LXR linux/include/linux/vtime.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _LINUX_KERNEL_VTIME_H
   3#define _LINUX_KERNEL_VTIME_H
   4
   5#include <linux/context_tracking_state.h>
   6#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
   7#include <asm/vtime.h>
   8#endif
   9
  10
  11struct task_struct;
  12
  13/*
  14 * vtime_accounting_cpu_enabled() definitions/declarations
  15 */
  16#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE)
  17static inline bool vtime_accounting_cpu_enabled(void) { return true; }
  18#elif defined(CONFIG_VIRT_CPU_ACCOUNTING_GEN)
  19/*
  20 * Checks if vtime is enabled on some CPU. Cputime readers want to be careful
  21 * in that case and compute the tickless cputime.
  22 * For now vtime state is tied to context tracking. We might want to decouple
  23 * those later if necessary.
  24 */
  25static inline bool vtime_accounting_enabled(void)
  26{
  27        return context_tracking_is_enabled();
  28}
  29
  30static inline bool vtime_accounting_cpu_enabled(void)
  31{
  32        if (vtime_accounting_enabled()) {
  33                if (context_tracking_cpu_is_enabled())
  34                        return true;
  35        }
  36
  37        return false;
  38}
  39#else /* !CONFIG_VIRT_CPU_ACCOUNTING */
  40static inline bool vtime_accounting_cpu_enabled(void) { return false; }
  41#endif
  42
  43
  44/*
  45 * Common vtime APIs
  46 */
  47#ifdef CONFIG_VIRT_CPU_ACCOUNTING
  48
  49#ifdef __ARCH_HAS_VTIME_TASK_SWITCH
  50extern void vtime_task_switch(struct task_struct *prev);
  51#else
  52extern void vtime_common_task_switch(struct task_struct *prev);
  53static inline void vtime_task_switch(struct task_struct *prev)
  54{
  55        if (vtime_accounting_cpu_enabled())
  56                vtime_common_task_switch(prev);
  57}
  58#endif /* __ARCH_HAS_VTIME_TASK_SWITCH */
  59
  60extern void vtime_account_system(struct task_struct *tsk);
  61extern void vtime_account_idle(struct task_struct *tsk);
  62
  63#else /* !CONFIG_VIRT_CPU_ACCOUNTING */
  64
  65static inline void vtime_task_switch(struct task_struct *prev) { }
  66static inline void vtime_account_system(struct task_struct *tsk) { }
  67#endif /* !CONFIG_VIRT_CPU_ACCOUNTING */
  68
  69#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
  70extern void arch_vtime_task_switch(struct task_struct *tsk);
  71extern void vtime_user_enter(struct task_struct *tsk);
  72extern void vtime_user_exit(struct task_struct *tsk);
  73extern void vtime_guest_enter(struct task_struct *tsk);
  74extern void vtime_guest_exit(struct task_struct *tsk);
  75extern void vtime_init_idle(struct task_struct *tsk, int cpu);
  76#else /* !CONFIG_VIRT_CPU_ACCOUNTING_GEN  */
  77static inline void vtime_user_enter(struct task_struct *tsk) { }
  78static inline void vtime_user_exit(struct task_struct *tsk) { }
  79static inline void vtime_guest_enter(struct task_struct *tsk) { }
  80static inline void vtime_guest_exit(struct task_struct *tsk) { }
  81static inline void vtime_init_idle(struct task_struct *tsk, int cpu) { }
  82#endif
  83
  84#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  85extern void vtime_account_irq_enter(struct task_struct *tsk);
  86static inline void vtime_account_irq_exit(struct task_struct *tsk)
  87{
  88        /* On hard|softirq exit we always account to hard|softirq cputime */
  89        vtime_account_system(tsk);
  90}
  91extern void vtime_flush(struct task_struct *tsk);
  92#else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
  93static inline void vtime_account_irq_enter(struct task_struct *tsk) { }
  94static inline void vtime_account_irq_exit(struct task_struct *tsk) { }
  95static inline void vtime_flush(struct task_struct *tsk) { }
  96#endif
  97
  98
  99#ifdef CONFIG_IRQ_TIME_ACCOUNTING
 100extern void irqtime_account_irq(struct task_struct *tsk);
 101#else
 102static inline void irqtime_account_irq(struct task_struct *tsk) { }
 103#endif
 104
 105static inline void account_irq_enter_time(struct task_struct *tsk)
 106{
 107        vtime_account_irq_enter(tsk);
 108        irqtime_account_irq(tsk);
 109}
 110
 111static inline void account_irq_exit_time(struct task_struct *tsk)
 112{
 113        vtime_account_irq_exit(tsk);
 114        irqtime_account_irq(tsk);
 115}
 116
 117#endif /* _LINUX_KERNEL_VTIME_H */
 118