From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: 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 3vMDPv74wyzDq5W for ; Mon, 13 Feb 2017 16:19:47 +1100 (AEDT) Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v1D5JMDo118855 for ; Mon, 13 Feb 2017 00:19:45 -0500 Received: from e23smtp04.au.ibm.com (e23smtp04.au.ibm.com [202.81.31.146]) by mx0a-001b2d01.pphosted.com with ESMTP id 28hyg1pq8m-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 13 Feb 2017 00:19:45 -0500 Received: from localhost by e23smtp04.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 13 Feb 2017 15:19:42 +1000 Received: from d23relay08.au.ibm.com (d23relay08.au.ibm.com [9.185.71.33]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id 3D96E3578052 for ; Mon, 13 Feb 2017 16:19:40 +1100 (EST) Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay08.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v1D5JWw329294830 for ; Mon, 13 Feb 2017 16:19:40 +1100 Received: from d23av03.au.ibm.com (localhost [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v1D5J7GY002070 for ; Mon, 13 Feb 2017 16:19:08 +1100 From: Pan Xinhui To: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, aneesh.kumar@linux.vnet.ibm.com, Pan Xinhui Subject: [PATCH] powerpc/xmon: add turn off xmon option Date: Mon, 13 Feb 2017 05:13:52 -0500 Message-Id: <1486980832-6846-1-git-send-email-xinhui.pan@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Once xmon is triggered, there is no interface to turn it off again. However there exists disable/enable xmon code flows. And more important, System reset interrupt on powerVM will fire an oops to make a dump. At that time, xmon should not be triggered. So add 'z' option after current 'x|X' exit commands. Turn xmon off if 'z' is following. Signed-off-by: Pan Xinhui --- arch/powerpc/xmon/xmon.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index 9c0e17c..2f4e7b1 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -76,6 +76,7 @@ static int xmon_gate; #endif /* CONFIG_SMP */ static unsigned long in_xmon __read_mostly = 0; +static int xmon_off = 0; static unsigned long adrs; static int size = 1; @@ -255,8 +256,8 @@ Commands:\n\ Sr # read SPR #\n\ Sw #v write v to SPR #\n\ t print backtrace\n\ - x exit monitor and recover\n\ - X exit monitor and don't recover\n" + x[z] exit monitor and recover, turn off xmon with 'z'\n\ + X[z] exit monitor and don't recover, turn off xmon with 'z'\n" #if defined(CONFIG_PPC64) && !defined(CONFIG_PPC_BOOK3E) " u dump segment table or SLB\n" #elif defined(CONFIG_PPC_STD_MMU_32) @@ -952,6 +953,8 @@ cmds(struct pt_regs *excp) break; case 'x': case 'X': + if (inchar() == 'z') + xmon_off = 1; return cmd; case EOF: printf(" \n"); @@ -3248,8 +3251,11 @@ static void xmon_init(int enable) static void sysrq_handle_xmon(int key) { /* ensure xmon is enabled */ + xmon_off = 0; xmon_init(1); debugger(get_irq_regs()); + if (xmon_off) + xmon_init(0); } static struct sysrq_key_op sysrq_xmon_op = { @@ -3266,7 +3272,7 @@ static int __init setup_xmon_sysrq(void) __initcall(setup_xmon_sysrq); #endif /* CONFIG_MAGIC_SYSRQ */ -static int __initdata xmon_early, xmon_off; +static int __initdata xmon_early; static int __init early_parse_xmon(char *p) { -- 2.4.11