From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-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 3wyX9h1fgSzDr4d for ; Thu, 29 Jun 2017 04:58:00 +1000 (AEST) Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v5SIs91x066204 for ; Wed, 28 Jun 2017 14:57:57 -0400 Received: from e23smtp05.au.ibm.com (e23smtp05.au.ibm.com [202.81.31.147]) by mx0b-001b2d01.pphosted.com with ESMTP id 2bcfwe68ey-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Wed, 28 Jun 2017 14:57:57 -0400 Received: from localhost by e23smtp05.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 29 Jun 2017 04:57:54 +1000 Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v5SIvpEa2031952 for ; Thu, 29 Jun 2017 04:57:51 +1000 Received: from d23av02.au.ibm.com (localhost [127.0.0.1]) by d23av02.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v5SIvgqj029815 for ; Thu, 29 Jun 2017 04:57:43 +1000 From: Anju T Sudhakar To: mpe@ellerman.id.au Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, ego@linux.vnet.ibm.com, bsingharora@gmail.com, anton@samba.org, sukadev@linux.vnet.ibm.com, mikey@neuling.org, stewart@linux.vnet.ibm.com, dja@axtens.net, eranian@google.com, hemant@linux.vnet.ibm.com, maddy@linux.vnet.ibm.com, anju@linux.vnet.ibm.com Subject: [PATCH v11 10/10] powerpc/perf: Thread imc cpuhotplug support Date: Thu, 29 Jun 2017 00:27:12 +0530 In-Reply-To: <1498676232-23841-1-git-send-email-anju@linux.vnet.ibm.com> References: <1498676232-23841-1-git-send-email-anju@linux.vnet.ibm.com> Message-Id: <1498676232-23841-8-git-send-email-anju@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Code to add support for thread IMC on cpuhotplug. When a cpu goes offline, the LDBAR for that cpu is disabled, and when it comes back online the previous ldbar value is written back to the LDBAR for that cpu. To register the hotplug functions for thread_imc, a new state CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE is added to the list of existing states. Signed-off-by: Anju T Sudhakar Signed-off-by: Madhavan Srinivasan --- arch/powerpc/perf/imc-pmu.c | 38 +++++++++++++++++++++++++++++++++++++- include/linux/cpuhotplug.h | 1 + 2 files changed, 38 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c index 3deefb1..afd5306 100644 --- a/arch/powerpc/perf/imc-pmu.c +++ b/arch/powerpc/perf/imc-pmu.c @@ -346,6 +346,37 @@ static int imc_mem_init(struct imc_pmu *pmu_ptr) return 0; } +static int ppc_thread_imc_cpu_online(unsigned int cpu) +{ + int rc = 0; + u64 ldbar_value; + + if (per_cpu(thread_imc_mem, cpu) == NULL) + rc = thread_imc_mem_alloc(cpu, thread_imc_mem_size); + + if (rc) + mtspr(SPRN_LDBAR, 0); + + ldbar_value = ((u64)per_cpu(thread_imc_mem, cpu) & (u64)THREAD_IMC_LDBAR_MASK) | + (u64)THREAD_IMC_ENABLE; + mtspr(SPRN_LDBAR, ldbar_value); + return 0; +} + +static int ppc_thread_imc_cpu_offline(unsigned int cpu) +{ + mtspr(SPRN_LDBAR, 0); + return 0; +} + +void thread_imc_cpu_init(void) +{ + cpuhp_setup_state(CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE, + "perf/powerpc/imc_thread:online", + ppc_thread_imc_cpu_online, + ppc_thread_imc_cpu_offline); +} + static int ppc_core_imc_cpu_online(unsigned int cpu) { const struct cpumask *l_cpumask; @@ -901,6 +932,9 @@ int init_imc_pmu(struct imc_events *events, int idx, if (ret) return ret; break; + case IMC_DOMAIN_THREAD: + thread_imc_cpu_init(); + break; default: return -1; /* Unknown domain */ } @@ -942,7 +976,9 @@ int init_imc_pmu(struct imc_events *events, int idx, cpuhp_remove_state(CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE); } /* For thread_imc, we have allocated memory, we need to free it */ - if (pmu_ptr->domain == IMC_DOMAIN_THREAD) + if (pmu_ptr->domain == IMC_DOMAIN_THREAD) { cleanup_all_thread_imc_memory(); + cpuhp_remove_state(CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE); + } return ret; } diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index e145fff..937d1ec 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -141,6 +141,7 @@ enum cpuhp_state { CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE, CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE, CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE, + CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE, CPUHP_AP_WORKQUEUE_ONLINE, CPUHP_AP_RCUTREE_ONLINE, CPUHP_AP_ONLINE_DYN, -- 2.7.4