From patchwork Tue Jan 29 07:51:01 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Pitre X-Patchwork-Id: 2060201 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork2.kernel.org (Postfix) with ESMTP id 3AEA6DF23E for ; Tue, 29 Jan 2013 07:55:48 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1U060V-0006ia-Jg; Tue, 29 Jan 2013 07:53:27 +0000 Received: from relais.videotron.ca ([24.201.245.36]) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1U05yg-0005i3-Uz for linux-arm-kernel@lists.infradead.org; Tue, 29 Jan 2013 07:51:37 +0000 Received: from yoda.home ([24.202.213.203]) by VL-VM-MR003.ip.videotron.ca (Oracle Communications Messaging Exchange Server 7u4-22.01 64bit (built Apr 21 2011)) with ESMTP id <0MHD000PGN5M8M90@VL-VM-MR003.ip.videotron.ca> for linux-arm-kernel@lists.infradead.org; Tue, 29 Jan 2013 02:51:22 -0500 (EST) Received: from xanadu.home (xanadu.home [192.168.2.2]) by yoda.home (Postfix) with ESMTP id 00C1F2DA0142; Tue, 29 Jan 2013 02:51:22 -0500 (EST) From: Nicolas Pitre To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 06/15] ARM: mcpm: generic SMP secondary bringup and hotplug support Date: Tue, 29 Jan 2013 02:51:01 -0500 Message-id: <1359445870-18925-7-git-send-email-nicolas.pitre@linaro.org> X-Mailer: git-send-email 1.8.1.2 In-reply-to: <1359445870-18925-1-git-send-email-nicolas.pitre@linaro.org> References: <1359445870-18925-1-git-send-email-nicolas.pitre@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130129_025135_081672_DFFF02D7 X-CRM114-Status: GOOD ( 15.71 ) X-Spam-Score: -1.9 (-) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-1.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [24.201.245.36 listed in list.dnswl.org] -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Dave Martin , Lorenzo Pieralisi , Pawel Moll , Catalin Marinas , Will Deacon , Santosh Shilimkar X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Now that the cluster power API is in place, we can use it for SMP secondary bringup and CPU hotplug in a generic fashion. Signed-off-by: Nicolas Pitre Reviewed-by: Santosh Shilimkar --- arch/arm/common/Makefile | 2 +- arch/arm/common/mcpm_platsmp.c | 85 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 86 insertions(+), 1 deletion(-) create mode 100644 arch/arm/common/mcpm_platsmp.c diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile index c901a38c59..e1c9db45de 100644 --- a/arch/arm/common/Makefile +++ b/arch/arm/common/Makefile @@ -13,4 +13,4 @@ obj-$(CONFIG_SHARP_PARAM) += sharpsl_param.o obj-$(CONFIG_SHARP_SCOOP) += scoop.o obj-$(CONFIG_PCI_HOST_ITE8152) += it8152.o obj-$(CONFIG_ARM_TIMER_SP804) += timer-sp.o -obj-$(CONFIG_CLUSTER_PM) += mcpm_head.o mcpm_entry.o vlock.o +obj-$(CONFIG_CLUSTER_PM) += mcpm_head.o mcpm_entry.o mcpm_platsmp.o vlock.o diff --git a/arch/arm/common/mcpm_platsmp.c b/arch/arm/common/mcpm_platsmp.c new file mode 100644 index 0000000000..401298f5ee --- /dev/null +++ b/arch/arm/common/mcpm_platsmp.c @@ -0,0 +1,85 @@ +/* + * linux/arch/arm/mach-vexpress/mcpm_platsmp.c + * + * Created by: Nicolas Pitre, November 2012 + * Copyright: (C) 2012-2013 Linaro Limited + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Code to handle secondary CPU bringup and hotplug for the cluster power API. + */ + +#include +#include + +#include +#include +#include + +static void __init simple_smp_init_cpus(void) +{ + set_smp_cross_call(gic_raise_softirq); +} + +static int __cpuinit mcpm_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + unsigned int mpidr, pcpu, pcluster, ret; + extern void secondary_startup(void); + + mpidr = cpu_logical_map(cpu); + pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); + pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); + pr_debug("%s: logical CPU %d is physical CPU %d cluster %d\n", + __func__, cpu, pcpu, pcluster); + + mcpm_set_entry_vector(pcpu, pcluster, NULL); + ret = mcpm_cpu_power_up(pcpu, pcluster); + if (ret) + return ret; + mcpm_set_entry_vector(pcpu, pcluster, secondary_startup); + gic_raise_softirq(cpumask_of(cpu), 0); + dsb_sev(); + return 0; +} + +static void __cpuinit mcpm_secondary_init(unsigned int cpu) +{ + mcpm_cpu_powered_up(); + gic_secondary_init(0); +} + +#ifdef CONFIG_HOTPLUG_CPU + +static int mcpm_cpu_disable(unsigned int cpu) +{ + /* + * We assume all CPUs may be shut down. + * This would be the hook to use for eventual Secure + * OS migration requests as described in the PSCI spec. + */ + return 0; +} + +static void mcpm_cpu_die(unsigned int cpu) +{ + unsigned int mpidr, pcpu, pcluster; + mpidr = read_cpuid_mpidr(); + pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); + pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); + mcpm_set_entry_vector(pcpu, pcluster, NULL); + mcpm_cpu_power_down(); +} + +#endif + +struct smp_operations __initdata mcpm_smp_ops = { + .smp_init_cpus = simple_smp_init_cpus, + .smp_boot_secondary = mcpm_boot_secondary, + .smp_secondary_init = mcpm_secondary_init, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_disable = mcpm_cpu_disable, + .cpu_die = mcpm_cpu_die, +#endif +};