drm/nouveau/gr/tu102-: prepare for GSP-RM

- (temporarily) disable if GSP-RM detected, will be added later
- make init() optional

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230918202149.4343-27-skeggsb@gmail.com

Author: Ben Skeggs

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

@@ -160,7 +160,11 @@ static int
 nvkm_gr_init(struct nvkm_engine *engine)
 {
 	struct nvkm_gr *gr = nvkm_gr(engine);
-	return gr->func->init(gr);
+
+	if (gr->func->init)
+		return gr->func->init(gr);
+
+	return 0;
 }
 
 static int

drivers/gpu/drm/nouveau/nvkm/engine/gr/ga102.c

@@ -23,6 +23,7 @@
 #include "ctxgf100.h"
 
 #include <core/firmware.h>
+#include <subdev/gsp.h>
 #include <subdev/acr.h>
 #include <subdev/timer.h>
 #include <subdev/vfn.h>
@@ -350,5 +351,8 @@ ga102_gr_fwif[] = {
 int
 ga102_gr_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst, struct nvkm_gr **pgr)
 {
+	if (nvkm_gsp_rm(device->gsp))
+		return -ENODEV;
+
 	return gf100_gr_new_(ga102_gr_fwif, device, type, inst, pgr);
 }

drivers/gpu/drm/nouveau/nvkm/engine/gr/tu102.c

@@ -22,6 +22,8 @@
 #include "gf100.h"
 #include "ctxgf100.h"
 
+#include <subdev/gsp.h>
+
 #include <nvif/class.h>
 
 void
@@ -216,5 +218,8 @@ tu102_gr_fwif[] = {
 int
 tu102_gr_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst, struct nvkm_gr **pgr)
 {
+	if (nvkm_gsp_rm(device->gsp))
+		return -ENODEV;
+
 	return gf100_gr_new_(tu102_gr_fwif, device, type, inst, pgr);
 }