drm/amdgpu: reserve mmhub engine 3 for UMSCH FW

UMSCH FW uses mmhub engine 3 for invalidation.
Signed-off-by: Lang Yu <Lang.Yu@amd.com>
Acked-by: Leo Liu <leo.liu@amd.com>
Acked-by: Veerabadhran Gopalakrishnan <Veerabadhran.Gopalakrishnan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -549,13 +549,17 @@ int amdgpu_gmc_allocate_vm_inv_eng(struct amdgpu_device *adev)
 		/* reserve engine 5 for firmware */
 		if (adev->enable_mes)
 			vm_inv_engs[i] &= ~(1 << 5);
+		/* reserve mmhub engine 3 for firmware */
+		if (adev->enable_umsch_mm)
+			vm_inv_engs[i] &= ~(1 << 3);
 	}
 
 	for (i = 0; i < adev->num_rings; ++i) {
 		ring = adev->rings[i];
 		vmhub = ring->vm_hub;
 
-		if (ring == &adev->mes.ring)
+		if (ring == &adev->mes.ring ||
+		    ring == &adev->umsch_mm.ring)
 			continue;
 
 		inv_eng = ffs(vm_inv_engs[vmhub]);