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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_EL0_TIMERS,
17 TIMER_HVTIMER = NR_KVM_EL0_TIMERS,
18 TIMER_HPTIMER,
19 NR_KVM_TIMERS
20};
21
22enum 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
30struct 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
43struct 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
53struct 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
78struct 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
85void get_timer_map(struct kvm_vcpu *vcpu, struct timer_map *map);
86
87struct 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
97int __init kvm_timer_hyp_init(bool has_gic);
98int kvm_timer_enable(struct kvm_vcpu *vcpu);
99void kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu);
100void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
101void kvm_timer_sync_user(struct kvm_vcpu *vcpu);
102bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu);
103void kvm_timer_update_run(struct kvm_vcpu *vcpu);
104void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
105
106void kvm_timer_init_vm(struct kvm *kvm);
107
108u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
109int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
110
111int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
112int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
113int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
114
115u64 kvm_phys_timer_read(void);
116
117void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);
118void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);
119
120void 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
134u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu,
135 enum kvm_arch_timers tmr,
136 enum kvm_arch_timer_regs treg);
137void 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 */
143u32 timer_get_ctl(struct arch_timer_context *ctxt);
144u64 timer_get_cval(struct arch_timer_context *ctxt);
145
146/* CPU HP callbacks */
147void kvm_timer_cpu_up(void);
148void kvm_timer_cpu_down(void);
149
150/* CNTKCTL_EL1 valid bits as of DDI0487J.a */
151#define CNTKCTL_VALID_BITS (BIT(17) | GENMASK_ULL(9, 0))
152
153static inline bool has_cntpoff(void)
154{
155 return (has_vhe() && cpus_have_final_cap(ARM64_HAS_ECV_CNTPOFF));
156}
157
158#endif
1/*
2 * Copyright (C) 2012 ARM Ltd.
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19#ifndef __ASM_ARM_KVM_ARCH_TIMER_H
20#define __ASM_ARM_KVM_ARCH_TIMER_H
21
22#include <linux/clocksource.h>
23#include <linux/hrtimer.h>
24#include <linux/workqueue.h>
25
26struct arch_timer_context {
27 /* Registers: control register, timer value */
28 u32 cnt_ctl;
29 u64 cnt_cval;
30
31 /* Timer IRQ */
32 struct kvm_irq_level irq;
33
34 /*
35 * We have multiple paths which can save/restore the timer state
36 * onto the hardware, so we need some way of keeping track of
37 * where the latest state is.
38 *
39 * loaded == true: State is loaded on the hardware registers.
40 * loaded == false: State is stored in memory.
41 */
42 bool loaded;
43
44 /* Virtual offset */
45 u64 cntvoff;
46};
47
48struct arch_timer_cpu {
49 struct arch_timer_context vtimer;
50 struct arch_timer_context ptimer;
51
52 /* Background timer used when the guest is not running */
53 struct hrtimer bg_timer;
54
55 /* Work queued with the above timer expires */
56 struct work_struct expired;
57
58 /* Physical timer emulation */
59 struct hrtimer phys_timer;
60
61 /* Is the timer enabled */
62 bool enabled;
63};
64
65int kvm_timer_hyp_init(bool);
66int kvm_timer_enable(struct kvm_vcpu *vcpu);
67int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu);
68void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
69void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);
70bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu);
71void kvm_timer_update_run(struct kvm_vcpu *vcpu);
72void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
73
74u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
75int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
76
77int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
78int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
79int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
80
81bool kvm_timer_is_pending(struct kvm_vcpu *vcpu);
82
83void kvm_timer_schedule(struct kvm_vcpu *vcpu);
84void kvm_timer_unschedule(struct kvm_vcpu *vcpu);
85
86u64 kvm_phys_timer_read(void);
87
88void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);
89void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);
90
91void kvm_timer_init_vhe(void);
92
93bool kvm_arch_timer_get_input_level(int vintid);
94
95#define vcpu_vtimer(v) (&(v)->arch.timer_cpu.vtimer)
96#define vcpu_ptimer(v) (&(v)->arch.timer_cpu.ptimer)
97
98#endif