From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12EECC282CE for ; Wed, 5 Jun 2019 00:42:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DFA63206DF for ; Wed, 5 Jun 2019 00:42:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="kfIIvFE0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726663AbfFEAmv (ORCPT ); Tue, 4 Jun 2019 20:42:51 -0400 Received: from aserp2130.oracle.com ([141.146.126.79]:34276 "EHLO aserp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726638AbfFEAmv (ORCPT ); Tue, 4 Jun 2019 20:42:51 -0400 Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x550YvN1181842; Wed, 5 Jun 2019 00:42:21 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2018-07-02; bh=pKcVDYej571iUEZ1fuxZmn8sto91jp1Lw9EvBVj8DHg=; b=kfIIvFE0l/cnN2gXMZJU1y9gTn026TyIvi9+/9GZPKjGHdQe/x3JP4ScsiS8i358AFDz Ej1lUhvyTxFkYnGzWbiyNts6LYwA77ojcbTspId27dq5/S7OwzngAqiAtzwerSoqH0IX q+M8tGFfPxG//ZyS+19RmnfPPHlh4hQbNU76LHWEluZaSwNpQ58ToR+1ZKoQB77x2ofg JZCrCT1QJnX/TF/LDuhC6HmPd8lR1H6pR2JWTcZg0Qr/urukEekDpnUCjRR8NH1WyI+E FbRFtajX47GS2DZleelPoi98RxQu4+ayALOByJLV3nV1FoUpPTnNl7zFpNDYKPviGnGO TA== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2130.oracle.com with ESMTP id 2suevdgb2u-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 05 Jun 2019 00:42:21 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x550eqmn085940; Wed, 5 Jun 2019 00:42:20 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 2swngkn3rg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 05 Jun 2019 00:42:20 +0000 Received: from abhmp0008.oracle.com (abhmp0008.oracle.com [141.146.116.14]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x550gJYk028699; Wed, 5 Jun 2019 00:42:19 GMT Received: from ca-common-hq.us.oracle.com (/10.211.9.209) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 04 Jun 2019 17:42:19 -0700 From: Divya Indi To: linux-kernel@vger.kernel.org Cc: Srinivas Eeda , Steven Rostedt , Divya Indi Subject: [PATCH 3/3] tracing: Add 2 new funcs. for kernel access to Ftrace instances. Date: Tue, 4 Jun 2019 17:42:05 -0700 Message-Id: <1559695325-17155-4-git-send-email-divya.indi@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1559695325-17155-3-git-send-email-divya.indi@oracle.com> References: <1559695325-17155-1-git-send-email-divya.indi@oracle.com> <1559695325-17155-2-git-send-email-divya.indi@oracle.com> <1559695325-17155-3-git-send-email-divya.indi@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9278 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906050001 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9278 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906050001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Adding 2 new functions - 1) trace_array_lookup : Look up and return a trace array, given its name. 2) trace_array_set_clr_event : Enable/disable event recording to the given trace array. Signed-off-by: Divya Indi --- include/linux/trace_events.h | 3 +++ kernel/trace/trace.c | 11 +++++++++++ kernel/trace/trace_events.c | 22 ++++++++++++++++++++++ 3 files changed, 36 insertions(+) diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h index d7b7d85..0cc99a8 100644 --- a/include/linux/trace_events.h +++ b/include/linux/trace_events.h @@ -545,7 +545,10 @@ int trace_array_printk(struct trace_array *tr, unsigned long ip, struct trace_array *trace_array_create(const char *name); int trace_array_destroy(struct trace_array *tr); int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set); +struct trace_array *trace_array_lookup(const char *name); int trace_set_clr_event(const char *system, const char *event, int set); +int trace_array_set_clr_event(struct trace_array *tr, const char *system, + const char *event, int set); /* * The double __builtin_constant_p is because gcc will give us an error diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index a60dc13..1d171fd 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -8465,6 +8465,17 @@ static int instance_rmdir(const char *name) return ret; } +struct trace_array *trace_array_lookup(const char *name) +{ + struct trace_array *tr; + list_for_each_entry(tr, &ftrace_trace_arrays, list) { + if (tr->name && strcmp(tr->name, name) == 0) + return tr; + } + return NULL; +} +EXPORT_SYMBOL_GPL(trace_array_lookup); + static __init void create_trace_instances(struct dentry *d_tracer) { trace_instance_dir = tracefs_create_instance_dir("instances", d_tracer, diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 445b059..c126d2c 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -859,6 +859,28 @@ int trace_set_clr_event(const char *system, const char *event, int set) } EXPORT_SYMBOL_GPL(trace_set_clr_event); +/** + * trace_array_set_clr_event - enable or disable an event for a trace array + * @system: system name to match (NULL for any system) + * @event: event name to match (NULL for all events, within system) + * @set: 1 to enable, 0 to disable + * + * This is a way for other parts of the kernel to enable or disable + * event recording to instances. + * + * Returns 0 on success, -EINVAL if the parameters do not match any + * registered events. + */ +int trace_array_set_clr_event(struct trace_array *tr, const char *system, + const char *event, int set) +{ + if (!tr) + return -ENODEV; + + return __ftrace_set_clr_event(tr, NULL, system, event, set); +} +EXPORT_SYMBOL_GPL(trace_array_set_clr_event); + /* 128 should be much more than enough */ #define EVENT_BUF_SIZE 127 -- 1.8.3.1