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![Ian Rogers](/assets/img/avatar_default.png)
Later changes will add reference count checking for struct map, with dso being the most frequently accessed variable. Add an accessor so that the reference count check is only necessary in one place. Additional changes: - add a dso variable to avoid repeated map__dso calls. - in builtin-mem.c dump_raw_samples, code only partially tested for dso == NULL. Make the possibility of NULL consistent. - in thread.c thread__memcpy fix use of spaces and use tabs. Committer notes: Did missing conversions on these files: tools/perf/arch/powerpc/util/skip-callchain-idx.c tools/perf/arch/powerpc/util/sym-handling.c tools/perf/ui/browsers/hists.c tools/perf/ui/gtk/annotate.c tools/perf/util/cs-etm.c tools/perf/util/thread.c tools/perf/util/unwind-libunwind-local.c tools/perf/util/unwind-libunwind.c Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Darren Hart <dvhart@infradead.org> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Dmitriy Vyukov <dvyukov@google.com> Cc: Eric Dumazet <edumazet@google.com> Cc: German Gomez <german.gomez@arm.com> Cc: Hao Luo <haoluo@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Garry <john.g.garry@oracle.com> Cc: Kajol Jain <kjain@linux.ibm.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Miaoqian Lin <linmq006@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Riccardo Mancini <rickyman7@gmail.com> Cc: Shunsuke Nakamura <nakamura.shun@fujitsu.com> Cc: Song Liu <song@kernel.org> Cc: Stephane Eranian <eranian@google.com> Cc: Stephen Brennan <stephen.s.brennan@oracle.com> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Thomas Richter <tmricht@linux.ibm.com> Cc: Yury Norov <yury.norov@gmail.com> Link: https://lore.kernel.org/r/20230320212248.1175731-2-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
585 lines
15 KiB
C
585 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <stdlib.h>
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#include <bpf/bpf.h>
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#include <bpf/btf.h>
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#include <bpf/libbpf.h>
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#include <linux/btf.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#include <internal/lib.h>
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#include <symbol/kallsyms.h>
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#include "bpf-event.h"
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#include "bpf-utils.h"
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#include "debug.h"
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#include "dso.h"
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#include "symbol.h"
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#include "machine.h"
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#include "env.h"
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#include "session.h"
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#include "map.h"
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#include "evlist.h"
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#include "record.h"
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#include "util/synthetic-events.h"
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static int snprintf_hex(char *buf, size_t size, unsigned char *data, size_t len)
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{
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int ret = 0;
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size_t i;
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for (i = 0; i < len; i++)
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ret += snprintf(buf + ret, size - ret, "%02x", data[i]);
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return ret;
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}
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static int machine__process_bpf_event_load(struct machine *machine,
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union perf_event *event,
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struct perf_sample *sample __maybe_unused)
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{
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struct bpf_prog_info_node *info_node;
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struct perf_env *env = machine->env;
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struct perf_bpil *info_linear;
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int id = event->bpf.id;
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unsigned int i;
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/* perf-record, no need to handle bpf-event */
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if (env == NULL)
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return 0;
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info_node = perf_env__find_bpf_prog_info(env, id);
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if (!info_node)
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return 0;
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info_linear = info_node->info_linear;
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for (i = 0; i < info_linear->info.nr_jited_ksyms; i++) {
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u64 *addrs = (u64 *)(uintptr_t)(info_linear->info.jited_ksyms);
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u64 addr = addrs[i];
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struct map *map = maps__find(machine__kernel_maps(machine), addr);
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if (map) {
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struct dso *dso = map__dso(map);
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dso->binary_type = DSO_BINARY_TYPE__BPF_PROG_INFO;
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dso->bpf_prog.id = id;
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dso->bpf_prog.sub_id = i;
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dso->bpf_prog.env = env;
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}
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}
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return 0;
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}
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int machine__process_bpf(struct machine *machine, union perf_event *event,
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struct perf_sample *sample)
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{
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if (dump_trace)
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perf_event__fprintf_bpf(event, stdout);
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switch (event->bpf.type) {
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case PERF_BPF_EVENT_PROG_LOAD:
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return machine__process_bpf_event_load(machine, event, sample);
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case PERF_BPF_EVENT_PROG_UNLOAD:
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/*
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* Do not free bpf_prog_info and btf of the program here,
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* as annotation still need them. They will be freed at
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* the end of the session.
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*/
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break;
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default:
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pr_debug("unexpected bpf event type of %d\n", event->bpf.type);
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break;
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}
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return 0;
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}
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static int perf_env__fetch_btf(struct perf_env *env,
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u32 btf_id,
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struct btf *btf)
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{
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struct btf_node *node;
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u32 data_size;
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const void *data;
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data = btf__raw_data(btf, &data_size);
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node = malloc(data_size + sizeof(struct btf_node));
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if (!node)
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return -1;
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node->id = btf_id;
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node->data_size = data_size;
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memcpy(node->data, data, data_size);
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if (!perf_env__insert_btf(env, node)) {
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/* Insertion failed because of a duplicate. */
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free(node);
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return -1;
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}
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return 0;
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}
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static int synthesize_bpf_prog_name(char *buf, int size,
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struct bpf_prog_info *info,
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struct btf *btf,
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u32 sub_id)
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{
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u8 (*prog_tags)[BPF_TAG_SIZE] = (void *)(uintptr_t)(info->prog_tags);
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void *func_infos = (void *)(uintptr_t)(info->func_info);
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u32 sub_prog_cnt = info->nr_jited_ksyms;
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const struct bpf_func_info *finfo;
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const char *short_name = NULL;
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const struct btf_type *t;
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int name_len;
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name_len = snprintf(buf, size, "bpf_prog_");
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name_len += snprintf_hex(buf + name_len, size - name_len,
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prog_tags[sub_id], BPF_TAG_SIZE);
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if (btf) {
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finfo = func_infos + sub_id * info->func_info_rec_size;
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t = btf__type_by_id(btf, finfo->type_id);
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short_name = btf__name_by_offset(btf, t->name_off);
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} else if (sub_id == 0 && sub_prog_cnt == 1) {
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/* no subprog */
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if (info->name[0])
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short_name = info->name;
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} else
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short_name = "F";
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if (short_name)
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name_len += snprintf(buf + name_len, size - name_len,
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"_%s", short_name);
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return name_len;
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}
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/*
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* Synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for one bpf
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* program. One PERF_RECORD_BPF_EVENT is generated for the program. And
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* one PERF_RECORD_KSYMBOL is generated for each sub program.
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*
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* Returns:
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* 0 for success;
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* -1 for failures;
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* -2 for lack of kernel support.
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*/
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static int perf_event__synthesize_one_bpf_prog(struct perf_session *session,
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perf_event__handler_t process,
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struct machine *machine,
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int fd,
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union perf_event *event,
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struct record_opts *opts)
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{
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struct perf_record_ksymbol *ksymbol_event = &event->ksymbol;
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struct perf_record_bpf_event *bpf_event = &event->bpf;
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struct perf_tool *tool = session->tool;
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struct bpf_prog_info_node *info_node;
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struct perf_bpil *info_linear;
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struct bpf_prog_info *info;
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struct btf *btf = NULL;
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struct perf_env *env;
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u32 sub_prog_cnt, i;
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int err = 0;
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u64 arrays;
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/*
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* for perf-record and perf-report use header.env;
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* otherwise, use global perf_env.
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*/
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env = session->data ? &session->header.env : &perf_env;
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arrays = 1UL << PERF_BPIL_JITED_KSYMS;
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arrays |= 1UL << PERF_BPIL_JITED_FUNC_LENS;
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arrays |= 1UL << PERF_BPIL_FUNC_INFO;
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arrays |= 1UL << PERF_BPIL_PROG_TAGS;
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arrays |= 1UL << PERF_BPIL_JITED_INSNS;
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arrays |= 1UL << PERF_BPIL_LINE_INFO;
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arrays |= 1UL << PERF_BPIL_JITED_LINE_INFO;
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info_linear = get_bpf_prog_info_linear(fd, arrays);
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if (IS_ERR_OR_NULL(info_linear)) {
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info_linear = NULL;
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pr_debug("%s: failed to get BPF program info. aborting\n", __func__);
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return -1;
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}
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if (info_linear->info_len < offsetof(struct bpf_prog_info, prog_tags)) {
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free(info_linear);
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pr_debug("%s: the kernel is too old, aborting\n", __func__);
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return -2;
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}
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info = &info_linear->info;
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if (!info->jited_ksyms) {
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free(info_linear);
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return -1;
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}
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/* number of ksyms, func_lengths, and tags should match */
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sub_prog_cnt = info->nr_jited_ksyms;
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if (sub_prog_cnt != info->nr_prog_tags ||
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sub_prog_cnt != info->nr_jited_func_lens) {
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free(info_linear);
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return -1;
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}
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/* check BTF func info support */
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if (info->btf_id && info->nr_func_info && info->func_info_rec_size) {
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/* btf func info number should be same as sub_prog_cnt */
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if (sub_prog_cnt != info->nr_func_info) {
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pr_debug("%s: mismatch in BPF sub program count and BTF function info count, aborting\n", __func__);
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free(info_linear);
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return -1;
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}
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btf = btf__load_from_kernel_by_id(info->btf_id);
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if (libbpf_get_error(btf)) {
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pr_debug("%s: failed to get BTF of id %u, aborting\n", __func__, info->btf_id);
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err = -1;
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goto out;
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}
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perf_env__fetch_btf(env, info->btf_id, btf);
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}
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/* Synthesize PERF_RECORD_KSYMBOL */
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for (i = 0; i < sub_prog_cnt; i++) {
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__u32 *prog_lens = (__u32 *)(uintptr_t)(info->jited_func_lens);
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__u64 *prog_addrs = (__u64 *)(uintptr_t)(info->jited_ksyms);
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int name_len;
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*ksymbol_event = (struct perf_record_ksymbol) {
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.header = {
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.type = PERF_RECORD_KSYMBOL,
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.size = offsetof(struct perf_record_ksymbol, name),
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},
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.addr = prog_addrs[i],
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.len = prog_lens[i],
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.ksym_type = PERF_RECORD_KSYMBOL_TYPE_BPF,
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.flags = 0,
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};
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name_len = synthesize_bpf_prog_name(ksymbol_event->name,
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KSYM_NAME_LEN, info, btf, i);
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ksymbol_event->header.size += PERF_ALIGN(name_len + 1,
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sizeof(u64));
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memset((void *)event + event->header.size, 0, machine->id_hdr_size);
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event->header.size += machine->id_hdr_size;
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err = perf_tool__process_synth_event(tool, event,
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machine, process);
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}
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if (!opts->no_bpf_event) {
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/* Synthesize PERF_RECORD_BPF_EVENT */
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*bpf_event = (struct perf_record_bpf_event) {
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.header = {
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.type = PERF_RECORD_BPF_EVENT,
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.size = sizeof(struct perf_record_bpf_event),
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},
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.type = PERF_BPF_EVENT_PROG_LOAD,
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.flags = 0,
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.id = info->id,
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};
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memcpy(bpf_event->tag, info->tag, BPF_TAG_SIZE);
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memset((void *)event + event->header.size, 0, machine->id_hdr_size);
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event->header.size += machine->id_hdr_size;
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/* save bpf_prog_info to env */
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info_node = malloc(sizeof(struct bpf_prog_info_node));
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if (!info_node) {
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err = -1;
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goto out;
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}
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info_node->info_linear = info_linear;
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perf_env__insert_bpf_prog_info(env, info_node);
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info_linear = NULL;
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/*
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* process after saving bpf_prog_info to env, so that
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* required information is ready for look up
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*/
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err = perf_tool__process_synth_event(tool, event,
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machine, process);
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}
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out:
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free(info_linear);
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btf__free(btf);
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return err ? -1 : 0;
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}
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struct kallsyms_parse {
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union perf_event *event;
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perf_event__handler_t process;
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struct machine *machine;
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struct perf_tool *tool;
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};
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static int
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process_bpf_image(char *name, u64 addr, struct kallsyms_parse *data)
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{
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struct machine *machine = data->machine;
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union perf_event *event = data->event;
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struct perf_record_ksymbol *ksymbol;
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int len;
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ksymbol = &event->ksymbol;
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*ksymbol = (struct perf_record_ksymbol) {
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.header = {
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.type = PERF_RECORD_KSYMBOL,
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.size = offsetof(struct perf_record_ksymbol, name),
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},
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.addr = addr,
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.len = page_size,
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.ksym_type = PERF_RECORD_KSYMBOL_TYPE_BPF,
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.flags = 0,
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};
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len = scnprintf(ksymbol->name, KSYM_NAME_LEN, "%s", name);
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ksymbol->header.size += PERF_ALIGN(len + 1, sizeof(u64));
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memset((void *) event + event->header.size, 0, machine->id_hdr_size);
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event->header.size += machine->id_hdr_size;
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return perf_tool__process_synth_event(data->tool, event, machine,
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data->process);
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}
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static int
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kallsyms_process_symbol(void *data, const char *_name,
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char type __maybe_unused, u64 start)
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{
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char disp[KSYM_NAME_LEN];
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char *module, *name;
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unsigned long id;
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int err = 0;
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module = strchr(_name, '\t');
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if (!module)
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return 0;
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/* We are going after [bpf] module ... */
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if (strcmp(module + 1, "[bpf]"))
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return 0;
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name = memdup(_name, (module - _name) + 1);
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if (!name)
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return -ENOMEM;
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name[module - _name] = 0;
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/* .. and only for trampolines and dispatchers */
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if ((sscanf(name, "bpf_trampoline_%lu", &id) == 1) ||
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(sscanf(name, "bpf_dispatcher_%s", disp) == 1))
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err = process_bpf_image(name, start, data);
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free(name);
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return err;
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}
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int perf_event__synthesize_bpf_events(struct perf_session *session,
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perf_event__handler_t process,
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struct machine *machine,
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struct record_opts *opts)
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{
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const char *kallsyms_filename = "/proc/kallsyms";
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struct kallsyms_parse arg;
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union perf_event *event;
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__u32 id = 0;
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int err;
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int fd;
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event = malloc(sizeof(event->bpf) + KSYM_NAME_LEN + machine->id_hdr_size);
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if (!event)
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return -1;
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/* Synthesize all the bpf programs in system. */
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while (true) {
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err = bpf_prog_get_next_id(id, &id);
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if (err) {
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if (errno == ENOENT) {
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err = 0;
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break;
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}
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pr_debug("%s: can't get next program: %s%s\n",
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__func__, strerror(errno),
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errno == EINVAL ? " -- kernel too old?" : "");
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/* don't report error on old kernel or EPERM */
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err = (errno == EINVAL || errno == EPERM) ? 0 : -1;
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break;
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}
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fd = bpf_prog_get_fd_by_id(id);
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if (fd < 0) {
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pr_debug("%s: failed to get fd for prog_id %u\n",
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__func__, id);
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continue;
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}
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err = perf_event__synthesize_one_bpf_prog(session, process,
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machine, fd,
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event, opts);
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close(fd);
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if (err) {
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/* do not return error for old kernel */
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if (err == -2)
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err = 0;
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break;
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}
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}
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/* Synthesize all the bpf images - trampolines/dispatchers. */
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if (symbol_conf.kallsyms_name != NULL)
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kallsyms_filename = symbol_conf.kallsyms_name;
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arg = (struct kallsyms_parse) {
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.event = event,
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.process = process,
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.machine = machine,
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.tool = session->tool,
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};
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if (kallsyms__parse(kallsyms_filename, &arg, kallsyms_process_symbol)) {
|
|
pr_err("%s: failed to synthesize bpf images: %s\n",
|
|
__func__, strerror(errno));
|
|
}
|
|
|
|
free(event);
|
|
return err;
|
|
}
|
|
|
|
static void perf_env__add_bpf_info(struct perf_env *env, u32 id)
|
|
{
|
|
struct bpf_prog_info_node *info_node;
|
|
struct perf_bpil *info_linear;
|
|
struct btf *btf = NULL;
|
|
u64 arrays;
|
|
u32 btf_id;
|
|
int fd;
|
|
|
|
fd = bpf_prog_get_fd_by_id(id);
|
|
if (fd < 0)
|
|
return;
|
|
|
|
arrays = 1UL << PERF_BPIL_JITED_KSYMS;
|
|
arrays |= 1UL << PERF_BPIL_JITED_FUNC_LENS;
|
|
arrays |= 1UL << PERF_BPIL_FUNC_INFO;
|
|
arrays |= 1UL << PERF_BPIL_PROG_TAGS;
|
|
arrays |= 1UL << PERF_BPIL_JITED_INSNS;
|
|
arrays |= 1UL << PERF_BPIL_LINE_INFO;
|
|
arrays |= 1UL << PERF_BPIL_JITED_LINE_INFO;
|
|
|
|
info_linear = get_bpf_prog_info_linear(fd, arrays);
|
|
if (IS_ERR_OR_NULL(info_linear)) {
|
|
pr_debug("%s: failed to get BPF program info. aborting\n", __func__);
|
|
goto out;
|
|
}
|
|
|
|
btf_id = info_linear->info.btf_id;
|
|
|
|
info_node = malloc(sizeof(struct bpf_prog_info_node));
|
|
if (info_node) {
|
|
info_node->info_linear = info_linear;
|
|
perf_env__insert_bpf_prog_info(env, info_node);
|
|
} else
|
|
free(info_linear);
|
|
|
|
if (btf_id == 0)
|
|
goto out;
|
|
|
|
btf = btf__load_from_kernel_by_id(btf_id);
|
|
if (libbpf_get_error(btf)) {
|
|
pr_debug("%s: failed to get BTF of id %u, aborting\n",
|
|
__func__, btf_id);
|
|
goto out;
|
|
}
|
|
perf_env__fetch_btf(env, btf_id, btf);
|
|
|
|
out:
|
|
btf__free(btf);
|
|
close(fd);
|
|
}
|
|
|
|
static int bpf_event__sb_cb(union perf_event *event, void *data)
|
|
{
|
|
struct perf_env *env = data;
|
|
|
|
if (event->header.type != PERF_RECORD_BPF_EVENT)
|
|
return -1;
|
|
|
|
switch (event->bpf.type) {
|
|
case PERF_BPF_EVENT_PROG_LOAD:
|
|
perf_env__add_bpf_info(env, event->bpf.id);
|
|
|
|
case PERF_BPF_EVENT_PROG_UNLOAD:
|
|
/*
|
|
* Do not free bpf_prog_info and btf of the program here,
|
|
* as annotation still need them. They will be freed at
|
|
* the end of the session.
|
|
*/
|
|
break;
|
|
default:
|
|
pr_debug("unexpected bpf event type of %d\n", event->bpf.type);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int evlist__add_bpf_sb_event(struct evlist *evlist, struct perf_env *env)
|
|
{
|
|
struct perf_event_attr attr = {
|
|
.type = PERF_TYPE_SOFTWARE,
|
|
.config = PERF_COUNT_SW_DUMMY,
|
|
.sample_id_all = 1,
|
|
.watermark = 1,
|
|
.bpf_event = 1,
|
|
.size = sizeof(attr), /* to capture ABI version */
|
|
};
|
|
|
|
/*
|
|
* Older gcc versions don't support designated initializers, like above,
|
|
* for unnamed union members, such as the following:
|
|
*/
|
|
attr.wakeup_watermark = 1;
|
|
|
|
return evlist__add_sb_event(evlist, &attr, bpf_event__sb_cb, env);
|
|
}
|
|
|
|
void bpf_event__print_bpf_prog_info(struct bpf_prog_info *info,
|
|
struct perf_env *env,
|
|
FILE *fp)
|
|
{
|
|
__u32 *prog_lens = (__u32 *)(uintptr_t)(info->jited_func_lens);
|
|
__u64 *prog_addrs = (__u64 *)(uintptr_t)(info->jited_ksyms);
|
|
char name[KSYM_NAME_LEN];
|
|
struct btf *btf = NULL;
|
|
u32 sub_prog_cnt, i;
|
|
|
|
sub_prog_cnt = info->nr_jited_ksyms;
|
|
if (sub_prog_cnt != info->nr_prog_tags ||
|
|
sub_prog_cnt != info->nr_jited_func_lens)
|
|
return;
|
|
|
|
if (info->btf_id) {
|
|
struct btf_node *node;
|
|
|
|
node = perf_env__find_btf(env, info->btf_id);
|
|
if (node)
|
|
btf = btf__new((__u8 *)(node->data),
|
|
node->data_size);
|
|
}
|
|
|
|
if (sub_prog_cnt == 1) {
|
|
synthesize_bpf_prog_name(name, KSYM_NAME_LEN, info, btf, 0);
|
|
fprintf(fp, "# bpf_prog_info %u: %s addr 0x%llx size %u\n",
|
|
info->id, name, prog_addrs[0], prog_lens[0]);
|
|
goto out;
|
|
}
|
|
|
|
fprintf(fp, "# bpf_prog_info %u:\n", info->id);
|
|
for (i = 0; i < sub_prog_cnt; i++) {
|
|
synthesize_bpf_prog_name(name, KSYM_NAME_LEN, info, btf, i);
|
|
|
|
fprintf(fp, "# \tsub_prog %u: %s addr 0x%llx size %u\n",
|
|
i, name, prog_addrs[i], prog_lens[i]);
|
|
}
|
|
out:
|
|
btf__free(btf);
|
|
}
|