drm/nouveau/tmr: type-safe PTIMER-based delay/wait macros

These require an explicit struct nvkm_device pointer, unlike the previous
macros which take a void *, and work for (almost) anything derived from
nvkm_object by using some heuristics.

These macros are more general than the previous ones, and can be used to
handle PTIMER-based busy-waits (will be used in later devinit fixes) as
well as more complicated wait conditions.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvif/device.c

@@ -24,6 +24,12 @@
 
 #include <nvif/device.h>
 
+u64
+nvif_device_time(struct nvif_device *device)
+{
+	return nvxx_timer(device)->read(nvxx_timer(device));
+}
+
 void
 nvif_device_fini(struct nvif_device *device)
 {