220 static void vhost_scsi_init_inflight(struct vhost_scsi *vs,  in vhost_scsi_init_inflight()  argument
228 		vq = &vs->vqs[i].vq;  in vhost_scsi_init_inflight()
233 		idx = vs->vqs[i].inflight_idx;  in vhost_scsi_init_inflight()
235 			old_inflight[i] = &vs->vqs[i].inflights[idx];  in vhost_scsi_init_inflight()
238 		vs->vqs[i].inflight_idx = idx ^ 1;  in vhost_scsi_init_inflight()
239 		new_inflight = &vs->vqs[i].inflights[idx ^ 1];  in vhost_scsi_init_inflight()
358 	struct vhost_scsi *vs = cmd->tvc_vhost;  in vhost_scsi_complete_cmd()  local
360 	llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);  in vhost_scsi_complete_cmd()
362 	vhost_work_queue(&vs->dev, &vs->vs_completion_work);  in vhost_scsi_complete_cmd()
391 static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)  in vhost_scsi_free_evt()  argument
393 	vs->vs_events_nr--;  in vhost_scsi_free_evt()
398 vhost_scsi_allocate_evt(struct vhost_scsi *vs,  in vhost_scsi_allocate_evt()  argument
401 	struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;  in vhost_scsi_allocate_evt()
404 	if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {  in vhost_scsi_allocate_evt()
405 		vs->vs_events_missed = true;  in vhost_scsi_allocate_evt()
412 		vs->vs_events_missed = true;  in vhost_scsi_allocate_evt()
418 	vs->vs_events_nr++;  in vhost_scsi_allocate_evt()
438 vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)  in vhost_scsi_do_evt_work()  argument
440 	struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;  in vhost_scsi_do_evt_work()
447 		vs->vs_events_missed = true;  in vhost_scsi_do_evt_work()
452 	vhost_disable_notify(&vs->dev, vq);  in vhost_scsi_do_evt_work()
457 		vs->vs_events_missed = true;  in vhost_scsi_do_evt_work()
461 		if (vhost_enable_notify(&vs->dev, vq))  in vhost_scsi_do_evt_work()
463 		vs->vs_events_missed = true;  in vhost_scsi_do_evt_work()
470 		vs->vs_events_missed = true;  in vhost_scsi_do_evt_work()
474 	if (vs->vs_events_missed) {  in vhost_scsi_do_evt_work()
476 		vs->vs_events_missed = false;  in vhost_scsi_do_evt_work()
482 		vhost_add_used_and_signal(&vs->dev, vq, head, 0);  in vhost_scsi_do_evt_work()
489 	struct vhost_scsi *vs = container_of(work, struct vhost_scsi,  in vhost_scsi_evt_work()  local
491 	struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;  in vhost_scsi_evt_work()
496 	llnode = llist_del_all(&vs->vs_event_list);  in vhost_scsi_evt_work()
498 		vhost_scsi_do_evt_work(vs, evt);  in vhost_scsi_evt_work()
499 		vhost_scsi_free_evt(vs, evt);  in vhost_scsi_evt_work()
511 	struct vhost_scsi *vs = container_of(work, struct vhost_scsi,  in vhost_scsi_complete_cmd_work()  local
522 	llnode = llist_del_all(&vs->vs_completion_list);  in vhost_scsi_complete_cmd_work()
545 			vq = q - vs->vqs;  in vhost_scsi_complete_cmd_work()
556 		vhost_signal(&vs->dev, &vs->vqs[vq].vq);  in vhost_scsi_complete_cmd_work()
785 vhost_scsi_send_bad_target(struct vhost_scsi *vs,  in vhost_scsi_send_bad_target()  argument
798 		vhost_add_used_and_signal(&vs->dev, vq, head, 0);  in vhost_scsi_send_bad_target()
804 vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)  in vhost_scsi_handle_vq()  argument
831 	vhost_disable_notify(&vs->dev, vq);  in vhost_scsi_handle_vq()
844 			if (unlikely(vhost_enable_notify(&vs->dev, vq))) {  in vhost_scsi_handle_vq()
845 				vhost_disable_notify(&vs->dev, vq);  in vhost_scsi_handle_vq()
894 			vhost_scsi_send_bad_target(vs, vq, head, out);  in vhost_scsi_handle_vq()
900 			vhost_scsi_send_bad_target(vs, vq, head, out);  in vhost_scsi_handle_vq()
907 			vhost_scsi_send_bad_target(vs, vq, head, out);  in vhost_scsi_handle_vq()
953 					vhost_scsi_send_bad_target(vs, vq, head, out);  in vhost_scsi_handle_vq()
961 					vhost_scsi_send_bad_target(vs, vq, head, out);  in vhost_scsi_handle_vq()
999 			vhost_scsi_send_bad_target(vs, vq, head, out);  in vhost_scsi_handle_vq()
1008 			vhost_scsi_send_bad_target(vs, vq, head, out);  in vhost_scsi_handle_vq()
1011 		cmd->tvc_vhost = vs;  in vhost_scsi_handle_vq()
1028 				vhost_scsi_send_bad_target(vs, vq, head, out);  in vhost_scsi_handle_vq()
1057 vhost_scsi_send_evt(struct vhost_scsi *vs,  in vhost_scsi_send_evt()  argument
1065 	evt = vhost_scsi_allocate_evt(vs, event, reason);  in vhost_scsi_send_evt()
1082 	llist_add(&evt->list, &vs->vs_event_list);  in vhost_scsi_send_evt()
1083 	vhost_work_queue(&vs->dev, &vs->vs_event_work);  in vhost_scsi_send_evt()
1090 	struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);  in vhost_scsi_evt_handle_kick()  local
1096 	if (vs->vs_events_missed)  in vhost_scsi_evt_handle_kick()
1097 		vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);  in vhost_scsi_evt_handle_kick()
1106 	struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);  in vhost_scsi_handle_kick()  local
1108 	vhost_scsi_handle_vq(vs, vq);  in vhost_scsi_handle_kick()
1111 static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)  in vhost_scsi_flush_vq()  argument
1113 	vhost_poll_flush(&vs->vqs[index].vq.poll);  in vhost_scsi_flush_vq()
1117 static void vhost_scsi_flush(struct vhost_scsi *vs)  in vhost_scsi_flush()  argument
1123 	vhost_scsi_init_inflight(vs, old_inflight);  in vhost_scsi_flush()
1135 		vhost_scsi_flush_vq(vs, i);  in vhost_scsi_flush()
1136 	vhost_work_flush(&vs->dev, &vs->vs_completion_work);  in vhost_scsi_flush()
1137 	vhost_work_flush(&vs->dev, &vs->vs_event_work);  in vhost_scsi_flush()
1152 vhost_scsi_set_endpoint(struct vhost_scsi *vs,  in vhost_scsi_set_endpoint()  argument
1164 	mutex_lock(&vs->dev.mutex);  in vhost_scsi_set_endpoint()
1167 	for (index = 0; index < vs->dev.nvqs; ++index) {  in vhost_scsi_set_endpoint()
1169 		if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {  in vhost_scsi_set_endpoint()
1181 	if (vs->vs_tpg)  in vhost_scsi_set_endpoint()
1182 		memcpy(vs_tpg, vs->vs_tpg, len);  in vhost_scsi_set_endpoint()
1197 			if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {  in vhost_scsi_set_endpoint()
1218 			tpg->vhost_scsi = vs;  in vhost_scsi_set_endpoint()
1227 		memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,  in vhost_scsi_set_endpoint()
1228 		       sizeof(vs->vs_vhost_wwpn));  in vhost_scsi_set_endpoint()
1230 			vq = &vs->vqs[i].vq;  in vhost_scsi_set_endpoint()
1245 	vhost_scsi_flush(vs);  in vhost_scsi_set_endpoint()
1246 	kfree(vs->vs_tpg);  in vhost_scsi_set_endpoint()
1247 	vs->vs_tpg = vs_tpg;  in vhost_scsi_set_endpoint()
1250 	mutex_unlock(&vs->dev.mutex);  in vhost_scsi_set_endpoint()
1256 vhost_scsi_clear_endpoint(struct vhost_scsi *vs,  in vhost_scsi_clear_endpoint()  argument
1268 	mutex_lock(&vs->dev.mutex);  in vhost_scsi_clear_endpoint()
1270 	for (index = 0; index < vs->dev.nvqs; ++index) {  in vhost_scsi_clear_endpoint()
1271 		if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {  in vhost_scsi_clear_endpoint()
1277 	if (!vs->vs_tpg) {  in vhost_scsi_clear_endpoint()
1284 		tpg = vs->vs_tpg[target];  in vhost_scsi_clear_endpoint()
1305 		vs->vs_tpg[target] = NULL;  in vhost_scsi_clear_endpoint()
1317 			vq = &vs->vqs[i].vq;  in vhost_scsi_clear_endpoint()
1327 	vhost_scsi_flush(vs);  in vhost_scsi_clear_endpoint()
1328 	kfree(vs->vs_tpg);  in vhost_scsi_clear_endpoint()
1329 	vs->vs_tpg = NULL;  in vhost_scsi_clear_endpoint()
1330 	WARN_ON(vs->vs_events_nr);  in vhost_scsi_clear_endpoint()
1331 	mutex_unlock(&vs->dev.mutex);  in vhost_scsi_clear_endpoint()
1338 	mutex_unlock(&vs->dev.mutex);  in vhost_scsi_clear_endpoint()
1343 static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)  in vhost_scsi_set_features()  argument
1351 	mutex_lock(&vs->dev.mutex);  in vhost_scsi_set_features()
1353 	    !vhost_log_access_ok(&vs->dev)) {  in vhost_scsi_set_features()
1354 		mutex_unlock(&vs->dev.mutex);  in vhost_scsi_set_features()
1359 		vq = &vs->vqs[i].vq;  in vhost_scsi_set_features()
1364 	mutex_unlock(&vs->dev.mutex);  in vhost_scsi_set_features()
1370 	struct vhost_scsi *vs;  in vhost_scsi_open()  local
1374 	vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL);  in vhost_scsi_open()
1375 	if (!vs) {  in vhost_scsi_open()
1376 		vs = vzalloc(sizeof(*vs));  in vhost_scsi_open()
1377 		if (!vs)  in vhost_scsi_open()
1385 	vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);  in vhost_scsi_open()
1386 	vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);  in vhost_scsi_open()
1388 	vs->vs_events_nr = 0;  in vhost_scsi_open()
1389 	vs->vs_events_missed = false;  in vhost_scsi_open()
1391 	vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;  in vhost_scsi_open()
1392 	vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;  in vhost_scsi_open()
1393 	vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;  in vhost_scsi_open()
1394 	vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;  in vhost_scsi_open()
1396 		vqs[i] = &vs->vqs[i].vq;  in vhost_scsi_open()
1397 		vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;  in vhost_scsi_open()
1399 	vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);  in vhost_scsi_open()
1401 	vhost_scsi_init_inflight(vs, NULL);  in vhost_scsi_open()
1403 	f->private_data = vs;  in vhost_scsi_open()
1407 	kvfree(vs);  in vhost_scsi_open()
1414 	struct vhost_scsi *vs = f->private_data;  in vhost_scsi_release()  local
1417 	mutex_lock(&vs->dev.mutex);  in vhost_scsi_release()
1418 	memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));  in vhost_scsi_release()
1419 	mutex_unlock(&vs->dev.mutex);  in vhost_scsi_release()
1420 	vhost_scsi_clear_endpoint(vs, &t);  in vhost_scsi_release()
1421 	vhost_dev_stop(&vs->dev);  in vhost_scsi_release()
1422 	vhost_dev_cleanup(&vs->dev);  in vhost_scsi_release()
1424 	vhost_scsi_flush(vs);  in vhost_scsi_release()
1425 	kfree(vs->dev.vqs);  in vhost_scsi_release()
1426 	kvfree(vs);  in vhost_scsi_release()
1435 	struct vhost_scsi *vs = f->private_data;  in vhost_scsi_ioctl()  local
1443 	struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;  in vhost_scsi_ioctl()
1452 		return vhost_scsi_set_endpoint(vs, &backend);  in vhost_scsi_ioctl()
1459 		return vhost_scsi_clear_endpoint(vs, &backend);  in vhost_scsi_ioctl()
1468 		vs->vs_events_missed = events_missed;  in vhost_scsi_ioctl()
1473 		events_missed = vs->vs_events_missed;  in vhost_scsi_ioctl()
1486 		return vhost_scsi_set_features(vs, features);  in vhost_scsi_ioctl()
1488 		mutex_lock(&vs->dev.mutex);  in vhost_scsi_ioctl()
1489 		r = vhost_dev_ioctl(&vs->dev, ioctl, argp);  in vhost_scsi_ioctl()
1492 			r = vhost_vring_ioctl(&vs->dev, ioctl, argp);  in vhost_scsi_ioctl()
1493 		mutex_unlock(&vs->dev.mutex);  in vhost_scsi_ioctl()
1554 	struct vhost_scsi *vs = tpg->vhost_scsi;  in vhost_scsi_do_plug()  local
1558 	if (!vs)  in vhost_scsi_do_plug()
1561 	mutex_lock(&vs->dev.mutex);  in vhost_scsi_do_plug()
1568 	vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;  in vhost_scsi_do_plug()
1571 		vhost_scsi_send_evt(vs, tpg, lun,  in vhost_scsi_do_plug()
1574 	mutex_unlock(&vs->dev.mutex);  in vhost_scsi_do_plug()