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authorRafael J. Wysocki <rjw@sisk.pl>2007-05-09 13:35:10 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-09 23:30:56 +0400
commit8bb7844286fb8c9fce6f65d8288aeb09d03a5e0d (patch)
treef4e305edaedbde05774bb1e4acd89a9475661d2e /drivers
parentf37bc2712b54ec641e0c0c8634f1a4b61d9956c0 (diff)
downloadlinux-8bb7844286fb8c9fce6f65d8288aeb09d03a5e0d.tar.xz
Add suspend-related notifications for CPU hotplug
Since nonboot CPUs are now disabled after tasks and devices have been frozen and the CPU hotplug infrastructure is used for this purpose, we need special CPU hotplug notifications that will help the CPU-hotplug-aware subsystems distinguish normal CPU hotplug events from CPU hotplug events related to a system-wide suspend or resume operation in progress. This patch introduces such notifications and causes them to be used during suspend and resume transitions. It also changes all of the CPU-hotplug-aware subsystems to take these notifications into consideration (for now they are handled in the same way as the corresponding "normal" ones). [oleg@tv-sign.ru: cleanups] Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Cc: Gautham R Shenoy <ego@in.ibm.com> Cc: Pavel Machek <pavel@ucw.cz> Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/base/topology.c3
-rw-r--r--drivers/cpufreq/cpufreq.c3
-rw-r--r--drivers/cpufreq/cpufreq_stats.c2
-rw-r--r--drivers/hwmon/coretemp.c2
-rw-r--r--drivers/infiniband/hw/ehca/ehca_irq.c6
-rw-r--r--drivers/kvm/kvm_main.c3
6 files changed, 19 insertions, 0 deletions
diff --git a/drivers/base/topology.c b/drivers/base/topology.c
index 067a9e8bc377..8d8cdfec6529 100644
--- a/drivers/base/topology.c
+++ b/drivers/base/topology.c
@@ -126,10 +126,13 @@ static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
switch (action) {
case CPU_UP_PREPARE:
+ case CPU_UP_PREPARE_FROZEN:
rc = topology_add_dev(cpu);
break;
case CPU_UP_CANCELED:
+ case CPU_UP_CANCELED_FROZEN:
case CPU_DEAD:
+ case CPU_DEAD_FROZEN:
topology_remove_dev(cpu);
break;
}
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 893dbaf386fb..eb37fba9b7ef 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1685,9 +1685,11 @@ static int cpufreq_cpu_callback(struct notifier_block *nfb,
if (sys_dev) {
switch (action) {
case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
cpufreq_add_dev(sys_dev);
break;
case CPU_DOWN_PREPARE:
+ case CPU_DOWN_PREPARE_FROZEN:
if (unlikely(lock_policy_rwsem_write(cpu)))
BUG();
@@ -1699,6 +1701,7 @@ static int cpufreq_cpu_callback(struct notifier_block *nfb,
__cpufreq_remove_dev(sys_dev);
break;
case CPU_DOWN_FAILED:
+ case CPU_DOWN_FAILED_FROZEN:
cpufreq_add_dev(sys_dev);
break;
}
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index d1c7cac9316c..d2f0cbd8b8f3 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -313,9 +313,11 @@ static int cpufreq_stat_cpu_callback(struct notifier_block *nfb,
switch (action) {
case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
cpufreq_update_policy(cpu);
break;
case CPU_DEAD:
+ case CPU_DEAD_FROZEN:
cpufreq_stats_free_table(cpu);
break;
}
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 03b1f650d1c4..75e3911810a3 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -309,9 +309,11 @@ static int coretemp_cpu_callback(struct notifier_block *nfb,
switch (action) {
case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
coretemp_device_add(cpu);
break;
case CPU_DEAD:
+ case CPU_DEAD_FROZEN:
coretemp_device_remove(cpu);
break;
}
diff --git a/drivers/infiniband/hw/ehca/ehca_irq.c b/drivers/infiniband/hw/ehca/ehca_irq.c
index f284be1c9166..82dda2faf4d0 100644
--- a/drivers/infiniband/hw/ehca/ehca_irq.c
+++ b/drivers/infiniband/hw/ehca/ehca_irq.c
@@ -745,6 +745,7 @@ static int comp_pool_callback(struct notifier_block *nfb,
switch (action) {
case CPU_UP_PREPARE:
+ case CPU_UP_PREPARE_FROZEN:
ehca_gen_dbg("CPU: %x (CPU_PREPARE)", cpu);
if(!create_comp_task(pool, cpu)) {
ehca_gen_err("Can't create comp_task for cpu: %x", cpu);
@@ -752,24 +753,29 @@ static int comp_pool_callback(struct notifier_block *nfb,
}
break;
case CPU_UP_CANCELED:
+ case CPU_UP_CANCELED_FROZEN:
ehca_gen_dbg("CPU: %x (CPU_CANCELED)", cpu);
cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
kthread_bind(cct->task, any_online_cpu(cpu_online_map));
destroy_comp_task(pool, cpu);
break;
case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
ehca_gen_dbg("CPU: %x (CPU_ONLINE)", cpu);
cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
kthread_bind(cct->task, cpu);
wake_up_process(cct->task);
break;
case CPU_DOWN_PREPARE:
+ case CPU_DOWN_PREPARE_FROZEN:
ehca_gen_dbg("CPU: %x (CPU_DOWN_PREPARE)", cpu);
break;
case CPU_DOWN_FAILED:
+ case CPU_DOWN_FAILED_FROZEN:
ehca_gen_dbg("CPU: %x (CPU_DOWN_FAILED)", cpu);
break;
case CPU_DEAD:
+ case CPU_DEAD_FROZEN:
ehca_gen_dbg("CPU: %x (CPU_DEAD)", cpu);
destroy_comp_task(pool, cpu);
take_over_work(pool, cpu);
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index c8b8cfa332bb..0d892600ff00 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -2889,7 +2889,9 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
switch (val) {
case CPU_DOWN_PREPARE:
+ case CPU_DOWN_PREPARE_FROZEN:
case CPU_UP_CANCELED:
+ case CPU_UP_CANCELED_FROZEN:
printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
cpu);
decache_vcpus_on_cpu(cpu);
@@ -2897,6 +2899,7 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
NULL, 0, 1);
break;
case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
cpu);
smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,