drm/amdgpu/mes: add amdgpu_mes driver parameter

amdgpu_mes, which is a driver scope parameter, is used
to whether enable mes or not.

MES (Micro Engine Scheduler) is the new on chip hw scheduling
microcontroller.  It can be used to handle queue scheduling and
preemption and priorities.
Acked-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Jack Xiao <Jack.Xiao@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -162,6 +162,7 @@ extern uint amdgpu_ras_mask;
 extern int amdgpu_async_gfx_ring;
 extern int amdgpu_mcbp;
 extern int amdgpu_discovery;
+extern int amdgpu_mes;
 
 #ifdef CONFIG_DRM_AMDGPU_SI
 extern int amdgpu_si_support;

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -139,6 +139,7 @@ uint amdgpu_dc_feature_mask = 0;
 int amdgpu_async_gfx_ring = 1;
 int amdgpu_mcbp = 0;
 int amdgpu_discovery = 0;
+int amdgpu_mes = 0;
 
 struct amdgpu_mgpu_info mgpu_info = {
 	.mutex = __MUTEX_INITIALIZER(mgpu_info.mutex),
@@ -584,6 +585,10 @@ MODULE_PARM_DESC(discovery,
 	"Allow driver to discover hardware IPs from IP Discovery table at the top of VRAM");
 module_param_named(discovery, amdgpu_discovery, int, 0444);
 
+MODULE_PARM_DESC(mes,
+	"Enable Micro Engine Scheduler (0 = disabled (default), 1 = enabled)");
+module_param_named(mes, amdgpu_mes, int, 0444);
+
 #ifdef CONFIG_HSA_AMD
 /**
  * DOC: sched_policy (int)