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Message-Id: <1357861230-29549-5-git-send-email-toshi.kani@hp.com> Date: Thu, 10 Jan 2013 16:40:22 -0700 From: Toshi Kani <toshi.kani@...com> To: rjw@...k.pl, lenb@...nel.org, gregkh@...uxfoundation.org, akpm@...ux-foundation.org Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org, bhelgaas@...gle.com, isimatu.yasuaki@...fujitsu.com, jiang.liu@...wei.com, wency@...fujitsu.com, guohanjun@...wei.com, yinghai@...nel.org, srivatsa.bhat@...ux.vnet.ibm.com, Toshi Kani <toshi.kani@...com> Subject: [RFC PATCH v2 04/12] cpu: Add cpu hotplug handlers Added cpu hotplug handlers. cpu_add_execute() onlines requested cpus for hot-add & online operations, and cpu_del_execute() offlines them for hot-delete & offline operations. They are also used for rollback as well. cpu_del_validate() fails a request if cpu0 is requested to delete. Signed-off-by: Toshi Kani <toshi.kani@...com> --- drivers/base/cpu.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 107 insertions(+) diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c index 6345294..05534ad 100644 --- a/drivers/base/cpu.c +++ b/drivers/base/cpu.c @@ -13,6 +13,8 @@ #include <linux/gfp.h> #include <linux/slab.h> #include <linux/percpu.h> +#include <linux/list.h> +#include <linux/sys_hotplug.h> #include "base.h" @@ -324,10 +326,115 @@ static void __init cpu_dev_register_generic(void) #endif } +#ifdef CONFIG_HOTPLUG_CPU +static int cpu_del_execute(struct shp_request *req, int rollback); + +static int cpu_add_execute(struct shp_request *req, int rollback) +{ + struct shp_device *shp_dev; + u32 cpu; + int ret; + + if (rollback) + return cpu_del_execute(req, 0); + + list_for_each_entry(shp_dev, &req->dev_list, list) { + if (shp_dev->class != SHP_CLS_CPU) + continue; + + cpu = shp_dev->info.cpu.cpu_id; + + if (cpu_online(cpu)) + continue; + + ret = cpu_up(cpu); + if (!ret) { + /* REVISIT: need a way to set a cpu dev for hot-plug */ + if (shp_is_online_op(req->operation)) + kobject_uevent(&shp_dev->device->kobj, + KOBJ_ONLINE); + } else { + pr_err("cpu: Failed to online cpu %d\n", cpu); + /* fall-thru */ + } + } + + return 0; +} + +static int cpu_del_validate(struct shp_request *req, int rollback) +{ + struct shp_device *shp_dev; + + if (rollback) + return 0; + + list_for_each_entry(shp_dev, &req->dev_list, list) { + if (shp_dev->class != SHP_CLS_CPU) + continue; + + /* + * cpu 0 cannot be offlined. This check can be removed when + * cpu 0 offline is supported. + */ + if (shp_dev->info.cpu.cpu_id == 0) + return -EINVAL; + } + + return 0; +} + +static int cpu_del_execute(struct shp_request *req, int rollback) +{ + struct shp_device *shp_dev; + u32 cpu; + int ret; + + if (rollback) + return cpu_add_execute(req, 0); + + list_for_each_entry(shp_dev, &req->dev_list, list) { + if (shp_dev->class != SHP_CLS_CPU) + continue; + + cpu = shp_dev->info.cpu.cpu_id; + + if (!cpu_online(cpu)) + continue; + + ret = cpu_down(cpu); + if (!ret) { + /* REVISIT: need a way to set a cpu dev for hot-plug */ + if (shp_is_online_op(req->operation)) + kobject_uevent(&shp_dev->device->kobj, + KOBJ_OFFLINE); + } else { + pr_err("cpu: Failed to offline cpu %d\n", cpu); + return ret; + } + } + + return 0; +} + +static void __init cpu_shp_init(void) +{ + shp_register_handler(SHP_ADD_EXECUTE, cpu_add_execute, + SHP_CPU_ADD_EXECUTE_ORDER); + shp_register_handler(SHP_DEL_VALIDATE, cpu_del_validate, + SHP_CPU_DEL_VALIDATE_ORDER); + shp_register_handler(SHP_DEL_EXECUTE, cpu_del_execute, + SHP_CPU_DEL_EXECUTE_ORDER); +} +#endif /* CONFIG_HOTPLUG_CPU */ + void __init cpu_dev_init(void) { if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups)) panic("Failed to register CPU subsystem"); cpu_dev_register_generic(); +#ifdef CONFIG_HOTPLUG_CPU + cpu_shp_init(); +#endif } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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