4 * Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
5 * Copyright (C) 2008-2009, Red Hat, Inc., Ingo Molnar
6 * Copyright (C) 2008-2009, Red Hat, Inc., Peter Zijlstra
8 * Data type definitions, declarations, prototypes.
10 * Started by: Thomas Gleixner and Ingo Molnar
12 * For licencing details see kernel-base/COPYING
14 #ifndef _LINUX_PERF_EVENT_H
15 #define _LINUX_PERF_EVENT_H
17 #include <linux/types.h>
18 #include <linux/ioctl.h>
19 #include <asm/byteorder.h>
22 * User-space ABI bits:
29 PERF_TYPE_HARDWARE = 0,
30 PERF_TYPE_SOFTWARE = 1,
31 PERF_TYPE_TRACEPOINT = 2,
32 PERF_TYPE_HW_CACHE = 3,
34 PERF_TYPE_BREAKPOINT = 5,
36 PERF_TYPE_MAX, /* non-ABI */
40 * Generalized performance event event_id types, used by the
41 * attr.event_id parameter of the sys_perf_event_open()
46 * Common hardware events, generalized by the kernel:
48 PERF_COUNT_HW_CPU_CYCLES = 0,
49 PERF_COUNT_HW_INSTRUCTIONS = 1,
50 PERF_COUNT_HW_CACHE_REFERENCES = 2,
51 PERF_COUNT_HW_CACHE_MISSES = 3,
52 PERF_COUNT_HW_BRANCH_INSTRUCTIONS = 4,
53 PERF_COUNT_HW_BRANCH_MISSES = 5,
54 PERF_COUNT_HW_BUS_CYCLES = 6,
56 PERF_COUNT_HW_MAX, /* non-ABI */
60 * Generalized hardware cache events:
62 * { L1-D, L1-I, LLC, ITLB, DTLB, BPU } x
63 * { read, write, prefetch } x
64 * { accesses, misses }
66 enum perf_hw_cache_id {
67 PERF_COUNT_HW_CACHE_L1D = 0,
68 PERF_COUNT_HW_CACHE_L1I = 1,
69 PERF_COUNT_HW_CACHE_LL = 2,
70 PERF_COUNT_HW_CACHE_DTLB = 3,
71 PERF_COUNT_HW_CACHE_ITLB = 4,
72 PERF_COUNT_HW_CACHE_BPU = 5,
74 PERF_COUNT_HW_CACHE_MAX, /* non-ABI */
77 enum perf_hw_cache_op_id {
78 PERF_COUNT_HW_CACHE_OP_READ = 0,
79 PERF_COUNT_HW_CACHE_OP_WRITE = 1,
80 PERF_COUNT_HW_CACHE_OP_PREFETCH = 2,
82 PERF_COUNT_HW_CACHE_OP_MAX, /* non-ABI */
85 enum perf_hw_cache_op_result_id {
86 PERF_COUNT_HW_CACHE_RESULT_ACCESS = 0,
87 PERF_COUNT_HW_CACHE_RESULT_MISS = 1,
89 PERF_COUNT_HW_CACHE_RESULT_MAX, /* non-ABI */
93 * Special "software" events provided by the kernel, even if the hardware
94 * does not support performance events. These events measure various
95 * physical and sw events of the kernel (and allow the profiling of them as
99 PERF_COUNT_SW_CPU_CLOCK = 0,
100 PERF_COUNT_SW_TASK_CLOCK = 1,
101 PERF_COUNT_SW_PAGE_FAULTS = 2,
102 PERF_COUNT_SW_CONTEXT_SWITCHES = 3,
103 PERF_COUNT_SW_CPU_MIGRATIONS = 4,
104 PERF_COUNT_SW_PAGE_FAULTS_MIN = 5,
105 PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6,
106 PERF_COUNT_SW_ALIGNMENT_FAULTS = 7,
107 PERF_COUNT_SW_EMULATION_FAULTS = 8,
109 PERF_COUNT_SW_MAX, /* non-ABI */
113 * Bits that can be set in attr.sample_type to request information
114 * in the overflow packets.
116 enum perf_event_sample_format {
117 PERF_SAMPLE_IP = 1U << 0,
118 PERF_SAMPLE_TID = 1U << 1,
119 PERF_SAMPLE_TIME = 1U << 2,
120 PERF_SAMPLE_ADDR = 1U << 3,
121 PERF_SAMPLE_READ = 1U << 4,
122 PERF_SAMPLE_CALLCHAIN = 1U << 5,
123 PERF_SAMPLE_ID = 1U << 6,
124 PERF_SAMPLE_CPU = 1U << 7,
125 PERF_SAMPLE_PERIOD = 1U << 8,
126 PERF_SAMPLE_STREAM_ID = 1U << 9,
127 PERF_SAMPLE_RAW = 1U << 10,
129 PERF_SAMPLE_MAX = 1U << 11, /* non-ABI */
133 * The format of the data returned by read() on a perf event fd,
134 * as specified by attr.read_format:
136 * struct read_format {
138 * { u64 time_enabled; } && PERF_FORMAT_ENABLED
139 * { u64 time_running; } && PERF_FORMAT_RUNNING
140 * { u64 id; } && PERF_FORMAT_ID
141 * } && !PERF_FORMAT_GROUP
144 * { u64 time_enabled; } && PERF_FORMAT_ENABLED
145 * { u64 time_running; } && PERF_FORMAT_RUNNING
147 * { u64 id; } && PERF_FORMAT_ID
149 * } && PERF_FORMAT_GROUP
152 enum perf_event_read_format {
153 PERF_FORMAT_TOTAL_TIME_ENABLED = 1U << 0,
154 PERF_FORMAT_TOTAL_TIME_RUNNING = 1U << 1,
155 PERF_FORMAT_ID = 1U << 2,
156 PERF_FORMAT_GROUP = 1U << 3,
158 PERF_FORMAT_MAX = 1U << 4, /* non-ABI */
161 #define PERF_ATTR_SIZE_VER0 64 /* sizeof first published struct */
164 * Hardware event_id to monitor via a performance monitoring event:
166 struct perf_event_attr {
169 * Major type: hardware/software/tracepoint/etc.
174 * Size of the attr structure, for fwd/bwd compat.
179 * Type specific configuration information.
191 __u64 disabled : 1, /* off by default */
192 inherit : 1, /* children inherit it */
193 pinned : 1, /* must always be on PMU */
194 exclusive : 1, /* only group on PMU */
195 exclude_user : 1, /* don't count user */
196 exclude_kernel : 1, /* ditto kernel */
197 exclude_hv : 1, /* ditto hypervisor */
198 exclude_idle : 1, /* don't count when idle */
199 mmap : 1, /* include mmap data */
200 comm : 1, /* include comm data */
201 freq : 1, /* use freq, not period */
202 inherit_stat : 1, /* per task counts */
203 enable_on_exec : 1, /* next exec enables */
204 task : 1, /* trace fork/exit */
205 watermark : 1, /* wakeup_watermark */
209 * 0 - SAMPLE_IP can have arbitrary skid
210 * 1 - SAMPLE_IP must have constant skid
211 * 2 - SAMPLE_IP requested to have 0 skid
212 * 3 - SAMPLE_IP must have 0 skid
214 * See also PERF_RECORD_MISC_EXACT_IP
216 precise_ip : 2, /* skid constraint */
217 mmap_data : 1, /* non-exec mmap data */
222 __u32 wakeup_events; /* wakeup every n events */
223 __u32 wakeup_watermark; /* bytes before wakeup */
232 * Ioctls that can be done on a perf event fd:
234 #define PERF_EVENT_IOC_ENABLE _IO ('$', 0)
235 #define PERF_EVENT_IOC_DISABLE _IO ('$', 1)
236 #define PERF_EVENT_IOC_REFRESH _IO ('$', 2)
237 #define PERF_EVENT_IOC_RESET _IO ('$', 3)
238 #define PERF_EVENT_IOC_PERIOD _IOW('$', 4, __u64)
239 #define PERF_EVENT_IOC_SET_OUTPUT _IO ('$', 5)
240 #define PERF_EVENT_IOC_SET_FILTER _IOW('$', 6, char *)
242 enum perf_event_ioc_flags {
243 PERF_IOC_FLAG_GROUP = 1U << 0,
247 * Structure of the page that can be mapped via mmap
249 struct perf_event_mmap_page {
250 __u32 version; /* version number of this structure */
251 __u32 compat_version; /* lowest version this is compat with */
254 * Bits needed to read the hw events in user-space.
264 * count = pmc_read(pc->index - 1);
265 * count += pc->offset;
270 * } while (pc->lock != seq);
272 * NOTE: for obvious reason this only works on self-monitoring
275 __u32 lock; /* seqlock for synchronization */
276 __u32 index; /* hardware event identifier */
277 __s64 offset; /* add to hardware event value */
278 __u64 time_enabled; /* time event active */
279 __u64 time_running; /* time event on cpu */
282 * Hole for extension of the self monitor capabilities
285 __u64 __reserved[123]; /* align to 1k */
288 * Control data for the mmap() data buffer.
290 * User-space reading the @data_head value should issue an rmb(), on
291 * SMP capable platforms, after reading this value -- see
292 * perf_event_wakeup().
294 * When the mapping is PROT_WRITE the @data_tail value should be
295 * written by userspace to reflect the last read data. In this case
296 * the kernel will not over-write unread data.
298 __u64 data_head; /* head in the data section */
299 __u64 data_tail; /* user-space written tail */
302 #define PERF_RECORD_MISC_CPUMODE_MASK (7 << 0)
303 #define PERF_RECORD_MISC_CPUMODE_UNKNOWN (0 << 0)
304 #define PERF_RECORD_MISC_KERNEL (1 << 0)
305 #define PERF_RECORD_MISC_USER (2 << 0)
306 #define PERF_RECORD_MISC_HYPERVISOR (3 << 0)
307 #define PERF_RECORD_MISC_GUEST_KERNEL (4 << 0)
308 #define PERF_RECORD_MISC_GUEST_USER (5 << 0)
311 * Indicates that the content of PERF_SAMPLE_IP points to
312 * the actual instruction that triggered the event. See also
313 * perf_event_attr::precise_ip.
315 #define PERF_RECORD_MISC_EXACT_IP (1 << 14)
317 * Reserve the last bit to indicate some extended misc field
319 #define PERF_RECORD_MISC_EXT_RESERVED (1 << 15)
321 struct perf_event_header {
327 enum perf_event_type {
330 * The MMAP events record the PROT_EXEC mappings so that we can
331 * correlate userspace IPs to code. They have the following structure:
334 * struct perf_event_header header;
343 PERF_RECORD_MMAP = 1,
347 * struct perf_event_header header;
352 PERF_RECORD_LOST = 2,
356 * struct perf_event_header header;
362 PERF_RECORD_COMM = 3,
366 * struct perf_event_header header;
372 PERF_RECORD_EXIT = 4,
376 * struct perf_event_header header;
382 PERF_RECORD_THROTTLE = 5,
383 PERF_RECORD_UNTHROTTLE = 6,
387 * struct perf_event_header header;
393 PERF_RECORD_FORK = 7,
397 * struct perf_event_header header;
400 * struct read_format values;
403 PERF_RECORD_READ = 8,
407 * struct perf_event_header header;
409 * { u64 ip; } && PERF_SAMPLE_IP
410 * { u32 pid, tid; } && PERF_SAMPLE_TID
411 * { u64 time; } && PERF_SAMPLE_TIME
412 * { u64 addr; } && PERF_SAMPLE_ADDR
413 * { u64 id; } && PERF_SAMPLE_ID
414 * { u64 stream_id;} && PERF_SAMPLE_STREAM_ID
415 * { u32 cpu, res; } && PERF_SAMPLE_CPU
416 * { u64 period; } && PERF_SAMPLE_PERIOD
418 * { struct read_format values; } && PERF_SAMPLE_READ
421 * u64 ips[nr]; } && PERF_SAMPLE_CALLCHAIN
424 * # The RAW record below is opaque data wrt the ABI
426 * # That is, the ABI doesn't make any promises wrt to
427 * # the stability of its content, it may vary depending
428 * # on event, hardware, kernel version and phase of
431 * # In other words, PERF_SAMPLE_RAW contents are not an ABI.
435 * char data[size];}&& PERF_SAMPLE_RAW
438 PERF_RECORD_SAMPLE = 9,
440 PERF_RECORD_MAX, /* non-ABI */
443 enum perf_callchain_context {
444 PERF_CONTEXT_HV = (__u64)-32,
445 PERF_CONTEXT_KERNEL = (__u64)-128,
446 PERF_CONTEXT_USER = (__u64)-512,
448 PERF_CONTEXT_GUEST = (__u64)-2048,
449 PERF_CONTEXT_GUEST_KERNEL = (__u64)-2176,
450 PERF_CONTEXT_GUEST_USER = (__u64)-2560,
452 PERF_CONTEXT_MAX = (__u64)-4095,
455 #define PERF_FLAG_FD_NO_GROUP (1U << 0)
456 #define PERF_FLAG_FD_OUTPUT (1U << 1)
460 * Kernel-internal data types and definitions:
463 #ifdef CONFIG_PERF_EVENTS
464 # include <asm/perf_event.h>
465 # include <asm/local64.h>
468 struct perf_guest_info_callbacks {
469 int (*is_in_guest) (void);
470 int (*is_user_mode) (void);
471 unsigned long (*get_guest_ip) (void);
474 #ifdef CONFIG_HAVE_HW_BREAKPOINT
475 #include <asm/hw_breakpoint.h>
478 #include <linux/list.h>
479 #include <linux/mutex.h>
480 #include <linux/rculist.h>
481 #include <linux/rcupdate.h>
482 #include <linux/spinlock.h>
483 #include <linux/hrtimer.h>
484 #include <linux/fs.h>
485 #include <linux/pid_namespace.h>
486 #include <linux/workqueue.h>
487 #include <linux/ftrace.h>
488 #include <linux/cpu.h>
489 #include <asm/atomic.h>
490 #include <asm/local.h>
492 #define PERF_MAX_STACK_DEPTH 255
494 struct perf_callchain_entry {
496 __u64 ip[PERF_MAX_STACK_DEPTH];
499 struct perf_raw_record {
504 struct perf_branch_entry {
510 struct perf_branch_stack {
512 struct perf_branch_entry entries[0];
518 * struct hw_perf_event - performance event hardware details:
520 struct hw_perf_event {
521 #ifdef CONFIG_PERF_EVENTS
523 struct { /* hardware */
526 unsigned long config_base;
527 unsigned long event_base;
531 struct { /* software */
532 struct hrtimer hrtimer;
534 #ifdef CONFIG_HAVE_HW_BREAKPOINT
535 struct { /* breakpoint */
536 struct arch_hw_breakpoint info;
537 struct list_head bp_list;
542 local64_t prev_count;
545 local64_t period_left;
549 u64 freq_count_stamp;
554 * hw_perf_event::state flags
556 #define PERF_HES_STOPPED 0x01 /* the counter is stopped */
557 #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
558 #define PERF_HES_ARCH 0x04
563 * Common implementation detail of pmu::{start,commit,cancel}_txn
565 #define PERF_EVENT_TXN 0x1
568 * struct pmu - generic performance monitoring unit
571 struct list_head entry;
573 int *pmu_disable_count;
576 * Fully disable/enable this PMU, can be used to protect from the PMI
577 * as well as for lazy/batch writing of the MSRs.
579 void (*pmu_enable) (struct pmu *pmu); /* optional */
580 void (*pmu_disable) (struct pmu *pmu); /* optional */
583 * Try and initialize the event for this PMU.
584 * Should return -ENOENT when the @event doesn't match this PMU.
586 int (*event_init) (struct perf_event *event);
588 #define PERF_EF_START 0x01 /* start the counter when adding */
589 #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
590 #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
593 * Adds/Removes a counter to/from the PMU, can be done inside
594 * a transaction, see the ->*_txn() methods.
596 int (*add) (struct perf_event *event, int flags);
597 void (*del) (struct perf_event *event, int flags);
600 * Starts/Stops a counter present on the PMU. The PMI handler
601 * should stop the counter when perf_event_overflow() returns
602 * !0. ->start() will be used to continue.
604 void (*start) (struct perf_event *event, int flags);
605 void (*stop) (struct perf_event *event, int flags);
608 * Updates the counter value of the event.
610 void (*read) (struct perf_event *event);
613 * Group events scheduling is treated as a transaction, add
614 * group events as a whole and perform one schedulability test.
615 * If the test fails, roll back the whole group
617 * Start the transaction, after this ->add() doesn't need to
618 * do schedulability tests.
620 void (*start_txn) (struct pmu *pmu); /* optional */
622 * If ->start_txn() disabled the ->add() schedulability test
623 * then ->commit_txn() is required to perform one. On success
624 * the transaction is closed. On error the transaction is kept
625 * open until ->cancel_txn() is called.
627 int (*commit_txn) (struct pmu *pmu); /* optional */
629 * Will cancel the transaction, assumes ->del() is called
630 * for each successfull ->add() during the transaction.
632 void (*cancel_txn) (struct pmu *pmu); /* optional */
636 * enum perf_event_active_state - the states of a event
638 enum perf_event_active_state {
639 PERF_EVENT_STATE_ERROR = -2,
640 PERF_EVENT_STATE_OFF = -1,
641 PERF_EVENT_STATE_INACTIVE = 0,
642 PERF_EVENT_STATE_ACTIVE = 1,
647 #define PERF_BUFFER_WRITABLE 0x01
651 struct rcu_head rcu_head;
652 #ifdef CONFIG_PERF_USE_VMALLOC
653 struct work_struct work;
654 int page_order; /* allocation order */
656 int nr_pages; /* nr of data pages */
657 int writable; /* are we writable */
659 atomic_t poll; /* POLL_ for wakeups */
661 local_t head; /* write position */
662 local_t nest; /* nested writers */
663 local_t events; /* event limit */
664 local_t wakeup; /* wakeup stamp */
665 local_t lost; /* nr records lost */
667 long watermark; /* wakeup watermark */
669 struct perf_event_mmap_page *user_page;
673 struct perf_pending_entry {
674 struct perf_pending_entry *next;
675 void (*func)(struct perf_pending_entry *);
678 struct perf_sample_data;
680 typedef void (*perf_overflow_handler_t)(struct perf_event *, int,
681 struct perf_sample_data *,
682 struct pt_regs *regs);
684 enum perf_group_flag {
685 PERF_GROUP_SOFTWARE = 0x1,
688 #define SWEVENT_HLIST_BITS 8
689 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
691 struct swevent_hlist {
692 struct hlist_head heads[SWEVENT_HLIST_SIZE];
693 struct rcu_head rcu_head;
696 #define PERF_ATTACH_CONTEXT 0x01
697 #define PERF_ATTACH_GROUP 0x02
700 * struct perf_event - performance event kernel representation:
703 #ifdef CONFIG_PERF_EVENTS
704 struct list_head group_entry;
705 struct list_head event_entry;
706 struct list_head sibling_list;
707 struct hlist_node hlist_entry;
710 struct perf_event *group_leader;
713 enum perf_event_active_state state;
714 unsigned int attach_state;
716 atomic64_t child_count;
719 * These are the total time in nanoseconds that the event
720 * has been enabled (i.e. eligible to run, and the task has
721 * been scheduled in, if this is a per-task event)
722 * and running (scheduled onto the CPU), respectively.
724 * They are computed from tstamp_enabled, tstamp_running and
725 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
727 u64 total_time_enabled;
728 u64 total_time_running;
731 * These are timestamps used for computing total_time_enabled
732 * and total_time_running when the event is in INACTIVE or
733 * ACTIVE state, measured in nanoseconds from an arbitrary point
735 * tstamp_enabled: the notional time when the event was enabled
736 * tstamp_running: the notional time when the event was scheduled on
737 * tstamp_stopped: in INACTIVE state, the notional time when the
738 * event was scheduled off.
744 struct perf_event_attr attr;
745 struct hw_perf_event hw;
747 struct perf_event_context *ctx;
751 * These accumulate total time (in nanoseconds) that children
752 * events have been enabled and running, respectively.
754 atomic64_t child_total_time_enabled;
755 atomic64_t child_total_time_running;
758 * Protect attach/detach and child_list:
760 struct mutex child_mutex;
761 struct list_head child_list;
762 struct perf_event *parent;
767 struct list_head owner_entry;
768 struct task_struct *owner;
771 struct mutex mmap_mutex;
774 struct user_struct *mmap_user;
775 struct perf_buffer *buffer;
778 wait_queue_head_t waitq;
779 struct fasync_struct *fasync;
781 /* delayed work for NMIs and such */
785 struct perf_pending_entry pending;
787 atomic_t event_limit;
789 void (*destroy)(struct perf_event *);
790 struct rcu_head rcu_head;
792 struct pid_namespace *ns;
795 perf_overflow_handler_t overflow_handler;
797 #ifdef CONFIG_EVENT_TRACING
798 struct ftrace_event_call *tp_event;
799 struct event_filter *filter;
802 #endif /* CONFIG_PERF_EVENTS */
806 * struct perf_event_context - event context structure
808 * Used as a container for task events and CPU events as well:
810 struct perf_event_context {
812 * Protect the states of the events in the list,
813 * nr_active, and the list:
817 * Protect the list of events. Locking either mutex or lock
818 * is sufficient to ensure the list doesn't change; to change
819 * the list you need to lock both the mutex and the spinlock.
823 struct list_head pinned_groups;
824 struct list_head flexible_groups;
825 struct list_head event_list;
831 struct task_struct *task;
834 * Context clock, runs when context enabled.
840 * These fields let us detect when two contexts have both
841 * been cloned (inherited) from a common ancestor.
843 struct perf_event_context *parent_ctx;
847 struct rcu_head rcu_head;
851 * Number of contexts where an event can trigger:
852 * task, softirq, hardirq, nmi.
854 #define PERF_NR_CONTEXTS 4
857 * struct perf_event_cpu_context - per cpu event context structure
859 struct perf_cpu_context {
860 struct perf_event_context ctx;
861 struct perf_event_context *task_ctx;
865 struct swevent_hlist *swevent_hlist;
866 struct mutex hlist_mutex;
869 /* Recursion avoidance in each contexts */
870 int recursion[PERF_NR_CONTEXTS];
873 struct perf_output_handle {
874 struct perf_event *event;
875 struct perf_buffer *buffer;
876 unsigned long wakeup;
884 #ifdef CONFIG_PERF_EVENTS
887 * Set by architecture code:
889 extern int perf_max_events;
891 extern int perf_pmu_register(struct pmu *pmu);
892 extern void perf_pmu_unregister(struct pmu *pmu);
894 extern void perf_event_task_sched_in(struct task_struct *task);
895 extern void perf_event_task_sched_out(struct task_struct *task, struct task_struct *next);
896 extern void perf_event_task_tick(struct task_struct *task);
897 extern int perf_event_init_task(struct task_struct *child);
898 extern void perf_event_exit_task(struct task_struct *child);
899 extern void perf_event_free_task(struct task_struct *task);
900 extern void set_perf_event_pending(void);
901 extern void perf_event_do_pending(void);
902 extern void perf_event_print_debug(void);
903 extern void perf_pmu_disable(struct pmu *pmu);
904 extern void perf_pmu_enable(struct pmu *pmu);
905 extern int perf_event_task_disable(void);
906 extern int perf_event_task_enable(void);
907 extern void perf_event_update_userpage(struct perf_event *event);
908 extern int perf_event_release_kernel(struct perf_event *event);
909 extern struct perf_event *
910 perf_event_create_kernel_counter(struct perf_event_attr *attr,
913 perf_overflow_handler_t callback);
914 extern u64 perf_event_read_value(struct perf_event *event,
915 u64 *enabled, u64 *running);
917 struct perf_sample_data {
934 struct perf_callchain_entry *callchain;
935 struct perf_raw_record *raw;
939 void perf_sample_data_init(struct perf_sample_data *data, u64 addr)
945 extern void perf_output_sample(struct perf_output_handle *handle,
946 struct perf_event_header *header,
947 struct perf_sample_data *data,
948 struct perf_event *event);
949 extern void perf_prepare_sample(struct perf_event_header *header,
950 struct perf_sample_data *data,
951 struct perf_event *event,
952 struct pt_regs *regs);
954 extern int perf_event_overflow(struct perf_event *event, int nmi,
955 struct perf_sample_data *data,
956 struct pt_regs *regs);
959 * Return 1 for a software event, 0 for a hardware event
961 static inline int is_software_event(struct perf_event *event)
963 switch (event->attr.type) {
964 case PERF_TYPE_SOFTWARE:
965 case PERF_TYPE_TRACEPOINT:
966 /* for now the breakpoint stuff also works as software event */
967 case PERF_TYPE_BREAKPOINT:
973 extern atomic_t perf_swevent_enabled[PERF_COUNT_SW_MAX];
975 extern void __perf_sw_event(u32, u64, int, struct pt_regs *, u64);
977 #ifndef perf_arch_fetch_caller_regs
979 perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
983 * Take a snapshot of the regs. Skip ip and frame pointer to
984 * the nth caller. We only need a few of the regs:
985 * - ip for PERF_SAMPLE_IP
986 * - cs for user_mode() tests
987 * - bp for callchains
988 * - eflags, for future purposes, just in case
990 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
992 memset(regs, 0, sizeof(*regs));
994 perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
998 perf_sw_event(u32 event_id, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
1000 if (atomic_read(&perf_swevent_enabled[event_id])) {
1001 struct pt_regs hot_regs;
1004 perf_fetch_caller_regs(&hot_regs);
1007 __perf_sw_event(event_id, nr, nmi, regs, addr);
1011 extern void perf_event_mmap(struct vm_area_struct *vma);
1012 extern struct perf_guest_info_callbacks *perf_guest_cbs;
1013 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
1014 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
1016 extern void perf_event_comm(struct task_struct *tsk);
1017 extern void perf_event_fork(struct task_struct *tsk);
1020 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
1022 extern void perf_callchain_user(struct perf_callchain_entry *entry,
1023 struct pt_regs *regs);
1024 extern void perf_callchain_kernel(struct perf_callchain_entry *entry,
1025 struct pt_regs *regs);
1029 perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
1031 if (entry->nr < PERF_MAX_STACK_DEPTH)
1032 entry->ip[entry->nr++] = ip;
1035 extern int sysctl_perf_event_paranoid;
1036 extern int sysctl_perf_event_mlock;
1037 extern int sysctl_perf_event_sample_rate;
1039 static inline bool perf_paranoid_tracepoint_raw(void)
1041 return sysctl_perf_event_paranoid > -1;
1044 static inline bool perf_paranoid_cpu(void)
1046 return sysctl_perf_event_paranoid > 0;
1049 static inline bool perf_paranoid_kernel(void)
1051 return sysctl_perf_event_paranoid > 1;
1054 extern void perf_event_init(void);
1055 extern void perf_tp_event(u64 addr, u64 count, void *record,
1056 int entry_size, struct pt_regs *regs,
1057 struct hlist_head *head, int rctx);
1058 extern void perf_bp_event(struct perf_event *event, void *data);
1060 #ifndef perf_misc_flags
1061 #define perf_misc_flags(regs) (user_mode(regs) ? PERF_RECORD_MISC_USER : \
1062 PERF_RECORD_MISC_KERNEL)
1063 #define perf_instruction_pointer(regs) instruction_pointer(regs)
1066 extern int perf_output_begin(struct perf_output_handle *handle,
1067 struct perf_event *event, unsigned int size,
1068 int nmi, int sample);
1069 extern void perf_output_end(struct perf_output_handle *handle);
1070 extern void perf_output_copy(struct perf_output_handle *handle,
1071 const void *buf, unsigned int len);
1072 extern int perf_swevent_get_recursion_context(void);
1073 extern void perf_swevent_put_recursion_context(int rctx);
1074 extern void perf_event_enable(struct perf_event *event);
1075 extern void perf_event_disable(struct perf_event *event);
1078 perf_event_task_sched_in(struct task_struct *task) { }
1080 perf_event_task_sched_out(struct task_struct *task,
1081 struct task_struct *next) { }
1083 perf_event_task_tick(struct task_struct *task) { }
1084 static inline int perf_event_init_task(struct task_struct *child) { return 0; }
1085 static inline void perf_event_exit_task(struct task_struct *child) { }
1086 static inline void perf_event_free_task(struct task_struct *task) { }
1087 static inline void perf_event_do_pending(void) { }
1088 static inline void perf_event_print_debug(void) { }
1089 static inline int perf_event_task_disable(void) { return -EINVAL; }
1090 static inline int perf_event_task_enable(void) { return -EINVAL; }
1093 perf_sw_event(u32 event_id, u64 nr, int nmi,
1094 struct pt_regs *regs, u64 addr) { }
1096 perf_bp_event(struct perf_event *event, void *data) { }
1098 static inline int perf_register_guest_info_callbacks
1099 (struct perf_guest_info_callbacks *callbacks) { return 0; }
1100 static inline int perf_unregister_guest_info_callbacks
1101 (struct perf_guest_info_callbacks *callbacks) { return 0; }
1103 static inline void perf_event_mmap(struct vm_area_struct *vma) { }
1104 static inline void perf_event_comm(struct task_struct *tsk) { }
1105 static inline void perf_event_fork(struct task_struct *tsk) { }
1106 static inline void perf_event_init(void) { }
1107 static inline int perf_swevent_get_recursion_context(void) { return -1; }
1108 static inline void perf_swevent_put_recursion_context(int rctx) { }
1109 static inline void perf_event_enable(struct perf_event *event) { }
1110 static inline void perf_event_disable(struct perf_event *event) { }
1113 #define perf_output_put(handle, x) \
1114 perf_output_copy((handle), &(x), sizeof(x))
1117 * This has to have a higher priority than migration_notifier in sched.c.
1119 #define perf_cpu_notifier(fn) \
1121 static struct notifier_block fn##_nb __cpuinitdata = \
1122 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
1123 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
1124 (void *)(unsigned long)smp_processor_id()); \
1125 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
1126 (void *)(unsigned long)smp_processor_id()); \
1127 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
1128 (void *)(unsigned long)smp_processor_id()); \
1129 register_cpu_notifier(&fn##_nb); \
1132 #endif /* __KERNEL__ */
1133 #endif /* _LINUX_PERF_EVENT_H */