drm/amdgpu: dispatch jobs in cs

BO validation is moved to scheduler except usrptr which must be validated
in user process
Signed-off-by: Chunming Zhou <david1.zhou@amd.com>
Acked-by: Christian K?nig <christian.koenig@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -1243,6 +1243,7 @@ struct amdgpu_cs_parser {
 	struct work_struct job_work;
 	int (*prepare_job)(struct amdgpu_cs_parser *sched_job);
 	int (*run_job)(struct amdgpu_cs_parser *sched_job);
+	int (*free_job)(struct amdgpu_cs_parser *sched_job);
 };
 
 static inline u32 amdgpu_get_ib_value(struct amdgpu_cs_parser *p, uint32_t ib_idx, int idx)