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 41B2fL6G7MzF12N for ; Thu, 21 Jun 2018 10:30:18 +1000 (AEST) Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w5L0Ss3U086365 for ; Wed, 20 Jun 2018 20:30:15 -0400 Received: from e31.co.us.ibm.com (e31.co.us.ibm.com [32.97.110.149]) by mx0b-001b2d01.pphosted.com with ESMTP id 2jqx24xkgx-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 20 Jun 2018 20:30:14 -0400 Received: from localhost by e31.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 20 Jun 2018 18:30:14 -0600 From: Michael Bringmann To: linuxppc-dev@lists.ozlabs.org Cc: Michael Bringmann , Nathan Fontenot , John Allen , Tyrel Datwyler , Thomas Falcon Subject: [PATCH v04 7/9] powerpc/rtas: Allow disabling rtas_event_scan In-Reply-To: <0425b353-54b0-6ccd-fbb6-3d26d9448bb5@linux.vnet.ibm.com> Date: Wed, 20 Jun 2018 19:30:07 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Message-Id: List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , powerpc/rtas: Provide mechanism by which the rtas_event_scan can be disabled/re-enabled by other portions of the powerpc code. Among other things, this simplifies the usage of locking mechanisms for shared kernel resources. Signed-off-by: Michael Bringmann --- arch/powerpc/include/asm/rtas.h | 4 ++++ arch/powerpc/kernel/rtasd.c | 14 ++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h index 4f45152..a94e3ff 100644 --- a/arch/powerpc/include/asm/rtas.h +++ b/arch/powerpc/include/asm/rtas.h @@ -386,8 +386,12 @@ extern int early_init_dt_scan_rtas(unsigned long node, #ifdef CONFIG_PPC_RTAS_DAEMON extern void rtas_cancel_event_scan(void); +extern void rtas_event_scan_disable(void); +extern void rtas_event_scan_enable(void); #else static inline void rtas_cancel_event_scan(void) { } +static inline void rtas_event_scan_disable(void) { } +static inline void rtas_event_scan_enable(void) { } #endif /* Error types logged. */ diff --git a/arch/powerpc/kernel/rtasd.c b/arch/powerpc/kernel/rtasd.c index f915db9..72f3696 100644 --- a/arch/powerpc/kernel/rtasd.c +++ b/arch/powerpc/kernel/rtasd.c @@ -455,11 +455,25 @@ static void do_event_scan(void) */ static unsigned long event_scan_delay = 1*HZ; static int first_pass = 1; +static int res_enable = 1; + +void rtas_event_scan_disable(void) +{ + res_enable = 0; +} + +void rtas_event_scan_enable(void) +{ + res_enable = 1; +} static void rtas_event_scan(struct work_struct *w) { unsigned int cpu; + if (!res_enable) + return; + do_event_scan(); get_online_cpus();