gpu: nvgpu: add domain name API

Add nvgpu_nvs_domain_get_name() to minimize messing up with nvs
internals and to help code organization when nvs is not built in yet. A
stub to help compilation returns NULL because no domains can exist when
the stub is built in, and thus it won't be used.

Jira NVGPU-6788

Change-Id: If663f7c0e8434ef00dd3a3f40f6404a35b477f2b
Signed-off-by: Konsta Hölttä <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2673120
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit

drivers/gpu/nvgpu/common/fifo/tsg.c

@@ -167,23 +167,23 @@ int nvgpu_tsg_bind_channel(struct nvgpu_tsg *tsg, struct nvgpu_channel *ch)
 int nvgpu_tsg_bind_domain(struct nvgpu_tsg *tsg, struct nvgpu_nvs_domain *nnvs_domain)
 {
 	struct nvgpu_runlist_domain *rl_domain;
-	struct nvs_domain *nvs_domain;
 	struct gk20a *g = tsg->g;
+	const char *name;
 
 	/* Hopping channels from one domain to another is not allowed */
 	if (tsg->num_active_channels != 0U) {
 		return -EINVAL;
 	}
 
-	nvs_domain = nnvs_domain->parent;
+	name = nvgpu_nvs_domain_get_name(nnvs_domain);
 
 	/*
 	 * The domain ptr will get updated with the right id once the runlist
 	 * gets specified based on the first channel.
 	 */
-	rl_domain = nvgpu_rl_domain_get(g, 0, nvs_domain->name);
+	rl_domain = nvgpu_rl_domain_get(g, 0, name);
 	if (rl_domain == NULL) {
-		nvgpu_err(g, "rl domain not found (%s)", nvs_domain->name);
+		nvgpu_err(g, "rl domain not found (%s)", name);
 		/*
 		 * This shouldn't happen because the nvs domain guarantees RL domains.
 		 *

drivers/gpu/nvgpu/common/nvs/nvs_sched.c

@@ -490,6 +490,13 @@ u32 nvgpu_nvs_domain_count(struct gk20a *g)
 	return count;
 }
 
+const char *nvgpu_nvs_domain_get_name(struct nvgpu_nvs_domain *dom)
+{
+	struct nvs_domain *nvs_dom = dom->parent;
+
+	return nvs_dom->name;
+}
+
 void nvgpu_nvs_get_log(struct gk20a *g, s64 *timestamp, const char **msg)
 {
 	struct nvs_log_event ev;

drivers/gpu/nvgpu/include/nvgpu/nvs.h

@@ -103,6 +103,7 @@ struct nvgpu_nvs_domain *
 nvgpu_nvs_domain_by_name(struct gk20a *g, const char *name);
 void nvgpu_nvs_domain_get(struct gk20a *g, struct nvgpu_nvs_domain *dom);
 void nvgpu_nvs_domain_put(struct gk20a *g, struct nvgpu_nvs_domain *dom);
+const char *nvgpu_nvs_domain_get_name(struct nvgpu_nvs_domain *dom);
 /*
  * Debug wrapper for NVS code.
  */
@@ -134,6 +135,12 @@ static inline void nvgpu_nvs_domain_put(struct gk20a *g, struct nvgpu_nvs_domain
 	(void)g;
 	(void)dom;
 }
+
+static inline const char *nvgpu_nvs_domain_get_name(struct nvgpu_nvs_domain *dom)
+{
+	(void)dom;
+	return NULL;
+}
 #endif
 
 #endif