From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753545AbbGIMhN (ORCPT ); Thu, 9 Jul 2015 08:37:13 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:58449 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753445AbbGIMgf (ORCPT ); Thu, 9 Jul 2015 08:36:35 -0400 From: Wang Nan To: , CC: , , , , Subject: [PATCH 39/39] perf tools: Support attach BPF program on uprobe events Date: Thu, 9 Jul 2015 12:35:42 +0000 Message-ID: <1436445342-1402-40-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1436445342-1402-1-git-send-email-wangnan0@huawei.com> References: <1436445342-1402-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.197.200] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch appends new syntax to BPF object section name to support probing at uprobe event. Now we can use BPF program like this: SEC( "target=/lib64/libc.so.6\n" "libcwrite=__write" ) int libcwrite(void *ctx) { return 1; } Where, in section name of a program, before the main config string, we can use 'key=value' style options. Now the only option key "target" is for uprobe probing. Signed-off-by: Wang Nan --- tools/perf/util/bpf-loader.c | 88 ++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 81 insertions(+), 7 deletions(-) diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c index 0a4e9ec..f5b2344 100644 --- a/tools/perf/util/bpf-loader.c +++ b/tools/perf/util/bpf-loader.c @@ -75,6 +75,84 @@ bpf_prog_priv__clear(struct bpf_program *prog __maybe_unused, } static int +do_config(const char *key, const char *value, + struct perf_probe_event *pev) +{ + pr_debug("config bpf program: %s=%s\n", key, value); + if (strcmp(key, "target") == 0) { + pev->uprobes = true; + pev->target = strdup(value); + return 0; + } + + pr_warning("BPF: WARNING: invalid config option in object: %s=%s\n", + key, value); + pr_warning("\tHint: Currently only valid option is 'target='\n"); + return 0; +} + +static const char * +parse_config_kvpair(const char *config_str, struct perf_probe_event *pev) +{ + char *text = strdup(config_str); + char *sep, *line; + const char *main_str = NULL; + int err = 0; + + if (!text) { + pr_err("No enough memory: dup config_str failed\n"); + return NULL; + } + + line = text; + while ((sep = strchr(line, '\n'))) { + char *equ; + + *sep = '\0'; + equ = strchr(line, '='); + if (!equ) { + pr_warning("WARNING: invalid config in BPF object: %s\n", + line); + pr_warning("\tShould be 'key=value'.\n"); + goto nextline; + } + *equ = '\0'; + + err = do_config(line, equ + 1, pev); + if (err) + break; +nextline: + line = sep + 1; + } + + if (!err) + main_str = config_str + (line - text); + free(text); + + return main_str; +} + +static int +parse_config(const char *config_str, struct perf_probe_event *pev) +{ + const char *main_str; + int err; + + main_str = parse_config_kvpair(config_str, pev); + if (!main_str) + return -EINVAL; + + err = parse_perf_probe_command(main_str, pev); + if (err < 0) { + pr_err("bpf: '%s' is not a valid config string\n", + config_str); + /* parse failed, don't need clear pev. */ + return -EINVAL; + } + return 0; +} + +static int config_bpf_program(struct bpf_program *prog) { struct perf_probe_event *pev = alloc_perf_probe_event(); @@ -93,13 +171,9 @@ config_bpf_program(struct bpf_program *prog) } pr_debug("bpf: config program '%s'\n", config_str); - err = parse_perf_probe_command(config_str, pev); - if (err < 0) { - pr_err("bpf: '%s' is not a valid config string\n", - config_str); - /* parse failed, don't need clear pev. */ - return -EINVAL; - } + err = parse_config(config_str, pev); + if (err) + return err; if (pev->group && strcmp(pev->group, PERF_BPF_PROBE_GROUP)) { pr_err("bpf: '%s': group for event is set and not '%s'.\n", -- 1.8.3.4