drivers/target: Add export.h to files as required.
[linux-2.6.git] / drivers / target / target_core_device.c
1 /*******************************************************************************
2  * Filename:  target_core_device.c (based on iscsi_target_device.c)
3  *
4  * This file contains the TCM Virtual Device and Disk Transport
5  * agnostic related functions.
6  *
7  * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
8  * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
9  * Copyright (c) 2007-2010 Rising Tide Systems
10  * Copyright (c) 2008-2010 Linux-iSCSI.org
11  *
12  * Nicholas A. Bellinger <nab@kernel.org>
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License as published by
16  * the Free Software Foundation; either version 2 of the License, or
17  * (at your option) any later version.
18  *
19  * This program is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22  * GNU General Public License for more details.
23  *
24  * You should have received a copy of the GNU General Public License
25  * along with this program; if not, write to the Free Software
26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27  *
28  ******************************************************************************/
29
30 #include <linux/net.h>
31 #include <linux/string.h>
32 #include <linux/delay.h>
33 #include <linux/timer.h>
34 #include <linux/slab.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
37 #include <linux/in.h>
38 #include <linux/export.h>
39 #include <net/sock.h>
40 #include <net/tcp.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_device.h>
43
44 #include <target/target_core_base.h>
45 #include <target/target_core_device.h>
46 #include <target/target_core_tpg.h>
47 #include <target/target_core_transport.h>
48 #include <target/target_core_fabric_ops.h>
49
50 #include "target_core_alua.h"
51 #include "target_core_hba.h"
52 #include "target_core_pr.h"
53 #include "target_core_ua.h"
54
55 static void se_dev_start(struct se_device *dev);
56 static void se_dev_stop(struct se_device *dev);
57
58 static struct se_hba *lun0_hba;
59 static struct se_subsystem_dev *lun0_su_dev;
60 /* not static, needed by tpg.c */
61 struct se_device *g_lun0_dev;
62
63 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
64 {
65         struct se_lun *se_lun = NULL;
66         struct se_session *se_sess = se_cmd->se_sess;
67         struct se_device *dev;
68         unsigned long flags;
69
70         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
71                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
72                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
73                 return -ENODEV;
74         }
75
76         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
77         se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
78         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
79                 struct se_dev_entry *deve = se_cmd->se_deve;
80
81                 deve->total_cmds++;
82                 deve->total_bytes += se_cmd->data_length;
83
84                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
85                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
86                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
87                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
88                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
89                                 " Access for 0x%08x\n",
90                                 se_cmd->se_tfo->get_fabric_name(),
91                                 unpacked_lun);
92                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
93                         return -EACCES;
94                 }
95
96                 if (se_cmd->data_direction == DMA_TO_DEVICE)
97                         deve->write_bytes += se_cmd->data_length;
98                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
99                         deve->read_bytes += se_cmd->data_length;
100
101                 deve->deve_cmds++;
102
103                 se_lun = deve->se_lun;
104                 se_cmd->se_lun = deve->se_lun;
105                 se_cmd->pr_res_key = deve->pr_res_key;
106                 se_cmd->orig_fe_lun = unpacked_lun;
107                 se_cmd->se_orig_obj_ptr = se_cmd->se_lun->lun_se_dev;
108                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
109         }
110         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
111
112         if (!se_lun) {
113                 /*
114                  * Use the se_portal_group->tpg_virt_lun0 to allow for
115                  * REPORT_LUNS, et al to be returned when no active
116                  * MappedLUN=0 exists for this Initiator Port.
117                  */
118                 if (unpacked_lun != 0) {
119                         se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
120                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
121                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
122                                 " Access for 0x%08x\n",
123                                 se_cmd->se_tfo->get_fabric_name(),
124                                 unpacked_lun);
125                         return -ENODEV;
126                 }
127                 /*
128                  * Force WRITE PROTECT for virtual LUN 0
129                  */
130                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
131                     (se_cmd->data_direction != DMA_NONE)) {
132                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
133                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
134                         return -EACCES;
135                 }
136
137                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
138                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
139                 se_cmd->orig_fe_lun = 0;
140                 se_cmd->se_orig_obj_ptr = se_cmd->se_lun->lun_se_dev;
141                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
142         }
143         /*
144          * Determine if the struct se_lun is online.
145          * FIXME: Check for LUN_RESET + UNIT Attention
146          */
147         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
148                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
149                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
150                 return -ENODEV;
151         }
152
153         /* Directly associate cmd with se_dev */
154         se_cmd->se_dev = se_lun->lun_se_dev;
155
156         /* TODO: get rid of this and use atomics for stats */
157         dev = se_lun->lun_se_dev;
158         spin_lock_irqsave(&dev->stats_lock, flags);
159         dev->num_cmds++;
160         if (se_cmd->data_direction == DMA_TO_DEVICE)
161                 dev->write_bytes += se_cmd->data_length;
162         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
163                 dev->read_bytes += se_cmd->data_length;
164         spin_unlock_irqrestore(&dev->stats_lock, flags);
165
166         /*
167          * Add the iscsi_cmd_t to the struct se_lun's cmd list.  This list is used
168          * for tracking state of struct se_cmds during LUN shutdown events.
169          */
170         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
171         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
172         atomic_set(&se_cmd->transport_lun_active, 1);
173         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
174
175         return 0;
176 }
177 EXPORT_SYMBOL(transport_lookup_cmd_lun);
178
179 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
180 {
181         struct se_dev_entry *deve;
182         struct se_lun *se_lun = NULL;
183         struct se_session *se_sess = se_cmd->se_sess;
184         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
185         unsigned long flags;
186
187         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
188                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
189                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
190                 return -ENODEV;
191         }
192
193         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
194         se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
195         deve = se_cmd->se_deve;
196
197         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
198                 se_tmr->tmr_lun = deve->se_lun;
199                 se_cmd->se_lun = deve->se_lun;
200                 se_lun = deve->se_lun;
201                 se_cmd->pr_res_key = deve->pr_res_key;
202                 se_cmd->orig_fe_lun = unpacked_lun;
203                 se_cmd->se_orig_obj_ptr = se_cmd->se_dev;
204         }
205         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
206
207         if (!se_lun) {
208                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
209                         " Access for 0x%08x\n",
210                         se_cmd->se_tfo->get_fabric_name(),
211                         unpacked_lun);
212                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
213                 return -ENODEV;
214         }
215         /*
216          * Determine if the struct se_lun is online.
217          * FIXME: Check for LUN_RESET + UNIT Attention
218          */
219         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
220                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
221                 return -ENODEV;
222         }
223
224         /* Directly associate cmd with se_dev */
225         se_cmd->se_dev = se_lun->lun_se_dev;
226         se_tmr->tmr_dev = se_lun->lun_se_dev;
227
228         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
229         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
230         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
231
232         return 0;
233 }
234 EXPORT_SYMBOL(transport_lookup_tmr_lun);
235
236 /*
237  * This function is called from core_scsi3_emulate_pro_register_and_move()
238  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
239  * when a matching rtpi is found.
240  */
241 struct se_dev_entry *core_get_se_deve_from_rtpi(
242         struct se_node_acl *nacl,
243         u16 rtpi)
244 {
245         struct se_dev_entry *deve;
246         struct se_lun *lun;
247         struct se_port *port;
248         struct se_portal_group *tpg = nacl->se_tpg;
249         u32 i;
250
251         spin_lock_irq(&nacl->device_list_lock);
252         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
253                 deve = &nacl->device_list[i];
254
255                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
256                         continue;
257
258                 lun = deve->se_lun;
259                 if (!lun) {
260                         pr_err("%s device entries device pointer is"
261                                 " NULL, but Initiator has access.\n",
262                                 tpg->se_tpg_tfo->get_fabric_name());
263                         continue;
264                 }
265                 port = lun->lun_sep;
266                 if (!port) {
267                         pr_err("%s device entries device pointer is"
268                                 " NULL, but Initiator has access.\n",
269                                 tpg->se_tpg_tfo->get_fabric_name());
270                         continue;
271                 }
272                 if (port->sep_rtpi != rtpi)
273                         continue;
274
275                 atomic_inc(&deve->pr_ref_count);
276                 smp_mb__after_atomic_inc();
277                 spin_unlock_irq(&nacl->device_list_lock);
278
279                 return deve;
280         }
281         spin_unlock_irq(&nacl->device_list_lock);
282
283         return NULL;
284 }
285
286 int core_free_device_list_for_node(
287         struct se_node_acl *nacl,
288         struct se_portal_group *tpg)
289 {
290         struct se_dev_entry *deve;
291         struct se_lun *lun;
292         u32 i;
293
294         if (!nacl->device_list)
295                 return 0;
296
297         spin_lock_irq(&nacl->device_list_lock);
298         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
299                 deve = &nacl->device_list[i];
300
301                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
302                         continue;
303
304                 if (!deve->se_lun) {
305                         pr_err("%s device entries device pointer is"
306                                 " NULL, but Initiator has access.\n",
307                                 tpg->se_tpg_tfo->get_fabric_name());
308                         continue;
309                 }
310                 lun = deve->se_lun;
311
312                 spin_unlock_irq(&nacl->device_list_lock);
313                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
314                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
315                 spin_lock_irq(&nacl->device_list_lock);
316         }
317         spin_unlock_irq(&nacl->device_list_lock);
318
319         kfree(nacl->device_list);
320         nacl->device_list = NULL;
321
322         return 0;
323 }
324
325 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
326 {
327         struct se_dev_entry *deve;
328
329         spin_lock_irq(&se_nacl->device_list_lock);
330         deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
331         deve->deve_cmds--;
332         spin_unlock_irq(&se_nacl->device_list_lock);
333 }
334
335 void core_update_device_list_access(
336         u32 mapped_lun,
337         u32 lun_access,
338         struct se_node_acl *nacl)
339 {
340         struct se_dev_entry *deve;
341
342         spin_lock_irq(&nacl->device_list_lock);
343         deve = &nacl->device_list[mapped_lun];
344         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
345                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
346                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
347         } else {
348                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
349                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
350         }
351         spin_unlock_irq(&nacl->device_list_lock);
352 }
353
354 /*      core_update_device_list_for_node():
355  *
356  *
357  */
358 int core_update_device_list_for_node(
359         struct se_lun *lun,
360         struct se_lun_acl *lun_acl,
361         u32 mapped_lun,
362         u32 lun_access,
363         struct se_node_acl *nacl,
364         struct se_portal_group *tpg,
365         int enable)
366 {
367         struct se_port *port = lun->lun_sep;
368         struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
369         int trans = 0;
370         /*
371          * If the MappedLUN entry is being disabled, the entry in
372          * port->sep_alua_list must be removed now before clearing the
373          * struct se_dev_entry pointers below as logic in
374          * core_alua_do_transition_tg_pt() depends on these being present.
375          */
376         if (!enable) {
377                 /*
378                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
379                  * that have not been explicitly concerted to MappedLUNs ->
380                  * struct se_lun_acl, but we remove deve->alua_port_list from
381                  * port->sep_alua_list. This also means that active UAs and
382                  * NodeACL context specific PR metadata for demo-mode
383                  * MappedLUN *deve will be released below..
384                  */
385                 spin_lock_bh(&port->sep_alua_lock);
386                 list_del(&deve->alua_port_list);
387                 spin_unlock_bh(&port->sep_alua_lock);
388         }
389
390         spin_lock_irq(&nacl->device_list_lock);
391         if (enable) {
392                 /*
393                  * Check if the call is handling demo mode -> explict LUN ACL
394                  * transition.  This transition must be for the same struct se_lun
395                  * + mapped_lun that was setup in demo mode..
396                  */
397                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
398                         if (deve->se_lun_acl != NULL) {
399                                 pr_err("struct se_dev_entry->se_lun_acl"
400                                         " already set for demo mode -> explict"
401                                         " LUN ACL transition\n");
402                                 spin_unlock_irq(&nacl->device_list_lock);
403                                 return -EINVAL;
404                         }
405                         if (deve->se_lun != lun) {
406                                 pr_err("struct se_dev_entry->se_lun does"
407                                         " match passed struct se_lun for demo mode"
408                                         " -> explict LUN ACL transition\n");
409                                 spin_unlock_irq(&nacl->device_list_lock);
410                                 return -EINVAL;
411                         }
412                         deve->se_lun_acl = lun_acl;
413                         trans = 1;
414                 } else {
415                         deve->se_lun = lun;
416                         deve->se_lun_acl = lun_acl;
417                         deve->mapped_lun = mapped_lun;
418                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
419                 }
420
421                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
422                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
423                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
424                 } else {
425                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
426                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
427                 }
428
429                 if (trans) {
430                         spin_unlock_irq(&nacl->device_list_lock);
431                         return 0;
432                 }
433                 deve->creation_time = get_jiffies_64();
434                 deve->attach_count++;
435                 spin_unlock_irq(&nacl->device_list_lock);
436
437                 spin_lock_bh(&port->sep_alua_lock);
438                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
439                 spin_unlock_bh(&port->sep_alua_lock);
440
441                 return 0;
442         }
443         /*
444          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
445          * PR operation to complete.
446          */
447         spin_unlock_irq(&nacl->device_list_lock);
448         while (atomic_read(&deve->pr_ref_count) != 0)
449                 cpu_relax();
450         spin_lock_irq(&nacl->device_list_lock);
451         /*
452          * Disable struct se_dev_entry LUN ACL mapping
453          */
454         core_scsi3_ua_release_all(deve);
455         deve->se_lun = NULL;
456         deve->se_lun_acl = NULL;
457         deve->lun_flags = 0;
458         deve->creation_time = 0;
459         deve->attach_count--;
460         spin_unlock_irq(&nacl->device_list_lock);
461
462         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
463         return 0;
464 }
465
466 /*      core_clear_lun_from_tpg():
467  *
468  *
469  */
470 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
471 {
472         struct se_node_acl *nacl;
473         struct se_dev_entry *deve;
474         u32 i;
475
476         spin_lock_irq(&tpg->acl_node_lock);
477         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
478                 spin_unlock_irq(&tpg->acl_node_lock);
479
480                 spin_lock_irq(&nacl->device_list_lock);
481                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
482                         deve = &nacl->device_list[i];
483                         if (lun != deve->se_lun)
484                                 continue;
485                         spin_unlock_irq(&nacl->device_list_lock);
486
487                         core_update_device_list_for_node(lun, NULL,
488                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
489                                 nacl, tpg, 0);
490
491                         spin_lock_irq(&nacl->device_list_lock);
492                 }
493                 spin_unlock_irq(&nacl->device_list_lock);
494
495                 spin_lock_irq(&tpg->acl_node_lock);
496         }
497         spin_unlock_irq(&tpg->acl_node_lock);
498 }
499
500 static struct se_port *core_alloc_port(struct se_device *dev)
501 {
502         struct se_port *port, *port_tmp;
503
504         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
505         if (!port) {
506                 pr_err("Unable to allocate struct se_port\n");
507                 return ERR_PTR(-ENOMEM);
508         }
509         INIT_LIST_HEAD(&port->sep_alua_list);
510         INIT_LIST_HEAD(&port->sep_list);
511         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
512         spin_lock_init(&port->sep_alua_lock);
513         mutex_init(&port->sep_tg_pt_md_mutex);
514
515         spin_lock(&dev->se_port_lock);
516         if (dev->dev_port_count == 0x0000ffff) {
517                 pr_warn("Reached dev->dev_port_count =="
518                                 " 0x0000ffff\n");
519                 spin_unlock(&dev->se_port_lock);
520                 return ERR_PTR(-ENOSPC);
521         }
522 again:
523         /*
524          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
525          * Here is the table from spc4r17 section 7.7.3.8.
526          *
527          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
528          *
529          * Code      Description
530          * 0h        Reserved
531          * 1h        Relative port 1, historically known as port A
532          * 2h        Relative port 2, historically known as port B
533          * 3h to FFFFh    Relative port 3 through 65 535
534          */
535         port->sep_rtpi = dev->dev_rpti_counter++;
536         if (!port->sep_rtpi)
537                 goto again;
538
539         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
540                 /*
541                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
542                  * for 16-bit wrap..
543                  */
544                 if (port->sep_rtpi == port_tmp->sep_rtpi)
545                         goto again;
546         }
547         spin_unlock(&dev->se_port_lock);
548
549         return port;
550 }
551
552 static void core_export_port(
553         struct se_device *dev,
554         struct se_portal_group *tpg,
555         struct se_port *port,
556         struct se_lun *lun)
557 {
558         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
559         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
560
561         spin_lock(&dev->se_port_lock);
562         spin_lock(&lun->lun_sep_lock);
563         port->sep_tpg = tpg;
564         port->sep_lun = lun;
565         lun->lun_sep = port;
566         spin_unlock(&lun->lun_sep_lock);
567
568         list_add_tail(&port->sep_list, &dev->dev_sep_list);
569         spin_unlock(&dev->se_port_lock);
570
571         if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
572                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
573                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
574                         pr_err("Unable to allocate t10_alua_tg_pt"
575                                         "_gp_member_t\n");
576                         return;
577                 }
578                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
579                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
580                         su_dev->t10_alua.default_tg_pt_gp);
581                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
582                 pr_debug("%s/%s: Adding to default ALUA Target Port"
583                         " Group: alua/default_tg_pt_gp\n",
584                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
585         }
586
587         dev->dev_port_count++;
588         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
589 }
590
591 /*
592  *      Called with struct se_device->se_port_lock spinlock held.
593  */
594 static void core_release_port(struct se_device *dev, struct se_port *port)
595         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
596 {
597         /*
598          * Wait for any port reference for PR ALL_TG_PT=1 operation
599          * to complete in __core_scsi3_alloc_registration()
600          */
601         spin_unlock(&dev->se_port_lock);
602         if (atomic_read(&port->sep_tg_pt_ref_cnt))
603                 cpu_relax();
604         spin_lock(&dev->se_port_lock);
605
606         core_alua_free_tg_pt_gp_mem(port);
607
608         list_del(&port->sep_list);
609         dev->dev_port_count--;
610         kfree(port);
611 }
612
613 int core_dev_export(
614         struct se_device *dev,
615         struct se_portal_group *tpg,
616         struct se_lun *lun)
617 {
618         struct se_port *port;
619
620         port = core_alloc_port(dev);
621         if (IS_ERR(port))
622                 return PTR_ERR(port);
623
624         lun->lun_se_dev = dev;
625         se_dev_start(dev);
626
627         atomic_inc(&dev->dev_export_obj.obj_access_count);
628         core_export_port(dev, tpg, port, lun);
629         return 0;
630 }
631
632 void core_dev_unexport(
633         struct se_device *dev,
634         struct se_portal_group *tpg,
635         struct se_lun *lun)
636 {
637         struct se_port *port = lun->lun_sep;
638
639         spin_lock(&lun->lun_sep_lock);
640         if (lun->lun_se_dev == NULL) {
641                 spin_unlock(&lun->lun_sep_lock);
642                 return;
643         }
644         spin_unlock(&lun->lun_sep_lock);
645
646         spin_lock(&dev->se_port_lock);
647         atomic_dec(&dev->dev_export_obj.obj_access_count);
648         core_release_port(dev, port);
649         spin_unlock(&dev->se_port_lock);
650
651         se_dev_stop(dev);
652         lun->lun_se_dev = NULL;
653 }
654
655 int transport_core_report_lun_response(struct se_cmd *se_cmd)
656 {
657         struct se_dev_entry *deve;
658         struct se_lun *se_lun;
659         struct se_session *se_sess = se_cmd->se_sess;
660         struct se_task *se_task;
661         unsigned char *buf;
662         u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
663
664         list_for_each_entry(se_task, &se_cmd->t_task_list, t_list)
665                 break;
666
667         if (!se_task) {
668                 pr_err("Unable to locate struct se_task for struct se_cmd\n");
669                 return PYX_TRANSPORT_LU_COMM_FAILURE;
670         }
671
672         buf = transport_kmap_first_data_page(se_cmd);
673
674         /*
675          * If no struct se_session pointer is present, this struct se_cmd is
676          * coming via a target_core_mod PASSTHROUGH op, and not through
677          * a $FABRIC_MOD.  In that case, report LUN=0 only.
678          */
679         if (!se_sess) {
680                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
681                 lun_count = 1;
682                 goto done;
683         }
684
685         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
686         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
687                 deve = &se_sess->se_node_acl->device_list[i];
688                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
689                         continue;
690                 se_lun = deve->se_lun;
691                 /*
692                  * We determine the correct LUN LIST LENGTH even once we
693                  * have reached the initial allocation length.
694                  * See SPC2-R20 7.19.
695                  */
696                 lun_count++;
697                 if ((cdb_offset + 8) >= se_cmd->data_length)
698                         continue;
699
700                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
701                 offset += 8;
702                 cdb_offset += 8;
703         }
704         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
705
706         /*
707          * See SPC3 r07, page 159.
708          */
709 done:
710         transport_kunmap_first_data_page(se_cmd);
711         lun_count *= 8;
712         buf[0] = ((lun_count >> 24) & 0xff);
713         buf[1] = ((lun_count >> 16) & 0xff);
714         buf[2] = ((lun_count >> 8) & 0xff);
715         buf[3] = (lun_count & 0xff);
716
717         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
718 }
719
720 /*      se_release_device_for_hba():
721  *
722  *
723  */
724 void se_release_device_for_hba(struct se_device *dev)
725 {
726         struct se_hba *hba = dev->se_hba;
727
728         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
729             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
730             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
731             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
732             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
733                 se_dev_stop(dev);
734
735         if (dev->dev_ptr) {
736                 kthread_stop(dev->process_thread);
737                 if (dev->transport->free_device)
738                         dev->transport->free_device(dev->dev_ptr);
739         }
740
741         spin_lock(&hba->device_lock);
742         list_del(&dev->dev_list);
743         hba->dev_count--;
744         spin_unlock(&hba->device_lock);
745
746         core_scsi3_free_all_registrations(dev);
747         se_release_vpd_for_dev(dev);
748
749         kfree(dev);
750 }
751
752 void se_release_vpd_for_dev(struct se_device *dev)
753 {
754         struct t10_vpd *vpd, *vpd_tmp;
755
756         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
757         list_for_each_entry_safe(vpd, vpd_tmp,
758                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
759                 list_del(&vpd->vpd_list);
760                 kfree(vpd);
761         }
762         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
763 }
764
765 /*      se_free_virtual_device():
766  *
767  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
768  */
769 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
770 {
771         if (!list_empty(&dev->dev_sep_list))
772                 dump_stack();
773
774         core_alua_free_lu_gp_mem(dev);
775         se_release_device_for_hba(dev);
776
777         return 0;
778 }
779
780 static void se_dev_start(struct se_device *dev)
781 {
782         struct se_hba *hba = dev->se_hba;
783
784         spin_lock(&hba->device_lock);
785         atomic_inc(&dev->dev_obj.obj_access_count);
786         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
787                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
788                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
789                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
790                 } else if (dev->dev_status &
791                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
792                         dev->dev_status &=
793                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
794                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
795                 }
796         }
797         spin_unlock(&hba->device_lock);
798 }
799
800 static void se_dev_stop(struct se_device *dev)
801 {
802         struct se_hba *hba = dev->se_hba;
803
804         spin_lock(&hba->device_lock);
805         atomic_dec(&dev->dev_obj.obj_access_count);
806         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
807                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
808                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
809                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
810                 } else if (dev->dev_status &
811                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
812                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
813                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
814                 }
815         }
816         spin_unlock(&hba->device_lock);
817 }
818
819 int se_dev_check_online(struct se_device *dev)
820 {
821         unsigned long flags;
822         int ret;
823
824         spin_lock_irqsave(&dev->dev_status_lock, flags);
825         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
826                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
827         spin_unlock_irqrestore(&dev->dev_status_lock, flags);
828
829         return ret;
830 }
831
832 int se_dev_check_shutdown(struct se_device *dev)
833 {
834         int ret;
835
836         spin_lock_irq(&dev->dev_status_lock);
837         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
838         spin_unlock_irq(&dev->dev_status_lock);
839
840         return ret;
841 }
842
843 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
844 {
845         u32 tmp, aligned_max_sectors;
846         /*
847          * Limit max_sectors to a PAGE_SIZE aligned value for modern
848          * transport_allocate_data_tasks() operation.
849          */
850         tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
851         aligned_max_sectors = (tmp / block_size);
852         if (max_sectors != aligned_max_sectors) {
853                 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
854                                 " to %u\n", max_sectors, aligned_max_sectors);
855                 return aligned_max_sectors;
856         }
857
858         return max_sectors;
859 }
860
861 void se_dev_set_default_attribs(
862         struct se_device *dev,
863         struct se_dev_limits *dev_limits)
864 {
865         struct queue_limits *limits = &dev_limits->limits;
866
867         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
868         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
869         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
870         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
871         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
872         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
873         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
874         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
875         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
876         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
877         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
878         dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
879         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
880         /*
881          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
882          * iblock_create_virtdevice() from struct queue_limits values
883          * if blk_queue_discard()==1
884          */
885         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
886         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
887                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
888         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
889         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
890                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
891         /*
892          * block_size is based on subsystem plugin dependent requirements.
893          */
894         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
895         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
896         /*
897          * max_sectors is based on subsystem plugin dependent requirements.
898          */
899         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
900         /*
901          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
902          */
903         limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
904                                                 limits->logical_block_size);
905         dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
906         /*
907          * Set optimal_sectors from max_sectors, which can be lowered via
908          * configfs.
909          */
910         dev->se_sub_dev->se_dev_attrib.optimal_sectors = limits->max_sectors;
911         /*
912          * queue_depth is based on subsystem plugin dependent requirements.
913          */
914         dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
915         dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
916 }
917
918 int se_dev_set_max_unmap_lba_count(
919         struct se_device *dev,
920         u32 max_unmap_lba_count)
921 {
922         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
923         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
924                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
925         return 0;
926 }
927
928 int se_dev_set_max_unmap_block_desc_count(
929         struct se_device *dev,
930         u32 max_unmap_block_desc_count)
931 {
932         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
933                 max_unmap_block_desc_count;
934         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
935                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
936         return 0;
937 }
938
939 int se_dev_set_unmap_granularity(
940         struct se_device *dev,
941         u32 unmap_granularity)
942 {
943         dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
944         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
945                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
946         return 0;
947 }
948
949 int se_dev_set_unmap_granularity_alignment(
950         struct se_device *dev,
951         u32 unmap_granularity_alignment)
952 {
953         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
954         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
955                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
956         return 0;
957 }
958
959 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
960 {
961         if (flag != 0 && flag != 1) {
962                 pr_err("Illegal value %d\n", flag);
963                 return -EINVAL;
964         }
965
966         pr_err("dpo_emulated not supported\n");
967         return -EINVAL;
968 }
969
970 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
971 {
972         if (flag != 0 && flag != 1) {
973                 pr_err("Illegal value %d\n", flag);
974                 return -EINVAL;
975         }
976
977         if (dev->transport->fua_write_emulated == 0) {
978                 pr_err("fua_write_emulated not supported\n");
979                 return -EINVAL;
980         }
981         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
982         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
983                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
984         return 0;
985 }
986
987 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
988 {
989         if (flag != 0 && flag != 1) {
990                 pr_err("Illegal value %d\n", flag);
991                 return -EINVAL;
992         }
993
994         pr_err("ua read emulated not supported\n");
995         return -EINVAL;
996 }
997
998 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
999 {
1000         if (flag != 0 && flag != 1) {
1001                 pr_err("Illegal value %d\n", flag);
1002                 return -EINVAL;
1003         }
1004         if (dev->transport->write_cache_emulated == 0) {
1005                 pr_err("write_cache_emulated not supported\n");
1006                 return -EINVAL;
1007         }
1008         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1009         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1010                         dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1011         return 0;
1012 }
1013
1014 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1015 {
1016         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1017                 pr_err("Illegal value %d\n", flag);
1018                 return -EINVAL;
1019         }
1020
1021         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1022                 pr_err("dev[%p]: Unable to change SE Device"
1023                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1024                         " exists\n", dev,
1025                         atomic_read(&dev->dev_export_obj.obj_access_count));
1026                 return -EINVAL;
1027         }
1028         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1029         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1030                 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1031
1032         return 0;
1033 }
1034
1035 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1036 {
1037         if ((flag != 0) && (flag != 1)) {
1038                 pr_err("Illegal value %d\n", flag);
1039                 return -EINVAL;
1040         }
1041
1042         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1043                 pr_err("dev[%p]: Unable to change SE Device TAS while"
1044                         " dev_export_obj: %d count exists\n", dev,
1045                         atomic_read(&dev->dev_export_obj.obj_access_count));
1046                 return -EINVAL;
1047         }
1048         dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1049         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1050                 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1051
1052         return 0;
1053 }
1054
1055 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1056 {
1057         if ((flag != 0) && (flag != 1)) {
1058                 pr_err("Illegal value %d\n", flag);
1059                 return -EINVAL;
1060         }
1061         /*
1062          * We expect this value to be non-zero when generic Block Layer
1063          * Discard supported is detected iblock_create_virtdevice().
1064          */
1065         if (!dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1066                 pr_err("Generic Block Discard not supported\n");
1067                 return -ENOSYS;
1068         }
1069
1070         dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1071         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1072                                 dev, flag);
1073         return 0;
1074 }
1075
1076 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1077 {
1078         if ((flag != 0) && (flag != 1)) {
1079                 pr_err("Illegal value %d\n", flag);
1080                 return -EINVAL;
1081         }
1082         /*
1083          * We expect this value to be non-zero when generic Block Layer
1084          * Discard supported is detected iblock_create_virtdevice().
1085          */
1086         if (!dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1087                 pr_err("Generic Block Discard not supported\n");
1088                 return -ENOSYS;
1089         }
1090
1091         dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1092         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1093                                 dev, flag);
1094         return 0;
1095 }
1096
1097 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1098 {
1099         if ((flag != 0) && (flag != 1)) {
1100                 pr_err("Illegal value %d\n", flag);
1101                 return -EINVAL;
1102         }
1103         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1104         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1105                 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1106         return 0;
1107 }
1108
1109 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1110 {
1111         if ((flag != 0) && (flag != 1)) {
1112                 printk(KERN_ERR "Illegal value %d\n", flag);
1113                 return -EINVAL;
1114         }
1115         dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1116         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1117                dev, flag);
1118         return 0;
1119 }
1120
1121 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1122 {
1123         if (flag != 0) {
1124                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1125                         " reordering not implemented\n", dev);
1126                 return -ENOSYS;
1127         }
1128         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1129         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1130         return 0;
1131 }
1132
1133 /*
1134  * Note, this can only be called on unexported SE Device Object.
1135  */
1136 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1137 {
1138         u32 orig_queue_depth = dev->queue_depth;
1139
1140         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1141                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1142                         " dev_export_obj: %d count exists\n", dev,
1143                         atomic_read(&dev->dev_export_obj.obj_access_count));
1144                 return -EINVAL;
1145         }
1146         if (!queue_depth) {
1147                 pr_err("dev[%p]: Illegal ZERO value for queue"
1148                         "_depth\n", dev);
1149                 return -EINVAL;
1150         }
1151
1152         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1153                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1154                         pr_err("dev[%p]: Passed queue_depth: %u"
1155                                 " exceeds TCM/SE_Device TCQ: %u\n",
1156                                 dev, queue_depth,
1157                                 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1158                         return -EINVAL;
1159                 }
1160         } else {
1161                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1162                         if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1163                                 pr_err("dev[%p]: Passed queue_depth:"
1164                                         " %u exceeds TCM/SE_Device MAX"
1165                                         " TCQ: %u\n", dev, queue_depth,
1166                                         dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1167                                 return -EINVAL;
1168                         }
1169                 }
1170         }
1171
1172         dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1173         if (queue_depth > orig_queue_depth)
1174                 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1175         else if (queue_depth < orig_queue_depth)
1176                 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1177
1178         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1179                         dev, queue_depth);
1180         return 0;
1181 }
1182
1183 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1184 {
1185         int force = 0; /* Force setting for VDEVS */
1186
1187         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1188                 pr_err("dev[%p]: Unable to change SE Device"
1189                         " max_sectors while dev_export_obj: %d count exists\n",
1190                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1191                 return -EINVAL;
1192         }
1193         if (!max_sectors) {
1194                 pr_err("dev[%p]: Illegal ZERO value for"
1195                         " max_sectors\n", dev);
1196                 return -EINVAL;
1197         }
1198         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1199                 pr_err("dev[%p]: Passed max_sectors: %u less than"
1200                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1201                                 DA_STATUS_MAX_SECTORS_MIN);
1202                 return -EINVAL;
1203         }
1204         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1205                 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1206                         pr_err("dev[%p]: Passed max_sectors: %u"
1207                                 " greater than TCM/SE_Device max_sectors:"
1208                                 " %u\n", dev, max_sectors,
1209                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1210                          return -EINVAL;
1211                 }
1212         } else {
1213                 if (!force && (max_sectors >
1214                                  dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1215                         pr_err("dev[%p]: Passed max_sectors: %u"
1216                                 " greater than TCM/SE_Device max_sectors"
1217                                 ": %u, use force=1 to override.\n", dev,
1218                                 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1219                         return -EINVAL;
1220                 }
1221                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1222                         pr_err("dev[%p]: Passed max_sectors: %u"
1223                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1224                                 " %u\n", dev, max_sectors,
1225                                 DA_STATUS_MAX_SECTORS_MAX);
1226                         return -EINVAL;
1227                 }
1228         }
1229         /*
1230          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1231          */
1232         max_sectors = se_dev_align_max_sectors(max_sectors,
1233                                 dev->se_sub_dev->se_dev_attrib.block_size);
1234
1235         dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1236         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1237                         dev, max_sectors);
1238         return 0;
1239 }
1240
1241 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1242 {
1243         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1244                 pr_err("dev[%p]: Unable to change SE Device"
1245                         " optimal_sectors while dev_export_obj: %d count exists\n",
1246                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1247                 return -EINVAL;
1248         }
1249         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1250                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1251                                 " changed for TCM/pSCSI\n", dev);
1252                 return -EINVAL;
1253         }
1254         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
1255                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1256                         " greater than max_sectors: %u\n", dev,
1257                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
1258                 return -EINVAL;
1259         }
1260
1261         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1262         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1263                         dev, optimal_sectors);
1264         return 0;
1265 }
1266
1267 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1268 {
1269         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1270                 pr_err("dev[%p]: Unable to change SE Device block_size"
1271                         " while dev_export_obj: %d count exists\n", dev,
1272                         atomic_read(&dev->dev_export_obj.obj_access_count));
1273                 return -EINVAL;
1274         }
1275
1276         if ((block_size != 512) &&
1277             (block_size != 1024) &&
1278             (block_size != 2048) &&
1279             (block_size != 4096)) {
1280                 pr_err("dev[%p]: Illegal value for block_device: %u"
1281                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1282                         dev, block_size);
1283                 return -EINVAL;
1284         }
1285
1286         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1287                 pr_err("dev[%p]: Not allowed to change block_size for"
1288                         " Physical Device, use for Linux/SCSI to change"
1289                         " block_size for underlying hardware\n", dev);
1290                 return -EINVAL;
1291         }
1292
1293         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1294         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1295                         dev, block_size);
1296         return 0;
1297 }
1298
1299 struct se_lun *core_dev_add_lun(
1300         struct se_portal_group *tpg,
1301         struct se_hba *hba,
1302         struct se_device *dev,
1303         u32 lun)
1304 {
1305         struct se_lun *lun_p;
1306         u32 lun_access = 0;
1307
1308         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1309                 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1310                         atomic_read(&dev->dev_access_obj.obj_access_count));
1311                 return NULL;
1312         }
1313
1314         lun_p = core_tpg_pre_addlun(tpg, lun);
1315         if ((IS_ERR(lun_p)) || !lun_p)
1316                 return NULL;
1317
1318         if (dev->dev_flags & DF_READ_ONLY)
1319                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1320         else
1321                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1322
1323         if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1324                 return NULL;
1325
1326         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1327                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1328                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1329                 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1330         /*
1331          * Update LUN maps for dynamically added initiators when
1332          * generate_node_acl is enabled.
1333          */
1334         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1335                 struct se_node_acl *acl;
1336                 spin_lock_irq(&tpg->acl_node_lock);
1337                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1338                         if (acl->dynamic_node_acl &&
1339                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1340                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1341                                 spin_unlock_irq(&tpg->acl_node_lock);
1342                                 core_tpg_add_node_to_devs(acl, tpg);
1343                                 spin_lock_irq(&tpg->acl_node_lock);
1344                         }
1345                 }
1346                 spin_unlock_irq(&tpg->acl_node_lock);
1347         }
1348
1349         return lun_p;
1350 }
1351
1352 /*      core_dev_del_lun():
1353  *
1354  *
1355  */
1356 int core_dev_del_lun(
1357         struct se_portal_group *tpg,
1358         u32 unpacked_lun)
1359 {
1360         struct se_lun *lun;
1361         int ret = 0;
1362
1363         lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1364         if (!lun)
1365                 return ret;
1366
1367         core_tpg_post_dellun(tpg, lun);
1368
1369         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1370                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1371                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1372                 tpg->se_tpg_tfo->get_fabric_name());
1373
1374         return 0;
1375 }
1376
1377 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1378 {
1379         struct se_lun *lun;
1380
1381         spin_lock(&tpg->tpg_lun_lock);
1382         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1383                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1384                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1385                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1386                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1387                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1388                 spin_unlock(&tpg->tpg_lun_lock);
1389                 return NULL;
1390         }
1391         lun = &tpg->tpg_lun_list[unpacked_lun];
1392
1393         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1394                 pr_err("%s Logical Unit Number: %u is not free on"
1395                         " Target Portal Group: %hu, ignoring request.\n",
1396                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1397                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1398                 spin_unlock(&tpg->tpg_lun_lock);
1399                 return NULL;
1400         }
1401         spin_unlock(&tpg->tpg_lun_lock);
1402
1403         return lun;
1404 }
1405
1406 /*      core_dev_get_lun():
1407  *
1408  *
1409  */
1410 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1411 {
1412         struct se_lun *lun;
1413
1414         spin_lock(&tpg->tpg_lun_lock);
1415         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1416                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1417                         "_TPG-1: %u for Target Portal Group: %hu\n",
1418                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1419                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1420                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1421                 spin_unlock(&tpg->tpg_lun_lock);
1422                 return NULL;
1423         }
1424         lun = &tpg->tpg_lun_list[unpacked_lun];
1425
1426         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1427                 pr_err("%s Logical Unit Number: %u is not active on"
1428                         " Target Portal Group: %hu, ignoring request.\n",
1429                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1430                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1431                 spin_unlock(&tpg->tpg_lun_lock);
1432                 return NULL;
1433         }
1434         spin_unlock(&tpg->tpg_lun_lock);
1435
1436         return lun;
1437 }
1438
1439 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1440         struct se_portal_group *tpg,
1441         u32 mapped_lun,
1442         char *initiatorname,
1443         int *ret)
1444 {
1445         struct se_lun_acl *lacl;
1446         struct se_node_acl *nacl;
1447
1448         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1449                 pr_err("%s InitiatorName exceeds maximum size.\n",
1450                         tpg->se_tpg_tfo->get_fabric_name());
1451                 *ret = -EOVERFLOW;
1452                 return NULL;
1453         }
1454         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1455         if (!nacl) {
1456                 *ret = -EINVAL;
1457                 return NULL;
1458         }
1459         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1460         if (!lacl) {
1461                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1462                 *ret = -ENOMEM;
1463                 return NULL;
1464         }
1465
1466         INIT_LIST_HEAD(&lacl->lacl_list);
1467         lacl->mapped_lun = mapped_lun;
1468         lacl->se_lun_nacl = nacl;
1469         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1470
1471         return lacl;
1472 }
1473
1474 int core_dev_add_initiator_node_lun_acl(
1475         struct se_portal_group *tpg,
1476         struct se_lun_acl *lacl,
1477         u32 unpacked_lun,
1478         u32 lun_access)
1479 {
1480         struct se_lun *lun;
1481         struct se_node_acl *nacl;
1482
1483         lun = core_dev_get_lun(tpg, unpacked_lun);
1484         if (!lun) {
1485                 pr_err("%s Logical Unit Number: %u is not active on"
1486                         " Target Portal Group: %hu, ignoring request.\n",
1487                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1488                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1489                 return -EINVAL;
1490         }
1491
1492         nacl = lacl->se_lun_nacl;
1493         if (!nacl)
1494                 return -EINVAL;
1495
1496         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1497             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1498                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1499
1500         lacl->se_lun = lun;
1501
1502         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1503                         lun_access, nacl, tpg, 1) < 0)
1504                 return -EINVAL;
1505
1506         spin_lock(&lun->lun_acl_lock);
1507         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1508         atomic_inc(&lun->lun_acl_count);
1509         smp_mb__after_atomic_inc();
1510         spin_unlock(&lun->lun_acl_lock);
1511
1512         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1513                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1514                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1515                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1516                 lacl->initiatorname);
1517         /*
1518          * Check to see if there are any existing persistent reservation APTPL
1519          * pre-registrations that need to be enabled for this LUN ACL..
1520          */
1521         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1522         return 0;
1523 }
1524
1525 /*      core_dev_del_initiator_node_lun_acl():
1526  *
1527  *
1528  */
1529 int core_dev_del_initiator_node_lun_acl(
1530         struct se_portal_group *tpg,
1531         struct se_lun *lun,
1532         struct se_lun_acl *lacl)
1533 {
1534         struct se_node_acl *nacl;
1535
1536         nacl = lacl->se_lun_nacl;
1537         if (!nacl)
1538                 return -EINVAL;
1539
1540         spin_lock(&lun->lun_acl_lock);
1541         list_del(&lacl->lacl_list);
1542         atomic_dec(&lun->lun_acl_count);
1543         smp_mb__after_atomic_dec();
1544         spin_unlock(&lun->lun_acl_lock);
1545
1546         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1547                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1548
1549         lacl->se_lun = NULL;
1550
1551         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1552                 " InitiatorNode: %s Mapped LUN: %u\n",
1553                 tpg->se_tpg_tfo->get_fabric_name(),
1554                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1555                 lacl->initiatorname, lacl->mapped_lun);
1556
1557         return 0;
1558 }
1559
1560 void core_dev_free_initiator_node_lun_acl(
1561         struct se_portal_group *tpg,
1562         struct se_lun_acl *lacl)
1563 {
1564         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1565                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1566                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1567                 tpg->se_tpg_tfo->get_fabric_name(),
1568                 lacl->initiatorname, lacl->mapped_lun);
1569
1570         kfree(lacl);
1571 }
1572
1573 int core_dev_setup_virtual_lun0(void)
1574 {
1575         struct se_hba *hba;
1576         struct se_device *dev;
1577         struct se_subsystem_dev *se_dev = NULL;
1578         struct se_subsystem_api *t;
1579         char buf[16];
1580         int ret;
1581
1582         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1583         if (IS_ERR(hba))
1584                 return PTR_ERR(hba);
1585
1586         lun0_hba = hba;
1587         t = hba->transport;
1588
1589         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1590         if (!se_dev) {
1591                 pr_err("Unable to allocate memory for"
1592                                 " struct se_subsystem_dev\n");
1593                 ret = -ENOMEM;
1594                 goto out;
1595         }
1596         INIT_LIST_HEAD(&se_dev->se_dev_node);
1597         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1598         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1599         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1600         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1601         spin_lock_init(&se_dev->t10_pr.registration_lock);
1602         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1603         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1604         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1605         spin_lock_init(&se_dev->se_dev_lock);
1606         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1607         se_dev->t10_wwn.t10_sub_dev = se_dev;
1608         se_dev->t10_alua.t10_sub_dev = se_dev;
1609         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1610         se_dev->se_dev_hba = hba;
1611
1612         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1613         if (!se_dev->se_dev_su_ptr) {
1614                 pr_err("Unable to locate subsystem dependent pointer"
1615                         " from allocate_virtdevice()\n");
1616                 ret = -ENOMEM;
1617                 goto out;
1618         }
1619         lun0_su_dev = se_dev;
1620
1621         memset(buf, 0, 16);
1622         sprintf(buf, "rd_pages=8");
1623         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1624
1625         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1626         if (IS_ERR(dev)) {
1627                 ret = PTR_ERR(dev);
1628                 goto out;
1629         }
1630         se_dev->se_dev_ptr = dev;
1631         g_lun0_dev = dev;
1632
1633         return 0;
1634 out:
1635         lun0_su_dev = NULL;
1636         kfree(se_dev);
1637         if (lun0_hba) {
1638                 core_delete_hba(lun0_hba);
1639                 lun0_hba = NULL;
1640         }
1641         return ret;
1642 }
1643
1644
1645 void core_dev_release_virtual_lun0(void)
1646 {
1647         struct se_hba *hba = lun0_hba;
1648         struct se_subsystem_dev *su_dev = lun0_su_dev;
1649
1650         if (!hba)
1651                 return;
1652
1653         if (g_lun0_dev)
1654                 se_free_virtual_device(g_lun0_dev, hba);
1655
1656         kfree(su_dev);
1657         core_delete_hba(hba);
1658 }