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 25 enum kvm_arch_timers { 26 TIMER_PTIMER, 27 TIMER_VTIMER, 28 NR_KVM_TIMERS 29 }; 30 31 enum kvm_arch_timer_regs { 32 TIMER_REG_CNT, 33 TIMER_REG_CVAL, 34 TIMER_REG_TVAL, 35 TIMER_REG_CTL, 36 }; 37 38 struct arch_timer_context { 39 struct kvm_vcpu *vcpu; 40 41 /* Registers: control register, timer value */ 42 u32 cnt_ctl; 43 u64 cnt_cval; 44 45 /* Timer IRQ */ 46 struct kvm_irq_level irq; 47 48 /* Virtual offset */ 49 u64 cntvoff; 50 51 /* Emulated Timer (may be unused) */ 52 struct hrtimer hrtimer; 53 54 /* 55 * We have multiple paths which can save/restore the timer state onto 56 * the hardware, so we need some way of keeping track of where the 57 * latest state is. 58 */ 59 bool loaded; 60 61 /* Duplicated state from arch_timer.c for convenience */ 62 u32 host_timer_irq; 63 u32 host_timer_irq_flags; 64 }; 65 66 struct timer_map { 67 struct arch_timer_context *direct_vtimer; 68 struct arch_timer_context *direct_ptimer; 69 struct arch_timer_context *emul_ptimer; 70 }; 71 72 struct arch_timer_cpu { 73 struct arch_timer_context timers[NR_KVM_TIMERS]; 74 75 /* Background timer used when the guest is not running */ 76 struct hrtimer bg_timer; 77 78 /* Is the timer enabled */ 79 bool enabled; 80 }; 81 82 int kvm_timer_hyp_init(bool); 83 int kvm_timer_enable(struct kvm_vcpu *vcpu); 84 int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu); 85 void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu); 86 void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu); 87 bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu); 88 void kvm_timer_update_run(struct kvm_vcpu *vcpu); 89 void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu); 90 91 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid); 92 int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value); 93 94 int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 95 int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 96 int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 97 98 bool kvm_timer_is_pending(struct kvm_vcpu *vcpu); 99 100 u64 kvm_phys_timer_read(void); 101 102 void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu); 103 void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu); 104 105 void kvm_timer_init_vhe(void); 106 107 bool kvm_arch_timer_get_input_level(int vintid); 108 109 #define vcpu_timer(v) (&(v)->arch.timer_cpu) 110 #define vcpu_get_timer(v,t) (&vcpu_timer(v)->timers[(t)]) 111 #define vcpu_vtimer(v) (&(v)->arch.timer_cpu.timers[TIMER_VTIMER]) 112 #define vcpu_ptimer(v) (&(v)->arch.timer_cpu.timers[TIMER_PTIMER]) 113 114 #define arch_timer_ctx_index(ctx) ((ctx) - vcpu_timer((ctx)->vcpu)->timers) 115 116 u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu, 117 enum kvm_arch_timers tmr, 118 enum kvm_arch_timer_regs treg); 119 void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu, 120 enum kvm_arch_timers tmr, 121 enum kvm_arch_timer_regs treg, 122 u64 val); 123 124 #endif 125