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Mon, 10 Aug 2020 07:19:12 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5197B11C050; Mon, 10 Aug 2020 07:19:10 +0000 (GMT) Received: from srikart450.in.ibm.com (unknown [9.102.18.208]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 10 Aug 2020 07:19:10 +0000 (GMT) From: Srikar Dronamraju To: Michael Ellerman Cc: linuxppc-dev , Srikar Dronamraju , LKML , Nicholas Piggin , Anton Blanchard , "Oliver O'Halloran" , Nathan Lynch , Michael Neuling , Gautham R Shenoy , Ingo Molnar , Peter Zijlstra , Valentin Schneider , Jordan Niethe , Vaidyanathan Srinivasan Subject: [PATCH v5 10/10] powerpc/smp: Implement cpu_to_coregroup_id Date: Mon, 10 Aug 2020 12:48:34 +0530 Message-Id: <20200810071834.92514-11-srikar@linux.vnet.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200810071834.92514-1-srikar@linux.vnet.ibm.com> References: <20200810071834.92514-1-srikar@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-08-10_02:2020-08-06,2020-08-10 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 phishscore=0 impostorscore=0 mlxlogscore=849 priorityscore=1501 lowpriorityscore=0 bulkscore=0 malwarescore=0 adultscore=0 suspectscore=0 clxscore=1015 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008100048 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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: Nicholas Piggin Cc: Anton Blanchard Cc: Oliver O'Halloran Cc: Nathan Lynch Cc: Michael Neuling Cc: Gautham R Shenoy Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Valentin Schneider Cc: Jordan Niethe Cc: Vaidyanathan Srinivasan Reviewed-by: Gautham R. Shenoy Signed-off-by: Srikar Dronamraju --- Changelog v1 -> v2: 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 0d57779e7942..8b3b3ec7fcc4 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); } -- 2.18.2