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xHCI: fix bug in xhci_clear_command_ring()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / target / target_core_device.c
blobba5edec2c5f858edaa011a463fae7bb31ad2a008
1 /*******************************************************************************
2 * Filename: target_core_device.c (based on iscsi_target_device.c)
3 *
4 * This file contains the TCM Virtual Device and Disk Transport
5 * agnostic related functions.
6 *
7 * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
8 * Copyright (c) 2005-2006 SBE, Inc. All Rights Reserved.
9 * Copyright (c) 2007-2010 Rising Tide Systems
10 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 *
12 * Nicholas A. Bellinger <nab@kernel.org>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 *
28 ******************************************************************************/
29
30 #include <linux/net.h>
31 #include <linux/string.h>
32 #include <linux/delay.h>
33 #include <linux/timer.h>
34 #include <linux/slab.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
37 #include <linux/in.h>
38 #include <linux/export.h>
39 #include <net/sock.h>
40 #include <net/tcp.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_device.h>
43
44 #include <target/target_core_base.h>
45 #include <target/target_core_device.h>
46 #include <target/target_core_tpg.h>
47 #include <target/target_core_transport.h>
48 #include <target/target_core_fabric_ops.h>
49
50 #include "target_core_alua.h"
51 #include "target_core_hba.h"
52 #include "target_core_pr.h"
53 #include "target_core_ua.h"
54
55 static void se_dev_start(struct se_device *dev);
56 static void se_dev_stop(struct se_device *dev);
57
58 static struct se_hba *lun0_hba;
59 static struct se_subsystem_dev *lun0_su_dev;
60 /* not static, needed by tpg.c */
61 struct se_device *g_lun0_dev;
62
63 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
64 {
65 struct se_lun *se_lun = NULL;
66 struct se_session *se_sess = se_cmd->se_sess;
67 struct se_device *dev;
68 unsigned long flags;
69
70 if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
71 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
72 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
73 return -ENODEV;
74 }
75
76 spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
77 se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
78 if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
79 struct se_dev_entry *deve = se_cmd->se_deve;
80
81 deve->total_cmds++;
82 deve->total_bytes += se_cmd->data_length;
83
84 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
85 (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
86 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
87 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
88 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
89 " Access for 0x%08x\n",
90 se_cmd->se_tfo->get_fabric_name(),
91 unpacked_lun);
92 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
93 return -EACCES;
94 }
95
96 if (se_cmd->data_direction == DMA_TO_DEVICE)
97 deve->write_bytes += se_cmd->data_length;
98 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
99 deve->read_bytes += se_cmd->data_length;
100
101 deve->deve_cmds++;
102
103 se_lun = deve->se_lun;
104 se_cmd->se_lun = deve->se_lun;
105 se_cmd->pr_res_key = deve->pr_res_key;
106 se_cmd->orig_fe_lun = unpacked_lun;
107 se_cmd->se_orig_obj_ptr = se_cmd->se_lun->lun_se_dev;
108 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
109 }
110 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
111
112 if (!se_lun) {
113 /*
114 * Use the se_portal_group->tpg_virt_lun0 to allow for
115 * REPORT_LUNS, et al to be returned when no active
116 * MappedLUN=0 exists for this Initiator Port.
117 */
118 if (unpacked_lun != 0) {
119 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
120 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
121 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
122 " Access for 0x%08x\n",
123 se_cmd->se_tfo->get_fabric_name(),
124 unpacked_lun);
125 return -ENODEV;
126 }
127 /*
128 * Force WRITE PROTECT for virtual LUN 0
129 */
130 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
131 (se_cmd->data_direction != DMA_NONE)) {
132 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
133 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
134 return -EACCES;
135 }
136
137 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
138 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
139 se_cmd->orig_fe_lun = 0;
140 se_cmd->se_orig_obj_ptr = se_cmd->se_lun->lun_se_dev;
141 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
142 }
143 /*
144 * Determine if the struct se_lun is online.
145 * FIXME: Check for LUN_RESET + UNIT Attention
146 */
147 if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
148 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
149 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
150 return -ENODEV;
151 }
152
153 /* Directly associate cmd with se_dev */
154 se_cmd->se_dev = se_lun->lun_se_dev;
155
156 /* TODO: get rid of this and use atomics for stats */
157 dev = se_lun->lun_se_dev;
158 spin_lock_irqsave(&dev->stats_lock, flags);
159 dev->num_cmds++;
160 if (se_cmd->data_direction == DMA_TO_DEVICE)
161 dev->write_bytes += se_cmd->data_length;
162 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
163 dev->read_bytes += se_cmd->data_length;
164 spin_unlock_irqrestore(&dev->stats_lock, flags);
165
166 /*
167 * Add the iscsi_cmd_t to the struct se_lun's cmd list. This list is used
168 * for tracking state of struct se_cmds during LUN shutdown events.
169 */
170 spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
171 list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
172 atomic_set(&se_cmd->transport_lun_active, 1);
173 spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
174
175 return 0;
176 }
177 EXPORT_SYMBOL(transport_lookup_cmd_lun);
178
179 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
180 {
181 struct se_dev_entry *deve;
182 struct se_lun *se_lun = NULL;
183 struct se_session *se_sess = se_cmd->se_sess;
184 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
185 unsigned long flags;
186
187 if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
188 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
189 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
190 return -ENODEV;
191 }
192
193 spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
194 se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
195 deve = se_cmd->se_deve;
196
197 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
198 se_tmr->tmr_lun = deve->se_lun;
199 se_cmd->se_lun = deve->se_lun;
200 se_lun = deve->se_lun;
201 se_cmd->pr_res_key = deve->pr_res_key;
202 se_cmd->orig_fe_lun = unpacked_lun;
203 se_cmd->se_orig_obj_ptr = se_cmd->se_dev;
204 }
205 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
206
207 if (!se_lun) {
208 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
209 " Access for 0x%08x\n",
210 se_cmd->se_tfo->get_fabric_name(),
211 unpacked_lun);
212 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
213 return -ENODEV;
214 }
215 /*
216 * Determine if the struct se_lun is online.
217 * FIXME: Check for LUN_RESET + UNIT Attention
218 */
219 if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
220 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
221 return -ENODEV;
222 }
223
224 /* Directly associate cmd with se_dev */
225 se_cmd->se_dev = se_lun->lun_se_dev;
226 se_tmr->tmr_dev = se_lun->lun_se_dev;
227
228 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
229 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
230 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
231
232 return 0;
233 }
234 EXPORT_SYMBOL(transport_lookup_tmr_lun);
235
236 /*
237 * This function is called from core_scsi3_emulate_pro_register_and_move()
238 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
239 * when a matching rtpi is found.
240 */
241 struct se_dev_entry *core_get_se_deve_from_rtpi(
242 struct se_node_acl *nacl,
243 u16 rtpi)
244 {
245 struct se_dev_entry *deve;
246 struct se_lun *lun;
247 struct se_port *port;
248 struct se_portal_group *tpg = nacl->se_tpg;
249 u32 i;
250
251 spin_lock_irq(&nacl->device_list_lock);
252 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
253 deve = &nacl->device_list[i];
254
255 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
256 continue;
257
258 lun = deve->se_lun;
259 if (!lun) {
260 pr_err("%s device entries device pointer is"
261 " NULL, but Initiator has access.\n",
262 tpg->se_tpg_tfo->get_fabric_name());
263 continue;
264 }
265 port = lun->lun_sep;
266 if (!port) {
267 pr_err("%s device entries device pointer is"
268 " NULL, but Initiator has access.\n",
269 tpg->se_tpg_tfo->get_fabric_name());
270 continue;
271 }
272 if (port->sep_rtpi != rtpi)
273 continue;
274
275 atomic_inc(&deve->pr_ref_count);
276 smp_mb__after_atomic_inc();
277 spin_unlock_irq(&nacl->device_list_lock);
278
279 return deve;
280 }
281 spin_unlock_irq(&nacl->device_list_lock);
282
283 return NULL;
284 }
285
286 int core_free_device_list_for_node(
287 struct se_node_acl *nacl,
288 struct se_portal_group *tpg)
289 {
290 struct se_dev_entry *deve;
291 struct se_lun *lun;
292 u32 i;
293
294 if (!nacl->device_list)
295 return 0;
296
297 spin_lock_irq(&nacl->device_list_lock);
298 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
299 deve = &nacl->device_list[i];
300
301 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
302 continue;
303
304 if (!deve->se_lun) {
305 pr_err("%s device entries device pointer is"
306 " NULL, but Initiator has access.\n",
307 tpg->se_tpg_tfo->get_fabric_name());
308 continue;
309 }
310 lun = deve->se_lun;
311
312 spin_unlock_irq(&nacl->device_list_lock);
313 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
314 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
315 spin_lock_irq(&nacl->device_list_lock);
316 }
317 spin_unlock_irq(&nacl->device_list_lock);
318
319 kfree(nacl->device_list);
320 nacl->device_list = NULL;
321
322 return 0;
323 }
324
325 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
326 {
327 struct se_dev_entry *deve;
328
329 spin_lock_irq(&se_nacl->device_list_lock);
330 deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
331 deve->deve_cmds--;
332 spin_unlock_irq(&se_nacl->device_list_lock);
333 }
334
335 void core_update_device_list_access(
336 u32 mapped_lun,
337 u32 lun_access,
338 struct se_node_acl *nacl)
339 {
340 struct se_dev_entry *deve;
341
342 spin_lock_irq(&nacl->device_list_lock);
343 deve = &nacl->device_list[mapped_lun];
344 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
345 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
346 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
347 } else {
348 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
349 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
350 }
351 spin_unlock_irq(&nacl->device_list_lock);
352 }
353
354 /* core_update_device_list_for_node():
355 *
356 *
357 */
358 int core_update_device_list_for_node(
359 struct se_lun *lun,
360 struct se_lun_acl *lun_acl,
361 u32 mapped_lun,
362 u32 lun_access,
363 struct se_node_acl *nacl,
364 struct se_portal_group *tpg,
365 int enable)
366 {
367 struct se_port *port = lun->lun_sep;
368 struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
369 int trans = 0;
370 /*
371 * If the MappedLUN entry is being disabled, the entry in
372 * port->sep_alua_list must be removed now before clearing the
373 * struct se_dev_entry pointers below as logic in
374 * core_alua_do_transition_tg_pt() depends on these being present.
375 */
376 if (!enable) {
377 /*
378 * deve->se_lun_acl will be NULL for demo-mode created LUNs
379 * that have not been explicitly concerted to MappedLUNs ->
380 * struct se_lun_acl, but we remove deve->alua_port_list from
381 * port->sep_alua_list. This also means that active UAs and
382 * NodeACL context specific PR metadata for demo-mode
383 * MappedLUN *deve will be released below..
384 */
385 spin_lock_bh(&port->sep_alua_lock);
386 list_del(&deve->alua_port_list);
387 spin_unlock_bh(&port->sep_alua_lock);
388 }
389
390 spin_lock_irq(&nacl->device_list_lock);
391 if (enable) {
392 /*
393 * Check if the call is handling demo mode -> explict LUN ACL
394 * transition. This transition must be for the same struct se_lun
395 * + mapped_lun that was setup in demo mode..
396 */
397 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
398 if (deve->se_lun_acl != NULL) {
399 pr_err("struct se_dev_entry->se_lun_acl"
400 " already set for demo mode -> explict"
401 " LUN ACL transition\n");
402 spin_unlock_irq(&nacl->device_list_lock);
403 return -EINVAL;
404 }
405 if (deve->se_lun != lun) {
406 pr_err("struct se_dev_entry->se_lun does"
407 " match passed struct se_lun for demo mode"
408 " -> explict LUN ACL transition\n");
409 spin_unlock_irq(&nacl->device_list_lock);
410 return -EINVAL;
411 }
412 deve->se_lun_acl = lun_acl;
413 trans = 1;
414 } else {
415 deve->se_lun = lun;
416 deve->se_lun_acl = lun_acl;
417 deve->mapped_lun = mapped_lun;
418 deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
419 }
420
421 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
422 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
423 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
424 } else {
425 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
426 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
427 }
428
429 if (trans) {
430 spin_unlock_irq(&nacl->device_list_lock);
431 return 0;
432 }
433 deve->creation_time = get_jiffies_64();
434 deve->attach_count++;
435 spin_unlock_irq(&nacl->device_list_lock);
436
437 spin_lock_bh(&port->sep_alua_lock);
438 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
439 spin_unlock_bh(&port->sep_alua_lock);
440
441 return 0;
442 }
443 /*
444 * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
445 * PR operation to complete.
446 */
447 spin_unlock_irq(&nacl->device_list_lock);
448 while (atomic_read(&deve->pr_ref_count) != 0)
449 cpu_relax();
450 spin_lock_irq(&nacl->device_list_lock);
451 /*
452 * Disable struct se_dev_entry LUN ACL mapping
453 */
454 core_scsi3_ua_release_all(deve);
455 deve->se_lun = NULL;
456 deve->se_lun_acl = NULL;
457 deve->lun_flags = 0;
458 deve->creation_time = 0;
459 deve->attach_count--;
460 spin_unlock_irq(&nacl->device_list_lock);
461
462 core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
463 return 0;
464 }
465
466 /* core_clear_lun_from_tpg():
467 *
468 *
469 */
470 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
471 {
472 struct se_node_acl *nacl;
473 struct se_dev_entry *deve;
474 u32 i;
475
476 spin_lock_irq(&tpg->acl_node_lock);
477 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
478 spin_unlock_irq(&tpg->acl_node_lock);
479
480 spin_lock_irq(&nacl->device_list_lock);
481 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
482 deve = &nacl->device_list[i];
483 if (lun != deve->se_lun)
484 continue;
485 spin_unlock_irq(&nacl->device_list_lock);
486
487 core_update_device_list_for_node(lun, NULL,
488 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
489 nacl, tpg, 0);
490
491 spin_lock_irq(&nacl->device_list_lock);
492 }
493 spin_unlock_irq(&nacl->device_list_lock);
494
495 spin_lock_irq(&tpg->acl_node_lock);
496 }
497 spin_unlock_irq(&tpg->acl_node_lock);
498 }
499
500 static struct se_port *core_alloc_port(struct se_device *dev)
501 {
502 struct se_port *port, *port_tmp;
503
504 port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
505 if (!port) {
506 pr_err("Unable to allocate struct se_port\n");
507 return ERR_PTR(-ENOMEM);
508 }
509 INIT_LIST_HEAD(&port->sep_alua_list);
510 INIT_LIST_HEAD(&port->sep_list);
511 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
512 spin_lock_init(&port->sep_alua_lock);
513 mutex_init(&port->sep_tg_pt_md_mutex);
514
515 spin_lock(&dev->se_port_lock);
516 if (dev->dev_port_count == 0x0000ffff) {
517 pr_warn("Reached dev->dev_port_count =="
518 " 0x0000ffff\n");
519 spin_unlock(&dev->se_port_lock);
520 return ERR_PTR(-ENOSPC);
521 }
522 again:
523 /*
524 * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
525 * Here is the table from spc4r17 section 7.7.3.8.
526 *
527 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
528 *
529 * Code Description
530 * 0h Reserved
531 * 1h Relative port 1, historically known as port A
532 * 2h Relative port 2, historically known as port B
533 * 3h to FFFFh Relative port 3 through 65 535
534 */
535 port->sep_rtpi = dev->dev_rpti_counter++;
536 if (!port->sep_rtpi)
537 goto again;
538
539 list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
540 /*
541 * Make sure RELATIVE TARGET PORT IDENTIFER is unique
542 * for 16-bit wrap..
543 */
544 if (port->sep_rtpi == port_tmp->sep_rtpi)
545 goto again;
546 }
547 spin_unlock(&dev->se_port_lock);
548
549 return port;
550 }
551
552 static void core_export_port(
553 struct se_device *dev,
554 struct se_portal_group *tpg,
555 struct se_port *port,
556 struct se_lun *lun)
557 {
558 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
559 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
560
561 spin_lock(&dev->se_port_lock);
562 spin_lock(&lun->lun_sep_lock);
563 port->sep_tpg = tpg;
564 port->sep_lun = lun;
565 lun->lun_sep = port;
566 spin_unlock(&lun->lun_sep_lock);
567
568 list_add_tail(&port->sep_list, &dev->dev_sep_list);
569 spin_unlock(&dev->se_port_lock);
570
571 if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
572 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
573 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
574 pr_err("Unable to allocate t10_alua_tg_pt"
575 "_gp_member_t\n");
576 return;
577 }
578 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
579 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
580 su_dev->t10_alua.default_tg_pt_gp);
581 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
582 pr_debug("%s/%s: Adding to default ALUA Target Port"
583 " Group: alua/default_tg_pt_gp\n",
584 dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
585 }
586
587 dev->dev_port_count++;
588 port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
589 }
590
591 /*
592 * Called with struct se_device->se_port_lock spinlock held.
593 */
594 static void core_release_port(struct se_device *dev, struct se_port *port)
595 __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
596 {
597 /*
598 * Wait for any port reference for PR ALL_TG_PT=1 operation
599 * to complete in __core_scsi3_alloc_registration()
600 */
601 spin_unlock(&dev->se_port_lock);
602 if (atomic_read(&port->sep_tg_pt_ref_cnt))
603 cpu_relax();
604 spin_lock(&dev->se_port_lock);
605
606 core_alua_free_tg_pt_gp_mem(port);
607
608 list_del(&port->sep_list);
609 dev->dev_port_count--;
610 kfree(port);
611 }
612
613 int core_dev_export(
614 struct se_device *dev,
615 struct se_portal_group *tpg,
616 struct se_lun *lun)
617 {
618 struct se_port *port;
619
620 port = core_alloc_port(dev);
621 if (IS_ERR(port))
622 return PTR_ERR(port);
623
624 lun->lun_se_dev = dev;
625 se_dev_start(dev);
626
627 atomic_inc(&dev->dev_export_obj.obj_access_count);
628 core_export_port(dev, tpg, port, lun);
629 return 0;
630 }
631
632 void core_dev_unexport(
633 struct se_device *dev,
634 struct se_portal_group *tpg,
635 struct se_lun *lun)
636 {
637 struct se_port *port = lun->lun_sep;
638
639 spin_lock(&lun->lun_sep_lock);
640 if (lun->lun_se_dev == NULL) {
641 spin_unlock(&lun->lun_sep_lock);
642 return;
643 }
644 spin_unlock(&lun->lun_sep_lock);
645
646 spin_lock(&dev->se_port_lock);
647 atomic_dec(&dev->dev_export_obj.obj_access_count);
648 core_release_port(dev, port);
649 spin_unlock(&dev->se_port_lock);
650
651 se_dev_stop(dev);
652 lun->lun_se_dev = NULL;
653 }
654
655 int target_report_luns(struct se_task *se_task)
656 {
657 struct se_cmd *se_cmd = se_task->task_se_cmd;
658 struct se_dev_entry *deve;
659 struct se_lun *se_lun;
660 struct se_session *se_sess = se_cmd->se_sess;
661 unsigned char *buf;
662 u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
663
664 buf = transport_kmap_first_data_page(se_cmd);
665
666 /*
667 * If no struct se_session pointer is present, this struct se_cmd is
668 * coming via a target_core_mod PASSTHROUGH op, and not through
669 * a $FABRIC_MOD. In that case, report LUN=0 only.
670 */
671 if (!se_sess) {
672 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
673 lun_count = 1;
674 goto done;
675 }
676
677 spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
678 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
679 deve = &se_sess->se_node_acl->device_list[i];
680 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
681 continue;
682 se_lun = deve->se_lun;
683 /*
684 * We determine the correct LUN LIST LENGTH even once we
685 * have reached the initial allocation length.
686 * See SPC2-R20 7.19.
687 */
688 lun_count++;
689 if ((cdb_offset + 8) >= se_cmd->data_length)
690 continue;
691
692 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
693 offset += 8;
694 cdb_offset += 8;
695 }
696 spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
697
698 /*
699 * See SPC3 r07, page 159.
700 */
701 done:
702 transport_kunmap_first_data_page(se_cmd);
703 lun_count *= 8;
704 buf[0] = ((lun_count >> 24) & 0xff);
705 buf[1] = ((lun_count >> 16) & 0xff);
706 buf[2] = ((lun_count >> 8) & 0xff);
707 buf[3] = (lun_count & 0xff);
708
709 se_task->task_scsi_status = GOOD;
710 transport_complete_task(se_task, 1);
711 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
712 }
713
714 /* se_release_device_for_hba():
715 *
716 *
717 */
718 void se_release_device_for_hba(struct se_device *dev)
719 {
720 struct se_hba *hba = dev->se_hba;
721
722 if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
723 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
724 (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
725 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
726 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
727 se_dev_stop(dev);
728
729 if (dev->dev_ptr) {
730 kthread_stop(dev->process_thread);
731 if (dev->transport->free_device)
732 dev->transport->free_device(dev->dev_ptr);
733 }
734
735 spin_lock(&hba->device_lock);
736 list_del(&dev->dev_list);
737 hba->dev_count--;
738 spin_unlock(&hba->device_lock);
739
740 core_scsi3_free_all_registrations(dev);
741 se_release_vpd_for_dev(dev);
742
743 kfree(dev);
744 }
745
746 void se_release_vpd_for_dev(struct se_device *dev)
747 {
748 struct t10_vpd *vpd, *vpd_tmp;
749
750 spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
751 list_for_each_entry_safe(vpd, vpd_tmp,
752 &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
753 list_del(&vpd->vpd_list);
754 kfree(vpd);
755 }
756 spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
757 }
758
759 /* se_free_virtual_device():
760 *
761 * Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
762 */
763 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
764 {
765 if (!list_empty(&dev->dev_sep_list))
766 dump_stack();
767
768 core_alua_free_lu_gp_mem(dev);
769 se_release_device_for_hba(dev);
770
771 return 0;
772 }
773
774 static void se_dev_start(struct se_device *dev)
775 {
776 struct se_hba *hba = dev->se_hba;
777
778 spin_lock(&hba->device_lock);
779 atomic_inc(&dev->dev_obj.obj_access_count);
780 if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
781 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
782 dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
783 dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
784 } else if (dev->dev_status &
785 TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
786 dev->dev_status &=
787 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
788 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
789 }
790 }
791 spin_unlock(&hba->device_lock);
792 }
793
794 static void se_dev_stop(struct se_device *dev)
795 {
796 struct se_hba *hba = dev->se_hba;
797
798 spin_lock(&hba->device_lock);
799 atomic_dec(&dev->dev_obj.obj_access_count);
800 if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
801 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
802 dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
803 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
804 } else if (dev->dev_status &
805 TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
806 dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
807 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
808 }
809 }
810 spin_unlock(&hba->device_lock);
811 }
812
813 int se_dev_check_online(struct se_device *dev)
814 {
815 unsigned long flags;
816 int ret;
817
818 spin_lock_irqsave(&dev->dev_status_lock, flags);
819 ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
820 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
821 spin_unlock_irqrestore(&dev->dev_status_lock, flags);
822
823 return ret;
824 }
825
826 int se_dev_check_shutdown(struct se_device *dev)
827 {
828 int ret;
829
830 spin_lock_irq(&dev->dev_status_lock);
831 ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
832 spin_unlock_irq(&dev->dev_status_lock);
833
834 return ret;
835 }
836
837 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
838 {
839 u32 tmp, aligned_max_sectors;
840 /*
841 * Limit max_sectors to a PAGE_SIZE aligned value for modern
842 * transport_allocate_data_tasks() operation.
843 */
844 tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
845 aligned_max_sectors = (tmp / block_size);
846 if (max_sectors != aligned_max_sectors) {
847 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
848 " to %u\n", max_sectors, aligned_max_sectors);
849 return aligned_max_sectors;
850 }
851
852 return max_sectors;
853 }
854
855 void se_dev_set_default_attribs(
856 struct se_device *dev,
857 struct se_dev_limits *dev_limits)
858 {
859 struct queue_limits *limits = &dev_limits->limits;
860
861 dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
862 dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
863 dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
864 dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
865 dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
866 dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
867 dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
868 dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
869 dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
870 dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
871 dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
872 dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
873 dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
874 /*
875 * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
876 * iblock_create_virtdevice() from struct queue_limits values
877 * if blk_queue_discard()==1
878 */
879 dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
880 dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
881 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
882 dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
883 dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
884 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
885 /*
886 * block_size is based on subsystem plugin dependent requirements.
887 */
888 dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
889 dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
890 /*
891 * max_sectors is based on subsystem plugin dependent requirements.
892 */
893 dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
894 /*
895 * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
896 */
897 limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
898 limits->logical_block_size);
899 dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
900 /*
901 * Set optimal_sectors from max_sectors, which can be lowered via
902 * configfs.
903 */
904 dev->se_sub_dev->se_dev_attrib.optimal_sectors = limits->max_sectors;
905 /*
906 * queue_depth is based on subsystem plugin dependent requirements.
907 */
908 dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
909 dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
910 }
911
912 int se_dev_set_max_unmap_lba_count(
913 struct se_device *dev,
914 u32 max_unmap_lba_count)
915 {
916 dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
917 pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
918 dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
919 return 0;
920 }
921
922 int se_dev_set_max_unmap_block_desc_count(
923 struct se_device *dev,
924 u32 max_unmap_block_desc_count)
925 {
926 dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
927 max_unmap_block_desc_count;
928 pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
929 dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
930 return 0;
931 }
932
933 int se_dev_set_unmap_granularity(
934 struct se_device *dev,
935 u32 unmap_granularity)
936 {
937 dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
938 pr_debug("dev[%p]: Set unmap_granularity: %u\n",
939 dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
940 return 0;
941 }
942
943 int se_dev_set_unmap_granularity_alignment(
944 struct se_device *dev,
945 u32 unmap_granularity_alignment)
946 {
947 dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
948 pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
949 dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
950 return 0;
951 }
952
953 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
954 {
955 if (flag != 0 && flag != 1) {
956 pr_err("Illegal value %d\n", flag);
957 return -EINVAL;
958 }
959
960 pr_err("dpo_emulated not supported\n");
961 return -EINVAL;
962 }
963
964 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
965 {
966 if (flag != 0 && flag != 1) {
967 pr_err("Illegal value %d\n", flag);
968 return -EINVAL;
969 }
970
971 if (dev->transport->fua_write_emulated == 0) {
972 pr_err("fua_write_emulated not supported\n");
973 return -EINVAL;
974 }
975 dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
976 pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
977 dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
978 return 0;
979 }
980
981 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
982 {
983 if (flag != 0 && flag != 1) {
984 pr_err("Illegal value %d\n", flag);
985 return -EINVAL;
986 }
987
988 pr_err("ua read emulated not supported\n");
989 return -EINVAL;
990 }
991
992 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
993 {
994 if (flag != 0 && flag != 1) {
995 pr_err("Illegal value %d\n", flag);
996 return -EINVAL;
997 }
998 if (dev->transport->write_cache_emulated == 0) {
999 pr_err("write_cache_emulated not supported\n");
1000 return -EINVAL;
1001 }
1002 dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1003 pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1004 dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1005 return 0;
1006 }
1007
1008 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1009 {
1010 if ((flag != 0) && (flag != 1) && (flag != 2)) {
1011 pr_err("Illegal value %d\n", flag);
1012 return -EINVAL;
1013 }
1014
1015 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1016 pr_err("dev[%p]: Unable to change SE Device"
1017 " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1018 " exists\n", dev,
1019 atomic_read(&dev->dev_export_obj.obj_access_count));
1020 return -EINVAL;
1021 }
1022 dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1023 pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1024 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1025
1026 return 0;
1027 }
1028
1029 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1030 {
1031 if ((flag != 0) && (flag != 1)) {
1032 pr_err("Illegal value %d\n", flag);
1033 return -EINVAL;
1034 }
1035
1036 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1037 pr_err("dev[%p]: Unable to change SE Device TAS while"
1038 " dev_export_obj: %d count 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_tas = flag;
1043 pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1044 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1045
1046 return 0;
1047 }
1048
1049 int se_dev_set_emulate_tpu(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 * We expect this value to be non-zero when generic Block Layer
1057 * Discard supported is detected iblock_create_virtdevice().
1058 */
1059 if (!dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1060 pr_err("Generic Block Discard not supported\n");
1061 return -ENOSYS;
1062 }
1063
1064 dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1065 pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1066 dev, flag);
1067 return 0;
1068 }
1069
1070 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1071 {
1072 if ((flag != 0) && (flag != 1)) {
1073 pr_err("Illegal value %d\n", flag);
1074 return -EINVAL;
1075 }
1076 /*
1077 * We expect this value to be non-zero when generic Block Layer
1078 * Discard supported is detected iblock_create_virtdevice().
1079 */
1080 if (!dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1081 pr_err("Generic Block Discard not supported\n");
1082 return -ENOSYS;
1083 }
1084
1085 dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1086 pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1087 dev, flag);
1088 return 0;
1089 }
1090
1091 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1092 {
1093 if ((flag != 0) && (flag != 1)) {
1094 pr_err("Illegal value %d\n", flag);
1095 return -EINVAL;
1096 }
1097 dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1098 pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1099 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1100 return 0;
1101 }
1102
1103 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1104 {
1105 if ((flag != 0) && (flag != 1)) {
1106 printk(KERN_ERR "Illegal value %d\n", flag);
1107 return -EINVAL;
1108 }
1109 dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1110 pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1111 dev, flag);
1112 return 0;
1113 }
1114
1115 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1116 {
1117 if (flag != 0) {
1118 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1119 " reordering not implemented\n", dev);
1120 return -ENOSYS;
1121 }
1122 dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1123 pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1124 return 0;
1125 }
1126
1127 /*
1128 * Note, this can only be called on unexported SE Device Object.
1129 */
1130 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1131 {
1132 u32 orig_queue_depth = dev->queue_depth;
1133
1134 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1135 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1136 " dev_export_obj: %d count exists\n", dev,
1137 atomic_read(&dev->dev_export_obj.obj_access_count));
1138 return -EINVAL;
1139 }
1140 if (!queue_depth) {
1141 pr_err("dev[%p]: Illegal ZERO value for queue"
1142 "_depth\n", dev);
1143 return -EINVAL;
1144 }
1145
1146 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1147 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1148 pr_err("dev[%p]: Passed queue_depth: %u"
1149 " exceeds TCM/SE_Device TCQ: %u\n",
1150 dev, queue_depth,
1151 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1152 return -EINVAL;
1153 }
1154 } else {
1155 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1156 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1157 pr_err("dev[%p]: Passed queue_depth:"
1158 " %u exceeds TCM/SE_Device MAX"
1159 " TCQ: %u\n", dev, queue_depth,
1160 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1161 return -EINVAL;
1162 }
1163 }
1164 }
1165
1166 dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1167 if (queue_depth > orig_queue_depth)
1168 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1169 else if (queue_depth < orig_queue_depth)
1170 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1171
1172 pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1173 dev, queue_depth);
1174 return 0;
1175 }
1176
1177 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1178 {
1179 int force = 0; /* Force setting for VDEVS */
1180
1181 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1182 pr_err("dev[%p]: Unable to change SE Device"
1183 " max_sectors while dev_export_obj: %d count exists\n",
1184 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1185 return -EINVAL;
1186 }
1187 if (!max_sectors) {
1188 pr_err("dev[%p]: Illegal ZERO value for"
1189 " max_sectors\n", dev);
1190 return -EINVAL;
1191 }
1192 if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1193 pr_err("dev[%p]: Passed max_sectors: %u less than"
1194 " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1195 DA_STATUS_MAX_SECTORS_MIN);
1196 return -EINVAL;
1197 }
1198 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1199 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1200 pr_err("dev[%p]: Passed max_sectors: %u"
1201 " greater than TCM/SE_Device max_sectors:"
1202 " %u\n", dev, max_sectors,
1203 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1204 return -EINVAL;
1205 }
1206 } else {
1207 if (!force && (max_sectors >
1208 dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1209 pr_err("dev[%p]: Passed max_sectors: %u"
1210 " greater than TCM/SE_Device max_sectors"
1211 ": %u, use force=1 to override.\n", dev,
1212 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1213 return -EINVAL;
1214 }
1215 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1216 pr_err("dev[%p]: Passed max_sectors: %u"
1217 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1218 " %u\n", dev, max_sectors,
1219 DA_STATUS_MAX_SECTORS_MAX);
1220 return -EINVAL;
1221 }
1222 }
1223 /*
1224 * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1225 */
1226 max_sectors = se_dev_align_max_sectors(max_sectors,
1227 dev->se_sub_dev->se_dev_attrib.block_size);
1228
1229 dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1230 pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1231 dev, max_sectors);
1232 return 0;
1233 }
1234
1235 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1236 {
1237 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1238 pr_err("dev[%p]: Unable to change SE Device"
1239 " optimal_sectors while dev_export_obj: %d count exists\n",
1240 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1241 return -EINVAL;
1242 }
1243 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1244 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1245 " changed for TCM/pSCSI\n", dev);
1246 return -EINVAL;
1247 }
1248 if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
1249 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1250 " greater than max_sectors: %u\n", dev,
1251 optimal_sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
1252 return -EINVAL;
1253 }
1254
1255 dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1256 pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1257 dev, optimal_sectors);
1258 return 0;
1259 }
1260
1261 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1262 {
1263 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1264 pr_err("dev[%p]: Unable to change SE Device block_size"
1265 " while dev_export_obj: %d count exists\n", dev,
1266 atomic_read(&dev->dev_export_obj.obj_access_count));
1267 return -EINVAL;
1268 }
1269
1270 if ((block_size != 512) &&
1271 (block_size != 1024) &&
1272 (block_size != 2048) &&
1273 (block_size != 4096)) {
1274 pr_err("dev[%p]: Illegal value for block_device: %u"
1275 " for SE device, must be 512, 1024, 2048 or 4096\n",
1276 dev, block_size);
1277 return -EINVAL;
1278 }
1279
1280 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1281 pr_err("dev[%p]: Not allowed to change block_size for"
1282 " Physical Device, use for Linux/SCSI to change"
1283 " block_size for underlying hardware\n", dev);
1284 return -EINVAL;
1285 }
1286
1287 dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1288 pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1289 dev, block_size);
1290 return 0;
1291 }
1292
1293 struct se_lun *core_dev_add_lun(
1294 struct se_portal_group *tpg,
1295 struct se_hba *hba,
1296 struct se_device *dev,
1297 u32 lun)
1298 {
1299 struct se_lun *lun_p;
1300 u32 lun_access = 0;
1301
1302 if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1303 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1304 atomic_read(&dev->dev_access_obj.obj_access_count));
1305 return NULL;
1306 }
1307
1308 lun_p = core_tpg_pre_addlun(tpg, lun);
1309 if ((IS_ERR(lun_p)) || !lun_p)
1310 return NULL;
1311
1312 if (dev->dev_flags & DF_READ_ONLY)
1313 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1314 else
1315 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1316
1317 if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1318 return NULL;
1319
1320 pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1321 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1322 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1323 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1324 /*
1325 * Update LUN maps for dynamically added initiators when
1326 * generate_node_acl is enabled.
1327 */
1328 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1329 struct se_node_acl *acl;
1330 spin_lock_irq(&tpg->acl_node_lock);
1331 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1332 if (acl->dynamic_node_acl &&
1333 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1334 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1335 spin_unlock_irq(&tpg->acl_node_lock);
1336 core_tpg_add_node_to_devs(acl, tpg);
1337 spin_lock_irq(&tpg->acl_node_lock);
1338 }
1339 }
1340 spin_unlock_irq(&tpg->acl_node_lock);
1341 }
1342
1343 return lun_p;
1344 }
1345
1346 /* core_dev_del_lun():
1347 *
1348 *
1349 */
1350 int core_dev_del_lun(
1351 struct se_portal_group *tpg,
1352 u32 unpacked_lun)
1353 {
1354 struct se_lun *lun;
1355 int ret = 0;
1356
1357 lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1358 if (!lun)
1359 return ret;
1360
1361 core_tpg_post_dellun(tpg, lun);
1362
1363 pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1364 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1365 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1366 tpg->se_tpg_tfo->get_fabric_name());
1367
1368 return 0;
1369 }
1370
1371 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1372 {
1373 struct se_lun *lun;
1374
1375 spin_lock(&tpg->tpg_lun_lock);
1376 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1377 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1378 "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1379 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1380 TRANSPORT_MAX_LUNS_PER_TPG-1,
1381 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1382 spin_unlock(&tpg->tpg_lun_lock);
1383 return NULL;
1384 }
1385 lun = &tpg->tpg_lun_list[unpacked_lun];
1386
1387 if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1388 pr_err("%s Logical Unit Number: %u is not free on"
1389 " Target Portal Group: %hu, ignoring request.\n",
1390 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1391 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1392 spin_unlock(&tpg->tpg_lun_lock);
1393 return NULL;
1394 }
1395 spin_unlock(&tpg->tpg_lun_lock);
1396
1397 return lun;
1398 }
1399
1400 /* core_dev_get_lun():
1401 *
1402 *
1403 */
1404 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1405 {
1406 struct se_lun *lun;
1407
1408 spin_lock(&tpg->tpg_lun_lock);
1409 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1410 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1411 "_TPG-1: %u for Target Portal Group: %hu\n",
1412 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1413 TRANSPORT_MAX_LUNS_PER_TPG-1,
1414 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1415 spin_unlock(&tpg->tpg_lun_lock);
1416 return NULL;
1417 }
1418 lun = &tpg->tpg_lun_list[unpacked_lun];
1419
1420 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1421 pr_err("%s Logical Unit Number: %u is not active on"
1422 " Target Portal Group: %hu, ignoring request.\n",
1423 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1424 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1425 spin_unlock(&tpg->tpg_lun_lock);
1426 return NULL;
1427 }
1428 spin_unlock(&tpg->tpg_lun_lock);
1429
1430 return lun;
1431 }
1432
1433 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1434 struct se_portal_group *tpg,
1435 u32 mapped_lun,
1436 char *initiatorname,
1437 int *ret)
1438 {
1439 struct se_lun_acl *lacl;
1440 struct se_node_acl *nacl;
1441
1442 if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1443 pr_err("%s InitiatorName exceeds maximum size.\n",
1444 tpg->se_tpg_tfo->get_fabric_name());
1445 *ret = -EOVERFLOW;
1446 return NULL;
1447 }
1448 nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1449 if (!nacl) {
1450 *ret = -EINVAL;
1451 return NULL;
1452 }
1453 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1454 if (!lacl) {
1455 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1456 *ret = -ENOMEM;
1457 return NULL;
1458 }
1459
1460 INIT_LIST_HEAD(&lacl->lacl_list);
1461 lacl->mapped_lun = mapped_lun;
1462 lacl->se_lun_nacl = nacl;
1463 snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1464
1465 return lacl;
1466 }
1467
1468 int core_dev_add_initiator_node_lun_acl(
1469 struct se_portal_group *tpg,
1470 struct se_lun_acl *lacl,
1471 u32 unpacked_lun,
1472 u32 lun_access)
1473 {
1474 struct se_lun *lun;
1475 struct se_node_acl *nacl;
1476
1477 lun = core_dev_get_lun(tpg, unpacked_lun);
1478 if (!lun) {
1479 pr_err("%s Logical Unit Number: %u is not active on"
1480 " Target Portal Group: %hu, ignoring request.\n",
1481 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1482 tpg->se_tpg_tfo->tpg_get_tag(tpg));
1483 return -EINVAL;
1484 }
1485
1486 nacl = lacl->se_lun_nacl;
1487 if (!nacl)
1488 return -EINVAL;
1489
1490 if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1491 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1492 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1493
1494 lacl->se_lun = lun;
1495
1496 if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1497 lun_access, nacl, tpg, 1) < 0)
1498 return -EINVAL;
1499
1500 spin_lock(&lun->lun_acl_lock);
1501 list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1502 atomic_inc(&lun->lun_acl_count);
1503 smp_mb__after_atomic_inc();
1504 spin_unlock(&lun->lun_acl_lock);
1505
1506 pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1507 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1508 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1509 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1510 lacl->initiatorname);
1511 /*
1512 * Check to see if there are any existing persistent reservation APTPL
1513 * pre-registrations that need to be enabled for this LUN ACL..
1514 */
1515 core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1516 return 0;
1517 }
1518
1519 /* core_dev_del_initiator_node_lun_acl():
1520 *
1521 *
1522 */
1523 int core_dev_del_initiator_node_lun_acl(
1524 struct se_portal_group *tpg,
1525 struct se_lun *lun,
1526 struct se_lun_acl *lacl)
1527 {
1528 struct se_node_acl *nacl;
1529
1530 nacl = lacl->se_lun_nacl;
1531 if (!nacl)
1532 return -EINVAL;
1533
1534 spin_lock(&lun->lun_acl_lock);
1535 list_del(&lacl->lacl_list);
1536 atomic_dec(&lun->lun_acl_count);
1537 smp_mb__after_atomic_dec();
1538 spin_unlock(&lun->lun_acl_lock);
1539
1540 core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1541 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1542
1543 lacl->se_lun = NULL;
1544
1545 pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1546 " InitiatorNode: %s Mapped LUN: %u\n",
1547 tpg->se_tpg_tfo->get_fabric_name(),
1548 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1549 lacl->initiatorname, lacl->mapped_lun);
1550
1551 return 0;
1552 }
1553
1554 void core_dev_free_initiator_node_lun_acl(
1555 struct se_portal_group *tpg,
1556 struct se_lun_acl *lacl)
1557 {
1558 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1559 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1560 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1561 tpg->se_tpg_tfo->get_fabric_name(),
1562 lacl->initiatorname, lacl->mapped_lun);
1563
1564 kfree(lacl);
1565 }
1566
1567 int core_dev_setup_virtual_lun0(void)
1568 {
1569 struct se_hba *hba;
1570 struct se_device *dev;
1571 struct se_subsystem_dev *se_dev = NULL;
1572 struct se_subsystem_api *t;
1573 char buf[16];
1574 int ret;
1575
1576 hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1577 if (IS_ERR(hba))
1578 return PTR_ERR(hba);
1579
1580 lun0_hba = hba;
1581 t = hba->transport;
1582
1583 se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1584 if (!se_dev) {
1585 pr_err("Unable to allocate memory for"
1586 " struct se_subsystem_dev\n");
1587 ret = -ENOMEM;
1588 goto out;
1589 }
1590 INIT_LIST_HEAD(&se_dev->se_dev_node);
1591 INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1592 spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1593 INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1594 INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1595 spin_lock_init(&se_dev->t10_pr.registration_lock);
1596 spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1597 INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1598 spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1599 spin_lock_init(&se_dev->se_dev_lock);
1600 se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1601 se_dev->t10_wwn.t10_sub_dev = se_dev;
1602 se_dev->t10_alua.t10_sub_dev = se_dev;
1603 se_dev->se_dev_attrib.da_sub_dev = se_dev;
1604 se_dev->se_dev_hba = hba;
1605
1606 se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1607 if (!se_dev->se_dev_su_ptr) {
1608 pr_err("Unable to locate subsystem dependent pointer"
1609 " from allocate_virtdevice()\n");
1610 ret = -ENOMEM;
1611 goto out;
1612 }
1613 lun0_su_dev = se_dev;
1614
1615 memset(buf, 0, 16);
1616 sprintf(buf, "rd_pages=8");
1617 t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1618
1619 dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1620 if (IS_ERR(dev)) {
1621 ret = PTR_ERR(dev);
1622 goto out;
1623 }
1624 se_dev->se_dev_ptr = dev;
1625 g_lun0_dev = dev;
1626
1627 return 0;
1628 out:
1629 lun0_su_dev = NULL;
1630 kfree(se_dev);
1631 if (lun0_hba) {
1632 core_delete_hba(lun0_hba);
1633 lun0_hba = NULL;
1634 }
1635 return ret;
1636 }
1637
1638
1639 void core_dev_release_virtual_lun0(void)
1640 {
1641 struct se_hba *hba = lun0_hba;
1642 struct se_subsystem_dev *su_dev = lun0_su_dev;
1643
1644 if (!hba)
1645 return;
1646
1647 if (g_lun0_dev)
1648 se_free_virtual_device(g_lun0_dev, hba);
1649
1650 kfree(su_dev);
1651 core_delete_hba(hba);
1652 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree