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