From 84c86ca12b2189df751eed7b2d67cb63bc8feda5 Mon Sep 17 00:00:00 2001 From: Wang Nan Date: Wed, 14 Oct 2015 12:41:14 +0000 Subject: [PATCH] perf tools: Enable passing bpf object file to --event By introducing new rules in tools/perf/util/parse-events.[ly], this patch enables 'perf record --event bpf_file.o' to select events by an eBPF object file. It calls parse_events_load_bpf() to load that file, which uses bpf__prepare_load() and finally calls bpf_object__open() for the object files. After applying this patch, commands like: # perf record --event foo.o sleep become possible. However, at this point it is unable to link any useful things onto the evsel list because the creating of probe points and BPF program attaching have not been implemented. Before real events are possible to be extracted, to avoid perf report error because of empty evsel list, this patch link a dummy evsel. The dummy event related code will be removed when probing and extracting code is ready. Commiter notes: Using it: $ ls -la foo.o ls: cannot access foo.o: No such file or directory $ perf record --event foo.o sleep libbpf: failed to open foo.o: No such file or directory event syntax error: 'foo.o' \___ BPF object file 'foo.o' is invalid (add -v to see detail) Run 'perf list' for a list of valid events Usage: perf record [] [] or: perf record [] -- [] -e, --event event selector. use 'perf list' to list available events $ $ file /tmp/build/perf/perf.o /tmp/build/perf/perf.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped $ perf record --event /tmp/build/perf/perf.o sleep libbpf: /tmp/build/perf/perf.o is not an eBPF object file event syntax error: '/tmp/build/perf/perf.o' \___ BPF object file '/tmp/build/perf/perf.o' is invalid (add -v to see detail) Run 'perf list' for a list of valid events Usage: perf record [] [] or: perf record [] -- [] -e, --event event selector. use 'perf list' to list available events $ $ file /tmp/foo.o /tmp/foo.o: ELF 64-bit LSB relocatable, no machine, version 1 (SYSV), not stripped $ perf record --event /tmp/foo.o sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.013 MB perf.data ] $ perf evlist /tmp/foo.o $ perf evlist -v /tmp/foo.o: type: 1, size: 112, config: 0x9, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|PERIOD, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1 $ So, type 1 is PERF_TYPE_SOFTWARE, config 0x9 is PERF_COUNT_SW_DUMMY, ok. $ perf report --stdio Error: The perf.data file has no samples! # To display the perf.data header info, please use --header/--header-only options. # $ Signed-off-by: Wang Nan Tested-by: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: Brendan Gregg Cc: Daniel Borkmann Cc: David Ahern Cc: He Kuang Cc: Jiri Olsa Cc: Kaixu Xia Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1444826502-49291-4-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/perf.c | 2 ++ tools/perf/util/Build | 1 + tools/perf/util/parse-events.c | 57 ++++++++++++++++++++++++++++++++++ tools/perf/util/parse-events.h | 8 +++++ tools/perf/util/parse-events.l | 3 ++ tools/perf/util/parse-events.y | 18 ++++++++++- 6 files changed, 88 insertions(+), 1 deletion(-) diff --git a/tools/perf/perf.c b/tools/perf/perf.c index 543713422d14..3d4c7c09adea 100644 --- a/tools/perf/perf.c +++ b/tools/perf/perf.c @@ -15,6 +15,7 @@ #include "util/run-command.h" #include "util/parse-events.h" #include "util/parse-options.h" +#include "util/bpf-loader.h" #include "util/debug.h" #include #include @@ -385,6 +386,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv) status = p->fn(argc, argv, prefix); exit_browser(status); perf_env__exit(&perf_env); + bpf__clear(); if (status) return status & 0xff; diff --git a/tools/perf/util/Build b/tools/perf/util/Build index 9217119c4108..591b3fe3ed49 100644 --- a/tools/perf/util/Build +++ b/tools/perf/util/Build @@ -87,6 +87,7 @@ libperf-$(CONFIG_AUXTRACE) += intel-bts.o libperf-y += parse-branch-options.o libperf-y += parse-regs-options.o +libperf-$(CONFIG_LIBBPF) += bpf-loader.o libperf-$(CONFIG_LIBELF) += symbol-elf.o libperf-$(CONFIG_LIBELF) += probe-file.o libperf-$(CONFIG_LIBELF) += probe-event.o diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 72abcf254ccb..a9e1d79d17d7 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -11,6 +11,7 @@ #include "symbol.h" #include "cache.h" #include "header.h" +#include "bpf-loader.h" #include "debug.h" #include #include "parse-events-bison.h" @@ -529,6 +530,62 @@ static int add_tracepoint_multi_sys(struct list_head *list, int *idx, return ret; } +int parse_events_load_bpf_obj(struct parse_events_evlist *data, + struct list_head *list, + struct bpf_object *obj) +{ + int err; + char errbuf[BUFSIZ]; + + if (IS_ERR(obj) || !obj) { + snprintf(errbuf, sizeof(errbuf), + "Internal error: load bpf obj with NULL"); + err = -EINVAL; + goto errout; + } + + /* + * Temporary add a dummy event here so we can check whether + * basic bpf loader works. Following patches will replace + * dummy event by useful evsels. + */ + return parse_events_add_numeric(data, list, PERF_TYPE_SOFTWARE, + PERF_COUNT_SW_DUMMY, NULL); +errout: + data->error->help = strdup("(add -v to see detail)"); + data->error->str = strdup(errbuf); + return err; +} + +int parse_events_load_bpf(struct parse_events_evlist *data, + struct list_head *list, + char *bpf_file_name) +{ + struct bpf_object *obj; + + obj = bpf__prepare_load(bpf_file_name); + if (IS_ERR(obj) || !obj) { + char errbuf[BUFSIZ]; + int err; + + err = obj ? PTR_ERR(obj) : -EINVAL; + + if (err == -ENOTSUP) + snprintf(errbuf, sizeof(errbuf), + "BPF support is not compiled"); + else + snprintf(errbuf, sizeof(errbuf), + "BPF object file '%s' is invalid", + bpf_file_name); + + data->error->help = strdup("(add -v to see detail)"); + data->error->str = strdup(errbuf); + return err; + } + + return parse_events_load_bpf_obj(data, list, obj); +} + static int parse_breakpoint_type(const char *type, struct perf_event_attr *attr) { diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index 13c9063513eb..765018a17448 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -123,6 +123,14 @@ int parse_events_add_tracepoint(struct list_head *list, int *idx, char *sys, char *event, struct parse_events_error *error, struct list_head *head_config); +int parse_events_load_bpf(struct parse_events_evlist *data, + struct list_head *list, + char *bpf_file_name); +/* Provide this function for perf test */ +struct bpf_object; +int parse_events_load_bpf_obj(struct parse_events_evlist *data, + struct list_head *list, + struct bpf_object *obj); int parse_events_add_numeric(struct parse_events_evlist *data, struct list_head *list, u32 type, u64 config, diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l index 8d0de5b2991d..cf330ebf812c 100644 --- a/tools/perf/util/parse-events.l +++ b/tools/perf/util/parse-events.l @@ -115,6 +115,7 @@ do { \ group [^,{}/]*[{][^}]*[}][^,{}/]* event_pmu [^,{}/]+[/][^/]*[/][^,{}/]* event [^,{}/]+ +bpf_object .*\.(o|bpf) num_dec [0-9]+ num_hex 0x[a-fA-F0-9]+ @@ -159,6 +160,7 @@ modifier_bp [rwx]{1,3} } {event_pmu} | +{bpf_object} | {event} { BEGIN(INITIAL); REWIND(1); @@ -266,6 +268,7 @@ r{num_raw_hex} { return raw(yyscanner); } {num_hex} { return value(yyscanner, 16); } {modifier_event} { return str(yyscanner, PE_MODIFIER_EVENT); } +{bpf_object} { return str(yyscanner, PE_BPF_OBJECT); } {name} { return pmu_str_check(yyscanner); } "/" { BEGIN(config); return '/'; } - { return '-'; } diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index ae6af269f9c9..497f19b20f0b 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -42,6 +42,7 @@ static inc_group_count(struct list_head *list, %token PE_VALUE PE_VALUE_SYM_HW PE_VALUE_SYM_SW PE_RAW PE_TERM %token PE_EVENT_NAME %token PE_NAME +%token PE_BPF_OBJECT %token PE_MODIFIER_EVENT PE_MODIFIER_BP %token PE_NAME_CACHE_TYPE PE_NAME_CACHE_OP_RESULT %token PE_PREFIX_MEM PE_PREFIX_RAW PE_PREFIX_GROUP @@ -53,6 +54,7 @@ static inc_group_count(struct list_head *list, %type PE_RAW %type PE_TERM %type PE_NAME +%type PE_BPF_OBJECT %type PE_NAME_CACHE_TYPE %type PE_NAME_CACHE_OP_RESULT %type PE_MODIFIER_EVENT @@ -70,6 +72,7 @@ static inc_group_count(struct list_head *list, %type tracepoint_name %type event_legacy_numeric %type event_legacy_raw +%type event_bpf_file %type event_def %type event_mod %type event_name @@ -203,7 +206,8 @@ event_def: event_pmu | event_legacy_mem | event_legacy_tracepoint sep_dc | event_legacy_numeric sep_dc | - event_legacy_raw sep_dc + event_legacy_raw sep_dc | + event_bpf_file event_pmu: PE_NAME '/' event_config '/' @@ -449,6 +453,18 @@ PE_RAW $$ = list; } +event_bpf_file: +PE_BPF_OBJECT +{ + struct parse_events_evlist *data = _data; + struct parse_events_error *error = data->error; + struct list_head *list; + + ALLOC_LIST(list); + ABORT_ON(parse_events_load_bpf(data, list, $1)); + $$ = list; +} + start_terms: event_config { struct parse_events_terms *data = _data;