Add reservation creation API to plugin interface & syscalls

3 files changed, 31 insertions, 0 deletions

diff --git a/include/litmus/sched_plugin.h b/include/litmus/sched_plugin.h
index b2bc8b5a5e71..85383aa67da7 100644
--- a/include/litmus/sched_plugin.h
+++ b/include/litmus/sched_plugin.h
@@ -103,6 +103,10 @@ typedef void (*synchronous_release_at_t)(lt_t time_zero);
  * reservation-specific values. */
 typedef void (*current_budget_t)(lt_t *used_so_far, lt_t *remaining);
 
+/* Reservation creation/removal backends. Meaning of reservation_type and
+ * reservation_id are entirely plugin-specific. */
+typedef long (*reservation_create_t)(int reservation_type, void* __user config);
+typedef long (*reservation_destroy_t)(unsigned int reservation_id, int cpu);
 
 /************************ misc routines ***********************/
 
@@ -144,6 +148,10 @@ struct sched_plugin {
 
         current_budget_t        current_budget;
 
+        /* Reservation support */
+        reservation_create_t    reservation_create;
+        reservation_destroy_t   reservation_destroy;
+
 #ifdef CONFIG_LITMUS_LOCKING
         /*      locking protocols       */
         allocate_lock_t         allocate_lock;
diff --git a/litmus/litmus.c b/litmus/litmus.c
index ed739082af5b..ed8e4127207e 100644
--- a/litmus/litmus.c
+++ b/litmus/litmus.c
@@ -317,6 +317,16 @@ asmlinkage long sys_null_call(cycles_t __user *ts)
         return ret;
 }
 
+asmlinkage long sys_reservation_create(int type, void __user *config)
+{
+        return litmus->reservation_create(type, config);
+}
+
+asmlinkage long sys_reservation_destroy(unsigned int reservation_id, int cpu)
+{
+        return litmus->reservation_destroy(reservation_id, cpu);
+}
+
 /* p is a real-time task. Re-init its state as a best-effort task. */
 static void reinit_litmus_state(struct task_struct* p, int restore)
 {
diff --git a/litmus/sched_plugin.c b/litmus/sched_plugin.c
index a9fe3f5e7349..4b4e1adc1a9a 100644
--- a/litmus/sched_plugin.c
+++ b/litmus/sched_plugin.c
@@ -153,6 +153,17 @@ static long litmus_dummy_allocate_lock(struct litmus_lock **lock, int type,
 
 #endif
 
+static long  litmus_dummy_reservation_create(
+        int reservation_type,
+        void* __user config)
+{
+        return -ENOSYS;
+}
+
+static long litmus_dummy_reservation_destroy(unsigned int reservation_id, int cpu)
+{
+        return -ENOSYS;
+}
 
 /* The default scheduler plugin. It doesn't do anything and lets Linux do its
  * job.
@@ -218,6 +229,8 @@ int register_sched_plugin(struct sched_plugin* plugin)
         CHECK(admit_task);
         CHECK(fork_task);
         CHECK(synchronous_release_at);
+        CHECK(reservation_destroy);
+        CHECK(reservation_create);
 
         if (!plugin->wait_for_release_at)
                 plugin->wait_for_release_at = default_wait_for_release_at;