drm/nouveau/pm: expose name of domains

This is going to be very useful for GF100+ because each GPC can
have its own domain of counters.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvif/class.h

@@ -262,6 +262,7 @@ struct nvif_perfmon_query_domain_v0 {
 	__u8  iter;
 	__u16 signal_nr;
 	__u8  pad05[2];
+	char  name[64];
 };
 
 struct nvif_perfmon_query_signal_v0 {

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

@@ -454,6 +454,7 @@ nvkm_perfmon_mthd_query_domain(struct nvkm_object *object, void *data, u32 size)
 
 		args->v0.id         = di;
 		args->v0.signal_nr  = nvkm_perfdom_count_perfsig(dom);
+		strncpy(args->v0.name, dom->name, sizeof(args->v0.name));
 
 		/* Currently only global counters (PCOUNTER) are implemented
 		 * but this will be different for local counters (MP). */