From mboxrd@z Thu Jan 1 00:00:00 1970 From: nicolas.pitre@linaro.org (Nicolas Pitre) Date: Tue, 29 Jan 2013 02:51:01 -0500 Subject: [PATCH v3 06/15] ARM: mcpm: generic SMP secondary bringup and hotplug support In-Reply-To: <1359445870-18925-1-git-send-email-nicolas.pitre@linaro.org> References: <1359445870-18925-1-git-send-email-nicolas.pitre@linaro.org> Message-ID: <1359445870-18925-7-git-send-email-nicolas.pitre@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.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 --- 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 +}; -- 1.8.1.2