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Tue, 21 Jul 2020 11:39:07 +0000 Received: from d06av24.portsmouth.uk.ibm.com (mk.ibm.com [9.149.105.60]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 06LBd21r25821680 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 21 Jul 2020 11:39:02 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B50C642047; Tue, 21 Jul 2020 11:39:02 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 79E8542042; Tue, 21 Jul 2020 11:38:58 +0000 (GMT) Received: from srikart450.in.ibm.com (unknown [9.85.93.17]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 21 Jul 2020 11:38:58 +0000 (GMT) From: Srikar Dronamraju To: Michael Ellerman Subject: [PATCH v2 07/10] Powerpc/numa: Detect support for coregroup Date: Tue, 21 Jul 2020 17:08:11 +0530 Message-Id: <20200721113814.32284-8-srikar@linux.vnet.ibm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200721113814.32284-1-srikar@linux.vnet.ibm.com> References: <20200721113814.32284-1-srikar@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-07-21_05:2020-07-21, 2020-07-21 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 malwarescore=0 mlxlogscore=999 suspectscore=0 lowpriorityscore=0 adultscore=0 priorityscore=1501 mlxscore=0 phishscore=0 impostorscore=0 spamscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007210077 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: , Cc: Nathan Lynch , Gautham R Shenoy , Oliver OHalloran , Michael Neuling , Srikar Dronamraju , Peter Zijlstra , Jordan Niethe , Anton Blanchard , LKML , Valentin Schneider , Nick Piggin , linuxppc-dev , Ingo Molnar Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Add support for grouping cores based on the device-tree classification. - The last domain in the associativity domains always refers to the core. - If primary reference domain happens to be the penultimate domain in the associativity domains device-tree property, then there are no coregroups. However if its not a penultimate domain, then there are coregroups. There can be more than one coregroup. For now we would be interested in the last or the smallest coregroups. 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 Reviewed-by: Gautham R. Shenoy Signed-off-by: Srikar Dronamraju --- Changelog v1 -> v2: Powerpc/numa: Detect support for coregroup Explained Coregroup in commit msg (Michael Ellerman) arch/powerpc/include/asm/smp.h | 1 + arch/powerpc/kernel/smp.c | 1 + arch/powerpc/mm/numa.c | 34 +++++++++++++++++++++------------- 3 files changed, 23 insertions(+), 13 deletions(-) diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h index 49a25e2400f2..5bdc17a7049f 100644 --- a/arch/powerpc/include/asm/smp.h +++ b/arch/powerpc/include/asm/smp.h @@ -28,6 +28,7 @@ extern int boot_cpuid; extern int spinning_secondaries; extern u32 *cpu_to_phys_id; +extern bool coregroup_enabled; extern void cpu_die(void); extern int cpu_to_chip_id(int cpu); diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index 933ebdf97432..320e36a0ec0b 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -74,6 +74,7 @@ static DEFINE_PER_CPU(int, cpu_state) = { 0 }; struct task_struct *secondary_current; bool has_big_cores; +bool coregroup_enabled; DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map); DEFINE_PER_CPU(cpumask_var_t, cpu_smallcore_map); diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index bc5b2e8112c8..3248160c0327 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -886,7 +886,9 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn) static void __init find_possible_nodes(void) { struct device_node *rtas; - u32 numnodes, i; + const __be32 *domains; + int prop_length, max_nodes; + u32 i; if (!numa_enabled) return; @@ -895,25 +897,31 @@ static void __init find_possible_nodes(void) if (!rtas) return; - if (of_property_read_u32_index(rtas, "ibm,current-associativity-domains", - min_common_depth, &numnodes)) { - /* - * ibm,current-associativity-domains is a fairly recent - * property. If it doesn't exist, then fallback on - * ibm,max-associativity-domains. Current denotes what the - * platform can support compared to max which denotes what the - * Hypervisor can support. - */ - if (of_property_read_u32_index(rtas, "ibm,max-associativity-domains", - min_common_depth, &numnodes)) + /* + * ibm,current-associativity-domains is a fairly recent property. If + * it doesn't exist, then fallback on ibm,max-associativity-domains. + * Current denotes what the platform can support compared to max + * which denotes what the Hypervisor can support. + */ + domains = of_get_property(rtas, "ibm,current-associativity-domains", + &prop_length); + if (!domains) { + domains = of_get_property(rtas, "ibm,max-associativity-domains", + &prop_length); + if (!domains) goto out; } - for (i = 0; i < numnodes; i++) { + max_nodes = of_read_number(&domains[min_common_depth], 1); + for (i = 0; i < max_nodes; i++) { if (!node_possible(i)) node_set(i, node_possible_map); } + prop_length /= sizeof(int); + if (prop_length > min_common_depth + 2) + coregroup_enabled = 1; + out: of_node_put(rtas); } -- 2.17.1