drm/amdgpu: replace use of system_unbound_wq with system_dfl_wq

This patch continues the effort to refactor workqueue APIs, which has begun
with the changes introducing new workqueues and a new alloc_workqueue flag:

   commit 128ea9f ("workqueue: Add system_percpu_wq and system_dfl_wq")
   commit 930c2ea ("workqueue: Add new WQ_PERCPU flag")

The point of the refactoring is to eventually alter the default behavior of
workqueues to become unbound by default so that their workload placement is
optimized by the scheduler.

Before that to happen after a careful review and conversion of each individual
case, workqueue users must be converted to the better named new workqueues with
no intended behaviour changes:

   system_wq -> system_percpu_wq
   system_unbound_wq -> system_dfl_wq

This way the old obsolete workqueues (system_wq, system_unbound_wq) can be
removed in the future.

Suggested-by: Tejun Heo <tj@kernel.org>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Marco Crivellari <marco.crivellari@suse.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: DispatchCode

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

@@ -179,7 +179,7 @@ aldebaran_mode2_perform_reset(struct amdgpu_reset_control *reset_ctl,
 	list_for_each_entry(tmp_adev, reset_device_list, reset_list) {
 		/* For XGMI run all resets in parallel to speed up the process */
 		if (tmp_adev->gmc.xgmi.num_physical_nodes > 1) {
-			if (!queue_work(system_unbound_wq,
+			if (!queue_work(system_dfl_wq,
 					&tmp_adev->reset_cntl->reset_work))
 				r = -EALREADY;
 		} else

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

@@ -5339,7 +5339,7 @@ int amdgpu_do_asic_reset(struct list_head *device_list_handle,
 		list_for_each_entry(tmp_adev, device_list_handle, reset_list) {
 			/* For XGMI run all resets in parallel to speed up the process */
 			if (tmp_adev->gmc.xgmi.num_physical_nodes > 1) {
-				if (!queue_work(system_unbound_wq,
+				if (!queue_work(system_dfl_wq,
 						&tmp_adev->xgmi_reset_work))
 					r = -EALREADY;
 			} else

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

@@ -116,7 +116,7 @@ static int amdgpu_reset_xgmi_reset_on_init_perform_reset(
 	/* Mode1 reset needs to be triggered on all devices together */
 	list_for_each_entry(tmp_adev, reset_device_list, reset_list) {
 		/* For XGMI run all resets in parallel to speed up the process */
-		if (!queue_work(system_unbound_wq, &tmp_adev->xgmi_reset_work))
+		if (!queue_work(system_dfl_wq, &tmp_adev->xgmi_reset_work))
 			r = -EALREADY;
 		if (r) {
 			dev_err(tmp_adev->dev,