From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=mPqZ=A4=lists.ozlabs.org=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@kernel.org>
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=-11.5 required=3.0 tests=BAYES_00,
	HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,
	SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 E06C8C433E3
	for <linuxppc-dev@archiver.kernel.org>; Fri, 17 Jul 2020 08:31:10 +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 4FDC02071A
	for <linuxppc-dev@archiver.kernel.org>; Fri, 17 Jul 2020 08:31:09 +0000 (UTC)
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4FDC02071A
Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.vnet.ibm.com
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 4B7PTk0fVtzDrMX
	for <linuxppc-dev@archiver.kernel.org>; Fri, 17 Jul 2020 18:31:06 +1000 (AEST)
Authentication-Results: lists.ozlabs.org; spf=none (no SPF record)
 smtp.mailfrom=linux.vnet.ibm.com (client-ip=148.163.158.5;
 helo=mx0b-001b2d01.pphosted.com; envelope-from=ego@linux.vnet.ibm.com;
 receiver=<UNKNOWN>)
Authentication-Results: lists.ozlabs.org; dmarc=fail (p=none dis=none)
 header.from=linux.vnet.ibm.com
Received: from mx0b-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 4B7PR90FBhzDrMp
 for <linuxppc-dev@lists.ozlabs.org>; Fri, 17 Jul 2020 18:28:52 +1000 (AEST)
Received: from pps.filterd (m0127361.ppops.net [127.0.0.1])
 by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id
 06H83iRK061101; Fri, 17 Jul 2020 04:28:46 -0400
Received: from ppma02dal.us.ibm.com (a.bd.3ea9.ip4.static.sl-reverse.com
 [169.62.189.10])
 by mx0a-001b2d01.pphosted.com with ESMTP id 327u1mfjww-1
 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT);
 Fri, 17 Jul 2020 04:28:46 -0400
Received: from pps.filterd (ppma02dal.us.ibm.com [127.0.0.1])
 by ppma02dal.us.ibm.com (8.16.0.42/8.16.0.42) with SMTP id 06H8QN1n027122;
 Fri, 17 Jul 2020 08:28:45 GMT
Received: from b03cxnp08026.gho.boulder.ibm.com
 (b03cxnp08026.gho.boulder.ibm.com [9.17.130.18])
 by ppma02dal.us.ibm.com with ESMTP id 32752a39j0-1
 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT);
 Fri, 17 Jul 2020 08:28:45 +0000
Received: from b03ledav006.gho.boulder.ibm.com
 (b03ledav006.gho.boulder.ibm.com [9.17.130.237])
 by b03cxnp08026.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id
 06H8SdxJ42992064
 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK);
 Fri, 17 Jul 2020 08:28:39 GMT
Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1])
 by IMSVA (Postfix) with ESMTP id 5D2ACC605A;
 Fri, 17 Jul 2020 08:28:42 +0000 (GMT)
Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1])
 by IMSVA (Postfix) with ESMTP id 00571C6055;
 Fri, 17 Jul 2020 08:28:41 +0000 (GMT)
Received: from sofia.ibm.com (unknown [9.199.61.65])
 by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP;
 Fri, 17 Jul 2020 08:28:41 +0000 (GMT)
Received: by sofia.ibm.com (Postfix, from userid 1000)
 id 503862E3026; Fri, 17 Jul 2020 13:58:36 +0530 (IST)
Date: Fri, 17 Jul 2020 13:58:36 +0530
From: Gautham R Shenoy <ego@linux.vnet.ibm.com>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Subject: Re: [PATCH 11/11] powerpc/smp: Provide an ability to disable coregroup
Message-ID: <20200717082836.GG32531@in.ibm.com>
References: <20200714043624.5648-1-srikar@linux.vnet.ibm.com>
 <20200714043624.5648-12-srikar@linux.vnet.ibm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20200714043624.5648-12-srikar@linux.vnet.ibm.com>
User-Agent: Mutt/1.5.23 (2014-03-12)
X-TM-AS-GCONF: 00
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687
 definitions=2020-07-17_04:2020-07-17,
 2020-07-17 signatures=0
X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0
 adultscore=0 malwarescore=0
 spamscore=0 priorityscore=1501 clxscore=1015 mlxlogscore=999
 suspectscore=0 phishscore=0 bulkscore=0 impostorscore=0 mlxscore=0
 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1
 engine=8.12.0-2006250000 definitions=main-2007170059
X-BeenThere: linuxppc-dev@lists.ozlabs.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>
List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>
List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/>
List-Post: <mailto:linuxppc-dev@lists.ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>
List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>
Reply-To: ego@linux.vnet.ibm.com
Cc: Nathan Lynch <nathanl@linux.ibm.com>,
 Gautham R Shenoy <ego@linux.vnet.ibm.com>,
 Oliver OHalloran <oliveroh@au1.ibm.com>, Michael Neuling <mikey@linux.ibm.com>,
 Michael Ellerman <michaele@au1.ibm.com>, Anton Blanchard <anton@au1.ibm.com>,
 linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
 Nick Piggin <npiggin@au1.ibm.com>
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

On Tue, Jul 14, 2020 at 10:06:24AM +0530, Srikar Dronamraju wrote:
> If user wants to enable coregroup sched_domain then they can boot with
> kernel parameter "coregroup_support=on"
> 
> Cc: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
> Cc: Michael Ellerman <michaele@au1.ibm.com>
> Cc: Nick Piggin <npiggin@au1.ibm.com>
> Cc: Oliver OHalloran <oliveroh@au1.ibm.com>
> Cc: Nathan Lynch <nathanl@linux.ibm.com>
> Cc: Michael Neuling <mikey@linux.ibm.com>
> Cc: Anton Blanchard <anton@au1.ibm.com>
> Cc: Gautham R Shenoy <ego@linux.vnet.ibm.com>
> Cc: Vaidyanathan Srinivasan <svaidy@linux.ibm.com>
> Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>


We need this documented in the
Documentation/admin-guide/kernel-parameters.txt

Other than that, the patch looks good to me.
Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>

> ---
>  arch/powerpc/kernel/smp.c | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
> index bb25c13bbb79..c43909e6e8e9 100644
> --- a/arch/powerpc/kernel/smp.c
> +++ b/arch/powerpc/kernel/smp.c
> @@ -118,6 +118,23 @@ struct smp_ops_t *smp_ops;
>  volatile unsigned int cpu_callin_map[NR_CPUS];
> 
>  int smt_enabled_at_boot = 1;
> +int coregroup_support;
> +
> +static int __init early_coregroup(char *p)
> +{
> +	if (!p)
> +		return 0;
> +
> +	if (strstr(p, "on"))
> +		coregroup_support = 1;
> +
> +	if (strstr(p, "1"))
> +		coregroup_support = 1;
> +
> +	return 0;
> +}
> +
> +early_param("coregroup_support", early_coregroup);
> 
>  /*
>   * Returns 1 if the specified cpu should be brought up during boot.
> @@ -878,7 +895,7 @@ static struct cpumask *cpu_coregroup_mask(int cpu)
> 
>  static bool has_coregroup_support(void)
>  {
> -	return coregroup_enabled;
> +	return coregroup_enabled && coregroup_support;
>  }
> 
>  static const struct cpumask *cpu_mc_mask(int cpu)
> -- 
> 2.17.1
>