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_TIMERS 17 }; 18 19 enum kvm_arch_timer_regs { 20 TIMER_REG_CNT, 21 TIMER_REG_CVAL, 22 TIMER_REG_TVAL, 23 TIMER_REG_CTL, 24 }; 25 26 struct arch_timer_context { 27 struct kvm_vcpu *vcpu; 28 29 /* Registers: control register, timer value */ 30 u32 cnt_ctl; 31 u64 cnt_cval; 32 33 /* Timer IRQ */ 34 struct kvm_irq_level irq; 35 36 /* Virtual offset */ 37 u64 cntvoff; 38 39 /* Emulated Timer (may be unused) */ 40 struct hrtimer hrtimer; 41 42 /* 43 * We have multiple paths which can save/restore the timer state onto 44 * the hardware, so we need some way of keeping track of where the 45 * latest state is. 46 */ 47 bool loaded; 48 49 /* Duplicated state from arch_timer.c for convenience */ 50 u32 host_timer_irq; 51 u32 host_timer_irq_flags; 52 }; 53 54 struct timer_map { 55 struct arch_timer_context *direct_vtimer; 56 struct arch_timer_context *direct_ptimer; 57 struct arch_timer_context *emul_ptimer; 58 }; 59 60 struct arch_timer_cpu { 61 struct arch_timer_context timers[NR_KVM_TIMERS]; 62 63 /* Background timer used when the guest is not running */ 64 struct hrtimer bg_timer; 65 66 /* Is the timer enabled */ 67 bool enabled; 68 }; 69 70 int kvm_timer_hyp_init(bool); 71 int kvm_timer_enable(struct kvm_vcpu *vcpu); 72 int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu); 73 void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu); 74 void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu); 75 bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu); 76 void kvm_timer_update_run(struct kvm_vcpu *vcpu); 77 void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu); 78 79 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid); 80 int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value); 81 82 int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 83 int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 84 int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 85 86 bool kvm_timer_is_pending(struct kvm_vcpu *vcpu); 87 88 u64 kvm_phys_timer_read(void); 89 90 void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu); 91 void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu); 92 93 void kvm_timer_init_vhe(void); 94 95 bool kvm_arch_timer_get_input_level(int vintid); 96 97 #define vcpu_timer(v) (&(v)->arch.timer_cpu) 98 #define vcpu_get_timer(v,t) (&vcpu_timer(v)->timers[(t)]) 99 #define vcpu_vtimer(v) (&(v)->arch.timer_cpu.timers[TIMER_VTIMER]) 100 #define vcpu_ptimer(v) (&(v)->arch.timer_cpu.timers[TIMER_PTIMER]) 101 102 #define arch_timer_ctx_index(ctx) ((ctx) - vcpu_timer((ctx)->vcpu)->timers) 103 104 u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu, 105 enum kvm_arch_timers tmr, 106 enum kvm_arch_timer_regs treg); 107 void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu, 108 enum kvm_arch_timers tmr, 109 enum kvm_arch_timer_regs treg, 110 u64 val); 111 112 #endif 113