drm/nouveau/fifo/gk104-: virtualise pbdma enable function

Turing will require different code.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c

@@ -249,8 +249,16 @@ gk104_fifo_runlist = {
 	.commit = gk104_fifo_runlist_commit,
 };
 
+void
+gk104_fifo_pbdma_init(struct gk104_fifo *fifo)
+{
+	struct nvkm_device *device = fifo->base.engine.subdev.device;
+	nvkm_wr32(device, 0x000204, (1 << fifo->pbdma_nr) - 1);
+}
+
 const struct gk104_fifo_pbdma_func
 gk104_fifo_pbdma = {
+	.init = gk104_fifo_pbdma_init,
 };
 
 static void
@@ -991,7 +999,7 @@ gk104_fifo_init(struct nvkm_fifo *base)
 	int i;
 
 	/* Enable PBDMAs. */
-	nvkm_wr32(device, 0x000204, (1 << fifo->pbdma_nr) - 1);
+	fifo->func->pbdma->init(fifo);
 
 	/* PBDMA[n] */
 	for (i = 0; i < fifo->pbdma_nr; i++) {

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.h

@@ -46,6 +46,7 @@ struct gk104_fifo {
 
 struct gk104_fifo_func {
 	const struct gk104_fifo_pbdma_func {
+		void (*init)(struct gk104_fifo *);
 		void (*init_timeout)(struct gk104_fifo *);
 	} *pbdma;
 
@@ -88,6 +89,7 @@ void gk104_fifo_runlist_remove(struct gk104_fifo *, struct gk104_fifo_chan *);
 void gk104_fifo_runlist_update(struct gk104_fifo *, int runl);
 
 extern const struct gk104_fifo_pbdma_func gk104_fifo_pbdma;
+void gk104_fifo_pbdma_init(struct gk104_fifo *);
 extern const struct nvkm_enum gk104_fifo_fault_access[];
 extern const struct nvkm_enum gk104_fifo_fault_engine[];
 extern const struct nvkm_enum gk104_fifo_fault_reason[];

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk208.c

@@ -38,6 +38,7 @@ gk208_fifo_pbdma_init_timeout(struct gk104_fifo *fifo)
 
 const struct gk104_fifo_pbdma_func
 gk208_fifo_pbdma = {
+	.init = gk104_fifo_pbdma_init,
 	.init_timeout = gk208_fifo_pbdma_init_timeout,
 };