drm/amdgpu: make sure userqs are enabled in userq IOCTLs

These IOCTLs shouldn't be called when userqs are not
enabled. Make sure they are enabled before executing
the IOCTLs.

Reviewed-by: Christian König <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>
(cherry picked from commit d967509651601cddce7ff2a9f09479f3636f684d)
Cc: [e-mail]

drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c

···
 	return 0;
 }
 
+bool amdgpu_userq_enabled(struct drm_device *dev)
+{
+	struct amdgpu_device *adev = drm_to_adev(dev);
+	int i;
+
+	for (i = 0; i < AMDGPU_HW_IP_NUM; i++) {
+		if (adev->userq_funcs[i])
+			return true;
+	}
+
+	return false;
+}
+
 int amdgpu_userq_ioctl(struct drm_device *dev, void *data,
 		       struct drm_file *filp)
 {
 	union drm_amdgpu_userq *args = data;
 	int r;
+
+	if (!amdgpu_userq_enabled(dev))
+		return -ENOTSUPP;
 
 	if (amdgpu_userq_input_args_validate(dev, args, filp) < 0)
 		return -EINVAL;

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

···
 					     struct drm_file *filp);
 
 u32 amdgpu_userq_get_supported_ip_mask(struct amdgpu_device *adev);
+bool amdgpu_userq_enabled(struct drm_device *dev);
 
 int amdgpu_userq_suspend(struct amdgpu_device *adev);
 int amdgpu_userq_resume(struct amdgpu_device *adev);

drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c

···
 	struct drm_exec exec;
 	u64 wptr;
 
+	if (!amdgpu_userq_enabled(dev))
+		return -ENOTSUPP;
+
 	num_syncobj_handles = args->num_syncobj_handles;
 	syncobj_handles = memdup_user(u64_to_user_ptr(args->syncobj_handles),
 				      size_mul(sizeof(u32), num_syncobj_handles));
···
 	u16 num_points, num_fences = 0;
 	int r, i, rentry, wentry, cnt;
 	struct drm_exec exec;
+
+	if (!amdgpu_userq_enabled(dev))
+		return -ENOTSUPP;
 
 	num_read_bo_handles = wait_info->num_bo_read_handles;
 	bo_handles_read = memdup_user(u64_to_user_ptr(wait_info->bo_read_handles),