schedule: ll_schedule_domain: add domain_thread_init/free ops

Add new domain ops that are called from privileged context and
are used to set up resources like threads and initialize other
kernel objects.

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

Author: kv2019i

src/include/sof/schedule/ll_schedule_domain.h

@@ -43,6 +43,20 @@ struct ll_schedule_domain_ops {
 			       void (*handler)(void *arg), void *arg);
 	int (*domain_unregister)(struct ll_schedule_domain *domain,
 				 struct task *task, uint32_t num_tasks);
+#if CONFIG_SOF_USERSPACE_LL
+	/*
+	 * Initialize the scheduling thread and perform all privileged setup
+	 * (thread creation, timer init, access grants). Called once from
+	 * kernel context before any user-space domain_register() calls.
+	 */
+	int (*domain_thread_init)(struct ll_schedule_domain *domain,
+				  struct task *task);
+	/* Free resources acquired by domain_thread_init(). Called from
+	 * kernel context when the scheduling context is being torn down.
+	 */
+	void (*domain_thread_free)(struct ll_schedule_domain *domain,
+				   uint32_t num_tasks);
+#endif
 	void (*domain_enable)(struct ll_schedule_domain *domain, int core);
 	void (*domain_disable)(struct ll_schedule_domain *domain, int core);
 #if CONFIG_CROSS_CORE_STREAM
@@ -179,6 +193,31 @@ static inline void domain_task_cancel(struct ll_schedule_domain *domain,
 		domain->ops->domain_task_cancel(domain, task);
 }
 
+#if CONFIG_SOF_USERSPACE_LL
+/*
+ * Initialize the scheduling thread and do all privileged setup.
+ * Must be called from kernel context before user-space tasks register.
+ */
+static inline int domain_thread_init(struct ll_schedule_domain *domain,
+				     struct task *task)
+{
+	assert(domain->ops->domain_thread_init);
+
+	return domain->ops->domain_thread_init(domain, task);
+}
+
+/*
+ * Free resources acquired by domain_thread_init().
+ * Must be called from kernel context.
+ */
+static inline void domain_thread_free(struct ll_schedule_domain *domain,
+				      uint32_t num_tasks)
+{
+	if (domain->ops->domain_thread_free)
+		domain->ops->domain_thread_free(domain, num_tasks);
+}
+#endif
+
 static inline int domain_register(struct ll_schedule_domain *domain,
 				  struct task *task,
 				  void (*handler)(void *arg), void *arg)