diff options
Diffstat (limited to 'tools/perf/util/bpf-loader.c')
| -rw-r--r-- | tools/perf/util/bpf-loader.c | 2133 |
1 files changed, 2133 insertions, 0 deletions
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c new file mode 100644 index 000000000..f4adeccdb --- /dev/null +++ b/tools/perf/util/bpf-loader.c @@ -0,0 +1,2133 @@ +// 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 "c++/clang-c.h" +#ifdef HAVE_LIBBPF_SUPPORT +#include <bpf/hashmap.h> +#else +#include "util/hashmap.h" +#endif +#include "asm/bug.h" + +#include <internal/xyarray.h> + +#ifndef HAVE_LIBBPF_BPF_PROGRAM__SET_INSNS +int bpf_program__set_insns(struct bpf_program *prog __maybe_unused, + struct bpf_insn *new_insns __maybe_unused, size_t new_insn_cnt __maybe_unused) +{ + pr_err("%s: not support, update libbpf\n", __func__); + return -ENOTSUP; +} + +int libbpf_register_prog_handler(const char *sec __maybe_unused, + enum bpf_prog_type prog_type __maybe_unused, + enum bpf_attach_type exp_attach_type __maybe_unused, + const struct libbpf_prog_handler_opts *opts __maybe_unused) +{ + pr_err("%s: not support, update libbpf\n", __func__); + return -ENOTSUP; +} +#endif + +/* temporarily disable libbpf deprecation warnings */ +#pragma GCC diagnostic ignored "-Wdeprecated-declarations" + +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; + + 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_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->key, cur->value); + + 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 void *__key, void *ctx __maybe_unused) +{ + return (size_t) __key; +} + +static bool ptr_equal(const void *key1, const void *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, + 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(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->key, cur->value); + + 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; + + 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 = 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 +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; + 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; + } + + if (!map) { + pr_debug("Map '%s' is invalid\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 >= bpf_map__max_entries(map)) { + 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 *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 +foreach_key_array_ranges(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, 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, map, 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, 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; + case BPF_MAP_KEY_RANGES: + err = foreach_key_array_ranges(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; +} |