Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932762AbbLHC1Q (ORCPT ); Mon, 7 Dec 2015 21:27:16 -0500 Received: from szxga01-in.huawei.com ([58.251.152.64]:42655 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755647AbbLHC0Z (ORCPT ); Mon, 7 Dec 2015 21:26:25 -0500 From: Wang Nan To: , CC: , , , , Wang Nan , He Kuang , Alexei Starovoitov , "Arnaldo Carvalho de Melo" , Masami Hiramatsu Subject: [PATCH v4 04/16] perf tools: Enable BPF object configure syntax Date: Tue, 8 Dec 2015 02:25:32 +0000 Message-ID: <1449541544-67621-5-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1449541544-67621-1-git-send-email-wangnan0@huawei.com> References: <1449541544-67621-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090204.56663FC0.0007,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 9764c8e3ad5bf3e56cf47579a023402f Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8727 Lines: 290 This patch adds the final step for BPF map configuration. A new syntax is appended into parser so user can config BPF objects through '/' '/' enclosed config terms. After this patch, following syntax is available: # perf record -e bpf_file.c/maps:mymap:value=123/ ... It would takes effect after appling following commits. Test result: # cat ./test_bpf_map_1.c /************************ BEGIN **************************/ #define SEC(NAME) __attribute__((section(NAME), used)) enum bpf_map_type { BPF_MAP_TYPE_ARRAY = 2, }; struct bpf_map_def { unsigned int type; unsigned int key_size; unsigned int value_size; unsigned int max_entries; }; static void *(*map_lookup_elem)(struct bpf_map_def *, void *) = (void *)1; static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) = (void *)6; struct bpf_map_def SEC("maps") channel = { .type = BPF_MAP_TYPE_ARRAY, .key_size = sizeof(int), .value_size = sizeof(int), .max_entries = 1, }; SEC("func=sys_nanosleep") int func(void *ctx) { int key = 0; char fmt[] = "%d\n"; int *pval = map_lookup_elem(&channel, &key); if (!pval) return 0; bpf_trace_printk(fmt, sizeof(fmt), *pval); return 0; } char _license[] SEC("license") = "GPL"; int _version SEC("version") = LINUX_VERSION_CODE; /************************* END ***************************/ - Normal case: # ./perf record -e './test_bpf_map_1.c/maps:channel.value=10/' usleep 10 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.012 MB perf.data ] - Error case: # ./perf record -e './test_bpf_map_1.c/maps:channel.value/' usleep 10 event syntax error: '..ps:channel:value/' \___ Config value not set (lost '=') Hint: Valid config term: maps:[]:value=[value] (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 # ./perf record -e './test_bpf_map_1.c/xmaps:channel.value=10/' usleep 10 event syntax error: '..pf_map_1.c/xmaps:channel.value=10/' \___ Invalid object config option [SNIP] # ./perf record -e './test_bpf_map_1.c/maps:xchannel.value=10/' usleep 10 event syntax error: '..p_1.c/maps:xchannel.value=10/' \___ Target map not exist [SNIP] # ./perf record -e './test_bpf_map_1.c/maps:channel.xvalue=10/' usleep 10 event syntax error: '..ps:channel.xvalue=10/' \___ Invalid object maps config option [SNIP] # ./perf record -e './test_bpf_map_1.c/maps:channel.value=x10/' usleep 10 event syntax error: '..nnel.value=x10/' \___ Incorrect value type for map [SNIP] Change BPF_MAP_TYPE_ARRAY = 2 tp BPF_MAP_TYPE_ARRAY = 1: # ./perf record -e './test_bpf_map_1.c/maps:channel.value=10/' usleep 10 event syntax error: '..ps:channel.value=10/' \___ Can't use this config term to this type of map Hint: Valid config term: maps:[].value=[value] (add -v to see detail) Signed-off-by: Wang Nan Signed-off-by: He Kuang Cc: Alexei Starovoitov Cc: Arnaldo Carvalho de Melo Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Zefan Li Cc: pi3orama@163.com --- tools/perf/util/parse-events.c | 56 +++++++++++++++++++++++++++++++++++++++--- tools/perf/util/parse-events.h | 3 ++- tools/perf/util/parse-events.l | 2 +- tools/perf/util/parse-events.y | 23 ++++++++++++++--- 4 files changed, 75 insertions(+), 9 deletions(-) diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 6fc8cd7..95775fe 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -628,17 +628,64 @@ errout: return err; } +static int +parse_events_config_bpf(struct parse_events_evlist *data, + struct bpf_object *obj, + struct list_head *head_config) +{ + struct parse_events_term *term; + int error_pos; + + if (!head_config || list_empty(head_config)) + return 0; + + list_for_each_entry(term, head_config, list) { + char errbuf[BUFSIZ]; + int err; + + if (term->type_term != PARSE_EVENTS__TERM_TYPE_USER) { + snprintf(errbuf, sizeof(errbuf), + "Invalid config term for BPF object"); + errbuf[BUFSIZ - 1] = '\0'; + + data->error->idx = term->err_term; + data->error->str = strdup(errbuf); + return -EINVAL; + } + + err = bpf__config_obj(obj, term, NULL, &error_pos); + if (err) { + bpf__strerror_config_obj(obj, term, NULL, + &error_pos, err, errbuf, + sizeof(errbuf)); + data->error->help = strdup( +"Hint:\tValid config term:\n" +" \tmaps:[].value=[value]\n" +" \t(add -v to see detail)"); + data->error->str = strdup(errbuf); + if (err == -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE) + data->error->idx = term->err_val; + else + data->error->idx = term->err_term + error_pos; + return err; + } + } + return 0; + +} + int parse_events_load_bpf(struct parse_events_evlist *data, struct list_head *list, char *bpf_file_name, - bool source) + bool source, + struct list_head *head_config) { struct bpf_object *obj; + int err; obj = bpf__prepare_load(bpf_file_name, source); if (IS_ERR(obj)) { char errbuf[BUFSIZ]; - int err; err = PTR_ERR(obj); @@ -656,7 +703,10 @@ int parse_events_load_bpf(struct parse_events_evlist *data, return err; } - return parse_events_load_bpf_obj(data, list, obj); + err = parse_events_load_bpf_obj(data, list, obj); + if (err) + return err; + return parse_events_config_bpf(data, obj, head_config); } static int diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index f1a6db1..84694f3 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -126,7 +126,8 @@ int parse_events_add_tracepoint(struct list_head *list, int *idx, int parse_events_load_bpf(struct parse_events_evlist *data, struct list_head *list, char *bpf_file_name, - bool source); + bool source, + struct list_head *head_config); /* Provide this function for perf test */ struct bpf_object; int parse_events_load_bpf_obj(struct parse_events_evlist *data, diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l index 58c5831..4387728 100644 --- a/tools/perf/util/parse-events.l +++ b/tools/perf/util/parse-events.l @@ -122,7 +122,7 @@ num_dec [0-9]+ num_hex 0x[a-fA-F0-9]+ num_raw_hex [a-fA-F0-9]+ name [a-zA-Z_*?][a-zA-Z0-9_*?.]* -name_minus [a-zA-Z_*?][a-zA-Z0-9\-_*?.]* +name_minus [a-zA-Z_*?][a-zA-Z0-9\-_*?.:]* /* If you add a modifier you need to update check_modifier() */ modifier_event [ukhpPGHSDI]+ modifier_bp [rwx]{1,3} diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index ad37996..8992d16 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -64,6 +64,7 @@ static inc_group_count(struct list_head *list, %type PE_PMU_EVENT_PRE PE_PMU_EVENT_SUF PE_KERNEL_PMU_EVENT %type value_sym %type event_config +%type event_bpf_config %type event_term %type event_pmu %type event_legacy_symbol @@ -455,27 +456,41 @@ PE_RAW } event_bpf_file: -PE_BPF_OBJECT +PE_BPF_OBJECT event_bpf_config { 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, false)); + ABORT_ON(parse_events_load_bpf(data, list, $1, false, $2)); + if ($2) + parse_events__free_terms($2); $$ = list; } | -PE_BPF_SOURCE +PE_BPF_SOURCE event_bpf_config { struct parse_events_evlist *data = _data; struct list_head *list; ALLOC_LIST(list); - ABORT_ON(parse_events_load_bpf(data, list, $1, true)); + ABORT_ON(parse_events_load_bpf(data, list, $1, true, $2)); + if ($2) + parse_events__free_terms($2); $$ = list; } +event_bpf_config: +'/' event_config '/' +{ + $$ = $2; +} +| +{ + $$ = NULL; +} + start_terms: event_config { struct parse_events_terms *data = _data; -- 1.8.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/