drm/nouveau/gsp: remove gsp-specific chid allocation path

In order to specify a channel ID to RM during channel allocation, the
channel ID is broken down into a "userd page" index and an index into
that page.

It was assumed that RM would enforce that the same physical block of
memory be used for all CHIDs within a "userd page", and the GSP paths
override NVKM's normal CHID allocation to handle this.

However, none of that turns out to be necessary.

Remove the GSP-specific code and use the regular CHID allocation path.

Signed-off-by: Ben Skeggs <bskeggs@nvidia.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/nouveau/nvkm/engine/fifo/base.c

@@ -349,8 +349,6 @@ nvkm_fifo_dtor(struct nvkm_engine *engine)
 	nvkm_chid_unref(&fifo->cgid);
 	nvkm_chid_unref(&fifo->chid);
 
-	mutex_destroy(&fifo->userd.mutex);
-
 	nvkm_event_fini(&fifo->nonstall.event);
 	mutex_destroy(&fifo->mutex);
 
@@ -391,8 +389,5 @@ nvkm_fifo_new_(const struct nvkm_fifo_func *func, struct nvkm_device *device,
 	spin_lock_init(&fifo->lock);
 	mutex_init(&fifo->mutex);
 
-	INIT_LIST_HEAD(&fifo->userd.list);
-	mutex_init(&fifo->userd.mutex);
-
 	return nvkm_engine_ctor(&nvkm_fifo, device, type, inst, true, &fifo->engine);
 }