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_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         /* Active IRQ state caching */
  35         bool                            active_cleared_last;
  36
  37         /* Virtual offset */
  38         u64                     cntvoff;
  39 };
  40
  41 struct arch_timer_cpu {
  42         struct arch_timer_context       vtimer;
  43         struct arch_timer_context       ptimer;
  44
  45         /* Background timer used when the guest is not running */
  46         struct hrtimer                  timer;
  47
  48         /* Work queued with the above timer expires */
  49         struct work_struct              expired;
  50
  51         /* Background timer active */
  52         bool                            armed;
  53
  54         /* Is the timer enabled */
  55         bool                    enabled;
  56 };
  57
  58 int kvm_timer_hyp_init(void);
  59 int kvm_timer_enable(struct kvm_vcpu *vcpu);
  60 int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
  61                          const struct kvm_irq_level *virt_irq,
  62                          const struct kvm_irq_level *phys_irq);
  63 void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
  64 void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu);
  65 void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);
  66 void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
  67
  68 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
  69 int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
  70
  71 bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx);
  72 void kvm_timer_schedule(struct kvm_vcpu *vcpu);
  73 void kvm_timer_unschedule(struct kvm_vcpu *vcpu);
  74
  75 u64 kvm_phys_timer_read(void);
  76
  77 void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);
  78
  79 void kvm_timer_init_vhe(void);
  80
  81 #define vcpu_vtimer(v)  (&(v)->arch.timer_cpu.vtimer)
  82 #define vcpu_ptimer(v)  (&(v)->arch.timer_cpu.ptimer)
  83 #endif