2 * Performance counters:
4 * Copyright(C) 2008, Thomas Gleixner <tglx@linutronix.de>
5 * Copyright(C) 2008, Red Hat, Inc., Ingo Molnar
7 * Data type definitions, declarations, prototypes.
9 * Started by: Thomas Gleixner and Ingo Molnar
11 * For licencing details see kernel-base/COPYING
13 #ifndef _LINUX_PERF_COUNTER_H
14 #define _LINUX_PERF_COUNTER_H
16 #include <linux/types.h>
17 #include <linux/ioctl.h>
18 #include <asm/byteorder.h>
21 * User-space ABI bits:
27 enum perf_event_types {
28 PERF_TYPE_HARDWARE = 0,
29 PERF_TYPE_SOFTWARE = 1,
30 PERF_TYPE_TRACEPOINT = 2,
33 * available TYPE space, raw is the max value.
40 * Generalized performance counter event types, used by the hw_event.event_id
41 * parameter of the sys_perf_counter_open() syscall:
45 * Common hardware events, generalized by the kernel:
47 PERF_COUNT_CPU_CYCLES = 0,
48 PERF_COUNT_INSTRUCTIONS = 1,
49 PERF_COUNT_CACHE_REFERENCES = 2,
50 PERF_COUNT_CACHE_MISSES = 3,
51 PERF_COUNT_BRANCH_INSTRUCTIONS = 4,
52 PERF_COUNT_BRANCH_MISSES = 5,
53 PERF_COUNT_BUS_CYCLES = 6,
55 PERF_HW_EVENTS_MAX = 7,
59 * Special "software" counters provided by the kernel, even if the hardware
60 * does not support performance counters. These counters measure various
61 * physical and sw events of the kernel (and allow the profiling of them as
65 PERF_COUNT_CPU_CLOCK = 0,
66 PERF_COUNT_TASK_CLOCK = 1,
67 PERF_COUNT_PAGE_FAULTS = 2,
68 PERF_COUNT_CONTEXT_SWITCHES = 3,
69 PERF_COUNT_CPU_MIGRATIONS = 4,
70 PERF_COUNT_PAGE_FAULTS_MIN = 5,
71 PERF_COUNT_PAGE_FAULTS_MAJ = 6,
73 PERF_SW_EVENTS_MAX = 7,
76 #define __PERF_COUNTER_MASK(name) \
77 (((1ULL << PERF_COUNTER_##name##_BITS) - 1) << \
78 PERF_COUNTER_##name##_SHIFT)
80 #define PERF_COUNTER_RAW_BITS 1
81 #define PERF_COUNTER_RAW_SHIFT 63
82 #define PERF_COUNTER_RAW_MASK __PERF_COUNTER_MASK(RAW)
84 #define PERF_COUNTER_CONFIG_BITS 63
85 #define PERF_COUNTER_CONFIG_SHIFT 0
86 #define PERF_COUNTER_CONFIG_MASK __PERF_COUNTER_MASK(CONFIG)
88 #define PERF_COUNTER_TYPE_BITS 7
89 #define PERF_COUNTER_TYPE_SHIFT 56
90 #define PERF_COUNTER_TYPE_MASK __PERF_COUNTER_MASK(TYPE)
92 #define PERF_COUNTER_EVENT_BITS 56
93 #define PERF_COUNTER_EVENT_SHIFT 0
94 #define PERF_COUNTER_EVENT_MASK __PERF_COUNTER_MASK(EVENT)
97 * Bits that can be set in hw_event.record_type to request information
98 * in the overflow packets.
100 enum perf_counter_record_format {
101 PERF_RECORD_IP = 1U << 0,
102 PERF_RECORD_TID = 1U << 1,
103 PERF_RECORD_TIME = 1U << 2,
104 PERF_RECORD_GROUP = 1U << 3,
105 PERF_RECORD_CALLCHAIN = 1U << 4,
109 * Bits that can be set in hw_event.read_format to request that
110 * reads on the counter should return the indicated quantities,
111 * in increasing order of bit value, after the counter value.
113 enum perf_counter_read_format {
114 PERF_FORMAT_TOTAL_TIME_ENABLED = 1,
115 PERF_FORMAT_TOTAL_TIME_RUNNING = 2,
119 * Hardware event to monitor via a performance monitoring counter:
121 struct perf_counter_hw_event {
123 * The MSB of the config word signifies if the rest contains cpu
124 * specific (raw) counter configuration data, if unset, the next
125 * 7 bits are an event type and the rest of the bits are the event
134 __u64 disabled : 1, /* off by default */
135 nmi : 1, /* NMI sampling */
136 inherit : 1, /* children inherit it */
137 pinned : 1, /* must always be on PMU */
138 exclusive : 1, /* only group on PMU */
139 exclude_user : 1, /* don't count user */
140 exclude_kernel : 1, /* ditto kernel */
141 exclude_hv : 1, /* ditto hypervisor */
142 exclude_idle : 1, /* don't count when idle */
143 mmap : 1, /* include mmap data */
144 munmap : 1, /* include munmap data */
145 comm : 1, /* include comm data */
149 __u32 extra_config_len;
150 __u32 wakeup_events; /* wakeup every n events */
157 * Ioctls that can be done on a perf counter fd:
159 #define PERF_COUNTER_IOC_ENABLE _IO ('$', 0)
160 #define PERF_COUNTER_IOC_DISABLE _IO ('$', 1)
161 #define PERF_COUNTER_IOC_REFRESH _IOW('$', 2, u32)
164 * Structure of the page that can be mapped via mmap
166 struct perf_counter_mmap_page {
167 __u32 version; /* version number of this structure */
168 __u32 compat_version; /* lowest version this is compat with */
171 * Bits needed to read the hw counters in user-space.
181 * count = pmc_read(pc->index - 1);
182 * count += pc->offset;
187 * } while (pc->lock != seq);
189 * NOTE: for obvious reason this only works on self-monitoring
192 __u32 lock; /* seqlock for synchronization */
193 __u32 index; /* hardware counter identifier */
194 __s64 offset; /* add to hardware counter value */
197 * Control data for the mmap() data buffer.
199 * User-space reading this value should issue an rmb(), on SMP capable
200 * platforms, after reading this value -- see perf_counter_wakeup().
202 __u32 data_head; /* head in the data section */
205 #define PERF_EVENT_MISC_KERNEL (1 << 0)
206 #define PERF_EVENT_MISC_USER (1 << 1)
207 #define PERF_EVENT_MISC_OVERFLOW (1 << 2)
209 struct perf_event_header {
215 enum perf_event_type {
218 * The MMAP events record the PROT_EXEC mappings so that we can
219 * correlate userspace IPs to code. They have the following structure:
222 * struct perf_event_header header;
232 PERF_EVENT_MUNMAP = 2,
236 * struct perf_event_header header;
245 * When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
246 * will be PERF_RECORD_*
249 * struct perf_event_header header;
251 * { u64 ip; } && PERF_RECORD_IP
252 * { u32 pid, tid; } && PERF_RECORD_TID
253 * { u64 time; } && PERF_RECORD_TIME
256 * { u64 event, val; } cnt[nr]; } && PERF_RECORD_GROUP
262 * u64 ips[nr]; } && PERF_RECORD_CALLCHAIN
269 * Kernel-internal data types and definitions:
272 #ifdef CONFIG_PERF_COUNTERS
273 # include <asm/perf_counter.h>
276 #include <linux/list.h>
277 #include <linux/mutex.h>
278 #include <linux/rculist.h>
279 #include <linux/rcupdate.h>
280 #include <linux/spinlock.h>
281 #include <linux/hrtimer.h>
282 #include <linux/fs.h>
283 #include <asm/atomic.h>
287 static inline u64 perf_event_raw(struct perf_counter_hw_event *hw_event)
289 return hw_event->config & PERF_COUNTER_RAW_MASK;
292 static inline u64 perf_event_config(struct perf_counter_hw_event *hw_event)
294 return hw_event->config & PERF_COUNTER_CONFIG_MASK;
297 static inline u64 perf_event_type(struct perf_counter_hw_event *hw_event)
299 return (hw_event->config & PERF_COUNTER_TYPE_MASK) >>
300 PERF_COUNTER_TYPE_SHIFT;
303 static inline u64 perf_event_id(struct perf_counter_hw_event *hw_event)
305 return hw_event->config & PERF_COUNTER_EVENT_MASK;
309 * struct hw_perf_counter - performance counter hardware details:
311 struct hw_perf_counter {
312 #ifdef CONFIG_PERF_COUNTERS
314 struct { /* hardware */
316 unsigned long config_base;
317 unsigned long counter_base;
321 union { /* software */
323 struct hrtimer hrtimer;
326 atomic64_t prev_count;
328 atomic64_t period_left;
335 * struct hw_perf_counter_ops - performance counter hw ops
337 struct hw_perf_counter_ops {
338 int (*enable) (struct perf_counter *counter);
339 void (*disable) (struct perf_counter *counter);
340 void (*read) (struct perf_counter *counter);
344 * enum perf_counter_active_state - the states of a counter
346 enum perf_counter_active_state {
347 PERF_COUNTER_STATE_ERROR = -2,
348 PERF_COUNTER_STATE_OFF = -1,
349 PERF_COUNTER_STATE_INACTIVE = 0,
350 PERF_COUNTER_STATE_ACTIVE = 1,
355 struct perf_mmap_data {
356 struct rcu_head rcu_head;
357 int nr_pages; /* nr of data pages */
359 atomic_t wakeup; /* POLL_ for wakeups */
360 atomic_t head; /* write position */
361 atomic_t events; /* event limit */
363 struct perf_counter_mmap_page *user_page;
367 struct perf_pending_entry {
368 struct perf_pending_entry *next;
369 void (*func)(struct perf_pending_entry *);
373 * struct perf_counter - performance counter kernel representation:
375 struct perf_counter {
376 #ifdef CONFIG_PERF_COUNTERS
377 struct list_head list_entry;
378 struct list_head event_entry;
379 struct list_head sibling_list;
381 struct perf_counter *group_leader;
382 const struct hw_perf_counter_ops *hw_ops;
384 enum perf_counter_active_state state;
385 enum perf_counter_active_state prev_state;
389 * These are the total time in nanoseconds that the counter
390 * has been enabled (i.e. eligible to run, and the task has
391 * been scheduled in, if this is a per-task counter)
392 * and running (scheduled onto the CPU), respectively.
394 * They are computed from tstamp_enabled, tstamp_running and
395 * tstamp_stopped when the counter is in INACTIVE or ACTIVE state.
397 u64 total_time_enabled;
398 u64 total_time_running;
401 * These are timestamps used for computing total_time_enabled
402 * and total_time_running when the counter is in INACTIVE or
403 * ACTIVE state, measured in nanoseconds from an arbitrary point
405 * tstamp_enabled: the notional time when the counter was enabled
406 * tstamp_running: the notional time when the counter was scheduled on
407 * tstamp_stopped: in INACTIVE state, the notional time when the
408 * counter was scheduled off.
414 struct perf_counter_hw_event hw_event;
415 struct hw_perf_counter hw;
417 struct perf_counter_context *ctx;
418 struct task_struct *task;
421 struct perf_counter *parent;
422 struct list_head child_list;
425 * These accumulate total time (in nanoseconds) that children
426 * counters have been enabled and running, respectively.
428 atomic64_t child_total_time_enabled;
429 atomic64_t child_total_time_running;
432 * Protect attach/detach and child_list:
440 struct mutex mmap_mutex;
442 struct perf_mmap_data *data;
445 wait_queue_head_t waitq;
446 struct fasync_struct *fasync;
448 /* delayed work for NMIs and such */
452 struct perf_pending_entry pending;
454 atomic_t event_limit;
456 void (*destroy)(struct perf_counter *);
457 struct rcu_head rcu_head;
462 * struct perf_counter_context - counter context structure
464 * Used as a container for task counters and CPU counters as well:
466 struct perf_counter_context {
467 #ifdef CONFIG_PERF_COUNTERS
469 * Protect the states of the counters in the list,
470 * nr_active, and the list:
474 * Protect the list of counters. Locking either mutex or lock
475 * is sufficient to ensure the list doesn't change; to change
476 * the list you need to lock both the mutex and the spinlock.
480 struct list_head counter_list;
481 struct list_head event_list;
485 struct task_struct *task;
488 * Context clock, runs when context enabled.
496 * struct perf_counter_cpu_context - per cpu counter context structure
498 struct perf_cpu_context {
499 struct perf_counter_context ctx;
500 struct perf_counter_context *task_ctx;
506 * Recursion avoidance:
508 * task, softirq, irq, nmi context
514 * Set by architecture code:
516 extern int perf_max_counters;
518 #ifdef CONFIG_PERF_COUNTERS
519 extern const struct hw_perf_counter_ops *
520 hw_perf_counter_init(struct perf_counter *counter);
522 extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
523 extern void perf_counter_task_sched_out(struct task_struct *task, int cpu);
524 extern void perf_counter_task_tick(struct task_struct *task, int cpu);
525 extern void perf_counter_init_task(struct task_struct *child);
526 extern void perf_counter_exit_task(struct task_struct *child);
527 extern void perf_counter_do_pending(void);
528 extern void perf_counter_print_debug(void);
529 extern void perf_counter_unthrottle(void);
530 extern u64 hw_perf_save_disable(void);
531 extern void hw_perf_restore(u64 ctrl);
532 extern int perf_counter_task_disable(void);
533 extern int perf_counter_task_enable(void);
534 extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
535 struct perf_cpu_context *cpuctx,
536 struct perf_counter_context *ctx, int cpu);
537 extern void perf_counter_update_userpage(struct perf_counter *counter);
539 extern int perf_counter_overflow(struct perf_counter *counter,
540 int nmi, struct pt_regs *regs);
542 * Return 1 for a software counter, 0 for a hardware counter
544 static inline int is_software_counter(struct perf_counter *counter)
546 return !perf_event_raw(&counter->hw_event) &&
547 perf_event_type(&counter->hw_event) != PERF_TYPE_HARDWARE;
550 extern void perf_swcounter_event(u32, u64, int, struct pt_regs *);
552 extern void perf_counter_mmap(unsigned long addr, unsigned long len,
553 unsigned long pgoff, struct file *file);
555 extern void perf_counter_munmap(unsigned long addr, unsigned long len,
556 unsigned long pgoff, struct file *file);
558 extern void perf_counter_comm(struct task_struct *tsk);
560 #define MAX_STACK_DEPTH 255
562 struct perf_callchain_entry {
563 u16 nr, hv, kernel, user;
564 u64 ip[MAX_STACK_DEPTH];
567 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
571 perf_counter_task_sched_in(struct task_struct *task, int cpu) { }
573 perf_counter_task_sched_out(struct task_struct *task, int cpu) { }
575 perf_counter_task_tick(struct task_struct *task, int cpu) { }
576 static inline void perf_counter_init_task(struct task_struct *child) { }
577 static inline void perf_counter_exit_task(struct task_struct *child) { }
578 static inline void perf_counter_do_pending(void) { }
579 static inline void perf_counter_print_debug(void) { }
580 static inline void perf_counter_unthrottle(void) { }
581 static inline void hw_perf_restore(u64 ctrl) { }
582 static inline u64 hw_perf_save_disable(void) { return 0; }
583 static inline int perf_counter_task_disable(void) { return -EINVAL; }
584 static inline int perf_counter_task_enable(void) { return -EINVAL; }
587 perf_swcounter_event(u32 event, u64 nr, int nmi, struct pt_regs *regs) { }
591 perf_counter_mmap(unsigned long addr, unsigned long len,
592 unsigned long pgoff, struct file *file) { }
595 perf_counter_munmap(unsigned long addr, unsigned long len,
596 unsigned long pgoff, struct file *file) { }
598 static inline void perf_counter_comm(struct task_struct *tsk) { }
601 #endif /* __KERNEL__ */
602 #endif /* _LINUX_PERF_COUNTER_H */