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net/iucv: Convert to hotplug state machine

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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 <bigeasy@linutronix.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-s390@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: Ursula Braun <ubraun@linux.vnet.ibm.com>
Cc: rt@linuxtronix.de
Link: http://lkml.kernel.org/r/20161117183541.8588-13-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-11-17 19:35:33 +01:00 committed by Thomas Gleixner
parent 948b9c60cb
commit 38b482929e
2 changed files with 45 additions and 74 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/cpuhotplug.h
View File

@ -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,

118
net/iucv/iucv.c
View File

@ -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 @@ static int __init iucv_init(void)
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);