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: 891373 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 409JcY0t34z9ryr for ; Tue, 27 Mar 2018 15:55:57 +1100 (AEDT) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=neuling.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 409JcX6ZFjzF254 for ; Tue, 27 Mar 2018 15:55:56 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=neuling.org X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from ozlabs.org (bilbo.ozlabs.org [103.22.144.67]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 409JCK2hVWzF27f for ; Tue, 27 Mar 2018 15:37:33 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=neuling.org 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 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> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm-ppc@vger.kernel.org, npiggin@gmail.com, david@gibson.dropbear.id.au, linuxppc-dev@lists.ozlabs.org, pedromfc@linux.vnet.ibm.com Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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)