1 /*******************************************************************************
2 * Vhost kernel TCM fabric driver for virtio SCSI initiators
4 * (C) Copyright 2010-2013 Datera, Inc.
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@daterainc.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/vmalloc.h>
39 #include <linux/miscdevice.h>
40 #include <asm/unaligned.h>
41 #include <scsi/scsi_common.h>
42 #include <scsi/scsi_proto.h>
43 #include <target/target_core_base.h>
44 #include <target/target_core_fabric.h>
45 #include <target/target_core_fabric_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>
51 #include <linux/percpu_ida.h>
55 #define VHOST_SCSI_VERSION "v0.1"
56 #define VHOST_SCSI_NAMELEN 256
57 #define VHOST_SCSI_MAX_CDB_SIZE 32
58 #define VHOST_SCSI_DEFAULT_TAGS 256
59 #define VHOST_SCSI_PREALLOC_SGLS 2048
60 #define VHOST_SCSI_PREALLOC_UPAGES 2048
61 #define VHOST_SCSI_PREALLOC_PROT_SGLS 512
63 struct vhost_scsi_inflight {
64 /* Wait for the flush operation to finish */
65 struct completion comp;
66 /* Refcount for the inflight reqs */
70 struct vhost_scsi_cmd {
71 /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
73 /* virtio-scsi initiator task attribute */
75 /* virtio-scsi response incoming iovecs */
77 /* virtio-scsi initiator data direction */
78 enum dma_data_direction tvc_data_direction;
79 /* Expected data transfer length from virtio-scsi header */
81 /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
83 /* The number of scatterlists associated with this cmd */
85 u32 tvc_prot_sgl_count;
86 /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */
88 /* Pointer to the SGL formatted memory from virtio-scsi */
89 struct scatterlist *tvc_sgl;
90 struct scatterlist *tvc_prot_sgl;
91 struct page **tvc_upages;
92 /* Pointer to response header iovec */
93 struct iovec *tvc_resp_iov;
94 /* Pointer to vhost_scsi for our device */
95 struct vhost_scsi *tvc_vhost;
96 /* Pointer to vhost_virtqueue for the cmd */
97 struct vhost_virtqueue *tvc_vq;
98 /* Pointer to vhost nexus memory */
99 struct vhost_scsi_nexus *tvc_nexus;
100 /* The TCM I/O descriptor that is accessed via container_of() */
101 struct se_cmd tvc_se_cmd;
102 /* work item used for cmwq dispatch to vhost_scsi_submission_work() */
103 struct work_struct work;
104 /* Copy of the incoming SCSI command descriptor block (CDB) */
105 unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE];
106 /* Sense buffer that will be mapped into outgoing status */
107 unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
108 /* Completed commands list, serviced from vhost worker thread */
109 struct llist_node tvc_completion_list;
110 /* Used to track inflight cmd */
111 struct vhost_scsi_inflight *inflight;
114 struct vhost_scsi_nexus {
115 /* Pointer to TCM session for I_T Nexus */
116 struct se_session *tvn_se_sess;
119 struct vhost_scsi_tpg {
120 /* Vhost port target portal group tag for TCM */
122 /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
123 int tv_tpg_port_count;
124 /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
125 int tv_tpg_vhost_count;
126 /* Used for enabling T10-PI with legacy devices */
127 int tv_fabric_prot_type;
128 /* list for vhost_scsi_list */
129 struct list_head tv_tpg_list;
130 /* Used to protect access for tpg_nexus */
131 struct mutex tv_tpg_mutex;
132 /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
133 struct vhost_scsi_nexus *tpg_nexus;
134 /* Pointer back to vhost_scsi_tport */
135 struct vhost_scsi_tport *tport;
136 /* Returned by vhost_scsi_make_tpg() */
137 struct se_portal_group se_tpg;
138 /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
139 struct vhost_scsi *vhost_scsi;
142 struct vhost_scsi_tport {
143 /* SCSI protocol the tport is providing */
145 /* Binary World Wide unique Port Name for Vhost Target port */
147 /* ASCII formatted WWPN for Vhost Target port */
148 char tport_name[VHOST_SCSI_NAMELEN];
149 /* Returned by vhost_scsi_make_tport() */
150 struct se_wwn tport_wwn;
153 struct vhost_scsi_evt {
154 /* event to be sent to guest */
155 struct virtio_scsi_event event;
156 /* event list, serviced from vhost worker thread */
157 struct llist_node list;
161 VHOST_SCSI_VQ_CTL = 0,
162 VHOST_SCSI_VQ_EVT = 1,
163 VHOST_SCSI_VQ_IO = 2,
166 /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */
168 VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
169 (1ULL << VIRTIO_SCSI_F_T10_PI) |
170 (1ULL << VIRTIO_F_ANY_LAYOUT) |
171 (1ULL << VIRTIO_F_VERSION_1)
174 #define VHOST_SCSI_MAX_TARGET 256
175 #define VHOST_SCSI_MAX_VQ 128
176 #define VHOST_SCSI_MAX_EVENT 128
178 struct vhost_scsi_virtqueue {
179 struct vhost_virtqueue vq;
181 * Reference counting for inflight reqs, used for flush operation. At
182 * each time, one reference tracks new commands submitted, while we
183 * wait for another one to reach 0.
185 struct vhost_scsi_inflight inflights[2];
187 * Indicate current inflight in use, protected by vq->mutex.
188 * Writers must also take dev mutex and flush under it.
194 /* Protected by vhost_scsi->dev.mutex */
195 struct vhost_scsi_tpg **vs_tpg;
196 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
198 struct vhost_dev dev;
199 struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
201 struct vhost_work vs_completion_work; /* cmd completion work item */
202 struct llist_head vs_completion_list; /* cmd completion queue */
204 struct vhost_work vs_event_work; /* evt injection work item */
205 struct llist_head vs_event_list; /* evt injection queue */
207 bool vs_events_missed; /* any missed events, protected by vq->mutex */
208 int vs_events_nr; /* num of pending events, protected by vq->mutex */
211 static struct workqueue_struct *vhost_scsi_workqueue;
213 /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */
214 static DEFINE_MUTEX(vhost_scsi_mutex);
215 static LIST_HEAD(vhost_scsi_list);
217 static int iov_num_pages(void __user *iov_base, size_t iov_len)
219 return (PAGE_ALIGN((unsigned long)iov_base + iov_len) -
220 ((unsigned long)iov_base & PAGE_MASK)) >> PAGE_SHIFT;
223 static void vhost_scsi_done_inflight(struct kref *kref)
225 struct vhost_scsi_inflight *inflight;
227 inflight = container_of(kref, struct vhost_scsi_inflight, kref);
228 complete(&inflight->comp);
231 static void vhost_scsi_init_inflight(struct vhost_scsi *vs,
232 struct vhost_scsi_inflight *old_inflight[])
234 struct vhost_scsi_inflight *new_inflight;
235 struct vhost_virtqueue *vq;
238 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
241 mutex_lock(&vq->mutex);
243 /* store old infight */
244 idx = vs->vqs[i].inflight_idx;
246 old_inflight[i] = &vs->vqs[i].inflights[idx];
248 /* setup new infight */
249 vs->vqs[i].inflight_idx = idx ^ 1;
250 new_inflight = &vs->vqs[i].inflights[idx ^ 1];
251 kref_init(&new_inflight->kref);
252 init_completion(&new_inflight->comp);
254 mutex_unlock(&vq->mutex);
258 static struct vhost_scsi_inflight *
259 vhost_scsi_get_inflight(struct vhost_virtqueue *vq)
261 struct vhost_scsi_inflight *inflight;
262 struct vhost_scsi_virtqueue *svq;
264 svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
265 inflight = &svq->inflights[svq->inflight_idx];
266 kref_get(&inflight->kref);
271 static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight)
273 kref_put(&inflight->kref, vhost_scsi_done_inflight);
276 static int vhost_scsi_check_true(struct se_portal_group *se_tpg)
281 static int vhost_scsi_check_false(struct se_portal_group *se_tpg)
286 static char *vhost_scsi_get_fabric_name(void)
291 static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg)
293 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
294 struct vhost_scsi_tpg, se_tpg);
295 struct vhost_scsi_tport *tport = tpg->tport;
297 return &tport->tport_name[0];
300 static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg)
302 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
303 struct vhost_scsi_tpg, se_tpg);
304 return tpg->tport_tpgt;
307 static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg)
309 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
310 struct vhost_scsi_tpg, se_tpg);
312 return tpg->tv_fabric_prot_type;
315 static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg)
320 static void vhost_scsi_release_cmd(struct se_cmd *se_cmd)
322 struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd,
323 struct vhost_scsi_cmd, tvc_se_cmd);
324 struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess;
327 if (tv_cmd->tvc_sgl_count) {
328 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
329 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
331 if (tv_cmd->tvc_prot_sgl_count) {
332 for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
333 put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
336 vhost_scsi_put_inflight(tv_cmd->inflight);
337 percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
340 static int vhost_scsi_shutdown_session(struct se_session *se_sess)
345 static void vhost_scsi_close_session(struct se_session *se_sess)
350 static u32 vhost_scsi_sess_get_index(struct se_session *se_sess)
355 static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
357 /* Go ahead and process the write immediately */
358 target_execute_cmd(se_cmd);
362 static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd)
367 static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl)
372 static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd)
377 static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd)
379 struct vhost_scsi *vs = cmd->tvc_vhost;
381 llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
383 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
386 static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd)
388 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
389 struct vhost_scsi_cmd, tvc_se_cmd);
390 vhost_scsi_complete_cmd(cmd);
394 static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
396 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
397 struct vhost_scsi_cmd, tvc_se_cmd);
398 vhost_scsi_complete_cmd(cmd);
402 static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
407 static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
412 static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
418 static struct vhost_scsi_evt *
419 vhost_scsi_allocate_evt(struct vhost_scsi *vs,
420 u32 event, u32 reason)
422 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
423 struct vhost_scsi_evt *evt;
425 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
426 vs->vs_events_missed = true;
430 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
432 vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
433 vs->vs_events_missed = true;
437 evt->event.event = cpu_to_vhost32(vq, event);
438 evt->event.reason = cpu_to_vhost32(vq, reason);
444 static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd)
446 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
448 /* TODO locking against target/backend threads? */
449 transport_generic_free_cmd(se_cmd, 0);
453 static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
455 return target_put_sess_cmd(se_cmd);
459 vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
461 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
462 struct virtio_scsi_event *event = &evt->event;
463 struct virtio_scsi_event __user *eventp;
467 if (!vq->private_data) {
468 vs->vs_events_missed = true;
473 vhost_disable_notify(&vs->dev, vq);
474 head = vhost_get_vq_desc(vq, vq->iov,
475 ARRAY_SIZE(vq->iov), &out, &in,
478 vs->vs_events_missed = true;
481 if (head == vq->num) {
482 if (vhost_enable_notify(&vs->dev, vq))
484 vs->vs_events_missed = true;
488 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
489 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
490 vq->iov[out].iov_len);
491 vs->vs_events_missed = true;
495 if (vs->vs_events_missed) {
496 event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
497 vs->vs_events_missed = false;
500 eventp = vq->iov[out].iov_base;
501 ret = __copy_to_user(eventp, event, sizeof(*event));
503 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
505 vq_err(vq, "Faulted on vhost_scsi_send_event\n");
508 static void vhost_scsi_evt_work(struct vhost_work *work)
510 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
512 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
513 struct vhost_scsi_evt *evt;
514 struct llist_node *llnode;
516 mutex_lock(&vq->mutex);
517 llnode = llist_del_all(&vs->vs_event_list);
519 evt = llist_entry(llnode, struct vhost_scsi_evt, list);
520 llnode = llist_next(llnode);
521 vhost_scsi_do_evt_work(vs, evt);
522 vhost_scsi_free_evt(vs, evt);
524 mutex_unlock(&vq->mutex);
527 /* Fill in status and signal that we are done processing this command
529 * This is scheduled in the vhost work queue so we are called with the owner
530 * process mm and can access the vring.
532 static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
534 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
536 DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
537 struct virtio_scsi_cmd_resp v_rsp;
538 struct vhost_scsi_cmd *cmd;
539 struct llist_node *llnode;
540 struct se_cmd *se_cmd;
541 struct iov_iter iov_iter;
544 bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
545 llnode = llist_del_all(&vs->vs_completion_list);
547 cmd = llist_entry(llnode, struct vhost_scsi_cmd,
548 tvc_completion_list);
549 llnode = llist_next(llnode);
550 se_cmd = &cmd->tvc_se_cmd;
552 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
553 cmd, se_cmd->residual_count, se_cmd->scsi_status);
555 memset(&v_rsp, 0, sizeof(v_rsp));
556 v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count);
557 /* TODO is status_qualifier field needed? */
558 v_rsp.status = se_cmd->scsi_status;
559 v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
560 se_cmd->scsi_sense_length);
561 memcpy(v_rsp.sense, cmd->tvc_sense_buf,
562 se_cmd->scsi_sense_length);
564 iov_iter_init(&iov_iter, READ, cmd->tvc_resp_iov,
565 cmd->tvc_in_iovs, sizeof(v_rsp));
566 ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
567 if (likely(ret == sizeof(v_rsp))) {
568 struct vhost_scsi_virtqueue *q;
569 vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
570 q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
572 __set_bit(vq, signal);
574 pr_err("Faulted on virtio_scsi_cmd_resp\n");
576 vhost_scsi_free_cmd(cmd);
580 while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
582 vhost_signal(&vs->dev, &vs->vqs[vq].vq);
585 static struct vhost_scsi_cmd *
586 vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
587 unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
588 u32 exp_data_len, int data_direction)
590 struct vhost_scsi_cmd *cmd;
591 struct vhost_scsi_nexus *tv_nexus;
592 struct se_session *se_sess;
593 struct scatterlist *sg, *prot_sg;
597 tv_nexus = tpg->tpg_nexus;
599 pr_err("Unable to locate active struct vhost_scsi_nexus\n");
600 return ERR_PTR(-EIO);
602 se_sess = tv_nexus->tvn_se_sess;
604 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
606 pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
607 return ERR_PTR(-ENOMEM);
610 cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag];
612 prot_sg = cmd->tvc_prot_sgl;
613 pages = cmd->tvc_upages;
614 memset(cmd, 0, sizeof(struct vhost_scsi_cmd));
617 cmd->tvc_prot_sgl = prot_sg;
618 cmd->tvc_upages = pages;
619 cmd->tvc_se_cmd.map_tag = tag;
620 cmd->tvc_tag = scsi_tag;
622 cmd->tvc_task_attr = task_attr;
623 cmd->tvc_exp_data_len = exp_data_len;
624 cmd->tvc_data_direction = data_direction;
625 cmd->tvc_nexus = tv_nexus;
626 cmd->inflight = vhost_scsi_get_inflight(vq);
628 memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
634 * Map a user memory range into a scatterlist
636 * Returns the number of scatterlist entries used or -errno on error.
639 vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
642 struct scatterlist *sgl,
645 unsigned int npages = 0, offset, nbytes;
646 unsigned int pages_nr = iov_num_pages(ptr, len);
647 struct scatterlist *sg = sgl;
648 struct page **pages = cmd->tvc_upages;
651 if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) {
652 pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
653 " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n",
654 pages_nr, VHOST_SCSI_PREALLOC_UPAGES);
658 ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
659 /* No pages were pinned */
662 /* Less pages pinned than wanted */
663 if (ret != pages_nr) {
664 for (i = 0; i < ret; i++)
671 offset = (uintptr_t)ptr & ~PAGE_MASK;
672 nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
673 sg_set_page(sg, pages[npages], nbytes, offset);
685 vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
689 if (!iter || !iter->iov) {
690 pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
691 " present\n", __func__, bytes);
695 sgl_count = iov_iter_npages(iter, 0xffff);
696 if (sgl_count > max_sgls) {
697 pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
698 " max_sgls: %d\n", __func__, sgl_count, max_sgls);
705 vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write,
706 struct iov_iter *iter,
707 struct scatterlist *sg, int sg_count)
709 size_t off = iter->iov_offset;
712 for (i = 0; i < iter->nr_segs; i++) {
713 void __user *base = iter->iov[i].iov_base + off;
714 size_t len = iter->iov[i].iov_len - off;
716 ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write);
718 for (i = 0; i < sg_count; i++) {
719 struct page *page = sg_page(&sg[i]);
732 vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
733 size_t prot_bytes, struct iov_iter *prot_iter,
734 size_t data_bytes, struct iov_iter *data_iter)
737 bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE);
740 sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
741 VHOST_SCSI_PREALLOC_PROT_SGLS);
745 sg_init_table(cmd->tvc_prot_sgl, sgl_count);
746 cmd->tvc_prot_sgl_count = sgl_count;
747 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
748 cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
750 ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter,
752 cmd->tvc_prot_sgl_count);
754 cmd->tvc_prot_sgl_count = 0;
758 sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
759 VHOST_SCSI_PREALLOC_SGLS);
763 sg_init_table(cmd->tvc_sgl, sgl_count);
764 cmd->tvc_sgl_count = sgl_count;
765 pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
766 cmd->tvc_sgl, cmd->tvc_sgl_count);
768 ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter,
769 cmd->tvc_sgl, cmd->tvc_sgl_count);
771 cmd->tvc_sgl_count = 0;
777 static int vhost_scsi_to_tcm_attr(int attr)
780 case VIRTIO_SCSI_S_SIMPLE:
781 return TCM_SIMPLE_TAG;
782 case VIRTIO_SCSI_S_ORDERED:
783 return TCM_ORDERED_TAG;
784 case VIRTIO_SCSI_S_HEAD:
786 case VIRTIO_SCSI_S_ACA:
791 return TCM_SIMPLE_TAG;
794 static void vhost_scsi_submission_work(struct work_struct *work)
796 struct vhost_scsi_cmd *cmd =
797 container_of(work, struct vhost_scsi_cmd, work);
798 struct vhost_scsi_nexus *tv_nexus;
799 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
800 struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
803 /* FIXME: BIDI operation */
804 if (cmd->tvc_sgl_count) {
805 sg_ptr = cmd->tvc_sgl;
807 if (cmd->tvc_prot_sgl_count)
808 sg_prot_ptr = cmd->tvc_prot_sgl;
810 se_cmd->prot_pto = true;
814 tv_nexus = cmd->tvc_nexus;
817 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
818 cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
819 cmd->tvc_lun, cmd->tvc_exp_data_len,
820 vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
821 cmd->tvc_data_direction, TARGET_SCF_ACK_KREF,
822 sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
823 cmd->tvc_prot_sgl_count);
825 transport_send_check_condition_and_sense(se_cmd,
826 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
827 transport_generic_free_cmd(se_cmd, 0);
832 vhost_scsi_send_bad_target(struct vhost_scsi *vs,
833 struct vhost_virtqueue *vq,
834 int head, unsigned out)
836 struct virtio_scsi_cmd_resp __user *resp;
837 struct virtio_scsi_cmd_resp rsp;
840 memset(&rsp, 0, sizeof(rsp));
841 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
842 resp = vq->iov[out].iov_base;
843 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
845 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
847 pr_err("Faulted on virtio_scsi_cmd_resp\n");
851 vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
853 struct vhost_scsi_tpg **vs_tpg, *tpg;
854 struct virtio_scsi_cmd_req v_req;
855 struct virtio_scsi_cmd_req_pi v_req_pi;
856 struct vhost_scsi_cmd *cmd;
857 struct iov_iter out_iter, in_iter, prot_iter, data_iter;
859 u32 exp_data_len, data_direction;
861 int head, ret, prot_bytes;
862 size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp);
863 size_t out_size, in_size;
865 u8 *target, *lunp, task_attr;
866 bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
869 mutex_lock(&vq->mutex);
871 * We can handle the vq only after the endpoint is setup by calling the
872 * VHOST_SCSI_SET_ENDPOINT ioctl.
874 vs_tpg = vq->private_data;
878 vhost_disable_notify(&vs->dev, vq);
881 head = vhost_get_vq_desc(vq, vq->iov,
882 ARRAY_SIZE(vq->iov), &out, &in,
884 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
886 /* On error, stop handling until the next kick. */
887 if (unlikely(head < 0))
889 /* Nothing new? Wait for eventfd to tell us they refilled. */
890 if (head == vq->num) {
891 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
892 vhost_disable_notify(&vs->dev, vq);
898 * Check for a sane response buffer so we can report early
899 * errors back to the guest.
901 if (unlikely(vq->iov[out].iov_len < rsp_size)) {
902 vq_err(vq, "Expecting at least virtio_scsi_cmd_resp"
903 " size, got %zu bytes\n", vq->iov[out].iov_len);
907 * Setup pointers and values based upon different virtio-scsi
908 * request header if T10_PI is enabled in KVM guest.
912 req_size = sizeof(v_req_pi);
913 lunp = &v_req_pi.lun[0];
914 target = &v_req_pi.lun[1];
917 req_size = sizeof(v_req);
918 lunp = &v_req.lun[0];
919 target = &v_req.lun[1];
922 * FIXME: Not correct for BIDI operation
924 out_size = iov_length(vq->iov, out);
925 in_size = iov_length(&vq->iov[out], in);
928 * Copy over the virtio-scsi request header, which for a
929 * ANY_LAYOUT enabled guest may span multiple iovecs, or a
930 * single iovec may contain both the header + outgoing
933 * copy_from_iter() will advance out_iter, so that it will
934 * point at the start of the outgoing WRITE payload, if
935 * DMA_TO_DEVICE is set.
937 iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size);
939 ret = copy_from_iter(req, req_size, &out_iter);
940 if (unlikely(ret != req_size)) {
941 vq_err(vq, "Faulted on copy_from_iter\n");
942 vhost_scsi_send_bad_target(vs, vq, head, out);
945 /* virtio-scsi spec requires byte 0 of the lun to be 1 */
946 if (unlikely(*lunp != 1)) {
947 vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp);
948 vhost_scsi_send_bad_target(vs, vq, head, out);
952 tpg = ACCESS_ONCE(vs_tpg[*target]);
953 if (unlikely(!tpg)) {
954 /* Target does not exist, fail the request */
955 vhost_scsi_send_bad_target(vs, vq, head, out);
959 * Determine data_direction by calculating the total outgoing
960 * iovec sizes + incoming iovec sizes vs. virtio-scsi request +
961 * response headers respectively.
963 * For DMA_TO_DEVICE this is out_iter, which is already pointing
964 * to the right place.
966 * For DMA_FROM_DEVICE, the iovec will be just past the end
967 * of the virtio-scsi response header in either the same
968 * or immediately following iovec.
970 * Any associated T10_PI bytes for the outgoing / incoming
971 * payloads are included in calculation of exp_data_len here.
975 if (out_size > req_size) {
976 data_direction = DMA_TO_DEVICE;
977 exp_data_len = out_size - req_size;
978 data_iter = out_iter;
979 } else if (in_size > rsp_size) {
980 data_direction = DMA_FROM_DEVICE;
981 exp_data_len = in_size - rsp_size;
983 iov_iter_init(&in_iter, READ, &vq->iov[out], in,
984 rsp_size + exp_data_len);
985 iov_iter_advance(&in_iter, rsp_size);
988 data_direction = DMA_NONE;
992 * If T10_PI header + payload is present, setup prot_iter values
993 * and recalculate data_iter for vhost_scsi_mapal() mapping to
994 * host scatterlists via get_user_pages_fast().
997 if (v_req_pi.pi_bytesout) {
998 if (data_direction != DMA_TO_DEVICE) {
999 vq_err(vq, "Received non zero pi_bytesout,"
1000 " but wrong data_direction\n");
1001 vhost_scsi_send_bad_target(vs, vq, head, out);
1004 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
1005 } else if (v_req_pi.pi_bytesin) {
1006 if (data_direction != DMA_FROM_DEVICE) {
1007 vq_err(vq, "Received non zero pi_bytesin,"
1008 " but wrong data_direction\n");
1009 vhost_scsi_send_bad_target(vs, vq, head, out);
1012 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
1015 * Set prot_iter to data_iter, and advance past any
1016 * preceeding prot_bytes that may be present.
1018 * Also fix up the exp_data_len to reflect only the
1019 * actual data payload length.
1022 exp_data_len -= prot_bytes;
1023 prot_iter = data_iter;
1024 iov_iter_advance(&data_iter, prot_bytes);
1026 tag = vhost64_to_cpu(vq, v_req_pi.tag);
1027 task_attr = v_req_pi.task_attr;
1028 cdb = &v_req_pi.cdb[0];
1029 lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
1031 tag = vhost64_to_cpu(vq, v_req.tag);
1032 task_attr = v_req.task_attr;
1033 cdb = &v_req.cdb[0];
1034 lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
1037 * Check that the received CDB size does not exceeded our
1038 * hardcoded max for vhost-scsi, then get a pre-allocated
1039 * cmd descriptor for the new virtio-scsi tag.
1041 * TODO what if cdb was too small for varlen cdb header?
1043 if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
1044 vq_err(vq, "Received SCSI CDB with command_size: %d that"
1045 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1046 scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
1047 vhost_scsi_send_bad_target(vs, vq, head, out);
1050 cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
1051 exp_data_len + prot_bytes,
1054 vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
1056 vhost_scsi_send_bad_target(vs, vq, head, out);
1059 cmd->tvc_vhost = vs;
1061 cmd->tvc_resp_iov = &vq->iov[out];
1062 cmd->tvc_in_iovs = in;
1064 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1065 cmd->tvc_cdb[0], cmd->tvc_lun);
1066 pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1067 " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
1069 if (data_direction != DMA_NONE) {
1070 ret = vhost_scsi_mapal(cmd,
1071 prot_bytes, &prot_iter,
1072 exp_data_len, &data_iter);
1073 if (unlikely(ret)) {
1074 vq_err(vq, "Failed to map iov to sgl\n");
1075 vhost_scsi_release_cmd(&cmd->tvc_se_cmd);
1076 vhost_scsi_send_bad_target(vs, vq, head, out);
1081 * Save the descriptor from vhost_get_vq_desc() to be used to
1082 * complete the virtio-scsi request in TCM callback context via
1083 * vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
1085 cmd->tvc_vq_desc = head;
1087 * Dispatch cmd descriptor for cmwq execution in process
1088 * context provided by vhost_scsi_workqueue. This also ensures
1089 * cmd is executed on the same kworker CPU as this vhost
1090 * thread to gain positive L2 cache locality effects.
1092 INIT_WORK(&cmd->work, vhost_scsi_submission_work);
1093 queue_work(vhost_scsi_workqueue, &cmd->work);
1096 mutex_unlock(&vq->mutex);
1099 static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1101 pr_debug("%s: The handling func for control queue.\n", __func__);
1105 vhost_scsi_send_evt(struct vhost_scsi *vs,
1106 struct vhost_scsi_tpg *tpg,
1111 struct vhost_scsi_evt *evt;
1113 evt = vhost_scsi_allocate_evt(vs, event, reason);
1118 /* TODO: share lun setup code with virtio-scsi.ko */
1120 * Note: evt->event is zeroed when we allocate it and
1121 * lun[4-7] need to be zero according to virtio-scsi spec.
1123 evt->event.lun[0] = 0x01;
1124 evt->event.lun[1] = tpg->tport_tpgt;
1125 if (lun->unpacked_lun >= 256)
1126 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1127 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1130 llist_add(&evt->list, &vs->vs_event_list);
1131 vhost_work_queue(&vs->dev, &vs->vs_event_work);
1134 static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1136 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1138 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1140 mutex_lock(&vq->mutex);
1141 if (!vq->private_data)
1144 if (vs->vs_events_missed)
1145 vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
1147 mutex_unlock(&vq->mutex);
1150 static void vhost_scsi_handle_kick(struct vhost_work *work)
1152 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1154 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1156 vhost_scsi_handle_vq(vs, vq);
1159 static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
1161 vhost_poll_flush(&vs->vqs[index].vq.poll);
1164 /* Callers must hold dev mutex */
1165 static void vhost_scsi_flush(struct vhost_scsi *vs)
1167 struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
1170 /* Init new inflight and remember the old inflight */
1171 vhost_scsi_init_inflight(vs, old_inflight);
1174 * The inflight->kref was initialized to 1. We decrement it here to
1175 * indicate the start of the flush operation so that it will reach 0
1176 * when all the reqs are finished.
1178 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1179 kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight);
1181 /* Flush both the vhost poll and vhost work */
1182 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1183 vhost_scsi_flush_vq(vs, i);
1184 vhost_work_flush(&vs->dev, &vs->vs_completion_work);
1185 vhost_work_flush(&vs->dev, &vs->vs_event_work);
1187 /* Wait for all reqs issued before the flush to be finished */
1188 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1189 wait_for_completion(&old_inflight[i]->comp);
1193 * Called from vhost_scsi_ioctl() context to walk the list of available
1194 * vhost_scsi_tpg with an active struct vhost_scsi_nexus
1196 * The lock nesting rule is:
1197 * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
1200 vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1201 struct vhost_scsi_target *t)
1203 struct se_portal_group *se_tpg;
1204 struct vhost_scsi_tport *tv_tport;
1205 struct vhost_scsi_tpg *tpg;
1206 struct vhost_scsi_tpg **vs_tpg;
1207 struct vhost_virtqueue *vq;
1208 int index, ret, i, len;
1211 mutex_lock(&vhost_scsi_mutex);
1212 mutex_lock(&vs->dev.mutex);
1214 /* Verify that ring has been setup correctly. */
1215 for (index = 0; index < vs->dev.nvqs; ++index) {
1216 /* Verify that ring has been setup correctly. */
1217 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1223 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1224 vs_tpg = kzalloc(len, GFP_KERNEL);
1230 memcpy(vs_tpg, vs->vs_tpg, len);
1232 list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
1233 mutex_lock(&tpg->tv_tpg_mutex);
1234 if (!tpg->tpg_nexus) {
1235 mutex_unlock(&tpg->tv_tpg_mutex);
1238 if (tpg->tv_tpg_vhost_count != 0) {
1239 mutex_unlock(&tpg->tv_tpg_mutex);
1242 tv_tport = tpg->tport;
1244 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1245 if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
1247 mutex_unlock(&tpg->tv_tpg_mutex);
1252 * In order to ensure individual vhost-scsi configfs
1253 * groups cannot be removed while in use by vhost ioctl,
1254 * go ahead and take an explicit se_tpg->tpg_group.cg_item
1257 se_tpg = &tpg->se_tpg;
1258 ret = target_depend_item(&se_tpg->tpg_group.cg_item);
1260 pr_warn("configfs_depend_item() failed: %d\n", ret);
1262 mutex_unlock(&tpg->tv_tpg_mutex);
1265 tpg->tv_tpg_vhost_count++;
1266 tpg->vhost_scsi = vs;
1267 vs_tpg[tpg->tport_tpgt] = tpg;
1268 smp_mb__after_atomic();
1271 mutex_unlock(&tpg->tv_tpg_mutex);
1275 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1276 sizeof(vs->vs_vhost_wwpn));
1277 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1278 vq = &vs->vqs[i].vq;
1279 mutex_lock(&vq->mutex);
1280 vq->private_data = vs_tpg;
1281 vhost_init_used(vq);
1282 mutex_unlock(&vq->mutex);
1290 * Act as synchronize_rcu to make sure access to
1291 * old vs->vs_tpg is finished.
1293 vhost_scsi_flush(vs);
1295 vs->vs_tpg = vs_tpg;
1298 mutex_unlock(&vs->dev.mutex);
1299 mutex_unlock(&vhost_scsi_mutex);
1304 vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1305 struct vhost_scsi_target *t)
1307 struct se_portal_group *se_tpg;
1308 struct vhost_scsi_tport *tv_tport;
1309 struct vhost_scsi_tpg *tpg;
1310 struct vhost_virtqueue *vq;
1315 mutex_lock(&vhost_scsi_mutex);
1316 mutex_lock(&vs->dev.mutex);
1317 /* Verify that ring has been setup correctly. */
1318 for (index = 0; index < vs->dev.nvqs; ++index) {
1319 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1330 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1332 tpg = vs->vs_tpg[target];
1336 mutex_lock(&tpg->tv_tpg_mutex);
1337 tv_tport = tpg->tport;
1343 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1344 pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
1345 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1346 tv_tport->tport_name, tpg->tport_tpgt,
1347 t->vhost_wwpn, t->vhost_tpgt);
1351 tpg->tv_tpg_vhost_count--;
1352 tpg->vhost_scsi = NULL;
1353 vs->vs_tpg[target] = NULL;
1355 mutex_unlock(&tpg->tv_tpg_mutex);
1357 * Release se_tpg->tpg_group.cg_item configfs dependency now
1358 * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur.
1360 se_tpg = &tpg->se_tpg;
1361 target_undepend_item(&se_tpg->tpg_group.cg_item);
1364 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1365 vq = &vs->vqs[i].vq;
1366 mutex_lock(&vq->mutex);
1367 vq->private_data = NULL;
1368 mutex_unlock(&vq->mutex);
1372 * Act as synchronize_rcu to make sure access to
1373 * old vs->vs_tpg is finished.
1375 vhost_scsi_flush(vs);
1378 WARN_ON(vs->vs_events_nr);
1379 mutex_unlock(&vs->dev.mutex);
1380 mutex_unlock(&vhost_scsi_mutex);
1384 mutex_unlock(&tpg->tv_tpg_mutex);
1386 mutex_unlock(&vs->dev.mutex);
1387 mutex_unlock(&vhost_scsi_mutex);
1391 static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1393 struct vhost_virtqueue *vq;
1396 if (features & ~VHOST_SCSI_FEATURES)
1399 mutex_lock(&vs->dev.mutex);
1400 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1401 !vhost_log_access_ok(&vs->dev)) {
1402 mutex_unlock(&vs->dev.mutex);
1406 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1407 vq = &vs->vqs[i].vq;
1408 mutex_lock(&vq->mutex);
1409 vq->acked_features = features;
1410 mutex_unlock(&vq->mutex);
1412 mutex_unlock(&vs->dev.mutex);
1416 static int vhost_scsi_open(struct inode *inode, struct file *f)
1418 struct vhost_scsi *vs;
1419 struct vhost_virtqueue **vqs;
1422 vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
1424 vs = vzalloc(sizeof(*vs));
1429 vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
1433 vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
1434 vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
1436 vs->vs_events_nr = 0;
1437 vs->vs_events_missed = false;
1439 vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1440 vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1441 vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1442 vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
1443 for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
1444 vqs[i] = &vs->vqs[i].vq;
1445 vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
1447 vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);
1449 vhost_scsi_init_inflight(vs, NULL);
1451 f->private_data = vs;
1460 static int vhost_scsi_release(struct inode *inode, struct file *f)
1462 struct vhost_scsi *vs = f->private_data;
1463 struct vhost_scsi_target t;
1465 mutex_lock(&vs->dev.mutex);
1466 memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1467 mutex_unlock(&vs->dev.mutex);
1468 vhost_scsi_clear_endpoint(vs, &t);
1469 vhost_dev_stop(&vs->dev);
1470 vhost_dev_cleanup(&vs->dev, false);
1471 /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
1472 vhost_scsi_flush(vs);
1479 vhost_scsi_ioctl(struct file *f,
1483 struct vhost_scsi *vs = f->private_data;
1484 struct vhost_scsi_target backend;
1485 void __user *argp = (void __user *)arg;
1486 u64 __user *featurep = argp;
1487 u32 __user *eventsp = argp;
1490 int r, abi_version = VHOST_SCSI_ABI_VERSION;
1491 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1494 case VHOST_SCSI_SET_ENDPOINT:
1495 if (copy_from_user(&backend, argp, sizeof backend))
1497 if (backend.reserved != 0)
1500 return vhost_scsi_set_endpoint(vs, &backend);
1501 case VHOST_SCSI_CLEAR_ENDPOINT:
1502 if (copy_from_user(&backend, argp, sizeof backend))
1504 if (backend.reserved != 0)
1507 return vhost_scsi_clear_endpoint(vs, &backend);
1508 case VHOST_SCSI_GET_ABI_VERSION:
1509 if (copy_to_user(argp, &abi_version, sizeof abi_version))
1512 case VHOST_SCSI_SET_EVENTS_MISSED:
1513 if (get_user(events_missed, eventsp))
1515 mutex_lock(&vq->mutex);
1516 vs->vs_events_missed = events_missed;
1517 mutex_unlock(&vq->mutex);
1519 case VHOST_SCSI_GET_EVENTS_MISSED:
1520 mutex_lock(&vq->mutex);
1521 events_missed = vs->vs_events_missed;
1522 mutex_unlock(&vq->mutex);
1523 if (put_user(events_missed, eventsp))
1526 case VHOST_GET_FEATURES:
1527 features = VHOST_SCSI_FEATURES;
1528 if (copy_to_user(featurep, &features, sizeof features))
1531 case VHOST_SET_FEATURES:
1532 if (copy_from_user(&features, featurep, sizeof features))
1534 return vhost_scsi_set_features(vs, features);
1536 mutex_lock(&vs->dev.mutex);
1537 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1538 /* TODO: flush backend after dev ioctl. */
1539 if (r == -ENOIOCTLCMD)
1540 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
1541 mutex_unlock(&vs->dev.mutex);
1546 #ifdef CONFIG_COMPAT
1547 static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1550 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1554 static const struct file_operations vhost_scsi_fops = {
1555 .owner = THIS_MODULE,
1556 .release = vhost_scsi_release,
1557 .unlocked_ioctl = vhost_scsi_ioctl,
1558 #ifdef CONFIG_COMPAT
1559 .compat_ioctl = vhost_scsi_compat_ioctl,
1561 .open = vhost_scsi_open,
1562 .llseek = noop_llseek,
1565 static struct miscdevice vhost_scsi_misc = {
1571 static int __init vhost_scsi_register(void)
1573 return misc_register(&vhost_scsi_misc);
1576 static int vhost_scsi_deregister(void)
1578 return misc_deregister(&vhost_scsi_misc);
1581 static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
1583 switch (tport->tport_proto_id) {
1584 case SCSI_PROTOCOL_SAS:
1586 case SCSI_PROTOCOL_FCP:
1588 case SCSI_PROTOCOL_ISCSI:
1598 vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
1599 struct se_lun *lun, bool plug)
1602 struct vhost_scsi *vs = tpg->vhost_scsi;
1603 struct vhost_virtqueue *vq;
1609 mutex_lock(&vs->dev.mutex);
1612 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1614 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1616 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1617 mutex_lock(&vq->mutex);
1618 if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
1619 vhost_scsi_send_evt(vs, tpg, lun,
1620 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
1621 mutex_unlock(&vq->mutex);
1622 mutex_unlock(&vs->dev.mutex);
1625 static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1627 vhost_scsi_do_plug(tpg, lun, true);
1630 static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1632 vhost_scsi_do_plug(tpg, lun, false);
1635 static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
1638 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1639 struct vhost_scsi_tpg, se_tpg);
1641 mutex_lock(&vhost_scsi_mutex);
1643 mutex_lock(&tpg->tv_tpg_mutex);
1644 tpg->tv_tpg_port_count++;
1645 mutex_unlock(&tpg->tv_tpg_mutex);
1647 vhost_scsi_hotplug(tpg, lun);
1649 mutex_unlock(&vhost_scsi_mutex);
1654 static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
1657 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1658 struct vhost_scsi_tpg, se_tpg);
1660 mutex_lock(&vhost_scsi_mutex);
1662 mutex_lock(&tpg->tv_tpg_mutex);
1663 tpg->tv_tpg_port_count--;
1664 mutex_unlock(&tpg->tv_tpg_mutex);
1666 vhost_scsi_hotunplug(tpg, lun);
1668 mutex_unlock(&vhost_scsi_mutex);
1671 static void vhost_scsi_free_cmd_map_res(struct vhost_scsi_nexus *nexus,
1672 struct se_session *se_sess)
1674 struct vhost_scsi_cmd *tv_cmd;
1677 if (!se_sess->sess_cmd_map)
1680 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1681 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1683 kfree(tv_cmd->tvc_sgl);
1684 kfree(tv_cmd->tvc_prot_sgl);
1685 kfree(tv_cmd->tvc_upages);
1689 static ssize_t vhost_scsi_tpg_attrib_store_fabric_prot_type(
1690 struct se_portal_group *se_tpg,
1694 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1695 struct vhost_scsi_tpg, se_tpg);
1697 int ret = kstrtoul(page, 0, &val);
1700 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
1703 if (val != 0 && val != 1 && val != 3) {
1704 pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
1707 tpg->tv_fabric_prot_type = val;
1712 static ssize_t vhost_scsi_tpg_attrib_show_fabric_prot_type(
1713 struct se_portal_group *se_tpg,
1716 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1717 struct vhost_scsi_tpg, se_tpg);
1719 return sprintf(page, "%d\n", tpg->tv_fabric_prot_type);
1721 TF_TPG_ATTRIB_ATTR(vhost_scsi, fabric_prot_type, S_IRUGO | S_IWUSR);
1723 static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
1724 &vhost_scsi_tpg_attrib_fabric_prot_type.attr,
1728 static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
1731 struct se_portal_group *se_tpg;
1732 struct se_session *se_sess;
1733 struct vhost_scsi_nexus *tv_nexus;
1734 struct vhost_scsi_cmd *tv_cmd;
1737 mutex_lock(&tpg->tv_tpg_mutex);
1738 if (tpg->tpg_nexus) {
1739 mutex_unlock(&tpg->tv_tpg_mutex);
1740 pr_debug("tpg->tpg_nexus already exists\n");
1743 se_tpg = &tpg->se_tpg;
1745 tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL);
1747 mutex_unlock(&tpg->tv_tpg_mutex);
1748 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
1752 * Initialize the struct se_session pointer and setup tagpool
1753 * for struct vhost_scsi_cmd descriptors
1755 tv_nexus->tvn_se_sess = transport_init_session_tags(
1756 VHOST_SCSI_DEFAULT_TAGS,
1757 sizeof(struct vhost_scsi_cmd),
1758 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS);
1759 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1760 mutex_unlock(&tpg->tv_tpg_mutex);
1764 se_sess = tv_nexus->tvn_se_sess;
1765 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1766 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1768 tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) *
1769 VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL);
1770 if (!tv_cmd->tvc_sgl) {
1771 mutex_unlock(&tpg->tv_tpg_mutex);
1772 pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1776 tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
1777 VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL);
1778 if (!tv_cmd->tvc_upages) {
1779 mutex_unlock(&tpg->tv_tpg_mutex);
1780 pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1784 tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
1785 VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL);
1786 if (!tv_cmd->tvc_prot_sgl) {
1787 mutex_unlock(&tpg->tv_tpg_mutex);
1788 pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1793 * Since we are running in 'demo mode' this call with generate a
1794 * struct se_node_acl for the vhost_scsi struct se_portal_group with
1795 * the SCSI Initiator port name of the passed configfs group 'name'.
1797 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1798 se_tpg, (unsigned char *)name);
1799 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1800 mutex_unlock(&tpg->tv_tpg_mutex);
1801 pr_debug("core_tpg_check_initiator_node_acl() failed"
1806 * Now register the TCM vhost virtual I_T Nexus as active.
1808 transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1809 tv_nexus->tvn_se_sess, tv_nexus);
1810 tpg->tpg_nexus = tv_nexus;
1812 mutex_unlock(&tpg->tv_tpg_mutex);
1816 vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
1817 transport_free_session(se_sess);
1822 static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
1824 struct se_session *se_sess;
1825 struct vhost_scsi_nexus *tv_nexus;
1827 mutex_lock(&tpg->tv_tpg_mutex);
1828 tv_nexus = tpg->tpg_nexus;
1830 mutex_unlock(&tpg->tv_tpg_mutex);
1834 se_sess = tv_nexus->tvn_se_sess;
1836 mutex_unlock(&tpg->tv_tpg_mutex);
1840 if (tpg->tv_tpg_port_count != 0) {
1841 mutex_unlock(&tpg->tv_tpg_mutex);
1842 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1843 " active TPG port count: %d\n",
1844 tpg->tv_tpg_port_count);
1848 if (tpg->tv_tpg_vhost_count != 0) {
1849 mutex_unlock(&tpg->tv_tpg_mutex);
1850 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1851 " active TPG vhost count: %d\n",
1852 tpg->tv_tpg_vhost_count);
1856 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
1857 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
1858 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1860 vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
1862 * Release the SCSI I_T Nexus to the emulated vhost Target Port
1864 transport_deregister_session(tv_nexus->tvn_se_sess);
1865 tpg->tpg_nexus = NULL;
1866 mutex_unlock(&tpg->tv_tpg_mutex);
1872 static ssize_t vhost_scsi_tpg_show_nexus(struct se_portal_group *se_tpg,
1875 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1876 struct vhost_scsi_tpg, se_tpg);
1877 struct vhost_scsi_nexus *tv_nexus;
1880 mutex_lock(&tpg->tv_tpg_mutex);
1881 tv_nexus = tpg->tpg_nexus;
1883 mutex_unlock(&tpg->tv_tpg_mutex);
1886 ret = snprintf(page, PAGE_SIZE, "%s\n",
1887 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1888 mutex_unlock(&tpg->tv_tpg_mutex);
1893 static ssize_t vhost_scsi_tpg_store_nexus(struct se_portal_group *se_tpg,
1897 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1898 struct vhost_scsi_tpg, se_tpg);
1899 struct vhost_scsi_tport *tport_wwn = tpg->tport;
1900 unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
1903 * Shutdown the active I_T nexus if 'NULL' is passed..
1905 if (!strncmp(page, "NULL", 4)) {
1906 ret = vhost_scsi_drop_nexus(tpg);
1907 return (!ret) ? count : ret;
1910 * Otherwise make sure the passed virtual Initiator port WWN matches
1911 * the fabric protocol_id set in vhost_scsi_make_tport(), and call
1912 * vhost_scsi_make_nexus().
1914 if (strlen(page) >= VHOST_SCSI_NAMELEN) {
1915 pr_err("Emulated NAA Sas Address: %s, exceeds"
1916 " max: %d\n", page, VHOST_SCSI_NAMELEN);
1919 snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
1921 ptr = strstr(i_port, "naa.");
1923 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1924 pr_err("Passed SAS Initiator Port %s does not"
1925 " match target port protoid: %s\n", i_port,
1926 vhost_scsi_dump_proto_id(tport_wwn));
1929 port_ptr = &i_port[0];
1932 ptr = strstr(i_port, "fc.");
1934 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1935 pr_err("Passed FCP Initiator Port %s does not"
1936 " match target port protoid: %s\n", i_port,
1937 vhost_scsi_dump_proto_id(tport_wwn));
1940 port_ptr = &i_port[3]; /* Skip over "fc." */
1943 ptr = strstr(i_port, "iqn.");
1945 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1946 pr_err("Passed iSCSI Initiator Port %s does not"
1947 " match target port protoid: %s\n", i_port,
1948 vhost_scsi_dump_proto_id(tport_wwn));
1951 port_ptr = &i_port[0];
1954 pr_err("Unable to locate prefix for emulated Initiator Port:"
1958 * Clear any trailing newline for the NAA WWN
1961 if (i_port[strlen(i_port)-1] == '\n')
1962 i_port[strlen(i_port)-1] = '\0';
1964 ret = vhost_scsi_make_nexus(tpg, port_ptr);
1971 TF_TPG_BASE_ATTR(vhost_scsi, nexus, S_IRUGO | S_IWUSR);
1973 static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
1974 &vhost_scsi_tpg_nexus.attr,
1978 static struct se_portal_group *
1979 vhost_scsi_make_tpg(struct se_wwn *wwn,
1980 struct config_group *group,
1983 struct vhost_scsi_tport *tport = container_of(wwn,
1984 struct vhost_scsi_tport, tport_wwn);
1986 struct vhost_scsi_tpg *tpg;
1990 if (strstr(name, "tpgt_") != name)
1991 return ERR_PTR(-EINVAL);
1992 if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
1993 return ERR_PTR(-EINVAL);
1995 tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL);
1997 pr_err("Unable to allocate struct vhost_scsi_tpg");
1998 return ERR_PTR(-ENOMEM);
2000 mutex_init(&tpg->tv_tpg_mutex);
2001 INIT_LIST_HEAD(&tpg->tv_tpg_list);
2003 tpg->tport_tpgt = tpgt;
2005 ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id);
2010 mutex_lock(&vhost_scsi_mutex);
2011 list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
2012 mutex_unlock(&vhost_scsi_mutex);
2014 return &tpg->se_tpg;
2017 static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
2019 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2020 struct vhost_scsi_tpg, se_tpg);
2022 mutex_lock(&vhost_scsi_mutex);
2023 list_del(&tpg->tv_tpg_list);
2024 mutex_unlock(&vhost_scsi_mutex);
2026 * Release the virtual I_T Nexus for this vhost TPG
2028 vhost_scsi_drop_nexus(tpg);
2030 * Deregister the se_tpg from TCM..
2032 core_tpg_deregister(se_tpg);
2036 static struct se_wwn *
2037 vhost_scsi_make_tport(struct target_fabric_configfs *tf,
2038 struct config_group *group,
2041 struct vhost_scsi_tport *tport;
2046 /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
2047 return ERR_PTR(-EINVAL); */
2049 tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL);
2051 pr_err("Unable to allocate struct vhost_scsi_tport");
2052 return ERR_PTR(-ENOMEM);
2054 tport->tport_wwpn = wwpn;
2056 * Determine the emulated Protocol Identifier and Target Port Name
2057 * based on the incoming configfs directory name.
2059 ptr = strstr(name, "naa.");
2061 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2064 ptr = strstr(name, "fc.");
2066 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2067 off = 3; /* Skip over "fc." */
2070 ptr = strstr(name, "iqn.");
2072 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2076 pr_err("Unable to locate prefix for emulated Target Port:"
2079 return ERR_PTR(-EINVAL);
2082 if (strlen(name) >= VHOST_SCSI_NAMELEN) {
2083 pr_err("Emulated %s Address: %s, exceeds"
2084 " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2085 VHOST_SCSI_NAMELEN);
2087 return ERR_PTR(-EINVAL);
2089 snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
2091 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2092 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
2094 return &tport->tport_wwn;
2097 static void vhost_scsi_drop_tport(struct se_wwn *wwn)
2099 struct vhost_scsi_tport *tport = container_of(wwn,
2100 struct vhost_scsi_tport, tport_wwn);
2102 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2103 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
2110 vhost_scsi_wwn_show_attr_version(struct target_fabric_configfs *tf,
2113 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
2114 "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2115 utsname()->machine);
2118 TF_WWN_ATTR_RO(vhost_scsi, version);
2120 static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
2121 &vhost_scsi_wwn_version.attr,
2125 static struct target_core_fabric_ops vhost_scsi_ops = {
2126 .module = THIS_MODULE,
2128 .get_fabric_name = vhost_scsi_get_fabric_name,
2129 .tpg_get_wwn = vhost_scsi_get_fabric_wwn,
2130 .tpg_get_tag = vhost_scsi_get_tpgt,
2131 .tpg_check_demo_mode = vhost_scsi_check_true,
2132 .tpg_check_demo_mode_cache = vhost_scsi_check_true,
2133 .tpg_check_demo_mode_write_protect = vhost_scsi_check_false,
2134 .tpg_check_prod_mode_write_protect = vhost_scsi_check_false,
2135 .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only,
2136 .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index,
2137 .release_cmd = vhost_scsi_release_cmd,
2138 .check_stop_free = vhost_scsi_check_stop_free,
2139 .shutdown_session = vhost_scsi_shutdown_session,
2140 .close_session = vhost_scsi_close_session,
2141 .sess_get_index = vhost_scsi_sess_get_index,
2142 .sess_get_initiator_sid = NULL,
2143 .write_pending = vhost_scsi_write_pending,
2144 .write_pending_status = vhost_scsi_write_pending_status,
2145 .set_default_node_attributes = vhost_scsi_set_default_node_attrs,
2146 .get_cmd_state = vhost_scsi_get_cmd_state,
2147 .queue_data_in = vhost_scsi_queue_data_in,
2148 .queue_status = vhost_scsi_queue_status,
2149 .queue_tm_rsp = vhost_scsi_queue_tm_rsp,
2150 .aborted_task = vhost_scsi_aborted_task,
2152 * Setup callers for generic logic in target_core_fabric_configfs.c
2154 .fabric_make_wwn = vhost_scsi_make_tport,
2155 .fabric_drop_wwn = vhost_scsi_drop_tport,
2156 .fabric_make_tpg = vhost_scsi_make_tpg,
2157 .fabric_drop_tpg = vhost_scsi_drop_tpg,
2158 .fabric_post_link = vhost_scsi_port_link,
2159 .fabric_pre_unlink = vhost_scsi_port_unlink,
2161 .tfc_wwn_attrs = vhost_scsi_wwn_attrs,
2162 .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs,
2163 .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs,
2166 static int __init vhost_scsi_init(void)
2170 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2171 " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2172 utsname()->machine);
2175 * Use our own dedicated workqueue for submitting I/O into
2176 * target core to avoid contention within system_wq.
2178 vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
2179 if (!vhost_scsi_workqueue)
2182 ret = vhost_scsi_register();
2184 goto out_destroy_workqueue;
2186 ret = target_register_template(&vhost_scsi_ops);
2188 goto out_vhost_scsi_deregister;
2192 out_vhost_scsi_deregister:
2193 vhost_scsi_deregister();
2194 out_destroy_workqueue:
2195 destroy_workqueue(vhost_scsi_workqueue);
2200 static void vhost_scsi_exit(void)
2202 target_unregister_template(&vhost_scsi_ops);
2203 vhost_scsi_deregister();
2204 destroy_workqueue(vhost_scsi_workqueue);
2207 MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2208 MODULE_ALIAS("tcm_vhost");
2209 MODULE_LICENSE("GPL");
2210 module_init(vhost_scsi_init);
2211 module_exit(vhost_scsi_exit);