perf parse-events: Remove BPF event support

New features like the BPF --filter support in perf record have made the
BPF event functionality somewhat redundant. As shown by commit
fcb027c1a4f6 ("perf tools: Revert enable indices setting syntax for BPF
map") and commit 14e4b9f4289a ("perf trace: Raw augmented syscalls fix
libbpf 1.0+ compatibility") the BPF event support hasn't been well
maintained and it adds considerable complexity in areas like event
parsing, not least as '/' is a separator for event modifiers as well as
in paths.

This patch removes support in the event parser for BPF events and then
the associated functions are removed. This leads to the removal of whole
source files like bpf-loader.c.  Removing support means that augmented
syscalls in perf trace is broken, this will be fixed in a later commit
adding support using BPF skeletons.

The removal of BPF events causes an unused label warning from flex
generated code, so update build to ignore it:

  ```
  util/parse-events-flex.c:2704:1: error: label ‘find_rule’ defined but not used [-Werror=unused-label]
  2704 | find_rule: /* we branch to this label when backing up */
  ```

Committer notes:

Extracted from a larger patch that was also removing the support for
linking with libllvm and libclang, that were an alternative to using an
external clang execution to compile the .c event source code into BPF
bytecode.

Testing it:

  # perf trace -e /home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.c
  event syntax error: '/home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.c'
                        \___ Bad event or PMU

  Unabled to find PMU or event on a PMU of 'home'

  Initial error:
  event syntax error: '/home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.c'
                        \___ Cannot find PMU `home'. Missing kernel support?
  Run 'perf list' for a list of valid events

   Usage: perf trace [<options>] [<command>]
      or: perf trace [<options>] -- <command> [<options>]
      or: perf trace record [<options>] [<command>]
      or: perf trace record [<options>] -- <command> [<options>]

      -e, --event <event>   event/syscall selector. use 'perf list' to list available events
  #

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Carsten Haitzler <carsten.haitzler@arm.com>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Fangrui Song <maskray@google.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
Cc: Tom Rix <trix@redhat.com>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: Wang ShaoBo <bobo.shaobowang@huawei.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: YueHaibing <yuehaibing@huawei.com>
Cc: bpf@vger.kernel.org
Cc: llvm@lists.linux.dev
Link: https://lore.kernel.org/r/20230810184853.2860737-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 0 insertions, 1999 deletions

diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
deleted file mode 100644
index b54e42f17926..000000000000
--- a/tools/perf/util/bpf-loader.c
+++ /dev/null
@@ -1,1999 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * bpf-loader.c
- *
- * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
- * Copyright (C) 2015 Huawei Inc.
- */
-
-#include <linux/bpf.h>
-#include <bpf/libbpf.h>
-#include <bpf/bpf.h>
-#include <linux/filter.h>
-#include <linux/err.h>
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/zalloc.h>
-#include <errno.h>
-#include <stdlib.h>
-#include "debug.h"
-#include "evlist.h"
-#include "bpf-loader.h"
-#include "bpf-prologue.h"
-#include "probe-event.h"
-#include "probe-finder.h" // for MAX_PROBES
-#include "parse-events.h"
-#include "strfilter.h"
-#include "util.h"
-#include "llvm-utils.h"
-#include "util/hashmap.h"
-#include "asm/bug.h"
-
-#include <internal/xyarray.h>
-
-static int libbpf_perf_print(enum libbpf_print_level level __attribute__((unused)),
-			      const char *fmt, va_list args)
-{
-	return veprintf(1, verbose, pr_fmt(fmt), args);
-}
-
-struct bpf_prog_priv {
-	bool is_tp;
-	char *sys_name;
-	char *evt_name;
-	struct perf_probe_event pev;
-	bool need_prologue;
-	struct bpf_insn *insns_buf;
-	int nr_types;
-	int *type_mapping;
-	int *prologue_fds;
-};
-
-struct bpf_perf_object {
-	struct list_head list;
-	struct bpf_object *obj;
-};
-
-struct bpf_preproc_result {
-	struct bpf_insn *new_insn_ptr;
-	int new_insn_cnt;
-};
-
-static LIST_HEAD(bpf_objects_list);
-static struct hashmap *bpf_program_hash;
-static struct hashmap *bpf_map_hash;
-
-static struct bpf_perf_object *
-bpf_perf_object__next(struct bpf_perf_object *prev)
-{
-	if (!prev) {
-		if (list_empty(&bpf_objects_list))
-			return NULL;
-
-		return list_first_entry(&bpf_objects_list, struct bpf_perf_object, list);
-	}
-	if (list_is_last(&prev->list, &bpf_objects_list))
-		return NULL;
-
-	return list_next_entry(prev, list);
-}
-
-#define bpf_perf_object__for_each(perf_obj, tmp)	\
-	for ((perf_obj) = bpf_perf_object__next(NULL),	\
-	     (tmp) = bpf_perf_object__next(perf_obj);	\
-	     (perf_obj) != NULL;			\
-	     (perf_obj) = (tmp), (tmp) = bpf_perf_object__next(tmp))
-
-static bool libbpf_initialized;
-static int libbpf_sec_handler;
-
-static int bpf_perf_object__add(struct bpf_object *obj)
-{
-	struct bpf_perf_object *perf_obj = zalloc(sizeof(*perf_obj));
-
-	if (perf_obj) {
-		INIT_LIST_HEAD(&perf_obj->list);
-		perf_obj->obj = obj;
-		list_add_tail(&perf_obj->list, &bpf_objects_list);
-	}
-	return perf_obj ? 0 : -ENOMEM;
-}
-
-static void *program_priv(const struct bpf_program *prog)
-{
-	void *priv;
-
-	if (IS_ERR_OR_NULL(bpf_program_hash))
-		return NULL;
-	if (!hashmap__find(bpf_program_hash, prog, &priv))
-		return NULL;
-	return priv;
-}
-
-static struct bpf_insn prologue_init_insn[] = {
-	BPF_MOV64_IMM(BPF_REG_2, 0),
-	BPF_MOV64_IMM(BPF_REG_3, 0),
-	BPF_MOV64_IMM(BPF_REG_4, 0),
-	BPF_MOV64_IMM(BPF_REG_5, 0),
-};
-
-static int libbpf_prog_prepare_load_fn(struct bpf_program *prog,
-				       struct bpf_prog_load_opts *opts __maybe_unused,
-				       long cookie __maybe_unused)
-{
-	size_t init_size_cnt = ARRAY_SIZE(prologue_init_insn);
-	size_t orig_insn_cnt, insn_cnt, init_size, orig_size;
-	struct bpf_prog_priv *priv = program_priv(prog);
-	const struct bpf_insn *orig_insn;
-	struct bpf_insn *insn;
-
-	if (IS_ERR_OR_NULL(priv)) {
-		pr_debug("bpf: failed to get private field\n");
-		return -BPF_LOADER_ERRNO__INTERNAL;
-	}
-
-	if (!priv->need_prologue)
-		return 0;
-
-	/* prepend initialization code to program instructions */
-	orig_insn = bpf_program__insns(prog);
-	orig_insn_cnt = bpf_program__insn_cnt(prog);
-	init_size = init_size_cnt * sizeof(*insn);
-	orig_size = orig_insn_cnt * sizeof(*insn);
-
-	insn_cnt = orig_insn_cnt + init_size_cnt;
-	insn = malloc(insn_cnt * sizeof(*insn));
-	if (!insn)
-		return -ENOMEM;
-
-	memcpy(insn, prologue_init_insn, init_size);
-	memcpy((char *) insn + init_size, orig_insn, orig_size);
-	bpf_program__set_insns(prog, insn, insn_cnt);
-	return 0;
-}
-
-static int libbpf_init(void)
-{
-	LIBBPF_OPTS(libbpf_prog_handler_opts, handler_opts,
-		.prog_prepare_load_fn = libbpf_prog_prepare_load_fn,
-	);
-
-	if (libbpf_initialized)
-		return 0;
-
-	libbpf_set_print(libbpf_perf_print);
-	libbpf_sec_handler = libbpf_register_prog_handler(NULL, BPF_PROG_TYPE_KPROBE,
-							  0, &handler_opts);
-	if (libbpf_sec_handler < 0) {
-		pr_debug("bpf: failed to register libbpf section handler: %d\n",
-			 libbpf_sec_handler);
-		return -BPF_LOADER_ERRNO__INTERNAL;
-	}
-	libbpf_initialized = true;
-	return 0;
-}
-
-struct bpf_object *
-bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
-{
-	LIBBPF_OPTS(bpf_object_open_opts, opts, .object_name = name);
-	struct bpf_object *obj;
-	int err;
-
-	err = libbpf_init();
-	if (err)
-		return ERR_PTR(err);
-
-	obj = bpf_object__open_mem(obj_buf, obj_buf_sz, &opts);
-	if (IS_ERR_OR_NULL(obj)) {
-		pr_debug("bpf: failed to load buffer\n");
-		return ERR_PTR(-EINVAL);
-	}
-
-	if (bpf_perf_object__add(obj)) {
-		bpf_object__close(obj);
-		return ERR_PTR(-ENOMEM);
-	}
-
-	return obj;
-}
-
-static void bpf_perf_object__close(struct bpf_perf_object *perf_obj)
-{
-	list_del(&perf_obj->list);
-	bpf_object__close(perf_obj->obj);
-	free(perf_obj);
-}
-
-struct bpf_object *bpf__prepare_load(const char *filename, bool source)
-{
-	LIBBPF_OPTS(bpf_object_open_opts, opts, .object_name = filename);
-	struct bpf_object *obj;
-	int err;
-
-	err = libbpf_init();
-	if (err)
-		return ERR_PTR(err);
-
-	if (source) {
-		void *obj_buf;
-		size_t obj_buf_sz;
-
-		err = llvm__compile_bpf(filename, &obj_buf, &obj_buf_sz);
-		if (err)
-			return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
-
-		obj = bpf_object__open_mem(obj_buf, obj_buf_sz, &opts);
-
-		if (!IS_ERR_OR_NULL(obj) && llvm_param.dump_obj)
-			llvm__dump_obj(filename, obj_buf, obj_buf_sz);
-
-		free(obj_buf);
-	} else {
-		obj = bpf_object__open(filename);
-	}
-
-	if (IS_ERR_OR_NULL(obj)) {
-		pr_debug("bpf: failed to load %s\n", filename);
-		return obj;
-	}
-
-	if (bpf_perf_object__add(obj)) {
-		bpf_object__close(obj);
-		return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
-	}
-
-	return obj;
-}
-
-static void close_prologue_programs(struct bpf_prog_priv *priv)
-{
-	struct perf_probe_event *pev;
-	int i, fd;
-
-	if (!priv->need_prologue)
-		return;
-	pev = &priv->pev;
-	for (i = 0; i < pev->ntevs; i++) {
-		fd = priv->prologue_fds[i];
-		if (fd != -1)
-			close(fd);
-	}
-}
-
-static void
-clear_prog_priv(const struct bpf_program *prog __maybe_unused,
-		void *_priv)
-{
-	struct bpf_prog_priv *priv = _priv;
-
-	close_prologue_programs(priv);
-	cleanup_perf_probe_events(&priv->pev, 1);
-	zfree(&priv->insns_buf);
-	zfree(&priv->prologue_fds);
-	zfree(&priv->type_mapping);
-	zfree(&priv->sys_name);
-	zfree(&priv->evt_name);
-	free(priv);
-}
-
-static void bpf_program_hash_free(void)
-{
-	struct hashmap_entry *cur;
-	size_t bkt;
-
-	if (IS_ERR_OR_NULL(bpf_program_hash))
-		return;
-
-	hashmap__for_each_entry(bpf_program_hash, cur, bkt)
-		clear_prog_priv(cur->pkey, cur->pvalue);
-
-	hashmap__free(bpf_program_hash);
-	bpf_program_hash = NULL;
-}
-
-static void bpf_map_hash_free(void);
-
-void bpf__clear(void)
-{
-	struct bpf_perf_object *perf_obj, *tmp;
-
-	bpf_perf_object__for_each(perf_obj, tmp) {
-		bpf__unprobe(perf_obj->obj);
-		bpf_perf_object__close(perf_obj);
-	}
-
-	bpf_program_hash_free();
-	bpf_map_hash_free();
-}
-
-static size_t ptr_hash(const long __key, void *ctx __maybe_unused)
-{
-	return __key;
-}
-
-static bool ptr_equal(long key1, long key2, void *ctx __maybe_unused)
-{
-	return key1 == key2;
-}
-
-static int program_set_priv(struct bpf_program *prog, void *priv)
-{
-	void *old_priv;
-
-	/*
-	 * Should not happen, we warn about it in the
-	 * caller function - config_bpf_program
-	 */
-	if (IS_ERR(bpf_program_hash))
-		return PTR_ERR(bpf_program_hash);
-
-	if (!bpf_program_hash) {
-		bpf_program_hash = hashmap__new(ptr_hash, ptr_equal, NULL);
-		if (IS_ERR(bpf_program_hash))
-			return PTR_ERR(bpf_program_hash);
-	}
-
-	old_priv = program_priv(prog);
-	if (old_priv) {
-		clear_prog_priv(prog, old_priv);
-		return hashmap__set(bpf_program_hash, prog, priv, NULL, NULL);
-	}
-	return hashmap__add(bpf_program_hash, prog, priv);
-}
-
-static int
-prog_config__exec(const char *value, struct perf_probe_event *pev)
-{
-	pev->uprobes = true;
-	pev->target = strdup(value);
-	if (!pev->target)
-		return -ENOMEM;
-	return 0;
-}
-
-static int
-prog_config__module(const char *value, struct perf_probe_event *pev)
-{
-	pev->uprobes = false;
-	pev->target = strdup(value);
-	if (!pev->target)
-		return -ENOMEM;
-	return 0;
-}
-
-static int
-prog_config__bool(const char *value, bool *pbool, bool invert)
-{
-	int err;
-	bool bool_value;
-
-	if (!pbool)
-		return -EINVAL;
-
-	err = strtobool(value, &bool_value);
-	if (err)
-		return err;
-
-	*pbool = invert ? !bool_value : bool_value;
-	return 0;
-}
-
-static int
-prog_config__inlines(const char *value,
-		     struct perf_probe_event *pev __maybe_unused)
-{
-	return prog_config__bool(value, &probe_conf.no_inlines, true);
-}
-
-static int
-prog_config__force(const char *value,
-		   struct perf_probe_event *pev __maybe_unused)
-{
-	return prog_config__bool(value, &probe_conf.force_add, false);
-}
-
-static struct {
-	const char *key;
-	const char *usage;
-	const char *desc;
-	int (*func)(const char *, struct perf_probe_event *);
-} bpf_prog_config_terms[] = {
-	{
-		.key	= "exec",
-		.usage	= "exec=<full path of file>",
-		.desc	= "Set uprobe target",
-		.func	= prog_config__exec,
-	},
-	{
-		.key	= "module",
-		.usage	= "module=<module name>    ",
-		.desc	= "Set kprobe module",
-		.func	= prog_config__module,
-	},
-	{
-		.key	= "inlines",
-		.usage	= "inlines=[yes|no]        ",
-		.desc	= "Probe at inline symbol",
-		.func	= prog_config__inlines,
-	},
-	{
-		.key	= "force",
-		.usage	= "force=[yes|no]          ",
-		.desc	= "Forcibly add events with existing name",
-		.func	= prog_config__force,
-	},
-};
-
-static int
-do_prog_config(const char *key, const char *value,
-	       struct perf_probe_event *pev)
-{
-	unsigned int i;
-
-	pr_debug("config bpf program: %s=%s\n", key, value);
-	for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
-		if (strcmp(key, bpf_prog_config_terms[i].key) == 0)
-			return bpf_prog_config_terms[i].func(value, pev);
-
-	pr_debug("BPF: ERROR: invalid program config option: %s=%s\n",
-		 key, value);
-
-	pr_debug("\nHint: Valid options are:\n");
-	for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
-		pr_debug("\t%s:\t%s\n", bpf_prog_config_terms[i].usage,
-			 bpf_prog_config_terms[i].desc);
-	pr_debug("\n");
-
-	return -BPF_LOADER_ERRNO__PROGCONF_TERM;
-}
-
-static const char *
-parse_prog_config_kvpair(const char *config_str, struct perf_probe_event *pev)
-{
-	char *text = strdup(config_str);
-	char *sep, *line;
-	const char *main_str = NULL;
-	int err = 0;
-
-	if (!text) {
-		pr_debug("Not enough memory: dup config_str failed\n");
-		return ERR_PTR(-ENOMEM);
-	}
-
-	line = text;
-	while ((sep = strchr(line, ';'))) {
-		char *equ;
-
-		*sep = '\0';
-		equ = strchr(line, '=');
-		if (!equ) {
-			pr_warning("WARNING: invalid config in BPF object: %s\n",
-				   line);
-			pr_warning("\tShould be 'key=value'.\n");
-			goto nextline;
-		}
-		*equ = '\0';
-
-		err = do_prog_config(line, equ + 1, pev);
-		if (err)
-			break;
-nextline:
-		line = sep + 1;
-	}
-
-	if (!err)
-		main_str = config_str + (line - text);
-	free(text);
-
-	return err ? ERR_PTR(err) : main_str;
-}
-
-static int
-parse_prog_config(const char *config_str, const char **p_main_str,
-		  bool *is_tp, struct perf_probe_event *pev)
-{
-	int err;
-	const char *main_str = parse_prog_config_kvpair(config_str, pev);
-
-	if (IS_ERR(main_str))
-		return PTR_ERR(main_str);
-
-	*p_main_str = main_str;
-	if (!strchr(main_str, '=')) {
-		/* Is a tracepoint event? */
-		const char *s = strchr(main_str, ':');
-
-		if (!s) {
-			pr_debug("bpf: '%s' is not a valid tracepoint\n",
-				 config_str);
-			return -BPF_LOADER_ERRNO__CONFIG;
-		}
-
-		*is_tp = true;
-		return 0;
-	}
-
-	*is_tp = false;
-	err = parse_perf_probe_command(main_str, pev);
-	if (err < 0) {
-		pr_debug("bpf: '%s' is not a valid config string\n",
-			 config_str);
-		/* parse failed, don't need clear pev. */
-		return -BPF_LOADER_ERRNO__CONFIG;
-	}
-	return 0;
-}
-
-static int
-config_bpf_program(struct bpf_program *prog)
-{
-	struct perf_probe_event *pev = NULL;
-	struct bpf_prog_priv *priv = NULL;
-	const char *config_str, *main_str;
-	bool is_tp = false;
-	int err;
-
-	/* Initialize per-program probing setting */
-	probe_conf.no_inlines = false;
-	probe_conf.force_add = false;
-
-	priv = calloc(sizeof(*priv), 1);
-	if (!priv) {
-		pr_debug("bpf: failed to alloc priv\n");
-		return -ENOMEM;
-	}
-	pev = &priv->pev;
-
-	config_str = bpf_program__section_name(prog);
-	pr_debug("bpf: config program '%s'\n", config_str);
-	err = parse_prog_config(config_str, &main_str, &is_tp, pev);
-	if (err)
-		goto errout;
-
-	if (is_tp) {
-		char *s = strchr(main_str, ':');
-
-		priv->is_tp = true;
-		priv->sys_name = strndup(main_str, s - main_str);
-		priv->evt_name = strdup(s + 1);
-		goto set_priv;
-	}
-
-	if (pev->group && strcmp(pev->group, PERF_BPF_PROBE_GROUP)) {
-		pr_debug("bpf: '%s': group for event is set and not '%s'.\n",
-			 config_str, PERF_BPF_PROBE_GROUP);
-		err = -BPF_LOADER_ERRNO__GROUP;
-		goto errout;
-	} else if (!pev->group)
-		pev->group = strdup(PERF_BPF_PROBE_GROUP);
-
-	if (!pev->group) {
-		pr_debug("bpf: strdup failed\n");
-		err = -ENOMEM;
-		goto errout;
-	}
-
-	if (!pev->event) {
-		pr_debug("bpf: '%s': event name is missing. Section name should be 'key=value'\n",
-			 config_str);
-		err = -BPF_LOADER_ERRNO__EVENTNAME;
-		goto errout;
-	}
-	pr_debug("bpf: config '%s' is ok\n", config_str);
-
-set_priv:
-	err = program_set_priv(prog, priv);
-	if (err) {
-		pr_debug("Failed to set priv for program '%s'\n", config_str);
-		goto errout;
-	}
-
-	return 0;
-
-errout:
-	if (pev)
-		clear_perf_probe_event(pev);
-	free(priv);
-	return err;
-}
-
-static int bpf__prepare_probe(void)
-{
-	static int err = 0;
-	static bool initialized = false;
-
-	/*
-	 * Make err static, so if init failed the first, bpf__prepare_probe()
-	 * fails each time without calling init_probe_symbol_maps multiple
-	 * times.
-	 */
-	if (initialized)
-		return err;
-
-	initialized = true;
-	err = init_probe_symbol_maps(false);
-	if (err < 0)
-		pr_debug("Failed to init_probe_symbol_maps\n");
-	probe_conf.max_probes = MAX_PROBES;
-	return err;
-}
-
-static int
-preproc_gen_prologue(struct bpf_program *prog, int n,
-		     const struct bpf_insn *orig_insns, int orig_insns_cnt,
-		     struct bpf_preproc_result *res)
-{
-	struct bpf_prog_priv *priv = program_priv(prog);
-	struct probe_trace_event *tev;
-	struct perf_probe_event *pev;
-	struct bpf_insn *buf;
-	size_t prologue_cnt = 0;
-	int i, err;
-
-	if (IS_ERR_OR_NULL(priv) || priv->is_tp)
-		goto errout;
-
-	pev = &priv->pev;
-
-	if (n < 0 || n >= priv->nr_types)
-		goto errout;
-
-	/* Find a tev belongs to that type */
-	for (i = 0; i < pev->ntevs; i++) {
-		if (priv->type_mapping[i] == n)
-			break;
-	}
-
-	if (i >= pev->ntevs) {
-		pr_debug("Internal error: prologue type %d not found\n", n);
-		return -BPF_LOADER_ERRNO__PROLOGUE;
-	}
-
-	tev = &pev->tevs[i];
-
-	buf = priv->insns_buf;
-	err = bpf__gen_prologue(tev->args, tev->nargs,
-				buf, &prologue_cnt,
-				BPF_MAXINSNS - orig_insns_cnt);
-	if (err) {
-		const char *title;
-
-		title = bpf_program__section_name(prog);
-		pr_debug("Failed to generate prologue for program %s\n",
-			 title);
-		return err;
-	}
-
-	memcpy(&buf[prologue_cnt], orig_insns,
-	       sizeof(struct bpf_insn) * orig_insns_cnt);
-
-	res->new_insn_ptr = buf;
-	res->new_insn_cnt = prologue_cnt + orig_insns_cnt;
-	return 0;
-
-errout:
-	pr_debug("Internal error in preproc_gen_prologue\n");
-	return -BPF_LOADER_ERRNO__PROLOGUE;
-}
-
-/*
- * compare_tev_args is reflexive, transitive and antisymmetric.
- * I can proof it but this margin is too narrow to contain.
- */
-static int compare_tev_args(const void *ptev1, const void *ptev2)
-{
-	int i, ret;
-	const struct probe_trace_event *tev1 =
-		*(const struct probe_trace_event **)ptev1;
-	const struct probe_trace_event *tev2 =
-		*(const struct probe_trace_event **)ptev2;
-
-	ret = tev2->nargs - tev1->nargs;
-	if (ret)
-		return ret;
-
-	for (i = 0; i < tev1->nargs; i++) {
-		struct probe_trace_arg *arg1, *arg2;
-		struct probe_trace_arg_ref *ref1, *ref2;
-
-		arg1 = &tev1->args[i];
-		arg2 = &tev2->args[i];
-
-		ret = strcmp(arg1->value, arg2->value);
-		if (ret)
-			return ret;
-
-		ref1 = arg1->ref;
-		ref2 = arg2->ref;
-
-		while (ref1 && ref2) {
-			ret = ref2->offset - ref1->offset;
-			if (ret)
-				return ret;
-
-			ref1 = ref1->next;
-			ref2 = ref2->next;
-		}
-
-		if (ref1 || ref2)
-			return ref2 ? 1 : -1;
-	}
-
-	return 0;
-}
-
-/*
- * Assign a type number to each tevs in a pev.
- * mapping is an array with same slots as tevs in that pev.
- * nr_types will be set to number of types.
- */
-static int map_prologue(struct perf_probe_event *pev, int *mapping,
-			int *nr_types)
-{
-	int i, type = 0;
-	struct probe_trace_event **ptevs;
-
-	size_t array_sz = sizeof(*ptevs) * pev->ntevs;
-
-	ptevs = malloc(array_sz);
-	if (!ptevs) {
-		pr_debug("Not enough memory: alloc ptevs failed\n");
-		return -ENOMEM;
-	}
-
-	pr_debug("In map_prologue, ntevs=%d\n", pev->ntevs);
-	for (i = 0; i < pev->ntevs; i++)
-		ptevs[i] = &pev->tevs[i];
-
-	qsort(ptevs, pev->ntevs, sizeof(*ptevs),
-	      compare_tev_args);
-
-	for (i = 0; i < pev->ntevs; i++) {
-		int n;
-
-		n = ptevs[i] - pev->tevs;
-		if (i == 0) {
-			mapping[n] = type;
-			pr_debug("mapping[%d]=%d\n", n, type);
-			continue;
-		}
-
-		if (compare_tev_args(ptevs + i, ptevs + i - 1) == 0)
-			mapping[n] = type;
-		else
-			mapping[n] = ++type;
-
-		pr_debug("mapping[%d]=%d\n", n, mapping[n]);
-	}
-	free(ptevs);
-	*nr_types = type + 1;
-
-	return 0;
-}
-
-static int hook_load_preprocessor(struct bpf_program *prog)
-{
-	struct bpf_prog_priv *priv = program_priv(prog);
-	struct perf_probe_event *pev;
-	bool need_prologue = false;
-	int i;
-
-	if (IS_ERR_OR_NULL(priv)) {
-		pr_debug("Internal error when hook preprocessor\n");
-		return -BPF_LOADER_ERRNO__INTERNAL;
-	}
-
-	if (priv->is_tp) {
-		priv->need_prologue = false;
-		return 0;
-	}
-
-	pev = &priv->pev;
-	for (i = 0; i < pev->ntevs; i++) {
-		struct probe_trace_event *tev = &pev->tevs[i];
-
-		if (tev->nargs > 0) {
-			need_prologue = true;
-			break;
-		}
-	}
-
-	/*
-	 * Since all tevs don't have argument, we don't need generate
-	 * prologue.
-	 */
-	if (!need_prologue) {
-		priv->need_prologue = false;
-		return 0;
-	}
-
-	priv->need_prologue = true;
-	priv->insns_buf = malloc(sizeof(struct bpf_insn) * BPF_MAXINSNS);
-	if (!priv->insns_buf) {
-		pr_debug("Not enough memory: alloc insns_buf failed\n");
-		return -ENOMEM;
-	}
-
-	priv->prologue_fds = malloc(sizeof(int) * pev->ntevs);
-	if (!priv->prologue_fds) {
-		pr_debug("Not enough memory: alloc prologue fds failed\n");
-		return -ENOMEM;
-	}
-	memset(priv->prologue_fds, -1, sizeof(int) * pev->ntevs);
-
-	priv->type_mapping = malloc(sizeof(int) * pev->ntevs);
-	if (!priv->type_mapping) {
-		pr_debug("Not enough memory: alloc type_mapping failed\n");
-		return -ENOMEM;
-	}
-	memset(priv->type_mapping, -1,
-	       sizeof(int) * pev->ntevs);
-
-	return map_prologue(pev, priv->type_mapping, &priv->nr_types);
-}
-
-int bpf__probe(struct bpf_object *obj)
-{
-	int err = 0;
-	struct bpf_program *prog;
-	struct bpf_prog_priv *priv;
-	struct perf_probe_event *pev;
-
-	err = bpf__prepare_probe();
-	if (err) {
-		pr_debug("bpf__prepare_probe failed\n");
-		return err;
-	}
-
-	bpf_object__for_each_program(prog, obj) {
-		err = config_bpf_program(prog);
-		if (err)
-			goto out;
-
-		priv = program_priv(prog);
-		if (IS_ERR_OR_NULL(priv)) {
-			if (!priv)
-				err = -BPF_LOADER_ERRNO__INTERNAL;
-			else
-				err = PTR_ERR(priv);
-			goto out;
-		}
-
-		if (priv->is_tp) {
-			bpf_program__set_type(prog, BPF_PROG_TYPE_TRACEPOINT);
-			continue;
-		}
-
-		bpf_program__set_type(prog, BPF_PROG_TYPE_KPROBE);
-		pev = &priv->pev;
-
-		err = convert_perf_probe_events(pev, 1);
-		if (err < 0) {
-			pr_debug("bpf_probe: failed to convert perf probe events\n");
-			goto out;
-		}
-
-		err = apply_perf_probe_events(pev, 1);
-		if (err < 0) {
-			pr_debug("bpf_probe: failed to apply perf probe events\n");
-			goto out;
-		}
-
-		/*
-		 * After probing, let's consider prologue, which
-		 * adds program fetcher to BPF programs.
-		 *
-		 * hook_load_preprocessor() hooks pre-processor
-		 * to bpf_program, let it generate prologue
-		 * dynamically during loading.
-		 */
-		err = hook_load_preprocessor(prog);
-		if (err)
-			goto out;
-	}
-out:
-	return err < 0 ? err : 0;
-}
-
-#define EVENTS_WRITE_BUFSIZE  4096
-int bpf__unprobe(struct bpf_object *obj)
-{
-	int err, ret = 0;
-	struct bpf_program *prog;
-
-	bpf_object__for_each_program(prog, obj) {
-		struct bpf_prog_priv *priv = program_priv(prog);
-		int i;
-
-		if (IS_ERR_OR_NULL(priv) || priv->is_tp)
-			continue;
-
-		for (i = 0; i < priv->pev.ntevs; i++) {
-			struct probe_trace_event *tev = &priv->pev.tevs[i];
-			char name_buf[EVENTS_WRITE_BUFSIZE];
-			struct strfilter *delfilter;
-
-			snprintf(name_buf, EVENTS_WRITE_BUFSIZE,
-				 "%s:%s", tev->group, tev->event);
-			name_buf[EVENTS_WRITE_BUFSIZE - 1] = '\0';
-
-			delfilter = strfilter__new(name_buf, NULL);
-			if (!delfilter) {
-				pr_debug("Failed to create filter for unprobing\n");
-				ret = -ENOMEM;
-				continue;
-			}
-
-			err = del_perf_probe_events(delfilter);
-			strfilter__delete(delfilter);
-			if (err) {
-				pr_debug("Failed to delete %s\n", name_buf);
-				ret = err;
-				continue;
-			}
-		}
-	}
-	return ret;
-}
-
-static int bpf_object__load_prologue(struct bpf_object *obj)
-{
-	int init_cnt = ARRAY_SIZE(prologue_init_insn);
-	const struct bpf_insn *orig_insns;
-	struct bpf_preproc_result res;
-	struct perf_probe_event *pev;
-	struct bpf_program *prog;
-	int orig_insns_cnt;
-
-	bpf_object__for_each_program(prog, obj) {
-		struct bpf_prog_priv *priv = program_priv(prog);
-		int err, i, fd;
-
-		if (IS_ERR_OR_NULL(priv)) {
-			pr_debug("bpf: failed to get private field\n");
-			return -BPF_LOADER_ERRNO__INTERNAL;
-		}
-
-		if (!priv->need_prologue)
-			continue;
-
-		/*
-		 * For each program that needs prologue we do following:
-		 *
-		 * - take its current instructions and use them
-		 *   to generate the new code with prologue
-		 * - load new instructions with bpf_prog_load
-		 *   and keep the fd in prologue_fds
-		 * - new fd will be used in bpf__foreach_event
-		 *   to connect this program with perf evsel
-		 */
-		orig_insns = bpf_program__insns(prog);
-		orig_insns_cnt = bpf_program__insn_cnt(prog);
-
-		pev = &priv->pev;
-		for (i = 0; i < pev->ntevs; i++) {
-			/*
-			 * Skipping artificall prologue_init_insn instructions
-			 * (init_cnt), so the prologue can be generated instead
-			 * of them.
-			 */
-			err = preproc_gen_prologue(prog, i,
-						   orig_insns + init_cnt,
-						   orig_insns_cnt - init_cnt,
-						   &res);
-			if (err)
-				return err;
-
-			fd = bpf_prog_load(bpf_program__get_type(prog),
-					   bpf_program__name(prog), "GPL",
-					   res.new_insn_ptr,
-					   res.new_insn_cnt, NULL);
-			if (fd < 0) {
-				char bf[128];
-
-				libbpf_strerror(-errno, bf, sizeof(bf));
-				pr_debug("bpf: load objects with prologue failed: err=%d: (%s)\n",
-					 -errno, bf);
-				return -errno;
-			}
-			priv->prologue_fds[i] = fd;
-		}
-		/*
-		 * We no longer need the original program,
-		 * we can unload it.
-		 */
-		bpf_program__unload(prog);
-	}
-	return 0;
-}
-
-int bpf__load(struct bpf_object *obj)
-{
-	int err;
-
-	err = bpf_object__load(obj);
-	if (err) {
-		char bf[128];
-		libbpf_strerror(err, bf, sizeof(bf));
-		pr_debug("bpf: load objects failed: err=%d: (%s)\n", err, bf);
-		return err;
-	}
-	return bpf_object__load_prologue(obj);
-}
-
-int bpf__foreach_event(struct bpf_object *obj,
-		       bpf_prog_iter_callback_t func,
-		       void *arg)
-{
-	struct bpf_program *prog;
-	int err;
-
-	bpf_object__for_each_program(prog, obj) {
-		struct bpf_prog_priv *priv = program_priv(prog);
-		struct probe_trace_event *tev;
-		struct perf_probe_event *pev;
-		int i, fd;
-
-		if (IS_ERR_OR_NULL(priv)) {
-			pr_debug("bpf: failed to get private field\n");
-			return -BPF_LOADER_ERRNO__INTERNAL;
-		}
-
-		if (priv->is_tp) {
-			fd = bpf_program__fd(prog);
-			err = (*func)(priv->sys_name, priv->evt_name, fd, obj, arg);
-			if (err) {
-				pr_debug("bpf: tracepoint call back failed, stop iterate\n");
-				return err;
-			}
-			continue;
-		}
-
-		pev = &priv->pev;
-		for (i = 0; i < pev->ntevs; i++) {
-			tev = &pev->tevs[i];
-
-			if (priv->need_prologue)
-				fd = priv->prologue_fds[i];
-			else
-				fd = bpf_program__fd(prog);
-
-			if (fd < 0) {
-				pr_debug("bpf: failed to get file descriptor\n");
-				return fd;
-			}
-
-			err = (*func)(tev->group, tev->event, fd, obj, arg);
-			if (err) {
-				pr_debug("bpf: call back failed, stop iterate\n");
-				return err;
-			}
-		}
-	}
-	return 0;
-}
-
-enum bpf_map_op_type {
-	BPF_MAP_OP_SET_VALUE,
-	BPF_MAP_OP_SET_EVSEL,
-};
-
-enum bpf_map_key_type {
-	BPF_MAP_KEY_ALL,
-};
-
-struct bpf_map_op {
-	struct list_head list;
-	enum bpf_map_op_type op_type;
-	enum bpf_map_key_type key_type;
-	union {
-		u64 value;
-		struct evsel *evsel;
-	} v;
-};
-
-struct bpf_map_priv {
-	struct list_head ops_list;
-};
-
-static void
-bpf_map_op__delete(struct bpf_map_op *op)
-{
-	if (!list_empty(&op->list))
-		list_del_init(&op->list);
-	free(op);
-}
-
-static void
-bpf_map_priv__purge(struct bpf_map_priv *priv)
-{
-	struct bpf_map_op *pos, *n;
-
-	list_for_each_entry_safe(pos, n, &priv->ops_list, list) {
-		list_del_init(&pos->list);
-		bpf_map_op__delete(pos);
-	}
-}
-
-static void
-bpf_map_priv__clear(const struct bpf_map *map __maybe_unused,
-		    void *_priv)
-{
-	struct bpf_map_priv *priv = _priv;
-
-	bpf_map_priv__purge(priv);
-	free(priv);
-}
-
-static void *map_priv(const struct bpf_map *map)
-{
-	void *priv;
-
-	if (IS_ERR_OR_NULL(bpf_map_hash))
-		return NULL;
-	if (!hashmap__find(bpf_map_hash, map, &priv))
-		return NULL;
-	return priv;
-}
-
-static void bpf_map_hash_free(void)
-{
-	struct hashmap_entry *cur;
-	size_t bkt;
-
-	if (IS_ERR_OR_NULL(bpf_map_hash))
-		return;
-
-	hashmap__for_each_entry(bpf_map_hash, cur, bkt)
-		bpf_map_priv__clear(cur->pkey, cur->pvalue);
-
-	hashmap__free(bpf_map_hash);
-	bpf_map_hash = NULL;
-}
-
-static int map_set_priv(struct bpf_map *map, void *priv)
-{
-	void *old_priv;
-
-	if (WARN_ON_ONCE(IS_ERR(bpf_map_hash)))
-		return PTR_ERR(bpf_program_hash);
-
-	if (!bpf_map_hash) {
-		bpf_map_hash = hashmap__new(ptr_hash, ptr_equal, NULL);
-		if (IS_ERR(bpf_map_hash))
-			return PTR_ERR(bpf_map_hash);
-	}
-
-	old_priv = map_priv(map);
-	if (old_priv) {
-		bpf_map_priv__clear(map, old_priv);
-		return hashmap__set(bpf_map_hash, map, priv, NULL, NULL);
-	}
-	return hashmap__add(bpf_map_hash, map, priv);
-}
-
-static int
-bpf_map_op_setkey(struct bpf_map_op *op, struct parse_events_term *term)
-{
-	op->key_type = BPF_MAP_KEY_ALL;
-	if (!term)
-		return 0;
-
-	return 0;
-}
-
-static struct bpf_map_op *
-bpf_map_op__new(struct parse_events_term *term)
-{
-	struct bpf_map_op *op;
-	int err;
-
-	op = zalloc(sizeof(*op));
-	if (!op) {
-		pr_debug("Failed to alloc bpf_map_op\n");
-		return ERR_PTR(-ENOMEM);
-	}
-	INIT_LIST_HEAD(&op->list);
-
-	err = bpf_map_op_setkey(op, term);
-	if (err) {
-		free(op);
-		return ERR_PTR(err);
-	}
-	return op;
-}
-
-static struct bpf_map_op *
-bpf_map_op__clone(struct bpf_map_op *op)
-{
-	struct bpf_map_op *newop;
-
-	newop = memdup(op, sizeof(*op));
-	if (!newop) {
-		pr_debug("Failed to alloc bpf_map_op\n");
-		return NULL;
-	}
-
-	INIT_LIST_HEAD(&newop->list);
-	return newop;
-}
-
-static struct bpf_map_priv *
-bpf_map_priv__clone(struct bpf_map_priv *priv)
-{
-	struct bpf_map_priv *newpriv;
-	struct bpf_map_op *pos, *newop;
-
-	newpriv = zalloc(sizeof(*newpriv));
-	if (!newpriv) {
-		pr_debug("Not enough memory to alloc map private\n");
-		return NULL;
-	}
-	INIT_LIST_HEAD(&newpriv->ops_list);
-
-	list_for_each_entry(pos, &priv->ops_list, list) {
-		newop = bpf_map_op__clone(pos);
-		if (!newop) {
-			bpf_map_priv__purge(newpriv);
-			return NULL;
-		}
-		list_add_tail(&newop->list, &newpriv->ops_list);
-	}
-
-	return newpriv;
-}
-
-static int
-bpf_map__add_op(struct bpf_map *map, struct bpf_map_op *op)
-{
-	const char *map_name = bpf_map__name(map);
-	struct bpf_map_priv *priv = map_priv(map);
-
-	if (IS_ERR(priv)) {
-		pr_debug("Failed to get private from map %s\n", map_name);
-		return PTR_ERR(priv);
-	}
-
-	if (!priv) {
-		priv = zalloc(sizeof(*priv));
-		if (!priv) {
-			pr_debug("Not enough memory to alloc map private\n");
-			return -ENOMEM;
-		}
-		INIT_LIST_HEAD(&priv->ops_list);
-
-		if (map_set_priv(map, priv)) {
-			free(priv);
-			return -BPF_LOADER_ERRNO__INTERNAL;
-		}
-	}
-
-	list_add_tail(&op->list, &priv->ops_list);
-	return 0;
-}
-
-static struct bpf_map_op *
-bpf_map__add_newop(struct bpf_map *map, struct parse_events_term *term)
-{
-	struct bpf_map_op *op;
-	int err;
-
-	op = bpf_map_op__new(term);
-	if (IS_ERR(op))
-		return op;
-
-	err = bpf_map__add_op(map, op);
-	if (err) {
-		bpf_map_op__delete(op);
-		return ERR_PTR(err);
-	}
-	return op;
-}
-
-static int
-__bpf_map__config_value(struct bpf_map *map,
-			struct parse_events_term *term)
-{
-	struct bpf_map_op *op;
-	const char *map_name = bpf_map__name(map);
-
-	if (!map) {
-		pr_debug("Map '%s' is invalid\n", map_name);
-		return -BPF_LOADER_ERRNO__INTERNAL;
-	}
-
-	if (bpf_map__type(map) != BPF_MAP_TYPE_ARRAY) {
-		pr_debug("Map %s type is not BPF_MAP_TYPE_ARRAY\n",
-			 map_name);
-		return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
-	}
-	if (bpf_map__key_size(map) < sizeof(unsigned int)) {
-		pr_debug("Map %s has incorrect key size\n", map_name);
-		return -BPF_LOADER_ERRNO__OBJCONF_MAP_KEYSIZE;
-	}
-	switch (bpf_map__value_size(map)) {
-	case 1:
-	case 2:
-	case 4:
-	case 8:
-		break;
-	default:
-		pr_debug("Map %s has incorrect value size\n", map_name);
-		return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
-	}
-
-	op = bpf_map__add_newop(map, term);
-	if (IS_ERR(op))
-		return PTR_ERR(op);
-	op->op_type = BPF_MAP_OP_SET_VALUE;
-	op->v.value = term->val.num;
-	return 0;
-}
-
-static int
-bpf_map__config_value(struct bpf_map *map,
-		      struct parse_events_term *term,
-		      struct evlist *evlist __maybe_unused)
-{
-	if (!term->err_val) {
-		pr_debug("Config value not set\n");
-		return -BPF_LOADER_ERRNO__OBJCONF_CONF;
-	}
-
-	if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM) {
-		pr_debug("ERROR: wrong value type for 'value'\n");
-		return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
-	}
-
-	return __bpf_map__config_value(map, term);
-}
-
-static int
-__bpf_map__config_event(struct bpf_map *map,
-			struct parse_events_term *term,
-			struct evlist *evlist)
-{
-	struct bpf_map_op *op;
-	const char *map_name = bpf_map__name(map);
-	struct evsel *evsel = evlist__find_evsel_by_str(evlist, term->val.str);
-
-	if (!evsel) {
-		pr_debug("Event (for '%s') '%s' doesn't exist\n",
-			 map_name, term->val.str);
-		return -BPF_LOADER_ERRNO__OBJCONF_MAP_NOEVT;
-	}
-
-	if (!map) {
-		pr_debug("Map '%s' is invalid\n", map_name);
-		return PTR_ERR(map);
-	}
-
-	/*
-	 * No need to check key_size and value_size:
-	 * kernel has already checked them.
-	 */
-	if (bpf_map__type(map) != BPF_MAP_TYPE_PERF_EVENT_ARRAY) {
-		pr_debug("Map %s type is not BPF_MAP_TYPE_PERF_EVENT_ARRAY\n",
-			 map_name);
-		return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
-	}
-
-	op = bpf_map__add_newop(map, term);
-	if (IS_ERR(op))
-		return PTR_ERR(op);
-	op->op_type = BPF_MAP_OP_SET_EVSEL;
-	op->v.evsel = evsel;
-	return 0;
-}
-
-static int
-bpf_map__config_event(struct bpf_map *map,
-		      struct parse_events_term *term,
-		      struct evlist *evlist)
-{
-	if (!term->err_val) {
-		pr_debug("Config value not set\n");
-		return -BPF_LOADER_ERRNO__OBJCONF_CONF;
-	}
-
-	if (term->type_val != PARSE_EVENTS__TERM_TYPE_STR) {
-		pr_debug("ERROR: wrong value type for 'event'\n");
-		return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
-	}
-
-	return __bpf_map__config_event(map, term, evlist);
-}
-
-struct bpf_obj_config__map_func {
-	const char *config_opt;
-	int (*config_func)(struct bpf_map *, struct parse_events_term *,
-			   struct evlist *);
-};
-
-struct bpf_obj_config__map_func bpf_obj_config__map_funcs[] = {
-	{"value", bpf_map__config_value},
-	{"event", bpf_map__config_event},
-};
-
-static int
-bpf__obj_config_map(struct bpf_object *obj,
-		    struct parse_events_term *term,
-		    struct evlist *evlist,
-		    int *key_scan_pos)
-{
-	/* key is "map:<mapname>.<config opt>" */
-	char *map_name = strdup(term->config + sizeof("map:") - 1);
-	struct bpf_map *map;
-	int err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
-	char *map_opt;
-	size_t i;
-
-	if (!map_name)
-		return -ENOMEM;
-
-	map_opt = strchr(map_name, '.');
-	if (!map_opt) {
-		pr_debug("ERROR: Invalid map config: %s\n", map_name);
-		goto out;
-	}
-
-	*map_opt++ = '\0';
-	if (*map_opt == '\0') {
-		pr_debug("ERROR: Invalid map option: %s\n", term->config);
-		goto out;
-	}
-
-	map = bpf_object__find_map_by_name(obj, map_name);
-	if (!map) {
-		pr_debug("ERROR: Map %s doesn't exist\n", map_name);
-		err = -BPF_LOADER_ERRNO__OBJCONF_MAP_NOTEXIST;
-		goto out;
-	}
-
-	for (i = 0; i < ARRAY_SIZE(bpf_obj_config__map_funcs); i++) {
-		struct bpf_obj_config__map_func *func =
-				&bpf_obj_config__map_funcs[i];
-
-		if (strcmp(map_opt, func->config_opt) == 0) {
-			err = func->config_func(map, term, evlist);
-			goto out;
-		}
-	}
-
-	pr_debug("ERROR: Invalid map config option '%s'\n", map_opt);
-	err = -BPF_LOADER_ERRNO__OBJCONF_MAP_OPT;
-out:
-	if (!err)
-		*key_scan_pos += strlen(map_opt);
-
-	free(map_name);
-	return err;
-}
-
-int bpf__config_obj(struct bpf_object *obj,
-		    struct parse_events_term *term,
-		    struct evlist *evlist,
-		    int *error_pos)
-{
-	int key_scan_pos = 0;
-	int err;
-
-	if (!obj || !term || !term->config)
-		return -EINVAL;
-
-	if (strstarts(term->config, "map:")) {
-		key_scan_pos = sizeof("map:") - 1;
-		err = bpf__obj_config_map(obj, term, evlist, &key_scan_pos);
-		goto out;
-	}
-	err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
-out:
-	if (error_pos)
-		*error_pos = key_scan_pos;
-	return err;
-
-}
-
-typedef int (*map_config_func_t)(const char *name, int map_fd,
-				 const struct bpf_map *map,
-				 struct bpf_map_op *op,
-				 void *pkey, void *arg);
-static int
-foreach_key_array_all(map_config_func_t func,
-		      void *arg, const char *name,
-		      int map_fd, const struct bpf_map *map,
-		      struct bpf_map_op *op)
-{
-	unsigned int i;
-	int err;
-
-	for (i = 0; i < bpf_map__max_entries(map); i++) {
-		err = func(name, map_fd, map, op, &i, arg);
-		if (err) {
-			pr_debug("ERROR: failed to insert value to %s[%u]\n",
-				 name, i);
-			return err;
-		}
-	}
-	return 0;
-}
-
-
-static int
-bpf_map_config_foreach_key(struct bpf_map *map,
-			   map_config_func_t func,
-			   void *arg)
-{
-	int err, map_fd, type;
-	struct bpf_map_op *op;
-	const char *name = bpf_map__name(map);
-	struct bpf_map_priv *priv = map_priv(map);
-
-	if (IS_ERR(priv)) {
-		pr_debug("ERROR: failed to get private from map %s\n", name);
-		return -BPF_LOADER_ERRNO__INTERNAL;
-	}
-	if (!priv || list_empty(&priv->ops_list)) {
-		pr_debug("INFO: nothing to config for map %s\n", name);
-		return 0;
-	}
-
-	if (!map) {
-		pr_debug("Map '%s' is invalid\n", name);
-		return -BPF_LOADER_ERRNO__INTERNAL;
-	}
-	map_fd = bpf_map__fd(map);
-	if (map_fd < 0) {
-		pr_debug("ERROR: failed to get fd from map %s\n", name);
-		return map_fd;
-	}
-
-	type = bpf_map__type(map);
-	list_for_each_entry(op, &priv->ops_list, list) {
-		switch (type) {
-		case BPF_MAP_TYPE_ARRAY:
-		case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
-			switch (op->key_type) {
-			case BPF_MAP_KEY_ALL:
-				err = foreach_key_array_all(func, arg, name,
-							    map_fd, map, op);
-				break;
-			default:
-				pr_debug("ERROR: keytype for map '%s' invalid\n",
-					 name);
-				return -BPF_LOADER_ERRNO__INTERNAL;
-			}
-			if (err)
-				return err;
-			break;
-		default:
-			pr_debug("ERROR: type of '%s' incorrect\n", name);
-			return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
-		}
-	}
-
-	return 0;
-}
-
-static int
-apply_config_value_for_key(int map_fd, void *pkey,
-			   size_t val_size, u64 val)
-{
-	int err = 0;
-
-	switch (val_size) {
-	case 1: {
-		u8 _val = (u8)(val);
-		err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
-		break;
-	}
-	case 2: {
-		u16 _val = (u16)(val);
-		err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
-		break;
-	}
-	case 4: {
-		u32 _val = (u32)(val);
-		err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
-		break;
-	}
-	case 8: {
-		err = bpf_map_update_elem(map_fd, pkey, &val, BPF_ANY);
-		break;
-	}
-	default:
-		pr_debug("ERROR: invalid value size\n");
-		return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
-	}
-	if (err && errno)
-		err = -errno;
-	return err;
-}
-
-static int
-apply_config_evsel_for_key(const char *name, int map_fd, void *pkey,
-			   struct evsel *evsel)
-{
-	struct xyarray *xy = evsel->core.fd;
-	struct perf_event_attr *attr;
-	unsigned int key, events;
-	bool check_pass = false;
-	int *evt_fd;
-	int err;
-
-	if (!xy) {
-		pr_debug("ERROR: evsel not ready for map %s\n", name);
-		return -BPF_LOADER_ERRNO__INTERNAL;
-	}
-
-	if (xy->row_size / xy->entry_size != 1) {
-		pr_debug("ERROR: Dimension of target event is incorrect for map %s\n",
-			 name);
-		return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM;
-	}
-
-	attr = &evsel->core.attr;
-	if (attr->inherit) {
-		pr_debug("ERROR: Can't put inherit event into map %s\n", name);
-		return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH;
-	}
-
-	if (evsel__is_bpf_output(evsel))
-		check_pass = true;
-	if (attr->type == PERF_TYPE_RAW)
-		check_pass = true;
-	if (attr->type == PERF_TYPE_HARDWARE)
-		check_pass = true;
-	if (!check_pass) {
-		pr_debug("ERROR: Event type is wrong for map %s\n", name);
-		return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE;
-	}
-
-	events = xy->entries / (xy->row_size / xy->entry_size);
-	key = *((unsigned int *)pkey);
-	if (key >= events) {
-		pr_debug("ERROR: there is no event %d for map %s\n",
-			 key, name);
-		return -BPF_LOADER_ERRNO__OBJCONF_MAP_MAPSIZE;
-	}
-	evt_fd = xyarray__entry(xy, key, 0);
-	err = bpf_map_update_elem(map_fd, pkey, evt_fd, BPF_ANY);
-	if (err && errno)
-		err = -errno;
-	return err;
-}
-
-static int
-apply_obj_config_map_for_key(const char *name, int map_fd,
-			     const struct bpf_map *map,
-			     struct bpf_map_op *op,
-			     void *pkey, void *arg __maybe_unused)
-{
-	int err;
-
-	switch (op->op_type) {
-	case BPF_MAP_OP_SET_VALUE:
-		err = apply_config_value_for_key(map_fd, pkey,
-						 bpf_map__value_size(map),
-						 op->v.value);
-		break;
-	case BPF_MAP_OP_SET_EVSEL:
-		err = apply_config_evsel_for_key(name, map_fd, pkey,
-						 op->v.evsel);
-		break;
-	default:
-		pr_debug("ERROR: unknown value type for '%s'\n", name);
-		err = -BPF_LOADER_ERRNO__INTERNAL;
-	}
-	return err;
-}
-
-static int
-apply_obj_config_map(struct bpf_map *map)
-{
-	return bpf_map_config_foreach_key(map,
-					  apply_obj_config_map_for_key,
-					  NULL);
-}
-
-static int
-apply_obj_config_object(struct bpf_object *obj)
-{
-	struct bpf_map *map;
-	int err;
-
-	bpf_object__for_each_map(map, obj) {
-		err = apply_obj_config_map(map);
-		if (err)
-			return err;
-	}
-	return 0;
-}
-
-int bpf__apply_obj_config(void)
-{
-	struct bpf_perf_object *perf_obj, *tmp;
-	int err;
-
-	bpf_perf_object__for_each(perf_obj, tmp) {
-		err = apply_obj_config_object(perf_obj->obj);
-		if (err)
-			return err;
-	}
-
-	return 0;
-}
-
-#define bpf__perf_for_each_map(map, pobj, tmp)			\
-	bpf_perf_object__for_each(pobj, tmp)			\
-		bpf_object__for_each_map(map, pobj->obj)
-
-#define bpf__perf_for_each_map_named(map, pobj, pobjtmp, name)	\
-	bpf__perf_for_each_map(map, pobj, pobjtmp)		\
-		if (bpf_map__name(map) && (strcmp(name, bpf_map__name(map)) == 0))
-
-struct evsel *bpf__setup_output_event(struct evlist *evlist, const char *name)
-{
-	struct bpf_map_priv *tmpl_priv = NULL;
-	struct bpf_perf_object *perf_obj, *tmp;
-	struct evsel *evsel = NULL;
-	struct bpf_map *map;
-	int err;
-	bool need_init = false;
-
-	bpf__perf_for_each_map_named(map, perf_obj, tmp, name) {
-		struct bpf_map_priv *priv = map_priv(map);
-
-		if (IS_ERR(priv))
-			return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);
-
-		/*
-		 * No need to check map type: type should have been
-		 * verified by kernel.
-		 */
-		if (!need_init && !priv)
-			need_init = !priv;
-		if (!tmpl_priv && priv)
-			tmpl_priv = priv;
-	}
-
-	if (!need_init)
-		return NULL;
-
-	if (!tmpl_priv) {
-		char *event_definition = NULL;
-
-		if (asprintf(&event_definition, "bpf-output/no-inherit=1,name=%s/", name) < 0)
-			return ERR_PTR(-ENOMEM);
-
-		err = parse_event(evlist, event_definition);
-		free(event_definition);
-
-		if (err) {
-			pr_debug("ERROR: failed to create the \"%s\" bpf-output event\n", name);
-			return ERR_PTR(-err);
-		}
-
-		evsel = evlist__last(evlist);
-	}
-
-	bpf__perf_for_each_map_named(map, perf_obj, tmp, name) {
-		struct bpf_map_priv *priv = map_priv(map);
-
-		if (IS_ERR(priv))
-			return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);
-		if (priv)
-			continue;
-
-		if (tmpl_priv) {
-			priv = bpf_map_priv__clone(tmpl_priv);
-			if (!priv)
-				return ERR_PTR(-ENOMEM);
-
-			err = map_set_priv(map, priv);
-			if (err) {
-				bpf_map_priv__clear(map, priv);
-				return ERR_PTR(err);
-			}
-		} else if (evsel) {
-			struct bpf_map_op *op;
-
-			op = bpf_map__add_newop(map, NULL);
-			if (IS_ERR(op))
-				return ERR_CAST(op);
-			op->op_type = BPF_MAP_OP_SET_EVSEL;
-			op->v.evsel = evsel;
-		}
-	}
-
-	return evsel;
-}
-
-int bpf__setup_stdout(struct evlist *evlist)
-{
-	struct evsel *evsel = bpf__setup_output_event(evlist, "__bpf_stdout__");
-	return PTR_ERR_OR_ZERO(evsel);
-}
-
-#define ERRNO_OFFSET(e)		((e) - __BPF_LOADER_ERRNO__START)
-#define ERRCODE_OFFSET(c)	ERRNO_OFFSET(BPF_LOADER_ERRNO__##c)
-#define NR_ERRNO	(__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)
-
-static const char *bpf_loader_strerror_table[NR_ERRNO] = {
-	[ERRCODE_OFFSET(CONFIG)]	= "Invalid config string",
-	[ERRCODE_OFFSET(GROUP)]		= "Invalid group name",
-	[ERRCODE_OFFSET(EVENTNAME)]	= "No event name found in config string",
-	[ERRCODE_OFFSET(INTERNAL)]	= "BPF loader internal error",
-	[ERRCODE_OFFSET(COMPILE)]	= "Error when compiling BPF scriptlet",
-	[ERRCODE_OFFSET(PROGCONF_TERM)]	= "Invalid program config term in config string",
-	[ERRCODE_OFFSET(PROLOGUE)]	= "Failed to generate prologue",
-	[ERRCODE_OFFSET(PROLOGUE2BIG)]	= "Prologue too big for program",
-	[ERRCODE_OFFSET(PROLOGUEOOB)]	= "Offset out of bound for prologue",
-	[ERRCODE_OFFSET(OBJCONF_OPT)]	= "Invalid object config option",
-	[ERRCODE_OFFSET(OBJCONF_CONF)]	= "Config value not set (missing '=')",
-	[ERRCODE_OFFSET(OBJCONF_MAP_OPT)]	= "Invalid object map config option",
-	[ERRCODE_OFFSET(OBJCONF_MAP_NOTEXIST)]	= "Target map doesn't exist",
-	[ERRCODE_OFFSET(OBJCONF_MAP_VALUE)]	= "Incorrect value type for map",
-	[ERRCODE_OFFSET(OBJCONF_MAP_TYPE)]	= "Incorrect map type",
-	[ERRCODE_OFFSET(OBJCONF_MAP_KEYSIZE)]	= "Incorrect map key size",
-	[ERRCODE_OFFSET(OBJCONF_MAP_VALUESIZE)]	= "Incorrect map value size",
-	[ERRCODE_OFFSET(OBJCONF_MAP_NOEVT)]	= "Event not found for map setting",
-	[ERRCODE_OFFSET(OBJCONF_MAP_MAPSIZE)]	= "Invalid map size for event setting",
-	[ERRCODE_OFFSET(OBJCONF_MAP_EVTDIM)]	= "Event dimension too large",
-	[ERRCODE_OFFSET(OBJCONF_MAP_EVTINH)]	= "Doesn't support inherit event",
-	[ERRCODE_OFFSET(OBJCONF_MAP_EVTTYPE)]	= "Wrong event type for map",
-	[ERRCODE_OFFSET(OBJCONF_MAP_IDX2BIG)]	= "Index too large",
-};
-
-static int
-bpf_loader_strerror(int err, char *buf, size_t size)
-{
-	char sbuf[STRERR_BUFSIZE];
-	const char *msg;
-
-	if (!buf || !size)
-		return -1;
-
-	err = err > 0 ? err : -err;
-
-	if (err >= __LIBBPF_ERRNO__START)
-		return libbpf_strerror(err, buf, size);
-
-	if (err >= __BPF_LOADER_ERRNO__START && err < __BPF_LOADER_ERRNO__END) {
-		msg = bpf_loader_strerror_table[ERRNO_OFFSET(err)];
-		snprintf(buf, size, "%s", msg);
-		buf[size - 1] = '\0';
-		return 0;
-	}
-
-	if (err >= __BPF_LOADER_ERRNO__END)
-		snprintf(buf, size, "Unknown bpf loader error %d", err);
-	else
-		snprintf(buf, size, "%s",
-			 str_error_r(err, sbuf, sizeof(sbuf)));
-
-	buf[size - 1] = '\0';
-	return -1;
-}
-
-#define bpf__strerror_head(err, buf, size) \
-	char sbuf[STRERR_BUFSIZE], *emsg;\
-	if (!size)\
-		return 0;\
-	if (err < 0)\
-		err = -err;\
-	bpf_loader_strerror(err, sbuf, sizeof(sbuf));\
-	emsg = sbuf;\
-	switch (err) {\
-	default:\
-		scnprintf(buf, size, "%s", emsg);\
-		break;
-
-#define bpf__strerror_entry(val, fmt...)\
-	case val: {\
-		scnprintf(buf, size, fmt);\
-		break;\
-	}
-
-#define bpf__strerror_end(buf, size)\
-	}\
-	buf[size - 1] = '\0';
-
-int bpf__strerror_prepare_load(const char *filename, bool source,
-			       int err, char *buf, size_t size)
-{
-	size_t n;
-	int ret;
-
-	n = snprintf(buf, size, "Failed to load %s%s: ",
-			 filename, source ? " from source" : "");
-	if (n >= size) {
-		buf[size - 1] = '\0';
-		return 0;
-	}
-	buf += n;
-	size -= n;
-
-	ret = bpf_loader_strerror(err, buf, size);
-	buf[size - 1] = '\0';
-	return ret;
-}
-
-int bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
-			int err, char *buf, size_t size)
-{
-	bpf__strerror_head(err, buf, size);
-	case BPF_LOADER_ERRNO__PROGCONF_TERM: {
-		scnprintf(buf, size, "%s (add -v to see detail)", emsg);
-		break;
-	}
-	bpf__strerror_entry(EEXIST, "Probe point exist. Try 'perf probe -d \"*\"' and set 'force=yes'");
-	bpf__strerror_entry(EACCES, "You need to be root");
-	bpf__strerror_entry(EPERM, "You need to be root, and /proc/sys/kernel/kptr_restrict should be 0");
-	bpf__strerror_entry(ENOENT, "You need to check probing points in BPF file");
-	bpf__strerror_end(buf, size);
-	return 0;
-}
-
-int bpf__strerror_load(struct bpf_object *obj,
-		       int err, char *buf, size_t size)
-{
-	bpf__strerror_head(err, buf, size);
-	case LIBBPF_ERRNO__KVER: {
-		unsigned int obj_kver = bpf_object__kversion(obj);
-		unsigned int real_kver;
-
-		if (fetch_kernel_version(&real_kver, NULL, 0)) {
-			scnprintf(buf, size, "Unable to fetch kernel version");
-			break;
-		}
-
-		if (obj_kver != real_kver) {
-			scnprintf(buf, size,
-				  "'version' ("KVER_FMT") doesn't match running kernel ("KVER_FMT")",
-				  KVER_PARAM(obj_kver),
-				  KVER_PARAM(real_kver));
-			break;
-		}
-
-		scnprintf(buf, size, "Failed to load program for unknown reason");
-		break;
-	}
-	bpf__strerror_end(buf, size);
-	return 0;
-}
-
-int bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
-			     struct parse_events_term *term __maybe_unused,
-			     struct evlist *evlist __maybe_unused,
-			     int *error_pos __maybe_unused, int err,
-			     char *buf, size_t size)
-{
-	bpf__strerror_head(err, buf, size);
-	bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE,
-			    "Can't use this config term with this map type");
-	bpf__strerror_end(buf, size);
-	return 0;
-}
-
-int bpf__strerror_apply_obj_config(int err, char *buf, size_t size)
-{
-	bpf__strerror_head(err, buf, size);
-	bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM,
-			    "Cannot set event to BPF map in multi-thread tracing");
-	bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH,
-			    "%s (Hint: use -i to turn off inherit)", emsg);
-	bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE,
-			    "Can only put raw, hardware and BPF output event into a BPF map");
-	bpf__strerror_end(buf, size);
-	return 0;
-}
-
-int bpf__strerror_setup_output_event(struct evlist *evlist __maybe_unused,
-				     int err, char *buf, size_t size)
-{
-	bpf__strerror_head(err, buf, size);
-	bpf__strerror_end(buf, size);
-	return 0;
-}