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_GROUP = 1U << 2,
104 PERF_RECORD_CALLCHAIN = 1U << 3,
108 * Bits that can be set in hw_event.read_format to request that
109 * reads on the counter should return the indicated quantities,
110 * in increasing order of bit value, after the counter value.
112 enum perf_counter_read_format {
113 PERF_FORMAT_TOTAL_TIME_ENABLED = 1,
114 PERF_FORMAT_TOTAL_TIME_RUNNING = 2,
118 * Hardware event to monitor via a performance monitoring counter:
120 struct perf_counter_hw_event {
122 * The MSB of the config word signifies if the rest contains cpu
123 * specific (raw) counter configuration data, if unset, the next
124 * 7 bits are an event type and the rest of the bits are the event
133 __u64 disabled : 1, /* off by default */
134 nmi : 1, /* NMI sampling */
135 inherit : 1, /* children inherit it */
136 pinned : 1, /* must always be on PMU */
137 exclusive : 1, /* only group on PMU */
138 exclude_user : 1, /* don't count user */
139 exclude_kernel : 1, /* ditto kernel */
140 exclude_hv : 1, /* ditto hypervisor */
141 exclude_idle : 1, /* don't count when idle */
142 mmap : 1, /* include mmap data */
143 munmap : 1, /* include munmap data */
147 __u32 extra_config_len;
148 __u32 wakeup_events; /* wakeup every n events */
155 * Ioctls that can be done on a perf counter fd:
157 #define PERF_COUNTER_IOC_ENABLE _IO('$', 0)
158 #define PERF_COUNTER_IOC_DISABLE _IO('$', 1)
161 * Structure of the page that can be mapped via mmap
163 struct perf_counter_mmap_page {
164 __u32 version; /* version number of this structure */
165 __u32 compat_version; /* lowest version this is compat with */
168 * Bits needed to read the hw counters in user-space.
175 * if (unlikely(seq & 1)) {
181 * count = pmc_read(pc->index - 1);
182 * count += pc->offset;
187 * if (pc->lock != seq)
190 * NOTE: for obvious reason this only works on self-monitoring
193 __u32 lock; /* seqlock for synchronization */
194 __u32 index; /* hardware counter identifier */
195 __s64 offset; /* add to hardware counter value */
198 * Control data for the mmap() data buffer.
200 * User-space reading this value should issue an rmb(), on SMP capable
201 * platforms, after reading this value -- see perf_counter_wakeup().
203 __u32 data_head; /* head in the data section */
206 struct perf_event_header {
211 enum perf_event_type {
214 PERF_EVENT_MUNMAP = 2,
217 * Half the event type space is reserved for the counter overflow
218 * bitfields, as found in hw_event.record_type.
220 * These events will have types of the form:
221 * PERF_EVENT_COUNTER_OVERFLOW { | __PERF_EVENT_* } *
223 PERF_EVENT_COUNTER_OVERFLOW = 1UL << 31,
224 __PERF_EVENT_IP = PERF_RECORD_IP,
225 __PERF_EVENT_TID = PERF_RECORD_TID,
226 __PERF_EVENT_GROUP = PERF_RECORD_GROUP,
227 __PERF_EVENT_CALLCHAIN = PERF_RECORD_CALLCHAIN,
232 * Kernel-internal data types and definitions:
235 #ifdef CONFIG_PERF_COUNTERS
236 # include <asm/perf_counter.h>
239 #include <linux/list.h>
240 #include <linux/mutex.h>
241 #include <linux/rculist.h>
242 #include <linux/rcupdate.h>
243 #include <linux/spinlock.h>
244 #include <linux/hrtimer.h>
245 #include <asm/atomic.h>
249 static inline u64 perf_event_raw(struct perf_counter_hw_event *hw_event)
251 return hw_event->config & PERF_COUNTER_RAW_MASK;
254 static inline u64 perf_event_config(struct perf_counter_hw_event *hw_event)
256 return hw_event->config & PERF_COUNTER_CONFIG_MASK;
259 static inline u64 perf_event_type(struct perf_counter_hw_event *hw_event)
261 return (hw_event->config & PERF_COUNTER_TYPE_MASK) >>
262 PERF_COUNTER_TYPE_SHIFT;
265 static inline u64 perf_event_id(struct perf_counter_hw_event *hw_event)
267 return hw_event->config & PERF_COUNTER_EVENT_MASK;
271 * struct hw_perf_counter - performance counter hardware details:
273 struct hw_perf_counter {
274 #ifdef CONFIG_PERF_COUNTERS
276 struct { /* hardware */
278 unsigned long config_base;
279 unsigned long counter_base;
283 union { /* software */
285 struct hrtimer hrtimer;
288 atomic64_t prev_count;
290 atomic64_t period_left;
297 * struct hw_perf_counter_ops - performance counter hw ops
299 struct hw_perf_counter_ops {
300 int (*enable) (struct perf_counter *counter);
301 void (*disable) (struct perf_counter *counter);
302 void (*read) (struct perf_counter *counter);
306 * enum perf_counter_active_state - the states of a counter
308 enum perf_counter_active_state {
309 PERF_COUNTER_STATE_ERROR = -2,
310 PERF_COUNTER_STATE_OFF = -1,
311 PERF_COUNTER_STATE_INACTIVE = 0,
312 PERF_COUNTER_STATE_ACTIVE = 1,
317 struct perf_mmap_data {
318 struct rcu_head rcu_head;
323 struct perf_counter_mmap_page *user_page;
327 struct perf_wakeup_entry {
328 struct perf_wakeup_entry *next;
332 * struct perf_counter - performance counter kernel representation:
334 struct perf_counter {
335 #ifdef CONFIG_PERF_COUNTERS
336 struct list_head list_entry;
337 struct list_head event_entry;
338 struct list_head sibling_list;
340 struct perf_counter *group_leader;
341 const struct hw_perf_counter_ops *hw_ops;
343 enum perf_counter_active_state state;
344 enum perf_counter_active_state prev_state;
348 * These are the total time in nanoseconds that the counter
349 * has been enabled (i.e. eligible to run, and the task has
350 * been scheduled in, if this is a per-task counter)
351 * and running (scheduled onto the CPU), respectively.
353 * They are computed from tstamp_enabled, tstamp_running and
354 * tstamp_stopped when the counter is in INACTIVE or ACTIVE state.
356 u64 total_time_enabled;
357 u64 total_time_running;
360 * These are timestamps used for computing total_time_enabled
361 * and total_time_running when the counter is in INACTIVE or
362 * ACTIVE state, measured in nanoseconds from an arbitrary point
364 * tstamp_enabled: the notional time when the counter was enabled
365 * tstamp_running: the notional time when the counter was scheduled on
366 * tstamp_stopped: in INACTIVE state, the notional time when the
367 * counter was scheduled off.
373 struct perf_counter_hw_event hw_event;
374 struct hw_perf_counter hw;
376 struct perf_counter_context *ctx;
377 struct task_struct *task;
380 struct perf_counter *parent;
381 struct list_head child_list;
384 * These accumulate total time (in nanoseconds) that children
385 * counters have been enabled and running, respectively.
387 atomic64_t child_total_time_enabled;
388 atomic64_t child_total_time_running;
391 * Protect attach/detach and child_list:
399 struct mutex mmap_mutex;
401 struct perf_mmap_data *data;
404 wait_queue_head_t waitq;
405 /* optional: for NMIs */
406 struct perf_wakeup_entry wakeup;
408 void (*destroy)(struct perf_counter *);
409 struct rcu_head rcu_head;
414 * struct perf_counter_context - counter context structure
416 * Used as a container for task counters and CPU counters as well:
418 struct perf_counter_context {
419 #ifdef CONFIG_PERF_COUNTERS
421 * Protect the states of the counters in the list,
422 * nr_active, and the list:
426 * Protect the list of counters. Locking either mutex or lock
427 * is sufficient to ensure the list doesn't change; to change
428 * the list you need to lock both the mutex and the spinlock.
432 struct list_head counter_list;
433 struct list_head event_list;
437 struct task_struct *task;
440 * time_now is the current time in nanoseconds since an arbitrary
441 * point in the past. For per-task counters, this is based on the
442 * task clock, and for per-cpu counters it is based on the cpu clock.
443 * time_lost is an offset from the task/cpu clock, used to make it
444 * appear that time only passes while the context is scheduled in.
452 * struct perf_counter_cpu_context - per cpu counter context structure
454 struct perf_cpu_context {
455 struct perf_counter_context ctx;
456 struct perf_counter_context *task_ctx;
462 * Recursion avoidance:
464 * task, softirq, irq, nmi context
470 * Set by architecture code:
472 extern int perf_max_counters;
474 #ifdef CONFIG_PERF_COUNTERS
475 extern const struct hw_perf_counter_ops *
476 hw_perf_counter_init(struct perf_counter *counter);
478 extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
479 extern void perf_counter_task_sched_out(struct task_struct *task, int cpu);
480 extern void perf_counter_task_tick(struct task_struct *task, int cpu);
481 extern void perf_counter_init_task(struct task_struct *child);
482 extern void perf_counter_exit_task(struct task_struct *child);
483 extern void perf_counter_do_pending(void);
484 extern void perf_counter_print_debug(void);
485 extern void perf_counter_unthrottle(void);
486 extern u64 hw_perf_save_disable(void);
487 extern void hw_perf_restore(u64 ctrl);
488 extern int perf_counter_task_disable(void);
489 extern int perf_counter_task_enable(void);
490 extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
491 struct perf_cpu_context *cpuctx,
492 struct perf_counter_context *ctx, int cpu);
493 extern void perf_counter_update_userpage(struct perf_counter *counter);
495 extern void perf_counter_output(struct perf_counter *counter,
496 int nmi, struct pt_regs *regs);
498 * Return 1 for a software counter, 0 for a hardware counter
500 static inline int is_software_counter(struct perf_counter *counter)
502 return !perf_event_raw(&counter->hw_event) &&
503 perf_event_type(&counter->hw_event) != PERF_TYPE_HARDWARE;
506 extern void perf_swcounter_event(u32, u64, int, struct pt_regs *);
508 extern void perf_counter_mmap(unsigned long addr, unsigned long len,
509 unsigned long pgoff, struct file *file);
511 extern void perf_counter_munmap(unsigned long addr, unsigned long len,
512 unsigned long pgoff, struct file *file);
514 #define MAX_STACK_DEPTH 254
516 struct perf_callchain_entry {
517 u32 nr, hv, kernel, user;
518 u64 ip[MAX_STACK_DEPTH];
521 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
525 perf_counter_task_sched_in(struct task_struct *task, int cpu) { }
527 perf_counter_task_sched_out(struct task_struct *task, int cpu) { }
529 perf_counter_task_tick(struct task_struct *task, int cpu) { }
530 static inline void perf_counter_init_task(struct task_struct *child) { }
531 static inline void perf_counter_exit_task(struct task_struct *child) { }
532 static inline void perf_counter_do_pending(void) { }
533 static inline void perf_counter_print_debug(void) { }
534 static inline void perf_counter_unthrottle(void) { }
535 static inline void hw_perf_restore(u64 ctrl) { }
536 static inline u64 hw_perf_save_disable(void) { return 0; }
537 static inline int perf_counter_task_disable(void) { return -EINVAL; }
538 static inline int perf_counter_task_enable(void) { return -EINVAL; }
541 perf_swcounter_event(u32 event, u64 nr, int nmi, struct pt_regs *regs) { }
545 perf_counter_mmap(unsigned long addr, unsigned long len,
546 unsigned long pgoff, struct file *file) { }
549 perf_counter_munmap(unsigned long addr, unsigned long len,
550 unsigned long pgoff, struct file *file) { }
554 #endif /* __KERNEL__ */
555 #endif /* _LINUX_PERF_COUNTER_H */