/* * Performance counters: * * Copyright(C) 2008, Thomas Gleixner * Copyright(C) 2008, Red Hat, Inc., Ingo Molnar * * Data type definitions, declarations, prototypes. * * Started by: Thomas Gleixner and Ingo Molnar * * For licencing details see kernel-base/COPYING */ #ifndef _LINUX_PERF_COUNTER_H #define _LINUX_PERF_COUNTER_H #include #include /* * User-space ABI bits: */ /* * Generalized performance counter event types, used by the hw_event.type * parameter of the sys_perf_counter_open() syscall: */ enum hw_event_types { /* * Common hardware events, generalized by the kernel: */ PERF_COUNT_CPU_CYCLES = 0, PERF_COUNT_INSTRUCTIONS = 1, PERF_COUNT_CACHE_REFERENCES = 2, PERF_COUNT_CACHE_MISSES = 3, PERF_COUNT_BRANCH_INSTRUCTIONS = 4, PERF_COUNT_BRANCH_MISSES = 5, PERF_COUNT_BUS_CYCLES = 6, PERF_HW_EVENTS_MAX = 7, /* * Special "software" counters provided by the kernel, even if * the hardware does not support performance counters. These * counters measure various physical and sw events of the * kernel (and allow the profiling of them as well): */ PERF_COUNT_CPU_CLOCK = -1, PERF_COUNT_TASK_CLOCK = -2, PERF_COUNT_PAGE_FAULTS = -3, PERF_COUNT_CONTEXT_SWITCHES = -4, PERF_COUNT_CPU_MIGRATIONS = -5, PERF_SW_EVENTS_MIN = -6, }; /* * IRQ-notification data record type: */ enum perf_counter_record_type { PERF_RECORD_SIMPLE = 0, PERF_RECORD_IRQ = 1, PERF_RECORD_GROUP = 2, }; /* * Hardware event to monitor via a performance monitoring counter: */ struct perf_counter_hw_event { __s64 type; __u64 irq_period; __u32 record_type; __u32 disabled : 1, /* off by default */ nmi : 1, /* NMI sampling */ raw : 1, /* raw event type */ inherit : 1, /* children inherit it */ pinned : 1, /* must always be on PMU */ exclusive : 1, /* only group on PMU */ exclude_user : 1, /* don't count user */ exclude_kernel : 1, /* ditto kernel */ exclude_hv : 1, /* ditto hypervisor */ __reserved_1 : 23; __u64 __reserved_2; }; /* * Ioctls that can be done on a perf counter fd: */ #define PERF_COUNTER_IOC_ENABLE _IO('$', 0) #define PERF_COUNTER_IOC_DISABLE _IO('$', 1) #ifdef __KERNEL__ /* * Kernel-internal data types and definitions: */ #ifdef CONFIG_PERF_COUNTERS # include #endif #include #include #include #include #include #include struct task_struct; /** * struct hw_perf_counter - performance counter hardware details: */ struct hw_perf_counter { #ifdef CONFIG_PERF_COUNTERS u64 config; unsigned long config_base; unsigned long counter_base; int nmi; unsigned int idx; atomic64_t prev_count; u64 irq_period; atomic64_t period_left; #endif }; /* * Hardcoded buffer length limit for now, for IRQ-fed events: */ #define PERF_DATA_BUFLEN 2048 /** * struct perf_data - performance counter IRQ data sampling ... */ struct perf_data { int len; int rd_idx; int overrun; u8 data[PERF_DATA_BUFLEN]; }; struct perf_counter; /** * struct hw_perf_counter_ops - performance counter hw ops */ struct hw_perf_counter_ops { int (*enable) (struct perf_counter *counter); void (*disable) (struct perf_counter *counter); void (*read) (struct perf_counter *counter); }; /** * enum perf_counter_active_state - the states of a counter */ enum perf_counter_active_state { PERF_COUNTER_STATE_ERROR = -2, PERF_COUNTER_STATE_OFF = -1, PERF_COUNTER_STATE_INACTIVE = 0, PERF_COUNTER_STATE_ACTIVE = 1, }; struct file; /** * struct perf_counter - performance counter kernel representation: */ struct perf_counter { #ifdef CONFIG_PERF_COUNTERS struct list_head list_entry; struct list_head sibling_list; struct perf_counter *group_leader; const struct hw_perf_counter_ops *hw_ops; enum perf_counter_active_state state; enum perf_counter_active_state prev_state; atomic64_t count; struct perf_counter_hw_event hw_event; struct hw_perf_counter hw; struct perf_counter_context *ctx; struct task_struct *task; struct file *filp; struct perf_counter *parent; struct list_head child_list; /* * Protect attach/detach and child_list: */ struct mutex mutex; int oncpu; int cpu; /* read() / irq related data */ wait_queue_head_t waitq; /* optional: for NMIs */ int wakeup_pending; struct perf_data *irqdata; struct perf_data *usrdata; struct perf_data data[2]; #endif }; /** * struct perf_counter_context - counter context structure * * Used as a container for task counters and CPU counters as well: */ struct perf_counter_context { #ifdef CONFIG_PERF_COUNTERS /* * Protect the states of the counters in the list, * nr_active, and the list: */ spinlock_t lock; /* * Protect the list of counters. Locking either mutex or lock * is sufficient to ensure the list doesn't change; to change * the list you need to lock both the mutex and the spinlock. */ struct mutex mutex; struct list_head counter_list; int nr_counters; int nr_active; int is_active; struct task_struct *task; #endif }; /** * struct perf_counter_cpu_context - per cpu counter context structure */ struct perf_cpu_context { struct perf_counter_context ctx; struct perf_counter_context *task_ctx; int active_oncpu; int max_pertask; int exclusive; }; /* * Set by architecture code: */ extern int perf_max_counters; #ifdef CONFIG_PERF_COUNTERS extern const struct hw_perf_counter_ops * hw_perf_counter_init(struct perf_counter *counter); extern void perf_counter_task_sched_in(struct task_struct *task, int cpu); extern void perf_counter_task_sched_out(struct task_struct *task, int cpu); extern void perf_counter_task_tick(struct task_struct *task, int cpu); extern void perf_counter_init_task(struct task_struct *child); extern void perf_counter_exit_task(struct task_struct *child); extern void perf_counter_notify(struct pt_regs *regs); extern void perf_counter_print_debug(void); extern void perf_counter_unthrottle(void); extern u64 hw_perf_save_disable(void); extern void hw_perf_restore(u64 ctrl); extern int perf_counter_task_disable(void); extern int perf_counter_task_enable(void); extern int hw_perf_group_sched_in(struct perf_counter *group_leader, struct perf_cpu_context *cpuctx, struct perf_counter_context *ctx, int cpu); /* * Return 1 for a software counter, 0 for a hardware counter */ static inline int is_software_counter(struct perf_counter *counter) { return !counter->hw_event.raw && counter->hw_event.type < 0; } #else static inline void perf_counter_task_sched_in(struct task_struct *task, int cpu) { } static inline void perf_counter_task_sched_out(struct task_struct *task, int cpu) { } static inline void perf_counter_task_tick(struct task_struct *task, int cpu) { } static inline void perf_counter_init_task(struct task_struct *child) { } static inline void perf_counter_exit_task(struct task_struct *child) { } static inline void perf_counter_notify(struct pt_regs *regs) { } static inline void perf_counter_print_debug(void) { } static inline void perf_counter_unthrottle(void) { } static inline void hw_perf_restore(u64 ctrl) { } static inline u64 hw_perf_save_disable(void) { return 0; } static inline int perf_counter_task_disable(void) { return -EINVAL; } static inline int perf_counter_task_enable(void) { return -EINVAL; } #endif #endif /* __KERNEL__ */ #endif /* _LINUX_PERF_COUNTER_H */