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![Hisao Tanabe](/assets/img/avatar_default.png)
If evsel is NULL, we should return NULL to avoid a NULL pointer
dereference a bit later in the code.
Signed-off-by: Hisao Tanabe <xtanabe@gmail.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Wang Nan <wangnan0@huawei.com>
Fixes: 03e0a7df3e
("perf tools: Introduce bpf-output event")
LPU-Reference: 20180824154556.23428-1-xtanabe@gmail.com
Link: https://lkml.kernel.org/n/tip-e5plzjhx6595a5yjaf22jss3@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2942 lines
72 KiB
C
2942 lines
72 KiB
C
/*
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* Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
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*
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* Parts came from builtin-{top,stat,record}.c, see those files for further
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* copyright notes.
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*
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* Released under the GPL v2. (and only v2, not any later version)
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*/
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#include <byteswap.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <linux/bitops.h>
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#include <api/fs/fs.h>
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#include <api/fs/tracing_path.h>
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#include <traceevent/event-parse.h>
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#include <linux/hw_breakpoint.h>
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#include <linux/perf_event.h>
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#include <linux/compiler.h>
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#include <linux/err.h>
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#include <sys/ioctl.h>
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#include <sys/resource.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include "asm/bug.h"
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#include "callchain.h"
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#include "cgroup.h"
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#include "event.h"
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#include "evsel.h"
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#include "evlist.h"
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#include "util.h"
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#include "cpumap.h"
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#include "thread_map.h"
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#include "target.h"
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#include "perf_regs.h"
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#include "debug.h"
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#include "trace-event.h"
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#include "stat.h"
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#include "memswap.h"
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#include "util/parse-branch-options.h"
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#include "sane_ctype.h"
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struct perf_missing_features perf_missing_features;
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static clockid_t clockid;
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static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
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{
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return 0;
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}
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void __weak test_attr__ready(void) { }
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static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
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{
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}
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static struct {
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size_t size;
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int (*init)(struct perf_evsel *evsel);
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void (*fini)(struct perf_evsel *evsel);
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} perf_evsel__object = {
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.size = sizeof(struct perf_evsel),
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.init = perf_evsel__no_extra_init,
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.fini = perf_evsel__no_extra_fini,
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};
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int perf_evsel__object_config(size_t object_size,
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int (*init)(struct perf_evsel *evsel),
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void (*fini)(struct perf_evsel *evsel))
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{
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if (object_size == 0)
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goto set_methods;
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if (perf_evsel__object.size > object_size)
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return -EINVAL;
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perf_evsel__object.size = object_size;
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set_methods:
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if (init != NULL)
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perf_evsel__object.init = init;
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if (fini != NULL)
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perf_evsel__object.fini = fini;
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return 0;
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}
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#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
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int __perf_evsel__sample_size(u64 sample_type)
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{
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u64 mask = sample_type & PERF_SAMPLE_MASK;
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int size = 0;
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int i;
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for (i = 0; i < 64; i++) {
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if (mask & (1ULL << i))
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size++;
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}
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size *= sizeof(u64);
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return size;
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}
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/**
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* __perf_evsel__calc_id_pos - calculate id_pos.
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* @sample_type: sample type
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*
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* This function returns the position of the event id (PERF_SAMPLE_ID or
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* PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
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* sample_event.
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*/
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static int __perf_evsel__calc_id_pos(u64 sample_type)
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{
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int idx = 0;
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if (sample_type & PERF_SAMPLE_IDENTIFIER)
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return 0;
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if (!(sample_type & PERF_SAMPLE_ID))
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return -1;
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if (sample_type & PERF_SAMPLE_IP)
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idx += 1;
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if (sample_type & PERF_SAMPLE_TID)
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idx += 1;
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if (sample_type & PERF_SAMPLE_TIME)
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idx += 1;
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if (sample_type & PERF_SAMPLE_ADDR)
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idx += 1;
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return idx;
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}
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/**
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* __perf_evsel__calc_is_pos - calculate is_pos.
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* @sample_type: sample type
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*
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* This function returns the position (counting backwards) of the event id
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* (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
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* sample_id_all is used there is an id sample appended to non-sample events.
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*/
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static int __perf_evsel__calc_is_pos(u64 sample_type)
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{
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int idx = 1;
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if (sample_type & PERF_SAMPLE_IDENTIFIER)
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return 1;
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if (!(sample_type & PERF_SAMPLE_ID))
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return -1;
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if (sample_type & PERF_SAMPLE_CPU)
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idx += 1;
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if (sample_type & PERF_SAMPLE_STREAM_ID)
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idx += 1;
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return idx;
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}
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void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
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{
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evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
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evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
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}
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void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
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enum perf_event_sample_format bit)
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{
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if (!(evsel->attr.sample_type & bit)) {
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evsel->attr.sample_type |= bit;
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evsel->sample_size += sizeof(u64);
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perf_evsel__calc_id_pos(evsel);
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}
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}
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void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
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enum perf_event_sample_format bit)
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{
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if (evsel->attr.sample_type & bit) {
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evsel->attr.sample_type &= ~bit;
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evsel->sample_size -= sizeof(u64);
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perf_evsel__calc_id_pos(evsel);
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}
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}
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void perf_evsel__set_sample_id(struct perf_evsel *evsel,
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bool can_sample_identifier)
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{
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if (can_sample_identifier) {
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perf_evsel__reset_sample_bit(evsel, ID);
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perf_evsel__set_sample_bit(evsel, IDENTIFIER);
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} else {
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perf_evsel__set_sample_bit(evsel, ID);
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}
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evsel->attr.read_format |= PERF_FORMAT_ID;
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}
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/**
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* perf_evsel__is_function_event - Return whether given evsel is a function
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* trace event
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*
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* @evsel - evsel selector to be tested
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*
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* Return %true if event is function trace event
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*/
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bool perf_evsel__is_function_event(struct perf_evsel *evsel)
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{
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#define FUNCTION_EVENT "ftrace:function"
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return evsel->name &&
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!strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
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#undef FUNCTION_EVENT
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}
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void perf_evsel__init(struct perf_evsel *evsel,
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struct perf_event_attr *attr, int idx)
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{
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evsel->idx = idx;
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evsel->tracking = !idx;
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evsel->attr = *attr;
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evsel->leader = evsel;
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evsel->unit = "";
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evsel->scale = 1.0;
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evsel->evlist = NULL;
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evsel->bpf_fd = -1;
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INIT_LIST_HEAD(&evsel->node);
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INIT_LIST_HEAD(&evsel->config_terms);
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perf_evsel__object.init(evsel);
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evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
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perf_evsel__calc_id_pos(evsel);
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evsel->cmdline_group_boundary = false;
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evsel->metric_expr = NULL;
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evsel->metric_name = NULL;
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evsel->metric_events = NULL;
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evsel->collect_stat = false;
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evsel->pmu_name = NULL;
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}
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struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
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{
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struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
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if (!evsel)
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return NULL;
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perf_evsel__init(evsel, attr, idx);
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if (perf_evsel__is_bpf_output(evsel)) {
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evsel->attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
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PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
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evsel->attr.sample_period = 1;
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}
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if (perf_evsel__is_clock(evsel)) {
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/*
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* The evsel->unit points to static alias->unit
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* so it's ok to use static string in here.
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*/
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static const char *unit = "msec";
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evsel->unit = unit;
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evsel->scale = 1e-6;
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}
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return evsel;
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}
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static bool perf_event_can_profile_kernel(void)
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{
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return geteuid() == 0 || perf_event_paranoid() == -1;
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}
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struct perf_evsel *perf_evsel__new_cycles(bool precise)
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{
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struct perf_event_attr attr = {
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.type = PERF_TYPE_HARDWARE,
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.config = PERF_COUNT_HW_CPU_CYCLES,
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.exclude_kernel = !perf_event_can_profile_kernel(),
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};
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struct perf_evsel *evsel;
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event_attr_init(&attr);
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if (!precise)
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goto new_event;
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/*
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* Unnamed union member, not supported as struct member named
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* initializer in older compilers such as gcc 4.4.7
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*
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* Just for probing the precise_ip:
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*/
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attr.sample_period = 1;
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perf_event_attr__set_max_precise_ip(&attr);
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/*
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* Now let the usual logic to set up the perf_event_attr defaults
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* to kick in when we return and before perf_evsel__open() is called.
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*/
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attr.sample_period = 0;
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new_event:
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evsel = perf_evsel__new(&attr);
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if (evsel == NULL)
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goto out;
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/* use asprintf() because free(evsel) assumes name is allocated */
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if (asprintf(&evsel->name, "cycles%s%s%.*s",
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(attr.precise_ip || attr.exclude_kernel) ? ":" : "",
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attr.exclude_kernel ? "u" : "",
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attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
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goto error_free;
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out:
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return evsel;
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error_free:
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perf_evsel__delete(evsel);
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evsel = NULL;
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goto out;
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}
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/*
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* Returns pointer with encoded error via <linux/err.h> interface.
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*/
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struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
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{
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struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
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int err = -ENOMEM;
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if (evsel == NULL) {
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goto out_err;
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} else {
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struct perf_event_attr attr = {
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.type = PERF_TYPE_TRACEPOINT,
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.sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
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PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
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};
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if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
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goto out_free;
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evsel->tp_format = trace_event__tp_format(sys, name);
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if (IS_ERR(evsel->tp_format)) {
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err = PTR_ERR(evsel->tp_format);
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goto out_free;
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}
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event_attr_init(&attr);
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attr.config = evsel->tp_format->id;
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attr.sample_period = 1;
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perf_evsel__init(evsel, &attr, idx);
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}
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return evsel;
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out_free:
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zfree(&evsel->name);
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free(evsel);
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out_err:
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return ERR_PTR(err);
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}
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const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
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"cycles",
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"instructions",
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"cache-references",
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"cache-misses",
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"branches",
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"branch-misses",
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"bus-cycles",
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"stalled-cycles-frontend",
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"stalled-cycles-backend",
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"ref-cycles",
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};
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static const char *__perf_evsel__hw_name(u64 config)
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{
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if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
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return perf_evsel__hw_names[config];
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return "unknown-hardware";
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}
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static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
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{
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int colon = 0, r = 0;
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struct perf_event_attr *attr = &evsel->attr;
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bool exclude_guest_default = false;
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#define MOD_PRINT(context, mod) do { \
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if (!attr->exclude_##context) { \
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if (!colon) colon = ++r; \
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r += scnprintf(bf + r, size - r, "%c", mod); \
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} } while(0)
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if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
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MOD_PRINT(kernel, 'k');
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MOD_PRINT(user, 'u');
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MOD_PRINT(hv, 'h');
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exclude_guest_default = true;
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}
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if (attr->precise_ip) {
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if (!colon)
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colon = ++r;
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r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
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exclude_guest_default = true;
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}
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if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
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MOD_PRINT(host, 'H');
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MOD_PRINT(guest, 'G');
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}
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#undef MOD_PRINT
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if (colon)
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bf[colon - 1] = ':';
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return r;
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}
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static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
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{
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int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
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return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
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}
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const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
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"cpu-clock",
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"task-clock",
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"page-faults",
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"context-switches",
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"cpu-migrations",
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"minor-faults",
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"major-faults",
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"alignment-faults",
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"emulation-faults",
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"dummy",
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};
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|
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static const char *__perf_evsel__sw_name(u64 config)
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{
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if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
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return perf_evsel__sw_names[config];
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return "unknown-software";
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}
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|
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static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
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{
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int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
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return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
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}
|
|
|
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static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
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{
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int r;
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r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
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|
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if (type & HW_BREAKPOINT_R)
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r += scnprintf(bf + r, size - r, "r");
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|
|
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if (type & HW_BREAKPOINT_W)
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r += scnprintf(bf + r, size - r, "w");
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|
|
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if (type & HW_BREAKPOINT_X)
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r += scnprintf(bf + r, size - r, "x");
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return r;
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|
}
|
|
|
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static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
|
|
{
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struct perf_event_attr *attr = &evsel->attr;
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|
int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
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return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
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}
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|
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const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
|
|
[PERF_EVSEL__MAX_ALIASES] = {
|
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{ "L1-dcache", "l1-d", "l1d", "L1-data", },
|
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{ "L1-icache", "l1-i", "l1i", "L1-instruction", },
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{ "LLC", "L2", },
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{ "dTLB", "d-tlb", "Data-TLB", },
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{ "iTLB", "i-tlb", "Instruction-TLB", },
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{ "branch", "branches", "bpu", "btb", "bpc", },
|
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{ "node", },
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};
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|
|
const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
|
|
[PERF_EVSEL__MAX_ALIASES] = {
|
|
{ "load", "loads", "read", },
|
|
{ "store", "stores", "write", },
|
|
{ "prefetch", "prefetches", "speculative-read", "speculative-load", },
|
|
};
|
|
|
|
const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
|
|
[PERF_EVSEL__MAX_ALIASES] = {
|
|
{ "refs", "Reference", "ops", "access", },
|
|
{ "misses", "miss", },
|
|
};
|
|
|
|
#define C(x) PERF_COUNT_HW_CACHE_##x
|
|
#define CACHE_READ (1 << C(OP_READ))
|
|
#define CACHE_WRITE (1 << C(OP_WRITE))
|
|
#define CACHE_PREFETCH (1 << C(OP_PREFETCH))
|
|
#define COP(x) (1 << x)
|
|
|
|
/*
|
|
* cache operartion stat
|
|
* L1I : Read and prefetch only
|
|
* ITLB and BPU : Read-only
|
|
*/
|
|
static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
|
|
[C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
|
|
[C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
|
|
[C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
|
|
[C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
|
|
[C(ITLB)] = (CACHE_READ),
|
|
[C(BPU)] = (CACHE_READ),
|
|
[C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
|
|
};
|
|
|
|
bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
|
|
{
|
|
if (perf_evsel__hw_cache_stat[type] & COP(op))
|
|
return true; /* valid */
|
|
else
|
|
return false; /* invalid */
|
|
}
|
|
|
|
int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
|
|
char *bf, size_t size)
|
|
{
|
|
if (result) {
|
|
return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
|
|
perf_evsel__hw_cache_op[op][0],
|
|
perf_evsel__hw_cache_result[result][0]);
|
|
}
|
|
|
|
return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
|
|
perf_evsel__hw_cache_op[op][1]);
|
|
}
|
|
|
|
static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
|
|
{
|
|
u8 op, result, type = (config >> 0) & 0xff;
|
|
const char *err = "unknown-ext-hardware-cache-type";
|
|
|
|
if (type >= PERF_COUNT_HW_CACHE_MAX)
|
|
goto out_err;
|
|
|
|
op = (config >> 8) & 0xff;
|
|
err = "unknown-ext-hardware-cache-op";
|
|
if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
|
|
goto out_err;
|
|
|
|
result = (config >> 16) & 0xff;
|
|
err = "unknown-ext-hardware-cache-result";
|
|
if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
|
|
goto out_err;
|
|
|
|
err = "invalid-cache";
|
|
if (!perf_evsel__is_cache_op_valid(type, op))
|
|
goto out_err;
|
|
|
|
return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
|
|
out_err:
|
|
return scnprintf(bf, size, "%s", err);
|
|
}
|
|
|
|
static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
|
|
{
|
|
int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
|
|
return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
|
|
}
|
|
|
|
static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
|
|
{
|
|
int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
|
|
return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
|
|
}
|
|
|
|
const char *perf_evsel__name(struct perf_evsel *evsel)
|
|
{
|
|
char bf[128];
|
|
|
|
if (evsel->name)
|
|
return evsel->name;
|
|
|
|
switch (evsel->attr.type) {
|
|
case PERF_TYPE_RAW:
|
|
perf_evsel__raw_name(evsel, bf, sizeof(bf));
|
|
break;
|
|
|
|
case PERF_TYPE_HARDWARE:
|
|
perf_evsel__hw_name(evsel, bf, sizeof(bf));
|
|
break;
|
|
|
|
case PERF_TYPE_HW_CACHE:
|
|
perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
|
|
break;
|
|
|
|
case PERF_TYPE_SOFTWARE:
|
|
perf_evsel__sw_name(evsel, bf, sizeof(bf));
|
|
break;
|
|
|
|
case PERF_TYPE_TRACEPOINT:
|
|
scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
|
|
break;
|
|
|
|
case PERF_TYPE_BREAKPOINT:
|
|
perf_evsel__bp_name(evsel, bf, sizeof(bf));
|
|
break;
|
|
|
|
default:
|
|
scnprintf(bf, sizeof(bf), "unknown attr type: %d",
|
|
evsel->attr.type);
|
|
break;
|
|
}
|
|
|
|
evsel->name = strdup(bf);
|
|
|
|
return evsel->name ?: "unknown";
|
|
}
|
|
|
|
const char *perf_evsel__group_name(struct perf_evsel *evsel)
|
|
{
|
|
return evsel->group_name ?: "anon group";
|
|
}
|
|
|
|
/*
|
|
* Returns the group details for the specified leader,
|
|
* with following rules.
|
|
*
|
|
* For record -e '{cycles,instructions}'
|
|
* 'anon group { cycles:u, instructions:u }'
|
|
*
|
|
* For record -e 'cycles,instructions' and report --group
|
|
* 'cycles:u, instructions:u'
|
|
*/
|
|
int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
|
|
{
|
|
int ret = 0;
|
|
struct perf_evsel *pos;
|
|
const char *group_name = perf_evsel__group_name(evsel);
|
|
|
|
if (!evsel->forced_leader)
|
|
ret = scnprintf(buf, size, "%s { ", group_name);
|
|
|
|
ret += scnprintf(buf + ret, size - ret, "%s",
|
|
perf_evsel__name(evsel));
|
|
|
|
for_each_group_member(pos, evsel)
|
|
ret += scnprintf(buf + ret, size - ret, ", %s",
|
|
perf_evsel__name(pos));
|
|
|
|
if (!evsel->forced_leader)
|
|
ret += scnprintf(buf + ret, size - ret, " }");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __perf_evsel__config_callchain(struct perf_evsel *evsel,
|
|
struct record_opts *opts,
|
|
struct callchain_param *param)
|
|
{
|
|
bool function = perf_evsel__is_function_event(evsel);
|
|
struct perf_event_attr *attr = &evsel->attr;
|
|
|
|
perf_evsel__set_sample_bit(evsel, CALLCHAIN);
|
|
|
|
attr->sample_max_stack = param->max_stack;
|
|
|
|
if (param->record_mode == CALLCHAIN_LBR) {
|
|
if (!opts->branch_stack) {
|
|
if (attr->exclude_user) {
|
|
pr_warning("LBR callstack option is only available "
|
|
"to get user callchain information. "
|
|
"Falling back to framepointers.\n");
|
|
} else {
|
|
perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
|
|
attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
|
|
PERF_SAMPLE_BRANCH_CALL_STACK |
|
|
PERF_SAMPLE_BRANCH_NO_CYCLES |
|
|
PERF_SAMPLE_BRANCH_NO_FLAGS;
|
|
}
|
|
} else
|
|
pr_warning("Cannot use LBR callstack with branch stack. "
|
|
"Falling back to framepointers.\n");
|
|
}
|
|
|
|
if (param->record_mode == CALLCHAIN_DWARF) {
|
|
if (!function) {
|
|
perf_evsel__set_sample_bit(evsel, REGS_USER);
|
|
perf_evsel__set_sample_bit(evsel, STACK_USER);
|
|
attr->sample_regs_user |= PERF_REGS_MASK;
|
|
attr->sample_stack_user = param->dump_size;
|
|
attr->exclude_callchain_user = 1;
|
|
} else {
|
|
pr_info("Cannot use DWARF unwind for function trace event,"
|
|
" falling back to framepointers.\n");
|
|
}
|
|
}
|
|
|
|
if (function) {
|
|
pr_info("Disabling user space callchains for function trace event.\n");
|
|
attr->exclude_callchain_user = 1;
|
|
}
|
|
}
|
|
|
|
void perf_evsel__config_callchain(struct perf_evsel *evsel,
|
|
struct record_opts *opts,
|
|
struct callchain_param *param)
|
|
{
|
|
if (param->enabled)
|
|
return __perf_evsel__config_callchain(evsel, opts, param);
|
|
}
|
|
|
|
static void
|
|
perf_evsel__reset_callgraph(struct perf_evsel *evsel,
|
|
struct callchain_param *param)
|
|
{
|
|
struct perf_event_attr *attr = &evsel->attr;
|
|
|
|
perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
|
|
if (param->record_mode == CALLCHAIN_LBR) {
|
|
perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
|
|
attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
|
|
PERF_SAMPLE_BRANCH_CALL_STACK);
|
|
}
|
|
if (param->record_mode == CALLCHAIN_DWARF) {
|
|
perf_evsel__reset_sample_bit(evsel, REGS_USER);
|
|
perf_evsel__reset_sample_bit(evsel, STACK_USER);
|
|
}
|
|
}
|
|
|
|
static void apply_config_terms(struct perf_evsel *evsel,
|
|
struct record_opts *opts, bool track)
|
|
{
|
|
struct perf_evsel_config_term *term;
|
|
struct list_head *config_terms = &evsel->config_terms;
|
|
struct perf_event_attr *attr = &evsel->attr;
|
|
/* callgraph default */
|
|
struct callchain_param param = {
|
|
.record_mode = callchain_param.record_mode,
|
|
};
|
|
u32 dump_size = 0;
|
|
int max_stack = 0;
|
|
const char *callgraph_buf = NULL;
|
|
|
|
list_for_each_entry(term, config_terms, list) {
|
|
switch (term->type) {
|
|
case PERF_EVSEL__CONFIG_TERM_PERIOD:
|
|
if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
|
|
attr->sample_period = term->val.period;
|
|
attr->freq = 0;
|
|
perf_evsel__reset_sample_bit(evsel, PERIOD);
|
|
}
|
|
break;
|
|
case PERF_EVSEL__CONFIG_TERM_FREQ:
|
|
if (!(term->weak && opts->user_freq != UINT_MAX)) {
|
|
attr->sample_freq = term->val.freq;
|
|
attr->freq = 1;
|
|
perf_evsel__set_sample_bit(evsel, PERIOD);
|
|
}
|
|
break;
|
|
case PERF_EVSEL__CONFIG_TERM_TIME:
|
|
if (term->val.time)
|
|
perf_evsel__set_sample_bit(evsel, TIME);
|
|
else
|
|
perf_evsel__reset_sample_bit(evsel, TIME);
|
|
break;
|
|
case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
|
|
callgraph_buf = term->val.callgraph;
|
|
break;
|
|
case PERF_EVSEL__CONFIG_TERM_BRANCH:
|
|
if (term->val.branch && strcmp(term->val.branch, "no")) {
|
|
perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
|
|
parse_branch_str(term->val.branch,
|
|
&attr->branch_sample_type);
|
|
} else
|
|
perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
|
|
break;
|
|
case PERF_EVSEL__CONFIG_TERM_STACK_USER:
|
|
dump_size = term->val.stack_user;
|
|
break;
|
|
case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
|
|
max_stack = term->val.max_stack;
|
|
break;
|
|
case PERF_EVSEL__CONFIG_TERM_INHERIT:
|
|
/*
|
|
* attr->inherit should has already been set by
|
|
* perf_evsel__config. If user explicitly set
|
|
* inherit using config terms, override global
|
|
* opt->no_inherit setting.
|
|
*/
|
|
attr->inherit = term->val.inherit ? 1 : 0;
|
|
break;
|
|
case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
|
|
attr->write_backward = term->val.overwrite ? 1 : 0;
|
|
break;
|
|
case PERF_EVSEL__CONFIG_TERM_DRV_CFG:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* User explicitly set per-event callgraph, clear the old setting and reset. */
|
|
if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
|
|
bool sample_address = false;
|
|
|
|
if (max_stack) {
|
|
param.max_stack = max_stack;
|
|
if (callgraph_buf == NULL)
|
|
callgraph_buf = "fp";
|
|
}
|
|
|
|
/* parse callgraph parameters */
|
|
if (callgraph_buf != NULL) {
|
|
if (!strcmp(callgraph_buf, "no")) {
|
|
param.enabled = false;
|
|
param.record_mode = CALLCHAIN_NONE;
|
|
} else {
|
|
param.enabled = true;
|
|
if (parse_callchain_record(callgraph_buf, ¶m)) {
|
|
pr_err("per-event callgraph setting for %s failed. "
|
|
"Apply callgraph global setting for it\n",
|
|
evsel->name);
|
|
return;
|
|
}
|
|
if (param.record_mode == CALLCHAIN_DWARF)
|
|
sample_address = true;
|
|
}
|
|
}
|
|
if (dump_size > 0) {
|
|
dump_size = round_up(dump_size, sizeof(u64));
|
|
param.dump_size = dump_size;
|
|
}
|
|
|
|
/* If global callgraph set, clear it */
|
|
if (callchain_param.enabled)
|
|
perf_evsel__reset_callgraph(evsel, &callchain_param);
|
|
|
|
/* set perf-event callgraph */
|
|
if (param.enabled) {
|
|
if (sample_address) {
|
|
perf_evsel__set_sample_bit(evsel, ADDR);
|
|
perf_evsel__set_sample_bit(evsel, DATA_SRC);
|
|
evsel->attr.mmap_data = track;
|
|
}
|
|
perf_evsel__config_callchain(evsel, opts, ¶m);
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool is_dummy_event(struct perf_evsel *evsel)
|
|
{
|
|
return (evsel->attr.type == PERF_TYPE_SOFTWARE) &&
|
|
(evsel->attr.config == PERF_COUNT_SW_DUMMY);
|
|
}
|
|
|
|
/*
|
|
* The enable_on_exec/disabled value strategy:
|
|
*
|
|
* 1) For any type of traced program:
|
|
* - all independent events and group leaders are disabled
|
|
* - all group members are enabled
|
|
*
|
|
* Group members are ruled by group leaders. They need to
|
|
* be enabled, because the group scheduling relies on that.
|
|
*
|
|
* 2) For traced programs executed by perf:
|
|
* - all independent events and group leaders have
|
|
* enable_on_exec set
|
|
* - we don't specifically enable or disable any event during
|
|
* the record command
|
|
*
|
|
* Independent events and group leaders are initially disabled
|
|
* and get enabled by exec. Group members are ruled by group
|
|
* leaders as stated in 1).
|
|
*
|
|
* 3) For traced programs attached by perf (pid/tid):
|
|
* - we specifically enable or disable all events during
|
|
* the record command
|
|
*
|
|
* When attaching events to already running traced we
|
|
* enable/disable events specifically, as there's no
|
|
* initial traced exec call.
|
|
*/
|
|
void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
|
|
struct callchain_param *callchain)
|
|
{
|
|
struct perf_evsel *leader = evsel->leader;
|
|
struct perf_event_attr *attr = &evsel->attr;
|
|
int track = evsel->tracking;
|
|
bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
|
|
|
|
attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
|
|
attr->inherit = !opts->no_inherit;
|
|
attr->write_backward = opts->overwrite ? 1 : 0;
|
|
|
|
perf_evsel__set_sample_bit(evsel, IP);
|
|
perf_evsel__set_sample_bit(evsel, TID);
|
|
|
|
if (evsel->sample_read) {
|
|
perf_evsel__set_sample_bit(evsel, READ);
|
|
|
|
/*
|
|
* We need ID even in case of single event, because
|
|
* PERF_SAMPLE_READ process ID specific data.
|
|
*/
|
|
perf_evsel__set_sample_id(evsel, false);
|
|
|
|
/*
|
|
* Apply group format only if we belong to group
|
|
* with more than one members.
|
|
*/
|
|
if (leader->nr_members > 1) {
|
|
attr->read_format |= PERF_FORMAT_GROUP;
|
|
attr->inherit = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We default some events to have a default interval. But keep
|
|
* it a weak assumption overridable by the user.
|
|
*/
|
|
if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
|
|
opts->user_interval != ULLONG_MAX)) {
|
|
if (opts->freq) {
|
|
perf_evsel__set_sample_bit(evsel, PERIOD);
|
|
attr->freq = 1;
|
|
attr->sample_freq = opts->freq;
|
|
} else {
|
|
attr->sample_period = opts->default_interval;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Disable sampling for all group members other
|
|
* than leader in case leader 'leads' the sampling.
|
|
*/
|
|
if ((leader != evsel) && leader->sample_read) {
|
|
attr->freq = 0;
|
|
attr->sample_freq = 0;
|
|
attr->sample_period = 0;
|
|
attr->write_backward = 0;
|
|
attr->sample_id_all = 0;
|
|
}
|
|
|
|
if (opts->no_samples)
|
|
attr->sample_freq = 0;
|
|
|
|
if (opts->inherit_stat) {
|
|
evsel->attr.read_format |=
|
|
PERF_FORMAT_TOTAL_TIME_ENABLED |
|
|
PERF_FORMAT_TOTAL_TIME_RUNNING |
|
|
PERF_FORMAT_ID;
|
|
attr->inherit_stat = 1;
|
|
}
|
|
|
|
if (opts->sample_address) {
|
|
perf_evsel__set_sample_bit(evsel, ADDR);
|
|
attr->mmap_data = track;
|
|
}
|
|
|
|
/*
|
|
* We don't allow user space callchains for function trace
|
|
* event, due to issues with page faults while tracing page
|
|
* fault handler and its overall trickiness nature.
|
|
*/
|
|
if (perf_evsel__is_function_event(evsel))
|
|
evsel->attr.exclude_callchain_user = 1;
|
|
|
|
if (callchain && callchain->enabled && !evsel->no_aux_samples)
|
|
perf_evsel__config_callchain(evsel, opts, callchain);
|
|
|
|
if (opts->sample_intr_regs) {
|
|
attr->sample_regs_intr = opts->sample_intr_regs;
|
|
perf_evsel__set_sample_bit(evsel, REGS_INTR);
|
|
}
|
|
|
|
if (opts->sample_user_regs) {
|
|
attr->sample_regs_user |= opts->sample_user_regs;
|
|
perf_evsel__set_sample_bit(evsel, REGS_USER);
|
|
}
|
|
|
|
if (target__has_cpu(&opts->target) || opts->sample_cpu)
|
|
perf_evsel__set_sample_bit(evsel, CPU);
|
|
|
|
/*
|
|
* When the user explicitly disabled time don't force it here.
|
|
*/
|
|
if (opts->sample_time &&
|
|
(!perf_missing_features.sample_id_all &&
|
|
(!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
|
|
opts->sample_time_set)))
|
|
perf_evsel__set_sample_bit(evsel, TIME);
|
|
|
|
if (opts->raw_samples && !evsel->no_aux_samples) {
|
|
perf_evsel__set_sample_bit(evsel, TIME);
|
|
perf_evsel__set_sample_bit(evsel, RAW);
|
|
perf_evsel__set_sample_bit(evsel, CPU);
|
|
}
|
|
|
|
if (opts->sample_address)
|
|
perf_evsel__set_sample_bit(evsel, DATA_SRC);
|
|
|
|
if (opts->sample_phys_addr)
|
|
perf_evsel__set_sample_bit(evsel, PHYS_ADDR);
|
|
|
|
if (opts->no_buffering) {
|
|
attr->watermark = 0;
|
|
attr->wakeup_events = 1;
|
|
}
|
|
if (opts->branch_stack && !evsel->no_aux_samples) {
|
|
perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
|
|
attr->branch_sample_type = opts->branch_stack;
|
|
}
|
|
|
|
if (opts->sample_weight)
|
|
perf_evsel__set_sample_bit(evsel, WEIGHT);
|
|
|
|
attr->task = track;
|
|
attr->mmap = track;
|
|
attr->mmap2 = track && !perf_missing_features.mmap2;
|
|
attr->comm = track;
|
|
|
|
if (opts->record_namespaces)
|
|
attr->namespaces = track;
|
|
|
|
if (opts->record_switch_events)
|
|
attr->context_switch = track;
|
|
|
|
if (opts->sample_transaction)
|
|
perf_evsel__set_sample_bit(evsel, TRANSACTION);
|
|
|
|
if (opts->running_time) {
|
|
evsel->attr.read_format |=
|
|
PERF_FORMAT_TOTAL_TIME_ENABLED |
|
|
PERF_FORMAT_TOTAL_TIME_RUNNING;
|
|
}
|
|
|
|
/*
|
|
* XXX see the function comment above
|
|
*
|
|
* Disabling only independent events or group leaders,
|
|
* keeping group members enabled.
|
|
*/
|
|
if (perf_evsel__is_group_leader(evsel))
|
|
attr->disabled = 1;
|
|
|
|
/*
|
|
* Setting enable_on_exec for independent events and
|
|
* group leaders for traced executed by perf.
|
|
*/
|
|
if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
|
|
!opts->initial_delay)
|
|
attr->enable_on_exec = 1;
|
|
|
|
if (evsel->immediate) {
|
|
attr->disabled = 0;
|
|
attr->enable_on_exec = 0;
|
|
}
|
|
|
|
clockid = opts->clockid;
|
|
if (opts->use_clockid) {
|
|
attr->use_clockid = 1;
|
|
attr->clockid = opts->clockid;
|
|
}
|
|
|
|
if (evsel->precise_max)
|
|
perf_event_attr__set_max_precise_ip(attr);
|
|
|
|
if (opts->all_user) {
|
|
attr->exclude_kernel = 1;
|
|
attr->exclude_user = 0;
|
|
}
|
|
|
|
if (opts->all_kernel) {
|
|
attr->exclude_kernel = 0;
|
|
attr->exclude_user = 1;
|
|
}
|
|
|
|
/*
|
|
* Apply event specific term settings,
|
|
* it overloads any global configuration.
|
|
*/
|
|
apply_config_terms(evsel, opts, track);
|
|
|
|
evsel->ignore_missing_thread = opts->ignore_missing_thread;
|
|
|
|
/* The --period option takes the precedence. */
|
|
if (opts->period_set) {
|
|
if (opts->period)
|
|
perf_evsel__set_sample_bit(evsel, PERIOD);
|
|
else
|
|
perf_evsel__reset_sample_bit(evsel, PERIOD);
|
|
}
|
|
|
|
/*
|
|
* For initial_delay, a dummy event is added implicitly.
|
|
* The software event will trigger -EOPNOTSUPP error out,
|
|
* if BRANCH_STACK bit is set.
|
|
*/
|
|
if (opts->initial_delay && is_dummy_event(evsel))
|
|
perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
|
|
}
|
|
|
|
static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
|
|
{
|
|
if (evsel->system_wide)
|
|
nthreads = 1;
|
|
|
|
evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
|
|
|
|
if (evsel->fd) {
|
|
int cpu, thread;
|
|
for (cpu = 0; cpu < ncpus; cpu++) {
|
|
for (thread = 0; thread < nthreads; thread++) {
|
|
FD(evsel, cpu, thread) = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return evsel->fd != NULL ? 0 : -ENOMEM;
|
|
}
|
|
|
|
static int perf_evsel__run_ioctl(struct perf_evsel *evsel,
|
|
int ioc, void *arg)
|
|
{
|
|
int cpu, thread;
|
|
|
|
for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
|
|
for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
|
|
int fd = FD(evsel, cpu, thread),
|
|
err = ioctl(fd, ioc, arg);
|
|
|
|
if (err)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter)
|
|
{
|
|
return perf_evsel__run_ioctl(evsel,
|
|
PERF_EVENT_IOC_SET_FILTER,
|
|
(void *)filter);
|
|
}
|
|
|
|
int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
|
|
{
|
|
char *new_filter = strdup(filter);
|
|
|
|
if (new_filter != NULL) {
|
|
free(evsel->filter);
|
|
evsel->filter = new_filter;
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int perf_evsel__append_filter(struct perf_evsel *evsel,
|
|
const char *fmt, const char *filter)
|
|
{
|
|
char *new_filter;
|
|
|
|
if (evsel->filter == NULL)
|
|
return perf_evsel__set_filter(evsel, filter);
|
|
|
|
if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
|
|
free(evsel->filter);
|
|
evsel->filter = new_filter;
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
int perf_evsel__append_tp_filter(struct perf_evsel *evsel, const char *filter)
|
|
{
|
|
return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter);
|
|
}
|
|
|
|
int perf_evsel__append_addr_filter(struct perf_evsel *evsel, const char *filter)
|
|
{
|
|
return perf_evsel__append_filter(evsel, "%s,%s", filter);
|
|
}
|
|
|
|
int perf_evsel__enable(struct perf_evsel *evsel)
|
|
{
|
|
return perf_evsel__run_ioctl(evsel,
|
|
PERF_EVENT_IOC_ENABLE,
|
|
0);
|
|
}
|
|
|
|
int perf_evsel__disable(struct perf_evsel *evsel)
|
|
{
|
|
return perf_evsel__run_ioctl(evsel,
|
|
PERF_EVENT_IOC_DISABLE,
|
|
0);
|
|
}
|
|
|
|
int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
|
|
{
|
|
if (ncpus == 0 || nthreads == 0)
|
|
return 0;
|
|
|
|
if (evsel->system_wide)
|
|
nthreads = 1;
|
|
|
|
evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
|
|
if (evsel->sample_id == NULL)
|
|
return -ENOMEM;
|
|
|
|
evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
|
|
if (evsel->id == NULL) {
|
|
xyarray__delete(evsel->sample_id);
|
|
evsel->sample_id = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void perf_evsel__free_fd(struct perf_evsel *evsel)
|
|
{
|
|
xyarray__delete(evsel->fd);
|
|
evsel->fd = NULL;
|
|
}
|
|
|
|
static void perf_evsel__free_id(struct perf_evsel *evsel)
|
|
{
|
|
xyarray__delete(evsel->sample_id);
|
|
evsel->sample_id = NULL;
|
|
zfree(&evsel->id);
|
|
}
|
|
|
|
static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
|
|
{
|
|
struct perf_evsel_config_term *term, *h;
|
|
|
|
list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
|
|
list_del(&term->list);
|
|
free(term);
|
|
}
|
|
}
|
|
|
|
void perf_evsel__close_fd(struct perf_evsel *evsel)
|
|
{
|
|
int cpu, thread;
|
|
|
|
for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++)
|
|
for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
|
|
close(FD(evsel, cpu, thread));
|
|
FD(evsel, cpu, thread) = -1;
|
|
}
|
|
}
|
|
|
|
void perf_evsel__exit(struct perf_evsel *evsel)
|
|
{
|
|
assert(list_empty(&evsel->node));
|
|
assert(evsel->evlist == NULL);
|
|
perf_evsel__free_fd(evsel);
|
|
perf_evsel__free_id(evsel);
|
|
perf_evsel__free_config_terms(evsel);
|
|
cgroup__put(evsel->cgrp);
|
|
cpu_map__put(evsel->cpus);
|
|
cpu_map__put(evsel->own_cpus);
|
|
thread_map__put(evsel->threads);
|
|
zfree(&evsel->group_name);
|
|
zfree(&evsel->name);
|
|
perf_evsel__object.fini(evsel);
|
|
}
|
|
|
|
void perf_evsel__delete(struct perf_evsel *evsel)
|
|
{
|
|
perf_evsel__exit(evsel);
|
|
free(evsel);
|
|
}
|
|
|
|
void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
|
|
struct perf_counts_values *count)
|
|
{
|
|
struct perf_counts_values tmp;
|
|
|
|
if (!evsel->prev_raw_counts)
|
|
return;
|
|
|
|
if (cpu == -1) {
|
|
tmp = evsel->prev_raw_counts->aggr;
|
|
evsel->prev_raw_counts->aggr = *count;
|
|
} else {
|
|
tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
|
|
*perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
|
|
}
|
|
|
|
count->val = count->val - tmp.val;
|
|
count->ena = count->ena - tmp.ena;
|
|
count->run = count->run - tmp.run;
|
|
}
|
|
|
|
void perf_counts_values__scale(struct perf_counts_values *count,
|
|
bool scale, s8 *pscaled)
|
|
{
|
|
s8 scaled = 0;
|
|
|
|
if (scale) {
|
|
if (count->run == 0) {
|
|
scaled = -1;
|
|
count->val = 0;
|
|
} else if (count->run < count->ena) {
|
|
scaled = 1;
|
|
count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
|
|
}
|
|
} else
|
|
count->ena = count->run = 0;
|
|
|
|
if (pscaled)
|
|
*pscaled = scaled;
|
|
}
|
|
|
|
static int perf_evsel__read_size(struct perf_evsel *evsel)
|
|
{
|
|
u64 read_format = evsel->attr.read_format;
|
|
int entry = sizeof(u64); /* value */
|
|
int size = 0;
|
|
int nr = 1;
|
|
|
|
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
|
|
size += sizeof(u64);
|
|
|
|
if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
|
|
size += sizeof(u64);
|
|
|
|
if (read_format & PERF_FORMAT_ID)
|
|
entry += sizeof(u64);
|
|
|
|
if (read_format & PERF_FORMAT_GROUP) {
|
|
nr = evsel->nr_members;
|
|
size += sizeof(u64);
|
|
}
|
|
|
|
size += entry * nr;
|
|
return size;
|
|
}
|
|
|
|
int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
|
|
struct perf_counts_values *count)
|
|
{
|
|
size_t size = perf_evsel__read_size(evsel);
|
|
|
|
memset(count, 0, sizeof(*count));
|
|
|
|
if (FD(evsel, cpu, thread) < 0)
|
|
return -EINVAL;
|
|
|
|
if (readn(FD(evsel, cpu, thread), count->values, size) <= 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
perf_evsel__read_one(struct perf_evsel *evsel, int cpu, int thread)
|
|
{
|
|
struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
|
|
|
|
return perf_evsel__read(evsel, cpu, thread, count);
|
|
}
|
|
|
|
static void
|
|
perf_evsel__set_count(struct perf_evsel *counter, int cpu, int thread,
|
|
u64 val, u64 ena, u64 run)
|
|
{
|
|
struct perf_counts_values *count;
|
|
|
|
count = perf_counts(counter->counts, cpu, thread);
|
|
|
|
count->val = val;
|
|
count->ena = ena;
|
|
count->run = run;
|
|
count->loaded = true;
|
|
}
|
|
|
|
static int
|
|
perf_evsel__process_group_data(struct perf_evsel *leader,
|
|
int cpu, int thread, u64 *data)
|
|
{
|
|
u64 read_format = leader->attr.read_format;
|
|
struct sample_read_value *v;
|
|
u64 nr, ena = 0, run = 0, i;
|
|
|
|
nr = *data++;
|
|
|
|
if (nr != (u64) leader->nr_members)
|
|
return -EINVAL;
|
|
|
|
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
|
|
ena = *data++;
|
|
|
|
if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
|
|
run = *data++;
|
|
|
|
v = (struct sample_read_value *) data;
|
|
|
|
perf_evsel__set_count(leader, cpu, thread,
|
|
v[0].value, ena, run);
|
|
|
|
for (i = 1; i < nr; i++) {
|
|
struct perf_evsel *counter;
|
|
|
|
counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
|
|
if (!counter)
|
|
return -EINVAL;
|
|
|
|
perf_evsel__set_count(counter, cpu, thread,
|
|
v[i].value, ena, run);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
perf_evsel__read_group(struct perf_evsel *leader, int cpu, int thread)
|
|
{
|
|
struct perf_stat_evsel *ps = leader->stats;
|
|
u64 read_format = leader->attr.read_format;
|
|
int size = perf_evsel__read_size(leader);
|
|
u64 *data = ps->group_data;
|
|
|
|
if (!(read_format & PERF_FORMAT_ID))
|
|
return -EINVAL;
|
|
|
|
if (!perf_evsel__is_group_leader(leader))
|
|
return -EINVAL;
|
|
|
|
if (!data) {
|
|
data = zalloc(size);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
ps->group_data = data;
|
|
}
|
|
|
|
if (FD(leader, cpu, thread) < 0)
|
|
return -EINVAL;
|
|
|
|
if (readn(FD(leader, cpu, thread), data, size) <= 0)
|
|
return -errno;
|
|
|
|
return perf_evsel__process_group_data(leader, cpu, thread, data);
|
|
}
|
|
|
|
int perf_evsel__read_counter(struct perf_evsel *evsel, int cpu, int thread)
|
|
{
|
|
u64 read_format = evsel->attr.read_format;
|
|
|
|
if (read_format & PERF_FORMAT_GROUP)
|
|
return perf_evsel__read_group(evsel, cpu, thread);
|
|
else
|
|
return perf_evsel__read_one(evsel, cpu, thread);
|
|
}
|
|
|
|
int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
|
|
int cpu, int thread, bool scale)
|
|
{
|
|
struct perf_counts_values count;
|
|
size_t nv = scale ? 3 : 1;
|
|
|
|
if (FD(evsel, cpu, thread) < 0)
|
|
return -EINVAL;
|
|
|
|
if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
|
|
return -ENOMEM;
|
|
|
|
if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
|
|
return -errno;
|
|
|
|
perf_evsel__compute_deltas(evsel, cpu, thread, &count);
|
|
perf_counts_values__scale(&count, scale, NULL);
|
|
*perf_counts(evsel->counts, cpu, thread) = count;
|
|
return 0;
|
|
}
|
|
|
|
static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
|
|
{
|
|
struct perf_evsel *leader = evsel->leader;
|
|
int fd;
|
|
|
|
if (perf_evsel__is_group_leader(evsel))
|
|
return -1;
|
|
|
|
/*
|
|
* Leader must be already processed/open,
|
|
* if not it's a bug.
|
|
*/
|
|
BUG_ON(!leader->fd);
|
|
|
|
fd = FD(leader, cpu, thread);
|
|
BUG_ON(fd == -1);
|
|
|
|
return fd;
|
|
}
|
|
|
|
struct bit_names {
|
|
int bit;
|
|
const char *name;
|
|
};
|
|
|
|
static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
|
|
{
|
|
bool first_bit = true;
|
|
int i = 0;
|
|
|
|
do {
|
|
if (value & bits[i].bit) {
|
|
buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
|
|
first_bit = false;
|
|
}
|
|
} while (bits[++i].name != NULL);
|
|
}
|
|
|
|
static void __p_sample_type(char *buf, size_t size, u64 value)
|
|
{
|
|
#define bit_name(n) { PERF_SAMPLE_##n, #n }
|
|
struct bit_names bits[] = {
|
|
bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
|
|
bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
|
|
bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
|
|
bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
|
|
bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
|
|
bit_name(WEIGHT), bit_name(PHYS_ADDR),
|
|
{ .name = NULL, }
|
|
};
|
|
#undef bit_name
|
|
__p_bits(buf, size, value, bits);
|
|
}
|
|
|
|
static void __p_branch_sample_type(char *buf, size_t size, u64 value)
|
|
{
|
|
#define bit_name(n) { PERF_SAMPLE_BRANCH_##n, #n }
|
|
struct bit_names bits[] = {
|
|
bit_name(USER), bit_name(KERNEL), bit_name(HV), bit_name(ANY),
|
|
bit_name(ANY_CALL), bit_name(ANY_RETURN), bit_name(IND_CALL),
|
|
bit_name(ABORT_TX), bit_name(IN_TX), bit_name(NO_TX),
|
|
bit_name(COND), bit_name(CALL_STACK), bit_name(IND_JUMP),
|
|
bit_name(CALL), bit_name(NO_FLAGS), bit_name(NO_CYCLES),
|
|
{ .name = NULL, }
|
|
};
|
|
#undef bit_name
|
|
__p_bits(buf, size, value, bits);
|
|
}
|
|
|
|
static void __p_read_format(char *buf, size_t size, u64 value)
|
|
{
|
|
#define bit_name(n) { PERF_FORMAT_##n, #n }
|
|
struct bit_names bits[] = {
|
|
bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
|
|
bit_name(ID), bit_name(GROUP),
|
|
{ .name = NULL, }
|
|
};
|
|
#undef bit_name
|
|
__p_bits(buf, size, value, bits);
|
|
}
|
|
|
|
#define BUF_SIZE 1024
|
|
|
|
#define p_hex(val) snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
|
|
#define p_unsigned(val) snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
|
|
#define p_signed(val) snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
|
|
#define p_sample_type(val) __p_sample_type(buf, BUF_SIZE, val)
|
|
#define p_branch_sample_type(val) __p_branch_sample_type(buf, BUF_SIZE, val)
|
|
#define p_read_format(val) __p_read_format(buf, BUF_SIZE, val)
|
|
|
|
#define PRINT_ATTRn(_n, _f, _p) \
|
|
do { \
|
|
if (attr->_f) { \
|
|
_p(attr->_f); \
|
|
ret += attr__fprintf(fp, _n, buf, priv);\
|
|
} \
|
|
} while (0)
|
|
|
|
#define PRINT_ATTRf(_f, _p) PRINT_ATTRn(#_f, _f, _p)
|
|
|
|
int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
|
|
attr__fprintf_f attr__fprintf, void *priv)
|
|
{
|
|
char buf[BUF_SIZE];
|
|
int ret = 0;
|
|
|
|
PRINT_ATTRf(type, p_unsigned);
|
|
PRINT_ATTRf(size, p_unsigned);
|
|
PRINT_ATTRf(config, p_hex);
|
|
PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
|
|
PRINT_ATTRf(sample_type, p_sample_type);
|
|
PRINT_ATTRf(read_format, p_read_format);
|
|
|
|
PRINT_ATTRf(disabled, p_unsigned);
|
|
PRINT_ATTRf(inherit, p_unsigned);
|
|
PRINT_ATTRf(pinned, p_unsigned);
|
|
PRINT_ATTRf(exclusive, p_unsigned);
|
|
PRINT_ATTRf(exclude_user, p_unsigned);
|
|
PRINT_ATTRf(exclude_kernel, p_unsigned);
|
|
PRINT_ATTRf(exclude_hv, p_unsigned);
|
|
PRINT_ATTRf(exclude_idle, p_unsigned);
|
|
PRINT_ATTRf(mmap, p_unsigned);
|
|
PRINT_ATTRf(comm, p_unsigned);
|
|
PRINT_ATTRf(freq, p_unsigned);
|
|
PRINT_ATTRf(inherit_stat, p_unsigned);
|
|
PRINT_ATTRf(enable_on_exec, p_unsigned);
|
|
PRINT_ATTRf(task, p_unsigned);
|
|
PRINT_ATTRf(watermark, p_unsigned);
|
|
PRINT_ATTRf(precise_ip, p_unsigned);
|
|
PRINT_ATTRf(mmap_data, p_unsigned);
|
|
PRINT_ATTRf(sample_id_all, p_unsigned);
|
|
PRINT_ATTRf(exclude_host, p_unsigned);
|
|
PRINT_ATTRf(exclude_guest, p_unsigned);
|
|
PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
|
|
PRINT_ATTRf(exclude_callchain_user, p_unsigned);
|
|
PRINT_ATTRf(mmap2, p_unsigned);
|
|
PRINT_ATTRf(comm_exec, p_unsigned);
|
|
PRINT_ATTRf(use_clockid, p_unsigned);
|
|
PRINT_ATTRf(context_switch, p_unsigned);
|
|
PRINT_ATTRf(write_backward, p_unsigned);
|
|
PRINT_ATTRf(namespaces, p_unsigned);
|
|
|
|
PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
|
|
PRINT_ATTRf(bp_type, p_unsigned);
|
|
PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
|
|
PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
|
|
PRINT_ATTRf(branch_sample_type, p_branch_sample_type);
|
|
PRINT_ATTRf(sample_regs_user, p_hex);
|
|
PRINT_ATTRf(sample_stack_user, p_unsigned);
|
|
PRINT_ATTRf(clockid, p_signed);
|
|
PRINT_ATTRf(sample_regs_intr, p_hex);
|
|
PRINT_ATTRf(aux_watermark, p_unsigned);
|
|
PRINT_ATTRf(sample_max_stack, p_unsigned);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
|
|
void *priv __maybe_unused)
|
|
{
|
|
return fprintf(fp, " %-32s %s\n", name, val);
|
|
}
|
|
|
|
static void perf_evsel__remove_fd(struct perf_evsel *pos,
|
|
int nr_cpus, int nr_threads,
|
|
int thread_idx)
|
|
{
|
|
for (int cpu = 0; cpu < nr_cpus; cpu++)
|
|
for (int thread = thread_idx; thread < nr_threads - 1; thread++)
|
|
FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
|
|
}
|
|
|
|
static int update_fds(struct perf_evsel *evsel,
|
|
int nr_cpus, int cpu_idx,
|
|
int nr_threads, int thread_idx)
|
|
{
|
|
struct perf_evsel *pos;
|
|
|
|
if (cpu_idx >= nr_cpus || thread_idx >= nr_threads)
|
|
return -EINVAL;
|
|
|
|
evlist__for_each_entry(evsel->evlist, pos) {
|
|
nr_cpus = pos != evsel ? nr_cpus : cpu_idx;
|
|
|
|
perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
|
|
|
|
/*
|
|
* Since fds for next evsel has not been created,
|
|
* there is no need to iterate whole event list.
|
|
*/
|
|
if (pos == evsel)
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static bool ignore_missing_thread(struct perf_evsel *evsel,
|
|
int nr_cpus, int cpu,
|
|
struct thread_map *threads,
|
|
int thread, int err)
|
|
{
|
|
pid_t ignore_pid = thread_map__pid(threads, thread);
|
|
|
|
if (!evsel->ignore_missing_thread)
|
|
return false;
|
|
|
|
/* The system wide setup does not work with threads. */
|
|
if (evsel->system_wide)
|
|
return false;
|
|
|
|
/* The -ESRCH is perf event syscall errno for pid's not found. */
|
|
if (err != -ESRCH)
|
|
return false;
|
|
|
|
/* If there's only one thread, let it fail. */
|
|
if (threads->nr == 1)
|
|
return false;
|
|
|
|
/*
|
|
* We should remove fd for missing_thread first
|
|
* because thread_map__remove() will decrease threads->nr.
|
|
*/
|
|
if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread))
|
|
return false;
|
|
|
|
if (thread_map__remove(threads, thread))
|
|
return false;
|
|
|
|
pr_warning("WARNING: Ignored open failure for pid %d\n",
|
|
ignore_pid);
|
|
return true;
|
|
}
|
|
|
|
int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
|
|
struct thread_map *threads)
|
|
{
|
|
int cpu, thread, nthreads;
|
|
unsigned long flags = PERF_FLAG_FD_CLOEXEC;
|
|
int pid = -1, err;
|
|
enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
|
|
|
|
if (perf_missing_features.write_backward && evsel->attr.write_backward)
|
|
return -EINVAL;
|
|
|
|
if (cpus == NULL) {
|
|
static struct cpu_map *empty_cpu_map;
|
|
|
|
if (empty_cpu_map == NULL) {
|
|
empty_cpu_map = cpu_map__dummy_new();
|
|
if (empty_cpu_map == NULL)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
cpus = empty_cpu_map;
|
|
}
|
|
|
|
if (threads == NULL) {
|
|
static struct thread_map *empty_thread_map;
|
|
|
|
if (empty_thread_map == NULL) {
|
|
empty_thread_map = thread_map__new_by_tid(-1);
|
|
if (empty_thread_map == NULL)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
threads = empty_thread_map;
|
|
}
|
|
|
|
if (evsel->system_wide)
|
|
nthreads = 1;
|
|
else
|
|
nthreads = threads->nr;
|
|
|
|
if (evsel->fd == NULL &&
|
|
perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
|
|
return -ENOMEM;
|
|
|
|
if (evsel->cgrp) {
|
|
flags |= PERF_FLAG_PID_CGROUP;
|
|
pid = evsel->cgrp->fd;
|
|
}
|
|
|
|
fallback_missing_features:
|
|
if (perf_missing_features.clockid_wrong)
|
|
evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
|
|
if (perf_missing_features.clockid) {
|
|
evsel->attr.use_clockid = 0;
|
|
evsel->attr.clockid = 0;
|
|
}
|
|
if (perf_missing_features.cloexec)
|
|
flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
|
|
if (perf_missing_features.mmap2)
|
|
evsel->attr.mmap2 = 0;
|
|
if (perf_missing_features.exclude_guest)
|
|
evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
|
|
if (perf_missing_features.lbr_flags)
|
|
evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
|
|
PERF_SAMPLE_BRANCH_NO_CYCLES);
|
|
if (perf_missing_features.group_read && evsel->attr.inherit)
|
|
evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
|
|
retry_sample_id:
|
|
if (perf_missing_features.sample_id_all)
|
|
evsel->attr.sample_id_all = 0;
|
|
|
|
if (verbose >= 2) {
|
|
fprintf(stderr, "%.60s\n", graph_dotted_line);
|
|
fprintf(stderr, "perf_event_attr:\n");
|
|
perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL);
|
|
fprintf(stderr, "%.60s\n", graph_dotted_line);
|
|
}
|
|
|
|
for (cpu = 0; cpu < cpus->nr; cpu++) {
|
|
|
|
for (thread = 0; thread < nthreads; thread++) {
|
|
int fd, group_fd;
|
|
|
|
if (!evsel->cgrp && !evsel->system_wide)
|
|
pid = thread_map__pid(threads, thread);
|
|
|
|
group_fd = get_group_fd(evsel, cpu, thread);
|
|
retry_open:
|
|
pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
|
|
pid, cpus->map[cpu], group_fd, flags);
|
|
|
|
test_attr__ready();
|
|
|
|
fd = sys_perf_event_open(&evsel->attr, pid, cpus->map[cpu],
|
|
group_fd, flags);
|
|
|
|
FD(evsel, cpu, thread) = fd;
|
|
|
|
if (fd < 0) {
|
|
err = -errno;
|
|
|
|
if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) {
|
|
/*
|
|
* We just removed 1 thread, so take a step
|
|
* back on thread index and lower the upper
|
|
* nthreads limit.
|
|
*/
|
|
nthreads--;
|
|
thread--;
|
|
|
|
/* ... and pretend like nothing have happened. */
|
|
err = 0;
|
|
continue;
|
|
}
|
|
|
|
pr_debug2("\nsys_perf_event_open failed, error %d\n",
|
|
err);
|
|
goto try_fallback;
|
|
}
|
|
|
|
pr_debug2(" = %d\n", fd);
|
|
|
|
if (evsel->bpf_fd >= 0) {
|
|
int evt_fd = fd;
|
|
int bpf_fd = evsel->bpf_fd;
|
|
|
|
err = ioctl(evt_fd,
|
|
PERF_EVENT_IOC_SET_BPF,
|
|
bpf_fd);
|
|
if (err && errno != EEXIST) {
|
|
pr_err("failed to attach bpf fd %d: %s\n",
|
|
bpf_fd, strerror(errno));
|
|
err = -EINVAL;
|
|
goto out_close;
|
|
}
|
|
}
|
|
|
|
set_rlimit = NO_CHANGE;
|
|
|
|
/*
|
|
* If we succeeded but had to kill clockid, fail and
|
|
* have perf_evsel__open_strerror() print us a nice
|
|
* error.
|
|
*/
|
|
if (perf_missing_features.clockid ||
|
|
perf_missing_features.clockid_wrong) {
|
|
err = -EINVAL;
|
|
goto out_close;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
try_fallback:
|
|
/*
|
|
* perf stat needs between 5 and 22 fds per CPU. When we run out
|
|
* of them try to increase the limits.
|
|
*/
|
|
if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
|
|
struct rlimit l;
|
|
int old_errno = errno;
|
|
|
|
if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
|
|
if (set_rlimit == NO_CHANGE)
|
|
l.rlim_cur = l.rlim_max;
|
|
else {
|
|
l.rlim_cur = l.rlim_max + 1000;
|
|
l.rlim_max = l.rlim_cur;
|
|
}
|
|
if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
|
|
set_rlimit++;
|
|
errno = old_errno;
|
|
goto retry_open;
|
|
}
|
|
}
|
|
errno = old_errno;
|
|
}
|
|
|
|
if (err != -EINVAL || cpu > 0 || thread > 0)
|
|
goto out_close;
|
|
|
|
/*
|
|
* Must probe features in the order they were added to the
|
|
* perf_event_attr interface.
|
|
*/
|
|
if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
|
|
perf_missing_features.write_backward = true;
|
|
pr_debug2("switching off write_backward\n");
|
|
goto out_close;
|
|
} else if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
|
|
perf_missing_features.clockid_wrong = true;
|
|
pr_debug2("switching off clockid\n");
|
|
goto fallback_missing_features;
|
|
} else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
|
|
perf_missing_features.clockid = true;
|
|
pr_debug2("switching off use_clockid\n");
|
|
goto fallback_missing_features;
|
|
} else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
|
|
perf_missing_features.cloexec = true;
|
|
pr_debug2("switching off cloexec flag\n");
|
|
goto fallback_missing_features;
|
|
} else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
|
|
perf_missing_features.mmap2 = true;
|
|
pr_debug2("switching off mmap2\n");
|
|
goto fallback_missing_features;
|
|
} else if (!perf_missing_features.exclude_guest &&
|
|
(evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
|
|
perf_missing_features.exclude_guest = true;
|
|
pr_debug2("switching off exclude_guest, exclude_host\n");
|
|
goto fallback_missing_features;
|
|
} else if (!perf_missing_features.sample_id_all) {
|
|
perf_missing_features.sample_id_all = true;
|
|
pr_debug2("switching off sample_id_all\n");
|
|
goto retry_sample_id;
|
|
} else if (!perf_missing_features.lbr_flags &&
|
|
(evsel->attr.branch_sample_type &
|
|
(PERF_SAMPLE_BRANCH_NO_CYCLES |
|
|
PERF_SAMPLE_BRANCH_NO_FLAGS))) {
|
|
perf_missing_features.lbr_flags = true;
|
|
pr_debug2("switching off branch sample type no (cycles/flags)\n");
|
|
goto fallback_missing_features;
|
|
} else if (!perf_missing_features.group_read &&
|
|
evsel->attr.inherit &&
|
|
(evsel->attr.read_format & PERF_FORMAT_GROUP) &&
|
|
perf_evsel__is_group_leader(evsel)) {
|
|
perf_missing_features.group_read = true;
|
|
pr_debug2("switching off group read\n");
|
|
goto fallback_missing_features;
|
|
}
|
|
out_close:
|
|
if (err)
|
|
threads->err_thread = thread;
|
|
|
|
do {
|
|
while (--thread >= 0) {
|
|
close(FD(evsel, cpu, thread));
|
|
FD(evsel, cpu, thread) = -1;
|
|
}
|
|
thread = nthreads;
|
|
} while (--cpu >= 0);
|
|
return err;
|
|
}
|
|
|
|
void perf_evsel__close(struct perf_evsel *evsel)
|
|
{
|
|
if (evsel->fd == NULL)
|
|
return;
|
|
|
|
perf_evsel__close_fd(evsel);
|
|
perf_evsel__free_fd(evsel);
|
|
}
|
|
|
|
int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
|
|
struct cpu_map *cpus)
|
|
{
|
|
return perf_evsel__open(evsel, cpus, NULL);
|
|
}
|
|
|
|
int perf_evsel__open_per_thread(struct perf_evsel *evsel,
|
|
struct thread_map *threads)
|
|
{
|
|
return perf_evsel__open(evsel, NULL, threads);
|
|
}
|
|
|
|
static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
|
|
const union perf_event *event,
|
|
struct perf_sample *sample)
|
|
{
|
|
u64 type = evsel->attr.sample_type;
|
|
const u64 *array = event->sample.array;
|
|
bool swapped = evsel->needs_swap;
|
|
union u64_swap u;
|
|
|
|
array += ((event->header.size -
|
|
sizeof(event->header)) / sizeof(u64)) - 1;
|
|
|
|
if (type & PERF_SAMPLE_IDENTIFIER) {
|
|
sample->id = *array;
|
|
array--;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_CPU) {
|
|
u.val64 = *array;
|
|
if (swapped) {
|
|
/* undo swap of u64, then swap on individual u32s */
|
|
u.val64 = bswap_64(u.val64);
|
|
u.val32[0] = bswap_32(u.val32[0]);
|
|
}
|
|
|
|
sample->cpu = u.val32[0];
|
|
array--;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_STREAM_ID) {
|
|
sample->stream_id = *array;
|
|
array--;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_ID) {
|
|
sample->id = *array;
|
|
array--;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_TIME) {
|
|
sample->time = *array;
|
|
array--;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_TID) {
|
|
u.val64 = *array;
|
|
if (swapped) {
|
|
/* undo swap of u64, then swap on individual u32s */
|
|
u.val64 = bswap_64(u.val64);
|
|
u.val32[0] = bswap_32(u.val32[0]);
|
|
u.val32[1] = bswap_32(u.val32[1]);
|
|
}
|
|
|
|
sample->pid = u.val32[0];
|
|
sample->tid = u.val32[1];
|
|
array--;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline bool overflow(const void *endp, u16 max_size, const void *offset,
|
|
u64 size)
|
|
{
|
|
return size > max_size || offset + size > endp;
|
|
}
|
|
|
|
#define OVERFLOW_CHECK(offset, size, max_size) \
|
|
do { \
|
|
if (overflow(endp, (max_size), (offset), (size))) \
|
|
return -EFAULT; \
|
|
} while (0)
|
|
|
|
#define OVERFLOW_CHECK_u64(offset) \
|
|
OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
|
|
|
|
static int
|
|
perf_event__check_size(union perf_event *event, unsigned int sample_size)
|
|
{
|
|
/*
|
|
* The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
|
|
* up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
|
|
* check the format does not go past the end of the event.
|
|
*/
|
|
if (sample_size + sizeof(event->header) > event->header.size)
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
|
|
struct perf_sample *data)
|
|
{
|
|
u64 type = evsel->attr.sample_type;
|
|
bool swapped = evsel->needs_swap;
|
|
const u64 *array;
|
|
u16 max_size = event->header.size;
|
|
const void *endp = (void *)event + max_size;
|
|
u64 sz;
|
|
|
|
/*
|
|
* used for cross-endian analysis. See git commit 65014ab3
|
|
* for why this goofiness is needed.
|
|
*/
|
|
union u64_swap u;
|
|
|
|
memset(data, 0, sizeof(*data));
|
|
data->cpu = data->pid = data->tid = -1;
|
|
data->stream_id = data->id = data->time = -1ULL;
|
|
data->period = evsel->attr.sample_period;
|
|
data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
|
|
data->misc = event->header.misc;
|
|
data->id = -1ULL;
|
|
data->data_src = PERF_MEM_DATA_SRC_NONE;
|
|
|
|
if (event->header.type != PERF_RECORD_SAMPLE) {
|
|
if (!evsel->attr.sample_id_all)
|
|
return 0;
|
|
return perf_evsel__parse_id_sample(evsel, event, data);
|
|
}
|
|
|
|
array = event->sample.array;
|
|
|
|
if (perf_event__check_size(event, evsel->sample_size))
|
|
return -EFAULT;
|
|
|
|
if (type & PERF_SAMPLE_IDENTIFIER) {
|
|
data->id = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_IP) {
|
|
data->ip = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_TID) {
|
|
u.val64 = *array;
|
|
if (swapped) {
|
|
/* undo swap of u64, then swap on individual u32s */
|
|
u.val64 = bswap_64(u.val64);
|
|
u.val32[0] = bswap_32(u.val32[0]);
|
|
u.val32[1] = bswap_32(u.val32[1]);
|
|
}
|
|
|
|
data->pid = u.val32[0];
|
|
data->tid = u.val32[1];
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_TIME) {
|
|
data->time = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_ADDR) {
|
|
data->addr = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_ID) {
|
|
data->id = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_STREAM_ID) {
|
|
data->stream_id = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_CPU) {
|
|
|
|
u.val64 = *array;
|
|
if (swapped) {
|
|
/* undo swap of u64, then swap on individual u32s */
|
|
u.val64 = bswap_64(u.val64);
|
|
u.val32[0] = bswap_32(u.val32[0]);
|
|
}
|
|
|
|
data->cpu = u.val32[0];
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_PERIOD) {
|
|
data->period = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_READ) {
|
|
u64 read_format = evsel->attr.read_format;
|
|
|
|
OVERFLOW_CHECK_u64(array);
|
|
if (read_format & PERF_FORMAT_GROUP)
|
|
data->read.group.nr = *array;
|
|
else
|
|
data->read.one.value = *array;
|
|
|
|
array++;
|
|
|
|
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
|
|
OVERFLOW_CHECK_u64(array);
|
|
data->read.time_enabled = *array;
|
|
array++;
|
|
}
|
|
|
|
if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
|
|
OVERFLOW_CHECK_u64(array);
|
|
data->read.time_running = *array;
|
|
array++;
|
|
}
|
|
|
|
/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
|
|
if (read_format & PERF_FORMAT_GROUP) {
|
|
const u64 max_group_nr = UINT64_MAX /
|
|
sizeof(struct sample_read_value);
|
|
|
|
if (data->read.group.nr > max_group_nr)
|
|
return -EFAULT;
|
|
sz = data->read.group.nr *
|
|
sizeof(struct sample_read_value);
|
|
OVERFLOW_CHECK(array, sz, max_size);
|
|
data->read.group.values =
|
|
(struct sample_read_value *)array;
|
|
array = (void *)array + sz;
|
|
} else {
|
|
OVERFLOW_CHECK_u64(array);
|
|
data->read.one.id = *array;
|
|
array++;
|
|
}
|
|
}
|
|
|
|
if (evsel__has_callchain(evsel)) {
|
|
const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
|
|
|
|
OVERFLOW_CHECK_u64(array);
|
|
data->callchain = (struct ip_callchain *)array++;
|
|
if (data->callchain->nr > max_callchain_nr)
|
|
return -EFAULT;
|
|
sz = data->callchain->nr * sizeof(u64);
|
|
OVERFLOW_CHECK(array, sz, max_size);
|
|
array = (void *)array + sz;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_RAW) {
|
|
OVERFLOW_CHECK_u64(array);
|
|
u.val64 = *array;
|
|
|
|
/*
|
|
* Undo swap of u64, then swap on individual u32s,
|
|
* get the size of the raw area and undo all of the
|
|
* swap. The pevent interface handles endianity by
|
|
* itself.
|
|
*/
|
|
if (swapped) {
|
|
u.val64 = bswap_64(u.val64);
|
|
u.val32[0] = bswap_32(u.val32[0]);
|
|
u.val32[1] = bswap_32(u.val32[1]);
|
|
}
|
|
data->raw_size = u.val32[0];
|
|
|
|
/*
|
|
* The raw data is aligned on 64bits including the
|
|
* u32 size, so it's safe to use mem_bswap_64.
|
|
*/
|
|
if (swapped)
|
|
mem_bswap_64((void *) array, data->raw_size);
|
|
|
|
array = (void *)array + sizeof(u32);
|
|
|
|
OVERFLOW_CHECK(array, data->raw_size, max_size);
|
|
data->raw_data = (void *)array;
|
|
array = (void *)array + data->raw_size;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_BRANCH_STACK) {
|
|
const u64 max_branch_nr = UINT64_MAX /
|
|
sizeof(struct branch_entry);
|
|
|
|
OVERFLOW_CHECK_u64(array);
|
|
data->branch_stack = (struct branch_stack *)array++;
|
|
|
|
if (data->branch_stack->nr > max_branch_nr)
|
|
return -EFAULT;
|
|
sz = data->branch_stack->nr * sizeof(struct branch_entry);
|
|
OVERFLOW_CHECK(array, sz, max_size);
|
|
array = (void *)array + sz;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_REGS_USER) {
|
|
OVERFLOW_CHECK_u64(array);
|
|
data->user_regs.abi = *array;
|
|
array++;
|
|
|
|
if (data->user_regs.abi) {
|
|
u64 mask = evsel->attr.sample_regs_user;
|
|
|
|
sz = hweight_long(mask) * sizeof(u64);
|
|
OVERFLOW_CHECK(array, sz, max_size);
|
|
data->user_regs.mask = mask;
|
|
data->user_regs.regs = (u64 *)array;
|
|
array = (void *)array + sz;
|
|
}
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_STACK_USER) {
|
|
OVERFLOW_CHECK_u64(array);
|
|
sz = *array++;
|
|
|
|
data->user_stack.offset = ((char *)(array - 1)
|
|
- (char *) event);
|
|
|
|
if (!sz) {
|
|
data->user_stack.size = 0;
|
|
} else {
|
|
OVERFLOW_CHECK(array, sz, max_size);
|
|
data->user_stack.data = (char *)array;
|
|
array = (void *)array + sz;
|
|
OVERFLOW_CHECK_u64(array);
|
|
data->user_stack.size = *array++;
|
|
if (WARN_ONCE(data->user_stack.size > sz,
|
|
"user stack dump failure\n"))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_WEIGHT) {
|
|
OVERFLOW_CHECK_u64(array);
|
|
data->weight = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_DATA_SRC) {
|
|
OVERFLOW_CHECK_u64(array);
|
|
data->data_src = *array;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_TRANSACTION) {
|
|
OVERFLOW_CHECK_u64(array);
|
|
data->transaction = *array;
|
|
array++;
|
|
}
|
|
|
|
data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
|
|
if (type & PERF_SAMPLE_REGS_INTR) {
|
|
OVERFLOW_CHECK_u64(array);
|
|
data->intr_regs.abi = *array;
|
|
array++;
|
|
|
|
if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
|
|
u64 mask = evsel->attr.sample_regs_intr;
|
|
|
|
sz = hweight_long(mask) * sizeof(u64);
|
|
OVERFLOW_CHECK(array, sz, max_size);
|
|
data->intr_regs.mask = mask;
|
|
data->intr_regs.regs = (u64 *)array;
|
|
array = (void *)array + sz;
|
|
}
|
|
}
|
|
|
|
data->phys_addr = 0;
|
|
if (type & PERF_SAMPLE_PHYS_ADDR) {
|
|
data->phys_addr = *array;
|
|
array++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int perf_evsel__parse_sample_timestamp(struct perf_evsel *evsel,
|
|
union perf_event *event,
|
|
u64 *timestamp)
|
|
{
|
|
u64 type = evsel->attr.sample_type;
|
|
const u64 *array;
|
|
|
|
if (!(type & PERF_SAMPLE_TIME))
|
|
return -1;
|
|
|
|
if (event->header.type != PERF_RECORD_SAMPLE) {
|
|
struct perf_sample data = {
|
|
.time = -1ULL,
|
|
};
|
|
|
|
if (!evsel->attr.sample_id_all)
|
|
return -1;
|
|
if (perf_evsel__parse_id_sample(evsel, event, &data))
|
|
return -1;
|
|
|
|
*timestamp = data.time;
|
|
return 0;
|
|
}
|
|
|
|
array = event->sample.array;
|
|
|
|
if (perf_event__check_size(event, evsel->sample_size))
|
|
return -EFAULT;
|
|
|
|
if (type & PERF_SAMPLE_IDENTIFIER)
|
|
array++;
|
|
|
|
if (type & PERF_SAMPLE_IP)
|
|
array++;
|
|
|
|
if (type & PERF_SAMPLE_TID)
|
|
array++;
|
|
|
|
if (type & PERF_SAMPLE_TIME)
|
|
*timestamp = *array;
|
|
|
|
return 0;
|
|
}
|
|
|
|
size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
|
|
u64 read_format)
|
|
{
|
|
size_t sz, result = sizeof(struct sample_event);
|
|
|
|
if (type & PERF_SAMPLE_IDENTIFIER)
|
|
result += sizeof(u64);
|
|
|
|
if (type & PERF_SAMPLE_IP)
|
|
result += sizeof(u64);
|
|
|
|
if (type & PERF_SAMPLE_TID)
|
|
result += sizeof(u64);
|
|
|
|
if (type & PERF_SAMPLE_TIME)
|
|
result += sizeof(u64);
|
|
|
|
if (type & PERF_SAMPLE_ADDR)
|
|
result += sizeof(u64);
|
|
|
|
if (type & PERF_SAMPLE_ID)
|
|
result += sizeof(u64);
|
|
|
|
if (type & PERF_SAMPLE_STREAM_ID)
|
|
result += sizeof(u64);
|
|
|
|
if (type & PERF_SAMPLE_CPU)
|
|
result += sizeof(u64);
|
|
|
|
if (type & PERF_SAMPLE_PERIOD)
|
|
result += sizeof(u64);
|
|
|
|
if (type & PERF_SAMPLE_READ) {
|
|
result += sizeof(u64);
|
|
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
|
|
result += sizeof(u64);
|
|
if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
|
|
result += sizeof(u64);
|
|
/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
|
|
if (read_format & PERF_FORMAT_GROUP) {
|
|
sz = sample->read.group.nr *
|
|
sizeof(struct sample_read_value);
|
|
result += sz;
|
|
} else {
|
|
result += sizeof(u64);
|
|
}
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_CALLCHAIN) {
|
|
sz = (sample->callchain->nr + 1) * sizeof(u64);
|
|
result += sz;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_RAW) {
|
|
result += sizeof(u32);
|
|
result += sample->raw_size;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_BRANCH_STACK) {
|
|
sz = sample->branch_stack->nr * sizeof(struct branch_entry);
|
|
sz += sizeof(u64);
|
|
result += sz;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_REGS_USER) {
|
|
if (sample->user_regs.abi) {
|
|
result += sizeof(u64);
|
|
sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
|
|
result += sz;
|
|
} else {
|
|
result += sizeof(u64);
|
|
}
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_STACK_USER) {
|
|
sz = sample->user_stack.size;
|
|
result += sizeof(u64);
|
|
if (sz) {
|
|
result += sz;
|
|
result += sizeof(u64);
|
|
}
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_WEIGHT)
|
|
result += sizeof(u64);
|
|
|
|
if (type & PERF_SAMPLE_DATA_SRC)
|
|
result += sizeof(u64);
|
|
|
|
if (type & PERF_SAMPLE_TRANSACTION)
|
|
result += sizeof(u64);
|
|
|
|
if (type & PERF_SAMPLE_REGS_INTR) {
|
|
if (sample->intr_regs.abi) {
|
|
result += sizeof(u64);
|
|
sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
|
|
result += sz;
|
|
} else {
|
|
result += sizeof(u64);
|
|
}
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_PHYS_ADDR)
|
|
result += sizeof(u64);
|
|
|
|
return result;
|
|
}
|
|
|
|
int perf_event__synthesize_sample(union perf_event *event, u64 type,
|
|
u64 read_format,
|
|
const struct perf_sample *sample)
|
|
{
|
|
u64 *array;
|
|
size_t sz;
|
|
/*
|
|
* used for cross-endian analysis. See git commit 65014ab3
|
|
* for why this goofiness is needed.
|
|
*/
|
|
union u64_swap u;
|
|
|
|
array = event->sample.array;
|
|
|
|
if (type & PERF_SAMPLE_IDENTIFIER) {
|
|
*array = sample->id;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_IP) {
|
|
*array = sample->ip;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_TID) {
|
|
u.val32[0] = sample->pid;
|
|
u.val32[1] = sample->tid;
|
|
*array = u.val64;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_TIME) {
|
|
*array = sample->time;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_ADDR) {
|
|
*array = sample->addr;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_ID) {
|
|
*array = sample->id;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_STREAM_ID) {
|
|
*array = sample->stream_id;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_CPU) {
|
|
u.val32[0] = sample->cpu;
|
|
u.val32[1] = 0;
|
|
*array = u.val64;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_PERIOD) {
|
|
*array = sample->period;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_READ) {
|
|
if (read_format & PERF_FORMAT_GROUP)
|
|
*array = sample->read.group.nr;
|
|
else
|
|
*array = sample->read.one.value;
|
|
array++;
|
|
|
|
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
|
|
*array = sample->read.time_enabled;
|
|
array++;
|
|
}
|
|
|
|
if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
|
|
*array = sample->read.time_running;
|
|
array++;
|
|
}
|
|
|
|
/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
|
|
if (read_format & PERF_FORMAT_GROUP) {
|
|
sz = sample->read.group.nr *
|
|
sizeof(struct sample_read_value);
|
|
memcpy(array, sample->read.group.values, sz);
|
|
array = (void *)array + sz;
|
|
} else {
|
|
*array = sample->read.one.id;
|
|
array++;
|
|
}
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_CALLCHAIN) {
|
|
sz = (sample->callchain->nr + 1) * sizeof(u64);
|
|
memcpy(array, sample->callchain, sz);
|
|
array = (void *)array + sz;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_RAW) {
|
|
u.val32[0] = sample->raw_size;
|
|
*array = u.val64;
|
|
array = (void *)array + sizeof(u32);
|
|
|
|
memcpy(array, sample->raw_data, sample->raw_size);
|
|
array = (void *)array + sample->raw_size;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_BRANCH_STACK) {
|
|
sz = sample->branch_stack->nr * sizeof(struct branch_entry);
|
|
sz += sizeof(u64);
|
|
memcpy(array, sample->branch_stack, sz);
|
|
array = (void *)array + sz;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_REGS_USER) {
|
|
if (sample->user_regs.abi) {
|
|
*array++ = sample->user_regs.abi;
|
|
sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
|
|
memcpy(array, sample->user_regs.regs, sz);
|
|
array = (void *)array + sz;
|
|
} else {
|
|
*array++ = 0;
|
|
}
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_STACK_USER) {
|
|
sz = sample->user_stack.size;
|
|
*array++ = sz;
|
|
if (sz) {
|
|
memcpy(array, sample->user_stack.data, sz);
|
|
array = (void *)array + sz;
|
|
*array++ = sz;
|
|
}
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_WEIGHT) {
|
|
*array = sample->weight;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_DATA_SRC) {
|
|
*array = sample->data_src;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_TRANSACTION) {
|
|
*array = sample->transaction;
|
|
array++;
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_REGS_INTR) {
|
|
if (sample->intr_regs.abi) {
|
|
*array++ = sample->intr_regs.abi;
|
|
sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
|
|
memcpy(array, sample->intr_regs.regs, sz);
|
|
array = (void *)array + sz;
|
|
} else {
|
|
*array++ = 0;
|
|
}
|
|
}
|
|
|
|
if (type & PERF_SAMPLE_PHYS_ADDR) {
|
|
*array = sample->phys_addr;
|
|
array++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
|
|
{
|
|
return tep_find_field(evsel->tp_format, name);
|
|
}
|
|
|
|
void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
|
|
const char *name)
|
|
{
|
|
struct format_field *field = perf_evsel__field(evsel, name);
|
|
int offset;
|
|
|
|
if (!field)
|
|
return NULL;
|
|
|
|
offset = field->offset;
|
|
|
|
if (field->flags & FIELD_IS_DYNAMIC) {
|
|
offset = *(int *)(sample->raw_data + field->offset);
|
|
offset &= 0xffff;
|
|
}
|
|
|
|
return sample->raw_data + offset;
|
|
}
|
|
|
|
u64 format_field__intval(struct format_field *field, struct perf_sample *sample,
|
|
bool needs_swap)
|
|
{
|
|
u64 value;
|
|
void *ptr = sample->raw_data + field->offset;
|
|
|
|
switch (field->size) {
|
|
case 1:
|
|
return *(u8 *)ptr;
|
|
case 2:
|
|
value = *(u16 *)ptr;
|
|
break;
|
|
case 4:
|
|
value = *(u32 *)ptr;
|
|
break;
|
|
case 8:
|
|
memcpy(&value, ptr, sizeof(u64));
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
if (!needs_swap)
|
|
return value;
|
|
|
|
switch (field->size) {
|
|
case 2:
|
|
return bswap_16(value);
|
|
case 4:
|
|
return bswap_32(value);
|
|
case 8:
|
|
return bswap_64(value);
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
|
|
const char *name)
|
|
{
|
|
struct format_field *field = perf_evsel__field(evsel, name);
|
|
|
|
if (!field)
|
|
return 0;
|
|
|
|
return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
|
|
}
|
|
|
|
bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
|
|
char *msg, size_t msgsize)
|
|
{
|
|
int paranoid;
|
|
|
|
if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
|
|
evsel->attr.type == PERF_TYPE_HARDWARE &&
|
|
evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
|
|
/*
|
|
* If it's cycles then fall back to hrtimer based
|
|
* cpu-clock-tick sw counter, which is always available even if
|
|
* no PMU support.
|
|
*
|
|
* PPC returns ENXIO until 2.6.37 (behavior changed with commit
|
|
* b0a873e).
|
|
*/
|
|
scnprintf(msg, msgsize, "%s",
|
|
"The cycles event is not supported, trying to fall back to cpu-clock-ticks");
|
|
|
|
evsel->attr.type = PERF_TYPE_SOFTWARE;
|
|
evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
|
|
|
|
zfree(&evsel->name);
|
|
return true;
|
|
} else if (err == EACCES && !evsel->attr.exclude_kernel &&
|
|
(paranoid = perf_event_paranoid()) > 1) {
|
|
const char *name = perf_evsel__name(evsel);
|
|
char *new_name;
|
|
const char *sep = ":";
|
|
|
|
/* Is there already the separator in the name. */
|
|
if (strchr(name, '/') ||
|
|
strchr(name, ':'))
|
|
sep = "";
|
|
|
|
if (asprintf(&new_name, "%s%su", name, sep) < 0)
|
|
return false;
|
|
|
|
if (evsel->name)
|
|
free(evsel->name);
|
|
evsel->name = new_name;
|
|
scnprintf(msg, msgsize,
|
|
"kernel.perf_event_paranoid=%d, trying to fall back to excluding kernel samples", paranoid);
|
|
evsel->attr.exclude_kernel = 1;
|
|
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool find_process(const char *name)
|
|
{
|
|
size_t len = strlen(name);
|
|
DIR *dir;
|
|
struct dirent *d;
|
|
int ret = -1;
|
|
|
|
dir = opendir(procfs__mountpoint());
|
|
if (!dir)
|
|
return false;
|
|
|
|
/* Walk through the directory. */
|
|
while (ret && (d = readdir(dir)) != NULL) {
|
|
char path[PATH_MAX];
|
|
char *data;
|
|
size_t size;
|
|
|
|
if ((d->d_type != DT_DIR) ||
|
|
!strcmp(".", d->d_name) ||
|
|
!strcmp("..", d->d_name))
|
|
continue;
|
|
|
|
scnprintf(path, sizeof(path), "%s/%s/comm",
|
|
procfs__mountpoint(), d->d_name);
|
|
|
|
if (filename__read_str(path, &data, &size))
|
|
continue;
|
|
|
|
ret = strncmp(name, data, len);
|
|
free(data);
|
|
}
|
|
|
|
closedir(dir);
|
|
return ret ? false : true;
|
|
}
|
|
|
|
int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
|
|
int err, char *msg, size_t size)
|
|
{
|
|
char sbuf[STRERR_BUFSIZE];
|
|
int printed = 0;
|
|
|
|
switch (err) {
|
|
case EPERM:
|
|
case EACCES:
|
|
if (err == EPERM)
|
|
printed = scnprintf(msg, size,
|
|
"No permission to enable %s event.\n\n",
|
|
perf_evsel__name(evsel));
|
|
|
|
return scnprintf(msg + printed, size - printed,
|
|
"You may not have permission to collect %sstats.\n\n"
|
|
"Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
|
|
"which controls use of the performance events system by\n"
|
|
"unprivileged users (without CAP_SYS_ADMIN).\n\n"
|
|
"The current value is %d:\n\n"
|
|
" -1: Allow use of (almost) all events by all users\n"
|
|
" Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
|
|
">= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN\n"
|
|
" Disallow raw tracepoint access by users without CAP_SYS_ADMIN\n"
|
|
">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
|
|
">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n"
|
|
"To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
|
|
" kernel.perf_event_paranoid = -1\n" ,
|
|
target->system_wide ? "system-wide " : "",
|
|
perf_event_paranoid());
|
|
case ENOENT:
|
|
return scnprintf(msg, size, "The %s event is not supported.",
|
|
perf_evsel__name(evsel));
|
|
case EMFILE:
|
|
return scnprintf(msg, size, "%s",
|
|
"Too many events are opened.\n"
|
|
"Probably the maximum number of open file descriptors has been reached.\n"
|
|
"Hint: Try again after reducing the number of events.\n"
|
|
"Hint: Try increasing the limit with 'ulimit -n <limit>'");
|
|
case ENOMEM:
|
|
if (evsel__has_callchain(evsel) &&
|
|
access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
|
|
return scnprintf(msg, size,
|
|
"Not enough memory to setup event with callchain.\n"
|
|
"Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
|
|
"Hint: Current value: %d", sysctl__max_stack());
|
|
break;
|
|
case ENODEV:
|
|
if (target->cpu_list)
|
|
return scnprintf(msg, size, "%s",
|
|
"No such device - did you specify an out-of-range profile CPU?");
|
|
break;
|
|
case EOPNOTSUPP:
|
|
if (evsel->attr.sample_period != 0)
|
|
return scnprintf(msg, size,
|
|
"%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
|
|
perf_evsel__name(evsel));
|
|
if (evsel->attr.precise_ip)
|
|
return scnprintf(msg, size, "%s",
|
|
"\'precise\' request may not be supported. Try removing 'p' modifier.");
|
|
#if defined(__i386__) || defined(__x86_64__)
|
|
if (evsel->attr.type == PERF_TYPE_HARDWARE)
|
|
return scnprintf(msg, size, "%s",
|
|
"No hardware sampling interrupt available.\n");
|
|
#endif
|
|
break;
|
|
case EBUSY:
|
|
if (find_process("oprofiled"))
|
|
return scnprintf(msg, size,
|
|
"The PMU counters are busy/taken by another profiler.\n"
|
|
"We found oprofile daemon running, please stop it and try again.");
|
|
break;
|
|
case EINVAL:
|
|
if (evsel->attr.write_backward && perf_missing_features.write_backward)
|
|
return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
|
|
if (perf_missing_features.clockid)
|
|
return scnprintf(msg, size, "clockid feature not supported.");
|
|
if (perf_missing_features.clockid_wrong)
|
|
return scnprintf(msg, size, "wrong clockid (%d).", clockid);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return scnprintf(msg, size,
|
|
"The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
|
|
"/bin/dmesg | grep -i perf may provide additional information.\n",
|
|
err, str_error_r(err, sbuf, sizeof(sbuf)),
|
|
perf_evsel__name(evsel));
|
|
}
|
|
|
|
struct perf_env *perf_evsel__env(struct perf_evsel *evsel)
|
|
{
|
|
if (evsel && evsel->evlist)
|
|
return evsel->evlist->env;
|
|
return NULL;
|
|
}
|