drm/nouveau/fifo: add an api for initiating channel recovery

This will be used by callers outside of fifo interrupt handlers.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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

@@ -31,6 +31,17 @@
 #include <nvif/event.h>
 #include <nvif/unpack.h>
 
+void
+nvkm_fifo_recover_chan(struct nvkm_fifo *fifo, int chid)
+{
+	unsigned long flags;
+	if (WARN_ON(!fifo->func->recover_chan))
+		return;
+	spin_lock_irqsave(&fifo->lock, flags);
+	fifo->func->recover_chan(fifo, chid);
+	spin_unlock_irqrestore(&fifo->lock, flags);
+}
+
 void
 nvkm_fifo_pause(struct nvkm_fifo *fifo, unsigned long *flags)
 {

drivers/gpu/drm/nouveau/nvkm/engine/fifo/priv.h

@@ -8,6 +8,7 @@ int nvkm_fifo_ctor(const struct nvkm_fifo_func *, struct nvkm_device *,
 void nvkm_fifo_uevent(struct nvkm_fifo *);
 void nvkm_fifo_cevent(struct nvkm_fifo *);
 void nvkm_fifo_kevent(struct nvkm_fifo *, int chid);
+void nvkm_fifo_recover_chan(struct nvkm_fifo *, int chid);
 
 struct nvkm_fifo_chan_oclass;
 struct nvkm_fifo_func {
@@ -20,6 +21,7 @@ struct nvkm_fifo_func {
 	void (*start)(struct nvkm_fifo *, unsigned long *);
 	void (*uevent_init)(struct nvkm_fifo *);
 	void (*uevent_fini)(struct nvkm_fifo *);
+	void (*recover_chan)(struct nvkm_fifo *, int chid);
 	int (*class_get)(struct nvkm_fifo *, int index,
 			 const struct nvkm_fifo_chan_oclass **);
 	const struct nvkm_fifo_chan_oclass *chan[];