Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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#include <linux/irqchip/arm-gic-v5.h>
14
15enum kvm_arch_timers {
16 TIMER_PTIMER,
17 TIMER_VTIMER,
18 NR_KVM_EL0_TIMERS,
19 TIMER_HVTIMER = NR_KVM_EL0_TIMERS,
20 TIMER_HPTIMER,
21 NR_KVM_TIMERS
22};
23
24enum kvm_arch_timer_regs {
25 TIMER_REG_CNT,
26 TIMER_REG_CVAL,
27 TIMER_REG_TVAL,
28 TIMER_REG_CTL,
29 TIMER_REG_VOFF,
30};
31
32struct arch_timer_offset {
33 /*
34 * If set, pointer to one of the offsets in the kvm's offset
35 * structure. If NULL, assume a zero offset.
36 */
37 u64 *vm_offset;
38 /*
39 * If set, pointer to one of the offsets in the vcpu's sysreg
40 * array. If NULL, assume a zero offset.
41 */
42 u64 *vcpu_offset;
43};
44
45struct arch_timer_vm_data {
46 /* Offset applied to the virtual timer/counter */
47 u64 voffset;
48 /* Offset applied to the physical timer/counter */
49 u64 poffset;
50
51 /* The PPI for each timer, global to the VM */
52 u32 ppi[NR_KVM_TIMERS];
53};
54
55struct arch_timer_context {
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 /* Who am I? */
75 enum kvm_arch_timers timer_id;
76
77 /* Duplicated state from arch_timer.c for convenience */
78 u32 host_timer_irq;
79};
80
81struct timer_map {
82 struct arch_timer_context *direct_vtimer;
83 struct arch_timer_context *direct_ptimer;
84 struct arch_timer_context *emul_vtimer;
85 struct arch_timer_context *emul_ptimer;
86};
87
88void get_timer_map(struct kvm_vcpu *vcpu, struct timer_map *map);
89
90struct arch_timer_cpu {
91 struct arch_timer_context timers[NR_KVM_TIMERS];
92
93 /* Background timer used when the guest is not running */
94 struct hrtimer bg_timer;
95
96 /* Is the timer enabled */
97 bool enabled;
98};
99
100int __init kvm_timer_hyp_init(bool has_gic);
101int kvm_timer_enable(struct kvm_vcpu *vcpu);
102void kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu);
103void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
104void kvm_timer_sync_nested(struct kvm_vcpu *vcpu);
105void kvm_timer_sync_user(struct kvm_vcpu *vcpu);
106bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu);
107void kvm_timer_update_run(struct kvm_vcpu *vcpu);
108void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
109
110void kvm_timer_init_vm(struct kvm *kvm);
111
112int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
113int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
114int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
115
116u64 kvm_phys_timer_read(void);
117
118void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);
119void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);
120
121void kvm_timer_init_vhe(void);
122
123#define vcpu_timer(v) (&(v)->arch.timer_cpu)
124#define vcpu_get_timer(v,t) (&vcpu_timer(v)->timers[(t)])
125#define vcpu_vtimer(v) (&(v)->arch.timer_cpu.timers[TIMER_VTIMER])
126#define vcpu_ptimer(v) (&(v)->arch.timer_cpu.timers[TIMER_PTIMER])
127#define vcpu_hvtimer(v) (&(v)->arch.timer_cpu.timers[TIMER_HVTIMER])
128#define vcpu_hptimer(v) (&(v)->arch.timer_cpu.timers[TIMER_HPTIMER])
129
130#define arch_timer_ctx_index(ctx) ((ctx)->timer_id)
131#define timer_context_to_vcpu(ctx) container_of((ctx), struct kvm_vcpu, arch.timer_cpu.timers[(ctx)->timer_id])
132#define timer_vm_data(ctx) (&(timer_context_to_vcpu(ctx)->kvm->arch.timer_data))
133#define timer_irq(ctx) (timer_vm_data(ctx)->ppi[arch_timer_ctx_index(ctx)])
134
135#define get_vgic_ppi(k, i) (((k)->arch.vgic.vgic_model != KVM_DEV_TYPE_ARM_VGIC_V5) ? \
136 (i) : (FIELD_PREP(GICV5_HWIRQ_ID, i) | \
137 FIELD_PREP(GICV5_HWIRQ_TYPE, GICV5_HWIRQ_TYPE_PPI)))
138
139u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu,
140 enum kvm_arch_timers tmr,
141 enum kvm_arch_timer_regs treg);
142void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu,
143 enum kvm_arch_timers tmr,
144 enum kvm_arch_timer_regs treg,
145 u64 val);
146
147/* Needed for tracing */
148u32 timer_get_ctl(struct arch_timer_context *ctxt);
149u64 timer_get_cval(struct arch_timer_context *ctxt);
150
151/* CPU HP callbacks */
152void kvm_timer_cpu_up(void);
153void kvm_timer_cpu_down(void);
154
155/* CNTKCTL_EL1 valid bits as of DDI0487J.a */
156#define CNTKCTL_VALID_BITS (BIT(17) | GENMASK_ULL(9, 0))
157
158DECLARE_STATIC_KEY_FALSE(broken_cntvoff_key);
159
160static inline bool has_broken_cntvoff(void)
161{
162 return static_branch_unlikely(&broken_cntvoff_key);
163}
164
165static inline bool has_cntpoff(void)
166{
167 return (has_vhe() && cpus_have_final_cap(ARM64_HAS_ECV_CNTPOFF));
168}
169
170static inline u64 timer_get_offset(struct arch_timer_context *ctxt)
171{
172 u64 offset = 0;
173
174 if (!ctxt)
175 return 0;
176
177 if (ctxt->offset.vm_offset)
178 offset += *ctxt->offset.vm_offset;
179 if (ctxt->offset.vcpu_offset)
180 offset += *ctxt->offset.vcpu_offset;
181
182 return offset;
183}
184
185static inline void timer_set_offset(struct arch_timer_context *ctxt, u64 offset)
186{
187 if (!ctxt->offset.vm_offset) {
188 WARN(offset, "timer %d\n", arch_timer_ctx_index(ctxt));
189 return;
190 }
191
192 WRITE_ONCE(*ctxt->offset.vm_offset, offset);
193}
194
195#endif