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_EL0_TIMERS, 17 TIMER_HVTIMER = NR_KVM_EL0_TIMERS, 18 TIMER_HPTIMER, 19 NR_KVM_TIMERS 20 }; 21 22 enum kvm_arch_timer_regs { 23 TIMER_REG_CNT, 24 TIMER_REG_CVAL, 25 TIMER_REG_TVAL, 26 TIMER_REG_CTL, 27 TIMER_REG_VOFF, 28 }; 29 30 struct arch_timer_offset { 31 /* 32 * If set, pointer to one of the offsets in the kvm's offset 33 * structure. If NULL, assume a zero offset. 34 */ 35 u64 *vm_offset; 36 /* 37 * If set, pointer to one of the offsets in the vcpu's sysreg 38 * array. If NULL, assume a zero offset. 39 */ 40 u64 *vcpu_offset; 41 }; 42 43 struct arch_timer_vm_data { 44 /* Offset applied to the virtual timer/counter */ 45 u64 voffset; 46 /* Offset applied to the physical timer/counter */ 47 u64 poffset; 48 49 /* The PPI for each timer, global to the VM */ 50 u8 ppi[NR_KVM_TIMERS]; 51 }; 52 53 struct arch_timer_context { 54 struct kvm_vcpu *vcpu; 55 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 /* Duplicated state from arch_timer.c for convenience */ 75 u32 host_timer_irq; 76 }; 77 78 struct timer_map { 79 struct arch_timer_context *direct_vtimer; 80 struct arch_timer_context *direct_ptimer; 81 struct arch_timer_context *emul_vtimer; 82 struct arch_timer_context *emul_ptimer; 83 }; 84 85 void get_timer_map(struct kvm_vcpu *vcpu, struct timer_map *map); 86 87 struct arch_timer_cpu { 88 struct arch_timer_context timers[NR_KVM_TIMERS]; 89 90 /* Background timer used when the guest is not running */ 91 struct hrtimer bg_timer; 92 93 /* Is the timer enabled */ 94 bool enabled; 95 }; 96 97 int __init kvm_timer_hyp_init(bool has_gic); 98 int kvm_timer_enable(struct kvm_vcpu *vcpu); 99 int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu); 100 void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu); 101 void kvm_timer_sync_user(struct kvm_vcpu *vcpu); 102 bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu); 103 void kvm_timer_update_run(struct kvm_vcpu *vcpu); 104 void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu); 105 106 void kvm_timer_init_vm(struct kvm *kvm); 107 108 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid); 109 int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value); 110 111 int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 112 int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 113 int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 114 115 u64 kvm_phys_timer_read(void); 116 117 void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu); 118 void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu); 119 120 void kvm_timer_init_vhe(void); 121 122 #define vcpu_timer(v) (&(v)->arch.timer_cpu) 123 #define vcpu_get_timer(v,t) (&vcpu_timer(v)->timers[(t)]) 124 #define vcpu_vtimer(v) (&(v)->arch.timer_cpu.timers[TIMER_VTIMER]) 125 #define vcpu_ptimer(v) (&(v)->arch.timer_cpu.timers[TIMER_PTIMER]) 126 #define vcpu_hvtimer(v) (&(v)->arch.timer_cpu.timers[TIMER_HVTIMER]) 127 #define vcpu_hptimer(v) (&(v)->arch.timer_cpu.timers[TIMER_HPTIMER]) 128 129 #define arch_timer_ctx_index(ctx) ((ctx) - vcpu_timer((ctx)->vcpu)->timers) 130 131 #define timer_vm_data(ctx) (&(ctx)->vcpu->kvm->arch.timer_data) 132 #define timer_irq(ctx) (timer_vm_data(ctx)->ppi[arch_timer_ctx_index(ctx)]) 133 134 u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu, 135 enum kvm_arch_timers tmr, 136 enum kvm_arch_timer_regs treg); 137 void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu, 138 enum kvm_arch_timers tmr, 139 enum kvm_arch_timer_regs treg, 140 u64 val); 141 142 /* Needed for tracing */ 143 u32 timer_get_ctl(struct arch_timer_context *ctxt); 144 u64 timer_get_cval(struct arch_timer_context *ctxt); 145 146 /* CPU HP callbacks */ 147 void kvm_timer_cpu_up(void); 148 void kvm_timer_cpu_down(void); 149 150 static inline bool has_cntpoff(void) 151 { 152 return (has_vhe() && cpus_have_final_cap(ARM64_HAS_ECV_CNTPOFF)); 153 } 154 155 #endif 156