tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
25enum kvm_arch_timers {
26 TIMER_PTIMER,
27 TIMER_VTIMER,
28 NR_KVM_TIMERS
29};
30
31enum kvm_arch_timer_regs {
32 TIMER_REG_CNT,
33 TIMER_REG_CVAL,
34 TIMER_REG_TVAL,
35 TIMER_REG_CTL,
36};
37
38struct arch_timer_context {
39 struct kvm_vcpu *vcpu;
40
41 /* Registers: control register, timer value */
42 u32 cnt_ctl;
43 u64 cnt_cval;
44
45 /* Timer IRQ */
46 struct kvm_irq_level irq;
47
48 /* Virtual offset */
49 u64 cntvoff;
50
51 /* Emulated Timer (may be unused) */
52 struct hrtimer hrtimer;
53
54 /*
55 * We have multiple paths which can save/restore the timer state onto
56 * the hardware, so we need some way of keeping track of where the
57 * latest state is.
58 */
59 bool loaded;
60
61 /* Duplicated state from arch_timer.c for convenience */
62 u32 host_timer_irq;
63 u32 host_timer_irq_flags;
64};
65
66struct timer_map {
67 struct arch_timer_context *direct_vtimer;
68 struct arch_timer_context *direct_ptimer;
69 struct arch_timer_context *emul_ptimer;
70};
71
72struct arch_timer_cpu {
73 struct arch_timer_context timers[NR_KVM_TIMERS];
74
75 /* Background timer used when the guest is not running */
76 struct hrtimer bg_timer;
77
78 /* Is the timer enabled */
79 bool enabled;
80};
81
82int kvm_timer_hyp_init(bool);
83int kvm_timer_enable(struct kvm_vcpu *vcpu);
84int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu);
85void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
86void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);
87bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu);
88void kvm_timer_update_run(struct kvm_vcpu *vcpu);
89void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
90
91u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
92int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
93
94int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
95int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
96int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
97
98bool kvm_timer_is_pending(struct kvm_vcpu *vcpu);
99
100u64 kvm_phys_timer_read(void);
101
102void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);
103void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);
104
105void kvm_timer_init_vhe(void);
106
107bool kvm_arch_timer_get_input_level(int vintid);
108
109#define vcpu_timer(v) (&(v)->arch.timer_cpu)
110#define vcpu_get_timer(v,t) (&vcpu_timer(v)->timers[(t)])
111#define vcpu_vtimer(v) (&(v)->arch.timer_cpu.timers[TIMER_VTIMER])
112#define vcpu_ptimer(v) (&(v)->arch.timer_cpu.timers[TIMER_PTIMER])
113
114#define arch_timer_ctx_index(ctx) ((ctx) - vcpu_timer((ctx)->vcpu)->timers)
115
116u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu,
117 enum kvm_arch_timers tmr,
118 enum kvm_arch_timer_regs treg);
119void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu,
120 enum kvm_arch_timers tmr,
121 enum kvm_arch_timer_regs treg,
122 u64 val);
123
124#endif