| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 */ |