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authorJesse Larrew <jlarrew@linux.vnet.ibm.com>2010-12-01 12:31:26 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-12-09 15:36:30 +1100
commit3b7a27db3b6b5501e3d1c1628e6d5a547ffe76c6 (patch)
treee30f3b6449ede133a03a56d8e57a82751ce3dbdc /arch/powerpc
parent9eff1a38407c051273fe1a20f03f8155bd32de35 (diff)
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powerpc: Disable VPHN polling during a suspend operation
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 <jlarrew@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/include/asm/topology.h10
-rw-r--r--arch/powerpc/kernel/rtas.c3
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);