powerpc/pseries: Migration code reorganization / hibernation prep

Partition hibernation will use some of the same code as is
currently used for Live Partition Migration. This function
further abstracts this code such that code outside of rtas.c
can utilize it. It also changes the error field in the suspend
me data structure to be an atomic type, since it is set and
checked on different cpus without any barriers or locking.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h
index 20de73c36682..8941c54b30ea 100644
--- a/arch/powerpc/include/asm/rtas.h
+++ b/arch/powerpc/include/asm/rtas.h
@@ -63,6 +63,14 @@ struct rtas_t {
         struct device_node *dev;        /* virtual address pointer */
 };
 
+struct rtas_suspend_me_data {
+        atomic_t working; /* number of cpus accessing this struct */
+        atomic_t done;
+        int token; /* ibm,suspend-me */
+        atomic_t error;
+        struct completion *complete; /* wait on this until working == 0 */
+};
+
 /* RTAS event classes */
 #define RTAS_INTERNAL_ERROR             0x80000000 /* set bit 0 */
 #define RTAS_EPOW_WARNING               0x40000000 /* set bit 1 */
@@ -174,6 +182,8 @@ extern int rtas_set_indicator(int indicator, int index, int new_value);
 extern int rtas_set_indicator_fast(int indicator, int index, int new_value);
 extern void rtas_progress(char *s, unsigned short hex);
 extern void rtas_initialize(void);
+extern int rtas_suspend_cpu(struct rtas_suspend_me_data *data);
+extern int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data);
 
 struct rtc_time;
 extern unsigned long rtas_get_boot_time(void);