v4.19.13 snapshot.
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
new file mode 100644
index 0000000..47aac41
--- /dev/null
+++ b/tools/perf/util/bpf-loader.c
@@ -0,0 +1,1801 @@
+// 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 <errno.h>
+#include "perf.h"
+#include "debug.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 "llvm-utils.h"
+#include "c++/clang-c.h"
+
+#define DEFINE_PRINT_FN(name, level) \
+static int libbpf_##name(const char *fmt, ...) \
+{ \
+ va_list args; \
+ int ret; \
+ \
+ va_start(args, fmt); \
+ ret = veprintf(level, verbose, pr_fmt(fmt), args);\
+ va_end(args); \
+ return ret; \
+}
+
+DEFINE_PRINT_FN(warning, 1)
+DEFINE_PRINT_FN(info, 1)
+DEFINE_PRINT_FN(debug, 1)
+
+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_warning,
+ libbpf_info,
+ libbpf_debug);
+ 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_warning,
+ libbpf_info,
+ libbpf_debug);
+ 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: successfull 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;
+
+ config_str = bpf_program__title(prog, false);
+ if (IS_ERR(config_str)) {
+ pr_debug("bpf: unable to get title for program\n");
+ return PTR_ERR(config_str);
+ }
+
+ priv = calloc(sizeof(*priv), 1);
+ if (!priv) {
+ pr_debug("bpf: failed to alloc priv\n");
+ return -ENOMEM;
+ }
+ pev = &priv->pev;
+
+ 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__title(prog, false);
+ if (!title)
+ title = "[unknown]";
+
+ 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, 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, 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 perf_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(&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 perf_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 perf_evlist *evlist)
+{
+ struct perf_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 perf_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 perf_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 perf_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:
+ free(map_name);
+ if (!err)
+ key_scan_pos += strlen(map_opt);
+ return err;
+}
+
+int bpf__config_obj(struct bpf_object *obj,
+ struct parse_events_term *term,
+ struct perf_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 perf_evsel *evsel)
+{
+ struct xyarray *xy = evsel->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->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 (perf_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_map__for_each(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_map__for_each(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 perf_evsel *bpf__setup_output_event(struct perf_evlist *evlist, const char *name)
+{
+ struct bpf_map_priv *tmpl_priv = NULL;
+ struct bpf_object *obj, *tmp;
+ struct perf_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 = perf_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_PTR(PTR_ERR(op));
+ op->op_type = BPF_MAP_OP_SET_EVSEL;
+ op->v.evsel = evsel;
+ }
+ }
+
+ return evsel;
+}
+
+int bpf__setup_stdout(struct perf_evlist *evlist)
+{
+ struct perf_evsel *evsel = bpf__setup_output_event(evlist, "__bpf_stdout__");
+ return IS_ERR(evsel) ? PTR_ERR(evsel) : 0;
+}
+
+#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 perf_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 perf_evlist *evlist __maybe_unused,
+ int err, char *buf, size_t size)
+{
+ bpf__strerror_head(err, buf, size);
+ bpf__strerror_end(buf, size);
+ return 0;
+}