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 11 struct task_struct; 12 13 /* 14 * vtime_accounting_cpu_enabled() definitions/declarations 15 */ 16 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) 17 static 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 */ 25 static inline bool vtime_accounting_enabled(void) 26 { 27 return context_tracking_is_enabled(); 28 } 29 30 static 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 */ 40 static 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 50 extern void vtime_task_switch(struct task_struct *prev); 51 #else 52 extern void vtime_common_task_switch(struct task_struct *prev); 53 static 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 60 extern void vtime_account_system(struct task_struct *tsk); 61 extern void vtime_account_idle(struct task_struct *tsk); 62 63 #else /* !CONFIG_VIRT_CPU_ACCOUNTING */ 64 65 static inline void vtime_task_switch(struct task_struct *prev) { } 66 static inline void vtime_account_system(struct task_struct *tsk) { } 67 #endif /* !CONFIG_VIRT_CPU_ACCOUNTING */ 68 69 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN 70 extern void arch_vtime_task_switch(struct task_struct *tsk); 71 extern void vtime_user_enter(struct task_struct *tsk); 72 extern void vtime_user_exit(struct task_struct *tsk); 73 extern void vtime_guest_enter(struct task_struct *tsk); 74 extern void vtime_guest_exit(struct task_struct *tsk); 75 extern void vtime_init_idle(struct task_struct *tsk, int cpu); 76 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_GEN */ 77 static inline void vtime_user_enter(struct task_struct *tsk) { } 78 static inline void vtime_user_exit(struct task_struct *tsk) { } 79 static inline void vtime_guest_enter(struct task_struct *tsk) { } 80 static inline void vtime_guest_exit(struct task_struct *tsk) { } 81 static inline void vtime_init_idle(struct task_struct *tsk, int cpu) { } 82 #endif 83 84 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 85 extern void vtime_account_irq_enter(struct task_struct *tsk); 86 static 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 } 91 extern void vtime_flush(struct task_struct *tsk); 92 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 93 static inline void vtime_account_irq_enter(struct task_struct *tsk) { } 94 static inline void vtime_account_irq_exit(struct task_struct *tsk) { } 95 static inline void vtime_flush(struct task_struct *tsk) { } 96 #endif 97 98 99 #ifdef CONFIG_IRQ_TIME_ACCOUNTING 100 extern void irqtime_account_irq(struct task_struct *tsk); 101 #else 102 static inline void irqtime_account_irq(struct task_struct *tsk) { } 103 #endif 104 105 static inline void account_irq_enter_time(struct task_struct *tsk) 106 { 107 vtime_account_irq_enter(tsk); 108 irqtime_account_irq(tsk); 109 } 110 111 static 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