drm/nouveau/top: parse device topology right after devinit

We're going to want this information available earlier than it is now.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/subdev/top.h

@@ -21,6 +21,7 @@ struct nvkm_top_device {
 	struct list_head head;
 };
 
+int nvkm_top_parse(struct nvkm_device *);
 u32 nvkm_top_addr(struct nvkm_device *, enum nvkm_subdev_type, int);
 u32 nvkm_top_reset(struct nvkm_device *, enum nvkm_subdev_type, int);
 u32 nvkm_top_intr_mask(struct nvkm_device *, enum nvkm_subdev_type, int);

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

@@ -2775,6 +2775,10 @@ nvkm_device_preinit(struct nvkm_device *device)
 	if (ret)
 		goto fail;
 
+	ret = nvkm_top_parse(device);
+	if (ret)
+		goto fail;
+
 	time = ktime_to_us(ktime_get()) - time;
 	nvdev_trace(device, "preinit completed in %lldus\n", time);
 	return 0;

drivers/gpu/drm/nouveau/nvkm/subdev/top/base.c

@@ -117,11 +117,15 @@ nvkm_top_fault(struct nvkm_device *device, int fault)
 	return NULL;
 }
 
-static int
-nvkm_top_oneinit(struct nvkm_subdev *subdev)
+int
+nvkm_top_parse(struct nvkm_device *device)
 {
-	struct nvkm_top *top = nvkm_top(subdev);
-	return top->func->oneinit(top);
+	struct nvkm_top *top = device->top;
+
+	if (!top || !list_empty(&top->device))
+		return 0;
+
+	return top->func->parse(top);
 }
 
 static void *
@@ -141,7 +145,6 @@ nvkm_top_dtor(struct nvkm_subdev *subdev)
 static const struct nvkm_subdev_func
 nvkm_top = {
 	.dtor = nvkm_top_dtor,
-	.oneinit = nvkm_top_oneinit,
 };
 
 int

drivers/gpu/drm/nouveau/nvkm/subdev/top/ga100.c

@@ -22,7 +22,7 @@
 #include "priv.h"
 
 static int
-ga100_top_oneinit(struct nvkm_top *top)
+ga100_top_parse(struct nvkm_top *top)
 {
 	struct nvkm_subdev *subdev = &top->subdev;
 	struct nvkm_device *device = subdev->device;
@@ -97,7 +97,7 @@ ga100_top_oneinit(struct nvkm_top *top)
 
 static const struct nvkm_top_func
 ga100_top = {
-	.oneinit = ga100_top_oneinit,
+	.parse = ga100_top_parse,
 };
 
 int

drivers/gpu/drm/nouveau/nvkm/subdev/top/gk104.c

@@ -24,7 +24,7 @@
 #include "priv.h"
 
 static int
-gk104_top_oneinit(struct nvkm_top *top)
+gk104_top_parse(struct nvkm_top *top)
 {
 	struct nvkm_subdev *subdev = &top->subdev;
 	struct nvkm_device *device = subdev->device;
@@ -108,7 +108,7 @@ gk104_top_oneinit(struct nvkm_top *top)
 
 static const struct nvkm_top_func
 gk104_top = {
-	.oneinit = gk104_top_oneinit,
+	.parse = gk104_top_parse,
 };
 
 int

drivers/gpu/drm/nouveau/nvkm/subdev/top/priv.h

@@ -5,7 +5,7 @@
 #include <subdev/top.h>
 
 struct nvkm_top_func {
-	int (*oneinit)(struct nvkm_top *);
+	int (*parse)(struct nvkm_top *);
 };
 
 int nvkm_top_new_(const struct nvkm_top_func *, struct nvkm_device *, enum nvkm_subdev_type, int,