * array. If NULL, assume a zero offset.
39 	 */
40 	u64	*vcpu_offset;
41 };
42 
43 struct arch_timer_vm_data {
44 	/* Offset applied to the virtual timer/counter */
45 	u64	voffset;
46 	/* Offset applied to the physical timer/counter */
47 	u64	poffset;
48 
49 	/* The PPI for each timer, global to the VM */
50 	u8	ppi[NR_KVM_TIMERS];
51 };
52 
53 struct arch_timer_context {
54 	struct kvm_vcpu			*vcpu;
55 
56 	/* Emulated Timer (may be unused) */
57 	struct hrtimer			hrtimer;
58 	u64				ns_frac;
59 
60 	/* Offset for this counter/timer */
61 	struct arch_timer_offset	offset;
62 	/*
63 	 * We have multiple paths which can save/restore the timer state onto
64 	 * the hardware, so we need some way of keeping track of where the
65 	 * latest state is.
66 	 */
67 	bool				loaded;
68 
69 	/* Output level of the timer IRQ */
70 	struct {
71 		bool			level;
72 	} irq;
73 
74 	/* Duplicated state from arch_timer.c for convenience */
75 	u32				host_timer_irq;
76 };
77 
78 struct timer_map {
79 	struct arch_timer_context *direct_vtimer;
80 	struct arch_timer_context *direct_ptimer;
81 	struct arch_timer_context *emul_vtimer;
82 	struct arch_timer_context *emul_ptimer;
83 };
84 
85 void get_timer_map(struct kvm_vcpu *vcpu, struct timer_map *map);
86 
87 struct arch_timer_cpu {
88 	struct arch_timer_context timers[NR_KVM_TIMERS];
89 
90 	/* Background timer used when the guest is not running */
91 	struct hrtimer			bg_timer;
92 
93 	/* Is the timer enabled */
94 	bool			enabled;
95 };
96 
97 int __init kvm_timer_hyp_init(bool has_gic);
98 int kvm_timer_enable(struct kvm_vcpu *vcpu);
99 int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu);
100 void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
101 void kvm_timer_sync_user(struct kvm_vcpu *vcpu);
102 bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu);
103 void kvm_timer_update_run(struct kvm_vcpu *vcpu);
104 void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
105 
106 void kvm_timer_init_vm(struct kvm *kvm);
107 
108 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
109 int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
110 
111 int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
112 int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
113 int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
114 
115 u64 kvm_phys_timer_read(void);
116 
117 void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);
118 void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);
119 
120 void kvm_timer_init_vhe(void);
121 
122 #define vcpu_timer(v)	(&(v)->arch.timer_cpu)
123 #define vcpu_get_timer(v,t)	(&vcpu_timer(v)->timers[(t)])
124 #define vcpu_vtimer(v)	(&(v)->arch.timer_cpu.timers[TIMER_VTIMER])
125 #define vcpu_ptimer(v)	(&(v)->arch.timer_cpu.timers[TIMER_PTIMER])
126 #define vcpu_hvtimer(v)	(&(v)->arch.timer_cpu.timers[TIMER_HVTIMER])
127 #define vcpu_hptimer(v)	(&(v)->arch.timer_cpu.timers[TIMER_HPTIMER])
128 
129 #define arch_timer_ctx_index(ctx)	((ctx) - vcpu_timer((ctx)->vcpu)->timers)
130 
131 #define timer_vm_data(ctx)		(&(ctx)->vcpu->kvm->arch.timer_data)
132 #define timer_irq(ctx)			(timer_vm_data(ctx)->ppi[arch_timer_ctx_index(ctx)])
133 
134 u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu,
135 			      enum kvm_arch_timers tmr,
136 			      enum kvm_arch_timer_regs treg);
137 void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu,
138 				enum kvm_arch_timers tmr,
139 				enum kvm_arch_timer_regs treg,
140 				u64 val);
141 
142 /* Needed for tracing */
143 u32 timer_get_ctl(struct arch_timer_context *ctxt);
144 u64 timer_get_cval(struct arch_timer_context *ctxt);
145 
146 /* CPU HP callbacks */
147 void kvm_timer_cpu_up(void);
148 void kvm_timer_cpu_down(void);
149 
has_cntpoff(void)150 static inline bool has_cntpoff(void)
151 {
152 	return (has_vhe() && cpus_have_final_cap(ARM64_HAS_ECV_CNTPOFF));
153 }
154 
155 #endif
156