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)
172 #define VHOST_SCSI_MAX_TARGET 256
173 #define VHOST_SCSI_MAX_VQ 128
174 #define VHOST_SCSI_MAX_EVENT 128
176 struct vhost_scsi_virtqueue {
177 struct vhost_virtqueue vq;
179 * Reference counting for inflight reqs, used for flush operation. At
180 * each time, one reference tracks new commands submitted, while we
181 * wait for another one to reach 0.
183 struct vhost_scsi_inflight inflights[2];
185 * Indicate current inflight in use, protected by vq->mutex.
186 * Writers must also take dev mutex and flush under it.
192 /* Protected by vhost_scsi->dev.mutex */
193 struct vhost_scsi_tpg **vs_tpg;
194 char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
196 struct vhost_dev dev;
197 struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
199 struct vhost_work vs_completion_work; /* cmd completion work item */
200 struct llist_head vs_completion_list; /* cmd completion queue */
202 struct vhost_work vs_event_work; /* evt injection work item */
203 struct llist_head vs_event_list; /* evt injection queue */
205 bool vs_events_missed; /* any missed events, protected by vq->mutex */
206 int vs_events_nr; /* num of pending events, protected by vq->mutex */
209 static struct workqueue_struct *vhost_scsi_workqueue;
211 /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */
212 static DEFINE_MUTEX(vhost_scsi_mutex);
213 static LIST_HEAD(vhost_scsi_list);
215 static int iov_num_pages(void __user *iov_base, size_t iov_len)
217 return (PAGE_ALIGN((unsigned long)iov_base + iov_len) -
218 ((unsigned long)iov_base & PAGE_MASK)) >> PAGE_SHIFT;
221 static void vhost_scsi_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 vhost_scsi_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 vhost_scsi_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 vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight)
271 kref_put(&inflight->kref, vhost_scsi_done_inflight);
274 static int vhost_scsi_check_true(struct se_portal_group *se_tpg)
279 static int vhost_scsi_check_false(struct se_portal_group *se_tpg)
284 static char *vhost_scsi_get_fabric_name(void)
289 static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg)
291 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
292 struct vhost_scsi_tpg, se_tpg);
293 struct vhost_scsi_tport *tport = tpg->tport;
295 return &tport->tport_name[0];
298 static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg)
300 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
301 struct vhost_scsi_tpg, se_tpg);
302 return tpg->tport_tpgt;
305 static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg)
307 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
308 struct vhost_scsi_tpg, se_tpg);
310 return tpg->tv_fabric_prot_type;
313 static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg)
318 static void vhost_scsi_release_cmd(struct se_cmd *se_cmd)
320 struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd,
321 struct vhost_scsi_cmd, tvc_se_cmd);
322 struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess;
325 if (tv_cmd->tvc_sgl_count) {
326 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
327 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
329 if (tv_cmd->tvc_prot_sgl_count) {
330 for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
331 put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
334 vhost_scsi_put_inflight(tv_cmd->inflight);
335 percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
338 static int vhost_scsi_shutdown_session(struct se_session *se_sess)
343 static void vhost_scsi_close_session(struct se_session *se_sess)
348 static u32 vhost_scsi_sess_get_index(struct se_session *se_sess)
353 static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
355 /* Go ahead and process the write immediately */
356 target_execute_cmd(se_cmd);
360 static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd)
365 static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl)
370 static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd)
375 static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd)
377 struct vhost_scsi *vs = cmd->tvc_vhost;
379 llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
381 vhost_work_queue(&vs->dev, &vs->vs_completion_work);
384 static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd)
386 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
387 struct vhost_scsi_cmd, tvc_se_cmd);
388 vhost_scsi_complete_cmd(cmd);
392 static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
394 struct vhost_scsi_cmd *cmd = container_of(se_cmd,
395 struct vhost_scsi_cmd, tvc_se_cmd);
396 vhost_scsi_complete_cmd(cmd);
400 static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
405 static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
410 static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
416 static struct vhost_scsi_evt *
417 vhost_scsi_allocate_evt(struct vhost_scsi *vs,
418 u32 event, u32 reason)
420 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
421 struct vhost_scsi_evt *evt;
423 if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
424 vs->vs_events_missed = true;
428 evt = kzalloc(sizeof(*evt), GFP_KERNEL);
430 vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
431 vs->vs_events_missed = true;
435 evt->event.event = cpu_to_vhost32(vq, event);
436 evt->event.reason = cpu_to_vhost32(vq, reason);
442 static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd)
444 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
446 /* TODO locking against target/backend threads? */
447 transport_generic_free_cmd(se_cmd, 0);
451 static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
453 return target_put_sess_cmd(se_cmd);
457 vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
459 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
460 struct virtio_scsi_event *event = &evt->event;
461 struct virtio_scsi_event __user *eventp;
465 if (!vq->private_data) {
466 vs->vs_events_missed = true;
471 vhost_disable_notify(&vs->dev, vq);
472 head = vhost_get_vq_desc(vq, vq->iov,
473 ARRAY_SIZE(vq->iov), &out, &in,
476 vs->vs_events_missed = true;
479 if (head == vq->num) {
480 if (vhost_enable_notify(&vs->dev, vq))
482 vs->vs_events_missed = true;
486 if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
487 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
488 vq->iov[out].iov_len);
489 vs->vs_events_missed = true;
493 if (vs->vs_events_missed) {
494 event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
495 vs->vs_events_missed = false;
498 eventp = vq->iov[out].iov_base;
499 ret = __copy_to_user(eventp, event, sizeof(*event));
501 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
503 vq_err(vq, "Faulted on vhost_scsi_send_event\n");
506 static void vhost_scsi_evt_work(struct vhost_work *work)
508 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
510 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
511 struct vhost_scsi_evt *evt;
512 struct llist_node *llnode;
514 mutex_lock(&vq->mutex);
515 llnode = llist_del_all(&vs->vs_event_list);
517 evt = llist_entry(llnode, struct vhost_scsi_evt, list);
518 llnode = llist_next(llnode);
519 vhost_scsi_do_evt_work(vs, evt);
520 vhost_scsi_free_evt(vs, evt);
522 mutex_unlock(&vq->mutex);
525 /* Fill in status and signal that we are done processing this command
527 * This is scheduled in the vhost work queue so we are called with the owner
528 * process mm and can access the vring.
530 static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
532 struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
534 DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
535 struct virtio_scsi_cmd_resp v_rsp;
536 struct vhost_scsi_cmd *cmd;
537 struct llist_node *llnode;
538 struct se_cmd *se_cmd;
539 struct iov_iter iov_iter;
542 bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
543 llnode = llist_del_all(&vs->vs_completion_list);
545 cmd = llist_entry(llnode, struct vhost_scsi_cmd,
546 tvc_completion_list);
547 llnode = llist_next(llnode);
548 se_cmd = &cmd->tvc_se_cmd;
550 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
551 cmd, se_cmd->residual_count, se_cmd->scsi_status);
553 memset(&v_rsp, 0, sizeof(v_rsp));
554 v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count);
555 /* TODO is status_qualifier field needed? */
556 v_rsp.status = se_cmd->scsi_status;
557 v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
558 se_cmd->scsi_sense_length);
559 memcpy(v_rsp.sense, cmd->tvc_sense_buf,
560 se_cmd->scsi_sense_length);
562 iov_iter_init(&iov_iter, READ, cmd->tvc_resp_iov,
563 cmd->tvc_in_iovs, sizeof(v_rsp));
564 ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
565 if (likely(ret == sizeof(v_rsp))) {
566 struct vhost_scsi_virtqueue *q;
567 vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
568 q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
570 __set_bit(vq, signal);
572 pr_err("Faulted on virtio_scsi_cmd_resp\n");
574 vhost_scsi_free_cmd(cmd);
578 while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
580 vhost_signal(&vs->dev, &vs->vqs[vq].vq);
583 static struct vhost_scsi_cmd *
584 vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
585 unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
586 u32 exp_data_len, int data_direction)
588 struct vhost_scsi_cmd *cmd;
589 struct vhost_scsi_nexus *tv_nexus;
590 struct se_session *se_sess;
591 struct scatterlist *sg, *prot_sg;
595 tv_nexus = tpg->tpg_nexus;
597 pr_err("Unable to locate active struct vhost_scsi_nexus\n");
598 return ERR_PTR(-EIO);
600 se_sess = tv_nexus->tvn_se_sess;
602 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
604 pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
605 return ERR_PTR(-ENOMEM);
608 cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag];
610 prot_sg = cmd->tvc_prot_sgl;
611 pages = cmd->tvc_upages;
612 memset(cmd, 0, sizeof(struct vhost_scsi_cmd));
615 cmd->tvc_prot_sgl = prot_sg;
616 cmd->tvc_upages = pages;
617 cmd->tvc_se_cmd.map_tag = tag;
618 cmd->tvc_tag = scsi_tag;
620 cmd->tvc_task_attr = task_attr;
621 cmd->tvc_exp_data_len = exp_data_len;
622 cmd->tvc_data_direction = data_direction;
623 cmd->tvc_nexus = tv_nexus;
624 cmd->inflight = vhost_scsi_get_inflight(vq);
626 memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
632 * Map a user memory range into a scatterlist
634 * Returns the number of scatterlist entries used or -errno on error.
637 vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
640 struct scatterlist *sgl,
643 unsigned int npages = 0, offset, nbytes;
644 unsigned int pages_nr = iov_num_pages(ptr, len);
645 struct scatterlist *sg = sgl;
646 struct page **pages = cmd->tvc_upages;
649 if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) {
650 pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
651 " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n",
652 pages_nr, VHOST_SCSI_PREALLOC_UPAGES);
656 ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
657 /* No pages were pinned */
660 /* Less pages pinned than wanted */
661 if (ret != pages_nr) {
662 for (i = 0; i < ret; i++)
669 offset = (uintptr_t)ptr & ~PAGE_MASK;
670 nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
671 sg_set_page(sg, pages[npages], nbytes, offset);
683 vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
687 if (!iter || !iter->iov) {
688 pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
689 " present\n", __func__, bytes);
693 sgl_count = iov_iter_npages(iter, 0xffff);
694 if (sgl_count > max_sgls) {
695 pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
696 " max_sgls: %d\n", __func__, sgl_count, max_sgls);
703 vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write,
704 struct iov_iter *iter,
705 struct scatterlist *sg, int sg_count)
707 size_t off = iter->iov_offset;
710 for (i = 0; i < iter->nr_segs; i++) {
711 void __user *base = iter->iov[i].iov_base + off;
712 size_t len = iter->iov[i].iov_len - off;
714 ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write);
716 for (i = 0; i < sg_count; i++) {
717 struct page *page = sg_page(&sg[i]);
730 vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
731 size_t prot_bytes, struct iov_iter *prot_iter,
732 size_t data_bytes, struct iov_iter *data_iter)
735 bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE);
738 sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
739 VHOST_SCSI_PREALLOC_PROT_SGLS);
743 sg_init_table(cmd->tvc_prot_sgl, sgl_count);
744 cmd->tvc_prot_sgl_count = sgl_count;
745 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
746 cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
748 ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter,
750 cmd->tvc_prot_sgl_count);
752 cmd->tvc_prot_sgl_count = 0;
756 sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
757 VHOST_SCSI_PREALLOC_SGLS);
761 sg_init_table(cmd->tvc_sgl, sgl_count);
762 cmd->tvc_sgl_count = sgl_count;
763 pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
764 cmd->tvc_sgl, cmd->tvc_sgl_count);
766 ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter,
767 cmd->tvc_sgl, cmd->tvc_sgl_count);
769 cmd->tvc_sgl_count = 0;
775 static int vhost_scsi_to_tcm_attr(int attr)
778 case VIRTIO_SCSI_S_SIMPLE:
779 return TCM_SIMPLE_TAG;
780 case VIRTIO_SCSI_S_ORDERED:
781 return TCM_ORDERED_TAG;
782 case VIRTIO_SCSI_S_HEAD:
784 case VIRTIO_SCSI_S_ACA:
789 return TCM_SIMPLE_TAG;
792 static void vhost_scsi_submission_work(struct work_struct *work)
794 struct vhost_scsi_cmd *cmd =
795 container_of(work, struct vhost_scsi_cmd, work);
796 struct vhost_scsi_nexus *tv_nexus;
797 struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
798 struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
801 /* FIXME: BIDI operation */
802 if (cmd->tvc_sgl_count) {
803 sg_ptr = cmd->tvc_sgl;
805 if (cmd->tvc_prot_sgl_count)
806 sg_prot_ptr = cmd->tvc_prot_sgl;
808 se_cmd->prot_pto = true;
812 tv_nexus = cmd->tvc_nexus;
815 rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
816 cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
817 cmd->tvc_lun, cmd->tvc_exp_data_len,
818 vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
819 cmd->tvc_data_direction, TARGET_SCF_ACK_KREF,
820 sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
821 cmd->tvc_prot_sgl_count);
823 transport_send_check_condition_and_sense(se_cmd,
824 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
825 transport_generic_free_cmd(se_cmd, 0);
830 vhost_scsi_send_bad_target(struct vhost_scsi *vs,
831 struct vhost_virtqueue *vq,
832 int head, unsigned out)
834 struct virtio_scsi_cmd_resp __user *resp;
835 struct virtio_scsi_cmd_resp rsp;
838 memset(&rsp, 0, sizeof(rsp));
839 rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
840 resp = vq->iov[out].iov_base;
841 ret = __copy_to_user(resp, &rsp, sizeof(rsp));
843 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
845 pr_err("Faulted on virtio_scsi_cmd_resp\n");
849 vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
851 struct vhost_scsi_tpg **vs_tpg, *tpg;
852 struct virtio_scsi_cmd_req v_req;
853 struct virtio_scsi_cmd_req_pi v_req_pi;
854 struct vhost_scsi_cmd *cmd;
855 struct iov_iter out_iter, in_iter, prot_iter, data_iter;
857 u32 exp_data_len, data_direction;
859 int head, ret, prot_bytes;
860 size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp);
861 size_t out_size, in_size;
863 u8 *target, *lunp, task_attr;
864 bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
867 mutex_lock(&vq->mutex);
869 * We can handle the vq only after the endpoint is setup by calling the
870 * VHOST_SCSI_SET_ENDPOINT ioctl.
872 vs_tpg = vq->private_data;
876 vhost_disable_notify(&vs->dev, vq);
879 head = vhost_get_vq_desc(vq, vq->iov,
880 ARRAY_SIZE(vq->iov), &out, &in,
882 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
884 /* On error, stop handling until the next kick. */
885 if (unlikely(head < 0))
887 /* Nothing new? Wait for eventfd to tell us they refilled. */
888 if (head == vq->num) {
889 if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
890 vhost_disable_notify(&vs->dev, vq);
896 * Check for a sane response buffer so we can report early
897 * errors back to the guest.
899 if (unlikely(vq->iov[out].iov_len < rsp_size)) {
900 vq_err(vq, "Expecting at least virtio_scsi_cmd_resp"
901 " size, got %zu bytes\n", vq->iov[out].iov_len);
905 * Setup pointers and values based upon different virtio-scsi
906 * request header if T10_PI is enabled in KVM guest.
910 req_size = sizeof(v_req_pi);
911 lunp = &v_req_pi.lun[0];
912 target = &v_req_pi.lun[1];
915 req_size = sizeof(v_req);
916 lunp = &v_req.lun[0];
917 target = &v_req.lun[1];
920 * FIXME: Not correct for BIDI operation
922 out_size = iov_length(vq->iov, out);
923 in_size = iov_length(&vq->iov[out], in);
926 * Copy over the virtio-scsi request header, which for a
927 * ANY_LAYOUT enabled guest may span multiple iovecs, or a
928 * single iovec may contain both the header + outgoing
931 * copy_from_iter() will advance out_iter, so that it will
932 * point at the start of the outgoing WRITE payload, if
933 * DMA_TO_DEVICE is set.
935 iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size);
937 ret = copy_from_iter(req, req_size, &out_iter);
938 if (unlikely(ret != req_size)) {
939 vq_err(vq, "Faulted on copy_from_iter\n");
940 vhost_scsi_send_bad_target(vs, vq, head, out);
943 /* virtio-scsi spec requires byte 0 of the lun to be 1 */
944 if (unlikely(*lunp != 1)) {
945 vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp);
946 vhost_scsi_send_bad_target(vs, vq, head, out);
950 tpg = ACCESS_ONCE(vs_tpg[*target]);
951 if (unlikely(!tpg)) {
952 /* Target does not exist, fail the request */
953 vhost_scsi_send_bad_target(vs, vq, head, out);
957 * Determine data_direction by calculating the total outgoing
958 * iovec sizes + incoming iovec sizes vs. virtio-scsi request +
959 * response headers respectively.
961 * For DMA_TO_DEVICE this is out_iter, which is already pointing
962 * to the right place.
964 * For DMA_FROM_DEVICE, the iovec will be just past the end
965 * of the virtio-scsi response header in either the same
966 * or immediately following iovec.
968 * Any associated T10_PI bytes for the outgoing / incoming
969 * payloads are included in calculation of exp_data_len here.
973 if (out_size > req_size) {
974 data_direction = DMA_TO_DEVICE;
975 exp_data_len = out_size - req_size;
976 data_iter = out_iter;
977 } else if (in_size > rsp_size) {
978 data_direction = DMA_FROM_DEVICE;
979 exp_data_len = in_size - rsp_size;
981 iov_iter_init(&in_iter, READ, &vq->iov[out], in,
982 rsp_size + exp_data_len);
983 iov_iter_advance(&in_iter, rsp_size);
986 data_direction = DMA_NONE;
990 * If T10_PI header + payload is present, setup prot_iter values
991 * and recalculate data_iter for vhost_scsi_mapal() mapping to
992 * host scatterlists via get_user_pages_fast().
995 if (v_req_pi.pi_bytesout) {
996 if (data_direction != DMA_TO_DEVICE) {
997 vq_err(vq, "Received non zero pi_bytesout,"
998 " but wrong data_direction\n");
999 vhost_scsi_send_bad_target(vs, vq, head, out);
1002 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
1003 } else if (v_req_pi.pi_bytesin) {
1004 if (data_direction != DMA_FROM_DEVICE) {
1005 vq_err(vq, "Received non zero pi_bytesin,"
1006 " but wrong data_direction\n");
1007 vhost_scsi_send_bad_target(vs, vq, head, out);
1010 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
1013 * Set prot_iter to data_iter, and advance past any
1014 * preceeding prot_bytes that may be present.
1016 * Also fix up the exp_data_len to reflect only the
1017 * actual data payload length.
1020 exp_data_len -= prot_bytes;
1021 prot_iter = data_iter;
1022 iov_iter_advance(&data_iter, prot_bytes);
1024 tag = vhost64_to_cpu(vq, v_req_pi.tag);
1025 task_attr = v_req_pi.task_attr;
1026 cdb = &v_req_pi.cdb[0];
1027 lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
1029 tag = vhost64_to_cpu(vq, v_req.tag);
1030 task_attr = v_req.task_attr;
1031 cdb = &v_req.cdb[0];
1032 lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
1035 * Check that the received CDB size does not exceeded our
1036 * hardcoded max for vhost-scsi, then get a pre-allocated
1037 * cmd descriptor for the new virtio-scsi tag.
1039 * TODO what if cdb was too small for varlen cdb header?
1041 if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
1042 vq_err(vq, "Received SCSI CDB with command_size: %d that"
1043 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1044 scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
1045 vhost_scsi_send_bad_target(vs, vq, head, out);
1048 cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
1049 exp_data_len + prot_bytes,
1052 vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
1054 vhost_scsi_send_bad_target(vs, vq, head, out);
1057 cmd->tvc_vhost = vs;
1059 cmd->tvc_resp_iov = &vq->iov[out];
1060 cmd->tvc_in_iovs = in;
1062 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1063 cmd->tvc_cdb[0], cmd->tvc_lun);
1064 pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1065 " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
1067 if (data_direction != DMA_NONE) {
1068 ret = vhost_scsi_mapal(cmd,
1069 prot_bytes, &prot_iter,
1070 exp_data_len, &data_iter);
1071 if (unlikely(ret)) {
1072 vq_err(vq, "Failed to map iov to sgl\n");
1073 vhost_scsi_release_cmd(&cmd->tvc_se_cmd);
1074 vhost_scsi_send_bad_target(vs, vq, head, out);
1079 * Save the descriptor from vhost_get_vq_desc() to be used to
1080 * complete the virtio-scsi request in TCM callback context via
1081 * vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
1083 cmd->tvc_vq_desc = head;
1085 * Dispatch cmd descriptor for cmwq execution in process
1086 * context provided by vhost_scsi_workqueue. This also ensures
1087 * cmd is executed on the same kworker CPU as this vhost
1088 * thread to gain positive L2 cache locality effects.
1090 INIT_WORK(&cmd->work, vhost_scsi_submission_work);
1091 queue_work(vhost_scsi_workqueue, &cmd->work);
1094 mutex_unlock(&vq->mutex);
1097 static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1099 pr_debug("%s: The handling func for control queue.\n", __func__);
1103 vhost_scsi_send_evt(struct vhost_scsi *vs,
1104 struct vhost_scsi_tpg *tpg,
1109 struct vhost_scsi_evt *evt;
1111 evt = vhost_scsi_allocate_evt(vs, event, reason);
1116 /* TODO: share lun setup code with virtio-scsi.ko */
1118 * Note: evt->event is zeroed when we allocate it and
1119 * lun[4-7] need to be zero according to virtio-scsi spec.
1121 evt->event.lun[0] = 0x01;
1122 evt->event.lun[1] = tpg->tport_tpgt;
1123 if (lun->unpacked_lun >= 256)
1124 evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1125 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1128 llist_add(&evt->list, &vs->vs_event_list);
1129 vhost_work_queue(&vs->dev, &vs->vs_event_work);
1132 static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1134 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1136 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1138 mutex_lock(&vq->mutex);
1139 if (!vq->private_data)
1142 if (vs->vs_events_missed)
1143 vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
1145 mutex_unlock(&vq->mutex);
1148 static void vhost_scsi_handle_kick(struct vhost_work *work)
1150 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1152 struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1154 vhost_scsi_handle_vq(vs, vq);
1157 static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
1159 vhost_poll_flush(&vs->vqs[index].vq.poll);
1162 /* Callers must hold dev mutex */
1163 static void vhost_scsi_flush(struct vhost_scsi *vs)
1165 struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
1168 /* Init new inflight and remember the old inflight */
1169 vhost_scsi_init_inflight(vs, old_inflight);
1172 * The inflight->kref was initialized to 1. We decrement it here to
1173 * indicate the start of the flush operation so that it will reach 0
1174 * when all the reqs are finished.
1176 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1177 kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight);
1179 /* Flush both the vhost poll and vhost work */
1180 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1181 vhost_scsi_flush_vq(vs, i);
1182 vhost_work_flush(&vs->dev, &vs->vs_completion_work);
1183 vhost_work_flush(&vs->dev, &vs->vs_event_work);
1185 /* Wait for all reqs issued before the flush to be finished */
1186 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1187 wait_for_completion(&old_inflight[i]->comp);
1191 * Called from vhost_scsi_ioctl() context to walk the list of available
1192 * vhost_scsi_tpg with an active struct vhost_scsi_nexus
1194 * The lock nesting rule is:
1195 * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
1198 vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1199 struct vhost_scsi_target *t)
1201 struct se_portal_group *se_tpg;
1202 struct vhost_scsi_tport *tv_tport;
1203 struct vhost_scsi_tpg *tpg;
1204 struct vhost_scsi_tpg **vs_tpg;
1205 struct vhost_virtqueue *vq;
1206 int index, ret, i, len;
1209 mutex_lock(&vhost_scsi_mutex);
1210 mutex_lock(&vs->dev.mutex);
1212 /* Verify that ring has been setup correctly. */
1213 for (index = 0; index < vs->dev.nvqs; ++index) {
1214 /* Verify that ring has been setup correctly. */
1215 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1221 len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1222 vs_tpg = kzalloc(len, GFP_KERNEL);
1228 memcpy(vs_tpg, vs->vs_tpg, len);
1230 list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
1231 mutex_lock(&tpg->tv_tpg_mutex);
1232 if (!tpg->tpg_nexus) {
1233 mutex_unlock(&tpg->tv_tpg_mutex);
1236 if (tpg->tv_tpg_vhost_count != 0) {
1237 mutex_unlock(&tpg->tv_tpg_mutex);
1240 tv_tport = tpg->tport;
1242 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1243 if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
1245 mutex_unlock(&tpg->tv_tpg_mutex);
1250 * In order to ensure individual vhost-scsi configfs
1251 * groups cannot be removed while in use by vhost ioctl,
1252 * go ahead and take an explicit se_tpg->tpg_group.cg_item
1255 se_tpg = &tpg->se_tpg;
1256 ret = target_depend_item(&se_tpg->tpg_group.cg_item);
1258 pr_warn("configfs_depend_item() failed: %d\n", ret);
1260 mutex_unlock(&tpg->tv_tpg_mutex);
1263 tpg->tv_tpg_vhost_count++;
1264 tpg->vhost_scsi = vs;
1265 vs_tpg[tpg->tport_tpgt] = tpg;
1266 smp_mb__after_atomic();
1269 mutex_unlock(&tpg->tv_tpg_mutex);
1273 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1274 sizeof(vs->vs_vhost_wwpn));
1275 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1276 vq = &vs->vqs[i].vq;
1277 mutex_lock(&vq->mutex);
1278 vq->private_data = vs_tpg;
1279 vhost_init_used(vq);
1280 mutex_unlock(&vq->mutex);
1288 * Act as synchronize_rcu to make sure access to
1289 * old vs->vs_tpg is finished.
1291 vhost_scsi_flush(vs);
1293 vs->vs_tpg = vs_tpg;
1296 mutex_unlock(&vs->dev.mutex);
1297 mutex_unlock(&vhost_scsi_mutex);
1302 vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1303 struct vhost_scsi_target *t)
1305 struct se_portal_group *se_tpg;
1306 struct vhost_scsi_tport *tv_tport;
1307 struct vhost_scsi_tpg *tpg;
1308 struct vhost_virtqueue *vq;
1313 mutex_lock(&vhost_scsi_mutex);
1314 mutex_lock(&vs->dev.mutex);
1315 /* Verify that ring has been setup correctly. */
1316 for (index = 0; index < vs->dev.nvqs; ++index) {
1317 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1328 for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1330 tpg = vs->vs_tpg[target];
1334 mutex_lock(&tpg->tv_tpg_mutex);
1335 tv_tport = tpg->tport;
1341 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1342 pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
1343 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1344 tv_tport->tport_name, tpg->tport_tpgt,
1345 t->vhost_wwpn, t->vhost_tpgt);
1349 tpg->tv_tpg_vhost_count--;
1350 tpg->vhost_scsi = NULL;
1351 vs->vs_tpg[target] = NULL;
1353 mutex_unlock(&tpg->tv_tpg_mutex);
1355 * Release se_tpg->tpg_group.cg_item configfs dependency now
1356 * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur.
1358 se_tpg = &tpg->se_tpg;
1359 target_undepend_item(&se_tpg->tpg_group.cg_item);
1362 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1363 vq = &vs->vqs[i].vq;
1364 mutex_lock(&vq->mutex);
1365 vq->private_data = NULL;
1366 mutex_unlock(&vq->mutex);
1370 * Act as synchronize_rcu to make sure access to
1371 * old vs->vs_tpg is finished.
1373 vhost_scsi_flush(vs);
1376 WARN_ON(vs->vs_events_nr);
1377 mutex_unlock(&vs->dev.mutex);
1378 mutex_unlock(&vhost_scsi_mutex);
1382 mutex_unlock(&tpg->tv_tpg_mutex);
1384 mutex_unlock(&vs->dev.mutex);
1385 mutex_unlock(&vhost_scsi_mutex);
1389 static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1391 struct vhost_virtqueue *vq;
1394 if (features & ~VHOST_SCSI_FEATURES)
1397 mutex_lock(&vs->dev.mutex);
1398 if ((features & (1 << VHOST_F_LOG_ALL)) &&
1399 !vhost_log_access_ok(&vs->dev)) {
1400 mutex_unlock(&vs->dev.mutex);
1404 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1405 vq = &vs->vqs[i].vq;
1406 mutex_lock(&vq->mutex);
1407 vq->acked_features = features;
1408 mutex_unlock(&vq->mutex);
1410 mutex_unlock(&vs->dev.mutex);
1414 static int vhost_scsi_open(struct inode *inode, struct file *f)
1416 struct vhost_scsi *vs;
1417 struct vhost_virtqueue **vqs;
1420 vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
1422 vs = vzalloc(sizeof(*vs));
1427 vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
1431 vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
1432 vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
1434 vs->vs_events_nr = 0;
1435 vs->vs_events_missed = false;
1437 vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1438 vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1439 vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1440 vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
1441 for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
1442 vqs[i] = &vs->vqs[i].vq;
1443 vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
1445 vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);
1447 vhost_scsi_init_inflight(vs, NULL);
1449 f->private_data = vs;
1458 static int vhost_scsi_release(struct inode *inode, struct file *f)
1460 struct vhost_scsi *vs = f->private_data;
1461 struct vhost_scsi_target t;
1463 mutex_lock(&vs->dev.mutex);
1464 memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1465 mutex_unlock(&vs->dev.mutex);
1466 vhost_scsi_clear_endpoint(vs, &t);
1467 vhost_dev_stop(&vs->dev);
1468 vhost_dev_cleanup(&vs->dev, false);
1469 /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
1470 vhost_scsi_flush(vs);
1477 vhost_scsi_ioctl(struct file *f,
1481 struct vhost_scsi *vs = f->private_data;
1482 struct vhost_scsi_target backend;
1483 void __user *argp = (void __user *)arg;
1484 u64 __user *featurep = argp;
1485 u32 __user *eventsp = argp;
1488 int r, abi_version = VHOST_SCSI_ABI_VERSION;
1489 struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1492 case VHOST_SCSI_SET_ENDPOINT:
1493 if (copy_from_user(&backend, argp, sizeof backend))
1495 if (backend.reserved != 0)
1498 return vhost_scsi_set_endpoint(vs, &backend);
1499 case VHOST_SCSI_CLEAR_ENDPOINT:
1500 if (copy_from_user(&backend, argp, sizeof backend))
1502 if (backend.reserved != 0)
1505 return vhost_scsi_clear_endpoint(vs, &backend);
1506 case VHOST_SCSI_GET_ABI_VERSION:
1507 if (copy_to_user(argp, &abi_version, sizeof abi_version))
1510 case VHOST_SCSI_SET_EVENTS_MISSED:
1511 if (get_user(events_missed, eventsp))
1513 mutex_lock(&vq->mutex);
1514 vs->vs_events_missed = events_missed;
1515 mutex_unlock(&vq->mutex);
1517 case VHOST_SCSI_GET_EVENTS_MISSED:
1518 mutex_lock(&vq->mutex);
1519 events_missed = vs->vs_events_missed;
1520 mutex_unlock(&vq->mutex);
1521 if (put_user(events_missed, eventsp))
1524 case VHOST_GET_FEATURES:
1525 features = VHOST_SCSI_FEATURES;
1526 if (copy_to_user(featurep, &features, sizeof features))
1529 case VHOST_SET_FEATURES:
1530 if (copy_from_user(&features, featurep, sizeof features))
1532 return vhost_scsi_set_features(vs, features);
1534 mutex_lock(&vs->dev.mutex);
1535 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1536 /* TODO: flush backend after dev ioctl. */
1537 if (r == -ENOIOCTLCMD)
1538 r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
1539 mutex_unlock(&vs->dev.mutex);
1544 #ifdef CONFIG_COMPAT
1545 static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1548 return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1552 static const struct file_operations vhost_scsi_fops = {
1553 .owner = THIS_MODULE,
1554 .release = vhost_scsi_release,
1555 .unlocked_ioctl = vhost_scsi_ioctl,
1556 #ifdef CONFIG_COMPAT
1557 .compat_ioctl = vhost_scsi_compat_ioctl,
1559 .open = vhost_scsi_open,
1560 .llseek = noop_llseek,
1563 static struct miscdevice vhost_scsi_misc = {
1569 static int __init vhost_scsi_register(void)
1571 return misc_register(&vhost_scsi_misc);
1574 static void vhost_scsi_deregister(void)
1576 misc_deregister(&vhost_scsi_misc);
1579 static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
1581 switch (tport->tport_proto_id) {
1582 case SCSI_PROTOCOL_SAS:
1584 case SCSI_PROTOCOL_FCP:
1586 case SCSI_PROTOCOL_ISCSI:
1596 vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
1597 struct se_lun *lun, bool plug)
1600 struct vhost_scsi *vs = tpg->vhost_scsi;
1601 struct vhost_virtqueue *vq;
1607 mutex_lock(&vs->dev.mutex);
1610 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1612 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1614 vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1615 mutex_lock(&vq->mutex);
1616 if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
1617 vhost_scsi_send_evt(vs, tpg, lun,
1618 VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
1619 mutex_unlock(&vq->mutex);
1620 mutex_unlock(&vs->dev.mutex);
1623 static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1625 vhost_scsi_do_plug(tpg, lun, true);
1628 static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1630 vhost_scsi_do_plug(tpg, lun, false);
1633 static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
1636 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1637 struct vhost_scsi_tpg, se_tpg);
1639 mutex_lock(&vhost_scsi_mutex);
1641 mutex_lock(&tpg->tv_tpg_mutex);
1642 tpg->tv_tpg_port_count++;
1643 mutex_unlock(&tpg->tv_tpg_mutex);
1645 vhost_scsi_hotplug(tpg, lun);
1647 mutex_unlock(&vhost_scsi_mutex);
1652 static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
1655 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1656 struct vhost_scsi_tpg, se_tpg);
1658 mutex_lock(&vhost_scsi_mutex);
1660 mutex_lock(&tpg->tv_tpg_mutex);
1661 tpg->tv_tpg_port_count--;
1662 mutex_unlock(&tpg->tv_tpg_mutex);
1664 vhost_scsi_hotunplug(tpg, lun);
1666 mutex_unlock(&vhost_scsi_mutex);
1669 static void vhost_scsi_free_cmd_map_res(struct vhost_scsi_nexus *nexus,
1670 struct se_session *se_sess)
1672 struct vhost_scsi_cmd *tv_cmd;
1675 if (!se_sess->sess_cmd_map)
1678 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1679 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1681 kfree(tv_cmd->tvc_sgl);
1682 kfree(tv_cmd->tvc_prot_sgl);
1683 kfree(tv_cmd->tvc_upages);
1687 static ssize_t vhost_scsi_tpg_attrib_store_fabric_prot_type(
1688 struct se_portal_group *se_tpg,
1692 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1693 struct vhost_scsi_tpg, se_tpg);
1695 int ret = kstrtoul(page, 0, &val);
1698 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
1701 if (val != 0 && val != 1 && val != 3) {
1702 pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
1705 tpg->tv_fabric_prot_type = val;
1710 static ssize_t vhost_scsi_tpg_attrib_show_fabric_prot_type(
1711 struct se_portal_group *se_tpg,
1714 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1715 struct vhost_scsi_tpg, se_tpg);
1717 return sprintf(page, "%d\n", tpg->tv_fabric_prot_type);
1719 TF_TPG_ATTRIB_ATTR(vhost_scsi, fabric_prot_type, S_IRUGO | S_IWUSR);
1721 static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
1722 &vhost_scsi_tpg_attrib_fabric_prot_type.attr,
1726 static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
1729 struct se_portal_group *se_tpg;
1730 struct se_session *se_sess;
1731 struct vhost_scsi_nexus *tv_nexus;
1732 struct vhost_scsi_cmd *tv_cmd;
1735 mutex_lock(&tpg->tv_tpg_mutex);
1736 if (tpg->tpg_nexus) {
1737 mutex_unlock(&tpg->tv_tpg_mutex);
1738 pr_debug("tpg->tpg_nexus already exists\n");
1741 se_tpg = &tpg->se_tpg;
1743 tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL);
1745 mutex_unlock(&tpg->tv_tpg_mutex);
1746 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
1750 * Initialize the struct se_session pointer and setup tagpool
1751 * for struct vhost_scsi_cmd descriptors
1753 tv_nexus->tvn_se_sess = transport_init_session_tags(
1754 VHOST_SCSI_DEFAULT_TAGS,
1755 sizeof(struct vhost_scsi_cmd),
1756 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS);
1757 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1758 mutex_unlock(&tpg->tv_tpg_mutex);
1762 se_sess = tv_nexus->tvn_se_sess;
1763 for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1764 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1766 tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) *
1767 VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL);
1768 if (!tv_cmd->tvc_sgl) {
1769 mutex_unlock(&tpg->tv_tpg_mutex);
1770 pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1774 tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
1775 VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL);
1776 if (!tv_cmd->tvc_upages) {
1777 mutex_unlock(&tpg->tv_tpg_mutex);
1778 pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1782 tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
1783 VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL);
1784 if (!tv_cmd->tvc_prot_sgl) {
1785 mutex_unlock(&tpg->tv_tpg_mutex);
1786 pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1791 * Since we are running in 'demo mode' this call with generate a
1792 * struct se_node_acl for the vhost_scsi struct se_portal_group with
1793 * the SCSI Initiator port name of the passed configfs group 'name'.
1795 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1796 se_tpg, (unsigned char *)name);
1797 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1798 mutex_unlock(&tpg->tv_tpg_mutex);
1799 pr_debug("core_tpg_check_initiator_node_acl() failed"
1804 * Now register the TCM vhost virtual I_T Nexus as active.
1806 transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1807 tv_nexus->tvn_se_sess, tv_nexus);
1808 tpg->tpg_nexus = tv_nexus;
1810 mutex_unlock(&tpg->tv_tpg_mutex);
1814 vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
1815 transport_free_session(se_sess);
1820 static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
1822 struct se_session *se_sess;
1823 struct vhost_scsi_nexus *tv_nexus;
1825 mutex_lock(&tpg->tv_tpg_mutex);
1826 tv_nexus = tpg->tpg_nexus;
1828 mutex_unlock(&tpg->tv_tpg_mutex);
1832 se_sess = tv_nexus->tvn_se_sess;
1834 mutex_unlock(&tpg->tv_tpg_mutex);
1838 if (tpg->tv_tpg_port_count != 0) {
1839 mutex_unlock(&tpg->tv_tpg_mutex);
1840 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1841 " active TPG port count: %d\n",
1842 tpg->tv_tpg_port_count);
1846 if (tpg->tv_tpg_vhost_count != 0) {
1847 mutex_unlock(&tpg->tv_tpg_mutex);
1848 pr_err("Unable to remove TCM_vhost I_T Nexus with"
1849 " active TPG vhost count: %d\n",
1850 tpg->tv_tpg_vhost_count);
1854 pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
1855 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
1856 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1858 vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
1860 * Release the SCSI I_T Nexus to the emulated vhost Target Port
1862 transport_deregister_session(tv_nexus->tvn_se_sess);
1863 tpg->tpg_nexus = NULL;
1864 mutex_unlock(&tpg->tv_tpg_mutex);
1870 static ssize_t vhost_scsi_tpg_show_nexus(struct se_portal_group *se_tpg,
1873 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1874 struct vhost_scsi_tpg, se_tpg);
1875 struct vhost_scsi_nexus *tv_nexus;
1878 mutex_lock(&tpg->tv_tpg_mutex);
1879 tv_nexus = tpg->tpg_nexus;
1881 mutex_unlock(&tpg->tv_tpg_mutex);
1884 ret = snprintf(page, PAGE_SIZE, "%s\n",
1885 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1886 mutex_unlock(&tpg->tv_tpg_mutex);
1891 static ssize_t vhost_scsi_tpg_store_nexus(struct se_portal_group *se_tpg,
1895 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1896 struct vhost_scsi_tpg, se_tpg);
1897 struct vhost_scsi_tport *tport_wwn = tpg->tport;
1898 unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
1901 * Shutdown the active I_T nexus if 'NULL' is passed..
1903 if (!strncmp(page, "NULL", 4)) {
1904 ret = vhost_scsi_drop_nexus(tpg);
1905 return (!ret) ? count : ret;
1908 * Otherwise make sure the passed virtual Initiator port WWN matches
1909 * the fabric protocol_id set in vhost_scsi_make_tport(), and call
1910 * vhost_scsi_make_nexus().
1912 if (strlen(page) >= VHOST_SCSI_NAMELEN) {
1913 pr_err("Emulated NAA Sas Address: %s, exceeds"
1914 " max: %d\n", page, VHOST_SCSI_NAMELEN);
1917 snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
1919 ptr = strstr(i_port, "naa.");
1921 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1922 pr_err("Passed SAS Initiator Port %s does not"
1923 " match target port protoid: %s\n", i_port,
1924 vhost_scsi_dump_proto_id(tport_wwn));
1927 port_ptr = &i_port[0];
1930 ptr = strstr(i_port, "fc.");
1932 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1933 pr_err("Passed FCP Initiator Port %s does not"
1934 " match target port protoid: %s\n", i_port,
1935 vhost_scsi_dump_proto_id(tport_wwn));
1938 port_ptr = &i_port[3]; /* Skip over "fc." */
1941 ptr = strstr(i_port, "iqn.");
1943 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1944 pr_err("Passed iSCSI Initiator Port %s does not"
1945 " match target port protoid: %s\n", i_port,
1946 vhost_scsi_dump_proto_id(tport_wwn));
1949 port_ptr = &i_port[0];
1952 pr_err("Unable to locate prefix for emulated Initiator Port:"
1956 * Clear any trailing newline for the NAA WWN
1959 if (i_port[strlen(i_port)-1] == '\n')
1960 i_port[strlen(i_port)-1] = '\0';
1962 ret = vhost_scsi_make_nexus(tpg, port_ptr);
1969 TF_TPG_BASE_ATTR(vhost_scsi, nexus, S_IRUGO | S_IWUSR);
1971 static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
1972 &vhost_scsi_tpg_nexus.attr,
1976 static struct se_portal_group *
1977 vhost_scsi_make_tpg(struct se_wwn *wwn,
1978 struct config_group *group,
1981 struct vhost_scsi_tport *tport = container_of(wwn,
1982 struct vhost_scsi_tport, tport_wwn);
1984 struct vhost_scsi_tpg *tpg;
1988 if (strstr(name, "tpgt_") != name)
1989 return ERR_PTR(-EINVAL);
1990 if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
1991 return ERR_PTR(-EINVAL);
1993 tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL);
1995 pr_err("Unable to allocate struct vhost_scsi_tpg");
1996 return ERR_PTR(-ENOMEM);
1998 mutex_init(&tpg->tv_tpg_mutex);
1999 INIT_LIST_HEAD(&tpg->tv_tpg_list);
2001 tpg->tport_tpgt = tpgt;
2003 ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id);
2008 mutex_lock(&vhost_scsi_mutex);
2009 list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
2010 mutex_unlock(&vhost_scsi_mutex);
2012 return &tpg->se_tpg;
2015 static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
2017 struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2018 struct vhost_scsi_tpg, se_tpg);
2020 mutex_lock(&vhost_scsi_mutex);
2021 list_del(&tpg->tv_tpg_list);
2022 mutex_unlock(&vhost_scsi_mutex);
2024 * Release the virtual I_T Nexus for this vhost TPG
2026 vhost_scsi_drop_nexus(tpg);
2028 * Deregister the se_tpg from TCM..
2030 core_tpg_deregister(se_tpg);
2034 static struct se_wwn *
2035 vhost_scsi_make_tport(struct target_fabric_configfs *tf,
2036 struct config_group *group,
2039 struct vhost_scsi_tport *tport;
2044 /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
2045 return ERR_PTR(-EINVAL); */
2047 tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL);
2049 pr_err("Unable to allocate struct vhost_scsi_tport");
2050 return ERR_PTR(-ENOMEM);
2052 tport->tport_wwpn = wwpn;
2054 * Determine the emulated Protocol Identifier and Target Port Name
2055 * based on the incoming configfs directory name.
2057 ptr = strstr(name, "naa.");
2059 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2062 ptr = strstr(name, "fc.");
2064 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2065 off = 3; /* Skip over "fc." */
2068 ptr = strstr(name, "iqn.");
2070 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2074 pr_err("Unable to locate prefix for emulated Target Port:"
2077 return ERR_PTR(-EINVAL);
2080 if (strlen(name) >= VHOST_SCSI_NAMELEN) {
2081 pr_err("Emulated %s Address: %s, exceeds"
2082 " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2083 VHOST_SCSI_NAMELEN);
2085 return ERR_PTR(-EINVAL);
2087 snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
2089 pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2090 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
2092 return &tport->tport_wwn;
2095 static void vhost_scsi_drop_tport(struct se_wwn *wwn)
2097 struct vhost_scsi_tport *tport = container_of(wwn,
2098 struct vhost_scsi_tport, tport_wwn);
2100 pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2101 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
2108 vhost_scsi_wwn_show_attr_version(struct target_fabric_configfs *tf,
2111 return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
2112 "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2113 utsname()->machine);
2116 TF_WWN_ATTR_RO(vhost_scsi, version);
2118 static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
2119 &vhost_scsi_wwn_version.attr,
2123 static struct target_core_fabric_ops vhost_scsi_ops = {
2124 .module = THIS_MODULE,
2126 .get_fabric_name = vhost_scsi_get_fabric_name,
2127 .tpg_get_wwn = vhost_scsi_get_fabric_wwn,
2128 .tpg_get_tag = vhost_scsi_get_tpgt,
2129 .tpg_check_demo_mode = vhost_scsi_check_true,
2130 .tpg_check_demo_mode_cache = vhost_scsi_check_true,
2131 .tpg_check_demo_mode_write_protect = vhost_scsi_check_false,
2132 .tpg_check_prod_mode_write_protect = vhost_scsi_check_false,
2133 .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only,
2134 .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index,
2135 .release_cmd = vhost_scsi_release_cmd,
2136 .check_stop_free = vhost_scsi_check_stop_free,
2137 .shutdown_session = vhost_scsi_shutdown_session,
2138 .close_session = vhost_scsi_close_session,
2139 .sess_get_index = vhost_scsi_sess_get_index,
2140 .sess_get_initiator_sid = NULL,
2141 .write_pending = vhost_scsi_write_pending,
2142 .write_pending_status = vhost_scsi_write_pending_status,
2143 .set_default_node_attributes = vhost_scsi_set_default_node_attrs,
2144 .get_cmd_state = vhost_scsi_get_cmd_state,
2145 .queue_data_in = vhost_scsi_queue_data_in,
2146 .queue_status = vhost_scsi_queue_status,
2147 .queue_tm_rsp = vhost_scsi_queue_tm_rsp,
2148 .aborted_task = vhost_scsi_aborted_task,
2150 * Setup callers for generic logic in target_core_fabric_configfs.c
2152 .fabric_make_wwn = vhost_scsi_make_tport,
2153 .fabric_drop_wwn = vhost_scsi_drop_tport,
2154 .fabric_make_tpg = vhost_scsi_make_tpg,
2155 .fabric_drop_tpg = vhost_scsi_drop_tpg,
2156 .fabric_post_link = vhost_scsi_port_link,
2157 .fabric_pre_unlink = vhost_scsi_port_unlink,
2159 .tfc_wwn_attrs = vhost_scsi_wwn_attrs,
2160 .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs,
2161 .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs,
2164 static int __init vhost_scsi_init(void)
2168 pr_debug("TCM_VHOST fabric module %s on %s/%s"
2169 " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2170 utsname()->machine);
2173 * Use our own dedicated workqueue for submitting I/O into
2174 * target core to avoid contention within system_wq.
2176 vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
2177 if (!vhost_scsi_workqueue)
2180 ret = vhost_scsi_register();
2182 goto out_destroy_workqueue;
2184 ret = target_register_template(&vhost_scsi_ops);
2186 goto out_vhost_scsi_deregister;
2190 out_vhost_scsi_deregister:
2191 vhost_scsi_deregister();
2192 out_destroy_workqueue:
2193 destroy_workqueue(vhost_scsi_workqueue);
2198 static void vhost_scsi_exit(void)
2200 target_unregister_template(&vhost_scsi_ops);
2201 vhost_scsi_deregister();
2202 destroy_workqueue(vhost_scsi_workqueue);
2205 MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2206 MODULE_ALIAS("tcm_vhost");
2207 MODULE_LICENSE("GPL");
2208 module_init(vhost_scsi_init);
2209 module_exit(vhost_scsi_exit);