schedule: ll: userspace: grant the LL thread rights on DP

The LL userspace thread has to interact with the DP one. Grant
required rights.

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

Author: lyakh

src/include/sof/schedule/ll_schedule_domain.h

@@ -330,6 +330,7 @@ struct ll_schedule_domain *zephyr_domain_init(int clk);
 struct k_thread *zephyr_domain_thread_tid(struct ll_schedule_domain *domain);
 struct k_thread *zephyr_domain_thread_tid_for_core(int core);
 struct k_mem_domain *zephyr_ll_mem_domain(void);
+struct k_thread *zephyr_ll_domain_thread(void);
 #endif /* CONFIG_SOF_USERSPACE_LL */
 #ifdef CONFIG_SOF_FULL_ZEPHYR_APPLICATION
 __syscall int zephyr_ll_task_sem_alloc(struct task *task);

src/schedule/zephyr_domain.c

@@ -525,6 +525,18 @@ struct k_thread *zephyr_domain_thread_tid_for_core(int core)
 	return ll_thread_tid[core];
 }
 
+struct k_thread *zephyr_ll_domain_thread(void)
+{
+	struct ll_schedule_domain *ll_domain = zephyr_ll_domain();
+
+	if (!ll_domain)
+		return NULL;
+
+	struct zephyr_domain *zephyr_domain = ll_sch_domain_get_pdata(ll_domain);
+
+	return zephyr_domain->domain_thread[cpu_get_id()].ll_thread;
+}
+
 #endif /* CONFIG_SOF_USERSPACE_LL */
 
 #if CONFIG_CROSS_CORE_STREAM

src/schedule/zephyr_dp_schedule.c

@@ -62,7 +62,8 @@ void scheduler_dp_unlock(unsigned int key)
 
 void scheduler_dp_grant(k_tid_t thread_id, uint16_t core)
 {
-	k_thread_access_grant(thread_id, &dp_lock[core]);
+	if (thread_id)
+		k_thread_access_grant(thread_id, &dp_lock[core]);
 }
 
 /* dummy LL task - to start LL on secondary cores */

src/schedule/zephyr_dp_schedule_application.c

@@ -528,6 +528,9 @@ int scheduler_dp_task_init(struct task **task, const struct sof_uuid_entry *uid,
 
 	k_thread_access_grant(pdata->thread_id, pdata->event, &dp_sync[core]);
 	scheduler_dp_grant(pdata->thread_id, core);
+#if CONFIG_SOF_USERSPACE_LL
+	scheduler_dp_grant(zephyr_ll_domain_thread(), core);
+#endif
 
 	struct k_mem_domain *mdom = objpool_alloc(&dp_mdom_head, sizeof(*mdom),
 						  SOF_MEM_FLAG_COHERENT);