1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012 ARM Ltd. 4 * Author: Marc Zyngier <[email protected]> 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 /* Offset applied to the physical timer/counter */ 38 u64 poffset; 39 40 struct mutex lock; 41 42 /* The PPI for each timer, global to the VM */ 43 u8 ppi[NR_KVM_TIMERS]; 44 }; 45 46 struct arch_timer_context { 47 struct kvm_vcpu *vcpu; 48 49 /* Emulated Timer (may be unused) */ 50 struct hrtimer hrtimer; 51 u64 ns_frac; 52 53 /* Offset for this counter/timer */ 54 struct arch_timer_offset offset; 55 /* 56 * We have multiple paths which can save/restore the timer state onto 57 * the hardware, so we need some way of keeping track of where the 58 * latest state is. 59 */ 60 bool loaded; 61 62 /* Output level of the timer IRQ */ 63 struct { 64 bool level; 65 } irq; 66 67 /* Duplicated state from arch_timer.c for convenience */ 68 u32 host_timer_irq; 69 }; 70 71 struct timer_map { 72 struct arch_timer_context *direct_vtimer; 73 struct arch_timer_context *direct_ptimer; 74 struct arch_timer_context *emul_ptimer; 75 }; 76 77 struct arch_timer_cpu { 78 struct arch_timer_context timers[NR_KVM_TIMERS]; 79 80 /* Background timer used when the guest is not running */ 81 struct hrtimer bg_timer; 82 83 /* Is the timer enabled */ 84 bool enabled; 85 }; 86 87 int __init kvm_timer_hyp_init(bool has_gic); 88 int kvm_timer_enable(struct kvm_vcpu *vcpu); 89 int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu); 90 void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu); 91 void kvm_timer_sync_user(struct kvm_vcpu *vcpu); 92 bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu); 93 void kvm_timer_update_run(struct kvm_vcpu *vcpu); 94 void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu); 95 96 void kvm_timer_init_vm(struct kvm *kvm); 97 98 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid); 99 int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value); 100 101 int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 102 int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 103 int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 104 105 u64 kvm_phys_timer_read(void); 106 107 void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu); 108 void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu); 109 110 void kvm_timer_init_vhe(void); 111 112 bool kvm_arch_timer_get_input_level(int vintid); 113 114 #define vcpu_timer(v) (&(v)->arch.timer_cpu) 115 #define vcpu_get_timer(v,t) (&vcpu_timer(v)->timers[(t)]) 116 #define vcpu_vtimer(v) (&(v)->arch.timer_cpu.timers[TIMER_VTIMER]) 117 #define vcpu_ptimer(v) (&(v)->arch.timer_cpu.timers[TIMER_PTIMER]) 118 119 #define arch_timer_ctx_index(ctx) ((ctx) - vcpu_timer((ctx)->vcpu)->timers) 120 121 #define timer_vm_data(ctx) (&(ctx)->vcpu->kvm->arch.timer_data) 122 #define timer_irq(ctx) (timer_vm_data(ctx)->ppi[arch_timer_ctx_index(ctx)]) 123 124 u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu, 125 enum kvm_arch_timers tmr, 126 enum kvm_arch_timer_regs treg); 127 void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu, 128 enum kvm_arch_timers tmr, 129 enum kvm_arch_timer_regs treg, 130 u64 val); 131 132 /* Needed for tracing */ 133 u32 timer_get_ctl(struct arch_timer_context *ctxt); 134 u64 timer_get_cval(struct arch_timer_context *ctxt); 135 136 /* CPU HP callbacks */ 137 void kvm_timer_cpu_up(void); 138 void kvm_timer_cpu_down(void); 139 140 #endif 141