From patchwork Tue Mar 27 04:37:23 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Neuling X-Patchwork-Id: 891347 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=neuling.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 409JCb4d08z9s52 for ; Tue, 27 Mar 2018 15:37:47 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751082AbeC0Ehj (ORCPT ); Tue, 27 Mar 2018 00:37:39 -0400 Received: from ozlabs.org ([103.22.144.67]:32831 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751077AbeC0Ehg (ORCPT ); Tue, 27 Mar 2018 00:37:36 -0400 Received: from localhost.localdomain (localhost [127.0.0.1]) by ozlabs.org (Postfix) with ESMTP id 409JCJ4V2Sz9s1p; Tue, 27 Mar 2018 15:37:32 +1100 (AEDT) Received: by localhost.localdomain (Postfix, from userid 1000) id 6F96AEE78C4; Tue, 27 Mar 2018 15:37:31 +1100 (AEDT) From: Michael Neuling To: mpe@ellerman.id.au Cc: linuxppc-dev@lists.ozlabs.org, paulus@ozlabs.org, david@gibson.dropbear.id.au, npiggin@gmail.com, pedromfc@linux.vnet.ibm.com, kvm-ppc@vger.kernel.org, Ananth N Mavinakayanahalli Subject: [PATCH v3 7/8] powerpc: Disable DAWR on POWER9 via CPU feature quirk Date: Tue, 27 Mar 2018 15:37:23 +1100 Message-Id: <20180327043724.13862-8-mikey@neuling.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20180327043724.13862-1-mikey@neuling.org> References: <20180327043724.13862-1-mikey@neuling.org> Sender: kvm-ppc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org This disables the DAWR on all POWER9 CPUs via cpu feature quirk. Using the DAWR on POWER9 can cause xstops, hence we need to disable it. Signed-off-by: Michael Neuling --- arch/powerpc/kernel/dt_cpu_ftrs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c index 945e2c29ad..941a5fbd8d 100644 --- a/arch/powerpc/kernel/dt_cpu_ftrs.c +++ b/arch/powerpc/kernel/dt_cpu_ftrs.c @@ -709,6 +709,9 @@ static __init void cpufeatures_cpu_quirks(void) cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD1; else if ((version & 0xffffefff) == 0x004e0201) cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1; + + if ((version & 0xffff0000) == 0x004e0000) + cur_cpu_spec->cpu_features &= ~(CPU_FTR_DAWR); } static void __init cpufeatures_setup_finished(void)