From patchwork Wed Mar 22 19:27:51 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Guilherme G. Piccoli" X-Patchwork-Id: 742299 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3vpKcF6Mn9z9ryr for ; Thu, 23 Mar 2017 06:33:49 +1100 (AEDT) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3vpKcF5csBzDqcv for ; Thu, 23 Mar 2017 06:33:49 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3vpKVy45GQzDqbD for ; Thu, 23 Mar 2017 06:29:14 +1100 (AEDT) Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v2MJNpr4193384 for ; Wed, 22 Mar 2017 15:29:12 -0400 Received: from e24smtp02.br.ibm.com (e24smtp02.br.ibm.com [32.104.18.86]) by mx0b-001b2d01.pphosted.com with ESMTP id 29b9vm770g-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Wed, 22 Mar 2017 15:29:12 -0400 Received: from localhost by e24smtp02.br.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 22 Mar 2017 16:29:10 -0300 Received: from d24relay03.br.ibm.com (9.18.232.225) by e24smtp02.br.ibm.com (10.172.0.142) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Wed, 22 Mar 2017 16:29:00 -0300 Received: from d24av05.br.ibm.com (d24av05.br.ibm.com [9.18.232.44]) by d24relay03.br.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v2MJSq4p40435752 for ; Wed, 22 Mar 2017 16:29:00 -0300 Received: from d24av05.br.ibm.com (localhost [127.0.0.1]) by d24av05.br.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v2MJSTbf028722 for ; Wed, 22 Mar 2017 16:28:29 -0300 Received: from localhost ([9.85.206.197]) by d24av05.br.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id v2MJSRtG028468; Wed, 22 Mar 2017 16:28:28 -0300 From: "Guilherme G. Piccoli" To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v4 3/3] powerpc/xmon: add debugfs entry for xmon Date: Wed, 22 Mar 2017 16:27:51 -0300 X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170322192751.30531-1-gpiccoli@linux.vnet.ibm.com> References: <20170322192751.30531-1-gpiccoli@linux.vnet.ibm.com> X-TM-AS-MML: disable x-cbid: 17032219-0020-0000-0000-00000296C0E3 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17032219-0021-0000-0000-000030B2E894 Message-Id: <20170322192751.30531-4-gpiccoli@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-03-22_17:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1702020001 definitions=main-1703220167 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: xinhui.pan@linux.vnet.ibm.com, paulus@samba.org, gpiccoli@linux.vnet.ibm.com Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Currently the xmon debugger is set only via kernel boot command-line. It's disabled by default, and can be enabled with "xmon=on" on the command-line. Also, xmon may be accessed via sysrq mechanism. But we cannot enable/disable xmon in runtime, it needs kernel reload. This patch introduces a debugfs entry for xmon, allowing user to query its current state and change it if desired. Basically, the "xmon" file to read from/write to is under the debugfs mount point, on powerpc directory. It's a simple attribute, value 0 meaning xmon is disabled and value 1 the opposite. Writing these states to the file will take immediate effect in the debugger. Signed-off-by: Guilherme G. Piccoli --- v4: fixed a bug in the patch (s/xmon_off/xmon_on/g basically). v3: logic improved based in the changes made on patch 1. arch/powerpc/xmon/xmon.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index 25a32815f310..0fab9d7349eb 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -29,6 +29,10 @@ #include #include +#ifdef CONFIG_DEBUG_FS +#include +#endif + #include #include #include @@ -3316,6 +3320,33 @@ static int __init setup_xmon_sysrq(void) device_initcall(setup_xmon_sysrq); #endif /* CONFIG_MAGIC_SYSRQ */ +#ifdef CONFIG_DEBUG_FS +static int xmon_dbgfs_set(void *data, u64 val) +{ + xmon_on = !!val; + xmon_init(xmon_on); + + return 0; +} + +static int xmon_dbgfs_get(void *data, u64 *val) +{ + *val = xmon_on; + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(xmon_dbgfs_ops, xmon_dbgfs_get, + xmon_dbgfs_set, "%llu\n"); + +static int __init setup_xmon_dbgfs(void) +{ + debugfs_create_file("xmon", 0600, powerpc_debugfs_root, NULL, + &xmon_dbgfs_ops); + return 0; +} +device_initcall(setup_xmon_dbgfs); +#endif /* CONFIG_DEBUG_FS */ + static int xmon_early __initdata; static int __init early_parse_xmon(char *p)