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_enabled_this_cpu() definitions/declarations
  15 */
  16#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE)
  17
  18static inline bool vtime_accounting_enabled_this_cpu(void) { return true; }
  19extern void vtime_task_switch(struct task_struct *prev);
  20
  21#elif defined(CONFIG_VIRT_CPU_ACCOUNTING_GEN)
  22
  23/*
  24 * Checks if vtime is enabled on some CPU. Cputime readers want to be careful
  25 * in that case and compute the tickless cputime.
  26 * For now vtime state is tied to context tracking. We might want to decouple
  27 * those later if necessary.
  28 */
  29static inline bool vtime_accounting_enabled(void)
  30{
  31        return context_tracking_enabled();
  32}
  33
  34static inline bool vtime_accounting_enabled_cpu(int cpu)
  35{
  36        return context_tracking_enabled_cpu(cpu);
  37}
  38
  39static inline bool vtime_accounting_enabled_this_cpu(void)
  40{
  41        return context_tracking_enabled_this_cpu();
  42}
  43
  44extern void vtime_task_switch_generic(struct task_struct *prev);
  45
  46static inline void vtime_task_switch(struct task_struct *prev)
  47{
  48        if (vtime_accounting_enabled_this_cpu())
  49                vtime_task_switch_generic(prev);
  50}
  51
  52#else /* !CONFIG_VIRT_CPU_ACCOUNTING */
  53
  54static inline bool vtime_accounting_enabled_cpu(int cpu) {return false; }
  55static inline bool vtime_accounting_enabled_this_cpu(void) { return false; }
  56static inline void vtime_task_switch(struct task_struct *prev) { }
  57
  58#endif
  59
  60/*
  61 * Common vtime APIs
  62 */
  63#ifdef CONFIG_VIRT_CPU_ACCOUNTING
  64extern void vtime_account_kernel(struct task_struct *tsk);
  65extern void vtime_account_idle(struct task_struct *tsk);
  66#else /* !CONFIG_VIRT_CPU_ACCOUNTING */
  67static inline void vtime_account_kernel(struct task_struct *tsk) { }
  68#endif /* !CONFIG_VIRT_CPU_ACCOUNTING */
  69
  70#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
  71extern void arch_vtime_task_switch(struct task_struct *tsk);
  72extern void vtime_user_enter(struct task_struct *tsk);
  73extern void vtime_user_exit(struct task_struct *tsk);
  74extern void vtime_guest_enter(struct task_struct *tsk);
  75extern void vtime_guest_exit(struct task_struct *tsk);
  76extern void vtime_init_idle(struct task_struct *tsk, int cpu);
  77#else /* !CONFIG_VIRT_CPU_ACCOUNTING_GEN  */
  78static inline void vtime_user_enter(struct task_struct *tsk) { }
  79static inline void vtime_user_exit(struct task_struct *tsk) { }
  80static inline void vtime_guest_enter(struct task_struct *tsk) { }
  81static inline void vtime_guest_exit(struct task_struct *tsk) { }
  82static inline void vtime_init_idle(struct task_struct *tsk, int cpu) { }
  83#endif
  84
  85#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  86extern void vtime_account_irq_enter(struct task_struct *tsk);
  87static inline void vtime_account_irq_exit(struct task_struct *tsk)
  88{
  89        /* On hard|softirq exit we always account to hard|softirq cputime */
  90        vtime_account_kernel(tsk);
  91}
  92extern void vtime_flush(struct task_struct *tsk);
  93#else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
  94static inline void vtime_account_irq_enter(struct task_struct *tsk) { }
  95static inline void vtime_account_irq_exit(struct task_struct *tsk) { }
  96static inline void vtime_flush(struct task_struct *tsk) { }
  97#endif
  98
  99
 100#ifdef CONFIG_IRQ_TIME_ACCOUNTING
 101extern void irqtime_account_irq(struct task_struct *tsk);
 102#else
 103static inline void irqtime_account_irq(struct task_struct *tsk) { }
 104#endif
 105
 106static inline void account_irq_enter_time(struct task_struct *tsk)
 107{
 108        vtime_account_irq_enter(tsk);
 109        irqtime_account_irq(tsk);
 110}
 111
 112static inline void account_irq_exit_time(struct task_struct *tsk)
 113{
 114        vtime_account_irq_exit(tsk);
 115        irqtime_account_irq(tsk);
 116}
 117
 118#endif /* _LINUX_KERNEL_VTIME_H */
 119