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Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

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orangepi/linux-orangepi-5.10.y.git/trunk/tools/perf/util/bpf-loader.c
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// 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/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 "c++/clang-c.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;
};
 
static bool libbpf_initialized;
 
struct bpf_object *
bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
{
<------>struct bpf_object *obj;
 
<------>if (!libbpf_initialized) {
<------><------>libbpf_set_print(libbpf_perf_print);
<------><------>libbpf_initialized = true;
<------>}
 
<------>obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, name);
<------>if (IS_ERR_OR_NULL(obj)) {
<------><------>pr_debug("bpf: failed to load buffer\n");
<------><------>return ERR_PTR(-EINVAL);
<------>}
 
<------>return obj;
}
 
struct bpf_object *bpf__prepare_load(const char *filename, bool source)
{
<------>struct bpf_object *obj;
 
<------>if (!libbpf_initialized) {
<------><------>libbpf_set_print(libbpf_perf_print);
<------><------>libbpf_initialized = true;
<------>}
 
<------>if (source) {
<------><------>int err;
<------><------>void *obj_buf;
<------><------>size_t obj_buf_sz;
 
<------><------>perf_clang__init();
<------><------>err = perf_clang__compile_bpf(filename, &obj_buf, &obj_buf_sz);
<------><------>perf_clang__cleanup();
<------><------>if (err) {
<------><------><------>pr_debug("bpf: builtin compilation failed: %d, try external compiler\n", err);
<------><------><------>err = llvm__compile_bpf(filename, &obj_buf, &obj_buf_sz);
<------><------><------>if (err)
<------><------><------><------>return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
<------><------>} else
<------><------><------>pr_debug("bpf: successful builtin compilation\n");
<------><------>obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename);
 
<------><------>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;
<------>}
 
<------>return obj;
}
 
void bpf__clear(void)
{
<------>struct bpf_object *obj, *tmp;
 
<------>bpf_object__for_each_safe(obj, tmp) {
<------><------>bpf__unprobe(obj);
<------><------>bpf_object__close(obj);
<------>}
}
 
static void
clear_prog_priv(struct bpf_program *prog __maybe_unused,
<------><------>void *_priv)
{
<------>struct bpf_prog_priv *priv = _priv;
 
<------>cleanup_perf_probe_events(&priv->pev, 1);
<------>zfree(&priv->insns_buf);
<------>zfree(&priv->type_mapping);
<------>zfree(&priv->sys_name);
<------>zfree(&priv->evt_name);
<------>free(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 = bpf_program__set_priv(prog, priv, clear_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,
<------><------>     struct bpf_insn *orig_insns, int orig_insns_cnt,
<------><------>     struct bpf_prog_prep_result *res)
{
<------>struct bpf_prog_priv *priv = bpf_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(priv) || !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;
<------>res->pfd = NULL;
<------>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 = bpf_program__priv(prog);
<------>struct perf_probe_event *pev;
<------>bool need_prologue = false;
<------>int err, i;
 
<------>if (IS_ERR(priv) || !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->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);
 
<------>err = map_prologue(pev, priv->type_mapping, &priv->nr_types);
<------>if (err)
<------><------>return err;
 
<------>err = bpf_program__set_prep(prog, priv->nr_types,
<------><------><------><------>    preproc_gen_prologue);
<------>return err;
}
 
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 = bpf_program__priv(prog);
<------><------>if (IS_ERR(priv) || !priv) {
<------><------><------>err = PTR_ERR(priv);
<------><------><------>goto out;
<------><------>}
 
<------><------>if (priv->is_tp) {
<------><------><------>bpf_program__set_tracepoint(prog);
<------><------><------>continue;
<------><------>}
 
<------><------>bpf_program__set_kprobe(prog);
<------><------>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_preprocessorr() 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 = bpf_program__priv(prog);
<------><------>int i;
 
<------><------>if (IS_ERR(priv) || !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;
}
 
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 0;
}
 
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 = bpf_program__priv(prog);
<------><------>struct probe_trace_event *tev;
<------><------>struct perf_probe_event *pev;
<------><------>int i, fd;
 
<------><------>if (IS_ERR(priv) || !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) {
<------><------><------><------>int type = priv->type_mapping[i];
 
<------><------><------><------>fd = bpf_program__nth_fd(prog, type);
<------><------><------>} 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,
<------>BPF_MAP_KEY_RANGES,
};
 
struct bpf_map_op {
<------>struct list_head list;
<------>enum bpf_map_op_type op_type;
<------>enum bpf_map_key_type key_type;
<------>union {
<------><------>struct parse_events_array array;
<------>} k;
<------>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);
<------>if (op->key_type == BPF_MAP_KEY_RANGES)
<------><------>parse_events__clear_array(&op->k.array);
<------>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(struct bpf_map *map __maybe_unused,
<------><------>    void *_priv)
{
<------>struct bpf_map_priv *priv = _priv;
 
<------>bpf_map_priv__purge(priv);
<------>free(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;
 
<------>if (term->array.nr_ranges) {
<------><------>size_t memsz = term->array.nr_ranges *
<------><------><------><------>sizeof(op->k.array.ranges[0]);
 
<------><------>op->k.array.ranges = memdup(term->array.ranges, memsz);
<------><------>if (!op->k.array.ranges) {
<------><------><------>pr_debug("Not enough memory to alloc indices for map\n");
<------><------><------>return -ENOMEM;
<------><------>}
<------><------>op->key_type = BPF_MAP_KEY_RANGES;
<------><------>op->k.array.nr_ranges = term->array.nr_ranges;
<------>}
<------>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);
<------>if (op->key_type == BPF_MAP_KEY_RANGES) {
<------><------>size_t memsz = op->k.array.nr_ranges *
<------><------><------>       sizeof(op->k.array.ranges[0]);
 
<------><------>newop->k.array.ranges = memdup(op->k.array.ranges, memsz);
<------><------>if (!newop->k.array.ranges) {
<------><------><------>pr_debug("Failed to alloc indices for map\n");
<------><------><------>free(newop);
<------><------><------>return NULL;
<------><------>}
<------>}
 
<------>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 = bpf_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 (bpf_map__set_priv(map, priv, bpf_map_priv__clear)) {
<------><------><------>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);
<------>const struct bpf_map_def *def = bpf_map__def(map);
 
<------>if (IS_ERR(def)) {
<------><------>pr_debug("Unable to get map definition from '%s'\n",
<------><------><------> map_name);
<------><------>return -BPF_LOADER_ERRNO__INTERNAL;
<------>}
 
<------>if (def->type != 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 (def->key_size < sizeof(unsigned int)) {
<------><------>pr_debug("Map %s has incorrect key size\n", map_name);
<------><------>return -BPF_LOADER_ERRNO__OBJCONF_MAP_KEYSIZE;
<------>}
<------>switch (def->value_size) {
<------>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 evsel *evsel;
<------>const struct bpf_map_def *def;
<------>struct bpf_map_op *op;
<------>const char *map_name = bpf_map__name(map);
 
<------>evsel = perf_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;
<------>}
 
<------>def = bpf_map__def(map);
<------>if (IS_ERR(def)) {
<------><------>pr_debug("Unable to get map definition from '%s'\n",
<------><------><------> map_name);
<------><------>return PTR_ERR(def);
<------>}
 
<------>/*
<------> * No need to check key_size and value_size:
<------> * kernel has already checked them.
<------> */
<------>if (def->type != 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
config_map_indices_range_check(struct parse_events_term *term,
<------><------><------>       struct bpf_map *map,
<------><------><------>       const char *map_name)
{
<------>struct parse_events_array *array = &term->array;
<------>const struct bpf_map_def *def;
<------>unsigned int i;
 
<------>if (!array->nr_ranges)
<------><------>return 0;
<------>if (!array->ranges) {
<------><------>pr_debug("ERROR: map %s: array->nr_ranges is %d but range array is NULL\n",
<------><------><------> map_name, (int)array->nr_ranges);
<------><------>return -BPF_LOADER_ERRNO__INTERNAL;
<------>}
 
<------>def = bpf_map__def(map);
<------>if (IS_ERR(def)) {
<------><------>pr_debug("ERROR: Unable to get map definition from '%s'\n",
<------><------><------> map_name);
<------><------>return -BPF_LOADER_ERRNO__INTERNAL;
<------>}
 
<------>for (i = 0; i < array->nr_ranges; i++) {
<------><------>unsigned int start = array->ranges[i].start;
<------><------>size_t length = array->ranges[i].length;
<------><------>unsigned int idx = start + length - 1;
 
<------><------>if (idx >= def->max_entries) {
<------><------><------>pr_debug("ERROR: index %d too large\n", idx);
<------><------><------>return -BPF_LOADER_ERRNO__OBJCONF_MAP_IDX2BIG;
<------><------>}
<------>}
<------>return 0;
}
 
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;
<------>}
 
<------>*key_scan_pos += strlen(map_opt);
<------>err = config_map_indices_range_check(term, map, map_name);
<------>if (err)
<------><------>goto out;
<------>*key_scan_pos -= strlen(map_opt);
 
<------>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_def *pdef,
<------><------><------><------> 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_def *pdef,
<------><------>      struct bpf_map_op *op)
{
<------>unsigned int i;
<------>int err;
 
<------>for (i = 0; i < pdef->max_entries; i++) {
<------><------>err = func(name, map_fd, pdef, op, &i, arg);
<------><------>if (err) {
<------><------><------>pr_debug("ERROR: failed to insert value to %s[%u]\n",
<------><------><------><------> name, i);
<------><------><------>return err;
<------><------>}
<------>}
<------>return 0;
}
 
static int
foreach_key_array_ranges(map_config_func_t func, void *arg,
<------><------><------> const char *name, int map_fd,
<------><------><------> const struct bpf_map_def *pdef,
<------><------><------> struct bpf_map_op *op)
{
<------>unsigned int i, j;
<------>int err;
 
<------>for (i = 0; i < op->k.array.nr_ranges; i++) {
<------><------>unsigned int start = op->k.array.ranges[i].start;
<------><------>size_t length = op->k.array.ranges[i].length;
 
<------><------>for (j = 0; j < length; j++) {
<------><------><------>unsigned int idx = start + j;
 
<------><------><------>err = func(name, map_fd, pdef, op, &idx, arg);
<------><------><------>if (err) {
<------><------><------><------>pr_debug("ERROR: failed to insert value to %s[%u]\n",
<------><------><------><------><------> name, idx);
<------><------><------><------>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;
<------>struct bpf_map_op *op;
<------>const struct bpf_map_def *def;
<------>const char *name = bpf_map__name(map);
<------>struct bpf_map_priv *priv = bpf_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;
<------>}
 
<------>def = bpf_map__def(map);
<------>if (IS_ERR(def)) {
<------><------>pr_debug("ERROR: failed to get definition from map %s\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;
<------>}
 
<------>list_for_each_entry(op, &priv->ops_list, list) {
<------><------>switch (def->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, def, op);
<------><------><------><------>break;
<------><------><------>case BPF_MAP_KEY_RANGES:
<------><------><------><------>err = foreach_key_array_ranges(func, arg, name,
<------><------><------><------><------><------><------>       map_fd, def,
<------><------><------><------><------><------><------>       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_def *pdef,
<------><------><------>     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,
<------><------><------><------><------><------> pdef->value_size,
<------><------><------><------><------><------> 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_object *obj, *tmp;
<------>int err;
 
<------>bpf_object__for_each_safe(obj, tmp) {
<------><------>err = apply_obj_config_object(obj);
<------><------>if (err)
<------><------><------>return err;
<------>}
 
<------>return 0;
}
 
#define bpf__for_each_map(pos, obj, objtmp)	\
<------>bpf_object__for_each_safe(obj, objtmp)	\
<------><------>bpf_object__for_each_map(pos, obj)
 
#define bpf__for_each_map_named(pos, obj, objtmp, name)	\
<------>bpf__for_each_map(pos, obj, objtmp) 		\
<------><------>if (bpf_map__name(pos) && 		\
<------><------><------>(strcmp(name, 			\
<------><------><------><------>bpf_map__name(pos)) == 0))
 
struct evsel *bpf__setup_output_event(struct evlist *evlist, const char *name)
{
<------>struct bpf_map_priv *tmpl_priv = NULL;
<------>struct bpf_object *obj, *tmp;
<------>struct evsel *evsel = NULL;
<------>struct bpf_map *map;
<------>int err;
<------>bool need_init = false;
 
<------>bpf__for_each_map_named(map, obj, tmp, name) {
<------><------>struct bpf_map_priv *priv = bpf_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_events(evlist, event_definition, NULL);
<------><------>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__for_each_map_named(map, obj, tmp, name) {
<------><------>struct bpf_map_priv *priv = bpf_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 = bpf_map__set_priv(map, priv, bpf_map_priv__clear);
<------><------><------>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;
}
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