drm/amdgpu: use GFP_ATOMIC instead of NOWAIT in the critical path

Otherwise job submissions can fail with ENOMEM.

We probably need to re-design the per VMID tracking at some point.

Signed-off-by: Christian König <christian.koenig@amd.com>
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4258
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cherry-picked-for: https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/164

Author: ChristianKoenigAMD

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

@@ -289,7 +289,7 @@ static int amdgpu_vmid_grab_reserved(struct amdgpu_vm *vm,
 	* user of the VMID.
 	*/
 	r = amdgpu_sync_fence(&(*id)->active, &job->base.s_fence->finished,
-			      GFP_NOWAIT);
+			      GFP_ATOMIC);
 	if (r)
 		return r;
 
@@ -349,7 +349,7 @@ static int amdgpu_vmid_grab_used(struct amdgpu_vm *vm,
 		 */
 		r = amdgpu_sync_fence(&(*id)->active,
 				      &job->base.s_fence->finished,
-				      GFP_NOWAIT);
+				      GFP_ATOMIC);
 		if (r)
 			return r;
 
@@ -402,7 +402,7 @@ int amdgpu_vmid_grab(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
 			/* Remember this submission as user of the VMID */
 			r = amdgpu_sync_fence(&id->active,
 					      &job->base.s_fence->finished,
-					      GFP_NOWAIT);
+					      GFP_ATOMIC);
 			if (r)
 				goto error;