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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 69598C43331 for ; Tue, 12 Nov 2019 17:55:12 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 22C642084E for ; Tue, 12 Nov 2019 17:55:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 22C642084E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 47CFl10tVJzF4QM for ; Wed, 13 Nov 2019 04:55:09 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=suse.de (client-ip=195.135.220.15; helo=mx1.suse.de; envelope-from=msuchanek@suse.de; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from mx1.suse.de (mx2.suse.de [195.135.220.15]) (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 47CDNF0PpWzF33t for ; Wed, 13 Nov 2019 03:53:49 +1100 (AEDT) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id DA4ECB13D; Tue, 12 Nov 2019 16:53:45 +0000 (UTC) From: Michal Suchanek To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH 21/33] powerpc/64s/exception: soft nmi interrupt should not use ret_from_except Date: Tue, 12 Nov 2019 17:52:19 +0100 Message-Id: <85d3a8b3062501f545d16d4caf1c4925ce2fe618.1573576649.git.msuchanek@suse.de> X-Mailer: git-send-email 2.23.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Madhavan Srinivasan , David Hildenbrand , Heiko Carstens , Claudio Carvalho , David Howells , Masahiro Yamada , Paul Mackerras , Christian Brauner , Breno Leitao , Michael Neuling , Nicolai Stange , Diana Craciun , Firoz Khan , Allison Randal , Mahesh Salgaonkar , Geert Uytterhoeven , "Naveen N. Rao" , Michal Suchanek , Valentin Schneider , Jagadeesh Pagadala , Arnd Bergmann , Nicholas Piggin , Alexander Viro , Steven Rostedt , Thomas Gleixner , Dmitry Vyukov , Daniel Axtens , Gustavo Romero , Mathieu Malaterre , Greg Kroah-Hartman , Oleg Nesterov , linux-kernel@vger.kernel.org, "Eric W. Biederman" , Andrew Donnellan , Brajeswar Ghosh , Hari Bathini , Andrew Morton Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Nicholas Piggin The soft nmi handler does not reconcile interrupt state, so it should not return via the normal ret_from_except path. Return like other NMIs, using the EXCEPTION_RESTORE_REGS macro. This becomes important when the scv interrupt is implemented, which must handle soft-masked interrupts that have r13 set to something other than the PACA -- returning to kernel in this case must restore r13. Signed-off-by: Nicholas Piggin --- arch/powerpc/kernel/exceptions-64s.S | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 38bc66b95516..af1264cd005f 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -2740,7 +2740,11 @@ EXC_COMMON_BEGIN(soft_nmi_common) bl save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD bl soft_nmi_interrupt - b ret_from_except + /* Clear MSR_RI before setting SRR0 and SRR1. */ + li r9,0 + mtmsrd r9,1 + EXCEPTION_RESTORE_REGS hsrr=0 + RFI_TO_KERNEL #endif /* CONFIG_PPC_WATCHDOG */ -- 2.23.0