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1783 lines
40 KiB
1783 lines
40 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
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* bpf-loader.c |
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* |
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* Copyright (C) 2015 Wang Nan <[email protected]> |
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* Copyright (C) 2015 Huawei Inc. |
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*/ |
|
|
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#include <linux/bpf.h> |
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#include <bpf/libbpf.h> |
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#include <bpf/bpf.h> |
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#include <linux/err.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/zalloc.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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#include "debug.h" |
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#include "evlist.h" |
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#include "bpf-loader.h" |
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#include "bpf-prologue.h" |
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#include "probe-event.h" |
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#include "probe-finder.h" // for MAX_PROBES |
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#include "parse-events.h" |
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#include "strfilter.h" |
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#include "util.h" |
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#include "llvm-utils.h" |
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#include "c++/clang-c.h" |
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|
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#include <internal/xyarray.h> |
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|
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static int libbpf_perf_print(enum libbpf_print_level level __attribute__((unused)), |
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const char *fmt, va_list args) |
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{ |
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return veprintf(1, verbose, pr_fmt(fmt), args); |
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} |
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|
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struct bpf_prog_priv { |
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bool is_tp; |
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char *sys_name; |
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char *evt_name; |
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struct perf_probe_event pev; |
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bool need_prologue; |
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struct bpf_insn *insns_buf; |
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int nr_types; |
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int *type_mapping; |
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}; |
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|
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static bool libbpf_initialized; |
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|
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struct bpf_object * |
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bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name) |
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{ |
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struct bpf_object *obj; |
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|
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if (!libbpf_initialized) { |
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libbpf_set_print(libbpf_perf_print); |
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libbpf_initialized = true; |
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} |
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|
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obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, name); |
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if (IS_ERR_OR_NULL(obj)) { |
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pr_debug("bpf: failed to load buffer\n"); |
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return ERR_PTR(-EINVAL); |
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} |
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|
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return obj; |
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} |
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|
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struct bpf_object *bpf__prepare_load(const char *filename, bool source) |
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{ |
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struct bpf_object *obj; |
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|
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if (!libbpf_initialized) { |
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libbpf_set_print(libbpf_perf_print); |
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libbpf_initialized = true; |
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} |
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|
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if (source) { |
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int err; |
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void *obj_buf; |
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size_t obj_buf_sz; |
|
|
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perf_clang__init(); |
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err = perf_clang__compile_bpf(filename, &obj_buf, &obj_buf_sz); |
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perf_clang__cleanup(); |
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if (err) { |
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pr_debug("bpf: builtin compilation failed: %d, try external compiler\n", err); |
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err = llvm__compile_bpf(filename, &obj_buf, &obj_buf_sz); |
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if (err) |
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return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE); |
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} else |
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pr_debug("bpf: successful builtin compilation\n"); |
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obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename); |
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|
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if (!IS_ERR_OR_NULL(obj) && llvm_param.dump_obj) |
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llvm__dump_obj(filename, obj_buf, obj_buf_sz); |
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|
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free(obj_buf); |
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} else |
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obj = bpf_object__open(filename); |
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|
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if (IS_ERR_OR_NULL(obj)) { |
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pr_debug("bpf: failed to load %s\n", filename); |
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return obj; |
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} |
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|
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return obj; |
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} |
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|
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void bpf__clear(void) |
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{ |
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struct bpf_object *obj, *tmp; |
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|
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bpf_object__for_each_safe(obj, tmp) { |
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bpf__unprobe(obj); |
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bpf_object__close(obj); |
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} |
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} |
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|
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static void |
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clear_prog_priv(struct bpf_program *prog __maybe_unused, |
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void *_priv) |
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{ |
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struct bpf_prog_priv *priv = _priv; |
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|
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cleanup_perf_probe_events(&priv->pev, 1); |
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zfree(&priv->insns_buf); |
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zfree(&priv->type_mapping); |
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zfree(&priv->sys_name); |
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zfree(&priv->evt_name); |
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free(priv); |
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} |
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|
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static int |
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prog_config__exec(const char *value, struct perf_probe_event *pev) |
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{ |
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pev->uprobes = true; |
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pev->target = strdup(value); |
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if (!pev->target) |
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return -ENOMEM; |
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return 0; |
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} |
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|
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static int |
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prog_config__module(const char *value, struct perf_probe_event *pev) |
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{ |
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pev->uprobes = false; |
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pev->target = strdup(value); |
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if (!pev->target) |
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return -ENOMEM; |
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return 0; |
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} |
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|
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static int |
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prog_config__bool(const char *value, bool *pbool, bool invert) |
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{ |
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int err; |
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bool bool_value; |
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|
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if (!pbool) |
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return -EINVAL; |
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|
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err = strtobool(value, &bool_value); |
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if (err) |
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return err; |
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|
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*pbool = invert ? !bool_value : bool_value; |
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return 0; |
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} |
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|
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static int |
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prog_config__inlines(const char *value, |
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struct perf_probe_event *pev __maybe_unused) |
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{ |
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return prog_config__bool(value, &probe_conf.no_inlines, true); |
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} |
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|
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static int |
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prog_config__force(const char *value, |
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struct perf_probe_event *pev __maybe_unused) |
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{ |
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return prog_config__bool(value, &probe_conf.force_add, false); |
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} |
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|
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static struct { |
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const char *key; |
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const char *usage; |
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const char *desc; |
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int (*func)(const char *, struct perf_probe_event *); |
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} bpf_prog_config_terms[] = { |
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{ |
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.key = "exec", |
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.usage = "exec=<full path of file>", |
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.desc = "Set uprobe target", |
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.func = prog_config__exec, |
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}, |
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{ |
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.key = "module", |
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.usage = "module=<module name> ", |
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.desc = "Set kprobe module", |
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.func = prog_config__module, |
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}, |
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{ |
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.key = "inlines", |
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.usage = "inlines=[yes|no] ", |
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.desc = "Probe at inline symbol", |
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.func = prog_config__inlines, |
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}, |
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{ |
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.key = "force", |
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.usage = "force=[yes|no] ", |
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.desc = "Forcibly add events with existing name", |
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.func = prog_config__force, |
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}, |
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}; |
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|
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static int |
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do_prog_config(const char *key, const char *value, |
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struct perf_probe_event *pev) |
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{ |
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unsigned int i; |
|
|
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pr_debug("config bpf program: %s=%s\n", key, value); |
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for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++) |
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if (strcmp(key, bpf_prog_config_terms[i].key) == 0) |
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return bpf_prog_config_terms[i].func(value, pev); |
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|
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pr_debug("BPF: ERROR: invalid program config option: %s=%s\n", |
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key, value); |
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|
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pr_debug("\nHint: Valid options are:\n"); |
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for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++) |
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pr_debug("\t%s:\t%s\n", bpf_prog_config_terms[i].usage, |
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bpf_prog_config_terms[i].desc); |
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pr_debug("\n"); |
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|
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return -BPF_LOADER_ERRNO__PROGCONF_TERM; |
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} |
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|
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static const char * |
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parse_prog_config_kvpair(const char *config_str, struct perf_probe_event *pev) |
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{ |
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char *text = strdup(config_str); |
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char *sep, *line; |
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const char *main_str = NULL; |
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int err = 0; |
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|
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if (!text) { |
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pr_debug("Not enough memory: dup config_str failed\n"); |
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return ERR_PTR(-ENOMEM); |
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} |
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|
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line = text; |
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while ((sep = strchr(line, ';'))) { |
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char *equ; |
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|
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*sep = '\0'; |
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equ = strchr(line, '='); |
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if (!equ) { |
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pr_warning("WARNING: invalid config in BPF object: %s\n", |
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line); |
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pr_warning("\tShould be 'key=value'.\n"); |
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goto nextline; |
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} |
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*equ = '\0'; |
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|
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err = do_prog_config(line, equ + 1, pev); |
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if (err) |
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break; |
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nextline: |
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line = sep + 1; |
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} |
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|
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if (!err) |
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main_str = config_str + (line - text); |
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free(text); |
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|
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return err ? ERR_PTR(err) : main_str; |
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} |
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|
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static int |
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parse_prog_config(const char *config_str, const char **p_main_str, |
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bool *is_tp, struct perf_probe_event *pev) |
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{ |
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int err; |
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const char *main_str = parse_prog_config_kvpair(config_str, pev); |
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|
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if (IS_ERR(main_str)) |
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return PTR_ERR(main_str); |
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|
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*p_main_str = main_str; |
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if (!strchr(main_str, '=')) { |
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/* Is a tracepoint event? */ |
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const char *s = strchr(main_str, ':'); |
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|
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if (!s) { |
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pr_debug("bpf: '%s' is not a valid tracepoint\n", |
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config_str); |
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return -BPF_LOADER_ERRNO__CONFIG; |
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} |
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|
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*is_tp = true; |
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return 0; |
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} |
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|
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*is_tp = false; |
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err = parse_perf_probe_command(main_str, pev); |
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if (err < 0) { |
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pr_debug("bpf: '%s' is not a valid config string\n", |
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config_str); |
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/* parse failed, don't need clear pev. */ |
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return -BPF_LOADER_ERRNO__CONFIG; |
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} |
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return 0; |
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} |
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|
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static int |
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config_bpf_program(struct bpf_program *prog) |
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{ |
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struct perf_probe_event *pev = NULL; |
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struct bpf_prog_priv *priv = NULL; |
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const char *config_str, *main_str; |
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bool is_tp = false; |
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int err; |
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|
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/* Initialize per-program probing setting */ |
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probe_conf.no_inlines = false; |
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probe_conf.force_add = false; |
|
|
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priv = calloc(sizeof(*priv), 1); |
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if (!priv) { |
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pr_debug("bpf: failed to alloc priv\n"); |
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return -ENOMEM; |
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} |
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pev = &priv->pev; |
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|
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config_str = bpf_program__section_name(prog); |
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pr_debug("bpf: config program '%s'\n", config_str); |
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err = parse_prog_config(config_str, &main_str, &is_tp, pev); |
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if (err) |
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goto errout; |
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|
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if (is_tp) { |
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char *s = strchr(main_str, ':'); |
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|
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priv->is_tp = true; |
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priv->sys_name = strndup(main_str, s - main_str); |
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priv->evt_name = strdup(s + 1); |
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goto set_priv; |
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} |
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|
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if (pev->group && strcmp(pev->group, PERF_BPF_PROBE_GROUP)) { |
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pr_debug("bpf: '%s': group for event is set and not '%s'.\n", |
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config_str, PERF_BPF_PROBE_GROUP); |
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err = -BPF_LOADER_ERRNO__GROUP; |
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goto errout; |
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} else if (!pev->group) |
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pev->group = strdup(PERF_BPF_PROBE_GROUP); |
|
|
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if (!pev->group) { |
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pr_debug("bpf: strdup failed\n"); |
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err = -ENOMEM; |
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goto errout; |
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} |
|
|
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if (!pev->event) { |
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pr_debug("bpf: '%s': event name is missing. Section name should be 'key=value'\n", |
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config_str); |
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err = -BPF_LOADER_ERRNO__EVENTNAME; |
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goto errout; |
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} |
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pr_debug("bpf: config '%s' is ok\n", config_str); |
|
|
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set_priv: |
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err = bpf_program__set_priv(prog, priv, clear_prog_priv); |
|
if (err) { |
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pr_debug("Failed to set priv for program '%s'\n", config_str); |
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goto errout; |
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} |
|
|
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return 0; |
|
|
|
errout: |
|
if (pev) |
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clear_perf_probe_event(pev); |
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free(priv); |
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return err; |
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} |
|
|
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static int bpf__prepare_probe(void) |
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{ |
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static int err = 0; |
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static bool initialized = false; |
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|
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/* |
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* Make err static, so if init failed the first, bpf__prepare_probe() |
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* fails each time without calling init_probe_symbol_maps multiple |
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* times. |
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*/ |
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if (initialized) |
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return err; |
|
|
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initialized = true; |
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err = init_probe_symbol_maps(false); |
|
if (err < 0) |
|
pr_debug("Failed to init_probe_symbol_maps\n"); |
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probe_conf.max_probes = MAX_PROBES; |
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return err; |
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} |
|
|
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static int |
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preproc_gen_prologue(struct bpf_program *prog, int n, |
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struct bpf_insn *orig_insns, int orig_insns_cnt, |
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struct bpf_prog_prep_result *res) |
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{ |
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struct bpf_prog_priv *priv = bpf_program__priv(prog); |
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struct probe_trace_event *tev; |
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struct perf_probe_event *pev; |
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struct bpf_insn *buf; |
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size_t prologue_cnt = 0; |
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int i, err; |
|
|
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if (IS_ERR(priv) || !priv || priv->is_tp) |
|
goto errout; |
|
|
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pev = &priv->pev; |
|
|
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if (n < 0 || n >= priv->nr_types) |
|
goto errout; |
|
|
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/* Find a tev belongs to that type */ |
|
for (i = 0; i < pev->ntevs; i++) { |
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if (priv->type_mapping[i] == n) |
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break; |
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} |
|
|
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if (i >= pev->ntevs) { |
|
pr_debug("Internal error: prologue type %d not found\n", n); |
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return -BPF_LOADER_ERRNO__PROLOGUE; |
|
} |
|
|
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tev = &pev->tevs[i]; |
|
|
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buf = priv->insns_buf; |
|
err = bpf__gen_prologue(tev->args, tev->nargs, |
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buf, &prologue_cnt, |
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BPF_MAXINSNS - orig_insns_cnt); |
|
if (err) { |
|
const char *title; |
|
|
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title = bpf_program__section_name(prog); |
|
pr_debug("Failed to generate prologue for program %s\n", |
|
title); |
|
return err; |
|
} |
|
|
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memcpy(&buf[prologue_cnt], orig_insns, |
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sizeof(struct bpf_insn) * orig_insns_cnt); |
|
|
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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; |
|
|
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ret = tev2->nargs - tev1->nargs; |
|
if (ret) |
|
return ret; |
|
|
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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_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 = bpf_program__priv(prog); |
|
int i; |
|
|
|
if (IS_ERR(priv) || !priv || priv->is_tp) |
|
continue; |
|
|
|
for (i = 0; i < priv->pev.ntevs; i++) { |
|
struct probe_trace_event *tev = &priv->pev.tevs[i]; |
|
char name_buf[EVENTS_WRITE_BUFSIZE]; |
|
struct strfilter *delfilter; |
|
|
|
snprintf(name_buf, EVENTS_WRITE_BUFSIZE, |
|
"%s:%s", tev->group, tev->event); |
|
name_buf[EVENTS_WRITE_BUFSIZE - 1] = '\0'; |
|
|
|
delfilter = strfilter__new(name_buf, NULL); |
|
if (!delfilter) { |
|
pr_debug("Failed to create filter for unprobing\n"); |
|
ret = -ENOMEM; |
|
continue; |
|
} |
|
|
|
err = del_perf_probe_events(delfilter); |
|
strfilter__delete(delfilter); |
|
if (err) { |
|
pr_debug("Failed to delete %s\n", name_buf); |
|
ret = err; |
|
continue; |
|
} |
|
} |
|
} |
|
return ret; |
|
} |
|
|
|
int bpf__load(struct bpf_object *obj) |
|
{ |
|
int err; |
|
|
|
err = bpf_object__load(obj); |
|
if (err) { |
|
char bf[128]; |
|
libbpf_strerror(err, bf, sizeof(bf)); |
|
pr_debug("bpf: load objects failed: err=%d: (%s)\n", err, bf); |
|
return err; |
|
} |
|
return 0; |
|
} |
|
|
|
int bpf__foreach_event(struct bpf_object *obj, |
|
bpf_prog_iter_callback_t func, |
|
void *arg) |
|
{ |
|
struct bpf_program *prog; |
|
int err; |
|
|
|
bpf_object__for_each_program(prog, obj) { |
|
struct bpf_prog_priv *priv = bpf_program__priv(prog); |
|
struct probe_trace_event *tev; |
|
struct perf_probe_event *pev; |
|
int i, fd; |
|
|
|
if (IS_ERR(priv) || !priv) { |
|
pr_debug("bpf: failed to get private field\n"); |
|
return -BPF_LOADER_ERRNO__INTERNAL; |
|
} |
|
|
|
if (priv->is_tp) { |
|
fd = bpf_program__fd(prog); |
|
err = (*func)(priv->sys_name, priv->evt_name, fd, obj, arg); |
|
if (err) { |
|
pr_debug("bpf: tracepoint call back failed, stop iterate\n"); |
|
return err; |
|
} |
|
continue; |
|
} |
|
|
|
pev = &priv->pev; |
|
for (i = 0; i < pev->ntevs; i++) { |
|
tev = &pev->tevs[i]; |
|
|
|
if (priv->need_prologue) { |
|
int type = priv->type_mapping[i]; |
|
|
|
fd = bpf_program__nth_fd(prog, type); |
|
} else { |
|
fd = bpf_program__fd(prog); |
|
} |
|
|
|
if (fd < 0) { |
|
pr_debug("bpf: failed to get file descriptor\n"); |
|
return fd; |
|
} |
|
|
|
err = (*func)(tev->group, tev->event, fd, obj, arg); |
|
if (err) { |
|
pr_debug("bpf: call back failed, stop iterate\n"); |
|
return err; |
|
} |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
enum bpf_map_op_type { |
|
BPF_MAP_OP_SET_VALUE, |
|
BPF_MAP_OP_SET_EVSEL, |
|
}; |
|
|
|
enum bpf_map_key_type { |
|
BPF_MAP_KEY_ALL, |
|
BPF_MAP_KEY_RANGES, |
|
}; |
|
|
|
struct bpf_map_op { |
|
struct list_head list; |
|
enum bpf_map_op_type op_type; |
|
enum bpf_map_key_type key_type; |
|
union { |
|
struct parse_events_array array; |
|
} k; |
|
union { |
|
u64 value; |
|
struct evsel *evsel; |
|
} v; |
|
}; |
|
|
|
struct bpf_map_priv { |
|
struct list_head ops_list; |
|
}; |
|
|
|
static void |
|
bpf_map_op__delete(struct bpf_map_op *op) |
|
{ |
|
if (!list_empty(&op->list)) |
|
list_del_init(&op->list); |
|
if (op->key_type == BPF_MAP_KEY_RANGES) |
|
parse_events__clear_array(&op->k.array); |
|
free(op); |
|
} |
|
|
|
static void |
|
bpf_map_priv__purge(struct bpf_map_priv *priv) |
|
{ |
|
struct bpf_map_op *pos, *n; |
|
|
|
list_for_each_entry_safe(pos, n, &priv->ops_list, list) { |
|
list_del_init(&pos->list); |
|
bpf_map_op__delete(pos); |
|
} |
|
} |
|
|
|
static void |
|
bpf_map_priv__clear(struct bpf_map *map __maybe_unused, |
|
void *_priv) |
|
{ |
|
struct bpf_map_priv *priv = _priv; |
|
|
|
bpf_map_priv__purge(priv); |
|
free(priv); |
|
} |
|
|
|
static int |
|
bpf_map_op_setkey(struct bpf_map_op *op, struct parse_events_term *term) |
|
{ |
|
op->key_type = BPF_MAP_KEY_ALL; |
|
if (!term) |
|
return 0; |
|
|
|
if (term->array.nr_ranges) { |
|
size_t memsz = term->array.nr_ranges * |
|
sizeof(op->k.array.ranges[0]); |
|
|
|
op->k.array.ranges = memdup(term->array.ranges, memsz); |
|
if (!op->k.array.ranges) { |
|
pr_debug("Not enough memory to alloc indices for map\n"); |
|
return -ENOMEM; |
|
} |
|
op->key_type = BPF_MAP_KEY_RANGES; |
|
op->k.array.nr_ranges = term->array.nr_ranges; |
|
} |
|
return 0; |
|
} |
|
|
|
static struct bpf_map_op * |
|
bpf_map_op__new(struct parse_events_term *term) |
|
{ |
|
struct bpf_map_op *op; |
|
int err; |
|
|
|
op = zalloc(sizeof(*op)); |
|
if (!op) { |
|
pr_debug("Failed to alloc bpf_map_op\n"); |
|
return ERR_PTR(-ENOMEM); |
|
} |
|
INIT_LIST_HEAD(&op->list); |
|
|
|
err = bpf_map_op_setkey(op, term); |
|
if (err) { |
|
free(op); |
|
return ERR_PTR(err); |
|
} |
|
return op; |
|
} |
|
|
|
static struct bpf_map_op * |
|
bpf_map_op__clone(struct bpf_map_op *op) |
|
{ |
|
struct bpf_map_op *newop; |
|
|
|
newop = memdup(op, sizeof(*op)); |
|
if (!newop) { |
|
pr_debug("Failed to alloc bpf_map_op\n"); |
|
return NULL; |
|
} |
|
|
|
INIT_LIST_HEAD(&newop->list); |
|
if (op->key_type == BPF_MAP_KEY_RANGES) { |
|
size_t memsz = op->k.array.nr_ranges * |
|
sizeof(op->k.array.ranges[0]); |
|
|
|
newop->k.array.ranges = memdup(op->k.array.ranges, memsz); |
|
if (!newop->k.array.ranges) { |
|
pr_debug("Failed to alloc indices for map\n"); |
|
free(newop); |
|
return NULL; |
|
} |
|
} |
|
|
|
return newop; |
|
} |
|
|
|
static struct bpf_map_priv * |
|
bpf_map_priv__clone(struct bpf_map_priv *priv) |
|
{ |
|
struct bpf_map_priv *newpriv; |
|
struct bpf_map_op *pos, *newop; |
|
|
|
newpriv = zalloc(sizeof(*newpriv)); |
|
if (!newpriv) { |
|
pr_debug("Not enough memory to alloc map private\n"); |
|
return NULL; |
|
} |
|
INIT_LIST_HEAD(&newpriv->ops_list); |
|
|
|
list_for_each_entry(pos, &priv->ops_list, list) { |
|
newop = bpf_map_op__clone(pos); |
|
if (!newop) { |
|
bpf_map_priv__purge(newpriv); |
|
return NULL; |
|
} |
|
list_add_tail(&newop->list, &newpriv->ops_list); |
|
} |
|
|
|
return newpriv; |
|
} |
|
|
|
static int |
|
bpf_map__add_op(struct bpf_map *map, struct bpf_map_op *op) |
|
{ |
|
const char *map_name = bpf_map__name(map); |
|
struct bpf_map_priv *priv = bpf_map__priv(map); |
|
|
|
if (IS_ERR(priv)) { |
|
pr_debug("Failed to get private from map %s\n", map_name); |
|
return PTR_ERR(priv); |
|
} |
|
|
|
if (!priv) { |
|
priv = zalloc(sizeof(*priv)); |
|
if (!priv) { |
|
pr_debug("Not enough memory to alloc map private\n"); |
|
return -ENOMEM; |
|
} |
|
INIT_LIST_HEAD(&priv->ops_list); |
|
|
|
if (bpf_map__set_priv(map, priv, bpf_map_priv__clear)) { |
|
free(priv); |
|
return -BPF_LOADER_ERRNO__INTERNAL; |
|
} |
|
} |
|
|
|
list_add_tail(&op->list, &priv->ops_list); |
|
return 0; |
|
} |
|
|
|
static struct bpf_map_op * |
|
bpf_map__add_newop(struct bpf_map *map, struct parse_events_term *term) |
|
{ |
|
struct bpf_map_op *op; |
|
int err; |
|
|
|
op = bpf_map_op__new(term); |
|
if (IS_ERR(op)) |
|
return op; |
|
|
|
err = bpf_map__add_op(map, op); |
|
if (err) { |
|
bpf_map_op__delete(op); |
|
return ERR_PTR(err); |
|
} |
|
return op; |
|
} |
|
|
|
static int |
|
__bpf_map__config_value(struct bpf_map *map, |
|
struct parse_events_term *term) |
|
{ |
|
struct bpf_map_op *op; |
|
const char *map_name = bpf_map__name(map); |
|
const struct bpf_map_def *def = bpf_map__def(map); |
|
|
|
if (IS_ERR(def)) { |
|
pr_debug("Unable to get map definition from '%s'\n", |
|
map_name); |
|
return -BPF_LOADER_ERRNO__INTERNAL; |
|
} |
|
|
|
if (def->type != BPF_MAP_TYPE_ARRAY) { |
|
pr_debug("Map %s type is not BPF_MAP_TYPE_ARRAY\n", |
|
map_name); |
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE; |
|
} |
|
if (def->key_size < sizeof(unsigned int)) { |
|
pr_debug("Map %s has incorrect key size\n", map_name); |
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_KEYSIZE; |
|
} |
|
switch (def->value_size) { |
|
case 1: |
|
case 2: |
|
case 4: |
|
case 8: |
|
break; |
|
default: |
|
pr_debug("Map %s has incorrect value size\n", map_name); |
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE; |
|
} |
|
|
|
op = bpf_map__add_newop(map, term); |
|
if (IS_ERR(op)) |
|
return PTR_ERR(op); |
|
op->op_type = BPF_MAP_OP_SET_VALUE; |
|
op->v.value = term->val.num; |
|
return 0; |
|
} |
|
|
|
static int |
|
bpf_map__config_value(struct bpf_map *map, |
|
struct parse_events_term *term, |
|
struct evlist *evlist __maybe_unused) |
|
{ |
|
if (!term->err_val) { |
|
pr_debug("Config value not set\n"); |
|
return -BPF_LOADER_ERRNO__OBJCONF_CONF; |
|
} |
|
|
|
if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM) { |
|
pr_debug("ERROR: wrong value type for 'value'\n"); |
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE; |
|
} |
|
|
|
return __bpf_map__config_value(map, term); |
|
} |
|
|
|
static int |
|
__bpf_map__config_event(struct bpf_map *map, |
|
struct parse_events_term *term, |
|
struct evlist *evlist) |
|
{ |
|
const struct bpf_map_def *def; |
|
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; |
|
} |
|
|
|
def = bpf_map__def(map); |
|
if (IS_ERR(def)) { |
|
pr_debug("Unable to get map definition from '%s'\n", |
|
map_name); |
|
return PTR_ERR(def); |
|
} |
|
|
|
/* |
|
* No need to check key_size and value_size: |
|
* kernel has already checked them. |
|
*/ |
|
if (def->type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) { |
|
pr_debug("Map %s type is not BPF_MAP_TYPE_PERF_EVENT_ARRAY\n", |
|
map_name); |
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE; |
|
} |
|
|
|
op = bpf_map__add_newop(map, term); |
|
if (IS_ERR(op)) |
|
return PTR_ERR(op); |
|
op->op_type = BPF_MAP_OP_SET_EVSEL; |
|
op->v.evsel = evsel; |
|
return 0; |
|
} |
|
|
|
static int |
|
bpf_map__config_event(struct bpf_map *map, |
|
struct parse_events_term *term, |
|
struct evlist *evlist) |
|
{ |
|
if (!term->err_val) { |
|
pr_debug("Config value not set\n"); |
|
return -BPF_LOADER_ERRNO__OBJCONF_CONF; |
|
} |
|
|
|
if (term->type_val != PARSE_EVENTS__TERM_TYPE_STR) { |
|
pr_debug("ERROR: wrong value type for 'event'\n"); |
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE; |
|
} |
|
|
|
return __bpf_map__config_event(map, term, evlist); |
|
} |
|
|
|
struct bpf_obj_config__map_func { |
|
const char *config_opt; |
|
int (*config_func)(struct bpf_map *, struct parse_events_term *, |
|
struct evlist *); |
|
}; |
|
|
|
struct bpf_obj_config__map_func bpf_obj_config__map_funcs[] = { |
|
{"value", bpf_map__config_value}, |
|
{"event", bpf_map__config_event}, |
|
}; |
|
|
|
static int |
|
config_map_indices_range_check(struct parse_events_term *term, |
|
struct bpf_map *map, |
|
const char *map_name) |
|
{ |
|
struct parse_events_array *array = &term->array; |
|
const struct bpf_map_def *def; |
|
unsigned int i; |
|
|
|
if (!array->nr_ranges) |
|
return 0; |
|
if (!array->ranges) { |
|
pr_debug("ERROR: map %s: array->nr_ranges is %d but range array is NULL\n", |
|
map_name, (int)array->nr_ranges); |
|
return -BPF_LOADER_ERRNO__INTERNAL; |
|
} |
|
|
|
def = bpf_map__def(map); |
|
if (IS_ERR(def)) { |
|
pr_debug("ERROR: Unable to get map definition from '%s'\n", |
|
map_name); |
|
return -BPF_LOADER_ERRNO__INTERNAL; |
|
} |
|
|
|
for (i = 0; i < array->nr_ranges; i++) { |
|
unsigned int start = array->ranges[i].start; |
|
size_t length = array->ranges[i].length; |
|
unsigned int idx = start + length - 1; |
|
|
|
if (idx >= def->max_entries) { |
|
pr_debug("ERROR: index %d too large\n", idx); |
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_IDX2BIG; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
static int |
|
bpf__obj_config_map(struct bpf_object *obj, |
|
struct parse_events_term *term, |
|
struct evlist *evlist, |
|
int *key_scan_pos) |
|
{ |
|
/* key is "map:<mapname>.<config opt>" */ |
|
char *map_name = strdup(term->config + sizeof("map:") - 1); |
|
struct bpf_map *map; |
|
int err = -BPF_LOADER_ERRNO__OBJCONF_OPT; |
|
char *map_opt; |
|
size_t i; |
|
|
|
if (!map_name) |
|
return -ENOMEM; |
|
|
|
map_opt = strchr(map_name, '.'); |
|
if (!map_opt) { |
|
pr_debug("ERROR: Invalid map config: %s\n", map_name); |
|
goto out; |
|
} |
|
|
|
*map_opt++ = '\0'; |
|
if (*map_opt == '\0') { |
|
pr_debug("ERROR: Invalid map option: %s\n", term->config); |
|
goto out; |
|
} |
|
|
|
map = bpf_object__find_map_by_name(obj, map_name); |
|
if (!map) { |
|
pr_debug("ERROR: Map %s doesn't exist\n", map_name); |
|
err = -BPF_LOADER_ERRNO__OBJCONF_MAP_NOTEXIST; |
|
goto out; |
|
} |
|
|
|
*key_scan_pos += strlen(map_opt); |
|
err = config_map_indices_range_check(term, map, map_name); |
|
if (err) |
|
goto out; |
|
*key_scan_pos -= strlen(map_opt); |
|
|
|
for (i = 0; i < ARRAY_SIZE(bpf_obj_config__map_funcs); i++) { |
|
struct bpf_obj_config__map_func *func = |
|
&bpf_obj_config__map_funcs[i]; |
|
|
|
if (strcmp(map_opt, func->config_opt) == 0) { |
|
err = func->config_func(map, term, evlist); |
|
goto out; |
|
} |
|
} |
|
|
|
pr_debug("ERROR: Invalid map config option '%s'\n", map_opt); |
|
err = -BPF_LOADER_ERRNO__OBJCONF_MAP_OPT; |
|
out: |
|
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 evlist *evlist, |
|
int *error_pos) |
|
{ |
|
int key_scan_pos = 0; |
|
int err; |
|
|
|
if (!obj || !term || !term->config) |
|
return -EINVAL; |
|
|
|
if (strstarts(term->config, "map:")) { |
|
key_scan_pos = sizeof("map:") - 1; |
|
err = bpf__obj_config_map(obj, term, evlist, &key_scan_pos); |
|
goto out; |
|
} |
|
err = -BPF_LOADER_ERRNO__OBJCONF_OPT; |
|
out: |
|
if (error_pos) |
|
*error_pos = key_scan_pos; |
|
return err; |
|
|
|
} |
|
|
|
typedef int (*map_config_func_t)(const char *name, int map_fd, |
|
const struct bpf_map_def *pdef, |
|
struct bpf_map_op *op, |
|
void *pkey, void *arg); |
|
|
|
static int |
|
foreach_key_array_all(map_config_func_t func, |
|
void *arg, const char *name, |
|
int map_fd, const struct bpf_map_def *pdef, |
|
struct bpf_map_op *op) |
|
{ |
|
unsigned int i; |
|
int err; |
|
|
|
for (i = 0; i < pdef->max_entries; i++) { |
|
err = func(name, map_fd, pdef, op, &i, arg); |
|
if (err) { |
|
pr_debug("ERROR: failed to insert value to %s[%u]\n", |
|
name, i); |
|
return err; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
static int |
|
foreach_key_array_ranges(map_config_func_t func, void *arg, |
|
const char *name, int map_fd, |
|
const struct bpf_map_def *pdef, |
|
struct bpf_map_op *op) |
|
{ |
|
unsigned int i, j; |
|
int err; |
|
|
|
for (i = 0; i < op->k.array.nr_ranges; i++) { |
|
unsigned int start = op->k.array.ranges[i].start; |
|
size_t length = op->k.array.ranges[i].length; |
|
|
|
for (j = 0; j < length; j++) { |
|
unsigned int idx = start + j; |
|
|
|
err = func(name, map_fd, pdef, op, &idx, arg); |
|
if (err) { |
|
pr_debug("ERROR: failed to insert value to %s[%u]\n", |
|
name, idx); |
|
return err; |
|
} |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
static int |
|
bpf_map_config_foreach_key(struct bpf_map *map, |
|
map_config_func_t func, |
|
void *arg) |
|
{ |
|
int err, map_fd; |
|
struct bpf_map_op *op; |
|
const struct bpf_map_def *def; |
|
const char *name = bpf_map__name(map); |
|
struct bpf_map_priv *priv = bpf_map__priv(map); |
|
|
|
if (IS_ERR(priv)) { |
|
pr_debug("ERROR: failed to get private from map %s\n", name); |
|
return -BPF_LOADER_ERRNO__INTERNAL; |
|
} |
|
if (!priv || list_empty(&priv->ops_list)) { |
|
pr_debug("INFO: nothing to config for map %s\n", name); |
|
return 0; |
|
} |
|
|
|
def = bpf_map__def(map); |
|
if (IS_ERR(def)) { |
|
pr_debug("ERROR: failed to get definition from map %s\n", name); |
|
return -BPF_LOADER_ERRNO__INTERNAL; |
|
} |
|
map_fd = bpf_map__fd(map); |
|
if (map_fd < 0) { |
|
pr_debug("ERROR: failed to get fd from map %s\n", name); |
|
return map_fd; |
|
} |
|
|
|
list_for_each_entry(op, &priv->ops_list, list) { |
|
switch (def->type) { |
|
case BPF_MAP_TYPE_ARRAY: |
|
case BPF_MAP_TYPE_PERF_EVENT_ARRAY: |
|
switch (op->key_type) { |
|
case BPF_MAP_KEY_ALL: |
|
err = foreach_key_array_all(func, arg, name, |
|
map_fd, def, op); |
|
break; |
|
case BPF_MAP_KEY_RANGES: |
|
err = foreach_key_array_ranges(func, arg, name, |
|
map_fd, def, |
|
op); |
|
break; |
|
default: |
|
pr_debug("ERROR: keytype for map '%s' invalid\n", |
|
name); |
|
return -BPF_LOADER_ERRNO__INTERNAL; |
|
} |
|
if (err) |
|
return err; |
|
break; |
|
default: |
|
pr_debug("ERROR: type of '%s' incorrect\n", name); |
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
apply_config_value_for_key(int map_fd, void *pkey, |
|
size_t val_size, u64 val) |
|
{ |
|
int err = 0; |
|
|
|
switch (val_size) { |
|
case 1: { |
|
u8 _val = (u8)(val); |
|
err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY); |
|
break; |
|
} |
|
case 2: { |
|
u16 _val = (u16)(val); |
|
err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY); |
|
break; |
|
} |
|
case 4: { |
|
u32 _val = (u32)(val); |
|
err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY); |
|
break; |
|
} |
|
case 8: { |
|
err = bpf_map_update_elem(map_fd, pkey, &val, BPF_ANY); |
|
break; |
|
} |
|
default: |
|
pr_debug("ERROR: invalid value size\n"); |
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE; |
|
} |
|
if (err && errno) |
|
err = -errno; |
|
return err; |
|
} |
|
|
|
static int |
|
apply_config_evsel_for_key(const char *name, int map_fd, void *pkey, |
|
struct evsel *evsel) |
|
{ |
|
struct xyarray *xy = evsel->core.fd; |
|
struct perf_event_attr *attr; |
|
unsigned int key, events; |
|
bool check_pass = false; |
|
int *evt_fd; |
|
int err; |
|
|
|
if (!xy) { |
|
pr_debug("ERROR: evsel not ready for map %s\n", name); |
|
return -BPF_LOADER_ERRNO__INTERNAL; |
|
} |
|
|
|
if (xy->row_size / xy->entry_size != 1) { |
|
pr_debug("ERROR: Dimension of target event is incorrect for map %s\n", |
|
name); |
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM; |
|
} |
|
|
|
attr = &evsel->core.attr; |
|
if (attr->inherit) { |
|
pr_debug("ERROR: Can't put inherit event into map %s\n", name); |
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH; |
|
} |
|
|
|
if (evsel__is_bpf_output(evsel)) |
|
check_pass = true; |
|
if (attr->type == PERF_TYPE_RAW) |
|
check_pass = true; |
|
if (attr->type == PERF_TYPE_HARDWARE) |
|
check_pass = true; |
|
if (!check_pass) { |
|
pr_debug("ERROR: Event type is wrong for map %s\n", name); |
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE; |
|
} |
|
|
|
events = xy->entries / (xy->row_size / xy->entry_size); |
|
key = *((unsigned int *)pkey); |
|
if (key >= events) { |
|
pr_debug("ERROR: there is no event %d for map %s\n", |
|
key, name); |
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_MAPSIZE; |
|
} |
|
evt_fd = xyarray__entry(xy, key, 0); |
|
err = bpf_map_update_elem(map_fd, pkey, evt_fd, BPF_ANY); |
|
if (err && errno) |
|
err = -errno; |
|
return err; |
|
} |
|
|
|
static int |
|
apply_obj_config_map_for_key(const char *name, int map_fd, |
|
const struct bpf_map_def *pdef, |
|
struct bpf_map_op *op, |
|
void *pkey, void *arg __maybe_unused) |
|
{ |
|
int err; |
|
|
|
switch (op->op_type) { |
|
case BPF_MAP_OP_SET_VALUE: |
|
err = apply_config_value_for_key(map_fd, pkey, |
|
pdef->value_size, |
|
op->v.value); |
|
break; |
|
case BPF_MAP_OP_SET_EVSEL: |
|
err = apply_config_evsel_for_key(name, map_fd, pkey, |
|
op->v.evsel); |
|
break; |
|
default: |
|
pr_debug("ERROR: unknown value type for '%s'\n", name); |
|
err = -BPF_LOADER_ERRNO__INTERNAL; |
|
} |
|
return err; |
|
} |
|
|
|
static int |
|
apply_obj_config_map(struct bpf_map *map) |
|
{ |
|
return bpf_map_config_foreach_key(map, |
|
apply_obj_config_map_for_key, |
|
NULL); |
|
} |
|
|
|
static int |
|
apply_obj_config_object(struct bpf_object *obj) |
|
{ |
|
struct bpf_map *map; |
|
int err; |
|
|
|
bpf_object__for_each_map(map, obj) { |
|
err = apply_obj_config_map(map); |
|
if (err) |
|
return err; |
|
} |
|
return 0; |
|
} |
|
|
|
int bpf__apply_obj_config(void) |
|
{ |
|
struct bpf_object *obj, *tmp; |
|
int err; |
|
|
|
bpf_object__for_each_safe(obj, tmp) { |
|
err = apply_obj_config_object(obj); |
|
if (err) |
|
return err; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
#define bpf__for_each_map(pos, obj, objtmp) \ |
|
bpf_object__for_each_safe(obj, objtmp) \ |
|
bpf_object__for_each_map(pos, obj) |
|
|
|
#define bpf__for_each_map_named(pos, obj, objtmp, name) \ |
|
bpf__for_each_map(pos, obj, objtmp) \ |
|
if (bpf_map__name(pos) && \ |
|
(strcmp(name, \ |
|
bpf_map__name(pos)) == 0)) |
|
|
|
struct evsel *bpf__setup_output_event(struct evlist *evlist, const char *name) |
|
{ |
|
struct bpf_map_priv *tmpl_priv = NULL; |
|
struct bpf_object *obj, *tmp; |
|
struct evsel *evsel = NULL; |
|
struct bpf_map *map; |
|
int err; |
|
bool need_init = false; |
|
|
|
bpf__for_each_map_named(map, obj, tmp, name) { |
|
struct bpf_map_priv *priv = bpf_map__priv(map); |
|
|
|
if (IS_ERR(priv)) |
|
return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL); |
|
|
|
/* |
|
* No need to check map type: type should have been |
|
* verified by kernel. |
|
*/ |
|
if (!need_init && !priv) |
|
need_init = !priv; |
|
if (!tmpl_priv && priv) |
|
tmpl_priv = priv; |
|
} |
|
|
|
if (!need_init) |
|
return NULL; |
|
|
|
if (!tmpl_priv) { |
|
char *event_definition = NULL; |
|
|
|
if (asprintf(&event_definition, "bpf-output/no-inherit=1,name=%s/", name) < 0) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
err = parse_events(evlist, event_definition, NULL); |
|
free(event_definition); |
|
|
|
if (err) { |
|
pr_debug("ERROR: failed to create the \"%s\" bpf-output event\n", name); |
|
return ERR_PTR(-err); |
|
} |
|
|
|
evsel = evlist__last(evlist); |
|
} |
|
|
|
bpf__for_each_map_named(map, obj, tmp, name) { |
|
struct bpf_map_priv *priv = bpf_map__priv(map); |
|
|
|
if (IS_ERR(priv)) |
|
return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL); |
|
if (priv) |
|
continue; |
|
|
|
if (tmpl_priv) { |
|
priv = bpf_map_priv__clone(tmpl_priv); |
|
if (!priv) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
err = bpf_map__set_priv(map, priv, bpf_map_priv__clear); |
|
if (err) { |
|
bpf_map_priv__clear(map, priv); |
|
return ERR_PTR(err); |
|
} |
|
} else if (evsel) { |
|
struct bpf_map_op *op; |
|
|
|
op = bpf_map__add_newop(map, NULL); |
|
if (IS_ERR(op)) |
|
return ERR_CAST(op); |
|
op->op_type = BPF_MAP_OP_SET_EVSEL; |
|
op->v.evsel = evsel; |
|
} |
|
} |
|
|
|
return evsel; |
|
} |
|
|
|
int bpf__setup_stdout(struct evlist *evlist) |
|
{ |
|
struct evsel *evsel = bpf__setup_output_event(evlist, "__bpf_stdout__"); |
|
return PTR_ERR_OR_ZERO(evsel); |
|
} |
|
|
|
#define ERRNO_OFFSET(e) ((e) - __BPF_LOADER_ERRNO__START) |
|
#define ERRCODE_OFFSET(c) ERRNO_OFFSET(BPF_LOADER_ERRNO__##c) |
|
#define NR_ERRNO (__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START) |
|
|
|
static const char *bpf_loader_strerror_table[NR_ERRNO] = { |
|
[ERRCODE_OFFSET(CONFIG)] = "Invalid config string", |
|
[ERRCODE_OFFSET(GROUP)] = "Invalid group name", |
|
[ERRCODE_OFFSET(EVENTNAME)] = "No event name found in config string", |
|
[ERRCODE_OFFSET(INTERNAL)] = "BPF loader internal error", |
|
[ERRCODE_OFFSET(COMPILE)] = "Error when compiling BPF scriptlet", |
|
[ERRCODE_OFFSET(PROGCONF_TERM)] = "Invalid program config term in config string", |
|
[ERRCODE_OFFSET(PROLOGUE)] = "Failed to generate prologue", |
|
[ERRCODE_OFFSET(PROLOGUE2BIG)] = "Prologue too big for program", |
|
[ERRCODE_OFFSET(PROLOGUEOOB)] = "Offset out of bound for prologue", |
|
[ERRCODE_OFFSET(OBJCONF_OPT)] = "Invalid object config option", |
|
[ERRCODE_OFFSET(OBJCONF_CONF)] = "Config value not set (missing '=')", |
|
[ERRCODE_OFFSET(OBJCONF_MAP_OPT)] = "Invalid object map config option", |
|
[ERRCODE_OFFSET(OBJCONF_MAP_NOTEXIST)] = "Target map doesn't exist", |
|
[ERRCODE_OFFSET(OBJCONF_MAP_VALUE)] = "Incorrect value type for map", |
|
[ERRCODE_OFFSET(OBJCONF_MAP_TYPE)] = "Incorrect map type", |
|
[ERRCODE_OFFSET(OBJCONF_MAP_KEYSIZE)] = "Incorrect map key size", |
|
[ERRCODE_OFFSET(OBJCONF_MAP_VALUESIZE)] = "Incorrect map value size", |
|
[ERRCODE_OFFSET(OBJCONF_MAP_NOEVT)] = "Event not found for map setting", |
|
[ERRCODE_OFFSET(OBJCONF_MAP_MAPSIZE)] = "Invalid map size for event setting", |
|
[ERRCODE_OFFSET(OBJCONF_MAP_EVTDIM)] = "Event dimension too large", |
|
[ERRCODE_OFFSET(OBJCONF_MAP_EVTINH)] = "Doesn't support inherit event", |
|
[ERRCODE_OFFSET(OBJCONF_MAP_EVTTYPE)] = "Wrong event type for map", |
|
[ERRCODE_OFFSET(OBJCONF_MAP_IDX2BIG)] = "Index too large", |
|
}; |
|
|
|
static int |
|
bpf_loader_strerror(int err, char *buf, size_t size) |
|
{ |
|
char sbuf[STRERR_BUFSIZE]; |
|
const char *msg; |
|
|
|
if (!buf || !size) |
|
return -1; |
|
|
|
err = err > 0 ? err : -err; |
|
|
|
if (err >= __LIBBPF_ERRNO__START) |
|
return libbpf_strerror(err, buf, size); |
|
|
|
if (err >= __BPF_LOADER_ERRNO__START && err < __BPF_LOADER_ERRNO__END) { |
|
msg = bpf_loader_strerror_table[ERRNO_OFFSET(err)]; |
|
snprintf(buf, size, "%s", msg); |
|
buf[size - 1] = '\0'; |
|
return 0; |
|
} |
|
|
|
if (err >= __BPF_LOADER_ERRNO__END) |
|
snprintf(buf, size, "Unknown bpf loader error %d", err); |
|
else |
|
snprintf(buf, size, "%s", |
|
str_error_r(err, sbuf, sizeof(sbuf))); |
|
|
|
buf[size - 1] = '\0'; |
|
return -1; |
|
} |
|
|
|
#define bpf__strerror_head(err, buf, size) \ |
|
char sbuf[STRERR_BUFSIZE], *emsg;\ |
|
if (!size)\ |
|
return 0;\ |
|
if (err < 0)\ |
|
err = -err;\ |
|
bpf_loader_strerror(err, sbuf, sizeof(sbuf));\ |
|
emsg = sbuf;\ |
|
switch (err) {\ |
|
default:\ |
|
scnprintf(buf, size, "%s", emsg);\ |
|
break; |
|
|
|
#define bpf__strerror_entry(val, fmt...)\ |
|
case val: {\ |
|
scnprintf(buf, size, fmt);\ |
|
break;\ |
|
} |
|
|
|
#define bpf__strerror_end(buf, size)\ |
|
}\ |
|
buf[size - 1] = '\0'; |
|
|
|
int bpf__strerror_prepare_load(const char *filename, bool source, |
|
int err, char *buf, size_t size) |
|
{ |
|
size_t n; |
|
int ret; |
|
|
|
n = snprintf(buf, size, "Failed to load %s%s: ", |
|
filename, source ? " from source" : ""); |
|
if (n >= size) { |
|
buf[size - 1] = '\0'; |
|
return 0; |
|
} |
|
buf += n; |
|
size -= n; |
|
|
|
ret = bpf_loader_strerror(err, buf, size); |
|
buf[size - 1] = '\0'; |
|
return ret; |
|
} |
|
|
|
int bpf__strerror_probe(struct bpf_object *obj __maybe_unused, |
|
int err, char *buf, size_t size) |
|
{ |
|
bpf__strerror_head(err, buf, size); |
|
case BPF_LOADER_ERRNO__PROGCONF_TERM: { |
|
scnprintf(buf, size, "%s (add -v to see detail)", emsg); |
|
break; |
|
} |
|
bpf__strerror_entry(EEXIST, "Probe point exist. Try 'perf probe -d \"*\"' and set 'force=yes'"); |
|
bpf__strerror_entry(EACCES, "You need to be root"); |
|
bpf__strerror_entry(EPERM, "You need to be root, and /proc/sys/kernel/kptr_restrict should be 0"); |
|
bpf__strerror_entry(ENOENT, "You need to check probing points in BPF file"); |
|
bpf__strerror_end(buf, size); |
|
return 0; |
|
} |
|
|
|
int bpf__strerror_load(struct bpf_object *obj, |
|
int err, char *buf, size_t size) |
|
{ |
|
bpf__strerror_head(err, buf, size); |
|
case LIBBPF_ERRNO__KVER: { |
|
unsigned int obj_kver = bpf_object__kversion(obj); |
|
unsigned int real_kver; |
|
|
|
if (fetch_kernel_version(&real_kver, NULL, 0)) { |
|
scnprintf(buf, size, "Unable to fetch kernel version"); |
|
break; |
|
} |
|
|
|
if (obj_kver != real_kver) { |
|
scnprintf(buf, size, |
|
"'version' ("KVER_FMT") doesn't match running kernel ("KVER_FMT")", |
|
KVER_PARAM(obj_kver), |
|
KVER_PARAM(real_kver)); |
|
break; |
|
} |
|
|
|
scnprintf(buf, size, "Failed to load program for unknown reason"); |
|
break; |
|
} |
|
bpf__strerror_end(buf, size); |
|
return 0; |
|
} |
|
|
|
int bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused, |
|
struct parse_events_term *term __maybe_unused, |
|
struct evlist *evlist __maybe_unused, |
|
int *error_pos __maybe_unused, int err, |
|
char *buf, size_t size) |
|
{ |
|
bpf__strerror_head(err, buf, size); |
|
bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE, |
|
"Can't use this config term with this map type"); |
|
bpf__strerror_end(buf, size); |
|
return 0; |
|
} |
|
|
|
int bpf__strerror_apply_obj_config(int err, char *buf, size_t size) |
|
{ |
|
bpf__strerror_head(err, buf, size); |
|
bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM, |
|
"Cannot set event to BPF map in multi-thread tracing"); |
|
bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH, |
|
"%s (Hint: use -i to turn off inherit)", emsg); |
|
bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE, |
|
"Can only put raw, hardware and BPF output event into a BPF map"); |
|
bpf__strerror_end(buf, size); |
|
return 0; |
|
} |
|
|
|
int bpf__strerror_setup_output_event(struct evlist *evlist __maybe_unused, |
|
int err, char *buf, size_t size) |
|
{ |
|
bpf__strerror_head(err, buf, size); |
|
bpf__strerror_end(buf, size); |
|
return 0; |
|
}
|
|
|