diff options
Diffstat (limited to 'kernel/time/timer_migration.h')
| -rw-r--r-- | kernel/time/timer_migration.h | 59 |
1 files changed, 38 insertions, 21 deletions
diff --git a/kernel/time/timer_migration.h b/kernel/time/timer_migration.h index 154accc7a543..31735dd52327 100644 --- a/kernel/time/timer_migration.h +++ b/kernel/time/timer_migration.h @@ -6,6 +6,24 @@ #define TMIGR_CHILDREN_PER_GROUP 8 /** + * struct tmigr_hierarchy - a hierarchy associated to a given CPU capacity. + * Homogeneous systems have only one hierarchy. + * Heterogenous have one hierarchy per CPU capacity. + * @cpumask: CPUs belonging to this hierarchy + * @root: The current root of the hierarchy + * @capacity: CPU capacity associated to this hierarchy + * @node: Node in the global hierarchy list + * @level_list: Per level lists of tmigr groups + */ +struct tmigr_hierarchy { + struct cpumask *cpumask; + struct tmigr_group *root; + unsigned long capacity; + struct list_head node; + struct list_head level_list[]; +}; + +/** * struct tmigr_event - a timer event associated to a CPU * @nextevt: The node to enqueue an event in the parent group queue * @cpu: The CPU to which this event belongs @@ -75,15 +93,17 @@ struct tmigr_group { /** * struct tmigr_cpu - timer migration per CPU group * @lock: Lock protecting the tmigr_cpu group information - * @online: Indicates whether the CPU is online; In deactivate path - * it is required to know whether the migrator in the top - * level group is to be set offline, while a timer is - * pending. Then another online CPU needs to be notified to - * take over the migrator role. Furthermore the information - * is required in CPU hotplug path as the CPU is able to go - * idle before the timer migration hierarchy hotplug AP is - * reached. During this phase, the CPU has to handle the + * @available: Indicates whether the CPU is available for handling + * global timers. In the deactivate path it is required to + * know whether the migrator in the top level group is to + * be set offline, while a timer is pending. Then another + * available CPU needs to be notified to take over the + * migrator role. Furthermore the information is required + * in the CPU hotplug path as the CPU is able to go idle + * before the timer migration hierarchy hotplug callback is + * reached. During this phase, the CPU has to handle the * global timers on its own and must not act as a migrator. + * @idle: Indicates whether the CPU is idle in the timer migration * hierarchy * @remote: Is set when timers of the CPU are expired remotely @@ -97,7 +117,7 @@ struct tmigr_group { */ struct tmigr_cpu { raw_spinlock_t lock; - bool online; + bool available; bool idle; bool remote; struct tmigr_group *tmgroup; @@ -110,22 +130,19 @@ struct tmigr_cpu { * union tmigr_state - state of tmigr_group * @state: Combined version of the state - only used for atomic * read/cmpxchg function - * @struct: Split version of the state - only use the struct members to + * &anon struct: Split version of the state - only use the struct members to * update information to stay independent of endianness + * @active: Contains each mask bit of the active children + * @migrator: Contains mask of the child which is migrator + * @seq: Sequence counter needs to be increased when an update + * to the tmigr_state is done. It prevents a race when + * updates in the child groups are propagated in changed + * order. Detailed information about the scenario is + * given in the documentation at the begin of + * timer_migration.c. */ union tmigr_state { u32 state; - /** - * struct - split state of tmigr_group - * @active: Contains each mask bit of the active children - * @migrator: Contains mask of the child which is migrator - * @seq: Sequence counter needs to be increased when an update - * to the tmigr_state is done. It prevents a race when - * updates in the child groups are propagated in changed - * order. Detailed information about the scenario is - * given in the documentation at the begin of - * timer_migration.c. - */ struct { u8 active; u8 migrator; |