schedule: ll: allocate semaphores only for used cores

Instead of allocating semaphores during global initialisation, do
that later when initialising the domain for specific cores. This
also automatically grants access rights to the allocating thread.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

src/schedule/zephyr_domain.c

@@ -319,6 +319,12 @@ static int zephyr_domain_thread_init(struct ll_schedule_domain *domain,
 	dt->handler = NULL;
 	dt->arg = NULL;
 
+	dt->sem = k_object_alloc(K_OBJ_SEM);
+	if (!dt->sem) {
+		tr_err(&ll_tr, "Failed to allocate semaphore for core %d", core);
+		return -ENOMEM;
+	}
+
 	/* 10 is rather random, we better not accumulate 10 missed timer interrupts */
 	k_sem_init(dt->sem, 0, 10);
 
@@ -328,6 +334,8 @@ static int zephyr_domain_thread_init(struct ll_schedule_domain *domain,
 	dt->ll_thread = k_object_alloc(K_OBJ_THREAD);
 	if (!dt->ll_thread) {
 		tr_err(&ll_tr, "Failed to allocate thread object for core %d", core);
+		k_object_free(dt->sem);
+		dt->sem = NULL;
 		return -ENOMEM;
 	}
 
@@ -473,6 +481,11 @@ static void zephyr_domain_thread_free(struct ll_schedule_domain *domain,
 		dt->ll_thread = NULL;
 	}
 
+	if (dt->sem) {
+		k_object_free(dt->sem);
+		dt->sem = NULL;
+	}
+
 	tr_info(&ll_tr, "thread_free done, core %d", core);
 }
 
@@ -530,11 +543,11 @@ APP_TASK_DATA static const struct ll_schedule_domain_ops zephyr_domain_ops = {
 #endif
 };
 
+/* Core 0 only */
 struct ll_schedule_domain *zephyr_domain_init(int clk)
 {
 	struct ll_schedule_domain *domain;
 	struct zephyr_domain *zephyr_domain;
-	struct zephyr_domain_thread *dt;
 	int core;
 
 	domain = domain_init(SOF_SCHEDULE_LL_TIMER, clk, false,
@@ -584,14 +597,9 @@ struct ll_schedule_domain *zephyr_domain_init(int clk)
 	ll_sch_domain_set_pdata(domain, zephyr_domain);
 
 	for (core = 0; core < CONFIG_CORE_COUNT; core++) {
-		dt = zephyr_domain->domain_thread + core;
-#ifdef CONFIG_SOF_USERSPACE_LL
-		dt->sem = k_object_alloc(K_OBJ_SEM);
-		if (!dt->sem) {
-			tr_err(&ll_tr, "Failed to allocate semaphore for core %d", core);
-			k_panic();
-		}
-#else
+#ifndef CONFIG_SOF_USERSPACE_LL
+		struct zephyr_domain_thread *dt = zephyr_domain->domain_thread + core;
+
 		/* not allocated dynamically when LL in kernel space */
 		dt->sem = &dt->sem_obj;
 #endif