drm/amdgpu: Let KFD use more VMIDs on Arcturus

When there is no graphics support, KFD can use more of the VMIDs. Graphics
VMIDs are only used for video decoding/encoding and post processing. With
two VCE engines, there is no reason to reserve more than 2 VMIDs for that.
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

@@ -1245,10 +1245,15 @@ static int gmc_v9_0_sw_init(void *handle)
 	/*
 	 * number of VMs
 	 * VMID 0 is reserved for System
-	 * amdgpu graphics/compute will use VMIDs 1-7
-	 * amdkfd will use VMIDs 8-15
+	 * amdgpu graphics/compute will use VMIDs 1..n-1
+	 * amdkfd will use VMIDs n..15
+	 *
+	 * The first KFD VMID is 8 for GPUs with graphics, 3 for
+	 * compute-only GPUs. On compute-only GPUs that leaves 2 VMIDs
+	 * for video processing.
 	 */
-	adev->vm_manager.first_kfd_vmid = 8;
+	adev->vm_manager.first_kfd_vmid =
+		adev->asic_type == CHIP_ARCTURUS ? 3 : 8;
 
 	amdgpu_vm_manager_init(adev);