1 // SPDX-License-Identifier: GPL-2.0
6 #include <bpf/libbpf.h>
18 #define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr))
20 static int snprintf_hex(char *buf, size_t size, unsigned char *data, size_t len)
25 for (i = 0; i < len; i++)
26 ret += snprintf(buf + ret, size - ret, "%02x", data[i]);
30 static int machine__process_bpf_event_load(struct machine *machine,
31 union perf_event *event,
32 struct perf_sample *sample __maybe_unused)
34 struct bpf_prog_info_linear *info_linear;
35 struct bpf_prog_info_node *info_node;
36 struct perf_env *env = machine->env;
37 int id = event->bpf_event.id;
40 /* perf-record, no need to handle bpf-event */
44 info_node = perf_env__find_bpf_prog_info(env, id);
47 info_linear = info_node->info_linear;
49 for (i = 0; i < info_linear->info.nr_jited_ksyms; i++) {
50 u64 *addrs = (u64 *)(uintptr_t)(info_linear->info.jited_ksyms);
54 map = map_groups__find(&machine->kmaps, addr);
57 map->dso->binary_type = DSO_BINARY_TYPE__BPF_PROG_INFO;
58 map->dso->bpf_prog.id = id;
59 map->dso->bpf_prog.sub_id = i;
60 map->dso->bpf_prog.env = env;
66 int machine__process_bpf_event(struct machine *machine __maybe_unused,
67 union perf_event *event,
68 struct perf_sample *sample __maybe_unused)
71 perf_event__fprintf_bpf_event(event, stdout);
73 switch (event->bpf_event.type) {
74 case PERF_BPF_EVENT_PROG_LOAD:
75 return machine__process_bpf_event_load(machine, event, sample);
77 case PERF_BPF_EVENT_PROG_UNLOAD:
79 * Do not free bpf_prog_info and btf of the program here,
80 * as annotation still need them. They will be freed at
81 * the end of the session.
85 pr_debug("unexpected bpf_event type of %d\n",
86 event->bpf_event.type);
92 static int perf_env__fetch_btf(struct perf_env *env,
96 struct btf_node *node;
100 data = btf__get_raw_data(btf, &data_size);
102 node = malloc(data_size + sizeof(struct btf_node));
107 node->data_size = data_size;
108 memcpy(node->data, data, data_size);
110 perf_env__insert_btf(env, node);
114 static int synthesize_bpf_prog_name(char *buf, int size,
115 struct bpf_prog_info *info,
119 u8 (*prog_tags)[BPF_TAG_SIZE] = (void *)(uintptr_t)(info->prog_tags);
120 void *func_infos = (void *)(uintptr_t)(info->func_info);
121 u32 sub_prog_cnt = info->nr_jited_ksyms;
122 const struct bpf_func_info *finfo;
123 const char *short_name = NULL;
124 const struct btf_type *t;
127 name_len = snprintf(buf, size, "bpf_prog_");
128 name_len += snprintf_hex(buf + name_len, size - name_len,
129 prog_tags[sub_id], BPF_TAG_SIZE);
131 finfo = func_infos + sub_id * info->func_info_rec_size;
132 t = btf__type_by_id(btf, finfo->type_id);
133 short_name = btf__name_by_offset(btf, t->name_off);
134 } else if (sub_id == 0 && sub_prog_cnt == 1) {
137 short_name = info->name;
141 name_len += snprintf(buf + name_len, size - name_len,
147 * Synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for one bpf
148 * program. One PERF_RECORD_BPF_EVENT is generated for the program. And
149 * one PERF_RECORD_KSYMBOL is generated for each sub program.
154 * -2 for lack of kernel support.
156 static int perf_event__synthesize_one_bpf_prog(struct perf_session *session,
157 perf_event__handler_t process,
158 struct machine *machine,
160 union perf_event *event,
161 struct record_opts *opts)
163 struct ksymbol_event *ksymbol_event = &event->ksymbol_event;
164 struct bpf_event *bpf_event = &event->bpf_event;
165 struct bpf_prog_info_linear *info_linear;
166 struct perf_tool *tool = session->tool;
167 struct bpf_prog_info_node *info_node;
168 struct bpf_prog_info *info;
169 struct btf *btf = NULL;
170 struct perf_env *env;
176 * for perf-record and perf-report use header.env;
177 * otherwise, use global perf_env.
179 env = session->data ? &session->header.env : &perf_env;
181 arrays = 1UL << BPF_PROG_INFO_JITED_KSYMS;
182 arrays |= 1UL << BPF_PROG_INFO_JITED_FUNC_LENS;
183 arrays |= 1UL << BPF_PROG_INFO_FUNC_INFO;
184 arrays |= 1UL << BPF_PROG_INFO_PROG_TAGS;
185 arrays |= 1UL << BPF_PROG_INFO_JITED_INSNS;
186 arrays |= 1UL << BPF_PROG_INFO_LINE_INFO;
187 arrays |= 1UL << BPF_PROG_INFO_JITED_LINE_INFO;
189 info_linear = bpf_program__get_prog_info_linear(fd, arrays);
190 if (IS_ERR_OR_NULL(info_linear)) {
192 pr_debug("%s: failed to get BPF program info. aborting\n", __func__);
196 if (info_linear->info_len < offsetof(struct bpf_prog_info, prog_tags)) {
197 pr_debug("%s: the kernel is too old, aborting\n", __func__);
201 info = &info_linear->info;
203 /* number of ksyms, func_lengths, and tags should match */
204 sub_prog_cnt = info->nr_jited_ksyms;
205 if (sub_prog_cnt != info->nr_prog_tags ||
206 sub_prog_cnt != info->nr_jited_func_lens)
209 /* check BTF func info support */
210 if (info->btf_id && info->nr_func_info && info->func_info_rec_size) {
211 /* btf func info number should be same as sub_prog_cnt */
212 if (sub_prog_cnt != info->nr_func_info) {
213 pr_debug("%s: mismatch in BPF sub program count and BTF function info count, aborting\n", __func__);
217 if (btf__get_from_id(info->btf_id, &btf)) {
218 pr_debug("%s: failed to get BTF of id %u, aborting\n", __func__, info->btf_id);
223 perf_env__fetch_btf(env, info->btf_id, btf);
226 /* Synthesize PERF_RECORD_KSYMBOL */
227 for (i = 0; i < sub_prog_cnt; i++) {
228 __u32 *prog_lens = (__u32 *)(uintptr_t)(info->jited_func_lens);
229 __u64 *prog_addrs = (__u64 *)(uintptr_t)(info->jited_ksyms);
232 *ksymbol_event = (struct ksymbol_event){
234 .type = PERF_RECORD_KSYMBOL,
235 .size = offsetof(struct ksymbol_event, name),
237 .addr = prog_addrs[i],
239 .ksym_type = PERF_RECORD_KSYMBOL_TYPE_BPF,
243 name_len = synthesize_bpf_prog_name(ksymbol_event->name,
244 KSYM_NAME_LEN, info, btf, i);
245 ksymbol_event->header.size += PERF_ALIGN(name_len + 1,
248 memset((void *)event + event->header.size, 0, machine->id_hdr_size);
249 event->header.size += machine->id_hdr_size;
250 err = perf_tool__process_synth_event(tool, event,
254 if (!opts->no_bpf_event) {
255 /* Synthesize PERF_RECORD_BPF_EVENT */
256 *bpf_event = (struct bpf_event){
258 .type = PERF_RECORD_BPF_EVENT,
259 .size = sizeof(struct bpf_event),
261 .type = PERF_BPF_EVENT_PROG_LOAD,
265 memcpy(bpf_event->tag, info->tag, BPF_TAG_SIZE);
266 memset((void *)event + event->header.size, 0, machine->id_hdr_size);
267 event->header.size += machine->id_hdr_size;
269 /* save bpf_prog_info to env */
270 info_node = malloc(sizeof(struct bpf_prog_info_node));
276 info_node->info_linear = info_linear;
277 perf_env__insert_bpf_prog_info(env, info_node);
281 * process after saving bpf_prog_info to env, so that
282 * required information is ready for look up
284 err = perf_tool__process_synth_event(tool, event,
294 int perf_event__synthesize_bpf_events(struct perf_session *session,
295 perf_event__handler_t process,
296 struct machine *machine,
297 struct record_opts *opts)
299 union perf_event *event;
304 event = malloc(sizeof(event->bpf_event) + KSYM_NAME_LEN + machine->id_hdr_size);
308 err = bpf_prog_get_next_id(id, &id);
310 if (errno == ENOENT) {
314 pr_debug("%s: can't get next program: %s%s\n",
315 __func__, strerror(errno),
316 errno == EINVAL ? " -- kernel too old?" : "");
317 /* don't report error on old kernel or EPERM */
318 err = (errno == EINVAL || errno == EPERM) ? 0 : -1;
321 fd = bpf_prog_get_fd_by_id(id);
323 pr_debug("%s: failed to get fd for prog_id %u\n",
328 err = perf_event__synthesize_one_bpf_prog(session, process,
333 /* do not return error for old kernel */
343 static void perf_env__add_bpf_info(struct perf_env *env, u32 id)
345 struct bpf_prog_info_linear *info_linear;
346 struct bpf_prog_info_node *info_node;
347 struct btf *btf = NULL;
352 fd = bpf_prog_get_fd_by_id(id);
356 arrays = 1UL << BPF_PROG_INFO_JITED_KSYMS;
357 arrays |= 1UL << BPF_PROG_INFO_JITED_FUNC_LENS;
358 arrays |= 1UL << BPF_PROG_INFO_FUNC_INFO;
359 arrays |= 1UL << BPF_PROG_INFO_PROG_TAGS;
360 arrays |= 1UL << BPF_PROG_INFO_JITED_INSNS;
361 arrays |= 1UL << BPF_PROG_INFO_LINE_INFO;
362 arrays |= 1UL << BPF_PROG_INFO_JITED_LINE_INFO;
364 info_linear = bpf_program__get_prog_info_linear(fd, arrays);
365 if (IS_ERR_OR_NULL(info_linear)) {
366 pr_debug("%s: failed to get BPF program info. aborting\n", __func__);
370 btf_id = info_linear->info.btf_id;
372 info_node = malloc(sizeof(struct bpf_prog_info_node));
374 info_node->info_linear = info_linear;
375 perf_env__insert_bpf_prog_info(env, info_node);
382 if (btf__get_from_id(btf_id, &btf)) {
383 pr_debug("%s: failed to get BTF of id %u, aborting\n",
387 perf_env__fetch_btf(env, btf_id, btf);
394 static int bpf_event__sb_cb(union perf_event *event, void *data)
396 struct perf_env *env = data;
398 if (event->header.type != PERF_RECORD_BPF_EVENT)
401 switch (event->bpf_event.type) {
402 case PERF_BPF_EVENT_PROG_LOAD:
403 perf_env__add_bpf_info(env, event->bpf_event.id);
405 case PERF_BPF_EVENT_PROG_UNLOAD:
407 * Do not free bpf_prog_info and btf of the program here,
408 * as annotation still need them. They will be freed at
409 * the end of the session.
413 pr_debug("unexpected bpf_event type of %d\n",
414 event->bpf_event.type);
421 int bpf_event__add_sb_event(struct perf_evlist **evlist,
422 struct perf_env *env)
424 struct perf_event_attr attr = {
425 .type = PERF_TYPE_SOFTWARE,
426 .config = PERF_COUNT_SW_DUMMY,
430 .size = sizeof(attr), /* to capture ABI version */
434 * Older gcc versions don't support designated initializers, like above,
435 * for unnamed union members, such as the following:
437 attr.wakeup_watermark = 1;
439 return perf_evlist__add_sb_event(evlist, &attr, bpf_event__sb_cb, env);
442 void bpf_event__print_bpf_prog_info(struct bpf_prog_info *info,
443 struct perf_env *env,
446 __u32 *prog_lens = (__u32 *)(uintptr_t)(info->jited_func_lens);
447 __u64 *prog_addrs = (__u64 *)(uintptr_t)(info->jited_ksyms);
448 char name[KSYM_NAME_LEN];
449 struct btf *btf = NULL;
452 sub_prog_cnt = info->nr_jited_ksyms;
453 if (sub_prog_cnt != info->nr_prog_tags ||
454 sub_prog_cnt != info->nr_jited_func_lens)
458 struct btf_node *node;
460 node = perf_env__find_btf(env, info->btf_id);
462 btf = btf__new((__u8 *)(node->data),
466 if (sub_prog_cnt == 1) {
467 synthesize_bpf_prog_name(name, KSYM_NAME_LEN, info, btf, 0);
468 fprintf(fp, "# bpf_prog_info %u: %s addr 0x%llx size %u\n",
469 info->id, name, prog_addrs[0], prog_lens[0]);
473 fprintf(fp, "# bpf_prog_info %u:\n", info->id);
474 for (i = 0; i < sub_prog_cnt; i++) {
475 synthesize_bpf_prog_name(name, KSYM_NAME_LEN, info, btf, i);
477 fprintf(fp, "# \tsub_prog %u: %s addr 0x%llx size %u\n",
478 i, name, prog_addrs[i], prog_lens[i]);