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 #include <linux/workqueue.h> 25 26 struct arch_timer_context { 27 /* Registers: control register, timer value */ 28 u32 cnt_ctl; 29 u64 cnt_cval; 30 31 /* Timer IRQ */ 32 struct kvm_irq_level irq; 33 34 /* 35 * We have multiple paths which can save/restore the timer state 36 * onto the hardware, so we need some way of keeping track of 37 * where the latest state is. 38 * 39 * loaded == true: State is loaded on the hardware registers. 40 * loaded == false: State is stored in memory. 41 */ 42 bool loaded; 43 44 /* Virtual offset */ 45 u64 cntvoff; 46 }; 47 48 struct arch_timer_cpu { 49 struct arch_timer_context vtimer; 50 struct arch_timer_context ptimer; 51 52 /* Background timer used when the guest is not running */ 53 struct hrtimer bg_timer; 54 55 /* Work queued with the above timer expires */ 56 struct work_struct expired; 57 58 /* Physical timer emulation */ 59 struct hrtimer phys_timer; 60 61 /* Is the timer enabled */ 62 bool enabled; 63 }; 64 65 int kvm_timer_hyp_init(bool); 66 int kvm_timer_enable(struct kvm_vcpu *vcpu); 67 int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu); 68 void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu); 69 void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu); 70 bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu); 71 void kvm_timer_update_run(struct kvm_vcpu *vcpu); 72 void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu); 73 74 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid); 75 int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value); 76 77 int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 78 int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 79 int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); 80 81 bool kvm_timer_is_pending(struct kvm_vcpu *vcpu); 82 83 void kvm_timer_schedule(struct kvm_vcpu *vcpu); 84 void kvm_timer_unschedule(struct kvm_vcpu *vcpu); 85 86 u64 kvm_phys_timer_read(void); 87 88 void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu); 89 void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu); 90 91 void kvm_timer_init_vhe(void); 92 93 bool kvm_arch_timer_get_input_level(int vintid); 94 95 #define vcpu_vtimer(v) (&(v)->arch.timer_cpu.vtimer) 96 #define vcpu_ptimer(v) (&(v)->arch.timer_cpu.ptimer) 97 98 #endif 99