xtensa: mpu: update hardware if manipulating current domain

If adding/removing to the domain of the current running
thread, we need to update the hardware MPU regions or else
the addition or removal would not be reflected to current
running thread.

Signed-off-by: Daniel Leung <[email protected]>

Author: dcpleung

arch/xtensa/core/mpu.c

@@ -773,6 +773,7 @@ int arch_mem_domain_partition_remove(struct k_mem_domain *domain,
 {
 	int ret;
 	uint32_t perm;
+	struct k_thread *cur_thread;
 	struct xtensa_mpu_map *map = &domain->arch.mpu_map;
 	struct k_mem_partition *partition = &domain->partitions[partition_id];
 	uintptr_t end_addr = partition->start + partition->size;
@@ -841,6 +842,15 @@ int arch_mem_domain_partition_remove(struct k_mem_domain *domain,
 				 CONFIG_XTENSA_MPU_DEFAULT_MEM_TYPE,
 				 NULL);
 
+	/*
+	 * Need to update hardware MPU regions if we are removing
+	 * partition from the domain of the current running thread.
+	 */
+	cur_thread = _current_cpu->current;
+	if (cur_thread->mem_domain_info.mem_domain == domain) {
+		xtensa_mpu_map_write(cur_thread);
+	}
+
 out:
 	return ret;
 }
@@ -849,6 +859,7 @@ int arch_mem_domain_partition_add(struct k_mem_domain *domain,
 				  uint32_t partition_id)
 {
 	int ret;
+	struct k_thread *cur_thread;
 	struct xtensa_mpu_map *map = &domain->arch.mpu_map;
 	struct k_mem_partition *partition = &domain->partitions[partition_id];
 	uintptr_t end_addr = partition->start + partition->size;
@@ -863,6 +874,20 @@ int arch_mem_domain_partition_add(struct k_mem_domain *domain,
 				 CONFIG_XTENSA_MPU_DEFAULT_MEM_TYPE,
 				 NULL);
 
+	/*
+	 * Need to update hardware MPU regions if we are removing
+	 * partition from the domain of the current running thread.
+	 *
+	 * Note that this function can be called with dummy thread
+	 * at boot so we need to avoid writing MPU regions to
+	 * hardware.
+	 */
+	cur_thread = _current_cpu->current;
+	if (((cur_thread->base.thread_state & _THREAD_DUMMY) != _THREAD_DUMMY) &&
+	    (cur_thread->mem_domain_info.mem_domain == domain)) {
+		xtensa_mpu_map_write(cur_thread);
+	}
+
 out:
 	return ret;
 }