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perf stat: Remove use of die/exit and handle errors
[linux-2.6/btrfs-unstable.git] / include / linux / perf_event.h
blob28f9cee3fbc36bee66b2c0863f3482833767d0d9
1 /*
2 * Performance events:
3 *
4 * Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
5 * Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar
6 * Copyright (C) 2008-2011, Red Hat, Inc., Peter Zijlstra
7 *
8 * Data type definitions, declarations, prototypes.
9 *
10 * Started by: Thomas Gleixner and Ingo Molnar
11 *
12 * For licencing details see kernel-base/COPYING
13 */
14 #ifndef _LINUX_PERF_EVENT_H
15 #define _LINUX_PERF_EVENT_H
16
17 #include <linux/types.h>
18 #include <linux/ioctl.h>
19 #include <asm/byteorder.h>
20
21 /*
22 * User-space ABI bits:
23 */
24
25 /*
26 * attr.type
27 */
28 enum perf_type_id {
29 PERF_TYPE_HARDWARE = 0,
30 PERF_TYPE_SOFTWARE = 1,
31 PERF_TYPE_TRACEPOINT = 2,
32 PERF_TYPE_HW_CACHE = 3,
33 PERF_TYPE_RAW = 4,
34 PERF_TYPE_BREAKPOINT = 5,
35
36 PERF_TYPE_MAX, /* non-ABI */
37 };
38
39 /*
40 * Generalized performance event event_id types, used by the
41 * attr.event_id parameter of the sys_perf_event_open()
42 * syscall:
43 */
44 enum perf_hw_id {
45 /*
46 * Common hardware events, generalized by the kernel:
47 */
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,
55 PERF_COUNT_HW_STALLED_CYCLES_FRONTEND = 7,
56 PERF_COUNT_HW_STALLED_CYCLES_BACKEND = 8,
57 PERF_COUNT_HW_REF_CPU_CYCLES = 9,
58
59 PERF_COUNT_HW_MAX, /* non-ABI */
60 };
61
62 /*
63 * Generalized hardware cache events:
64 *
65 * { L1-D, L1-I, LLC, ITLB, DTLB, BPU, NODE } x
66 * { read, write, prefetch } x
67 * { accesses, misses }
68 */
69 enum perf_hw_cache_id {
70 PERF_COUNT_HW_CACHE_L1D = 0,
71 PERF_COUNT_HW_CACHE_L1I = 1,
72 PERF_COUNT_HW_CACHE_LL = 2,
73 PERF_COUNT_HW_CACHE_DTLB = 3,
74 PERF_COUNT_HW_CACHE_ITLB = 4,
75 PERF_COUNT_HW_CACHE_BPU = 5,
76 PERF_COUNT_HW_CACHE_NODE = 6,
77
78 PERF_COUNT_HW_CACHE_MAX, /* non-ABI */
79 };
80
81 enum perf_hw_cache_op_id {
82 PERF_COUNT_HW_CACHE_OP_READ = 0,
83 PERF_COUNT_HW_CACHE_OP_WRITE = 1,
84 PERF_COUNT_HW_CACHE_OP_PREFETCH = 2,
85
86 PERF_COUNT_HW_CACHE_OP_MAX, /* non-ABI */
87 };
88
89 enum perf_hw_cache_op_result_id {
90 PERF_COUNT_HW_CACHE_RESULT_ACCESS = 0,
91 PERF_COUNT_HW_CACHE_RESULT_MISS = 1,
92
93 PERF_COUNT_HW_CACHE_RESULT_MAX, /* non-ABI */
94 };
95
96 /*
97 * Special "software" events provided by the kernel, even if the hardware
98 * does not support performance events. These events measure various
99 * physical and sw events of the kernel (and allow the profiling of them as
100 * well):
101 */
102 enum perf_sw_ids {
103 PERF_COUNT_SW_CPU_CLOCK = 0,
104 PERF_COUNT_SW_TASK_CLOCK = 1,
105 PERF_COUNT_SW_PAGE_FAULTS = 2,
106 PERF_COUNT_SW_CONTEXT_SWITCHES = 3,
107 PERF_COUNT_SW_CPU_MIGRATIONS = 4,
108 PERF_COUNT_SW_PAGE_FAULTS_MIN = 5,
109 PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6,
110 PERF_COUNT_SW_ALIGNMENT_FAULTS = 7,
111 PERF_COUNT_SW_EMULATION_FAULTS = 8,
112
113 PERF_COUNT_SW_MAX, /* non-ABI */
114 };
115
116 /*
117 * Bits that can be set in attr.sample_type to request information
118 * in the overflow packets.
119 */
120 enum perf_event_sample_format {
121 PERF_SAMPLE_IP = 1U << 0,
122 PERF_SAMPLE_TID = 1U << 1,
123 PERF_SAMPLE_TIME = 1U << 2,
124 PERF_SAMPLE_ADDR = 1U << 3,
125 PERF_SAMPLE_READ = 1U << 4,
126 PERF_SAMPLE_CALLCHAIN = 1U << 5,
127 PERF_SAMPLE_ID = 1U << 6,
128 PERF_SAMPLE_CPU = 1U << 7,
129 PERF_SAMPLE_PERIOD = 1U << 8,
130 PERF_SAMPLE_STREAM_ID = 1U << 9,
131 PERF_SAMPLE_RAW = 1U << 10,
132 PERF_SAMPLE_BRANCH_STACK = 1U << 11,
133 PERF_SAMPLE_REGS_USER = 1U << 12,
134 PERF_SAMPLE_STACK_USER = 1U << 13,
135
136 PERF_SAMPLE_MAX = 1U << 14, /* non-ABI */
137 };
138
139 /*
140 * values to program into branch_sample_type when PERF_SAMPLE_BRANCH is set
141 *
142 * If the user does not pass priv level information via branch_sample_type,
143 * the kernel uses the event's priv level. Branch and event priv levels do
144 * not have to match. Branch priv level is checked for permissions.
145 *
146 * The branch types can be combined, however BRANCH_ANY covers all types
147 * of branches and therefore it supersedes all the other types.
148 */
149 enum perf_branch_sample_type {
150 PERF_SAMPLE_BRANCH_USER = 1U << 0, /* user branches */
151 PERF_SAMPLE_BRANCH_KERNEL = 1U << 1, /* kernel branches */
152 PERF_SAMPLE_BRANCH_HV = 1U << 2, /* hypervisor branches */
153
154 PERF_SAMPLE_BRANCH_ANY = 1U << 3, /* any branch types */
155 PERF_SAMPLE_BRANCH_ANY_CALL = 1U << 4, /* any call branch */
156 PERF_SAMPLE_BRANCH_ANY_RETURN = 1U << 5, /* any return branch */
157 PERF_SAMPLE_BRANCH_IND_CALL = 1U << 6, /* indirect calls */
158
159 PERF_SAMPLE_BRANCH_MAX = 1U << 7, /* non-ABI */
160 };
161
162 #define PERF_SAMPLE_BRANCH_PLM_ALL \
163 (PERF_SAMPLE_BRANCH_USER|\
164 PERF_SAMPLE_BRANCH_KERNEL|\
165 PERF_SAMPLE_BRANCH_HV)
166
167 /*
168 * Values to determine ABI of the registers dump.
169 */
170 enum perf_sample_regs_abi {
171 PERF_SAMPLE_REGS_ABI_NONE = 0,
172 PERF_SAMPLE_REGS_ABI_32 = 1,
173 PERF_SAMPLE_REGS_ABI_64 = 2,
174 };
175
176 /*
177 * The format of the data returned by read() on a perf event fd,
178 * as specified by attr.read_format:
179 *
180 * struct read_format {
181 * { u64 value;
182 * { u64 time_enabled; } && PERF_FORMAT_TOTAL_TIME_ENABLED
183 * { u64 time_running; } && PERF_FORMAT_TOTAL_TIME_RUNNING
184 * { u64 id; } && PERF_FORMAT_ID
185 * } && !PERF_FORMAT_GROUP
186 *
187 * { u64 nr;
188 * { u64 time_enabled; } && PERF_FORMAT_TOTAL_TIME_ENABLED
189 * { u64 time_running; } && PERF_FORMAT_TOTAL_TIME_RUNNING
190 * { u64 value;
191 * { u64 id; } && PERF_FORMAT_ID
192 * } cntr[nr];
193 * } && PERF_FORMAT_GROUP
194 * };
195 */
196 enum perf_event_read_format {
197 PERF_FORMAT_TOTAL_TIME_ENABLED = 1U << 0,
198 PERF_FORMAT_TOTAL_TIME_RUNNING = 1U << 1,
199 PERF_FORMAT_ID = 1U << 2,
200 PERF_FORMAT_GROUP = 1U << 3,
201
202 PERF_FORMAT_MAX = 1U << 4, /* non-ABI */
203 };
204
205 #define PERF_ATTR_SIZE_VER0 64 /* sizeof first published struct */
206 #define PERF_ATTR_SIZE_VER1 72 /* add: config2 */
207 #define PERF_ATTR_SIZE_VER2 80 /* add: branch_sample_type */
208 #define PERF_ATTR_SIZE_VER3 96 /* add: sample_regs_user */
209 /* add: sample_stack_user */
210
211 /*
212 * Hardware event_id to monitor via a performance monitoring event:
213 */
214 struct perf_event_attr {
215
216 /*
217 * Major type: hardware/software/tracepoint/etc.
218 */
219 __u32 type;
220
221 /*
222 * Size of the attr structure, for fwd/bwd compat.
223 */
224 __u32 size;
225
226 /*
227 * Type specific configuration information.
228 */
229 __u64 config;
230
231 union {
232 __u64 sample_period;
233 __u64 sample_freq;
234 };
235
236 __u64 sample_type;
237 __u64 read_format;
238
239 __u64 disabled : 1, /* off by default */
240 inherit : 1, /* children inherit it */
241 pinned : 1, /* must always be on PMU */
242 exclusive : 1, /* only group on PMU */
243 exclude_user : 1, /* don't count user */
244 exclude_kernel : 1, /* ditto kernel */
245 exclude_hv : 1, /* ditto hypervisor */
246 exclude_idle : 1, /* don't count when idle */
247 mmap : 1, /* include mmap data */
248 comm : 1, /* include comm data */
249 freq : 1, /* use freq, not period */
250 inherit_stat : 1, /* per task counts */
251 enable_on_exec : 1, /* next exec enables */
252 task : 1, /* trace fork/exit */
253 watermark : 1, /* wakeup_watermark */
254 /*
255 * precise_ip:
256 *
257 * 0 - SAMPLE_IP can have arbitrary skid
258 * 1 - SAMPLE_IP must have constant skid
259 * 2 - SAMPLE_IP requested to have 0 skid
260 * 3 - SAMPLE_IP must have 0 skid
261 *
262 * See also PERF_RECORD_MISC_EXACT_IP
263 */
264 precise_ip : 2, /* skid constraint */
265 mmap_data : 1, /* non-exec mmap data */
266 sample_id_all : 1, /* sample_type all events */
267
268 exclude_host : 1, /* don't count in host */
269 exclude_guest : 1, /* don't count in guest */
270
271 exclude_callchain_kernel : 1, /* exclude kernel callchains */
272 exclude_callchain_user : 1, /* exclude user callchains */
273
274 __reserved_1 : 41;
275
276 union {
277 __u32 wakeup_events; /* wakeup every n events */
278 __u32 wakeup_watermark; /* bytes before wakeup */
279 };
280
281 __u32 bp_type;
282 union {
283 __u64 bp_addr;
284 __u64 config1; /* extension of config */
285 };
286 union {
287 __u64 bp_len;
288 __u64 config2; /* extension of config1 */
289 };
290 __u64 branch_sample_type; /* enum perf_branch_sample_type */
291
292 /*
293 * Defines set of user regs to dump on samples.
294 * See asm/perf_regs.h for details.
295 */
296 __u64 sample_regs_user;
297
298 /*
299 * Defines size of the user stack to dump on samples.
300 */
301 __u32 sample_stack_user;
302
303 /* Align to u64. */
304 __u32 __reserved_2;
305 };
306
307 /*
308 * Ioctls that can be done on a perf event fd:
309 */
310 #define PERF_EVENT_IOC_ENABLE _IO ('$', 0)
311 #define PERF_EVENT_IOC_DISABLE _IO ('$', 1)
312 #define PERF_EVENT_IOC_REFRESH _IO ('$', 2)
313 #define PERF_EVENT_IOC_RESET _IO ('$', 3)
314 #define PERF_EVENT_IOC_PERIOD _IOW('$', 4, __u64)
315 #define PERF_EVENT_IOC_SET_OUTPUT _IO ('$', 5)
316 #define PERF_EVENT_IOC_SET_FILTER _IOW('$', 6, char *)
317
318 enum perf_event_ioc_flags {
319 PERF_IOC_FLAG_GROUP = 1U << 0,
320 };
321
322 /*
323 * Structure of the page that can be mapped via mmap
324 */
325 struct perf_event_mmap_page {
326 __u32 version; /* version number of this structure */
327 __u32 compat_version; /* lowest version this is compat with */
328
329 /*
330 * Bits needed to read the hw events in user-space.
331 *
332 * u32 seq, time_mult, time_shift, idx, width;
333 * u64 count, enabled, running;
334 * u64 cyc, time_offset;
335 * s64 pmc = 0;
336 *
337 * do {
338 * seq = pc->lock;
339 * barrier()
340 *
341 * enabled = pc->time_enabled;
342 * running = pc->time_running;
343 *
344 * if (pc->cap_usr_time && enabled != running) {
345 * cyc = rdtsc();
346 * time_offset = pc->time_offset;
347 * time_mult = pc->time_mult;
348 * time_shift = pc->time_shift;
349 * }
350 *
351 * idx = pc->index;
352 * count = pc->offset;
353 * if (pc->cap_usr_rdpmc && idx) {
354 * width = pc->pmc_width;
355 * pmc = rdpmc(idx - 1);
356 * }
357 *
358 * barrier();
359 * } while (pc->lock != seq);
360 *
361 * NOTE: for obvious reason this only works on self-monitoring
362 * processes.
363 */
364 __u32 lock; /* seqlock for synchronization */
365 __u32 index; /* hardware event identifier */
366 __s64 offset; /* add to hardware event value */
367 __u64 time_enabled; /* time event active */
368 __u64 time_running; /* time event on cpu */
369 union {
370 __u64 capabilities;
371 __u64 cap_usr_time : 1,
372 cap_usr_rdpmc : 1,
373 cap_____res : 62;
374 };
375
376 /*
377 * If cap_usr_rdpmc this field provides the bit-width of the value
378 * read using the rdpmc() or equivalent instruction. This can be used
379 * to sign extend the result like:
380 *
381 * pmc <<= 64 - width;
382 * pmc >>= 64 - width; // signed shift right
383 * count += pmc;
384 */
385 __u16 pmc_width;
386
387 /*
388 * If cap_usr_time the below fields can be used to compute the time
389 * delta since time_enabled (in ns) using rdtsc or similar.
390 *
391 * u64 quot, rem;
392 * u64 delta;
393 *
394 * quot = (cyc >> time_shift);
395 * rem = cyc & ((1 << time_shift) - 1);
396 * delta = time_offset + quot * time_mult +
397 * ((rem * time_mult) >> time_shift);
398 *
399 * Where time_offset,time_mult,time_shift and cyc are read in the
400 * seqcount loop described above. This delta can then be added to
401 * enabled and possible running (if idx), improving the scaling:
402 *
403 * enabled += delta;
404 * if (idx)
405 * running += delta;
406 *
407 * quot = count / running;
408 * rem = count % running;
409 * count = quot * enabled + (rem * enabled) / running;
410 */
411 __u16 time_shift;
412 __u32 time_mult;
413 __u64 time_offset;
414
415 /*
416 * Hole for extension of the self monitor capabilities
417 */
418
419 __u64 __reserved[120]; /* align to 1k */
420
421 /*
422 * Control data for the mmap() data buffer.
423 *
424 * User-space reading the @data_head value should issue an rmb(), on
425 * SMP capable platforms, after reading this value -- see
426 * perf_event_wakeup().
427 *
428 * When the mapping is PROT_WRITE the @data_tail value should be
429 * written by userspace to reflect the last read data. In this case
430 * the kernel will not over-write unread data.
431 */
432 __u64 data_head; /* head in the data section */
433 __u64 data_tail; /* user-space written tail */
434 };
435
436 #define PERF_RECORD_MISC_CPUMODE_MASK (7 << 0)
437 #define PERF_RECORD_MISC_CPUMODE_UNKNOWN (0 << 0)
438 #define PERF_RECORD_MISC_KERNEL (1 << 0)
439 #define PERF_RECORD_MISC_USER (2 << 0)
440 #define PERF_RECORD_MISC_HYPERVISOR (3 << 0)
441 #define PERF_RECORD_MISC_GUEST_KERNEL (4 << 0)
442 #define PERF_RECORD_MISC_GUEST_USER (5 << 0)
443
444 /*
445 * Indicates that the content of PERF_SAMPLE_IP points to
446 * the actual instruction that triggered the event. See also
447 * perf_event_attr::precise_ip.
448 */
449 #define PERF_RECORD_MISC_EXACT_IP (1 << 14)
450 /*
451 * Reserve the last bit to indicate some extended misc field
452 */
453 #define PERF_RECORD_MISC_EXT_RESERVED (1 << 15)
454
455 struct perf_event_header {
456 __u32 type;
457 __u16 misc;
458 __u16 size;
459 };
460
461 enum perf_event_type {
462
463 /*
464 * If perf_event_attr.sample_id_all is set then all event types will
465 * have the sample_type selected fields related to where/when
466 * (identity) an event took place (TID, TIME, ID, CPU, STREAM_ID)
467 * described in PERF_RECORD_SAMPLE below, it will be stashed just after
468 * the perf_event_header and the fields already present for the existing
469 * fields, i.e. at the end of the payload. That way a newer perf.data
470 * file will be supported by older perf tools, with these new optional
471 * fields being ignored.
472 *
473 * The MMAP events record the PROT_EXEC mappings so that we can
474 * correlate userspace IPs to code. They have the following structure:
475 *
476 * struct {
477 * struct perf_event_header header;
478 *
479 * u32 pid, tid;
480 * u64 addr;
481 * u64 len;
482 * u64 pgoff;
483 * char filename[];
484 * };
485 */
486 PERF_RECORD_MMAP = 1,
487
488 /*
489 * struct {
490 * struct perf_event_header header;
491 * u64 id;
492 * u64 lost;
493 * };
494 */
495 PERF_RECORD_LOST = 2,
496
497 /*
498 * struct {
499 * struct perf_event_header header;
500 *
501 * u32 pid, tid;
502 * char comm[];
503 * };
504 */
505 PERF_RECORD_COMM = 3,
506
507 /*
508 * struct {
509 * struct perf_event_header header;
510 * u32 pid, ppid;
511 * u32 tid, ptid;
512 * u64 time;
513 * };
514 */
515 PERF_RECORD_EXIT = 4,
516
517 /*
518 * struct {
519 * struct perf_event_header header;
520 * u64 time;
521 * u64 id;
522 * u64 stream_id;
523 * };
524 */
525 PERF_RECORD_THROTTLE = 5,
526 PERF_RECORD_UNTHROTTLE = 6,
527
528 /*
529 * struct {
530 * struct perf_event_header header;
531 * u32 pid, ppid;
532 * u32 tid, ptid;
533 * u64 time;
534 * };
535 */
536 PERF_RECORD_FORK = 7,
537
538 /*
539 * struct {
540 * struct perf_event_header header;
541 * u32 pid, tid;
542 *
543 * struct read_format values;
544 * };
545 */
546 PERF_RECORD_READ = 8,
547
548 /*
549 * struct {
550 * struct perf_event_header header;
551 *
552 * { u64 ip; } && PERF_SAMPLE_IP
553 * { u32 pid, tid; } && PERF_SAMPLE_TID
554 * { u64 time; } && PERF_SAMPLE_TIME
555 * { u64 addr; } && PERF_SAMPLE_ADDR
556 * { u64 id; } && PERF_SAMPLE_ID
557 * { u64 stream_id;} && PERF_SAMPLE_STREAM_ID
558 * { u32 cpu, res; } && PERF_SAMPLE_CPU
559 * { u64 period; } && PERF_SAMPLE_PERIOD
560 *
561 * { struct read_format values; } && PERF_SAMPLE_READ
562 *
563 * { u64 nr,
564 * u64 ips[nr]; } && PERF_SAMPLE_CALLCHAIN
565 *
566 * #
567 * # The RAW record below is opaque data wrt the ABI
568 * #
569 * # That is, the ABI doesn't make any promises wrt to
570 * # the stability of its content, it may vary depending
571 * # on event, hardware, kernel version and phase of
572 * # the moon.
573 * #
574 * # In other words, PERF_SAMPLE_RAW contents are not an ABI.
575 * #
576 *
577 * { u32 size;
578 * char data[size];}&& PERF_SAMPLE_RAW
579 *
580 * { u64 from, to, flags } lbr[nr];} && PERF_SAMPLE_BRANCH_STACK
581 *
582 * { u64 abi; # enum perf_sample_regs_abi
583 * u64 regs[weight(mask)]; } && PERF_SAMPLE_REGS_USER
584 *
585 * { u64 size;
586 * char data[size];
587 * u64 dyn_size; } && PERF_SAMPLE_STACK_USER
588 * };
589 */
590 PERF_RECORD_SAMPLE = 9,
591
592 PERF_RECORD_MAX, /* non-ABI */
593 };
594
595 #define PERF_MAX_STACK_DEPTH 127
596
597 enum perf_callchain_context {
598 PERF_CONTEXT_HV = (__u64)-32,
599 PERF_CONTEXT_KERNEL = (__u64)-128,
600 PERF_CONTEXT_USER = (__u64)-512,
601
602 PERF_CONTEXT_GUEST = (__u64)-2048,
603 PERF_CONTEXT_GUEST_KERNEL = (__u64)-2176,
604 PERF_CONTEXT_GUEST_USER = (__u64)-2560,
605
606 PERF_CONTEXT_MAX = (__u64)-4095,
607 };
608
609 #define PERF_FLAG_FD_NO_GROUP (1U << 0)
610 #define PERF_FLAG_FD_OUTPUT (1U << 1)
611 #define PERF_FLAG_PID_CGROUP (1U << 2) /* pid=cgroup id, per-cpu mode only */
612
613 #ifdef __KERNEL__
614 /*
615 * Kernel-internal data types and definitions:
616 */
617
618 #ifdef CONFIG_PERF_EVENTS
619 # include <linux/cgroup.h>
620 # include <asm/perf_event.h>
621 # include <asm/local64.h>
622 #endif
623
624 struct perf_guest_info_callbacks {
625 int (*is_in_guest)(void);
626 int (*is_user_mode)(void);
627 unsigned long (*get_guest_ip)(void);
628 };
629
630 #ifdef CONFIG_HAVE_HW_BREAKPOINT
631 #include <asm/hw_breakpoint.h>
632 #endif
633
634 #include <linux/list.h>
635 #include <linux/mutex.h>
636 #include <linux/rculist.h>
637 #include <linux/rcupdate.h>
638 #include <linux/spinlock.h>
639 #include <linux/hrtimer.h>
640 #include <linux/fs.h>
641 #include <linux/pid_namespace.h>
642 #include <linux/workqueue.h>
643 #include <linux/ftrace.h>
644 #include <linux/cpu.h>
645 #include <linux/irq_work.h>
646 #include <linux/static_key.h>
647 #include <linux/atomic.h>
648 #include <linux/sysfs.h>
649 #include <linux/perf_regs.h>
650 #include <asm/local.h>
651
652 struct perf_callchain_entry {
653 __u64 nr;
654 __u64 ip[PERF_MAX_STACK_DEPTH];
655 };
656
657 struct perf_raw_record {
658 u32 size;
659 void *data;
660 };
661
662 /*
663 * single taken branch record layout:
664 *
665 * from: source instruction (may not always be a branch insn)
666 * to: branch target
667 * mispred: branch target was mispredicted
668 * predicted: branch target was predicted
669 *
670 * support for mispred, predicted is optional. In case it
671 * is not supported mispred = predicted = 0.
672 */
673 struct perf_branch_entry {
674 __u64 from;
675 __u64 to;
676 __u64 mispred:1, /* target mispredicted */
677 predicted:1,/* target predicted */
678 reserved:62;
679 };
680
681 /*
682 * branch stack layout:
683 * nr: number of taken branches stored in entries[]
684 *
685 * Note that nr can vary from sample to sample
686 * branches (to, from) are stored from most recent
687 * to least recent, i.e., entries[0] contains the most
688 * recent branch.
689 */
690 struct perf_branch_stack {
691 __u64 nr;
692 struct perf_branch_entry entries[0];
693 };
694
695 struct perf_regs_user {
696 __u64 abi;
697 struct pt_regs *regs;
698 };
699
700 struct task_struct;
701
702 /*
703 * extra PMU register associated with an event
704 */
705 struct hw_perf_event_extra {
706 u64 config; /* register value */
707 unsigned int reg; /* register address or index */
708 int alloc; /* extra register already allocated */
709 int idx; /* index in shared_regs->regs[] */
710 };
711
712 /**
713 * struct hw_perf_event - performance event hardware details:
714 */
715 struct hw_perf_event {
716 #ifdef CONFIG_PERF_EVENTS
717 union {
718 struct { /* hardware */
719 u64 config;
720 u64 last_tag;
721 unsigned long config_base;
722 unsigned long event_base;
723 int event_base_rdpmc;
724 int idx;
725 int last_cpu;
726
727 struct hw_perf_event_extra extra_reg;
728 struct hw_perf_event_extra branch_reg;
729 };
730 struct { /* software */
731 struct hrtimer hrtimer;
732 };
733 #ifdef CONFIG_HAVE_HW_BREAKPOINT
734 struct { /* breakpoint */
735 struct arch_hw_breakpoint info;
736 struct list_head bp_list;
737 /*
738 * Crufty hack to avoid the chicken and egg
739 * problem hw_breakpoint has with context
740 * creation and event initalization.
741 */
742 struct task_struct *bp_target;
743 };
744 #endif
745 };
746 int state;
747 local64_t prev_count;
748 u64 sample_period;
749 u64 last_period;
750 local64_t period_left;
751 u64 interrupts_seq;
752 u64 interrupts;
753
754 u64 freq_time_stamp;
755 u64 freq_count_stamp;
756 #endif
757 };
758
759 /*
760 * hw_perf_event::state flags
761 */
762 #define PERF_HES_STOPPED 0x01 /* the counter is stopped */
763 #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
764 #define PERF_HES_ARCH 0x04
765
766 struct perf_event;
767
768 /*
769 * Common implementation detail of pmu::{start,commit,cancel}_txn
770 */
771 #define PERF_EVENT_TXN 0x1
772
773 /**
774 * struct pmu - generic performance monitoring unit
775 */
776 struct pmu {
777 struct list_head entry;
778
779 struct device *dev;
780 const struct attribute_group **attr_groups;
781 char *name;
782 int type;
783
784 int * __percpu pmu_disable_count;
785 struct perf_cpu_context * __percpu pmu_cpu_context;
786 int task_ctx_nr;
787
788 /*
789 * Fully disable/enable this PMU, can be used to protect from the PMI
790 * as well as for lazy/batch writing of the MSRs.
791 */
792 void (*pmu_enable) (struct pmu *pmu); /* optional */
793 void (*pmu_disable) (struct pmu *pmu); /* optional */
794
795 /*
796 * Try and initialize the event for this PMU.
797 * Should return -ENOENT when the @event doesn't match this PMU.
798 */
799 int (*event_init) (struct perf_event *event);
800
801 #define PERF_EF_START 0x01 /* start the counter when adding */
802 #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
803 #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
804
805 /*
806 * Adds/Removes a counter to/from the PMU, can be done inside
807 * a transaction, see the ->*_txn() methods.
808 */
809 int (*add) (struct perf_event *event, int flags);
810 void (*del) (struct perf_event *event, int flags);
811
812 /*
813 * Starts/Stops a counter present on the PMU. The PMI handler
814 * should stop the counter when perf_event_overflow() returns
815 * !0. ->start() will be used to continue.
816 */
817 void (*start) (struct perf_event *event, int flags);
818 void (*stop) (struct perf_event *event, int flags);
819
820 /*
821 * Updates the counter value of the event.
822 */
823 void (*read) (struct perf_event *event);
824
825 /*
826 * Group events scheduling is treated as a transaction, add
827 * group events as a whole and perform one schedulability test.
828 * If the test fails, roll back the whole group
829 *
830 * Start the transaction, after this ->add() doesn't need to
831 * do schedulability tests.
832 */
833 void (*start_txn) (struct pmu *pmu); /* optional */
834 /*
835 * If ->start_txn() disabled the ->add() schedulability test
836 * then ->commit_txn() is required to perform one. On success
837 * the transaction is closed. On error the transaction is kept
838 * open until ->cancel_txn() is called.
839 */
840 int (*commit_txn) (struct pmu *pmu); /* optional */
841 /*
842 * Will cancel the transaction, assumes ->del() is called
843 * for each successful ->add() during the transaction.
844 */
845 void (*cancel_txn) (struct pmu *pmu); /* optional */
846
847 /*
848 * Will return the value for perf_event_mmap_page::index for this event,
849 * if no implementation is provided it will default to: event->hw.idx + 1.
850 */
851 int (*event_idx) (struct perf_event *event); /*optional */
852
853 /*
854 * flush branch stack on context-switches (needed in cpu-wide mode)
855 */
856 void (*flush_branch_stack) (void);
857 };
858
859 /**
860 * enum perf_event_active_state - the states of a event
861 */
862 enum perf_event_active_state {
863 PERF_EVENT_STATE_ERROR = -2,
864 PERF_EVENT_STATE_OFF = -1,
865 PERF_EVENT_STATE_INACTIVE = 0,
866 PERF_EVENT_STATE_ACTIVE = 1,
867 };
868
869 struct file;
870 struct perf_sample_data;
871
872 typedef void (*perf_overflow_handler_t)(struct perf_event *,
873 struct perf_sample_data *,
874 struct pt_regs *regs);
875
876 enum perf_group_flag {
877 PERF_GROUP_SOFTWARE = 0x1,
878 };
879
880 #define SWEVENT_HLIST_BITS 8
881 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
882
883 struct swevent_hlist {
884 struct hlist_head heads[SWEVENT_HLIST_SIZE];
885 struct rcu_head rcu_head;
886 };
887
888 #define PERF_ATTACH_CONTEXT 0x01
889 #define PERF_ATTACH_GROUP 0x02
890 #define PERF_ATTACH_TASK 0x04
891
892 #ifdef CONFIG_CGROUP_PERF
893 /*
894 * perf_cgroup_info keeps track of time_enabled for a cgroup.
895 * This is a per-cpu dynamically allocated data structure.
896 */
897 struct perf_cgroup_info {
898 u64 time;
899 u64 timestamp;
900 };
901
902 struct perf_cgroup {
903 struct cgroup_subsys_state css;
904 struct perf_cgroup_info *info; /* timing info, one per cpu */
905 };
906 #endif
907
908 struct ring_buffer;
909
910 /**
911 * struct perf_event - performance event kernel representation:
912 */
913 struct perf_event {
914 #ifdef CONFIG_PERF_EVENTS
915 struct list_head group_entry;
916 struct list_head event_entry;
917 struct list_head sibling_list;
918 struct hlist_node hlist_entry;
919 int nr_siblings;
920 int group_flags;
921 struct perf_event *group_leader;
922 struct pmu *pmu;
923
924 enum perf_event_active_state state;
925 unsigned int attach_state;
926 local64_t count;
927 atomic64_t child_count;
928
929 /*
930 * These are the total time in nanoseconds that the event
931 * has been enabled (i.e. eligible to run, and the task has
932 * been scheduled in, if this is a per-task event)
933 * and running (scheduled onto the CPU), respectively.
934 *
935 * They are computed from tstamp_enabled, tstamp_running and
936 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
937 */
938 u64 total_time_enabled;
939 u64 total_time_running;
940
941 /*
942 * These are timestamps used for computing total_time_enabled
943 * and total_time_running when the event is in INACTIVE or
944 * ACTIVE state, measured in nanoseconds from an arbitrary point
945 * in time.
946 * tstamp_enabled: the notional time when the event was enabled
947 * tstamp_running: the notional time when the event was scheduled on
948 * tstamp_stopped: in INACTIVE state, the notional time when the
949 * event was scheduled off.
950 */
951 u64 tstamp_enabled;
952 u64 tstamp_running;
953 u64 tstamp_stopped;
954
955 /*
956 * timestamp shadows the actual context timing but it can
957 * be safely used in NMI interrupt context. It reflects the
958 * context time as it was when the event was last scheduled in.
959 *
960 * ctx_time already accounts for ctx->timestamp. Therefore to
961 * compute ctx_time for a sample, simply add perf_clock().
962 */
963 u64 shadow_ctx_time;
964
965 struct perf_event_attr attr;
966 u16 header_size;
967 u16 id_header_size;
968 u16 read_size;
969 struct hw_perf_event hw;
970
971 struct perf_event_context *ctx;
972 struct file *filp;
973
974 /*
975 * These accumulate total time (in nanoseconds) that children
976 * events have been enabled and running, respectively.
977 */
978 atomic64_t child_total_time_enabled;
979 atomic64_t child_total_time_running;
980
981 /*
982 * Protect attach/detach and child_list:
983 */
984 struct mutex child_mutex;
985 struct list_head child_list;
986 struct perf_event *parent;
987
988 int oncpu;
989 int cpu;
990
991 struct list_head owner_entry;
992 struct task_struct *owner;
993
994 /* mmap bits */
995 struct mutex mmap_mutex;
996 atomic_t mmap_count;
997 int mmap_locked;
998 struct user_struct *mmap_user;
999 struct ring_buffer *rb;
1000 struct list_head rb_entry;
1001
1002 /* poll related */
1003 wait_queue_head_t waitq;
1004 struct fasync_struct *fasync;
1005
1006 /* delayed work for NMIs and such */
1007 int pending_wakeup;
1008 int pending_kill;
1009 int pending_disable;
1010 struct irq_work pending;
1011
1012 atomic_t event_limit;
1013
1014 void (*destroy)(struct perf_event *);
1015 struct rcu_head rcu_head;
1016
1017 struct pid_namespace *ns;
1018 u64 id;
1019
1020 perf_overflow_handler_t overflow_handler;
1021 void *overflow_handler_context;
1022
1023 #ifdef CONFIG_EVENT_TRACING
1024 struct ftrace_event_call *tp_event;
1025 struct event_filter *filter;
1026 #ifdef CONFIG_FUNCTION_TRACER
1027 struct ftrace_ops ftrace_ops;
1028 #endif
1029 #endif
1030
1031 #ifdef CONFIG_CGROUP_PERF
1032 struct perf_cgroup *cgrp; /* cgroup event is attach to */
1033 int cgrp_defer_enabled;
1034 #endif
1035
1036 #endif /* CONFIG_PERF_EVENTS */
1037 };
1038
1039 enum perf_event_context_type {
1040 task_context,
1041 cpu_context,
1042 };
1043
1044 /**
1045 * struct perf_event_context - event context structure
1046 *
1047 * Used as a container for task events and CPU events as well:
1048 */
1049 struct perf_event_context {
1050 struct pmu *pmu;
1051 enum perf_event_context_type type;
1052 /*
1053 * Protect the states of the events in the list,
1054 * nr_active, and the list:
1055 */
1056 raw_spinlock_t lock;
1057 /*
1058 * Protect the list of events. Locking either mutex or lock
1059 * is sufficient to ensure the list doesn't change; to change
1060 * the list you need to lock both the mutex and the spinlock.
1061 */
1062 struct mutex mutex;
1063
1064 struct list_head pinned_groups;
1065 struct list_head flexible_groups;
1066 struct list_head event_list;
1067 int nr_events;
1068 int nr_active;
1069 int is_active;
1070 int nr_stat;
1071 int nr_freq;
1072 int rotate_disable;
1073 atomic_t refcount;
1074 struct task_struct *task;
1075
1076 /*
1077 * Context clock, runs when context enabled.
1078 */
1079 u64 time;
1080 u64 timestamp;
1081
1082 /*
1083 * These fields let us detect when two contexts have both
1084 * been cloned (inherited) from a common ancestor.
1085 */
1086 struct perf_event_context *parent_ctx;
1087 u64 parent_gen;
1088 u64 generation;
1089 int pin_count;
1090 int nr_cgroups; /* cgroup evts */
1091 int nr_branch_stack; /* branch_stack evt */
1092 struct rcu_head rcu_head;
1093 };
1094
1095 /*
1096 * Number of contexts where an event can trigger:
1097 * task, softirq, hardirq, nmi.
1098 */
1099 #define PERF_NR_CONTEXTS 4
1100
1101 /**
1102 * struct perf_event_cpu_context - per cpu event context structure
1103 */
1104 struct perf_cpu_context {
1105 struct perf_event_context ctx;
1106 struct perf_event_context *task_ctx;
1107 int active_oncpu;
1108 int exclusive;
1109 struct list_head rotation_list;
1110 int jiffies_interval;
1111 struct pmu *active_pmu;
1112 struct perf_cgroup *cgrp;
1113 };
1114
1115 struct perf_output_handle {
1116 struct perf_event *event;
1117 struct ring_buffer *rb;
1118 unsigned long wakeup;
1119 unsigned long size;
1120 void *addr;
1121 int page;
1122 };
1123
1124 #ifdef CONFIG_PERF_EVENTS
1125
1126 extern int perf_pmu_register(struct pmu *pmu, char *name, int type);
1127 extern void perf_pmu_unregister(struct pmu *pmu);
1128
1129 extern int perf_num_counters(void);
1130 extern const char *perf_pmu_name(void);
1131 extern void __perf_event_task_sched_in(struct task_struct *prev,
1132 struct task_struct *task);
1133 extern void __perf_event_task_sched_out(struct task_struct *prev,
1134 struct task_struct *next);
1135 extern int perf_event_init_task(struct task_struct *child);
1136 extern void perf_event_exit_task(struct task_struct *child);
1137 extern void perf_event_free_task(struct task_struct *task);
1138 extern void perf_event_delayed_put(struct task_struct *task);
1139 extern void perf_event_print_debug(void);
1140 extern void perf_pmu_disable(struct pmu *pmu);
1141 extern void perf_pmu_enable(struct pmu *pmu);
1142 extern int perf_event_task_disable(void);
1143 extern int perf_event_task_enable(void);
1144 extern int perf_event_refresh(struct perf_event *event, int refresh);
1145 extern void perf_event_update_userpage(struct perf_event *event);
1146 extern int perf_event_release_kernel(struct perf_event *event);
1147 extern struct perf_event *
1148 perf_event_create_kernel_counter(struct perf_event_attr *attr,
1149 int cpu,
1150 struct task_struct *task,
1151 perf_overflow_handler_t callback,
1152 void *context);
1153 extern void perf_pmu_migrate_context(struct pmu *pmu,
1154 int src_cpu, int dst_cpu);
1155 extern u64 perf_event_read_value(struct perf_event *event,
1156 u64 *enabled, u64 *running);
1157
1158
1159 struct perf_sample_data {
1160 u64 type;
1161
1162 u64 ip;
1163 struct {
1164 u32 pid;
1165 u32 tid;
1166 } tid_entry;
1167 u64 time;
1168 u64 addr;
1169 u64 id;
1170 u64 stream_id;
1171 struct {
1172 u32 cpu;
1173 u32 reserved;
1174 } cpu_entry;
1175 u64 period;
1176 struct perf_callchain_entry *callchain;
1177 struct perf_raw_record *raw;
1178 struct perf_branch_stack *br_stack;
1179 struct perf_regs_user regs_user;
1180 u64 stack_user_size;
1181 };
1182
1183 static inline void perf_sample_data_init(struct perf_sample_data *data,
1184 u64 addr, u64 period)
1185 {
1186 /* remaining struct members initialized in perf_prepare_sample() */
1187 data->addr = addr;
1188 data->raw = NULL;
1189 data->br_stack = NULL;
1190 data->period = period;
1191 data->regs_user.abi = PERF_SAMPLE_REGS_ABI_NONE;
1192 data->regs_user.regs = NULL;
1193 data->stack_user_size = 0;
1194 }
1195
1196 extern void perf_output_sample(struct perf_output_handle *handle,
1197 struct perf_event_header *header,
1198 struct perf_sample_data *data,
1199 struct perf_event *event);
1200 extern void perf_prepare_sample(struct perf_event_header *header,
1201 struct perf_sample_data *data,
1202 struct perf_event *event,
1203 struct pt_regs *regs);
1204
1205 extern int perf_event_overflow(struct perf_event *event,
1206 struct perf_sample_data *data,
1207 struct pt_regs *regs);
1208
1209 static inline bool is_sampling_event(struct perf_event *event)
1210 {
1211 return event->attr.sample_period != 0;
1212 }
1213
1214 /*
1215 * Return 1 for a software event, 0 for a hardware event
1216 */
1217 static inline int is_software_event(struct perf_event *event)
1218 {
1219 return event->pmu->task_ctx_nr == perf_sw_context;
1220 }
1221
1222 extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
1223
1224 extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
1225
1226 #ifndef perf_arch_fetch_caller_regs
1227 static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
1228 #endif
1229
1230 /*
1231 * Take a snapshot of the regs. Skip ip and frame pointer to
1232 * the nth caller. We only need a few of the regs:
1233 * - ip for PERF_SAMPLE_IP
1234 * - cs for user_mode() tests
1235 * - bp for callchains
1236 * - eflags, for future purposes, just in case
1237 */
1238 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
1239 {
1240 memset(regs, 0, sizeof(*regs));
1241
1242 perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
1243 }
1244
1245 static __always_inline void
1246 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
1247 {
1248 struct pt_regs hot_regs;
1249
1250 if (static_key_false(&perf_swevent_enabled[event_id])) {
1251 if (!regs) {
1252 perf_fetch_caller_regs(&hot_regs);
1253 regs = &hot_regs;
1254 }
1255 __perf_sw_event(event_id, nr, regs, addr);
1256 }
1257 }
1258
1259 extern struct static_key_deferred perf_sched_events;
1260
1261 static inline void perf_event_task_sched_in(struct task_struct *prev,
1262 struct task_struct *task)
1263 {
1264 if (static_key_false(&perf_sched_events.key))
1265 __perf_event_task_sched_in(prev, task);
1266 }
1267
1268 static inline void perf_event_task_sched_out(struct task_struct *prev,
1269 struct task_struct *next)
1270 {
1271 perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, NULL, 0);
1272
1273 if (static_key_false(&perf_sched_events.key))
1274 __perf_event_task_sched_out(prev, next);
1275 }
1276
1277 extern void perf_event_mmap(struct vm_area_struct *vma);
1278 extern struct perf_guest_info_callbacks *perf_guest_cbs;
1279 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
1280 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
1281
1282 extern void perf_event_comm(struct task_struct *tsk);
1283 extern void perf_event_fork(struct task_struct *tsk);
1284
1285 /* Callchains */
1286 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
1287
1288 extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
1289 extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
1290
1291 static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
1292 {
1293 if (entry->nr < PERF_MAX_STACK_DEPTH)
1294 entry->ip[entry->nr++] = ip;
1295 }
1296
1297 extern int sysctl_perf_event_paranoid;
1298 extern int sysctl_perf_event_mlock;
1299 extern int sysctl_perf_event_sample_rate;
1300
1301 extern int perf_proc_update_handler(struct ctl_table *table, int write,
1302 void __user *buffer, size_t *lenp,
1303 loff_t *ppos);
1304
1305 static inline bool perf_paranoid_tracepoint_raw(void)
1306 {
1307 return sysctl_perf_event_paranoid > -1;
1308 }
1309
1310 static inline bool perf_paranoid_cpu(void)
1311 {
1312 return sysctl_perf_event_paranoid > 0;
1313 }
1314
1315 static inline bool perf_paranoid_kernel(void)
1316 {
1317 return sysctl_perf_event_paranoid > 1;
1318 }
1319
1320 extern void perf_event_init(void);
1321 extern void perf_tp_event(u64 addr, u64 count, void *record,
1322 int entry_size, struct pt_regs *regs,
1323 struct hlist_head *head, int rctx,
1324 struct task_struct *task);
1325 extern void perf_bp_event(struct perf_event *event, void *data);
1326
1327 #ifndef perf_misc_flags
1328 # define perf_misc_flags(regs) \
1329 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
1330 # define perf_instruction_pointer(regs) instruction_pointer(regs)
1331 #endif
1332
1333 static inline bool has_branch_stack(struct perf_event *event)
1334 {
1335 return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
1336 }
1337
1338 extern int perf_output_begin(struct perf_output_handle *handle,
1339 struct perf_event *event, unsigned int size);
1340 extern void perf_output_end(struct perf_output_handle *handle);
1341 extern unsigned int perf_output_copy(struct perf_output_handle *handle,
1342 const void *buf, unsigned int len);
1343 extern unsigned int perf_output_skip(struct perf_output_handle *handle,
1344 unsigned int len);
1345 extern int perf_swevent_get_recursion_context(void);
1346 extern void perf_swevent_put_recursion_context(int rctx);
1347 extern void perf_event_enable(struct perf_event *event);
1348 extern void perf_event_disable(struct perf_event *event);
1349 extern void perf_event_task_tick(void);
1350 #else
1351 static inline void
1352 perf_event_task_sched_in(struct task_struct *prev,
1353 struct task_struct *task) { }
1354 static inline void
1355 perf_event_task_sched_out(struct task_struct *prev,
1356 struct task_struct *next) { }
1357 static inline int perf_event_init_task(struct task_struct *child) { return 0; }
1358 static inline void perf_event_exit_task(struct task_struct *child) { }
1359 static inline void perf_event_free_task(struct task_struct *task) { }
1360 static inline void perf_event_delayed_put(struct task_struct *task) { }
1361 static inline void perf_event_print_debug(void) { }
1362 static inline int perf_event_task_disable(void) { return -EINVAL; }
1363 static inline int perf_event_task_enable(void) { return -EINVAL; }
1364 static inline int perf_event_refresh(struct perf_event *event, int refresh)
1365 {
1366 return -EINVAL;
1367 }
1368
1369 static inline void
1370 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { }
1371 static inline void
1372 perf_bp_event(struct perf_event *event, void *data) { }
1373
1374 static inline int perf_register_guest_info_callbacks
1375 (struct perf_guest_info_callbacks *callbacks) { return 0; }
1376 static inline int perf_unregister_guest_info_callbacks
1377 (struct perf_guest_info_callbacks *callbacks) { return 0; }
1378
1379 static inline void perf_event_mmap(struct vm_area_struct *vma) { }
1380 static inline void perf_event_comm(struct task_struct *tsk) { }
1381 static inline void perf_event_fork(struct task_struct *tsk) { }
1382 static inline void perf_event_init(void) { }
1383 static inline int perf_swevent_get_recursion_context(void) { return -1; }
1384 static inline void perf_swevent_put_recursion_context(int rctx) { }
1385 static inline void perf_event_enable(struct perf_event *event) { }
1386 static inline void perf_event_disable(struct perf_event *event) { }
1387 static inline void perf_event_task_tick(void) { }
1388 #endif
1389
1390 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
1391
1392 /*
1393 * This has to have a higher priority than migration_notifier in sched.c.
1394 */
1395 #define perf_cpu_notifier(fn) \
1396 do { \
1397 static struct notifier_block fn##_nb __cpuinitdata = \
1398 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
1399 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
1400 (void *)(unsigned long)smp_processor_id()); \
1401 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
1402 (void *)(unsigned long)smp_processor_id()); \
1403 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
1404 (void *)(unsigned long)smp_processor_id()); \
1405 register_cpu_notifier(&fn##_nb); \
1406 } while (0)
1407
1408
1409 #define PMU_FORMAT_ATTR(_name, _format) \
1410 static ssize_t \
1411 _name##_show(struct device *dev, \
1412 struct device_attribute *attr, \
1413 char *page) \
1414 { \
1415 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
1416 return sprintf(page, _format "\n"); \
1417 } \
1418 \
1419 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
1420
1421 #endif /* __KERNEL__ */
1422 #endif /* _LINUX_PERF_EVENT_H */
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