WIP: schedule: limit user-LL to core0

Multiple temporary limitations to limit user LL scheduler to only
work on core 0. This is mostly related to privileged cpu_get_id()
that is used in many places to check the id of the core code is
running on. This is not available to user-space at the moment, so
temporary measures are needed.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Author: kv2019i

src/schedule/zephyr_domain.c

@@ -294,7 +294,7 @@ static int zephyr_domain_register_user(struct ll_schedule_domain *domain,
 				       void (*handler)(void *arg), void *arg)
 {
 	struct zephyr_domain *zephyr_domain = ll_sch_domain_get_pdata(domain);
-	int core = cpu_get_id();
+	int core = 0; /* cpu_get_id(); */
 	struct zephyr_domain_thread *dt = zephyr_domain->domain_thread + core;
 	char thread_name[] = "ll_thread0";
 	k_tid_t thread;
@@ -407,7 +407,7 @@ static int zephyr_domain_unregister_user(struct ll_schedule_domain *domain,
 struct k_thread *zephyr_domain_thread_tid(struct ll_schedule_domain *domain)
 {
 	struct zephyr_domain *zephyr_domain = ll_sch_domain_get_pdata(domain);
-	int core = cpu_get_id();
+	int core = 0; /* cpu_get_id(); */
 	struct zephyr_domain_thread *dt = zephyr_domain->domain_thread + core;
 
 	tr_dbg(&ll_tr, "entry");

zephyr/schedule.c

@@ -21,6 +21,11 @@ static struct schedulers *_schedulers[CONFIG_CORE_COUNT];
  */
 struct schedulers **arch_schedulers_get(void)
 {
+	if (k_is_user_context()) {
+		printk("FIXME: using core0 scheduler\n");
+		return _schedulers;
+	}
+
 	return _schedulers + cpu_get_id();
 }
 EXPORT_SYMBOL(arch_schedulers_get);