Commit-ID: 9b86d04d53b98399017fea44e9047165ffe12d42 Gitweb: https://git.kernel.org/tip/9b86d04d53b98399017fea44e9047165ffe12d42 Author: Song Liu <songliubrav...@fb.com> AuthorDate: Mon, 11 Mar 2019 22:30:48 -0700 Committer: Arnaldo Carvalho de Melo <a...@redhat.com> CommitDate: Tue, 19 Mar 2019 16:52:07 -0300
perf symbols: Introduce DSO_BINARY_TYPE__BPF_PROG_INFO Introduce a new dso type DSO_BINARY_TYPE__BPF_PROG_INFO for BPF programs. In symbol__disassemble(), DSO_BINARY_TYPE__BPF_PROG_INFO dso will call into a new function symbol__disassemble_bpf() in an upcoming patch, where annotation line information is filled based bpf_prog_info and btf saved in given perf_env. Committer notes: Removed the unnamed union with 'bpf_prog' and 'cache' in 'struct dso', to fix this bug when exiting 'perf top': # perf top perf: Segmentation fault -------- backtrace -------- perf[0x5a785a] /lib64/libc.so.6(+0x385bf)[0x7fd68443c5bf] perf(rb_first+0x2b)[0x4d6eeb] perf(dso__delete+0xb7)[0x4dffb7] perf[0x4f9e37] perf(perf_session__delete+0x64)[0x504df4] perf(cmd_top+0x1957)[0x454467] perf[0x4aad18] perf(main+0x61c)[0x42ec7c] /lib64/libc.so.6(__libc_start_main+0xf2)[0x7fd684428412] perf(_start+0x2d)[0x42eead] # # addr2line -fe ~/bin/perf 0x4dffb7 dso_cache__free /home/acme/git/perf/tools/perf/util/dso.c:713 That is trying to access the dso->data.cache, and that is not used with BPF programs, so we end up accessing what is in bpf_prog.first_member, b00m. Signed-off-by: Song Liu <songliubrav...@fb.com> Reviewed-by: Jiri Olsa <jo...@kernel.org> Cc: Alexei Starovoitov <a...@kernel.org> Cc: Daniel Borkmann <dan...@iogearbox.net> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Stanislav Fomichev <s...@google.com> Cc: kernel-t...@fb.com Link: http://lkml.kernel.org/r/20190312053051.2690567-13-songliubrav...@fb.com [ split from a larger patch ] Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- tools/perf/util/dso.c | 1 + tools/perf/util/dso.h | 8 ++++++++ tools/perf/util/symbol.c | 1 + 3 files changed, 10 insertions(+) diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c index ab8a455d2283..e059976d9d93 100644 --- a/tools/perf/util/dso.c +++ b/tools/perf/util/dso.c @@ -184,6 +184,7 @@ int dso__read_binary_type_filename(const struct dso *dso, case DSO_BINARY_TYPE__KALLSYMS: case DSO_BINARY_TYPE__GUEST_KALLSYMS: case DSO_BINARY_TYPE__JAVA_JIT: + case DSO_BINARY_TYPE__BPF_PROG_INFO: case DSO_BINARY_TYPE__NOT_FOUND: ret = -1; break; diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h index bb417c54c25a..6e3f63781e51 100644 --- a/tools/perf/util/dso.h +++ b/tools/perf/util/dso.h @@ -14,6 +14,7 @@ struct machine; struct map; +struct perf_env; enum dso_binary_type { DSO_BINARY_TYPE__KALLSYMS = 0, @@ -35,6 +36,7 @@ enum dso_binary_type { DSO_BINARY_TYPE__KCORE, DSO_BINARY_TYPE__GUEST_KCORE, DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO, + DSO_BINARY_TYPE__BPF_PROG_INFO, DSO_BINARY_TYPE__NOT_FOUND, }; @@ -189,6 +191,12 @@ struct dso { u64 debug_frame_offset; u64 eh_frame_hdr_offset; } data; + /* bpf prog information */ + struct { + u32 id; + u32 sub_id; + struct perf_env *env; + } bpf_prog; union { /* Tool specific area */ void *priv; diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 58442ca5e3c4..5cbad55cd99d 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -1455,6 +1455,7 @@ static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod, case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO: return true; + case DSO_BINARY_TYPE__BPF_PROG_INFO: case DSO_BINARY_TYPE__NOT_FOUND: default: return false;
