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Wed, 22 Jul 2020 07:06:35 +0000 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp08028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 06M76X7l66454014 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 22 Jul 2020 07:06:33 GMT Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6C0AD7805C; Wed, 22 Jul 2020 07:06:33 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1522D78063; Wed, 22 Jul 2020 07:06:32 +0000 (GMT) Received: from sofia.ibm.com (unknown [9.85.82.72]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 22 Jul 2020 07:06:32 +0000 (GMT) Received: by sofia.ibm.com (Postfix, from userid 1000) id CF9902E340E; Wed, 22 Jul 2020 12:36:28 +0530 (IST) Date: Wed, 22 Jul 2020 12:36:28 +0530 From: Gautham R Shenoy To: Srikar Dronamraju Subject: Re: [PATCH v2 10/10] powerpc/smp: Implement cpu_to_coregroup_id Message-ID: <20200722070628.GG31038@in.ibm.com> References: <20200721113814.32284-1-srikar@linux.vnet.ibm.com> <20200721113814.32284-11-srikar@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200721113814.32284-11-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=2020-07-22_03:2020-07-22, 2020-07-22 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 bulkscore=0 mlxlogscore=999 clxscore=1015 phishscore=0 mlxscore=0 lowpriorityscore=0 suspectscore=0 impostorscore=0 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007220052 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: , Reply-To: ego@linux.vnet.ibm.com Cc: Nathan Lynch , Gautham R Shenoy , Oliver OHalloran , Michael Neuling , Michael Ellerman , Peter Zijlstra , Jordan Niethe , Anton Blanchard , LKML , Ingo Molnar , Nick Piggin , linuxppc-dev , Valentin Schneider Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, Jul 21, 2020 at 05:08:14PM +0530, Srikar Dronamraju wrote: > Lookup the coregroup id from the associativity array. > > If unable to detect the coregroup id, fallback on the core id. > This way, ensure sched_domain degenerates and an extra sched domain is > not created. > > Ideally this function should have been implemented in > arch/powerpc/kernel/smp.c. However if its implemented in mm/numa.c, we > don't need to find the primary domain again. > > If the device-tree mentions more than one coregroup, then kernel > implements only the last or the smallest coregroup, which currently > corresponds to the penultimate domain in the device-tree. > > Cc: linuxppc-dev > Cc: LKML > Cc: Michael Ellerman > Cc: Ingo Molnar > Cc: Peter Zijlstra > Cc: Valentin Schneider > Cc: Nick Piggin > Cc: Oliver OHalloran > Cc: Nathan Lynch > Cc: Michael Neuling > Cc: Anton Blanchard > Cc: Gautham R Shenoy > Cc: Vaidyanathan Srinivasan > Cc: Jordan Niethe > Signed-off-by: Srikar Dronamraju Looks good to me. Reviewed-by : Gautham R. Shenoy > --- > Changelog v1 -> v2: > powerpc/smp: Implement cpu_to_coregroup_id > Move coregroup_enabled before getting associativity (Gautham) > > arch/powerpc/mm/numa.c | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) > > diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c > index ef8aa580da21..ae57b68beaee 100644 > --- a/arch/powerpc/mm/numa.c > +++ b/arch/powerpc/mm/numa.c > @@ -1218,6 +1218,26 @@ int find_and_online_cpu_nid(int cpu) > > int cpu_to_coregroup_id(int cpu) > { > + __be32 associativity[VPHN_ASSOC_BUFSIZE] = {0}; > + int index; > + > + if (cpu < 0 || cpu > nr_cpu_ids) > + return -1; > + > + if (!coregroup_enabled) > + goto out; > + > + if (!firmware_has_feature(FW_FEATURE_VPHN)) > + goto out; > + > + if (vphn_get_associativity(cpu, associativity)) > + goto out; > + > + index = of_read_number(associativity, 1); > + if (index > min_common_depth + 1) > + return of_read_number(&associativity[index - 1], 1); > + > +out: > return cpu_to_core_id(cpu); > } > > -- > 2.17.1 >