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 #include <linux/workqueue.h>
  25
  26 struct arch_timer_kvm {
  27 #ifdef CONFIG_KVM_ARM_TIMER
  28         /* Is the timer enabled */
  29         bool                    enabled;
  30
  31         /* Virtual offset */
  32         cycle_t                 cntvoff;
  33 #endif
  34 };
  35
  36 struct arch_timer_cpu {
  37 #ifdef CONFIG_KVM_ARM_TIMER
  38         /* Registers: control register, timer value */
  39         u32                             cntv_ctl;       /* Saved/restored */
  40         cycle_t                         cntv_cval;      /* Saved/restored */
  41
  42         /*
  43          * Anything that is not used directly from assembly code goes
  44          * here.
  45          */
  46
  47         /* Background timer used when the guest is not running */
  48         struct hrtimer                  timer;
  49
  50         /* Work queued with the above timer expires */
  51         struct work_struct              expired;
  52
  53         /* Background timer active */
  54         bool                            armed;
  55
  56         /* Timer IRQ */
  57         const struct kvm_irq_level      *irq;
  58 #endif
  59 };
  60
  61 #ifdef CONFIG_KVM_ARM_TIMER
  62 int kvm_timer_hyp_init(void);
  63 int kvm_timer_init(struct kvm *kvm);
  64 void kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
  65                           const struct kvm_irq_level *irq);
  66 void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
  67 void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu);
  68 void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);
  69 void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
  70
  71 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
  72 int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
  73
  74 #else
  75 static inline int kvm_timer_hyp_init(void)
  76 {
  77         return 0;
  78 };
  79
  80 static inline int kvm_timer_init(struct kvm *kvm)
  81 {
  82         return 0;
  83 }
  84
  85 static inline void kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
  86                                         const struct kvm_irq_level *irq) {}
  87 static inline void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu) {}
  88 static inline void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu) {}
  89 static inline void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu) {}
  90 static inline void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu) {}
  91
  92 static inline int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
  93 {
  94         return 0;
  95 }
  96
  97 static inline u64 kvm_arm_timer_get_reg(struct kvm_vcpu *vcpu, u64 regid)
  98 {
  99         return 0;
 100 }
 101 #endif
 102
 103 #endif