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[209.132.180.67]) by mx.google.com with ESMTP id q3si64785886pap.6.2015.10.08.01.41.33; Thu, 08 Oct 2015 01:41:33 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754669AbbJHIlX (ORCPT + 30 others); Thu, 8 Oct 2015 04:41:23 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:49635 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754087AbbJHIcD (ORCPT ); Thu, 8 Oct 2015 04:32:03 -0400 Received: from 172.24.1.47 (EHLO szxeml427-hub.china.huawei.com) ([172.24.1.47]) by szxrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CTW15976; Thu, 08 Oct 2015 16:29:44 +0800 (CST) Received: from linux-4hy3.site (10.107.193.248) by szxeml427-hub.china.huawei.com (10.82.67.182) with Microsoft SMTP Server id 14.3.235.1; Thu, 8 Oct 2015 16:29:26 +0800 From: Wang Nan To: CC: , , , Wang Nan , Alexei Starovoitov , Brendan Gregg , Daniel Borkmann , David Ahern , He Kuang , Jiri Olsa , Kaixu Xia , Masami Hiramatsu , Namhyung Kim , Peter Zijlstra Subject: [PATCH 03/22] perf tools: Enable passing bpf object file to --event Date: Thu, 8 Oct 2015 08:29:25 +0000 Message-ID: <1444292984-13135-4-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1444292984-13135-1-git-send-email-wangnan0@huawei.com> References: <1444292984-13135-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: list List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: wangnan0@huawei.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.217.169 as permitted sender) smtp.mailfrom=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , 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. Signed-off-by: Wang Nan Cc: Alexei Starovoitov Cc: Arnaldo Carvalho de Melo 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/n/ebpf-6yw9eg0ej3l4jnqhinngkw86@git.kernel.org --- 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 5437134..3d4c7c0 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 9217119..591b3fe 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 991bbd4..a02abd3 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 f13d3cc..fbb16c7 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -121,6 +121,14 @@ 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 be24457..5e5d31a 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); @@ -264,6 +266,7 @@ 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 ae6af26..497f19b 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;