diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
index 1e3a23c81552..9af7c97af5be 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
@@ -952,9 +952,11 @@ int amdgpu_mes_rs64mem_init(struct amdgpu_mes *mes)
 	return 0;
 }
 
-/**
- * amdgpu_mes_rs64mem_fini - tear down RS64 local memory management
- */
+ /**
+  * amdgpu_mes_rs64mem_fini - tear down RS64 local memory management
+  *
+  * @mes: MES instance
+  */
 void amdgpu_mes_rs64mem_fini(struct amdgpu_mes *mes)
 {
 	if (mes->ctx_array_size_bo) {
@@ -1038,9 +1040,10 @@ int amdgpu_mes_rs64mem_setup_bitmaps(struct amdgpu_mes *mes)
  * amdgpu_mes_alloc_proc_ctx_index - allocate a process context slot
  *
  * @mes: MES instance
+ * @queue: Usermode queue receiving the allocated process context index
  *
- * Returns 0 on success, -ENOSPC if all slots are used (caller should
- * fall back to system memory path).
+ * Returns 0 on success, -ENOSPC if all slots are used, or
+ * -EOPNOTSUPP if RS64 local memory is unavailable.
  */
 int amdgpu_mes_alloc_proc_ctx_index(struct amdgpu_mes *mes,
 				    struct amdgpu_usermode_queue *queue)
@@ -1064,9 +1067,12 @@ int amdgpu_mes_alloc_proc_ctx_index(struct amdgpu_mes *mes,
 	return 0;
 }
 
-/**
- * amdgpu_mes_free_proc_ctx_index - free a process context slot
- */
+ /**
+  * amdgpu_mes_free_proc_ctx_index - free a process context slot
+  *
+  * @mes: MES instance
+  * @queue: Usermode queue whose process context index is released
+  */
 void amdgpu_mes_free_proc_ctx_index(struct amdgpu_mes *mes,
 				    struct amdgpu_usermode_queue *queue)
 {
@@ -1080,9 +1086,15 @@ void amdgpu_mes_free_proc_ctx_index(struct amdgpu_mes *mes,
 	amdgpu_mes_unlock(mes);
 }
 
-/**
- * amdgpu_mes_alloc_gang_ctx_index - allocate a gang context slot
- */
+ /**
+  * amdgpu_mes_alloc_gang_ctx_index - allocate a gang context slot
+  *
+  * @mes: MES instance
+  * @queue: Usermode queue receiving the allocated gang context index
+  *
+  * Returns 0 on success, -ENOSPC if all slots are used, or
+  * -EOPNOTSUPP if RS64 local memory is unavailable.
+  */
 int amdgpu_mes_alloc_gang_ctx_index(struct amdgpu_mes *mes,
 				    struct amdgpu_usermode_queue *queue)
 {
@@ -1105,9 +1117,12 @@ int amdgpu_mes_alloc_gang_ctx_index(struct amdgpu_mes *mes,
 	return 0;
 }
 
-/**
- * amdgpu_mes_free_gang_ctx_index - free a gang context slot
- */
+ /**
+  * amdgpu_mes_free_gang_ctx_index - free a gang context slot
+  *
+  * @mes: MES instance
+  * @queue: Usermode queue whose gang context index is released
+  */
 void amdgpu_mes_free_gang_ctx_index(struct amdgpu_mes *mes,
 				    struct amdgpu_usermode_queue *queue)
 {