sched_plgn: Add fn. for reporting CPU/cluster maps

This patch adds the plugin interface "get_domain_proc_info()".
Plugins use this function to report their cpu/clustering configuration
to the user via /proc/litmus/domains and /proc/litmus/cpus.

2 files changed, 14 insertions, 0 deletions

diff --git a/include/litmus/sched_plugin.h b/include/litmus/sched_plugin.h
index 0f2fe90123db..f173dca7cd65 100644
--- a/include/litmus/sched_plugin.h
+++ b/include/litmus/sched_plugin.h
@@ -16,6 +16,8 @@
 typedef long (*activate_plugin_t) (void);
 typedef long (*deactivate_plugin_t) (void);
 
+struct domain_proc_info;
+typedef long (*get_domain_proc_info_t) (struct domain_proc_info **info);
 
 
 /********************* scheduler invocation ******************/
@@ -69,6 +71,9 @@ typedef long (*admit_task_t)(struct task_struct* tsk);
 
 typedef void (*release_at_t)(struct task_struct *t, lt_t start);
 
+/************************ misc routines ***********************/
+
+
 struct sched_plugin {
         struct list_head        list;
         /*      basic info              */
@@ -77,6 +82,7 @@ struct sched_plugin {
         /*      setup                   */
         activate_plugin_t       activate_plugin;
         deactivate_plugin_t     deactivate_plugin;
+        get_domain_proc_info_t  get_domain_proc_info;
 
         /*      scheduler invocation    */
         scheduler_tick_t        tick;
diff --git a/litmus/sched_plugin.c b/litmus/sched_plugin.c
index c4747e0ef2ab..592489629105 100644
--- a/litmus/sched_plugin.c
+++ b/litmus/sched_plugin.c
@@ -111,6 +111,12 @@ static long litmus_dummy_deactivate_plugin(void)
         return 0;
 }
 
+static long litmus_dummy_get_domain_proc_info(struct domain_proc_info **d)
+{
+        *d = NULL;
+        return 0;
+}
+
 #ifdef CONFIG_LITMUS_LOCKING
 
 static long litmus_dummy_allocate_lock(struct litmus_lock **lock, int type,
@@ -137,6 +143,7 @@ struct sched_plugin linux_sched_plugin = {
         .finish_switch = litmus_dummy_finish_switch,
         .activate_plugin = litmus_dummy_activate_plugin,
         .deactivate_plugin = litmus_dummy_deactivate_plugin,
+        .get_domain_proc_info = litmus_dummy_get_domain_proc_info,
 #ifdef CONFIG_LITMUS_LOCKING
         .allocate_lock = litmus_dummy_allocate_lock,
 #endif
@@ -175,6 +182,7 @@ int register_sched_plugin(struct sched_plugin* plugin)
         CHECK(complete_job);
         CHECK(activate_plugin);
         CHECK(deactivate_plugin);
+        CHECK(get_domain_proc_info);
 #ifdef CONFIG_LITMUS_LOCKING
         CHECK(allocate_lock);
 #endif