target: clean up the backend interface to caching parameters
[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 <net/sock.h>
39 #include <net/tcp.h>
40 #include <scsi/scsi.h>
41 #include <scsi/scsi_device.h>
42
43 #include <target/target_core_base.h>
44 #include <target/target_core_device.h>
45 #include <target/target_core_tpg.h>
46 #include <target/target_core_transport.h>
47 #include <target/target_core_fabric_ops.h>
48
49 #include "target_core_alua.h"
50 #include "target_core_hba.h"
51 #include "target_core_pr.h"
52 #include "target_core_ua.h"
53
54 static void se_dev_start(struct se_device *dev);
55 static void se_dev_stop(struct se_device *dev);
56
57 static struct se_hba *lun0_hba;
58 static struct se_subsystem_dev *lun0_su_dev;
59 /* not static, needed by tpg.c */
60 struct se_device *g_lun0_dev;
61
62 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
63 {
64         struct se_lun *se_lun = NULL;
65         struct se_session *se_sess = se_cmd->se_sess;
66         struct se_device *dev;
67         unsigned long flags;
68
69         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
70                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
71                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
72                 return -ENODEV;
73         }
74
75         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
76         se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
77         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
78                 struct se_dev_entry *deve = se_cmd->se_deve;
79
80                 deve->total_cmds++;
81                 deve->total_bytes += se_cmd->data_length;
82
83                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
84                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
85                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
86                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
87                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
88                                 " Access for 0x%08x\n",
89                                 se_cmd->se_tfo->get_fabric_name(),
90                                 unpacked_lun);
91                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
92                         return -EACCES;
93                 }
94
95                 if (se_cmd->data_direction == DMA_TO_DEVICE)
96                         deve->write_bytes += se_cmd->data_length;
97                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
98                         deve->read_bytes += se_cmd->data_length;
99
100                 deve->deve_cmds++;
101
102                 se_lun = deve->se_lun;
103                 se_cmd->se_lun = deve->se_lun;
104                 se_cmd->pr_res_key = deve->pr_res_key;
105                 se_cmd->orig_fe_lun = unpacked_lun;
106                 se_cmd->se_orig_obj_ptr = se_cmd->se_lun->lun_se_dev;
107                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
108         }
109         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
110
111         if (!se_lun) {
112                 /*
113                  * Use the se_portal_group->tpg_virt_lun0 to allow for
114                  * REPORT_LUNS, et al to be returned when no active
115                  * MappedLUN=0 exists for this Initiator Port.
116                  */
117                 if (unpacked_lun != 0) {
118                         se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
119                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
120                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
121                                 " Access for 0x%08x\n",
122                                 se_cmd->se_tfo->get_fabric_name(),
123                                 unpacked_lun);
124                         return -ENODEV;
125                 }
126                 /*
127                  * Force WRITE PROTECT for virtual LUN 0
128                  */
129                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
130                     (se_cmd->data_direction != DMA_NONE)) {
131                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
132                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
133                         return -EACCES;
134                 }
135
136                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
137                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
138                 se_cmd->orig_fe_lun = 0;
139                 se_cmd->se_orig_obj_ptr = se_cmd->se_lun->lun_se_dev;
140                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
141         }
142         /*
143          * Determine if the struct se_lun is online.
144          * FIXME: Check for LUN_RESET + UNIT Attention
145          */
146         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
147                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
148                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
149                 return -ENODEV;
150         }
151
152         /* Directly associate cmd with se_dev */
153         se_cmd->se_dev = se_lun->lun_se_dev;
154
155         /* TODO: get rid of this and use atomics for stats */
156         dev = se_lun->lun_se_dev;
157         spin_lock_irqsave(&dev->stats_lock, flags);
158         dev->num_cmds++;
159         if (se_cmd->data_direction == DMA_TO_DEVICE)
160                 dev->write_bytes += se_cmd->data_length;
161         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
162                 dev->read_bytes += se_cmd->data_length;
163         spin_unlock_irqrestore(&dev->stats_lock, flags);
164
165         /*
166          * Add the iscsi_cmd_t to the struct se_lun's cmd list.  This list is used
167          * for tracking state of struct se_cmds during LUN shutdown events.
168          */
169         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
170         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
171         atomic_set(&se_cmd->transport_lun_active, 1);
172         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
173
174         return 0;
175 }
176 EXPORT_SYMBOL(transport_lookup_cmd_lun);
177
178 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
179 {
180         struct se_dev_entry *deve;
181         struct se_lun *se_lun = NULL;
182         struct se_session *se_sess = se_cmd->se_sess;
183         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
184         unsigned long flags;
185
186         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
187                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
188                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
189                 return -ENODEV;
190         }
191
192         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
193         se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
194         deve = se_cmd->se_deve;
195
196         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
197                 se_tmr->tmr_lun = deve->se_lun;
198                 se_cmd->se_lun = deve->se_lun;
199                 se_lun = deve->se_lun;
200                 se_cmd->pr_res_key = deve->pr_res_key;
201                 se_cmd->orig_fe_lun = unpacked_lun;
202                 se_cmd->se_orig_obj_ptr = se_cmd->se_dev;
203         }
204         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
205
206         if (!se_lun) {
207                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
208                         " Access for 0x%08x\n",
209                         se_cmd->se_tfo->get_fabric_name(),
210                         unpacked_lun);
211                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
212                 return -ENODEV;
213         }
214         /*
215          * Determine if the struct se_lun is online.
216          * FIXME: Check for LUN_RESET + UNIT Attention
217          */
218         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
219                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
220                 return -ENODEV;
221         }
222
223         /* Directly associate cmd with se_dev */
224         se_cmd->se_dev = se_lun->lun_se_dev;
225         se_tmr->tmr_dev = se_lun->lun_se_dev;
226
227         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
228         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
229         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
230
231         return 0;
232 }
233 EXPORT_SYMBOL(transport_lookup_tmr_lun);
234
235 /*
236  * This function is called from core_scsi3_emulate_pro_register_and_move()
237  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
238  * when a matching rtpi is found.
239  */
240 struct se_dev_entry *core_get_se_deve_from_rtpi(
241         struct se_node_acl *nacl,
242         u16 rtpi)
243 {
244         struct se_dev_entry *deve;
245         struct se_lun *lun;
246         struct se_port *port;
247         struct se_portal_group *tpg = nacl->se_tpg;
248         u32 i;
249
250         spin_lock_irq(&nacl->device_list_lock);
251         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
252                 deve = &nacl->device_list[i];
253
254                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
255                         continue;
256
257                 lun = deve->se_lun;
258                 if (!lun) {
259                         pr_err("%s device entries device pointer is"
260                                 " NULL, but Initiator has access.\n",
261                                 tpg->se_tpg_tfo->get_fabric_name());
262                         continue;
263                 }
264                 port = lun->lun_sep;
265                 if (!port) {
266                         pr_err("%s device entries device pointer is"
267                                 " NULL, but Initiator has access.\n",
268                                 tpg->se_tpg_tfo->get_fabric_name());
269                         continue;
270                 }
271                 if (port->sep_rtpi != rtpi)
272                         continue;
273
274                 atomic_inc(&deve->pr_ref_count);
275                 smp_mb__after_atomic_inc();
276                 spin_unlock_irq(&nacl->device_list_lock);
277
278                 return deve;
279         }
280         spin_unlock_irq(&nacl->device_list_lock);
281
282         return NULL;
283 }
284
285 int core_free_device_list_for_node(
286         struct se_node_acl *nacl,
287         struct se_portal_group *tpg)
288 {
289         struct se_dev_entry *deve;
290         struct se_lun *lun;
291         u32 i;
292
293         if (!nacl->device_list)
294                 return 0;
295
296         spin_lock_irq(&nacl->device_list_lock);
297         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
298                 deve = &nacl->device_list[i];
299
300                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
301                         continue;
302
303                 if (!deve->se_lun) {
304                         pr_err("%s device entries device pointer is"
305                                 " NULL, but Initiator has access.\n",
306                                 tpg->se_tpg_tfo->get_fabric_name());
307                         continue;
308                 }
309                 lun = deve->se_lun;
310
311                 spin_unlock_irq(&nacl->device_list_lock);
312                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
313                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
314                 spin_lock_irq(&nacl->device_list_lock);
315         }
316         spin_unlock_irq(&nacl->device_list_lock);
317
318         kfree(nacl->device_list);
319         nacl->device_list = NULL;
320
321         return 0;
322 }
323
324 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
325 {
326         struct se_dev_entry *deve;
327
328         spin_lock_irq(&se_nacl->device_list_lock);
329         deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
330         deve->deve_cmds--;
331         spin_unlock_irq(&se_nacl->device_list_lock);
332 }
333
334 void core_update_device_list_access(
335         u32 mapped_lun,
336         u32 lun_access,
337         struct se_node_acl *nacl)
338 {
339         struct se_dev_entry *deve;
340
341         spin_lock_irq(&nacl->device_list_lock);
342         deve = &nacl->device_list[mapped_lun];
343         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
344                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
345                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
346         } else {
347                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
348                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
349         }
350         spin_unlock_irq(&nacl->device_list_lock);
351 }
352
353 /*      core_update_device_list_for_node():
354  *
355  *
356  */
357 int core_update_device_list_for_node(
358         struct se_lun *lun,
359         struct se_lun_acl *lun_acl,
360         u32 mapped_lun,
361         u32 lun_access,
362         struct se_node_acl *nacl,
363         struct se_portal_group *tpg,
364         int enable)
365 {
366         struct se_port *port = lun->lun_sep;
367         struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
368         int trans = 0;
369         /*
370          * If the MappedLUN entry is being disabled, the entry in
371          * port->sep_alua_list must be removed now before clearing the
372          * struct se_dev_entry pointers below as logic in
373          * core_alua_do_transition_tg_pt() depends on these being present.
374          */
375         if (!enable) {
376                 /*
377                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
378                  * that have not been explicitly concerted to MappedLUNs ->
379                  * struct se_lun_acl, but we remove deve->alua_port_list from
380                  * port->sep_alua_list. This also means that active UAs and
381                  * NodeACL context specific PR metadata for demo-mode
382                  * MappedLUN *deve will be released below..
383                  */
384                 spin_lock_bh(&port->sep_alua_lock);
385                 list_del(&deve->alua_port_list);
386                 spin_unlock_bh(&port->sep_alua_lock);
387         }
388
389         spin_lock_irq(&nacl->device_list_lock);
390         if (enable) {
391                 /*
392                  * Check if the call is handling demo mode -> explict LUN ACL
393                  * transition.  This transition must be for the same struct se_lun
394                  * + mapped_lun that was setup in demo mode..
395                  */
396                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
397                         if (deve->se_lun_acl != NULL) {
398                                 pr_err("struct se_dev_entry->se_lun_acl"
399                                         " already set for demo mode -> explict"
400                                         " LUN ACL transition\n");
401                                 spin_unlock_irq(&nacl->device_list_lock);
402                                 return -EINVAL;
403                         }
404                         if (deve->se_lun != lun) {
405                                 pr_err("struct se_dev_entry->se_lun does"
406                                         " match passed struct se_lun for demo mode"
407                                         " -> explict LUN ACL transition\n");
408                                 spin_unlock_irq(&nacl->device_list_lock);
409                                 return -EINVAL;
410                         }
411                         deve->se_lun_acl = lun_acl;
412                         trans = 1;
413                 } else {
414                         deve->se_lun = lun;
415                         deve->se_lun_acl = lun_acl;
416                         deve->mapped_lun = mapped_lun;
417                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
418                 }
419
420                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
421                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
422                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
423                 } else {
424                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
425                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
426                 }
427
428                 if (trans) {
429                         spin_unlock_irq(&nacl->device_list_lock);
430                         return 0;
431                 }
432                 deve->creation_time = get_jiffies_64();
433                 deve->attach_count++;
434                 spin_unlock_irq(&nacl->device_list_lock);
435
436                 spin_lock_bh(&port->sep_alua_lock);
437                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
438                 spin_unlock_bh(&port->sep_alua_lock);
439
440                 return 0;
441         }
442         /*
443          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
444          * PR operation to complete.
445          */
446         spin_unlock_irq(&nacl->device_list_lock);
447         while (atomic_read(&deve->pr_ref_count) != 0)
448                 cpu_relax();
449         spin_lock_irq(&nacl->device_list_lock);
450         /*
451          * Disable struct se_dev_entry LUN ACL mapping
452          */
453         core_scsi3_ua_release_all(deve);
454         deve->se_lun = NULL;
455         deve->se_lun_acl = NULL;
456         deve->lun_flags = 0;
457         deve->creation_time = 0;
458         deve->attach_count--;
459         spin_unlock_irq(&nacl->device_list_lock);
460
461         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
462         return 0;
463 }
464
465 /*      core_clear_lun_from_tpg():
466  *
467  *
468  */
469 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
470 {
471         struct se_node_acl *nacl;
472         struct se_dev_entry *deve;
473         u32 i;
474
475         spin_lock_irq(&tpg->acl_node_lock);
476         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
477                 spin_unlock_irq(&tpg->acl_node_lock);
478
479                 spin_lock_irq(&nacl->device_list_lock);
480                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
481                         deve = &nacl->device_list[i];
482                         if (lun != deve->se_lun)
483                                 continue;
484                         spin_unlock_irq(&nacl->device_list_lock);
485
486                         core_update_device_list_for_node(lun, NULL,
487                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
488                                 nacl, tpg, 0);
489
490                         spin_lock_irq(&nacl->device_list_lock);
491                 }
492                 spin_unlock_irq(&nacl->device_list_lock);
493
494                 spin_lock_irq(&tpg->acl_node_lock);
495         }
496         spin_unlock_irq(&tpg->acl_node_lock);
497 }
498
499 static struct se_port *core_alloc_port(struct se_device *dev)
500 {
501         struct se_port *port, *port_tmp;
502
503         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
504         if (!port) {
505                 pr_err("Unable to allocate struct se_port\n");
506                 return ERR_PTR(-ENOMEM);
507         }
508         INIT_LIST_HEAD(&port->sep_alua_list);
509         INIT_LIST_HEAD(&port->sep_list);
510         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
511         spin_lock_init(&port->sep_alua_lock);
512         mutex_init(&port->sep_tg_pt_md_mutex);
513
514         spin_lock(&dev->se_port_lock);
515         if (dev->dev_port_count == 0x0000ffff) {
516                 pr_warn("Reached dev->dev_port_count =="
517                                 " 0x0000ffff\n");
518                 spin_unlock(&dev->se_port_lock);
519                 return ERR_PTR(-ENOSPC);
520         }
521 again:
522         /*
523          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
524          * Here is the table from spc4r17 section 7.7.3.8.
525          *
526          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
527          *
528          * Code      Description
529          * 0h        Reserved
530          * 1h        Relative port 1, historically known as port A
531          * 2h        Relative port 2, historically known as port B
532          * 3h to FFFFh    Relative port 3 through 65 535
533          */
534         port->sep_rtpi = dev->dev_rpti_counter++;
535         if (!port->sep_rtpi)
536                 goto again;
537
538         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
539                 /*
540                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
541                  * for 16-bit wrap..
542                  */
543                 if (port->sep_rtpi == port_tmp->sep_rtpi)
544                         goto again;
545         }
546         spin_unlock(&dev->se_port_lock);
547
548         return port;
549 }
550
551 static void core_export_port(
552         struct se_device *dev,
553         struct se_portal_group *tpg,
554         struct se_port *port,
555         struct se_lun *lun)
556 {
557         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
558         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
559
560         spin_lock(&dev->se_port_lock);
561         spin_lock(&lun->lun_sep_lock);
562         port->sep_tpg = tpg;
563         port->sep_lun = lun;
564         lun->lun_sep = port;
565         spin_unlock(&lun->lun_sep_lock);
566
567         list_add_tail(&port->sep_list, &dev->dev_sep_list);
568         spin_unlock(&dev->se_port_lock);
569
570         if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
571                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
572                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
573                         pr_err("Unable to allocate t10_alua_tg_pt"
574                                         "_gp_member_t\n");
575                         return;
576                 }
577                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
578                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
579                         su_dev->t10_alua.default_tg_pt_gp);
580                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
581                 pr_debug("%s/%s: Adding to default ALUA Target Port"
582                         " Group: alua/default_tg_pt_gp\n",
583                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
584         }
585
586         dev->dev_port_count++;
587         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
588 }
589
590 /*
591  *      Called with struct se_device->se_port_lock spinlock held.
592  */
593 static void core_release_port(struct se_device *dev, struct se_port *port)
594         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
595 {
596         /*
597          * Wait for any port reference for PR ALL_TG_PT=1 operation
598          * to complete in __core_scsi3_alloc_registration()
599          */
600         spin_unlock(&dev->se_port_lock);
601         if (atomic_read(&port->sep_tg_pt_ref_cnt))
602                 cpu_relax();
603         spin_lock(&dev->se_port_lock);
604
605         core_alua_free_tg_pt_gp_mem(port);
606
607         list_del(&port->sep_list);
608         dev->dev_port_count--;
609         kfree(port);
610 }
611
612 int core_dev_export(
613         struct se_device *dev,
614         struct se_portal_group *tpg,
615         struct se_lun *lun)
616 {
617         struct se_port *port;
618
619         port = core_alloc_port(dev);
620         if (IS_ERR(port))
621                 return PTR_ERR(port);
622
623         lun->lun_se_dev = dev;
624         se_dev_start(dev);
625
626         atomic_inc(&dev->dev_export_obj.obj_access_count);
627         core_export_port(dev, tpg, port, lun);
628         return 0;
629 }
630
631 void core_dev_unexport(
632         struct se_device *dev,
633         struct se_portal_group *tpg,
634         struct se_lun *lun)
635 {
636         struct se_port *port = lun->lun_sep;
637
638         spin_lock(&lun->lun_sep_lock);
639         if (lun->lun_se_dev == NULL) {
640                 spin_unlock(&lun->lun_sep_lock);
641                 return;
642         }
643         spin_unlock(&lun->lun_sep_lock);
644
645         spin_lock(&dev->se_port_lock);
646         atomic_dec(&dev->dev_export_obj.obj_access_count);
647         core_release_port(dev, port);
648         spin_unlock(&dev->se_port_lock);
649
650         se_dev_stop(dev);
651         lun->lun_se_dev = NULL;
652 }
653
654 int transport_core_report_lun_response(struct se_cmd *se_cmd)
655 {
656         struct se_dev_entry *deve;
657         struct se_lun *se_lun;
658         struct se_session *se_sess = se_cmd->se_sess;
659         struct se_task *se_task;
660         unsigned char *buf;
661         u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
662
663         list_for_each_entry(se_task, &se_cmd->t_task_list, t_list)
664                 break;
665
666         if (!se_task) {
667                 pr_err("Unable to locate struct se_task for struct se_cmd\n");
668                 return PYX_TRANSPORT_LU_COMM_FAILURE;
669         }
670
671         buf = transport_kmap_first_data_page(se_cmd);
672
673         /*
674          * If no struct se_session pointer is present, this struct se_cmd is
675          * coming via a target_core_mod PASSTHROUGH op, and not through
676          * a $FABRIC_MOD.  In that case, report LUN=0 only.
677          */
678         if (!se_sess) {
679                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
680                 lun_count = 1;
681                 goto done;
682         }
683
684         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
685         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
686                 deve = &se_sess->se_node_acl->device_list[i];
687                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
688                         continue;
689                 se_lun = deve->se_lun;
690                 /*
691                  * We determine the correct LUN LIST LENGTH even once we
692                  * have reached the initial allocation length.
693                  * See SPC2-R20 7.19.
694                  */
695                 lun_count++;
696                 if ((cdb_offset + 8) >= se_cmd->data_length)
697                         continue;
698
699                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
700                 offset += 8;
701                 cdb_offset += 8;
702         }
703         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
704
705         /*
706          * See SPC3 r07, page 159.
707          */
708 done:
709         transport_kunmap_first_data_page(se_cmd);
710         lun_count *= 8;
711         buf[0] = ((lun_count >> 24) & 0xff);
712         buf[1] = ((lun_count >> 16) & 0xff);
713         buf[2] = ((lun_count >> 8) & 0xff);
714         buf[3] = (lun_count & 0xff);
715
716         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
717 }
718
719 /*      se_release_device_for_hba():
720  *
721  *
722  */
723 void se_release_device_for_hba(struct se_device *dev)
724 {
725         struct se_hba *hba = dev->se_hba;
726
727         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
728             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
729             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
730             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
731             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
732                 se_dev_stop(dev);
733
734         if (dev->dev_ptr) {
735                 kthread_stop(dev->process_thread);
736                 if (dev->transport->free_device)
737                         dev->transport->free_device(dev->dev_ptr);
738         }
739
740         spin_lock(&hba->device_lock);
741         list_del(&dev->dev_list);
742         hba->dev_count--;
743         spin_unlock(&hba->device_lock);
744
745         core_scsi3_free_all_registrations(dev);
746         se_release_vpd_for_dev(dev);
747
748         kfree(dev);
749 }
750
751 void se_release_vpd_for_dev(struct se_device *dev)
752 {
753         struct t10_vpd *vpd, *vpd_tmp;
754
755         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
756         list_for_each_entry_safe(vpd, vpd_tmp,
757                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
758                 list_del(&vpd->vpd_list);
759                 kfree(vpd);
760         }
761         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
762 }
763
764 /*      se_free_virtual_device():
765  *
766  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
767  */
768 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
769 {
770         if (!list_empty(&dev->dev_sep_list))
771                 dump_stack();
772
773         core_alua_free_lu_gp_mem(dev);
774         se_release_device_for_hba(dev);
775
776         return 0;
777 }
778
779 static void se_dev_start(struct se_device *dev)
780 {
781         struct se_hba *hba = dev->se_hba;
782
783         spin_lock(&hba->device_lock);
784         atomic_inc(&dev->dev_obj.obj_access_count);
785         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
786                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
787                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
788                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
789                 } else if (dev->dev_status &
790                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
791                         dev->dev_status &=
792                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
793                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
794                 }
795         }
796         spin_unlock(&hba->device_lock);
797 }
798
799 static void se_dev_stop(struct se_device *dev)
800 {
801         struct se_hba *hba = dev->se_hba;
802
803         spin_lock(&hba->device_lock);
804         atomic_dec(&dev->dev_obj.obj_access_count);
805         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
806                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
807                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
808                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
809                 } else if (dev->dev_status &
810                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
811                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
812                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
813                 }
814         }
815         spin_unlock(&hba->device_lock);
816 }
817
818 int se_dev_check_online(struct se_device *dev)
819 {
820         unsigned long flags;
821         int ret;
822
823         spin_lock_irqsave(&dev->dev_status_lock, flags);
824         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
825                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
826         spin_unlock_irqrestore(&dev->dev_status_lock, flags);
827
828         return ret;
829 }
830
831 int se_dev_check_shutdown(struct se_device *dev)
832 {
833         int ret;
834
835         spin_lock_irq(&dev->dev_status_lock);
836         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
837         spin_unlock_irq(&dev->dev_status_lock);
838
839         return ret;
840 }
841
842 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
843 {
844         u32 tmp, aligned_max_sectors;
845         /*
846          * Limit max_sectors to a PAGE_SIZE aligned value for modern
847          * transport_allocate_data_tasks() operation.
848          */
849         tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
850         aligned_max_sectors = (tmp / block_size);
851         if (max_sectors != aligned_max_sectors) {
852                 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
853                                 " to %u\n", max_sectors, aligned_max_sectors);
854                 return aligned_max_sectors;
855         }
856
857         return max_sectors;
858 }
859
860 void se_dev_set_default_attribs(
861         struct se_device *dev,
862         struct se_dev_limits *dev_limits)
863 {
864         struct queue_limits *limits = &dev_limits->limits;
865
866         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
867         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
868         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
869         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
870         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
871         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
872         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
873         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
874         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
875         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
876         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
877         dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
878         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
879         /*
880          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
881          * iblock_create_virtdevice() from struct queue_limits values
882          * if blk_queue_discard()==1
883          */
884         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
885         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
886                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
887         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
888         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
889                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
890         /*
891          * block_size is based on subsystem plugin dependent requirements.
892          */
893         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
894         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
895         /*
896          * max_sectors is based on subsystem plugin dependent requirements.
897          */
898         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
899         /*
900          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
901          */
902         limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
903                                                 limits->logical_block_size);
904         dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
905         /*
906          * Set optimal_sectors from max_sectors, which can be lowered via
907          * configfs.
908          */
909         dev->se_sub_dev->se_dev_attrib.optimal_sectors = limits->max_sectors;
910         /*
911          * queue_depth is based on subsystem plugin dependent requirements.
912          */
913         dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
914         dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
915 }
916
917 int se_dev_set_task_timeout(struct se_device *dev, u32 task_timeout)
918 {
919         if (task_timeout > DA_TASK_TIMEOUT_MAX) {
920                 pr_err("dev[%p]: Passed task_timeout: %u larger then"
921                         " DA_TASK_TIMEOUT_MAX\n", dev, task_timeout);
922                 return -EINVAL;
923         } else {
924                 dev->se_sub_dev->se_dev_attrib.task_timeout = task_timeout;
925                 pr_debug("dev[%p]: Set SE Device task_timeout: %u\n",
926                         dev, task_timeout);
927         }
928
929         return 0;
930 }
931
932 int se_dev_set_max_unmap_lba_count(
933         struct se_device *dev,
934         u32 max_unmap_lba_count)
935 {
936         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
937         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
938                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
939         return 0;
940 }
941
942 int se_dev_set_max_unmap_block_desc_count(
943         struct se_device *dev,
944         u32 max_unmap_block_desc_count)
945 {
946         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
947                 max_unmap_block_desc_count;
948         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
949                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
950         return 0;
951 }
952
953 int se_dev_set_unmap_granularity(
954         struct se_device *dev,
955         u32 unmap_granularity)
956 {
957         dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
958         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
959                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
960         return 0;
961 }
962
963 int se_dev_set_unmap_granularity_alignment(
964         struct se_device *dev,
965         u32 unmap_granularity_alignment)
966 {
967         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
968         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
969                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
970         return 0;
971 }
972
973 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
974 {
975         if (flag != 0 && flag != 1) {
976                 pr_err("Illegal value %d\n", flag);
977                 return -EINVAL;
978         }
979
980         pr_err("dpo_emulated not supported\n");
981         return -EINVAL;
982 }
983
984 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
985 {
986         if (flag != 0 && flag != 1) {
987                 pr_err("Illegal value %d\n", flag);
988                 return -EINVAL;
989         }
990
991         if (dev->transport->fua_write_emulated == 0) {
992                 pr_err("fua_write_emulated not supported\n");
993                 return -EINVAL;
994         }
995         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
996         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
997                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
998         return 0;
999 }
1000
1001 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
1002 {
1003         if (flag != 0 && flag != 1) {
1004                 pr_err("Illegal value %d\n", flag);
1005                 return -EINVAL;
1006         }
1007
1008         pr_err("ua read emulated not supported\n");
1009         return -EINVAL;
1010 }
1011
1012 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1013 {
1014         if (flag != 0 && flag != 1) {
1015                 pr_err("Illegal value %d\n", flag);
1016                 return -EINVAL;
1017         }
1018         if (dev->transport->write_cache_emulated == 0) {
1019                 pr_err("write_cache_emulated not supported\n");
1020                 return -EINVAL;
1021         }
1022         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1023         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1024                         dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1025         return 0;
1026 }
1027
1028 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1029 {
1030         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1031                 pr_err("Illegal value %d\n", flag);
1032                 return -EINVAL;
1033         }
1034
1035         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1036                 pr_err("dev[%p]: Unable to change SE Device"
1037                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1038                         " exists\n", dev,
1039                         atomic_read(&dev->dev_export_obj.obj_access_count));
1040                 return -EINVAL;
1041         }
1042         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1043         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1044                 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1045
1046         return 0;
1047 }
1048
1049 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1050 {
1051         if ((flag != 0) && (flag != 1)) {
1052                 pr_err("Illegal value %d\n", flag);
1053                 return -EINVAL;
1054         }
1055
1056         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1057                 pr_err("dev[%p]: Unable to change SE Device TAS while"
1058                         " dev_export_obj: %d count exists\n", dev,
1059                         atomic_read(&dev->dev_export_obj.obj_access_count));
1060                 return -EINVAL;
1061         }
1062         dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1063         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1064                 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1065
1066         return 0;
1067 }
1068
1069 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1070 {
1071         if ((flag != 0) && (flag != 1)) {
1072                 pr_err("Illegal value %d\n", flag);
1073                 return -EINVAL;
1074         }
1075         /*
1076          * We expect this value to be non-zero when generic Block Layer
1077          * Discard supported is detected iblock_create_virtdevice().
1078          */
1079         if (!dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1080                 pr_err("Generic Block Discard not supported\n");
1081                 return -ENOSYS;
1082         }
1083
1084         dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1085         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1086                                 dev, flag);
1087         return 0;
1088 }
1089
1090 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1091 {
1092         if ((flag != 0) && (flag != 1)) {
1093                 pr_err("Illegal value %d\n", flag);
1094                 return -EINVAL;
1095         }
1096         /*
1097          * We expect this value to be non-zero when generic Block Layer
1098          * Discard supported is detected iblock_create_virtdevice().
1099          */
1100         if (!dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1101                 pr_err("Generic Block Discard not supported\n");
1102                 return -ENOSYS;
1103         }
1104
1105         dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1106         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1107                                 dev, flag);
1108         return 0;
1109 }
1110
1111 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1112 {
1113         if ((flag != 0) && (flag != 1)) {
1114                 pr_err("Illegal value %d\n", flag);
1115                 return -EINVAL;
1116         }
1117         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1118         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1119                 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1120         return 0;
1121 }
1122
1123 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1124 {
1125         if ((flag != 0) && (flag != 1)) {
1126                 printk(KERN_ERR "Illegal value %d\n", flag);
1127                 return -EINVAL;
1128         }
1129         dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1130         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1131                dev, flag);
1132         return 0;
1133 }
1134
1135 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1136 {
1137         if (flag != 0) {
1138                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1139                         " reordering not implemented\n", dev);
1140                 return -ENOSYS;
1141         }
1142         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1143         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1144         return 0;
1145 }
1146
1147 /*
1148  * Note, this can only be called on unexported SE Device Object.
1149  */
1150 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1151 {
1152         u32 orig_queue_depth = dev->queue_depth;
1153
1154         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1155                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1156                         " dev_export_obj: %d count exists\n", dev,
1157                         atomic_read(&dev->dev_export_obj.obj_access_count));
1158                 return -EINVAL;
1159         }
1160         if (!queue_depth) {
1161                 pr_err("dev[%p]: Illegal ZERO value for queue"
1162                         "_depth\n", dev);
1163                 return -EINVAL;
1164         }
1165
1166         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1167                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1168                         pr_err("dev[%p]: Passed queue_depth: %u"
1169                                 " exceeds TCM/SE_Device TCQ: %u\n",
1170                                 dev, queue_depth,
1171                                 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1172                         return -EINVAL;
1173                 }
1174         } else {
1175                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1176                         if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1177                                 pr_err("dev[%p]: Passed queue_depth:"
1178                                         " %u exceeds TCM/SE_Device MAX"
1179                                         " TCQ: %u\n", dev, queue_depth,
1180                                         dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1181                                 return -EINVAL;
1182                         }
1183                 }
1184         }
1185
1186         dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1187         if (queue_depth > orig_queue_depth)
1188                 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1189         else if (queue_depth < orig_queue_depth)
1190                 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1191
1192         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1193                         dev, queue_depth);
1194         return 0;
1195 }
1196
1197 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1198 {
1199         int force = 0; /* Force setting for VDEVS */
1200
1201         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1202                 pr_err("dev[%p]: Unable to change SE Device"
1203                         " max_sectors while dev_export_obj: %d count exists\n",
1204                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1205                 return -EINVAL;
1206         }
1207         if (!max_sectors) {
1208                 pr_err("dev[%p]: Illegal ZERO value for"
1209                         " max_sectors\n", dev);
1210                 return -EINVAL;
1211         }
1212         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1213                 pr_err("dev[%p]: Passed max_sectors: %u less than"
1214                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1215                                 DA_STATUS_MAX_SECTORS_MIN);
1216                 return -EINVAL;
1217         }
1218         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1219                 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1220                         pr_err("dev[%p]: Passed max_sectors: %u"
1221                                 " greater than TCM/SE_Device max_sectors:"
1222                                 " %u\n", dev, max_sectors,
1223                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1224                          return -EINVAL;
1225                 }
1226         } else {
1227                 if (!force && (max_sectors >
1228                                  dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1229                         pr_err("dev[%p]: Passed max_sectors: %u"
1230                                 " greater than TCM/SE_Device max_sectors"
1231                                 ": %u, use force=1 to override.\n", dev,
1232                                 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1233                         return -EINVAL;
1234                 }
1235                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1236                         pr_err("dev[%p]: Passed max_sectors: %u"
1237                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1238                                 " %u\n", dev, max_sectors,
1239                                 DA_STATUS_MAX_SECTORS_MAX);
1240                         return -EINVAL;
1241                 }
1242         }
1243         /*
1244          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1245          */
1246         max_sectors = se_dev_align_max_sectors(max_sectors,
1247                                 dev->se_sub_dev->se_dev_attrib.block_size);
1248
1249         dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1250         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1251                         dev, max_sectors);
1252         return 0;
1253 }
1254
1255 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1256 {
1257         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1258                 pr_err("dev[%p]: Unable to change SE Device"
1259                         " optimal_sectors while dev_export_obj: %d count exists\n",
1260                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1261                 return -EINVAL;
1262         }
1263         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1264                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1265                                 " changed for TCM/pSCSI\n", dev);
1266                 return -EINVAL;
1267         }
1268         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
1269                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1270                         " greater than max_sectors: %u\n", dev,
1271                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
1272                 return -EINVAL;
1273         }
1274
1275         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1276         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1277                         dev, optimal_sectors);
1278         return 0;
1279 }
1280
1281 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1282 {
1283         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1284                 pr_err("dev[%p]: Unable to change SE Device block_size"
1285                         " while dev_export_obj: %d count exists\n", dev,
1286                         atomic_read(&dev->dev_export_obj.obj_access_count));
1287                 return -EINVAL;
1288         }
1289
1290         if ((block_size != 512) &&
1291             (block_size != 1024) &&
1292             (block_size != 2048) &&
1293             (block_size != 4096)) {
1294                 pr_err("dev[%p]: Illegal value for block_device: %u"
1295                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1296                         dev, block_size);
1297                 return -EINVAL;
1298         }
1299
1300         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1301                 pr_err("dev[%p]: Not allowed to change block_size for"
1302                         " Physical Device, use for Linux/SCSI to change"
1303                         " block_size for underlying hardware\n", dev);
1304                 return -EINVAL;
1305         }
1306
1307         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1308         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1309                         dev, block_size);
1310         return 0;
1311 }
1312
1313 struct se_lun *core_dev_add_lun(
1314         struct se_portal_group *tpg,
1315         struct se_hba *hba,
1316         struct se_device *dev,
1317         u32 lun)
1318 {
1319         struct se_lun *lun_p;
1320         u32 lun_access = 0;
1321
1322         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1323                 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1324                         atomic_read(&dev->dev_access_obj.obj_access_count));
1325                 return NULL;
1326         }
1327
1328         lun_p = core_tpg_pre_addlun(tpg, lun);
1329         if ((IS_ERR(lun_p)) || !lun_p)
1330                 return NULL;
1331
1332         if (dev->dev_flags & DF_READ_ONLY)
1333                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1334         else
1335                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1336
1337         if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1338                 return NULL;
1339
1340         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1341                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1342                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1343                 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1344         /*
1345          * Update LUN maps for dynamically added initiators when
1346          * generate_node_acl is enabled.
1347          */
1348         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1349                 struct se_node_acl *acl;
1350                 spin_lock_irq(&tpg->acl_node_lock);
1351                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1352                         if (acl->dynamic_node_acl &&
1353                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1354                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1355                                 spin_unlock_irq(&tpg->acl_node_lock);
1356                                 core_tpg_add_node_to_devs(acl, tpg);
1357                                 spin_lock_irq(&tpg->acl_node_lock);
1358                         }
1359                 }
1360                 spin_unlock_irq(&tpg->acl_node_lock);
1361         }
1362
1363         return lun_p;
1364 }
1365
1366 /*      core_dev_del_lun():
1367  *
1368  *
1369  */
1370 int core_dev_del_lun(
1371         struct se_portal_group *tpg,
1372         u32 unpacked_lun)
1373 {
1374         struct se_lun *lun;
1375         int ret = 0;
1376
1377         lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1378         if (!lun)
1379                 return ret;
1380
1381         core_tpg_post_dellun(tpg, lun);
1382
1383         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1384                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1385                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1386                 tpg->se_tpg_tfo->get_fabric_name());
1387
1388         return 0;
1389 }
1390
1391 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1392 {
1393         struct se_lun *lun;
1394
1395         spin_lock(&tpg->tpg_lun_lock);
1396         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1397                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1398                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1399                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1400                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1401                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1402                 spin_unlock(&tpg->tpg_lun_lock);
1403                 return NULL;
1404         }
1405         lun = &tpg->tpg_lun_list[unpacked_lun];
1406
1407         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1408                 pr_err("%s Logical Unit Number: %u is not free on"
1409                         " Target Portal Group: %hu, ignoring request.\n",
1410                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1411                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1412                 spin_unlock(&tpg->tpg_lun_lock);
1413                 return NULL;
1414         }
1415         spin_unlock(&tpg->tpg_lun_lock);
1416
1417         return lun;
1418 }
1419
1420 /*      core_dev_get_lun():
1421  *
1422  *
1423  */
1424 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1425 {
1426         struct se_lun *lun;
1427
1428         spin_lock(&tpg->tpg_lun_lock);
1429         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1430                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1431                         "_TPG-1: %u for Target Portal Group: %hu\n",
1432                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1433                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1434                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1435                 spin_unlock(&tpg->tpg_lun_lock);
1436                 return NULL;
1437         }
1438         lun = &tpg->tpg_lun_list[unpacked_lun];
1439
1440         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1441                 pr_err("%s Logical Unit Number: %u is not active on"
1442                         " Target Portal Group: %hu, ignoring request.\n",
1443                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1444                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1445                 spin_unlock(&tpg->tpg_lun_lock);
1446                 return NULL;
1447         }
1448         spin_unlock(&tpg->tpg_lun_lock);
1449
1450         return lun;
1451 }
1452
1453 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1454         struct se_portal_group *tpg,
1455         u32 mapped_lun,
1456         char *initiatorname,
1457         int *ret)
1458 {
1459         struct se_lun_acl *lacl;
1460         struct se_node_acl *nacl;
1461
1462         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1463                 pr_err("%s InitiatorName exceeds maximum size.\n",
1464                         tpg->se_tpg_tfo->get_fabric_name());
1465                 *ret = -EOVERFLOW;
1466                 return NULL;
1467         }
1468         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1469         if (!nacl) {
1470                 *ret = -EINVAL;
1471                 return NULL;
1472         }
1473         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1474         if (!lacl) {
1475                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1476                 *ret = -ENOMEM;
1477                 return NULL;
1478         }
1479
1480         INIT_LIST_HEAD(&lacl->lacl_list);
1481         lacl->mapped_lun = mapped_lun;
1482         lacl->se_lun_nacl = nacl;
1483         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1484
1485         return lacl;
1486 }
1487
1488 int core_dev_add_initiator_node_lun_acl(
1489         struct se_portal_group *tpg,
1490         struct se_lun_acl *lacl,
1491         u32 unpacked_lun,
1492         u32 lun_access)
1493 {
1494         struct se_lun *lun;
1495         struct se_node_acl *nacl;
1496
1497         lun = core_dev_get_lun(tpg, unpacked_lun);
1498         if (!lun) {
1499                 pr_err("%s Logical Unit Number: %u is not active on"
1500                         " Target Portal Group: %hu, ignoring request.\n",
1501                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1502                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1503                 return -EINVAL;
1504         }
1505
1506         nacl = lacl->se_lun_nacl;
1507         if (!nacl)
1508                 return -EINVAL;
1509
1510         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1511             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1512                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1513
1514         lacl->se_lun = lun;
1515
1516         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1517                         lun_access, nacl, tpg, 1) < 0)
1518                 return -EINVAL;
1519
1520         spin_lock(&lun->lun_acl_lock);
1521         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1522         atomic_inc(&lun->lun_acl_count);
1523         smp_mb__after_atomic_inc();
1524         spin_unlock(&lun->lun_acl_lock);
1525
1526         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1527                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1528                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1529                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1530                 lacl->initiatorname);
1531         /*
1532          * Check to see if there are any existing persistent reservation APTPL
1533          * pre-registrations that need to be enabled for this LUN ACL..
1534          */
1535         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1536         return 0;
1537 }
1538
1539 /*      core_dev_del_initiator_node_lun_acl():
1540  *
1541  *
1542  */
1543 int core_dev_del_initiator_node_lun_acl(
1544         struct se_portal_group *tpg,
1545         struct se_lun *lun,
1546         struct se_lun_acl *lacl)
1547 {
1548         struct se_node_acl *nacl;
1549
1550         nacl = lacl->se_lun_nacl;
1551         if (!nacl)
1552                 return -EINVAL;
1553
1554         spin_lock(&lun->lun_acl_lock);
1555         list_del(&lacl->lacl_list);
1556         atomic_dec(&lun->lun_acl_count);
1557         smp_mb__after_atomic_dec();
1558         spin_unlock(&lun->lun_acl_lock);
1559
1560         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1561                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1562
1563         lacl->se_lun = NULL;
1564
1565         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1566                 " InitiatorNode: %s Mapped LUN: %u\n",
1567                 tpg->se_tpg_tfo->get_fabric_name(),
1568                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1569                 lacl->initiatorname, lacl->mapped_lun);
1570
1571         return 0;
1572 }
1573
1574 void core_dev_free_initiator_node_lun_acl(
1575         struct se_portal_group *tpg,
1576         struct se_lun_acl *lacl)
1577 {
1578         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1579                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1580                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1581                 tpg->se_tpg_tfo->get_fabric_name(),
1582                 lacl->initiatorname, lacl->mapped_lun);
1583
1584         kfree(lacl);
1585 }
1586
1587 int core_dev_setup_virtual_lun0(void)
1588 {
1589         struct se_hba *hba;
1590         struct se_device *dev;
1591         struct se_subsystem_dev *se_dev = NULL;
1592         struct se_subsystem_api *t;
1593         char buf[16];
1594         int ret;
1595
1596         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1597         if (IS_ERR(hba))
1598                 return PTR_ERR(hba);
1599
1600         lun0_hba = hba;
1601         t = hba->transport;
1602
1603         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1604         if (!se_dev) {
1605                 pr_err("Unable to allocate memory for"
1606                                 " struct se_subsystem_dev\n");
1607                 ret = -ENOMEM;
1608                 goto out;
1609         }
1610         INIT_LIST_HEAD(&se_dev->se_dev_node);
1611         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1612         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1613         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1614         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1615         spin_lock_init(&se_dev->t10_pr.registration_lock);
1616         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1617         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1618         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1619         spin_lock_init(&se_dev->se_dev_lock);
1620         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1621         se_dev->t10_wwn.t10_sub_dev = se_dev;
1622         se_dev->t10_alua.t10_sub_dev = se_dev;
1623         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1624         se_dev->se_dev_hba = hba;
1625
1626         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1627         if (!se_dev->se_dev_su_ptr) {
1628                 pr_err("Unable to locate subsystem dependent pointer"
1629                         " from allocate_virtdevice()\n");
1630                 ret = -ENOMEM;
1631                 goto out;
1632         }
1633         lun0_su_dev = se_dev;
1634
1635         memset(buf, 0, 16);
1636         sprintf(buf, "rd_pages=8");
1637         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1638
1639         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1640         if (IS_ERR(dev)) {
1641                 ret = PTR_ERR(dev);
1642                 goto out;
1643         }
1644         se_dev->se_dev_ptr = dev;
1645         g_lun0_dev = dev;
1646
1647         return 0;
1648 out:
1649         lun0_su_dev = NULL;
1650         kfree(se_dev);
1651         if (lun0_hba) {
1652                 core_delete_hba(lun0_hba);
1653                 lun0_hba = NULL;
1654         }
1655         return ret;
1656 }
1657
1658
1659 void core_dev_release_virtual_lun0(void)
1660 {
1661         struct se_hba *hba = lun0_hba;
1662         struct se_subsystem_dev *su_dev = lun0_su_dev;
1663
1664         if (!hba)
1665                 return;
1666
1667         if (g_lun0_dev)
1668                 se_free_virtual_device(g_lun0_dev, hba);
1669
1670         kfree(su_dev);
1671         core_delete_hba(hba);
1672 }