include/kvm/arm_arch_timer.h

   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