Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754668AbcKUPvb (ORCPT ); Mon, 21 Nov 2016 10:51:31 -0500 Received: from terminus.zytor.com ([198.137.202.10]:40404 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754480AbcKUPv3 (ORCPT ); Mon, 21 Nov 2016 10:51:29 -0500 Date: Mon, 21 Nov 2016 07:51:19 -0800 From: tip-bot for Sebastian Andrzej Siewior Message-ID: Cc: linux-kernel@vger.kernel.org, davem@davemloft.net, tglx@linutronix.de, mingo@kernel.org, ubraun@linux.vnet.ibm.com, hpa@zytor.com, bigeasy@linutronix.de Reply-To: linux-kernel@vger.kernel.org, ubraun@linux.vnet.ibm.com, hpa@zytor.com, mingo@kernel.org, davem@davemloft.net, tglx@linutronix.de, bigeasy@linutronix.de In-Reply-To: <20161117183541.8588-13-bigeasy@linutronix.de> References: <20161117183541.8588-13-bigeasy@linutronix.de> To: linux-tip-commits@vger.kernel.org Subject: [tip:smp/hotplug] net/iucv: Convert to hotplug state machine Git-Commit-ID: bc30e3fc0d1476c933f3f4d88db1552de3515b44 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6691 Lines: 239 Commit-ID: bc30e3fc0d1476c933f3f4d88db1552de3515b44 Gitweb: http://git.kernel.org/tip/bc30e3fc0d1476c933f3f4d88db1552de3515b44 Author: Sebastian Andrzej Siewior AuthorDate: Thu, 17 Nov 2016 19:35:33 +0100 Committer: Thomas Gleixner CommitDate: Mon, 21 Nov 2016 16:37:07 +0100 net/iucv: Convert to hotplug state machine Install the callbacks via the state machine and let the core invoke the callbacks on the already online CPUs. The smp function calls in the online/downprep callbacks are not required as the callback is guaranteed to be invoked on the upcoming/outgoing cpu. Signed-off-by: Sebastian Andrzej Siewior Cc: "David S. Miller" Cc: linux-s390@vger.kernel.org Cc: netdev@vger.kernel.org Cc: Ursula Braun Cc: rt@linuxtronix.de Link: http://lkml.kernel.org/r/20161117183541.8588-13-bigeasy@linutronix.de Signed-off-by: Thomas Gleixner --- include/linux/cpuhotplug.h | 1 + net/iucv/iucv.c | 118 +++++++++++++++++---------------------------- 2 files changed, 45 insertions(+), 74 deletions(-) diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index 94c6a18..12bbcf3 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -60,6 +60,7 @@ enum cpuhp_state { CPUHP_BLK_MQ_PREPARE, CPUHP_NET_FLOW_PREPARE, CPUHP_TOPOLOGY_PREPARE, + CPUHP_NET_IUCV_PREPARE, CPUHP_TIMERS_DEAD, CPUHP_NOTF_ERR_INJ_PREPARE, CPUHP_MIPS_SOC_PREPARE, diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c index 88a2a3b..f0d6afc 100644 --- a/net/iucv/iucv.c +++ b/net/iucv/iucv.c @@ -639,7 +639,7 @@ static void iucv_disable(void) put_online_cpus(); } -static void free_iucv_data(int cpu) +static int iucv_cpu_dead(unsigned int cpu) { kfree(iucv_param_irq[cpu]); iucv_param_irq[cpu] = NULL; @@ -647,9 +647,10 @@ static void free_iucv_data(int cpu) iucv_param[cpu] = NULL; kfree(iucv_irq_data[cpu]); iucv_irq_data[cpu] = NULL; + return 0; } -static int alloc_iucv_data(int cpu) +static int iucv_cpu_prepare(unsigned int cpu) { /* Note: GFP_DMA used to get memory below 2G */ iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data), @@ -671,58 +672,38 @@ static int alloc_iucv_data(int cpu) return 0; out_free: - free_iucv_data(cpu); + iucv_cpu_dead(cpu); return -ENOMEM; } -static int iucv_cpu_notify(struct notifier_block *self, - unsigned long action, void *hcpu) +static int iucv_cpu_online(unsigned int cpu) { - cpumask_t cpumask; - long cpu = (long) hcpu; - - switch (action) { - case CPU_UP_PREPARE: - case CPU_UP_PREPARE_FROZEN: - if (alloc_iucv_data(cpu)) - return notifier_from_errno(-ENOMEM); - break; - case CPU_UP_CANCELED: - case CPU_UP_CANCELED_FROZEN: - case CPU_DEAD: - case CPU_DEAD_FROZEN: - free_iucv_data(cpu); - break; - case CPU_ONLINE: - case CPU_ONLINE_FROZEN: - case CPU_DOWN_FAILED: - case CPU_DOWN_FAILED_FROZEN: - if (!iucv_path_table) - break; - smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); - break; - case CPU_DOWN_PREPARE: - case CPU_DOWN_PREPARE_FROZEN: - if (!iucv_path_table) - break; - cpumask_copy(&cpumask, &iucv_buffer_cpumask); - cpumask_clear_cpu(cpu, &cpumask); - if (cpumask_empty(&cpumask)) - /* Can't offline last IUCV enabled cpu. */ - return notifier_from_errno(-EINVAL); - smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1); - if (cpumask_empty(&iucv_irq_cpumask)) - smp_call_function_single( - cpumask_first(&iucv_buffer_cpumask), - iucv_allow_cpu, NULL, 1); - break; - } - return NOTIFY_OK; + if (!iucv_path_table) + return 0; + iucv_declare_cpu(NULL); + return 0; } -static struct notifier_block __refdata iucv_cpu_notifier = { - .notifier_call = iucv_cpu_notify, -}; +static int iucv_cpu_down_prep(unsigned int cpu) +{ + cpumask_t cpumask; + + if (!iucv_path_table) + return 0; + + cpumask_copy(&cpumask, &iucv_buffer_cpumask); + cpumask_clear_cpu(cpu, &cpumask); + if (cpumask_empty(&cpumask)) + /* Can't offline last IUCV enabled cpu. */ + return -EINVAL; + + iucv_retrieve_cpu(NULL); + if (!cpumask_empty(&iucv_irq_cpumask)) + return 0; + smp_call_function_single(cpumask_first(&iucv_buffer_cpumask), + iucv_allow_cpu, NULL, 1); + return 0; +} /** * iucv_sever_pathid @@ -2027,6 +2008,7 @@ struct iucv_interface iucv_if = { }; EXPORT_SYMBOL(iucv_if); +static enum cpuhp_state iucv_online; /** * iucv_init * @@ -2035,7 +2017,6 @@ EXPORT_SYMBOL(iucv_if); static int __init iucv_init(void) { int rc; - int cpu; if (!MACHINE_IS_VM) { rc = -EPROTONOSUPPORT; @@ -2054,23 +2035,19 @@ static int __init iucv_init(void) goto out_int; } - cpu_notifier_register_begin(); - - for_each_online_cpu(cpu) { - if (alloc_iucv_data(cpu)) { - rc = -ENOMEM; - goto out_free; - } - } - rc = __register_hotcpu_notifier(&iucv_cpu_notifier); + rc = cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE, "net/iucv:prepare", + iucv_cpu_prepare, iucv_cpu_dead); if (rc) goto out_free; - - cpu_notifier_register_done(); + rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "net/iucv:online", + iucv_cpu_online, iucv_cpu_down_prep); + if (rc < 0) + goto out_free; + iucv_online = rc; rc = register_reboot_notifier(&iucv_reboot_notifier); if (rc) - goto out_cpu; + goto out_free; ASCEBC(iucv_error_no_listener, 16); ASCEBC(iucv_error_no_memory, 16); ASCEBC(iucv_error_pathid, 16); @@ -2084,14 +2061,10 @@ static int __init iucv_init(void) out_reboot: unregister_reboot_notifier(&iucv_reboot_notifier); -out_cpu: - cpu_notifier_register_begin(); - __unregister_hotcpu_notifier(&iucv_cpu_notifier); out_free: - for_each_possible_cpu(cpu) - free_iucv_data(cpu); - - cpu_notifier_register_done(); + if (iucv_online) + cpuhp_remove_state(iucv_online); + cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE); root_device_unregister(iucv_root); out_int: @@ -2110,7 +2083,6 @@ out: static void __exit iucv_exit(void) { struct iucv_irq_list *p, *n; - int cpu; spin_lock_irq(&iucv_queue_lock); list_for_each_entry_safe(p, n, &iucv_task_queue, list) @@ -2119,11 +2091,9 @@ static void __exit iucv_exit(void) kfree(p); spin_unlock_irq(&iucv_queue_lock); unregister_reboot_notifier(&iucv_reboot_notifier); - cpu_notifier_register_begin(); - __unregister_hotcpu_notifier(&iucv_cpu_notifier); - for_each_possible_cpu(cpu) - free_iucv_data(cpu); - cpu_notifier_register_done(); + + cpuhp_remove_state_nocalls(iucv_online); + cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE); root_device_unregister(iucv_root); bus_unregister(&iucv_bus); unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);