linux_dsm_epyc7002/tools/perf/util/evlist.h
Adrian Hunter 9bca1a4ef5 perf record: Add a function to test for kernel support for AUX area sampling
Architectures are expected to know if AUX area sampling is supported by
the hardware. Add a function perf_can_aux_sample() which will determine
whether the kernel supports it.

Committer notes:

I reported that this message was taking place on a kernel without the
required bits:

  # perf record --aux-sample -e '{intel_pt//u,branch-misses:u}'
  Error:
  The sys_perf_event_open() syscall returned with 7 (Argument list too long) for event (branch-misses:u).
  /bin/dmesg | grep -i perf may provide additional information.

Adrian sent a patch addressing it, with this explanation:

 ----
  perf_can_aux_sample_size() always returned true because it did not pass
  the attribute size to sys_perf_event_open, nor correctly check the
  return value and errno.
 ----

After applying it I get, later in the series, when --aux-sample is
added:

  # perf record --aux-sample -e '{intel_pt//u,branch-misses:u}'
  AUX area sampling is not supported by kernel

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20191115124225.5247-4-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2019-11-22 10:43:24 -03:00

353 lines
11 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __PERF_EVLIST_H
#define __PERF_EVLIST_H 1
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/refcount.h>
#include <linux/list.h>
#include <api/fd/array.h>
#include <internal/evlist.h>
#include <internal/evsel.h>
#include "events_stats.h"
#include "evsel.h"
#include <pthread.h>
#include <signal.h>
#include <unistd.h>
struct pollfd;
struct thread_map;
struct perf_cpu_map;
struct record_opts;
/*
* State machine of bkw_mmap_state:
*
* .________________(forbid)_____________.
* | V
* NOTREADY --(0)--> RUNNING --(1)--> DATA_PENDING --(2)--> EMPTY
* ^ ^ | ^ |
* | |__(forbid)____/ |___(forbid)___/|
* | |
* \_________________(3)_______________/
*
* NOTREADY : Backward ring buffers are not ready
* RUNNING : Backward ring buffers are recording
* DATA_PENDING : We are required to collect data from backward ring buffers
* EMPTY : We have collected data from backward ring buffers.
*
* (0): Setup backward ring buffer
* (1): Pause ring buffers for reading
* (2): Read from ring buffers
* (3): Resume ring buffers for recording
*/
enum bkw_mmap_state {
BKW_MMAP_NOTREADY,
BKW_MMAP_RUNNING,
BKW_MMAP_DATA_PENDING,
BKW_MMAP_EMPTY,
};
struct evlist {
struct perf_evlist core;
int nr_groups;
bool enabled;
int id_pos;
int is_pos;
u64 combined_sample_type;
enum bkw_mmap_state bkw_mmap_state;
struct {
int cork_fd;
pid_t pid;
} workload;
struct mmap *mmap;
struct mmap *overwrite_mmap;
struct evsel *selected;
struct events_stats stats;
struct perf_env *env;
void (*trace_event_sample_raw)(struct evlist *evlist,
union perf_event *event,
struct perf_sample *sample);
u64 first_sample_time;
u64 last_sample_time;
struct {
pthread_t th;
volatile int done;
} thread;
};
struct evsel_str_handler {
const char *name;
void *handler;
};
struct evlist *evlist__new(void);
struct evlist *perf_evlist__new_default(void);
struct evlist *perf_evlist__new_dummy(void);
void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
struct perf_thread_map *threads);
void evlist__exit(struct evlist *evlist);
void evlist__delete(struct evlist *evlist);
void evlist__add(struct evlist *evlist, struct evsel *entry);
void evlist__remove(struct evlist *evlist, struct evsel *evsel);
int __perf_evlist__add_default(struct evlist *evlist, bool precise);
static inline int perf_evlist__add_default(struct evlist *evlist)
{
return __perf_evlist__add_default(evlist, true);
}
int __perf_evlist__add_default_attrs(struct evlist *evlist,
struct perf_event_attr *attrs, size_t nr_attrs);
#define perf_evlist__add_default_attrs(evlist, array) \
__perf_evlist__add_default_attrs(evlist, array, ARRAY_SIZE(array))
int perf_evlist__add_dummy(struct evlist *evlist);
int perf_evlist__add_sb_event(struct evlist **evlist,
struct perf_event_attr *attr,
perf_evsel__sb_cb_t cb,
void *data);
int perf_evlist__start_sb_thread(struct evlist *evlist,
struct target *target);
void perf_evlist__stop_sb_thread(struct evlist *evlist);
int perf_evlist__add_newtp(struct evlist *evlist,
const char *sys, const char *name, void *handler);
int __evlist__set_tracepoints_handlers(struct evlist *evlist,
const struct evsel_str_handler *assocs,
size_t nr_assocs);
#define evlist__set_tracepoints_handlers(evlist, array) \
__evlist__set_tracepoints_handlers(evlist, array, ARRAY_SIZE(array))
void __perf_evlist__set_sample_bit(struct evlist *evlist,
enum perf_event_sample_format bit);
void __perf_evlist__reset_sample_bit(struct evlist *evlist,
enum perf_event_sample_format bit);
#define perf_evlist__set_sample_bit(evlist, bit) \
__perf_evlist__set_sample_bit(evlist, PERF_SAMPLE_##bit)
#define perf_evlist__reset_sample_bit(evlist, bit) \
__perf_evlist__reset_sample_bit(evlist, PERF_SAMPLE_##bit)
int perf_evlist__set_tp_filter(struct evlist *evlist, const char *filter);
int perf_evlist__set_tp_filter_pid(struct evlist *evlist, pid_t pid);
int perf_evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids);
int perf_evlist__append_tp_filter(struct evlist *evlist, const char *filter);
int perf_evlist__append_tp_filter_pid(struct evlist *evlist, pid_t pid);
int perf_evlist__append_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids);
struct evsel *
perf_evlist__find_tracepoint_by_id(struct evlist *evlist, int id);
struct evsel *
perf_evlist__find_tracepoint_by_name(struct evlist *evlist,
const char *name);
int evlist__add_pollfd(struct evlist *evlist, int fd);
int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask);
int evlist__poll(struct evlist *evlist, int timeout);
struct evsel *perf_evlist__id2evsel(struct evlist *evlist, u64 id);
struct evsel *perf_evlist__id2evsel_strict(struct evlist *evlist,
u64 id);
struct perf_sample_id *perf_evlist__id2sid(struct evlist *evlist, u64 id);
void perf_evlist__toggle_bkw_mmap(struct evlist *evlist, enum bkw_mmap_state state);
void evlist__mmap_consume(struct evlist *evlist, int idx);
int evlist__open(struct evlist *evlist);
void evlist__close(struct evlist *evlist);
struct callchain_param;
void perf_evlist__set_id_pos(struct evlist *evlist);
bool perf_can_sample_identifier(void);
bool perf_can_record_switch_events(void);
bool perf_can_record_cpu_wide(void);
bool perf_can_aux_sample(void);
void perf_evlist__config(struct evlist *evlist, struct record_opts *opts,
struct callchain_param *callchain);
int record_opts__config(struct record_opts *opts);
int perf_evlist__prepare_workload(struct evlist *evlist,
struct target *target,
const char *argv[], bool pipe_output,
void (*exec_error)(int signo, siginfo_t *info,
void *ucontext));
int perf_evlist__start_workload(struct evlist *evlist);
struct option;
int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str);
int perf_evlist__parse_mmap_pages(const struct option *opt,
const char *str,
int unset);
unsigned long perf_event_mlock_kb_in_pages(void);
int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
unsigned int auxtrace_pages,
bool auxtrace_overwrite, int nr_cblocks,
int affinity, int flush, int comp_level);
int evlist__mmap(struct evlist *evlist, unsigned int pages);
void evlist__munmap(struct evlist *evlist);
size_t evlist__mmap_size(unsigned long pages);
void evlist__disable(struct evlist *evlist);
void evlist__enable(struct evlist *evlist);
void perf_evlist__toggle_enable(struct evlist *evlist);
int perf_evlist__enable_event_idx(struct evlist *evlist,
struct evsel *evsel, int idx);
void perf_evlist__set_selected(struct evlist *evlist,
struct evsel *evsel);
int perf_evlist__create_maps(struct evlist *evlist, struct target *target);
int perf_evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel);
void __perf_evlist__set_leader(struct list_head *list);
void perf_evlist__set_leader(struct evlist *evlist);
u64 __perf_evlist__combined_sample_type(struct evlist *evlist);
u64 perf_evlist__combined_sample_type(struct evlist *evlist);
u64 perf_evlist__combined_branch_type(struct evlist *evlist);
bool perf_evlist__sample_id_all(struct evlist *evlist);
u16 perf_evlist__id_hdr_size(struct evlist *evlist);
int perf_evlist__parse_sample(struct evlist *evlist, union perf_event *event,
struct perf_sample *sample);
int perf_evlist__parse_sample_timestamp(struct evlist *evlist,
union perf_event *event,
u64 *timestamp);
bool perf_evlist__valid_sample_type(struct evlist *evlist);
bool perf_evlist__valid_sample_id_all(struct evlist *evlist);
bool perf_evlist__valid_read_format(struct evlist *evlist);
void perf_evlist__splice_list_tail(struct evlist *evlist,
struct list_head *list);
static inline bool perf_evlist__empty(struct evlist *evlist)
{
return list_empty(&evlist->core.entries);
}
static inline struct evsel *evlist__first(struct evlist *evlist)
{
struct perf_evsel *evsel = perf_evlist__first(&evlist->core);
return container_of(evsel, struct evsel, core);
}
static inline struct evsel *evlist__last(struct evlist *evlist)
{
struct perf_evsel *evsel = perf_evlist__last(&evlist->core);
return container_of(evsel, struct evsel, core);
}
int perf_evlist__strerror_open(struct evlist *evlist, int err, char *buf, size_t size);
int perf_evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size);
bool perf_evlist__can_select_event(struct evlist *evlist, const char *str);
void perf_evlist__to_front(struct evlist *evlist,
struct evsel *move_evsel);
/**
* __evlist__for_each_entry - iterate thru all the evsels
* @list: list_head instance to iterate
* @evsel: struct evsel iterator
*/
#define __evlist__for_each_entry(list, evsel) \
list_for_each_entry(evsel, list, core.node)
/**
* evlist__for_each_entry - iterate thru all the evsels
* @evlist: evlist instance to iterate
* @evsel: struct evsel iterator
*/
#define evlist__for_each_entry(evlist, evsel) \
__evlist__for_each_entry(&(evlist)->core.entries, evsel)
/**
* __evlist__for_each_entry_continue - continue iteration thru all the evsels
* @list: list_head instance to iterate
* @evsel: struct evsel iterator
*/
#define __evlist__for_each_entry_continue(list, evsel) \
list_for_each_entry_continue(evsel, list, core.node)
/**
* evlist__for_each_entry_continue - continue iteration thru all the evsels
* @evlist: evlist instance to iterate
* @evsel: struct evsel iterator
*/
#define evlist__for_each_entry_continue(evlist, evsel) \
__evlist__for_each_entry_continue(&(evlist)->core.entries, evsel)
/**
* __evlist__for_each_entry_reverse - iterate thru all the evsels in reverse order
* @list: list_head instance to iterate
* @evsel: struct evsel iterator
*/
#define __evlist__for_each_entry_reverse(list, evsel) \
list_for_each_entry_reverse(evsel, list, core.node)
/**
* evlist__for_each_entry_reverse - iterate thru all the evsels in reverse order
* @evlist: evlist instance to iterate
* @evsel: struct evsel iterator
*/
#define evlist__for_each_entry_reverse(evlist, evsel) \
__evlist__for_each_entry_reverse(&(evlist)->core.entries, evsel)
/**
* __evlist__for_each_entry_safe - safely iterate thru all the evsels
* @list: list_head instance to iterate
* @tmp: struct evsel temp iterator
* @evsel: struct evsel iterator
*/
#define __evlist__for_each_entry_safe(list, tmp, evsel) \
list_for_each_entry_safe(evsel, tmp, list, core.node)
/**
* evlist__for_each_entry_safe - safely iterate thru all the evsels
* @evlist: evlist instance to iterate
* @evsel: struct evsel iterator
* @tmp: struct evsel temp iterator
*/
#define evlist__for_each_entry_safe(evlist, tmp, evsel) \
__evlist__for_each_entry_safe(&(evlist)->core.entries, tmp, evsel)
void perf_evlist__set_tracking_event(struct evlist *evlist,
struct evsel *tracking_evsel);
struct evsel *
perf_evlist__find_evsel_by_str(struct evlist *evlist, const char *str);
struct evsel *perf_evlist__event2evsel(struct evlist *evlist,
union perf_event *event);
bool perf_evlist__exclude_kernel(struct evlist *evlist);
void perf_evlist__force_leader(struct evlist *evlist);
struct evsel *perf_evlist__reset_weak_group(struct evlist *evlist,
struct evsel *evsel);
#endif /* __PERF_EVLIST_H */