Preserve PSCI cpu_suspend 'power_state' parameter.
This patch saves the 'power_state' parameter prior to suspending
a cpu and invalidates it upon its resumption. The 'affinity level'
and 'state id' fields of this parameter can be read using a set of
public and private apis. Validation of power state parameter is
introduced which checks for SBZ bits are zero.
This change also takes care of flushing the parameter from the cache
to main memory. This ensures that it is available after cpu reset
when the caches and mmu are turned off. The earlier support for
saving only the 'affinity level' field of the 'power_state' parameter
has also been reworked.
Fixes ARM-Software/tf-issues#26
Fixes ARM-Software/tf-issues#130
Change-Id: Ic007ccb5e39bf01e0b67390565d3b4be33f5960a
diff --git a/services/std_svc/psci/psci_private.h b/services/std_svc/psci/psci_private.h
index 2d9d12b..8cb3aab 100644
--- a/services/std_svc/psci/psci_private.h
+++ b/services/std_svc/psci/psci_private.h
@@ -74,10 +74,8 @@
* across cpu_suspend calls which enter the power down state.
******************************************************************************/
typedef struct {
- /* Align the suspend level to allow per-cpu lockless access */
- int suspend_level
- __attribute__((__aligned__(CACHE_WRITEBACK_GRANULE)));
-} suspend_context;
+ unsigned int power_state;
+} __aligned(CACHE_WRITEBACK_GRANULE) suspend_context;
typedef aff_map_node (*mpidr_aff_map_nodes[MPIDR_MAX_AFFLVL]);
typedef unsigned int (*afflvl_power_on_finisher)(unsigned long,
@@ -147,8 +145,9 @@
extern int psci_afflvl_off(unsigned long, int, int);
/* Private exported functions from psci_affinity_suspend.c */
-extern void psci_set_suspend_afflvl(aff_map_node *node, int afflvl);
-extern int psci_get_suspend_afflvl(aff_map_node *node);
+extern void psci_set_suspend_power_state(aff_map_node *node,
+ unsigned int power_state);
+extern int psci_get_aff_map_node_suspend_afflvl(aff_map_node *node);
extern int psci_afflvl_suspend(unsigned long,
unsigned long,
unsigned long,