1 /*******************************************************************************
2 * Vhost kernel TCM fabric driver for virtio SCSI initiators
4 * (C) Copyright 2010-2012 RisingTide Systems LLC.
5 * (C) Copyright 2010-2012 IBM Corp.
7 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
9 * Authors: Nicholas A. Bellinger <nab@risingtidesystems.com>
10 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 ****************************************************************************/
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <generated/utsrelease.h>
27 #include <linux/utsname.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <linux/kthread.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/configfs.h>
34 #include <linux/ctype.h>
35 #include <linux/compat.h>
36 #include <linux/eventfd.h>
38 #include <linux/miscdevice.h>
39 #include <asm/unaligned.h>
40 #include <scsi/scsi.h>
41 #include <scsi/scsi_tcq.h>
42 #include <target/target_core_base.h>
43 #include <target/target_core_fabric.h>
44 #include <target/target_core_fabric_configfs.h>
45 #include <target/target_core_configfs.h>
46 #include <target/configfs_macros.h>
47 #include <linux/vhost.h>
48 #include <linux/virtio_scsi.h>
49 #include <linux/llist.h>
50 #include <linux/bitmap.h>
55 #define TCM_VHOST_VERSION "v0.1"
56 #define TCM_VHOST_NAMELEN 256
57 #define TCM_VHOST_MAX_CDB_SIZE 32
59 struct vhost_scsi_inflight
{
60 /* Wait for the flush operation to finish */
61 struct completion comp
;
62 /* Refcount for the inflight reqs */
66 struct tcm_vhost_cmd
{
67 /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
69 /* virtio-scsi initiator task attribute */
71 /* virtio-scsi initiator data direction */
72 enum dma_data_direction tvc_data_direction
;
73 /* Expected data transfer length from virtio-scsi header */
75 /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
77 /* The number of scatterlists associated with this cmd */
79 /* Saved unpacked SCSI LUN for tcm_vhost_submission_work() */
81 /* Pointer to the SGL formatted memory from virtio-scsi */
82 struct scatterlist
*tvc_sgl
;
83 /* Pointer to response */
84 struct virtio_scsi_cmd_resp __user
*tvc_resp
;
85 /* Pointer to vhost_scsi for our device */
86 struct vhost_scsi
*tvc_vhost
;
87 /* Pointer to vhost_virtqueue for the cmd */
88 struct vhost_virtqueue
*tvc_vq
;
89 /* Pointer to vhost nexus memory */
90 struct tcm_vhost_nexus
*tvc_nexus
;
91 /* The TCM I/O descriptor that is accessed via container_of() */
92 struct se_cmd tvc_se_cmd
;
93 /* work item used for cmwq dispatch to tcm_vhost_submission_work() */
94 struct work_struct work
;
95 /* Copy of the incoming SCSI command descriptor block (CDB) */
96 unsigned char tvc_cdb
[TCM_VHOST_MAX_CDB_SIZE
];
97 /* Sense buffer that will be mapped into outgoing status */
98 unsigned char tvc_sense_buf
[TRANSPORT_SENSE_BUFFER
];
99 /* Completed commands list, serviced from vhost worker thread */
100 struct llist_node tvc_completion_list
;
101 /* Used to track inflight cmd */
102 struct vhost_scsi_inflight
*inflight
;
105 struct tcm_vhost_nexus
{
106 /* Pointer to TCM session for I_T Nexus */
107 struct se_session
*tvn_se_sess
;
110 struct tcm_vhost_nacl
{
111 /* Binary World Wide unique Port Name for Vhost Initiator port */
113 /* ASCII formatted WWPN for Sas Initiator port */
114 char iport_name
[TCM_VHOST_NAMELEN
];
115 /* Returned by tcm_vhost_make_nodeacl() */
116 struct se_node_acl se_node_acl
;
120 struct tcm_vhost_tpg
{
121 /* Vhost port target portal group tag for TCM */
123 /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
124 int tv_tpg_port_count
;
125 /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
126 int tv_tpg_vhost_count
;
127 /* list for tcm_vhost_list */
128 struct list_head tv_tpg_list
;
129 /* Used to protect access for tpg_nexus */
130 struct mutex tv_tpg_mutex
;
131 /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
132 struct tcm_vhost_nexus
*tpg_nexus
;
133 /* Pointer back to tcm_vhost_tport */
134 struct tcm_vhost_tport
*tport
;
135 /* Returned by tcm_vhost_make_tpg() */
136 struct se_portal_group se_tpg
;
137 /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
138 struct vhost_scsi
*vhost_scsi
;
141 struct tcm_vhost_tport
{
142 /* SCSI protocol the tport is providing */
144 /* Binary World Wide unique Port Name for Vhost Target port */
146 /* ASCII formatted WWPN for Vhost Target port */
147 char tport_name
[TCM_VHOST_NAMELEN
];
148 /* Returned by tcm_vhost_make_tport() */
149 struct se_wwn tport_wwn
;
152 struct tcm_vhost_evt
{
153 /* event to be sent to guest */
154 struct virtio_scsi_event event
;
155 /* event list, serviced from vhost worker thread */
156 struct llist_node list
;
160 VHOST_SCSI_VQ_CTL
= 0,
161 VHOST_SCSI_VQ_EVT
= 1,
162 VHOST_SCSI_VQ_IO
= 2,
166 VHOST_SCSI_FEATURES
= VHOST_FEATURES
| (1ULL << VIRTIO_SCSI_F_HOTPLUG
)
169 #define VHOST_SCSI_MAX_TARGET 256
170 #define VHOST_SCSI_MAX_VQ 128
171 #define VHOST_SCSI_MAX_EVENT 128
173 struct vhost_scsi_virtqueue
{
174 struct vhost_virtqueue vq
;
176 * Reference counting for inflight reqs, used for flush operation. At
177 * each time, one reference tracks new commands submitted, while we
178 * wait for another one to reach 0.
180 struct vhost_scsi_inflight inflights
[2];
182 * Indicate current inflight in use, protected by vq->mutex.
183 * Writers must also take dev mutex and flush under it.
189 /* Protected by vhost_scsi->dev.mutex */
190 struct tcm_vhost_tpg
**vs_tpg
;
191 char vs_vhost_wwpn
[TRANSPORT_IQN_LEN
];
193 struct vhost_dev dev
;
194 struct vhost_scsi_virtqueue vqs
[VHOST_SCSI_MAX_VQ
];
196 struct vhost_work vs_completion_work
; /* cmd completion work item */
197 struct llist_head vs_completion_list
; /* cmd completion queue */
199 struct vhost_work vs_event_work
; /* evt injection work item */
200 struct llist_head vs_event_list
; /* evt injection queue */
202 bool vs_events_missed
; /* any missed events, protected by vq->mutex */
203 int vs_events_nr
; /* num of pending events, protected by vq->mutex */
206 /* Local pointer to allocated TCM configfs fabric module */
207 static struct target_fabric_configfs
*tcm_vhost_fabric_configfs
;
209 static struct workqueue_struct
*tcm_vhost_workqueue
;
211 /* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
212 static DEFINE_MUTEX(tcm_vhost_mutex
);
213 static LIST_HEAD(tcm_vhost_list
);
215 static int iov_num_pages(struct iovec
*iov
)
217 return (PAGE_ALIGN((unsigned long)iov
->iov_base
+ iov
->iov_len
) -
218 ((unsigned long)iov
->iov_base
& PAGE_MASK
)) >> PAGE_SHIFT
;
221 void tcm_vhost_done_inflight(struct kref
*kref
)
223 struct vhost_scsi_inflight
*inflight
;
225 inflight
= container_of(kref
, struct vhost_scsi_inflight
, kref
);
226 complete(&inflight
->comp
);
229 static void tcm_vhost_init_inflight(struct vhost_scsi
*vs
,
230 struct vhost_scsi_inflight
*old_inflight
[])
232 struct vhost_scsi_inflight
*new_inflight
;
233 struct vhost_virtqueue
*vq
;
236 for (i
= 0; i
< VHOST_SCSI_MAX_VQ
; i
++) {
239 mutex_lock(&vq
->mutex
);
241 /* store old infight */
242 idx
= vs
->vqs
[i
].inflight_idx
;
244 old_inflight
[i
] = &vs
->vqs
[i
].inflights
[idx
];
246 /* setup new infight */
247 vs
->vqs
[i
].inflight_idx
= idx
^ 1;
248 new_inflight
= &vs
->vqs
[i
].inflights
[idx
^ 1];
249 kref_init(&new_inflight
->kref
);
250 init_completion(&new_inflight
->comp
);
252 mutex_unlock(&vq
->mutex
);
256 static struct vhost_scsi_inflight
*
257 tcm_vhost_get_inflight(struct vhost_virtqueue
*vq
)
259 struct vhost_scsi_inflight
*inflight
;
260 struct vhost_scsi_virtqueue
*svq
;
262 svq
= container_of(vq
, struct vhost_scsi_virtqueue
, vq
);
263 inflight
= &svq
->inflights
[svq
->inflight_idx
];
264 kref_get(&inflight
->kref
);
269 static void tcm_vhost_put_inflight(struct vhost_scsi_inflight
*inflight
)
271 kref_put(&inflight
->kref
, tcm_vhost_done_inflight
);
274 static int tcm_vhost_check_true(struct se_portal_group
*se_tpg
)
279 static int tcm_vhost_check_false(struct se_portal_group
*se_tpg
)
284 static char *tcm_vhost_get_fabric_name(void)
289 static u8
tcm_vhost_get_fabric_proto_ident(struct se_portal_group
*se_tpg
)
291 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
292 struct tcm_vhost_tpg
, se_tpg
);
293 struct tcm_vhost_tport
*tport
= tpg
->tport
;
295 switch (tport
->tport_proto_id
) {
296 case SCSI_PROTOCOL_SAS
:
297 return sas_get_fabric_proto_ident(se_tpg
);
298 case SCSI_PROTOCOL_FCP
:
299 return fc_get_fabric_proto_ident(se_tpg
);
300 case SCSI_PROTOCOL_ISCSI
:
301 return iscsi_get_fabric_proto_ident(se_tpg
);
303 pr_err("Unknown tport_proto_id: 0x%02x, using"
304 " SAS emulation\n", tport
->tport_proto_id
);
308 return sas_get_fabric_proto_ident(se_tpg
);
311 static char *tcm_vhost_get_fabric_wwn(struct se_portal_group
*se_tpg
)
313 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
314 struct tcm_vhost_tpg
, se_tpg
);
315 struct tcm_vhost_tport
*tport
= tpg
->tport
;
317 return &tport
->tport_name
[0];
320 static u16
tcm_vhost_get_tag(struct se_portal_group
*se_tpg
)
322 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
323 struct tcm_vhost_tpg
, se_tpg
);
324 return tpg
->tport_tpgt
;
327 static u32
tcm_vhost_get_default_depth(struct se_portal_group
*se_tpg
)
332 static u32
tcm_vhost_get_pr_transport_id(struct se_portal_group
*se_tpg
,
333 struct se_node_acl
*se_nacl
,
334 struct t10_pr_registration
*pr_reg
,
338 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
339 struct tcm_vhost_tpg
, se_tpg
);
340 struct tcm_vhost_tport
*tport
= tpg
->tport
;
342 switch (tport
->tport_proto_id
) {
343 case SCSI_PROTOCOL_SAS
:
344 return sas_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
346 case SCSI_PROTOCOL_FCP
:
347 return fc_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
349 case SCSI_PROTOCOL_ISCSI
:
350 return iscsi_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
353 pr_err("Unknown tport_proto_id: 0x%02x, using"
354 " SAS emulation\n", tport
->tport_proto_id
);
358 return sas_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
362 static u32
tcm_vhost_get_pr_transport_id_len(struct se_portal_group
*se_tpg
,
363 struct se_node_acl
*se_nacl
,
364 struct t10_pr_registration
*pr_reg
,
367 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
368 struct tcm_vhost_tpg
, se_tpg
);
369 struct tcm_vhost_tport
*tport
= tpg
->tport
;
371 switch (tport
->tport_proto_id
) {
372 case SCSI_PROTOCOL_SAS
:
373 return sas_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
375 case SCSI_PROTOCOL_FCP
:
376 return fc_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
378 case SCSI_PROTOCOL_ISCSI
:
379 return iscsi_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
382 pr_err("Unknown tport_proto_id: 0x%02x, using"
383 " SAS emulation\n", tport
->tport_proto_id
);
387 return sas_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
391 static char *tcm_vhost_parse_pr_out_transport_id(struct se_portal_group
*se_tpg
,
394 char **port_nexus_ptr
)
396 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
397 struct tcm_vhost_tpg
, se_tpg
);
398 struct tcm_vhost_tport
*tport
= tpg
->tport
;
400 switch (tport
->tport_proto_id
) {
401 case SCSI_PROTOCOL_SAS
:
402 return sas_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
404 case SCSI_PROTOCOL_FCP
:
405 return fc_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
407 case SCSI_PROTOCOL_ISCSI
:
408 return iscsi_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
411 pr_err("Unknown tport_proto_id: 0x%02x, using"
412 " SAS emulation\n", tport
->tport_proto_id
);
416 return sas_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
420 static struct se_node_acl
*tcm_vhost_alloc_fabric_acl(
421 struct se_portal_group
*se_tpg
)
423 struct tcm_vhost_nacl
*nacl
;
425 nacl
= kzalloc(sizeof(struct tcm_vhost_nacl
), GFP_KERNEL
);
427 pr_err("Unable to allocate struct tcm_vhost_nacl\n");
431 return &nacl
->se_node_acl
;
434 static void tcm_vhost_release_fabric_acl(struct se_portal_group
*se_tpg
,
435 struct se_node_acl
*se_nacl
)
437 struct tcm_vhost_nacl
*nacl
= container_of(se_nacl
,
438 struct tcm_vhost_nacl
, se_node_acl
);
442 static u32
tcm_vhost_tpg_get_inst_index(struct se_portal_group
*se_tpg
)
447 static void tcm_vhost_release_cmd(struct se_cmd
*se_cmd
)
452 static int tcm_vhost_shutdown_session(struct se_session
*se_sess
)
457 static void tcm_vhost_close_session(struct se_session
*se_sess
)
462 static u32
tcm_vhost_sess_get_index(struct se_session
*se_sess
)
467 static int tcm_vhost_write_pending(struct se_cmd
*se_cmd
)
469 /* Go ahead and process the write immediately */
470 target_execute_cmd(se_cmd
);
474 static int tcm_vhost_write_pending_status(struct se_cmd
*se_cmd
)
479 static void tcm_vhost_set_default_node_attrs(struct se_node_acl
*nacl
)
484 static u32
tcm_vhost_get_task_tag(struct se_cmd
*se_cmd
)
489 static int tcm_vhost_get_cmd_state(struct se_cmd
*se_cmd
)
494 static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd
*tv_cmd
)
496 struct vhost_scsi
*vs
= tv_cmd
->tvc_vhost
;
498 llist_add(&tv_cmd
->tvc_completion_list
, &vs
->vs_completion_list
);
500 vhost_work_queue(&vs
->dev
, &vs
->vs_completion_work
);
503 static int tcm_vhost_queue_data_in(struct se_cmd
*se_cmd
)
505 struct tcm_vhost_cmd
*tv_cmd
= container_of(se_cmd
,
506 struct tcm_vhost_cmd
, tvc_se_cmd
);
507 vhost_scsi_complete_cmd(tv_cmd
);
511 static int tcm_vhost_queue_status(struct se_cmd
*se_cmd
)
513 struct tcm_vhost_cmd
*tv_cmd
= container_of(se_cmd
,
514 struct tcm_vhost_cmd
, tvc_se_cmd
);
515 vhost_scsi_complete_cmd(tv_cmd
);
519 static int tcm_vhost_queue_tm_rsp(struct se_cmd
*se_cmd
)
524 static void tcm_vhost_free_evt(struct vhost_scsi
*vs
, struct tcm_vhost_evt
*evt
)
530 static struct tcm_vhost_evt
*tcm_vhost_allocate_evt(struct vhost_scsi
*vs
,
531 u32 event
, u32 reason
)
533 struct vhost_virtqueue
*vq
= &vs
->vqs
[VHOST_SCSI_VQ_EVT
].vq
;
534 struct tcm_vhost_evt
*evt
;
536 if (vs
->vs_events_nr
> VHOST_SCSI_MAX_EVENT
) {
537 vs
->vs_events_missed
= true;
541 evt
= kzalloc(sizeof(*evt
), GFP_KERNEL
);
543 vq_err(vq
, "Failed to allocate tcm_vhost_evt\n");
544 vs
->vs_events_missed
= true;
548 evt
->event
.event
= event
;
549 evt
->event
.reason
= reason
;
555 static void vhost_scsi_free_cmd(struct tcm_vhost_cmd
*tv_cmd
)
557 struct se_cmd
*se_cmd
= &tv_cmd
->tvc_se_cmd
;
559 /* TODO locking against target/backend threads? */
560 transport_generic_free_cmd(se_cmd
, 1);
562 if (tv_cmd
->tvc_sgl_count
) {
564 for (i
= 0; i
< tv_cmd
->tvc_sgl_count
; i
++)
565 put_page(sg_page(&tv_cmd
->tvc_sgl
[i
]));
567 kfree(tv_cmd
->tvc_sgl
);
570 tcm_vhost_put_inflight(tv_cmd
->inflight
);
575 static void tcm_vhost_do_evt_work(struct vhost_scsi
*vs
,
576 struct tcm_vhost_evt
*evt
)
578 struct vhost_virtqueue
*vq
= &vs
->vqs
[VHOST_SCSI_VQ_EVT
].vq
;
579 struct virtio_scsi_event
*event
= &evt
->event
;
580 struct virtio_scsi_event __user
*eventp
;
584 if (!vq
->private_data
) {
585 vs
->vs_events_missed
= true;
590 vhost_disable_notify(&vs
->dev
, vq
);
591 head
= vhost_get_vq_desc(&vs
->dev
, vq
, vq
->iov
,
592 ARRAY_SIZE(vq
->iov
), &out
, &in
,
595 vs
->vs_events_missed
= true;
598 if (head
== vq
->num
) {
599 if (vhost_enable_notify(&vs
->dev
, vq
))
601 vs
->vs_events_missed
= true;
605 if ((vq
->iov
[out
].iov_len
!= sizeof(struct virtio_scsi_event
))) {
606 vq_err(vq
, "Expecting virtio_scsi_event, got %zu bytes\n",
607 vq
->iov
[out
].iov_len
);
608 vs
->vs_events_missed
= true;
612 if (vs
->vs_events_missed
) {
613 event
->event
|= VIRTIO_SCSI_T_EVENTS_MISSED
;
614 vs
->vs_events_missed
= false;
617 eventp
= vq
->iov
[out
].iov_base
;
618 ret
= __copy_to_user(eventp
, event
, sizeof(*event
));
620 vhost_add_used_and_signal(&vs
->dev
, vq
, head
, 0);
622 vq_err(vq
, "Faulted on tcm_vhost_send_event\n");
625 static void tcm_vhost_evt_work(struct vhost_work
*work
)
627 struct vhost_scsi
*vs
= container_of(work
, struct vhost_scsi
,
629 struct vhost_virtqueue
*vq
= &vs
->vqs
[VHOST_SCSI_VQ_EVT
].vq
;
630 struct tcm_vhost_evt
*evt
;
631 struct llist_node
*llnode
;
633 mutex_lock(&vq
->mutex
);
634 llnode
= llist_del_all(&vs
->vs_event_list
);
636 evt
= llist_entry(llnode
, struct tcm_vhost_evt
, list
);
637 llnode
= llist_next(llnode
);
638 tcm_vhost_do_evt_work(vs
, evt
);
639 tcm_vhost_free_evt(vs
, evt
);
641 mutex_unlock(&vq
->mutex
);
644 /* Fill in status and signal that we are done processing this command
646 * This is scheduled in the vhost work queue so we are called with the owner
647 * process mm and can access the vring.
649 static void vhost_scsi_complete_cmd_work(struct vhost_work
*work
)
651 struct vhost_scsi
*vs
= container_of(work
, struct vhost_scsi
,
653 DECLARE_BITMAP(signal
, VHOST_SCSI_MAX_VQ
);
654 struct virtio_scsi_cmd_resp v_rsp
;
655 struct tcm_vhost_cmd
*tv_cmd
;
656 struct llist_node
*llnode
;
657 struct se_cmd
*se_cmd
;
660 bitmap_zero(signal
, VHOST_SCSI_MAX_VQ
);
661 llnode
= llist_del_all(&vs
->vs_completion_list
);
663 tv_cmd
= llist_entry(llnode
, struct tcm_vhost_cmd
,
664 tvc_completion_list
);
665 llnode
= llist_next(llnode
);
666 se_cmd
= &tv_cmd
->tvc_se_cmd
;
668 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__
,
669 tv_cmd
, se_cmd
->residual_count
, se_cmd
->scsi_status
);
671 memset(&v_rsp
, 0, sizeof(v_rsp
));
672 v_rsp
.resid
= se_cmd
->residual_count
;
673 /* TODO is status_qualifier field needed? */
674 v_rsp
.status
= se_cmd
->scsi_status
;
675 v_rsp
.sense_len
= se_cmd
->scsi_sense_length
;
676 memcpy(v_rsp
.sense
, tv_cmd
->tvc_sense_buf
,
678 ret
= copy_to_user(tv_cmd
->tvc_resp
, &v_rsp
, sizeof(v_rsp
));
679 if (likely(ret
== 0)) {
680 struct vhost_scsi_virtqueue
*q
;
681 vhost_add_used(tv_cmd
->tvc_vq
, tv_cmd
->tvc_vq_desc
, 0);
682 q
= container_of(tv_cmd
->tvc_vq
, struct vhost_scsi_virtqueue
, vq
);
684 __set_bit(vq
, signal
);
686 pr_err("Faulted on virtio_scsi_cmd_resp\n");
688 vhost_scsi_free_cmd(tv_cmd
);
692 while ((vq
= find_next_bit(signal
, VHOST_SCSI_MAX_VQ
, vq
+ 1))
694 vhost_signal(&vs
->dev
, &vs
->vqs
[vq
].vq
);
697 static struct tcm_vhost_cmd
*vhost_scsi_allocate_cmd(
698 struct vhost_virtqueue
*vq
,
699 struct tcm_vhost_tpg
*tv_tpg
,
700 struct virtio_scsi_cmd_req
*v_req
,
704 struct tcm_vhost_cmd
*tv_cmd
;
705 struct tcm_vhost_nexus
*tv_nexus
;
707 tv_nexus
= tv_tpg
->tpg_nexus
;
709 pr_err("Unable to locate active struct tcm_vhost_nexus\n");
710 return ERR_PTR(-EIO
);
713 tv_cmd
= kzalloc(sizeof(struct tcm_vhost_cmd
), GFP_ATOMIC
);
715 pr_err("Unable to allocate struct tcm_vhost_cmd\n");
716 return ERR_PTR(-ENOMEM
);
718 tv_cmd
->tvc_tag
= v_req
->tag
;
719 tv_cmd
->tvc_task_attr
= v_req
->task_attr
;
720 tv_cmd
->tvc_exp_data_len
= exp_data_len
;
721 tv_cmd
->tvc_data_direction
= data_direction
;
722 tv_cmd
->tvc_nexus
= tv_nexus
;
723 tv_cmd
->inflight
= tcm_vhost_get_inflight(vq
);
729 * Map a user memory range into a scatterlist
731 * Returns the number of scatterlist entries used or -errno on error.
733 static int vhost_scsi_map_to_sgl(struct scatterlist
*sgl
,
734 unsigned int sgl_count
, struct iovec
*iov
, int write
)
736 unsigned int npages
= 0, pages_nr
, offset
, nbytes
;
737 struct scatterlist
*sg
= sgl
;
738 void __user
*ptr
= iov
->iov_base
;
739 size_t len
= iov
->iov_len
;
743 pages_nr
= iov_num_pages(iov
);
744 if (pages_nr
> sgl_count
)
747 pages
= kmalloc(pages_nr
* sizeof(struct page
*), GFP_KERNEL
);
751 ret
= get_user_pages_fast((unsigned long)ptr
, pages_nr
, write
, pages
);
752 /* No pages were pinned */
755 /* Less pages pinned than wanted */
756 if (ret
!= pages_nr
) {
757 for (i
= 0; i
< ret
; i
++)
764 offset
= (uintptr_t)ptr
& ~PAGE_MASK
;
765 nbytes
= min_t(unsigned int, PAGE_SIZE
- offset
, len
);
766 sg_set_page(sg
, pages
[npages
], nbytes
, offset
);
778 static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd
*tv_cmd
,
779 struct iovec
*iov
, unsigned int niov
, int write
)
784 struct scatterlist
*sg
;
787 * Find out how long sglist needs to be
790 for (i
= 0; i
< niov
; i
++)
791 sgl_count
+= iov_num_pages(&iov
[i
]);
793 /* TODO overflow checking */
795 sg
= kmalloc(sizeof(tv_cmd
->tvc_sgl
[0]) * sgl_count
, GFP_ATOMIC
);
798 pr_debug("%s sg %p sgl_count %u is_err %d\n", __func__
,
800 sg_init_table(sg
, sgl_count
);
802 tv_cmd
->tvc_sgl
= sg
;
803 tv_cmd
->tvc_sgl_count
= sgl_count
;
805 pr_debug("Mapping %u iovecs for %u pages\n", niov
, sgl_count
);
806 for (i
= 0; i
< niov
; i
++) {
807 ret
= vhost_scsi_map_to_sgl(sg
, sgl_count
, &iov
[i
], write
);
809 for (i
= 0; i
< tv_cmd
->tvc_sgl_count
; i
++)
810 put_page(sg_page(&tv_cmd
->tvc_sgl
[i
]));
811 kfree(tv_cmd
->tvc_sgl
);
812 tv_cmd
->tvc_sgl
= NULL
;
813 tv_cmd
->tvc_sgl_count
= 0;
823 static int vhost_scsi_to_tcm_attr(int attr
)
826 case VIRTIO_SCSI_S_SIMPLE
:
827 return MSG_SIMPLE_TAG
;
828 case VIRTIO_SCSI_S_ORDERED
:
829 return MSG_ORDERED_TAG
;
830 case VIRTIO_SCSI_S_HEAD
:
832 case VIRTIO_SCSI_S_ACA
:
837 return MSG_SIMPLE_TAG
;
840 static void tcm_vhost_submission_work(struct work_struct
*work
)
842 struct tcm_vhost_cmd
*tv_cmd
=
843 container_of(work
, struct tcm_vhost_cmd
, work
);
844 struct tcm_vhost_nexus
*tv_nexus
;
845 struct se_cmd
*se_cmd
= &tv_cmd
->tvc_se_cmd
;
846 struct scatterlist
*sg_ptr
, *sg_bidi_ptr
= NULL
;
847 int rc
, sg_no_bidi
= 0;
849 if (tv_cmd
->tvc_sgl_count
) {
850 sg_ptr
= tv_cmd
->tvc_sgl
;
851 /* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
853 if (se_cmd
->se_cmd_flags
& SCF_BIDI
) {
861 tv_nexus
= tv_cmd
->tvc_nexus
;
863 rc
= target_submit_cmd_map_sgls(se_cmd
, tv_nexus
->tvn_se_sess
,
864 tv_cmd
->tvc_cdb
, &tv_cmd
->tvc_sense_buf
[0],
865 tv_cmd
->tvc_lun
, tv_cmd
->tvc_exp_data_len
,
866 vhost_scsi_to_tcm_attr(tv_cmd
->tvc_task_attr
),
867 tv_cmd
->tvc_data_direction
, 0, sg_ptr
,
868 tv_cmd
->tvc_sgl_count
, sg_bidi_ptr
, sg_no_bidi
);
870 transport_send_check_condition_and_sense(se_cmd
,
871 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
872 transport_generic_free_cmd(se_cmd
, 0);
876 static void vhost_scsi_send_bad_target(struct vhost_scsi
*vs
,
877 struct vhost_virtqueue
*vq
, int head
, unsigned out
)
879 struct virtio_scsi_cmd_resp __user
*resp
;
880 struct virtio_scsi_cmd_resp rsp
;
883 memset(&rsp
, 0, sizeof(rsp
));
884 rsp
.response
= VIRTIO_SCSI_S_BAD_TARGET
;
885 resp
= vq
->iov
[out
].iov_base
;
886 ret
= __copy_to_user(resp
, &rsp
, sizeof(rsp
));
888 vhost_add_used_and_signal(&vs
->dev
, vq
, head
, 0);
890 pr_err("Faulted on virtio_scsi_cmd_resp\n");
893 static void vhost_scsi_handle_vq(struct vhost_scsi
*vs
,
894 struct vhost_virtqueue
*vq
)
896 struct tcm_vhost_tpg
**vs_tpg
;
897 struct virtio_scsi_cmd_req v_req
;
898 struct tcm_vhost_tpg
*tv_tpg
;
899 struct tcm_vhost_cmd
*tv_cmd
;
900 u32 exp_data_len
, data_first
, data_num
, data_direction
;
906 * We can handle the vq only after the endpoint is setup by calling the
907 * VHOST_SCSI_SET_ENDPOINT ioctl.
909 * TODO: Check that we are running from vhost_worker which acts
910 * as read-side critical section for vhost kind of RCU.
911 * See the comments in struct vhost_virtqueue in drivers/vhost/vhost.h
913 vs_tpg
= rcu_dereference_check(vq
->private_data
, 1);
917 mutex_lock(&vq
->mutex
);
918 vhost_disable_notify(&vs
->dev
, vq
);
921 head
= vhost_get_vq_desc(&vs
->dev
, vq
, vq
->iov
,
922 ARRAY_SIZE(vq
->iov
), &out
, &in
,
924 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
926 /* On error, stop handling until the next kick. */
927 if (unlikely(head
< 0))
929 /* Nothing new? Wait for eventfd to tell us they refilled. */
930 if (head
== vq
->num
) {
931 if (unlikely(vhost_enable_notify(&vs
->dev
, vq
))) {
932 vhost_disable_notify(&vs
->dev
, vq
);
938 /* FIXME: BIDI operation */
939 if (out
== 1 && in
== 1) {
940 data_direction
= DMA_NONE
;
943 } else if (out
== 1 && in
> 1) {
944 data_direction
= DMA_FROM_DEVICE
;
945 data_first
= out
+ 1;
947 } else if (out
> 1 && in
== 1) {
948 data_direction
= DMA_TO_DEVICE
;
952 vq_err(vq
, "Invalid buffer layout out: %u in: %u\n",
958 * Check for a sane resp buffer so we can report errors to
961 if (unlikely(vq
->iov
[out
].iov_len
!=
962 sizeof(struct virtio_scsi_cmd_resp
))) {
963 vq_err(vq
, "Expecting virtio_scsi_cmd_resp, got %zu"
964 " bytes\n", vq
->iov
[out
].iov_len
);
968 if (unlikely(vq
->iov
[0].iov_len
!= sizeof(v_req
))) {
969 vq_err(vq
, "Expecting virtio_scsi_cmd_req, got %zu"
970 " bytes\n", vq
->iov
[0].iov_len
);
973 pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
974 " len: %zu\n", vq
->iov
[0].iov_base
, sizeof(v_req
));
975 ret
= __copy_from_user(&v_req
, vq
->iov
[0].iov_base
,
978 vq_err(vq
, "Faulted on virtio_scsi_cmd_req\n");
982 /* Extract the tpgt */
983 target
= v_req
.lun
[1];
984 tv_tpg
= ACCESS_ONCE(vs_tpg
[target
]);
986 /* Target does not exist, fail the request */
987 if (unlikely(!tv_tpg
)) {
988 vhost_scsi_send_bad_target(vs
, vq
, head
, out
);
993 for (i
= 0; i
< data_num
; i
++)
994 exp_data_len
+= vq
->iov
[data_first
+ i
].iov_len
;
996 tv_cmd
= vhost_scsi_allocate_cmd(vq
, tv_tpg
, &v_req
,
997 exp_data_len
, data_direction
);
998 if (IS_ERR(tv_cmd
)) {
999 vq_err(vq
, "vhost_scsi_allocate_cmd failed %ld\n",
1003 pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
1004 ": %d\n", tv_cmd
, exp_data_len
, data_direction
);
1006 tv_cmd
->tvc_vhost
= vs
;
1007 tv_cmd
->tvc_vq
= vq
;
1008 tv_cmd
->tvc_resp
= vq
->iov
[out
].iov_base
;
1011 * Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
1012 * that will be used by tcm_vhost_new_cmd_map() and down into
1013 * target_setup_cmd_from_cdb()
1015 memcpy(tv_cmd
->tvc_cdb
, v_req
.cdb
, TCM_VHOST_MAX_CDB_SIZE
);
1017 * Check that the recieved CDB size does not exceeded our
1018 * hardcoded max for tcm_vhost
1020 /* TODO what if cdb was too small for varlen cdb header? */
1021 if (unlikely(scsi_command_size(tv_cmd
->tvc_cdb
) >
1022 TCM_VHOST_MAX_CDB_SIZE
)) {
1023 vq_err(vq
, "Received SCSI CDB with command_size: %d that"
1024 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1025 scsi_command_size(tv_cmd
->tvc_cdb
),
1026 TCM_VHOST_MAX_CDB_SIZE
);
1029 tv_cmd
->tvc_lun
= ((v_req
.lun
[2] << 8) | v_req
.lun
[3]) & 0x3FFF;
1031 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1032 tv_cmd
->tvc_cdb
[0], tv_cmd
->tvc_lun
);
1034 if (data_direction
!= DMA_NONE
) {
1035 ret
= vhost_scsi_map_iov_to_sgl(tv_cmd
,
1036 &vq
->iov
[data_first
], data_num
,
1037 data_direction
== DMA_FROM_DEVICE
);
1038 if (unlikely(ret
)) {
1039 vq_err(vq
, "Failed to map iov to sgl\n");
1045 * Save the descriptor from vhost_get_vq_desc() to be used to
1046 * complete the virtio-scsi request in TCM callback context via
1047 * tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
1049 tv_cmd
->tvc_vq_desc
= head
;
1051 * Dispatch tv_cmd descriptor for cmwq execution in process
1052 * context provided by tcm_vhost_workqueue. This also ensures
1053 * tv_cmd is executed on the same kworker CPU as this vhost
1054 * thread to gain positive L2 cache locality effects..
1056 INIT_WORK(&tv_cmd
->work
, tcm_vhost_submission_work
);
1057 queue_work(tcm_vhost_workqueue
, &tv_cmd
->work
);
1060 mutex_unlock(&vq
->mutex
);
1064 vhost_scsi_free_cmd(tv_cmd
);
1066 vhost_scsi_send_bad_target(vs
, vq
, head
, out
);
1067 mutex_unlock(&vq
->mutex
);
1070 static void vhost_scsi_ctl_handle_kick(struct vhost_work
*work
)
1072 pr_debug("%s: The handling func for control queue.\n", __func__
);
1075 static void tcm_vhost_send_evt(struct vhost_scsi
*vs
, struct tcm_vhost_tpg
*tpg
,
1076 struct se_lun
*lun
, u32 event
, u32 reason
)
1078 struct tcm_vhost_evt
*evt
;
1080 evt
= tcm_vhost_allocate_evt(vs
, event
, reason
);
1085 /* TODO: share lun setup code with virtio-scsi.ko */
1087 * Note: evt->event is zeroed when we allocate it and
1088 * lun[4-7] need to be zero according to virtio-scsi spec.
1090 evt
->event
.lun
[0] = 0x01;
1091 evt
->event
.lun
[1] = tpg
->tport_tpgt
;
1092 if (lun
->unpacked_lun
>= 256)
1093 evt
->event
.lun
[2] = lun
->unpacked_lun
>> 8 | 0x40 ;
1094 evt
->event
.lun
[3] = lun
->unpacked_lun
& 0xFF;
1097 llist_add(&evt
->list
, &vs
->vs_event_list
);
1098 vhost_work_queue(&vs
->dev
, &vs
->vs_event_work
);
1101 static void vhost_scsi_evt_handle_kick(struct vhost_work
*work
)
1103 struct vhost_virtqueue
*vq
= container_of(work
, struct vhost_virtqueue
,
1105 struct vhost_scsi
*vs
= container_of(vq
->dev
, struct vhost_scsi
, dev
);
1107 mutex_lock(&vq
->mutex
);
1108 if (!vq
->private_data
)
1111 if (vs
->vs_events_missed
)
1112 tcm_vhost_send_evt(vs
, NULL
, NULL
, VIRTIO_SCSI_T_NO_EVENT
, 0);
1114 mutex_unlock(&vq
->mutex
);
1117 static void vhost_scsi_handle_kick(struct vhost_work
*work
)
1119 struct vhost_virtqueue
*vq
= container_of(work
, struct vhost_virtqueue
,
1121 struct vhost_scsi
*vs
= container_of(vq
->dev
, struct vhost_scsi
, dev
);
1123 vhost_scsi_handle_vq(vs
, vq
);
1126 static void vhost_scsi_flush_vq(struct vhost_scsi
*vs
, int index
)
1128 vhost_poll_flush(&vs
->vqs
[index
].vq
.poll
);
1131 /* Callers must hold dev mutex */
1132 static void vhost_scsi_flush(struct vhost_scsi
*vs
)
1134 struct vhost_scsi_inflight
*old_inflight
[VHOST_SCSI_MAX_VQ
];
1137 /* Init new inflight and remember the old inflight */
1138 tcm_vhost_init_inflight(vs
, old_inflight
);
1141 * The inflight->kref was initialized to 1. We decrement it here to
1142 * indicate the start of the flush operation so that it will reach 0
1143 * when all the reqs are finished.
1145 for (i
= 0; i
< VHOST_SCSI_MAX_VQ
; i
++)
1146 kref_put(&old_inflight
[i
]->kref
, tcm_vhost_done_inflight
);
1148 /* Flush both the vhost poll and vhost work */
1149 for (i
= 0; i
< VHOST_SCSI_MAX_VQ
; i
++)
1150 vhost_scsi_flush_vq(vs
, i
);
1151 vhost_work_flush(&vs
->dev
, &vs
->vs_completion_work
);
1152 vhost_work_flush(&vs
->dev
, &vs
->vs_event_work
);
1154 /* Wait for all reqs issued before the flush to be finished */
1155 for (i
= 0; i
< VHOST_SCSI_MAX_VQ
; i
++)
1156 wait_for_completion(&old_inflight
[i
]->comp
);
1160 * Called from vhost_scsi_ioctl() context to walk the list of available
1161 * tcm_vhost_tpg with an active struct tcm_vhost_nexus
1163 * The lock nesting rule is:
1164 * tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
1166 static int vhost_scsi_set_endpoint(
1167 struct vhost_scsi
*vs
,
1168 struct vhost_scsi_target
*t
)
1170 struct se_portal_group
*se_tpg
;
1171 struct tcm_vhost_tport
*tv_tport
;
1172 struct tcm_vhost_tpg
*tv_tpg
;
1173 struct tcm_vhost_tpg
**vs_tpg
;
1174 struct vhost_virtqueue
*vq
;
1175 int index
, ret
, i
, len
;
1178 mutex_lock(&tcm_vhost_mutex
);
1179 mutex_lock(&vs
->dev
.mutex
);
1181 /* Verify that ring has been setup correctly. */
1182 for (index
= 0; index
< vs
->dev
.nvqs
; ++index
) {
1183 /* Verify that ring has been setup correctly. */
1184 if (!vhost_vq_access_ok(&vs
->vqs
[index
].vq
)) {
1190 len
= sizeof(vs_tpg
[0]) * VHOST_SCSI_MAX_TARGET
;
1191 vs_tpg
= kzalloc(len
, GFP_KERNEL
);
1197 memcpy(vs_tpg
, vs
->vs_tpg
, len
);
1199 list_for_each_entry(tv_tpg
, &tcm_vhost_list
, tv_tpg_list
) {
1200 mutex_lock(&tv_tpg
->tv_tpg_mutex
);
1201 if (!tv_tpg
->tpg_nexus
) {
1202 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1205 if (tv_tpg
->tv_tpg_vhost_count
!= 0) {
1206 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1209 tv_tport
= tv_tpg
->tport
;
1211 if (!strcmp(tv_tport
->tport_name
, t
->vhost_wwpn
)) {
1212 if (vs
->vs_tpg
&& vs
->vs_tpg
[tv_tpg
->tport_tpgt
]) {
1214 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1219 * In order to ensure individual vhost-scsi configfs
1220 * groups cannot be removed while in use by vhost ioctl,
1221 * go ahead and take an explicit se_tpg->tpg_group.cg_item
1224 se_tpg
= &tv_tpg
->se_tpg
;
1225 ret
= configfs_depend_item(se_tpg
->se_tpg_tfo
->tf_subsys
,
1226 &se_tpg
->tpg_group
.cg_item
);
1228 pr_warn("configfs_depend_item() failed: %d\n", ret
);
1230 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1233 tv_tpg
->tv_tpg_vhost_count
++;
1234 tv_tpg
->vhost_scsi
= vs
;
1235 vs_tpg
[tv_tpg
->tport_tpgt
] = tv_tpg
;
1236 smp_mb__after_atomic_inc();
1239 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1243 memcpy(vs
->vs_vhost_wwpn
, t
->vhost_wwpn
,
1244 sizeof(vs
->vs_vhost_wwpn
));
1245 for (i
= 0; i
< VHOST_SCSI_MAX_VQ
; i
++) {
1246 vq
= &vs
->vqs
[i
].vq
;
1247 /* Flushing the vhost_work acts as synchronize_rcu */
1248 mutex_lock(&vq
->mutex
);
1249 rcu_assign_pointer(vq
->private_data
, vs_tpg
);
1250 vhost_init_used(vq
);
1251 mutex_unlock(&vq
->mutex
);
1259 * Act as synchronize_rcu to make sure access to
1260 * old vs->vs_tpg is finished.
1262 vhost_scsi_flush(vs
);
1264 vs
->vs_tpg
= vs_tpg
;
1267 mutex_unlock(&vs
->dev
.mutex
);
1268 mutex_unlock(&tcm_vhost_mutex
);
1272 static int vhost_scsi_clear_endpoint(
1273 struct vhost_scsi
*vs
,
1274 struct vhost_scsi_target
*t
)
1276 struct se_portal_group
*se_tpg
;
1277 struct tcm_vhost_tport
*tv_tport
;
1278 struct tcm_vhost_tpg
*tv_tpg
;
1279 struct vhost_virtqueue
*vq
;
1284 mutex_lock(&tcm_vhost_mutex
);
1285 mutex_lock(&vs
->dev
.mutex
);
1286 /* Verify that ring has been setup correctly. */
1287 for (index
= 0; index
< vs
->dev
.nvqs
; ++index
) {
1288 if (!vhost_vq_access_ok(&vs
->vqs
[index
].vq
)) {
1299 for (i
= 0; i
< VHOST_SCSI_MAX_TARGET
; i
++) {
1301 tv_tpg
= vs
->vs_tpg
[target
];
1305 mutex_lock(&tv_tpg
->tv_tpg_mutex
);
1306 tv_tport
= tv_tpg
->tport
;
1312 if (strcmp(tv_tport
->tport_name
, t
->vhost_wwpn
)) {
1313 pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
1314 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1315 tv_tport
->tport_name
, tv_tpg
->tport_tpgt
,
1316 t
->vhost_wwpn
, t
->vhost_tpgt
);
1320 tv_tpg
->tv_tpg_vhost_count
--;
1321 tv_tpg
->vhost_scsi
= NULL
;
1322 vs
->vs_tpg
[target
] = NULL
;
1324 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1326 * Release se_tpg->tpg_group.cg_item configfs dependency now
1327 * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur.
1329 se_tpg
= &tv_tpg
->se_tpg
;
1330 configfs_undepend_item(se_tpg
->se_tpg_tfo
->tf_subsys
,
1331 &se_tpg
->tpg_group
.cg_item
);
1334 for (i
= 0; i
< VHOST_SCSI_MAX_VQ
; i
++) {
1335 vq
= &vs
->vqs
[i
].vq
;
1336 /* Flushing the vhost_work acts as synchronize_rcu */
1337 mutex_lock(&vq
->mutex
);
1338 rcu_assign_pointer(vq
->private_data
, NULL
);
1339 mutex_unlock(&vq
->mutex
);
1343 * Act as synchronize_rcu to make sure access to
1344 * old vs->vs_tpg is finished.
1346 vhost_scsi_flush(vs
);
1349 WARN_ON(vs
->vs_events_nr
);
1350 mutex_unlock(&vs
->dev
.mutex
);
1351 mutex_unlock(&tcm_vhost_mutex
);
1355 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1357 mutex_unlock(&vs
->dev
.mutex
);
1358 mutex_unlock(&tcm_vhost_mutex
);
1362 static int vhost_scsi_set_features(struct vhost_scsi
*vs
, u64 features
)
1364 if (features
& ~VHOST_SCSI_FEATURES
)
1367 mutex_lock(&vs
->dev
.mutex
);
1368 if ((features
& (1 << VHOST_F_LOG_ALL
)) &&
1369 !vhost_log_access_ok(&vs
->dev
)) {
1370 mutex_unlock(&vs
->dev
.mutex
);
1373 vs
->dev
.acked_features
= features
;
1375 vhost_scsi_flush(vs
);
1376 mutex_unlock(&vs
->dev
.mutex
);
1380 static int vhost_scsi_open(struct inode
*inode
, struct file
*f
)
1382 struct vhost_scsi
*s
;
1383 struct vhost_virtqueue
**vqs
;
1386 s
= kzalloc(sizeof(*s
), GFP_KERNEL
);
1390 vqs
= kmalloc(VHOST_SCSI_MAX_VQ
* sizeof(*vqs
), GFP_KERNEL
);
1396 vhost_work_init(&s
->vs_completion_work
, vhost_scsi_complete_cmd_work
);
1397 vhost_work_init(&s
->vs_event_work
, tcm_vhost_evt_work
);
1399 s
->vs_events_nr
= 0;
1400 s
->vs_events_missed
= false;
1402 vqs
[VHOST_SCSI_VQ_CTL
] = &s
->vqs
[VHOST_SCSI_VQ_CTL
].vq
;
1403 vqs
[VHOST_SCSI_VQ_EVT
] = &s
->vqs
[VHOST_SCSI_VQ_EVT
].vq
;
1404 s
->vqs
[VHOST_SCSI_VQ_CTL
].vq
.handle_kick
= vhost_scsi_ctl_handle_kick
;
1405 s
->vqs
[VHOST_SCSI_VQ_EVT
].vq
.handle_kick
= vhost_scsi_evt_handle_kick
;
1406 for (i
= VHOST_SCSI_VQ_IO
; i
< VHOST_SCSI_MAX_VQ
; i
++) {
1407 vqs
[i
] = &s
->vqs
[i
].vq
;
1408 s
->vqs
[i
].vq
.handle_kick
= vhost_scsi_handle_kick
;
1410 r
= vhost_dev_init(&s
->dev
, vqs
, VHOST_SCSI_MAX_VQ
);
1412 tcm_vhost_init_inflight(s
, NULL
);
1420 f
->private_data
= s
;
1424 static int vhost_scsi_release(struct inode
*inode
, struct file
*f
)
1426 struct vhost_scsi
*s
= f
->private_data
;
1427 struct vhost_scsi_target t
;
1429 mutex_lock(&s
->dev
.mutex
);
1430 memcpy(t
.vhost_wwpn
, s
->vs_vhost_wwpn
, sizeof(t
.vhost_wwpn
));
1431 mutex_unlock(&s
->dev
.mutex
);
1432 vhost_scsi_clear_endpoint(s
, &t
);
1433 vhost_dev_stop(&s
->dev
);
1434 vhost_dev_cleanup(&s
->dev
, false);
1435 /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
1436 vhost_scsi_flush(s
);
1442 static long vhost_scsi_ioctl(struct file
*f
, unsigned int ioctl
,
1445 struct vhost_scsi
*vs
= f
->private_data
;
1446 struct vhost_scsi_target backend
;
1447 void __user
*argp
= (void __user
*)arg
;
1448 u64 __user
*featurep
= argp
;
1449 u32 __user
*eventsp
= argp
;
1452 int r
, abi_version
= VHOST_SCSI_ABI_VERSION
;
1453 struct vhost_virtqueue
*vq
= &vs
->vqs
[VHOST_SCSI_VQ_EVT
].vq
;
1456 case VHOST_SCSI_SET_ENDPOINT
:
1457 if (copy_from_user(&backend
, argp
, sizeof backend
))
1459 if (backend
.reserved
!= 0)
1462 return vhost_scsi_set_endpoint(vs
, &backend
);
1463 case VHOST_SCSI_CLEAR_ENDPOINT
:
1464 if (copy_from_user(&backend
, argp
, sizeof backend
))
1466 if (backend
.reserved
!= 0)
1469 return vhost_scsi_clear_endpoint(vs
, &backend
);
1470 case VHOST_SCSI_GET_ABI_VERSION
:
1471 if (copy_to_user(argp
, &abi_version
, sizeof abi_version
))
1474 case VHOST_SCSI_SET_EVENTS_MISSED
:
1475 if (get_user(events_missed
, eventsp
))
1477 mutex_lock(&vq
->mutex
);
1478 vs
->vs_events_missed
= events_missed
;
1479 mutex_unlock(&vq
->mutex
);
1481 case VHOST_SCSI_GET_EVENTS_MISSED
:
1482 mutex_lock(&vq
->mutex
);
1483 events_missed
= vs
->vs_events_missed
;
1484 mutex_unlock(&vq
->mutex
);
1485 if (put_user(events_missed
, eventsp
))
1488 case VHOST_GET_FEATURES
:
1489 features
= VHOST_SCSI_FEATURES
;
1490 if (copy_to_user(featurep
, &features
, sizeof features
))
1493 case VHOST_SET_FEATURES
:
1494 if (copy_from_user(&features
, featurep
, sizeof features
))
1496 return vhost_scsi_set_features(vs
, features
);
1498 mutex_lock(&vs
->dev
.mutex
);
1499 r
= vhost_dev_ioctl(&vs
->dev
, ioctl
, argp
);
1500 /* TODO: flush backend after dev ioctl. */
1501 if (r
== -ENOIOCTLCMD
)
1502 r
= vhost_vring_ioctl(&vs
->dev
, ioctl
, argp
);
1503 mutex_unlock(&vs
->dev
.mutex
);
1508 #ifdef CONFIG_COMPAT
1509 static long vhost_scsi_compat_ioctl(struct file
*f
, unsigned int ioctl
,
1512 return vhost_scsi_ioctl(f
, ioctl
, (unsigned long)compat_ptr(arg
));
1516 static const struct file_operations vhost_scsi_fops
= {
1517 .owner
= THIS_MODULE
,
1518 .release
= vhost_scsi_release
,
1519 .unlocked_ioctl
= vhost_scsi_ioctl
,
1520 #ifdef CONFIG_COMPAT
1521 .compat_ioctl
= vhost_scsi_compat_ioctl
,
1523 .open
= vhost_scsi_open
,
1524 .llseek
= noop_llseek
,
1527 static struct miscdevice vhost_scsi_misc
= {
1533 static int __init
vhost_scsi_register(void)
1535 return misc_register(&vhost_scsi_misc
);
1538 static int vhost_scsi_deregister(void)
1540 return misc_deregister(&vhost_scsi_misc
);
1543 static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport
*tport
)
1545 switch (tport
->tport_proto_id
) {
1546 case SCSI_PROTOCOL_SAS
:
1548 case SCSI_PROTOCOL_FCP
:
1550 case SCSI_PROTOCOL_ISCSI
:
1559 static void tcm_vhost_do_plug(struct tcm_vhost_tpg
*tpg
,
1560 struct se_lun
*lun
, bool plug
)
1563 struct vhost_scsi
*vs
= tpg
->vhost_scsi
;
1564 struct vhost_virtqueue
*vq
;
1570 mutex_lock(&vs
->dev
.mutex
);
1571 if (!vhost_has_feature(&vs
->dev
, VIRTIO_SCSI_F_HOTPLUG
)) {
1572 mutex_unlock(&vs
->dev
.mutex
);
1577 reason
= VIRTIO_SCSI_EVT_RESET_RESCAN
;
1579 reason
= VIRTIO_SCSI_EVT_RESET_REMOVED
;
1581 vq
= &vs
->vqs
[VHOST_SCSI_VQ_EVT
].vq
;
1582 mutex_lock(&vq
->mutex
);
1583 tcm_vhost_send_evt(vs
, tpg
, lun
,
1584 VIRTIO_SCSI_T_TRANSPORT_RESET
, reason
);
1585 mutex_unlock(&vq
->mutex
);
1586 mutex_unlock(&vs
->dev
.mutex
);
1589 static void tcm_vhost_hotplug(struct tcm_vhost_tpg
*tpg
, struct se_lun
*lun
)
1591 tcm_vhost_do_plug(tpg
, lun
, true);
1594 static void tcm_vhost_hotunplug(struct tcm_vhost_tpg
*tpg
, struct se_lun
*lun
)
1596 tcm_vhost_do_plug(tpg
, lun
, false);
1599 static int tcm_vhost_port_link(struct se_portal_group
*se_tpg
,
1602 struct tcm_vhost_tpg
*tv_tpg
= container_of(se_tpg
,
1603 struct tcm_vhost_tpg
, se_tpg
);
1605 mutex_lock(&tcm_vhost_mutex
);
1607 mutex_lock(&tv_tpg
->tv_tpg_mutex
);
1608 tv_tpg
->tv_tpg_port_count
++;
1609 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1611 tcm_vhost_hotplug(tv_tpg
, lun
);
1613 mutex_unlock(&tcm_vhost_mutex
);
1618 static void tcm_vhost_port_unlink(struct se_portal_group
*se_tpg
,
1621 struct tcm_vhost_tpg
*tv_tpg
= container_of(se_tpg
,
1622 struct tcm_vhost_tpg
, se_tpg
);
1624 mutex_lock(&tcm_vhost_mutex
);
1626 mutex_lock(&tv_tpg
->tv_tpg_mutex
);
1627 tv_tpg
->tv_tpg_port_count
--;
1628 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1630 tcm_vhost_hotunplug(tv_tpg
, lun
);
1632 mutex_unlock(&tcm_vhost_mutex
);
1635 static struct se_node_acl
*tcm_vhost_make_nodeacl(
1636 struct se_portal_group
*se_tpg
,
1637 struct config_group
*group
,
1640 struct se_node_acl
*se_nacl
, *se_nacl_new
;
1641 struct tcm_vhost_nacl
*nacl
;
1645 /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1646 return ERR_PTR(-EINVAL); */
1647 se_nacl_new
= tcm_vhost_alloc_fabric_acl(se_tpg
);
1649 return ERR_PTR(-ENOMEM
);
1653 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1654 * when converting a NodeACL from demo mode -> explict
1656 se_nacl
= core_tpg_add_initiator_node_acl(se_tpg
, se_nacl_new
,
1658 if (IS_ERR(se_nacl
)) {
1659 tcm_vhost_release_fabric_acl(se_tpg
, se_nacl_new
);
1663 * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
1665 nacl
= container_of(se_nacl
, struct tcm_vhost_nacl
, se_node_acl
);
1666 nacl
->iport_wwpn
= wwpn
;
1671 static void tcm_vhost_drop_nodeacl(struct se_node_acl
*se_acl
)
1673 struct tcm_vhost_nacl
*nacl
= container_of(se_acl
,
1674 struct tcm_vhost_nacl
, se_node_acl
);
1675 core_tpg_del_initiator_node_acl(se_acl
->se_tpg
, se_acl
, 1);
1679 static int tcm_vhost_make_nexus(struct tcm_vhost_tpg
*tv_tpg
,
1682 struct se_portal_group
*se_tpg
;
1683 struct tcm_vhost_nexus
*tv_nexus
;
1685 mutex_lock(&tv_tpg
->tv_tpg_mutex
);
1686 if (tv_tpg
->tpg_nexus
) {
1687 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1688 pr_debug("tv_tpg->tpg_nexus already exists\n");
1691 se_tpg
= &tv_tpg
->se_tpg
;
1693 tv_nexus
= kzalloc(sizeof(struct tcm_vhost_nexus
), GFP_KERNEL
);
1695 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1696 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1700 * Initialize the struct se_session pointer
1702 tv_nexus
->tvn_se_sess
= transport_init_session();
1703 if (IS_ERR(tv_nexus
->tvn_se_sess
)) {
1704 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1709 * Since we are running in 'demo mode' this call with generate a
1710 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1711 * the SCSI Initiator port name of the passed configfs group 'name'.
1713 tv_nexus
->tvn_se_sess
->se_node_acl
= core_tpg_check_initiator_node_acl(
1714 se_tpg
, (unsigned char *)name
);
1715 if (!tv_nexus
->tvn_se_sess
->se_node_acl
) {
1716 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1717 pr_debug("core_tpg_check_initiator_node_acl() failed"
1719 transport_free_session(tv_nexus
->tvn_se_sess
);
1724 * Now register the TCM vhost virtual I_T Nexus as active with the
1725 * call to __transport_register_session()
1727 __transport_register_session(se_tpg
, tv_nexus
->tvn_se_sess
->se_node_acl
,
1728 tv_nexus
->tvn_se_sess
, tv_nexus
);
1729 tv_tpg
->tpg_nexus
= tv_nexus
;
1731 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1735 static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg
*tpg
)
1737 struct se_session
*se_sess
;
1738 struct tcm_vhost_nexus
*tv_nexus
;
1740 mutex_lock(&tpg
->tv_tpg_mutex
);
1741 tv_nexus
= tpg
->tpg_nexus
;
1743 mutex_unlock(&tpg
->tv_tpg_mutex
);
1747 se_sess
= tv_nexus
->tvn_se_sess
;
1749 mutex_unlock(&tpg
->tv_tpg_mutex
);
1753 if (tpg
->tv_tpg_port_count
!= 0) {
1754 mutex_unlock(&tpg
->tv_tpg_mutex
);
1755 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1756 " active TPG port count: %d\n",
1757 tpg
->tv_tpg_port_count
);
1761 if (tpg
->tv_tpg_vhost_count
!= 0) {
1762 mutex_unlock(&tpg
->tv_tpg_mutex
);
1763 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1764 " active TPG vhost count: %d\n",
1765 tpg
->tv_tpg_vhost_count
);
1769 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
1770 " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg
->tport
),
1771 tv_nexus
->tvn_se_sess
->se_node_acl
->initiatorname
);
1773 * Release the SCSI I_T Nexus to the emulated vhost Target Port
1775 transport_deregister_session(tv_nexus
->tvn_se_sess
);
1776 tpg
->tpg_nexus
= NULL
;
1777 mutex_unlock(&tpg
->tv_tpg_mutex
);
1783 static ssize_t
tcm_vhost_tpg_show_nexus(struct se_portal_group
*se_tpg
,
1786 struct tcm_vhost_tpg
*tv_tpg
= container_of(se_tpg
,
1787 struct tcm_vhost_tpg
, se_tpg
);
1788 struct tcm_vhost_nexus
*tv_nexus
;
1791 mutex_lock(&tv_tpg
->tv_tpg_mutex
);
1792 tv_nexus
= tv_tpg
->tpg_nexus
;
1794 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1797 ret
= snprintf(page
, PAGE_SIZE
, "%s\n",
1798 tv_nexus
->tvn_se_sess
->se_node_acl
->initiatorname
);
1799 mutex_unlock(&tv_tpg
->tv_tpg_mutex
);
1804 static ssize_t
tcm_vhost_tpg_store_nexus(struct se_portal_group
*se_tpg
,
1808 struct tcm_vhost_tpg
*tv_tpg
= container_of(se_tpg
,
1809 struct tcm_vhost_tpg
, se_tpg
);
1810 struct tcm_vhost_tport
*tport_wwn
= tv_tpg
->tport
;
1811 unsigned char i_port
[TCM_VHOST_NAMELEN
], *ptr
, *port_ptr
;
1814 * Shutdown the active I_T nexus if 'NULL' is passed..
1816 if (!strncmp(page
, "NULL", 4)) {
1817 ret
= tcm_vhost_drop_nexus(tv_tpg
);
1818 return (!ret
) ? count
: ret
;
1821 * Otherwise make sure the passed virtual Initiator port WWN matches
1822 * the fabric protocol_id set in tcm_vhost_make_tport(), and call
1823 * tcm_vhost_make_nexus().
1825 if (strlen(page
) >= TCM_VHOST_NAMELEN
) {
1826 pr_err("Emulated NAA Sas Address: %s, exceeds"
1827 " max: %d\n", page
, TCM_VHOST_NAMELEN
);
1830 snprintf(&i_port
[0], TCM_VHOST_NAMELEN
, "%s", page
);
1832 ptr
= strstr(i_port
, "naa.");
1834 if (tport_wwn
->tport_proto_id
!= SCSI_PROTOCOL_SAS
) {
1835 pr_err("Passed SAS Initiator Port %s does not"
1836 " match target port protoid: %s\n", i_port
,
1837 tcm_vhost_dump_proto_id(tport_wwn
));
1840 port_ptr
= &i_port
[0];
1843 ptr
= strstr(i_port
, "fc.");
1845 if (tport_wwn
->tport_proto_id
!= SCSI_PROTOCOL_FCP
) {
1846 pr_err("Passed FCP Initiator Port %s does not"
1847 " match target port protoid: %s\n", i_port
,
1848 tcm_vhost_dump_proto_id(tport_wwn
));
1851 port_ptr
= &i_port
[3]; /* Skip over "fc." */
1854 ptr
= strstr(i_port
, "iqn.");
1856 if (tport_wwn
->tport_proto_id
!= SCSI_PROTOCOL_ISCSI
) {
1857 pr_err("Passed iSCSI Initiator Port %s does not"
1858 " match target port protoid: %s\n", i_port
,
1859 tcm_vhost_dump_proto_id(tport_wwn
));
1862 port_ptr
= &i_port
[0];
1865 pr_err("Unable to locate prefix for emulated Initiator Port:"
1869 * Clear any trailing newline for the NAA WWN
1872 if (i_port
[strlen(i_port
)-1] == '\n')
1873 i_port
[strlen(i_port
)-1] = '\0';
1875 ret
= tcm_vhost_make_nexus(tv_tpg
, port_ptr
);
1882 TF_TPG_BASE_ATTR(tcm_vhost
, nexus
, S_IRUGO
| S_IWUSR
);
1884 static struct configfs_attribute
*tcm_vhost_tpg_attrs
[] = {
1885 &tcm_vhost_tpg_nexus
.attr
,
1889 static struct se_portal_group
*tcm_vhost_make_tpg(struct se_wwn
*wwn
,
1890 struct config_group
*group
,
1893 struct tcm_vhost_tport
*tport
= container_of(wwn
,
1894 struct tcm_vhost_tport
, tport_wwn
);
1896 struct tcm_vhost_tpg
*tpg
;
1900 if (strstr(name
, "tpgt_") != name
)
1901 return ERR_PTR(-EINVAL
);
1902 if (kstrtou16(name
+ 5, 10, &tpgt
) || tpgt
>= VHOST_SCSI_MAX_TARGET
)
1903 return ERR_PTR(-EINVAL
);
1905 tpg
= kzalloc(sizeof(struct tcm_vhost_tpg
), GFP_KERNEL
);
1907 pr_err("Unable to allocate struct tcm_vhost_tpg");
1908 return ERR_PTR(-ENOMEM
);
1910 mutex_init(&tpg
->tv_tpg_mutex
);
1911 INIT_LIST_HEAD(&tpg
->tv_tpg_list
);
1913 tpg
->tport_tpgt
= tpgt
;
1915 ret
= core_tpg_register(&tcm_vhost_fabric_configfs
->tf_ops
, wwn
,
1916 &tpg
->se_tpg
, tpg
, TRANSPORT_TPG_TYPE_NORMAL
);
1921 mutex_lock(&tcm_vhost_mutex
);
1922 list_add_tail(&tpg
->tv_tpg_list
, &tcm_vhost_list
);
1923 mutex_unlock(&tcm_vhost_mutex
);
1925 return &tpg
->se_tpg
;
1928 static void tcm_vhost_drop_tpg(struct se_portal_group
*se_tpg
)
1930 struct tcm_vhost_tpg
*tpg
= container_of(se_tpg
,
1931 struct tcm_vhost_tpg
, se_tpg
);
1933 mutex_lock(&tcm_vhost_mutex
);
1934 list_del(&tpg
->tv_tpg_list
);
1935 mutex_unlock(&tcm_vhost_mutex
);
1937 * Release the virtual I_T Nexus for this vhost TPG
1939 tcm_vhost_drop_nexus(tpg
);
1941 * Deregister the se_tpg from TCM..
1943 core_tpg_deregister(se_tpg
);
1947 static struct se_wwn
*tcm_vhost_make_tport(struct target_fabric_configfs
*tf
,
1948 struct config_group
*group
,
1951 struct tcm_vhost_tport
*tport
;
1956 /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1957 return ERR_PTR(-EINVAL); */
1959 tport
= kzalloc(sizeof(struct tcm_vhost_tport
), GFP_KERNEL
);
1961 pr_err("Unable to allocate struct tcm_vhost_tport");
1962 return ERR_PTR(-ENOMEM
);
1964 tport
->tport_wwpn
= wwpn
;
1966 * Determine the emulated Protocol Identifier and Target Port Name
1967 * based on the incoming configfs directory name.
1969 ptr
= strstr(name
, "naa.");
1971 tport
->tport_proto_id
= SCSI_PROTOCOL_SAS
;
1974 ptr
= strstr(name
, "fc.");
1976 tport
->tport_proto_id
= SCSI_PROTOCOL_FCP
;
1977 off
= 3; /* Skip over "fc." */
1980 ptr
= strstr(name
, "iqn.");
1982 tport
->tport_proto_id
= SCSI_PROTOCOL_ISCSI
;
1986 pr_err("Unable to locate prefix for emulated Target Port:"
1989 return ERR_PTR(-EINVAL
);
1992 if (strlen(name
) >= TCM_VHOST_NAMELEN
) {
1993 pr_err("Emulated %s Address: %s, exceeds"
1994 " max: %d\n", name
, tcm_vhost_dump_proto_id(tport
),
1997 return ERR_PTR(-EINVAL
);
1999 snprintf(&tport
->tport_name
[0], TCM_VHOST_NAMELEN
, "%s", &name
[off
]);
2001 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2002 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport
), name
);
2004 return &tport
->tport_wwn
;
2007 static void tcm_vhost_drop_tport(struct se_wwn
*wwn
)
2009 struct tcm_vhost_tport
*tport
= container_of(wwn
,
2010 struct tcm_vhost_tport
, tport_wwn
);
2012 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2013 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport
),
2019 static ssize_t
tcm_vhost_wwn_show_attr_version(
2020 struct target_fabric_configfs
*tf
,
2023 return sprintf(page
, "TCM_VHOST fabric module %s on %s/%s"
2024 "on "UTS_RELEASE
"\n", TCM_VHOST_VERSION
, utsname()->sysname
,
2025 utsname()->machine
);
2028 TF_WWN_ATTR_RO(tcm_vhost
, version
);
2030 static struct configfs_attribute
*tcm_vhost_wwn_attrs
[] = {
2031 &tcm_vhost_wwn_version
.attr
,
2035 static struct target_core_fabric_ops tcm_vhost_ops
= {
2036 .get_fabric_name
= tcm_vhost_get_fabric_name
,
2037 .get_fabric_proto_ident
= tcm_vhost_get_fabric_proto_ident
,
2038 .tpg_get_wwn
= tcm_vhost_get_fabric_wwn
,
2039 .tpg_get_tag
= tcm_vhost_get_tag
,
2040 .tpg_get_default_depth
= tcm_vhost_get_default_depth
,
2041 .tpg_get_pr_transport_id
= tcm_vhost_get_pr_transport_id
,
2042 .tpg_get_pr_transport_id_len
= tcm_vhost_get_pr_transport_id_len
,
2043 .tpg_parse_pr_out_transport_id
= tcm_vhost_parse_pr_out_transport_id
,
2044 .tpg_check_demo_mode
= tcm_vhost_check_true
,
2045 .tpg_check_demo_mode_cache
= tcm_vhost_check_true
,
2046 .tpg_check_demo_mode_write_protect
= tcm_vhost_check_false
,
2047 .tpg_check_prod_mode_write_protect
= tcm_vhost_check_false
,
2048 .tpg_alloc_fabric_acl
= tcm_vhost_alloc_fabric_acl
,
2049 .tpg_release_fabric_acl
= tcm_vhost_release_fabric_acl
,
2050 .tpg_get_inst_index
= tcm_vhost_tpg_get_inst_index
,
2051 .release_cmd
= tcm_vhost_release_cmd
,
2052 .shutdown_session
= tcm_vhost_shutdown_session
,
2053 .close_session
= tcm_vhost_close_session
,
2054 .sess_get_index
= tcm_vhost_sess_get_index
,
2055 .sess_get_initiator_sid
= NULL
,
2056 .write_pending
= tcm_vhost_write_pending
,
2057 .write_pending_status
= tcm_vhost_write_pending_status
,
2058 .set_default_node_attributes
= tcm_vhost_set_default_node_attrs
,
2059 .get_task_tag
= tcm_vhost_get_task_tag
,
2060 .get_cmd_state
= tcm_vhost_get_cmd_state
,
2061 .queue_data_in
= tcm_vhost_queue_data_in
,
2062 .queue_status
= tcm_vhost_queue_status
,
2063 .queue_tm_rsp
= tcm_vhost_queue_tm_rsp
,
2065 * Setup callers for generic logic in target_core_fabric_configfs.c
2067 .fabric_make_wwn
= tcm_vhost_make_tport
,
2068 .fabric_drop_wwn
= tcm_vhost_drop_tport
,
2069 .fabric_make_tpg
= tcm_vhost_make_tpg
,
2070 .fabric_drop_tpg
= tcm_vhost_drop_tpg
,
2071 .fabric_post_link
= tcm_vhost_port_link
,
2072 .fabric_pre_unlink
= tcm_vhost_port_unlink
,
2073 .fabric_make_np
= NULL
,
2074 .fabric_drop_np
= NULL
,
2075 .fabric_make_nodeacl
= tcm_vhost_make_nodeacl
,
2076 .fabric_drop_nodeacl
= tcm_vhost_drop_nodeacl
,
2079 static int tcm_vhost_register_configfs(void)
2081 struct target_fabric_configfs
*fabric
;
2084 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2085 " on "UTS_RELEASE
"\n", TCM_VHOST_VERSION
, utsname()->sysname
,
2086 utsname()->machine
);
2088 * Register the top level struct config_item_type with TCM core
2090 fabric
= target_fabric_configfs_init(THIS_MODULE
, "vhost");
2091 if (IS_ERR(fabric
)) {
2092 pr_err("target_fabric_configfs_init() failed\n");
2093 return PTR_ERR(fabric
);
2096 * Setup fabric->tf_ops from our local tcm_vhost_ops
2098 fabric
->tf_ops
= tcm_vhost_ops
;
2100 * Setup default attribute lists for various fabric->tf_cit_tmpl
2102 TF_CIT_TMPL(fabric
)->tfc_wwn_cit
.ct_attrs
= tcm_vhost_wwn_attrs
;
2103 TF_CIT_TMPL(fabric
)->tfc_tpg_base_cit
.ct_attrs
= tcm_vhost_tpg_attrs
;
2104 TF_CIT_TMPL(fabric
)->tfc_tpg_attrib_cit
.ct_attrs
= NULL
;
2105 TF_CIT_TMPL(fabric
)->tfc_tpg_param_cit
.ct_attrs
= NULL
;
2106 TF_CIT_TMPL(fabric
)->tfc_tpg_np_base_cit
.ct_attrs
= NULL
;
2107 TF_CIT_TMPL(fabric
)->tfc_tpg_nacl_base_cit
.ct_attrs
= NULL
;
2108 TF_CIT_TMPL(fabric
)->tfc_tpg_nacl_attrib_cit
.ct_attrs
= NULL
;
2109 TF_CIT_TMPL(fabric
)->tfc_tpg_nacl_auth_cit
.ct_attrs
= NULL
;
2110 TF_CIT_TMPL(fabric
)->tfc_tpg_nacl_param_cit
.ct_attrs
= NULL
;
2112 * Register the fabric for use within TCM
2114 ret
= target_fabric_configfs_register(fabric
);
2116 pr_err("target_fabric_configfs_register() failed"
2117 " for TCM_VHOST\n");
2121 * Setup our local pointer to *fabric
2123 tcm_vhost_fabric_configfs
= fabric
;
2124 pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
2128 static void tcm_vhost_deregister_configfs(void)
2130 if (!tcm_vhost_fabric_configfs
)
2133 target_fabric_configfs_deregister(tcm_vhost_fabric_configfs
);
2134 tcm_vhost_fabric_configfs
= NULL
;
2135 pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
2138 static int __init
tcm_vhost_init(void)
2142 * Use our own dedicated workqueue for submitting I/O into
2143 * target core to avoid contention within system_wq.
2145 tcm_vhost_workqueue
= alloc_workqueue("tcm_vhost", 0, 0);
2146 if (!tcm_vhost_workqueue
)
2149 ret
= vhost_scsi_register();
2151 goto out_destroy_workqueue
;
2153 ret
= tcm_vhost_register_configfs();
2155 goto out_vhost_scsi_deregister
;
2159 out_vhost_scsi_deregister
:
2160 vhost_scsi_deregister();
2161 out_destroy_workqueue
:
2162 destroy_workqueue(tcm_vhost_workqueue
);
2167 static void tcm_vhost_exit(void)
2169 tcm_vhost_deregister_configfs();
2170 vhost_scsi_deregister();
2171 destroy_workqueue(tcm_vhost_workqueue
);
2174 MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2175 MODULE_ALIAS("tcm_vhost");
2176 MODULE_LICENSE("GPL");
2177 module_init(tcm_vhost_init
);
2178 module_exit(tcm_vhost_exit
);