media: tegra: enable a clock for VIP in APB MISC register
[linux-2.6.git] / drivers / target / target_core_tpg.c
1 /*******************************************************************************
2  * Filename:  target_core_tpg.c
3  *
4  * This file contains generic Target Portal Group related functions.
5  *
6  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8  * Copyright (c) 2007-2010 Rising Tide Systems
9  * Copyright (c) 2008-2010 Linux-iSCSI.org
10  *
11  * Nicholas A. Bellinger <nab@kernel.org>
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License as published by
15  * the Free Software Foundation; either version 2 of the License, or
16  * (at your option) any later version.
17  *
18  * This program is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21  * GNU General Public License for more details.
22  *
23  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, write to the Free Software
25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26  *
27  ******************************************************************************/
28
29 #include <linux/net.h>
30 #include <linux/string.h>
31 #include <linux/timer.h>
32 #include <linux/slab.h>
33 #include <linux/spinlock.h>
34 #include <linux/in.h>
35 #include <net/sock.h>
36 #include <net/tcp.h>
37 #include <scsi/scsi.h>
38 #include <scsi/scsi_cmnd.h>
39
40 #include <target/target_core_base.h>
41 #include <target/target_core_device.h>
42 #include <target/target_core_tpg.h>
43 #include <target/target_core_transport.h>
44 #include <target/target_core_fabric_ops.h>
45
46 #include "target_core_hba.h"
47 #include "target_core_stat.h"
48
49 extern struct se_device *g_lun0_dev;
50
51 static DEFINE_SPINLOCK(tpg_lock);
52 static LIST_HEAD(tpg_list);
53
54 /*      core_clear_initiator_node_from_tpg():
55  *
56  *
57  */
58 static void core_clear_initiator_node_from_tpg(
59         struct se_node_acl *nacl,
60         struct se_portal_group *tpg)
61 {
62         int i;
63         struct se_dev_entry *deve;
64         struct se_lun *lun;
65         struct se_lun_acl *acl, *acl_tmp;
66
67         spin_lock_irq(&nacl->device_list_lock);
68         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
69                 deve = &nacl->device_list[i];
70
71                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
72                         continue;
73
74                 if (!deve->se_lun) {
75                         pr_err("%s device entries device pointer is"
76                                 " NULL, but Initiator has access.\n",
77                                 tpg->se_tpg_tfo->get_fabric_name());
78                         continue;
79                 }
80
81                 lun = deve->se_lun;
82                 spin_unlock_irq(&nacl->device_list_lock);
83                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
84                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
85
86                 spin_lock(&lun->lun_acl_lock);
87                 list_for_each_entry_safe(acl, acl_tmp,
88                                         &lun->lun_acl_list, lacl_list) {
89                         if (!strcmp(acl->initiatorname, nacl->initiatorname) &&
90                             (acl->mapped_lun == deve->mapped_lun))
91                                 break;
92                 }
93
94                 if (!acl) {
95                         pr_err("Unable to locate struct se_lun_acl for %s,"
96                                 " mapped_lun: %u\n", nacl->initiatorname,
97                                 deve->mapped_lun);
98                         spin_unlock(&lun->lun_acl_lock);
99                         spin_lock_irq(&nacl->device_list_lock);
100                         continue;
101                 }
102
103                 list_del(&acl->lacl_list);
104                 spin_unlock(&lun->lun_acl_lock);
105
106                 spin_lock_irq(&nacl->device_list_lock);
107                 kfree(acl);
108         }
109         spin_unlock_irq(&nacl->device_list_lock);
110 }
111
112 /*      __core_tpg_get_initiator_node_acl():
113  *
114  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
115  */
116 struct se_node_acl *__core_tpg_get_initiator_node_acl(
117         struct se_portal_group *tpg,
118         const char *initiatorname)
119 {
120         struct se_node_acl *acl;
121
122         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
123                 if (!strcmp(acl->initiatorname, initiatorname))
124                         return acl;
125         }
126
127         return NULL;
128 }
129
130 /*      core_tpg_get_initiator_node_acl():
131  *
132  *
133  */
134 struct se_node_acl *core_tpg_get_initiator_node_acl(
135         struct se_portal_group *tpg,
136         unsigned char *initiatorname)
137 {
138         struct se_node_acl *acl;
139
140         spin_lock_irq(&tpg->acl_node_lock);
141         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
142                 if (!strcmp(acl->initiatorname, initiatorname) &&
143                     !acl->dynamic_node_acl) {
144                         spin_unlock_irq(&tpg->acl_node_lock);
145                         return acl;
146                 }
147         }
148         spin_unlock_irq(&tpg->acl_node_lock);
149
150         return NULL;
151 }
152
153 /*      core_tpg_add_node_to_devs():
154  *
155  *
156  */
157 void core_tpg_add_node_to_devs(
158         struct se_node_acl *acl,
159         struct se_portal_group *tpg)
160 {
161         int i = 0;
162         u32 lun_access = 0;
163         struct se_lun *lun;
164         struct se_device *dev;
165
166         spin_lock(&tpg->tpg_lun_lock);
167         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
168                 lun = &tpg->tpg_lun_list[i];
169                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
170                         continue;
171
172                 spin_unlock(&tpg->tpg_lun_lock);
173
174                 dev = lun->lun_se_dev;
175                 /*
176                  * By default in LIO-Target $FABRIC_MOD,
177                  * demo_mode_write_protect is ON, or READ_ONLY;
178                  */
179                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
180                         if (dev->dev_flags & DF_READ_ONLY)
181                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
182                         else
183                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
184                 } else {
185                         /*
186                          * Allow only optical drives to issue R/W in default RO
187                          * demo mode.
188                          */
189                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
190                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
191                         else
192                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
193                 }
194
195                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
196                         " access for LUN in Demo Mode\n",
197                         tpg->se_tpg_tfo->get_fabric_name(),
198                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
199                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
200                         "READ-WRITE" : "READ-ONLY");
201
202                 core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
203                                 lun_access, acl, tpg, 1);
204                 spin_lock(&tpg->tpg_lun_lock);
205         }
206         spin_unlock(&tpg->tpg_lun_lock);
207 }
208
209 /*      core_set_queue_depth_for_node():
210  *
211  *
212  */
213 static int core_set_queue_depth_for_node(
214         struct se_portal_group *tpg,
215         struct se_node_acl *acl)
216 {
217         if (!acl->queue_depth) {
218                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
219                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
220                         acl->initiatorname);
221                 acl->queue_depth = 1;
222         }
223
224         return 0;
225 }
226
227 /*      core_create_device_list_for_node():
228  *
229  *
230  */
231 static int core_create_device_list_for_node(struct se_node_acl *nacl)
232 {
233         struct se_dev_entry *deve;
234         int i;
235
236         nacl->device_list = kzalloc(sizeof(struct se_dev_entry) *
237                                 TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL);
238         if (!nacl->device_list) {
239                 pr_err("Unable to allocate memory for"
240                         " struct se_node_acl->device_list\n");
241                 return -ENOMEM;
242         }
243         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
244                 deve = &nacl->device_list[i];
245
246                 atomic_set(&deve->ua_count, 0);
247                 atomic_set(&deve->pr_ref_count, 0);
248                 spin_lock_init(&deve->ua_lock);
249                 INIT_LIST_HEAD(&deve->alua_port_list);
250                 INIT_LIST_HEAD(&deve->ua_list);
251         }
252
253         return 0;
254 }
255
256 /*      core_tpg_check_initiator_node_acl()
257  *
258  *
259  */
260 struct se_node_acl *core_tpg_check_initiator_node_acl(
261         struct se_portal_group *tpg,
262         unsigned char *initiatorname)
263 {
264         struct se_node_acl *acl;
265
266         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
267         if (acl)
268                 return acl;
269
270         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
271                 return NULL;
272
273         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
274         if (!acl)
275                 return NULL;
276
277         INIT_LIST_HEAD(&acl->acl_list);
278         INIT_LIST_HEAD(&acl->acl_sess_list);
279         spin_lock_init(&acl->device_list_lock);
280         spin_lock_init(&acl->nacl_sess_lock);
281         atomic_set(&acl->acl_pr_ref_count, 0);
282         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
283         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
284         acl->se_tpg = tpg;
285         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
286         spin_lock_init(&acl->stats_lock);
287         acl->dynamic_node_acl = 1;
288
289         tpg->se_tpg_tfo->set_default_node_attributes(acl);
290
291         if (core_create_device_list_for_node(acl) < 0) {
292                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
293                 return NULL;
294         }
295
296         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
297                 core_free_device_list_for_node(acl, tpg);
298                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
299                 return NULL;
300         }
301         /*
302          * Here we only create demo-mode MappedLUNs from the active
303          * TPG LUNs if the fabric is not explictly asking for
304          * tpg_check_demo_mode_login_only() == 1.
305          */
306         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only != NULL) &&
307             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) == 1))
308                 do { ; } while (0);
309         else
310                 core_tpg_add_node_to_devs(acl, tpg);
311
312         spin_lock_irq(&tpg->acl_node_lock);
313         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
314         tpg->num_node_acls++;
315         spin_unlock_irq(&tpg->acl_node_lock);
316
317         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
318                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
319                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
320                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
321
322         return acl;
323 }
324 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
325
326 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
327 {
328         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
329                 cpu_relax();
330 }
331
332 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
333 {
334         int i, ret;
335         struct se_lun *lun;
336
337         spin_lock(&tpg->tpg_lun_lock);
338         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
339                 lun = &tpg->tpg_lun_list[i];
340
341                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
342                     (lun->lun_se_dev == NULL))
343                         continue;
344
345                 spin_unlock(&tpg->tpg_lun_lock);
346                 ret = core_dev_del_lun(tpg, lun->unpacked_lun);
347                 spin_lock(&tpg->tpg_lun_lock);
348         }
349         spin_unlock(&tpg->tpg_lun_lock);
350 }
351 EXPORT_SYMBOL(core_tpg_clear_object_luns);
352
353 /*      core_tpg_add_initiator_node_acl():
354  *
355  *
356  */
357 struct se_node_acl *core_tpg_add_initiator_node_acl(
358         struct se_portal_group *tpg,
359         struct se_node_acl *se_nacl,
360         const char *initiatorname,
361         u32 queue_depth)
362 {
363         struct se_node_acl *acl = NULL;
364
365         spin_lock_irq(&tpg->acl_node_lock);
366         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
367         if (acl) {
368                 if (acl->dynamic_node_acl) {
369                         acl->dynamic_node_acl = 0;
370                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
371                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
372                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
373                         spin_unlock_irq(&tpg->acl_node_lock);
374                         /*
375                          * Release the locally allocated struct se_node_acl
376                          * because * core_tpg_add_initiator_node_acl() returned
377                          * a pointer to an existing demo mode node ACL.
378                          */
379                         if (se_nacl)
380                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
381                                                         se_nacl);
382                         goto done;
383                 }
384
385                 pr_err("ACL entry for %s Initiator"
386                         " Node %s already exists for TPG %u, ignoring"
387                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
388                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
389                 spin_unlock_irq(&tpg->acl_node_lock);
390                 return ERR_PTR(-EEXIST);
391         }
392         spin_unlock_irq(&tpg->acl_node_lock);
393
394         if (!se_nacl) {
395                 pr_err("struct se_node_acl pointer is NULL\n");
396                 return ERR_PTR(-EINVAL);
397         }
398         /*
399          * For v4.x logic the se_node_acl_s is hanging off a fabric
400          * dependent structure allocated via
401          * struct target_core_fabric_ops->fabric_make_nodeacl()
402          */
403         acl = se_nacl;
404
405         INIT_LIST_HEAD(&acl->acl_list);
406         INIT_LIST_HEAD(&acl->acl_sess_list);
407         spin_lock_init(&acl->device_list_lock);
408         spin_lock_init(&acl->nacl_sess_lock);
409         atomic_set(&acl->acl_pr_ref_count, 0);
410         acl->queue_depth = queue_depth;
411         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
412         acl->se_tpg = tpg;
413         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
414         spin_lock_init(&acl->stats_lock);
415
416         tpg->se_tpg_tfo->set_default_node_attributes(acl);
417
418         if (core_create_device_list_for_node(acl) < 0) {
419                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
420                 return ERR_PTR(-ENOMEM);
421         }
422
423         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
424                 core_free_device_list_for_node(acl, tpg);
425                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
426                 return ERR_PTR(-EINVAL);
427         }
428
429         spin_lock_irq(&tpg->acl_node_lock);
430         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
431         tpg->num_node_acls++;
432         spin_unlock_irq(&tpg->acl_node_lock);
433
434 done:
435         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
436                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
437                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
438                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
439
440         return acl;
441 }
442 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
443
444 /*      core_tpg_del_initiator_node_acl():
445  *
446  *
447  */
448 int core_tpg_del_initiator_node_acl(
449         struct se_portal_group *tpg,
450         struct se_node_acl *acl,
451         int force)
452 {
453         struct se_session *sess, *sess_tmp;
454         int dynamic_acl = 0;
455
456         spin_lock_irq(&tpg->acl_node_lock);
457         if (acl->dynamic_node_acl) {
458                 acl->dynamic_node_acl = 0;
459                 dynamic_acl = 1;
460         }
461         list_del(&acl->acl_list);
462         tpg->num_node_acls--;
463         spin_unlock_irq(&tpg->acl_node_lock);
464
465         spin_lock_bh(&tpg->session_lock);
466         list_for_each_entry_safe(sess, sess_tmp,
467                                 &tpg->tpg_sess_list, sess_list) {
468                 if (sess->se_node_acl != acl)
469                         continue;
470                 /*
471                  * Determine if the session needs to be closed by our context.
472                  */
473                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
474                         continue;
475
476                 spin_unlock_bh(&tpg->session_lock);
477                 /*
478                  * If the $FABRIC_MOD session for the Initiator Node ACL exists,
479                  * forcefully shutdown the $FABRIC_MOD session/nexus.
480                  */
481                 tpg->se_tpg_tfo->close_session(sess);
482
483                 spin_lock_bh(&tpg->session_lock);
484         }
485         spin_unlock_bh(&tpg->session_lock);
486
487         core_tpg_wait_for_nacl_pr_ref(acl);
488         core_clear_initiator_node_from_tpg(acl, tpg);
489         core_free_device_list_for_node(acl, tpg);
490
491         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
492                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
493                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
494                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
495
496         return 0;
497 }
498 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
499
500 /*      core_tpg_set_initiator_node_queue_depth():
501  *
502  *
503  */
504 int core_tpg_set_initiator_node_queue_depth(
505         struct se_portal_group *tpg,
506         unsigned char *initiatorname,
507         u32 queue_depth,
508         int force)
509 {
510         struct se_session *sess, *init_sess = NULL;
511         struct se_node_acl *acl;
512         int dynamic_acl = 0;
513
514         spin_lock_irq(&tpg->acl_node_lock);
515         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
516         if (!acl) {
517                 pr_err("Access Control List entry for %s Initiator"
518                         " Node %s does not exists for TPG %hu, ignoring"
519                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
520                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
521                 spin_unlock_irq(&tpg->acl_node_lock);
522                 return -ENODEV;
523         }
524         if (acl->dynamic_node_acl) {
525                 acl->dynamic_node_acl = 0;
526                 dynamic_acl = 1;
527         }
528         spin_unlock_irq(&tpg->acl_node_lock);
529
530         spin_lock_bh(&tpg->session_lock);
531         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
532                 if (sess->se_node_acl != acl)
533                         continue;
534
535                 if (!force) {
536                         pr_err("Unable to change queue depth for %s"
537                                 " Initiator Node: %s while session is"
538                                 " operational.  To forcefully change the queue"
539                                 " depth and force session reinstatement"
540                                 " use the \"force=1\" parameter.\n",
541                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
542                         spin_unlock_bh(&tpg->session_lock);
543
544                         spin_lock_irq(&tpg->acl_node_lock);
545                         if (dynamic_acl)
546                                 acl->dynamic_node_acl = 1;
547                         spin_unlock_irq(&tpg->acl_node_lock);
548                         return -EEXIST;
549                 }
550                 /*
551                  * Determine if the session needs to be closed by our context.
552                  */
553                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
554                         continue;
555
556                 init_sess = sess;
557                 break;
558         }
559
560         /*
561          * User has requested to change the queue depth for a Initiator Node.
562          * Change the value in the Node's struct se_node_acl, and call
563          * core_set_queue_depth_for_node() to add the requested queue depth.
564          *
565          * Finally call  tpg->se_tpg_tfo->close_session() to force session
566          * reinstatement to occur if there is an active session for the
567          * $FABRIC_MOD Initiator Node in question.
568          */
569         acl->queue_depth = queue_depth;
570
571         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
572                 spin_unlock_bh(&tpg->session_lock);
573                 /*
574                  * Force session reinstatement if
575                  * core_set_queue_depth_for_node() failed, because we assume
576                  * the $FABRIC_MOD has already the set session reinstatement
577                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
578                  */
579                 if (init_sess)
580                         tpg->se_tpg_tfo->close_session(init_sess);
581
582                 spin_lock_irq(&tpg->acl_node_lock);
583                 if (dynamic_acl)
584                         acl->dynamic_node_acl = 1;
585                 spin_unlock_irq(&tpg->acl_node_lock);
586                 return -EINVAL;
587         }
588         spin_unlock_bh(&tpg->session_lock);
589         /*
590          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
591          * forcefully shutdown the $FABRIC_MOD session/nexus.
592          */
593         if (init_sess)
594                 tpg->se_tpg_tfo->close_session(init_sess);
595
596         pr_debug("Successfuly changed queue depth to: %d for Initiator"
597                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
598                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
599                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
600
601         spin_lock_irq(&tpg->acl_node_lock);
602         if (dynamic_acl)
603                 acl->dynamic_node_acl = 1;
604         spin_unlock_irq(&tpg->acl_node_lock);
605
606         return 0;
607 }
608 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
609
610 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
611 {
612         /* Set in core_dev_setup_virtual_lun0() */
613         struct se_device *dev = g_lun0_dev;
614         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
615         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
616         int ret;
617
618         lun->unpacked_lun = 0;
619         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
620         atomic_set(&lun->lun_acl_count, 0);
621         init_completion(&lun->lun_shutdown_comp);
622         INIT_LIST_HEAD(&lun->lun_acl_list);
623         INIT_LIST_HEAD(&lun->lun_cmd_list);
624         spin_lock_init(&lun->lun_acl_lock);
625         spin_lock_init(&lun->lun_cmd_lock);
626         spin_lock_init(&lun->lun_sep_lock);
627
628         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
629         if (ret < 0)
630                 return ret;
631
632         return 0;
633 }
634
635 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
636 {
637         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
638
639         core_tpg_post_dellun(se_tpg, lun);
640 }
641
642 int core_tpg_register(
643         struct target_core_fabric_ops *tfo,
644         struct se_wwn *se_wwn,
645         struct se_portal_group *se_tpg,
646         void *tpg_fabric_ptr,
647         int se_tpg_type)
648 {
649         struct se_lun *lun;
650         u32 i;
651
652         se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) *
653                                 TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
654         if (!se_tpg->tpg_lun_list) {
655                 pr_err("Unable to allocate struct se_portal_group->"
656                                 "tpg_lun_list\n");
657                 return -ENOMEM;
658         }
659
660         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
661                 lun = &se_tpg->tpg_lun_list[i];
662                 lun->unpacked_lun = i;
663                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
664                 atomic_set(&lun->lun_acl_count, 0);
665                 init_completion(&lun->lun_shutdown_comp);
666                 INIT_LIST_HEAD(&lun->lun_acl_list);
667                 INIT_LIST_HEAD(&lun->lun_cmd_list);
668                 spin_lock_init(&lun->lun_acl_lock);
669                 spin_lock_init(&lun->lun_cmd_lock);
670                 spin_lock_init(&lun->lun_sep_lock);
671         }
672
673         se_tpg->se_tpg_type = se_tpg_type;
674         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
675         se_tpg->se_tpg_tfo = tfo;
676         se_tpg->se_tpg_wwn = se_wwn;
677         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
678         INIT_LIST_HEAD(&se_tpg->acl_node_list);
679         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
680         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
681         spin_lock_init(&se_tpg->acl_node_lock);
682         spin_lock_init(&se_tpg->session_lock);
683         spin_lock_init(&se_tpg->tpg_lun_lock);
684
685         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
686                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
687                         kfree(se_tpg);
688                         return -ENOMEM;
689                 }
690         }
691
692         spin_lock_bh(&tpg_lock);
693         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
694         spin_unlock_bh(&tpg_lock);
695
696         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
697                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
698                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
699                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
700                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
701
702         return 0;
703 }
704 EXPORT_SYMBOL(core_tpg_register);
705
706 int core_tpg_deregister(struct se_portal_group *se_tpg)
707 {
708         struct se_node_acl *nacl, *nacl_tmp;
709
710         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
711                 " for endpoint: %s Portal Tag %u\n",
712                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
713                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
714                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
715                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
716
717         spin_lock_bh(&tpg_lock);
718         list_del(&se_tpg->se_tpg_node);
719         spin_unlock_bh(&tpg_lock);
720
721         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
722                 cpu_relax();
723         /*
724          * Release any remaining demo-mode generated se_node_acl that have
725          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
726          * in transport_deregister_session().
727          */
728         spin_lock_irq(&se_tpg->acl_node_lock);
729         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
730                         acl_list) {
731                 list_del(&nacl->acl_list);
732                 se_tpg->num_node_acls--;
733                 spin_unlock_irq(&se_tpg->acl_node_lock);
734
735                 core_tpg_wait_for_nacl_pr_ref(nacl);
736                 core_free_device_list_for_node(nacl, se_tpg);
737                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
738
739                 spin_lock_irq(&se_tpg->acl_node_lock);
740         }
741         spin_unlock_irq(&se_tpg->acl_node_lock);
742
743         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
744                 core_tpg_release_virtual_lun0(se_tpg);
745
746         se_tpg->se_tpg_fabric_ptr = NULL;
747         kfree(se_tpg->tpg_lun_list);
748         return 0;
749 }
750 EXPORT_SYMBOL(core_tpg_deregister);
751
752 struct se_lun *core_tpg_pre_addlun(
753         struct se_portal_group *tpg,
754         u32 unpacked_lun)
755 {
756         struct se_lun *lun;
757
758         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
759                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
760                         "-1: %u for Target Portal Group: %u\n",
761                         tpg->se_tpg_tfo->get_fabric_name(),
762                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
763                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
764                 return ERR_PTR(-EOVERFLOW);
765         }
766
767         spin_lock(&tpg->tpg_lun_lock);
768         lun = &tpg->tpg_lun_list[unpacked_lun];
769         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
770                 pr_err("TPG Logical Unit Number: %u is already active"
771                         " on %s Target Portal Group: %u, ignoring request.\n",
772                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
773                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
774                 spin_unlock(&tpg->tpg_lun_lock);
775                 return ERR_PTR(-EINVAL);
776         }
777         spin_unlock(&tpg->tpg_lun_lock);
778
779         return lun;
780 }
781
782 int core_tpg_post_addlun(
783         struct se_portal_group *tpg,
784         struct se_lun *lun,
785         u32 lun_access,
786         void *lun_ptr)
787 {
788         int ret;
789
790         ret = core_dev_export(lun_ptr, tpg, lun);
791         if (ret < 0)
792                 return ret;
793
794         spin_lock(&tpg->tpg_lun_lock);
795         lun->lun_access = lun_access;
796         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
797         spin_unlock(&tpg->tpg_lun_lock);
798
799         return 0;
800 }
801
802 static void core_tpg_shutdown_lun(
803         struct se_portal_group *tpg,
804         struct se_lun *lun)
805 {
806         core_clear_lun_from_tpg(lun, tpg);
807         transport_clear_lun_from_sessions(lun);
808 }
809
810 struct se_lun *core_tpg_pre_dellun(
811         struct se_portal_group *tpg,
812         u32 unpacked_lun,
813         int *ret)
814 {
815         struct se_lun *lun;
816
817         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
818                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
819                         "-1: %u for Target Portal Group: %u\n",
820                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
821                         TRANSPORT_MAX_LUNS_PER_TPG-1,
822                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
823                 return ERR_PTR(-EOVERFLOW);
824         }
825
826         spin_lock(&tpg->tpg_lun_lock);
827         lun = &tpg->tpg_lun_list[unpacked_lun];
828         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
829                 pr_err("%s Logical Unit Number: %u is not active on"
830                         " Target Portal Group: %u, ignoring request.\n",
831                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
832                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
833                 spin_unlock(&tpg->tpg_lun_lock);
834                 return ERR_PTR(-ENODEV);
835         }
836         spin_unlock(&tpg->tpg_lun_lock);
837
838         return lun;
839 }
840
841 int core_tpg_post_dellun(
842         struct se_portal_group *tpg,
843         struct se_lun *lun)
844 {
845         core_tpg_shutdown_lun(tpg, lun);
846
847         core_dev_unexport(lun->lun_se_dev, tpg, lun);
848
849         spin_lock(&tpg->tpg_lun_lock);
850         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
851         spin_unlock(&tpg->tpg_lun_lock);
852
853         return 0;
854 }