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_offset { 27 /* 28 * If set, pointer to one of the offsets in the kvm's offset 29 * structure. If NULL, assume a zero offset. 30 */ 31 u64 *vm_offset; 32 }; 33 34 struct arch_timer_vm_data { 35 /* Offset applied to the virtual timer/counter */ 36 u64 voffset; 37 }; 38 39 struct arch_timer_context { 40 struct kvm_vcpu *vcpu; 41 42 /* Timer IRQ */ 43 struct kvm_irq_level irq; 44 45 /* Emulated Timer (may be unused) */ 46 struct hrtimer hrtimer; 47 48 /* Offset for this counter/timer */ 49 struct arch_timer_offset offset; 50 /* 51 * We have multiple paths which can save/restore the timer state onto 52 * the hardware, so we need some way of keeping track of where the 53 * latest state is. 54 */ 55 bool loaded; 56 57 /* Duplicated state from arch_timer.c for convenience */ 58 u32 host_timer_irq; 59 u32 host_timer_irq_flags; 60 }; 61 62 struct timer_map { 63 struct arch_timer_context *direct_vtimer; 64 struct arch_timer_context *direct_ptimer; 65 struct arch_timer_context *emul_ptimer; 66 }; 67 68 struct arch_timer_cpu { 69 struct arch_timer_context timers[NR_KVM_TIMERS]; 70 71 /* Background timer used when the guest is not running */ 72 struct hrtimer bg_timer; 73 74 /* Is the timer enabled */ 75 bool enabled; 76 }; 77 78 int __init kvm_timer_hyp_init(bool has_gic); 79 int kvm_timer_enable(struct kvm_vcpu *vcpu); 80 int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu); 81 void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu); 82 void kvm_timer_sync_user(struct kvm_vcpu *vcpu); 83 bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu); 84 void kvm_timer_update_run(struct kvm_vcpu *vcpu); 85 void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu); 86 87 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid); 88 int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value); 89 90 int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 91 int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 92 int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 93 94 u64 kvm_phys_timer_read(void); 95 96 void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu); 97 void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu); 98 99 void kvm_timer_init_vhe(void); 100 101 bool kvm_arch_timer_get_input_level(int vintid); 102 103 #define vcpu_timer(v) (&(v)->arch.timer_cpu) 104 #define vcpu_get_timer(v,t) (&vcpu_timer(v)->timers[(t)]) 105 #define vcpu_vtimer(v) (&(v)->arch.timer_cpu.timers[TIMER_VTIMER]) 106 #define vcpu_ptimer(v) (&(v)->arch.timer_cpu.timers[TIMER_PTIMER]) 107 108 #define arch_timer_ctx_index(ctx) ((ctx) - vcpu_timer((ctx)->vcpu)->timers) 109 110 u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu, 111 enum kvm_arch_timers tmr, 112 enum kvm_arch_timer_regs treg); 113 void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu, 114 enum kvm_arch_timers tmr, 115 enum kvm_arch_timer_regs treg, 116 u64 val); 117 118 /* Needed for tracing */ 119 u32 timer_get_ctl(struct arch_timer_context *ctxt); 120 u64 timer_get_cval(struct arch_timer_context *ctxt); 121 122 /* CPU HP callbacks */ 123 void kvm_timer_cpu_up(void); 124 void kvm_timer_cpu_down(void); 125 126 #endif 127