[PATCH V2 3/3] powerpc: Disable VPHN polling during a suspend operation

[Jesse Larrew]

From: Jesse Larrew <jlar...@linux.vnet.ibm.com>

Tie the polling mechanism into the ibm,suspend-me rtas call to
stop/restart polling before/after a suspend, hibernate, migrate,
or checkpoint restart operation. This ensures that the system has a
chance to disable the polling if the partition is migrated to a system
that does not support VPHN (and vice versa).

Signed-off-by: Jesse Larrew <jlar...@linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/topology.h |   10 ++++++++++
 arch/powerpc/kernel/rtas.c          |    3 +++
 2 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/topology.h 
b/arch/powerpc/include/asm/topology.h
index afe4aaa..aed188b 100644
--- a/arch/powerpc/include/asm/topology.h
+++ b/arch/powerpc/include/asm/topology.h
@@ -93,6 +93,8 @@ extern void __init dump_numa_cpu_topology(void);
 extern int sysfs_add_device_to_node(struct sys_device *dev, int nid);
 extern void sysfs_remove_device_from_node(struct sys_device *dev, int nid);
 
+extern int start_topology_update(void);
+extern int stop_topology_update(void);
 #else
 
 static inline void dump_numa_cpu_topology(void) {}
@@ -107,6 +109,14 @@ static inline void sysfs_remove_device_from_node(struct 
sys_device *dev,
 {
 }
 
+static inline int start_topology_update(void)
+{
+       return 0;
+}
+static inline int stop_topology_update(void)
+{
+       return 0;
+}
 #endif /* CONFIG_NUMA */
 
 #include <asm-generic/topology.h>
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index 8fe8bc6..2097f2b 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -41,6 +41,7 @@
 #include <asm/atomic.h>
 #include <asm/time.h>
 #include <asm/mmu.h>
+#include <asm/topology.h>
 
 struct rtas_t rtas = {
        .lock = __ARCH_SPIN_LOCK_UNLOCKED
@@ -713,6 +714,7 @@ static int __rtas_suspend_last_cpu(struct 
rtas_suspend_me_data *data, int wake_w
        int cpu;
 
        slb_set_size(SLB_MIN_SIZE);
+       stop_topology_update();
        printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", 
smp_processor_id());
 
        while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) &&
@@ -728,6 +730,7 @@ static int __rtas_suspend_last_cpu(struct 
rtas_suspend_me_data *data, int wake_w
                rc = atomic_read(&data->error);
 
        atomic_set(&data->error, rc);
+       start_topology_update();
 
        if (wake_when_done) {
                atomic_set(&data->done, 1);
-- 
1.7.2.3

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