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authorAnna-Maria Gleixner <anna-maria@linutronix.de>2016-12-21 20:19:52 +0100
committerThomas Gleixner <tglx@linutronix.de>2016-12-25 10:47:43 +0100
commit7b737965b33188bd3dbb44e938535c4006d97fbb (patch)
treebdac8e4ce520c971f6adf879099c8378329a40a2
parentscsi/bnx2i: Convert to hotplug state machine (diff)
downloadlinux-dev-7b737965b33188bd3dbb44e938535c4006d97fbb.tar.xz
linux-dev-7b737965b33188bd3dbb44e938535c4006d97fbb.zip
staging/lustre/libcfs: Convert to hotplug state machine
Install the callbacks via the state machine. No functional change. Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: devel@driverdev.osuosl.org Cc: Andreas Dilger <andreas.dilger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Oleg Drokin <oleg.drokin@intel.com> Cc: rt@linutronix.de Cc: lustre-devel@lists.lustre.org Link: http://lkml.kernel.org/r/20161202110027.htzzeervzkoc4muv@linutronix.de Link: http://lkml.kernel.org/r/20161221192111.922872524@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c85
-rw-r--r--include/linux/cpuhotplug.h1
2 files changed, 46 insertions, 40 deletions
diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c
index 6b9cf06e8df2..427e2198bb9e 100644
--- a/drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c
+++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c
@@ -967,48 +967,38 @@ cfs_cpt_table_create_pattern(char *pattern)
}
#ifdef CONFIG_HOTPLUG_CPU
-static int
-cfs_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
-{
- unsigned int cpu = (unsigned long)hcpu;
- bool warn;
-
- switch (action) {
- case CPU_DEAD:
- case CPU_DEAD_FROZEN:
- case CPU_ONLINE:
- case CPU_ONLINE_FROZEN:
- spin_lock(&cpt_data.cpt_lock);
- cpt_data.cpt_version++;
- spin_unlock(&cpt_data.cpt_lock);
- /* Fall through */
- default:
- if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) {
- CDEBUG(D_INFO, "CPU changed [cpu %u action %lx]\n",
- cpu, action);
- break;
- }
+static enum cpuhp_state lustre_cpu_online;
- mutex_lock(&cpt_data.cpt_mutex);
- /* if all HTs in a core are offline, it may break affinity */
- cpumask_copy(cpt_data.cpt_cpumask,
- topology_sibling_cpumask(cpu));
- warn = cpumask_any_and(cpt_data.cpt_cpumask,
- cpu_online_mask) >= nr_cpu_ids;
- mutex_unlock(&cpt_data.cpt_mutex);
- CDEBUG(warn ? D_WARNING : D_INFO,
- "Lustre: can't support CPU plug-out well now, performance and stability could be impacted [CPU %u action: %lx]\n",
- cpu, action);
- }
+static void cfs_cpu_incr_cpt_version(void)
+{
+ spin_lock(&cpt_data.cpt_lock);
+ cpt_data.cpt_version++;
+ spin_unlock(&cpt_data.cpt_lock);
+}
- return NOTIFY_OK;
+static int cfs_cpu_online(unsigned int cpu)
+{
+ cfs_cpu_incr_cpt_version();
+ return 0;
}
-static struct notifier_block cfs_cpu_notifier = {
- .notifier_call = cfs_cpu_notify,
- .priority = 0
-};
+static int cfs_cpu_dead(unsigned int cpu)
+{
+ bool warn;
+
+ cfs_cpu_incr_cpt_version();
+ mutex_lock(&cpt_data.cpt_mutex);
+ /* if all HTs in a core are offline, it may break affinity */
+ cpumask_copy(cpt_data.cpt_cpumask, topology_sibling_cpumask(cpu));
+ warn = cpumask_any_and(cpt_data.cpt_cpumask,
+ cpu_online_mask) >= nr_cpu_ids;
+ mutex_unlock(&cpt_data.cpt_mutex);
+ CDEBUG(warn ? D_WARNING : D_INFO,
+ "Lustre: can't support CPU plug-out well now, performance and stability could be impacted [CPU %u]\n",
+ cpu);
+ return 0;
+}
#endif
void
@@ -1018,7 +1008,9 @@ cfs_cpu_fini(void)
cfs_cpt_table_free(cfs_cpt_table);
#ifdef CONFIG_HOTPLUG_CPU
- unregister_hotcpu_notifier(&cfs_cpu_notifier);
+ if (lustre_cpu_online > 0)
+ cpuhp_remove_state_nocalls(lustre_cpu_online);
+ cpuhp_remove_state_nocalls(CPUHP_LUSTRE_CFS_DEAD);
#endif
if (cpt_data.cpt_cpumask)
LIBCFS_FREE(cpt_data.cpt_cpumask, cpumask_size());
@@ -1027,6 +1019,8 @@ cfs_cpu_fini(void)
int
cfs_cpu_init(void)
{
+ int ret = 0;
+
LASSERT(!cfs_cpt_table);
memset(&cpt_data, 0, sizeof(cpt_data));
@@ -1041,8 +1035,19 @@ cfs_cpu_init(void)
mutex_init(&cpt_data.cpt_mutex);
#ifdef CONFIG_HOTPLUG_CPU
- register_hotcpu_notifier(&cfs_cpu_notifier);
+ ret = cpuhp_setup_state_nocalls(CPUHP_LUSTRE_CFS_DEAD,
+ "staging/lustre/cfe:dead", NULL,
+ cfs_cpu_dead);
+ if (ret < 0)
+ goto failed;
+ ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
+ "staging/lustre/cfe:online",
+ cfs_cpu_online, NULL);
+ if (ret < 0)
+ goto failed;
+ lustre_cpu_online = ret;
#endif
+ ret = -EINVAL;
if (*cpu_pattern) {
cfs_cpt_table = cfs_cpt_table_create_pattern(cpu_pattern);
@@ -1075,7 +1080,7 @@ cfs_cpu_init(void)
failed:
cfs_cpu_fini();
- return -1;
+ return ret;
}
#endif
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index fc4587c05dd3..175d276ac335 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -41,6 +41,7 @@ enum cpuhp_state {
CPUHP_NET_DEV_DEAD,
CPUHP_PCI_XGENE_DEAD,
CPUHP_IOMMU_INTEL_DEAD,
+ CPUHP_LUSTRE_CFS_DEAD,
CPUHP_SCSI_BNX2FC_DEAD,
CPUHP_SCSI_BNX2I_DEAD,
CPUHP_WORKQUEUE_PREP,